/* ============ Playlist Pruner — Spotify-flavoured dark theme ============ */
:root {
  --bg: #121212;
  --bg-elevated: #181818;
  --bg-hover: #242424;
  --bg-press: #2a2a2a;
  --border: #2a2a2a;
  --green: #1db954;
  --green-bright: #1ed760;
  --green-dark: #169c46;
  --text: #ffffff;
  --text-sub: #b3b3b3;
  --text-faint: #6a6a6a;
  --danger: #e91429;
  --radius: 10px;
  --shadow: 0 8px 24px rgba(0, 0, 0, 0.5);
  font-size: 16px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  background-image: radial-gradient(ellipse 80% 50% at 50% -10%, rgba(29, 185, 84, 0.10), transparent);
  color: var(--text);
  font-family: "Circular Std", -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  min-height: 100vh;
}

a { color: var(--green-bright); }
code {
  background: #000;
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.85em;
  word-break: break-all;
}
kbd {
  background: var(--bg-hover);
  border: 1px solid var(--border);
  border-bottom-width: 2px;
  border-radius: 4px;
  padding: 1px 6px;
  font-size: 0.8em;
}
.hidden { display: none !important; }
.muted { color: var(--text-sub); font-size: 0.9rem; }

/* ============ Top bar ============ */
.topbar {
  display: flex;
  align-items: center;
  gap: 2rem;
  padding: 0.9rem 1.5rem;
  background: rgba(0, 0, 0, 0.65);
  backdrop-filter: blur(8px);
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid var(--border);
}
.logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--green);
}
.logo h1 {
  font-size: 1.15rem;
  margin: 0;
  color: var(--text);
  letter-spacing: -0.02em;
}
.logo h1 span { color: var(--green-bright); }

.nav { display: flex; gap: 0.4rem; }
.nav-btn {
  background: transparent;
  border: none;
  color: var(--text-sub);
  font: inherit;
  font-weight: 600;
  padding: 0.5rem 1rem;
  border-radius: 999px;
  cursor: pointer;
  transition: color 0.15s, background 0.15s;
}
.nav-btn:hover:not(:disabled) { color: var(--text); }
.nav-btn.active { background: var(--bg-hover); color: var(--green-bright); }
.nav-btn:disabled { opacity: 0.35; cursor: not-allowed; }

.session-info {
  margin-left: auto;
  color: var(--text-faint);
  font-size: 0.8rem;
}

/* ============ Layout ============ */
main { max-width: 1100px; margin: 0 auto; padding: 2rem 1.5rem 4rem; }
.screen { display: none; }
.screen.active { display: block; animation: fadeIn 0.25s ease; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; } }

.card {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
}

/* ============ Buttons ============ */
.btn {
  font: inherit;
  font-weight: 700;
  border: none;
  border-radius: 999px;
  padding: 0.65rem 1.5rem;
  cursor: pointer;
  transition: transform 0.08s, background 0.15s, color 0.15s;
}
.btn:active { transform: scale(0.97); }
.btn-primary { background: var(--green); color: #000; }
.btn-primary:hover { background: var(--green-bright); }
.btn-ghost {
  background: transparent;
  color: var(--text-sub);
  border: 1px solid var(--text-faint);
}
.btn-ghost:hover:not(:disabled) { color: var(--text); border-color: var(--text); }
.btn-ghost:disabled { opacity: 0.4; cursor: not-allowed; }
.btn-tiny {
  background: var(--bg-hover);
  color: var(--text-sub);
  border-radius: 6px;
  padding: 2px 8px;
  font-size: 0.75rem;
  font-weight: 600;
}
.btn-tiny:hover { color: var(--text); }

/* ============ Import screen ============ */
.hero { text-align: center; margin-bottom: 2rem; }
.hero h2 { font-size: 2rem; margin: 0 0 0.5rem; letter-spacing: -0.03em; }
.hero p { color: var(--text-sub); max-width: 560px; margin: 0 auto; }

