/* Suno 教學 App - 莫蘭迪暖灰配色 */
:root {
  --bg: #EDE8E0;
  --bg-card: #F5F1EA;
  --bg-elev: #FAF7F1;
  --bg-code: #E8E2D6;
  --ink: #3D362D;
  --ink-soft: #5A5248;
  --ink-muted: #8B8378;
  --line: #D9D2C5;
  --line-soft: #E5DFD2;
  --accent: #A89888;
  --accent-deep: #7A6F60;
  --good: #8FA68E;
  --bad: #C4847C;
  --warn: #C9B27A;
  --info: #8B9DA8;
  --shadow-sm: 0 1px 2px rgba(90, 82, 72, 0.05);
  --shadow-md: 0 4px 12px rgba(90, 82, 72, 0.08);
  --shadow-lg: 0 12px 32px rgba(90, 82, 72, 0.10);
  --radius: 10px;
  --radius-lg: 16px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  font-family: 'Noto Sans TC', -apple-system, sans-serif;
  background: var(--bg);
  color: var(--ink);
  font-size: 15px;
  line-height: 1.7;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
}

code, pre, .mono { font-family: 'JetBrains Mono', 'SF Mono', monospace; }

/* === Layout === */
.app {
  display: grid;
  grid-template-columns: 280px 1fr;
  min-height: 100vh;
}

/* === Sidebar === */
.sidebar {
  background: var(--bg-card);
  border-right: 1px solid var(--line);
  padding: 32px 20px 32px 28px;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
}
.sidebar-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 32px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--line-soft);
}
.brand-mark {
  width: 36px; height: 36px;
  border-radius: 8px;
  background: var(--ink-soft);
  color: var(--bg-card);
  display: grid; place-items: center;
  font-weight: 700;
  font-size: 14px;
  letter-spacing: 0.02em;
}
.brand-text { line-height: 1.2; }
.brand-text .t { font-weight: 600; font-size: 15px; color: var(--ink); }
.brand-text .s { font-size: 11px; color: var(--ink-muted); margin-top: 2px; letter-spacing: 0.05em; }

.nav-section {
  margin-bottom: 24px;
}
.nav-label {
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--ink-muted);
  text-transform: uppercase;
  padding: 0 12px;
  margin-bottom: 6px;
}
.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  border-radius: 8px;
  font-size: 14px;
  color: var(--ink-soft);
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
  user-select: none;
  border: none;
  background: transparent;
  width: 100%;
  text-align: left;
  font-family: inherit;
}
.nav-item:hover { background: var(--line-soft); color: var(--ink); }
.nav-item.active {
  background: var(--ink-soft);
  color: var(--bg-card);
  font-weight: 500;
}
.nav-item .num {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  color: var(--ink-muted);
  min-width: 20px;
}
.nav-item.active .num { color: var(--bg-elev); opacity: 0.7; }

.sidebar-foot {
  margin-top: auto;
  padding: 16px 12px 0;
  font-size: 11px;
  color: var(--ink-muted);
  line-height: 1.5;
}

/* === Main === */
.main {
  padding: 56px 64px 96px;
  max-width: 920px;
  margin: 0 auto;
  width: 100%;
}
.section { display: none; animation: fade 0.3s ease; }
.section.active { display: block; }
@keyframes fade {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

/* === Typography === */
.eyebrow {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.16em;
  color: var(--accent-deep);
  text-transform: uppercase;
  margin-bottom: 12px;
  padding: 4px 10px;
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: 100px;
}
h1 {
  font-size: 38px;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.15;
  color: var(--ink);
  margin-bottom: 16px;
}
h2 {
  font-size: 22px;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 40px 0 14px;
  color: var(--ink);
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line-soft);
}
h3 {
  font-size: 17px;
  font-weight: 600;
  margin: 24px 0 8px;
  color: var(--ink-soft);
}
p { color: var(--ink-soft); margin-bottom: 14px; max-width: 68ch; }
.lead {
  font-size: 17px;
  color: var(--ink-soft);
  line-height: 1.7;
  margin-bottom: 32px;
  max-width: 64ch;
}
strong { color: var(--ink); font-weight: 600; }
em { font-style: normal; color: var(--accent-deep); font-weight: 500; }

/* === Cards === */
.card {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 24px 28px;
  margin: 20px 0;
  box-shadow: var(--shadow-sm);
}
.card-tight { padding: 16px 20px; }
.callout {
  display: flex;
  gap: 14px;
  padding: 16px 20px;
  border-radius: var(--radius);
  margin: 18px 0;
  border-left: 3px solid var(--accent);
  background: var(--bg-card);
}
.callout-good { border-left-color: var(--good); }
.callout-bad { border-left-color: var(--bad); }
.callout-warn { border-left-color: var(--warn); }
.callout-info { border-left-color: var(--info); }
.callout-icon {
  font-family: 'JetBrains Mono', monospace;
  font-weight: 700;
  font-size: 13px;
  flex-shrink: 0;
  color: var(--accent-deep);
  width: 22px;
}
.callout-good .callout-icon { color: var(--good); }
.callout-bad .callout-icon { color: var(--bad); }
.callout-warn .callout-icon { color: var(--warn); }
.callout-info .callout-icon { color: var(--info); }
.callout-body { font-size: 14px; color: var(--ink-soft); }
.callout-body strong { display: block; color: var(--ink); margin-bottom: 2px; font-size: 13px; }

