:root {
  --bg: #0b1020;
  --bg-card: #131a30;
  --bg-card-hover: #1a2240;
  --fg: #e6ecff;
  --fg-muted: #8a94b8;
  --accent: #7c5cff;
  --accent-2: #00d4ff;
  --border: #232c4f;
  --code-bg: #0a0f24;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
  --radius: 14px;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f7f8fc;
    --bg-card: #ffffff;
    --bg-card-hover: #f0f3ff;
    --fg: #0f1430;
    --fg-muted: #4a5470;
    --accent: #6446e6;
    --accent-2: #008fb0;
    --border: #e3e7f3;
    --code-bg: #eef1fa;
    --shadow: 0 8px 24px rgba(15, 20, 48, 0.08);
  }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Inter", "Roboto", "Helvetica Neue", Arial, "Noto Sans CJK SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.55;
}

.container { max-width: 1100px; margin: 0 auto; padding: 0 1.25rem; }

/* Header */
.hero {
  padding: 3rem 0 2.5rem;
  background: linear-gradient(135deg, rgba(124, 92, 255, 0.18), rgba(0, 212, 255, 0.10));
  border-bottom: 1px solid var(--border);
}
.hero .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  flex-wrap: wrap;
}
.hero-brand h1 {
  margin: 0;
  font-size: 3rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.tagline {
  margin: 0.25rem 0 0;
  font-size: 1.05rem;
  color: var(--fg-muted);
}

/* Lang switcher */
.lang-switch { display: flex; gap: 0.4rem; }
.lang-switch button {
  background: transparent;
  color: var(--fg-muted);
  border: 1px solid var(--border);
  padding: 0.4rem 0.75rem;
  border-radius: 8px;
  font-size: 0.9rem;
  cursor: pointer;
  transition: all 0.15s ease;
}
.lang-switch button:hover { color: var(--fg); border-color: var(--accent); }
.lang-switch button.active {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
}

/* Intro */
.intro { padding: 2.5rem 0 1.5rem; }
.intro h2 { font-size: 1.6rem; margin: 0 0 0.5rem; font-weight: 700; }
.intro p  { margin: 0; color: var(--fg-muted); max-width: 70ch; }

/* Grid */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1rem;
  padding: 1rem 0 3rem;
}

.card {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  padding: 1.25rem 1.25rem 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  text-decoration: none;
  color: inherit;
  transition: all 0.18s ease;
  position: relative;
  box-shadow: var(--shadow);
}
.card:hover:not(.disabled) {
  background: var(--bg-card-hover);
  border-color: var(--accent);
  transform: translateY(-2px);
}
.card h3 { margin: 0; font-size: 1.15rem; font-weight: 700; }
.card p  { margin: 0; color: var(--fg-muted); font-size: 0.95rem; }
.card.disabled { opacity: 0.55; cursor: not-allowed; }
.card.example { border-color: var(--accent-2); }

.badge {
  align-self: flex-start;
  margin-top: 0.5rem;
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  font-size: 0.72rem;
  font-weight: 600;
  background: rgba(124, 92, 255, 0.15);
  color: var(--accent);
  border: 1px solid var(--accent);
}
.badge.soon {
  background: rgba(138, 148, 184, 0.12);
  color: var(--fg-muted);
  border-color: var(--border);
}

/* Footer */
footer {
  padding: 1.5rem 0;
  border-top: 1px solid var(--border);
  color: var(--fg-muted);
  font-size: 0.9rem;
}
footer code {
  background: var(--code-bg);
  padding: 0.1rem 0.4rem;
  border-radius: 4px;
  font-size: 0.85rem;
}

/* "Work in progress" strip — Apogee is an exploratory project, say so up front */
.wip-banner {
  background: linear-gradient(135deg, rgba(124, 92, 255, 0.22), rgba(0, 212, 255, 0.14));
  border-bottom: 1px solid var(--border);
  color: var(--fg);
  font-size: 0.9rem;
  line-height: 1.5;
  padding: 0.65rem 1.25rem;
  text-align: center;
}

.wip-banner strong {
  color: var(--accent);
}