:root {
  --bg: #07070c;
  --bg-2: #10121a;
  --panel: rgba(12, 14, 22, 0.78);
  --stroke: rgba(168, 255, 232, 0.16);
  --stroke-strong: rgba(168, 255, 232, 0.38);
  --cyan: #7dffd8;
  --cyan-dim: #2aa889;
  --pink: #ff4d9a;
  --yellow: #ffd24a;
  --hold: #7ecbff;
  --text: #f3f6ff;
  --muted: #8d94ab;
  --danger: #ff6b7a;
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.45);
  --font: "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  --mono: "Cascadia Mono", "JetBrains Mono", "Sarasa Mono SC", "Consolas", monospace;
  --cover: none;
  --radius: 18px;
}

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

html,
body {
  margin: 0;
  min-height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.55;
}

body {
  min-height: 100vh;
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: -8%;
  background:
    linear-gradient(180deg, rgba(7, 7, 12, 0.35), rgba(7, 7, 12, 0.88)),
    var(--cover) center / cover no-repeat;
  filter: blur(28px) saturate(1.35);
  opacity: 0.28;
  pointer-events: none;
  z-index: 0;
  transform: scale(1.08);
}

body::after {
  content: "";
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(125, 255, 216, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(125, 255, 216, 0.035) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse at 50% 20%, #000 20%, transparent 75%);
  pointer-events: none;
  z-index: 0;
}

.page {
  position: relative;
  z-index: 1;
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
  padding: 28px 0 64px;
}

.topbar {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 28px;
}

.brand {
  display: flex;
  gap: 14px;
  align-items: center;
}

.logo {
  width: 52px;
  height: 52px;
  flex: none;
  display: grid;
  place-items: center;
  border: 1px solid var(--stroke-strong);
  background: linear-gradient(160deg, rgba(125, 255, 216, 0.16), rgba(255, 77, 154, 0.08));
  box-shadow: 0 0 24px rgba(125, 255, 216, 0.12);
}

.logo svg {
  width: 28px;
  height: 28px;
}

.brand h1 {
  margin: 0;
  font-size: 22px;
  font-weight: 720;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.brand p {
  margin: 2px 0 0;
  color: var(--muted);
  font-size: 13px;
  letter-spacing: 0.08em;
}

.layout {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 1.15fr);
  gap: 18px;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--stroke);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}

.panel-inner {
  padding: 20px;
}

.drop {
  position: relative;
  min-height: 280px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 28px 20px;
  border: 1px dashed var(--stroke-strong);
  background:
    repeating-linear-gradient(
      -18deg,
      transparent,
      transparent 10px,
      rgba(125, 255, 216, 0.025) 10px,
      rgba(125, 255, 216, 0.025) 12px
    );
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s, transform 0.2s;
}

.drop:hover,
.drop.is-over {
  border-color: var(--cyan);
  background-color: rgba(125, 255, 216, 0.05);
}

.drop.is-over {
  transform: scale(1.01);
}

.drop h2 {
  margin: 0;
  font-size: 20px;
  font-weight: 650;
}

.drop p {
  margin: 0;
  color: var(--muted);
  text-align: center;
  max-width: 36em;
}

.drop .hint {
  font-size: 12px;
  letter-spacing: 0.08em;
}

.file-btn {
  appearance: none;
  border: 0;
  background: var(--cyan);
  color: #041410;
  font-weight: 700;
  padding: 10px 16px;
  letter-spacing: 0.08em;
  cursor: pointer;
}

.file-btn:hover {
  filter: brightness(1.06);
}

.hidden-input {
  display: none;
}

.file-chip {
  display: none;
  margin-top: 14px;
  padding: 10px 12px;
  border: 1px solid var(--stroke);
  background: rgba(0, 0, 0, 0.28);
  font-family: var(--mono);
  font-size: 12px;
  color: var(--muted);
  word-break: break-all;
}

.file-chip.is-on {
  display: block;
}

.section-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin: 0 0 14px;
  font-size: 13px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}

.meta-head {
  display: grid;
  grid-template-columns: 92px 1fr;
  gap: 14px;
  margin-bottom: 18px;
}

.cover {
  width: 92px;
  height: 92px;
  object-fit: cover;
  background: #151821;
  border: 1px solid var(--stroke);
}

.cover.placeholder {
  display: grid;
  place-items: center;
  color: var(--muted);
  font-size: 11px;
  letter-spacing: 0.12em;
}

.song-title {
  margin: 0;
  font-size: 20px;
  line-height: 1.25;
}

.song-sub {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.pills {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 10px;
}

.pill {
  padding: 3px 8px;
  border: 1px solid var(--stroke);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.counts {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin: 12px 0 16px;
}

.count {
  padding: 10px 12px;
  border: 1px solid var(--stroke);
  background: rgba(0, 0, 0, 0.22);
}