/* === Code Block === */
.codeblock {
  position: relative;
  background: var(--bg-code);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  line-height: 1.7;
  overflow: hidden;
  margin: 14px 0;
}
.codeblock-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 14px;
  background: rgba(90, 82, 72, 0.04);
  border-bottom: 1px solid var(--line-soft);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--ink-muted);
  text-transform: uppercase;
  font-weight: 500;
}
.codeblock pre {
  padding: 14px 18px;
  white-space: pre-wrap;
  word-break: break-word;
  color: var(--ink);
}
.copy-btn {
  border: 1px solid var(--line);
  background: var(--bg-elev);
  color: var(--ink-soft);
  padding: 4px 10px;
  border-radius: 6px;
  font-family: inherit;
  font-size: 11px;
  cursor: pointer;
  transition: all 0.15s;
  letter-spacing: 0.04em;
}
.copy-btn:hover { background: var(--ink-soft); color: var(--bg-card); border-color: var(--ink-soft); }
.copy-btn.copied { background: var(--good); color: white; border-color: var(--good); }

/* token highlight */
.tok-bracket { color: var(--accent-deep); font-weight: 600; }
.tok-paren   { color: #6E8B7A; font-weight: 500; }
.tok-meta    { color: var(--info); }
.tok-comment { color: var(--ink-muted); font-style: italic; }

/* === Pills / Tags === */
.pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 11px;
  border-radius: 100px;
  background: var(--bg-elev);
  border: 1px solid var(--line);
  font-size: 12px;
  color: var(--ink-soft);
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s;
  font-family: inherit;
}
.pill:hover { border-color: var(--accent); color: var(--ink); }
.pill .pill-en { color: var(--ink-muted); font-family: 'JetBrains Mono', monospace; font-size: 11px; }
.pill-row { display: flex; flex-wrap: wrap; gap: 8px; margin: 12px 0 20px; }

/* === Tabs (對照切換) === */
.tabs {
  display: flex;
  gap: 4px;
  background: var(--bg-code);
  padding: 4px;
  border-radius: 10px;
  margin-bottom: 16px;
  width: fit-content;
}
.tab {
  border: none;
  background: transparent;
  padding: 7px 16px;
  border-radius: 7px;
  font-size: 13px;
  font-weight: 500;
  color: var(--ink-muted);
  cursor: pointer;
  font-family: inherit;
  transition: all 0.15s;
}
.tab.active { background: var(--bg-card); color: var(--ink); box-shadow: var(--shadow-sm); }
.tab-panel { display: none; }
.tab-panel.active { display: block; animation: fade 0.2s ease; }

/* === Compare grid === */
.compare {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin: 16px 0;
}
.compare-col h4 {
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-muted);
  margin-bottom: 8px;
  font-weight: 600;
}
.compare-col .codeblock { margin: 0; }

/* === Categorized lists (儀器) === */
.cat-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin: 18px 0;
}
.cat-card {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 20px;
}
.cat-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 12px;
  padding-bottom: 10px;
  border-bottom: 1px dashed var(--line);
}
.cat-title { font-weight: 600; color: var(--ink); font-size: 15px; }
.cat-en { font-family: 'JetBrains Mono', monospace; font-size: 11px; color: var(--ink-muted); letter-spacing: 0.04em; }

/* === Style cards === */
.style-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin-top: 18px;
}
.style-card {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 20px;
  position: relative;
  transition: all 0.2s;
}
.style-card:hover { border-color: var(--accent); transform: translateY(-1px); box-shadow: var(--shadow-md); }
.style-card .num {
  position: absolute;
  top: 14px; right: 16px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  color: var(--ink-muted);
}
.style-name { font-weight: 600; color: var(--ink); font-size: 15px; margin-bottom: 2px; }
.style-en { font-family: 'JetBrains Mono', monospace; font-size: 11px; color: var(--ink-muted); margin-bottom: 10px; letter-spacing: 0.03em; }
.style-desc { font-size: 13px; color: var(--ink-soft); line-height: 1.6; margin-bottom: 12px; }
.style-tags { display: flex; flex-wrap: wrap; gap: 5px; }
.style-tag {
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px;
  background: var(--bg-elev);
  color: var(--accent-deep);
  padding: 3px 7px;
  border-radius: 4px;
  border: 1px solid var(--line-soft);
}

/* === Lyrics builder === */
.builder {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 22px;
  margin: 18px 0;
}
.builder-cols {
  display: grid;
  grid-template-columns: 1fr 1.3fr;
  gap: 18px;
}
.builder-col h4 {
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-muted);
  margin-bottom: 10px;
  font-weight: 600;
}
.palette {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.block-source, .block-canvas .block {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: 8px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  cursor: grab;
  transition: all 0.15s;
  user-select: none;
}
.block-source:hover { border-color: var(--accent); }
.block-source:active { cursor: grabbing; }
.block-source .b-name { color: var(--accent-deep); font-weight: 600; }
.block-source .b-hint { font-size: 11px; color: var(--ink-muted); font-family: 'Noto Sans TC', sans-serif; }

