:root {
      --page:#fbf9f3; --paper:#fffdf9; --forest:#284b40; --forest-deep:#203c33;
      --muted:#65756d; --line:#d9e0d7; --line-warm:#e5ddd0;
      --mist:#e8eee6; --cream:#f5eee2; --sand:#f3e8d7; --clay:#a16c4e;
      --radius:12px; --container:1180px;
      --serif:"Songti SC","Noto Serif SC","STSong","SimSun",Georgia,serif;
      --sans:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Noto Sans CJK SC",sans-serif;
    }
    *{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--page);color:var(--forest-deep);font-family:var(--sans);-webkit-font-smoothing:antialiased}
    button{font:inherit}button,a{-webkit-tap-highlight-color:transparent}a{text-decoration:none;color:inherit}a:focus-visible,button:focus-visible{outline:3px solid #8dac9d;outline-offset:4px}
    .wrap{width:min(var(--container),calc(100% - 88px));margin:0 auto}
    .site-header{background:var(--page);border-bottom:1px solid var(--line-warm)}.head-in{height:82px;display:flex;align-items:center;justify-content:space-between;gap:25px}
    .brand{display:flex;align-items:center;gap:13px;white-space:nowrap}.brandmark{display:grid;place-items:center;width:41px;height:41px;color:var(--forest);border:1.4px solid currentColor;border-radius:50%}.brandmark svg{width:24px;height:24px}
    .brand strong{font-size:20px;letter-spacing:.08em;font-weight:750;display:block}.brand small{display:block;color:var(--muted);font-family:Georgia,serif;letter-spacing:.16em;font-size:9px;margin-top:4px}
    .head-right{display:flex;align-items:center;gap:38px}.head-nav{display:flex;gap:31px;color:#45574f;font-size:13px}.head-nav a:hover{color:#a16c4e}
    .language{border:1px solid var(--line);background:transparent;border-radius:50px;padding:8px 12px;font-size:12px;color:var(--forest);cursor:pointer}
    .hero{padding:87px 0 65px;display:grid;grid-template-columns:minmax(0,1fr) 295px;align-items:center;gap:60px}
    .eyebrow{font-size:12px;font-weight:700;letter-spacing:.17em;color:var(--clay);display:flex;align-items:center;gap:12px}.eyebrow::before{content:"";height:1px;width:33px;background:currentColor}
    .hero h1{font-family:var(--serif);font-size:clamp(48px,5.25vw,76px);letter-spacing:.09em;line-height:1.22;font-weight:700;margin:25px 0 19px}
    .hero-lead{font-size:19px;line-height:2.05;letter-spacing:.012em;color:#56665c;margin:0;max-width:680px}
    .hero-note{border-left:1px solid var(--line);padding-left:30px;margin-top:34px;display:flex;flex-direction:column;gap:11px}
    .hero-note small{font-size:11px;color:var(--clay);font-family:Georgia,serif;letter-spacing:.15em}.hero-note p{font-size:13px;line-height:1.95;color:var(--muted);margin:0}
    .top-label{border-bottom:1px solid var(--line-warm);display:flex;align-items:center;justify-content:space-between;padding-bottom:16px;margin-bottom:20px}
    .top-label strong{font-weight:600;font-size:13px;color:var(--muted);letter-spacing:.03em}.top-label span{font-family:Georgia,serif;letter-spacing:.12em;color:var(--clay);font-size:12px}
    .portals{display:grid;grid-template-columns:1fr 1fr;gap:23px}.portal{position:relative;overflow:hidden;min-height:280px;border:1px solid var(--line);border-top:3px solid var(--forest);border-radius:var(--radius);padding:30px 31px;background:var(--paper);display:flex;flex-direction:column;text-align:left;color:var(--forest-deep);cursor:pointer;transition:transform .2s,box-shadow .2s,border-color .2s}
    .portal:nth-child(2){background:#f9f3e9;border-top-color:var(--clay);border-color:#e9dece;border-top-color:var(--clay)}.portal:hover{transform:translateY(-4px);box-shadow:0 14px 34px rgba(38,65,50,.1)}
