/* ============================================================
   音之涟漪 · Ripples of Sound
   全局样式表
   ============================================================ */

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

:root {
  /* 主色板 — 清新水彩风 */
  --color-deep-teal: #0d3b3f;
  --color-teal: #1a5f63;
  --color-mint: #5fb8a8;
  --color-aqua: #7fdbca;
  --color-foam: #e0f5f0;
  --color-coral: #ff8b7e;
  --color-peach: #ffb997;
  --color-gold: #f2c14e;
  --color-lavender: #b8a9d9;
  --color-rose: #f4a6a6;

  /* 背景色 */
  --bg-gradient-start: #0a2a2e;
  --bg-gradient-mid: #134145;
  --bg-gradient-end: #1a5f63;

  /* 文字色 */
  --text-primary: #f0fffa;
  --text-secondary: #a8d8cf;
  --text-muted: #6ba89e;

  /* 玻璃面板 */
  --glass-bg: rgba(255, 255, 255, 0.06);
  --glass-border: rgba(255, 255, 255, 0.12);
  --glass-blur: 16px;

  /* 阴影 */
  --shadow-soft: 0 8px 32px rgba(0, 0, 0, 0.25);
  --shadow-glow: 0 0 24px rgba(127, 219, 202, 0.3);
  --shadow-card: 0 10px 30px rgba(0, 0, 0, 0.35);
  --shadow-card-hover: 0 22px 60px rgba(0, 0, 0, 0.45), 0 0 30px rgba(127, 219, 202, 0.18);

  /* 光效 */
  --glow-aqua: rgba(127, 219, 202, 0.55);
  --glow-aqua-soft: rgba(127, 219, 202, 0.22);
  --glow-gold: rgba(242, 193, 78, 0.5);
  --border-glow-aqua: rgba(127, 219, 202, 0.55);

  /* 字体 — 系统字体栈，简洁现代 */
  --font-display: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
  --font-body: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;

  /* 圆角 */
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;

  /* 动效缓动 */
  --ease-spring: cubic-bezier(0.34, 1.18, 0.5, 1);
  --ease-smooth: cubic-bezier(0.4, 0, 0.2, 1);
}

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  font-family: var(--font-body);
  background-color: var(--bg-gradient-start);
  background-image:
    radial-gradient(ellipse 60% 50% at 18% 0%, rgba(127, 219, 202, 0.14), transparent 60%),
    radial-gradient(ellipse 50% 45% at 88% 12%, rgba(184, 169, 217, 0.12), transparent 60%),
    radial-gradient(ellipse 80% 60% at 50% 115%, rgba(26, 95, 99, 0.55), transparent 60%),
    linear-gradient(155deg, var(--bg-gradient-start) 0%, var(--bg-gradient-mid) 55%, var(--bg-gradient-end) 100%);
  color: var(--text-primary);
  user-select: none;
  -webkit-user-select: none;
}

#gameCanvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  display: block;
}

/* ============================================================
   屏幕系统
   ============================================================ */
.screen {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 10;
  display: none;
  align-items: center;
  justify-content: center;
}

.screen--active {
  display: flex;
}

/* 游戏内 UI 不拦截点击（让点击穿透到 canvas） */
#gameUI.screen--active {
  pointer-events: none;
}

.screen--overlay {
  z-index: 20;
  background: rgba(10, 42, 46, 0.7);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

/* ============================================================
   菜单界面
   ============================================================ */
.menu__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
  padding: 28px 40px;
  max-width: 920px;
  width: 94%;
  max-height: 100vh;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

.menu__inner::-webkit-scrollbar {
  width: 4px;
}

.menu__inner::-webkit-scrollbar-track {
  background: transparent;
}

.menu__inner::-webkit-scrollbar-thumb {
  background: rgba(127, 219, 202, 0.2);
  border-radius: 2px;
}

.menu__title-wrap {
  text-align: center;
  margin-bottom: 4px;
  position: relative;
}

.menu__title-wrap::after {
  content: '';
  display: block;
  width: 72px;
  height: 2px;
  margin: 18px auto 0;
  border-radius: 2px;
  background: linear-gradient(90deg, transparent, var(--color-aqua), transparent);
  opacity: 0.65;
}

.menu__title {
  font-family: var(--font-display);
  font-size: 3.4rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  line-height: 1.1;
  background: linear-gradient(135deg, var(--color-foam) 0%, var(--color-aqua) 45%, var(--color-mint) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  filter: drop-shadow(0 2px 22px rgba(127, 219, 202, 0.35));
  animation: titlePulse 4s ease-in-out infinite;
}

.menu__subtitle {
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 500;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-top: 8px;
}

