:root{--hub-line:rgba(148,163,184,.2);--hub-panel:#0b1c2b;--hub-panel-soft:#102638;--hub-cyan:#38bdf8;--hub-green:#34d399;--hub-gold:#fbbf24;--hub-rose:#fb7185}
.class-header-actions{display:flex;align-items:center;gap:8px}.class-header-action{min-width:44px;min-height:44px;border:1px solid var(--hub-line);border-radius:14px;background:rgba(15,35,51,.8);color:#e2e8f0;display:inline-flex;align-items:center;justify-content:center;font:700 13px/1 system-ui;text-decoration:none;cursor:pointer;padding:0 12px}.class-header-action:hover,.class-header-action:focus-visible{border-color:var(--hub-cyan);color:#fff}.notice-bell{position:relative;font-size:20px}.notice-bell[data-count]:after{content:attr(data-count);position:absolute;right:-4px;top:-5px;min-width:18px;height:18px;padding:0 4px;border-radius:9px;background:#e11d48;color:#fff;font:800 10px/18px system-ui;text-align:center}.install-app-button[hidden]{display:none}.ios-install-guide{position:fixed;inset:auto 16px 90px;z-index:60;max-width:390px;margin:auto;padding:18px;border-radius:20px;border:1px solid var(--hub-line);background:#071521;color:#e2e8f0;box-shadow:0 20px 70px rgba(0,0,0,.48)}.ios-install-guide strong{display:block;font-size:17px;margin-bottom:6px}.ios-install-guide p{margin:0;color:#cbd5e1;line-height:1.5}.ios-install-guide button{position:absolute;right:10px;top:10px;width:36px;height:36px;border:0;border-radius:50%;background:#183247;color:#fff;font-size:20px}
.urgent-notice-banner{position:sticky;top:0;z-index:55;display:flex;align-items:center;justify-content:center;gap:12px;padding:11px 54px 11px 18px;background:#9f1239;color:#fff;font:750 14px/1.35 system-ui;box-shadow:0 10px 30px rgba(159,18,57,.25)}.urgent-notice-banner[hidden]{display:none}.urgent-notice-banner button{position:absolute;right:12px;width:36px;height:36px;border:0;border-radius:50%;background:rgba(255,255,255,.16);color:#fff}.notice-drawer{border:1px solid var(--hub-line);border-radius:24px;background:#071521;color:#e2e8f0;width:min(520px,calc(100% - 24px));max-height:80vh;padding:0;box-shadow:0 28px 90px rgba(0,0,0,.55)}.notice-drawer::backdrop{background:rgba(3,9,16,.74)}.notice-drawer header{position:sticky;top:0;display:flex;align-items:center;justify-content:space-between;padding:20px;border-bottom:1px solid var(--hub-line);background:#071521}.notice-drawer header strong{font-size:21px}.notice-drawer header button{width:42px;height:42px;border:0;border-radius:50%;background:#183247;color:#fff;font-size:22px}.notice-list{padding:16px;display:grid;gap:12px}.notice-item{padding:16px;border:1px solid var(--hub-line);border-radius:18px;background:#0b1c2b}.notice-item[data-priority="urgent"]{border-color:#fb7185}.notice-item[data-priority="important"]{border-color:#fbbf24}.notice-item span{display:block;color:#7dd3fc;font:800 11px/1.2 system-ui;letter-spacing:.1em}.notice-item strong{display:block;margin:7px 0;font-size:16px}.notice-item p{margin:0;color:#cbd5e1;line-height:1.45}.notice-empty{padding:24px;color:#94a3b8;text-align:center}
.course-workspace{display:flex;gap:8px;overflow:auto;margin:18px 0;padding:5px;border:1px solid var(--hub-line);border-radius:17px;background:rgba(7,21,33,.72);scrollbar-width:none}.course-workspace::-webkit-scrollbar{display:none}.course-workspace button{flex:1;min-width:112px;min-height:44px;border:0;border-radius:12px;background:transparent;color:#94a3b8;font:800 12px/1 system-ui;letter-spacing:.03em;cursor:pointer}.course-workspace button[aria-selected="true"]{background:#17354a;color:#fff;box-shadow:0 5px 18px rgba(0,0,0,.2)}.course-workspace-panel{margin:0 0 18px;padding:18px;border:1px solid var(--hub-line);border-radius:22px;background:var(--hub-panel)}.course-workspace-panel[hidden]{display:none}.workspace-topic-list,.workspace-file-list,.workspace-progress-list{display:grid;gap:10px}.workspace-topic-list