:root {
      --sky-void: #02040a;
      --sky-deep: #050914;
      --sky-mid: #0c1630;
      --sky-accent: #0f2848;

      --panel-bg: rgba(10, 18, 40, 0.52);
      --panel-inner: rgba(140, 200, 255, 0.04);
      --panel-edge: rgba(100, 200, 255, 0.22);
      --panel-edge-strong: rgba(129, 230, 255, 0.45);
      --panel-shadow:
        0 4px 4px rgba(0, 0, 0, 0.12),
        0 28px 64px rgba(2, 6, 20, 0.65),
        inset 0 1px 0 rgba(255, 255, 255, 0.07),
        inset 0 0 0 1px rgba(255, 255, 255, 0.02);

      --text: #e8f2ff;
      --text-dim: rgba(220, 235, 255, 0.72);
      --muted: rgba(180, 210, 240, 0.62);

      --sun-core: #fff6e0;
      --sun-edge: #ffc24a;
      --earth-oc: #2a8fd4;
      --earth-land: #3d9d5f;
      --moon-lit: #d8d2c8;
      --moon-shadow: #1a1620;

      --accent: #7dd7ff;
      --accent-strong: #4ecbff;
      --accent-soft: rgba(125, 215, 255, 0.14);
      --accent-warm: #ffd089;
      --accent-warm-strong: #ffbe5c;

      --cyan-glow: rgba(80, 220, 255, 0.35);
      --ring-canvas: rgba(100, 190, 255, 0.28);

      --radius-xl: 20px;
      --radius-lg: 14px;
      --radius-md: 10px;
      --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
    }

    * { box-sizing: border-box; }

    html {
      scroll-behavior: smooth;
      color-scheme: dark;
    }

    body {
      margin: 0;
      min-height: 100vh;
      font-family: "Noto Sans SC", "Noto Serif SC", "PingFang SC", "Microsoft YaHei", sans-serif;
      font-size: 15px;
      font-weight: 400;
      color: var(--text);
      overflow-x: hidden;
      letter-spacing: 0.015em;
      background:
        radial-gradient(ellipse 140% 100% at 50% -30%, rgba(30, 80, 140, 0.45) 0%, transparent 52%),
        radial-gradient(ellipse 90% 70% at 100% 0%, rgba(50, 30, 100, 0.18) 0%, transparent 45%),
        radial-gradient(ellipse 80% 60% at 0% 100%, rgba(0, 100, 120, 0.12) 0%, transparent 50%),
        linear-gradient(180deg, var(--sky-mid) 0%, var(--sky-deep) 38%, var(--sky-void) 100%);
    }

    body::before {
      content: "";
      position: fixed;
      inset: 0;
      pointer-events: none;
      z-index: 0;
      opacity: 0.45;
      background-image:
        linear-gradient(rgba(120, 200, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(120, 200, 255, 0.03) 1px, transparent 1px);
      background-size: 48px 48px;
      mask-image: radial-gradient(ellipse 85% 70% at 50% 35%, black 18%, transparent 72%);
      -webkit-mask-image: radial-gradient(ellipse 85% 70% at 50% 35%, black 18%, transparent 72%);
    }

    body::after {
      content: "";
      position: fixed;
      inset: 0;
      pointer-events: none;
      z-index: 6;
      opacity: 0.04;
      background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
    }

    .stars {
      position: fixed;
      inset: 0;
      pointer-events: none;
      background-image:
        radial-gradient(1.5px 1.5px at 8% 22%, rgba(255,255,255,0.65) 0%, transparent 100%),
        radial-gradient(1px 1px at 71% 48%, rgba(255,255,255,0.4) 0%, transparent 100%),
        radial-gradient(2px 2px at 32% 79%, rgba(200,235,255,0.5) 0%, transparent 100%),
        radial-gradient(1px 1px at 91% 11%, rgba(255,255,255,0.35) 0%, transparent 100%),
        radial-gradient(1.5px 1.5px at 48% 8%, rgba(255,240,220,0.55) 0%, transparent 100%),
        radial-gradient(1px 1px at 52% 91%, rgba(255,255,255,0.38) 0%, transparent 100%),
        radial-gradient(1px 1px at 62% 32%, rgba(255,255,255,0.25) 0%, transparent 100%);
      opacity: 0.9;
      z-index: 1;
      animation: sky-twinkle 10s ease-in-out infinite alternate;
    }

    @keyframes sky-twinkle {
      from { opacity: 0.78; transform: translateY(0); }
      to { opacity: 0.95; transform: translateY(-4px); }
    }

    @keyframes header-shimmer {
      0%, 100% { opacity: 0.55; }
      50% { opacity: 0.92; }
    }

    .wrap {
      position: relative;
      z-index: 5;
      max-width: 1180px;
      margin: 0 auto;
      padding: 0.85rem 1.35rem 2.6rem;
    }

