* { margin: 0; padding: 0; box-sizing: border-box; -webkit-tap-highlight-color: transparent; }

  html {
    overflow-x: hidden;
    -webkit-text-size-adjust: 100%;
    text-size-adjust: 100%;
  }

  body {
    background: #0a0a0f;
    color: #a8a8b8;
    font-family: 'EmptyStackFont', "Noto Serif SC", "SimSun", serif;
    line-height: 1.95;
    padding: calc(env(safe-area-inset-top) + 56px)
             calc(env(safe-area-inset-right) + 22px)
             calc(env(safe-area-inset-bottom) + 96px)
             calc(env(safe-area-inset-left) + 22px);
    min-height: 100vh;
    min-height: 100dvh;
    position: relative;
    overflow-x: hidden;
    -webkit-overflow-scrolling: touch;
  }

  body.gate-lock {
    overflow: hidden;
    height: 100vh;
    height: 100dvh;
    touch-action: none;
    overscroll-behavior: none;
  }

  body::before {
    content: '';
    position: fixed;
    inset: -20%;
    background:
      radial-gradient(ellipse 50% 40% at 30% 25%, rgba(40,45,70,0.35) 0%, transparent 60%),
      radial-gradient(ellipse 45% 40% at 70% 70%, rgba(30,30,45,0.3) 0%, transparent 55%),
      linear-gradient(180deg, #0a0a0f 0%, #111119 45%, #0d0d14 100%);
    z-index: -2;
    animation: glowDrift 26s ease-in-out infinite alternate;
    will-change: transform;
  }
  @keyframes glowDrift {
    0%   { transform: translate3d(-3%, -2%, 0) scale(1.05); }
    100% { transform: translate3d(3%, 2%, 0) scale(1.12); }
  }

  .dust {
    position: fixed;
    border-radius: 50%;
    background: rgba(200,205,230,0.5);
    pointer-events: none;
    z-index: -1;
    will-change: transform, opacity;
    animation: dustFloat linear infinite;
  }
  @keyframes dustFloat {
    0%   { transform: translate3d(0,0,0) scale(0.4); opacity: 0; }
    15%  { opacity: 0.5; }
    85%  { opacity: 0.3; }
    100% { transform: translate3d(var(--dx,12px), -110vh, 0) scale(0.1); opacity: 0; }
  }

  /* ── 进入前的提示弹窗 ── */
  .disclaimer {
    position: fixed;
    inset: 0;
    z-index: 200;
    background: #08080c;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: calc(env(safe-area-inset-top) + 28px) 24px calc(env(safe-area-inset-bottom) + 28px);
    transition: opacity 0.8s ease;
  }
  .disclaimer.hide { opacity: 0; pointer-events: none; }

  .disclaimer-box {
    max-width: 420px;
    width: 100%;
    max-height: 100%;
    overflow-y: auto;
    touch-action: pan-y;
    overscroll-behavior: contain;
    -webkit-overflow-scrolling: touch;
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: 18px;
    background: rgba(255,255,255,0.015);
    padding: 30px 26px 26px;
  }
  .disclaimer-title {
    font-family: 'EmptyStackFont', serif;
    font-size: 1.05rem;
    color: rgba(255,255,255,0.55);
    letter-spacing: 0.22em;
    text-align: center;
    margin-bottom: 22px;
  }
  .disclaimer-body {
    font-family: 'EmptyStackFont', "Noto Serif SC", serif;
    font-size: 0.82rem;
    line-height: 2;
    color: rgba(255,255,255,0.4);
    letter-spacing: 0.03em;
  }
  .disclaimer-body p { margin-bottom: 14px; }
  .disclaimer-hotline {
    color: rgba(255,255,255,0.55);
    letter-spacing: 0.06em;
    padding: 12px 16px;
    border-radius: 10px;
    background: rgba(255,255,255,0.03);
    border: 1px solid rgba(255,255,255,0.06);
  }
  .disclaimer-hotline a {
    color: rgba(255,255,255,0.82);
    text-decoration: none;
    border-bottom: 1px solid rgba(255,255,255,0.25);
    padding-bottom: 1px;
    letter-spacing: 0.04em;
    transition: color 0.3s, border-color 0.3s;
  }
  .disclaimer-hotline a:active {
    color: #fff;
    border-color: rgba(255,255,255,0.6);
  }
  .inline-emoji {
    display: inline-block;
    width: 1.9em;
    height: 1.9em;
    vertical-align: -0.23em;
    margin-left: 3px;
  }
  .disclaimer-btn {
    display: block;
    margin: 26px auto 0;
    background: transparent;
    border: 1px solid rgba(255,255,255,0.14);
    color: rgba(255,255,255,0.5);
    font-family: 'EmptyStackFont', serif;
    font-size: 0.86rem;
    letter-spacing: 0.18em;
    padding: 12px 34px;
    border-radius: 26px;
    cursor: pointer;
    outline: none;
    -webkit-appearance: none;
    appearance: none;
    transition: color 0.3s, border-color 0.3s, transform 0.3s;
  }
  .disclaimer-btn:active {
    transform: scale(0.95);
    color: rgba(255,255,255,0.7);
    border-color: rgba(255,255,255,0.3);
  }

