:root {
  --font-sans: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont,
    "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
  --font-heading: "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --bg: #f6f7fb;
  --surface: #ffffff;
  --surface-muted: #eef1f7;
  --text: #1f2937;
  --text-muted: #6b7280;
  --primary: #2563eb;
  --primary-soft: rgba(37, 99, 235, 0.12);
  --border: #e5e7eb;
  --shadow-soft: 0 16px 40px rgba(15, 23, 42, 0.08);
  --radius-lg: 18px;
  --radius-md: 12px;
  --radius-sm: 8px;
  --section-gap: clamp(3rem, 8vw, 5rem);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b1220;
    --surface: #121b2f;
    --surface-muted: #1a253c;
    --text: #e5e7eb;
    --text-muted: #9ca3af;
    --primary: #60a5fa;
    --primary-soft: rgba(96, 165, 250, 0.2);
    --border: #1f2937;
    --shadow-soft: 0 20px 50px rgba(10, 16, 30, 0.6);
  }
}

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

html,
body {
  min-height: 100%;
}

body {
  margin: 0;
  display: flex;
  flex-direction: column;
  font-family: var(--font-sans);
  line-height: 1.7;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

main {
  flex: 1;
}

.page-shell {
  padding-inline: clamp(1.25rem, 4vw, 3.5rem);
  width: min(1100px, 100%);
  margin: 0 auto;
}

.page-shell--narrow {
  width: min(900px, 100%);
}

.site-header {
  color: #fff;
  text-align: center;
  position: relative;
  overflow: hidden;
  isolation: isolate;
}

.site-header h1,
.site-header p {
  color: #fff;
}

.site-header::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -2;
  background-image: linear-gradient(
      135deg,
      rgba(15, 23, 42, 0.82),
      rgba(37, 99, 235, 0.78)
    ),
    var(--hero-image, none);
  background-size: cover;
  background-position: center;
  transform: scale(1.03);
}

.site-header::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: linear-gradient(
    180deg,
    rgba(12, 20, 37, 0) 0%,
    rgba(12, 20, 37, 0.55) 100%
  );
}

.hero {
  padding-block: clamp(2.7rem, 6vw, 4.2rem);
}

.hero h1 {
  font-family: var(--font-heading);
  font-size: clamp(2.2rem, 5vw, 3.1rem);
  letter-spacing: -0.02em;
  margin-bottom: 0.75rem;
}

.hero p {
  margin: 0 auto;
  max-width: 540px;
  font-size: clamp(1rem, 2.5vw, 1.2rem);
  color: rgba(255, 255, 255, 0.9);
}

nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(18, 27, 47, 0.9);
  backdrop-filter: blur(10px);
  padding: 0.75rem clamp(1.25rem, 4vw, 3.5rem);
  display: flex;
  justify-content: center;
  gap: clamp(0.75rem, 2vw, 1.5rem);
  box-shadow: 0 12px 30px rgba(15, 23, 42, 0.08);
}

@media (prefers-color-scheme: dark) {
  nav {
    background: rgba(15, 23, 42, 0.88);
    box-shadow: 0 12px 30px rgba(2, 6, 23, 0.65);
  }
}

nav a {
  color: rgba(255, 255, 255, 0.85);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: 0.01em;
  padding: 0.45rem 0.9rem;
  border-radius: var(--radius-sm);
  transition: color 180ms ease, background-color 180ms ease,
    transform 200ms ease;
}

nav a:hover,
nav a:focus-visible {
  color: #fff;
  background: rgba(255, 255, 255, 0.12);
  transform: translateY(-1px);
}

nav a:focus-visible {
  outline: 2px solid #fff;
  outline-offset: 3px;
}

.container {
  padding-block: var(--section-gap);
}

.container .page-shell {
  background: var(--surface);
  border-radius: var(--radius-lg);
  padding: clamp(1.75rem, 3vw, 2.75rem);
  box-shadow: var(--shadow-soft);
}

.section-intro {
  text-align: center;
  margin-bottom: clamp(0.2rem, 2vw, 1rem);
  padding-block: clamp(0.1rem, 0.6vw, 0.3rem);
}

.section-intro h2 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  margin-bottom: 0.2rem;
  font-family: var(--font-heading);
}

.section-intro p {
  max-width: 480px;
  margin: 0.35rem auto 0;
  color: var(--text-muted);
  font-size: clamp(0.95rem, 2vw, 1.05rem);
  line-height: 1.45;
}

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

.feature-card {
  background: var(--surface-muted);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  border: 1px solid var(--border);
  transition: transform 200ms ease, box-shadow 200ms ease,
    border-color 200ms ease;
}

.feature-card:hover,
.feature-card:focus-within {
  transform: translateY(-6px);
  border-color: rgba(37, 99, 235, 0.4);
  box-shadow: 0 18px 40px rgba(15, 23, 42, 0.12);
}

.feature-card h3 {
  margin-top: 0;
  font-size: 1.15rem;
  font-family: var(--font-heading);
}

.feature-card p {
  margin-bottom: 0;
  color: var(--text-muted);
}

.cta-row {
  margin-top: clamp(2.5rem, 6vw, 4rem);
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: center;
  align-items: center;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 600;
  border-radius: 999px;
  padding: 0.7rem 1.4rem;
  text-decoration: none;
  transition: transform 200ms ease, box-shadow 200ms ease,
    background-color 220ms ease;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 12px 25px rgba(37, 99, 235, 0.3);
}

.btn-primary:hover,
.btn-primary:focus-visible {
  transform: translateY(-2px);
  box-shadow: 0 18px 35px rgba(37, 99, 235, 0.38);
}

.btn-ghost {
  background: var(--primary-soft);
  color: var(--primary);
}

.btn-ghost:hover,
.btn-ghost:focus-visible {
  background: rgba(37, 99, 235, 0.18);
  transform: translateY(-2px);
}

.badge-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.4rem 0.8rem;
  border-radius: 999px;
  background: rgba(37, 99, 235, 0.1);
  color: var(--primary);
  font-weight: 600;
  text-decoration: none;
  transition: background-color 200ms ease, transform 200ms ease;
}

.badge-link:hover,
.badge-link:focus-visible {
  background: rgba(37, 99, 235, 0.18);
  transform: translateY(-1px);
}

.contact-highlight {
  margin-top: clamp(2rem, 5vw, 3rem);
  text-align: center;
  color: var(--text-muted);
}

.contact-highlight a {
  color: var(--primary);
  font-weight: 700;
}

footer {
  margin-top: auto;
  background: rgba(15, 23, 42, 0.92);
  color: rgba(255, 255, 255, 0.85);
  text-align: center;
  padding: 1.5rem clamp(1.25rem, 4vw, 3.5rem);
  font-size: 0.95rem;
  letter-spacing: 0.01em;
}

@media (max-width: 720px) {
  nav {
    flex-wrap: wrap;
    gap: 0.5rem;
  }

  nav a {
    padding-inline: 0.75rem;
  }

  .feature-grid {
    grid-template-columns: 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}