:root {
  --bg: #f4f7fb;
  --bg-elev: #ffffff;
  --bg-elev-2: #f1f4f9;
  --border: rgba(15, 23, 42, 0.12);
  --border-strong: rgba(15, 23, 42, 0.18);
  --text: #0f172a;
  --muted: #475569;
  --accent: #38bdf8;
  --accent-2: #f97316;
  --radius-sm: 8px;
  --radius: 12px;
  --radius-lg: 16px;
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 14px;
  --space-5: 20px;
  --shadow-sm: 0 1px 0 rgba(255, 255, 255, 0.9) inset, 0 1px 2px rgba(15, 23, 42, 0.06), 0 8px 16px rgba(15, 23, 42, 0.06);
  --shadow-md: 0 10px 30px rgba(15, 23, 42, 0.12);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0e1118;
    --bg-elev: #171d2c;
    --bg-elev-2: #202840;
    --border: rgba(255, 255, 255, 0.12);
    --border-strong: rgba(255, 255, 255, 0.2);
    --text: #f1f5f9;
    --muted: #c0c7d5;
    --shadow-sm: 0 1px 0 rgba(255, 255, 255, 0.04) inset, 0 6px 16px rgba(0, 0, 0, 0.35);
    --shadow-md: 0 14px 44px rgba(0, 0, 0, 0.55);
  }
}

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

html {
  color-scheme: light dark;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  font-size: 15px;
  color: var(--text);
  min-height: 100vh;
  padding: clamp(12px, 2.5vw, 22px);
  background:
    radial-gradient(1000px 600px at 10% -10%, rgba(56, 189, 248, 0.12), transparent 60%),
    radial-gradient(900px 500px at 95% 10%, rgba(167, 139, 250, 0.1), transparent 60%),
    radial-gradient(1200px 800px at 50% 120%, rgba(249, 115, 22, 0.08), transparent 65%),
    var(--bg);
  line-height: 1.5;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration-color: rgba(255, 255, 255, 0.35);
  text-underline-offset: 3px;
}

a:hover {
  text-decoration-color: var(--accent);
}

a:focus-visible,
button:focus-visible,
select:focus-visible,
input:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.app {
  width: min(1200px, 100%);
  margin: 0 auto;
  padding: clamp(14px, 2.5vw, 22px);
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
  background: linear-gradient(180deg, var(--bg-elev), var(--bg-elev-2));
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  backdrop-filter: blur(10px);
}

.app-header {
  position: sticky;
  top: 0;
  z-index: 20;
  padding-bottom: var(--space-2);
  margin-bottom: var(--space-2);
  background: linear-gradient(180deg, var(--bg-elev) 0%, var(--bg-elev) 70%, transparent 100%);
  border-bottom: 1px solid var(--border);
}

.app-header-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-3);
  flex-wrap: wrap;
}

.brand {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.brand h1 {
  margin: 0;
  font-size: clamp(20px, 2.6vw, 28px);
  letter-spacing: -0.02em;
}

.brand p {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
  max-width: 720px;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.nav {
  display: flex;
  gap: var(--space-1);
  flex-wrap: wrap;
  margin-top: var(--space-2);
  overflow-x: auto;
  padding-bottom: 2px;
}

.nav a {
  display: inline-flex;
  align-items: center;
  padding: 6px 10px;
  font-size: 13px;
  border-radius: 999px;
  background: var(--bg-elev-2);
  border: 1px solid var(--border);
  text-decoration: none;
  transition: background 0.15s ease, border-color 0.15s ease, transform 0.12s ease;
  white-space: nowrap;
}

.nav a:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--border-strong);
  transform: translateY(-1px);
}

.section {
  margin-top: var(--space-4);
}

.panel {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-3);
  box-shadow: var(--shadow-sm);
}

.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
}

.panel-title {
  font-size: 16px;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin: 0;
}

.panel-subtitle {
  margin: 6px 0 0;
  font-size: 12px;
  color: var(--muted);
}

.grid {
  display: grid;
  gap: var(--space-4);
}

.grid.workspace {
  grid-template-columns: 1.1fr 1.4fr;
}

.grid.lower {
  grid-template-columns: 1.2fr 1fr;
}

.suggestions-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
}

.segmented {
  display: inline-flex;
  gap: 4px;
  padding: 4px;
  border-radius: 999px;
  background: var(--bg-elev-2);
  border: 1px solid var(--border);
  margin-bottom: var(--space-3);
}

.segmented .segmented-btn {
  background: transparent;
  border: 1px solid transparent;
  border-radius: 999px;
  padding: 5px 10px;
  font-size: 12px;
  font-weight: 600;
  color: var(--muted);
  transform: none;
}

.segmented .segmented-btn:hover {
  background: rgba(255, 255, 255, 0.06);
  border-color: transparent;
  transform: none;
}

.segmented .segmented-btn.is-active {
  background: var(--bg-elev-2);
  border-color: var(--border-strong);
  color: var(--text);
}