  .gate {
    position: fixed;
    inset: 0;
    background: #0a0a0f;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
    transition: opacity 1.4s ease;
  }
  .gate.hide { opacity: 0; pointer-events: none; }

  .gate-inner {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
  }

  .enter-btn {
    background: transparent;
    border: 1px solid rgba(255,255,255,0.15);
    color: rgba(255,255,255,0.5);
    font-family: 'EmptyStackFont', serif;
    font-size: 0.95rem;
    letter-spacing: 0.4em;
    padding: 14px 40px 14px 44px;
    border-radius: 30px;
    cursor: pointer;
    outline: none;
    -webkit-appearance: none;
    appearance: none;
    transition: transform 0.3s;
    animation: enterPulse 3.2s ease-in-out infinite;
  }
  .enter-btn:active { transform: scale(0.95); }
  .enter-btn:disabled {
    opacity: 0.3;
    cursor: default;
    animation: none;
    border-color: rgba(255,255,255,0.08);
    color: rgba(255,255,255,0.22);
  }
  @keyframes enterPulse {
    0%,100% { border-color: rgba(255,255,255,0.12); color: rgba(255,255,255,0.4); }
    50%     { border-color: rgba(255,255,255,0.28); color: rgba(255,255,255,0.62); }
  }

  .load-bar {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 7px;
    transition: opacity 0.7s ease;
  }
  .load-bar.done { opacity: 0; pointer-events: none; }
  .load-bar-track {
    width: 160px;
    height: 2px;
    background: rgba(255,255,255,0.06);
    border-radius: 2px;
    overflow: hidden;
  }
  .load-bar-fill {
    height: 100%;
    background: rgba(255,255,255,0.28);
    border-radius: 2px;
    width: 0%;
    transition: width 0.3s ease;
    will-change: width;
  }
  .load-pct {
    font-family: 'EmptyStackFont', serif;
    font-size: 0.6rem;
    color: rgba(255,255,255,0.18);
    letter-spacing: 0.08em;
  }

  .sound-btn {
    position: fixed;
    top: calc(env(safe-area-inset-top) + 16px);
    right: calc(env(safe-area-inset-right) + 18px);
    background: transparent;
    border: 1px solid rgba(255,255,255,0.07);
    color: rgba(255,255,255,0.2);
    font-family: 'EmptyStackFont', serif;
    font-size: 0.68rem;
    letter-spacing: 0.12em;
    padding: 5px 13px;
    border-radius: 20px;
    cursor: pointer;
    z-index: 90;
    outline: none;
    -webkit-appearance: none;
    appearance: none;
    opacity: 0;
    pointer-events: none;
    transition: color 0.4s, border-color 0.4s, background 0.4s, opacity 0.8s, transform 0.3s;
  }
  .sound-btn.shown { opacity: 1; pointer-events: auto; }
  .sound-btn.on {
    color: rgba(255,255,255,0.4);
    border-color: rgba(255,255,255,0.15);
    background: rgba(255,255,255,0.02);
  }
  .sound-btn:active { transform: scale(0.94); }

