/* MIT Slow-Wave Pink Noise Player - Minimalist Luxury Night Theme */
:root {
  --bg-deep: #050811;
  --bg-card: #0b1122;
  --bg-card-hover: #111a33;
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-focus: rgba(216, 120, 255, 0.4);
  --text-main: #f0f4fc;
  --text-muted: #8b9bb4;
  --text-accent: #d4a373;
  --primary-purple: #ba68c8;
  --primary-glow: rgba(186, 104, 200, 0.35);
  --csf-blue: #38bdf8;
  --csf-glow: rgba(56, 189, 248, 0.3);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --font-serif: "Shippori Mincho", "Hiragino Mincho ProN", serif;
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Hiragino Sans", sans-serif;
}

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

body {
  background-color: var(--bg-deep);
  color: var(--text-main);
  font-family: var(--font-sans);
  line-height: 1.6;
  min-height: 100vh;
  padding: 24px 16px 60px;
  background-image: 
    radial-gradient(ellipse at 50% 0%, rgba(30, 41, 79, 0.3) 0%, transparent 70%),
    radial-gradient(circle at 85% 30%, rgba(186, 104, 200, 0.04) 0%, transparent 50%);
}

.container {
  max-width: 920px;
  margin: 0 auto;
}

/* ヘッダー */
header {
  text-align: center;
  margin-bottom: 28px;
}

.badge-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(186, 104, 200, 0.12);
  border: 1px solid rgba(186, 104, 200, 0.25);
  color: #e0aaff;
  font-size: 0.78rem;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: 999px;
  margin-bottom: 12px;
  letter-spacing: 0.05em;
}

h1 {
  font-family: var(--font-serif);
  font-size: 1.95rem;
  font-weight: 600;
  color: #ffffff;
  letter-spacing: 0.03em;
  margin-bottom: 8px;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.5);
}

.subtitle {
  color: var(--text-muted);
  font-size: 0.92rem;
  max-width: 680px;
  margin: 0 auto;
  line-height: 1.5;
}

/* メインビジュアライザーカード */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 20px;
  margin-bottom: 20px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
}

.visualizer-container {
  position: relative;
  width: 100%;
  height: 240px;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.06);
  background: #040711;
  margin-bottom: 16px;
}

#visualizer-canvas {
  width: 100%;
  height: 100%;
  display: block;
}

.visualizer-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 3px 10px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.05);
  font-size: 0.75rem;
}

.status-badge.active {
  background: rgba(56, 189, 248, 0.15);
  color: var(--csf-blue);
  border: 1px solid rgba(56, 189, 248, 0.3);
}

/* メイン再生ボタン */
.play-control-area {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  margin: 20px 0;
}

.primary-play-btn {
  width: 100%;
  max-width: 380px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  font-size: 1.15rem;
  font-weight: 600;
  font-family: var(--font-sans);
  color: #ffffff;
  background: linear-gradient(135deg, #7b2cbf 0%, #4a00e0 100%);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 999px;
  cursor: pointer;
  box-shadow: 0 8px 24px rgba(123, 44, 191, 0.4);
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

.primary-play-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 32px rgba(123, 44, 191, 0.6);
  filter: brightness(1.1);
}

.primary-play-btn:active {
  transform: translateY(1px);
}

.primary-play-btn.playing {
  background: linear-gradient(135deg, #1f293d 0%, #111a2e 100%);
  border-color: rgba(56, 189, 248, 0.4);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.5);
  color: var(--csf-blue);
}

.play-tip {
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* モード切り替え */
.section-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: #d1d5db;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.mode-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 10px;
  margin-bottom: 20px;
}

.mode-btn {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 14px;
  text-align: left;
  cursor: pointer;
  color: var(--text-main);
  transition: all 0.2s ease;
}

.mode-btn:hover {
  background: var(--bg-card-hover);
  border-color: rgba(255, 255, 255, 0.15);
}

.mode-btn.active {
  background: rgba(186, 104, 200, 0.12);
  border-color: var(--primary-purple);
  box-shadow: 0 0 16px rgba(186, 104, 200, 0.2);
}

.mode-name {
  font-size: 0.88rem;
  font-weight: 600;
  margin-bottom: 4px;
  color: #ffffff;
}

.mode-btn.active .mode-name {
  color: #f3c4fb;
}

.mode-desc {
  font-size: 0.74rem;
  color: var(--text-muted);
  line-height: 1.35;
}

/* コントロール・スライダー群 */
.controls-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 16px;
  margin-bottom: 20px;
}

.control-item {
  background: rgba(0, 0, 0, 0.25);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
}

.control-header {
  display: flex;
  justify-content: space-between;
  font-size: 0.82rem;
  margin-bottom: 8px;
}

.control-title {
  color: #d1d5db;
}

.control-val {
  color: var(--primary-purple);
  font-weight: 600;
  font-family: monospace;
}

input[type="range"] {
  width: 100%;
  accent-color: var(--primary-purple);
  height: 4px;
  border-radius: 2px;
  background: rgba(255, 255, 255, 0.1);
  cursor: pointer;
}

/* タイマーエリア */
.timer-area {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.timer-btn {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  font-size: 0.8rem;
  padding: 6px 14px;
  cursor: pointer;
  transition: all 0.2s;
}

.timer-btn:hover {
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-main);
}

.timer-btn.active {
  background: rgba(56, 189, 248, 0.15);
  border-color: var(--csf-blue);
  color: #ffffff;
}

.timer-display {
  font-size: 0.82rem;
  color: var(--csf-blue);
  font-family: monospace;
  margin-left: auto;
}

/* 科学的解説・エビデンスカード */
.evidence-card {
  border-left: 3px solid var(--primary-purple);
}

.evidence-header {
  margin-bottom: 12px;
}

.paper-meta {
  font-size: 0.8rem;
  color: #d8b4e2;
  background: rgba(216, 120, 255, 0.08);
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  margin-top: 8px;
}

.evidence-body {
  font-size: 0.88rem;
  color: #c9d1d9;
  line-height: 1.7;
}

.evidence-body p {
  margin-bottom: 12px;
}

.highlight-box {
  background: rgba(245, 158, 11, 0.08);
  border: 1px solid rgba(245, 158, 11, 0.25);
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  margin: 14px 0;
  font-size: 0.84rem;
  color: #fde68a;
}

.highlight-box strong {
  color: #fbbf24;
}

.ref-links {
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px solid var(--border-subtle);
  font-size: 0.8rem;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.ref-links a {
  color: var(--csf-blue);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.ref-links a:hover {
  text-decoration: underline;
}

/* フッター */
footer {
  text-align: center;
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: 36px;
  line-height: 1.5;
}

@media (max-width: 600px) {
  h1 {
    font-size: 1.45rem;
  }
  .visualizer-container {
    height: 190px;
  }
  .primary-play-btn {
    height: 56px;
    font-size: 1.05rem;
  }
}