:root {
      --bg: #060d18;
      --bg-panel: rgba(12, 24, 42, 0.72);
      --bg-card: rgba(14, 30, 52, 0.55);
      --text: #e8f2ff;
      --text-dim: #7a9ab8;
      --text-muted: #4d6a85;
      --cyan: #00e5c3;
      --cyan-dim: rgba(0, 229, 195, 0.15);
      --blue: #3b9eff;
      --line: rgba(59, 158, 255, 0.12);
      --line-bright: rgba(0, 229, 195, 0.35);
      --glow: 0 0 40px rgba(0, 229, 195, 0.12);
      --radius: 14px;
      --font: "Noto Sans SC", sans-serif;
      --font-tech: "Exo 2", sans-serif;
      --ease: cubic-bezier(0.16, 1, 0.3, 1);
      --header-h: 64px;
      --content-w: 1120px;
      --section-gap: 3.25rem;
      --card-min: 280px;
      --card-max: 300px;
    }

    *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
    html { scroll-behavior: smooth; }

    body {
      font-family: var(--font);
      background: var(--bg);
      color: var(--text);
      min-height: 100vh;
      overflow-x: hidden;
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

    /* ── 背景：太空俯瞰地球 ── */
    .scene {
      position: fixed;
      inset: 0;
      z-index: 0;
      pointer-events: none;
      overflow: hidden;
    }

    .scene__sky {
      position: absolute;
      inset: 0;
      background:
        radial-gradient(ellipse 120% 80% at 50% 120%, rgba(0, 80, 100, 0.35) 0%, transparent 55%),
        linear-gradient(180deg, #010409 0%, #051018 22%, #0a2540 50%, #0f3d5c 78%, #145a75 100%);
    }

    .scene__stars {
      position: absolute;
      inset: 0;
      width: 100%;
      height: 100%;
      opacity: 0.85;
    }

    .scene__aurora {
      position: absolute;
      inset: -20%;
      background:
        radial-gradient(ellipse 45% 35% at 15% 25%, rgba(0, 229, 195, 0.14) 0%, transparent 70%),
        radial-gradient(ellipse 40% 30% at 85% 20%, rgba(59, 158, 255, 0.12) 0%, transparent 65%),
        radial-gradient(ellipse 35% 25% at 50% 10%, rgba(120, 80, 255, 0.06) 0%, transparent 60%);
      animation: aurora-drift 14s ease-in-out infinite alternate;
      filter: blur(28px);
    }

    @keyframes aurora-drift {
      0%   { transform: translate(0, 0) scale(1); opacity: 0.7; }
      100% { transform: translate(2%, 3%) scale(1.05); opacity: 1; }
    }

    .scene__flare {
      position: absolute;
      top: -20%;
      left: 50%;
      transform: translateX(-50%);
      width: 140vmax;
      height: 70vmax;
      background: radial-gradient(
        ellipse 50% 45% at 50% 100%,
        rgba(255, 200, 120, 0.22) 0%,
        rgba(0, 229, 195, 0.1) 25%,
        rgba(59, 158, 255, 0.04) 45%,
        transparent 70%
      );
      animation: flare-pulse 6s ease-in-out infinite;
    }

    @keyframes flare-pulse {
      0%, 100% { opacity: 0.75; transform: translateX(-50%) scale(1); }
      50%       { opacity: 1;    transform: translateX(-50%) scale(1.04); }
    }

    .scene__sunrise {
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      height: 60%;
      background: radial-gradient(
        ellipse 70% 55% at 50% 0%,
        rgba(255, 210, 140, 0.12) 0%,
        rgba(0, 229, 195, 0.06) 30%,
        transparent 65%
      );
    }

    .scene__earth-wrap {
      position: absolute;
      left: 50%;
      bottom: -48%;
      transform: translateX(-50%);
      width: 175vmax;
      height: 175vmax;
    }

