/* 和官网 johnathana.ca（classic light 主题）保持一致：海军蓝 + 金色，Playfair Display 标题 + Inter 正文 */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=Playfair+Display:wght@400;700;800&family=Noto+Sans+SC:wght@400;500;700&family=Noto+Serif+SC:wght@600;700&display=swap');
:root {
  --primary: #14294b; --primary-dark: #0c1a33; --primary-light: #1e3a6a;
  --gold: #c9a84c; --gold-light: #dfc06e; --gold-dark: #a6872f;
  --bg: #f9f8f6; --bg-muted: #f0eeea; --panel: #ffffff; --text: #1a1a1a; --text-body: #3d3d3d; --muted: #777777; --border: #e5e5e5;
  --accent: #14294b; --accent-text: #fff; --up: #c41230; --down: #1a8a55; --warn: #a6872f;
  --radius: 12px; --shadow: 0 8px 40px rgba(0,0,0,.08);
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-serif: "Playfair Display", Georgia, "Noto Serif SC", "Songti SC", serif;
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text-body); font: 15px/1.6 var(--font-sans); display: flex; flex-direction: column; min-height: 100vh; }
body > main { flex: 1 0 auto; width: 100%; }
a { color: var(--primary); text-decoration: none; }
a:hover { color: var(--gold-dark); }
h1, h2, h3 { color: var(--primary); }
h1 { font-family: var(--font-serif); font-weight: 700; letter-spacing: -.01em; }
/* 顶部导航：和官网一样的深蓝导航条、校徽 + 校名 */
header.top { display: flex; align-items: center; gap: 24px; padding: 0 clamp(20px, 4vw, 64px); height: 72px; background: var(--primary-dark); border-bottom: 1px solid rgba(255,255,255,.1); position: sticky; top: 0; z-index: 10; color: #fff; }
header.top .brand { display: flex; align-items: center; gap: 12px; color: #fff; text-decoration: none; flex-shrink: 0; }
header.top .brand img { width: 44px; height: 44px; object-fit: contain; }
header.top .brand b { display: block; font-size: 16px; font-weight: 700; line-height: 1.2; }
header.top .brand small { display: block; font-size: .62rem; letter-spacing: .16em; text-transform: uppercase; color: rgba(255,255,255,.55); }
header.top nav { display: flex; gap: 4px; flex: 1; flex-wrap: wrap; justify-content: flex-end; }
header.top nav a { color: rgba(255,255,255,.8); font-size: .82rem; font-weight: 500; padding: 8px 12px; border-radius: 6px; }
header.top nav a:hover { color: #fff; background: rgba(255,255,255,.08); }
header.top nav a.active { color: var(--gold-light); }
.user-box { display: flex; align-items: center; gap: 10px; font-size: .8rem; color: rgba(255,255,255,.7); }
.user-box button { background: transparent; border-color: rgba(255,255,255,.25); color: #fff; padding: 5px 12px; font-size: .8rem; }
.user-box button:hover { background: rgba(255,255,255,.08); }
@media (max-width: 760px) {
  header.top { height: auto; flex-wrap: wrap; gap: 6px 12px; padding: 10px 16px; }
  header.top .brand small { display: none; }
  header.top nav { order: 3; flex-basis: 100%; justify-content: flex-start; margin: 0 -12px; }
  .user-box { margin-left: auto; }
  .user-box span { display: none; }
}
/* 面包屑条：Home › Academics › Virtual Classroom */
.crumbs { background: var(--primary); color: rgba(255,255,255,.7); font-size: .78rem; padding: 10px clamp(20px, 4vw, 64px); }
.crumbs a { color: rgba(255,255,255,.85); }
.crumbs a:hover { color: var(--gold-light); }
/* 页脚：深蓝四栏，金色栏目标题 */
footer.site { background: var(--primary-dark); color: rgba(255,255,255,.7); padding: 56px clamp(20px, 4vw, 64px) 24px; margin-top: 48px; font-size: .82rem; }
footer.site .cols { max-width: 1440px; margin: 0 auto; display: grid; grid-template-columns: 1.5fr 1fr 1fr; gap: 32px; }
@media (max-width: 760px) { footer.site .cols { grid-template-columns: 1fr; } }
footer.site .crest { display: flex; align-items: center; gap: 12px; color: #fff; font-weight: 700; font-size: 16px; }
footer.site .crest img { width: 52px; height: 52px; object-fit: contain; }
footer.site .motto { font-family: var(--font-serif); font-style: italic; color: rgba(255,255,255,.6); margin: 10px 0 0; }
footer.site h4 { color: var(--gold); font-size: .72rem; font-weight: 700; text-transform: uppercase; letter-spacing: .14em; margin: 4px 0 12px; }
footer.site ul { list-style: none; padding: 0; margin: 0; display: grid; gap: 8px; }
footer.site a { color: rgba(255,255,255,.55); }
footer.site a:hover { color: #fff; }