.menu__tagline {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-top: 14px;
  font-style: italic;
  opacity: 0.78;
  letter-spacing: 0.04em;
}

@keyframes titlePulse {
  0%, 100% { filter: drop-shadow(0 2px 22px rgba(127, 219, 202, 0.35)) brightness(1); }
  50% { filter: drop-shadow(0 2px 28px rgba(127, 219, 202, 0.5)) brightness(1.12); }
}

/* ---------- 上传卡片 ---------- */
.menu__upload-area {
  display: flex;
  gap: 16px;
  width: 100%;
  flex-wrap: wrap;
  justify-content: center;
}

.upload-card {
  flex: 1;
  min-width: 160px;
  max-width: 200px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 24px 16px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: transform 0.3s var(--ease-spring), background 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  position: relative;
  overflow: hidden;
}

.upload-card::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: radial-gradient(ellipse 80% 50% at 50% 0%, rgba(127, 219, 202, 0.16), transparent 70%);
  opacity: 0;
  transition: opacity 0.3s ease;
  pointer-events: none;
}

.upload-card:hover {
  background: rgba(127, 219, 202, 0.1);
  border-color: var(--border-glow-aqua);
  transform: translateY(-4px);
  box-shadow: 0 10px 30px rgba(127, 219, 202, 0.18);
}

.upload-card:hover::after {
  opacity: 1;
}

.upload-card--active {
  border-color: var(--color-aqua);
  background: rgba(127, 219, 202, 0.1);
  box-shadow: 0 0 0 1px var(--color-aqua), 0 0 22px rgba(127, 219, 202, 0.25);
}

/* ============================================================
   歌曲选择器 — 横向滚动选关
   ============================================================ */
.menu__song-picker {
  width: 100%;
  margin-bottom: 4px;
  margin-top: 4px;
}

.song-picker__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 14px;
  padding: 0 4px;
}

.song-picker__title {
  font-size: 0.82rem;
  font-weight: 600;
  color: rgba(168, 216, 207, 0.75);
  text-transform: uppercase;
  letter-spacing: 0.24em;
}

.song-picker__nav {
  display: flex;
  gap: 10px;
}

.song-picker__nav-btn {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.3s var(--ease-spring), background 0.25s ease, border-color 0.25s ease, color 0.25s ease, box-shadow 0.25s ease;
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
}

.song-picker__nav-btn:hover:not(:disabled) {
  background: rgba(127, 219, 202, 0.14);
  border-color: var(--border-glow-aqua);
  color: var(--color-aqua);
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(127, 219, 202, 0.22);
}

.song-picker__nav-btn:disabled {
  opacity: 0.28;
  cursor: not-allowed;
}

.song-picker__nav-btn svg {
  width: 18px;
  height: 18px;
}

.song-picker__scroll-wrap {
  width: 100%;
  overflow: hidden;
  position: relative;
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 5%, #000 95%, transparent);
  mask-image: linear-gradient(90deg, transparent, #000 5%, #000 95%, transparent);
}

.song-picker__grid {
  display: flex;
  gap: 18px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  scroll-behavior: smooth;
  padding: 6px 4px 14px;
  -webkit-overflow-scrolling: touch;
}

.song-picker__grid::-webkit-scrollbar {
  height: 4px;
}

.song-picker__grid::-webkit-scrollbar-track {
  background: rgba(168, 216, 207, 0.05);
  border-radius: 2px;
}

.song-picker__grid::-webkit-scrollbar-thumb {
  background: rgba(127, 219, 202, 0.3);
  border-radius: 2px;
}

.song-card {
  flex: 0 0 320px;
  scroll-snap-align: center;
  padding: 0;
  border-radius: var(--radius-lg);
  border: 1px solid rgba(168, 216, 207, 0.14);
  cursor: pointer;
  transition: transform 0.45s var(--ease-spring), border-color 0.4s ease, box-shadow 0.4s ease, opacity 0.4s ease;
  position: relative;
  overflow: hidden;
  min-height: 380px;
  box-shadow: var(--shadow-card);
  isolation: isolate;
}

/* 非选中卡片在滚动中微微缩小淡化，营造卷轴纵深 */
.song-card:not(.song-card--selected) {
  opacity: 0.72;
}

/* 悬浮：抬升 + 微缩放 + 发光 + 流光扫过 */
.song-card:hover {
  border-color: rgba(168, 216, 207, 0.38);
  transform: translateY(-7px) scale(1.02);
  opacity: 1;
  box-shadow: var(--shadow-card-hover);
}

