/* ==========================================================================
   WifiPass Marketing Site — Shared Stylesheet
   Mobile-first responsive design. Blue/teal brand palette.
   No frameworks, no preprocessors — plain CSS.
   ========================================================================== */

/* ---------- CSS Custom Properties (Design Tokens) ---------- */
:root {
  /* Brand colours */
  --color-primary: #0891b2;       /* teal-600 */
  --color-primary-dark: #0e7490;  /* teal-700 */
  --color-primary-light: #22d3ee; /* teal-400 */
  --color-accent: #06b6d4;       /* cyan-500 */
  --color-bg: #f8fafc;           /* slate-50 */
  --color-surface: #ffffff;
  --color-text: #0f172a;         /* slate-900 */
  --color-text-muted: #64748b;   /* slate-500 */
  --color-border: #e2e8f0;       /* slate-200 */

  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto,
    'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', 'Fira Mono', 'Roboto Mono', monospace;

  /* Spacing scale (4px base) */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  /* Layout */
  --max-width: 72rem; /* 1152px */
  --radius: 0.75rem;
  --radius-sm: 0.5rem;
  --shadow-sm: 0 1px 2px rgba(0,0,0,.05);
  --shadow: 0 4px 6px -1px rgba(0,0,0,.07), 0 2px 4px -2px rgba(0,0,0,.05);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,.08), 0 4px 6px -4px rgba(0,0,0,.04);
}

/* ---------- Reset ---------- */
*, *::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);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
img, svg { display: block; max-width: 100%; }
a { color: var(--color-primary); text-decoration: none; }
a:hover { color: var(--color-primary-dark); }
ul, ol { list-style: none; }

/* ---------- Utility ---------- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--space-4);
}
.sr-only {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

/* ---------- Header / Nav ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 3.5rem;
}
.logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}
.logo svg { width: 28px; height: 28px; }
.nav-links {
  display: flex;
  gap: var(--space-6);
  align-items: center;
}
.nav-links a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-muted);
  transition: color .15s;
}
.nav-links a:hover,
.nav-links a[aria-current="page"] {
  color: var(--color-primary);
}

/* ---------- Hero ---------- */
.hero {
  padding: var(--space-16) 0 var(--space-20);
  text-align: center;
  background: linear-gradient(180deg, #ecfeff 0%, var(--color-bg) 100%);
}
.hero h1 {
  font-size: clamp(2rem, 5vw, 3.25rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.02em;
  max-width: 42rem;
  margin-inline: auto;
}
.hero h1 span { color: var(--color-primary); }
.hero p {
  margin-top: var(--space-4);
  font-size: 1.125rem;
  color: var(--color-text-muted);
  max-width: 36rem;
  margin-inline: auto;
}
.store-badges {
  display: flex;
  gap: var(--space-4);
  justify-content: center;
  margin-top: var(--space-8);
  flex-wrap: wrap;
}
.store-badges a {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.9375rem;
  color: #fff;
  transition: transform .15s, box-shadow .15s;
}
.store-badges a:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  color: #fff;
}
.store-badges .ios { background: #000; }
.store-badges .android { background: var(--color-primary); }

/* ---------- Features ---------- */
.features {
  padding: var(--space-20) 0;
}
.features h2 {
  text-align: center;
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: var(--space-12);
}
.features-grid {
  display: grid;
  gap: var(--space-8);
  grid-template-columns: 1fr;
}
@media (min-width: 640px) {
  .features-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 960px) {
  .features-grid { grid-template-columns: repeat(3, 1fr); }
}
.feature-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--space-6);
  box-shadow: var(--shadow-sm);
  transition: box-shadow .2s, transform .2s;
}
.feature-card:hover {
  box-shadow: var(--shadow);
  transform: translateY(-2px);
}
.feature-icon {
  width: 2.5rem;
  height: 2.5rem;
  border-radius: var(--radius-sm);
  background: #ecfeff;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-4);
  color: var(--color-primary);
  font-size: 1.25rem;
}
.feature-card h3 {
  font-size: 1.0625rem;
  font-weight: 600;
  margin-bottom: var(--space-2);
}
.feature-card p {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  line-height: 1.55;
}

