:root {
  --z-base: 1;
  --z-game: 2;
  --z-mobile-controls: 4;
  --z-hud: 5;
  --z-pause: 6;
  --z-loading: 20;
  --z-help-backdrop: 29;
  --z-help-panel: 30;
  --ui-bg: #08131d;
  --ui-panel: rgba(9, 19, 29, 0.88);
  --ui-panel-strong: rgba(13, 28, 42, 0.94);
  --ui-line: rgba(255, 220, 128, 0.28);
  --ui-line-cool: rgba(122, 215, 255, 0.28);
  --ui-text: #fff4df;
  --ui-muted: #b9cad3;
  --ui-gold: #ffce5a;
  --ui-orange: #ff7a2f;
  --ui-blue: #7ad7ff;
  --ui-danger: #ff5f4a;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
  html, body {
    height: 100%;
    min-height: 100vh;
    background: var(--ui-bg);
    color: #eee;
    font-family: 'Microsoft YaHei', 'PingFang SC', 'Hiragino Sans GB', 'Noto Sans CJK SC', Arial, sans-serif;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
  }
  #wrap {
    position: relative;
    width: min(100vw, 177.78vh);
    height: min(56.25vw, 100vh);
    max-width: 100vw;
    max-height: 100vh;
    box-shadow: 0 0 60px rgba(255, 138, 58, 0.3);
    border-radius: 8px;
    overflow: hidden;
    background: #000;
  }
  canvas {
    display: block;
    width: 100%;
    height: 100%;
    background: #000;
    image-rendering: pixelated;
    image-rendering: crisp-edges;
    touch-action: none;
    max-width: 100%;
    max-height: 100vh;
  }
  #hud {
    position: absolute;
    top: 1.5%;
    left: 0;
    right: 0;
    padding: 0 clamp(8px, 1.5vw, 16px);
    display: flex;
    justify-content: space-between;
    font-size: 16px;
    letter-spacing: 0;
    pointer-events: none;
    text-shadow: 0 0 4px #000, 2px 2px 0 #000;
  }
  #hud .life { color: #ff4a4a; }
  #hud .score { color: #ffe24a; }
  #hud .stage { color: #5ad7ff; }
  #life {
    display: inline-flex;
    align-items: center;
    gap: 3px;
    min-width: 44px;
    vertical-align: middle;
  }
  #life .life-heart {
    width: 18px;
    height: 18px;
    image-rendering: auto;
    filter: drop-shadow(0 1px 1px rgba(0, 0, 0, 0.85));
  }

  #overlay {
    position: fixed;
    inset: 0;
    background:
      linear-gradient(90deg, rgba(4, 12, 20, 0.9) 0%, rgba(4, 12, 20, 0.68) 42%, rgba(4, 12, 20, 0.18) 72%),
      linear-gradient(180deg, rgba(4, 12, 20, 0.1) 45%, rgba(4, 12, 20, 0.72) 100%),
      url("../assets/cover.jpg?v=3") center / cover no-repeat;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: left;
    z-index: var(--z-hud);
    padding: clamp(18px, 4vw, 52px);
    user-select: none;
    -webkit-user-select: none;
    overflow-y: auto;
  }
  #overlay::before,
  #overlay::after {
    content: "";
    position: absolute;
    inset: 0;
    pointer-events: none;
  }
  #overlay::before {
    background:
      radial-gradient(circle at 76% 24%, rgba(255, 206, 90, 0.24), transparent 25%),
      radial-gradient(circle at 18% 86%, rgba(122, 215, 255, 0.18), transparent 34%);
    opacity: 0.75;
    mix-blend-mode: screen;
  }
  #overlay::after {
    background: linear-gradient(180deg, transparent 56%, rgba(2, 8, 13, 0.7) 100%);
  }
  #overlay .card {
    position: relative;
    z-index: 1;
    background: linear-gradient(180deg, var(--ui-panel-strong) 0%, var(--ui-panel) 100%);
    border: 1px solid var(--ui-line);
    border-radius: 8px;
    width: 100%;
    max-width: min(96vw, 560px);
    padding: clamp(18px, 3vw, 30px);
    box-shadow:
      0 24px 70px rgba(0, 0, 0, 0.58),
      inset 0 1px 0 rgba(255, 255, 255, 0.12),
      0 0 36px rgba(255, 122, 47, 0.16);
    color: var(--ui-text);
    text-align: center;
    backdrop-filter: blur(12px);
    animation: popIn 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
  }
  #overlay .menu-card {
    max-width: min(92vw, 460px);
    max-height: min(92vh, 690px);
    overflow-y: auto;
    margin-left: clamp(0px, 4vw, 72px);
    margin-right: auto;
    text-align: left;
  }
  #overlay .menu-card::before {
    content: "";
    position: absolute;
    left: 16px;
    right: 16px;
    top: 0;
    height: 3px;
    border-radius: 0 0 8px 8px;
    background: linear-gradient(90deg, var(--ui-orange), var(--ui-gold), var(--ui-blue));
  }
  #overlay .cover-art {
