:root{
  --bg:#f4f6f4;
  --paper:#ffffff;
  --ink:#16211d;
  --muted:#5a6660;
  --line:#dce3de;
  --accent:#b84228;
  --accent-soft:#fbece8;
  --green:#0f6e4f;
  --green-soft:#e6f4ee;
  --yellow:#9a5b13;
  --yellow-soft:#fef4e2;
  --blue:#1e40af;
  --blue-soft:#eff6ff;
  --terminal:#121b18;
  --sidebar:262px;
  --bar:82px;
  font-family:-apple-system,BlinkMacSystemFont,"SF Pro Display","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  color:var(--ink);
  background:var(--bg);
  font-synthesis:none;
}
*{box-sizing:border-box}
body{margin:0}
a{color:inherit;text-decoration:none}
button,input,textarea,select{font:inherit}
button,a,input,textarea,select{-webkit-tap-highlight-color:transparent}
button{color:inherit;cursor:pointer;border:0;background:transparent}
button:disabled{cursor:default;opacity:.45}
button:focus-visible,a:focus-visible,input:focus-visible,textarea:focus-visible,select:focus-visible{outline:3px solid #0f6e4f;outline-offset:2px}
h1,h2,h3,h4,p{margin:0}
h1{font-size:clamp(30px,3vw,46px);line-height:1.2;letter-spacing:-.035em;font-weight:700}
h2{font-size:22px;letter-spacing:-.02em;line-height:1.38;font-weight:650}
h3{font-size:16px;font-weight:650;line-height:1.48}
p{line-height:1.78}
small{font-size:12px}
kbd,code,pre,.timer-block strong,.mono{font-family:"SFMono-Regular",Consolas,"Liberation Mono",monospace}
kbd{font-size:11px;border:1px solid var(--line);border-radius:4px;background:#fbfcfa;padding:2px 6px;color:var(--muted)}
.skip{position:fixed;top:-60px;left:12px;z-index:99;background:var(--ink);color:white;padding:12px;border-radius:6px}
.skip:focus{top:12px}

/* Sidebar */
.sidebar{width:var(--sidebar);position:fixed;inset:0 auto 0 0;background:#ebeeeb;border-right:1px solid var(--line);display:flex;flex-direction:column;padding:24px 16px 18px;z-index:30;overflow-y:auto;overscroll-behavior:contain}
.brand{display:flex;gap:12px;align-items:center;padding:0 10px;font-size:17px;font-weight:700}
.brand small{display:block;font-size:9px;letter-spacing:1.1px;color:var(--muted);font-weight:600;margin-top:4px}
.brand-mark{height:38px;width:38px;background:var(--green);color:#fff;display:grid;place-items:center;border-radius:8px;font-size:16px;font-weight:700;box-shadow:0 2px 6px rgba(15,110,79,.22)}
.course-label{font-size:11px;font-weight:600;color:var(--green);background:var(--green-soft);border:1px solid #cce6da;border-radius:6px;padding:6px 10px;margin:16px 10px 10px;letter-spacing:.5px}
.nav-group-label{font-size:10px;font-weight:700;color:var(--muted);letter-spacing:1px;padding:10px 11px 4px;text-transform:uppercase}
.nav-item{width:100%;display:flex;text-align:left;align-items:center;gap:10px;border-radius:7px;padding:9px 11px;margin:2px 0;transition:background .16s,transform .12s}
.nav-item:hover{background:#e0e5e1}
.nav-item.active{background:white;box-shadow:0 2px 5px rgba(22,33,29,.06);border:1px solid #d5ddd8}
.nav-item .nav-num{font-size:11px;color:var(--muted);font-family:monospace;width:22px;font-weight:600}
.nav-item.active .nav-num{color:var(--green)}
.nav-item .nav-title{font-size:13px;font-weight:600;line-height:1.4}
.nav-item small{font-size:10px;color:var(--muted);display:block;margin-top:2px;font-weight:400;line-height:1.45}
.nav-item .done{margin-left:auto;color:var(--green);font-size:12px;font-weight:700}
.nav-divider{height:1px;background:var(--line);margin:10px}
.sidebar-bottom{margin-top:auto;padding:16px 10px 0;border-top:1px solid var(--line)}
.sidebar-bottom p{font-size:11px;color:var(--muted);margin-top:10px;line-height:1.55}
.progress-label{display:flex;justify-content:space-between;font-size:11px;color:var(--muted);font-weight:500}
.completion-track,.timeline-track{height:5px;background:#d8dfd9;border-radius:99px;overflow:hidden}
.completion-track{margin-top:6px}
.completion-track span,.timeline-track span{display:block;background:var(--accent);height:100%;width:0;transition:width .3s}
.completion-track.follow-track span{background:var(--green)}
.sidebar-help{font-size:11px;padding:12px 0 0;color:var(--muted);display:flex;align-items:center;gap:8px}