.song-card::before {
  content: '';
  position: absolute;
  inset: 0;
  z-index: 3;
  background: linear-gradient(115deg, transparent 28%, rgba(255, 255, 255, 0.16) 47%, transparent 66%);
  background-size: 220% 100%;
  background-position: 130% 0;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.35s ease;
}

.song-card:hover::before {
  opacity: 1;
  animation: cardShine 1.5s ease;
}

@keyframes cardShine {
  0%   { background-position: 130% 0; }
  100% { background-position: -30% 0; }
}

/* 选中态：发光描边 + 内部光晕脉冲 + 强阴影 */
.song-card--selected {
  border-color: var(--color-aqua);
  transform: scale(1.06);
  opacity: 1;
  box-shadow: 0 0 0 2px var(--color-aqua),
              0 0 50px rgba(127, 219, 202, 0.48),
              0 24px 64px rgba(0, 0, 0, 0.48);
}

.song-card--selected::after {
  content: '';
  position: absolute;
  inset: 0;
  z-index: 1;
  background: radial-gradient(ellipse 80% 60% at 50% 32%, rgba(127, 219, 202, 0.2), transparent 72%);
  pointer-events: none;
  animation: cardGlowPulse 3s ease-in-out infinite;
}

@keyframes cardGlowPulse {
  0%, 100% { opacity: 0.55; }
  50%      { opacity: 1; }
}

/* 卡片主题渐变背景 */
.song-card__bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  transition: transform 0.6s ease, opacity 0.4s ease;
  box-shadow: inset 0 -70px 80px -24px rgba(0, 0, 0, 0.5),
              inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

.song-card:hover .song-card__bg {
  transform: scale(1.06);
}

.song-card--nature .song-card__bg {
  background:
    radial-gradient(ellipse 95% 55% at 30% 0%, rgba(127, 219, 202, 0.3), transparent 60%),
    linear-gradient(160deg, #0c3a2c 0%, #15543f 38%, #2d8a5e 72%, #4fa872 100%);
}

.song-card--amusement .song-card__bg {
  background:
    radial-gradient(ellipse 95% 55% at 30% 0%, rgba(255, 0, 110, 0.28), transparent 60%),
    linear-gradient(160deg, #1a0a2e 0%, #4a1063 30%, #8338ec 60%, #ff3d7f 100%);
}

.song-card--stellar .song-card__bg {
  background:
    radial-gradient(ellipse 95% 55% at 30% 0%, rgba(124, 77, 255, 0.32), transparent 60%),
    linear-gradient(160deg, #080a22 0%, #1a1040 25%, #3a2070 50%, #7c4dff 80%, #ffd54f 100%);
}

.song-card__content {
  position: relative;
  z-index: 2;
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  height: 100%;
  min-height: 380px;
}

.song-card__level {
  font-size: 0.7rem;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.6);
  text-transform: uppercase;
  letter-spacing: 0.26em;
  margin-bottom: auto;
}

.song-card__visual {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 10px 0 16px;
}

.song-card__visual-icon {
  width: 108px;
  height: 108px;
  opacity: 0.95;
  filter: drop-shadow(0 8px 24px rgba(0, 0, 0, 0.35));
  animation: iconFloat 4s ease-in-out infinite;
}

@keyframes iconFloat {
  0%, 100% { transform: translateY(0); }
  50%      { transform: translateY(-7px); }
}

.song-card__visual-icon svg {
  width: 100%;
  height: 100%;
}

.song-card__title {
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 800;
  color: #ffffff;
  text-shadow: 0 2px 16px rgba(0, 0, 0, 0.5);
  margin-bottom: 5px;
  letter-spacing: 0.02em;
}

.song-card__artist {
  font-size: 0.82rem;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.65);
  margin-bottom: 12px;
}

.song-card__theme-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.7rem;
  padding: 5px 14px;
  border-radius: 100px;
  font-weight: 600;
  margin-bottom: 12px;
  width: fit-content;
  letter-spacing: 0.08em;
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}

.song-card--nature .song-card__theme-tag {
  background: rgba(74, 157, 107, 0.28);
  color: #b6ecc4;
  border: 1px solid rgba(127, 219, 202, 0.35);
}

.song-card--amusement .song-card__theme-tag {
  background: rgba(255, 0, 110, 0.22);
  color: #ffb0d6;
  border: 1px solid rgba(255, 100, 160, 0.4);
}

.song-card--stellar .song-card__theme-tag {
  background: rgba(124, 77, 255, 0.26);
  color: #ccb6ff;
  border: 1px solid rgba(160, 130, 255, 0.45);
}

.song-card--arena .song-card__bg {
  background:
    radial-gradient(ellipse 90% 50% at 30% 0%, rgba(255, 107, 53, 0.3), transparent 60%),
    linear-gradient(160deg, #1a0606 0%, #2a0a05 20%, #4a1208 45%, #ff6b35 75%, #ffd54f 100%);
}