a,.workspace-file-row,.workspace-progress-row{display:flex;align-items:center;gap:12px;padding:13px;border:1px solid var(--hub-line);border-radius:15px;background:#0e2334;color:#e2e8f0;text-decoration:none}.workspace-topic-list a div,.workspace-file-row div,.workspace-progress-row span{min-width:0;flex:1}.workspace-topic-list strong,.workspace-file-row strong,.workspace-progress-row strong{display:block}.workspace-topic-list small,.workspace-file-row small,.workspace-progress-row small{display:block;color:#94a3b8;margin-top:4px}.workspace-file-row input,.workspace-progress-row input{width:20px;height:20px;accent-color:var(--hub-cyan)}.workspace-file-actions{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:14px}.workspace-file-actions button,.workspace-file-row a{min-height:42px;border:1px solid var(--hub-line);border-radius:12px;background:#17354a;color:#fff;padding:0 14px;font-weight:750;text-decoration:none;display:inline-flex;align-items:center}.workspace-progress-meter{height:9px;border-radius:99px;background:#172a39;overflow:hidden;margin:12px 0}.workspace-progress-meter i{display:block;height:100%;background:linear-gradient(90deg,var(--hub-cyan),var(--hub-green));width:0;transition:width .25s}.workspace-progress-summary{color:#cbd5e1}
.dated-lesson-panel.lesson-2026{display:grid;gap:18px}.lesson-hero-2026{position:relative;overflow:hidden;display:grid;grid-template-columns:minmax(0,1.5fr) minmax(240px,.7fr);gap:24px;padding:28px;border:1px solid var(--hub-line);border-radius:28px;background:radial-gradient(circle at 100% 0,rgba(56,189,248,.16),transparent 45%),linear-gradient(145deg,#0e293c,#091722)}.lesson-hero-2026:before{content:"";position:absolute;inset:0;border-top:3px solid var(--lesson-accent,var(--hub-cyan));pointer-events:none}.lesson-hero-2026 span,.lesson-kicker{color:var(--lesson-accent,var(--hub-cyan));font:800 12px/1.2 system-ui;letter-spacing:.12em}.lesson-hero-2026 h3{margin:10px 0;color:#fff;font-size:clamp(26px,4vw,46px);line-height:1.04}.lesson-hero-2026 p{margin:0;color:#cbd5e1;font-size:16px;line-height:1.58}.lesson-hero-facts{display:grid;gap:10px}.lesson-hero-facts div{padding:14px;border:1px solid var(--hub-line);border-radius:16px;background:rgba(7,21,33,.68)}.lesson-hero-facts small{display:block;color:#94a3b8;font-size:11px;letter-spacing:.08em}.lesson-hero-facts strong{display:block;margin-top:5px;color:#fff;font-size:15px;line-height:1.3}
.lesson-section-tabs{position:sticky;top:10px;z-index:12;display:flex;gap:7px;overflow:auto;padding:6px;border:1px solid var(--hub-line);border-radius:18px;background:rgba(7,21,33,.94);backdrop-filter:blur(14px);scrollbar-width:none}.lesson-section-tabs::-webkit-scrollbar{display:none}.lesson-section-tabs button{flex:0 0 auto;min-height:44px;border:0;border-radius:12px;background:transparent;color:#94a3b8;padding:0 14px;font:800 12px/1 system-ui;white-space:nowrap}.lesson-section-tabs button[aria-selected="true"]{background:var(--lesson-accent,var(--hub-cyan));color:#06131d}.lesson-tab-panel{border:1px solid var(--hub-line);border-radius:24px;background:var(--hub-panel);padding:clamp(18px,3vw,28px)}.lesson-tab-panel[hidden]{display:none}.lesson-tab-panel>header{margin-bottom:18px}.lesson-tab-panel>header span{color:var(--lesson-accent,var(--hub-cyan));font:800 11px/1.2 system-ui;letter-spacing:.13em}.lesson-tab-panel>header h3{color:#fff;margin:8px 0 0;font-size:clamp(22px,3vw,30px)}.mini-toc{display:flex;flex-wrap:wrap;gap:8px;margin:0 0 20px;padding:0;list-style:none}.mini-toc a{display:inline-flex;align-items:center;min-height:38px;padding:0 12px;border:1px solid