    .scene__earth {
      position: absolute;
      inset: 0;
      border-radius: 50%;
      background: radial-gradient(
        circle at 36% 34%,
        #248f7a 0%,
        #156080 16%,
        #0c4560 36%,
        #072d48 56%,
        #041828 100%
      );
      box-shadow:
        inset -30px -30px 80px rgba(0, 0, 0, 0.5),
        inset 20px 20px 60px rgba(0, 200, 180, 0.08),
        0 -12px 100px rgba(0, 220, 190, 0.12),
        0 -4px 200px rgba(59, 158, 255, 0.08);
      animation: earth-glow 5s ease-in-out infinite;
    }

    @keyframes earth-glow {
      0%, 100% { filter: brightness(1); }
      50%       { filter: brightness(1.08); }
    }

    .scene__land {
      position: absolute;
      inset: 0;
      border-radius: 50%;
      opacity: 0.95;
      background:
        radial-gradient(ellipse 12% 10% at 28% 35%, rgba(60, 200, 120, 0.65) 0%, transparent 100%),
        radial-gradient(ellipse 6% 13% at 30% 49%, rgba(55, 185, 110, 0.5) 0%, transparent 100%),
        radial-gradient(ellipse 9% 15% at 47% 38%, rgba(50, 175, 105, 0.55) 0%, transparent 100%),
        radial-gradient(ellipse 16% 9% at 63% 33%, rgba(58, 190, 115, 0.6) 0%, transparent 100%),
        radial-gradient(ellipse 11% 7% at 73% 37%, rgba(52, 170, 100, 0.45) 0%, transparent 100%),
        radial-gradient(ellipse 5% 4% at 77% 50%, rgba(48, 160, 95, 0.35) 0%, transparent 100%);
    }

    .scene__clouds {
      position: absolute;
      inset: 0;
      border-radius: 50%;
      opacity: 0.25;
      background:
        radial-gradient(ellipse 8% 3% at 40% 42%, rgba(255,255,255,0.5) 0%, transparent 100%),
        radial-gradient(ellipse 6% 2% at 55% 38%, rgba(255,255,255,0.4) 0%, transparent 100%),
        radial-gradient(ellipse 10% 3% at 65% 45%, rgba(255,255,255,0.35) 0%, transparent 100%);
      animation: cloud-drift 30s linear infinite;
    }

    @keyframes cloud-drift {
      from { transform: rotate(0deg); }
      to   { transform: rotate(360deg); }
    }

    .scene__atmo-rim {
      position: absolute;
      inset: 0;
      border-radius: 50%;
      background:
        radial-gradient(circle at 50% 0%, transparent 48.5%, rgba(160, 240, 255, 0.35) 49.2%, rgba(80, 210, 255, 0.12) 50%, transparent 51.8%),
        radial-gradient(circle at 50% 0%, transparent 48%, rgba(0, 229, 195, 0.08) 49%, transparent 52%);
      animation: atmo-pulse 4s ease-in-out infinite;
    }

    @keyframes atmo-pulse {
      0%, 100% { opacity: 0.85; }
      50%       { opacity: 1; }
    }

    .scene__orbit {
      position: absolute;
      left: 50%;
      bottom: -2%;
      transform: translateX(-50%);
      width: min(1200px, 140vw);
      height: 280px;
      opacity: 0.7;
    }

    .scene__orbit ellipse {
      fill: none;
      stroke: rgba(0, 229, 195, 0.18);
      stroke-width: 1;
    }

    .scene__orbit .satellite {
      fill: var(--cyan);
      filter: drop-shadow(0 0 6px var(--cyan));
    }

    .scene__sweep {
      position: absolute;
      inset: 0;
      background: linear-gradient(
        108deg,
        transparent 42%,
        rgba(255, 255, 255, 0.025) 50%,
        transparent 58%
      );
      animation: light-sweep 10s ease-in-out infinite;
    }