.song-card--arena .song-card__theme-tag {
  background: rgba(255, 107, 53, 0.25);
  color: #ffbb88;
  border: 1px solid rgba(255, 107, 53, 0.45);
}

.song-card__desc {
  font-size: 0.72rem;
  color: rgba(255, 255, 255, 0.48);
  letter-spacing: 0.5px;
  line-height: 1.55;
}

.upload-card__icon {
  width: 40px;
  height: 40px;
  color: var(--color-aqua);
  opacity: 0.8;
}

.upload-card__icon svg {
  width: 100%;
  height: 100%;
}

.upload-card__label {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-primary);
}

.upload-card__hint {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-align: center;
}

/* ---------- 歌曲信息 ---------- */
.menu__song-info {
  display: none;  /* 底部歌曲信息显示已移除 */
  text-align: center;
  padding: 14px 28px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.06);
}

.song-info__name {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: 0.02em;
}

.song-info__meta {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* ---------- 难度选择 ---------- */
.menu__difficulty {
  display: flex;
  gap: 12px;
}

.diff-btn {
  padding: 10px 30px;
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-secondary);
  background: transparent;
  border: 1.5px solid var(--glass-border);
  border-radius: 100px;
  cursor: pointer;
  transition: transform 0.25s var(--ease-spring), background 0.25s ease, border-color 0.25s ease, color 0.25s ease, box-shadow 0.25s ease;
}

.diff-btn:hover {
  border-color: var(--border-glow-aqua);
  color: var(--color-aqua);
  transform: translateY(-2px);
}

.diff-btn.active {
  background: rgba(127, 219, 202, 0.14);
  border-color: var(--color-aqua);
  color: var(--color-aqua);
  box-shadow: 0 0 0 1px var(--color-aqua), 0 0 18px rgba(127, 219, 202, 0.28);
  transform: translateY(-1px);
}

/* ---------- 开始按钮 ---------- */
.menu__start-btn {
  display: none;  /* 开始行走按钮已移除，改为点击关卡卡片直接进入游戏 */
  position: relative;
  padding: 18px 72px;
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--color-deep-teal);
  background: linear-gradient(135deg, var(--color-aqua), var(--color-mint));
  border: none;
  border-radius: 100px;
  cursor: pointer;
  transition: transform 0.3s var(--ease-spring), box-shadow 0.3s ease, filter 0.3s ease;
  box-shadow: 0 8px 32px rgba(127, 219, 202, 0.38), inset 0 1px 0 rgba(255, 255, 255, 0.4);
  overflow: hidden;
  isolation: isolate;
}

.menu__start-btn::before {
  content: '';
  position: absolute;
  inset: 0;
  z-index: -1;
  background: linear-gradient(115deg, transparent 30%, rgba(255, 255, 255, 0.5) 48%, transparent 66%);
  background-size: 220% 100%;
  background-position: 130% 0;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.menu__start-btn:hover:not(:disabled) {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 12px 40px rgba(127, 219, 202, 0.5), inset 0 1px 0 rgba(255, 255, 255, 0.4);
  filter: brightness(1.06);
}

.menu__start-btn:hover:not(:disabled)::before {
  opacity: 1;
  animation: cardShine 1.4s ease;
}

.menu__start-btn:active:not(:disabled) {
  transform: translateY(-1px) scale(1.01);
}

.menu__start-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  filter: saturate(0.6);
}

/* ---------- 玩法提示 ---------- */
.menu__tips {
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-muted);
  line-height: 1.8;
  opacity: 0.7;
}

/* ============================================================
   头像选择
   ============================================================ */
.menu__avatar-select {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  width: 100%;
  padding: 20px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
}

.avatar-select__title {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  letter-spacing: 0.05em;
}

.avatar-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
}

.avatar-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 10px;
  border: 2px solid transparent;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.25s ease;
  background: rgba(255, 255, 255, 0.03);
}

.avatar-item:hover {
  border-color: rgba(127, 219, 202, 0.4);
  background: rgba(127, 219, 202, 0.08);
  transform: translateY(-2px);
}

.avatar-item--selected {
  border-color: var(--color-aqua);
  background: rgba(127, 219, 202, 0.12);
  box-shadow: 0 0 16px rgba(127, 219, 202, 0.3);
}

.avatar-item img {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  object-fit: cover;
}

.avatar-item__name {
  font-size: 0.7rem;
  color: var(--text-muted);
  text-align: center;
  max-width: 70px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.avatar-item--selected .avatar-item__name {
  color: var(--color-aqua);
}