.resume-banner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  background: linear-gradient(90deg, rgba(29, 185, 84, 0.18), var(--bg-elevated));
  border: 1px solid var(--green-dark);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
  margin-bottom: 1.5rem;
}
.resume-banner strong { display: block; }
.resume-banner span { color: var(--text-sub); font-size: 0.85rem; }
.resume-actions { display: flex; gap: 0.5rem; }

.import-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.25rem;
  align-items: start;
}
.import-card h3 { margin-top: 0; display: flex; align-items: center; gap: 0.5rem; }
.badge {
  background: var(--green);
  color: #000;
  font-size: 0.65rem;
  font-weight: 800;
  text-transform: uppercase;
  padding: 2px 8px;
  border-radius: 999px;
}

.field { display: block; margin-bottom: 0.9rem; }
.field span {
  display: block;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-sub);
  margin-bottom: 0.3rem;
}
input[type="text"], textarea {
  width: 100%;
  background: #000;
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  font: inherit;
  padding: 0.6rem 0.75rem;
}
input[type="text"]:focus, textarea:focus {
  outline: none;
  border-color: var(--green);
}
textarea { resize: vertical; margin-bottom: 0.75rem; }

.help { margin: 0.75rem 0 1rem; font-size: 0.85rem; color: var(--text-sub); }
.help summary { cursor: pointer; color: var(--green-bright); }
.help ol { padding-left: 1.2rem; }
.help li { margin: 0.4rem 0; }

.connected-as { color: var(--text-sub); font-size: 0.9rem; }
.connected-as strong { color: var(--green-bright); }

.divider {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--text-faint);
  font-size: 0.8rem;
  margin: 1rem 0;
}
.divider::before, .divider::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--border);
}

.playlist-picker { max-height: 260px; overflow-y: auto; }
.playlist-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  width: 100%;
  background: transparent;
  border: none;
  color: var(--text);
  font: inherit;
  text-align: left;
  padding: 0.5rem;
  border-radius: 6px;
  cursor: pointer;
}
.playlist-item:hover { background: var(--bg-hover); }
.playlist-item img, .playlist-item .ph {
  width: 40px;
  height: 40px;
  border-radius: 4px;
  object-fit: cover;
  background: var(--bg-hover);
  flex-shrink: 0;
}
.playlist-item .pl-meta { overflow: hidden; }
.playlist-item .pl-name { display: block; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.playlist-item .pl-count { font-size: 0.75rem; color: var(--text-faint); }

.dropzone {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 2rem 1rem;
  color: var(--text-sub);
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
}
.dropzone:hover, .dropzone.dragover {
  border-color: var(--green);
  background: rgba(29, 185, 84, 0.06);
}
.dz-icon { font-size: 1.6rem; color: var(--green); }

/* ============ Battle screen ============ */
.battle-header {
  display: flex;
  align-items: center;
  gap: 2rem;
  flex-wrap: wrap;
  margin-bottom: 1.5rem;
}
.battle-header h2 { margin: 0; font-size: 1.3rem; flex: 1 1 100%; }

.progress-wrap { flex: 1; min-width: 220px; }
.progress-label {
  display: flex;
  justify-content: space-between;
  font-size: 0.8rem;
  color: var(--text-sub);
  margin-bottom: 0.3rem;
}
#confidence-pct { color: var(--green-bright); font-weight: 700; }
.progress-bar {
  height: 6px;
  background: var(--bg-hover);
  border-radius: 999px;
  overflow: hidden;
}
.progress-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--green-dark), var(--green-bright));
  border-radius: 999px;
  transition: width 0.4s ease;
}

.battle-stats { display: flex; gap: 1.5rem; }
.stat { text-align: center; }
.stat span { display: block; font-size: 1.3rem; font-weight: 800; color: var(--green-bright); }
.stat label { font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--text-faint); }

.arena {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 1.5rem;
  align-items: center;
  margin-bottom: 1rem;
}
@media (max-width: 720px) {
  .arena { grid-template-columns: 1fr; }
  .vs { order: 3; }
}