footer.site .bottom { max-width: 1440px; margin: 36px auto 0; padding-top: 18px; border-top: 1px solid rgba(255,255,255,.08); color: rgba(255,255,255,.35); font-size: .72rem; }
main { max-width: 1280px; margin: 0 auto; padding: 32px clamp(16px, 3vw, 32px); }
h1 { font-size: clamp(26px, 3.2vw, 36px); margin: 4px 0 16px; } h2 { font-size: 17px; font-weight: 600; margin: 0 0 10px; }
.panel { background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px; box-shadow: var(--shadow); }
.grid { display: grid; gap: 16px; }
.cards { grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); }
.card { display: block; color: var(--text); transition: border-color .15s; }
.card { border-top: 3px solid transparent; transition: border-color .15s, transform .15s, box-shadow .15s; }
.card:hover { border-top-color: var(--gold); transform: translateY(-2px); box-shadow: 0 12px 40px rgba(12,26,51,.12); }
.card .tag { font-size: .7rem; font-weight: 700; letter-spacing: .12em; text-transform: uppercase; color: var(--gold-dark); }
.card.featured { grid-column: span 2; background: linear-gradient(135deg, var(--primary-dark), var(--primary-light)); color: rgba(255,255,255,.8); border-color: transparent; }
.card.featured h2 { color: #fff; font-family: var(--font-serif); font-size: 22px; } .card.featured .tag { color: var(--gold-light); }
@media (max-width: 640px) { .card.featured { grid-column: auto; } main { padding: 12px 16px; } }
button, .btn { font: inherit; font-size: .88rem; font-weight: 500; padding: 8px 16px; border-radius: 6px; border: 1px solid var(--border); background: var(--panel); color: var(--text); cursor: pointer; display: inline-block; transition: background .15s, border-color .15s; }
button:hover, .btn:hover { border-color: var(--primary); }
button.primary, .btn.primary { background: var(--gold); border-color: var(--gold); color: var(--primary-dark); font-weight: 600; letter-spacing: .03em; }
button.primary:hover, .btn.primary:hover { background: var(--gold-light); border-color: var(--gold-light); color: var(--primary-dark); }
button.buy { background: var(--up); border-color: var(--up); color: #fff; } button.sell { background: var(--down); border-color: var(--down); color: #fff; }
button:disabled { opacity: .5; cursor: not-allowed; }
input, select, textarea { font: inherit; padding: 8px 10px; border-radius: 6px; border: 1px solid var(--border); background: #fff; color: var(--text); }
input:focus, select:focus, textarea:focus { outline: 2px solid color-mix(in srgb, var(--gold) 60%, transparent); outline-offset: 0; border-color: var(--gold); }
label { display: block; font-size: 13px; color: var(--muted); margin: 8px 0 4px; }
.row { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.muted { color: var(--muted); } .small { font-size: 13px; }
.up { color: var(--up); } .down { color: var(--down); }
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th, td { padding: 6px 8px; border-bottom: 1px solid var(--border); text-align: right; white-space: nowrap; }
th:first-child, td:first-child { text-align: left; }
th { color: var(--muted); font-weight: 500; font-size: 13px; }
tr.sel td { background: color-mix(in srgb, var(--accent) 12%, transparent); }
tr.clickable { cursor: pointer; }
.badge { display: inline-block; font-size: 12px; padding: 2px 8px; border-radius: 99px; background: var(--border); }
.badge.running { background: var(--down); color: #fff; } .badge.paused { background: var(--warn); color: #fff; }
.toast { position: fixed; bottom: 20px; left: 50%; transform: translateX(-50%); background: var(--text); color: var(--bg); padding: 10px 18px; border-radius: 8px; opacity: 0; transition: opacity .2s; pointer-events: none; z-index: 100; }
.toast.show { opacity: 1; }
.scroll { overflow: auto; }
.stat { font-size: 22px; font-weight: 600; } .stat-label { font-size: 12px; color: var(--muted); }
.demo-layout { display: grid; grid-template-columns: 280px 1fr; gap: 16px; }
@media (max-width: 800px) { .demo-layout { grid-template-columns: 1fr; } }
.demo-layout canvas { width: 100%; display: block; border-radius: 8px; background: var(--bg); }
input[type=range] { width: 100%; padding: 0; accent-color: var(--primary); }
input[type=checkbox], input[type=radio] { accent-color: var(--primary); }