/* Workspace & Topbar */
.workspace{margin-left:var(--sidebar);padding-bottom:calc(var(--bar) + 34px);min-height:100dvh}
.topbar{height:70px;display:flex;align-items:center;justify-content:space-between;padding:0 36px;background:rgba(255,255,255,.9);backdrop-filter:blur(10px);border-bottom:1px solid var(--line);gap:14px;position:sticky;top:0;z-index:25}
.breadcrumb{display:flex;gap:10px;align-items:center;font-size:13px;color:var(--muted);white-space:nowrap}
.breadcrumb strong{color:var(--ink);font-weight:650}
.edition-pill{font-size:11px;font-weight:600;padding:3px 9px;border-radius:99px;background:var(--green-soft);color:var(--green);border:1px solid #bfe0d1}
.top-actions{display:flex;gap:6px;align-items:center;flex-wrap:wrap}
.subtle,.quiet{padding:8px 11px;font-size:12px;font-weight:550;border-radius:6px;border:1px solid transparent}
.subtle{background:#eef1ee;color:var(--ink)}
.subtle:hover,.quiet:hover{background:#e2e7e3}
.button{display:inline-flex;gap:8px;align-items:center;justify-content:center;padding:9px 15px;border-radius:6px;font-size:12px;font-weight:600;line-height:1.4;border:1px solid var(--line);background:white;transition:background .18s,transform .12s,box-shadow .18s}
.button:hover{background:#f7f9f7}
.button:active{transform:scale(.98)}
.button.dark{background:var(--ink);color:white;border-color:var(--ink)}
.button.dark:hover{background:#2c3a34}
.button.emerald{background:var(--green);color:white;border-color:var(--green)}
.button.emerald:hover{background:#0b583f}
.button.light{background:white;color:var(--ink)}
.icon-button{font-size:12px;border:1px solid var(--line);padding:8px 12px;border-radius:6px;background:white;font-weight:550}
.icon-button:hover{background:#f0f3f0}

.search-row{display:flex;justify-content:space-between;align-items:center;padding:18px 36px 0;gap:20px;max-width:1480px;margin:0 auto}
.search-box{width:440px;max-width:100%;display:flex;align-items:center;gap:10px;background:white;border:1px solid var(--line);border-radius:8px;padding:0 12px;box-shadow:0 1px 2px rgba(0,0,0,.02)}
.search-box>span{font-size:18px;color:var(--muted);line-height:1}
.search-box input{width:100%;background:transparent;border:0;outline:none;font-size:12px;padding:10px 0;color:var(--ink)}
.session-info{font-size:11px;color:var(--muted);font-weight:500}
.menu-toggle{display:none}
#main{max-width:1480px;margin:0 auto;padding:28px 36px 44px;outline:none}

/* Common Typography & Badges */
.eyebrow{font-size:11px;color:var(--accent);font-weight:700;letter-spacing:1px;display:block;margin-bottom:10px;text-transform:uppercase}
.eyebrow.emerald{color:var(--green)}
.intro{max-width:760px;color:var(--muted);font-size:14px;line-height:1.85;margin-top:12px}
.status{display:inline-flex;align-items:center;font-size:11px;font-weight:600;padding:4px 9px;border-radius:5px;background:var(--green-soft);color:var(--green);line-height:1.35}
.status.pending{background:var(--yellow-soft);color:var(--yellow)}
.status.info{color:var(--blue);background:var(--blue-soft)}
.status.accent{color:var(--accent);background:var(--accent-soft)}

/* Hero & 180-min Overview */
.hero{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(300px,.85fr);gap:36px;padding:8px 0 32px;align-items:center;border-bottom:1px solid var(--line)}
.hero h1 em{font-style:normal;color:var(--green)}
.hero-actions,.demo-actions{display:flex;gap:8px;flex-wrap:wrap;align-items:center}
.hero .demo-actions{margin-top:20px}
.hero-example{background:white;border:1px solid var(--line);padding:14px;border-radius:10px;box-shadow:0 4px 14px rgba(22,33,29,.04)}
.hero-example img{width:100%;height:auto;display:block;border-radius:6px;border:1px solid #e6eae7}
.hero-example p{font-size:12.5px;color:var(--muted);margin:12px 4px 10px;font-weight:500}
.hero-example .demo-actions{margin:4px}

.metrics{display:grid;grid-template-columns:repeat(4,1fr);padding:22px 0;border-bottom:1px solid var(--line);gap:16px}
.metric{background:white;border:1px solid var(--line);border-radius:8px;padding:16px 20px;display:flex;gap:12px;align-items:baseline}
.metric strong{font-size:26px;font-weight:700;letter-spacing:-1px;color:var(--ink)}
.metric span{color:var(--muted);font-size:12px;font-weight:500}

.section-heading{display:flex;justify-content:space-between;align-items:flex-end;gap:16px;margin:30px 0 16px;flex-wrap:wrap}
.section-heading h2{font-size:20px}
.section-heading p{font-size:12px;color:var(--muted)}

/* 6 Worklines Grid (.teacher-choices) */
.teacher-choices{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
.teacher-choice{border:1px solid var(--line);background:#fff;padding:22px;text-align:left;border-radius:10px;color:inherit;display:flex;flex-direction:column;justify-content:space-between;transition:border-color .16s,box-shadow .16s}
.teacher-choice:hover{border-color:#b2cabe;box-shadow:0 4px 14px rgba(22,33,29,.05)}
.teacher-choice small{color:var(--green);font-weight:700;font-size:11px;font-family:monospace}
.teacher-choice h3{font-size:19px;line-height:1.4;margin:8px 0}
.teacher-choice p{font-size:13px;line-height:1.75;color:var(--muted);margin-bottom:16px}
.teacher-choice .button{font-size:12px;padding:8px 13px}