    @keyframes light-sweep {
      0%   { transform: translateX(-80%) skewX(-8deg); opacity: 0; }
      15%  { opacity: 1; }
      85%  { opacity: 1; }
      100% { transform: translateX(80%) skewX(-8deg); opacity: 0; }
    }

    .scene__haze {
      position: absolute;
      left: 0;
      right: 0;
      bottom: 0;
      height: 50%;
      background: linear-gradient(
        0deg,
        rgba(4, 10, 20, 0.92) 0%,
        rgba(4, 10, 20, 0.45) 45%,
        transparent 100%
      );
    }

    .scene__vignette {
      position: absolute;
      inset: 0;
      background: radial-gradient(ellipse 75% 65% at 50% 35%, transparent 35%, rgba(2, 6, 14, 0.65) 100%);
    }

    @media (prefers-reduced-motion: reduce) {
      .scene__aurora, .scene__flare, .scene__earth, .scene__clouds,
      .scene__atmo-rim, .scene__sweep, .hero__halo, .hero__title,
      .hero__badge, .hero__desc, .modal-overlay, .modal-dialog {
        animation: none !important;
      }
    }

    /* ── 顶栏 ── */
    .header {
      position: fixed;
      top: 0; left: 0; right: 0;
      z-index: 100;
      height: var(--header-h);
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 2rem;
      background: rgba(6, 13, 24, 0.75);
      backdrop-filter: blur(20px) saturate(1.4);
      border-bottom: 1px solid var(--line);
    }

    .logo {
      flex-shrink: 0;
      display: flex;
      align-items: center;
      gap: 0.75rem;
      text-decoration: none;
      color: var(--text);
      z-index: 1;
    }

    .logo__orb {
      width: 36px;
      height: 36px;
      position: relative;
    }

    .logo__orb svg {
      width: 100%;
      height: 100%;
      animation: spin-slow 40s linear infinite;
    }

    @keyframes spin-slow {
      to { transform: rotate(360deg); }
    }

    .logo__text {
      font-size: 1.15rem;
      font-weight: 700;
      letter-spacing: 0.18em;
    }

    .logo__text span { color: var(--cyan); }

    .header__nav {
      position: absolute;
      left: 50%;
      transform: translateX(-50%);
      display: flex;
      gap: 0.25rem;
    }

    .header__nav a {
      padding: 0.45rem 0.9rem;
      border-radius: 8px;
      font-size: 0.78rem;
      font-weight: 400;
      letter-spacing: 0.06em;
      color: var(--text-dim);
      text-decoration: none;
      border: 1px solid transparent;
      transition: all 0.3s var(--ease);
    }

    .header__nav a:hover {
      color: var(--text);
      background: rgba(59, 158, 255, 0.08);
      border-color: var(--line);
    }

    .header__nav a.active {
      color: var(--cyan);
      background: var(--cyan-dim);
      border-color: rgba(0, 229, 195, 0.25);
    }

    .header__actions {
      display: flex;
      align-items: center;
      gap: 0.35rem;
      flex-shrink: 0;
      z-index: 1;
    }

    .header__copyright {
      flex-shrink: 0;
      z-index: 1;
      padding: 0.45rem 0.85rem;
      border-radius: 8px;
      font-family: var(--font);
      font-size: 0.72rem;
      font-weight: 500;
      letter-spacing: 0.06em;
      color: var(--text-dim);
      background: rgba(59, 158, 255, 0.06);
      border: 1px solid var(--line);
      cursor: pointer;
      transition: all 0.3s var(--ease);
      white-space: nowrap;
    }

    .header__copyright:hover {
      color: var(--cyan);
      border-color: rgba(0, 229, 195, 0.3);
      background: var(--cyan-dim);
    }