    display: none;
  }
  @keyframes popIn {
    from { opacity: 0; transform: translateY(20px) scale(0.95); }
    to { opacity: 1; transform: translateY(0) scale(1); }
  }
  @keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-5px); }
  }
  button:focus-visible {
    outline: 3px solid rgba(122, 215, 255, 0.9);
    outline-offset: 3px;
  }
  #overlay .menu-status {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    align-items: center;
    justify-content: space-between;
    color: var(--ui-blue);
    font-size: 12px;
    font-weight: 700;
    margin-bottom: 14px;
    text-transform: uppercase;
  }
  #overlay .menu-status span {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    min-height: 26px;
    padding: 5px 9px;
    border: 1px solid rgba(122, 215, 255, 0.2);
    border-radius: 8px;
    background: rgba(122, 215, 255, 0.08);
  }
  #overlay .menu-status i {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: #6ff68e;
    box-shadow: 0 0 10px rgba(111, 246, 142, 0.85);
  }
  #overlay .logo-wrap {
    margin-bottom: 8px;
  }
  #overlay h1 {
    font-size: 52px;
    line-height: 1;
    font-weight: 700;
    background: linear-gradient(90deg, #ff9a4a, #ffd75a, #7ad7ff, #ff9a4a);
    background-size: 300% 100%;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: 0;
    margin-bottom: 2px;
    text-shadow: none;
    animation: shimmer 4s linear infinite;
  }
  @keyframes shimmer {
    0% { background-position: 0% 50%; }
    100% { background-position: 300% 50%; }
  }
  #overlay h2 {
    font-size: 17px;
    color: var(--ui-gold);
    letter-spacing: 0;
    margin-top: 6px;
    font-weight: 600;
  }
  #overlay p.tagline {
    color: #f4e7d2;
    font-size: 15px;
    line-height: 1.5;
    max-width: 380px;
    margin: 0 0 14px;
    opacity: 0.94;
  }
  #overlay .mission-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 14px;
  }
  #overlay .mission-chips span {
    color: #dbeef5;
    font-size: 12px;
    font-weight: 700;
    padding: 6px 9px;
    border-radius: 8px;
    border: 1px solid rgba(255, 255, 255, 0.11);
    background: rgba(255, 255, 255, 0.07);
  }
  #overlay .panel {
    background: rgba(3, 11, 18, 0.56);
    border-radius: 8px;
    padding: 14px;
    margin-bottom: 14px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.06);
  }
  #overlay .panel-compact {
    padding: 14px;
    margin-bottom: 14px;
  }
  #overlay .panel-title {
    color: var(--ui-gold);
    font-size: 12px;
    letter-spacing: 0;
    margin-bottom: 10px;
    font-weight: 700;
  }
  #overlay .help-backdrop {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.72);
    backdrop-filter: blur(4px);
    z-index: var(--z-help-backdrop);
    animation: fadeIn 0.2s ease-out;
  }
  #overlay .help-backdrop.show { display: block; }
  #overlay .help-panel {
    display: none;
    position: fixed;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%) scale(0.96);
    max-width: min(92vw, 420px);
    width: 100%;
    max-height: min(80vh, 520px);
    overflow-y: auto;
    background: var(--ui-panel-strong);
    border: 1px solid var(--ui-line);
    border-radius: 8px;
    padding: 22px;
    box-shadow: 0 24px 70px rgba(0,0,0,0.7), 0 0 30px rgba(255,138,58,0.2);
    z-index: var(--z-help-panel);
    text-align: left;
    animation: popIn 0.25s ease-out forwards;
  }
  #overlay .help-panel.show { display: block; }
  #overlay .help-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 14px;
  }
  #overlay .help-header h3 {
    color: var(--ui-gold);
    font-size: 17px;
    font-weight: 700;
    letter-spacing: 0;
    margin: 0;
  }
  #overlay .help-close {
    background: rgba(255,255,255,0.08);
    color: var(--ui-gold);
    border: 1px solid rgba(255,206,90,0.25);
    border-radius: 50%;
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 14px;
    transition: all 0.18s;
  }
  #overlay .help-close:hover { background: rgba(255,90,31,0.3); color: #fff; transform: rotate(90deg); }
  @keyframes fadeIn {
    from { opacity: 0; transform: translateY(-6px); }
    to { opacity: 1; transform: translateY(0); }