/* ============================================================
   游戏内 HUD
   ============================================================ */
.hud {
  position: fixed;
  z-index: 15;
  pointer-events: none;
}

.hud--top-left {
  top: 24px;
  left: 24px;
}

.hud--top-right {
  top: 24px;
  right: 24px;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 6px;
}

.hud--top-center {
  top: 80px;
  left: 50%;
  transform: translateX(-50%);
}

.hud--bottom-center {
  bottom: 48px;
  left: 50%;
  transform: translateX(-50%);
  width: 80%;
  max-width: 600px;
  text-align: center;
}

.hud--bottom-left {
  bottom: 24px;
  left: 24px;
  width: 200px;
}

/* ---------- 进度条 ---------- */
.hud__progress {
  position: relative;
  width: 100%;
  height: 8px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 4px;
  overflow: hidden;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.hud__progress-bar {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--color-aqua), var(--color-mint));
  border-radius: 4px;
  transition: width 0.2s ease;
  box-shadow: 0 0 8px rgba(127, 219, 202, 0.4);
}

.hud__progress-text {
  position: absolute;
  right: -36px;
  top: -6px;
  font-size: 0.75rem;
  font-weight: 600;
  color: rgba(168, 216, 207, 0.7);
  white-space: nowrap;
}

/* ---------- 结算等级 ---------- */
.results__grade-wrap {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 16px 0;
}

.results__grade-label {
  font-size: 0.82rem;
  color: rgba(168, 216, 207, 0.6);
  letter-spacing: 0.1em;
}

.results__grade-value {
  font-family: var(--font-display);
  font-size: 2.8rem;
  font-weight: 800;
  color: var(--color-aqua);
  text-shadow: 0 0 24px rgba(127, 219, 202, 0.4);
}

.results__progress-text {
  font-size: 1rem;
  font-weight: 600;
  color: rgba(168, 216, 207, 0.5);
}

/* ---------- 分数 ---------- */
.hud__score {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 10px 18px;
  background: rgba(10, 42, 46, 0.32);
  border: 1px solid rgba(127, 219, 202, 0.18);
  border-radius: var(--radius-md);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.06);
}

.hud__label {
  font-size: 0.68rem;
  letter-spacing: 0.22em;
  color: var(--text-muted);
  text-transform: uppercase;
  font-weight: 600;
}

.hud__value {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 800;
  color: var(--text-primary);
  text-shadow: 0 0 14px rgba(127, 219, 202, 0.45);
  font-variant-numeric: tabular-nums;
  line-height: 1.1;
}

/* ---------- 连击 ---------- */
.hud__combo {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 2px;
  padding: 10px 18px;
  background: rgba(10, 42, 46, 0.32);
  border: 1px solid rgba(242, 193, 78, 0.22);
  border-radius: var(--radius-md);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.06);
  transition: opacity 0.3s ease, transform 0.3s ease;
}

.hud__combo--pop {
  animation: comboPop 0.4s ease;
}

@keyframes comboPop {
  0% { transform: scale(1); }
  40% { transform: scale(1.25); filter: drop-shadow(0 0 14px rgba(242, 193, 78, 0.6)); }
  100% { transform: scale(1); }
}

.hud__combo-num {
  font-family: var(--font-display);
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--color-gold);
  text-shadow: 0 0 18px rgba(242, 193, 78, 0.55);
  font-variant-numeric: tabular-nums;
  line-height: 1.1;
}

.hud__combo-label {
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  color: var(--text-muted);
  font-weight: 600;
}

/* ---------- 复活次数 ---------- */
.hud__revive {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  background: rgba(10, 42, 46, 0.32);
  border: 1px solid rgba(127, 219, 202, 0.22);
  border-radius: var(--radius-md);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  margin-bottom: 6px;
  transition: opacity 0.3s ease;
}

.hud__revive-label {
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  color: var(--text-muted);
  font-weight: 600;
}

.hud__revive-hearts {
  display: flex;
  gap: 4px;
}

.hud__revive-heart {
  width: 18px;
  height: 18px;
  position: relative;
  transition: all 0.3s ease;
}

.hud__revive-heart::before {
  content: '♥';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 16px;
  line-height: 1;
}

.hud__revive-heart--active::before {
  color: #7fdbca;
  text-shadow: 0 0 8px rgba(127, 219, 202, 0.6);
}

.hud__revive-heart--used::before {
  color: rgba(255, 255, 255, 0.12);
}

.hud__revive-heart--activate {
  animation: heartActivate 0.6s ease;
}

@keyframes heartActivate {
  0% { transform: translate(-50%, -50%) scale(1); }
  50% { transform: translate(-50%, -50%) scale(1.4); filter: drop-shadow(0 0 12px rgba(127, 219, 202, 0.8)); }
  100% { transform: translate(-50%, -50%) scale(1); }
}