    .wrap::before {
      content: "";
      position: absolute;
      width: clamp(260px, 42vw, 420px);
      height: clamp(260px, 42vw, 420px);
      left: 50%;
      top: -6rem;
      transform: translateX(-50%);
      background: radial-gradient(circle at 40% 40%, rgba(100, 220, 255, 0.12) 0%, transparent 55%);
      pointer-events: none;
      filter: blur(4px);
    }

    .site-header {
      text-align: center;
      margin-bottom: 1rem;
      position: relative;
    }

    .site-header h1 {
      font-family: "Ma Shan Zheng", "Noto Serif SC", serif;
      font-weight: 400;
      font-size: clamp(2rem, 5.2vw, 2.95rem);
      letter-spacing: 0.08em;
      margin: 0;
      line-height: 1.15;
      background: linear-gradient(125deg, #fff 12%, var(--accent) 42%, var(--accent-strong) 78%, #b8f0ff 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      filter: drop-shadow(0 2px 16px rgba(60, 180, 255, 0.22));
    }

    .header-rule {
      width: min(280px, 46vw);
      height: 2px;
      margin: 0.75rem auto 0;
      border-radius: 2px;
      background: linear-gradient(
        90deg,
        transparent,
        rgba(100, 200, 255, 0.15) 12%,
        rgba(129, 240, 255, 0.65) 50%,
        rgba(100, 200, 255, 0.15) 88%,
        transparent
      );
      box-shadow: 0 0 20px var(--cyan-glow);
      animation: header-shimmer 5s ease-in-out infinite;
    }

    header p {
      margin: 0;
      font-size: 0.95rem;
      color: var(--muted);
      max-width: 36em;
      margin-inline: auto;
      line-height: 1.65;
    }

    .layout {
      display: grid;
      grid-template-columns: 1fr minmax(288px, 348px);
      gap: 1.35rem;
      align-items: stretch;
    }
    @media (max-width: 920px) {
      .layout { grid-template-columns: 1fr; }
    }

    .layout > .panel:first-child {
      display: flex;
      flex-direction: column;
    }

    .panel {
      position: relative;
      background:
        linear-gradient(165deg, var(--panel-inner) 0%, transparent 42%),
        var(--panel-bg);
      border: 1px solid rgba(140, 200, 255, 0.14);
      border-radius: var(--radius-xl);
      padding: 1.2rem 1.25rem 1.15rem;
      backdrop-filter: blur(18px) saturate(1.35);
      -webkit-backdrop-filter: blur(18px) saturate(1.35);
      box-shadow: var(--panel-shadow);
      transition: border-color 0.35s var(--ease-out-expo), box-shadow 0.35s var(--ease-out-expo);
    }

    .panel::before {
      content: "";
      position: absolute;
      inset: 0;
      border-radius: inherit;
      padding: 1px;
      background: linear-gradient(
        155deg,
        rgba(200, 240, 255, 0.28) 0%,
        rgba(100, 160, 220, 0.06) 35%,
        transparent 55%,
        rgba(80, 140, 200, 0.05) 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;
      pointer-events: none;
    }

    .panel:hover {
      border-color: rgba(150, 220, 255, 0.22);
      box-shadow:
        var(--panel-shadow),
        0 0 0 1px rgba(100, 200, 255, 0.06),
        0 0 48px rgba(40, 120, 200, 0.08);
    }

    .panel h2 {
      margin: 0 0 0.85rem;
      padding-bottom: 0.55rem;
      font-family: "Outfit", "Noto Sans SC", sans-serif;
      font-size: 0.82rem;
      font-weight: 650;
      letter-spacing: 0.14em;
      text-transform: uppercase;
      color: var(--accent);
      border-bottom: 1px solid rgba(100, 180, 255, 0.12);
      text-shadow: 0 0 28px rgba(80, 200, 255, 0.15);
    }

    .panel h2.panel-title-center {
      text-align: center;
      border-bottom: none;
      padding-bottom: 0;
    }

    .canvas-frame {
      position: relative;
      border-radius: var(--radius-lg);
      padding: 1px;
      background: linear-gradient(
        145deg,
        rgba(160, 220, 255, 0.35) 0%,
        rgba(80, 120, 180, 0.12) 45%,
        rgba(40, 80, 140, 0.2) 100%
      );
      box-shadow:
        0 0 0 1px rgba(0, 0, 0, 0.35),
        0 12px 40px rgba(0, 8, 24, 0.55),
        inset 0 1px 0 rgba(255, 255, 255, 0.06);
    }