  }
  #overlay .keys {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 8px 12px;
    font-size: 13px;
    color: #f0e8e0;
    text-align: left;
  }
  #overlay .keys b {
    color: var(--ui-blue);
    font-weight: 600;
    letter-spacing: 0;
    background: rgba(90,215,255,0.12);
    padding: 2px 5px;
    border-radius: 4px;
    border: 1px solid rgba(90,215,255,0.2);
    white-space: nowrap;
  }
  #overlay .difficulty {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 6px;
    padding: 5px;
    border-radius: 8px;
    background: rgba(0, 0, 0, 0.22);
    border: 1px solid rgba(255, 255, 255, 0.08);
  }
  #overlay .diff-btn {
    position: relative;
    display: flex;
    min-width: 0;
    min-height: 62px;
    flex-direction: column;
    align-items: flex-start;
    justify-content: center;
    gap: 3px;
    background: transparent;
    border: 1px solid transparent;
    color: #dce8ef;
    padding: 9px 10px 9px 24px;
    border-radius: 8px;
    cursor: pointer;
    font-family: inherit;
    font-weight: 600;
    transition: all 0.18s;
  }
  #overlay .diff-btn::before {
    content: "";
    position: absolute;
    left: 10px;
    top: 15px;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--ui-gold);
    box-shadow: 0 0 10px currentColor;
  }
  #overlay .diff-btn[data-diff="easy"]::before { background: #6ff68e; }
  #overlay .diff-btn[data-diff="normal"]::before { background: var(--ui-gold); }
  #overlay .diff-btn[data-diff="hard"]::before { background: var(--ui-danger); }
  #overlay .diff-name {
    font-size: 14px;
    line-height: 1.1;
  }
  #overlay .diff-note {
    color: var(--ui-muted);
    font-size: 11px;
    line-height: 1.2;
    white-space: nowrap;
  }
  #overlay .diff-btn:hover {
    background: rgba(255,255,255,0.1);
    transform: translateY(-1px);
  }
  #overlay .diff-btn.active {
    background: linear-gradient(180deg, #ffd36a, #ff7a2f);
    border-color: rgba(255, 238, 180, 0.75);
    color: #111920;
    box-shadow: 0 8px 20px rgba(255,90,31,0.25);
  }
  #overlay .diff-btn.active .diff-note {
    color: rgba(17, 25, 32, 0.72);
  }
  #overlay .difficulty-summary {
    min-height: 34px;
    margin-top: 10px;
    color: #d8edf5;
    font-size: 13px;
    line-height: 1.45;
  }
  #overlay .menu-actions {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 10px;
    align-items: stretch;
  }
  #overlay .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 52px;
    background: linear-gradient(180deg, #ffd36a, #ff7a2f);
    color: #111920;
    border: none;
    padding: 12px 28px;
    font-family: inherit;
    font-size: 18px;
    font-weight: 700;
    letter-spacing: 0;
    cursor: pointer;
    border-radius: 8px;
    box-shadow: 0 5px 0 #9a2a00, 0 12px 26px rgba(255,90,31,0.34);
    transition: transform 0.1s, box-shadow 0.1s;
  }
  #overlay .btn-secondary {
    min-width: 116px;
    background: rgba(255,255,255,0.08);
    color: var(--ui-gold);
    border: 1px solid rgba(255,206,90,0.34);
    box-shadow: none;
    padding: 12px 16px;
    font-size: 14px;
  }
  #overlay .btn-secondary:hover { background: rgba(255,206,90,0.25); color: #fff; transform: translateY(-2px); box-shadow: 0 4px 14px rgba(255,206,90,0.2); }
  #overlay .btn:hover { transform: translateY(-2px); box-shadow: 0 7px 0 #9a2a00, 0 16px 32px rgba(255,90,31,0.46); }
  #overlay .btn:active { transform: translateY(2px); box-shadow: 0 2px 0 #9a2a00, 0 4px 12px rgba(255,90,31,0.35); }
  #overlay .btn:disabled {
    background: #555;
    box-shadow: none;
    color: #aaa;
    cursor: not-allowed;
    transform: none;
  }
  #overlay .cat-icon {
    font-size: 48px;
    margin-bottom: 6px;
  }
  #overlay .end-title {
    font-size: 40px;
    background: linear-gradient(90deg, #ff9a4a, #ffd75a, #7ad7ff, #ff9a4a);
    background-size: 300% 100%;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: shimmer 4s linear infinite;
  }
  #overlay .end-subtitle {
    margin-bottom: 10px;
  }
  #overlay .end-victory { color: #5ad7ff; }
  #overlay .end-defeat { color: #ff4a4a; }
