* {
  box-sizing: border-box;
}

:root {
  color-scheme: dark;
  --background: #0f172a;
  --panel: #111827;
  --panel-light: #1f2937;
  --text: #f9fafb;
  --muted: #9ca3af;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --danger: #f87171;
  --border: rgba(255, 255, 255, 0.09);
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: Arial, Helvetica, sans-serif;
  background: radial-gradient(circle at top, #1e293b, var(--background));
  color: var(--text);
}

.auth-layout,
.app-layout {
  width: min(100%, 980px);
  margin: 0 auto;
  padding: 32px;
}

.auth-layout {
  min-height: 100vh;
  display: grid;
  place-items: center;
}

.card,
.topbar {
  background: rgba(17, 24, 39, 0.92);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 24px;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.28);
}

.auth-card {
  width: min(100%, 420px);
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 24px;
}

.card + .card {
  margin-top: 24px;
}

h1,
h2,
p {
  margin-top: 0;
}

h1 {
  font-size: 2rem;
  margin-bottom: 8px;
}

h2 {
  font-size: 1.2rem;
  margin-bottom: 16px;
}

.eyebrow {
  color: var(--accent);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.11em;
  font-weight: 700;
  margin-bottom: 8px;
}

.muted {
  color: var(--muted);
}

.form {
  margin-top: 24px;
}

label {
  display: block;
  color: var(--muted);
  margin-bottom: 16px;
}

input {
  display: block;
  width: 100%;
  margin-top: 8px;
  padding: 12px 14px;
  color: var(--text);
  background: var(--panel-light);
  border: 1px solid var(--border);
  border-radius: 10px;
  outline: none;
}

input:focus {
  border-color: var(--accent);
}

button {
  border: 0;
  border-radius: 10px;
  padding: 11px 16px;
  color: white;
  background: var(--accent);
  font-weight: 700;
  cursor: pointer;
}

button:hover {
  background: var(--accent-hover);
}

button.secondary {
  background: var(--panel-light);
}

button.secondary:hover {
  background: #374151;
}

.error {
  min-height: 1.2em;
  color: var(--danger);
  margin-top: 16px;
}

video {
  width: 100%;
  max-height: 64vh;
  display: block;
  background: black;
  border-radius: 14px;
  border: 1px solid var(--border);
}

.video-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 12px;
}

.video-button {
  width: 100%;
  text-align: left;
  background: var(--panel-light);
}

.video-button:hover {
  background: #374151;
}

@media (max-width: 640px) {
  .auth-layout,
  .app-layout {
    padding: 18px;
  }

  .topbar {
    align-items: flex-start;
    flex-direction: column;
  }
}