    .canvas-frame::after {
      content: "";
      position: absolute;
      inset: -2px;
      border-radius: calc(var(--radius-lg) + 2px);
      pointer-events: none;
      box-shadow: 0 0 32px rgba(80, 190, 255, 0.08);
    }

    canvas#orbitCanvas {
      display: block;
      width: 100%;
      height: auto;
      aspect-ratio: 16/10;
      border-radius: calc(var(--radius-lg) - 1px);
      background: radial-gradient(circle at 50% 48%, #141e3a 0%, #050810 88%);
      cursor: grab;
      touch-action: none;
    }
    canvas#orbitCanvas:active { cursor: grabbing; }

    .moon-stage.panel > h2 {
      margin-bottom: 0.5rem;
    }
    .moon-stage.panel {
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 0.62rem;
    }
    .moon-stage .principle {
      margin-top: 0.42rem;
    }
    .moon-stage .observer-note {
      margin-top: 0.42rem;
      padding: 0.55rem 0.72rem;
    }

    .moon-stage details.explain {
      width: 100%;
      align-self: stretch;
      box-sizing: border-box;
      margin-top: 0.5rem;
      padding-top: 0.55rem;
    }
    .moon-stage details.explain p {
      margin-top: 0.45rem;
    }

    canvas#moonCanvas {
      width: min(260px, 76vw);
      height: min(260px, 76vw);
      filter: drop-shadow(0 0 28px rgba(200, 210, 255, 0.15));
    }

    .phase-name {
      font-size: 1.35rem;
      font-weight: 700;
      color: var(--accent-warm);
      text-align: center;
    }
    .phase-en {
      font-size: 0.75rem;
      color: var(--muted);
      text-align: center;
      letter-spacing: 0.03em;
    }

    .controls {
      margin-top: 0.95rem;
      flex: 1 1 auto;
    }
    .slider-row {
      display: grid;
      grid-template-columns: auto 1fr auto;
      gap: 0.65rem;
      align-items: center;
      margin-bottom: 0.65rem;
    }
    .slider-row label {
      font-size: 0.78rem;
      font-weight: 500;
      color: var(--text-dim);
      white-space: nowrap;
    }

    .slider-row.play-speed-row {
      grid-template-columns: auto auto 1fr auto;
      gap: 0.5rem 0.6rem;
      align-items: center;
    }

    .slider-row.play-speed-row label {
      white-space: normal;
      max-width: 7rem;
      line-height: 1.35;
    }

    .slider-row.play-speed-row .icon-btn.btn-play-toggle {
      margin: 0;
    }

    input[type="range"] {
      -webkit-appearance: none;
      appearance: none;
      width: 100%;
      height: 8px;
      border-radius: 8px;
      background: linear-gradient(90deg, rgba(30, 50, 90, 0.9) 0%, rgba(20, 35, 70, 0.95) 100%);
      border: 1px solid rgba(120, 190, 255, 0.15);
      box-shadow: inset 0 2px 6px rgba(0, 0, 0, 0.35);
    }

    input[type="range"]::-webkit-slider-thumb {
      -webkit-appearance: none;
      appearance: none;
      width: 18px;
      height: 18px;
      border-radius: 50%;
      background: radial-gradient(circle at 35% 30%, #fff 0%, var(--accent-strong) 45%, #1a5080 100%);
      border: 1px solid rgba(200, 240, 255, 0.55);
      box-shadow:
        0 0 0 2px rgba(10, 20, 40, 0.6),
        0 2px 10px rgba(80, 200, 255, 0.35);
      cursor: pointer;
      transition: transform 0.15s var(--ease-out-expo), box-shadow 0.15s;
    }

    input[type="range"]::-webkit-slider-thumb:hover {
      transform: scale(1.08);
      box-shadow:
        0 0 0 2px rgba(10, 20, 40, 0.6),
        0 0 20px rgba(100, 220, 255, 0.45);
    }

    input[type="range"]::-moz-range-thumb {
      width: 18px;
      height: 18px;
      border-radius: 50%;
      background: radial-gradient(circle at 35% 30%, #fff 0%, var(--accent-strong) 45%, #1a5080 100%);
      border: 1px solid rgba(200, 240, 255, 0.55);
      box-shadow:
        0 0 0 2px rgba(10, 20, 40, 0.6),
        0 2px 10px rgba(80, 200, 255, 0.35);
      cursor: pointer;
    }

    input[type="range"]:focus-visible {
      outline: 2px solid var(--accent-strong);
      outline-offset: 3px;
    }

    .angle-readout {
      font-family: "Outfit", "Noto Sans SC", sans-serif;
      font-variant-numeric: tabular-nums;
      font-size: 0.8rem;
      font-weight: 600;
      color: var(--accent);
      min-width: 4rem;
      text-align: right;
      text-shadow: 0 0 16px rgba(100, 200, 255, 0.2);
    }

