* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg: #0f172a;
  --card: #1e293b;
  --accent: #38bdf8;
  --accent-hover: #0ea5e9;
  --text: #e2e8f0;
  --muted: #94a3b8;
  --error: #f87171;
}

body {
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  padding: 2rem 1rem;
}

.container {
  width: 100%;
  max-width: 640px;
}

header {
  text-align: center;
  margin-bottom: 2rem;
}

h1 {
  font-size: 2rem;
  margin-bottom: 0.5rem;
}

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

#url-form {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

#url-input {
  flex: 1 1 320px;
  padding: 0.85rem 1rem;
  border-radius: 0.6rem;
  border: 1px solid #334155;
  background: var(--card);
  color: var(--text);
  font-size: 1rem;
}

#url-input:focus {
  outline: 2px solid var(--accent);
  border-color: transparent;
}

button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.85rem 1.4rem;
  border: none;
  border-radius: 0.6rem;
  background: var(--accent);
  color: #082f49;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s;
}

button:hover:not(:disabled) {
  background: var(--accent-hover);
}

button:disabled {
  opacity: 0.6;
  cursor: wait;
}

.spinner {
  width: 1rem;
  height: 1rem;
  border: 2px solid rgba(8, 47, 73, 0.3);
  border-top-color: #082f49;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.error {
  margin-top: 1.25rem;
  padding: 0.85rem 1rem;
  border-radius: 0.6rem;
  background: rgba(248, 113, 113, 0.12);
  border: 1px solid var(--error);
  color: var(--error);
}

.result {
  margin-top: 2rem;
  background: var(--card);
  border-radius: 0.8rem;
  padding: 1.25rem;
}

.preview {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  margin-bottom: 1.25rem;
}

#thumbnail {
  width: 160px;
  border-radius: 0.5rem;
  flex-shrink: 0;
}

.meta h2 {
  font-size: 1.1rem;
  margin-bottom: 0.4rem;
  word-break: break-word;
}

.meta p {
  color: var(--muted);
  font-size: 0.9rem;
}

.result h3 {
  font-size: 1rem;
  margin-bottom: 0.75rem;
}

.formats {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.formats button {
  width: 100%;
  justify-content: space-between;
  background: #0f172a;
  color: var(--text);
  border: 1px solid #334155;
}

.formats button:hover:not(:disabled) {
  background: #16213a;
  border-color: var(--accent);
}

.formats .dl-icon {
  color: var(--accent);
}

.note {
  margin-top: 0.75rem;
  color: var(--muted);
  font-size: 0.9rem;
}

footer {
  margin-top: 2.5rem;
  text-align: center;
  color: var(--muted);
  font-size: 0.8rem;
}

@media (max-width: 480px) {
  .preview {
    flex-direction: column;
  }

  #thumbnail {
    width: 100%;
  }
}