/* DDE Data Portal - rd.dde.ac.cn */
/* =====================================================
       DDE Data Portal — 与官网一致：炭黑 + 橙 + 琥珀
       ===================================================== */
    :root {
      --charcoal: #111111;
      --charcoal-2: #1a1a1a;
      --charcoal-3: #222222;
      --line: #262626;
      --primary: #E85D04;
      --primary-hover: #C44A00;
      --accent: #FDB813;
      --text-body: #c9c9c9;
      --text-muted: #999999;
      --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
      --serif: 'Crimson Pro', Georgia, serif;
      --sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    }

    * { margin: 0; padding: 0; box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body {
      font-family: var(--sans);
      background:
        radial-gradient(1100px 500px at 80% -5%, rgba(232, 93, 4, .14), transparent 60%),
        radial-gradient(900px 420px at 8% 30%, rgba(253, 184, 19, .06), transparent 55%),
        var(--charcoal);
      color: var(--text-body);
      min-height: 100vh;
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }
    img { display: block; max-width: 100%; }
    a { text-decoration: none; color: inherit; }
    button { font-family: inherit; cursor: pointer; border: none; background: none; }
    ul { list-style: none; }

    .header {
      position: sticky; top: 0; z-index: 50;
      backdrop-filter: blur(14px);
      background: rgba(17, 17, 17, .82);
      border-bottom: 1px solid var(--line);
    }
    .header-inner {
      max-width: 1280px; margin: 0 auto; padding: 0 40px;
      height: 64px; display: flex; align-items: center; justify-content: space-between;
    }
    .brand { display: flex; align-items: center; gap: 10px; }
    .brand img { height: 36px; object-fit: contain; }
    .brand .name { font-family: var(--serif); color: #fff; font-size: 21px; font-weight: 600; letter-spacing: .02em; }
    .btn {
      display: inline-flex; align-items: center; gap: 8px;
      padding: 10px 22px; border-radius: 2em; font-size: 14px; font-weight: 600; letter-spacing: .02em;
      transition: all .25s var(--ease-out-expo);
    }
    .btn-dark { background: var(--charcoal-3); color: #fff; border: 1px solid #333; }
    .btn-dark:hover { border-color: var(--primary); transform: translateY(-2px); }
    .btn-primary { background: linear-gradient(120deg, var(--primary), var(--primary-hover)); color: #fff; }
    .btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 28px rgba(232, 93, 4, .35); }

    .hero { max-width: 880px; margin: 0 auto; padding: 64px 24px 30px; text-align: center; }
    .eyebrow { color: var(--primary); font-size: 12.5px; font-weight: 600; letter-spacing: .22em; text-transform: uppercase; }
    .hero h1 {
      font-family: var(--serif); color: #fff; font-weight: 600;
      font-size: clamp(2rem, 4.6vw, 3.4rem); line-height: 1.15; margin: 14px 0 16px;
    }
    .hero p { color: var(--text-muted); font-size: 16.5px; max-width: 640px; margin: 0 auto 34px; }

    .search-wrap { position: relative; max-width: 640px; margin: 0 auto; }
    .search-wrap svg { position: absolute; left: 20px; top: 50%; transform: translateY(-50%); color: #666; }
    .search-wrap input {
      width: 100%; padding: 16px 20px 16px 52px; border-radius: 999px;
      background: var(--charcoal-2); border: 1px solid var(--line); color: #eee; font-size: 15px;
      transition: border-color .25s, box-shadow .25s;
    }
    .search-wrap input::placeholder { color: #666; }
    .search-wrap input:focus {
      outline: none; border-color: var(--primary);
      box-shadow: 0 0 0 4px rgba(232, 93, 4, .16);
    }

    .chips { display: flex; flex-wrap: wrap; justify-content: center; gap: 10px; max-width: 1280px; margin: 30px auto 0; padding: 0 24px; }
    .chip {
      padding: 8px 20px; border-radius: 999px; border: 1px solid var(--line);
      color: var(--text-muted); font-size: 13.5px; letter-spacing: .03em;
      transition: all .25s var(--ease-out-expo);
    }
    .chip:hover { border-color: var(--primary); color: #fff; transform: translateY(-1px); }
    .chip.on { background: linear-gradient(120deg, var(--primary), var(--primary-hover)); border-color: transparent; color: #fff; }