    .btn-row {
      display: flex;
      flex-wrap: wrap;
      gap: 0.5rem;
      margin-bottom: 0.6rem;
    }

    button {
      font-family: "Outfit", "Noto Sans SC", sans-serif;
      font-size: 0.8rem;
      font-weight: 550;
      letter-spacing: 0.04em;
      padding: 0.48rem 0.88rem;
      border-radius: var(--radius-md);
      border: 1px solid rgba(130, 200, 255, 0.28);
      background: linear-gradient(180deg, rgba(35, 55, 100, 0.75) 0%, rgba(18, 32, 62, 0.85) 100%);
      color: var(--text);
      cursor: pointer;
      box-shadow:
        0 2px 8px rgba(0, 4, 16, 0.4),
        inset 0 1px 0 rgba(255, 255, 255, 0.08);
      transition:
        transform 0.2s var(--ease-out-expo),
        border-color 0.2s,
        background 0.2s,
        box-shadow 0.2s;
    }

    button:hover {
      border-color: rgba(160, 220, 255, 0.55);
      background: linear-gradient(180deg, rgba(48, 75, 130, 0.88) 0%, rgba(22, 40, 78, 0.92) 100%);
      box-shadow:
        0 4px 16px rgba(40, 100, 180, 0.2),
        inset 0 1px 0 rgba(255, 255, 255, 0.12);
      transform: translateY(-1px);
    }

    button:active {
      transform: translateY(0);
    }

    button:focus-visible {
      outline: 2px solid var(--accent-strong);
      outline-offset: 2px;
    }

    button.primary {
      background: linear-gradient(145deg, rgba(50, 120, 200, 0.55) 0%, rgba(25, 50, 100, 0.9) 100%);
      border-color: rgba(160, 220, 255, 0.5);
      box-shadow:
        0 0 20px rgba(80, 180, 255, 0.15),
        inset 0 1px 0 rgba(255, 255, 255, 0.12);
    }

    /** 播放 / 暂停图标（#btnPlay） */
    button.icon-btn.btn-play-toggle {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 2.65rem;
      min-height: 2.42rem;
      padding: 0.45rem;
      line-height: 0;
    }
    button.icon-btn.btn-play-toggle .btn-play-icon {
      display: block;
      flex-shrink: 0;
    }
    button.icon-btn.btn-play-toggle.playing .play-glyph {
      display: none;
    }
    button.icon-btn.btn-play-toggle.playing .pause-glyph {
      display: block;
    }
    button.icon-btn.btn-play-toggle:not(.playing) .pause-glyph {
      display: none;
    }
    button.icon-btn.btn-play-toggle:not(.playing) .play-glyph {
      display: block;
    }

    button.small { padding: 0.38rem 0.58rem; font-size: 0.76rem; }

    .chips {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 0.4rem;
    }
    @media (max-width: 400px) {
      .chips { grid-template-columns: repeat(2, 1fr); }
    }
    .chip {
      padding: 0.4rem 0.48rem;
      font-family: "Outfit", "Noto Sans SC", sans-serif;
      font-size: 0.72rem;
      font-weight: 500;
      border-radius: var(--radius-md);
      border: 1px solid rgba(120, 180, 255, 0.14);
      background: rgba(8, 16, 36, 0.55);
      text-align: center;
      cursor: pointer;
      color: var(--muted);
      transition:
        color 0.2s,
        border-color 0.2s,
        background 0.2s,
        box-shadow 0.2s,
        transform 0.15s var(--ease-out-expo);
    }
    .chip:hover {
      color: var(--text);
      border-color: rgba(150, 210, 255, 0.35);
      background: rgba(22, 40, 78, 0.65);
      transform: translateY(-1px);
    }
    .chip.on {
      color: var(--text);
      border-color: var(--accent-strong);
      background: linear-gradient(160deg, rgba(60, 140, 220, 0.25) 0%, rgba(15, 30, 60, 0.75) 100%);
      box-shadow:
        0 0 16px rgba(80, 180, 255, 0.12),
        inset 0 1px 0 rgba(255, 255, 255, 0.06);
    }

    .principle {
      margin-top: 0.95rem;
      font-size: 0.84rem;
      line-height: 1.68;
      color: var(--muted);
    }
    .principle strong {
      color: var(--accent-warm-strong);
      font-weight: 600;
    }

    .observer-note {
      margin-top: 0.75rem;
      font-size: 0.81rem;
      line-height: 1.7;
      color: rgba(220, 232, 250, 0.82);
      text-align: left;
      align-self: stretch;
      padding: 0.65rem 0.78rem;
      border-radius: var(--radius-md);
      border: 1px solid rgba(120, 190, 255, 0.18);
      background: linear-gradient(135deg, rgba(20, 40, 80, 0.35) 0%, rgba(10, 18, 36, 0.5) 100%);
      box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.05);
    }
    .observer-note strong:first-of-type {
      color: var(--accent);
      font-weight: 600;
    }