    .portal-index{font-family:Georgia,serif;font-size:11px;letter-spacing:.12em;color:#728278}.portal:nth-child(2) .portal-index{color:var(--clay)}.portal h2{font-size:33px;margin:27px 0 9px;letter-spacing:.065em;font-weight:730}.portal p{font-size:14px;line-height:1.9;margin:0;color:var(--muted);position:relative;z-index:1;max-width:280px}
    .portal-bottom{margin-top:auto;display:flex;align-items:center;justify-content:space-between;position:relative;z-index:1}.round-arrow{border-radius:50%;border:1px solid #d0d9cf;width:38px;height:38px;display:grid;place-items:center;font-size:21px;font-weight:300}.portal:hover .round-arrow{background:var(--forest);color:white}.portal:nth-child(2):hover .round-arrow{background:var(--clay)}
    .portal-art{position:absolute;right:15px;bottom:10px;width:218px;height:185px;color:#6b907c;opacity:.43;pointer-events:none}.portal:nth-child(2) .portal-art{color:#c29571;opacity:.46;width:207px}
    .rule{margin:90px 0 0;border-top:1px solid var(--line-warm)}
    .listing{padding-top:64px}.section-head{display:flex;align-items:end;justify-content:space-between;gap:26px;margin-bottom:27px}.section-kicker{font-family:Georgia,serif;color:var(--clay);font-size:11px;letter-spacing:.16em;margin-bottom:13px}.section-head h2{margin:0;font-size:32px;font-family:var(--serif);letter-spacing:.07em;font-weight:700}.section-head p{margin:12px 0 0;color:var(--muted);font-size:14px;line-height:1.75}
    .all-link{font-size:13px;color:var(--forest);white-space:nowrap;border-bottom:1px solid var(--forest);padding-bottom:5px}.all-link:hover{color:var(--clay);border-color:var(--clay)}
    .research-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}.content-card{background:var(--paper);border:1px solid var(--line-warm);border-radius:10px;overflow:hidden;cursor:pointer;text-align:left;padding:0;transition:transform .18s,box-shadow .18s;color:inherit;display:block;width:100%}.content-card:hover{transform:translateY(-4px);box-shadow:0 10px 28px rgba(35,57,41,.08)}
    .card-art{height:196px;position:relative;display:flex;justify-content:center;align-items:center;overflow:hidden}.art-comic{background:#e7eee7}.art-podcast{background:#f3eadf}.art-video{background:#e8ebe8}.card-art svg{width:85%;max-width:260px;height:85%}.art-label{position:absolute;left:17px;top:15px;background:rgba(255,253,249,.87);border:1px solid rgba(128,147,128,.2);padding:6px 10px;font-size:11px;color:var(--forest)}
    .card-body{padding:22px 22px 25px;min-height:162px;display:flex;flex-direction:column;gap:12px}.tags{font-size:12px;color:var(--clay);letter-spacing:.025em}.content-card h3{font-family:var(--serif);font-size:20px;line-height:1.55;margin:0;letter-spacing:.02em;font-weight:700}.card-foot{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-top:auto;color:var(--muted);font-size:12px}.card-foot span:last-child{font-size:18px;color:var(--forest)}
    .course-list{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}.course{min-height:238px;position:relative;border-radius:10px;border:1px solid #dfe3d9;background:#eef1e9;text-align:left;color:inherit;cursor:pointer;padding:27px 25px;overflow:hidden;display:flex;flex-direction:column;gap:12px;transition:transform .18s,box-shadow .18s}.course:nth-child(2){background:#f3ece3;border-color:#e7ded0}.course:nth-child(3){background:#f0f1ed}.course:hover{transform:translateY(-4px);box-shadow:0 10px 24px rgba(35,57,41,.09)}.course small{font-size:11px;color:#6a7b6e;letter-spacing:.13em;font-family:Georgia,serif}.course h3{font-family:var(--serif);font-size:25px;line-height:1.47;margin:11px 0 0;max-width:240px;position:relative;z-index:1}.course p{font-size:13px;color:var(--muted);margin:0;position:relative;z-index:1}.course .round-arrow{margin-top:auto;background:rgba(255,255,255,.5);position:relative;z-index:1}.course-art{position:absolute;right:-18px;bottom:-23px;width:150px;height:160px;color:#607a69;opacity:.22}.course:nth-child(2) .course-art{color:#a77f5e}
