.courses-container{width:100%;padding-bottom:50px}.courses-header{text-align:center}.courses-header h1{font-size:clamp(1.75rem, 3vw, 2.5rem);margin-bottom:.5rem;color:var(--text-primary)}.courses-header p{font-size:clamp(1rem, 1.5vw, 1.25rem);color:var(--text-secondary);max-width:700px;margin:0 auto;line-height:1.6}.courses-login-nudge{display:inline-flex;align-items:center;gap:.4rem;margin-top:.85rem;padding:0;background:0 0;border:none;cursor:pointer;font-size:.9rem;font-weight:500;color:var(--text-tertiary-color);transition:color var(--dur-fast) var(--ease-out)}.courses-login-nudge i,.courses-login-nudge svg{width:.95em;height:.95em;transition:transform var(--dur-fast) var(--ease-out)}.courses-login-nudge:hover{color:var(--text-primary-color)}.courses-login-nudge:hover i,.courses-login-nudge:hover svg{transform:translateX(2px)}.courses-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(275px,1fr));gap:var(--spacing-md);margin-top:3rem}.course-card{background:var(--card-bg);border-radius:var(--radius-md);corner-shape:squircle;overflow:hidden;display:flex;flex-direction:column;height:100%;min-height:400px;position:relative;box-shadow:var(--card-shadow)}.course-thumbnail{width:100%;height:180px;object-fit:cover;background-color:var(--border-color);background-image:linear-gradient(135deg,var(--sidebar-background) 25%,var(--border-color) 25%,var(--border-color) 50%,var(--sidebar-background) 50%,var(--sidebar-background) 75%,var(--border-color) 75%,var(--border-color) 100%);background-size:20px 20px;position:relative}.course-body{padding:var(--spacing-md);display:flex;flex-direction:column;flex-grow:1}.course-title{font-size:var(--text-xl);line-height:1.4;margin-bottom:var(--spacing-sm);color:var(--text-primary);font-weight:600;font-family:Geist,sans-serif}.course-meta{display:flex;flex-wrap:wrap;align-items:center;gap:var(--spacing-md);margin-bottom:var(--spacing-sm);font-size:.9375rem;color:var(--text-secondary)}.course-meta-item{display:flex;align-items:center;gap:.35rem}.meta-icon{width:1rem;height:1rem;stroke-width:var(--stroke-width);flex-shrink:0;opacity:.8}.course-description{font-size:var(--text-sm);line-height:1.6;color:var(--text-secondary);margin-bottom:var(--spacing-md);flex-grow:1}.course-footer{display:flex;flex-direction:column;gap:var(--spacing-sm);margin-top:auto}.circular-progress{position:relative;width:1.1rem;height:1.1rem;display:flex;align-items:center;justify-content:center}.circular-progress-svg{width:100%;height:100%;transform:rotate(-90deg)}.circular-progress-bg{stroke:var(--progress-ring-bg);fill:none;stroke-width:5}.circular-progress-fill{stroke:var(--primary-color);fill:none;stroke-width:5;stroke-linecap:round;transition:stroke-dasharray .6s cubic-bezier(.16, 1, .3, 1)}.course-actions{display:flex;gap:var(--spacing-xs);flex-direction:column}.course-actions .bttn{width:100%}.course-card .course-hover-overlay{display:none}.course-enrollment-status{position:absolute;top:var(--spacing-sm);right:var(--spacing-sm);padding:.4rem .7rem;border-radius:var(--radius-sm);corner-shape:squircle;font-size:var(--text-sm);font-weight:500;text-transform:capitalize;z-index:2;display:flex;align-items:center;gap:.3rem;color:var(--text-primary-color);background:rgba(255,255,255,.6);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);border:1px solid var(--shadow-border);box-shadow:0 1px 3px rgba(0,0,0,.08)}[data-theme=dark] .course-enrollment-status{background:rgba(28,28,28,.6)}.course-enrollment-status.enrolled::before{content:'';width:7px;height:7px;border-radius:50%;background:var(--active-green);flex-shrink:0}.course-enrollment-status.not-enrolled{color:var(--text-secondary-color)}.course-enrollment-status.not-enrolled i{width:1rem;height:1rem;stroke-width:2}.course-stats{display:flex;gap:var(--spacing-md);margin-bottom:var(--spacing-md)}.course-stat{display:flex;flex-direction:column;align-items:center}.course-stat-value{font-size:1.25rem;font-weight:500;color:var(--text-primary)}.course-stat-label{font-size:.75rem;color:var(--text-secondary)}.courses-empty{padding:var(--spacing-lg);text-align:center;background-color:var(--sidebar-background);border-radius:var(--radius-md);corner-shape:squircle;border:1px solid var(--border-color)}.courses-empty h2{margin-bottom:var(--spacing-sm);color:var(--text-primary)}.courses-empty p{margin-bottom:var(--spacing-md);color:var(--text-secondary)}.courses-controls{display:flex;align-items:center;justify-content:space-between;margin-bottom:var(--spacing-md);flex-wrap:wrap;gap:var(--spacing-sm)}.courses-search{position:relative;min-width:240px;flex-grow:1}.courses-search input{width:100%;padding:.75rem 1rem .75rem 2.5rem;border-radius:var(--radius-sm);corner-shape:squircle;border:1px solid var(--border-color);background-color:var(--background-color);color:var(--text-primary)}.courses-search i{position:absolute;left:.75rem;top:50%;transform:translateY(-50%);color:var(--text-secondary)}.courses-filters{display:flex;gap:var(--spacing-sm)}.courses-sort-dropdown{position:relative;min-width:200px}.courses-sticky-footer{position:fixed;bottom:0;left:0;right:0;border-top:1px solid var(--border-color);padding:1rem;text-align:center;font-size:.875rem;color:var(--text-tertiary-color);height:50px;display:flex;align-items:center;justify-content:center;backdrop-filter:blur(8px);z-index:10}.courses-sticky-footer a{text-decoration:none}.courses-sticky-footer .separator{margin:0 1rem}.educator-phrase{white-space:nowrap}.educators-shine{margin-right:4px;position:relative;display:inline-block;color:transparent;background-clip:text;-webkit-background-clip:text;background-image:linear-gradient(75deg,#8c8c8c 30%,#fff 50%,#8c8c8c 70%);background-size:200%;animation:shine-text 6s linear infinite;font-weight:500}@keyframes shine-text{0%{background-position:150%}20%{background-position:-50%}100%{background-position:-50%}}@media (max-width:768px){.courses-grid{grid-template-columns:repeat(auto-fill,minmax(275px,1fr))}.courses-header{text-align:left}.courses-controls{flex-direction:column;align-items:stretch}.courses-sticky-footer{font-size:.75rem;padding:.5rem;flex-wrap:wrap;line-height:1.4}.courses-sticky-footer .separator{margin:0 .5rem}}[data-theme=dark] .course-status{background-color:rgba(255,255,255,.1)}[data-theme=dark] .course-status.draft{color:rgba(255,255,255,.8)}[data-theme=dark] .course-thumbnail{background-image:linear-gradient(135deg,rgba(255,255,255,.03) 25%,rgba(255,255,255,.07) 25%,rgba(255,255,255,.07) 50%,rgba(255,255,255,.03) 50%,rgba(255,255,255,.03) 75%,rgba(255,255,255,.07) 75%,rgba(255,255,255,.07) 100%)}.access-error-container{display:flex;align-items:center;justify-content:center;min-height:400px;padding:var(--spacing-lg) var(--spacing-md);width:100%}.access-error-content{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:1rem;text-align:center;max-width:500px;width:100%;border-radius:var(--radius-md);corner-shape:squircle;padding:1.5rem;box-shadow:0 0 0 1px var(--input-border-color)}.access-error-content .error-icon,.error-content .error-icon{display:flex;align-items:center;justify-content:center}.access-error-content .error-icon i,.error-content .error-icon i{width:64px;height:64px;stroke-width:1.5}.access-error-content .error-message,.error-content .error-message{color:var(--text-secondary-color);margin:0 0 var(--spacing-md) 0;line-height:1.5}.access-error-content .error-actions,.error-content .error-actions{display:flex;gap:var(--spacing-xs);justify-content:center;flex-wrap:wrap}.error-container{display:flex;align-items:center;justify-content:center;min-height:400px;padding:var(--spacing-lg) var(--spacing-md);width:100%}.error-content{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:1rem;text-align:center;max-width:500px;width:100%;border-radius:var(--radius-md);corner-shape:squircle;padding:1.5rem;box-shadow:0 0 0 1px var(--input-border-color)}.error-message{text-align:center;max-width:500px;margin:0 auto;padding:0;color:var(--error-color)}.nav-access-message{display:flex;align-items:center;justify-content:center;min-height:200px;padding:var(--spacing-lg);text-align:center}.nav-access-message p{font-size:var(--text-base);color:var(--text-secondary-color);margin:0;line-height:1.5}.error-message p{font-size:var(--text-lg)}.error-message details{margin:var(--spacing-md) 0;text-align:left;max-width:100%}.error-message details summary{cursor:pointer;padding:var(--spacing-xs) var(--spacing-sm);background:var(--input-bg);border-radius:var(--bttn-radius);font-size:var(--text-sm);color:var(--text-tertiary-color);transition:background-color var(--transition-speed) var(--transition-ease)}.error-message details summary:hover{background:var(--hover-100)}.error-message details pre{margin-top:var(--spacing-xs);padding:var(--spacing-sm);background:var(--input-bg);border-radius:var(--bttn-radius);font-size:var(--text-xs);overflow-x:auto;color:var(--text-tertiary-color);border:1px solid var(--input-border-color)}.inline-error-message{display:flex;align-items:center;gap:var(--spacing-xs);padding:var(--spacing-sm) var(--spacing-md);margin-bottom:var(--spacing-sm);border-radius:var(--bttn-radius);font-size:var(--text-sm);line-height:1.5;border:1px solid var(--input-border-color)}.inline-error-message i{width:18px;height:18px;flex-shrink:0}.inline-error-error{background:var(--bg-color);color:var(--text-primary-color);border-color:var(--input-border-color)}.inline-error-warning{background:var(--bg-color);color:var(--text-primary-color);border-color:var(--input-border-color)}.inline-error-info{background:var(--bg-color);color:var(--text-primary-color);border-color:var(--input-border-color)}@media (max-width:768px){.access-error-container,.error-container{padding:var(--spacing-md) var(--spacing-sm)}.access-error-content,.error-content{padding:var(--spacing-md)}.access-error-content .error-icon,.error-content .error-icon{font-size:48px}.access-error-content .error-icon i,.error-content .error-icon i{width:48px;height:48px}.error-actions{flex-direction:column;width:100%}.error-actions .bttn{width:100%}}:root.font-small{font-size:14.5px}:root.font-normal{font-size:16px}:root.font-large{font-size:17.5px}:root.font-larger{font-size:19.5px}:root{transition:font-size .3s ease}*{transition:font-size .3s ease}:root.font-small .skeleton{min-height:8px}:root.font-xl .skeleton{max-height:32px}@media (max-width:768px){:root.font-large{font-size:17px}:root.font-xl{font-size:19px}}@media (max-width:480px){:root.font-large{font-size:16px}:root.font-xl{font-size:18px}}#course-view-container>.nn-hdr{height:var(--header-height);border-bottom:1px solid var(--border-soft);z-index:110}#course-view-container>.nn-hdr.nn-hdr--menu-open{z-index:230}#course-view-container>.nn-hdr>.nn-hdr-inner{height:100%;padding-block:0}.nn-hdr .nn-hdr-end :is(#gift-course-btn,#my-learning-btn).bttn-icon{width:34px!important;height:34px!important;flex:none}.nn-hdr .nn-hdr-end #gift-course-btn{margin-right:-7px}.nn-hdr #gift-course-btn svg{overflow:visible}.nn-hdr #gift-course-btn :is(.cm-gift-box,.cm-gift-lid){transform-box:fill-box;transform-origin:50% 100%}@media (prefers-reduced-motion:no-preference){.nn-hdr #gift-course-btn .cm-gift-box{animation:cm-gift-box 1s cubic-bezier(.3,.7,.4,1) .4s both}.nn-hdr #gift-course-btn .cm-gift-lid{animation:cm-gift-lid 1s cubic-bezier(.3,.7,.4,1) .4s both}}@keyframes cm-gift-box{0%{transform:translateY(-10px)}30%{transform:translateY(0) scaleY(.86)}46%{transform:translateY(-1.5px) scaleY(1.04)}100%,62%{transform:none}}@keyframes cm-gift-lid{0%{transform:translateY(-10px)}30%{transform:translateY(1.4px)}52%{transform:translateY(-5px) rotate(-14deg)}74%{transform:translateY(0) rotate(4deg)}88%{transform:translateY(-.5px) rotate(-1deg)}100%{transform:none}}.lesson-preview{--lp-accent:var(--brand-color, #0072ff);--lp-accent-soft:color-mix(in srgb, var(--lp-accent) 9%, transparent);--lp-frame-a:color-mix(in srgb, var(--lp-accent) 16%, #f4f7fb);--lp-frame-b:#eef1f5;--lp-frame-line:rgba(20, 30, 50, 0.08);max-width:920px;margin:0 auto;padding:2.5rem var(--spacing-lg) 4rem;box-sizing:border-box}[data-theme=dark] .lesson-preview{--lp-accent-soft:color-mix(in srgb, var(--lp-accent) 18%, transparent);--lp-frame-a:color-mix(in srgb, var(--lp-accent) 22%, #161a20);--lp-frame-b:#141414;--lp-frame-line:rgba(255, 255, 255, 0.07)}.lesson-preview .lp-head{margin-bottom:var(--spacing-lg)}.lesson-preview .lp-eyebrow{margin:0 0 .6rem;font-size:var(--text-sm);font-weight:500;letter-spacing:var(--ls-lg);text-transform:uppercase;color:var(--text-tertiary-color)}.lesson-preview .lp-title{display:flex;align-items:flex-start;gap:.6rem;margin:0;font-size:var(--text-xxl);line-height:1.2;letter-spacing:var(--ls-base);color:var(--text-primary);text-wrap:balance}.lesson-preview .lp-title-icon{display:flex;flex-shrink:0;align-items:center;height:1.2em;height:1lh;color:var(--text-secondary)}.lesson-preview .lp-title-icon svg{display:block;width:.9em;height:.9em}.lesson-preview .lp-desc{max-width:680px;margin:.85rem 0 0;font-size:var(--text-base);line-height:1.65;color:var(--text-secondary)}.lesson-preview .lp-locked{display:grid;grid-template-columns:minmax(0,1.3fr) minmax(0,1fr);gap:var(--spacing-md);align-items:center;padding:var(--spacing-sm);background:var(--card-bg);box-shadow:var(--card-shadow);border-radius:var(--radius-lg);corner-shape:squircle}.lesson-preview .lp-frame{position:relative;display:flex;align-items:center;justify-content:center;aspect-ratio:16/9;overflow:hidden;background:radial-gradient(120% 90% at 20% 10%,var(--lp-frame-a) 0,transparent 60%),radial-gradient(90% 90% at 100% 100%,color-mix(in srgb,var(--lp-accent) 10%,transparent) 0,transparent 70%),var(--lp-frame-b);border-radius:var(--radius-md);corner-shape:squircle}.lesson-preview .lp-frame.has-thumb{background:#0b0d12}.lesson-preview .lp-frame-thumb{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;filter:blur(1.5px) brightness(.74) saturate(.75) contrast(1.08);transform:scale(1.05)}.lesson-preview .lp-frame-wash{position:absolute;inset:0;background:radial-gradient(120% 95% at 50% 45%,rgba(8,10,16,0) 40%,rgba(8,10,16,.55) 100%),linear-gradient(to top,rgba(6,8,12,.72) 0,rgba(6,8,12,0) 38%),linear-gradient(to bottom,rgba(6,8,12,.45) 0,rgba(6,8,12,0) 28%),linear-gradient(135deg,color-mix(in srgb,var(--lp-accent) 14%,transparent) 0,transparent 55%)}.lesson-preview .lp-frame-lines{position:absolute;inset:auto 8% 14% 8%;display:flex;flex-direction:column;gap:9px;filter:blur(1.5px)}.lesson-preview .lp-frame-lines span{display:block;height:9px;border-radius:999px;background:var(--lp-frame-line)}.lesson-preview .lp-frame-lines span:first-child{width:72%}.lesson-preview .lp-frame-lines span:nth-child(2){width:88%}.lesson-preview .lp-frame-lines span:nth-child(3){width:54%}.lesson-preview .lp-frame[data-type=video] .lp-frame-lines{inset:auto 6% 9% 6%}.lesson-preview .lp-frame[data-type=video] .lp-frame-lines span{height:4px}.lesson-preview .lp-frame[data-type=video] .lp-frame-lines span:first-child{width:100%;background:linear-gradient(90deg,var(--lp-accent) 0 8%,var(--lp-frame-line) 8%)}.lesson-preview .lp-frame[data-type=video] .lp-frame-lines span:nth-child(n+2){display:none}.lesson-preview .lp-frame.has-thumb .lp-frame-lines{filter:none}.lesson-preview .lp-frame.has-thumb .lp-frame-lines span{background:rgba(255,255,255,.28)}.lesson-preview .lp-frame.has-thumb[data-type=video] .lp-frame-lines span:first-child{background:linear-gradient(90deg,var(--lp-accent) 0 8%,rgba(255,255,255,.28) 8%)}.lesson-preview .lp-frame.has-thumb .lp-frame-icon{box-shadow:0 0 0 6px rgba(255,255,255,.08),0 14px 34px -8px rgba(0,0,0,.7)}.lesson-preview .lp-frame.has-thumb .lp-frame-lock{background:#fff;color:#111}.lesson-preview .lp-frame.has-thumb .lp-frame-chip{background:rgba(0,0,0,.55);box-shadow:inset 0 0 0 1px rgba(255,255,255,.14);backdrop-filter:blur(6px)}.lesson-preview .lp-frame-icon{position:relative;display:flex;align-items:center;justify-content:center;width:76px;height:76px;border-radius:50%;background:var(--lp-accent);color:#fff;box-shadow:0 10px 30px -8px color-mix(in srgb,var(--lp-accent) 60%,transparent)}.lesson-preview .lp-frame-icon>svg{width:32px;height:32px}.lesson-preview .lp-frame[data-type=video] .lp-frame-icon>svg{margin-left:4px}.lesson-preview .lp-frame-lock{position:absolute;right:-4px;bottom:-4px;display:flex;align-items:center;justify-content:center;width:30px;height:30px;border-radius:50%;background:var(--bg-color);color:var(--text-primary);box-shadow:0 2px 8px rgba(0,0,0,.18)}.lesson-preview .lp-frame-lock svg{width:15px;height:15px}.lesson-preview .lp-frame-chip{position:absolute;right:12px;top:12px;padding:.2rem .55rem;border-radius:999px;background:rgba(0,0,0,.62);color:#fff;font-size:var(--text-xs);font-weight:600;font-variant-numeric:tabular-nums}.lesson-preview .lp-pitch{padding:var(--spacing-xs) var(--spacing-sm) var(--spacing-xs) 0}.lesson-preview .lp-locked-note{display:inline-flex;align-items:center;gap:.35rem;font-size:var(--text-xs);font-weight:600;letter-spacing:var(--ls-lg);text-transform:uppercase;color:var(--lp-accent)}.lesson-preview .lp-locked-note svg{width:14px;height:14px}.lesson-preview .lp-pitch-title{margin:.5rem 0 0;font-size:var(--text-xl);line-height:1.25;color:var(--text-primary);text-wrap:balance}.lesson-preview .lp-pitch-body{margin:.6rem 0 0;font-size:var(--text-base);line-height:1.6;color:var(--text-secondary)}.lesson-preview .lp-actions{display:flex;flex-direction:column;align-items:flex-start;gap:.6rem;margin-top:var(--spacing-md)}.lesson-preview .lp-actions.is-centered{align-items:center}.lesson-preview a.lp-enroll{display:inline-flex;align-items:center;gap:.5rem;font-size:var(--text-md);text-decoration:none}.lesson-preview a.lp-enroll svg{width:18px;height:18px;transition:transform var(--dur-fast) var(--ease-out)}.lesson-preview a.lp-enroll:hover svg{transform:translateX(2px)}.lesson-preview .lp-login-line{margin:0;font-size:var(--text-sm);color:var(--text-secondary)}.lesson-preview .lp-login{padding:0;border:0;background:0 0;color:var(--lp-accent);font:inherit;font-weight:600;cursor:pointer}.lesson-preview .lp-login:hover{text-decoration:underline}.lesson-preview .lp-login:focus-visible{outline:2px solid var(--lp-accent);outline-offset:2px;border-radius:4px}.lesson-preview .lp-section{margin-top:2.75rem}.lesson-preview .lp-unit-head{display:flex;align-items:center;gap:var(--spacing-sm);margin-bottom:var(--spacing-sm)}.lesson-preview .lp-unit-icon{display:flex;flex-shrink:0;color:var(--text-secondary)}.lesson-preview .lp-unit-icon .module-anim svg{width:36px;height:36px}.lesson-preview .lp-section-title{margin:0;font-size:var(--text-lg);font-weight:400;letter-spacing:var(--ls-base);color:var(--text-tertiary-color)}.lesson-preview .lp-section-note{margin:.2rem 0 0;font-size:var(--text-sm);color:var(--text-secondary)}.lesson-preview .lp-course .lp-section-note{margin-bottom:var(--spacing-sm)}.lesson-preview .lp-lessons{margin:0;padding:0;list-style:none}.lesson-preview .lp-lessons>li::before{content:none}.lesson-preview .lp-lesson{display:flex;align-items:center;gap:.85rem;margin:0;padding:.85rem .25rem;border-bottom:1px solid var(--border-color);color:var(--text-primary)}.lesson-preview .lp-lesson-icon{display:flex;flex-shrink:0;color:var(--text-secondary)}.lesson-preview .lp-lesson-icon svg{width:18px;height:18px}.lesson-preview .lp-lesson-text{display:flex;flex:1;flex-direction:column;min-width:0}.lesson-preview .lp-lesson-title{font-size:var(--text-base);font-weight:500;line-height:1.35;overflow-wrap:anywhere}.lesson-preview .lp-lesson-meta{font-size:var(--text-sm);color:var(--text-tertiary-color)}.lesson-preview .lp-lesson-lock{display:flex;flex-shrink:0;color:var(--text-tertiary-color)}.lesson-preview .lp-lesson-lock svg{width:16px;height:16px}.lesson-preview .lp-lesson-number{color:var(--text-tertiary-color);font-weight:500;font-variant-numeric:tabular-nums}.lesson-preview .lp-lesson-tag{flex-shrink:0;font-size:var(--text-xs);font-weight:600;letter-spacing:var(--ls-lg);text-transform:uppercase;color:var(--text-secondary);white-space:nowrap}.lesson-preview .lp-lesson.lp-gap{padding:.7rem .25rem;font-size:var(--text-sm);color:var(--text-tertiary-color)}.lesson-preview .lp-gap-dots{display:inline-flex;flex-shrink:0;width:18px;justify-content:center;letter-spacing:.05em}.lesson-preview .lp-stats{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:var(--spacing-sm)}.lesson-preview .lp-stat{display:flex;flex-direction:column;gap:.35rem;padding:var(--spacing-md);background:var(--card-bg);box-shadow:var(--card-shadow);border-radius:var(--radius-md);corner-shape:squircle}.lesson-preview .lp-stat-icon{display:flex;margin-bottom:.3rem;color:var(--lp-accent)}.lesson-preview .lp-stat-icon svg{width:22px;height:22px}.lesson-preview .lp-stat-head{color:var(--text-primary);line-height:1.25}.lesson-preview .lp-stat-value{font-size:var(--text-xl);font-weight:600;font-variant-numeric:tabular-nums}.lesson-preview .lp-stat-value.is-word{font-size:var(--text-lg)}.lesson-preview .lp-stat-label{font-size:var(--text-base);font-weight:500;color:var(--text-secondary)}.lesson-preview .lp-stat-text{font-size:var(--text-sm);line-height:1.5;color:var(--text-secondary)}.lesson-preview .lp-final{margin-top:3rem;padding:var(--spacing-lg) var(--spacing-md);text-align:center;background:var(--lp-accent-soft);border-radius:var(--radius-lg);corner-shape:squircle}.lesson-preview .lp-final-title{margin:0;font-size:var(--text-xl);line-height:1.25;color:var(--text-primary);text-wrap:balance}.lesson-preview .lp-final-body{max-width:520px;margin:.5rem auto 0;font-size:var(--text-base);line-height:1.6;color:var(--text-secondary)}@media (max-width:820px){.lesson-preview .lp-locked{grid-template-columns:1fr}.lesson-preview .lp-pitch{padding:0 var(--spacing-xs) var(--spacing-xs)}}@media (max-width:768px){.lesson-preview{padding:1.5rem var(--spacing-sm) 3rem}.lesson-preview .lp-title{font-size:var(--text-xl)}.lesson-preview .lp-final-title,.lesson-preview .lp-pitch-title{font-size:var(--text-lg)}.lesson-preview .lp-actions,.lesson-preview .lp-actions.is-centered{align-items:stretch;text-align:center}.lesson-preview a.lp-enroll{justify-content:center}.lesson-preview .lp-frame-icon{width:60px;height:60px}.lesson-preview .lp-frame-icon>svg{width:26px;height:26px}.lesson-preview .lp-lesson{gap:.7rem}.lesson-preview .lp-stats{grid-template-columns:1fr}.lesson-preview .lp-stat{padding:var(--spacing-sm)}.lesson-preview .lp-final{padding:var(--spacing-md) var(--spacing-sm)}}:root{--primary-color:var(--brand-color);--secondary-color:var(--text-secondary-color);--background-color:var(--bg-color);--bg-muted-color:#fbfbfb;--sidebar-bg:#f8fafc;--sidebar-bg-rgb:248,250,252;--border-color:var(--input-border-color);--text-primary:var(--text-primary-color);--text-secondary:var(--text-secondary-color);--success-color:var(--active-green);--active-red:#ee1c1c;--active-yellow:#f3a31a;--highlight-color:0,191,255;--shadow-border:rgba(0, 0, 0, 0.1);--bttn-radius:999px;--card-shadow:rgba(14, 63, 126, 0.06) 0px 0px 0px 1px,rgba(42, 51, 70, 0.03) 0px 1px 1px -0.5px,rgba(42, 51, 70, 0.04) 0px 2px 2px -1px,rgba(42, 51, 70, 0.04) 0px 3px 3px -1.5px,rgba(42, 51, 70, 0.03) 0px 5px 5px -2.5px,rgba(42, 51, 70, 0.03) 0px 10px 10px -5px,rgba(42, 51, 70, 0.03) 0px 24px 24px -8px;--card-bg:radial-gradient(130% 120% at 100% 0%, #fcfcfc 0%, #f9f9f9 75%);--sq-mult:1;--radius-xs:calc(16px * var(--sq-mult));--radius-sm:calc(20px * var(--sq-mult));--radius-md:calc(24px * var(--sq-mult));--radius-lg:calc(28px * var(--sq-mult));--dur-fast:120ms;--dur-base:200ms;--dur-slow:320ms;--ease-out:cubic-bezier(0.22, 1, 0.36, 1);--ease-out-soft:cubic-bezier(0.16, 1, 0.3, 1);--ease-in-out:cubic-bezier(0.65, 0, 0.35, 1);--header-height:70px;--sidebar-width:300px;--spacing-xs:0.5rem;--spacing-sm:1rem;--spacing-md:1.5rem;--spacing-lg:2rem;--control-bar-height:60px;--scrollbar-thumb:rgba(20, 30, 50, 0.22);--scrollbar-thumb-hover:rgba(20, 30, 50, 0.42);--skeleton-base:#e4eaeb;--skeleton-highlight:#e9ecef;--skeleton-shimmer:#d3dbdb;--skeleton-overlay:rgba(240, 244, 246, 0.8);--content-bg:var(--bg-color);--control-bar-bg:var(--bg-color);--breadcrumb-bg:var(--sidebar-bg);--breadcrumb-bg-rgb:248,250,252;--breadcrumb-text:#64748b;--breadcrumb-text-active:#334155;--breadcrumb-border:var(--border-color);--article-problem-bg:color-mix(in srgb, #f3e8ff 40%, white);--article-problem-text:#6b21a8;--article-problem-border:color-mix(in srgb, #c4b5fd 40%, transparent);--article-problem-accent:#8b5cf6;--article-formula-bg:color-mix(in srgb, #ecfeff 40%, white);--article-formula-text:#155e75;--article-formula-border:color-mix(in srgb, #67e8f9 60%, transparent);--article-formula-accent:#22d3ee;--article-concept-bg:#FFEBA1;--article-concept-text:#464f5d;--article-notice-bg:color-mix(in srgb, var(--brand-color) 4%, transparent);--article-notice-text:var(--brand-color);--article-notice-border:color-mix(in srgb, var(--brand-color) 30%, transparent);--article-notice-accent:var(--brand-color);--progress-ring-stroke:rgb(80, 80, 80);--progress-ring-bg:rgba(160, 160, 160, 0.5)}[data-theme=dark]{--content-bg:var(--bg-color);--sidebar-bg:rgb(25, 25, 25);--sidebar-bg-rgb:25,25,25;--bg-muted-color:#151515;--control-bar-bg:var(--bg-color);--highlight-color:0,191,255;--shadow-border:rgba(255, 255, 255, 0.1);--scrollbar-thumb:rgba(255, 255, 255, 0.18);--scrollbar-thumb-hover:rgba(255, 255, 255, 0.34);--card-shadow:inset 0 0 0 1px rgba(255, 255, 255, 0.06),rgba(0, 0, 0, 0.4) 0px 1px 1px -0.5px,rgba(0, 0, 0, 0.4) 0px 2px 2px -1px,rgba(0, 0, 0, 0.4) 0px 3px 3px -1.5px,rgba(0, 0, 0, 0.35) 0px 5px 5px -2.5px,rgba(0, 0, 0, 0.35) 0px 10px 10px -5px,rgba(0, 0, 0, 0.3) 0px 24px 24px -8px;--card-bg:radial-gradient(130% 120% at 100% 0%, #1f1f1f 0%, #171717 75%);--nav-hover-bg:rgba(255, 255, 255, 0.1);--nav-active-bg:rgba(0, 114, 255, 0.2);--nav-active-border:rgba(0, 114, 255, 0.4);--breadcrumb-bg:var(--sidebar-bg);--breadcrumb-bg-rgb:25,25,25;--breadcrumb-text:#94a3b8;--breadcrumb-text-active:#e2e8f0;--breadcrumb-border:var(--border-color);--article-problem-bg:rgba(139, 92, 246, 0.03);--article-problem-text:#f2efff;--article-formula-bg:rgba(56, 189, 248, 0.03);--article-formula-text:#67e8f9;--article-formula-border:rgba(56, 189, 248, 0.25);--article-concept-bg:#FFEBA1;--article-concept-text:#374151;--article-notice-bg:color-mix(in srgb, var(--brand-color) 3%, transparent);--article-notice-text:color-mix(in srgb, var(--brand-color) 80%, white);--article-notice-border:color-mix(in srgb, var(--brand-color) 60%, transparent);--article-notice-accent:var(--brand-color);--progress-ring-stroke:#ffffff;--progress-ring-bg:rgba(255, 255, 255, 0.2);--skeleton-base:#2a2a2a;--skeleton-highlight:#404040;--skeleton-shimmer:#4a4a4a;--skeleton-overlay:rgba(255, 255, 255, 0.1)}*{margin:0;padding:0;box-sizing:border-box}body,html{height:100%;font-family:system-ui,-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,Oxygen,Ubuntu,Cantarell,'Open Sans','Helvetica Neue',sans-serif;background-color:var(--background-color);overflow:hidden}#course-view-container{height:100%;display:grid;grid-template-rows:var(--header-height) 1fr var(--control-bar-height,60px);grid-template-areas:"header" "main" "controls";overflow:hidden}#main-layout{display:grid;--col-left:var(--sidebar-width);--col-right:var(--sidebar-width);grid-template-columns:var(--col-left) 1fr var(--col-right);grid-template-areas:"left-sidebar content right-sidebar";height:100%;overflow:hidden;position:relative}#main-layout.left-collapsed{--col-left:0}#main-layout.right-collapsed{--col-right:0}#main-layout.sidebar-animating{transition:grid-template-columns .35s var(--ease-in-out, ease-in-out)}#main-layout.content-only{grid-template-columns:1fr!important;grid-template-areas:"content"!important}#main-layout.content-only #left-sidebar,#main-layout.content-only #right-sidebar{display:none!important;width:0!important;min-width:0!important;padding:0!important;margin:0!important;border:none!important}body.content-only-layout #bottom-control-bar{display:none!important}body.content-only-layout #course-view-container{grid-template-rows:var(--header-height) 1fr;grid-template-areas:"header" "main"}body.content-only-layout #main-layout{height:100%}#left-sidebar.collapsed{padding-left:0;padding-right:0;border:none}#content-area{grid-area:content;overflow-y:auto;padding:0;background-color:var(--content-bg);min-width:0;min-height:0;width:100%;margin:0;display:block;position:relative;z-index:1;scroll-behavior:smooth;overscroll-behavior-y:contain}#main-layout.content-only #content-area{width:100%!important;min-width:0!important;margin:0!important}#main-layout.left-collapsed #content-area{margin-left:0}#main-layout.right-collapsed #content-area{margin-right:0}body.resizing{cursor:col-resize!important;-webkit-user-select:none;user-select:none}.sidebar.collapsed .sidebar-resize-handle{display:none}#lesson-content{display:block;max-width:1325px;padding:1.5rem;min-height:200px;width:100%;box-sizing:border-box;margin:0 auto}@media (max-width:1400px){#lesson-content{max-width:1200px}}@media (max-width:1200px){#lesson-content{max-width:1000px}}@media (max-width:1000px){#lesson-content{max-width:900px}}@media (max-width:900px){#lesson-content{max-width:100%;padding:3% 6%}}@media (max-width:768px){#lesson-content{padding:1.5rem}}.lesson-content{max-width:700px;width:100%;display:block}#main-layout.left-collapsed .lesson-content{margin:0 auto!important}.notes-placeholder{color:var(--text-secondary);font-style:italic;text-align:center;padding:calc(var(--spacing-md) + 20px)}.loading{opacity:.6;pointer-events:none}.fade-in{animation:fadeIn .3s ease-in}[data-theme=dark] .image-lightbox img,[data-theme=dark] .lesson-content-container img,[data-theme=dark] .lesson-practice-container img{filter:invert(1) hue-rotate(180deg)}[data-theme=dark] .nav-lesson:hover{background:var(--nav-hover-bg)}[data-theme=dark] .nav-lesson.current{background-color:var(--nav-active-bg);border:1px solid var(--nav-active-border);color:var(--text-primary)}[data-theme=dark] .module-lessons{border-color:rgba(255,255,255,.15)}[data-theme=dark] .toggle-icon{color:var(--text-secondary)}@media (max-width:1024px){#main-layout{grid-template-columns:minmax(200px,250px) 1fr minmax(200px,250px)}#main-layout.left-collapsed{grid-template-columns:0 1fr minmax(200px,250px)}#main-layout.right-collapsed{grid-template-columns:minmax(200px,250px) 