/* Follow-Along 4-Step Track ("信息老师跟我学") */
.follow-banner{background:linear-gradient(135deg,#132a23 0%,#1d3f34 100%);color:white;border-radius:12px;padding:26px 30px;margin-bottom:24px;display:flex;justify-content:space-between;align-items:center;gap:24px;flex-wrap:wrap;box-shadow:0 6px 20px rgba(15,110,79,.12)}
.follow-banner h2{font-size:22px;color:white;margin-top:4px}
.follow-banner p{font-size:13px;color:#cfe3da;margin-top:8px;max-width:720px;line-height:1.75}
.follow-banner-stats{display:flex;gap:16px;align-items:center;background:rgba(255,255,255,.1);padding:14px 18px;border-radius:10px;border:1px solid rgba(255,255,255,.16);flex-wrap:wrap}
.follow-banner-stats strong{font-size:24px;color:#6ee7b7;display:block;font-family:monospace}
.follow-banner-stats span{font-size:11px;color:#d1fae5}

.follow-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px;margin-bottom:28px}
.follow-card{background:white;border:1px solid var(--line);border-radius:10px;padding:22px 24px;display:flex;flex-direction:column;justify-content:space-between;transition:border-color .18s,box-shadow .18s;position:relative}
.follow-card:hover{border-color:#b2cabe;box-shadow:0 4px 14px rgba(22,33,29,.05)}
.follow-card.is-done{border-color:#86efac;background:#fafffc}
.follow-card-top{display:flex;justify-content:space-between;align-items:center;gap:10px;margin-bottom:12px}
.follow-step-pill{display:inline-flex;align-items:center;gap:8px;font-size:11px;font-weight:700;font-family:monospace;padding:4px 10px;border-radius:6px;background:var(--green-soft);color:var(--green)}
.follow-time{font-size:11px;color:var(--muted);font-weight:500}
.follow-card h3{font-size:17px;line-height:1.42;margin-bottom:10px}
.follow-why{font-size:12px;color:#495750;background:#f4f7f5;border-left:3px solid var(--green);padding:10px 12px;border-radius:0 6px 6px 0;margin-bottom:14px;line-height:1.7}
.follow-actions-list{margin:0 0 14px;padding-left:18px;font-size:12.5px;color:var(--ink);line-height:1.75}
.follow-actions-list li+li{margin-top:6px}
.follow-check-bar{font-size:11.5px;background:var(--yellow-soft);color:var(--yellow);padding:9px 12px;border-radius:6px;margin-bottom:16px;line-height:1.6;font-weight:500}
.follow-footer{display:flex;justify-content:space-between;align-items:center;gap:10px;padding-top:14px;border-top:1px solid var(--line);flex-wrap:wrap}
.follow-done-toggle{display:inline-flex;align-items:center;gap:7px;font-size:12px;font-weight:600;color:var(--green);cursor:pointer;user-select:none}
.follow-done-toggle input{accent-color:var(--green);width:15px;height:15px;cursor:pointer}

/* Interactive Recipe Workbench ("30秒校本指令填空器") */
.recipe-workbench{background:white;border:1px solid var(--line);border-radius:12px;padding:24px 26px;margin-bottom:28px;box-shadow:0 2px 10px rgba(22,33,29,.03)}
.recipe-presets{display:flex;gap:10px;flex-wrap:wrap;margin:14px 0 20px}
.recipe-preset-btn{padding:9px 14px;border-radius:7px;border:1px solid var(--line);background:#f7f9f7;font-size:12px;font-weight:600;color:var(--ink);transition:all .15s}
.recipe-preset-btn:hover{background:#ebf0ed}
.recipe-preset-btn.active{background:var(--green);color:white;border-color:var(--green)}
.recipe-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:24px;align-items:stretch}
.recipe-inputs{display:grid;gap:12px}
.recipe-field label{display:block;font-size:12px;font-weight:650;margin-bottom:5px;color:var(--ink)}
.recipe-field input,.recipe-field textarea{width:100%;border:1px solid var(--line);border-radius:6px;padding:9px 12px;font-size:12px;line-height:1.6;background:#fcfdfc;color:var(--ink)}
.recipe-field textarea{min-height:62px;resize:vertical}
.recipe-output{background:var(--terminal);color:#e6f4ee;border-radius:10px;padding:20px;display:flex;flex-direction:column;justify-content:space-between}
.recipe-output-head{display:flex;justify-content:space-between;align-items:center;gap:10px;padding-bottom:12px;border-bottom:1px solid rgba(255,255,255,.12);margin-bottom:12px}
.recipe-output-head span{font-size:11px;color:#86efac;font-family:monospace;font-weight:600}
.recipe-output pre{margin:0;white-space:pre-wrap;word-break:break-word;font-size:12px;line-height:1.85;color:#ecfdf5;max-height:290px;overflow:auto}
.recipe-output-foot{display:flex;justify-content:space-between;align-items:center;gap:10px;margin-top:14px;padding-top:12px;border-top:1px solid rgba(255,255,255,.12);flex-wrap:wrap}
.recipe-output-foot small{font-size:11px;color:#9ca3af}

