@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800;900&display=swap');

:root {
  --color-primary: #4f46e5;
  --color-primary-dark: #4338ca;
  --color-accent: #8b5cf6;
  --color-bg: #f6f7fb;
  --color-surface: #ffffff;
  --color-text: #1e2138;
  --color-muted: #646b8a;
  --color-border: #e5e7f0;
  --radius: 0.75rem;
  --radius-lg: 1rem;
  --shadow-sm: 0 1px 2px rgba(23, 20, 60, 0.06), 0 2px 8px rgba(23, 20, 60, 0.06);
  --shadow-md: 0 12px 32px rgba(23, 20, 60, 0.12);
  --ring: rgba(79, 70, 229, 0.34);
  --gradient-brand: linear-gradient(135deg, #6366f1, #4f46e5 55%, #7c3aed);
  --sidebar-bg: linear-gradient(180deg, #191636 0%, #1e1b4b 100%);
  --font-sans: "Inter", "Segoe UI", system-ui, -apple-system, sans-serif;
  --transition: 0.2s ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  color: var(--color-text);
  background:
    radial-gradient(circle at 86% 10%, rgba(79, 70, 229, 0.1) 0%, transparent 44%),
    radial-gradient(circle at 0% 100%, rgba(139, 92, 246, 0.08) 0%, transparent 34%),
    var(--color-bg);
  font-family: var(--font-sans);
  line-height: 1.6;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

img {
  display: block;
  max-width: 100%;
}

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

button,
select {
  font: inherit;
}

a:focus-visible,
button:focus-visible,
select:focus-visible {
  outline: 2px solid var(--ring);
  outline-offset: 2px;
}

::selection {
  color: #ffffff;
  background: rgba(79, 70, 229, 0.9);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 72px;
  padding: 1rem clamp(1rem, 4vw, 5%);
  background: rgba(255, 255, 255, 0.94);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  backdrop-filter: blur(10px);
}

.brand,
.header-actions {
  display: flex;
  align-items: center;
}

.brand {
  gap: 0.62rem;
  flex: 0 0 auto;
}

.brand-icon {
  width: 34px;
  height: 34px;
  border-radius: 9px;
  box-shadow: 0 3px 10px rgba(79, 70, 229, 0.24);
}

.brand-text {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.02em;
}

.brand-text strong {
  color: var(--color-primary);
}

.header-actions {
  gap: 0.75rem;
}

.header-cta {
  min-height: 36px;
  padding: 0 1.1rem;
  font-size: 0.875rem;
}

/* ── Language toggle ─────────────────────────── */

.lang-toggle {
  display: flex;
  align-items: center;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  padding: 3px;
  gap: 2px;
}

.lang-btn {
  min-width: 32px;
  height: 26px;
  padding: 0 0.5rem;
  border: none;
  border-radius: 999px;
  font: inherit;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--color-muted);
  background: transparent;
  cursor: pointer;
  transition: background var(--transition), color var(--transition);
}

.lang-btn:hover {
  color: var(--color-text);
}

.lang-btn.is-active {
  background: #ffffff;
  color: var(--color-primary);
  box-shadow: 0 1px 4px rgba(15, 23, 42, 0.1);
}

.section {
  position: relative;
  padding: 5rem clamp(1rem, 4vw, 5%);
}

.section-heading {
  width: min(780px, 100%);
  margin: 0 auto 2.2rem;
  text-align: center;
}

.eyebrow {
  display: inline-block;
  margin: 0 0 0.75rem;
  color: var(--color-primary);
  background: #eef2ff;
  border: 1px solid #c7d2fe;
  border-radius: 999px;
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.28rem 0.85rem;
}

h1,
h2,
h3,
p {
  overflow-wrap: anywhere;
}

h1,
h2 {
  margin: 0;
  color: var(--color-text);
  line-height: 1.15;
}

h1 {
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 800;
}

h2 {
  font-size: clamp(1.7rem, 3.3vw, 2.45rem);
  font-weight: 800;
}

h3 {
  margin: 0 0 0.55rem;
  color: var(--color-text);
  font-size: 1.06rem;
  font-weight: 700;
}

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

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  gap: 0.4rem;
  padding: 0 1.2rem;
  border-radius: var(--radius);
  border: 2px solid transparent;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition), transform var(--transition), border-color var(--transition);
}

.button.primary {
  color: #ffffff;
  background: var(--color-primary);
  box-shadow: 0 10px 24px rgba(79, 70, 229, 0.2);
}

.button.primary:hover,
.button.primary:focus-visible {
  background: var(--color-primary-dark);
  transform: translateY(-1px);
}

.button.secondary {
  color: var(--color-primary);
  background: transparent;
  border-color: var(--color-primary);
}

.button.secondary:hover,
.button.secondary:focus-visible {
  background: #eef2ff;
  transform: translateY(-1px);
}

@media (max-width: 600px) {
  .site-header {
    padding-left: 1rem;
    padding-right: 1rem;
  }

  .brand-text {
    font-size: 1.2rem;
  }

  .header-actions {
    gap: 0.5rem;
  }

  .section {
    padding-left: 1rem;
    padding-right: 1rem;
  }
}