    .header__music-toggle {
      flex-shrink: 0;
      z-index: 1;
      display: inline-flex;
      align-items: center;
      gap: 0.4rem;
      padding: 0.45rem 0.85rem;
      border-radius: 8px;
      font-family: var(--font);
      font-size: 0.72rem;
      font-weight: 500;
      letter-spacing: 0.06em;
      color: var(--text-dim);
      background: rgba(59, 158, 255, 0.06);
      border: 1px solid var(--line);
      cursor: pointer;
      transition: all 0.3s var(--ease);
      white-space: nowrap;
      user-select: none;
    }

    .header__music-toggle:hover {
      color: var(--cyan);
      border-color: rgba(0, 229, 195, 0.3);
      background: var(--cyan-dim);
    }

    .header__music-toggle input[type="checkbox"] {
      display: none;
    }

    .header__music-icon {
      width: 14px;
      height: 14px;
      flex-shrink: 0;
      border-radius: 3px;
      border: 1.5px solid rgba(0, 229, 195, 0.5);
      background: transparent;
      position: relative;
      transition: all 0.25s var(--ease);
    }

    .header__music-toggle input:checked + .header__music-icon {
      background: var(--cyan);
      border-color: var(--cyan);
    }

    .header__music-toggle input:checked + .header__music-icon::after {
      content: "";
      position: absolute;
      left: 3px;
      top: 1px;
      width: 5px;
      height: 8px;
      border: solid #060d18;
      border-width: 0 2px 2px 0;
      transform: rotate(45deg);
    }

    .header__music-note {
      width: 16px;
      height: 16px;
      flex-shrink: 0;
      opacity: 0.75;
      transition: opacity 0.3s var(--ease);
    }

    .header__music-toggle:hover .header__music-note {
      opacity: 1;
    }

    /* ── 版权弹窗 ── */
    body.modal-open {
      overflow: hidden;
    }

    .modal-overlay {
      position: fixed;
      inset: 0;
      z-index: 20000;
      display: flex;
      align-items: center;
      justify-content: center;
      padding: 16px;
      background: rgba(4, 10, 20, 0.42);
      backdrop-filter: blur(14px) saturate(1.25);
      -webkit-backdrop-filter: blur(14px) saturate(1.25);
      box-sizing: border-box;
      font-family: var(--font);
      animation: modal-fade-in 0.3s var(--ease);
    }

    .modal-overlay[hidden] { display: none !important; }

    @keyframes modal-fade-in {
      from { opacity: 0; }
      to   { opacity: 1; }
    }

    @keyframes modal-rise {
      from { opacity: 0; transform: translateY(16px) scale(0.98); }
      to   { opacity: 1; transform: translateY(0) scale(1); }
    }

    .modal-dialog {
      position: relative;
      width: 100%;
      max-width: 380px;
      padding: 22px 20px 20px;
      border-radius: var(--radius);
      background: linear-gradient(155deg, rgba(14, 30, 52, 0.88) 0%, rgba(8, 18, 32, 0.92) 100%);
      border: 1px solid rgba(59, 158, 255, 0.22);
      box-shadow:
        var(--glow),
        0 24px 60px rgba(0, 0, 0, 0.45),
        inset 0 1px 0 rgba(255, 255, 255, 0.06);
      backdrop-filter: blur(24px) saturate(1.35);
      -webkit-backdrop-filter: blur(24px) saturate(1.35);
      color: var(--text);
      overflow: hidden;
      animation: modal-rise 0.35s var(--ease);
    }

    .modal-dialog::before {
      content: "";
      position: absolute;
      inset: 0;
      background:
        radial-gradient(ellipse 90% 55% at 50% -10%, rgba(0, 229, 195, 0.14) 0%, transparent 58%),
        radial-gradient(ellipse 50% 40% at 100% 100%, rgba(59, 158, 255, 0.1) 0%, transparent 55%),
        radial-gradient(ellipse 40% 35% at 0% 80%, rgba(120, 80, 255, 0.06) 0%, transparent 50%);
      pointer-events: none;
    }