    details.explain {
      margin-top: 1rem;
      border-top: 1px solid rgba(100, 170, 255, 0.12);
      padding-top: 0.88rem;
    }
    details.explain summary {
      cursor: pointer;
      list-style: none;
      position: relative;
      padding-right: 1.35rem;
      color: var(--accent);
      font-size: 0.86rem;
      font-weight: 600;
      transition: color 0.2s;
    }

    details.explain summary::-webkit-details-marker { display: none; }

    details.explain summary::after {
      content: "";
      position: absolute;
      right: 0;
      top: 50%;
      width: 0.45rem;
      height: 0.45rem;
      border-right: 2px solid rgba(150, 210, 255, 0.55);
      border-bottom: 2px solid rgba(150, 210, 255, 0.55);
      transform: translateY(-60%) rotate(45deg);
      transition: transform 0.25s var(--ease-out-expo);
    }

    details.explain[open] summary::after {
      transform: translateY(-20%) rotate(225deg);
    }

    details.explain summary:hover {
      color: var(--accent-strong);
    }

    details.explain summary:focus-visible {
      outline: 2px solid var(--accent-strong);
      outline-offset: 3px;
      border-radius: 4px;
    }

    details.explain p {
      margin: 0.62rem 0 0;
      font-size: 0.82rem;
      line-height: 1.7;
      color: var(--muted);
    }

    details.explain-mnemonic {
      margin-top: 0.75rem;
      border-top: 1px solid rgba(255, 200, 140, 0.15);
      padding-top: 0.82rem;
    }
    details.explain-mnemonic summary {
      color: var(--accent-warm);
      padding-left: 1.35rem;
      padding-right: 0;
    }
    details.explain-mnemonic summary::after {
      left: 0.15rem;
      right: auto;
      border-right-color: rgba(255, 200, 150, 0.5);
      border-bottom-color: rgba(255, 200, 150, 0.5);
    }
    details.explain-mnemonic .mnemonic-line {
      display: block;
      margin: 0 0 0.4rem;
      font-weight: 700;
      font-size: 0.9rem;
      letter-spacing: 0.04em;
      color: rgba(255, 230, 195, 0.95);
    }
    details.explain-mnemonic p:first-of-type {
      margin-top: 0;
    }
    details.explain-mnemonic .mnemonic-tip {
      margin-top: 0.75rem;
      font-size: 0.8rem;
      line-height: 1.65;
      color: rgba(232, 238, 248, 0.45);
    }
    .controls > details.explain.explain-mnemonic {
      width: 100%;
      max-width: 100%;
    }

    .eclipse-explain-dialog {
      border: none;
      padding: 0;
      max-width: min(940px, calc(100vw - 2rem));
      width: min(940px, 94vw);
      border-radius: var(--radius-xl);
      background: linear-gradient(180deg, rgba(16, 24, 48, 0.98) 0%, rgba(8, 12, 28, 0.99) 100%);
      color: var(--text);
      box-shadow:
        0 32px 80px rgba(0, 4, 20, 0.75),
        0 0 0 1px rgba(120, 200, 255, 0.12);
      backdrop-filter: blur(24px);
    }
    .eclipse-explain-dialog::backdrop {
      background: radial-gradient(circle at 50% 50%, rgba(4, 12, 32, 0.88) 0%, rgba(0, 4, 12, 0.92) 100%);
      backdrop-filter: blur(6px);
    }
    .eclipse-explain-card {
      overflow: hidden;
      border-radius: var(--radius-xl);
      border: 1px solid rgba(120, 180, 255, 0.2);
    }
    .eclipse-explain-head {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 0.75rem;
      padding: 0.65rem 1rem;
      border-bottom: 1px solid rgba(120, 160, 220, 0.15);
      background: linear-gradient(90deg, rgba(20, 35, 70, 0.6) 0%, rgba(12, 20, 44, 0.5) 100%);
    }
    .eclipse-explain-title {
      margin: 0;
      font-family: "Outfit", "Noto Sans SC", sans-serif;
      font-size: 0.88rem;
      font-weight: 650;
      letter-spacing: 0.12em;
      text-transform: uppercase;
      color: var(--accent);
    }
    .eclipse-explain-close {
      flex-shrink: 0;
      width: 36px;
      height: 36px;
      border-radius: var(--radius-md);
      border: 1px solid rgba(158, 200, 255, 0.3);
      background: rgba(18, 28, 52, 0.85);
      color: rgba(228, 234, 245, 0.85);
      font-size: 1.35rem;
      line-height: 1;
      cursor: pointer;
      transition:
        border-color 0.2s,
        background 0.2s,
        box-shadow 0.2s;
    }
    .eclipse-explain-close:hover,
    .eclipse-explain-close:focus-visible {
      border-color: var(--accent-strong);
      background: rgba(35, 55, 95, 0.9);
      box-shadow: 0 0 20px rgba(80, 180, 255, 0.15);
      outline: none;
    }
    .eclipse-explain-body {
      line-height: 0;
      text-align: center;
      background: #050810;
    }
    .eclipse-explain-img {
      display: block;
      width: 100%;
      height: auto;
      max-height: min(82vh, 880px);
      object-fit: contain;
    }