  .lyrics {
    position: fixed;
    top: calc(env(safe-area-inset-top) + 62px);
    right: calc(env(safe-area-inset-right) + 18px);
    display: flex;
    flex-direction: row-reverse;
    align-items: flex-start;
    gap: 14px;
    z-index: 85;
    height: calc(100dvh - env(safe-area-inset-top) - env(safe-area-inset-bottom) - 120px);
    opacity: 0;
    pointer-events: none;
    transition: opacity 1s ease;
  }
  .lyrics.shown { opacity: 1; }

  .lyric-col {
    -webkit-writing-mode: vertical-rl;
    writing-mode: vertical-rl;
    -webkit-text-orientation: mixed;
    text-orientation: mixed;
    height: 100%;
    flex: 0 0 auto;
    font-family: 'EmptyStackFont', "Hiragino Mincho ProN", "Noto Serif JP", "Noto Serif SC", serif;
    font-size: 0.8rem;
    line-height: 1.7;
    letter-spacing: 0.12em;
    overflow: hidden;
    transition: opacity 0.32s ease;
    white-space: nowrap;
  }
  .lyric-col.fading { opacity: 0; }
  .lyric-main  { color: rgba(255,255,255,0.42); }
  .lyric-trans { color: rgba(255,255,255,0.24); font-size: 0.74rem; }

  .counter-block {
    text-align: left;
    margin-bottom: 60px;
    opacity: 0;
    transform: translateY(14px);
    transition: opacity 2.2s ease, transform 1.8s cubic-bezier(0.16,1,0.3,1);
  }
  .counter-block.visible { opacity: 1; transform: translateY(0); }

  .counter-label {
    font-size: 0.68rem;
    color: rgba(255,255,255,0.18);
    letter-spacing: 0.28em;
    margin-bottom: 12px;
  }
  .counter-num {
    font-size: clamp(3rem, 14vw, 4.5rem);
    font-weight: 300;
    color: rgba(255,255,255,0.32);
    letter-spacing: 0.04em;
    line-height: 1;
    margin-bottom: 10px;
    font-variant-numeric: tabular-nums;
  }
  .counter-num.breathe { animation: numBreathe 5s ease-in-out infinite; }
  @keyframes numBreathe {
    0%,100% { text-shadow: 0 0 12px rgba(200,190,160,0.05); color: rgba(255,255,255,0.32); }
    50%     { text-shadow: 0 0 22px rgba(210,195,160,0.18); color: rgba(255,255,255,0.42); }
  }
  .counter-sub {
    font-size: 0.7rem;
    color: rgba(255,255,255,0.13);
    letter-spacing: 0.22em;
  }

  .main-text {
    font-size: 0.92rem;
    color: #9a9aae;
    line-height: 2.2;
    margin-bottom: 44px;
    padding: 0 2px;
    text-align: left;
    opacity: 0;
    transform: translateY(12px);
    transition: opacity 2.6s ease, transform 2.2s cubic-bezier(0.16,1,0.3,1);
  }
  .main-text.visible { opacity: 1; transform: translateY(0); }
  .main-text em { font-style: normal; color: #c9bd9c; }

  .letter-img {
    text-align: center;
    margin: 8px 0 40px;
    opacity: 0;
    transform: translateY(12px);
    transition: opacity 2.2s ease, transform 1.8s cubic-bezier(0.16,1,0.3,1);
  }
  .letter-img.visible { opacity: 1; transform: translateY(0); }
  .letter-img img {
    max-width: 70%;
    height: auto;
    border-radius: 8px;
    opacity: 0.9;
  }

  .divider {
    height: 1px;
    margin: 44px 0;
    width: 60%;
    background: linear-gradient(90deg, rgba(255,255,255,0.12), transparent);
    transform: scaleX(0);
    transform-origin: left center;
    transition: transform 1.8s cubic-bezier(0.16,1,0.3,1);
  }
  .divider.grown { transform: scaleX(1); }