    .modal-dialog::after {
      content: "";
      position: absolute;
      top: 0;
      left: 12%;
      right: 12%;
      height: 1px;
      background: linear-gradient(90deg, transparent, rgba(0, 229, 195, 0.45), transparent);
      pointer-events: none;
    }

    .modal-dialog > * {
      position: relative;
      z-index: 1;
    }

    .copyright-modal { max-width: 440px; }

    .sponsor-modal { max-width: 460px; }

    .sponsor-qr {
      margin: 0 0 14px;
      text-align: center;
    }

    .sponsor-note {
      text-align: left;
      line-height: 1.75;
    }

    .sponsor-once-tip {
      margin: 12px 0 0;
      padding-top: 12px;
      border-top: 1px solid var(--line);
      font-size: 0.74rem;
      text-align: center;
      color: var(--text-muted);
      line-height: 1.6;
    }

    .modal-title {
      margin: 0 0 16px;
      font-size: 1.05rem;
      font-weight: 600;
      letter-spacing: 0.12em;
      color: var(--cyan);
      text-align: center;
      text-shadow: 0 0 24px rgba(0, 229, 195, 0.25);
    }

    .copyright-qr-grid {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      align-items: flex-start;
      gap: 14px 16px;
      margin-bottom: 14px;
    }

    .copyright-qr-item {
      margin: 0;
      flex: 1 1 150px;
      max-width: 200px;
      min-width: 0;
      text-align: center;
    }

    .copyright-qr-caption {
      margin: 8px 0 0;
      font-size: 0.75rem;
      line-height: 1.35;
      color: var(--text-muted);
    }

    .copyright-qr-image {
      display: block;
      width: 100%;
      max-width: 200px;
      height: auto;
      margin: 0 auto;
      border-radius: 10px;
      border: 1px solid rgba(0, 229, 195, 0.18);
      box-shadow: 0 8px 24px rgba(0, 0, 0, 0.25);
      background: rgba(255, 255, 255, 0.04);
    }

    .copyright-note {
      margin: 0;
      font-size: 0.8rem;
      line-height: 1.65;
      color: var(--text-dim);
      text-align: center;
    }

    .modal-actions {
      display: flex;
      gap: 10px;
      margin-top: 18px;
      justify-content: center;
    }

    .modal-btn {
      padding: 8px 22px;
      font-size: 0.84rem;
      border-radius: 8px;
      cursor: pointer;
      border: 1px solid rgba(59, 158, 255, 0.25);
      background: rgba(12, 28, 48, 0.75);
      color: var(--text);
      font-family: inherit;
      transition: background 0.25s, border-color 0.25s, color 0.25s, box-shadow 0.25s;
    }

    .modal-btn:hover {
      border-color: var(--cyan);
      background: rgba(0, 229, 195, 0.12);
      box-shadow: 0 0 20px rgba(0, 229, 195, 0.15);
    }

    .modal-btn-primary {
      border-color: rgba(0, 229, 195, 0.45);
      color: var(--cyan);
      background: rgba(0, 229, 195, 0.08);
    }

    /* ── Hero ── */
    .hero {
      position: relative;
      z-index: 1;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: flex-start;
      padding: calc(var(--header-h) + 1.5rem) 2rem 2rem;
      margin-bottom: 0.25rem;
      text-align: center;
      overflow: hidden;
    }

    .hero__halo {
      position: absolute;
      top: 50%;
      left: 50%;
      transform: translate(-50%, -55%);
      width: min(680px, 90vw);
      height: min(680px, 90vw);
      border-radius: 50%;
      background: radial-gradient(circle, rgba(0, 229, 195, 0.1) 0%, rgba(59, 158, 255, 0.04) 35%, transparent 65%);
      animation: halo-breathe 5s ease-in-out infinite;
      pointer-events: none;
    }

    .hero__halo::before {
      content: "";
      position: absolute;
      inset: 18%;
      border-radius: 50%;
      border: 1px solid rgba(0, 229, 195, 0.12);
      animation: spin-slow 50s linear infinite;
    }

