/* ===== Design Tokens ===== */
:root {
  --bg-primary: #0a0e17;
  --bg-secondary: #111827;
  --bg-card: #1a2233;
  --bg-card-hover: #1f2a3f;
  --border-subtle: rgba(56, 189, 248, 0.08);
  --border-accent: rgba(56, 189, 248, 0.2);

  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;

  --accent: #38bdf8;
  --accent-dim: rgba(56, 189, 248, 0.12);
  --accent-glow: rgba(56, 189, 248, 0.25);

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto,
    sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;

  --radius: 12px;
  --radius-sm: 8px;
  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --max-width: 960px;
}

/* ===== Reset & Base ===== */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Subtle background gradient */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 40% at 50% 0%, rgba(56, 189, 248, 0.06), transparent),
    radial-gradient(ellipse 40% 50% at 80% 20%, rgba(99, 102, 241, 0.04), transparent);
  pointer-events: none;
  z-index: -1;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover,
a:focus-visible {
  color: #7dd3fc;
  text-decoration: underline;
  text-underline-offset: 3px;
}

a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 3px;
}

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

/* ===== Typography ===== */
h1, h2, h3, h4 {
  color: var(--text-primary);
  line-height: 1.25;
  letter-spacing: -0.02em;
  font-weight: 700;
}

h1 { font-size: clamp(2rem, 5vw, 3rem); }
h2 { font-size: clamp(1.4rem, 3vw, 1.75rem); margin-bottom: 1rem; }
h3 { font-size: 1.125rem; margin-bottom: 0.5rem; }

p {
  color: var(--text-secondary);
  max-width: 65ch;
}

/* ===== Layout ===== */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

main {
  flex: 1;
}

/* ===== Header ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 14, 23, 0.82);
  backdrop-filter: blur(16px) saturate(1.4);
  -webkit-backdrop-filter: blur(16px) saturate(1.4);
  border-bottom: 1px solid var(--border-subtle);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 700;
  font-size: 1.125rem;
  color: var(--text-primary);
  text-decoration: none;
}

.logo:hover {
  color: var(--accent);
  text-decoration: none;
}

.logo-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background: var(--accent-dim);
  border: 1px solid var(--border-accent);
  border-radius: var(--radius-sm);
  font-size: 1rem;
  transition: background var(--transition), border-color var(--transition);
}

.logo:hover .logo-icon {
  background: var(--accent-glow);
  border-color: var(--accent);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
  list-style: none;
}

.nav-links a {
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  position: relative;
  padding: 0.25rem 0;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  border-radius: 1px;
  transition: width var(--transition);
}

.nav-links a:hover,
.nav-links a[aria-current="page"] {
  color: var(--text-primary);
  text-decoration: none;
}

.nav-links a:hover::after,
.nav-links a[aria-current="page"]::after {
  width: 100%;
}

/* ===== Hero ===== */
.hero {
  padding: 5rem 0 3rem;
  text-align: center;
}

.hero h1 {
  margin-bottom: 1rem;
}

.hero h1 .accent {
  color: var(--accent);
}

.hero-tagline {
  font-size: clamp(1.05rem, 2.5vw, 1.2rem);
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 2rem;
  line-height: 1.65;
}

.hero-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.7rem 1.6rem;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--bg-primary);
  background: var(--accent);
  border-radius: 999px;
  transition: transform var(--transition), box-shadow var(--transition);
}

.hero-cta:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 20px var(--accent-glow);
  color: var(--bg-primary);
  text-decoration: none;
}

/* ===== Sections ===== */
.section {
  padding: 3.5rem 0;
}

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

.section-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.75rem;
}

/* ===== Feature Cards ===== */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.25rem;
  margin-top: 1.5rem;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius);
  padding: 1.5rem;
  transition: border-color var(--transition), transform var(--transition),
    box-shadow var(--transition);
}

.card:hover {
  border-color: var(--border-accent);
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.25);
}

