:root{--c-primary:#0556f9;--c-secondary:#111d45;--c-accent:#22c1a4;--primary-dark:color-mix(in srgb, var(--c-primary) 78%, black);--primary-soft:color-mix(in srgb, var(--c-primary) 9%, white);--primary-on-dark:color-mix(in srgb, var(--c-primary) 72%, white);--accent-soft:color-mix(in srgb, var(--c-accent) 14%, white);--accent-ink:color-mix(in srgb, var(--c-accent) 52%, black);--dark:var(--c-secondary);--dark-2:color-mix(in srgb, var(--c-secondary) 86%, var(--c-primary));--on-dark:#fff;--on-dark-soft:color-mix(in srgb, white 68%, var(--c-secondary));--on-dark-line:#ffffff1f;--code-text:color-mix(in srgb, var(--c-accent) 28%, white);--surface:#fff;--surface-alt:#f4f6fb;--text:var(--c-secondary);--text-soft:#5b6478;--border:#e3e7f1;--danger:#c0392b;--danger-soft:#fdecea;--warning:#8a5300;--warning-soft:#fff4e0;--radius:14px;--radius-sm:8px;--shadow:0 8px 24px color-mix(in srgb, var(--c-secondary) 8%, transparent);--focus:0 0 0 3px color-mix(in srgb, var(--c-primary) 35%, transparent);--max-width:1120px;font-size:16px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{color:var(--text);background:var(--surface-alt);-webkit-font-smoothing:antialiased;margin:0;font-family:Inter,Segoe UI,Helvetica Neue,Arial,sans-serif;line-height:1.6}img{max-width:100%;display:block}a{color:var(--c-primary);text-decoration:none}a:hover{text-decoration:underline}ul{margin:0;padding-left:0;list-style:none}.container{width:100%;max-width:var(--max-width);margin:0 auto;padding:0 20px}section{padding:64px 0}section.tight{padding:40px 0}h1,h2,h3,h4{margin:0 0 16px;font-weight:700;line-height:1.25}h1{font-size:clamp(1.9rem,4vw,2.8rem)}h2{font-size:clamp(1.5rem,3vw,2.1rem)}h3{font-size:1.2rem}p{color:var(--text-soft);margin:0 0 16px}.eyebrow{letter-spacing:.06em;text-transform:uppercase;color:var(--c-primary);background:var(--accent-soft);border-radius:999px;margin-bottom:14px;padding:4px 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a.active{background:var(--c-primary);color:#fff}.nav-right{align-items:center;gap:10px;display:flex}.nav-toggle{background:var(--on-dark-line);cursor:pointer;border:none;border-radius:8px;flex-direction:column;justify-content:center;gap:5px;width:38px;height:38px;display:none}.nav-toggle span{background:#fff;width:18px;height:2px;margin:0 auto;display:block}@media (width<=860px){.nav-toggle{display:flex}.nav-links{background:var(--dark);flex-direction:column;align-items:stretch;padding:10px 20px 18px;display:none;position:absolute;top:100%;left:0;right:0}.nav-links.open{display:flex}.nav-links a{padding:12px 14px}}.hero{background:linear-gradient(160deg, var(--dark) 0%, var(--dark-2) 100%);color:#fff;padding:72px 0}.hero p{color:#ffffffe0;max-width:640px;font-size:1.1rem}.hero-stats{flex-wrap:wrap;gap:28px;margin-top:36px;display:flex}.hero-stats div{min-width:110px}.hero-stats strong{color:var(--c-accent);font-size:1.8rem;display:block}.hero-stats span{color:#fffc;font-size:.85rem;font-weight:600}.grid{grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:22px;display:grid}.grid-2{grid-template-columns:repeat(auto-fit,minmax(320px,1fr))}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:26px}.card h3{margin-bottom:10px}.card .icon{background:var(--accent-soft);border-radius:12px;justify-content:center;align-items:center;width:44px;height:44px;margin-bottom:16px;font-size:1.3rem;display:flex}.card .teacher-photo{object-fit:cover;object-position:center 20%;border-radius:var(--radius-sm);width:100%;height:220px;margin-bottom:16px}.month-block{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);margin-bottom:24px;overflow:hidden}.month-head{background:var(--dark);color:#fff;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:16px;padding:22px 