/* ============================================================
   VOID NOTE — Global Stylesheet
   Nothing-inspired design: pure black, white, red accent, dot matrix typography
   
   FILE STRUCTURE:
   1. CSS Custom Properties (design tokens)
   2. Reset & Base
   3. Typography
   4. Layout Utilities
   5. Navigation
   6. Hero Section
   7. Feature Cards
   8. Security Section
   9. Download CTA
   10. Footer
   11. Policy Pages (Privacy / Terms)
   12. Animations
   13. Responsive (Mobile)
   ============================================================ */


/* ============================================================
   1. CSS CUSTOM PROPERTIES — Design Tokens
   All colors, spacing, font sizes live here.
   Change a value here → changes everywhere automatically.
   ============================================================ */
:root {
  /* Colors — Nothing-inspired monochromatic palette */
  --color-bg:           #000000;    /* True OLED black background */
  --color-surface:      #0D0D0D;    /* Slightly lifted surface for cards */
  --color-surface-2:    #161616;    /* Second-level surface (hover states) */
  --color-border:       #222222;    /* Subtle borders */
  --color-border-light: #333333;    /* Slightly more visible borders */
  --color-text:         #FFFFFF;    /* Primary text — pure white */
  --color-text-muted:   #888888;    /* Secondary text — muted gray */
  --color-text-faint:   #444444;    /* Very faint text, decorative */
  --color-accent:       #FF3B30;    /* Void Note signature red (matches app VoidAccent) */
  --color-accent-dim:   rgba(255, 59, 48, 0.12); /* Accent as subtle glow/fill */

  /* Typography */
  --font-mono:    'Share Tech Mono', 'Courier New', monospace;  /* Dot matrix feel — used for headings, brand */
  --font-body:    'DM Sans', 'Helvetica Neue', sans-serif;      /* Clean, readable body text */
  
  /* Spacing — 8px grid (matches Android app's 8dp grid) */
  --space-xs:   4px;
  --space-sm:   8px;
  --space-md:   16px;
  --space-lg:   24px;
  --space-xl:   32px;
  --space-xxl:  48px;
  --space-3xl:  64px;
  --space-4xl:  96px;
  --space-5xl:  128px;

  /* Layout */
  --max-width:        1120px;
  --nav-height:       64px;
  --border-radius:    4px;          /* Minimal radius — geometric Nothing aesthetic */
  --border-radius-lg: 8px;

  /* Transitions */
  --transition-fast:  150ms ease;
  --transition-base:  250ms ease;
  --transition-slow:  400ms ease;
}


/* ============================================================
   2. RESET & BASE
   Strips browser defaults for a clean slate.
   ============================================================ */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
  /* Subtle dot grid background — the signature Nothing texture */
  background-image: radial-gradient(circle, #1a1a1a 1px, transparent 1px);
  background-size: 24px 24px;
}

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

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

ul, ol {
  list-style: none;
}

button {
  cursor: pointer;
  border: none;
  background: none;
  font-family: inherit;
}


/* ============================================================
   3. TYPOGRAPHY
   Using Share Tech Mono for the "dot matrix" heading aesthetic,
   DM Sans for readable body text.
   ============================================================ */
h1, h2, h3, h4, h5 {
  font-family: var(--font-mono);
  font-weight: 400;               /* Mono fonts look better at regular weight */
  letter-spacing: -0.01em;
  line-height: 1.2;
}

h1 { font-size: clamp(2rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.5rem, 3.5vw, 2.5rem); }
h3 { font-size: clamp(1.1rem, 2.5vw, 1.5rem); }

p {
  color: var(--color-text-muted);
  line-height: 1.7;
}

/* Accent text — the red highlight */
.text-accent { color: var(--color-accent); }
.text-muted  { color: var(--color-text-muted); }
.text-faint  { color: var(--color-text-faint); }

/* Mono label — small dot-matrix caps used for section labels */
.label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-accent);
}


/* ============================================================
   4. LAYOUT UTILITIES
   ============================================================ */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-xl);
}

