/* ==========================================================================
   Countdown 毕业 · Ultra-Fast Apple Design System Stylesheet
   Engineered for 120 FPS Rendering & Instant Zero-Lag Loading
   ========================================================================== */

/* Design Tokens */
:root {
  --bg-primary: #000000;
  --bg-surface: rgba(22, 22, 26, 0.75);
  --bg-surface-hover: rgba(30, 30, 36, 0.85);
  --card-border: rgba(255, 255, 255, 0.08);
  --card-border-hover: rgba(255, 255, 255, 0.18);
  --card-shadow: 0 16px 36px -10px rgba(0, 0, 0, 0.6);

  --text-primary: #f5f5f7;
  --text-secondary: rgba(245, 245, 247, 0.65);
  --text-tertiary: rgba(245, 245, 247, 0.4);

  --accent-blue: #2997ff;
  --accent-gold: #f5a623;
  --progress-track: rgba(255, 255, 255, 0.08);
  --progress-fill: linear-gradient(90deg, #2997ff 0%, #a855f7 60%, #f59e0b 100%);

  --font-family-apple: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", 
                       "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-pill: 9999px;

  --ease-apple: cubic-bezier(0.16, 1, 0.3, 1);
}

/* Light Theme */
body.light-theme {
  --bg-primary: #f5f5f7;
  --bg-surface: rgba(255, 255, 255, 0.82);
  --bg-surface-hover: rgba(255, 255, 255, 0.95);
  --card-border: rgba(0, 0, 0, 0.06);
  --card-border-hover: rgba(0, 0, 0, 0.14);
  --card-shadow: 0 12px 30px -8px rgba(0, 0, 0, 0.06);

  --text-primary: #1d1d1f;
  --text-secondary: rgba(29, 29, 31, 0.65);
  --text-tertiary: rgba(29, 29, 31, 0.42);

  --accent-blue: #0071e3;
  --accent-gold: #d97706;
  --progress-track: rgba(0, 0, 0, 0.06);
  --progress-fill: linear-gradient(90deg, #0071e3 0%, #9333ea 60%, #ea580c 100%);
}

/* Base Setup */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

html, body {
  width: 100%;
  min-height: 100%;
  font-family: var(--font-family-apple);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  overflow-x: hidden;
}

body {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  position: relative;
  contain: paint;
}

/* Tabular Numbers */
.digit-value,
.metric-num,
.format-string,
.progress-percent {
  font-variant-numeric: tabular-nums;
  font-feature-settings: "tnum" 1;
}

/* Hardware-Accelerated Ambient Mesh (Zero CPU/GPU Filter Load) */
.ambient-layer {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
  contain: strict;
}

.light-mesh {
  position: absolute;
  inset: 0;
  background-image: 
    radial-gradient(circle at 18% 18%, rgba(88, 86, 214, 0.18) 0%, transparent 45%),
    radial-gradient(circle at 82% 82%, rgba(245, 166, 35, 0.12) 0%, transparent 45%),
    radial-gradient(circle at 50% 50%, rgba(41, 151, 255, 0.08) 0%, transparent 55%);
  transform: translate3d(0, 0, 0);
}

body.light-theme .light-mesh {
  background-image: 
    radial-gradient(circle at 20% 20%, rgba(0, 113, 227, 0.09) 0%, transparent 50%),
    radial-gradient(circle at 80% 80%, rgba(245, 166, 35, 0.08) 0%, transparent 50%);
}

.interactive-glow {
  position: absolute;
  width: 320px;
  height: 320px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(41, 151, 255, 0.12) 0%, transparent 65%);
  pointer-events: none;
  opacity: 0;
  will-change: transform;
  transform: translate3d(-50%, -50%, 0);
  transition: opacity 0.2s ease;
}

body.dark-theme .interactive-glow {
  opacity: 1;
}

/* Page Layout */
.page-container {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 960px;
  min-height: 100vh;
  margin: 0 auto;
  padding: 24px 20px 28px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

/* Top Navigation */
.top-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  margin-bottom: 20px;
}

/* Background YouTube Player (Active in DOM so browser doesn't throttle) */
.yt-hidden-player {
  position: fixed;
  bottom: 0;
  right: 0;
  width: 2px;
  height: 2px;
  opacity: 0.001;
  pointer-events: none;
  z-index: -9999;
  overflow: hidden;
}