    .hero__halo::after {
      content: "";
      position: absolute;
      inset: 28%;
      border-radius: 50%;
      border: 1px dashed rgba(59, 158, 255, 0.1);
      animation: spin-slow 80s linear infinite reverse;
    }

    @keyframes halo-breathe {
      0%, 100% { transform: translate(-50%, -55%) scale(1); opacity: 0.8; }
      50%       { transform: translate(-50%, -55%) scale(1.06); opacity: 1; }
    }

    @keyframes hero-rise {
      from { opacity: 0; transform: translateY(32px); }
      to   { opacity: 1; transform: translateY(0); }
    }

    .hero__badge {
      position: relative;
      z-index: 1;
      display: inline-flex;
      align-items: center;
      gap: 0.6rem;
      padding: 0.4rem 1rem;
      margin-bottom: 0.85rem;
      border-radius: 999px;
      border: 1px solid rgba(0, 229, 195, 0.35);
      background: rgba(0, 229, 195, 0.08);
      backdrop-filter: blur(8px);
      font-family: var(--font-tech);
      font-size: 0.68rem;
      font-weight: 400;
      letter-spacing: 0.2em;
      color: var(--cyan);
      text-transform: uppercase;
      box-shadow: 0 0 24px rgba(0, 229, 195, 0.12);
      animation: hero-rise 1s var(--ease) 0.1s both;
    }

    .hero__badge::before {
      content: "";
      width: 6px; height: 6px;
      border-radius: 50%;
      background: var(--cyan);
      box-shadow: 0 0 10px var(--cyan);
      animation: blink 2s ease infinite;
    }

    @keyframes blink {
      0%, 100% { opacity: 1; }
      50%       { opacity: 0.3; }
    }

    .hero__title {
      position: relative;
      z-index: 1;
      font-size: clamp(3rem, 8vw, 5rem);
      font-weight: 700;
      letter-spacing: 0.22em;
      line-height: 1.15;
      margin-bottom: 0.65rem;
      background: linear-gradient(120deg, #ffffff 0%, #c8eeff 25%, var(--cyan) 50%, #b8e8ff 75%, #ffffff 100%);
      background-size: 200% auto;
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      filter: drop-shadow(0 0 40px rgba(0, 229, 195, 0.35));
      animation: hero-rise 1.1s var(--ease) 0.25s both, title-shimmer 7s linear 1.2s infinite;
    }

    @keyframes title-shimmer {
      to { background-position: 200% center; }
    }

    .hero__desc {
      position: relative;
      z-index: 1;
      max-width: 520px;
      font-size: 0.95rem;
      font-weight: 300;
      color: var(--text-dim);
      letter-spacing: 0.08em;
      line-height: 1.85;
      animation: hero-rise 1s var(--ease) 0.45s both;
    }

    /* ── 主内容 ── */
    .content {
      position: relative;
      z-index: 1;
      max-width: var(--content-w);
      margin: 0 auto;
      padding: 0 2rem 4rem;
    }

    .content__bottom {
      margin-top: 1.5rem;
      padding-top: 2rem;
      border-top: 1px solid var(--line);
    }

    .content__footer-note {
      margin: 0;
      text-align: center;
      font-size: 0.86rem;
      font-weight: 300;
      letter-spacing: 0.1em;
      color: var(--text-muted);
    }

    .site-footer {
      margin-top: 1.25rem;
      text-align: center;
    }

    .site-footer__info,
    .site-footer__pageview {
      margin: 0.45rem 0;
      font-size: 0.82rem;
      font-weight: 300;
      line-height: 1.7;
      color: var(--text-dim);
    }

    .site-footer__info a {
      color: var(--text-muted);
      text-decoration: none;
      transition: color 0.2s var(--ease);
    }