1fr 0}#main-layout.left-collapsed.right-collapsed{grid-template-columns:0 1fr 0}}@media (max-width:1024px){#main-layout{grid-template-columns:1fr;grid-template-areas:"content";height:100%;overflow:hidden!important;position:relative}#main-layout.left-collapsed,#main-layout.left-collapsed.right-collapsed,#main-layout.right-collapsed{grid-template-columns:1fr;grid-template-areas:"content"}#content-area{grid-area:content;width:100%!important;min-width:0!important;padding:0;display:block!important;overflow-y:auto!important;overflow-x:hidden!important;overscroll-behavior-y:contain!important;-webkit-overflow-scrolling:touch}#left-sidebar{position:fixed;top:var(--header-height);left:0;height:calc(100vh - var(--header-height) - var(--control-bar-height));width:var(--sidebar-width);min-width:250px;max-width:85vw;z-index:1100;transform:translateX(-100%);box-shadow:2px 0 10px rgba(0,0,0,.2);overflow-y:auto;overflow-x:hidden}#main-layout.sidebar-animating #left-sidebar{transition:transform .35s var(--ease-in-out, ease-in-out)}#left-sidebar:not(.collapsed){transform:translateX(0)}#main-layout.content-only #left-sidebar{transform:none!important;position:static!important;box-shadow:none!important}}@media (max-width:768px){.control-bar-container{padding:0 var(--spacing-sm)}.lesson-controls{gap:var(--spacing-xs)}}@media (max-width:480px){.control-bar-container{padding:0 var(--spacing-xs)}.lesson-controls{gap:.25rem}#complete-lesson-btn{padding:var(--spacing-xs);font-size:.875rem}#complete-lesson-btn .btn-text{display:none}#complete-lesson-btn::after{content:attr(aria-label);position:absolute;top:-2.5rem;left:50%;transform:translateX(-50%);background:var(--text-primary);color:var(--background-color);padding:.25rem .5rem;border-radius:.25rem;font-size:.75rem;white-space:nowrap;opacity:0;pointer-events:none;transition:opacity .2s ease}#complete-lesson-btn:hover::after{opacity:1}}@media (max-width:1200px){#content-area{min-width:0!important;flex:1}}@media (max-width:480px){#content-area{width:100%!important;min-width:0!important;max-width:100%!important}#lesson-content{padding:var(--spacing-sm);max-width:none}}@media (max-width:1024px){#content-area{display:block!important;visibility:visible!important;opacity:1!important;width:100%!important;min-width:0!important;grid-area:content!important}#main-layout{width:100%!important;min-width:100%!important;grid-template-columns:1fr!important;grid-template-areas:"content"!important}#left-sidebar,#right-sidebar{position:fixed!important;z-index:100!important}#main-layout.content-only{grid-template-columns:1fr!important;grid-template-areas:"content"!important}#main-layout.content-only #content-area{display:block!important;width:100%!important}}@keyframes content-fade-in{0%{opacity:0;transform:translateY(10px);filter:blur(6px)}100%{opacity:1;transform:translateY(0);filter:blur(0)}}@keyframes fadeIn{from{opacity:0}to{opacity:1}}@supports (corner-shape:squircle){:root{--sq-mult:1.6}:root{--bttn-radius:1.6rem}.bttn:not(.bttn-icon){corner-shape:squircle}.bttn.bttn-icon{border-radius:30px;corner-shape:squircle}}.single-course-view .single-course-view-module .module-anim{display:inline-flex;flex-shrink:0;width:36px;height:36px;color:var(--text-tertiary-color);pointer-events:none}.single-course-view .single-course-view-module .module-anim svg{width:100%;height:100%}.single-course-view .single-course-view-module.not-started .module-anim{opacity:.7}.single-course-view .single-course-view-module .module-number-row .module-number-badge[role]{position:relative;border-color:transparent}.single-course-view .single-course-view-module .module-ring{position:absolute;inset:-1.5px;width:calc(100% + 3px);height:calc(100% + 3px);fill:none;stroke-width:2.6;stroke-linecap:round;pointer-events:none}.single-course-view .single-course-view-module .module-ring-track{stroke:var(--shadow-border)}.single-course-view .single-course-view-module .module-ring-fill{stroke:#fb9800}.single-course-view .single-course-view-module.completed .module-ring-fill{stroke:var(--success-color)}.single-course-view .single-course-view-module .module-number{position:relative}.module-view{max-width:960px;margin:0 auto;padding:var(--spacing-lg) var(--spacing-md);overflow-x:hidden;background-color:var(--content-bg)}.module-view .module-view-header{text-align:center;margin-bottom:var(--spacing-md);position:relative}.module-view .module-status{display:inline-block;margin-bottom:var(--spacing-sm)}.module-view .module-status.completed{color:var(--success-color);background-color:rgba(0,205,0,.05);box-shadow:0 0 8px 1px rgba(0,205,0,.1);border-radius:var(--radius-xs);corner-shape:squircle;padding:.1rem .4rem;font-weight:400}.module-view .module-status.in-progress{color:#ff9800;background-color:rgba(255,152,0,.05);box-shadow:0 0 8px 1px rgba(255,152,0,.1);border-radius:var(--radius-xs);corner-shape:squircle;padding:.1rem .4rem;font-weight:400}.module-view .module-status.not-started{color:var(--text-muted-color);font-weight:500}.module-view .module-view-title{margin-bottom:var(--spacing-md);color:var(--text-primary);line-height:2rem;font-size:var(--text-xxl);letter-spacing:var(--ls-base)}.module-view .module-prefix{color:var(--text-muted-color)}.module-view .module-view-description{margin-bottom:var(--spacing-lg);padding:var(--spacing-md);background:var(--sidebar-bg);border-radius:var(--radius-md);corner-shape:squircle;box-shadow:0 2px 4px rgba(0,0,0,.05)}.module-view .module-view-description h2{font-size:1.5rem;font-weight:600;margin-bottom:var(--spacing-sm);color:var(--text-primary);padding-bottom:var(--spacing-xs)}.module-view .module-description-content{line-height:1.7;color:var(--text-secondary);font-size:1rem}.module-view .module-view-actions{display:flex;justify-content:center;gap:10px;margin-bottom:var(--spacing-md);flex-wrap:wrap}.module-view .module-view-actions .bttn{min-height:47px;min-width:47px;padding:.8rem 1rem;font-size:var(--text-base)}.module-view .module-view-actions .restart-module-btn:hover{color:#ff2626;background-color:rgba(255,38,38,.1);border-color:rgba(255,38,38,.2)}.module-view .module-action-buttons{display:flex;gap:var(--spacing-xs)}.module-view .module-view-lessons{margin-top:5rem}.module-view .lessons-section-title{display:block;font-size:var(--text-lg);font-weight:400;margin-bottom:var(--spacing-md);color:var(--text-tertiary-color);letter-spacing:var(--ls-base);text-align:left}.module-view .lessons-list{display:flex;flex-direction:column;gap:var(--spacing-md)}.module-view .module-view-lesson{position:relative;border-radius:var(--radius-md);corner-shape:squircle;padding:var(--spacing-lg) var(--spacing-md);display:grid;grid-template-columns:auto 1fr auto;grid-template-areas:"number content actions";gap:var(--spacing-sm) var(--spacing-md);align-items:center;box-shadow:var(--card-shadow);overflow:hidden;z-index:0}.module-view .module-view-lesson{--lesson-grow:1.35}.module-view .module-view-lesson.completed{--lesson-tint:0,175,0}.module-view .module-view-lesson.started{--lesson-tint:251,191,36}.module-view .module-view-lesson.not-started{--lesson-tint:0,114,255}.module-view .module-view-lesson::before{content:'';position:absolute;inset:0;z-index:-1;background:linear-gradient(120deg,rgba(var(--lesson-tint,0,114,255),.22) 0,transparent 65%);transform-origin:left center;transform:scaleX(1);pointer-events:none}.module-view .module-view-lesson:hover::before{transform:scaleX(var(--lesson-grow))}[data-theme=dark] .module-view .module-view-lesson::before{background:linear-gradient(120deg,rgba(var(--lesson-tint,0,114,255),.16) 0,transparent 65%)}.module-view .lesson-number{grid-area:number;width:42px;height:42px;border-radius:var(--radius-lg);corner-shape:squircle;display:flex;align-items:center;justify-content:center;font-weight:600;font-size:var(--text-lg);color:var(--text-primary-color);flex-shrink:0;align-self:center;background:rgba(255,255,255,.15);backdrop-filter:blur(5px);-webkit-backdrop-filter:blur(5px);border:1px solid var(--shadow-border)}[data-theme=dark] .module-view .lesson-number{background:rgba(255,255,255,.05)}.module-view .lesson-content{grid-area:content;min-width:0;display:flex;flex-direction:column;justify-content:center;gap:.5rem}.module-view .lesson-title{font-size:var(--text-lg);font-weight:500;color:var(--text-primary);line-height:1.6;display:flex;align-items:center;gap:.5rem}.module-view .lesson-title svg{flex-shrink:0;width:var(--text-lg)!important;height:var(--text-lg)!important;scale:1.1}.module-view .lesson-status-label{font-size:var(--text-xs);font-weight:500;letter-spacing:var(--ls-lg);text-transform:uppercase}.module-view .module-view-lesson.completed .lesson-status-label{color:var(--success-color)}.module-view .module-view-lesson.started .lesson-status-label{color:#fb9800}.module-view .lesson-description{line-height:1.6;color:var(--text-tertiary-color);font-size:var(--text-base);margin-bottom:0;transition:color var(--dur-base) var(--ease-out)}.module-view .module-view-lesson:hover .lesson-description{color:var(--text-secondary-color)}.module-view .lesson-actions{grid-area:actions;flex-shrink:0;justify-self:end;align-self:center;display:flex;gap:var(--spacing-xs)}.module-view .lesson-actions .start-lesson-btn{padding-left:1.5rem;padding-right:1.5rem;font-size:var(--text-base)}@media (max-width:768px){.module-view .module-view{padding:var(--spacing-md) var(--spacing-sm)}.module-view .module-view-title{font-size:1.875rem}.module-view .module-view-lesson{grid-template-columns:1fr auto;grid-template-areas:"number number" "content actions"}.module-view .lesson-number{justify-self:start;margin-bottom:var(--spacing-xs)}.module-view .lesson-actions{justify-self:end;align-self:start}}@media (max-width:480px){.module-view .module-view-title{font-size:1.6rem}.module-view .module-view-description{padding:var(--spacing-sm)}.module-view .module-view-description h2{font-size:1.3rem}.module-view .module-description-content{font-size:.95rem}.module-view .module-view-lesson{grid-template-columns:1fr;grid-template-areas:"number" "content" "actions";text-align:left}.module-view .lesson-number{justify-self:center;margin-bottom:var(--spacing-xs)}.module-view .lesson-content{align-items:center;text-align:center}.module-view .lesson-title{justify-content:center}.module-view .lesson-actions{margin-top:var(--spacing-sm);justify-content:center}.module-view .lesson-actions{margin-top:var(--spacing-sm);justify-content:center;align-items:center;width:100%}.module-view .lesson-actions .start-lesson-btn{width:100%}}.module-view-footer{margin-top:var(--spacing-2xl);padding-top:var(--spacing-xl);text-align:center;color:var(--text-secondary)}.module-view-lesson-skeleton{display:flex;align-items:flex-start;gap:var(--spacing-lg);padding:var(--spacing-lg);background:var(--bg-secondary);border-radius:var(--radius-md);corner-shape:squircle;margin-bottom:var(--spacing-md);box-shadow:0 0 0 1px var(--shadow-border)}.module-view-lesson-skeleton .lesson-number{display:flex;align-items:center;justify-content:center;width:42px;height:42px;background:var(--bg-primary);border-radius:var(--radius-lg);corner-shape:squircle;font-weight:600;font-size:var(--font-size-lg);color:var(--text-primary);flex-shrink:0}.module-view-lesson-skeleton .lesson-content{flex:1;display:flex;flex-direction:column}.module-view-lesson-skeleton .skeleton-title{height:24px;width:70%;border-radius:var(--radius-xs)}.module-view-lesson-skeleton .skeleton-description{height:16px;width:100%;border-radius:var(--radius-xs)}.module-view-lesson-skeleton .skeleton-status{height:20px;width:120px;border-radius:var(--radius-xs);margin-top:var(--spacing-xs)}.module-view-lesson-skeleton .lesson-actions{flex-shrink:0}.module-view-lesson-skeleton .skeleton-button{height:40px;width:100px;border-radius:var(--radius-sm)}.skeleton{background:linear-gradient(90deg,var(--skeleton-base,#e0e0e0) 0,var(--skeleton-shine,#f0f0f0) 50%,var(--skeleton-base,#e0e0e0) 100%);background-size:200% 100%;animation:skeleton-shine 1.5s ease-in-out infinite}@keyframes skeleton-shine{0%{background-position:-200% 0}100%{background-position:200% 0}}[data-theme=dark] .skeleton{--skeleton-base:#2a2a2a;--skeleton-shine:#333333}#left-sidebar .nav-module{margin-bottom:1rem}#left-sidebar .nav-module .module-header{display:flex;align-items:center;cursor:pointer}#left-sidebar .nav-module .module-info{flex-grow:1;min-width:0;height:2.5rem}#left-sidebar .nav-module .module-title{font-weight:400;font-size:calc(var(--text-base) * .95);line-height:1.4;margin:0;overflow:hidden;white-space:nowrap;letter-spacing:var(--ls-lg);height:2.5rem;align-content:center;font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,Oxygen,Ubuntu,Cantarell,'Open Sans','Helvetica Neue',sans-serif;font-optical-sizing:auto;transition:color var(--dur-base, .2s) var(--ease-out, ease),font-weight var(--dur-base, .2s) var(--ease-out, ease);color:var(--text-secondary)}#left-sidebar .nav-module .module-header:hover .module-title{color:var(--text-primary);font-weight:500}#left-sidebar .nav-module .module-toggle{background:0 0;border:none;padding:0;cursor:pointer;line-height:1;display:flex;align-items:center;flex-shrink:0}#left-sidebar .nav-module .toggle-icon{width:1rem;height:1rem;transition:transform .2s ease;align-self:center}#left-sidebar .nav-module.expanded .toggle-icon{transform:rotate(90deg)}#left-sidebar svg{stroke:currentColor!important;stroke-width:1.8}#left-sidebar .nav-module .module-lessons{display:none!important;padding:0;overflow:hidden;background:var(--lesson-bg);margin-top:var(--spacing-xs)}#left-sidebar .nav-module.expanded .module-lessons{display:block!important}#left-sidebar .module-lessons.expanded{display:block!important}#left-sidebar .nav-lesson{padding:0 .75rem;cursor:pointer;height:2.5rem;display:flex;border-radius:var(--radius-lg);corner-shape:squircle;margin-bottom:var(--spacing-xs);background:0 0;border:1px solid transparent;transition:border-color var(--dur-fast, .15s) var(--ease-out, ease),color var(--dur-fast, .15s) var(--ease-out, ease);position:relative;margin-left:2px;margin-right:2px}#left-sidebar .nav-lesson:hover{border-color:var(--border-color);opacity:1!important}#left-sidebar .nav-lesson.current{border-color:rgba(0,114,255,.5);box-shadow:0 0 1px 0 #0072ff;color:var(--text-primary)}#left-sidebar .nav-lesson.current::before{content:'';position:absolute;right:.5rem;top:50%;transform:translateY(-50%);width:.25rem;height:.25rem;background:var(--active-green);border-radius:50%;animation:pulse-dot 3.5s ease-in-out infinite;z-index:3}@keyframes pulse-dot{0%,100%{opacity:.3;transform:translateY(-50%) scale(1)}50%{opacity:1;transform:translateY(-50%) scale(1.15)}}#left-sidebar .nav-lesson.completed{opacity:.75}#left-sidebar .lesson-title-row{display:flex;align-items:center;width:100%;min-width:0;margin:0}#left-sidebar .lesson-title{font-size:var(--text-md);line-height:normal;color:var(--text-secondary);overflow:hidden;text-overflow:ellipsis;white-space:nowrap;display:flex;align-items:center;flex:1;height:2.25rem;font-optical-sizing:auto}#left-sidebar .lesson-title .marquee-text{padding:.69rem 0;margin:-.69rem 0}#left-sidebar .lesson-title svg,#left-sidebar .module-title svg{width:1.05rem;height:1.05rem;flex-shrink:0;vertical-align:middle;margin-right:7px}#left-sidebar .lesson-progress-indicator{flex-shrink:0;width:1.2rem;height:1.2rem;display:flex;align-items:center;justify-content:center}#left-sidebar .circular-progress-sidebar{position:relative;width:1.2rem;height:1.2rem;display:flex;align-items:center;justify-content:center}#left-sidebar .progress-circle{width:1.2rem;height:1.2rem;transform:rotate(-90deg);position:absolute;top:0;left:0}#left-sidebar .progress-circle-bg{fill:none;stroke:var(--border-color);stroke-width:2;opacity:.6}#left-sidebar .progress-circle-fill{fill:none;stroke:var(--primary-color);stroke-width:2;stroke-linecap:round;transition:stroke-dashoffset .3s ease}#left-sidebar .circular-progress-sidebar[data-progress="0"] .progress-circle-fill{opacity:0}#left-sidebar .title-check-icon,#left-sidebar .title-check-icon svg,#left-sidebar svg.title-check-icon{width:1.2rem;height:1.2rem;color:var(--success-color);stroke-width:2.5;flex-shrink:0}.lessons-loading{padding:var(--spacing-md);text-align:center;color:var(--text-secondary);font-size:var(--font-size-sm)}.lessons-loading.active{display:flex;align-items:center;justify-content:center;gap:var(--spacing-sm)}.lessons-loading .loading-icon{width:16px;height:16px;animation:spin 1s linear infinite}@keyframes spin{0%{transform:rotate(0)}100%{transform:rotate(360deg)}}.lessons-error{padding:var(--spacing-md);text-align:center;color:var(--color-danger);font-size:var(--font-size-sm)}.lessons-error p{margin:0 0 var(--spacing-sm) 0}.lessons-error .retry-btn{padding:var(--spacing-xs) var(--spacing-sm);background:var(--color-danger);color:#fff;border:none;border-radius:var(--radius-sm);corner-shape:squircle;font-size:var(--font-size-xs);cursor:pointer;transition:opacity .2s ease}.lessons-error .retry-btn:hover{opacity:.8}.no-lessons{padding:var(--spacing-md);text-align:center;color:var(--text-secondary);font-size:var(--font-size-sm);font-style:italic}.lesson-practice-container{width:100%;max-width:100%;position:relative;overflow:visible;min-height:400px}.practice-question{width:100%}.question-header-nav{display:flex;align-items:center;justify-content:space-between;padding-bottom:2rem;flex-wrap:wrap;gap:1rem}.question-header-main{display:flex;flex-direction:column;gap:.3rem;min-width:0}.lesson-practice-container .question-header-nav h3{margin:0}.question-nav-buttons{display:flex;align-items:center;gap:.75rem}.question-nav-buttons .bttn{display:flex;align-items:center;justify-content:center}.question-nav-buttons .bttn:disabled{opacity:.5;cursor:not-allowed}.question-meta-wrapper{display:inline-flex;align-items:center;gap:.5rem}.question-meta-wrapper:empty{display:none}.stat-num{font-variant-numeric:tabular-nums}.question-body.is-locked .mcq-choices{pointer-events:none}.question-body.is-locked textarea.frq-answer,.question-body.is-locked textarea.gq-answer-input{cursor:default}.question-meta-wrapper .meta-divider::before{content:"•";color:var(--text-tertiary-color);font-weight:700}.question-meta-wrapper .attempts-count{color:var(--text-tertiary-color);font-size:var(--text-sm)}.question-type-badge{display:inline-flex;align-items:center;justify-content:center;padding:var(--badge-padding-y) var(--badge-padding-x);font-size:var(--text-sm);font-weight:600;letter-spacing:var(--ls-base);border-radius:5px;line-height:normal}.question-type-badge.mcq{background:color-mix(in srgb,var(--brand-color) 15%,transparent);color:var(--brand-color);border:1px solid color-mix(in srgb,var(--brand-color) 25%,transparent)}.question-type-badge.frq{background:color-mix(in srgb,var(--active-green) 15%,transparent);color:var(--active-green);border:1px solid color-mix(in srgb,var(--active-green) 25%,transparent)}.question-type-badge.gq{background:color-mix(in srgb,#ff6b35 15%,transparent);color:#ff6b35;border:1px solid color-mix(in srgb,#ff6b35 25%,transparent)}.question-header-title{position:relative;display:flex;align-items:center;gap:.6rem;min-width:0}.question-title.has-jump{cursor:pointer;border-bottom:1px dotted var(--text-tertiary-color);padding-bottom:2px}.question-number-roll{font-variant-numeric:tabular-nums}.question-jump-panel{position:absolute;top:calc(100% + 10px);left:0;z-index:60;width:min(380px,88vw);padding:var(--spacing-sm) var(--spacing-sm) var(--spacing-md,1rem);background:color-mix(in oklab,var(--bg-color) 82%,transparent);-webkit-backdrop-filter:blur(10px) saturate(1.4);backdrop-filter:blur(10px) saturate(1.4);-webkit-font-smoothing:antialiased;border:none;border-radius:var(--radius-md);corner-shape:squircle;box-shadow:var(--shadow-layered);opacity:0;transform:translateY(-4px);pointer-events:none;transition:opacity var(--dur-fast) var(--ease-out),transform var(--dur-fast) var(--ease-out)}.question-jump-panel.is-open{opacity:1;transform:none;pointer-events:auto}.question-jump-panel .jump-panel-title{margin:0;font-size:var(--text-md);font-weight:600;color:var(--text-primary-color)}.question-jump-panel .jump-panel-sub{margin:0 0 var(--spacing-xs);font-size:var(--text-xs);color:var(--text-tertiary-color)}.question-jump-panel .jump-panel-grid+.jump-panel-title{margin-top:var(--spacing-md,1rem)}.is-open .jump-panel-stats,.is-open .jump-panel-sub,.is-open .jump-panel-title{animation:jump-chunk-in .25s var(--ease-out) both}.is-open .jump-panel-sub{animation-delay:30ms}.is-open .jump-panel-stats{animation-delay:160ms}.jump-panel-stats{display:flex;flex-direction:column;gap:var(--spacing-sm)}.jump-stat-head{display:flex;align-items:center;justify-content:space-between;gap:.5rem;font-size:var(--text-md);margin-bottom:.3rem}.jump-stat-label{color:var(--text-secondary-color)}.jump-stat-num{color:var(--text-primary-color);font-weight:600;font-variant-numeric:tabular-nums}.jump-stat-track{position:relative;height:6px;border-radius:999px;background:color-mix(in oklab,var(--text-tertiary-color) 20%,transparent)}.jump-stat-fill{height:100%;border-radius:999px;background:var(--active-yellow)}.jump-stat-row.is-met .jump-stat-fill{background:var(--active-green)}.jump-stat-target{position:absolute;top:50%;transform:translate(-50%,-50%);display:inline-flex;color:#fff}.jump-stat-target svg{width:20px;height:20px;fill:#ffc53d;filter:drop-shadow(0 1px 2px color-mix(in oklab, #ffc53d 70%, transparent))}.jump-panel-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(56px,1fr));gap:10px}.jump-square{appearance:none;position:relative;aspect-ratio:1;display:inline-flex;align-items:center;justify-content:center;padding:0;font-family:inherit;font-size:var(--text-base);font-weight:600;font-variant-numeric:tabular-nums;color:var(--text-tertiary-color);background:linear-gradient(to top,color-mix(in oklab,var(--zone,transparent) 25%,transparent) 0 var(--fill,0),transparent var(--fill,0) 100%);background-clip:padding-box;border:1px dotted var(--text-tertiary-color);border-radius:calc(var(--radius-lg) * 2);corner-shape:squircle;cursor:pointer;transition:transform var(--dur-fast) var(--ease-out),border-color var(--dur-fast) var(--ease-out),box-shadow var(--dur-fast) var(--ease-out)}.jump-square.zone-low{--zone:var(--active-red)}.jump-square.zone-mid{--zone:var(--active-yellow)}.jump-square.zone-high{--zone:var(--active-green)}.jump-square.zone-high,.jump-square.zone-low,.jump-square.zone-mid{border-style:solid;border-color:var(--zone);color:var(--zone)}.is-open .jump-square{animation:jump-chunk-in .25s var(--ease-out) both;animation-delay:calc(90ms + var(--i, 0) * 16ms)}@keyframes jump-chunk-in{from{opacity:0;transform:translateY(4px)}}.jump-square:hover{transform:translateY(-1px);border-color:transparent;box-shadow:var(--shadow-sm)}.jump-square:active{transform:scale(.96)}.jump-square.is-current{outline:2px solid var(--brand-color);outline-offset:2px}@media (prefers-reduced-motion:reduce){.jump-square,.question-jump-panel{transition:none}.jump-square:active,.jump-square:hover{transform:none}.is-open .jump-panel-stats,.is-open .jump-panel-title,.is-open .jump-square{animation:none}}.practice-stats-strip{display:flex;flex-wrap:wrap;align-items:center;gap:.75rem;font-size:var(--text-sm);color:var(--text-tertiary-color)}.practice-stats-strip.is-empty{display:none}.attempts-avg{position:relative;color:var(--text-tertiary-color);font-size:var(--text-sm);cursor:default;border-bottom:1px dotted var(--text-tertiary-color);padding-bottom:2px}.attempts-avg:focus-visible{outline:0;color:var(--text-color)}.attempts-avg .score-scale{position:absolute;bottom:calc(100% + 8px);left:50%;width:216px;padding:18px 16px 14px;background:var(--tooltip-bg);border-radius:var(--radius-sm);corner-shape:squircle;box-shadow:var(--shadow-layered);opacity:0;visibility:hidden;pointer-events:none;transform:translateX(-50%) translateY(4px);transition:opacity var(--dur-fast) var(--ease-out),transform var(--dur-fast) var(--ease-out),visibility 0s linear var(--dur-fast);z-index:20}.attempts-avg:focus .score-scale,.attempts-avg:hover .score-scale{opacity:1;visibility:visible;transform:translateX(-50%) translateY(0);transition:opacity var(--dur-fast) var(--ease-out),transform var(--dur-fast) var(--ease-out)}.score-scale .zone-low{--zone:var(--active-red)}.score-scale .zone-mid{--zone:var(--active-yellow)}.score-scale .zone-high{--zone:var(--active-green)}.score-scale-track{position:relative;display:block;height:4px;margin:2px 5px 14px;border-radius:999px;background:linear-gradient(to right,color-mix(in oklab,var(--active-red) 45%,transparent) 0 60%,color-mix(in oklab,var(--active-yellow) 45%,transparent) 60% 80%,color-mix(in oklab,var(--active-green) 45%,transparent) 80% 100%)}.score-scale-marker{position:absolute;top:50%;width:8px;height:8px;transform:translate(-50%,-50%);border-radius:50%;background:var(--zone);box-shadow:0 0 0 2px var(--tooltip-bg)}.score-scale-marker--min{left:calc(var(--min) * 1%)}.score-scale-marker--max{left:calc(var(--max) * 1%)}.score-scale-marker--avg{left:calc(var(--avg) * 1%);width:10px;height:10px;transform:translate(-50%,-50%) rotate(45deg);border-radius:2px;z-index:1}.score-scale-rows{display:flex;flex-direction:column;gap:7px}.score-scale-row{display:flex;align-items:center;gap:8px;font-size:var(--text-xs);line-height:1.2;color:rgba(255,255,255,.75)}.score-scale-row-value{margin-left:auto;font-weight:600;color:var(--zone)}.score-scale-swatch{flex:none;width:7px;height:7px;border-radius:50%;background:var(--zone)}.score-scale-row--avg .score-scale-swatch{transform:rotate(45deg);border-radius:1.5px}.score-scale-caption{display:block;width:100%;text-align:center;font-size:var(--text-xs);color:rgba(255,255,255,.8)}.score-scale-caption span{color:var(--zone);font-weight:600}@media (max-width:520px){.attempts-avg .score-scale{left:0;transform:translateX(-30%) translateY(4px)}.attempts-avg:focus .score-scale,.attempts-avg:hover .score-scale{transform:translateX(-30%) translateY(0)}}@media (prefers-reduced-motion:reduce){.attempts-avg .score-scale{transition:none}}.question-body{transition:opacity var(--dur-fast) var(--ease-out),filter var(--dur-fast) var(--ease-out)}.question-body.is-switching{opacity:0;filter:blur(6px)}@media (prefers-reduced-motion:reduce){.question-body.is-switching{opacity:1;filter:none}}.question-navigation{display:flex;align-items:center;justify-content:space-between;margin-bottom:2rem}.nav-btn{display:flex;align-items:center;gap:.5rem;min-width:100px}.nav-btn:disabled{opacity:.5;cursor:not-allowed}.question-progress{font-size:var(--text-sm);font-weight:500;color:var(--text-secondary-color);letter-spacing:var(--ls-sm)}.question-content{margin-bottom:2rem}[data-theme=dark] .question-images{background:#000;padding:1.5rem;border-radius:var(--radius-md);corner-shape:squircle}.question-text{font-size:var(--text-base);color:var(--text-primary-color);margin-bottom:1.5rem}.choice-images,.part-images,.question-images{display:flex;flex-direction:column;gap:1rem;margin:1.5rem 0}.choice-image,.part-image,.question-image{max-width:100%;height:auto;max-height:350px;border-radius:var(--radius-md);corner-shape:squircle;align-self:center;cursor:zoom-in}.mcq-choices{display:flex;flex-direction:column;gap:.75rem;margin-top:1.5rem;margin-bottom:3rem}.mcq-choice{display:flex;align-items:center;gap:.85rem;padding:.6rem 1.1rem;border:1px solid var(--input-border-color);border-radius:var(--radius-md);corner-shape:squircle;cursor:pointer;transition:border-color var(--dur-fast) var(--ease-out),background-color var(--dur-fast) var(--ease-out),box-shadow var(--dur-fast) var(--ease-out);position:relative}.choice-text{line-height:1.5}.mcq-choice .katex-display{margin:0}.mcq-choice.mcq-choice--tall{border-radius:var(--radius-sm)}.mcq-choice:hover{border-color:var(--brand-light);background-color:color-mix(in srgb,var(--brand-color) 4%,transparent)}.mcq-choice:has(.mcq-input:checked){border-color:var(--brand-color);background-color:color-mix(in srgb,var(--brand-color) 8%,transparent);box-shadow:0 0 0 1px var(--brand-color)}.choice-letter{flex-shrink:0;font-weight:600;font-variant-numeric:tabular-nums;color:var(--text-secondary);min-width:1.4em}.mcq-choices.is-single .mcq-input{position:absolute;opacity:0;width:1px;height:1px;pointer-events:none}.mcq-choices.is-multi .mcq-input{flex-shrink:0;margin:0;accent-color:var(--brand-color);width:1.1rem;height:1.1rem;cursor:pointer}.choice-text{font-size:var(--text-base)}.frq-parts{margin:1.5rem 0}.frq-parts.frq-accordion{display:block}.frq-accordion{--frq-radius:var(--radius-md);--frq-duration:0.26s;--frq-ease:linear(
        0 0%, 0.2688 9.91%, 0.3859 15%, 0.4917 20.19%, 0.5865 25.5%,
        0.6705 30.93%, 0.7441 36.51%, 0.8075 42.26%, 0.8593 47.98%,
        0.9022 53.93%, 0.9366 60.13%, 0.963 66.67%, 0.9812 73.4%,
        0.9929 80.76%, 0.9986 88.89%, 1 100%
    );--frq-detach-margin:0.5rem;--nn-spring-gap:var(--frq-detach-margin);--nn-spring-radius:var(--frq-radius);--nn-spring-line:var(--border-color);--frq-reveal-blur:10px;--frq-reveal-opacity:0.4;--frq-reveal-y:1rem}.frq-part{position:relative;background:var(--card-bg-color,transparent);border:1px solid var(--border-color);border-top-color:transparent;corner-shape:squircle;transition-property:border-radius,margin,border-color,translate;transition-duration:var(--frq-duration);transition-timing-function:var(--frq-ease)}.frq-part:first-of-type{border-top-color:var(--border-color);border-top-left-radius:var(--frq-radius);border-top-right-radius:var(--frq-radius)}.frq-part:last-of-type{border-bottom-left-radius:var(--frq-radius);border-bottom-right-radius:var(--frq-radius)}.frq-part:has(+ .frq-part[open]){border-bottom-left-radius:var(--frq-radius);border-bottom-right-radius:var(--frq-radius)}.frq-part[open]+.frq-part{border-top-color:var(--border-color);border-top-left-radius:var(--frq-radius);border-top-right-radius:var(--frq-radius)}.frq-part[open]{margin-block:var(--frq-detach-margin);border-radius:var(--frq-radius);border-top-color:var(--border-color);z-index:2}.frq-part[open]:first-of-type{margin-block-start:0}.frq-part[open]:last-of-type{margin-block-end:0}[data-theme=dark] .frq-part,[data-theme=dark] .frq-part:first-of-type,[data-theme=dark] .frq-part[open],[data-theme=dark] .frq-part[open]+.frq-part{border-color:rgba(255,255,255,.16)}[data-theme=dark] .frq-part{border-top-color:transparent}[data-theme=dark] .frq-part:first-of-type,[data-theme=dark] .frq-part[open],[data-theme=dark] .frq-part[open]+.frq-part{border-top-color:rgba(255,255,255,.16)}[data-theme=dark] .frq-accordion{--nn-spring-line:rgba(255, 