/* ---------- 判定提示 ---------- */
.hud__judgment {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  opacity: 0;
  transition: opacity 0.2s ease;
}

.hud__judgment--show {
  animation: judgmentShow 0.8s ease forwards;
}

@keyframes judgmentShow {
  0% { opacity: 0; transform: translateY(10px) scale(0.8); }
  30% { opacity: 1; transform: translateY(0) scale(1.1); }
  70% { opacity: 1; transform: translateY(0) scale(1); }
  100% { opacity: 0; transform: translateY(-10px) scale(0.9); }
}

.judgment-perfect { color: var(--color-gold); text-shadow: 0 0 20px rgba(242, 193, 78, 0.6); }
.judgment-good { color: var(--color-aqua); text-shadow: 0 0 20px rgba(127, 219, 202, 0.6); }
.judgment-ok { color: var(--color-lavender); text-shadow: 0 0 20px rgba(184, 169, 217, 0.5); }
.judgment-miss { color: var(--color-rose); text-shadow: 0 0 20px rgba(244, 166, 166, 0.5); }

/* ---------- 按键提示 ---------- */
.hud__key-hints {
  font-family: var(--font-display);
  font-size: 0.7rem;
  letter-spacing: 0.3em;
  color: var(--text-muted);
  margin-bottom: 8px;
  opacity: 0.5;
}

/* ---------- 转弯提示 ---------- */
.turn-hint {
  font-family: var(--font-display);
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  color: var(--text-muted);
  margin-bottom: 8px;
  opacity: 0.4;
  text-align: center;
  transition: opacity 0.15s ease;
}

.turn-hint--flash {
  animation: turnHintFlash 0.3s ease;
}

@keyframes turnHintFlash {
  0% { opacity: 0.4; transform: scale(1); }
  50% { opacity: 0.9; transform: scale(1.1); color: var(--color-aqua); }
  100% { opacity: 0.4; transform: scale(1); }
}

/* ---------- 歌词显示 ---------- */
.hud__lyrics {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}

.lyrics__line {
  font-size: 1rem;
  line-height: 1.6;
  transition: all 0.5s ease;
  text-align: center;
}

.lyrics__line--prev {
  font-size: 0.85rem;
  color: var(--text-muted);
  opacity: 0.4;
}

.lyrics__line--current {
  font-size: 1.2rem;
  font-weight: 500;
  color: var(--text-primary);
  text-shadow: 0 0 16px rgba(127, 219, 202, 0.3);
  opacity: 1;
}

.lyrics__line--next {
  font-size: 0.85rem;
  color: var(--text-muted);
  opacity: 0.5;
}

/* ---------- 暂停按钮 ---------- */
.hud__pause {
  position: fixed;
  top: 24px;
  left: 50%;
  transform: translateX(-50%);
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 50%;
  cursor: pointer;
  z-index: 16;
  pointer-events: auto;
  color: var(--text-secondary);
  transition: all 0.2s ease;
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
}

.hud__pause:hover {
  background: rgba(127, 219, 202, 0.12);
  color: var(--color-aqua);
}

.hud__pause svg {
  width: 18px;
  height: 18px;
}

/* ============================================================
   准备开始界面
   ============================================================ */
.ready__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  padding: 48px 56px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  animation: readyFadeIn 0.5s var(--ease-out-back);
}

@keyframes readyFadeIn {
  from {
    opacity: 0;
    transform: translateY(20px) scale(0.95);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.ready__song-title {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--color-aqua), var(--color-lavender));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: -4px;
}

.ready__artist {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-bottom: 12px;
}

.ready__hint {
  font-size: 1.1rem;
  color: var(--text-primary);
  font-weight: 500;
}

.ready__btn {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 56px;
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--color-deep-teal);
  background: linear-gradient(135deg, var(--color-aqua), var(--color-mint));
  border: none;
  border-radius: 100px;
  cursor: pointer;
  transition: transform 0.3s var(--ease-spring), box-shadow 0.3s ease, filter 0.3s ease;
  box-shadow: 0 8px 28px rgba(127, 219, 202, 0.35), inset 0 1px 0 rgba(255, 255, 255, 0.4);
  margin-top: 4px;
  animation: readyBtnPulse 2s ease-in-out infinite;
}