.slider-val { float: right; color: var(--text); font-variant-numeric: tabular-nums; }
[hidden] { display: none !important; }
.ai-answer { white-space: pre-wrap; line-height: 1.7; margin-top: 10px; }
.ai-answer.loading { color: var(--muted); }
.tabs { display: flex; gap: 4px; border-bottom: 1px solid var(--border); margin: 0 0 8px; }
.tabs a { padding: 8px 14px; color: var(--muted); border-bottom: 2px solid transparent; }
.tabs a.active { color: var(--primary); border-color: var(--gold); font-weight: 600; }
h2.unit { margin: 22px 0 10px; }
.card h3 { margin: 2px 0 6px; font-size: 16px; }
.card p { margin: 0; }
.chip { display: inline-block; padding: 2px 10px; margin: 2px 0; border: 1px solid var(--border); border-radius: 99px; font-size: 13px; }
label.check { display: flex; gap: 6px; align-items: center; color: var(--text); }
.lab-info { line-height: 1.7; }
.lab-info h3 { margin: 0 0 6px; font-size: 15px; }
.lab-side table td:last-child { font-variant-numeric: tabular-nums; }
.lab-side td { white-space: normal; }
.lab-side td:last-child { min-width: 80px; }
.join-modal { position: fixed; inset: 0; background: rgba(5,8,14,.72); display: flex; align-items: center; justify-content: center; z-index: 50; padding: 16px; }
.join-box { background: var(--panel); color: var(--text); border: 1px solid var(--border); border-radius: 14px; padding: 28px 32px; max-width: 640px; width: 100%; text-align: center; }
.join-label { font-size: 15px; margin-top: 6px; }
.join-code { font: 700 clamp(48px, 12vw, 96px)/1.1 ui-monospace, monospace; letter-spacing: .18em; margin: 10px 0 14px; color: var(--primary); }
.join-link code { display: inline-block; padding: 6px 10px; border-radius: 6px; background: var(--bg); border: 1px solid var(--border); word-break: break-all; font-size: 14px; }
.code-cell { font-family: ui-monospace, monospace; font-weight: 700; letter-spacing: 2px; }
.class-cards { display: grid; gap: 14px; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); }
.class-card { border: 1px solid var(--border); border-top: 3px solid var(--gold); border-radius: 10px; padding: 14px 16px; background: var(--panel); }
.cc-head { display: flex; justify-content: space-between; align-items: center; gap: 8px; color: var(--primary); }
.cc-code-label { font-size: .7rem; font-weight: 700; letter-spacing: .12em; text-transform: uppercase; color: var(--gold-dark); margin-top: 10px; }
.cc-code { font: 700 36px/1.15 ui-monospace, monospace; letter-spacing: .14em; color: var(--primary); margin: 2px 0 4px; }
.join-qr { margin: 4px 0 12px; } .join-qr img { display: block; margin: 0 auto 4px; border: 1px solid var(--border); border-radius: 8px; padding: 6px; background: #fff; }
/* 登录页 / 落地页：和官网内页一样的深蓝大标题区 */
.hero { background: linear-gradient(135deg, rgba(12,26,51,.96), rgba(30,58,106,.92)), radial-gradient(circle at 80% 20%, rgba(201,168,76,.25), transparent 50%); color: #fff; padding: clamp(48px, 8vw, 96px) clamp(20px, 4vw, 64px); }
.hero-in { max-width: 900px; margin: 0 auto; }
.hero-kicker { font-size: .72rem; font-weight: 700; letter-spacing: .16em; text-transform: uppercase; color: var(--gold-light); }
.hero h1 { color: #fff; font-size: clamp(36px, 5.5vw, 60px); font-weight: 800; margin: 10px 0 14px; }
.hero-sub { font-size: clamp(16px, 1.6vw, 19px); color: rgba(255,255,255,.8); max-width: 720px; line-height: 1.6; margin: 0 0 28px; }
.hero-btn { padding: 14px 28px; font-size: .95rem; }
.hero-note { font-size: .8rem; color: rgba(255,255,255,.55); margin: 14px 0 0; }
.features { display: grid; gap: 20px; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); margin: 8px 0 24px; }
.feature { background: var(--panel); border-radius: 12px; padding: 22px; box-shadow: var(--shadow); border-top: 3px solid var(--gold); }
.feature h3 { margin: 6px 0 8px; font-size: 17px; }
.feature p { margin: 0; color: var(--text-body); }
.f-num { font-family: var(--font-serif); font-size: 30px; font-weight: 800; color: var(--primary); }
.model-search { margin: 4px 0 16px; }
