:root {
  --bg: #0b0d12;
  --panel: #12151c;
  --panel-border: #232838;
  --text: #e6e9f0;
  --text-dim: #9aa3b5;
  --accent: #5b8cff;
  --accent-text: #0b0d12;
  --ok: #3ecf8e;
  --err: #ff6b6b;
  --mono: "SF Mono", "JetBrains Mono", Consolas, Menlo, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  line-height: 1.5;
}

.topbar {
  border-bottom: 1px solid var(--panel-border);
  background: var(--panel);
}
.topbar-inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: 14px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.brand-mark { font-weight: 700; }
.brand-sub { color: var(--text-dim); margin-left: 6px; }
.ghlink { color: var(--text-dim); text-decoration: none; font-size: 0.9em; }
.ghlink:hover { color: var(--accent); }

.layout {
  max-width: 1080px;
  margin: 0 auto;
  padding: 28px 20px 60px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}
@media (max-width: 820px) {
  .layout { grid-template-columns: 1fr; }
}
@media (max-width: 480px) {
  .layout { padding: 20px 14px 40px; gap: 14px; }
  .panel { padding: 16px; }
  .topbar-inner { padding: 12px 14px; }
  h1 { font-size: 1.15rem; }
  /* "Upload your own" doesn't fit three-across on a phone without
     wrapping mid-word — stacking keeps every label on one line and
     keeps the active tab obviously tappable at touch size. */
  .mode-switch { flex-direction: column; }
  .field-row { flex-direction: column; gap: 0; }
}

.panel {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 12px;
  padding: 22px;
}
.manifest-panel { grid-column: 1 / -1; }

h1 { font-size: 1.3rem; margin: 0 0 8px; }
h2 { font-size: 1.05rem; margin: 0 0 8px; }
.lede { color: var(--text-dim); font-size: 0.92rem; margin: 0 0 18px; }

.mode-switch { display: flex; gap: 6px; margin-bottom: 16px; }
.mode-btn {
  flex: 1;
  padding: 9px 12px;
  border-radius: 8px;
  border: 1px solid var(--panel-border);
  background: transparent;
  color: var(--text-dim);
  cursor: pointer;
  font-size: 0.88rem;
}
.mode-btn.is-active {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-text);
  font-weight: 600;
}

.mode-panel.is-hidden { display: none; }

.field { display: block; margin-bottom: 12px; font-size: 0.88rem; }
.field span { display: block; color: var(--text-dim); margin-bottom: 6px; }
.field input {
  width: 100%;
  padding: 8px 10px;
  border-radius: 7px;
  border: 1px solid var(--panel-border);
  background: #0e1119;
  color: var(--text);
  font: inherit;
}
.field input[type="file"] { cursor: pointer; }
.field input[type="file"]::file-selector-button { cursor: pointer; }
.field-row { display: flex; gap: 12px; }
.field-row .field { flex: 1; }

.hint { color: var(--text-dim); font-size: 0.8rem; margin: 0 0 14px; }

.link-btn {
  display: inline-block;
  background: none;
  border: none;
  padding: 0;
  margin: -6px 0 12px;
  color: var(--accent);
  font-size: 0.82rem;
  cursor: pointer;
  text-decoration: underline;
}
.link-btn:hover { color: var(--text); }

.run-btn {
  width: 100%;
  padding: 11px 14px;
  border-radius: 8px;
  border: none;
  background: var(--accent);
  color: var(--accent-text);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
}
.run-btn:disabled { opacity: 0.5; cursor: default; }
.stop-btn { background: transparent; border: 1px solid var(--err); color: var(--err); margin-top: 10px; }
.stop-btn:hover:not(:disabled) { background: rgba(255, 107, 107, 0.1); }
.run-btn:hover:not(:disabled) { filter: brightness(1.08); }

.status {
  margin-top: 16px;
  font-size: 0.86rem;
  color: var(--text-dim);
  min-height: 1.2em;
}
.status.is-ok { color: var(--ok); }
.status.is-error { color: var(--err); }

.player-panel { display: flex; flex-direction: column; align-items: center; justify-content: center; }
#player {
  width: 100%;
  border-radius: 8px;
  background: #000;
  display: none;
}
#player.is-visible { display: block; }
.player-empty {
  color: var(--text-dim);
  font-size: 0.9rem;
  text-align: center;
  padding: 40px 10px;
}
.player-empty.is-hidden { display: none; }

.manifest-text {
  font-family: var(--mono);
  font-size: 0.82rem;
  background: #0e1119;
  border: 1px solid var(--panel-border);
  border-radius: 8px;
  padding: 14px;
  overflow-x: auto;
  white-space: pre;
}
.manifest-text mark {
  background: rgba(91, 140, 255, 0.25);
  color: #cddcff;
  border-radius: 3px;
}

.footer {
  text-align: center;
  color: var(--text-dim);
  font-size: 0.82rem;
  padding: 20px;
}
.footer a { color: var(--accent); }

.is-hidden { display: none; }