/* 问测玩验·学习中心 门户样式 v1
   视觉：米白背景 / 深蓝正文 / 少量黄铜金，延续沙盘材质风格
   构建：20261010a */

:root {
  --bg: #f7f4ec;
  --bg-soft: #fdfcf8;
  --ink: #1f3a56;
  --ink-soft: #4a6076;
  --brass: #a8842c;
  --brass-strong: #8a6a1f;
  --line: #e3dcc9;
  --card: #ffffff;
  --ok: #2e7d4f;
  --wait: #a8842c;
  --shadow: 0 2px 10px rgba(31, 58, 86, 0.08);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--ink);
  font-family: "Source Han Sans SC", "Noto Sans SC", "Microsoft YaHei", "PingFang SC", sans-serif;
  font-size: 17px;
  line-height: 1.7;
}

/* ---------- 页头 ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(253, 252, 248, 0.94);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(4px);
}
.header-inner {
  max-width: 1200px; margin: 0 auto; padding: 14px 24px;
  display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 10px;
}
.brand { display: flex; align-items: baseline; gap: 12px; }
.brand-name { font-size: 22px; font-weight: 700; letter-spacing: 2px; color: var(--ink); }
.brand-sub { font-size: 13px; color: var(--brass-strong); letter-spacing: 3px; }
.site-nav { display: flex; gap: 6px; flex-wrap: wrap; }
.site-nav a {
  color: var(--ink-soft); text-decoration: none; font-size: 15px;
  padding: 6px 12px; border-radius: 6px; transition: background .15s;
}
.site-nav a:hover, .site-nav a:focus-visible { background: #efe9d8; color: var(--ink); outline: none; }

/* ---------- 主视觉 ---------- */
.hero {
  max-width: 1200px; margin: 0 auto; padding: 56px 24px 36px;
  display: grid; grid-template-columns: 1.15fr 0.85fr; gap: 40px; align-items: center;
}
.hero-tag {
  display: inline-block; font-size: 14px; letter-spacing: 2px;
  color: var(--brass-strong); border: 1px solid var(--brass);
  border-radius: 999px; padding: 3px 14px; margin-bottom: 18px;
}
.hero h1 { font-size: 40px; line-height: 1.25; margin-bottom: 16px; }
.hero-desc { color: var(--ink-soft); font-size: 18px; max-width: 34em; margin-bottom: 26px; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; align-items: center; margin-bottom: 14px; }
.btn {
  display: inline-block; text-align: center; cursor: pointer;
  font-size: 17px; font-weight: 600; text-decoration: none;
  padding: 12px 30px; border-radius: 8px; border: 1px solid transparent;
  transition: transform .12s, box-shadow .12s, background .15s;
}
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--brass); color: #fff; box-shadow: var(--shadow); }
.btn-primary:hover { background: var(--brass-strong); }
.btn-secondary { background: #fff; color: var(--ink); border-color: var(--line); }
.btn-secondary:hover { border-color: var(--brass); color: var(--brass-strong); }
.btn-tour { background: var(--ink); color: #fdfcf8; }
.btn-tour:hover { background: #16293c; }
.btn-disabled {
  background: #e9e3d2; color: #8a8368; cursor: not-allowed; border: 1px dashed #c9bf9f;
}
.btn-link { color: var(--ink-soft); font-size: 16px; text-decoration: underline; }
.btn-link:hover { color: var(--brass-strong); }
.hero-note { font-size: 14px; color: var(--ink-soft); }

.hero-visual { position: relative; }
.hero-shot {
  width: 100%; border-radius: 12px; border: 1px solid var(--line);
  box-shadow: var(--shadow); display: block; cursor: pointer;
}
.hero-shot-caption { font-size: 13px; color: var(--ink-soft); margin-top: 8px; text-align: center; }

/* ---------- 通用区块 ---------- */
.section { max-width: 1200px; margin: 0 auto; padding: 44px 24px 10px; }
.section-head { margin-bottom: 22px; }
.section-head h2 { font-size: 27px; margin-bottom: 6px; }
.section-head .sub { color: var(--ink-soft); font-size: 16px; }
.kicker {
  font-size: 13px; letter-spacing: 3px; color: var(--brass-strong); margin-bottom: 4px;
}

/* 三步说明 */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.step-card {
  background: var(--card); border: 1px solid var(--line); border-radius: 12px;
  padding: 20px 22px; box-shadow: var(--shadow);
}
.step-card .no {
  display: inline-block; width: 30px; height: 30px; line-height: 30px; text-align: center;
  border-radius: 50%; background: var(--ink); color: #fff; font-weight: 700; margin-bottom: 10px;
}
.step-card h3 { font-size: 19px; margin-bottom: 6px; }
.step-card p { color: var(--ink-soft); font-size: 15.5px; }