.tabpanels {
  display: grid;
  gap: var(--space-3);
}

.help-text {
  margin: 0 0 var(--space-2);
  font-size: 13px;
  color: var(--muted);
  line-height: 1.6;
}

.stack {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
  align-items: center;
}

.flex-1 {
  flex: 1 1 auto;
}

.stack.is-column {
  flex-direction: column;
  align-items: stretch;
}

.controls {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: var(--space-3);
  align-items: start;
}

.control {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
}

select,
button,
input[type="text"],
input[type="search"],
input[type="url"] {
  appearance: none;
  font: inherit;
  color: var(--text);
  background: var(--bg-elev-2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 8px 10px;
  transition: border-color 0.15s ease, background 0.2s ease, transform 0.12s ease;
}

select {
  padding-right: 40px;
  background-image:
    linear-gradient(45deg, transparent 50%, var(--muted) 50%),
    linear-gradient(135deg, var(--muted) 50%, transparent 50%);
  background-position:
    calc(100% - 18px) calc(50% - 2px),
    calc(100% - 12px) calc(50% - 2px);
  background-size: 6px 6px, 6px 6px;
  background-repeat: no-repeat;
}

select:hover,
input:hover {
  border-color: var(--border-strong);
}

button {
  cursor: pointer;
  font-weight: 600;
  justify-content: center;
  gap: 8px;
  background: var(--bg-elev-2);
}

button:hover {
  transform: translateY(-1px);
  border-color: var(--border-strong);
  background: rgba(255, 255, 255, 0.08);
}

button:active {
  transform: translateY(0);
}

.ghost {
  background: transparent;
}

.ghost:hover {
  background: rgba(255, 255, 255, 0.06);
}

.accent-2 {
  background: linear-gradient(135deg, rgba(56, 189, 248, 0.25), rgba(56, 189, 248, 0.06));
  border-color: rgba(56, 189, 248, 0.5);
  color: var(--text);
}

.accent-2:hover {
  background: linear-gradient(135deg, rgba(56, 189, 248, 0.35), rgba(56, 189, 248, 0.12));
  border-color: var(--accent);
}

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  padding: 0;
  border-radius: 999px;
}

.share-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.share-label {
  font-weight: 600;
}

input[type="range"] {
  appearance: none;
  width: 100%;
  height: 30px;
  background: transparent;
  padding: 0;
  border: none;
  cursor: pointer;
}

input[type="range"]::-webkit-slider-runnable-track {
  height: 6px;
  background: rgba(255, 255, 255, 0.14);
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.08);
}

input[type="range"]::-webkit-slider-thumb {
  appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 999px;
  background: var(--accent);
  border: 2px solid rgba(11, 18, 36, 0.9);
  margin-top: -7px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.35);
}

input[type="range"]::-moz-range-track {
  height: 6px;
  background: rgba(255, 255, 255, 0.14);
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.08);
}

input[type="range"]::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border-radius: 999px;
  background: var(--accent);
  border: 2px solid rgba(11, 18, 36, 0.9);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.35);
}

.scale-notes {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 12px;
  line-height: 1.5;
  padding: 8px 10px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--bg-elev-2);
  white-space: nowrap;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.progression {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-wrap: wrap;
  min-height: 48px;
}

.progression .empty {
  padding: 8px 10px;
  border-radius: 10px;
  border: 1px dashed var(--border-strong);
  color: var(--muted);
  background: var(--bg-elev-2);
}

.chord-chip {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: 8px 10px;
  border-radius: 10px;
  background: var(--bg-elev-2);
  border: 1px solid var(--border);
  cursor: pointer;
  transition: border-color 0.2s ease, background 0.2s ease;
}

.chord-chip.is-selected {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(56, 189, 248, 0.18);
}

.chord-chip:hover {
  border-color: var(--border-strong);
  background: rgba(255, 255, 255, 0.06);
}

.chord-chip strong {
  font-size: 14px;
}

.scale-finder {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.scale-finder-header {
  justify-content: space-between;
}

.modal-backdrop {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  padding: clamp(12px, 3vw, 24px);
  background: rgba(15, 23, 42, 0.55);
  backdrop-filter: blur(4px);
  z-index: 50;
}

.modal-backdrop[hidden] {
  display: none;
}

.modal {
  width: min(720px, 100%);
  max-height: min(82vh, 760px);
  overflow: auto;
  background: var(--bg-elev);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  display: flex;
  flex-direction: column;
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-3);
  border-bottom: 1px solid var(--border);
  background: var(--bg-elev);
  position: sticky;
  top: 0;
  z-index: 1;
}

.modal-body {
  padding: var(--space-3);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.modal-close {
  width: 36px;
  height: 36px;
  font-size: 16px;
  line-height: 1;
}

body.modal-open {
  overflow: hidden;
}

.scale-matches {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.scale-matches .empty {
  font-size: 12px;
  color: var(--muted);
  padding: 2px 0;
}