/* Case Tiles & Agenda */
.case-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.case-tile{background:white;border:1px solid var(--line);border-radius:10px;overflow:hidden;display:flex;flex-direction:column;transition:box-shadow .18s}
.case-tile:hover{box-shadow:0 4px 14px rgba(22,33,29,.05)}
.case-art{height:186px;background:#eeefea;position:relative;overflow:hidden;padding:19px 23px 0}
.case-art img{width:100%;height:100%;object-fit:cover;object-position:top;border-radius:5px 5px 0 0;border:1px solid #ddd;display:block}
.case-art.paper{background:#edeae4;padding:0}
.case-art.paper img{max-width:100%;filter:grayscale(.05);border:0;border-radius:0;object-fit:cover;object-position:center 42%}
.case-art:not(.paper) img{width:200%;max-width:none;height:200%;object-fit:cover;object-position:left top}
.case-body{padding:22px 24px;flex:1;display:flex;flex-direction:column}
.case-body .eyebrow{margin-bottom:8px;font-size:10px}
.case-body h3{font-size:20px;letter-spacing:-.02em}
.case-body p{font-size:12.5px;color:var(--muted);margin-top:8px;line-height:1.75;max-width:480px}
.case-bottom{display:flex;align-items:center;justify-content:space-between;margin-top:auto;padding-top:18px;gap:10px;flex-wrap:wrap}
.text-link{font-size:12px;font-weight:600;color:var(--green);padding:0;display:inline-flex;align-items:center;gap:8px}
.text-link:hover{text-decoration:underline}

.agenda-list{display:grid;gap:0;background:white;border-radius:10px;border:1px solid var(--line);overflow:hidden}
.agenda-item{display:grid;grid-template-columns:86px 34px 190px 1fr 24px;align-items:center;gap:14px;width:100%;text-align:left;padding:15px 20px;border-bottom:1px solid var(--line);transition:background .15s}
.agenda-item:last-child{border-bottom:0}
.agenda-item:hover{background:#f2f6f3}
.agenda-time{font-family:monospace;color:var(--green);font-weight:600;font-size:12px}
.agenda-number{font-size:11px;color:#8c9690;font-family:monospace}
.agenda-name{font-weight:650;font-size:14px}
.agenda-desc{font-size:12px;color:var(--muted)}
.agenda-arrow{color:var(--green);font-weight:700}

/* Chapter & Lesson View */
.chapter-head{display:flex;justify-content:space-between;gap:30px;padding:4px 0 22px;align-items:flex-end;flex-wrap:wrap}
.chapter-head h1{font-size:36px}
.chapter-meta{text-align:right;flex-shrink:0;background:white;border:1px solid var(--line);padding:12px 18px;border-radius:8px}
.chapter-meta strong{display:block;font-size:26px;font-weight:700;letter-spacing:-1px;color:var(--green)}
.chapter-meta small{color:var(--muted);line-height:1.8}
.tabs{display:flex;gap:10px;border-bottom:1px solid var(--line);margin-bottom:24px;overflow:auto;padding-bottom:1px}
.tab{font-size:13px;color:var(--muted);padding:11px 16px;border-bottom:3px solid transparent;white-space:nowrap;border-radius:6px 6px 0 0;font-weight:550}
.tab:hover{background:#ebf0ec;color:var(--ink)}
.tab.active{color:var(--green);border-color:var(--green);background:white;font-weight:700}
.chapter-layout{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:24px;align-items:start}
.chapter-main{min-width:0}
.panel{background:white;border:1px solid var(--line);border-radius:10px;padding:24px}
.panel+.panel{margin-top:18px}
.panel h2{font-size:18px;margin-bottom:14px}
.panel h3{font-size:15px;margin:16px 0 6px}
.panel li,.panel dd{line-height:1.85;margin:6px 0;font-size:13.5px}
.panel dt{margin-top:16px;font-size:14px}
.panel code{overflow-wrap:anywhere;background:#f0f4f1;padding:2px 6px;border-radius:4px;font-size:12px}

.feature-preview{border:1px solid var(--line);border-radius:10px;overflow:hidden;margin-bottom:24px;background:white;box-shadow:0 2px 8px rgba(22,33,29,.03)}
.feature-preview iframe{width:100%;height:560px;border:0;display:block;background:#faf9f5}
.feature-preview p{font-size:12.5px;color:var(--muted);padding:12px 18px;margin:0;border-top:1px solid var(--line);background:#fafcfa}
.teacher-flow{font-size:15px;font-weight:600;line-height:1.8;color:var(--green);background:var(--green-soft);padding:12px 16px;border-radius:8px;margin:8px 0 14px}

.lead-block{padding:20px 24px;background:var(--green-soft);border:1px solid #c5e3d5;border-radius:10px;margin-bottom:20px}
.lead-block p{font-size:16px;line-height:1.8;font-weight:600;color:#113c2d}
.lead-block small{display:block;font-size:11px;font-weight:700;color:var(--green);margin-bottom:6px;letter-spacing:.5px}
.point{display:grid;grid-template-columns:32px 1fr;gap:12px;padding:16px 0;border-bottom:1px solid var(--line)}
.point:last-child{border-bottom:0}
.point-num{font-family:monospace;font-size:11px;font-weight:700;color:var(--green);background:var(--green-soft);width:24px;height:24px;display:grid;place-items:center;border-radius:5px;margin-top:2px}
.point h3{font-size:15px;margin-bottom:5px}
.point p{font-size:13px;color:var(--muted);line-height:1.8}

