:root {
  --bg-color: #fafdfb;
  --color-primary: #059669;       /* Deep Emerald */
  --color-primary-dark: #064e3b;  /* Pure Deep Green */
  --color-accent: #10b981;        /* Fresh Mint Green */
  --color-grid: rgba(16, 185, 129, 0.08);

  --text-main: #064e3b;
  --text-sub: #4b6358;
  --text-dim: #8ba298;

  --font-sans: 'Zen Kaku Gothic New', 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
}

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

html {
  font-family: var(--font-sans);
  background-color: var(--bg-color);
  color: var(--text-main);
  -webkit-font-smoothing: antialiased;
  -webkit-text-size-adjust: 100%;
}

body {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  align-items: center;
  min-height: 100vh;
  min-height: 100dvh; /* Dynamic viewport for modern mobile browsers */
  padding: 
    calc(1.5rem + env(safe-area-inset-top, 0px))
    calc(1.2rem + env(safe-area-inset-right, 0px))
    calc(1.5rem + env(safe-area-inset-bottom, 0px))
    calc(1.2rem + env(safe-area-inset-left, 0px));
  background: 
    radial-gradient(circle at 50% 20%, rgba(16, 185, 129, 0.07) 0%, transparent 60%),
    #fafdfb;
}

/* Minimal Top Bar */
.top-bar {
  width: 100%;
  max-width: 680px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.25rem 0;
}

.vital-dot-indicator {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-primary);
  letter-spacing: 0.04em;
  user-select: none;
}

.live-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background-color: var(--color-accent);
  box-shadow: 0 0 10px var(--color-accent);
  position: relative;
}

.live-dot::after {
  content: '';
  position: absolute;
  top: -4px;
  left: -4px;
  right: -4px;
  bottom: -4px;
  border: 1.5px solid var(--color-accent);
  border-radius: 50%;
  animation: dotPulse 2.2s cubic-bezier(0, 0.2, 0.8, 1) infinite;
}

@keyframes dotPulse {
  0% { transform: scale(0.6); opacity: 1; }
  100% { transform: scale(2.2); opacity: 0; }
}

.sound-btn {
  background: transparent;
  border: 1px solid rgba(16, 185, 129, 0.3);
  color: var(--text-sub);
  min-height: 38px;
  padding: 0.45rem 1rem;
  border-radius: 9999px;
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  transition: all 0.2s ease;
  touch-action: manipulation;
  user-select: none;
}

.sound-btn:hover {
  background: rgba(16, 185, 129, 0.08);
  border-color: var(--color-accent);
  color: var(--color-primary-dark);
}

.sound-btn.active {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #ffffff;
  box-shadow: 0 4px 12px rgba(5, 150, 105, 0.2);
}

/* Center Content: ECG Monitor */
.main-stage {
  width: 100%;
  max-width: 680px;
  margin: auto 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 1rem 0;
}

.ecg-frame {
  width: 100%;
  height: clamp(130px, 24vh, 180px);
  background: #ffffff;
  border: 1px solid rgba(16, 185, 129, 0.18);
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 10px 30px rgba(5, 150, 105, 0.04);
  position: relative;
}

#ecgCanvas {
  width: 100%;
  height: 100%;
  display: block;
}

.bpm-subtle {
  margin-top: 0.85rem;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-dim);
  display: flex;
  align-items: center;
  gap: 0.4rem;
  user-select: none;
}

.heart-beat {
  color: var(--color-accent);
  display: inline-block;
  font-size: 0.95rem;
  animation: heartThump 0.83s ease-in-out infinite;
}

@keyframes heartThump {
  0%, 100% { transform: scale(1); }
  14% { transform: scale(1.25); }
  28% { transform: scale(1); }
  42% { transform: scale(1.18); }
  70% { transform: scale(1); }
}

/* Bottom Message: "稲川元希は無事です。生きています。" */
.bottom-section {
  width: 100%;
  max-width: 680px;
  text-align: center;
  padding-bottom: 0.5rem;
}

.message-statement {
  font-size: clamp(1.45rem, 5.8vw, 2.4rem);
  font-weight: 800;
  color: var(--color-primary-dark);
  letter-spacing: -0.01em;
  line-height: 1.4;
  margin-bottom: 0.5rem;
  word-break: normal;
}

.message-statement .nowrap {
  display: inline-block;
}

.message-statement .name {
  color: var(--color-primary);
}

.live-time {
  font-family: var(--font-mono);
  font-size: clamp(0.75rem, 3vw, 0.85rem);
  color: var(--text-dim);
  letter-spacing: 0.02em;
}

/* Compact Mobile Devices (e.g., iPhone SE, narrow portrait screens) */
@media (max-width: 480px) {
  body {
    padding-top: calc(1rem + env(safe-area-inset-top, 0px));
    padding-bottom: calc(1rem + env(safe-area-inset-bottom, 0px));
    padding-left: calc(0.9rem + env(safe-area-inset-left, 0px));
    padding-right: calc(0.9rem + env(safe-area-inset-right, 0px));
  }
  .ecg-frame {
    border-radius: 12px;
  }
  .sound-btn {
    min-height: 36px;
    padding: 0.35rem 0.85rem;
    font-size: 0.78rem;
  }
}

/* Landscape Mode on Mobile */
@media (max-height: 500px) and (orientation: landscape) {
  body {
    justify-content: flex-start;
    gap: 0.75rem;
    padding-top: 0.5rem;
    padding-bottom: 0.5rem;
  }
  .main-stage {
    margin: 0;
  }
  .ecg-frame {
    height: 90px;
  }
  .bpm-subtle {
    margin-top: 0.3rem;
  }
  .message-statement {
    font-size: 1.3rem;
    margin-bottom: 0.2rem;
  }
}