*,
*::before,
*::after {
  box-sizing: border-box;
}

:root {
  color-scheme: dark;
  --bg: #0f1115;
  --card: #1a1f28;
  --border: #2a3140;
  --text: #e8ecf3;
  --muted: #9aa3b5;
  --accent: #3d8bfd;
  --accent-hover: #5c9dff;
  --active: #1e3a5f;
}

html {
  font-size: 15px;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans TC", sans-serif;
  background: var(--bg);
  color: var(--text);
}

.site-header {
  padding: 1rem 1.25rem 0.5rem;
  border-bottom: 1px solid var(--border);
}

.site-header h1 {
  margin: 0;
  font-size: 1.35rem;
  font-weight: 600;
}

.subtitle {
  margin: 0.35rem 0 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 1rem;
  padding: 1rem;
  max-width: 1400px;
  margin: 0 auto;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
}

.player-panel {
  position: sticky;
  top: 0.75rem;
  align-self: start;
}

#video {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  background: #000;
}

.status-line {
  padding: 0.65rem 0.9rem;
  font-size: 0.85rem;
  color: var(--muted);
  border-top: 1px solid var(--border);
  min-height: 2.5rem;
}

.channel-panel {
  display: flex;
  flex-direction: column;
  max-height: calc(100vh - 6rem);
}

.panel-title {
  margin: 0;
  padding: 0.75rem 1rem;
  font-size: 1rem;
  border-bottom: 1px solid var(--border);
}

.channel-list {
  list-style: none;
  margin: 0;
  padding: 0.5rem;
  overflow-y: auto;
  flex: 1;
}

.channel-list li {
  margin: 0;
}

.channel-btn {
  width: 100%;
  text-align: left;
  padding: 0.65rem 0.75rem;
  margin-bottom: 0.35rem;
  border: 1px solid transparent;
  border-radius: 8px;
  background: transparent;
  color: var(--text);
  font-size: 0.95rem;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
}

.channel-btn:hover {
  background: rgba(61, 139, 253, 0.12);
  border-color: rgba(61, 139, 253, 0.35);
}

.channel-btn.active {
  background: var(--active);
  border-color: var(--accent);
  color: #fff;
}

@media (max-width: 900px) {
  html {
    font-size: 14px;
  }

  .layout {
    grid-template-columns: 1fr;
    padding: 0.75rem;
  }

  .player-panel {
    position: sticky;
    top: 0;
    z-index: 2;
    border-radius: 0;
    margin: -0.75rem -0.75rem 0;
  }

  .channel-panel {
    max-height: none;
  }

  .channel-list {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.35rem;
    padding: 0.75rem;
  }

  .channel-btn {
    margin-bottom: 0;
    font-size: 0.9rem;
    padding: 0.75rem 0.5rem;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .channel-list {
    grid-template-columns: 1fr;
  }
}

/* Standalone auth pages (must not reuse play.php two-column .layout). */
.login-layout {
  display: block;
  width: 100%;
  max-width: 420px;
  margin: 2rem auto;
  padding: 1rem;
  box-sizing: border-box;
}

.login-card {
  display: block;
  width: 100%;
  padding: 1.5rem;
  box-sizing: border-box;
}

.login-card label {
  display: block;
  width: 100%;
  color: var(--text);
  font-size: 0.95rem;
}

.login-card label + label {
  margin-top: 1rem;
}

.login-card input[type="text"],
.login-card input[type="password"],
.login-card input:not([type]) {
  display: block;
  width: 100%;
  min-width: 0;
  margin-top: 0.35rem;
  padding: 0.65rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #12161e;
  color: var(--text);
  font-size: 1rem;
  line-height: 1.4;
}

.login-card input:focus {
  outline: 2px solid rgba(61, 139, 253, 0.55);
  outline-offset: 1px;
  border-color: var(--accent);
}

.login-card .login-submit {
  display: block;
  width: 100%;
  margin-top: 1.25rem;
  text-align: center;
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  font-weight: 600;
}

.login-card .login-submit:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
}