.chapter-aside .panel{padding:20px;background:#fafcfa}
.aside-label{font-size:11px;font-weight:700;color:var(--muted);margin-bottom:12px;display:block;letter-spacing:.6px}
.checklist{display:grid;gap:12px}
.checklist label{display:flex;align-items:flex-start;gap:9px;font-size:12.5px;line-height:1.65;cursor:pointer}
.checklist input{accent-color:var(--green);margin-top:4px;flex-shrink:0}
.note-field{width:100%;min-height:120px;border:1px solid var(--line);background:white;border-radius:6px;resize:vertical;padding:11px;font-size:12px;line-height:1.75;color:var(--ink)}
.aside-footer{display:flex;justify-content:space-between;align-items:center;margin-top:10px;font-size:11px;color:var(--muted)}
.complete-section{margin-top:18px;width:100%}
.complete-section.completed{background:var(--green-soft);color:var(--green);border-color:#b8decb}

/* Guides ("回家照着做 · 20张操作单") */
.guide-groups{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin:18px 0 26px}
.guide-groups details{border:1px solid var(--line);padding:14px 16px;background:white;border-radius:10px}
.guide-groups details[open]{border-color:#9ecbb5;box-shadow:0 2px 8px rgba(15,110,79,.05)}
.guide-groups summary{cursor:pointer;font-weight:650;font-size:14px}
.guide-groups summary small{font-weight:500;color:var(--green);margin-left:8px}
.guide-picker{display:flex;flex-wrap:wrap;gap:8px;margin:12px 0 0}
.guide-picker .filter{text-align:left}
.guide-summary{background:white;border:1px solid var(--line);border-radius:10px;padding:24px 26px;margin-bottom:22px}
.guide-summary h2{font-size:26px;line-height:1.35;margin:4px 0 12px}
.guide-summary p{font-size:14.5px;line-height:1.85;margin:6px 0}
.guide-step-list{background:white;border:1px solid var(--line);border-radius:10px;padding:6px 24px;margin-bottom:20px}
.guide-step{display:flex;gap:18px;border-top:1px solid var(--line);padding:22px 0}
.guide-step:first-child{border-top:0}
.guide-step-number{flex:none;font-size:14px;font-weight:700;font-family:monospace;width:32px;height:32px;background:var(--green-soft);color:var(--green);border-radius:8px;display:grid;place-items:center;margin-top:2px}
.guide-step h3{font-size:17px;margin:0 0 6px}
.guide-step p{font-size:14px;line-height:1.8;margin:6px 0;color:var(--ink)}
.guide-success{background:var(--green-soft);color:#134634;padding:11px 14px;border-left:3px solid var(--green);border-radius:0 6px 6px 0;font-size:13px!important}
.guide-prompt{white-space:pre-wrap;overflow-wrap:anywhere;font:12.5px/1.85 "SFMono-Regular",Consolas,monospace;background:var(--terminal);color:#e6f4ee;padding:18px 20px;border-radius:8px;margin:10px 0}

/* Highlights ("12个亮点速演") & Toolbox ("10个公开入口") */
.highlight-entry{margin-top:28px;background:linear-gradient(135deg,#ffffff 0%,#f0f7f3 100%);border-color:#bcdbd0}
.highlight-grid,.toolbox-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px}
.highlight-card,.toolbox-grid .panel{margin:0;min-width:0;display:flex;flex-direction:column;justify-content:space-between}
.highlight-card h2,.toolbox-grid h2{font-size:20px;line-height:1.4;margin:4px 0 10px}
.highlight-result{padding:12px 15px;background:var(--green-soft);border-left:3px solid var(--green);border-radius:0 8px 8px 0;line-height:1.75;font-size:13px;margin-bottom:10px}
.highlight-steps{padding-left:20px;line-height:1.8;font-size:13px;margin:10px 0}
.highlight-steps li{padding:3px 0}
.highlight-card details{margin:12px 0}
.highlight-card summary{cursor:pointer;font-weight:650;font-size:13px;color:var(--green)}
.highlight-card .guide-prompt,.toolbox-grid .guide-prompt{max-height:240px;overflow:auto}
.filter-row a.filter{text-decoration:none}
.callout a{color:inherit;text-decoration:underline}

/* Demo & Resource Cards */
.demo-item{border:1px solid var(--line);border-radius:10px;padding:20px 22px;background:#fff;margin-bottom:14px;display:flex;flex-direction:column;justify-content:space-between}
.demo-item h3{font-size:16px}
.demo-item p{font-size:12.5px;color:var(--muted);margin:8px 0 12px;line-height:1.75}
.demo-item-header{display:flex;justify-content:space-between;gap:12px;align-items:flex-start}
.demo-how{font-size:12px;background:#f4f8f5;border-left:3px solid var(--green);padding:8px 11px;border-radius:0 5px 5px 0;color:#224237;margin-bottom:14px;line-height:1.65}
.source-caption{font-size:11px;color:var(--muted);margin-top:10px;line-height:1.65;word-break:break-word}

.step-list{counter-reset:step;display:grid;gap:16px}
.step{display:grid;grid-template-columns:68px 1fr;gap:16px;padding-bottom:16px;border-bottom:1px solid var(--line)}
.step:last-child{border:0;padding-bottom:0}
.step-time{font-size:11px;font-weight:700;color:var(--green);background:var(--green-soft);font-family:monospace;padding:4px 8px;border-radius:5px;height:fit-content;text-align:center}
.step h3{font-size:15px;margin-bottom:6px}
.step p{font-size:13px;color:var(--muted);line-height:1.75}
.step .evidence{margin-top:8px;padding:9px 12px;background:var(--yellow-soft);border-left:3px solid var(--yellow);font-size:11.5px;color:var(--yellow);border-radius:0 5px 5px 0;font-weight:500}

