:root {
  --bg0: #070912;
  --bg1: #0f1733;
  --card: rgba(250, 246, 238, 0.92);
  --card2: rgba(250, 246, 238, 0.75);
  --ink: #14172e;
  --muted: rgba(20, 23, 46, 0.62);
  --hair: rgba(20, 23, 46, 0.18);

  --accent: #2fb7a1;
  --accent2: #f0a46a;
  --danger: #e04b4b;

  --shadow: rgba(0, 0, 0, 0.25);
  --radius: 18px;

  --display: "Batang", "Palatino Linotype", Palatino, serif;
  --body: "Malgun Gothic", "Segoe UI", sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono",
    "Courier New", monospace;
}

* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
}

body {
  margin: 0;
  color: var(--ink);
  font-family: var(--body);
  background: var(--bg0);
  overflow-x: hidden;
}

.bg {
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(900px 520px at 14% 6%, rgba(104, 203, 255, 0.28), transparent 62%),
    radial-gradient(800px 520px at 78% 12%, rgba(255, 195, 120, 0.18), transparent 62%),
    radial-gradient(920px 820px at 50% 88%, rgba(135, 102, 255, 0.14), transparent 62%),
    linear-gradient(180deg, var(--bg1), var(--bg0));
  filter: saturate(1.06) contrast(1.06);
}

.bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    repeating-linear-gradient(
      135deg,
      rgba(255, 255, 255, 0.03) 0px,
      rgba(255, 255, 255, 0.03) 1px,
      transparent 1px,
      transparent 9px
    );
  opacity: 0.5;
}

.page {
  max-width: 1200px;
  margin: 0 auto;
  padding: 22px 18px 42px;
}

.hero {
  display: flex;
  gap: 18px;
  align-items: stretch;
  animation: rise 520ms ease-out both;
}

.hero-left {
  flex: 1.1;
  padding: 22px 22px 18px;
  border-radius: var(--radius);
  background: var(--card);
  box-shadow: 0 18px 55px var(--shadow);
  border: 1px solid rgba(255, 255, 255, 0.45);
}

.hero-right {
  flex: 1;
}

.eyebrow {
  margin: 0 0 8px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-size: 12px;
  color: var(--muted);
}

h1 {
  margin: 0;
  font-family: var(--display);
  font-weight: 700;
  font-size: clamp(30px, 4.2vw, 44px);
  line-height: 1.1;
}

.subtitle {
  margin: 10px 0 14px;
  color: var(--muted);
}

.hint {
  margin: 14px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.live {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  margin-top: 14px;
}

.live-item {
  display: grid;
  grid-template-columns: 88px 1fr auto;
  gap: 10px;
  align-items: center;
}

.live-item .meter {
  grid-column: 2 / 4;
}

.live-label {
  font-size: 12px;
  color: var(--muted);
}

.live-value {
  font-size: 16px;
}

.live-conf {
  font-size: 12px;
  color: var(--muted);
}

.meter {
  height: 8px;
  border-radius: 999px;
  background: rgba(20, 23, 46, 0.1);
  overflow: hidden;
}

.meter-bar {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--accent), rgba(47, 183, 161, 0.2));
}

.panel {
  height: 100%;
  padding: 18px 18px 14px;
  border-radius: var(--radius);
  background: var(--card2);
  box-shadow: 0 18px 55px var(--shadow);
  border: 1px solid rgba(255, 255, 255, 0.42);
  backdrop-filter: blur(8px);
  animation: rise 620ms ease-out 60ms both;
}

.row {
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
}

.divider {
  height: 1px;
  margin: 14px 0;
  background: var(--hair);
}

.btn {
  appearance: none;
  border: 1px solid rgba(20, 23, 46, 0.18);
  background: rgba(255, 255, 255, 0.65);
  color: var(--ink);
  border-radius: 999px;
  padding: 10px 14px;
  font-size: 13px;
  letter-spacing: 0.02em;
  cursor: pointer;
  transition: transform 90ms ease, background 120ms ease, border-color 120ms ease;
}

.btn:hover {
  background: rgba(255, 255, 255, 0.85);
}

.btn:active {
  transform: translateY(1px);
}

.btn.primary {
  background: linear-gradient(135deg, var(--accent), rgba(47, 183, 161, 0.65));
  border-color: rgba(47, 183, 161, 0.35);
  color: #04110e;
  font-weight: 700;
}

.btn.ghost {
  background: rgba(20, 23, 46, 0.06);
}

.btn.danger {
  background: linear-gradient(135deg, var(--danger), rgba(224, 75, 75, 0.65));
  border-color: rgba(224, 75, 75, 0.35);
  color: #210808;
  font-weight: 700;
}

.toggle {
  display: inline-flex;
  gap: 8px;
  align-items: center;
  padding: 8px 10px;
  border-radius: 999px;
  background: rgba(20, 23, 46, 0.06);
  border: 1px solid rgba(20, 23, 46, 0.12);
  cursor: pointer;
  user-select: none;
}