  .thanks-section { text-align: center; margin-bottom: 48px; }
  .thanks-phrase {
    font-style: italic;
    font-size: 1.05rem;
    color: rgba(255,255,255,0.45);
    margin-bottom: 28px;
    opacity: 0;
    transform: translateY(8px);
    transition: opacity 1.8s ease, transform 1.5s ease;
  }
  .thanks-phrase.visible { opacity: 1; transform: translateY(0); }
  .thanks-label {
    color: rgba(255,255,255,0.22);
    font-size: 0.72rem;
    letter-spacing: 0.12em;
    margin-bottom: 18px;
    opacity: 0;
    transition: opacity 1.6s ease;
  }
  .thanks-label.visible { opacity: 1; }
  .thanks-names {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 8px 14px;
    line-height: 2;
  }

  .name {
    font-family: 'EmptyStackSttFont', "Noto Serif SC", serif;
    font-size: 0.95rem;
    padding: 3px 4px;
    cursor: pointer;
    opacity: 0;
    transform: translateY(8px) scale(0.94);
    transition: opacity 1.1s ease, transform 1.1s cubic-bezier(0.16,1,0.3,1), text-shadow 0.4s ease;
    will-change: transform, opacity;
  }
  .name.visible { opacity: 1; transform: translateY(0) scale(1); }
  .name.tap { animation: nameTap 0.6s ease; }
  @keyframes nameTap {
    0%   { transform: scale(1); }
    35%  { transform: scale(1.28); filter: drop-shadow(0 0 8px currentColor); }
    100% { transform: scale(1); }
  }
  .name.selected {
    opacity: 1;
    transform: translateY(0) scale(1.08);
    text-shadow: 0 0 12px currentColor;
  }

  .names-hint {
    font-family: 'EmptyStackFont', serif;
    font-size: 0.66rem;
    color: rgba(255,255,255,0.16);
    letter-spacing: 0.16em;
    margin-top: 24px;
    opacity: 0;
    transition: opacity 1.6s ease;
  }
  .names-hint.visible { opacity: 1; }
  .names-hint.dim { opacity: 0 !important; }

  .msg-card {
    margin: 22px auto 0;
    max-width: 340px;
    border: 1px solid rgba(255,255,255,0.10);
    border-radius: 16px;
    background: rgba(255,255,255,0.025);
    padding: 0 24px;
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    transform: translateY(14px);
    pointer-events: none;
    transition: opacity 0.55s ease,
                transform 0.6s cubic-bezier(0.16,1,0.3,1),
                max-height 0.6s cubic-bezier(0.16,1,0.3,1),
                padding 0.5s ease;
  }
  .msg-card.open {
    opacity: 1;
    transform: translateY(0);
    max-height: 460px;
    padding: 20px 24px 22px;
    pointer-events: auto;
  }
  .msg-card.switching {
    opacity: 0;
    transform: translateY(6px);
    transition: opacity 0.28s ease, transform 0.28s ease;
  }
  .msg-card-name {
    display: block;
    font-family: 'EmptyStackSttFont', "Noto Serif SC", serif;
    font-size: 0.9rem;
    letter-spacing: 0.06em;
    margin-bottom: 12px;
    opacity: 0.9;
  }
  .msg-card-text {
    font-family: 'EmptyStackSttFont', "Noto Serif SC", serif;
    font-size: 0.92rem;
    line-height: 2;
    color: rgba(255,255,255,0.5);
    letter-spacing: 0.04em;
    min-height: 1em;
    white-space: pre-wrap;
  }
  .msg-card-text::after {
    content: '｜';
    margin-left: 1px;
    animation: caretBlink 1s step-end infinite;
  }
  .msg-card-text.done::after { content: ''; animation: none; }
  @keyframes caretBlink { 0%,100%{opacity:0.5;} 50%{opacity:0;} }

