:root {
  --bg: #0a0a0b;
  --bg-2: #111114;
  --panel: #17171c;
  --panel-2: #20202a;
  --text: #f2f2f5;
  --muted: #8c8c99;
  --accent: #e8212a;
  --accent-hover: #ff3b45;
  --accent-soft: rgba(232, 33, 42, 0.15);
  --danger: #ff5a63;
  --warn: #f5a623;
  --ok: #4ecb71;
  --border: #26262f;
  --border-strong: #35353f;
}
* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background:
    radial-gradient(1200px 600px at 80% -10%, rgba(232, 33, 42, 0.12), transparent 60%),
    radial-gradient(900px 500px at -10% 10%, rgba(232, 33, 42, 0.06), transparent 55%),
    var(--bg);
  color: var(--text);
  line-height: 1.5;
  min-height: 100%;
}
header {
  padding: 28px 32px 20px;
  border-bottom: 1px solid var(--border);
  background: linear-gradient(180deg, rgba(255,255,255,0.02), transparent);
}
.brand {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 16px;
}
.brand-logo {
  height: 38px;
  width: auto;
  display: block;
}
.brand-tag {
  margin-left: auto;
  font-size: 11px;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  border: 1px solid var(--border);
  padding: 5px 10px;
  border-radius: 999px;
}
h1 {
  margin: 0 0 6px;
  font-size: 24px;
  font-weight: 700;
  letter-spacing: -0.2px;
}
.subtitle { color: var(--muted); margin: 0; max-width: 680px; }
main {
  padding: 28px 32px 80px;
  max-width: 960px;
  margin: 0 auto;
}
.step {
  position: relative;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 22px 24px;
  margin-bottom: 18px;
  transition: opacity 0.2s, border-color 0.2s, transform 0.2s;
}
.step:not(.disabled):hover { border-color: var(--border-strong); }
.step.disabled { opacity: 0.4; pointer-events: none; }
.step h2 {
  margin: 0 0 16px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--muted);
  text-transform: uppercase;
  display: flex;
  align-items: center;
}
.step h2 .n {
  display: inline-grid;
  place-items: center;
  width: 24px; height: 24px;
  background: var(--accent);
  color: #fff;
  border-radius: 50%;
  margin-right: 12px;
  font-size: 12px;
  font-weight: 700;
  box-shadow: 0 4px 12px -2px rgba(232, 33, 42, 0.45);
}
.step.disabled h2 .n { background: var(--panel-2); color: var(--muted); box-shadow: none; }

.drop {
  display: block;
  padding: 36px 20px;
  border: 2px dashed var(--border-strong);
  border-radius: 12px;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
  background: var(--bg-2);
}
.drop:hover, .drop.drag {
  border-color: var(--accent);
  background: var(--accent-soft);
}
.drop input { display: none; }
.drop span {
  display: block;
  font-weight: 600;
  font-size: 15px;
}
.drop small {
  display: block;
  margin-top: 8px;
  color: var(--muted);
  font-size: 12px;
}

.row {
  display: flex;
  gap: 14px;
  align-items: flex-end;
  flex-wrap: wrap;
}
.row label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  flex: 1 1 260px;
  color: var(--muted);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 600;
}
select, button, input[type="text"] {
  font: inherit;
  font-size: 14px;
  padding: 10px 14px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--panel-2);
  color: var(--text);
  transition: border-color 0.15s, background 0.15s;
}
select { min-width: 0; }
select:hover, select:focus { border-color: var(--border-strong); outline: none; }
button {
  background: var(--accent);
  color: #fff;
  font-weight: 600;
  border: 0;
  cursor: pointer;
  padding: 10px 18px;
  text-transform: none;
  letter-spacing: 0;
  box-shadow: 0 6px 20px -6px rgba(232, 33, 42, 0.6);
}
button:hover:not(:disabled) { background: var(--accent-hover); }
button:disabled {
  background: var(--panel-2);
  color: var(--muted);
  cursor: not-allowed;
  box-shadow: none;
}