@keyframes readyBtnPulse {
  0%, 100% {
    box-shadow: 0 8px 28px rgba(127, 219, 202, 0.35), inset 0 1px 0 rgba(255, 255, 255, 0.4);
  }
  50% {
    box-shadow: 0 8px 36px rgba(127, 219, 202, 0.5), inset 0 1px 0 rgba(255, 255, 255, 0.4);
  }
}

.ready__btn:hover {
  transform: translateY(-3px) scale(1.04);
  box-shadow: 0 12px 36px rgba(127, 219, 202, 0.45), inset 0 1px 0 rgba(255, 255, 255, 0.45);
  filter: brightness(1.08);
}

.ready__btn svg {
  width: 24px;
  height: 24px;
}

.ready__sub-hint {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* ============================================================
   暂停界面
   ============================================================ */
.pause__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  padding: 48px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
}

.pause__title {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.pause__btn {
  padding: 12px 48px;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--color-deep-teal);
  background: linear-gradient(135deg, var(--color-aqua), var(--color-mint));
  border: none;
  border-radius: 100px;
  cursor: pointer;
  transition: transform 0.3s var(--ease-spring), box-shadow 0.3s ease, filter 0.3s ease, background 0.3s ease, color 0.3s ease, border-color 0.3s ease;
  box-shadow: 0 6px 22px rgba(127, 219, 202, 0.3), inset 0 1px 0 rgba(255, 255, 255, 0.35);
}

.pause__btn:hover {
  transform: translateY(-2px) scale(1.02);
  box-shadow: 0 10px 30px rgba(127, 219, 202, 0.42), inset 0 1px 0 rgba(255, 255, 255, 0.4);
  filter: brightness(1.06);
}

.pause__btn--secondary {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--glass-border);
  box-shadow: none;
}

.pause__btn--secondary:hover {
  border-color: var(--border-glow-aqua);
  color: var(--color-aqua);
  background: rgba(127, 219, 202, 0.08);
  filter: none;
}

/* ============================================================
   复活弹窗
   ============================================================ */
.revive-overlay {
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 100;
  animation: fadeIn 0.3s ease;
}

.revive-card {
  background: linear-gradient(145deg, rgba(20, 45, 50, 0.95), rgba(10, 30, 35, 0.95));
  border: 1px solid rgba(127, 219, 202, 0.3);
  border-radius: 20px;
  padding: 40px 36px;
  text-align: center;
  max-width: 360px;
  width: 90%;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5), 0 0 40px rgba(127, 219, 202, 0.15);
  animation: reviveCardIn 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

@keyframes reviveCardIn {
  from { transform: scale(0.7) translateY(20px); opacity: 0; }
  to { transform: scale(1) translateY(0); opacity: 1; }
}

.revive-card__icon {
  font-size: 3rem;
  color: #7fdbca;
  text-shadow: 0 0 20px rgba(127, 219, 202, 0.6);
  margin-bottom: 8px;
  animation: heartBeat 1.2s ease-in-out infinite;
}

@keyframes heartBeat {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.15); }
}

.revive-card__title {
  font-size: 1.4rem;
  font-weight: 700;
  color: #e8f5f3;
  margin-bottom: 6px;
}

.revive-card__desc {
  font-size: 0.85rem;
  color: rgba(232, 245, 243, 0.6);
  margin-bottom: 16px;
}

.revive-card__hearts {
  display: flex;
  justify-content: center;
  gap: 6px;
  margin-bottom: 20px;
}

.revive-card__heart {
  width: 22px;
  height: 22px;
  position: relative;
}

.revive-card__heart::before {
  content: '♥';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 20px;
}

.revive-card__heart--active::before {
  color: #7fdbca;
  text-shadow: 0 0 10px rgba(127, 219, 202, 0.5);
}

.revive-card__heart--used::before {
  color: rgba(255, 255, 255, 0.15);
}

.revive-card__timer {
  position: relative;
  width: 100%;
  height: 36px;
  background: rgba(0, 0, 0, 0.3);
  border-radius: 18px;
  overflow: hidden;
  margin-bottom: 24px;
}

.revive-card__timer-bar {
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  width: 100%;
  background: linear-gradient(90deg, #7fdbca, #4dbfcc);
  border-radius: 18px;
  transition: width 0.1s linear;
}

.revive-card__timer-text {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 1.1rem;
  font-weight: 700;
  color: #fff;
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.5);
  z-index: 1;
}

.revive-card__btns {
  display: flex;
  gap: 12px;
}

.revive-card__btn {
  flex: 1;
  padding: 14px 20px;
  border: none;
  border-radius: 12px;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.2s ease;
  font-family: inherit;
}

.revive-card__btn--revive {
  background: linear-gradient(135deg, #7fdbca, #4dbfcc);
  color: #0a2530;
  box-shadow: 0 4px 16px rgba(127, 219, 202, 0.3);
}