.section {
  padding: var(--space-5xl) 0;
}

.section--tight {
  padding: var(--space-4xl) 0;
}

/* Divider line — used between sections */
.divider {
  width: 100%;
  height: 1px;
  background: var(--color-border);
}

/* Badge — small pill label */
.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-xs) var(--space-md);
  border: 1px solid var(--color-border-light);
  border-radius: 100px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.15em;
  color: var(--color-text-muted);
}

.badge .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-accent);
  animation: pulse-dot 2s infinite;
}


/* ============================================================
   5. NAVIGATION
   Fixed top nav with blur effect and subtle border.
   ============================================================ */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  z-index: 100;
  border-bottom: 1px solid var(--color-border);
  /* Glassmorphism effect — subtle backdrop blur */
  background: rgba(0, 0, 0, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.nav__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-xl);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* Logo — dot matrix styled brand mark */
.nav__logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.nav__logo-mark {
  width: 28px;
  height: 28px;
  border: 2px solid var(--color-text);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

/* Inner dot of the void circle */
.nav__logo-mark::after {
  content: '';
  width: 6px;
  height: 6px;
  background: var(--color-accent);
  border-radius: 50%;
}

.nav__logo-text {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  letter-spacing: 0.15em;
  color: var(--color-text);
}

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
}

.nav__link {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
}

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

.nav__cta {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-sm) var(--space-md);
  background: var(--color-text);
  color: var(--color-bg);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.15em;
  border-radius: var(--border-radius);
  transition: opacity var(--transition-fast);
}

.nav__cta:hover {
  opacity: 0.85;
}

/* Mobile hamburger — hidden on desktop */
.nav__hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: var(--space-sm);
}

.nav__hamburger span {
  display: block;
  width: 20px;
  height: 1.5px;
  background: var(--color-text);
  transition: transform var(--transition-base);
}


/* ============================================================
   6. HERO SECTION
   Full viewport height, centered. The "first impression."
   ============================================================ */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: var(--nav-height);
  position: relative;
  overflow: hidden;
}

/* Decorative red glow in background */
.hero::before {
  content: '';
  position: absolute;
  top: 20%;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(255, 59, 48, 0.06) 0%, transparent 70%);
  pointer-events: none;
}

.hero__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-xl);
  width: 100%;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-5xl);
  align-items: center;
}

.hero__content {
  /* Stagger animation applied via JS */
}

.hero__eyebrow {
  margin-top: 15px;
  opacity: 0;
  animation: fade-up 0.6s ease forwards 0.2s;
}

.hero__title {
  margin-bottom: var(--space-lg);
  opacity: 0;
  animation: fade-up 0.6s ease forwards 0.4s;
}

/* The large "○" character — the void symbol */
.hero__void-symbol {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(4rem, 10vw, 8rem);
  line-height: 1;
  color: var(--color-text-faint);
  margin-bottom: var(--space-md);
  letter-spacing: -0.05em;
}

.hero__tagline {
  font-size: clamp(1rem, 2.5vw, 1.25rem);
  color: var(--color-text-muted);
  margin-bottom: var(--space-xl);
  opacity: 0;
  animation: fade-up 0.6s ease forwards 0.5s;
  max-width: 480px;
}

.hero__actions {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  flex-wrap: wrap;
  opacity: 0;
  animation: fade-up 0.6s ease forwards 0.65s;
}

/* Stats row under CTA */
.hero__stats {
  display: flex;
  gap: var(--space-xl);
  margin-top: var(--space-xxl);
  padding-top: var(--space-xl);
  border-top: 1px solid var(--color-border);
  opacity: 0;
  animation: fade-up 0.6s ease forwards 0.8s;
}

.hero__stat-value {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  color: var(--color-text);
}

.hero__stat-label {
  font-size: 0.78rem;
  color: var(--color-text-muted);
  margin-top: var(--space-xs);
}

/* Right side: Phone mockup */
.hero__visual {
  display: flex;
  justify-content: center;
  align-items: center;
  opacity: 0;
  animation: fade-in 0.8s ease forwards 0.5s;
}