  #overlay .final { color: #ff4a4a; font-size: 24px; margin: 4px 0 14px; }
  #overlay .final-score {
    font-size: 24px;
    margin: 10px 0 6px;
  }
  #overlay .final-high-score {
    color: #ccc;
    font-size: 16px;
    margin-bottom: 18px;
  }
  #overlay .end-card {
    max-width: min(96%, 560px);
  }
  #overlay .end-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
    width: 100%;
    max-width: 460px;
    margin: 10px auto 14px;
  }
  #overlay .end-stat {
    background: rgba(0,0,0,0.28);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: 8px;
    padding: 8px 6px;
    min-width: 0;
  }
  #overlay .end-stat-label {
    color: #aeb8c8;
    font-size: 11px;
    margin-bottom: 3px;
  }
  #overlay .end-stat-value {
    color: #ffce5a;
    font-size: 18px;
    font-weight: 700;
    line-height: 1.1;
  }
  #overlay .hint {
    color: var(--ui-muted);
    font-size: 12px;
    margin-top: 12px;
    letter-spacing: 0;
    line-height: 1.45;
  }
  #overlay .card::-webkit-scrollbar {
    display: none;
  }
  /* 暂停菜单 */
  #pauseOverlay {
    display: none;
    position: absolute;
    inset: 0;
    background:
      repeating-linear-gradient(180deg, rgba(255,255,255,0.035) 0 1px, transparent 1px 6px),
      linear-gradient(180deg, rgba(3, 9, 15, 0.72), rgba(3, 9, 15, 0.86));
    z-index: var(--z-pause);
    align-items: center;
    justify-content: center;
    text-align: left;
    padding: clamp(14px, 3vw, 30px);
    backdrop-filter: blur(5px);
  }
  #pauseOverlay .pause-card {
    position: relative;
    width: min(92vw, 520px);
    max-height: calc(100% - 18px);
    overflow-y: auto;
    background:
      linear-gradient(180deg, rgba(20, 43, 58, 0.96), rgba(7, 16, 25, 0.97));
    border: 1px solid rgba(255, 220, 128, 0.34);
    border-radius: 8px;
    padding: 22px;
    box-shadow: 0 28px 80px rgba(0,0,0,0.72), inset 0 1px 0 rgba(255,255,255,0.08);
    scrollbar-width: none;
  }
  #pauseOverlay .pause-card::-webkit-scrollbar { display: none; }
  #pauseOverlay .pause-card::before {
    content: "";
    position: absolute;
    left: 16px;
    right: 16px;
    top: 0;
    height: 3px;
    border-radius: 0 0 8px 8px;
    background: linear-gradient(90deg, var(--ui-blue), var(--ui-gold), var(--ui-orange));
  }
  #pauseOverlay .pause-topline,
  #pauseOverlay .pause-stage-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
  }
  #pauseOverlay .pause-topline { margin-bottom: 18px; }
  #pauseOverlay .pause-kicker,
  #pauseOverlay .pause-status,
  #pauseOverlay .pause-stage-count {
    display: inline-flex;
    align-items: center;
    min-height: 26px;
    border-radius: 8px;
    border: 1px solid rgba(255,255,255,0.1);
    background: rgba(0,0,0,0.2);
    color: var(--ui-muted);
    padding: 5px 9px;
    font-size: 12px;
    line-height: 1;
    white-space: nowrap;
  }
  #pauseOverlay .pause-kicker {
    color: var(--ui-gold);
    font-weight: 700;
  }
  #pauseOverlay .pause-kicker i {
    display: inline-block;
    width: 7px;
    height: 7px;
    margin-right: 7px;
    border-radius: 50%;
    background: #6ff68e;
    box-shadow: 0 0 10px rgba(111,246,142,0.8);
  }
  #pauseOverlay .pause-title-row {
    display: grid;
    grid-template-columns: 58px 1fr;
    gap: 14px;
    align-items: center;
    margin-bottom: 18px;
  }
  #pauseOverlay .pause-mark {
    width: 58px;
    height: 58px;
    border-radius: 8px;
    border: 1px solid rgba(122, 215, 255, 0.34);
    background: linear-gradient(180deg, rgba(122,215,255,0.18), rgba(255,206,90,0.08));
    box-shadow: inset 0 0 18px rgba(122,215,255,0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 7px;
  }
  #pauseOverlay .pause-mark span {
    width: 8px;
    height: 28px;
    border-radius: 3px;
    background: var(--ui-gold);
    box-shadow: 0 0 14px rgba(255,206,90,0.35);
  }
  #pauseOverlay .pause-title {
    font-size: 30px;
    line-height: 1;
    color: var(--ui-text);
    letter-spacing: 0;
    margin: 0 0 7px;
    font-weight: 700;
  }
  #pauseOverlay .pause-subtitle {
    color: var(--ui-muted);
    font-size: 13px;
    line-height: 1.45;
    margin: 0;