.block-canvas {
  min-height: 280px;
  background: var(--bg-elev);
  border: 1.5px dashed var(--line);
  border-radius: 8px;
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  transition: all 0.15s;
}
.block-canvas.drag-over { border-color: var(--accent); background: var(--bg-code); }
.block-canvas:empty::before {
  content: '把左邊的區塊拖過來，組成一首歌的結構';
  color: var(--ink-muted);
  font-size: 13px;
  text-align: center;
  margin: auto;
  font-family: 'Noto Sans TC', sans-serif;
}
.block-canvas .block {
  cursor: grab;
  background: var(--bg-card);
  border: 1px solid var(--line);
}
.block-canvas .block .b-name { color: var(--accent-deep); font-weight: 600; }
.block-canvas .block.dragging { opacity: 0.4; }
.block-canvas .block .remove {
  border: none;
  background: transparent;
  color: var(--ink-muted);
  cursor: pointer;
  font-family: inherit;
  font-size: 14px;
  padding: 0 4px;
}
.block-canvas .block .remove:hover { color: var(--bad); }

.builder-actions {
  display: flex;
  gap: 8px;
  margin-top: 14px;
}
.btn {
  border: 1px solid var(--line);
  background: var(--bg-elev);
  padding: 8px 14px;
  border-radius: 8px;
  font-family: inherit;
  font-size: 13px;
  color: var(--ink-soft);
  cursor: pointer;
  transition: all 0.15s;
}
.btn:hover { border-color: var(--accent); color: var(--ink); }
.btn-primary { background: var(--ink-soft); color: var(--bg-card); border-color: var(--ink-soft); }
.btn-primary:hover { background: var(--ink); border-color: var(--ink); color: var(--bg-elev); }

.builder-output {
  margin-top: 14px;
  background: var(--bg-code);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 14px 16px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  white-space: pre-wrap;
  min-height: 60px;
  color: var(--ink);
}
.builder-output .empty { color: var(--ink-muted); font-style: italic; font-family: 'Noto Sans TC', sans-serif; }

/* === Tables === */
.kv-table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0;
  font-size: 14px;
}
.kv-table th, .kv-table td {
  padding: 12px 14px;
  text-align: left;
  border-bottom: 1px solid var(--line-soft);
  vertical-align: top;
}
.kv-table th {
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-muted);
  font-weight: 600;
  background: var(--bg-card);
}
.kv-table td:first-child { font-family: 'JetBrains Mono', monospace; color: var(--accent-deep); font-weight: 600; white-space: nowrap; }
.kv-table tr:hover td { background: var(--bg-card); }

/* === Step list === */
.steps { counter-reset: step; margin: 18px 0; }
.step {
  position: relative;
  padding: 14px 18px 14px 56px;
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  margin-bottom: 10px;
  counter-increment: step;
}
.step::before {
  content: counter(step, decimal-leading-zero);
  position: absolute;
  left: 18px; top: 14px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  color: var(--accent-deep);
  font-weight: 700;
  letter-spacing: 0.05em;
}
.step-title { font-weight: 600; color: var(--ink); margin-bottom: 4px; font-size: 14px; }
.step-body { font-size: 13.5px; color: var(--ink-soft); line-height: 1.65; }

/* progress dots */
.progress {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 24px;
}
.progress-dots { display: flex; gap: 5px; }
.progress-dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--line);
}
.progress-dot.active { background: var(--accent-deep); width: 18px; border-radius: 3px; }
.progress-text {
  font-size: 11px;
  color: var(--ink-muted);
  font-family: 'JetBrains Mono', monospace;
  letter-spacing: 0.06em;
}

/* nav buttons */
.section-nav {
  display: flex;
  justify-content: space-between;
  margin-top: 56px;
  padding-top: 24px;
  border-top: 1px solid var(--line-soft);
  gap: 12px;
}
.section-nav .btn {
  display: flex; flex-direction: column;
  align-items: flex-start;
  padding: 12px 18px;
  min-width: 180px;
}
.section-nav .btn.next { align-items: flex-end; margin-left: auto; }
.section-nav .btn .l { font-size: 10px; letter-spacing: 0.12em; text-transform: uppercase; color: var(--ink-muted); margin-bottom: 2px; }
.section-nav .btn .t { font-size: 14px; color: var(--ink); font-weight: 500; }

/* small */
.small { font-size: 12px; color: var(--ink-muted); }

/* divider */
.divider { height: 1px; background: var(--line-soft); margin: 28px 0; }

/* === Responsive === */
@media (max-width: 880px) {
  .app { grid-template-columns: 1fr; }
  .sidebar { position: relative; height: auto; }
  .main { padding: 32px 24px 64px; }
  .compare, .cat-grid, .style-grid, .builder-cols { grid-template-columns: 1fr; }
}