:root {
  --paper: #f7f7f4;
  --ink: #20241f;
  --muted: #8a9384;
  --faint: #b6bdad;
  --line: #e4e7de;
  --line-strong: #cdd3c4;
  --danger: #9b3d35;
  --ok: #3d6a46;
}

* { box-sizing: border-box; }

html, body { height: 100%; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 15px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }

button, input, select { font: inherit; color: inherit; }

::selection { background: #dfe4d6; }

/* ---------- top bar ---------- */

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 34px 48px 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
}

.brand-mark {
  width: 18px;
  height: 18px;
  border: 1px solid var(--ink);
  border-radius: 50%;
  position: relative;
}

.brand-mark::after {
  content: "";
  position: absolute;
  inset: 5px;
  border-radius: 50%;
  background: var(--ink);
}

.brand-name {
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.06em;
}

.topbar-link {
  font-size: 12px;
  color: var(--muted);
  letter-spacing: 0.04em;
  transition: color 0.2s ease;
}

.topbar-link span { margin-left: 4px; }
.topbar-link:hover { color: var(--ink); }

/* ---------- layout ---------- */

.page {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 32px 120px;
}

.intro { padding-top: 76px; }

.eyebrow {
  margin: 0 0 22px;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--faint);
}

.display {
  margin: 0;
  font-family: "Songti SC", "Noto Serif SC", "Source Han Serif SC", "STSong", serif;
  font-weight: 500;
  font-size: 56px;
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.lede {
  margin: 22px 0 0;
  max-width: 44ch;
  font-size: 15px;
  line-height: 1.9;
  color: var(--muted);
}

/* ---------- gate ---------- */

.gate {
  margin-top: 72px;
  padding-top: 28px;
  border-top: 1px solid var(--line);
}

.gate-label {
  display: block;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--faint);
  margin-bottom: 14px;
}

.gate-row {
  display: flex;
  align-items: center;
  gap: 18px;
}

.gate-row input {
  flex: 1;
  min-width: 0;
  border: 0;
  border-bottom: 1px solid var(--line-strong);
  background: transparent;
  padding: 10px 0;
  font-size: 16px;
  outline: none;
  transition: border-color 0.2s ease;
}

.gate-row input:focus { border-color: var(--ink); }

.gate-error {
  margin: 14px 0 0;
  font-size: 13px;
  color: var(--danger);
}

/* ---------- drop zone ---------- */

.drop {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
  margin-top: 56px;
  padding: 68px 24px;
  border: 1px dashed var(--line-strong);
  border-radius: 3px;
  cursor: pointer;
  text-align: center;
  transition: border-color 0.25s ease, background-color 0.25s ease;
}

.drop:hover,
.drop:focus-visible,
.drop.is-drag {
  border-color: var(--ink);
  background: #fbfbf8;
  outline: none;
}

.drop-plus {
  font-size: 26px;
  line-height: 1;
  color: var(--faint);
  margin-bottom: 10px;
  transition: color 0.25s ease;
}

.drop.is-drag .drop-plus,
.drop:hover .drop-plus { color: var(--ink); }

.drop-title { font-size: 16px; }

.drop-or {
  font-size: 13px;
  color: var(--muted);
}

.drop-hint {
  margin-top: 18px;
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--faint);
}

/* ---------- queue ---------- */

.queue { margin-top: 8px; }

.card {
  display: grid;
  grid-template-columns: 92px minmax(0, 1fr) auto;
  gap: 24px;
  padding: 28px 0;
  border-top: 1px solid var(--line);
  align-items: start;
}

.queue .card:first-child { border-top: 0; }

.card-cover {
  position: relative;
  width: 92px;
  aspect-ratio: 3 / 4;
  border-radius: 2px;
  overflow: hidden;
  background: #edeee7;
}

.card-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.card-cover img.is-ready { opacity: 1; }

.card-cover-empty {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--faint);
}

.card-body { min-width: 0; padding-top: 2px; }

.card-title {
  width: 100%;
  border: 0;
  border-bottom: 1px solid transparent;
  background: transparent;
  padding: 0 0 6px;
  font-size: 19px;
  font-weight: 500;
  letter-spacing: -0.01em;
  outline: none;
  transition: border-color 0.2s ease;
}

.card-title:focus { border-color: var(--ink); }

.card-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 10px;
  font-size: 12px;
  color: var(--muted);
}

.card-category {
  appearance: none;
  -webkit-appearance: none;
  border: 0;
  background: transparent;
  padding: 0 14px 0 0;
  font-size: 12px;
  color: var(--muted);
  cursor: pointer;
  outline: none;
  background-image: linear-gradient(45deg, transparent 50%, var(--muted) 50%), linear-gradient(135deg, var(--muted) 50%, transparent 50%);
  background-position: calc(100% - 6px) 7px, calc(100% - 2px) 7px;
  background-size: 4px 4px, 4px 4px;
  background-repeat: no-repeat;
}

.card-category:hover { color: var(--ink); }

.card-track {
  height: 2px;
  margin-top: 18px;
  background: #e8ebe2;
  overflow: hidden;
}

.card-fill {
  display: block;
  height: 100%;
  width: 0;
  background: var(--ink);
  transition: width 0.3s ease;
}

.card-status {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  margin-top: 9px;
  font-size: 12px;
  color: var(--muted);
}

.card-speed { font-variant-numeric: tabular-nums; }

.card.is-error .card-state { color: var(--danger); }
.card.is-done .card-state { color: var(--ok); }
.card.is-error .card-fill { background: var(--danger); }

.card-actions {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 8px;
  padding-top: 2px;
}

/* ---------- buttons ---------- */

.btn {
  border: 0;
  background: none;
  cursor: pointer;
  transition: opacity 0.2s ease, color 0.2s ease, background-color 0.2s ease, border-color 0.2s ease;
}

.btn:disabled { opacity: 0.35; cursor: default; }

.btn-solid {
  padding: 11px 26px;
  border-radius: 999px;
  background: var(--ink);
  color: #fff;
  font-size: 13px;
  letter-spacing: 0.04em;
}

.btn-solid:hover:not(:disabled) { background: #000; }

.btn-ghost {
  padding: 0;
  font-size: 12px;
  color: var(--muted);
  border-bottom: 1px solid transparent;
}

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

/* ---------- misc ---------- */

.empty-note {
  display: flex;
  align-items: center;
  gap: 18px;
  margin-top: 44px;
  font-size: 12px;
  color: var(--faint);
}

.empty-note .rule {
  flex: 0 0 40px;
  height: 1px;
  background: var(--line-strong);
}

.foot {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-top: 96px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--faint);
}

.foot-dim { font-variant-numeric: tabular-nums; }

@media (max-width: 640px) {
  .topbar { padding: 24px 22px 0; }
  .page { padding: 0 22px 80px; }
  .intro { padding-top: 48px; }
  .display { font-size: 40px; }
  .drop { margin-top: 40px; padding: 48px 18px; }
  .card { grid-template-columns: 68px minmax(0, 1fr); gap: 16px; }
  .card-cover { width: 68px; }
  .card-actions { grid-column: 1 / -1; flex-direction: row; justify-content: flex-end; }
  .foot { margin-top: 64px; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
}