/* 课程筛选 */
.filter-bar { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 18px; }
.filter-btn {
  font-size: 15px; padding: 6px 16px; border-radius: 999px;
  border: 1px solid var(--line); background: #fff; color: var(--ink-soft); cursor: pointer;
}
.filter-btn[aria-pressed="true"] { background: var(--ink); color: #fff; border-color: var(--ink); }
.filter-btn:focus-visible { outline: 2px solid var(--brass); outline-offset: 2px; }

/* 课程卡片 */
.course-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.course-card {
  background: var(--card); border: 1px solid var(--line); border-radius: 12px;
  padding: 22px; box-shadow: var(--shadow); display: flex; flex-direction: column; gap: 10px;
  position: relative;
}
.course-card.featured {
  grid-column: 1 / -1;
  border: 1.5px solid var(--brass);
  background: linear-gradient(135deg, #fffdf6 0%, #faf5e6 100%);
  flex-direction: row; align-items: center; gap: 26px; padding: 26px 30px;
}
.course-card.featured .course-main { flex: 1; }
.course-card.hidden-card { display: none; }
.course-cat { font-size: 13px; color: var(--brass-strong); letter-spacing: 1px; }
.course-card h3 { font-size: 20px; }
.course-card.featured h3 { font-size: 25px; }
.course-card p { color: var(--ink-soft); font-size: 15.5px; flex: 1; }
.course-foot { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.badge {
  font-size: 13px; padding: 2px 12px; border-radius: 999px; white-space: nowrap;
}
.badge-wait { background: #f2ead4; color: var(--brass-strong); border: 1px solid #ddcfa3; }
.badge-ok { background: #e2f0e7; color: var(--ok); border: 1px solid #bcdcc7; }
.badge-plan { background: #e8edf3; color: var(--ink-soft); border: 1px solid #ccd7e2; }
.badge-res { background: #e8edf3; color: var(--ink); border: 1px solid #ccd7e2; }
.badge-collab { background: #f5e9d8; color: #7c5a17; border: 1px solid #ddc191; }
.card-btn {
  font-size: 15px; padding: 8px 20px; border-radius: 8px; text-decoration: none;
  border: 1px solid var(--line); background: #fff; color: var(--ink); cursor: pointer;
}
.card-btn:hover, .card-btn:focus-visible { border-color: var(--brass); color: var(--brass-strong); outline: none; }
.card-btn.primary { background: var(--brass); border-color: var(--brass); color: #fff; font-weight: 600; }
.card-btn.primary:hover { background: var(--brass-strong); }
.card-btn.solid-dark { background: var(--ink); border-color: var(--ink); color: #fff; }
.course-card.flash { animation: flashBorder 1.6s ease 2; }
@keyframes flashBorder {
  0%,100% { box-shadow: var(--shadow); }
  50% { box-shadow: 0 0 0 4px rgba(168, 132, 44, 0.45); }
}

/* 合作探索 */
.collab-card {
  background: linear-gradient(135deg, #fffdf6 0%, #f7efdd 100%);
  border: 1.5px solid var(--brass); border-radius: 12px; box-shadow: var(--shadow);
  padding: 26px 30px; display: flex; align-items: center; gap: 26px; flex-wrap: wrap;
}
.collab-card .course-main { flex: 1; min-width: 280px; }
.collab-note { width: 100%; font-size: 14px; color: var(--ink-soft); }

/* 帮助 */
.help-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; }
.help-item {
  background: var(--card); border: 1px solid var(--line); border-radius: 10px;
  padding: 16px 20px; font-size: 15.5px;
}
.help-item b { color: var(--brass-strong); }
.help-item p { color: var(--ink-soft); }

/* ---------- 页脚 ---------- */
.site-footer {
  margin-top: 56px; border-top: 1px solid var(--line); background: var(--bg-soft);
}
.footer-inner { max-width: 1200px; margin: 0 auto; padding: 26px 24px 34px; }
.footer-inner p { font-size: 14px; color: var(--ink-soft); margin-bottom: 6px; }
.footer-inner details { margin-top: 10px; font-size: 14px; color: var(--ink-soft); }
.footer-inner summary { cursor: pointer; color: var(--ink); }
.build-id { font-family: Consolas, monospace; font-size: 13px; }