.card-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background: var(--accent-dim);
  font-size: 1.2rem;
  margin-bottom: 1rem;
}

.card h3 {
  color: var(--text-primary);
}

.card p {
  font-size: 0.9rem;
  line-height: 1.6;
}

/* ===== Steps ===== */
.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.5rem;
  margin-top: 1.5rem;
  counter-reset: step;
}

.step {
  counter-increment: step;
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius);
  padding: 1.75rem 1.5rem 1.5rem;
  transition: border-color var(--transition);
}

.step:hover {
  border-color: var(--border-accent);
}

.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--accent);
  color: var(--bg-primary);
  font-size: 0.8rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.step h3 {
  color: var(--text-primary);
}

.step p {
  font-size: 0.9rem;
}

/* ===== Privacy Banner / Data Section ===== */
.data-banner {
  background: var(--bg-card);
  border: 1px solid var(--border-accent);
  border-radius: var(--radius);
  padding: 2rem;
  margin-top: 1.5rem;
}

.data-banner ul {
  list-style: none;
  margin-top: 1rem;
}

.data-banner li {
  position: relative;
  padding-left: 1.5rem;
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 0.6rem;
}

.data-banner li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: 700;
}

/* ===== Privacy Policy Page ===== */
.policy {
  padding: 3rem 0 4rem;
}

.policy h1 {
  margin-bottom: 0.5rem;
}

.policy .last-updated {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 2.5rem;
}

.policy-section {
  margin-bottom: 2.25rem;
}

.policy-section h2 {
  font-size: 1.2rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-subtle);
  margin-bottom: 0.75rem;
}

.policy-section p,
.policy-section li {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
}

.policy-section ul,
.policy-section ol {
  padding-left: 1.25rem;
  margin-top: 0.5rem;
}

.policy-section li {
  margin-bottom: 0.4rem;
}

.policy-section code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: var(--accent-dim);
  padding: 0.15em 0.45em;
  border-radius: 4px;
  color: var(--accent);
  word-break: break-all;
}

.policy-compliance {
  background: var(--bg-card);
  border-left: 3px solid var(--accent);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 1.25rem 1.5rem;
  margin: 1rem 0;
}

.policy-compliance p {
  font-size: 0.95rem;
}

/* ===== Disclaimer ===== */
.disclaimer {
  text-align: center;
  padding: 1.5rem 0;
  font-size: 0.8rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border-subtle);
}

/* ===== Footer ===== */
.site-footer {
  border-top: 1px solid var(--border-subtle);
  padding: 2rem 0;
  margin-top: auto;
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.footer-links {
  display: flex;
  gap: 1.5rem;
  list-style: none;
}

.footer-links a {
  color: var(--text-muted);
  font-size: 0.85rem;
}

.footer-links a:hover {
  color: var(--text-primary);
}

/* ===== 404 Page ===== */
.error-page {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 6rem 1.5rem;
  flex: 1;
}

.error-code {
  font-size: clamp(5rem, 15vw, 8rem);
  font-weight: 800;
  color: var(--accent);
  line-height: 1;
  opacity: 0.2;
  letter-spacing: -0.04em;
}

.error-page h1 {
  font-size: 1.5rem;
  margin: 1rem 0 0.5rem;
}

.error-page p {
  margin-bottom: 2rem;
}

/* ===== Responsive ===== */
@media (max-width: 640px) {
  .header-inner {
    height: 56px;
  }

  .nav-links {
    gap: 1.25rem;
  }

  .hero {
    padding: 3rem 0 2rem;
  }

  .section {
    padding: 2.5rem 0;
  }

  .card-grid,
  .steps {
    grid-template-columns: 1fr;
  }

  .footer-inner {
    flex-direction: column;
    text-align: center;
  }

  .data-banner {
    padding: 1.5rem;
  }
}

/* ===== Reduced Motion ===== */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }

  html {
    scroll-behavior: auto;
  }
}