  }
  #pauseOverlay .pause-actions {
    display: grid;
    grid-template-columns: 1.25fr 1fr;
    gap: 10px;
    margin-bottom: 14px;
  }
  #pauseOverlay .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    border-radius: 8px;
    border: none;
    padding: 11px 18px;
    font-family: inherit;
    font-size: 16px;
    font-weight: 700;
    letter-spacing: 0;
    cursor: pointer;
    transition: transform 0.1s, box-shadow 0.1s, background 0.18s, color 0.18s;
  }
  #pauseOverlay .pause-primary {
    background: linear-gradient(180deg, #ffd36a, #ff7a2f);
    color: #111920;
    box-shadow: 0 4px 0 #9a2a00, 0 12px 24px rgba(255,90,31,0.34);
  }
  #pauseOverlay .pause-primary:hover { transform: translateY(-2px); box-shadow: 0 6px 0 #9a2a00, 0 16px 28px rgba(255,90,31,0.44); }
  #pauseOverlay .pause-primary:active { transform: translateY(2px); box-shadow: 0 2px 0 #9a2a00, 0 5px 12px rgba(255,90,31,0.32); }
  #pauseOverlay .pause-secondary {
    min-width: 0;
    background: rgba(255,255,255,0.08);
    color: var(--ui-gold);
    border: 1px solid rgba(255,206,90,0.3);
    box-shadow: none;
  }
  #pauseOverlay .pause-secondary:hover { background: rgba(255,206,90,0.22); color: #fff; transform: translateY(-2px); }
  #pauseOverlay .pause-stage-select {
    padding: 14px;
    border-radius: 8px;
    border: 1px solid rgba(122, 215, 255, 0.18);
    background: rgba(0, 0, 0, 0.22);
  }
  #pauseOverlay .pause-stage-title {
    color: var(--ui-gold);
    font-size: 14px;
    font-weight: 700;
    letter-spacing: 0;
    line-height: 1.2;
  }
  #pauseOverlay .pause-stage-note {
    color: var(--ui-muted);
    font-size: 12px;
    line-height: 1.4;
    margin-top: 3px;
  }
  #pauseOverlay .pause-stage-count {
    color: var(--ui-blue);
  }
  #pauseOverlay .pause-stage-list {
    display: grid;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 8px;
    margin: 12px 0;
  }
  #pauseOverlay .pause-stage-btn {
    min-width: 0;
    min-height: 42px;
    border-radius: 8px;
    border: 1px solid rgba(255,255,255,0.14);
    background: rgba(255,255,255,0.07);
    color: #dce8ef;
    font-family: inherit;
    font-size: 14px;
    font-weight: 700;
    cursor: pointer;
    transition: transform 0.12s, background 0.18s, border-color 0.18s, color 0.18s;
  }
  #pauseOverlay .pause-stage-btn:hover { background: rgba(255,255,255,0.14); transform: translateY(-1px); }
  #pauseOverlay .pause-stage-btn.active {
    background: linear-gradient(180deg, #7ad7ff, #3a8aff);
    border-color: rgba(190,235,255,0.82);
    color: #061028;
    box-shadow: 0 6px 16px rgba(58,138,255,0.28);
  }
  #pauseOverlay .btn-stage {
    width: 100%;
    min-height: 42px;
    background: rgba(122,215,255,0.13);
    color: var(--ui-blue);
    border: 1px solid rgba(122,215,255,0.34);
    box-shadow: none;
    font-size: 14px;
  }
  #pauseOverlay .btn-stage:hover { background: rgba(122,215,255,0.22); color: #fff; transform: translateY(-1px); }

  /* 移动端虚拟按键 */
  #mobileControls {
    display: none;
    position: absolute;
    inset: 0;
    z-index: var(--z-mobile-controls);
    pointer-events: none;
    touch-action: none;
    --control-size: clamp(54px, 12vw, 82px);
    --control-gap: clamp(7px, 1.6vw, 12px);
    --control-edge: 12px;
    --control-bottom: max(12px, calc(env(safe-area-inset-bottom, 0px) + 10px));
    --control-left: max(var(--control-edge), calc(env(safe-area-inset-left, 0px) + var(--control-edge)));
    --control-right: max(var(--control-edge), calc(env(safe-area-inset-right, 0px) + var(--control-edge)));
  }
  #mobileControls.show.active { display: block; }
  #mobileControls .mobile-pad {
    position: absolute;
    bottom: var(--control-bottom);
    display: grid;
    gap: var(--control-gap);
    pointer-events: none;
  }
  #mobileControls .mobile-pad-move {
    left: var(--control-left);
    grid-template-columns: repeat(3, var(--control-size));
    grid-template-rows: repeat(2, var(--control-size));
  }
  #mobileControls .mobile-pad-actions {
    right: var(--control-right);
    grid-template-columns: repeat(2, var(--control-size));