.contender {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  cursor: pointer;
  color: var(--text);
  font: inherit;
  text-align: left;
  transition: transform 0.12s, border-color 0.15s, box-shadow 0.15s;
}
.contender:hover {
  transform: translateY(-4px);
  border-color: var(--green);
  box-shadow: var(--shadow);
}
.contender.winner { animation: winPulse 0.35s ease; border-color: var(--green-bright); }
@keyframes winPulse {
  0% { box-shadow: 0 0 0 0 rgba(30, 215, 96, 0.6); }
  100% { box-shadow: 0 0 0 18px rgba(30, 215, 96, 0); }
}

.art-wrap { position: relative; }
.play-btn {
  position: absolute;
  bottom: 0.75rem;
  right: 0.75rem;
  width: 48px;
  height: 48px;
  border: none;
  border-radius: 50%;
  background: var(--green);
  color: #000;
  font-size: 1.1rem;
  line-height: 1;
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.5);
  transition: transform 0.1s, background 0.15s, opacity 0.15s;
  display: flex;
  align-items: center;
  justify-content: center;
}
.play-btn:hover { background: var(--green-bright); transform: scale(1.06); }
.play-btn.playing { background: var(--green-bright); }
.play-btn.loading { animation: pulse 0.8s ease infinite; }
.play-btn.unavailable {
  background: var(--bg-hover);
  color: var(--text-faint);
  cursor: default;
  opacity: 0.7;
}
@keyframes pulse { 50% { opacity: 0.5; } }

.play-btn-sm {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border-radius: 4px;
  background: rgba(0, 0, 0, 0.55);
  color: #fff;
  box-shadow: none;
  opacity: 0;
  font-size: 0.95rem;
}
.row-art-wrap { position: relative; width: 48px; height: 48px; }
.row-art-wrap:hover .play-btn-sm,
.play-btn-sm.playing, .play-btn-sm.loading { opacity: 1; }
.play-btn-sm:hover { background: rgba(0, 0, 0, 0.75); transform: none; }
.play-btn-sm.unavailable { background: rgba(0, 0, 0, 0.55); }

.contender .art {
  width: 100%;
  aspect-ratio: 1;
  border-radius: 8px;
  background-size: cover;
  background-position: center;
  background-color: var(--bg-hover);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  font-weight: 800;
  color: rgba(255, 255, 255, 0.85);
  text-shadow: 0 2px 8px rgba(0,0,0,0.6);
}
.contender .meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.6rem;
}
.contender .meta-text { display: flex; flex-direction: column; gap: 0.2rem; min-width: 0; }
.contender .title { font-weight: 700; font-size: 1.1rem; }
.contender .artist { color: var(--text-sub); font-size: 0.9rem; }

.keep-btn {
  background: transparent;
  border: none;
  color: var(--text-faint);
  font-size: 1.4rem;
  line-height: 1;
  cursor: pointer;
  padding: 0.2rem 0.4rem;
  transition: color 0.15s, transform 0.1s;
  flex-shrink: 0;
}
.keep-btn:hover { color: var(--green-bright); transform: scale(1.15); }
.keep-btn.kept { color: var(--green-bright); }
.key-hint {
  position: absolute;
  top: 0.75rem;
  right: 0.75rem;
  background: rgba(0, 0, 0, 0.55);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 2px 9px;
  font-size: 0.85rem;
  color: var(--text-sub);
}

.vs {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
}
.vs > span {
  font-size: 1.4rem;
  font-weight: 900;
  color: var(--green);
  letter-spacing: 0.1em;
}

/* 3 columns × 2 rows, filled column-first so each column reads as a
   unit: left song | similar verdicts | right song */
.grade-bar {
  display: grid;
  grid-template-rows: repeat(2, auto);
  grid-template-columns: repeat(3, minmax(0, 220px));
  grid-auto-flow: column;
  gap: 0.6rem;
  justify-content: center;
  margin-bottom: 1rem;
}
@media (max-width: 620px) {
  .grade-bar {
    grid-auto-flow: row;
    grid-template-columns: repeat(2, 1fr);
    grid-template-rows: none;
  }
}
.grade-btn {
  font: inherit;
  font-weight: 600;
  background: var(--bg-elevated);
  color: var(--text-sub);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.55rem 1.1rem;
  cursor: pointer;
  transition: border-color 0.15s, color 0.15s, transform 0.08s;
}
.grade-btn:hover { border-color: var(--green); color: var(--text); }
.grade-btn:active { transform: scale(0.96); }
.grade-btn kbd { margin-right: 0.35rem; }
.grade-btn.grade-good { border-color: var(--green-dark); }
.grade-btn.grade-good:hover { border-color: var(--green-bright); }
.grade-btn.grade-bad { border-color: #7a2730; }
.grade-btn.grade-bad:hover { border-color: var(--danger); color: var(--text); }