  .ending {
    text-align: center;
    margin-top: 56px;
    color: rgba(255,255,255,0.15);
    font-size: 0.75rem;
    letter-spacing: 0.08em;
    line-height: 2;
    opacity: 0;
    transform: translateY(8px);
    transition: opacity 2.2s ease, transform 1.8s ease;
  }
  .ending.visible { opacity: 1; transform: translateY(0); }

  .download-section {
    text-align: center;
    margin-top: 48px;
    opacity: 0;
    transform: translateY(8px);
    transition: opacity 2.2s ease, transform 1.8s ease;
  }
  .download-section.visible { opacity: 1; transform: translateY(0); }

  .download-desc {
    font-family: 'EmptyStackFont', serif;
    font-size: 0.72rem;
    color: rgba(255,255,255,0.18);
    letter-spacing: 0.08em;
    margin-bottom: 18px;
  }

  .download-btn {
    display: inline-block;
    background: transparent;
    border: 1px solid rgba(255,255,255,0.12);
    color: rgba(255,255,255,0.35);
    font-family: 'EmptyStackFont', serif;
    font-size: 0.82rem;
    letter-spacing: 0.14em;
    padding: 10px 32px 10px 34px;
    border-radius: 24px;
    text-decoration: none;
    cursor: pointer;
    outline: none;
    -webkit-appearance: none;
    appearance: none;
    -webkit-tap-highlight-color: transparent;
    transition: color 0.4s, border-color 0.4s, transform 0.3s;
  }
  .download-btn:active {
    color: rgba(255,255,255,0.55);
    border-color: rgba(255,255,255,0.28);
    transform: scale(0.95);
  }

  /* ── 心率数据 ── */
  .heart-section {
    text-align: center;
    margin-top: 54px;
    opacity: 0;
    transform: translateY(8px);
    transition: opacity 2.2s ease, transform 1.8s ease;
  }
  .heart-section.visible { opacity: 1; transform: translateY(0); }

  .heart-btn {
    display: inline-block;
    background: transparent;
    border: 1px solid rgba(255,255,255,0.1);
    color: rgba(255,255,255,0.3);
    font-family: 'EmptyStackFont', serif;
    font-size: 0.78rem;
    letter-spacing: 0.14em;
    padding: 9px 30px 9px 32px;
    border-radius: 22px;
    cursor: pointer;
    outline: none;
    -webkit-appearance: none;
    appearance: none;
    transition: color 0.4s, border-color 0.4s, transform 0.3s;
  }
  .heart-btn:active {
    color: rgba(255,255,255,0.6);
    border-color: rgba(179,38,30,0.5);
    transform: scale(0.95);
  }
  .heart-btn.loading {
    color: rgba(255,255,255,0.15);
    pointer-events: none;
  }

  .heart-display {
    max-width: 480px;
    margin: 20px auto 0;
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    transform: translateY(10px);
    pointer-events: none;
    transition: opacity 0.55s ease,
                transform 0.6s cubic-bezier(0.16,1,0.3,1),
                max-height 0.6s cubic-bezier(0.16,1,0.3,1);
  }
  .heart-display.open {
    opacity: 1;
    transform: translateY(0);
    max-height: 600px;
    pointer-events: auto;
  }

  .heart-time {
    font-family: 'EmptyStackFont', serif;
    font-size: 0.68rem;
    color: rgba(255,255,255,0.22);
    letter-spacing: 0.1em;
    margin-bottom: 14px;
  }

  .heart-stats {
    display: flex;
    justify-content: center;
    gap: 24px;
    margin-bottom: 18px;
    font-family: 'EmptyStackFont', serif;
  }
  .heart-stat {
    text-align: center;
  }
  .heart-stat .val {
    font-size: 1.5rem;
    font-weight: 300;
    color: rgba(179,38,30,0.7);
    letter-spacing: 0.04em;
  }
  .heart-stat .lbl {
    font-size: 0.66rem;
    color: rgba(255,255,255,0.2);
    letter-spacing: 0.08em;
    margin-top: 4px;
  }

  .heart-chart-wrap {
    width: 100%;
    height: 200px;
    border-radius: 12px;
    background: rgba(255,255,255,0.015);
    border: 1px solid rgba(255,255,255,0.05);
    overflow: hidden;
  }