    .empty-note{color:var(--muted);font-size:12px;line-height:1.8;margin:20px 0 0}.footer{margin-top:98px;border-top:1px solid var(--line-warm);padding:27px 0 43px;display:flex;justify-content:space-between;gap:20px;color:var(--muted);font-size:12px}
    /* secondary pages */
    .subpage{padding:64px 0 100px;min-height:72vh}.back{padding:0;background:none;border:0;cursor:pointer;color:var(--clay);font-size:13px}.subpage h1{font-size:49px;font-family:var(--serif);letter-spacing:.06em;margin:30px 0 14px}.subpage-lead{color:var(--muted);font-size:16px;line-height:1.9}.format-tabs{display:flex;gap:9px;flex-wrap:wrap;margin:38px 0 22px}.format-tabs button{background:transparent;color:var(--muted);border:1px solid var(--line);padding:12px 20px;border-radius:6px;cursor:pointer}.format-tabs button.active{background:var(--forest);color:white;border-color:var(--forest)}.library-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:23px}.side-note{margin-top:28px;color:var(--muted);font-size:13px}.lessons{margin-top:36px;display:grid;grid-template-columns:repeat(4,1fr);gap:15px}.lesson{border:1px solid var(--line);background:var(--paper);padding:25px 20px;border-radius:8px}.lesson small{color:var(--clay);font-family:Georgia,serif;font-size:11px}.lesson h3{font-size:18px;margin:15px 0 0}.about-copy{max-width:780px;line-height:2.1;color:#56665c;font-size:16px}.hidden{display:none!important}.toast{position:fixed;bottom:28px;left:50%;transform:translateX(-50%);background:var(--forest-deep);color:white;padding:13px 19px;border-radius:6px;box-shadow:0 8px 22px rgba(0,0,0,.16);z-index:50;font-size:13px;max-width:calc(100% - 35px);text-align:center}
    @media(max-width:1020px){.hero{grid-template-columns:1fr;gap:0;padding-top:60px}.hero-note{display:none}.research-grid,.course-list,.library-grid{gap:15px}.portal-art{width:175px;opacity:.32}.hero h1{font-size:60px}}
    @media(max-width:760px){.wrap{width:calc(100% - 38px)}.head-in{height:70px}.brand strong{font-size:17px}.brandmark{height:35px;width:35px}.head-nav{display:none}.head-right{gap:0}.hero{padding:57px 0 45px}.hero h1{font-size:49px;margin:20px 0 13px}.hero-lead{font-size:16px;line-height:1.9}.portals{grid-template-columns:1fr;gap:14px}.portal{min-height:237px;padding:23px}.portal h2{font-size:29px;margin:22px 0 9px}.portal-art{width:172px;height:150px;opacity:.21}.top-label{margin-bottom:15px}.rule{margin-top:66px}.listing{padding-top:47px}.section-head h2{font-size:28px}.section-head p{font-size:13px}.section-head{align-items:start}.all-link{font-size:12px;margin-top:32px}.research-grid,.course-list,.library-grid{grid-template-columns:1fr;gap:16px}.card-art{height:220px}.card-body{min-height:134px}.course{min-height:195px}.footer{margin-top:66px;flex-direction:column;padding-bottom:30px;gap:7px}.subpage h1{font-size:40px}.lessons{grid-template-columns:repeat(2,1fr)}}
    @media(max-width:400px){.hero h1{font-size:43px}.hero-lead{font-size:15px}.portal-art{width:138px;right:-5px;opacity:.18}.portal p{max-width:220px}.card-art{height:190px}}

    /* v0.4 inner pages: independent reusable components and theme tokens */
    :root { --tile:#f3f6f0; --shadow:0 12px 30px rgba(25,63,44,.07); --hair:#dfe5da; }
    .subpage{padding:52px 0 100px;min-height:76vh}
    .crumb{font-size:12px;color:var(--muted);display:flex;align-items:center;gap:9px;margin-bottom:33px}.crumb a{color:var(--forest)}.crumb a:hover{text-decoration:underline}.crumb span{color:#a0aaa1}
