/* R3 platform shell. Existing app.css keeps the experiment frame and offline sheet. */
:root{--paper:#f8f7f1;--surface:#fffefa;--teal:#287b6c;--deep:#193f36;--ink:#29443b;--muted:#879087;--line:#e6e7dc;font-family:"Microsoft YaHei UI","Microsoft YaHei","PingFang SC",sans-serif}
body{background:var(--paper);font-size:14px}.app-shell{display:block;max-width:none;margin:0;padding:0}.platform-body{margin-left:218px;min-height:100vh}.desktop-sidebar{display:flex;flex-direction:column;position:fixed;inset:0 auto 0 0;width:218px;padding:31px 17px 18px;background:#fbfaf5;border-right:1px solid var(--line);z-index:10}.sidebar-brand{padding:0 4px 32px;gap:9px}.sidebar-brand>img{width:44px;height:44px;border-radius:12px}.sidebar-brand>span{font-size:20px;letter-spacing:.035em}.sidebar-brand small{font-size:9px;letter-spacing:.09em;margin-top:5px}.sidebar-nav{display:flex;flex-direction:column;gap:6px}.sidebar-nav button,.sidebar-bottom>button{display:flex;align-items:center;gap:12px;width:100%;padding:13px 16px;border-radius:10px;font-size:14px;min-height:48px;text-align:left;color:#607469}.sidebar-nav button svg,.sidebar-bottom>button svg{width:21px;height:21px}.sidebar-nav button:hover,.sidebar-bottom>button:hover{background:#edf1e7}.sidebar-nav button[aria-current="page"],.sidebar-bottom>button[aria-current="page"]{background:#e5eee4;color:var(--teal);font-weight:700}.nav-label{font-size:10px;letter-spacing:.14em;color:#a0a69b;margin:25px 0 6px 17px}.sidebar-bottom{position:static;display:flex;flex-direction:column;gap:3px;inset:auto;margin-top:auto;padding:28px 0 0;border:0;background:transparent}.sidebar-note{display:flex;align-items:center;justify-content:center;gap:6px;font-size:10px;color:#9aa48e;padding-top:22px;margin-top:15px;border-top:1px solid var(--line)}.sidebar-note i,.scene-caption i{width:5px;height:5px;border-radius:100%;background:#87ab7c}.app-header{min-height:91px;padding:19px 36px;gap:25px;border-bottom:1px solid var(--line);background:#fbfaf6;display:flex;align-items:center;position:relative}.header-context{display:flex;gap:12px;align-items:center;white-space:nowrap;flex:none;font-size:12px;color:#929b8c}.header-context #page-title{font-size:15px;color:#496151}.context-dot{color:#c4c9b8}.search-field{display:flex;align-items:center;gap:10px;padding:11px 15px;flex:1;max-width:450px;margin-left:auto;border:1px solid #e0e4d6;background:#f6f6ef;border-radius:11px;min-width:100px;height:44px}.search-field>svg{width:17px;height:17px;color:#8a9989}.search-field input{width:100%;border:0;outline:0;background:transparent;color:var(--ink);font-size:12px}.search-field input::placeholder{color:#a3aa9e}.search-field button{font-size:20px;color:#85937f;padding:0 3px}.header-actions{display:flex;align-items:center;gap:9px}.account-entry{display:flex;align-items:center;gap:8px;white-space:nowrap;font-size:12px;padding:8px 10px;border-radius:10px;max-width:150px}.account-entry>span{overflow:hidden;text-overflow:ellipsis}.account-entry svg{width:19px;height:19px}.account-entry:hover{background:#e8eee2}.mobile-brand{display:none}main#main-content{padding:28px 36px 20px;max-width:1370px;margin:0 auto}.breadcrumbs{display:flex;align-items:center;gap:10px;margin:0 0 24px;font-size:11px;color:#b3b8a7}.breadcrumb-button{font-size:11px;color:#8d9a85;padding:3px 0}.breadcrumb-current{color:#566d56}.home-hero{display:grid;grid-template-columns:1.05fr 1fr;background:#edf0df;border:1px solid #e3e8d6;border-radius:18px;min-height:278px;overflow:hidden;position:relative}.hero-copy{padding:32px 32px 31px;z-index:1}.eyebrow{font-size:9px;letter-spacing:.14em;color:#8a9b7a;font-weight:500}.home-hero