    grid-template-rows: var(--control-size);
  }
  #mobileControls .mbtn {
    position: relative;
    pointer-events: auto;
    width: var(--control-size);
    height: var(--control-size);
    border-radius: 50%;
    border: 2px solid rgba(255,255,255,0.35);
    background: rgba(255,255,255,0.12);
    color: rgba(255,255,255,0.9);
    font-size: 28px;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    user-select: none;
    -webkit-user-select: none;
    touch-action: manipulation;
    transition: background 0.08s, transform 0.08s;
    text-shadow: 0 1px 2px rgba(0,0,0,0.5);
  }
  #mobileControls .mbtn:active, #mobileControls .mbtn.active {
    background: rgba(255,255,255,0.32);
    transform: scale(0.95);
  }
  #btnUp { grid-column: 2; grid-row: 1; }
  #btnLeft { grid-column: 1; grid-row: 2; }
  #btnDown { grid-column: 2; grid-row: 2; }
  #btnRight { grid-column: 3; grid-row: 2; }
  #btnJump { grid-column: 1; grid-row: 1; }
  #btnFire { grid-column: 2; grid-row: 1; }

  /* 加载界面 */
  #loadingOverlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, #2a1642 0%, #181030 50%, #421e1e 100%);
    z-index: var(--z-loading);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    opacity: 1;
    visibility: visible;
    transition: opacity 0.4s ease-out, visibility 0.4s ease-out;
  }
  #loadingOverlay.hide { opacity: 0; visibility: hidden; pointer-events: none; }
  .stage-message {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 10;
    pointer-events: none;
    color: #5ad7ff;
    font-size: 28px;
    text-shadow: 0 0 10px #000;
  }
  #loadingOverlay .loading-mascot {
    animation: float 2.5s ease-in-out infinite;
    font-size: 64px;
    margin-bottom: 12px;
  }
  #loadingOverlay .loading-title {
    font-size: 40px;
    font-weight: 700;
    background: linear-gradient(90deg, #ff9a4a, #ffd75a, #7ad7ff, #ff9a4a);
    background-size: 300% 100%;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: shimmer 4s linear infinite;
    margin-bottom: 8px;
  }
  #loadingOverlay .loading-progress {
    width: min(70%, 320px);
    height: 10px;
    background: rgba(255,255,255,0.12);
    border-radius: 5px;
    overflow: hidden;
    margin: 18px 0 10px;
    box-shadow: 0 0 20px rgba(255,138,58,0.2);
  }
  #loadingOverlay .loading-bar {
    width: 0%;
    height: 100%;
    background: linear-gradient(90deg, #ff8a3a, #ffce5a);
    transition: width 0.2s ease-out;
  }
  #loadingOverlay .loading-text {
    color: #ffce5a;
    font-size: 16px;
    font-weight: 600;
  }
  #loadingOverlay .loading-note {
    color: #999;
    font-size: 12px;
    margin-top: 12px;
  }

  @media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
      animation-duration: 0.01ms !important;
      animation-iteration-count: 1 !important;
      transition-duration: 0.01ms !important;
      scroll-behavior: auto !important;
    }
  }

  @media (max-width: 760px) {
    #overlay {
      align-items: flex-end;
      justify-content: center;
      padding: 16px;
      background-position: 58% center;
    }
    #overlay .menu-card {
      max-width: min(100%, 440px);
      max-height: calc(100vh - 32px);
      margin: 0 auto;
      padding: 18px;
    }
    #overlay .menu-status {
      font-size: 11px;
      margin-bottom: 12px;
    }
    #overlay .menu-status span {
      min-height: 24px;
      padding: 4px 8px;
    }
    #overlay h1 { font-size: 38px; }
    #life .life-heart { width: 16px; height: 16px; }
    #overlay h2 { font-size: 15px; }
    #overlay p.tagline {
      font-size: 14px;
      margin-bottom: 12px;
    }
    #overlay .mission-chips {
      gap: 6px;
      margin-bottom: 12px;
    }
    #overlay .mission-chips span {
      font-size: 11px;
      padding: 5px 8px;
    }
    #overlay .panel,
    #overlay .panel-compact {
      padding: 12px;
      margin-bottom: 12px;
    }
    #overlay .diff-btn {
      min-height: 56px;
      padding: 8px 8px 8px 23px;
    }
    #overlay .diff-name { font-size: 13px; }
    #overlay .diff-note { font-size: 11px; }
    #overlay .difficulty-summary { font-size: 12px; }