    .site-footer__info a:hover {
      color: var(--cyan);
      text-decoration: underline;
    }

    .site-footer__sep {
      margin: 0 0.35rem;
      opacity: 0.45;
    }

    .site-footer__pageview {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 0.35rem;
      font-size: 0.78rem;
      color: var(--text-muted);
      opacity: 0.9;
    }

    .site-footer__eye {
      width: 14px;
      height: 14px;
      opacity: 0.75;
      flex-shrink: 0;
    }

    .about-us-modal { max-width: 400px; }

    .about-us-qr {
      margin: 0 0 14px;
      text-align: center;
    }

    .about-us-qr__image {
      display: block;
      width: 100%;
      max-width: 200px;
      height: auto;
      margin: 0 auto;
      border-radius: 10px;
      border: 1px solid rgba(0, 229, 195, 0.18);
      box-shadow: 0 8px 24px rgba(0, 0, 0, 0.25);
      background: rgba(255, 255, 255, 0.04);
    }

    .about-us-text {
      margin: 0;
      font-size: 0.8rem;
      line-height: 1.65;
      color: var(--text-dim);
      text-align: center;
    }

    .section {
      scroll-margin-top: calc(var(--header-h) + 1rem);
      margin-bottom: var(--section-gap);
    }

    .content > .section:first-child {
      margin-top: 0;
    }

    .section__head {
      display: flex;
      flex-direction: row;
      align-items: center;
      justify-content: center;
      gap: 0.75rem;
      margin-bottom: 1.35rem;
      padding-bottom: 1rem;
      border-bottom: 1px solid var(--line);
    }

    .section__icon {
      width: 40px;
      height: 40px;
      border-radius: 10px;
      display: flex;
      align-items: center;
      justify-content: center;
      background: var(--mod-bg, var(--cyan-dim));
      border: 1px solid var(--mod-border, rgba(0,229,195,0.2));
      color: var(--mod, var(--cyan));
      flex-shrink: 0;
    }

    .section__icon svg { width: 20px; height: 20px; }

    .section__title {
      margin: 0;
      font-size: 1.35rem;
      font-weight: 600;
      letter-spacing: 0.08em;
      color: var(--text);
    }

    /* ── 卡片 ── */
    .cards {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      align-items: flex-start;
      gap: 1rem 1.1rem;
      width: 100%;
      margin: 0 auto;
    }

    .card {
      --mod: var(--cyan);
      position: relative;
      display: flex;
      flex-direction: column;
      flex: 0 0 var(--card-max);
      width: var(--card-max);
      max-width: 100%;
      padding: 1.2rem 1.3rem;
      border-radius: var(--radius);
      background: linear-gradient(145deg, rgba(16, 34, 58, 0.75) 0%, rgba(10, 22, 40, 0.55) 100%);
      border: 1px solid var(--line);
      text-decoration: none;
      color: inherit;
      overflow: hidden;
      backdrop-filter: blur(16px) saturate(1.2);
      transition: transform 0.4s var(--ease), border-color 0.35s, box-shadow 0.4s;
    }

    .card::before {
      content: "";
      position: absolute;
      inset: 0;
      border-radius: inherit;
      padding: 1px;
      background: linear-gradient(135deg, transparent 40%, var(--mod) 100%);
      -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
      mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
      -webkit-mask-composite: xor;
      mask-composite: exclude;
      opacity: 0;
      transition: opacity 0.4s;
    }

    .card::after {
      content: "";
      position: absolute;
      top: 0; left: 0;
      width: 3px; height: 100%;
      background: linear-gradient(180deg, var(--mod), transparent);
      opacity: 0.6;
      transition: opacity 0.3s, width 0.3s;
    }

    .card:hover {
      transform: translateY(-4px);
      border-color: color-mix(in srgb, var(--mod) 40%, transparent);
      box-shadow: var(--glow), 0 20px 50px rgba(0,0,0,0.3);
    }

