:root {
  --font: 'Inter', system-ui, -apple-system, sans-serif;
  --radius: 16px;
  --transition: 0.3s ease;
}

[data-theme="dark"] {
  --bg: #0b0f14;
  --bg-soft: #11171f;
  --card: #151c25;
  --border: #233040;
  --text: #e6edf5;
  --text-muted: #93a2b4;
  --accent: #4facfe;
  --accent-2: #7d5bff;
  --gradient: linear-gradient(135deg, var(--accent), var(--accent-2));
  --shadow: 0 10px 40px rgba(0, 0, 0, 0.45);
}

[data-theme="light"] {
  --bg: #f6f8fb;
  --bg-soft: #ffffff;
  --card: #ffffff;
  --border: #e2e8f0;
  --text: #0f172a;
  --text-muted: #5b6b7c;
  --accent: #2563eb;
  --accent-2: #7c3aed;
  --gradient: linear-gradient(135deg, var(--accent), var(--accent-2));
  --shadow: 0 10px 40px rgba(15, 23, 42, 0.08);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  transition: background var(--transition), color var(--transition);
}

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

.container {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 8px;
  background: var(--accent);
  color: #fff;
  padding: 8px 16px;
  border-radius: 8px;
  z-index: 100;
}
.skip-link:focus {
  left: 8px;
}

.header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--bg) 80%, transparent);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  height: 68px;
}

.brand {
  font-weight: 800;
  font-size: 1.35rem;
  letter-spacing: -0.02em;
}
.brand-mark {
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.brand-accent {
  color: var(--text);
}
.brand-small {
  font-size: 1.1rem;
}

.nav {
  display: flex;
  gap: 24px;
}
.nav a {
  color: var(--text-muted);
  font-weight: 500;
  transition: color var(--transition);
}
.nav a:hover {
  color: var(--accent);
}

.controls {
  display: flex;
  align-items: center;
  gap: 10px;
}

.lang-switch,
.theme-toggle {
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--text);
  padding: 8px 14px;
  border-radius: 10px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: border-color var(--transition), background var(--transition);
}
.lang-switch:hover,
.theme-toggle:hover {
  border-color: var(--accent);
  color: var(--accent);
}
.theme-toggle {
  width: 40px;
  text-align: center;
}

.hero {
  padding: 110px 0 90px;
  text-align: center;
}
.hero-badge {
  display: inline-block;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--text-muted);
  padding: 6px 16px;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 28px;
}
.hero-title {
  font-size: clamp(2.4rem, 6vw, 4rem);
  line-height: 1.1;
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 24px;
}
.gradient {
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero-sub {
  max-width: 620px;
  margin: 0 auto 40px;
  color: var(--text-muted);
  font-size: 1.15rem;
}
.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  padding: 14px 28px;
  border-radius: 12px;
  font-weight: 600;
  font-size: 1rem;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background var(--transition);
}
.btn:hover {
  transform: translateY(-2px);
}
.btn-primary {
  background: var(--gradient);
  color: #fff;
  box-shadow: var(--shadow);
}
.btn-primary:hover {
  box-shadow: 0 14px 40px rgba(0, 0, 0, 0.3);
}
.btn-ghost {
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--text);
}
.btn-large {
  padding: 16px 36px;
  font-size: 1.1rem;
}

.features {
  padding: 90px 0;
  background: var(--bg-soft);
  border-block: 1px solid var(--border);
  transition: background var(--transition);
}
.section-head {
  text-align: center;
  margin-bottom: 56px;
}
.section-head h2 {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}
.section-sub {
  color: var(--text-muted);
  max-width: 560px;
  margin: 0 auto;
}
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
}
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 26px;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color var(--transition);
}
.card:hover {
  transform: translateY(-6px);
  border-color: var(--accent);
  box-shadow: var(--shadow);
}
.card-icon {
  font-size: 2.2rem;
  margin-bottom: 18px;
}
.card h3 {
  font-size: 1.2rem;
  margin-bottom: 10px;
}
.card p {
  color: var(--text-muted);
  font-size: 0.95rem;
}

.about {
  padding: 90px 0;
}
.about-inner {
  max-width: 820px;
  margin: 0 auto;
  text-align: center;
}
.about-text h2 {
  font-size: clamp(1.8rem, 4vw, 2.4rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 20px;
}
.about-text p {
  color: var(--text-muted);
  font-size: 1.1rem;
}

.cta {
  padding: 90px 0;
  background: var(--bg-soft);
  border-block: 1px solid var(--border);
  transition: background var(--transition);
}
.cta-inner {
  text-align: center;
}
.cta h2 {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}
.cta p {
  color: var(--text-muted);
  margin-bottom: 32px;
}

.footer {
  border-top: 1px solid var(--border);
  padding: 40px 0;
}
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}
.footer-nav {
  display: flex;
  gap: 20px;
}
.footer-nav a {
  color: var(--text-muted);
  transition: color var(--transition);
}
.footer-nav a:hover {
  color: var(--accent);
}
.copyright {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.page {
  padding: 80px 0 90px;
}
.page-header {
  margin-bottom: 48px;
}
.page-header h1 {
  font-size: clamp(1.9rem, 4vw, 2.8rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 8px;
}
.page-header p {
  color: var(--text-muted);
}
.legal h2 {
  font-size: 1.4rem;
  font-weight: 700;
  margin: 36px 0 12px;
}
.legal p,
.legal li {
  color: var(--text-muted);
  margin-bottom: 10px;
}
.legal ul {
  padding-left: 22px;
}
.legal a {
  color: var(--accent);
}
.legal strong {
  color: var(--text);
}
.legal-version[lang="en"] {
  display: none;
}

@media (max-width: 768px) {
  .nav {
    display: none;
  }
  .about-inner {
    grid-template-columns: 1fr;
  }
  .footer-inner {
    flex-direction: column;
    text-align: center;
  }
}