    #overlay .menu-actions {
      grid-template-columns: 1fr;
      gap: 8px;
    }
    #overlay .btn {
      min-height: 50px;
      font-size: 17px;
      padding: 11px 20px;
    }
    #overlay .btn-secondary {
      min-width: 0;
      min-height: 44px;
      font-size: 13px;
    }
    #overlay .help-panel {
      max-width: calc(100vw - 28px);
      max-height: 84vh;
      padding: 18px;
    }
    #overlay .help-panel .keys {
      grid-template-columns: 1fr;
      gap: 5px;
      font-size: 12px;
    }
    #overlay .keys b {
      display: inline-block;
      margin-right: 6px;
      padding: 2px 4px;
    }
    #overlay .end-stats {
      grid-template-columns: repeat(2, 1fr);
      gap: 6px;
    }
    #overlay .hint {
      font-size: 12px;
      margin-top: 9px;
    }
    #pauseOverlay .pause-card {
      width: min(94vw, 480px);
      padding: 18px;
    }
    #pauseOverlay .pause-title-row {
      grid-template-columns: 50px 1fr;
      gap: 12px;
      margin-bottom: 14px;
    }
    #pauseOverlay .pause-mark {
      width: 50px;
      height: 50px;
    }
    #pauseOverlay .pause-mark span {
      height: 24px;
    }
    #pauseOverlay .pause-title {
      font-size: 24px;
    }
    #pauseOverlay .pause-actions {
      grid-template-columns: 1fr;
      gap: 8px;
    }
    #pauseOverlay .pause-stage-list {
      gap: 6px;
    }
  }
  @media (max-width: 420px) {
    #mobileControls {
      --control-size: clamp(46px, 13vw, 54px);
      --control-gap: 6px;
      --control-edge: 8px;
      --control-bottom: max(8px, calc(env(safe-area-inset-bottom, 0px) + 8px));
    }
    #overlay {
      padding: 10px;
      background-position: 55% center;
    }
    #overlay .menu-card {
      max-height: calc(100vh - 20px);
      padding: 15px;
    }
    #overlay .menu-status {
      gap: 6px;
      margin-bottom: 10px;
    }
    #overlay h1 { font-size: 32px; }
    #overlay h2 { font-size: 14px; }
    #overlay p.tagline {
      font-size: 13px;
      line-height: 1.45;
      margin-bottom: 10px;
    }
    #overlay .mission-chips { margin-bottom: 10px; }
    #overlay .panel,
    #overlay .panel-compact {
      padding: 10px;
      margin-bottom: 10px;
    }
    #overlay .difficulty {
      grid-template-columns: 1fr;
      gap: 5px;
    }
    #overlay .diff-btn {
      min-height: 46px;
      padding: 7px 10px 7px 24px;
    }
    #overlay .diff-btn::before { top: 14px; }
    #overlay .diff-note { font-size: 11px; }
    #overlay .difficulty-summary {
      min-height: 0;
      margin-top: 8px;
    }
    #overlay .btn {
      min-height: 48px;
      font-size: 16px;
    }
    #overlay .btn-secondary { font-size: 13px; }
    #overlay .help-header h3 { font-size: 15px; }
    #overlay .help-close { width: 26px; height: 26px; }
    #overlay .end-stats {
      grid-template-columns: repeat(2, 1fr);
      margin: 8px auto 10px;
    }
    #overlay .end-stat { padding: 6px 4px; }
    #overlay .end-stat-label { font-size: 10px; }
    #overlay .end-stat-value { font-size: 14px; }
    #pauseOverlay .pause-card {
      padding: 14px;
    }
    #pauseOverlay .pause-topline {
      margin-bottom: 12px;
    }
    #pauseOverlay .pause-status {
      display: none;
    }
    #pauseOverlay .pause-title-row {
      grid-template-columns: 42px 1fr;
    }
    #pauseOverlay .pause-mark {
      width: 42px;
      height: 42px;
      gap: 5px;
    }
    #pauseOverlay .pause-mark span {
      width: 6px;
      height: 20px;
    }
    #pauseOverlay .pause-title {
      font-size: 20px;
    }
    #pauseOverlay .pause-subtitle,
    #pauseOverlay .pause-stage-note {
      font-size: 12px;
    }
    #pauseOverlay .btn {
      min-height: 42px;
      font-size: 14px;
      padding: 9px 12px;
    }
    #pauseOverlay .pause-stage-select {
      padding: 10px;
    }
    #pauseOverlay .pause-stage-btn {
      min-height: 36px;
      font-size: 13px;
    }
  }
  @media (max-height: 520px) {
    #overlay {
      align-items: center;
      padding: 10px;
    }
    #overlay .menu-card {
      max-height: calc(100vh - 20px);
