:root {
  --bg: #f4efe6;
  --panel: rgba(255, 250, 241, 0.9);
  --ink: #1f2a2e;
  --muted: #5d6b70;
  --line: #d7c9ad;
  --accent: #1d6b63;
  --accent-soft: #dff2ed;
  --wrong: #a33d2f;
  --wrong-soft: #fde8e1;
  --shadow: 0 18px 45px rgba(56, 42, 24, 0.12);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at top left, rgba(239, 196, 119, 0.28), transparent 28%),
    radial-gradient(circle at bottom right, rgba(29, 107, 99, 0.18), transparent 26%),
    linear-gradient(180deg, #f9f5ee 0%, #efe6d8 100%);
}

.app-shell {
  width: min(1040px, calc(100% - 32px));
  margin: 0 auto;
  padding: 40px 0 56px;
}

.hero {
  margin-bottom: 22px;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-size: 0.76rem;
  font-weight: 700;
}

h1,
h2,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 10px;
  font-size: clamp(2rem, 4vw, 3.7rem);
  line-height: 1;
}

.subtitle {
  max-width: 700px;
  margin-bottom: 0;
  font-size: 1.03rem;
  color: var(--muted);
  line-height: 1.7;
}

.panel {
  background: var(--panel);
  border: 1px solid rgba(215, 201, 173, 0.7);
  border-radius: 24px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(10px);
}

.controls,
.staff-panel,
.keymap-panel,
.settings-panel,
.tips-panel {
  padding: 22px;
  margin-bottom: 18px;
}

.toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.mode-group {
  display: inline-flex;
  gap: 10px;
  padding: 8px;
  background: rgba(255, 255, 255, 0.65);
  border-radius: 999px;
  border: 1px solid rgba(215, 201, 173, 0.9);
}

.mode-button {
  border: 0;
  border-radius: 999px;
  padding: 10px 18px;
  background: transparent;
  color: var(--muted);
  font-size: 0.98rem;
  font-weight: 700;
  cursor: pointer;
  transition: transform 160ms ease, background 160ms ease, color 160ms ease;
}

.mode-button:hover,
.mode-button:focus-visible {
  background: rgba(29, 107, 99, 0.1);
  color: var(--accent);
  outline: none;
}

.mode-button.active {
  background: var(--accent);
  color: #fff;
}

.primary-button,
.secondary-button {
  border: 0;
  border-radius: 999px;
  padding: 10px 18px;
  font-size: 0.95rem;
  font-weight: 700;
  cursor: pointer;
  transition: transform 160ms ease, background 160ms ease, color 160ms ease, border-color 160ms ease;
}

.primary-button {
  background: var(--accent);
  color: #fff;
}

.secondary-button {
  background: rgba(255, 255, 255, 0.8);
  color: var(--ink);
  border: 1px solid rgba(215, 201, 173, 0.9);
}

.primary-button:hover,
.primary-button:focus-visible,
.secondary-button:hover,
.secondary-button:focus-visible {
  transform: translateY(-1px);
  outline: none;
}

.status-grid,
.prompt-row {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 14px;
  margin-top: 18px;
}

.prompt-row {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 0;
  margin-bottom: 18px;
}

.tempo-panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr) auto minmax(0, 1fr) auto;
  gap: 16px;
  align-items: center;
  margin-top: 18px;
}

.tempo-control {
  display: grid;
  gap: 8px;
  color: var(--ink);
  font-weight: 700;
}

.tempo-control span {
  font-size: 0.95rem;
}

.toggle-control {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  color: var(--ink);
}

.toggle-control input {
  width: 18px;
  height: 18px;
  accent-color: var(--accent);
}

.tempo-control input[type="range"] {
  width: 100%;
  accent-color: var(--accent);
}

.select-control {
  width: 100%;
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px solid rgba(215, 201, 173, 0.95);
  background: rgba(255, 255, 255, 0.92);
  color: var(--ink);
  font-size: 0.95rem;
}

.select-control:focus-visible {
  outline: 2px solid rgba(29, 107, 99, 0.24);
  border-color: var(--accent);
}

.practice-card {
  margin-top: 18px;
  padding: 14px 16px;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.74);
  border: 1px solid rgba(215, 201, 173, 0.85);
}