    .card:hover::before { opacity: 1; }
    .card:hover::after { opacity: 1; width: 4px; }

    .card__row {
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 0.85rem;
      position: relative;
      z-index: 1;
    }

    .card__tag {
      font-family: var(--font-tech);
      font-size: 0.6rem;
      font-weight: 500;
      letter-spacing: 0.12em;
      color: var(--mod);
      padding: 0.25rem 0.6rem;
      border-radius: 4px;
      background: color-mix(in srgb, var(--mod) 10%, transparent);
      border: 1px solid color-mix(in srgb, var(--mod) 20%, transparent);
    }

    .card__idx {
      font-family: var(--font-tech);
      font-size: 0.65rem;
      color: var(--text-muted);
      letter-spacing: 0.08em;
    }

    .card__title {
      font-size: 1rem;
      font-weight: 500;
      line-height: 1.55;
      letter-spacing: 0.03em;
      position: relative;
      z-index: 1;
    }

    .card__desc {
      margin-top: 0.5rem;
      font-size: 0.78rem;
      font-weight: 300;
      color: var(--text-dim);
      line-height: 1.7;
      position: relative;
      z-index: 1;
    }

    /* ── 模块主题 ── */
    .mod-region  { --mod: #34d399; --mod-bg: rgba(52,211,153,0.1); --mod-border: rgba(52,211,153,0.25); }
    .mod-astro   { --mod: #a78bfa; --mod-bg: rgba(167,139,250,0.1); --mod-border: rgba(167,139,250,0.25); }
    .mod-atmos   { --mod: #38bdf8; --mod-bg: rgba(56,189,248,0.1); --mod-border: rgba(56,189,248,0.25); }
    .mod-terrain { --mod: #fb923c; --mod-bg: rgba(251,146,60,0.1); --mod-border: rgba(251,146,60,0.25); }
    .mod-hydro   { --mod: #22d3ee; --mod-bg: rgba(34,211,238,0.1); --mod-border: rgba(34,211,238,0.25); }
    .mod-soil    { --mod: #d4a054; --mod-bg: rgba(212,160,84,0.1); --mod-border: rgba(212,160,84,0.25); }

    /* ── 移动端 ── */
    .mob-nav {
      display: none;
      position: fixed;
      top: var(--header-h);
      left: 0; right: 0;
      z-index: 99;
      padding: 0.6rem 1rem;
      gap: 0.35rem;
      overflow-x: auto;
      background: rgba(6,13,24,0.9);
      backdrop-filter: blur(16px);
      border-bottom: 1px solid var(--line);
      scrollbar-width: none;
    }
    .mob-nav::-webkit-scrollbar { display: none; }

    .mob-nav a {
      flex-shrink: 0;
      padding: 0.35rem 0.75rem;
      border-radius: 6px;
      font-size: 0.72rem;
      letter-spacing: 0.04em;
      color: var(--text-dim);
      text-decoration: none;
      border: 1px solid var(--line);
      transition: all 0.25s;
    }

    .mob-nav a.active {
      color: var(--cyan);
      border-color: rgba(0,229,195,0.3);
      background: var(--cyan-dim);
    }

    @media (max-width: 1100px) {
      .header__actions .header__copyright,
      .header__actions .header__music-toggle {
        font-size: 0.65rem;
        padding: 0.4rem 0.65rem;
      }
    }

    @media (max-width: 900px) {
      :root {
        --section-gap: 2.75rem;
      }

      .header__nav { display: none; }
      .mob-nav { display: flex; }

      .section {
        scroll-margin-top: calc(var(--header-h) + 2.75rem);
      }

      .content { padding: 0 1.25rem 3rem; }
      .hero { padding: calc(var(--header-h) + 1rem) 1.25rem 1.5rem; }

      .cards {
        max-width: 400px;
        margin: 0 auto;
      }

      .card {
        flex: 1 1 100%;
        width: 100%;
      }
    }