      padding: 14px 16px;
    }
    #overlay .menu-status,
    #overlay .mission-chips,
    #overlay .hint {
      display: none;
    }
    #overlay .logo-wrap { margin-bottom: 5px; }
    #overlay h1 { font-size: 30px; }
    #overlay h2 { font-size: 13px; margin-top: 3px; }
    #overlay p.tagline {
      font-size: 12px;
      margin-bottom: 8px;
    }
    #overlay .panel,
    #overlay .panel-compact {
      padding: 9px;
      margin-bottom: 8px;
    }
    #overlay .panel-title {
      font-size: 11px;
      margin-bottom: 6px;
    }
    #overlay .difficulty {
      grid-template-columns: repeat(3, 1fr);
    }
    #overlay .diff-btn {
      min-height: 42px;
      padding: 6px 6px 6px 22px;
    }
    #overlay .diff-btn::before {
      left: 9px;
      top: 12px;
    }
    #overlay .diff-name { font-size: 12px; }
    #overlay .diff-note { display: none; }
    #overlay .difficulty-summary {
      min-height: 0;
      margin-top: 6px;
      font-size: 12px;
      line-height: 1.35;
    }
    #overlay .menu-actions {
      grid-template-columns: 1fr auto;
    }
    #overlay .btn {
      min-height: 42px;
      font-size: 14px;
      padding: 8px 16px;
    }
    #overlay .btn-secondary {
      min-width: 94px;
      font-size: 12px;
      padding: 8px 12px;
    }
    #overlay .help-panel {
      padding: 12px;
      max-width: 92vw;
      max-height: 85vh;
    }
    #overlay .help-header h3 { font-size: 13px; }
    #overlay .help-panel .keys { font-size: 11px; }
    #overlay .end-stats {
      gap: 5px;
      margin: 5px auto 7px;
    }
    #overlay .end-stat { padding: 4px 3px; }
    #overlay .end-stat-label { font-size: 10px; }
    #overlay .end-stat-value { font-size: 12px; }
    #pauseOverlay .pause-card {
      max-height: calc(100vh - 16px);
      padding: 12px 16px;
    }
    #pauseOverlay .pause-topline {
      margin-bottom: 10px;
    }
    #pauseOverlay .pause-title-row {
      grid-template-columns: 42px 1fr;
      margin-bottom: 10px;
    }
    #pauseOverlay .pause-mark {
      width: 42px;
      height: 42px;
    }
    #pauseOverlay .pause-title {
      font-size: 20px;
    }
    #pauseOverlay .pause-actions {
      margin-bottom: 10px;
    }
    #pauseOverlay .pause-stage-list {
      margin: 8px 0;
    }
    #pauseOverlay .btn,
    #pauseOverlay .pause-stage-btn {
      min-height: 36px;
      font-size: 13px;
    }
  }
  @media (max-height: 360px) {
    #mobileControls {
      --control-size: clamp(42px, 14vh, 54px);
      --control-gap: 6px;
      --control-edge: 10px;
      --control-bottom: max(8px, calc(env(safe-area-inset-bottom, 0px) + 6px));
    }
    #overlay .menu-card {
      max-width: min(94vw, 560px);
      padding: 10px 12px;
    }
    #overlay h1 { font-size: 24px; }
    #overlay h2 { font-size: 12px; }
    #overlay p.tagline { display: none; }
    #overlay .panel,
    #overlay .panel-compact {
      padding: 7px;
      margin-bottom: 7px;
    }
    #overlay .difficulty-summary { display: none; }
    #overlay .btn {
      min-height: 36px;
      font-size: 13px;
      padding: 6px 14px;
    }
    #overlay .btn-secondary {
      min-width: 88px;
      font-size: 11px;
    }
    #overlay .help-panel {
      padding: 10px;
    }
    #overlay .help-panel .keys {
      font-size: 11px;
      gap: 3px;
    }
    #overlay .end-stats {
      grid-template-columns: repeat(3, 1fr);
      gap: 3px;
      margin: 3px auto 4px;
    }
    #pauseOverlay .pause-card {
      padding: 9px 12px;
    }
    #pauseOverlay .pause-topline,
    #pauseOverlay .pause-subtitle,
    #pauseOverlay .pause-stage-note {
      display: none;
    }
    #pauseOverlay .pause-title-row {
      grid-template-columns: 32px 1fr;
      margin-bottom: 8px;
    }
    #pauseOverlay .pause-mark {
      width: 32px;
      height: 32px;
    }
    #pauseOverlay .pause-mark span {
      width: 5px;
      height: 16px;
    }
    #pauseOverlay .pause-title {
      font-size: 16px;
    }
    #pauseOverlay .pause-stage-select {
      padding: 8px;
    }
    #pauseOverlay .pause-stage-btn {
      min-height: 30px;
    }
  }