/* 發音道館 — 基礎樣式（iPad Safari 友善） */
:root {
  --bg: #f4f7f5;
  --surface: #ffffff;
  --ink: #1a2e28;
  --muted: #5a6f67;
  --brand: #1a5f4a;
  --brand-soft: #d8efe6;
  --accent: #c45c26;
  --border: #d0ddd6;
  --danger: #a33;
  --radius: 14px;
  --shadow: 0 8px 24px rgba(26, 46, 40, 0.08);
  --font: "PingFang TC", "Noto Sans TC", "Helvetica Neue", system-ui, sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --tap: 44px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1a16;
    --surface: #17241f;
    --ink: #e8f2ed;
    --muted: #9bb0a6;
    --brand: #3dbe98;
    --brand-soft: #1a3d32;
    --accent: #e08a52;
    --border: #2a3f36;
    --shadow: 0 8px 24px rgba(0, 0, 0, 0.35);
  }
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  min-height: 100dvh;
  font-family: var(--font);
  color: var(--ink);
  background:
    radial-gradient(1200px 600px at 10% -10%, var(--brand-soft), transparent 60%),
    var(--bg);
  line-height: 1.55;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--brand);
  color: #fff;
  padding: 0.5rem 1rem;
  z-index: 100;
}

.skip-link:focus {
  left: 0.5rem;
  top: 0.5rem;
}

.site-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border);
  background: color-mix(in srgb, var(--surface) 92%, transparent);
  backdrop-filter: blur(8px);
  position: sticky;
  top: 0;
  z-index: 10;
}

.brand {
  display: flex;
  gap: 0.75rem;
  align-items: center;
}

.brand-mark {
  font-size: 1.75rem;
  line-height: 1;
}

.brand-title {
  margin: 0;
  font-size: 1.35rem;
  letter-spacing: 0.02em;
}

.brand-tag {
  margin: 0.15rem 0 0;
  color: var(--muted);
  font-size: 0.85rem;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.profile-label {
  font-size: 0.85rem;
  color: var(--muted);
}

.profile-select {
  min-height: var(--tap);
  min-width: 7.5rem;
  padding: 0.4rem 0.75rem;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--ink);
  font: inherit;
  font-size: 1rem;
}

.main {
  width: min(920px, 100%);
  margin: 0 auto;
  padding: 1.25rem 1rem 3rem;
  display: grid;
  gap: 1.25rem;
}

.banner {
  padding: 1.1rem 1.25rem;
  border-radius: var(--radius);
  background: linear-gradient(135deg, var(--brand-soft), var(--surface));
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}

.banner h2 {
  margin: 0 0 0.4rem;
  font-size: 1.2rem;
  color: var(--brand);
}

.banner p {
  margin: 0;
  color: var(--ink);
}

.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.1rem 1.25rem 1.25rem;
  box-shadow: var(--shadow);
}

.panel h2 {
  margin: 0 0 0.35rem;
  font-size: 1.1rem;
}

.panel-note,
.hint {
  margin: 0 0 0.85rem;
  color: var(--muted);
  font-size: 0.92rem;
}

.chapter-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.75rem;
}

@media (min-width: 640px) {
  .chapter-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.chapter-card {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  min-height: 8.5rem;
  padding: 1rem;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--bg) 65%, var(--surface));
  text-align: left;
  font: inherit;
  color: inherit;
  cursor: pointer;
  transition: border-color 0.15s ease, transform 0.12s ease;
  -webkit-tap-highlight-color: transparent;
}

.chapter-card:hover,
.chapter-card:focus-visible {
  border-color: var(--brand);
  outline: none;
  transform: translateY(-1px);
}

.chapter-card:disabled {
  opacity: 0.85;
  cursor: default;
  transform: none;
}

.chapter-card .badge {
  align-self: flex-start;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--accent);
  background: color-mix(in srgb, var(--accent) 15%, transparent);
  padding: 0.15rem 0.45rem;
  border-radius: 999px;
}

.chapter-card h3 {
  margin: 0;
  font-size: 1.05rem;
}

.chapter-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.88rem;
  flex: 1;
}

.chapter-card .state {
  font-size: 0.8rem;
  color: var(--brand);
  font-weight: 600;
}

.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.5rem;
}

.btn {
  min-height: var(--tap);
  padding: 0.55rem 1rem;
  border-radius: 12px;
  border: none;
  background: var(--brand);
  color: #fff;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

.btn:active {
  transform: scale(0.98);
}

.btn-ghost {
  background: transparent;
  color: var(--brand);
  border: 1px solid var(--border);
}

.mic-status {
  padding: 0.65rem 0.8rem;
  border-radius: 10px;
  background: var(--brand-soft);
  border: 1px solid var(--border);
  font-size: 0.95rem;
}

.mic-status.is-ok {
  border-color: color-mix(in srgb, var(--brand) 50%, var(--border));
}

.mic-status.is-warn {
  background: color-mix(in srgb, var(--accent) 12%, var(--surface));
  border-color: color-mix(in srgb, var(--accent) 40%, var(--border));
}

.mic-status.is-err {
  background: color-mix(in srgb, var(--danger) 10%, var(--surface));
  border-color: color-mix(in srgb, var(--danger) 35%, var(--border));
}

.code-block {
  margin: 0;
  padding: 0.85rem 1rem;
  border-radius: 10px;
  background: color-mix(in srgb, var(--bg) 80%, #000 5%);
  border: 1px solid var(--border);
  overflow: auto;
  font-family: var(--mono);
  font-size: 0.78rem;
  line-height: 1.45;
  white-space: pre-wrap;
  word-break: break-word;
}

.site-footer {
  text-align: center;
  padding: 1.5rem 1rem 2.5rem;
  color: var(--muted);
  font-size: 0.85rem;
}

.site-footer p {
  margin: 0.2rem 0;
}

.footer-meta {
  opacity: 0.85;
}

code {
  font-family: var(--mono);
  font-size: 0.9em;
  padding: 0.05em 0.3em;
  border-radius: 4px;
  background: color-mix(in srgb, var(--brand-soft) 70%, transparent);
}