  .heart-msg {
    font-family: 'EmptyStackFont', serif;
    font-size: 0.72rem;
    color: rgba(255,255,255,0.2);
    letter-spacing: 0.06em;
    padding: 20px 0;
  }

  .heart-detail-link {
    display: block;
    width: 100%;
    text-align: right;
    margin-top: 10px;
    background: transparent;
    border: none;
    font-family: 'EmptyStackFont', serif;
    font-size: 0.68rem;
    color: rgba(255,255,255,0.22);
    letter-spacing: 0.08em;
    cursor: pointer;
    outline: none;
    -webkit-appearance: none;
    appearance: none;
    padding: 6px 0;
    transition: color 0.3s;
  }
  .heart-detail-link:active {
    color: rgba(255,255,255,0.5);
  }

  @media (max-width: 480px) {
    .lyric-col  { font-size: 0.72rem; }
    .lyric-trans { font-size: 0.66rem; }
  }
  @media (min-width: 768px) {
    .container { max-width: 640px; }
    .counter-block { margin-bottom: 72px; }
    .main-text { font-size: 1.04rem; line-height: 2.3; margin-bottom: 52px; }
    .letter-img img { max-width: 55%; }
    .thanks-phrase { font-size: 1.15rem; }
    .name { font-size: 1.05rem; padding: 4px 6px; }
    .divider { margin: 52px 0; }
    .lyric-col { font-size: 0.9rem; }
    .lyric-trans { font-size: 0.82rem; }
  }
  @media (min-width: 1024px) {
    .container { max-width: 720px; }
    body { padding-top: calc(env(safe-area-inset-top) + 80px); }
  }

  @media (prefers-reduced-motion: reduce) {
    body::before { animation: none; }
    .dust { display: none; }
    .counter-num.breathe { animation: none; }
    .msg-card-text::after { display: none; }
  }

  /* ── 心率全屏覆盖层 ── */
  .heart-overlay {
    position: fixed;
    inset: 0;
    z-index: 300;
    background: #08080c;
    display: flex;
    align-items: flex-start;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.4s ease;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    padding: calc(env(safe-area-inset-top) + 20px) 22px calc(env(safe-area-inset-bottom) + 40px);
  }
  .heart-overlay.open {
    opacity: 1;
    pointer-events: auto;
  }
  .heart-overlay-box {
    width: 100%;
    max-width: 640px;
    padding-bottom: 40px;
  }
  .heart-overlay-close {
    display: inline-block;
    background: transparent;
    border: 1px solid rgba(255,255,255,0.08);
    color: rgba(255,255,255,0.35);
    font-family: 'EmptyStackFont', serif;
    font-size: 0.72rem;
    letter-spacing: 0.1em;
    padding: 8px 18px;
    border-radius: 20px;
    cursor: pointer;
    outline: none;
    -webkit-appearance: none;
    appearance: none;
    margin-bottom: 24px;
    transition: color 0.3s, border-color 0.3s;
  }
  .heart-overlay-close:active {
    color: rgba(255,255,255,0.65);
    border-color: rgba(255,255,255,0.25);
  }
  .heart-overlay-time {
    font-family: 'EmptyStackFont', serif;
    font-size: 0.7rem;
    color: rgba(255,255,255,0.22);
    letter-spacing: 0.1em;
    margin-bottom: 18px;
    text-align: center;
  }
  .heart-overlay-stats {
    display: flex;
    justify-content: center;
    gap: 36px;
    margin-bottom: 24px;
    font-family: 'EmptyStackFont', serif;
  }
  .heart-overlay-stats .val {
    font-size: 1.8rem;
    font-weight: 300;
    color: rgba(179,38,30,0.75);
    letter-spacing: 0.04em;
  }
  .heart-overlay-stats .lbl {
    font-size: 0.66rem;
    color: rgba(255,255,255,0.2);
    letter-spacing: 0.08em;
    margin-top: 4px;
  }
  .heart-overlay-chart {
    width: 100%;
    height: 360px;
    border-radius: 14px;
    background: rgba(255,255,255,0.015);
    border: 1px solid rgba(255,255,255,0.05);
    margin-bottom: 20px;
    overflow: hidden;
  }
  .heart-overlay-count {
    text-align: center;
    font-size: 0.64rem;
    color: rgba(255,255,255,0.15);
    letter-spacing: 0.08em;
    margin-bottom: 18px;
  }
  .heart-overlay-table {
    width: 100%;
    border-collapse: collapse;
    table-layout: fixed;
    font-size: 0.68rem;
    font-family: 'EmptyStackFont', "Noto Serif SC", serif;
  }
  .heart-overlay-table th,
  .heart-overlay-table td {
    text-align: center;
    padding: 8px 6px;
    border-bottom: 1px solid rgba(255,255,255,0.04);
  }
  .heart-overlay-table th {
    color: rgba(255,255,255,0.18);
    font-weight: 400;
    font-size: 0.6rem;
    letter-spacing: 0.08em;
  }
  .heart-overlay-table td {
    color: rgba(255,255,255,0.35);
  }
  .heart-overlay-table .bpm-tag {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 6px;
    font-size: 0.68rem;
    letter-spacing: 0.04em;
  }
  .heart-overlay-table .bpm-lo { background: rgba(21,101,192,0.15); color: #64B5F6; }
  .heart-overlay-table .bpm-nm { background: rgba(46,125,50,0.15); color: #81C784; }
  .heart-overlay-table .bpm-hi { background: rgba(230,81,0,0.15); color: #FFB74D; }
  .heart-overlay-table .bpm-xh { background: rgba(198,40,40,0.15); color: #EF5350; }
  .heart-overlay-table .bpm-danger { background: rgba(198,40,40,0.25); color: #E57373; }
  .heart-overlay-table .bpm-death { background: rgba(255,255,255,0.04); color: rgba(255,255,255,0.25); }