.practice-card strong {
  display: block;
  margin-bottom: 6px;
}

.practice-card p {
  margin-bottom: 0;
  color: var(--muted);
  line-height: 1.6;
}

.label {
  display: block;
  margin-bottom: 6px;
  font-size: 0.8rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

strong {
  font-size: 1.1rem;
}

#staff-svg {
  width: 100%;
  height: auto;
  display: block;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.9), rgba(249, 245, 237, 0.95));
  border-radius: 18px;
  border: 1px solid rgba(215, 201, 173, 0.9);
}

.staff-stage {
  position: relative;
}

.hit-effect {
  position: absolute;
  left: 19.2%;
  top: 14px;
  width: 120px;
  height: 120px;
  pointer-events: none;
  transform: translateX(-50%);
}

.hit-effect.hidden {
  display: none;
}

.hit-burst {
  position: absolute;
  inset: 10px;
  border-radius: 999px;
  border: 4px solid rgba(29, 107, 99, 0.35);
  background:
    radial-gradient(circle, rgba(29, 107, 99, 0.22) 0%, rgba(29, 107, 99, 0) 68%);
  animation: burst-pop 420ms ease-out forwards;
}

.hit-label {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  font-size: 1.15rem;
  font-weight: 900;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  white-space: nowrap;
  animation: label-float 520ms ease-out forwards;
}

.hit-effect.perfect .hit-burst {
  border-color: rgba(230, 164, 36, 0.72);
  background:
    radial-gradient(circle, rgba(255, 207, 93, 0.42) 0%, rgba(255, 207, 93, 0) 70%);
  box-shadow: 0 0 36px rgba(255, 197, 73, 0.34);
}

.hit-effect.perfect .hit-label {
  color: #d18a14;
  text-shadow: 0 0 18px rgba(255, 206, 101, 0.42);
}

.hit-effect.good .hit-burst {
  border-color: rgba(29, 107, 99, 0.64);
  background:
    radial-gradient(circle, rgba(29, 107, 99, 0.3) 0%, rgba(29, 107, 99, 0) 70%);
}

.hit-effect.good .hit-label {
  color: var(--accent);
}

.hit-effect.ok .hit-burst {
  border-color: rgba(91, 114, 132, 0.58);
  background:
    radial-gradient(circle, rgba(115, 143, 166, 0.24) 0%, rgba(115, 143, 166, 0) 70%);
}

.hit-effect.ok .hit-label {
  color: #5d6b70;
}

.feedback {
  margin: 18px 0 0;
  padding: 14px 16px;
  border-radius: 16px;
  font-weight: 700;
}

.feedback.neutral {
  background: rgba(255, 255, 255, 0.7);
  color: var(--muted);
}

.feedback.correct {
  background: var(--accent-soft);
  color: var(--accent);
}

.feedback.wrong {
  background: var(--wrong-soft);
  color: var(--wrong);
}

.keymap-panel {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.settings-panel.hidden {
  display: none;
}

.settings-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 18px;
  margin-bottom: 18px;
}

.settings-header h2,
.settings-column h3 {
  margin-bottom: 8px;
}

.settings-header p {
  margin-bottom: 0;
  color: var(--muted);
}

.settings-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.settings-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.settings-column {
  padding: 18px;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.62);
  border: 1px solid rgba(215, 201, 173, 0.75);
}

.settings-list {
  display: grid;
  gap: 12px;
}

.setting-row {
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: 12px;
  align-items: center;
}

.setting-note {
  font-weight: 800;
  color: var(--ink);
}

.setting-input {
  width: 100%;
  padding: 12px 14px;
  border-radius: 14px;
  border: 1px solid rgba(215, 201, 173, 0.95);
  background: rgba(255, 255, 255, 0.92);
  color: var(--ink);
  font-size: 1rem;
}

.setting-input:focus-visible {
  outline: 2px solid rgba(29, 107, 99, 0.24);
  border-color: var(--accent);
}

.settings-feedback {
  margin: 16px 0 0;
  padding: 14px 16px;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.72);
  color: var(--muted);
  font-weight: 700;
}

.settings-feedback.success {
  background: var(--accent-soft);
  color: var(--accent);
}