    .grid-wrap { max-width: 1280px; margin: 0 auto; padding: 40px 40px 70px; }
    .grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
    @media (max-width: 1100px) { .grid { grid-template-columns: repeat(3, 1fr); } }
    @media (max-width: 820px) { .grid { grid-template-columns: repeat(2, 1fr); } }
    @media (max-width: 560px) { .grid { grid-template-columns: 1fr; } }

    .card {
      background: var(--charcoal-2); border: 1px solid var(--line); border-radius: 4px;
      overflow: hidden; display: flex; flex-direction: column;
      transition: transform .35s var(--ease-out-expo), border-color .35s, box-shadow .35s;
    }
    .card:hover { transform: translateY(-5px); border-color: rgba(232, 93, 4, .55); box-shadow: 0 24px 50px rgba(0, 0, 0, .45); }
    .card .thumb { position: relative; aspect-ratio: 16 / 9; overflow: hidden; background: #1d1d1d; }
    .card .thumb img { width: 100%; height: 100%; object-fit: cover; opacity: .92; transition: transform .6s var(--ease-out-expo); }
    .card:hover .thumb img { transform: scale(1.05); }
    .card .badge {
      position: absolute; top: 12px; right: 12px;
      background: rgba(17, 17, 17, .85); color: var(--accent);
      border: 1px solid rgba(253, 184, 19, .3);
      padding: 3px 10px; border-radius: 999px; font-size: 11px; letter-spacing: .05em;
    }
    .card .body { padding: 18px 18px 20px; display: flex; flex-direction: column; gap: 9px; flex: 1; }
    .card h3 { font-family: var(--serif); color: #fff; font-size: 19px; font-weight: 600; line-height: 1.35; }
    .card p { font-size: 13.5px; color: var(--text-muted); line-height: 1.6; }
    .card .tags { display: flex; flex-wrap: wrap; gap: 6px; }
    .card .tag { font-size: 11px; color: var(--accent); border: 1px solid rgba(253, 184, 19, .25); padding: 2px 9px; border-radius: 999px; }
    .card .actions { display: flex; gap: 8px; margin-top: auto; padding-top: 10px; }
    .card .actions .btn { flex: 1; justify-content: center; padding: 8px 12px; font-size: 13px; }

    .platform {
      max-width: 1280px; margin: 0 auto; padding: 0 40px 80px;
    }
    .platform-card {
      position: relative; overflow: hidden;
      background: linear-gradient(135deg, #191919 0%, #141414 100%);
      border: 1px solid var(--line); border-radius: 6px; padding: 44px 46px;
    }
    .platform-card::before {
      content: ''; position: absolute; top: -60%; right: -20%; width: 480px; height: 480px;
      background: radial-gradient(circle, rgba(232, 93, 4, .18), transparent 65%); pointer-events: none;
    }
    .platform-inner { position: relative; z-index: 1; display: flex; align-items: center; justify-content: space-between; gap: 30px; flex-wrap: wrap; }
    .platform-inner .badge-row {
      display: inline-flex; align-items: center; gap: 8px; font-size: 13px;
      color: var(--accent); border: 1px solid rgba(253, 184, 19, .3);
      padding: 5px 14px; border-radius: 999px; margin-bottom: 16px;
    }
    .platform-inner h2 { font-family: var(--serif); color: #fff; font-size: 30px; font-weight: 600; margin-bottom: 12px; }
    .platform-inner p { color: var(--text-muted); max-width: 620px; font-size: 15px; }
    .platform-cta { display: flex; gap: 12px; flex-wrap: wrap; }

    @media (max-width: 620px) {
      .header-inner { padding: 0 16px; }
      .brand .name { font-size: 17px; white-space: nowrap; }
      .header .btn { padding: 8px 14px; font-size: 13px; white-space: nowrap; }
      .grid-wrap, .platform { padding-left: 16px; padding-right: 16px; }
      .platform-card { padding: 30px 24px; }
      .hero { padding-top: 44px; }
    }

    footer { border-top: 1px solid var(--line); padding: 30px 40px; }
    .footer-inner {
      max-width: 1280px; margin: 0 auto; display: flex; align-items: center;
      justify-content: space-between; gap: 14px; flex-wrap: wrap;
      color: #666; font-size: 13px;
    }