    /** 月亮古诗词弹窗：加宽 + 分层月夜背景 */
    .moon-poems-dialog.eclipse-explain-dialog {
      max-width: min(680px, calc(100vw - 2rem));
      width: min(680px, 96vw);
      padding: 0;
      border: none;
      background: transparent;
      box-shadow: none;
      backdrop-filter: none;
      color: var(--text);
    }

    .moon-poems-dialog::backdrop {
      background:
        radial-gradient(ellipse 85% 70% at 50% 40%, rgba(8, 18, 42, 0.75) 0%, rgba(2, 6, 18, 0.88) 55%, rgba(0, 2, 10, 0.92) 100%);
      backdrop-filter: blur(10px);
      -webkit-backdrop-filter: blur(10px);
    }

    .moon-poems-card.eclipse-explain-card {
      border-radius: var(--radius-xl);
      overflow: hidden;
      border: 1px solid rgba(160, 200, 255, 0.14);
      background:
        linear-gradient(180deg, rgba(255, 255, 255, 0.04) 0%, transparent 12%),
        radial-gradient(ellipse 95% 80% at 50% -12%, rgba(130, 175, 230, 0.18) 0%, transparent 52%),
        linear-gradient(168deg, #141c30 0%, #0e1526 42%, #0a101c 72%, #060a12 100%);
      box-shadow:
        0 28px 100px rgba(0, 4, 24, 0.78),
        0 0 0 1px rgba(255, 250, 240, 0.05) inset,
        0 -20px 60px rgba(80, 120, 200, 0.06) inset,
        0 0 100px rgba(100, 160, 255, 0.05);
    }

    .moon-poems-head.eclipse-explain-head {
      position: relative;
      justify-content: center;
      align-items: center;
      flex-wrap: nowrap;
      padding: 1rem 0.95rem;
      border-bottom: none;
      background:
        linear-gradient(180deg, rgba(55, 85, 130, 0.22) 0%, transparent 100%),
        linear-gradient(90deg, rgba(255, 245, 230, 0.04) 0%, transparent 38%, transparent 62%, rgba(120, 170, 220, 0.06) 100%);
      border-bottom: 1px solid rgba(160, 195, 230, 0.1);
    }

    .moon-poems-head.eclipse-explain-head .eclipse-explain-close {
      position: absolute;
      right: 0.72rem;
      top: 50%;
      transform: translateY(-50%);
      flex-shrink: 0;
    }

    .moon-poems-head-text {
      width: 100%;
      box-sizing: border-box;
      padding: 0.12rem 2.85rem 0;
      text-align: center;
    }

    .moon-poems-main-title {
      margin: 0;
      font-family: "Ma Shan Zheng", "Noto Serif SC", serif;
      font-weight: 400;
      font-size: clamp(1.22rem, 3.6vw, 1.48rem);
      letter-spacing: 0.14em;
      line-height: 1.35;
      color: #faf8f3;
      text-shadow: 0 1px 0 rgba(0, 0, 0, 0.35), 0 0 40px rgba(180, 210, 255, 0.12);
    }

    .moon-poems-subtitle {
      margin: 0.35rem 0 0;
      font-family: "Noto Serif SC", "Noto Sans SC", serif;
      font-size: 0.72rem;
      letter-spacing: 0.42em;
      color: rgba(200, 218, 240, 0.48);
    }

    .moon-poems-body {
      position: relative;
      max-height: min(72vh, 560px);
      overflow-y: auto;
      overflow-x: hidden;
      padding: 1.65rem 1rem 1.85rem;
      border-top: 1px solid rgba(255, 255, 255, 0.04);
      background:
        radial-gradient(ellipse 100% 55% at 50% 0%, rgba(255, 252, 245, 0.11) 0%, transparent 52%),
        radial-gradient(ellipse 55% 45% at 12% 55%, rgba(90, 130, 200, 0.1) 0%, transparent 48%),
        radial-gradient(ellipse 50% 40% at 88% 35%, rgba(120, 170, 220, 0.08) 0%, transparent 48%),
        linear-gradient(180deg, hsl(222 40% 12%) 0%, hsl(226 36% 9%) 38%, hsl(230 32% 7%) 72%, hsl(232 28% 5.5%) 100%);
    }

