/* ===== Design tokens ===== */
:root {
  --bg: #ffffff;
  --bg-alt: #f5f7fa;
  --surface: #ffffff;
  --text: #131720;
  --muted: #5b6573;
  --border: #e6e9ef;

  --accent: #2563eb;
  --accent-2: #06b6d4;
  --accent-ink: #ffffff;

  --maxw: 1080px;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(16, 24, 40, 0.04),
    0 12px 28px rgba(16, 24, 40, 0.06);

  --font: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial,
    sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1117;
    --bg-alt: #11161f;
    --surface: #161b24;
    --text: #e8ecf3;
    --muted: #9aa6b8;
    --border: #232a36;
    --accent: #4f86ff;
    --accent-2: #22d3ee;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 12px 28px rgba(0, 0, 0, 0.45);
  }
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3 {
  line-height: 1.15;
  margin: 0 0 0.5em;
  letter-spacing: -0.02em;
}

p {
  margin: 0 0 1rem;
}

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

.container {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: 24px;
}

.container.narrow {
  max-width: 720px;
}

.center {
  text-align: center;
}

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

/* ===== Header ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.brand {
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
}

.brand-mark {
  color: var(--accent);
}

.brand-accent {
  color: var(--accent);
}

.nav {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  font-size: 0.95rem;
}

.nav a {
  color: var(--muted);
  transition: color 0.15s ease;
}

.nav a:hover {
  color: var(--text);
}

.nav-cta {
  color: var(--accent) !important;
  font-weight: 600;
}

/* ===== Hero ===== */
.hero {
  position: relative;
  overflow: hidden;
  padding: clamp(72px, 12vw, 140px) 0 clamp(64px, 10vw, 120px);
}

.hero::before {
  content: "";
  position: absolute;
  inset: -40% -10% auto;
  height: 520px;
  background: radial-gradient(
      60% 60% at 20% 20%,
      color-mix(in srgb, var(--accent) 22%, transparent),
      transparent 70%
    ),
    radial-gradient(
      50% 50% at 90% 10%,
      color-mix(in srgb, var(--accent-2) 20%, transparent),
      transparent 70%
    );
  filter: blur(8px);
  pointer-events: none;
  z-index: -1;
}

.hero-inner {
  max-width: 760px;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 1rem;
}

.hero-title {
  font-size: clamp(2.4rem, 6vw, 4rem);
  font-weight: 800;
}

.grad {
  background: linear-gradient(100deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-lede {
  font-size: clamp(1.05rem, 2.2vw, 1.3rem);
  color: var(--muted);
  max-width: 56ch;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 2rem;
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.8rem 1.4rem;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.98rem;
  border: 1px solid transparent;
  transition: transform 0.12s ease, box-shadow 0.15s ease,
    background 0.15s ease, border-color 0.15s ease;
}

.btn:active {
  transform: translateY(1px);
}

.btn-primary {
  background: var(--accent);
  color: var(--accent-ink);
  box-shadow: var(--shadow);
}

.btn-primary:hover {
  background: color-mix(in srgb, var(--accent) 88%, #000);
}

.btn-ghost {
  border-color: var(--border);
  color: var(--text);
  background: var(--surface);
}

.btn-ghost:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* ===== Sections ===== */
.section {
  padding: clamp(56px, 9vw, 100px) 0;
}

.section-alt {
  background: var(--bg-alt);
  border-block: 1px solid var(--border);
}

.section-title {
  font-size: clamp(1.6rem, 4vw, 2.2rem);
  font-weight: 700;
}

.section-sub {
  color: var(--muted);
  margin-top: -0.25rem;
  margin-bottom: 2rem;
}

/* ===== Cards ===== */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.25rem;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow);
  transition: transform 0.15s ease, border-color 0.15s ease;
}

.card:hover {
  transform: translateY(-3px);
  border-color: color-mix(in srgb, var(--accent) 40%, var(--border));
}

.card h3 {
  font-size: 1.15rem;
}

.card p {
  color: var(--muted);
  margin: 0;
}

/* ===== Footer ===== */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 2rem 0;
  font-size: 0.9rem;
  color: var(--muted);
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.5rem;
  align-items: center;
  justify-content: space-between;
}

/* ===== Motion preferences ===== */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  * {
    transition: none !important;
  }
}