/* ---------- Design-Tokens ---------- */
:root {
  --bg: #ffffff;
  --bg-soft: #f5f7fb;
  --surface: #ffffff;
  --text: #1a2233;
  --text-muted: #5a6578;
  --border: #e3e8f0;
  --primary: #4f46e5;
  --primary-hover: #4338ca;
  --accent-gradient: linear-gradient(135deg, #6366f1, #8b5cf6);
  --shadow-sm: 0 1px 2px rgb(20 30 55 / 6%);
  --shadow-md: 0 8px 24px rgb(20 30 55 / 10%);
  --radius: 14px;
  --container: 1100px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f131d;
    --bg-soft: #161b28;
    --surface: #1c2231;
    --text: #e8ecf4;
    --text-muted: #9aa4b8;
    --border: #2a3245;
    --primary: #818cf8;
    --primary-hover: #a5b4fc;
    --shadow-sm: 0 1px 2px rgb(0 0 0 / 40%);
    --shadow-md: 0 8px 24px rgb(0 0 0 / 45%);
  }
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family:
    system-ui,
    -apple-system,
    "Segoe UI",
    Roboto,
    "Helvetica Neue",
    Arial,
    sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.container {
  width: min(100% - 2.5rem, var(--container));
  margin-inline: auto;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-block;
  padding: 0.65rem 1.4rem;
  border-radius: 999px;
  border: 1px solid transparent;
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition:
    background 0.2s,
    color 0.2s,
    border-color 0.2s,
    transform 0.1s;
}

.btn:active {
  transform: scale(0.98);
}

.btn-primary {
  background: var(--primary);
  color: #fff;
}

@media (prefers-color-scheme: dark) {
  .btn-primary {
    color: #10141f;
  }
}

.btn-primary:hover {
  background: var(--primary-hover);
}

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

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

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

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  height: 4rem;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 700;
  font-size: 1.05rem;
  text-decoration: none;
  color: var(--text);
}

.logo-mark {
  font-size: 1.3rem;
}

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.5rem;
  cursor: pointer;
}

.nav-toggle-bar {
  display: block;
  width: 1.2rem;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-menu a:not(.btn) {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  transition: color 0.2s;
}

.nav-menu a:not(.btn):hover {
  color: var(--primary);
}

@media (max-width: 640px) {
  .nav-toggle {
    display: block;
  }

  .nav-menu {
    position: absolute;
    top: 4rem;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-md);
    display: none;
  }

  .nav-menu.open {
    display: flex;
  }

  .nav-menu li {
    border-top: 1px solid var(--border);
  }

  .nav-menu a:not(.btn) {
    display: block;
    padding: 0.9rem 1.25rem;
  }

  .nav-cta {
    margin: 0.75rem 1.25rem;
    text-align: center;
  }
}

/* ---------- Hero ---------- */
.hero {
  padding: clamp(4rem, 10vw, 7.5rem) 0;
  background:
    radial-gradient(600px 300px at 15% 0%, rgb(99 102 241 / 14%), transparent),
    radial-gradient(600px 300px at 85% 10%, rgb(139 92 246 / 12%), transparent),
    var(--bg);
  text-align: center;
}

.hero-badge {
  display: inline-block;
  margin: 0 0 1.25rem;
  padding: 0.3rem 0.9rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  color: var(--primary);
  background: var(--bg-soft);
}

.hero h1 {
  margin: 0;
  font-size: clamp(2.6rem, 8vw, 4.5rem);
  line-height: 1.08;
  letter-spacing: -0.02em;
}

.hero h1 .accent {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-lead {
  max-width: 34rem;
  margin: 1.25rem auto 2rem;
  font-size: clamp(1.05rem, 2.5vw, 1.25rem);
  color: var(--text-muted);
}

.hero-actions {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.hero-stats {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 2.5rem;
  margin: 3rem 0 0;
  padding: 0;
}

.hero-stats div {
  text-align: center;
}

.hero-stats dt {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
}

.hero-stats dd {
  margin: 0.25rem 0 0;
  font-size: 1.4rem;
  font-weight: 700;
}

/* ---------- Features ---------- */
.features {
  padding: clamp(3.5rem, 8vw, 6rem) 0;
  background: var(--bg-soft);
}

.features h2 {
  margin: 0;
  font-size: clamp(1.8rem, 4vw, 2.4rem);
  letter-spacing: -0.01em;
}

.section-lead {
  margin: 0.5rem 0 2.5rem;
  color: var(--text-muted);
}

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

.feature-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  transition:
    transform 0.2s,
    box-shadow 0.2s;
}

.feature-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.feature-icon {
  display: inline-grid;
  place-items: center;
  width: 2.75rem;
  height: 2.75rem;
  margin-bottom: 1rem;
  font-size: 1.4rem;
  border-radius: 12px;
  background: var(--bg-soft);
  border: 1px solid var(--border);
}

.feature-card h3 {
  margin: 0 0 0.4rem;
  font-size: 1.05rem;
}

.feature-card p {
  margin: 0;
  font-size: 0.92rem;
  color: var(--text-muted);
}

/* ---------- CTA ---------- */
.cta {
  padding: clamp(3.5rem, 8vw, 6rem) 0;
  background: var(--bg);
}

.cta-inner {
  text-align: center;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: calc(var(--radius) + 6px);
  padding: clamp(2rem, 5vw, 3.5rem);
}

.cta h2 {
  margin: 0;
  font-size: clamp(1.8rem, 4vw, 2.4rem);
}

.cta p {
  color: var(--text-muted);
  margin: 0.75rem 0 1.5rem;
}

.cta code {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.1rem 0.4rem;
  font-size: 0.9em;
}

.cta-command {
  display: inline-block;
  margin-bottom: 1.5rem;
  padding: 0.6rem 1.2rem;
  font-size: 1.05rem;
  font-family: ui-monospace, "SF Mono", "Cascadia Code", Menlo, Consolas, monospace;
}

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 1.5rem 0;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.site-footer p {
  margin: 0;
}

.site-footer a {
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.2s;
}

.site-footer a:hover {
  color: var(--primary);
}