    .inner-intro{display:grid;grid-template-columns:1fr 270px;gap:35px;align-items:end;border-bottom:1px solid var(--line-warm);padding-bottom:37px}
    .inner-eyebrow{font-family:Georgia,serif;font-size:12px;letter-spacing:.2em;color:var(--clay);margin-bottom:14px}
    .inner-intro h1{font-family:var(--serif);font-size:53px;line-height:1.3;letter-spacing:.085em;margin:0 0 13px}
    .inner-intro p{color:var(--muted);font-size:16px;line-height:2;margin:0;max-width:710px}
    .inner-stat{border-left:1px solid var(--line-warm);padding-left:24px;color:var(--muted);font-size:13px;line-height:1.8}
    .inner-stat strong{display:block;color:var(--forest);font-size:14px;letter-spacing:.03em;margin-bottom:9px}
    .archive-shell{display:grid;grid-template-columns:214px minmax(0,1fr);gap:42px;margin-top:38px}
    .archive-side{border-right:1px solid var(--line-warm);padding-right:23px}
    .side-caption{display:block;font-size:11px;color:var(--clay);letter-spacing:.14em;margin:0 0 17px;font-family:Georgia,serif}
    .archive-options{display:flex;flex-direction:column;gap:7px}
    .archive-options button{display:flex;align-items:center;justify-content:space-between;width:100%;text-align:left;background:none;border:0;color:#647267;padding:12px 12px;cursor:pointer;font-size:14px;border-radius:6px}
    .archive-options button.is-selected{background:var(--mist);color:var(--forest-deep);font-weight:650}
    .archive-options button:hover{background:#edf2e9}
    .side-hint{margin:34px 0 0;border-top:1px solid var(--line-warm);padding-top:25px;font-size:12px;line-height:1.9;color:var(--muted)}
    .side-hint strong{display:block;color:var(--forest);font-size:13px;margin-bottom:6px}
    .list-tools{display:flex;align-items:center;justify-content:space-between;gap:17px;margin-bottom:24px}
    .list-tools strong{font-family:var(--serif);font-size:26px;font-weight:650}
    .search-field{position:relative;display:flex;align-items:center;gap:7px;background:var(--paper);border:1px solid var(--line);border-radius:7px;padding:0 13px;width:min(330px,100%);height:43px}
    .search-field svg{width:17px;height:17px;stroke:#7d8f82;flex-shrink:0}
    .search-field input{min-width:0;border:0;background:none;outline:none;width:100%;font-size:13px;color:var(--forest-deep)}
    .search-field:focus-within{box-shadow:0 0 0 3px rgba(51,98,78,.11);border-color:var(--forest)}
    .archive-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:21px}
    .archive-tile{border:1px solid var(--line-warm);border-radius:9px;background:var(--paper);overflow:hidden;text-align:left;color:var(--forest-deep);padding:0;cursor:pointer;display:flex;flex-direction:column;min-height:310px;transition:transform .15s,box-shadow .15s}
    .archive-tile:hover{transform:translateY(-3px);box-shadow:var(--shadow)}
    .archive-art{height:146px;display:flex;align-items:center;justify-content:center;position:relative;overflow:hidden}
    .archive-art svg{height:125px;width:210px;max-width:82%}.archive-art .tile-type{position:absolute;top:13px;left:14px;background:rgba(255,255,255,.88);font-size:11px;padding:5px 9px;color:var(--forest);border:1px solid rgba(44,88,64,.08)}
    .archive-tile .tile-text{padding:20px 22px 22px;display:flex;flex-direction:column;flex:1}
    .tile-meta{font-size:11px;color:var(--clay);letter-spacing:.02em}
    .archive-tile h3{font-family:var(--serif);font-weight:650;line-height:1.58;margin:12px 0 8px;font-size:19px}
    .archive-tile p{font-size:12px;line-height:1.7;color:var(--muted);margin:0}
    .tile-foot{margin-top:auto;display:flex;justify-content:space-between;padding-top:18px;font-size:11px;color:var(--muted)}
    .empty-results{background:var(--paper);border:1px dashed var(--line);padding:34px;color:var(--muted);line-height:1.9;font-size:14px;text-align:center;border-radius:8px}
