:root {
  --bg: #0d0d0f;
  --card: #18181b;
  --border: #27272a;
  --border-strong: #3f3f46;
  --text: #fafafa;
  --text-muted: #a1a1aa;
  --accent: #ef4444;
  --accent-hover: #dc2626;
  --accent-soft: rgba(239, 68, 68, 0.15);
  --link: #60a5fa;
  --link-soft: rgba(96, 165, 250, 0.15);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  font-size: 15px;
  line-height: 1.55;
  min-height: 100vh;
}

/* --- Header ----------------------------------------------------------- */

.app-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.85rem 1.5rem;
  border-bottom: 1px solid var(--border);
  background: var(--card);
}

.app-header h1 {
  margin: 0;
  font-size: 1.15rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.url-row {
  flex: 1;
  display: flex;
  gap: 0.5rem;
  margin: 0;
}
.url-row input { flex: 1; }

#status {
  margin: 0;
  padding: 0.5rem 1.5rem;
  color: var(--text-muted);
  font-size: 0.85rem;
  min-height: 1.4em;
}

/* --- Layout grid ------------------------------------------------------ */

.app-grid {
  display: grid;
  grid-template-columns: minmax(0, 480px) minmax(0, 1fr);
  gap: 1rem;
  padding: 0 1.5rem 1.5rem;
  max-width: 1280px;
  margin: 0 auto;
}

.left-col {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

@media (max-width: 900px) {
  .app-grid { grid-template-columns: 1fr; }
}

/* --- Cards ------------------------------------------------------------ */

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem;
}

.section-label {
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.7rem;
  color: var(--text-muted);
  font-weight: 600;
  margin-bottom: 0.6rem;
}

/* --- Player ----------------------------------------------------------- */

.player-card { padding: 0; overflow: hidden; }
.player-wrap { width: 100%; aspect-ratio: 16 / 9; }
.player-wrap iframe, #player { width: 100%; height: 100%; border: 0; display: block; }

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

input[type="text"] {
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 0.5rem 0.75rem;
  font: inherit;
  border-radius: 6px;
  outline: none;
  transition: border-color 0.1s;
}
input[type="text"]::placeholder { color: var(--text-muted); }
input[type="text"]:focus { border-color: var(--accent); }
input[type="text"]:disabled { opacity: 0.5; cursor: not-allowed; }

button {
  background: var(--accent);
  color: var(--text);
  border: none;
  padding: 0.5rem 1rem;
  border-radius: 6px;
  font: inherit;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.1s, transform 0.05s;
}
button:hover:not(:disabled) { background: var(--accent-hover); }
button:active:not(:disabled) { transform: translateY(1px); }
button:disabled {
  background: var(--border-strong);
  color: var(--text-muted);
  cursor: not-allowed;
}

/* --- Summary ---------------------------------------------------------- */

#summary-out {
  white-space: pre-wrap;
  margin-top: 0.75rem;
  font-size: 0.95rem;
}
#summary-out:empty { display: none; }

/* --- Chat ------------------------------------------------------------- */

.chat-card {
  display: flex;
  flex-direction: column;
  min-height: 520px;
  height: calc(100vh - 180px);
}

#messages {
  flex: 1;
  overflow-y: auto;
  margin: 0 -0.25rem 0.75rem;
  padding: 0 0.25rem;
}

.msg {
  padding: 0.6rem 0;
  border-bottom: 1px solid var(--border);
  white-space: pre-wrap;
  font-size: 0.95rem;
}
.msg:last-child { border-bottom: none; }

.msg .role {
  display: inline-block;
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 700;
  padding: 0.1rem 0.45rem;
  border-radius: 999px;
  margin-right: 0.5rem;
  vertical-align: 2px;
}
.msg-user .role { background: var(--link-soft); color: var(--link); }
.msg-assistant .role { background: var(--accent-soft); color: var(--accent); }

#chat-form {
  display: flex;
  gap: 0.5rem;
  margin-top: auto;
}
#chat-form input { flex: 1; }

/* --- Timestamp citations --------------------------------------------- */

a.ts {
  display: inline-block;
  background: var(--accent-soft);
  color: var(--accent);
  padding: 0 0.35rem;
  border-radius: 4px;
  text-decoration: none;
  font-family: ui-monospace, "SF Mono", SFMono-Regular, Menlo, monospace;
  font-size: 0.88em;
  cursor: pointer;
  transition: background 0.1s;
}
a.ts:hover { background: rgba(239, 68, 68, 0.28); }

/* --- Scrollbar (subtle, dark) ---------------------------------------- */

#messages::-webkit-scrollbar { width: 8px; }
#messages::-webkit-scrollbar-track { background: transparent; }
#messages::-webkit-scrollbar-thumb { background: var(--border-strong); border-radius: 4px; }
#messages::-webkit-scrollbar-thumb:hover { background: #52525b; }