.kbd-help { text-align: center; color: var(--text-faint); font-size: 0.8rem; margin-bottom: 2rem; }

.movers h4 {
  margin: 0 0 0.75rem;
  text-transform: uppercase;
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--text-sub);
}
.movers ol { margin: 0 0 0.75rem; padding-left: 1.4rem; }
.movers li { padding: 0.2rem 0; color: var(--text-sub); }
.movers li strong { color: var(--text); font-weight: 600; }

/* ============ Rankings screen ============ */
.rankings-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 1.25rem;
}
.rankings-header h2 { margin: 0 0 0.25rem; }
.rankings-actions { display: flex; gap: 0.5rem; flex-wrap: wrap; }

.prune-bar {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 1.25rem;
  padding: 0.9rem 1.25rem;
}
.prune-bar label { font-size: 0.9rem; color: var(--text-sub); white-space: nowrap; }
.prune-bar strong { color: var(--green-bright); }
.prune-bar input[type="range"] { flex: 1; min-width: 160px; accent-color: var(--green); }

.ranking-list { list-style: none; margin: 0; padding: 0; }
.ranking-row {
  display: grid;
  grid-template-columns: 2.5rem 48px 1fr auto auto auto;
  gap: 1rem;
  align-items: center;
  padding: 0.6rem 0.9rem;
  border-radius: 8px;
  transition: background 0.15s;
}
.ranking-row:hover { background: var(--bg-hover); }
.ranking-row.cut { opacity: 0.4; }
.ranking-row.cut .rank-num { color: var(--danger); }
.ranking-row .rank-num {
  font-weight: 800;
  color: var(--text-sub);
  text-align: right;
  font-variant-numeric: tabular-nums;
}
.ranking-row.top-3 .rank-num { color: var(--green-bright); }
.ranking-row .row-art {
  width: 48px;
  height: 48px;
  border-radius: 4px;
  background-size: cover;
  background-position: center;
  background-color: var(--bg-hover);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: rgba(255,255,255,0.8);
}
.ranking-row .row-meta { overflow: hidden; }
.ranking-row .row-title {
  display: block;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.ranking-row .row-artist {
  font-size: 0.8rem;
  color: var(--text-sub);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.ranking-row .row-trend { font-size: 0.85rem; width: 2rem; text-align: center; }
.trend-up { color: var(--green-bright); }
.trend-down { color: var(--danger); }
.trend-flat { color: var(--text-faint); }

.row-rating { text-align: right; }
.row-rating .rating-num {
  display: block;
  font-variant-numeric: tabular-nums;
  font-weight: 600;
  font-size: 0.9rem;
}
.row-rating .conf-bar {
  width: 64px;
  height: 4px;
  background: var(--bg-hover);
  border-radius: 999px;
  overflow: hidden;
  margin-top: 4px;
  margin-left: auto;
}
.row-rating .conf-fill { height: 100%; background: var(--green); border-radius: 999px; }

.prune-divider {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--danger);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin: 0.4rem 0;
}
.prune-divider::before, .prune-divider::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--danger);
  opacity: 0.4;
}

/* ============ Toast ============ */
.toast {
  position: fixed;
  bottom: 1.5rem;
  left: 50%;
  transform: translateX(-50%);
  background: var(--green);
  color: #000;
  font-weight: 700;
  padding: 0.7rem 1.4rem;
  border-radius: 999px;
  box-shadow: var(--shadow);
  z-index: 100;
  animation: toastIn 0.25s ease;
}
.toast.error { background: var(--danger); color: #fff; }
@keyframes toastIn {
  from { opacity: 0; transform: translate(-50%, 10px); }
  to { opacity: 1; transform: translate(-50%, 0); }
}