    .editorial-note{background:#f3f4ed;border-left:3px solid #b0bda8;padding:13px 18px;margin:26px 0 0;font-size:12px;line-height:1.8;color:#627166}
    .detail-back{display:inline-flex;align-items:center;gap:8px;color:var(--clay);font-size:13px;margin-bottom:33px;cursor:pointer;border:none;background:none;padding:0}
    .detail-layout{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:60px;margin-top:25px}
    .detail-kicker{font-size:12px;color:var(--clay);letter-spacing:.1em;margin-bottom:14px}
    .detail-heading{font-size:44px;font-family:var(--serif);line-height:1.45;letter-spacing:.025em;margin:0 0 18px;font-weight:700}
    .detail-intro{font-size:15px;color:var(--muted);line-height:2;max-width:720px;margin:0 0 24px}
    .media-tabs{display:flex;gap:7px;border-bottom:1px solid var(--line-warm);margin:30px 0 23px;overflow:auto;white-space:nowrap}
    .media-tabs button{border:0;background:none;padding:13px 20px 14px;cursor:pointer;color:#738279;font-size:13px;border-bottom:3px solid transparent}
    .media-tabs button.is-selected{border-bottom-color:var(--forest);color:var(--forest);font-weight:700}
    .media-placeholder{min-height:295px;background:#eef2eb;border:1px solid #dce5d9;display:flex;flex-direction:column;justify-content:center;align-items:center;text-align:center;padding:28px;border-radius:8px}
    .media-symbol{display:grid;place-items:center;width:62px;height:62px;border:1px solid #abc1b2;border-radius:50%;margin-bottom:19px;font-size:26px;color:var(--forest)}
    .media-placeholder strong{font-family:var(--serif);font-size:22px;font-weight:650}.media-placeholder p{font-size:13px;color:var(--muted);line-height:1.9;max-width:420px;margin:13px auto 0}
    .detail-sections{margin-top:42px}.detail-sections h2{font-family:var(--serif);font-size:24px;margin:0 0 16px}.detail-sections p{color:#647268;line-height:2;font-size:14px}
    .source-panel{background:var(--paper);border:1px solid var(--line-warm);border-radius:9px;padding:27px;align-self:start;position:sticky;top:24px}
    .source-panel h3{font-family:var(--serif);font-size:21px;margin:0 0 22px}.source-panel dl{margin:0}.source-panel dt{font-size:11px;letter-spacing:.06em;color:var(--muted);margin-bottom:7px}.source-panel dd{font-size:13px;color:var(--forest-deep);margin:0 0 22px;line-height:1.65;border-bottom:1px solid var(--line-warm);padding-bottom:13px}.source-panel dd:last-child{border:0;padding:0;margin:0}
    .course-topbar{display:flex;align-items:center;justify-content:space-between;gap:14px;margin:37px 0 24px}.course-topbar h2{font-family:var(--serif);font-size:26px;margin:0}.free-stamp{font-size:12px;color:var(--forest);border:1px solid #cbd8ca;padding:8px 12px;border-radius:20px;background:#f2f5ef}
    .lesson-rows{display:grid;gap:10px}
    .lesson-row{width:100%;background:var(--paper);border:1px solid var(--line-warm);border-radius:8px;display:grid;grid-template-columns:80px 1fr auto;align-items:center;gap:24px;padding:19px 23px;cursor:pointer;text-align:left;color:var(--forest-deep)}
    .lesson-row:hover{background:#f1f5ed;border-color:#c9d6c8}.lesson-no{font-size:15px;font-family:Georgia,serif;color:var(--clay);letter-spacing:.13em}
    .lesson-row h3{font-family:var(--serif);font-size:19px;font-weight:650;margin:0 0 6px}.lesson-row p{font-size:12px;color:var(--muted);margin:0}.lesson-end{display:flex;align-items:center;gap:15px;color:var(--muted);font-size:12px}.lesson-end span:last-child{font-size:20px;color:var(--forest)}
