:root {
  --teal: #24a3bc;
  --teal-dark: #1b7d91;
  --ink: #1f2933;
  --paper: #ffffff;
  --muted: #5b6b74;
  --border: #e2e8ec;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--ink);
  background: #fafcfc;
  line-height: 1.6;
}

.wrap {
  max-width: 640px;
  margin: 0 auto;
  padding: 48px 24px 96px;
}

.brand {
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--teal-dark);
  text-transform: uppercase;
  margin-bottom: 8px;
}

h1 {
  font-size: 28px;
  line-height: 1.3;
  margin: 0 0 8px;
}

.subtitle {
  color: var(--muted);
  font-size: 17px;
  margin: 0 0 32px;
}

.card {
  background: var(--paper);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 24px;
  margin-bottom: 24px;
}

.card h2 {
  font-size: 15px;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  color: var(--muted);
  margin: 0 0 16px;
}

audio {
  width: 100%;
  border-radius: 8px;
}

.btn {
  display: inline-block;
  width: 100%;
  text-align: center;
  background: var(--teal);
  color: #fff;
  font-size: 18px;
  font-weight: 600;
  padding: 16px 20px;
  border-radius: 10px;
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: background 0.15s ease;
}

.btn:hover { background: var(--teal-dark); }

.btn.secondary {
  background: #fff;
  color: var(--teal-dark);
  border: 2px solid var(--teal);
}

.btn.secondary:hover { background: #eef8fa; }

.price {
  text-align: center;
  font-size: 15px;
  color: var(--muted);
  margin: 12px 0 0;
}

.field {
  display: block;
  width: 100%;
  font-size: 17px;
  padding: 14px 16px;
  border-radius: 10px;
  border: 1px solid var(--border);
  margin-bottom: 16px;
}

.field:focus {
  outline: none;
  border-color: var(--teal);
}

.foot-link {
  text-align: center;
  margin-top: 24px;
  font-size: 15px;
}

.foot-link a { color: var(--teal-dark); }

.notice {
  background: #eef8fa;
  border: 1px solid #cdeaf0;
  color: var(--teal-dark);
  padding: 14px 16px;
  border-radius: 10px;
  font-size: 15px;
  margin-bottom: 20px;
}

.notice.error {
  background: #fdeeee;
  border-color: #f3c6c6;
  color: #a13636;
}

/* Player page */

.chapter-list {
  list-style: none;
  margin: 0;
  padding: 0;
  max-height: 420px;
  overflow-y: auto;
  border: 1px solid var(--border);
  border-radius: 10px;
}

.chapter-list li {
  border-bottom: 1px solid var(--border);
}

.chapter-list li:last-child { border-bottom: none; }

.chapter-btn {
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  padding: 16px 18px;
  font-size: 16px;
  cursor: pointer;
  color: var(--ink);
  display: flex;
  gap: 12px;
  align-items: center;
}

.chapter-btn:hover { background: #f5fafb; }

.chapter-btn.active {
  background: var(--teal);
  color: #fff;
  font-weight: 600;
}

.chapter-num {
  color: var(--muted);
  min-width: 24px;
}

.chapter-btn.active .chapter-num { color: #e8f7fa; }

.player-bar {
  position: sticky;
  top: 0;
  background: var(--paper);
  padding-top: 8px;
  z-index: 5;
}

.now-playing {
  font-size: 15px;
  color: var(--muted);
  margin-bottom: 8px;
}

.status {
  font-size: 15px;
  color: var(--muted);
  text-align: center;
  padding: 24px;
}