/* Prompt Cards */
.prompt-card{background:white;border:1px solid var(--line);border-radius:10px;overflow:hidden;margin-bottom:20px;box-shadow:0 2px 6px rgba(22,33,29,.02)}
.prompt-header{display:flex;justify-content:space-between;align-items:center;padding:16px 20px;border-bottom:1px solid var(--line);gap:16px;background:#fafcfa}
.prompt-header h3{font-size:15px}
.prompt-meta-bar{display:flex;flex-wrap:wrap;gap:14px;padding:10px 20px;background:#f3f6f4;border-bottom:1px solid var(--line);font-size:11.5px;color:var(--muted)}
.prompt-meta-bar span strong{color:var(--ink)}
.prompt-card pre{white-space:pre-wrap;word-break:break-word;font-size:12.5px;line-height:1.85;margin:0;padding:20px;color:#e6f4ee;background:var(--terminal);max-height:360px;overflow:auto}
.prompt-purpose{font-size:12px;color:var(--muted);padding:12px 20px;background:white;border-top:1px solid var(--line)}

.tagline{font-size:12.5px;color:var(--muted);margin-bottom:18px;line-height:1.75}
.filter-row{display:flex;flex-wrap:wrap;gap:8px;margin:20px 0}
.filter{font-size:12px;font-weight:600;padding:8px 14px;border:1px solid var(--line);border-radius:6px;background:#fff;transition:all .15s}
.filter:hover{background:#eef2ef}
.filter.active{background:var(--ink);color:#fff;border-color:var(--ink)}

/* Structured Resource List & Grid */
.resource-section-title{font-size:17px;font-weight:700;margin:28px 0 14px;display:flex;align-items:baseline;justify-content:space-between;gap:10px;color:var(--ink);flex-wrap:wrap;border-bottom:1px solid var(--line);padding-bottom:8px}
.resource-section-title small{font-size:12px;color:var(--muted);font-weight:450}
.resource-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}
.resource{display:flex;flex-direction:column;justify-content:space-between;gap:12px;padding:18px 20px;background:#fff;border:1px solid var(--line);border-radius:10px;transition:border-color .15s,box-shadow .15s}
.resource:hover{border-color:#b5cbbd;box-shadow:0 3px 10px rgba(22,33,29,.04)}
.resource-top{display:flex;align-items:flex-start;gap:12px}
.resource-icon{font-size:10px;font-weight:700;font-family:monospace;color:var(--green);width:42px;height:36px;background:var(--green-soft);border:1px solid #c2e2d3;display:grid;place-items:center;border-radius:6px;flex-shrink:0}
.resource-icon.doc{color:var(--accent);background:var(--accent-soft);border-color:#f3cfc6}
.resource-icon.code{color:var(--blue);background:var(--blue-soft);border-color:#c7d9fe}
.resource h3{font-size:15px;line-height:1.4}
.resource p{font-size:12px;color:var(--muted);margin-top:4px;line-height:1.7}
.resource-usage{font-size:11.5px;background:#f4f8f5;color:#1e4638;padding:8px 10px;border-radius:6px;border-left:3px solid var(--green);line-height:1.6}
.resource-foot{display:flex;justify-content:space-between;align-items:center;gap:10px;padding-top:10px;border-top:1px solid var(--line);flex-wrap:wrap}
.resource .resource-meta{font-size:11px;color:#737d77;font-family:monospace}
.resource .demo-actions{flex-wrap:wrap}

.empty{padding:50px 24px;text-align:center;color:var(--muted);font-size:14px;border:1px dashed #c8d2cc;border-radius:10px;background:white}
.search-result{display:block;background:#fff;border:1px solid var(--line);border-radius:8px;padding:18px 20px;margin-bottom:12px;width:100%;text-align:left;transition:border-color .15s}
.search-result:hover{border-color:var(--green)}
.search-result h3{margin:6px 0}
.search-result p{font-size:12px;color:var(--muted)}

/* Transport Footer */
.transport{position:fixed;bottom:0;right:0;left:var(--sidebar);height:var(--bar);background:rgba(255,255,255,.94);backdrop-filter:blur(12px);border-top:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 36px;gap:26px;z-index:20}
.timer-block{display:flex;align-items:center;gap:12px;white-space:nowrap}
.timer-caption{font-size:11px;color:var(--muted);font-weight:500}
.timer-block strong{font-size:24px;font-weight:700;letter-spacing:-1px}
.timer-block strong.overtime{color:var(--accent)}
.now-block{flex:1;max-width:360px}
.now-block>span{font-size:11px;color:var(--muted);display:block;margin-bottom:8px;font-weight:500}
.transport-actions{display:flex;align-items:center;gap:10px}

.callout{border-left:3px solid var(--green);background:var(--green-soft);padding:14px 18px;margin:18px 0;font-size:12.5px;line-height:1.8;color:#153e30;border-radius:0 8px 8px 0}
.callout.warning{background:var(--yellow-soft);border-left-color:var(--yellow);color:#78450b}

.term-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin:18px 0}
.term{border:1px solid var(--line);background:white;border-radius:8px;padding:18px}
.term small{color:var(--green);font-family:monospace;font-size:11px;font-weight:700}
.term h3{margin:6px 0;font-size:16px}
.term p{font-size:12px;color:var(--muted);line-height:1.7}

