:root {
  --bg: #ffffff;
  --fg: #111111;
  --muted: #6b6b6b;
  --border: #e2e2e2;
  --border-strong: #111111;
  --error: #b00020;
  --radius: 6px;
  color-scheme: light;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.5;
  min-height: 100vh;
  display: flex;
  justify-content: center;
}

.container {
  width: 100%;
  max-width: 640px;
  padding: 64px 20px 40px;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.header {
  text-align: center;
  margin-bottom: 32px;
}

.logo {
  font-size: 28px;
  font-weight: 700;
  letter-spacing: 0.08em;
  margin: 0 0 12px;
}

.tagline {
  color: var(--muted);
  margin: 0;
  font-size: 15px;
}

.fetch-form {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

#url-input {
  width: 100%;
  padding: 14px 16px;
  font-size: 16px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  background: var(--bg);
  color: var(--fg);
}

#url-input:focus {
  outline: 2px solid var(--fg);
  outline-offset: 1px;
}

#fetch-button {
  padding: 14px 16px;
  font-size: 15px;
  font-weight: 600;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  background: var(--fg);
  color: var(--bg);
  cursor: pointer;
}

#fetch-button:hover:not(:disabled) {
  opacity: 0.85;
}

#fetch-button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.message {
  min-height: 20px;
  margin: 16px 0 0;
  font-size: 14px;
  color: var(--muted);
  text-align: center;
}

.message.error {
  color: var(--error);
}

.result {
  width: 100%;
  margin-top: 32px;
}

.video-card {
  display: flex;
  gap: 16px;
  margin-bottom: 24px;
}

.thumbnail {
  width: 160px;
  height: 90px;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: #f2f2f2;
  flex-shrink: 0;
}

.video-meta {
  min-width: 0;
}

.video-title {
  font-size: 17px;
  font-weight: 600;
  margin: 0 0 4px;
  overflow-wrap: break-word;
}

.video-channel,
.video-duration {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.formats-table {
  width: 100%;
  border-collapse: collapse;
}

.formats-table th,
.formats-table td {
  text-align: left;
  padding: 12px 8px;
  border-bottom: 1px solid var(--border);
  font-size: 15px;
}

.formats-table th {
  color: var(--muted);
  font-weight: 500;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.download-btn {
  padding: 8px 14px;
  font-size: 14px;
  font-weight: 600;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  background: var(--bg);
  color: var(--fg);
  cursor: pointer;
}

.download-btn:hover:not(:disabled) {
  background: var(--fg);
  color: var(--bg);
}

.download-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.formats-cards {
  display: none;
  flex-direction: column;
  gap: 12px;
}

.format-card {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.format-card .format-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.format-card .format-quality {
  font-weight: 600;
}

.format-card .format-detail {
  color: var(--muted);
  font-size: 13px;
}

.footer {
  margin-top: 48px;
  color: var(--muted);
  font-size: 13px;
  text-align: center;
}

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

@media (max-width: 560px) {
  .container {
    padding: 40px 16px 32px;
  }

  .video-card {
    flex-direction: column;
  }

  .thumbnail {
    width: 100%;
    height: auto;
    aspect-ratio: 16 / 9;
  }

  .formats-table {
    display: none;
  }

  .formats-cards {
    display: flex;
  }
}