    .course-detail-nav{display:flex;gap:12px;margin:30px 0 15px;flex-wrap:wrap}.course-detail-nav button{border:1px solid var(--line);background:var(--paper);color:var(--forest);border-radius:5px;padding:11px 17px;cursor:pointer;font-size:13px}.course-detail-nav button:disabled{opacity:.4;cursor:not-allowed}
    @media(max-width:900px){.archive-shell{grid-template-columns:170px 1fr;gap:24px}.archive-side{padding-right:13px}.detail-layout{grid-template-columns:1fr;gap:24px}.source-panel{position:static}.inner-intro{grid-template-columns:1fr}.inner-stat{border-left:0;border-top:1px solid var(--line-warm);padding:18px 0 0}}
    @media(max-width:650px){.subpage{padding-top:36px}.inner-intro h1{font-size:38px}.inner-intro{gap:15px;padding-bottom:24px}.archive-shell{display:block;margin-top:22px}.archive-side{border:0;padding:0;margin-bottom:27px}.archive-options{flex-direction:row;flex-wrap:wrap;gap:6px}.archive-options button{width:auto;display:block;border:1px solid var(--line);padding:9px 13px}.archive-options button span{display:none}.archive-options button.is-selected{border-color:#9cb8a0}.side-caption{margin-bottom:12px}.side-hint{display:none}.list-tools{display:block}.list-tools strong{display:block;font-size:23px;margin-bottom:16px}.search-field{width:100%}.archive-list{grid-template-columns:1fr;gap:13px}.archive-tile{min-height:unset}.archive-art{height:142px}.archive-tile .tile-text{padding:16px 17px 20px}.detail-heading{font-size:31px}.media-placeholder{min-height:245px}.lesson-row{grid-template-columns:47px 1fr 22px;gap:11px;padding:17px 15px}.lesson-row h3{font-size:16px}.lesson-end{font-size:0}.lesson-end span:first-child{display:none}.course-topbar h2{font-size:24px}.source-panel{padding:21px}}


    /* v0.5 research page: minimal, single-column, format-first */
    .research-simple{padding-top:44px;padding-bottom:120px}
    .research-simple .crumb{margin-bottom:48px}
    .research-simple-head{margin:0 0 37px}
    .research-simple-head h1{margin:0 0 16px;font-family:var(--serif);font-weight:700;font-size:clamp(37px,4vw,52px);letter-spacing:.075em;line-height:1.3}
    .research-simple-head p{font-size:16px;color:var(--muted);line-height:1.8;margin:0}
    .research-simple-tabs{display:flex;align-items:center;gap:45px;border-bottom:1px solid var(--line-warm);margin:0 0 15px;overflow-x:auto;overflow-y:hidden;scrollbar-width:none;white-space:nowrap}
    .research-simple-tabs::-webkit-scrollbar{display:none}
    .research-simple-tabs button{position:relative;flex:0 0 auto;border:0;border-bottom:3px solid transparent;padding:17px 2px 16px;margin-bottom:-1px;background:none;cursor:pointer;color:#69756e;font-size:16px;letter-spacing:.025em}
    .research-simple-tabs button.is-selected{font-weight:700;border-bottom-color:var(--forest);color:var(--forest-deep)}
    .research-simple-tabs button:hover:not(.is-selected){color:var(--forest)}
    .research-simple-list{max-width:1050px}
    .research-simple-story{width:100%;border:0;border-bottom:1px solid var(--line-warm);background:transparent;color:var(--forest-deep);padding:24px 0;display:grid;grid-template-columns:165px minmax(0,1fr) 30px;gap:29px;align-items:center;text-align:left;cursor:pointer}
    .research-simple-story:hover h3{color:#9b6d4e}
    .research-simple-cover{width:165px;height:110px;background:var(--mist);border-radius:6px;display:flex;align-items:center;justify-content:center;overflow:hidden}
    .research-simple-cover.art-podcast{background:#f3e9dd}.research-simple-cover.art-video{background:#e8eeeb}
    .research-simple-cover svg{height:93px;width:138px}
    .research-simple-text{min-width:0}.research-simple-label{font-size:12px;letter-spacing:.05em;color:var(--clay)}
    .research-simple-text h3{font-family:var(--serif);font-size:23px;font-weight:700;line-height:1.45;margin:10px 0 9px;letter-spacing:.02em}