/* CSS phone mockup — no images needed */
.phone-mockup {
  width: 240px;
  height: 480px;
  border: 2px solid var(--color-border-light);
  border-radius: 32px;
  background: var(--color-surface);
  position: relative;
  overflow: hidden;
  box-shadow: 0 0 60px rgba(255, 59, 48, 0.08), 0 40px 80px rgba(0,0,0,0.6);
}

/* Status bar */
.phone-mockup__status {
  display: flex;
  justify-content: space-between;
  padding: 16px 20px 8px;
  font-family: var(--font-mono);
  font-size: 0.6rem;
  color: var(--color-text-muted);
}

/* Simulated note list in the mockup */
.phone-mockup__content {
  padding: 8px 12px;
}

.phone-note {
  padding: 12px;
  margin-bottom: 8px;
  background: var(--color-surface-2);
  border-radius: 6px;
  border-left: 2px solid transparent;
}

.phone-note--accent { border-left-color: var(--color-accent); }
.phone-note--blue   { border-left-color: #3B82F6; }
.phone-note--green  { border-left-color: #22C55E; }

.phone-note__title {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--color-text);
  margin-bottom: 4px;
}

.phone-note__preview {
  font-size: 0.55rem;
  color: var(--color-text-muted);
  line-height: 1.4;
}

.phone-note__meta {
  display: flex;
  justify-content: space-between;
  margin-top: 6px;
}

.phone-note__time {
  font-family: var(--font-mono);
  font-size: 0.5rem;
  color: var(--color-text-faint);
}

/* Notch decoration at top of phone */
.phone-mockup__notch {
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 80px;
  height: 20px;
  background: var(--color-bg);
  border-radius: 0 0 16px 16px;
}


/* ============================================================
   7. BUTTONS
   Two variants: primary (white fill) and ghost (outline).
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: 14px var(--space-xl);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  border-radius: var(--border-radius);
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.btn--primary {
  background: var(--color-text);
  color: var(--color-bg);
}

.btn--primary:hover {
  background: #DDDDDD;
  transform: translateY(-1px);
}

.btn--ghost {
  background: transparent;
  color: var(--color-text-muted);
  border: 1px solid var(--color-border-light);
}

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

.btn--accent {
  background: var(--color-accent);
  color: var(--color-text);
}

.btn--accent:hover {
  background: #E0352B;
  transform: translateY(-1px);
}

/* Arrow icon in button */
.btn__arrow {
  font-size: 1rem;
  transition: transform var(--transition-fast);
}

.btn:hover .btn__arrow {
  transform: translateX(3px);
}


/* ============================================================
   8. FEATURES SECTION
   3-column grid of feature cards.
   Each card has an icon, title, and description.
   ============================================================ */
.features {
  background: transparent;
}

.section__header {
  text-align: center;
  margin-bottom: var(--space-4xl);
}

.section__label {
  margin-bottom: var(--space-md);
}

.section__title {
  margin-bottom: var(--space-md);
}

.section__subtitle {
  max-width: 540px;
  margin: 0 auto;
  font-size: 1.05rem;
}

/* Feature grid — 3 columns on desktop */
.features__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
}

.feature-card {
  padding: var(--space-xl);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-lg);
  background: var(--color-surface);
  transition: border-color var(--transition-base), transform var(--transition-base), background var(--transition-base);
  position: relative;
  overflow: hidden;
}

.feature-card:hover {
  border-color: var(--color-border-light);
  background: var(--color-surface-2);
  transform: translateY(-2px);
}

/* Subtle top-edge highlight on hover */
.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-accent), transparent);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.feature-card:hover::before {
  opacity: 0.6;
}

/* Icon box */
.feature-card__icon {
  width: 40px;
  height: 40px;
  border: 1px solid var(--color-border-light);
  border-radius: var(--border-radius);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  margin-bottom: var(--space-lg);
  background: var(--color-surface-2);
}