.pipeline{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin:20px 0}
.pipeline-step{background:white;border:1px solid var(--line);padding:10px 14px;font-size:12px;font-weight:600;border-radius:6px}
.pipeline-arrow{color:var(--green);font-size:14px;font-weight:700}

.status-table{width:100%;border-collapse:collapse;margin-top:10px;font-size:12.5px}
.status-table th,.status-table td{padding:13px 12px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top;line-height:1.75}
.status-table th{color:var(--muted);font-size:11px;font-weight:650}
.status-table td:first-child{min-width:140px;font-weight:600}
.status-table-wrap{overflow:auto}

.speaker{font-size:15px;line-height:1.95;color:#2c3832}
.speaker p+p{margin-top:16px}
.speaker mark{background:var(--accent-soft);color:var(--accent);padding:2px 5px;border-radius:3px}

.download-strip{margin-top:26px;padding:22px 26px;display:flex;align-items:center;justify-content:space-between;gap:20px;background:#e8eee9;border:1px solid #cddbd1;border-radius:10px;flex-wrap:wrap}
.download-strip h3{font-size:16px}
.download-strip p{font-size:12px;color:var(--muted);margin-top:4px}

dialog{padding:0;width:min(1200px,95vw);max-height:94dvh;border:1px solid #cbd4ce;border-radius:12px;background:white;color:var(--ink);box-shadow:0 20px 50px rgba(0,0,0,.22)}
dialog::backdrop{background:rgba(15,24,20,.55);backdrop-filter:blur(3px)}
.dialog-head{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:18px 24px;border-bottom:1px solid var(--line)}
.dialog-head .eyebrow{margin-bottom:4px}
.dialog-head h2{font-size:19px}
.dialog-frame{width:100%;height:70dvh;border:0;display:block;background:#f7f7f2}
.viewer-tools{padding:12px 24px;border-top:1px solid var(--line);display:flex;justify-content:space-between;align-items:center;gap:14px;font-size:11.5px;color:var(--muted);background:#fafcfa;flex-wrap:wrap}
.viewer-source{padding:22px 26px;white-space:pre-wrap;word-break:break-word;font-size:12.5px;line-height:1.85;max-height:70dvh;overflow:auto;background:var(--terminal);color:#e6f4ee;margin:0}
.viewer-document{padding:28px 34px;max-height:73dvh;overflow:auto;line-height:1.85;font-size:14px}
.viewer-document h1{font-size:26px;margin-bottom:18px}
.viewer-document h2{font-size:19px;margin:26px 0 12px}
.viewer-document h3{font-size:16px;margin:20px 0 10px}
.viewer-document p{margin:10px 0}
.viewer-document ul,.viewer-document ol{padding-left:22px}
.viewer-document li{margin:6px 0}
.viewer-document pre{padding:16px;background:var(--terminal);color:#e6f4ee;border-radius:8px;white-space:pre-wrap;overflow:auto;font-size:12px;line-height:1.8}
.viewer-document a{color:var(--green);text-decoration:underline;text-underline-offset:3px}
.viewer-document table{border-collapse:collapse;font-size:12px;display:block;overflow:auto}
.viewer-document th,.viewer-document td{padding:10px;border:1px solid var(--line);min-width:90px;line-height:1.75}
.viewer-document blockquote{margin:14px 0;border-left:3px solid var(--green);padding-left:14px;color:var(--muted)}

.toast{position:fixed;bottom:100px;left:calc(50% + var(--sidebar)/2);transform:translate(-50%,12px);background:var(--green);color:white;padding:12px 20px;font-size:12.5px;font-weight:600;border-radius:8px;opacity:0;pointer-events:none;transition:opacity .15s,transform .15s;z-index:80;max-width:80vw;line-height:1.5;box-shadow:0 8px 24px rgba(15,110,79,.28)}
.toast.show{opacity:1;transform:translate(-50%,0)}
.help-grid{display:grid;grid-template-columns:90px 1fr;gap:14px;font-size:13.5px;padding:20px 0}
.check-note{font-size:11px;color:var(--muted);line-height:1.65;margin-top:12px}

.student .instructor-only{display:none!important}
.student .chapter-layout{grid-template-columns:1fr}
.student .session-info{color:var(--green)}

.projection{--sidebar:0px}
.projection .sidebar,.projection .search-row,.projection .top-actions #mode-toggle{display:none}
.projection #main{max-width:1480px;padding:30px 50px 45px}
.projection .chapter-layout{grid-template-columns:1fr}
.projection .chapter-aside{display:none}
.projection h1{font-size:48px}
.projection .point h3,.projection .step h3{font-size:22px}
.projection .point p,.projection .step p,.projection .speaker{font-size:20px}
.projection .lead-block p{font-size:23px}
.projection .chapter-head .intro{font-size:17px;max-width:900px}
.projection .demo-item p{font-size:17px}
.projection .button{font-size:15px;padding:12px 18px}
.projection .tab{font-size:17px}
.projection .prompt-card pre{font-size:16px;max-height:52dvh}
.projection .breadcrumb{font-size:14px}
.projection .agenda-name{font-size:19px}
.projection .agenda-desc{font-size:14px}
.projection .case-body p{font-size:16px}
.projection .brand{display:none}
.projection .timer-caption{font-size:13px}
.projection .timer-block strong{font-size:30px}
.projection .transport{padding:0 50px}
.projection .session-info{display:none}