.model-search input { width: 100%; max-width: 560px; padding: 11px 14px 11px 40px; border-radius: 8px; font-size: 15px; background: #fff url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='18' height='18' fill='none' stroke='%23777' stroke-width='2' viewBox='0 0 24 24'%3E%3Ccircle cx='11' cy='11' r='7'/%3E%3Cpath d='m20 20-3.5-3.5'/%3E%3C/svg%3E") no-repeat 13px center; }
.home-search { margin: 0 0 22px; display: flex; gap: 8px; flex-wrap: wrap; }
.home-search input { flex: 1 1 260px; max-width: 560px; }
.card .used-in { color: var(--gold-dark); margin: 6px 0 0; }

/* CSEEC 网站下（www.cseec.ca）：深蓝 + 枫叶红，白色页首、浅色页脚加红色上边，和 cseec.ca 一致 */
html[data-brand=cseec] {
  --primary: #1b2433; --primary-dark: #111823; --primary-light: #2a3649;
  --gold: #c8202f; --gold-light: #e0414e; --gold-dark: #a51a27;
  --bg: #ffffff; --bg-muted: #efede8; --text-body: #3f4248; --muted: #767a82; --border: #e6e3dd;
  --accent: #1b2433; --warn: #b8913a;
}
html[data-brand=cseec] body:not(.terminal) header.top { background: rgba(255,255,255,.97); backdrop-filter: blur(12px); border-bottom: 1px solid var(--border); color: var(--primary); box-shadow: 0 1px 0 rgba(0,0,0,.02); }
html[data-brand=cseec] body:not(.terminal) header.top .brand { color: var(--primary); }
html[data-brand=cseec] header.top .brand img { width: 52px; height: 52px; border-radius: 50%; background: #fff; padding: 3px; box-shadow: 0 2px 8px rgba(0,0,0,.12); }
html[data-brand=cseec] header.top .brand b { font-size: 1.15rem; }
html[data-brand=cseec] body:not(.terminal) header.top .brand small { color: var(--muted); letter-spacing: .12em; }
html[data-brand=cseec] body:not(.terminal) header.top nav a { color: var(--text-body); }
html[data-brand=cseec] body:not(.terminal) header.top nav a:hover { color: var(--primary); background: var(--bg-muted); }
html[data-brand=cseec] body:not(.terminal) header.top nav a.active { color: var(--gold); }
html[data-brand=cseec] body:not(.terminal) .user-box { color: var(--muted); }
html[data-brand=cseec] body:not(.terminal) .user-box button { border-color: var(--border); color: var(--primary); }
html[data-brand=cseec] body:not(.terminal) .user-box button:hover { border-color: var(--primary); }
html[data-brand=cseec] .crumbs { background: var(--bg-muted); color: var(--muted); border-bottom: 1px solid var(--border); }
html[data-brand=cseec] .crumbs a { color: var(--primary); }
html[data-brand=cseec] .crumbs a:hover { color: var(--gold); }
html[data-brand=cseec] button.primary, html[data-brand=cseec] .btn.primary { color: #fff; }
html[data-brand=cseec] button.primary:hover, html[data-brand=cseec] .btn.primary:hover { color: #fff; }
html[data-brand=cseec] .hero { background: linear-gradient(135deg, rgba(17,24,35,.96), rgba(42,54,73,.92)), radial-gradient(circle at 80% 20%, rgba(200,32,47,.25), transparent 50%); }
html[data-brand=cseec] .hero-kicker, html[data-brand=cseec] .card.featured .tag { color: #d9b45a; }
html[data-brand=cseec] footer.site { background: var(--bg-muted); color: var(--text-body); border-top: 4px solid var(--gold); }
html[data-brand=cseec] footer.site .crest { color: var(--primary); font-family: var(--font-serif); font-size: 18px; }
html[data-brand=cseec] footer.site .crest img { width: 72px; height: 72px; border-radius: 50%; background: #fff; padding: 3px; box-shadow: 0 2px 8px rgba(0,0,0,.1); }
html[data-brand=cseec] footer.site .motto { color: var(--text-body); font-style: normal; font-family: var(--font-sans); }
html[data-brand=cseec] footer.site .tagline { color: var(--gold); font-weight: 600; font-size: .78rem; letter-spacing: .06em; margin: 6px 0 0; }
html[data-brand=cseec] footer.site h4 { color: var(--primary); }
html[data-brand=cseec] footer.site a { color: var(--text-body); }
html[data-brand=cseec] footer.site a:hover { color: var(--gold); }
html[data-brand=cseec] footer.site .bottom { border-top-color: var(--border); color: var(--muted); display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.guide summary { cursor: pointer; color: var(--primary); font-size: 16px; }
.guide[open] summary { margin-bottom: 10px; }
.guide-steps { margin: 0 0 10px; padding-left: 22px; display: grid; gap: 10px; }
.guide-steps li b { display: block; color: var(--primary); }
.guide-steps li span { color: var(--text-body); font-size: 14px; }
.templates button.active { border-color: var(--gold); box-shadow: inset 0 0 0 1px var(--gold); }