  .bpm-tag.bpm-lo { background: rgba(21,101,192,0.15); color: #64B5F6; }
  .bpm-tag.bpm-nm { background: rgba(46,125,50,0.15); color: #81C784; }
  .bpm-tag.bpm-hi { background: rgba(230,81,0,0.15); color: #FFB74D; }
  .bpm-tag.bpm-xh { background: rgba(198,40,40,0.15); color: #EF5350; }
  .bpm-tag.bpm-danger { background: rgba(198,40,40,0.25); color: #E57373; }
  .bpm-tag.bpm-death { background: rgba(255,255,255,0.04); color: rgba(255,255,255,0.25); }

  /* ── 导出按钮 + 页脚 ── */
  .export-section {
    text-align: center;
    margin-top: 48px;
    opacity: 0;
    transform: translateY(8px);
    transition: opacity 2.2s ease, transform 1.8s ease;
  }
  .export-section.visible { opacity: 1; transform: translateY(0); }
  .export-btn {
    display: inline-block;
    background: transparent;
    border: 1px solid rgba(255,255,255,0.1);
    color: rgba(255,255,255,0.28);
    font-family: 'EmptyStackFont', serif;
    font-size: 0.76rem;
    letter-spacing: 0.14em;
    padding: 9px 28px;
    border-radius: 22px;
    cursor: pointer;
    outline: none;
    -webkit-appearance: none;
    appearance: none;
    transition: color 0.3s, border-color 0.3s, transform 0.3s;
  }
  .export-btn:active {
    color: rgba(255,255,255,0.55);
    border-color: rgba(255,255,255,0.25);
    transform: scale(0.95);
  }
  .export-btn.loading {
    opacity: 0.4;
    pointer-events: none;
  }

  .page-end {
    text-align: center;
    margin-top: 56px;
    color: rgba(255,255,255,0.1);
    font-family: 'EmptyStackFont', serif;
    font-size: 0.7rem;
    letter-spacing: 0.12em;
    opacity: 0;
    transform: translateY(8px);
    transition: opacity 2.2s ease, transform 1.8s ease;
  }
  .page-end.visible { opacity: 1; transform: translateY(0); }