.settings-feedback.error {
  background: var(--wrong-soft);
  color: var(--wrong);
}

.keymap-column h2,
.tips-panel h2,
.settings-panel h2 {
  margin-bottom: 14px;
  font-size: 1.1rem;
}

.key-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.key-chip {
  min-width: 68px;
  padding: 12px 14px;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.85);
  border: 1px solid rgba(215, 201, 173, 0.85);
  text-align: center;
  transition: transform 120ms ease, background 120ms ease, border-color 120ms ease;
}

.key-chip .kbd {
  display: block;
  margin-bottom: 6px;
  font-size: 1.15rem;
  font-weight: 800;
  text-transform: uppercase;
}

.key-chip .note {
  color: var(--muted);
  font-size: 0.95rem;
}

.key-chip.active {
  transform: translateY(-2px) scale(1.03);
  background: #fff8ea;
  border-color: rgba(201, 136, 29, 0.72);
}

.tips-panel p:last-child {
  margin-bottom: 0;
}

.staff-label {
  font-size: 18px;
  fill: var(--muted);
  font-weight: 700;
  letter-spacing: 0.06em;
}

.staff-line,
.ledger-line {
  stroke: #6d6252;
  stroke-width: 2;
  stroke-linecap: round;
}

.beat-line {
  stroke: rgba(109, 98, 82, 0.22);
  stroke-width: 1.4;
}

.bar-line {
  stroke: rgba(109, 98, 82, 0.42);
  stroke-width: 2.2;
}

.target-line {
  stroke: var(--accent);
  stroke-width: 4;
  stroke-linecap: round;
  stroke-dasharray: 10 10;
}

.inactive-note {
  opacity: 0.14;
}

.note-head {
  fill: var(--ink);
}

.note-head.active-note {
  fill: #111;
}

.note-head.wrong-note {
  fill: #c13f32;
}

.note-head.preview-note {
  fill: rgba(17, 17, 17, 0.42);
}

.note-head.partial-note {
  fill: rgba(29, 107, 99, 0.82);
}

.note-stem {
  stroke: var(--ink);
  stroke-width: 2.5;
}

.note-stem.active-note {
  stroke: #111;
}

.note-stem.wrong-note {
  stroke: #c13f32;
}

.note-stem.preview-note {
  stroke: rgba(17, 17, 17, 0.42);
}

.note-stem.partial-note {
  stroke: rgba(29, 107, 99, 0.82);
}

.timing-text {
  fill: var(--accent);
  font-size: 18px;
  font-weight: 800;
  letter-spacing: 0.06em;
}

@keyframes burst-pop {
  0% {
    opacity: 0.05;
    transform: scale(0.35);
  }

  35% {
    opacity: 1;
    transform: scale(1);
  }

  100% {
    opacity: 0;
    transform: scale(1.35);
  }
}

@keyframes label-float {
  0% {
    opacity: 0;
    transform: translate(-50%, -20%) scale(0.82);
  }

  20% {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1);
  }

  100% {
    opacity: 0;
    transform: translate(-50%, -88%) scale(1.06);
  }
}

.clef {
  fill: #2a2622;
  font-family: Georgia, serif;
}

@media (max-width: 720px) {
  .app-shell {
    width: min(100% - 20px, 1040px);
    padding-top: 24px;
  }

  .controls,
  .staff-panel,
  .keymap-panel,
  .settings-panel,
  .tips-panel {
    padding: 18px;
    border-radius: 20px;
  }

  .status-grid,
  .prompt-row,
  .keymap-panel {
    grid-template-columns: 1fr 1fr;
  }

  .tempo-panel {
    grid-template-columns: 1fr;
  }

  .mode-group {
    display: grid;
    width: 100%;
    grid-template-columns: repeat(3, 1fr);
  }

  .toolbar,
  .settings-header {
    flex-direction: column;
    align-items: stretch;
  }

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

  .mode-button {
    width: 100%;
  }
}

@media (max-width: 520px) {
  .status-grid,
  .prompt-row,
  .keymap-panel,
  .settings-grid {
    grid-template-columns: 1fr;
  }

  .key-chip {
    min-width: calc(50% - 5px);
  }

  .setting-row {
    grid-template-columns: 1fr;
    gap: 8px;
  }
}