/* Suwenbencao Sleep Course — shared styles */

:root {
  --color-bg: #f4f7fb;
  --color-surface: #ffffff;
  --color-text: #1a2332;
  --color-muted: #5c6b7f;
  --color-accent: #3d6b8e;
  --color-accent-hover: #2d5470;
  --color-border: #dde4ed;
  --color-highlight: #e8f0f6;
  --font-sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --max-width: 960px;
  --radius: 8px;
  --shadow: 0 2px 12px rgba(26, 35, 50, 0.08);
}

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

html {
  font-size: 100%;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  display: flex;
  flex-direction: column;
}

a {
  color: var(--color-accent);
  text-decoration: none;
}

a:hover {
  color: var(--color-accent-hover);
  text-decoration: underline;
}

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

.site-header__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.site-brand {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--color-text);
  text-decoration: none;
}

.site-brand:hover {
  color: var(--color-accent);
  text-decoration: none;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.25rem;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 0.95rem;
}

.site-nav a {
  white-space: nowrap;
}

main {
  flex: 1;
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2rem 1.25rem 3rem;
}

.page-title {
  margin: 0 0 0.5rem;
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  line-height: 1.25;
}

.page-lead {
  margin: 0 0 2rem;
  color: var(--color-muted);
  font-size: 1.05rem;
  max-width: 42rem;
}

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow);
  margin-bottom: 1.5rem;
}

.card h2 {
  margin: 0 0 0.75rem;
  font-size: 1.25rem;
}

.card p:last-child {
  margin-bottom: 0;
}

.btn {
  display: inline-block;
  padding: 0.65rem 1.25rem;
  font-size: 1rem;
  font-weight: 600;
  color: #fff;
  background: var(--color-accent);
  border: none;
  border-radius: var(--radius);
  text-decoration: none;
  cursor: pointer;
  transition: background 0.15s ease;
}

.btn:hover {
  background: var(--color-accent-hover);
  color: #fff;
  text-decoration: none;
}

.btn-secondary {
  background: transparent;
  color: var(--color-accent);
  border: 2px solid var(--color-accent);
}

.btn-secondary:hover {
  background: var(--color-highlight);
  color: var(--color-accent-hover);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.25rem;
}

.price-tag {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--color-accent);
  margin: 0.5rem 0 0;
}

.feature-list {
  margin: 0;
  padding-left: 1.25rem;
}

.feature-list li {
  margin-bottom: 0.5rem;
}

.form-placeholder label {
  display: block;
  margin-bottom: 0.35rem;
  font-weight: 600;
  font-size: 0.9rem;
}

.form-placeholder input,
.form-placeholder select,
.form-placeholder textarea {
  width: 100%;
  max-width: 24rem;
  padding: 0.6rem 0.75rem;
  margin-bottom: 1rem;
  font: inherit;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-surface);
}

.form-note {
  font-size: 0.875rem;
  color: var(--color-muted);
  margin-top: 0.5rem;
}

.lesson-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.lesson-list li {
  padding: 0.85rem 0;
  border-bottom: 1px solid var(--color-border);
}

.lesson-list li:last-child {
  border-bottom: none;
}

.video-placeholder {
  aspect-ratio: 16 / 9;
  background: var(--color-highlight);
  border: 2px dashed var(--color-border);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-muted);
  font-size: 0.95rem;
  margin-bottom: 1.5rem;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.stat-box {
  background: var(--color-highlight);
  border-radius: var(--radius);
  padding: 1rem;
  text-align: center;
}

.stat-box strong {
  display: block;
  font-size: 1.5rem;
  color: var(--color-accent);
}

.stat-box span {
  font-size: 0.85rem;
  color: var(--color-muted);
}

.site-footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: 1.25rem;
  text-align: center;
  font-size: 0.875rem;
  color: var(--color-muted);
}

.site-footer a {
  font-weight: 600;
}

@media (max-width: 480px) {
  main {
    padding-top: 1.5rem;
  }

  .site-nav {
    width: 100%;
    flex-direction: column;
    gap: 0.5rem;
  }
}