    .moon-poems-body::before {
      content: "";
      position: absolute;
      inset: 0;
      pointer-events: none;
      z-index: 0;
      opacity: 0.35;
      background-image:
        radial-gradient(1px 1px at 10% 25%, rgba(255, 255, 255, 0.22) 0%, transparent 100%),
        radial-gradient(1px 1px at 35% 70%, rgba(255, 255, 255, 0.15) 0%, transparent 100%),
        radial-gradient(1.5px 1.5px at 78% 18%, rgba(220, 235, 255, 0.2) 0%, transparent 100%),
        radial-gradient(1px 1px at 92% 55%, rgba(255, 255, 255, 0.12) 0%, transparent 100%),
        radial-gradient(1px 1px at 55% 88%, rgba(255, 255, 255, 0.14) 0%, transparent 100%);
    }

    .moon-poems-glow {
      position: absolute;
      left: 50%;
      top: 0.2rem;
      width: clamp(7rem, 38vw, 11rem);
      height: clamp(7rem, 38vw, 11rem);
      transform: translateX(-50%);
      border-radius: 50%;
      z-index: 0;
      background: radial-gradient(
        circle at 38% 32%,
        rgba(255, 255, 252, 0.45) 0%,
        rgba(255, 244, 220, 0.14) 28%,
        rgba(160, 200, 255, 0.06) 50%,
        transparent 68%
      );
      opacity: 0.52;
      filter: blur(10px);
      pointer-events: none;
    }

    .moon-poems-list {
      position: relative;
      z-index: 1;
      margin: 0;
      padding: 0.6rem 1rem 0;
      list-style: none;
      counter-reset: moon-poem;
    }

    .moon-poem-item {
      position: relative;
      counter-increment: moon-poem;
      margin: 0 0 0.15rem;
      padding: 1.15rem 0.75rem 1.25rem 2.35rem;
      border-bottom: 1px solid rgba(160, 195, 230, 0.06);
      background: linear-gradient(
        90deg,
        rgba(255, 255, 255, 0.02) 0%,
        transparent 35%,
        transparent 65%,
        rgba(255, 255, 255, 0.018) 100%
      );
    }

    .moon-poem-item:last-child {
      border-bottom: none;
      padding-bottom: 0.25rem;
    }

    .moon-poem-item::before {
      content: counter(moon-poem);
      position: absolute;
      left: 0.45rem;
      top: 1.35rem;
      width: 1.35rem;
      text-align: center;
      font-family: "Outfit", "Noto Sans SC", sans-serif;
      font-size: 0.68rem;
      font-weight: 600;
      letter-spacing: 0;
      color: rgba(200, 220, 248, 0.3);
    }

    .moon-poem-item::after {
      content: "";
      position: absolute;
      left: 1.1rem;
      top: 0.85rem;
      bottom: 0.85rem;
      width: 1px;
      background: linear-gradient(
        180deg,
        transparent,
        rgba(255, 230, 200, 0.12) 16%,
        rgba(170, 200, 235, 0.18) 50%,
        rgba(255, 230, 200, 0.1) 84%,
        transparent
      );
      pointer-events: none;
    }

    .moon-poem-meta {
      display: flex;
      flex-wrap: wrap;
      align-items: baseline;
      justify-content: center;
      gap: 0.35rem 0.45rem;
      margin: 0 0 0.72rem;
      text-align: center;
    }

    .moon-poem-work {
      font-family: "Noto Serif SC", "Songti SC", serif;
      font-size: 0.92rem;
      font-weight: 600;
      letter-spacing: 0.2em;
      color: rgba(255, 236, 210, 0.95);
    }

    .moon-poem-work::before {
      content: "《";
      font-weight: 400;
      letter-spacing: 0;
      opacity: 0.88;
    }

    .moon-poem-work::after {
      content: "》";
      font-weight: 400;
      letter-spacing: 0;
      opacity: 0.88;
    }

    .moon-poem-note {
      font-family: "Noto Serif SC", serif;
      font-size: 0.72rem;
      font-weight: 400;
      letter-spacing: 0.06em;
      color: rgba(200, 210, 225, 0.45);
    }

    .moon-poem-sep {
      color: rgba(255, 210, 160, 0.35);
      font-size: 0.85rem;
      margin: 0 0.1rem;
    }

    .moon-poem-author {
      font-family: "Noto Serif SC", serif;
      font-size: 0.78rem;
      font-weight: 500;
      letter-spacing: 0.28em;
      color: rgba(190, 210, 232, 0.65);
    }

    .moon-poem-text {
      margin: 0 auto;
      max-width: min(28em, 92%);
      text-align: center;
      font-family: "Noto Serif SC", "Songti SC", serif;
      font-size: 0.93rem;
      line-height: 2.05;
      letter-spacing: 0.06em;
      color: rgba(242, 246, 252, 0.9);
    }