h1{font-size:32px;line-height:1.5;font-weight:650;letter-spacing:.025em;margin:15px 0 8px;color:#315443}.home-hero h1 em{font-style:normal;color:#2c7c67}.hero-copy>p{font-size:12px;margin:0 0 21px;color:#819078}.primary-button,.secondary-button{display:inline-flex;align-items:center;justify-content:center;gap:19px;min-height:41px;font-size:12px;border-radius:8px;padding:10px 19px;font-weight:600}.primary-button{background:#2c7f6b;color:#fff}.primary-button:hover{background:#226a59}.primary-button>span{font-size:17px}.secondary-button{background:#f2f4e9;border:1px solid #dfe5d3;color:#51785a}.secondary-button:disabled{cursor:default}.hero-scene{position:relative;min-height:278px;background:#f5f3e8;overflow:hidden}.hero-scene>#hero-cover{width:100%;height:100%;position:absolute;inset:0;object-fit:cover;object-position:center;mix-blend-mode:multiply}.hero-scene:after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,#edf0df 0,transparent 30%);pointer-events:none}.hero-shuxia{position:absolute;right:16px;bottom:24px;height:138px;width:98px;object-fit:contain;z-index:2;filter:drop-shadow(0 6px 5px #42512715)}.scene-caption{position:absolute;bottom:12px;left:26px;display:flex;align-items:center;gap:7px;font-size:9px;color:#708769;z-index:3;background:#f7f6e9d9;border:1px solid #e4e5d1;border-radius:20px;padding:5px 10px}.section-heading{display:flex;align-items:end;justify-content:space-between;gap:15px;margin:29px 0 17px}.section-heading h2{font-size:19px;font-weight:600;letter-spacing:.025em;margin:4px 0 0}.section-kicker{font-size:9px;letter-spacing:.12em;color:#9da68e}.text-action{font-size:11px;line-height:1.6;color:#5b8371;padding:5px 0;white-space:nowrap}.text-action:hover{color:#1d6b54}.subject-list{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:13px}.subject-card{position:relative;display:grid;grid-template-columns:43px 1fr;grid-template-rows:auto auto;column-gap:11px;align-items:center;text-align:left;padding:16px 17px;min-height:86px;border:1px solid var(--line);border-radius:12px;background:#fcfbf5}.subject-letter{grid-row:span 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p{font-size:9px;color:#9ca88d;margin:0;min-height:15px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.resource-arrow{position:absolute;right:18px;bottom:23px;color:#7e9b7d;font-size:15px}.resource-card>.favorite-button{position:absolute;right:9px;top:9px;background:#fffef4e8;border:1px solid #e2e5d2;backdrop-filter:blur(5px);width:31px;height:31px;min-height:31px;border-radius:8px;display:grid;place-items:center;color:#8eaa80;padding:5px}.resource-card>.favorite-button svg{width:16px;height:16px}.resource-card>.favorite-button[aria-pressed="true"]{background:#e4edd9;color:#5b8056}.resource-card>.favorite-button[aria-pressed="true"] svg{fill:#b1caa0}.continue-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.compact-card .resource-open{display:grid;grid-template-columns:115px 1fr}.compact-card .resource-cover{height:110px}.compact-card .resource-copy{padding:15px}.compact-card>.favorite-button{display:none}.page-heading{padding:7px 0 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var(--line);border-radius:11px;background:#f7f7ee;overflow:hidden;min-height:0}.character-options>button>img{width:100%;height:132px;object-fit:contain;display:block;padding:10px 25px}.character-options>button>span{display:flex;justify-content:space-between;padding:11px 16px;border-top:1px solid var(--line);font-size:11px;color:#8c9f7e;background:#fafbf1}.character-options