.toggle input {
  accent-color: var(--accent);
}

.row.slider {
  width: 100%;
  flex-direction: column;
  align-items: stretch;
  gap: 6px;
}

.slider-label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
  color: var(--muted);
}

.strength {
  width: 100%;
}

.strength:disabled {
  opacity: 0.55;
}

.seek {
  margin-top: 10px;
}

.seekbar {
  width: 100%;
}

.meta {
  justify-content: space-between;
  width: 100%;
}

.time {
  font-size: 13px;
}

.micro {
  font-size: 12px;
  color: var(--muted);
}

.note {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.45;
}

.layout {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 18px;
  margin-top: 18px;
}

.cards,
.piano {
  padding: 18px;
  border-radius: var(--radius);
  background: rgba(250, 246, 238, 0.88);
  border: 1px solid rgba(255, 255, 255, 0.42);
  box-shadow: 0 18px 55px var(--shadow);
  backdrop-filter: blur(10px);
}

.cards-head,
.piano-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
}

h2 {
  margin: 0;
  font-family: var(--display);
  font-size: 22px;
}

.dim {
  color: var(--muted);
}

.sections {
  display: grid;
  gap: 12px;
  margin-top: 14px;
}

.section-card {
  border-radius: 16px;
  border: 1px solid rgba(20, 23, 46, 0.12);
  background: rgba(255, 255, 255, 0.72);
  padding: 14px 14px 12px;
}

.section-card.active {
  border-color: rgba(47, 183, 161, 0.55);
  box-shadow: 0 14px 30px rgba(47, 183, 161, 0.18);
}

.section-head {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  align-items: center;
}

.section-title {
  display: flex;
  gap: 10px;
  align-items: baseline;
}

.section-title .name {
  font-weight: 800;
  letter-spacing: 0.02em;
}

.section-title .times {
  font-size: 12px;
  color: var(--muted);
}

.lyrics {
  margin-top: 10px;
  display: grid;
  gap: 4px;
}

.line {
  font-size: 14px;
  line-height: 1.5;
}

.chords {
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px dashed rgba(20, 23, 46, 0.22);
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 2px;
}

.chords.empty::before {
  content: "(코드가 아직 없습니다)";
  color: rgba(20, 23, 46, 0.45);
  font-size: 12px;
}

.chip {
  border: 1px solid rgba(20, 23, 46, 0.12);
  background: rgba(255, 255, 255, 0.78);
  border-radius: 999px;
  padding: 8px 10px;
  font-size: 12px;
  cursor: pointer;
  white-space: nowrap;
  transition: background 120ms ease, transform 90ms ease;
}

.chip:hover {
  background: rgba(255, 255, 255, 0.92);
}

.chip:active {
  transform: translateY(1px);
}

.chip.active {
  border-color: rgba(47, 183, 161, 0.55);
  box-shadow: 0 10px 22px rgba(47, 183, 161, 0.18);
}

.chip .small {
  margin-left: 6px;
  color: rgba(20, 23, 46, 0.52);
}

.kb {
  margin-top: 14px;
}

.kb-title {
  display: flex;
  gap: 10px;
  align-items: center;
  margin-bottom: 8px;
}

.tag {
  font-size: 11px;
  letter-spacing: 0.12em;
  font-weight: 900;
  padding: 4px 10px;
  border-radius: 999px;
  border: 1px solid rgba(20, 23, 46, 0.14);
}

.tag.left {
  background: rgba(47, 183, 161, 0.18);
}

.tag.right {
  background: rgba(240, 164, 106, 0.22);
}

.keyboard {
  width: 100%;
  border-radius: 16px;
  border: 1px solid rgba(20, 23, 46, 0.12);
  background: rgba(255, 255, 255, 0.75);
  padding: 12px;
  overflow: hidden;
}

.keyboard svg {
  width: 100%;
  height: auto;
  display: block;
}

.key.white {
  fill: rgba(255, 255, 255, 0.92);
  stroke: rgba(20, 23, 46, 0.32);
  stroke-width: 1;
}

.key.black {
  fill: rgba(14, 16, 29, 0.92);
  stroke: rgba(255, 255, 255, 0.08);
  stroke-width: 1;
}

.key.active-left.white {
  fill: rgba(47, 183, 161, 0.34);
}

.key.active-left.black {
  fill: rgba(47, 183, 161, 0.88);
}

.key.active-right.white {
  fill: rgba(240, 164, 106, 0.42);
}

.key.active-right.black {
  fill: rgba(240, 164, 106, 0.9);
}

.fineprint {
  margin-top: 14px;
  font-size: 12px;
}

.footer {
  margin-top: 18px;
  color: rgba(255, 255, 255, 0.7);
  text-align: right;
}

.mono {
  font-family: var(--mono);
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 980px) {
  .hero {
    flex-direction: column;
  }

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

  .footer {
    text-align: left;
  }
}