:root {
  color-scheme: light;
  --font-body: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-heading: 'Playfair Display', 'Times New Roman', serif;
  --color-bg: #f8f7f4;
  --color-surface: #ffffff;
  --color-accent: #1b5f5d;
  --color-accent-soft: #338f8c;
  --color-text: #222222;
  --color-text-muted: #4f565d;
  --color-border: rgba(0, 0, 0, 0.08);
  --radius: 18px;
  --shadow-sm: 0 12px 30px rgba(16, 42, 58, 0.08);
  --shadow-lg: 0 32px 80px rgba(16, 42, 58, 0.14);
  --spacing: clamp(1.5rem, 1.1rem + 1vw, 2.5rem);
}

[data-theme="dark"] {
  color-scheme: dark;
  --color-bg: #0f1719;
  --color-surface: #172125;
  --color-accent: #4ac6c3;
  --color-accent-soft: #68e2df;
  --color-text: #edf5f6;
  --color-text-muted: #94acb5;
  --color-border: rgba(255, 255, 255, 0.08);
  --shadow-sm: 0 12px 32px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 40px 120px rgba(0, 0, 0, 0.55);
}

* {
  box-sizing: border-box;
}

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

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

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

a:hover,
a:focus {
  color: var(--color-accent);
}

main {
  display: block;
}

.container {
  width: min(1100px, 92vw);
  margin: 0 auto;
}

.container.narrow {
  width: min(820px, 90vw);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  backdrop-filter: blur(18px);
  background: color-mix(in srgb, var(--color-bg) 92%, transparent);
  border-bottom: 1px solid var(--color-border);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding: 1.2rem 0;
}

.brand {
  font-family: var(--font-heading);
  font-size: clamp(1.5rem, 1.3rem + 1vw, 2rem);
  font-weight: 700;
  letter-spacing: 0.04em;
}

.nav {
  position: relative;
}

.nav-menu {
  display: flex;
  gap: 0.75rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-menu a {
  padding: 0.45rem 0.85rem;
  border-radius: 999px;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-text-muted);
  transition: background 180ms ease, color 180ms ease, transform 180ms ease;
}

.nav-menu a:hover,
.nav-menu a:focus {
  background: color-mix(in srgb, var(--color-accent) 18%, transparent);
  color: var(--color-text);
  transform: translateY(-1px);
}

.nav-menu a.active {
  color: var(--color-accent);
  background: color-mix(in srgb, var(--color-accent) 16%, transparent);
  font-weight: 600;
}

.nav-toggle {
  display: none;
}

.theme-toggle {
  border: 0;
  background: color-mix(in srgb, var(--color-accent) 18%, transparent);
  color: var(--color-accent);
  padding: 0.5rem 1rem;
  border-radius: 999px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: transform 180ms ease, box-shadow 180ms ease;
}

.theme-toggle:hover,
.theme-toggle:focus {
  transform: translateY(-1px);
  box-shadow: var(--shadow-lg);
}

.hero {
  padding: calc(var(--spacing) * 1.5) 0;
  background: radial-gradient(circle at top right, color-mix(in srgb, var(--color-accent-soft) 32%, transparent) 0%, transparent 55%),
    radial-gradient(circle at bottom left, color-mix(in srgb, var(--color-accent) 22%, transparent) 0%, transparent 60%);
}

.hero h1 {
  font-family: var(--font-heading);
  font-size: clamp(2.5rem, 2.1rem + 2vw, 3.6rem);
  margin-bottom: 1.5rem;
}

.lead {
  font-size: clamp(1.1rem, 1rem + 0.4vw, 1.35rem);
  color: var(--color-text-muted);
  margin-bottom: 1.8rem;
}

.cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.6rem 1.4rem;
  border-radius: 999px;
  border: 1px solid var(--color-border);
  font-weight: 600;
  color: var(--color-text);
  background: var(--color-surface);
  box-shadow: var(--shadow-sm);
  transition: transform 180ms ease, box-shadow 180ms ease, background 180ms ease, color 180ms ease;
}

.button:hover,
.button:focus {
  transform: translateY(-1px);
  box-shadow: var(--shadow-lg);
}

.button.primary {
  background: var(--color-accent);
  color: #ffffff;
  border: none;
}

.ribbon {
  background: color-mix(in srgb, var(--color-accent) 12%, transparent);
  padding: var(--spacing) 0;
}

.metrics {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.6rem;
}

.metric {
  background: var(--color-surface);
  border-radius: var(--radius);
  padding: 1.4rem 1.6rem;
  box-shadow: var(--shadow-sm);
}

.metric-value {
  display: block;
  font-family: var(--font-heading);
  font-size: 1.35rem;
  margin-bottom: 0.35rem;
}

.metric-note {
  color: var(--color-text-muted);
  font-size: 0.95rem;
}

.section {
  padding: var(--spacing) 0;
}

.section h2 {
  font-family: var(--font-heading);
  font-size: clamp(1.9rem, 1.6rem + 0.7vw, 2.3rem);
  margin-bottom: 1rem;
}

.section p {
  margin-bottom: 1.2rem;
  color: var(--color-text-muted);
}

.muted {
  font-style: italic;
}

.cards {
  display: grid;
  gap: 1.5rem;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  margin-bottom: var(--spacing);
}

.card {
  background: var(--color-surface);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  transition: transform 200ms ease, box-shadow 200ms ease;
}

.card:hover,
.card:focus-within {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.card h3 {
  margin-top: 0;
  margin-bottom: 0.6rem;
  font-size: 1.2rem;
  font-weight: 600;
}

.list-block {
  background: color-mix(in srgb, var(--color-accent) 8%, transparent);
  border-radius: var(--radius);
  padding: 1.8rem;
}

.list-block p {
  color: var(--color-text);
}

.site-footer {
  border-top: 1px solid var(--color-border);
  padding: 2.5rem 0;
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.95rem;
}

.site-footer .small {
  margin-top: 0.35rem;
  font-size: 0.85rem;
}

.page-header {
  padding: calc(var(--spacing) * 1.1) 0;
}

.section + .section {
  border-top: 1px solid var(--color-border);
}

@media (max-width: 880px) {
  .nav-menu {
    position: absolute;
    inset: calc(100% + 0.5rem) auto auto 0;
    flex-direction: column;
    background: var(--color-surface);
    border-radius: var(--radius);
    padding: 0.8rem;
    box-shadow: var(--shadow-lg);
    min-width: 220px;
    opacity: 0;
    pointer-events: none;
    transform: translateY(-12px);
    transition: opacity 180ms ease, transform 180ms ease;
  }

  .nav-menu.is-open {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
  }

  .nav-menu a {
    padding: 0.6rem 0.8rem;
    border-radius: 12px;
  }

  .nav-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--color-border);
    background: var(--color-surface);
    color: var(--color-text);
    border-radius: 12px;
    padding: 0.45rem 0.8rem;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
  }

  .nav {
    margin-left: auto;
  }
}

@media (max-width: 640px) {
  .site-header .container {
    flex-wrap: wrap;
    gap: 1rem;
  }

  .theme-toggle {
    margin-left: auto;
  }

  .hero {
    text-align: center;
  }

  .cta {
    justify-content: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}