:root { --bg: #ffffff; --fg: #111111; --muted: #6b7280; --primary: #0ea5e9; }
:root.dark { --bg: #0b0f14; --fg: #e5e7eb; --muted: #9ca3af; --primary: #38bdf8; }

* { box-sizing: border-box; }
html, body { height: 100%; }
body { margin: 0; font: 16px/1.5 system-ui, -apple-system, Segoe UI, Roboto, sans-serif; background: var(--bg); color: var(--fg); }
.container { max-width: 1000px; margin: 0 auto; padding: 0 1rem; }

.site-header, .site-footer { border-bottom: 1px solid #e5e7eb20; backdrop-filter: saturate(120%) blur(6px); }
.site-header .container, .site-footer .container {
  display: flex; align-items: center; justify-content: space-between; padding: .75rem 1rem;
}
.brand { font-weight: 700; text-decoration: none; color: var(--fg); }
.nav a { margin-left: 1rem; text-decoration: none; color: var(--fg); opacity: .8; }
.nav a:hover { opacity: 1; }

.hero { padding: 6rem 0 4rem; background: radial-gradient(1200px 500px at 50% -200px, #38bdf820, transparent); }
.hero h1 { font-size: clamp(2rem, 4vw, 3rem); margin: 0 0 .5rem; }
.btn {
  display: inline-block; background: var(--primary); color: white; padding: .7rem 1rem;
  border-radius: .7rem; text-decoration: none; border: 0; cursor: pointer;
}

.features { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 1rem; padding: 2rem 0; }
.features article { border: 1px solid #e5e7eb30; border-radius: 1rem; padding: 1rem; background: #ffffff10; }

.about, .contact { padding: 2rem 0; }
.card { border: 1px solid #e5e7eb30; border-radius: 1rem; padding: 1rem; background: #ffffff08; }

label { display: block; margin-bottom: .8rem; }
label span { display: block; font-size: .9rem; color: var(--muted); margin-bottom: .3rem; }
input, textarea { width: 100%; padding: .7rem .8rem; border-radius: .6rem; border: 1px solid #e5e7eb60; background: #fff; color: #111; }
:root.dark input, :root.dark textarea { background: #0f172a; color: #e5e7eb; border-color: #1f2937; }

.form-status { margin-top: .6rem; font-size: .9rem; color: var(--muted); }
.site-footer a { color: var(--muted); text-decoration: none; }

@media (prefers-color-scheme: dark) { :root { color-scheme: dark; } :root:not(.light) { color-scheme: dark; } }