    /* ---- 弹窗 ---- */
    .modal { position: fixed; inset: 0; z-index: 100; display: none; }
    .modal.open { display: block; }
    .modal .mask { position: absolute; inset: 0; background: rgba(0, 0, 0, .7); backdrop-filter: blur(4px); }
    .modal .panel-wrap { position: absolute; inset: 0; display: flex; align-items: center; justify-content: center; padding: 20px; }
    .panel {
      background: var(--charcoal-2); border: 1px solid #2e2e2e; border-radius: 6px;
      width: 100%; max-width: 780px; max-height: 90vh; overflow-y: auto;
    }
    .panel-hero { position: relative; height: 240px; overflow: hidden; background: #1d1d1d; }
    .panel-hero img { width: 100%; height: 100%; object-fit: cover; opacity: .9; }
    .panel-hero .shade { position: absolute; inset: 0; background: linear-gradient(to top, rgba(17,17,17,.92), transparent 65%); }
    .panel-hero .txt { position: absolute; left: 28px; right: 28px; bottom: 20px; }
    .panel-hero .txt .badge {
      display: inline-block; background: rgba(17,17,17,.85); color: var(--accent);
      border: 1px solid rgba(253,184,19,.3); border-radius: 999px; padding: 3px 12px; font-size: 12px; margin-bottom: 10px;
    }
    .panel-hero h2 { font-family: var(--serif); color: #fff; font-size: 30px; font-weight: 600; line-height: 1.2; }
    .panel .content { padding: 26px 28px 30px; }
    .panel .tags { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 18px; }
    .panel .tag { font-size: 12.5px; color: var(--accent); border: 1px solid rgba(253,184,19,.3); padding: 4px 14px; border-radius: 999px; }
    .panel .desc { font-size: 15px; line-height: 1.75; margin-bottom: 22px; }
    .panel .meta-box { background: var(--charcoal); border: 1px solid var(--line); border-radius: 6px; padding: 18px 20px; margin-bottom: 24px; }
    .panel .meta-box h4 { color: #888; font-size: 11.5px; letter-spacing: .14em; text-transform: uppercase; margin-bottom: 12px; }
    .panel .meta-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
    @media (max-width: 560px) { .panel .meta-grid { grid-template-columns: 1fr; } }
    .panel .meta-item { background: var(--charcoal-3); border-radius: 6px; padding: 10px 14px; }
    .panel .meta-item .k { display: block; font-size: 11px; color: #777; margin-bottom: 2px; }
    .panel .meta-item .v { font-size: 14px; font-weight: 600; color: #eee; }
    .panel .row-btn { display: flex; gap: 12px; }
    .panel .row-btn .btn { flex: 1; justify-content: center; padding: 13px; font-size: 15px; }
    .btn-ghost { background: transparent; color: var(--text-body); border: 1px solid #333; }
    .btn-ghost:hover { border-color: #555; color: #fff; }

    .form label { display: block; font-size: 13.5px; color: #bbb; margin: 14px 0 6px; }
    .form input, .form textarea {
      width: 100%; padding: 11px 14px; border-radius: 6px;
      background: var(--charcoal); border: 1px solid var(--line); color: #eee; font-family: inherit; font-size: 14px;
    }
    .form input:focus, .form textarea:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(232,93,4,.15); }

    .x-btn {
      position: absolute; top: 16px; right: 16px; width: 36px; height: 36px; border-radius: 999px;
      background: rgba(17,17,17,.7); color: #fff; font-size: 18px; line-height: 1;
      display: flex; align-items: center; justify-content: center;
    }
    .x-btn:hover { background: var(--primary); }

    .empty { text-align: center; color: var(--text-muted); padding: 70px 0; }
    .empty .ico { width: 60px; height: 60px; border-radius: 999px; background: var(--charcoal-2); border: 1px solid var(--line); display: flex; align-items: center; justify-content: center; margin: 0 auto 16px; }

    /* ---- 动效（沿用确认版） ---- */
    .reveal { opacity: 0; transform: translateY(48px); transition: opacity .9s var(--ease-out-expo), transform .9s var(--ease-out-expo); }
    .reveal.in-view { opacity: 1; transform: translateY(0); }
    .reveal.d1 { transition-delay: .08s; } .reveal.d2 { transition-delay: .16s; } .reveal.d3 { transition-delay: .24s; }