.scale-match {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 9px;
  border-radius: 999px;
  background: var(--bg-elev-2);
  border: 1px solid var(--border);
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: border-color 0.15s ease, background 0.15s ease, transform 0.12s ease;
}

.scale-match:hover {
  transform: translateY(-1px);
  border-color: var(--border-strong);
  background: var(--bg-elev);
}

.scale-match .scale-key {
  color: var(--muted);
  font-weight: 700;
}

.scale-match .scale-miss {
  color: var(--muted);
  font-weight: 500;
  font-size: 11px;
}

.chord-chip select,
.chord-chip button {
  padding: 4px 6px;
  font-size: 12px;
}

.pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 7px;
  border-radius: 999px;
  background: rgba(56, 189, 248, 0.12);
  border: 1px solid rgba(56, 189, 248, 0.3);
  color: var(--text);
  font-weight: 600;
  font-size: 11px;
  white-space: nowrap;
}

.pill.is-hidden {
  display: none;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: var(--space-3);
}

.card {
  background: var(--bg-elev-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-3);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.03);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  transition: transform 0.12s ease, border-color 0.2s ease, background 0.2s ease;
}

.card:hover {
  transform: translateY(-2px);
  border-color: var(--border-strong);
  background: rgba(255, 255, 255, 0.06);
}

.card h3 {
  margin: 0;
  font-size: 15px;
}

.card .meta {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  font-size: 12px;
  flex-wrap: wrap;
}

.card .actions {
  display: flex;
  gap: var(--space-2);
  margin-top: var(--space-1);
}

.chord-hover {
  cursor: help;
  text-decoration: underline dotted;
  text-underline-offset: 3px;
}

.chord-tooltip {
  position: fixed;
  z-index: 10000;
  pointer-events: none;
  opacity: 0;
  transform: translateY(6px);
  transition: opacity 0.08s ease, transform 0.08s ease;
}

.chord-tooltip.visible {
  opacity: 1;
  transform: translateY(0);
}

.chord-tooltip-inner {
  background: rgba(10, 12, 18, 0.98);
  border: 1px solid var(--border-strong);
  border-radius: 12px;
  padding: 10px 12px;
  box-shadow: var(--shadow-md);
  max-width: 340px;
  color: #f8fafc;
}

.chord-tooltip-title {
  font-weight: 700;
  font-size: 14px;
  margin-bottom: 4px;
}

.chord-tooltip-sub {
  color: #cbd5e1;
  font-size: 12px;
  margin-bottom: 8px;
}

.chord-tooltip pre {
  margin: 0;
}

.tab-block {
  background: var(--bg-elev-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-3);
  overflow-x: auto;
}

.tab {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 13px;
  line-height: 1.4;
  margin: 0;
  color: var(--text);
  white-space: pre;
}

.seo-content h2,
.seo-content h3 {
  margin-top: 0;
  letter-spacing: -0.01em;
}

.seo-content p {
  color: var(--muted);
  line-height: 1.7;
}

.seo-content ul {
  margin: 0;
  padding-left: 18px;
  color: var(--text);
  line-height: 1.7;
}

.seo-content details {
  background: var(--bg-elev-2);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 10px 12px;
}

.seo-content summary {
  cursor: pointer;
  font-weight: 600;
}

.seo-content dl {
  margin: 0;
}

.glossary-item {
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
}

.glossary-item:last-child {
  border-bottom: none;
}

.glossary-item dt {
  font-weight: 700;
}

.glossary-item dd {
  margin: 6px 0 0;
  color: var(--muted);
  line-height: 1.6;
}

.melody-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: var(--space-2);
  margin-top: var(--space-2);
}

.beat-cell {
  background: var(--bg-elev-2);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 10px;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.beat-cell strong {
  font-size: 13px;
  color: var(--muted);
}

.toast {
  position: fixed;
  left: 50%;
  bottom: 24px;
  transform: translate(-50%, 10px);
  opacity: 0;
  pointer-events: none;
  background: var(--bg-elev-2);
  border: 1px solid var(--border-strong);
  padding: 10px 14px;
  border-radius: 999px;
  box-shadow: var(--shadow-sm);
  font-weight: 600;
  font-size: 12px;
  transition: opacity 0.18s ease, transform 0.18s ease;
}

.toast.visible {
  opacity: 1;
  transform: translate(-50%, 0);
}

@media (max-width: 960px) {
  .grid.workspace,
  .grid.lower {
    grid-template-columns: 1fr;
  }

  .suggestions-grid {
    grid-template-columns: 1fr;
  }

  .app-header {
    position: static;
  }
}

@media (max-width: 720px) {
  .app {
    padding: 16px;
    gap: var(--space-4);
  }

  .controls {
    grid-template-columns: 1fr;
  }

  .card-grid {
    grid-template-columns: 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
    animation: none !important;
  }
}