26px;display:flex}.month-head .tag{background:var(--c-accent);color:var(--dark);text-transform:uppercase;border-radius:999px;padding:4px 12px;font-size:.78rem;font-weight:800}.month-head h2{color:#fff;margin:0;font-size:1.3rem}.month-head p{color:#ffffffa6;margin:4px 0 0;font-size:.92rem}.week{border-top:1px solid var(--border)}.week>summary{cursor:pointer;background:var(--surface-alt);justify-content:space-between;align-items:center;padding:16px 26px;font-weight:700;list-style:none;display:flex}.week>summary::-webkit-details-marker{display:none}.week>summary:after{content:"+";color:var(--c-primary);font-size:1.3rem;font-weight:400}.week[open]>summary:after{content:"−"}.lesson-list{padding:6px 26px 18px}.lesson{border-bottom:1px dashed var(--border);border-radius:var(--radius-sm);align-items:flex-start;gap:14px;padding:12px 0;transition:background .15s;display:flex}a.lesson,a.lesson:hover{color:inherit;text-decoration:none}a.lesson:hover{background:var(--surface-alt)}a.lesson:hover .body 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.num{background:var(--c-primary);color:#fff}.container-wide{max-width:1360px}.lesson-page{--sticky-top:72px}.shell .lesson-page{--sticky-top:58px}.lesson-layout{grid-template-columns:minmax(0,1fr) 360px;align-items:start;gap:28px;display:grid}.lesson-layout.list-hidden{grid-template-columns:minmax(0,1fr)}.lesson-layout.list-hidden .course-sidebar{display:none}.lesson-main{min-width:0}.lesson-main .back-link{margin-bottom:14px;font-weight:600;display:inline-block}.lesson-stage{margin-bottom:4px}.video-frame{aspect-ratio:16/9;border-radius:var(--radius);width:100%;box-shadow:var(--shadow);background:#000;position:relative;overflow:hidden}.video-frame iframe{border:0;width:100%;height:100%;position:absolute;inset:0}.video-fallback{text-align:right;margin:8px 0 0;font-size:.85rem}.lesson-stage-soon{border-radius:var(--radius);background:linear-gradient(120deg, var(--dark), var(--dark-2));box-shadow:var(--shadow);align-items:center;gap:20px;padding:18px 28px;display:flex}.lesson-stage-soon img{background:#fff;border-radius:50%;flex:none;width:76px;height:auto;padding:6px}.lesson-stage-title{color:var(--on-dark);margin:0 0 4px;font-size:1.05rem;font-weight:700}.lesson-stage-hint{color:var(--on-dark-soft);margin:0;font-size:.92rem}.lesson-titlebar{flex-wrap:wrap;justify-content:space-between;align-items:flex-end;gap:16px 24px;margin:22px 0 10px;display:flex}.lesson-titlebar h1{margin:0;font-size:clamp(1.5rem,2.6vw,2.1rem)}.lesson-crumb{flex-wrap:wrap;align-items:center;gap:8px;margin-bottom:8px;display:flex}.lesson-crumb .eyebrow{margin:0}.lesson-crumb-meta{color:var(--text-soft);font-size:.9rem}.lesson-actions{flex-wrap:wrap;align-items:center;gap:10px;display:flex}.lesson-done:empty,.course-toggle{display:none}.lesson-layout.list-hidden .course-toggle{display:inline-flex}.lesson-tabs{top:var(--sticky-top);z-index:20;scrollbar-width:none;background:var(--surface-alt);border-bottom:1px solid 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a:hover{border-color:var(--c-primary);text-decoration:none;transform:translateY(-2px)}.lesson-nav a.next{text-align:right}.lesson-nav .dir{text-transform:uppercase;letter-spacing:.05em;color:var(--c-primary);margin-bottom:4px;font-size:.76rem;font-weight:800;display:block}.lesson-nav .ttl{font-weight:700}.lesson-nav .lesson-nav-empty{flex:1;min-width:200px}.lesson-lock{text-align:center;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);margin-top:22px;padding:40px 