/* Apple Music Player Pill (Replaced old badge-pill) */
/* Background Music Indicator (Always Active & Looping) */
.music-pill {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 7px 16px;
  background: rgba(41, 151, 255, 0.09);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(41, 151, 255, 0.35);
  border-radius: var(--radius-pill);
  color: var(--text-primary);
  user-select: none;
  cursor: default;
}

body.light-theme .music-pill {
  background: rgba(0, 113, 227, 0.08);
  border-color: rgba(0, 113, 227, 0.3);
}

.music-icon-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 14px;
  height: 14px;
}

.music-bars {
  display: flex;
  align-items: flex-end;
  gap: 2.5px;
  height: 12px;
  width: 12px;
}

.music-bars .bar {
  width: 2px;
  background-color: var(--accent-blue);
  border-radius: 1px;
  height: 3px;
}

.music-bars .bar-1 {
  animation: eqWave 0.8s ease-in-out infinite alternate;
}
.music-bars .bar-2 {
  animation: eqWave 0.6s ease-in-out 0.25s infinite alternate;
}
.music-bars .bar-3 {
  animation: eqWave 0.9s ease-in-out 0.45s infinite alternate;
}

@keyframes eqWave {
  0% { height: 3px; }
  100% { height: 12px; }
}

.music-text {
  font-size: 13px;
  font-weight: 500;
  letter-spacing: -0.01em;
}

.nav-controls {
  display: flex;
  align-items: center;
  gap: 8px;
}

.icon-btn {
  width: 38px;
  height: 38px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-surface);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--card-border);
  border-radius: 50%;
  color: var(--text-secondary);
  cursor: pointer;
  transition: transform 120ms var(--ease-apple), background-color 120ms ease, border-color 120ms ease;
  outline: none;
}

.icon-btn:hover {
  color: var(--text-primary);
  border-color: var(--card-border-hover);
  background: var(--bg-surface-hover);
  transform: translateY(-1px);
}

.icon-btn:active {
  transform: scale(0.93);
}

.icon-btn .icon {
  width: 17px;
  height: 17px;
}

.hidden {
  display: none !important;
}

/* Content Area */
.content-wrapper {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 100%;
  max-width: 860px;
  margin: 0 auto;
  gap: 32px;
}

/* Hero Section */
.hero-section {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}

.subtitle-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 14px;
  background: var(--bg-surface);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-pill);
  font-size: 13px;
  color: var(--text-secondary);
}

.cap-emoji {
  font-size: 15px;
}

.target-date-label {
  font-weight: 500;
  letter-spacing: -0.01em;
}

.main-title {
  font-size: clamp(34px, 5.5vw, 52px);
  font-weight: 700;
  letter-spacing: -0.035em;
  line-height: 1.15;
  color: var(--text-primary);
}

.tagline {
  font-size: clamp(14px, 1.8vw, 16px);
  color: var(--text-secondary);
  font-weight: 400;
  letter-spacing: -0.01em;
}

/* Countdown Clock Display Cards */
.countdown-stage {
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
}

.clock-grid {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  width: 100%;
}

.unit-card {
  position: relative;
  flex: 1;
  max-width: 150px;
  min-width: 74px;
  background: var(--bg-surface);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--card-border);
  box-shadow: var(--card-shadow);
  border-radius: var(--radius-lg);
  padding: 22px 10px 16px;
  text-align: center;
  transition: transform 160ms var(--ease-apple), border-color 160ms ease;
  user-select: none;
  contain: content;
}

.unit-card:hover {
  transform: translateY(-3px);
  border-color: var(--card-border-hover);
}

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

.digit-box {
  display: flex;
  align-items: center;
  justify-content: center;
  height: clamp(48px, 7vw, 70px);
  overflow: hidden;
}

.digit-value {
  font-size: clamp(38px, 6.4vw, 64px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  display: inline-block;
  will-change: transform;
}

/* Snappy Tick Animation (Fast 180ms response) */
.digit-tick {
  animation: snappyTick 180ms var(--ease-apple) forwards;
}

@keyframes snappyTick {
  0% {
    transform: translateY(-20%) scale(0.96);
    opacity: 0.5;
  }
  100% {
    transform: translateY(0) scale(1);
    opacity: 1;
  }
}

.unit-label {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--text-secondary);
}