    .research-simple-text p{font-size:13px;line-height:1.8;color:var(--muted);margin:0;max-width:640px}
    .research-simple-go{color:var(--forest);font-size:24px;font-weight:400;justify-self:end}
    .research-draft-note{margin:27px 0 0;color:#879086;font-size:12px}
    @media(max-width:650px){.research-simple{padding-top:30px}.research-simple .crumb{margin-bottom:30px}.research-simple-head{margin-bottom:26px}.research-simple-head h1{font-size:39px}.research-simple-head p{font-size:14px}.research-simple-tabs{gap:25px}.research-simple-tabs button{font-size:14px}.research-simple-story{grid-template-columns:95px minmax(0,1fr) 17px;gap:15px;padding:21px 0}.research-simple-cover{width:95px;height:92px}.research-simple-cover svg{width:86px;height:78px}.research-simple-text h3{font-size:17px;margin:6px 0 5px}.research-simple-text p{font-size:11px;line-height:1.6;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.research-simple-label{font-size:10px}.research-simple-go{font-size:18px}}


    /* V0.8: independent classroom content, same visual system as research V0.5 */
    .classroom-simple{padding-top:44px;padding-bottom:115px}
    .classroom-simple .crumb{margin-bottom:48px}
    .classroom-simple-head{margin:0 0 37px}
    .classroom-simple-head h1{margin:0 0 16px;font-family:var(--serif);font-weight:700;font-size:clamp(37px,4vw,52px);letter-spacing:.075em;line-height:1.3}
    .classroom-simple-head p{font-size:16px;color:var(--muted);line-height:1.8;margin:0}
    .classroom-simple-list{border-top:1px solid var(--line-warm);max-width:1050px}
    .classroom-story{width:100%;border:0;border-bottom:1px solid var(--line-warm);background:transparent;color:var(--forest-deep);padding:24px 0;display:grid;grid-template-columns:165px minmax(0,1fr) 30px;gap:29px;align-items:center;text-align:left;cursor:pointer}
    .classroom-story:hover h3{color:#9b6d4e}
    .classroom-cover{width:165px;height:110px;background:var(--mist);border-radius:6px;display:flex;align-items:center;justify-content:center;overflow:hidden}
    .classroom-cover-speech{background:#f0ede5}.classroom-cover-spark{background:#eaf0e9}.classroom-cover-balance{background:#efece3}
    .classroom-cover svg{height:93px;width:138px}
    .classroom-copy{min-width:0}.classroom-label{font-size:12px;letter-spacing:.05em;color:var(--clay)}
    .classroom-copy h3{font-family:var(--serif);font-size:23px;font-weight:700;line-height:1.45;margin:10px 0 9px;letter-spacing:.02em}
    .classroom-copy p{font-size:13px;line-height:1.8;color:var(--muted);margin:0;max-width:640px}
    @media(max-width:650px){.classroom-simple{padding-top:30px}.classroom-simple .crumb{margin-bottom:30px}.classroom-simple-head{margin-bottom:26px}.classroom-simple-head h1{font-size:39px}.classroom-simple-head p{font-size:14px}.classroom-story{grid-template-columns:95px minmax(0,1fr) 17px;gap:15px;padding:21px 0}.classroom-cover{width:95px;height:92px}.classroom-cover svg{width:86px;height:78px}.classroom-copy h3{font-size:17px;margin:6px 0 5px}.classroom-copy p{font-size:11px;line-height:1.6;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.classroom-label{font-size:10px}}

  
/* V1.0 confirmed decision: only the classroom list & lesson detail use white backgrounds. */
body[data-page="classroom"],
body[data-page="lesson"] {
  --page: #ffffff;
  --paper: #ffffff;
  --line-warm: #e7ebe7;
  background: #ffffff;
}
body[data-page="classroom"] .site-header,
body[data-page="lesson"] .site-header {
  background: #ffffff;
}
/* The cover thumbnails retain subtle accent colors, while the overall page is white. */
body[data-page="classroom"] .classroom-story,
body[data-page="lesson"] .source-panel {
  background: #ffffff;
}