28px}.lesson-lock-icon{background:var(--primary-soft);border-radius:50%;place-items:center;width:72px;height:72px;margin:0 auto 16px;font-size:2rem;display:grid}.lesson-lock-login .lesson-lock-icon{background:var(--accent-soft)}.lesson-lock h2{margin-bottom:10px;font-size:1.35rem}.lesson-lock p{max-width:520px;margin:0 auto 22px}.lesson-lock-actions{flex-wrap:wrap;justify-content:center;gap:10px;display:flex}.lesson-skeleton{background:linear-gradient(90deg, var(--surface) 0%, var(--surface-alt) 50%, var(--surface) 100%);background-size:200% 100%;min-height:420px;animation:1.2s ease-in-out infinite skeleton}@keyframes skeleton{0%{background-position:100% 0}to{background-position:-100% 0}}@media (prefers-reduced-motion:reduce){.lesson-skeleton{animation:none}}.course-sidebar{top:calc(var(--sticky-top) + 16px);max-height:calc(100vh - var(--sticky-top) - 32px);background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);flex-direction:column;display:flex;position:sticky;overflow:hidden}.course-sidebar-head{border-bottom:1px solid var(--border);justify-content:space-between;align-items:flex-start;gap:12px;padding:16px 16px 12px 18px;display:flex}.course-sidebar-head h2{margin:0;font-size:1.05rem}.course-sidebar-head p{margin:2px 0 0;font-size:.84rem}.icon-btn{width:34px;height:34px;color:var(--text-soft);cursor:pointer;background:0 0;border:0;border-radius:50%;flex:none;font-size:1rem}.icon-btn:hover{background:var(--surface-alt);color:var(--text)}.icon-btn:focus-visible{box-shadow:var(--focus);outline:none}.course-sidebar-bar{background:var(--surface-alt);height:4px}.course-sidebar-bar span{background:var(--c-accent);height:100%;display:block}.course-sidebar-list{overscroll-behavior:contain;flex:1;overflow-y:auto}.course-month{border-bottom:1px solid var(--border)}.course-month>summary{background:var(--surface-alt);cursor:pointer;z-index:1;border-bottom:1px solid var(--border);justify-content:space-between;align-items:flex-start;gap:10px;padding:14px 18px;font-size:.92rem;font-weight:700;list-style:none;display:flex;position:sticky;top:0}.course-month>summary::-webkit-details-marker{display:none}.course-month>summary:after{content:"⌄";color:var(--text-soft);transition:transform .15s}.course-month[open]>summary:after{transform:rotate(180deg)}.course-month-title{flex:1}.course-month-meta{color:var(--text-soft);flex:none;padding-top:2px;font-size:.8rem;font-weight:600}.course-week{letter-spacing:.06em;text-transform:uppercase;color:var(--text-soft);padding:10px 18px 4px;font-size:.72rem;font-weight:800}.course-item{color:var(--text);border-left:3px solid #0000;align-items:flex-start;gap:12px;padding:9px 18px 9px 15px;font-size:.9rem;line-height:1.4;display:flex}.course-item:hover{background:var(--surface-alt);text-decoration:none}.course-item.current{background:var(--primary-soft);border-left-color:var(--c-primary);font-weight:700}.course-check{border:2px solid color-mix(in srgb, var(--text-soft) 55%, white);color:#fff;border-radius:4px;flex:none;place-items:center;width:18px;height:18px;margin-top:1px;font-size:.72rem;font-weight:800;display:grid}.course-item.done .course-check{background:var(--c-accent);border-color:var(--c-accent)}.course-item.locked{color:var(--text-soft)}.course-item.locked .course-check{border:0;font-size:.8rem}.course-item-text{flex-direction:column;gap:3px;min-width:0;display:flex}.course-item-tag{color:var(--c-primary);background:var(--primary-soft);border-radius:999px;align-self:flex-start;padding:1px 8px;font-size:.7rem;font-weight:800}.course-item.current .course-item-tag{background:var(--surface)}.course-scrim{display:none}@media (width<=1100px){.lesson-layout,.lesson-layout.list-hidden{grid-template-columns:minmax(0,1fr)}.course-toggle{display:inline-flex}.lesson-layout .course-sidebar,.lesson-layout.list-hidden .course-sidebar{z-index:300;visibility:hidden;border:0;border-radius:0;width:min(380px,92vw);max-height:none;transition:transform .2s;display:flex;position:fixed;top:0;bottom:0;right:0;transform:translate(105%)}.lesson-layout.drawer-open .course-sidebar{visibility:visible;transform:none}.lesson-layout.drawer-open .course-scrim{z-index:290;background:color-mix(in srgb, var(--dark) 45%, transparent);border:0;display:block;position:fixed;inset:0}}@media (width>=1101px) and (width<=1400px){.shell .lesson-layout,.shell .lesson-layout.list-hidden{grid-template-columns:minmax(0,1fr)}.shell .course-toggle{display:inline-flex}.shell .lesson-layout .course-sidebar,.shell .lesson-layout.list-hidden .course-sidebar{z-index:300;visibility:hidden;border:0;border-radius:0;width:380px;max-height:none;transition:transform .2s;display:flex;position:fixed;top:0;bottom:0;right:0;transform:translate(105%)}.shell .lesson-layout.drawer-open .course-sidebar{visibility:visible;transform:none}.shell .lesson-layout.drawer-open .course-scrim{z-index:290;background:color-mix(in srgb, var(--dark) 45%, transparent);border:0;display:block;position:fixed;inset:0}}@media (width<=600px){.lesson-panel{margin-left:-4px;margin-right:-4px;padding:18px 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img{width:100%;height:auto;display:block}.guide-content .scene-frame figcaption{color:#4b5060;text-align:center;border-top:1px solid #efe8d6;padding:6px 10px 8px;font-size:.82rem}.guide-content .scene-talk{align-items:flex-end;gap:10px;margin-top:14px;display:flex}.guide-content .scene-mascot{flex:none;width:104px;height:auto}.guide-content .scene-bubble{background:#fff;border:2px solid #1b1b1f;border-radius:16px;flex:1;margin:0 0 30px;padding:12px 14px;font-size:.95rem;line-height:1.55;position:relative}.guide-content .scene-bubble:before{content:"";border:7px solid #0000;border-left:0;border-right:12px solid #1b1b1f;position:absolute;bottom:14px;left:-12px}.guide-content .scene-bubble:after{content:"";border:5px solid #0000;border-left:0;border-right:9px solid #fff;position:absolute;bottom:16px;left:-8px}.guide-content .scene-bubble strong:first-child{color:#0556f9}.guide-content .scene code{color:#111d45;background:#eef3ff}.guide-content .figure{margin:0 0 20px}.guide-content .figure img{border:1px solid var(--border);border-radius:var(--radius-sm);background:#fff;width:100%;height:auto;display:block}.guide-content .figure figcaption{color:var(--text-soft);text-align:center;margin-top:6px;font-size:.82rem}.guide-content .summary-list li{margin-bottom:6px}@media (width<=560px){.guide-content .scene{padding:12px}.guide-content .scene-talk{flex-direction:column;align-items:flex-start;gap:4px}.guide-content .scene-mascot{order:2;width:70px;margin-left:6px}.guide-content .scene-bubble{margin:0 0 12px;font-size:.92rem}.guide-content .scene-bubble:before{border:7px solid #0000;border-top:12px solid #1b1b1f;border-bottom:0;bottom:-12px;left:30px}.guide-content .scene-bubble:after{border:5px solid #0000;border-top:9px solid #fff;border-bottom:0;bottom:-8px;left:32px}}.guide-content h4{align-items:center;gap:10px;margin-top:30px;margin-bottom:12px;font-size:1.08rem;display:flex}.guide-content h4:first-child{margin-top:0}.guide-content 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