.revive-card__btn--revive:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(127, 219, 202, 0.45);
}

.revive-card__btn--decline {
  background: rgba(255, 255, 255, 0.08);
  color: rgba(232, 245, 243, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.revive-card__btn--decline:hover {
  background: rgba(255, 255, 255, 0.12);
  color: rgba(232, 245, 243, 0.8);
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* ============================================================
   结算界面
   ============================================================ */
.results__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
  padding: 44px 48px;
  max-width: 500px;
  width: 90%;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  box-shadow: var(--shadow-soft), inset 0 1px 0 rgba(255, 255, 255, 0.06);
}

.results__title {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  background: linear-gradient(135deg, var(--color-foam), var(--color-aqua));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  filter: drop-shadow(0 2px 14px rgba(127, 219, 202, 0.3));
}

.results__score-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}

.results__score-label {
  font-size: 0.78rem;
  letter-spacing: 0.22em;
  color: var(--text-muted);
  text-transform: uppercase;
  font-weight: 600;
}

.results__score-value {
  font-family: var(--font-display);
  font-size: 3.6rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--color-gold), var(--color-peach));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  filter: drop-shadow(0 0 28px rgba(242, 193, 78, 0.35));
  font-variant-numeric: tabular-nums;
  line-height: 1.1;
}

.results__stats {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  justify-content: center;
}

.results__stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 12px 18px;
  min-width: 92px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-md);
}

.results__stat-num {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  font-variant-numeric: tabular-nums;
}

.results__stat-label {
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--text-muted);
}

.results__rank {
  font-family: var(--font-display);
  font-size: 3.4rem;
  font-weight: 800;
  min-height: 80px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.results__rank::after {
  content: '';
  position: absolute;
  width: 130px;
  height: 130px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.12), transparent 66%);
  z-index: -1;
}

.results__btn {
  padding: 14px 46px;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--color-deep-teal);
  background: linear-gradient(135deg, var(--color-aqua), var(--color-mint));
  border: none;
  border-radius: 100px;
  cursor: pointer;
  transition: transform 0.3s var(--ease-spring), box-shadow 0.3s ease, filter 0.3s ease, background 0.3s ease, color 0.3s ease, border-color 0.3s ease;
  box-shadow: 0 6px 22px rgba(127, 219, 202, 0.3), inset 0 1px 0 rgba(255, 255, 255, 0.35);
}

.results__btn:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 12px 36px rgba(127, 219, 202, 0.45), inset 0 1px 0 rgba(255, 255, 255, 0.4);
  filter: brightness(1.06);
}

.results__btn--secondary {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--glass-border);
  box-shadow: none;
}

.results__btn--secondary:hover {
  border-color: var(--border-glow-aqua);
  color: var(--color-aqua);
  background: rgba(127, 219, 202, 0.08);
  filter: none;
}

/* ============================================================
   加载层
   ============================================================ */
.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 100;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  background: rgba(10, 42, 46, 0.85);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.loading-overlay__spinner {
  width: 48px;
  height: 48px;
  border: 3px solid rgba(127, 219, 202, 0.2);
  border-top-color: var(--color-aqua);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

.loading-overlay__text {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 760px) {
  .menu__title { font-size: 2.8rem; }
  .menu__inner { padding: 24px 20px; gap: 22px; }
  .menu__upload-area { flex-direction: column; align-items: stretch; }
  .upload-card { max-width: 100%; }
  .results__inner { padding: 36px 28px; }
}

@media (max-width: 600px) {
  .menu__title { font-size: 2.4rem; }
  .menu__inner { padding: 20px 14px; gap: 20px; }
  .song-card { flex: 0 0 248px; min-height: 300px; }
  .song-card__content { min-height: 300px; padding: 22px 18px; }
  .song-card__visual-icon { width: 80px; height: 80px; }
  .song-card__title { font-size: 1.25rem; }
  .hud--top-left { top: 14px; left: 14px; }
  .hud--top-right { top: 14px; right: 14px; }
  .hud__score, .hud__combo { padding: 8px 14px; }
  .hud__revive { padding: 6px 10px; }
  .hud__revive-heart { width: 14px; height: 14px; }
  .hud__revive-heart::before { font-size: 13px; }
  .hud__value { font-size: 1.6rem; }
  .hud__combo-num { font-size: 1.8rem; }
  .results__stats { gap: 10px; }
  .results__stat { padding: 10px 14px; min-width: 84px; }
  .results__score-value { font-size: 3rem; }
  .results__rank { font-size: 3rem; min-height: 64px; }
  .results__rank::after { width: 104px; height: 104px; }
}