.time-separator {
  font-size: clamp(24px, 4vw, 42px);
  font-weight: 300;
  color: var(--text-tertiary);
  margin-top: -20px;
  user-select: none;
}

/* Exact Format Pill: dd日,hh小时,mm分,ss秒 */
.format-pill-wrapper {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.format-pill {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 8px 18px;
  background: var(--bg-surface);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-pill);
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.12);
  cursor: pointer;
  transition: transform 120ms var(--ease-apple), border-color 120ms ease, background-color 120ms ease;
  outline: none;
}

.format-pill:hover {
  border-color: var(--card-border-hover);
  background: var(--bg-surface-hover);
  transform: translateY(-1px);
}

.format-pill:active {
  transform: scale(0.97);
}

.pill-indicator {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.05em;
  padding: 2px 7px;
  background: rgba(41, 151, 255, 0.12);
  color: var(--accent-blue);
  border-radius: var(--radius-pill);
}

.format-string {
  font-size: clamp(14px, 2vw, 16px);
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--text-primary);
}

.copy-hint {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 12px;
  color: var(--text-tertiary);
}

.format-pill:hover .copy-hint {
  color: var(--accent-blue);
}

.copy-icon {
  width: 14px;
  height: 14px;
}

.copied-toast {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translate3d(-50%, 6px, 0);
  padding: 5px 12px;
  font-size: 12px;
  font-weight: 500;
  border-radius: var(--radius-pill);
  background: var(--text-primary);
  color: var(--bg-primary);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.25);
  opacity: 0;
  pointer-events: none;
  transition: opacity 160ms ease, transform 160ms ease;
  white-space: nowrap;
  z-index: 10;
}

.copied-toast.show {
  opacity: 1;
  transform: translate3d(-50%, 10px, 0);
}

/* Time Metrics & Journey Bar */
.journey-dashboard {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.progress-container {
  width: 100%;
  background: var(--bg-surface);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--card-border);
  box-shadow: var(--card-shadow);
  border-radius: var(--radius-lg);
  padding: 18px 22px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.progress-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.progress-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
}

.progress-percent {
  font-size: 13px;
  font-weight: 700;
  color: var(--accent-blue);
}

.progress-track {
  width: 100%;
  height: 8px;
  background: var(--progress-track);
  border-radius: var(--radius-pill);
  overflow: hidden;
  position: relative;
}

.progress-fill {
  height: 100%;
  width: 0%;
  background: var(--progress-fill);
  border-radius: var(--radius-pill);
  transition: width 0.4s var(--ease-apple);
}

.progress-footer {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  color: var(--text-tertiary);
}

/* Metrics Grid */
.metrics-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  width: 100%;
}

.metric-card {
  background: var(--bg-surface);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--card-border);
  box-shadow: var(--card-shadow);
  border-radius: var(--radius-md);
  padding: 14px 10px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: 4px;
  transition: transform 120ms var(--ease-apple);
}

.metric-card:hover {
  transform: translateY(-2px);
}

.metric-num {
  font-size: clamp(16px, 2.2vw, 20px);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.metric-name {
  font-size: 11px;
  font-weight: 500;
  color: var(--text-secondary);
}

/* Footer */
.page-footer {
  width: 100%;
  text-align: center;
  padding-top: 18px;
}

.footer-note {
  font-size: 12px;
  color: var(--text-tertiary);
  letter-spacing: 0.01em;
}

/* Responsive */
@media (max-width: 680px) {
  .page-container {
    padding: 16px 12px 20px;
  }

  .content-wrapper {
    gap: 22px;
  }

  .clock-grid {
    gap: 6px;
  }

  .unit-card {
    padding: 16px 4px 12px;
    border-radius: var(--radius-md);
  }

  .unit-label {
    font-size: 11px;
  }

  .time-separator {
    margin-top: -14px;
    font-size: 20px;
  }

  .format-pill {
    padding: 7px 12px;
    gap: 8px;
  }

  .metrics-grid {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .metric-card {
    flex-direction: row;
    justify-content: space-between;
    padding: 10px 16px;
  }
}

@media (max-width: 360px) {
  .time-separator {
    display: none;
  }
  .digit-value {
    font-size: 28px;
  }
}

/* Prefers Reduced Motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
  }
  .digit-tick {
    animation: none !important;
  }
}