var(--hub-line);border-radius:99px;color:#bae6fd;text-decoration:none;font-size:12px;font-weight:700}.concept-grid-2026{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.concept-card-2026{padding:18px;border:1px solid var(--hub-line);border-radius:19px;background:var(--hub-panel-soft)}.concept-card-2026 span{color:var(--lesson-accent,var(--hub-cyan));font:800 11px/1 system-ui;letter-spacing:.1em}.concept-card-2026 h4{margin:8px 0;color:#fff;font-size:18px}.concept-card-2026 p,.concept-card-2026 li{color:#cbd5e1;line-height:1.5}.concept-card-2026 p{margin:0}.concept-card-2026 ul{margin:8px 0 0;padding-left:20px}.quick-sheet{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}.quick-sheet article{padding:18px;border-radius:18px;background:#102638;border:1px solid var(--hub-line)}.quick-sheet span{color:var(--lesson-accent,var(--hub-cyan));font:800 11px/1 system-ui}.quick-sheet strong{display:block;color:#fff;margin:8px 0;font-size:17px}.quick-sheet small{color:#cbd5e1;line-height:1.45}.ultra-sheet{display:grid;gap:10px;counter-reset:ultra}.ultra-sheet li{list-style:none;display:grid;grid-template-columns:42px 1fr;align-items:center;gap:12px;padding:13px;border:1px solid var(--hub-line);border-radius:15px;background:#102638;color:#e2e8f0}.ultra-sheet li:before{counter-increment:ultra;content:counter(ultra,decimal-leading-zero);display:grid;place-items:center;width:38px;height:38px;border-radius:12px;background:var(--lesson-accent,var(--hub-cyan));color:#06131d;font-weight:900}.lesson-materials{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}.lesson-file-card{overflow:hidden;border:1px solid var(--hub-line);border-radius:20px;background:#102638}.lesson-file-card img{display:block;width:100%;aspect-ratio:16/10;object-fit:cover;background:#071521}.lesson-file-card div{padding:16px}.lesson-file-card span{color:var(--lesson-accent,var(--hub-cyan));font:800 11px/1 system-ui;letter-spacing:.1em}.lesson-file-card strong{display:block;margin:8px 0;color:#fff}.lesson-file-card small{display:block;color:#94a3b8;line-height:1.45}.lesson-file-card a,.lesson-file-card button{display:inline-flex;align-items:center;justify-content:center;min-height:44px;margin:12px 7px 0 0;padding:0 14px;border:1px solid var(--hub-line);border-radius:12px;background:#183a50;color:#fff;font-weight:800;text-decoration:none}.board-gallery{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.board-gallery button{position:relative;overflow:hidden;border:1px solid var(--hub-line);border-radius:20px;background:#071521;padding:0;cursor:zoom-in}.board-gallery img{display:block;width:100%;height:auto}.board-gallery button span{position:absolute;left:10px;bottom:10px;padding:8px 11px;border-radius:10px;background:rgba(7,21,33,.9);color:#fff;font:750 12px/1 system-ui}.ai-resource-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.ai-resource-grid details{border:1px solid var(--hub-line);border-radius:18px;background:#102638;padding:16px}.ai-resource-grid summary{cursor:pointer;color:#fff;font-weight:800;min-height:30px}.ai-resource-grid p,.ai-resource-grid li{color:#cbd5e1;line-height:1.52}.ai-prompt{grid-column:1/-1}.ai-prompt pre{white-space:pre-wrap;word-break:break-word;padding:15px;border-radius:14px;background:#071521;color:#bae6fd;font:13px/1.5 ui-monospace,monospace}.confidence-chip{display:inline-flex;margin-top:8px;padding:6px 9px;border-radius:99px;background:#17354a;color:#bae6fd;font:800 10px/1 system-ui}.lesson-source-note{padding:14px 16px;border-left:3px solid var(--lesson-accent,var(--hub-cyan));border-radius:0 14px 14px 0;background:#102638;color:#cbd5e1;line-height:1.5}.lesson-source-note b{color:#fff}