i{font-style:normal;visibility:hidden}.character-options>button[aria-pressed="true"]{border-color:#87ac7f;background:#eff3e3;box-shadow:0 0 0 1px #87ac7f}.character-options>button[aria-pressed="true"] i{visibility:visible}.help-settings details{border-top:1px solid var(--line);padding:16px 0}.help-settings details:first-of-type{margin-top:22px}.help-settings summary{cursor:pointer;font-size:12px;color:#6f8663}.help-settings details>p{max-width:740px;margin:12px 0}.account-placeholder{padding:38px;border:1px solid var(--line);border-radius:13px;background:#f5f7ed}.connection-status{font-size:10px;background:#e9edde;color:#8a9a7a;padding:5px 9px;border-radius:5px}.account-placeholder h2{font-size:22px;margin-top:24px;font-weight:550}.account-placeholder p{color:#97a68a;font-size:12px;line-height:2}.account-policy{padding-top:20px;border-top:1px solid var(--line);font-size:11px!important}.home-footer{display:flex;justify-content:space-between;gap:16px;margin-top:35px;padding:22px 0 4px;border-top:1px solid var(--line);font-size:9px;color:#b3bba3}.home-footer span:last-child{font-size:8px;letter-spacing:.16em}.bottom-nav{display:none}.experiment-screen{z-index:30}.experiment-header{background:#fbfaf4}.export-button{color:#477b5e}.help-sheet .character-options{display:none}.toast{z-index:100}
@media(min-width:1600px){main#main-content{padding-left:46px;padding-right:46px}.app-header{padding-left:46px;padding-right:46px}.home-hero{min-height:310px}.hero-copy{padding:38px 42px}.home-hero h1{font-size:37px}.resource-cover{height:175px}}
@media(max-width:1180px){.desktop-sidebar{width:190px;padding-left:12px;padding-right:12px}.platform-body{margin-left:190px}.sidebar-brand>span{font-size:17px}.sidebar-brand small{font-size:8px}.sidebar-brand>img{width:36px;height:36px}.app-header{padding-left:25px;padding-right:25px;gap:14px}.header-context #page-context,.context-dot{display:none}main#main-content{padding:25px}.home-hero h1{font-size:27px}.hero-copy{padding:27px}.hero-shuxia{height:110px;width:77px;right:8px}.subject-card{padding:14px 12px;grid-template-columns:32px 1fr;gap:9px}.subject-letter{width:32px;height:36px;font-size:16px}.subject-name{font-size:12px}.subject-meta{font-size:8px}.subject-arrow{display:none}.resource-cover{height:135px}.type-copy{padding:17px}.type-copy h2{font-size:17px}.category-cover{height:145px}}
@media(max-width:950px){.desktop-sidebar{width:174px}.platform-body{margin-left:174px}.sidebar-brand>span{font-size:15px}.sidebar-nav button,.sidebar-bottom>button{font-size:12px;padding:12px 13px;gap:9px}.app-header{gap:10px}.header-context{display:none}.search-field{margin-left:0;max-width:none}.home-hero{grid-template-columns:1.1fr .9fr;min-height:250px}.hero-copy{padding:25px}.home-hero h1{font-size:24px}.hero-scene{min-height:250px}.hero-copy>.eyebrow{font-size:7px}.scene-caption{left:8px;right:8px;font-size:7px;justify-content:center}.subject-list{grid-template-columns:repeat(2,minmax(0,1fr))}.featured-list,.experiment-list,.category-list{grid-template-columns:repeat(2,minmax(0,1fr))}.resource-cover{height:155px}.workshop-list{grid-template-columns:repeat(2,minmax(0,1fr))}.type-card{grid-column:span 6}.pending-type{grid-column:span 2}.continue-list{grid-template-columns:1fr}.module-picker select{max-width:220px}.settings-card{padding:23px}.subject-hero>div{padding:26px}.subject-hero h1{font-size:30px}}