255, 255, 0.16)}.frq-part-summary{display:flex;align-items:center;justify-content:space-between;gap:.5rem;padding:1rem 1.5rem;cursor:pointer;user-select:none;list-style:none}.frq-part-summary::-webkit-details-marker{display:none}.frq-part-summary::marker{content:'';font-size:0}.frq-part-icon{width:18px;height:18px;flex-shrink:0;color:var(--text-muted-color);transition:transform var(--frq-duration) var(--frq-ease),color var(--dur-fast) var(--ease-out)}.frq-part[open] .frq-part-icon{transform:rotate(135deg)}.frq-part-summary:hover .frq-part-icon{color:var(--text-primary-color)}.frq-part-content{padding:0 1.5rem 1.25rem;opacity:var(--frq-reveal-opacity);translate:0 var(--frq-reveal-y);filter:blur(var(--frq-reveal-blur));transition-property:opacity,translate,filter;transition-duration:var(--frq-duration);transition-timing-function:var(--frq-ease)}.frq-part[open] .frq-part-content{opacity:1;translate:0 0;filter:blur(0)}.frq-part.nn-spring-closing .frq-part-content{opacity:0;filter:blur(4px);transition-duration:140ms}.frq-part.nn-spring-closing .frq-part-icon{transform:rotate(0)}@media (prefers-reduced-motion:reduce){.frq-part,.frq-part-content,.frq-part-icon{transition-duration:1ms}.frq-part-content{opacity:1;translate:0;filter:none}}.frq-meta{display:flex;align-items:center;gap:1rem}.frq-label{font-size:var(--text-base);font-weight:600;color:var(--text-primary-color);letter-spacing:var(--ls-md)}.frq-points{font-size:var(--text-sm);color:var(--text-secondary-color);background:color-mix(in oklab,var(--text-tertiary-color) 12%,transparent);padding:.25rem .5rem;border-radius:6px;border:1px solid color-mix(in oklab,var(--text-tertiary-color) 22%,transparent);transition:all .2s ease;letter-spacing:var(--ls-lg)}.part-question{font-size:var(--text-base);line-height:1.6;color:var(--text-primary-color);margin-bottom:1rem}textarea.frq-answer,textarea.gq-answer-input{display:flex;width:100%;min-height:120px;max-height:300px;overflow-y:auto;padding:.75rem .9rem;border:1px solid var(--border-color);border-radius:var(--radius-sm);corner-shape:squircle;font-family:inherit;font-size:var(--text-base);line-height:1.7;color:var(--text-primary-color);background:var(--bg-color);resize:vertical;transition:border-color .25s ease,box-shadow .25s ease,background-color .25s ease}textarea.frq-answer{background:color-mix(in srgb,var(--bg-color) 70%,var(--card-bg-color,transparent))}@supports (field-sizing:content){textarea.frq-answer,textarea.gq-answer-input{field-sizing:content;resize:none}}textarea.frq-answer:focus,textarea.gq-answer-input:focus{outline:0;border-color:var(--brand-light);box-shadow:0 0 0 2px color-mix(in srgb,var(--brand-color) 20%,transparent)}textarea.frq-answer::placeholder,textarea.gq-answer-input::placeholder{color:var(--text-tertiary-color)}.gq-answer{margin:1.5rem 0}.practice-question .incorrect{border-color:#ee1c1c!important;background:linear-gradient(169deg,color-mix(in srgb,#ee1c1c 8%,var(--bg-color)) 0,color-mix(in srgb,#ee1c1c 4%,var(--bg-color)) 55%,transparent 100%)!important;box-shadow:0 0 12px 0 color-mix(in srgb,#ee1c1c 20%,transparent)!important}.practice-question .correct{border-color:var(--active-green)!important;background:linear-gradient(169deg,color-mix(in srgb,var(--active-green) 8%,var(--bg-color)) 0,color-mix(in srgb,var(--active-green) 4%,var(--bg-color)) 55%,transparent 100%)!important;box-shadow:0 0 12px 0 color-mix(in srgb,var(--active-green) 20%,transparent)!important}.practice-question .partial{border-color:#f3a31a!important;background:linear-gradient(169deg,color-mix(in srgb,#f3a31a 8%,var(--bg-color)) 0,color-mix(in srgb,#f3a31a 4%,var(--bg-color)) 55%,transparent 100%)!important;box-shadow:0 0 12px 0 color-mix(in srgb,#f3a31a 20%,transparent)!important}.question-actions{display:flex;align-items:center;justify-content:flex-start;flex-wrap:wrap;gap:1rem}.lesson-practice-container .bttn{min-height:2.5rem;min-width:2.5rem}.bttn .animate-spin{animation:spin 1s linear infinite}.question-feedback{margin:1.5rem 0;padding:.9rem 0;border-top:1px solid color-mix(in oklab,var(--text-tertiary-color) 28%,transparent);border-bottom:1px solid color-mix(in oklab,var(--text-tertiary-color) 28%,transparent);font-size:var(--text-base)}.question-feedback[data-status=correct] .feedback-status{color:var(--active-green)}.question-feedback[data-status=partial] .feedback-status{color:var(--active-yellow)}.question-feedback[data-status=incorrect] .feedback-status{color:var(--active-red)}.feedback-status{display:flex;align-items:center;gap:.75rem;flex-wrap:wrap}.feedback-status.notice{color:#d97706}.status-text{font-size:var(--text-base);font-weight:500;letter-spacing:var(--ls-md)}.score-text{font-size:var(--text-sm);color:var(--text-secondary-color);font-variant-numeric:tabular-nums;margin-left:auto}.feedback-content{margin-top:.6rem;color:var(--text-secondary-color)}.question-feedback .feedback-content p{margin:.25rem 0}.question-explanation{margin-top:2rem}.explanation-content{display:flex;flex-direction:column;gap:1.5rem}.answer-text:not(:last-child){margin-bottom:1.25rem}.answer-text ol,.answer-text ul{list-style-type:lower-alpha;margin:1rem 0}.lesson-practice-error{display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:3rem 2rem;background:var(--card-bg-color);border-radius:var(--radius-md);corner-shape:squircle;border:1px solid var(--input-border-color);margin:2rem 0}.lesson-practice-error .error-icon{width:48px;height:48px;color:var(--text-tertiary-color);margin-bottom:1rem}.lesson-practice-error h3{font-size:var(--text-lg);font-weight:500;color:var(--text-primary-color);margin-bottom:.5rem;letter-spacing:var(--ls-md)}.lesson-practice-error p{font-size:var(--text-base);color:var(--text-secondary-color);margin-bottom:1.5rem;max-width:400px}.question-explanation{scrollbar-width:thin;scrollbar-color:var(--text-tertiary-color) var(--card-bg-color)}.question-explanation::-webkit-scrollbar{height:8px}.question-explanation::-webkit-scrollbar-track{background:var(--card-bg-color);border-radius:4px}.question-explanation::-webkit-scrollbar-thumb{background:var(--text-tertiary-color);border-radius:4px}.question-explanation::-webkit-scrollbar-thumb:hover{background:var(--text-secondary-color)}.practice-loading-state{position:absolute;top:0;left:0;right:0;bottom:0;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;min-height:400px;z-index:10}.practice-loading-state[style*="display: none"]{display:none!important;visibility:hidden!important;z-index:-1!important}.practice-loading-state .loading-spinner{width:24px;height:24px;border:2px solid var(--input-border-color);border-top:2px solid var(--text-primary-color,#fff);border-radius:50%;animation:spin 1s linear infinite;flex-shrink:0;margin:0 auto}@keyframes spin{0%{transform:rotate(0)}100%{transform:rotate(360deg)}}.lesson-practice-container .practice-loading-state p{margin:.5rem 0;color:var(--text-tertiary-color);font-size:var(--text-base)!important;font-weight:400;letter-spacing:var(--ls-sm)}.practice-error-state{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;gap:.5rem;padding:2.5rem 1.5rem;background:var(--card-bg-color);min-height:400px;z-index:10}.practice-error-state[style*="display: none"]{display:none!important;visibility:hidden!important;z-index:-1!important}.practice-error-state[style*="display: block"]{display:flex!important}.practice-error-icon{display:grid;place-items:center;width:44px;height:44px;margin-bottom:.75rem;border-radius:50%;color:var(--text-tertiary-color);background:color-mix(in srgb,var(--text-tertiary-color) 10%,transparent)}.practice-error-icon i,.practice-error-icon svg{width:22px;height:22px}.practice-error-title{margin:0;font-size:var(--text-lg);font-weight:600;color:var(--text-primary-color);letter-spacing:var(--ls-md)}.practice-error-body{margin:0;max-width:38ch;font-size:var(--text-base);line-height:1.55;color:var(--text-secondary-color)}.practice-error-actions{margin-top:1rem}.practice-error-state.is-rate-limited{border-radius:var(--radius-md);corner-shape:squircle}.practice-error-state.is-rate-limited .practice-error-icon{color:var(--brand-color);background:color-mix(in srgb,var(--brand-color) 12%,transparent)}.practice-content-container{position:relative;width:100%;height:100%;min-height:400px;z-index:1}.explanation-content,.question-explanation{overflow:visible!important}.table-breakout-wrapper{position:relative;margin:0 0 1rem 0;max-width:100%;overflow-x:auto;overflow-y:visible}.table-breakout-wrapper.scrollable{overflow-x:auto;padding:15px 10px 30px 10px}.table-breakout-wrapper table{margin:0 auto;width:100%;max-width:100%}@media (min-width:1100px){.table-breakout-wrapper{margin:0 calc(-1 * min(6rem,12vw)) 1.5rem;max-width:min(1200px,90vw);overflow-x:visible}}.table-breakout-wrapper.no-breakout{margin-left:0;margin-right:0;max-width:100%}@media (max-width:1099px){.table-breakout-wrapper table{min-width:950px}}.table-scroll-indicator{position:absolute;top:0;left:1.5rem;font-size:var(--text-sm);color:var(--text-muted-color);background:0 0;padding:0;line-height:1;opacity:0;transition:opacity .3s ease;pointer-events:none;z-index:10}.table-breakout-wrapper.scrollable:hover .table-scroll-indicator{opacity:.9}.feedback-actions{margin-top:1rem;display:flex;gap:.75rem;align-items:center}.retry-question-btn{background:var(--card-bg-color);border:1px solid var(--input-border-color);color:var(--text-primary-color);transition:all .2s ease}.retry-question-btn:hover{background:var(--card-hover-bg-color);border-color:var(--text-secondary-color);transform:translateY(-1px)}.part-feedback-display{margin-top:1rem;padding-left:1rem;border-left:2px solid var(--text-secondary-color);font-size:var(--text-base);line-height:1.8;color:var(--text-secondary-color)}.lesson-practice-container .part-feedback-display p{margin:0 0 .5rem 0}.lesson-practice-container .part-feedback-display p:last-child{margin-bottom:0}.practice-answer-box{--nnmi-squircle-k:var(--sq-mult)}.practice-answer-box>.frq-answer{--nnmi-surface:color-mix(in