.image-lightbox{border:1px solid var(--hub-line);border-radius:22px;background:#071521;padding:12px;max-width:min(1100px,calc(100% - 24px));max-height:92vh}.image-lightbox::backdrop{background:rgba(0,0,0,.88)}.image-lightbox img{display:block;max-width:100%;max-height:82vh;border-radius:14px}.image-lightbox button{position:absolute;right:18px;top:18px;width:44px;height:44px;border:1px solid rgba(255,255,255,.3);border-radius:50%;background:rgba(7,21,33,.85);color:#fff;font-size:24px}.group-activity-card{padding:18px;border:1px solid var(--hub-line);border-radius:20px;background:#102638}.group-activity-card header{display:flex;justify-content:space-between;gap:12px}.group-activity-card h4{margin:5px 0;color:#fff}.group-activity-card p{color:#cbd5e1}.group-activity-card input,.group-activity-card select{min-height:44px;border:1px solid var(--hub-line);border-radius:12px;background:#071521;color:#fff;padding:0 12px}.group-activity-card button{min-height:44px;border:0;border-radius:12px;background:var(--hub-cyan);color:#06131d;padding:0 16px;font-weight:850}.class-hub-live{display:grid;gap:12px;margin:16px 0}.class-hub-live a.live-task{display:block;text-decoration:none}.live-task{padding:16px;border:1px solid var(--hub-line);border-radius:18px;background:#102638}.live-task span{color:#7dd3fc;font:800 11px/1 system-ui}.live-task strong{display:block;color:#fff;margin:8px 0}.live-task p{margin:0;color:#cbd5e1}.no-new-nutrition{display:flex;gap:12px;align-items:flex-start;padding:14px 16px;margin:14px 0;border:1px solid rgba(251,191,36,.35);border-radius:16px;background:rgba(251,191,36,.07);color:#fde68a}
@media(max-width:780px){.lesson-hero-2026{grid-template-columns:1fr;padding:20px}.concept-grid-2026,.quick-sheet,.lesson-materials,.ai-resource-grid{grid-template-columns:1fr}.ai-prompt{grid-column:auto}.board-gallery{grid-template-columns:1fr}.lesson-section-tabs{top:6px}.class-header-actions .manage-label{display:none}}
@media(max-width:430px){.class-header-inner{gap:7px}.class-header-actions{grid-column:1/-1;justify-self:start;gap:5px}.class-header-action{min-width:42px;width:42px;padding:0}.class-header-actions .manage-link{display:none}.class-scope{display:none}.class-dashboard .dashboard-next{min-height:116px}.dated-lesson-panel.lesson-2026{gap:12px;min-width:0;max-width:100%}.lesson-hero-2026,.lesson-tab-panel{min-width:0;max-width:100%;border-radius:18px;padding:16px}.lesson-hero-2026 h3{font-size:27px}.lesson-hero-2026 p{font-size:14px}.lesson-section-tabs{max-width:100%;margin-inline:0;border-radius:14px}.lesson-section-tabs button{min-height:42px;padding:0 11px;font-size:11px}.concept-card-2026,.quick-sheet article{padding:14px}.course-workspace{max-width:100%;margin-inline:0}.course-workspace button{min-width:96px;font-size:11px}.workspace-file-row{align-items:flex-start;flex-wrap:wrap}.workspace-file-row a{width:100%;justify-content:center}.notice-drawer{width:calc(100% - 16px)}.urgent-notice-banner{font-size:12px}}
@media(max-width:360px){.class-brand span small,.class-language-switcher label{display:none}.class-language-switcher select{max-width:62px;padding-inline:6px}.lesson-hero-2026 h3{font-size:24px}.lesson-hero-facts strong{font-size:13px}.mini-toc{gap:5px}.mini-toc a{font-size:10px;padding:0 9px}.ultra-sheet li{grid-template-columns:34px 1fr;font-size:13px}.ultra-sheet li:before{width:32px;height:32px;font-size:12px}}
@media(prefers-reduced-motion:reduce){.workspace-progress-meter i{transition:none}}