@media(max-width:1200px){
  :root{--sidebar:228px}
  .topbar,.search-row,#main{padding-left:24px;padding-right:24px}
  .chapter-layout,.recipe-grid,.follow-grid,.resource-list,.highlight-grid,.toolbox-grid{grid-template-columns:1fr}
  .teacher-choices{grid-template-columns:repeat(2,minmax(0,1fr))}
  .chapter-aside{display:grid;grid-template-columns:1fr 1fr;gap:18px}
  .chapter-aside .panel+.panel{margin:0}
  .chapter-aside .complete-section{grid-column:1/-1;margin:0}
  .hero{gap:24px;grid-template-columns:1fr}
  .agenda-item{grid-template-columns:78px 28px 140px 1fr 18px}
  .term-grid{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:850px){
  :root{--sidebar:0px;--bar:74px}
  .sidebar{transform:translateX(-100%);width:258px;transition:transform .2s}
  .sidebar.open{transform:translateX(0);box-shadow:0 0 0 100vmax rgba(21,26,24,.35)}
  .menu-toggle{display:block;flex-shrink:0}
  .topbar{height:64px;padding:0 16px;gap:10px}
  .breadcrumb{margin-right:auto;font-size:12px;gap:6px}
  .breadcrumb>span:first-child{display:none}
  .top-actions{gap:4px}
  .top-actions .subtle{padding:7px 9px;font-size:11px}
  .top-actions .button{font-size:11px;padding:8px 10px}
  .search-row{padding:14px 18px 0}
  .search-box{width:100%}
  .session-info{display:none}
  #main{padding:22px 18px 32px}
  .metrics,.teacher-choices,.case-grid,.term-grid,.guide-groups{grid-template-columns:1fr}
  .agenda-item{grid-template-columns:68px 22px 1fr 14px;gap:10px;padding:14px 16px}
  .agenda-desc{display:none}
  .chapter-head{flex-direction:column;align-items:flex-start;gap:12px}
  .chapter-meta{text-align:left;width:100%}
  .chapter-aside{grid-template-columns:1fr}
  .transport{padding:0 16px;gap:10px}
  .now-block{display:none}
  .toast{left:50%;bottom:90px}
  .download-strip{padding:18px;flex-direction:column;align-items:flex-start}
}
@media(prefers-reduced-motion:no-preference){
  #main>*{animation:appear .22s both}
  @keyframes appear{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:translateY(0)}}
}
@media(prefers-reduced-motion:reduce){
  *,*::before,*::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}
}
:root .sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
html{scroll-padding-bottom:120px}
button,a,textarea,input{scroll-margin-block:24px 120px}

/* 操作素材与成果展示分开：所有入口保持可读。 */
.material-link{color:#075e43;background:transparent;text-align:left;text-decoration:underline;text-underline-offset:3px;padding:2px 0;overflow-wrap:anywhere;font-weight:600;line-height:1.65}.material-link:hover{color:#153c2d;text-decoration-thickness:2px}.material-panel{padding:18px;background:#f3f7f3;border:1px solid #d8e4dc;border-radius:8px;margin:18px 0;color:var(--ink)}.material-panel h3{margin:0 0 8px}.material-row{display:flex;gap:12px;justify-content:space-between;align-items:center;padding:12px 0;border-bottom:1px solid #dce4de;flex-wrap:wrap}.material-row:last-child{border-bottom:0}.material-row>div:first-child{display:flex;align-items:center;gap:10px;min-width:0;flex:1}.material-row .demo-actions{flex-shrink:0}.material-type{font:10px/1.5 ui-monospace,monospace;background:#e0ece4;color:#315943;border-radius:4px;padding:4px 6px;flex-shrink:0}.material-library details{margin:16px 0;border:1px solid #dce4de;padding:14px;border-radius:8px}.material-library summary{cursor:pointer;font-weight:700}.material-library summary small{font-weight:400;margin-left:10px;color:#52665a}.material-notice{padding:14px 20px;line-height:1.8;background:#eef5ef;margin-bottom:16px;color:#244a38}.material-directory{padding:0 20px}.material-table{overflow:auto;padding:0 20px 20px}.material-table table{border-collapse:collapse;width:100%;text-align:left;font-size:14px}.material-table th,.material-table td{border:1px solid #d6dfd8;padding:10px 14px;white-space:pre-wrap;min-width:90px;vertical-align:top}.material-table th{background:#eaf2ec}.material-source{margin:16px;max-height:65vh;overflow:auto;white-space:pre-wrap;overflow-wrap:anywhere;font:13px/1.9 ui-monospace,monospace}.material-image{max-width:100%;display:block;margin:12px auto}.material-media{max-width:100%;display:block;margin:20px auto}.material-tools{flex-wrap:wrap;gap:12px}.material-tools>span{overflow-wrap:anywhere}.prompt-card>.material-panel{margin:16px 20px}.highlight-card .material-panel{padding:12px}.follow-banner .button.light{color:#163b31;background:#fff}.follow-banner .button.light:hover{background:#edf5f0}.material-panel .tagline{margin-bottom:8px}@media(max-width:700px){.material-row>div:first-child{flex-basis:100%}.material-tools .demo-actions{width:100%}.material-panel{padding:12px}}

.material-doc-summary{margin:20px;border:1px solid #d8e4dc;padding:14px;border-radius:8px}.material-doc-summary>summary{cursor:pointer;font-weight:700;color:#22553c}