:root {
  color-scheme: dark;
  --bg: #090b12;
  --card: rgba(255, 255, 255, 0.09);
  --card-strong: rgba(255, 255, 255, 0.14);
  --text: #f5f7fb;
  --text-sec: #a9b0c0;
  --muted: #a9b0c0;
  --accent: #8effd2;
  --accent-2: #91a7ff;
  --warn: #ffd166;
  --bad: #ff6b6b;
  --track-bg: linear-gradient(90deg, var(--bad), var(--warn) 32%, var(--accent) 50%, var(--warn) 68%, var(--bad));
  --needle-glow: rgba(255, 255, 255, 0.76);
  --detail-bg: rgba(0, 0, 0, 0.18);
  --toggle-bg: rgba(255, 255, 255, 0.08);
  --toggle-hover: rgba(255, 255, 255, 0.14);
  --roll-bg: #070910;
  --roll-grid: rgba(255, 255, 255, 0.055);
  --roll-c-grid: rgba(142, 255, 210, 0.26);
  --roll-label-light: #141824;
  --roll-label-dark: #eef2ff;
  --roll-key-light: #eef2ff;
  --roll-key-dark: #11131c;
  --roll-key-black: #05060a;
  --roll-text: rgba(255, 255, 255, 0.42);
  --roll-border: rgba(255, 255, 255, 0.10);
  --roll-help: #d7dceb;
  --tips-text: #d7dceb;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

[data-theme="light"] {
  color-scheme: light;
  --bg: #f4f5f7;
  --card: rgba(255, 255, 255, 0.85);
  --card-strong: rgba(0, 0, 0, 0.06);
  --text: #1a1d26;
  --text-sec: #5c6378;
  --muted: #5c6378;
  --accent: #0d9f6e;
  --accent-2: #6366f1;
  --warn: #d97706;
  --bad: #dc2626;
  --track-bg: linear-gradient(90deg, var(--bad), var(--warn) 32%, var(--accent) 50%, var(--warn) 68%, var(--bad));
  --needle-glow: rgba(0, 0, 0, 0.25);
  --detail-bg: rgba(0, 0, 0, 0.04);
  --toggle-bg: rgba(0, 0, 0, 0.06);
  --toggle-hover: rgba(0, 0, 0, 0.1);
  --roll-bg: #e8eaef;
  --roll-grid: rgba(0, 0, 0, 0.06);
  --roll-c-grid: rgba(13, 159, 110, 0.2);
  --roll-label-light: #fff;
  --roll-label-dark: #3a3f50;
  --roll-key-light: #fff;
  --roll-key-dark: #d0d3dc;
  --roll-key-black: #b8bcc8;
  --roll-text: rgba(0, 0, 0, 0.45);
  --roll-border: rgba(0, 0, 0, 0.08);
  --roll-help: #5c6378;
  --tips-text: #3a3f50;
}

* {
  box-sizing: border-box;
}

body {
  min-height: 100vh;
  margin: 0;
  color: var(--text);
  background: var(--bg);
  transition: background 0.5s ease, color 0.5s ease;
}

.noise-overlay {
  position: fixed;
  inset: 0;
  z-index: 50;
  pointer-events: none;
  opacity: 0.03;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-repeat: repeat;
  background-size: 256px 256px;
}

[data-theme="light"] .noise-overlay { opacity: 0.015; }

.theme-toggle {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 60;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--toggle-bg);
  color: var(--text);
  font-size: 1.2rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(12px);
  transition: all 0.35s cubic-bezier(0.32, 0.72, 0, 1);
}

.theme-toggle:hover {
  background: var(--toggle-hover);
  transform: scale(1.1);
}

.theme-toggle:active {
  transform: scale(0.95);
}

.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.7s cubic-bezier(0.16, 1, 0.3, 1), transform 0.7s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

.layout {
  display: flex;
  gap: 24px;
  width: min(1200px, calc(100% - 48px));
  margin: 0 auto;
  padding: 48px 0 60px;
}

.main-content {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.tuner-panel {
  width: 260px;
  flex-shrink: 0;
  position: sticky;
  top: 32px;
  align-self: flex-start;
}

@media (min-width: 721px) {
  .tuner-panel .note-name {
    font-size: 3.8rem;
  }
  .tuner-panel .frequency {
    min-width: 0;
    font-size: 1.6rem;
    text-align: left;
    margin-top: 8px;
  }
  .tuner-panel .note-row {
    display: block;
  }
  .tuner-panel .tuner {
    margin: 24px 0 20px;
  }
  .tuner-panel .track {
    height: 48px;
  }
  .tuner-panel .needle {
    top: 6px;
    width: 5px;
    height: 36px;
  }
  .tuner-panel .details {
    grid-template-columns: 1fr;
    gap: 6px;
  }
  .tuner-panel .details div {
    padding: 12px;
    border-radius: 14px;
  }
  .tuner-panel .details strong {
    font-size: 0.92rem;
  }
}

.hero,
.meter-card,
.roll-card,
.tips {
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: var(--card);
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.34);
  border-radius: 28px;
}

.hero {
  padding: 40px;
}

.eyebrow,
.label {
  margin: 0;
  color: var(--muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 0.76rem;
}

h1 {
  max-width: 760px;
  margin: 10px 0 14px;
  font-size: clamp(2.3rem, 7vw, 5.6rem);
  line-height: 0.95;
  letter-spacing: -0.07em;
}