.tree-wrap {
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
}
.tree-meta {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  font-size: 13px;
  color: var(--muted);
}
.tree-meta strong { color: var(--text); font-weight: 600; }
.tree {
  margin: 0;
  padding: 14px 16px;
  max-height: 360px;
  overflow: auto;
  font-family: 'SF Mono', 'JetBrains Mono', Menlo, Consolas, monospace;
  font-size: 12px;
  white-space: pre;
  color: #c4c4cc;
}

.warnings { margin-bottom: 16px; }
.warnings .warn,
.warnings .err {
  display: block;
  padding: 10px 14px;
  margin-bottom: 6px;
  border-radius: 0 6px 6px 0;
  font-size: 13px;
  border-left: 3px solid;
}
.warnings .warn {
  background: rgba(245, 166, 35, 0.08);
  border-left-color: var(--warn);
  color: #ffd89a;
}
.warnings .err {
  background: rgba(255, 90, 99, 0.10);
  border-left-color: var(--danger);
  color: #ffb8bd;
}
.warnings .err::before { content: 'Error — '; font-weight: 700; }
.warnings .warn::before { content: 'Warning — '; font-weight: 600; opacity: 0.9; }

button.secondary {
  background: var(--panel-2);
  color: var(--text);
  box-shadow: none;
  border: 1px solid var(--border-strong);
}
button.secondary:hover:not(:disabled) {
  background: var(--panel);
  border-color: var(--accent);
}
.hint {
  margin: 12px 2px 0;
  font-size: 12px;
  color: var(--muted);
}

.season-picker { margin-top: 14px; }
.season-picker-toolbar {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  padding: 10px 12px;
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: 10px 10px 0 0;
  border-bottom: 0;
}
.season-picker-toolbar .check-inline {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 600;
  color: var(--text);
  cursor: pointer;
  text-transform: none;
  letter-spacing: 0;
}
.season-picker-toolbar input[type="search"] {
  flex: 1 1 220px;
  min-width: 160px;
  font: inherit;
  font-size: 13px;
  padding: 7px 10px;
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 7px;
}
.season-picker-toolbar input[type="search"]:focus {
  outline: none;
  border-color: var(--accent);
}
.muted { color: var(--muted); font-size: 12px; }

.season-list {
  border: 1px solid var(--border);
  border-radius: 0 0 10px 10px;
  background: var(--bg-2);
  max-height: 420px;
  overflow-y: auto;
  padding: 4px 0;
}
.season-list:empty::before {
  content: 'Upload a file to see the list of seasons.';
  display: block;
  padding: 24px;
  color: var(--muted);
  text-align: center;
  font-size: 13px;
}

.season-group { border-bottom: 1px solid var(--border); }
.season-group:last-child { border-bottom: 0; }
.season-group-header {
  padding: 8px 14px;
  background: rgba(255, 255, 255, 0.02);
  position: sticky;
  top: 0;
  z-index: 1;
  backdrop-filter: blur(6px);
}
.season-group-header label {
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  font-size: 13px;
  font-weight: 600;
  color: var(--text);
}
.season-group-header .group-count {
  margin-left: auto;
  color: var(--muted);
  font-size: 11px;
  font-weight: 500;
  background: var(--panel);
  border-radius: 999px;
  padding: 2px 8px;
}
.season-group-items {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 2px;
  padding: 4px 8px 8px 28px;
}
.season-row {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 8px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 13px;
  color: var(--text);
  transition: background 0.12s;
}
.season-row:hover { background: var(--panel-2); }
.season-row input { accent-color: var(--accent); }
.season-row .season-ep-count {
  margin-left: auto;
  color: var(--muted);
  font-size: 11px;
}
.season-group.hidden { display: none; }

.actions {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-top: 16px;
}
.status { color: var(--muted); font-size: 13px; }
.status.ok { color: var(--ok); }
.status.err { color: var(--danger); }

footer {
  text-align: center;
  color: var(--muted);
  font-size: 12px;
  padding: 16px 20px 32px;
  border-top: 1px solid var(--border);
  margin-top: 20px;
}
code {
  background: var(--panel-2);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 12px;
  color: #ffb0b5;
}

@media (max-width: 640px) {
  header, main { padding-left: 20px; padding-right: 20px; }
  .brand-tag { display: none; }
  h1 { font-size: 20px; }
}