    .moon-poems-body::-webkit-scrollbar {
      width: 7px;
    }
    .moon-poems-body::-webkit-scrollbar-track {
      background: rgba(255, 255, 255, 0.04);
      border-radius: 6px;
    }
    .moon-poems-body::-webkit-scrollbar-thumb {
      background: linear-gradient(180deg, rgba(160, 200, 240, 0.25), rgba(120, 160, 200, 0.2));
      border-radius: 6px;
    }
    .moon-poems-body::-webkit-scrollbar-thumb:hover {
      background: linear-gradient(180deg, rgba(190, 220, 255, 0.35), rgba(140, 180, 220, 0.28));
    }

    /* —— 版权（与「热力环流」控制面板一致）—— */
    .layout > .panel:first-child .copyright-entry {
      margin-top: auto;
      padding-top: 14px;
      margin-bottom: 0;
      border-top: 1px solid rgba(120, 180, 255, 0.14);
    }

    .copyright-text-btn {
      display: block;
      width: 100%;
      padding: 11px 14px;
      font-family: "Outfit", "Noto Sans SC", sans-serif;
      font-size: 12px;
      font-weight: 550;
      letter-spacing: 0.06em;
      color: rgba(180, 210, 255, 0.85);
      background: rgba(8, 16, 36, 0.4);
      border: 1px solid rgba(120, 180, 255, 0.22);
      border-radius: var(--radius-md);
      cursor: pointer;
      text-align: center;
      transition:
        background 0.25s,
        border-color 0.25s,
        color 0.25s,
        box-shadow 0.25s;
    }

    .copyright-text-btn:hover {
      background: rgba(25, 45, 90, 0.55);
      border-color: rgba(160, 210, 255, 0.45);
      color: #e8f4ff;
      box-shadow: 0 0 24px rgba(80, 160, 255, 0.08);
    }

    .copyright-text-btn:focus-visible {
      outline: 2px solid var(--accent-strong);
      outline-offset: 2px;
    }

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

    .copyright-modal .modal-title {
      text-align: center;
    }

    .copyright-modal .modal-actions {
      justify-content: center;
    }

    .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: 12px;
      line-height: 1.35;
      color: rgba(180, 205, 255, 0.85);
    }

    .copyright-qr-image {
      display: block;
      width: 100%;
      max-width: 200px;
      height: auto;
      margin: 0 auto;
      border-radius: var(--radius-md);
      border: 1px solid rgba(100, 150, 220, 0.35);
    }

    .copyright-note {
      margin: 0;
      font-size: 13px;
      line-height: 1.55;
      color: rgba(205, 220, 255, 0.88);
      text-align: center;
    }

    .modal-overlay {
      position: fixed;
      inset: 0;
      z-index: 20000;
      display: flex;
      align-items: center;
      justify-content: center;
      padding: 16px;
      background: rgba(2, 6, 18, 0.72);
      backdrop-filter: blur(8px);
      box-sizing: border-box;
    }

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

    .modal-dialog {
      width: 100%;
      max-width: 380px;
      padding: 22px 20px;
      border-radius: var(--radius-xl);
      background:
        linear-gradient(180deg, rgba(24, 40, 72, 0.45) 0%, transparent 40%),
        linear-gradient(180deg, #0a142c 0%, #050914 100%);
      border: 1px solid rgba(100, 170, 255, 0.22);
      box-shadow:
        0 28px 64px rgba(0, 4, 20, 0.65),
        inset 0 1px 0 rgba(255, 255, 255, 0.06);
      color: #e8f2ff;
    }

    .modal-title {
      margin: 0 0 14px;
      font-family: "Ma Shan Zheng", serif;
      font-size: 1.35rem;
      font-weight: 400;
      letter-spacing: 0.06em;
      color: var(--accent);
    }

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

    .modal-btn {
      padding: 9px 20px;
      font-family: "Outfit", "Noto Sans SC", sans-serif;
      font-size: 13px;
      font-weight: 550;
      border-radius: var(--radius-md);
      cursor: pointer;
      border: 1px solid rgba(120, 180, 255, 0.35);
      background: linear-gradient(180deg, rgba(35, 60, 110, 0.85) 0%, rgba(20, 38, 78, 0.95) 100%);
      color: #eff3ff;
    }

    .modal-btn:hover {
      border-color: var(--accent);
      box-shadow: 0 0 20px rgba(80, 180, 255, 0.12);
    }

    .modal-btn-primary {
      border-color: rgba(150, 210, 255, 0.5);
      background: linear-gradient(145deg, rgba(55, 120, 200, 0.5) 0%, rgba(25, 50, 100, 0.95) 100%);
    }

    .modal-btn:focus-visible {
      outline: 2px solid var(--accent-strong);
      outline-offset: 2px;
    }

    @media (prefers-reduced-motion: reduce) {
      .stars {
        animation: none;
        opacity: 0.85;
        transform: none;
      }
      .header-rule {
        animation: none;
        opacity: 0.78;
      }
      button:hover,
      .chip:hover {
        transform: none;
      }
      input[type="range"]::-webkit-slider-thumb:hover {
        transform: none;
      }
    }