/* ---------- 详情页 ---------- */
.detail-page { max-width: 860px; margin: 0 auto; padding: 40px 24px 60px; }
.detail-back { margin-bottom: 22px; display: inline-block; }
.detail-page h1 { font-size: 32px; margin: 8px 0 6px; }
.detail-tag { font-size: 14px; letter-spacing: 2px; color: var(--brass-strong); }
.detail-meta { color: var(--ink-soft); font-size: 15px; margin-bottom: 26px; }
.detail-section {
  background: var(--card); border: 1px solid var(--line); border-radius: 12px;
  padding: 24px 28px; margin-bottom: 18px; box-shadow: var(--shadow);
}
.detail-section h2 { font-size: 21px; margin-bottom: 12px; }
.detail-section p, .detail-section li { color: var(--ink-soft); font-size: 16.5px; }
.detail-section ul { padding-left: 22px; }
.detail-section li { margin-bottom: 8px; }
.notice {
  background: #f2ead4; border: 1px solid #ddcfa3; border-radius: 10px;
  padding: 14px 20px; font-size: 15.5px; color: #6d5a20; margin-bottom: 22px;
}
.notice.blue { background: #e8edf3; border-color: #ccd7e2; color: var(--ink-soft); }
.flow-list { list-style: none; padding-left: 0 !important; counter-reset: flow; }
.flow-list li { counter-increment: flow; padding-left: 36px; position: relative; margin-bottom: 12px; }
.flow-list li::before {
  content: counter(flow); position: absolute; left: 0; top: 2px;
  width: 24px; height: 24px; line-height: 24px; text-align: center;
  background: var(--ink); color: #fff; border-radius: 50%; font-size: 13px;
}
.example-quote {
  background: #faf6ea; border-left: 4px solid var(--brass); border-radius: 0 8px 8px 0;
  padding: 12px 18px; margin: 10px 0; font-size: 16px; color: var(--ink);
}

/* ---------- 3D 导览覆盖层 ---------- */
.tour-overlay {
  position: fixed; inset: 0; z-index: 100; display: none; background: #f3efe4;
}
.tour-overlay.on { display: block; }
.tour-topbar {
  position: absolute; top: 0; left: 0; right: 0; z-index: 5;
  display: flex; align-items: center; justify-content: space-between;
  padding: 12px 18px; pointer-events: none;
}
.tour-topbar > * { pointer-events: auto; }
.tour-title { font-size: 16px; font-weight: 600; color: var(--ink); background: rgba(253,252,248,.85); padding: 6px 14px; border-radius: 8px; }
.tour-actions { display: flex; gap: 10px; }
.tour-actions button {
  font-size: 14px; padding: 7px 16px; border-radius: 8px; cursor: pointer;
  border: 1px solid var(--line); background: rgba(253,252,248,.92); color: var(--ink);
}
.tour-actions button:hover { border-color: var(--brass); color: var(--brass-strong); }
.tour-hint {
  position: absolute; bottom: 14px; left: 50%; transform: translateX(-50%); z-index: 5;
  font-size: 14px; color: var(--ink-soft); background: rgba(253,252,248,.85);
  padding: 6px 16px; border-radius: 999px; white-space: nowrap;
}
.tour-canvas { position: absolute; inset: 0; }
.tour-loading {
  position: absolute; inset: 0; display: flex; align-items: center; justify-content: center;
  background: #f3efe4; z-index: 4; font-size: 17px; color: var(--ink-soft);
}
.tour-toast {
  position: absolute; top: 64px; left: 50%; transform: translateX(-50%); z-index: 6;
  background: var(--ink); color: #fff; font-size: 15px; padding: 10px 22px;
  border-radius: 10px; opacity: 0; transition: opacity .25s; pointer-events: none; max-width: 80vw;
}
.tour-toast.on { opacity: 1; }

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  .course-grid { grid-template-columns: repeat(2, 1fr); }
  .hero { grid-template-columns: 1fr; gap: 26px; padding-top: 36px; }
  .hero h1 { font-size: 32px; }
  .steps { grid-template-columns: 1fr; }
  .help-grid { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  body { font-size: 16px; }
  .course-grid { grid-template-columns: 1fr; }
  .course-card.featured { flex-direction: column; align-items: flex-start; }
  .hero h1 { font-size: 27px; }
  .header-inner { justify-content: center; }
}

/* ---------- V1 扩展实验卡片（课程详情页） ---------- */
.v1-exp-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin-top: 14px; }
.v1-exp-card {
  display: flex; flex-direction: column; gap: 8px; padding: 16px 18px;
  border: 1px solid var(--line); border-radius: 12px; background: #fff;
  text-decoration: none; color: inherit; transition: box-shadow .2s, transform .2s;
}
.v1-exp-card:hover { box-shadow: 0 6px 18px rgba(30, 60, 120, .12); transform: translateY(-2px); }
.v1-exp-card b { font-size: 17px; color: var(--ink); }
.v1-exp-card span { font-size: 13.5px; line-height: 1.65; color: #4a5568; }
.v1-exp-card em { font-style: normal; font-size: 12px; color: #8a6a12; background: rgba(200, 160, 40, .1); padding: 3px 8px; border-radius: 6px; align-self: flex-start; }
@media (max-width: 1024px) { .v1-exp-grid { grid-template-columns: 1fr; } }

/* ---------- 首页"探索更多实验"次入口 ---------- */
.more-exp-line { margin-top: 18px; font-size: 14.5px; color: var(--ink); }
.more-exp-line a { color: #2456b8; font-weight: 600; text-decoration: none; border-bottom: 1px dashed rgba(36, 86, 184, .45); }
.more-exp-line a:hover { border-bottom-style: solid; }