.count b {
  display: block;
  font-size: 22px;
  font-variant-numeric: tabular-nums;
  line-height: 1.1;
}

.count span {
  color: var(--muted);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.count.tap b { color: var(--cyan); }
.count.drag b { color: var(--yellow); }
.count.hold b { color: var(--hold); }
.count.flick b { color: var(--pink); }

.bars {
  display: flex;
  align-items: flex-end;
  gap: 2px;
  height: 56px;
  margin: 8px 0 18px;
  padding: 8px 8px 0;
  border: 1px solid var(--stroke);
  background: rgba(0, 0, 0, 0.28);
}

.bars i {
  flex: 1;
  min-width: 2px;
  background: linear-gradient(180deg, var(--cyan), rgba(125, 255, 216, 0.15));
  opacity: 0.9;
}

.bars.empty::after {
  content: "尚未载入谱面";
  color: var(--muted);
  font-size: 12px;
  margin: auto;
  padding-bottom: 10px;
}

.options {
  display: grid;
  gap: 12px;
}

.opt-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.check {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 10px;
  border: 1px solid var(--stroke);
  background: rgba(0, 0, 0, 0.2);
  cursor: pointer;
  user-select: none;
}

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

.hold-modes {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 8px;
}

.mode {
  cursor: pointer;
  padding: 10px;
  border: 1px solid var(--stroke);
  background: rgba(0, 0, 0, 0.22);
  min-height: 92px;
}

.mode input {
  display: none;
}

.mode strong {
  display: block;
  margin-bottom: 4px;
}

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

.mode:has(input:checked),
.mode.is-on {
  border-color: var(--cyan);
  box-shadow: inset 0 0 0 1px var(--cyan);
  background: rgba(125, 255, 216, 0.06);
}

.flow {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 6px;
}

.nt {
  padding: 4px 9px;
  border: 1px solid var(--stroke);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.nt.drag { color: var(--yellow); border-color: rgba(255, 210, 74, 0.45); }
.nt.hold { color: var(--hold); border-color: rgba(126, 203, 255, 0.45); }
.nt.flick { color: var(--pink); border-color: rgba(255, 77, 154, 0.45); }
.nt.tap {
  color: #041410;
  background: var(--cyan);
  border-color: var(--cyan);
  font-weight: 700;
}

.flow-keep {
  padding: 4px 9px;
  border: 1px solid rgba(126, 203, 255, 0.45);
  color: var(--hold);
  font-size: 11px;
  letter-spacing: 0.14em;
}

.hold-block.is-off {
  opacity: 0.42;
  pointer-events: none;
}

.fill-row {
  display: none;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.fill-row.is-on {
  display: flex;
}

select {
  background: #0c0e14;
  color: var(--text);
  border: 1px solid var(--stroke-strong);
  padding: 8px 10px;
  font: inherit;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 16px;
}

.btn {
  appearance: none;
  border: 1px solid var(--stroke);
  background: transparent;
  color: var(--text);
  padding: 12px 16px;
  font-weight: 700;
  letter-spacing: 0.08em;
  cursor: pointer;
}

.btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.btn-primary {
  background: var(--cyan);
  color: #041410;
  border-color: var(--cyan);
  flex: 1;
}

.btn-primary:hover:not(:disabled) {
  filter: brightness(1.05);
}

.btn:hover:not(:disabled) {
  border-color: var(--cyan);
}

.status {
  min-height: 1.5em;
  margin-top: 12px;
  color: var(--muted);
  font-size: 13px;
}

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

.status.ok {
  color: var(--cyan);
}

.after-line {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  margin-top: 8px;
  padding-top: 10px;
  border-top: 1px solid var(--stroke);
  font-variant-numeric: tabular-nums;
}

.charts {
  margin-top: 12px;
  display: none;
}

.charts.is-on {
  display: block;
}

.chart-pick {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.help {
  margin-top: 18px;
  padding: 14px 16px;
  border-left: 3px solid var(--cyan);
  background: rgba(0, 0, 0, 0.22);
  color: var(--muted);
  font-size: 13px;
}

.help b {
  color: var(--text);
}

.player {
  display: none;
  margin-top: 12px;
}

.player.is-on {
  display: block;
}

.player audio {
  width: 100%;
  height: 32px;
}

.empty-meta .meta-head,
.empty-meta .counts,
.empty-meta .bars,
.empty-meta .after-line,
.empty-meta .charts,
.empty-meta .player {
  opacity: 0.5;
  pointer-events: none;
}

@media (max-width: 860px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .hold-modes {
    grid-template-columns: 1fr;
  }

  .brand h1 {
    letter-spacing: 0.1em;
    font-size: 18px;
  }

  .topbar {
    flex-direction: column;
  }
}