.intro {
  max-width: 720px;
  margin: 0;
  color: var(--text-sec);
  font-size: 1.08rem;
  line-height: 1.7;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

button {
  border: 0;
  border-radius: 999px;
  padding: 13px 22px;
  color: #07100d;
  background: var(--accent);
  font-weight: 800;
  cursor: pointer;
  transition: transform 0.35s cubic-bezier(0.32, 0.72, 0, 1), opacity 0.35s ease, background 0.35s ease, box-shadow 0.35s ease;
}

button:hover:not(:disabled) {
  transform: translateY(-2px) scale(1.02);
  box-shadow: 0 8px 28px -8px rgba(142, 255, 210, 0.35);
}

button:active:not(:disabled) {
  transform: translateY(0) scale(0.97);
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.45;
}

#stopButton {
  color: var(--text);
  background: var(--card-strong);
}

.status {
  min-height: 1.5em;
  margin: 18px 0 0;
  color: var(--muted);
}

.meter-card {
  padding: 34px;
}

.roll-card {
  margin-top: 22px;
  padding: 30px;
}

.section-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 18px;
}

.section-heading h2 {
  margin: 5px 0 0;
  font-size: clamp(1.45rem, 4vw, 2.2rem);
  letter-spacing: -0.04em;
}

#clearRollButton {
  color: var(--text);
  background: var(--card-strong);
}

.roll-wrap {
  position: relative;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 22px;
  background: var(--roll-bg);
}

#pitchRoll {
  display: block;
  width: 100%;
  height: min(68vh, 680px);
  min-height: 430px;
  cursor: crosshair;
}

.range-control {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 16px;
  color: var(--muted);
}

.range-control span {
  margin-right: 4px;
  font-size: 0.9rem;
  font-weight: 800;
}

.range-button {
  padding: 8px 12px;
  color: var(--text);
  background: rgba(255, 255, 255, 0.10);
  font-size: 0.9rem;
}

.range-button.active {
  color: #07100d;
  background: var(--accent);
}

.roll-help {
  margin: 14px 0 0;
  color: var(--muted);
  line-height: 1.6;
}

.note-row {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 20px;
}

.note-name {
  margin-top: 6px;
  font-size: clamp(4.5rem, 20vw, 12rem);
  line-height: 0.82;
  font-weight: 900;
  letter-spacing: -0.08em;
}

.frequency {
  min-width: 170px;
  text-align: right;
  color: var(--accent);
  font-size: clamp(2rem, 7vw, 4rem);
  font-weight: 850;
}

.frequency small {
  display: block;
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 700;
}

.tuner {
  margin: 36px 0 28px;
}

.scale {
  display: flex;
  justify-content: space-between;
  color: var(--muted);
  font-size: 0.8rem;
  margin-bottom: 9px;
}

.track {
  position: relative;
  height: 70px;
  border-radius: 999px;
  overflow: hidden;
  background: var(--track-bg);
}

.center-line {
  position: absolute;
  inset: 0 auto 0 50%;
  width: 3px;
  background: var(--needle-glow);
  transform: translateX(-50%);
  opacity: 0.3;
}

.needle {
  position: absolute;
  top: 9px;
  left: 50%;
  width: 10px;
  height: 52px;
  border-radius: 999px;
  background: var(--text);
  box-shadow: 0 0 24px var(--needle-glow);
  transform: translateX(-50%);
  transition: left 0.1s cubic-bezier(0.32, 0.72, 0, 1);
}

.cents {
  min-height: 1.4em;
  margin: 14px 0 0;
  color: var(--text);
  text-align: center;
  font-size: 1.1rem;
  font-weight: 800;
}

.details {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.details div {
  padding: 18px;
  border-radius: 20px;
  background: var(--detail-bg);
}

.details strong {
  display: block;
  margin-top: 7px;
  font-size: 1.1rem;
}

.tips {
  margin-top: 22px;
  padding: 28px 34px;
}

.tips h2 {
  margin: 0 0 12px;
  font-size: 1.2rem;
}

.tips ul {
  margin: 0;
  padding-left: 20px;
  color: var(--tips-text);
  line-height: 1.8;
}

.site-footer {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 16px;
  padding: 40px 0 32px;
  color: var(--muted);
  font-size: 0.82rem;
}

.site-footer a {
  color: var(--muted);
  text-decoration: none;
  transition: color 0.25s cubic-bezier(0.32, 0.72, 0, 1);
}

.site-footer a:hover {
  color: var(--accent);
}

@media (max-width: 720px) {
  body {
    padding-bottom: calc(150px + env(safe-area-inset-bottom));
  }

  .layout {
    flex-direction: column;
    width: min(100% - 20px, 1080px);
    padding: 20px 0;
    gap: 16px;
  }

  .tuner-panel {
    width: 100%;
    position: fixed;
    z-index: 12;
    left: 10px;
    right: 10px;
    bottom: calc(10px + env(safe-area-inset-bottom));
    top: auto;
  }

  .hero,
  .meter-card,
  .roll-card,
  .tips {
    border-radius: 22px;
  }

  .hero,
  .roll-card {
    padding: 24px;
  }

  .meter-card {
    padding: 12px;
    border-radius: 20px;
  }

  .section-heading {
    display: block;
  }

  #clearRollButton {
    margin-top: 14px;
  }

  #pitchRoll {
    height: 360px;
    min-height: 360px;
  }

  .note-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
  }

  .note-name {
    margin-top: 4px;
    font-size: 2.7rem;
  }

  .frequency {
    min-width: 88px;
    margin-top: 0;
    text-align: right;
    font-size: 1.25rem;
  }

  .meter-card .frequency small {
    font-size: 0.7rem;
  }

  .meter-card .tuner {
    margin: 10px 0 0;
  }

  .meter-card .scale {
    display: none;
  }

  .meter-card .track {
    height: 30px;
  }

  .meter-card .needle {
    top: 5px;
    width: 6px;
    height: 20px;
  }

  .meter-card .cents {
    min-height: 1.2em;
    margin: 7px 0 0;
    font-size: 0.88rem;
  }

  .meter-card .details {
    display: none;
  }
}