srgb, var(--bg-color) 70%, var(--card-bg-color, transparent));--nnmi-radius-box:max(calc(var(--frq-radius, var(--radius-md)) - 1.5rem), 12px)}.frq-part:focus-within,.frq-part:has(.nnmi-pal:not([hidden]),.nnmi-pop:not([hidden])){z-index:3}#right-sidebar .tab-container.practice-draw-tab{position:absolute;inset:0;padding:0;--nnmi-dock-top:calc(0.625rem + 1px);--nnmi-dock-bottom:18px;--nnmi-dock-inset:0.75rem;--nnmi-squircle-k:var(--sq-mult)}.practice-input-wrapper{position:relative;width:100%}@media (max-width:768px){.feedback-actions{flex-direction:column;align-items:stretch}.retry-question-btn{width:100%;justify-content:center}.question-actions{flex-direction:column;gap:1rem}.question-actions .bttn{width:100%;justify-content:center}.question-header-nav{flex-direction:column;align-items:flex-start;gap:.75rem}.question-nav-buttons{align-self:flex-end;justify-content:flex-end}}.answer-text img,.explanation-text img{max-width:100%;height:auto;max-height:350px;border-radius:var(--radius-md);corner-shape:squircle;display:block;margin:1.5rem auto;cursor:pointer;transition:transform .2s ease;cursor:zoom-in}[data-theme=dark] .answer-text img,[data-theme=dark] .explanation-text img{background:#fff;padding:1rem}.cm-figure{display:flex;flex-direction:column;align-items:center;gap:.4rem;margin:0}.cm-figcaption{font-size:var(--text-sm);color:var(--text-tertiary-color);text-align:center;max-width:36rem}.cm-subparts{display:flex;flex-direction:column;gap:.75rem;margin-top:.75rem}.cm-subpart{display:flex;gap:.6rem;align-items:baseline}.cm-subpart-label{flex:none;font-weight:600;color:var(--text-secondary-color)}.cm-subpart-text>:first-child{margin-top:0}.cm-subpart-text>:last-child{margin-bottom:0}.cm-exp{display:flex;flex-direction:column;gap:1.25rem}.cm-exp-label{display:block;font-size:var(--text-xs);font-weight:600;text-transform:uppercase;color:var(--text-tertiary-color);margin-bottom:.4rem}.cm-exp-principle{padding:.85rem 1rem;border-radius:var(--radius-md);corner-shape:squircle;background:color-mix(in oklab,var(--text-tertiary-color) 10%,transparent)}.cm-exp-principle>:last-child{margin-bottom:0}.cm-exp-steps{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:1rem}.cm-exp-step{display:flex;gap:.85rem;align-items:flex-start}.cm-exp-step-num{flex:none;width:1.75rem;height:1.75rem;border-radius:999px;display:inline-flex;align-items:center;justify-content:center;font-size:var(--text-sm);font-weight:600;color:var(--text-primary-color);background:color-mix(in oklab,var(--text-tertiary-color) 18%,transparent)}.cm-exp-step-body{min-width:0;flex:1}.cm-exp-step-title{font-weight:600;color:var(--text-primary-color);margin-bottom:.35rem}.cm-exp-example-latex,.cm-exp-step-math{overflow-x:auto}.cm-exp-step-why{color:var(--text-secondary-color)}.cm-exp-step-body>div>:last-child{margin-bottom:0}.cm-exp-choices,.cm-exp-criteria{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:.6rem}.cm-exp-choice,.cm-exp-criterion{display:flex;gap:.75rem;align-items:baseline}.cm-exp-choice-letter{flex:none;font-weight:600;min-width:1.25rem}.cm-exp-pts{flex:none;font-size:var(--text-xs);font-weight:600;padding:.15rem .5rem;border-radius:999px;background:color-mix(in oklab,var(--text-tertiary-color) 15%,transparent);color:var(--text-secondary-color)}.cm-exp-part{display:flex;flex-direction:column;gap:1rem;padding-top:1rem;border-top:1px solid color-mix(in oklab,var(--text-tertiary-color) 25%,transparent)}.cm-exp-part:first-child{padding-top:0;border-top:none}.cm-exp-part.is-sub{padding:0 0 0 1rem;border-top:none;border-left:2px solid color-mix(in oklab,var(--text-tertiary-color) 25%,transparent)}.cm-exp-part-head{font-weight:600;color:var(--text-primary-color)}.cm-exp-example{display:flex;flex-direction:column;gap:.6rem}.question-explanation.cm-exp-panel{--cm-exp-open:480ms cubic-bezier(0.16, 1, 0.3, 1);--cm-exp-close:180ms cubic-bezier(0.5, 0, 0.75, 0);display:grid;grid-template-rows:0fr;grid-template-columns:minmax(0,1fr);margin-top:0;transition:grid-template-rows var(--cm-exp-close),margin-top var(--cm-exp-close)}.question-explanation.cm-exp-panel.is-open{grid-template-rows:1fr;margin-top:1.5rem;transition:grid-template-rows var(--cm-exp-open),margin-top var(--cm-exp-open)}.cm-exp-panel-inner{min-height:0;clip-path:inset(0 -100vw 100% -100vw);transition:clip-path var(--cm-exp-close)}.cm-exp-panel.is-open>.cm-exp-panel-inner{clip-path:inset(-4rem -100vw -4rem -100vw);transition:clip-path var(--cm-exp-open)}.show-explanation-btn .cm-exp-btn-chevron{width:1rem;height:1rem;transition:transform 240ms var(--ease-out)}.show-explanation-btn.is-open .cm-exp-btn-chevron{transform:rotate(180deg)}@media (prefers-reduced-motion:reduce){.cm-exp-panel-inner,.cm-exp-panel.is-open>.cm-exp-panel-inner,.question-explanation.cm-exp-panel,.question-explanation.cm-exp-panel.is-open,.show-explanation-btn .cm-exp-btn-chevron{transition:none}}.cm-exp-tablist{display:inline-flex;gap:4px;padding:4px;border-radius:999px;background:color-mix(in oklab,var(--text-tertiary-color) 12%,transparent)}.cm-exp-tab{appearance:none;border:0;background:0 0;display:inline-flex;align-items:center;height:32px;padding:0 1rem;border-radius:999px;font:inherit;font-size:var(--text-sm);font-weight:600;color:var(--text-secondary-color);cursor:pointer;transition:background-color 160ms var(--ease-out),color 160ms var(--ease-out)}.cm-exp-tab:hover{color:var(--text-primary-color)}.cm-exp-tab.is-active{background:var(--bg-color);color:var(--text-primary-color);box-shadow:0 0 0 1px color-mix(in oklab,var(--text-tertiary-color) 18%,transparent)}.cm-exp-tab:focus-visible{outline:2px solid var(--brand-color);outline-offset:2px}.cm-exp-pane{display:flex;flex-direction:column;gap:1.25rem}.cm-exp-pane[hidden]{display:none}.mcq-choice:has(.choice-images){flex-wrap:wrap}.mcq-choice .choice-images{flex-basis:100%;margin:.25rem 0 0;padding-left:calc(1.4em + .85rem);align-items:flex-start}.mcq-choices.is-multi .mcq-choice .choice-images{padding-left:calc(1.1rem + .85rem)}.mcq-choice .choice-images .cm-figure{align-items:flex-start}.mcq-choice .choice-image{align-self:flex-start;max-width:min(100%,320px);max-height:240px;object-fit:contain}.lesson-content .cm-exp-choices,.lesson-content .cm-exp-criteria,.lesson-content .cm-exp-steps{padding-left:0;margin-bottom:0}.lesson-content .cm-exp-choices>li,.lesson-content .cm-exp-criteria>li,.lesson-content .cm-exp-steps>li{padding-bottom:0}.cm-exp-head{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:.75rem 1rem;margin-bottom:1.25rem}.cm-exp-head:not(:has(.cm-exp-tablist)){justify-content:flex-end}.cm-exp:not(.show-why) .cm-exp-why-optional{display:none}.cm-exp-controls{display:inline-flex;align-items:center;gap:.5rem;margin-left:auto}.cm-exp-tabs[data-tab=choices] .cm-exp-controls{visibility:hidden}.cm-exp-view-btn,.cm-exp-why-btn{appearance:none;border:0;background:0 0;display:inline-flex;align-items:center;justify-content:center;width:36px;height:36px;will-change:transform;border-radius:999px;color:var(--text-tertiary-color);cursor:pointer;transition:color 180ms var(--ease-out),background-color 180ms var(--ease-out),box-shadow 280ms var(--ease-out)}.cm-exp-view-btn svg,.cm-exp-why-btn svg{width:18px;height:18px}.cm-exp-view-btn:hover,.cm-exp-why-btn:hover{color:var(--text-secondary-color);background:color-mix(in oklab,var(--text-tertiary-color) 12%,transparent)}.cm-exp-view-btn:focus-visible,.cm-exp-why-btn:focus-visible{outline:2px solid var(--brand-color);outline-offset:2px}.cm-exp-why-btn{position:relative;--cm-bulb:var(--active-yellow)}.cm-exp-why-btn .cm-bulb{transition:color .7s cubic-bezier(.65, 0, .35, 1)}.cm-exp-why-btn .cm-bulb-fill{position:absolute;top:50%;left:50%;translate:-50% -50%;color:var(--cm-bulb);fill:color-mix(in oklab,var(--cm-bulb) 55%,transparent);clip-path:inset(100% 0 0 0);transition:clip-path 260ms cubic-bezier(.4, 0, 1, 1)}.cm-exp-why-btn[aria-pressed=true]{color:var(--cm-bulb);background:color-mix(in oklab,var(--cm-bulb) 10%,transparent);box-shadow:0 0 8px 0 color-mix(in oklab,var(--cm-bulb) 14%,transparent)}.cm-exp-why-btn[aria-pressed=true] .cm-bulb-fill{clip-path:inset(0 0 0 0);transition:clip-path 750ms cubic-bezier(.65, 0, .35, 1)}.cm-exp-view{display:inline-flex;padding:4px;gap:2px;border-radius:999px;background:color-mix(in oklab,var(--text-tertiary-color) 12%,transparent)}.cm-exp-view .cm-exp-view-btn{width:32px;height:32px}.cm-exp-view-btn[aria-pressed=true]{color:var(--text-primary-color);background:var(--bg-color);box-shadow:0 0 0 1px color-mix(in oklab,var(--text-tertiary-color) 18%,transparent)}.cm-exp:not([data-view=table]) .cm-exp-view-table,.cm-exp[data-view=table] .cm-exp-view-list{display:none}.cm-exp[data-view=table]:has(.cm-exp-view-table) .cm-exp-why-btn{display:none}.cm-exp-table th:first-child{width:26%}.cm-exp-table th:nth-child(2),.cm-exp-table th:nth-child(3){width:37%}.cm-exp-table td{vertical-align:top}.cm-exp-td-step{font-weight:600}.cm-exp-td-step .cm-exp-step-num{width:1.5rem;height:1.5rem;margin:0 .5rem .35rem 0;font-size:var(--text-xs)}.cm-exp-table td>:first-child{margin-top:0}.cm-exp-table td>:last-child{margin-bottom:0}@media (prefers-reduced-motion:reduce){.cm-exp-why-btn .cm-bulb,.cm-exp-why-btn .cm-bulb-fill{transition:none}}.cm-rv,.cm-rv-el{animation:cm-rv-in .5s cubic-bezier(.23,1,.32,1) both}@keyframes cm-rv-in{from{opacity:0;filter:blur(4px)}}@media (prefers-reduced-motion:reduce){.cm-rv,.cm-rv-el{animation:none}}.cm-table-scroll{max-width:100%;overflow-x:auto;overscroll-behavior-x:contain}@property --cm-fade-l{syntax:'<length>';inherits:false;initial-value:0px}@property --cm-fade-r{syntax:'<length>';inherits:false;initial-value:0px}.cm-table-scroll,.table-breakout-wrapper.scrollable{-webkit-mask-image:linear-gradient(to right,transparent,#000 var(--cm-fade-l),#000 calc(100% - var(--cm-fade-r)),transparent);mask-image:linear-gradient(to right,transparent,#000 var(--cm-fade-l),#000 calc(100% - var(--cm-fade-r)),transparent);transition:--cm-fade-l .2s ease,--cm-fade-r .2s ease}.cm-fade-start{--cm-fade-l:2.5rem}.cm-fade-end{--cm-fade-r:2.5rem}