@media(max-width:700px){.desktop-sidebar{display:none}.platform-body{margin-left:0}.app-shell{padding-bottom:calc(74px + env(safe-area-inset-bottom,0px))}.app-header{display:grid;grid-template-columns:1fr auto;min-height:0;padding:16px 18px 14px;gap:14px}.mobile-brand{display:flex;align-items:center;gap:8px;font-size:17px;color:#365c43}.mobile-brand>img{border-radius:8px}.search-field{grid-row:2;grid-column:1/-1;width:100%;height:40px;border-radius:9px}.header-actions{grid-row:1;grid-column:2}.account-entry{padding:5px 2px;font-size:11px}.account-entry svg{width:17px;height:17px}main#main-content{padding:18px}.home-hero{display:block;min-height:0;border-radius:13px}.hero-copy{padding:25px 24px 22px}.home-hero h1{font-size:27px;margin-top:12px;line-height:1.5}.hero-copy>.eyebrow{font-size:8px}.hero-copy>p{font-size:11px;margin-bottom:18px}.home-hero .hero-scene{height:190px;min-height:0;border-top:1px solid #e4e8d5}.hero-scene:after{background:linear-gradient(180deg,#edf0df,transparent 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p{font-size:9px;min-height:32px;line-height:1.8}.category-count{font-size:8px}.category-arrow{right:12px;top:32px}.explore-toolbar{gap:10px;padding:10px 0}.stage-tabs button{font-size:10px;padding:8px 11px}.module-picker{margin-left:0;flex:1;min-width:150px}.module-picker select{font-size:10px;width:100%;max-width:none}.explore-toolbar>.text-action{margin-left:auto}.list-summary{font-size:9px;gap:10px}.workshop-list{grid-template-columns:1fr;gap:15px}.workshop-list .resource-cover{height:190px}.workshop-list .resource-copy h3{font-size:15px;min-height:0}.notes-card{padding:27px 22px;gap:17px;align-items:flex-start}.notes-mark{font-size:43px}.notes-card h2{font-size:18px}.notes-card p{font-size:10px}.notes-card .primary-button{font-size:10px;padding:9px 12px}.settings-card{padding:23px 19px}.settings-heading{align-items:flex-start;flex-direction:column;gap:15px}.character-options{gap:13px}.character-options>button{width:145px;max-width:46%}.character-options>button>img{height:125px;padding:10px 15px}.character-options>button>span{font-size:10px;padding:10px}.settings-card h2{font-size:16px}.settings-card p{font-size:10px}.help-settings summary{font-size:11px}.account-placeholder{padding:25px}.account-placeholder h2{font-size:19px}.account-placeholder p{font-size:11px}.home-footer{font-size:8px;margin-top:28px;gap:8px;align-items:center}.home-footer span:last-child{font-size:6px;letter-spacing:.12em}.bottom-nav{position:fixed;bottom:0;left:0;right:0;display:flex;align-items:center;justify-content:space-around;min-height:64px;padding:7px 7px calc(7px + env(safe-area-inset-bottom,0px));border-top:1px solid var(--line);background:#fcfbf5f2;backdrop-filter:blur(12px);z-index:20}.bottom-nav button{min-width:55px;display:flex;flex-direction:column;align-items:center;gap:4px;font-size:9px;padding:5px;color:#a1af91}.bottom-nav svg{width:20px;height:20px}.bottom-nav button[aria-current="page"]{color:#3e805c;background:transparent}.compact-card .resource-cover{height:104px}.compact-card .resource-copy h3{min-height:0;font-size:13px}.availability-note{font-size:10px;margin:20px 0}.pagination{gap:13px}.page-button{font-size:10px;padding:10px 13px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}

.mobile-learning-links{display:none}@media(max-width:700px){.mobile-learning-links{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px;margin:17px 0 2px}.mobile-learning-links button{padding:12px 5px;background:#f1f3e7;border:1px solid #e1e7d5;border-radius:8px;color:#7a9470;font-size:10px}}
@media(max-width:700px){.bottom-nav{transform:none;width:100%;max-width:none;margin:0;border-radius:0;box-shadow:none}}
/* Keep the complete apparatus visible; real screenshots have different aspect ratios. */
.hero-scene>#hero-cover,.resource-cover img,.type-cover img,.category-cover img{object-fit:contain}