.feature-card__title {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--color-text);
  margin-bottom: var(--space-sm);
  letter-spacing: 0.05em;
}

.feature-card__desc {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  line-height: 1.65;
}

/* Wide feature card — spans 2 columns */
.feature-card--wide {
  grid-column: span 2;
}

/* Feature card with accent left border */
.feature-card--highlighted {
  border-left: 2px solid var(--color-accent);
}


/* ============================================================
   9. SECURITY SECTION
   Full-width dark block emphasizing encryption.
   ============================================================ */
.security {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.security__inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-5xl);
  align-items: center;
}

.security__badge-row {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
  margin-bottom: var(--space-xl);
}

.security__badge {
  padding: var(--space-xs) var(--space-md);
  border: 1px solid var(--color-border-light);
  border-radius: 100px;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.12em;
  color: var(--color-text-muted);
}

.security__title {
  margin-bottom: var(--space-md);
}

.security__desc {
  margin-bottom: var(--space-xl);
  font-size: 1rem;
}

/* Encryption spec list */
.security__specs {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.security__spec {
  display: flex;
  gap: var(--space-md);
  align-items: flex-start;
}

.security__spec-icon {
  width: 32px;
  height: 32px;
  flex-shrink: 0;
  border: 1px solid var(--color-accent);
  border-radius: var(--border-radius);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  color: var(--color-accent);
  margin-top: 2px;
}

.security__spec-title {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--color-text);
  margin-bottom: var(--space-xs);
}

.security__spec-desc {
  font-size: 0.82rem;
  color: var(--color-text-muted);
}

/* Visual side: terminal-style encryption visualization */
.security__visual {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-lg);
  padding: var(--space-xl);
  font-family: var(--font-mono);
  font-size: 0.7rem;
}

.terminal__header {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-md);
  border-bottom: 1px solid var(--color-border);
}

.terminal__dots {
  display: flex;
  gap: 6px;
}

.terminal__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

.terminal__dot--red    { background: #FF5F57; }
.terminal__dot--yellow { background: #FEBC2E; }
.terminal__dot--green  { background: #28C840; }

.terminal__title {
  color: var(--color-text-faint);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
}

.terminal__line {
  color: var(--color-text-muted);
  margin-bottom: var(--space-sm);
  line-height: 1.6;
}

.terminal__line .t-green  { color: #22C55E; }
.terminal__line .t-blue   { color: #60A5FA; }
.terminal__line .t-accent { color: var(--color-accent); }
.terminal__line .t-dim    { color: var(--color-text-faint); }


/* ============================================================
   10. ZERO PROMISE SECTION
   The "No ads, no tracking, no BS" trust builder.
   ============================================================ */
.promise {
  text-align: center;
}

.promise__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-md);
  margin-top: var(--space-4xl);
}

.promise__item {
  padding: var(--space-xl) var(--space-lg);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-lg);
  background: var(--color-surface);
  transition: border-color var(--transition-base);
}

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

.promise__icon {
  font-size: 1.5rem;
  margin-bottom: var(--space-md);
}

.promise__title {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  color: var(--color-text);
  margin-bottom: var(--space-sm);
}

.promise__desc {
  font-size: 0.8rem;
  color: var(--color-text-muted);
}


/* ============================================================
   11. DOWNLOAD / CTA SECTION
   Full-width section with the download button and app store links.
   ============================================================ */
.download {
  text-align: center;
  position: relative;
  overflow: hidden;
}

/* Large decorative void circle */
.download::before {
  content: '○';
  font-family: var(--font-mono);
  font-size: 40vw;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: var(--color-border);
  pointer-events: none;
  line-height: 1;
  opacity: 0.3;
}

.download__inner {
  position: relative;
  z-index: 1;
}

.download__title {
  font-size: clamp(2rem, 5vw, 4rem);
  margin-bottom: var(--space-lg);
}

.download__subtitle {
  font-size: 1.1rem;
  max-width: 480px;
  margin: 0 auto var(--space-xxl);
}