.lesson-tab-panel.course-chapter-2026{border:0;border-radius:0;background:transparent;padding:clamp(14px,2.5vw,28px) clamp(8px,2vw,22px);box-shadow:none}.course-chapter-2026>header{max-width:820px;margin:0 auto 24px}.course-chapter-2026>header h3{max-width:22ch;margin-top:10px;font-size:clamp(30px,4vw,44px);line-height:1.08;letter-spacing:-.025em}.course-chapter-lead{max-width:72ch;margin:18px 0 0;color:#cbd5e1;font-size:clamp(16px,1.8vw,19px);line-height:1.72}.course-chapter-index{max-width:900px;margin:0 auto;padding:18px 0;border-block:1px solid var(--hub-line)}.course-chapter-index ol{display:flex;flex-wrap:wrap;gap:10px 22px;margin:0;padding:0;list-style:none;counter-reset:chapter-index}.course-chapter-index li{display:flex;align-items:baseline;gap:7px;counter-increment:chapter-index}.course-chapter-index li:before{content:counter(chapter-index,decimal-leading-zero);color:var(--lesson-accent,var(--hub-cyan));font:800 10px/1 system-ui;letter-spacing:.08em}.course-chapter-index a{color:#bae6fd;text-decoration:none;font:750 13px/1.3 system-ui;border-bottom:1px solid transparent}.course-chapter-index a:hover,.course-chapter-index a:focus-visible{color:#fff;border-bottom-color:currentColor;outline:none}.course-chapter-body{max-width:780px;margin:14px auto 0}.course-chapter-section{scroll-margin-top:96px;padding:clamp(34px,5vw,54px) 0;border-bottom:1px solid var(--hub-line)}.course-chapter-section:last-child{border-bottom:0}.course-chapter-step{margin:0 0 10px!important;color:var(--lesson-accent,var(--hub-cyan))!important;font:850 11px/1.2 system-ui!important;letter-spacing:.14em}.course-chapter-section h4,.course-chapter-visuals h4{max-width:27ch;margin:0 0 18px;color:#fff;font-size:clamp(23px,3vw,31px);line-height:1.18;letter-spacing:-.015em}.course-chapter-section p:not(.course-chapter-step),.course-chapter-visuals>p:not(.course-chapter-step){max-width:70ch;margin:0;color:#cbd5e1;font-size:clamp(15px,1.6vw,17px);line-height:1.76}.course-chapter-section p:not(.course-chapter-step)+p{margin-top:16px}.course-chapter-visuals{max-width:900px;margin:14px auto 0;padding:clamp(34px,5vw,54px) 0}.course-chapter-visuals .board-gallery{margin-top:24px}.course-chapter-safety{max-width:780px;margin:8px auto 30px;padding:28px 0;border-block:1px solid rgba(251,191,36,.34);background:linear-gradient(90deg,rgba(251,191,36,.06),transparent)}.course-chapter-safety>div,.course-chapter-safety>ul{padding-inline:18px}.course-chapter-safety span{color:#fbbf24;font:850 11px/1.2 system-ui;letter-spacing:.13em}.course-chapter-safety h3{margin:8px 0 0;color:#fff;font-size:clamp(21px,2.6vw,28px)}.course-chapter-safety ul{margin:18px 0 0;padding-left:38px;color:#cbd5e1;line-height:1.65}.course-chapter-safety li+li{margin-top:7px}.course-chapter-2026>.group-activity-card,.course-chapter-2026>.lesson-source-note{max-width:900px;margin-inline:auto}.course-chapter-2026>.group-activity-card{margin-top:28px}
@media(max-width:780px){.course-chapter-2026>header h3{max-width:100%}.course-chapter-index ol{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px 18px}.course-chapter-section,.course-chapter-visuals{padding-block:34px}}
@media(max-width:430px){.lesson-tab-panel.course-chapter-2026{padding:10px 2px 18px}.course-chapter-2026>header{margin-bottom:20px}.course-chapter-2026>header h3{font-size:28px;line-height:1.12}.course-chapter-lead{margin-top:15px;font-size:16px;line-height:1.68}.course-chapter-index{padding:15px 0}.course-chapter-index ol{gap:11px 12px}.course-chapter-index a{font-size:12px}.course-chapter-section{scroll-margin-top:82px;padding:32px 0}.course-chapter-section h4,.course-chapter-visuals h4{font-size:23px;line-height:1.22;margin-bottom:15px}.course-chapter-section p:not(.course-chapter-step),.course-chapter-visuals>p:not(.course-chapter-step){font-size:16px;line-height:1.72}.course-chapter-step{font-size:10px!important}.course-chapter-visuals{padding:32px 0}.course-chapter-safety{padding:24px 0}.course-chapter-safety>div,.course-chapter-safety>ul{padding-inline:12px}.course-chapter-safety>ul{padding-left:32px}.course-chapter-2026>.group-activity-card{border-radius:16px;padding:15px}}
.course-chapter-section{scroll-margin-top:190px}
@media(max-width:430px){.course-chapter-section{scroll-margin-top:124px}}