:root {
  --bg: #0d0f17;
  --bg-2: #161a26;
  --text: #e8eaf2;
  --muted: #9aa0b4;
  --accent: #7c5cff;
  --accent-2: #00d4ff;
  --border: #262b3d;
  --radius: 16px;
}

[data-theme="light"] {
  --bg: #f7f8fc;
  --bg-2: #ffffff;
  --text: #171a26;
  --muted: #5d6378;
  --border: #e3e6ef;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: "Inter", "IBM Plex Sans Thai", system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  transition: background 0.3s, color 0.3s;
}

a { color: inherit; text-decoration: none; }

/* ---------- Nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 10;
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
  padding: 1rem 5vw;
  background: color-mix(in srgb, var(--bg) 80%, transparent);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.logo { font-weight: 800; font-size: 1.1rem; }
.nav nav { display: flex; gap: 1.5rem; }
.nav nav a { color: var(--muted); font-weight: 600; transition: color 0.2s; }
.nav nav a:hover { color: var(--text); }
.controls { display: flex; gap: 0.5rem; }

.pill {
  display: inline-flex; align-items: center; gap: 0.4rem;
  padding: 0.45rem 0.9rem;
  border: 1px solid var(--border); border-radius: 999px;
  background: var(--bg-2); color: var(--text);
  font: inherit; font-weight: 600; font-size: 0.9rem;
  cursor: pointer; transition: border-color 0.2s, transform 0.2s;
}
.pill:hover { border-color: var(--accent); transform: translateY(-1px); }

/* ---------- Hero ---------- */
.hero {
  min-height: 80vh;
  display: flex; flex-direction: column; justify-content: center;
  padding: 4rem 5vw;
  background:
    radial-gradient(circle at 80% 20%, color-mix(in srgb, var(--accent) 25%, transparent), transparent 40%),
    radial-gradient(circle at 10% 80%, color-mix(in srgb, var(--accent-2) 18%, transparent), transparent 40%);
}
.eyebrow { color: var(--muted); font-weight: 600; margin-bottom: 0.5rem; }
.hero h1 { font-size: clamp(2.5rem, 7vw, 5rem); line-height: 1.15; font-weight: 800; }
.gradient {
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.lead { max-width: 560px; margin: 1.5rem 0 2rem; color: var(--muted); font-size: 1.15rem; }
.btn {
  align-self: flex-start;
  padding: 0.85rem 1.6rem; border-radius: 999px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  color: #fff; font-weight: 700;
  transition: transform 0.2s, box-shadow 0.2s;
}
.btn:hover { transform: translateY(-2px); box-shadow: 0 10px 30px -10px var(--accent); }

/* ---------- Sections ---------- */
.section { padding: 5rem 5vw; max-width: 1100px; margin: 0 auto; }
.section h2 { font-size: 2rem; margin-bottom: 1rem; }
.muted { color: var(--muted); margin-bottom: 2rem; }

.grid {
  display: grid; gap: 1.25rem;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
}
.card {
  display: block; padding: 1.5rem;
  background: var(--bg-2); border: 1px solid var(--border); border-radius: var(--radius);
  transition: transform 0.25s, border-color 0.25s;
}
.card:hover { transform: translateY(-4px); border-color: var(--accent); }
.card .emoji { font-size: 2rem; }
.card h3 { margin: 0.5rem 0 0.25rem; }
.card p { color: var(--muted); font-size: 0.95rem; }
.tag {
  display: inline-block; margin-top: 0.75rem;
  font-size: 0.75rem; padding: 0.15rem 0.6rem; border-radius: 999px;
  background: color-mix(in srgb, var(--accent) 20%, transparent); color: var(--accent);
}

.links { display: flex; flex-wrap: wrap; gap: 0.75rem; margin-top: 1rem; }

.footer { text-align: center; padding: 2rem; color: var(--muted); border-top: 1px solid var(--border); font-size: 0.9rem; }

@media (max-width: 640px) {
  .nav nav { display: none; }
}