/* ---------- CTA Section ---------- */
.cta {
  padding: var(--space-20) 0;
  text-align: center;
  background: linear-gradient(135deg, #0e7490 0%, #0891b2 50%, #06b6d4 100%);
  color: #fff;
}
.cta h2 {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: var(--space-4);
}
.cta p {
  font-size: 1.0625rem;
  opacity: .85;
  max-width: 32rem;
  margin-inline: auto;
  margin-bottom: var(--space-8);
}
.cta .store-badges a {
  background: rgba(255,255,255,.15);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255,255,255,.25);
}
.cta .store-badges a:hover {
  background: rgba(255,255,255,.25);
}

/* ---------- Footer ---------- */
.site-footer {
  padding: var(--space-12) 0 var(--space-8);
  border-top: 1px solid var(--color-border);
  background: var(--color-surface);
}
.footer-grid {
  display: grid;
  gap: var(--space-8);
  grid-template-columns: 1fr;
  margin-bottom: var(--space-8);
}
@media (min-width: 640px) {
  .footer-grid { grid-template-columns: 2fr 1fr 1fr; }
}
.footer-brand p {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin-top: var(--space-2);
  max-width: 24rem;
}
.footer-links h4 {
  font-size: 0.8125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
  margin-bottom: var(--space-3);
}
.footer-links a {
  display: block;
  font-size: 0.875rem;
  color: var(--color-text);
  padding: var(--space-1) 0;
}
.footer-links a:hover { color: var(--color-primary); }
.footer-bottom {
  border-top: 1px solid var(--color-border);
  padding-top: var(--space-6);
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  text-align: center;
}

/* ---------- Content Pages (Privacy, Terms, About) ---------- */
.page-header {
  padding: var(--space-16) 0 var(--space-8);
  text-align: center;
  background: linear-gradient(180deg, #ecfeff 0%, var(--color-bg) 100%);
}
.page-header h1 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 800;
  letter-spacing: -0.02em;
}
.page-header p {
  margin-top: var(--space-2);
  color: var(--color-text-muted);
  font-size: 0.9375rem;
}
.page-content {
  padding: var(--space-8) 0 var(--space-20);
}
.page-content .container {
  max-width: 48rem;
}
.prose h2 {
  font-size: 1.375rem;
  font-weight: 700;
  margin-top: var(--space-8);
  margin-bottom: var(--space-3);
}
.prose h3 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-top: var(--space-6);
  margin-bottom: var(--space-2);
}
.prose p {
  margin-bottom: var(--space-4);
  color: var(--color-text);
  line-height: 1.7;
}
.prose ul, .prose ol {
  margin-bottom: var(--space-4);
  padding-left: var(--space-6);
}
.prose ul { list-style: disc; }
.prose ol { list-style: decimal; }
.prose li {
  margin-bottom: var(--space-2);
  line-height: 1.6;
  color: var(--color-text);
}
.prose a { text-decoration: underline; }
.prose strong { font-weight: 600; }

/* ---------- About Page Specifics ---------- */
.about-values {
  display: grid;
  gap: var(--space-6);
  grid-template-columns: 1fr;
  margin: var(--space-8) 0;
}
@media (min-width: 640px) {
  .about-values { grid-template-columns: repeat(2, 1fr); }
}
.value-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--space-6);
}
.value-card h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: var(--space-2);
  margin-top: 0;
}
.value-card p {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin-bottom: 0;
}

/* ---------- Mobile Nav Toggle ---------- */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-2);
  color: var(--color-text);
}
.nav-toggle svg { width: 24px; height: 24px; }

@media (max-width: 639px) {
  .nav-toggle { display: flex; }
  .nav-links {
    display: none;
    position: absolute;
    top: 3.5rem;
    left: 0;
    right: 0;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    padding: var(--space-4);
    gap: var(--space-3);
    box-shadow: var(--shadow);
  }
  .nav-links.open { display: flex; }
}

/* ---------- Accessibility ---------- */
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}