:root {
  --bg: #f4efe4;
  --panel: rgba(255, 252, 246, 0.92);
  --panel-strong: #fffaf1;
  --text: #1c1a18;
  --muted: #6f675b;
  --line: rgba(66, 51, 35, 0.12);
  --primary: #1e8bff;
  --primary-dark: #0a61ba;
  --success: #1a9b5c;
  --danger: #d64545;
  --shadow: 0 18px 45px rgba(55, 39, 13, 0.12);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(255, 224, 165, 0.55), transparent 30%),
    radial-gradient(circle at top right, rgba(121, 198, 255, 0.4), transparent 24%),
    linear-gradient(180deg, #fbf7ee 0%, #f1eadc 100%);
}

.chord-trainer-body .navbar {
  background: rgba(255, 255, 255, 0.94) !important;
  border-bottom-color: rgba(0, 0, 0, 0.06);
}

.chord-trainer-body .footer {
  background: transparent;
  border-top: 1px solid rgba(0, 0, 0, 0.06);
}

.ct-page {
  max-width: 1180px;
  margin: 0 auto;
  padding: 100px 16px 48px;
}

.ct-back {
  display: inline-block;
  margin-bottom: 1.25rem;
  color: #a3432f;
  text-decoration: none;
  font-weight: 500;
  font-size: 0.92rem;
}

.ct-back:hover {
  text-decoration: underline;
}

.app-shell {
  width: min(1100px, calc(100% - 32px));
  margin: 0 auto 48px;
  display: grid;
  gap: 18px;
  font-family: "SF Mono", "IBM Plex Mono", "Menlo", monospace;
}

.hero-card,
.keyboard-card,
.stat-card,
.control-card,
.prompt-card,
.help-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 24px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(10px);
}

.hero-card {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  align-items: center;
  padding: 24px 28px;
}

.eyebrow,
.status-label,
.prompt-label,
.stat-card span,
.help-card h3 {
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.78rem;
  color: var(--muted);
}

.hero-copy h1 {
  margin: 8px 0 12px;
  font-size: clamp(2rem, 4vw, 3.4rem);
  line-height: 0.95;
}

.subcopy {
  max-width: 56ch;
  margin: 0;
  color: var(--muted);
}

.keyboard-card {
  padding: 18px;
}

.keyboard-status {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin-bottom: 16px;
}

.keyboard {
  position: relative;
  height: 220px;
  overflow-x: auto;
  padding: 16px 8px 8px;
  border-radius: 18px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.9), rgba(240, 233, 223, 0.9));
  border: 1px solid rgba(90, 72, 52, 0.08);
}

.keyboard-inner {
  position: relative;
  height: 100%;
  min-width: 1400px;
}

.white-key,
.black-key {
  position: absolute;
  border-radius: 0 0 10px 10px;
  border: 1px solid rgba(37, 30, 20, 0.15);
  transition: transform 120ms ease, background-color 120ms ease, box-shadow 120ms ease;
}

.white-key {
  width: 42px;
  height: 180px;
  background: linear-gradient(180deg, #fffef7 0%, #f2ecdf 100%);
}

.black-key {
  width: 26px;
  height: 110px;
  background: linear-gradient(180deg, #494949 0%, #151515 100%);
  border-color: rgba(255, 255, 255, 0.06);
  z-index: 2;
}

.white-key.active {
  background: linear-gradient(180deg, #8fd0ff 0%, #2d8ff0 100%);
  box-shadow: inset 0 0 0 2px rgba(255, 255, 255, 0.35);
  transform: translateY(2px);
}

.black-key.active {
  background: linear-gradient(180deg, #77c4ff 0%, #1066d8 100%);
  box-shadow: 0 0 0 2px rgba(255, 255, 255, 0.16);
  transform: translateY(2px);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.stat-card {
  padding: 18px 20px;
}

.stat-card strong {
  display: block;
  margin-top: 8px;
  font-size: clamp(1.6rem, 2vw, 2.4rem);
}

.stat-card.accent {
  background: linear-gradient(135deg, rgba(30, 139, 255, 0.18), rgba(255, 255, 255, 0.92));
}

.progress-track {
  height: 10px;
  margin-top: 16px;
  border-radius: 999px;
  overflow: hidden;
  background: rgba(35, 53, 88, 0.12);
}

.progress-fill {
  width: 0%;
  height: 100%;
  background: linear-gradient(90deg, var(--primary), #67b2ff);
  transition: width 200ms ease;
}

.control-card,
.prompt-card,
.help-card {
  padding: 24px 28px;
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.app-shell button {
  appearance: none;
  border: none;
  border-radius: 14px;
  cursor: pointer;
  font: inherit;
  padding: 14px 20px;
  transition: transform 120ms ease, opacity 120ms ease, background-color 120ms ease;
}

.app-shell button:hover {
  transform: translateY(-1px);
}

.app-shell button:active {
  transform: translateY(1px);
}

.primary-button {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: white;
}

.secondary-button {
  background: rgba(30, 139, 255, 0.12);
  color: var(--primary-dark);
}

.ghost-button {
  background: rgba(28, 26, 24, 0.08);
  color: var(--text);
}

.settings-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  margin-top: 20px;
}

.secondary-settings {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.toggle-row,
.slider-row,
.category-picker {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  border-radius: 16px;
  background: var(--panel-strong);
  border: 1px solid var(--line);
}

.toggle-row input {
  margin-left: auto;
}

.slider-row input[type="range"] {
  flex: 1;
}

.category-picker {
  align-items: flex-start;
  flex-direction: column;
  min-height: 100%;
}

.category-title {
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.78rem;
  color: var(--muted);
}

.category-option {
  display: flex;
  align-items: center;
  gap: 10px;
}

.category-option input {
  margin: 0;
}

.prompt-card {
  text-align: center;
}

.prompt-card h2 {
  margin: 10px 0 12px;
  font-size: clamp(2rem, 6vw, 4rem);
  line-height: 1.05;
}

.live-notes-text {
  min-height: 1.6em;
  margin: 0 0 14px;
  font-size: clamp(1.2rem, 2.8vw, 2rem);
  font-weight: 600;
  color: #6f675b;
}

.attempt-notes-text {
  min-height: 1.4em;
  margin: -6px 0 16px;
  font-size: clamp(1rem, 2vw, 1.35rem);
  font-weight: 500;
  color: #8a8276;
}

.result-text {
  min-height: 1.5em;
  font-size: 1.05rem;
}

.result-text.success {
  color: var(--success);
}

.result-text.error {
  color: var(--danger);
}

.result-text.neutral {
  color: var(--muted);
}

.answer-text {
  color: var(--muted);
  min-height: 1.5em;
}

.help-card ul {
  margin: 12px 0 0;
  padding-left: 20px;
  color: var(--muted);
}

@media (max-width: 900px) {
  .hero-card,
  .settings-grid,
  .stats-grid,
  .keyboard-status {
    grid-template-columns: 1fr;
  }

  .hero-card {
    flex-direction: column;
    align-items: flex-start;
  }
}