.download__actions {
  display: flex;
  justify-content: center;
  gap: var(--space-md);
  flex-wrap: wrap;
  margin-bottom: var(--space-xl);
}

.download__note {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  color: var(--color-text-faint);
}


/* ============================================================
   12. FOOTER
   Minimal footer with links and legal.
   ============================================================ */
.footer {
  border-top: 1px solid var(--color-border);
  padding: var(--space-xxl) 0 var(--space-xl);
}

.footer__inner {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: var(--space-xl);
  align-items: start;
  margin-bottom: var(--space-xxl);
}

.footer__brand {
  max-width: 300px;
}

.footer__logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
}

.footer__logo-text {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  letter-spacing: 0.15em;
}

.footer__tagline {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  font-style: italic;
}

.footer__links {
  display: flex;
  gap: var(--space-xxl);
}

.footer__col-title {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.2em;
  color: var(--color-text-faint);
  text-transform: uppercase;
  margin-bottom: var(--space-md);
}

.footer__col-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.footer__col-link {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
}

.footer__col-link:hover {
  color: var(--color-text);
}

.footer__bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: var(--space-xl);
  border-top: 1px solid var(--color-border);
}

.footer__copy {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--color-text-faint);
  letter-spacing: 0.08em;
}

.footer__legal {
  display: flex;
  gap: var(--space-lg);
}

.footer__legal-link {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--color-text-faint);
  transition: color var(--transition-fast);
  letter-spacing: 0.08em;
}

.footer__legal-link:hover {
  color: var(--color-text-muted);
}


/* ============================================================
   13. POLICY PAGES (Privacy Policy & Terms of Service)
   Clean document layout for legal pages.
   ============================================================ */
.policy-page {
  padding-top: calc(var(--nav-height) + var(--space-4xl));
  padding-bottom: var(--space-5xl);
}

.policy-page .container {
  max-width: 720px;         /* Narrower column for reading comfort */
}

.policy-header {
  margin-bottom: var(--space-4xl);
  padding-bottom: var(--space-xl);
  border-bottom: 1px solid var(--color-border);
}

.policy-header__label {
  margin-bottom: var(--space-md);
}

.policy-header__title {
  margin-bottom: var(--space-md);
}

.policy-header__meta {
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

.policy-section {
  margin-bottom: var(--space-xxl);
}

.policy-section__title {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-sm);
  border-bottom: 1px solid var(--color-border);
}

.policy-section p {
  margin-bottom: var(--space-md);
  font-size: 0.95rem;
  line-height: 1.75;
}

.policy-section ul {
  margin: var(--space-md) 0 var(--space-md) var(--space-xl);
  list-style: disc;
}

.policy-section ul li {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-sm);
  line-height: 1.65;
}

.policy-contact {
  margin-top: var(--space-4xl);
  padding: var(--space-xl);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-lg);
  background: var(--color-surface);
}

.policy-contact__title {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  margin-bottom: var(--space-sm);
  color: var(--color-text);
}

.policy-contact p {
  font-size: 0.85rem;
}

/* Highlight box — for important notices */
.policy-highlight {
  padding: var(--space-lg);
  border-left: 2px solid var(--color-accent);
  background: var(--color-accent-dim);
  border-radius: 0 var(--border-radius) var(--border-radius) 0;
  margin: var(--space-lg) 0;
}

.policy-highlight p {
  color: var(--color-text);
  font-size: 0.9rem;
  margin: 0;
}


/* ============================================================
   14. ANIMATIONS
   ============================================================ */
@keyframes fade-up {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fade-in {
  from { opacity: 0; }
  to   { opacity: 1; }
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%       { opacity: 0.5; transform: scale(0.8); }
}

/* Stagger animation for cards — applied via JS intersection observer */
.animate-in {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.animate-in.visible {
  opacity: 1;
  transform: translateY(0);
}


/* ============================================================
   15. RESPONSIVE — Mobile
   All breakpoints use mobile-first logic.
   ============================================================ */

/* Tablet: 768px and below */
@media (max-width: 768px) {
  :root {
    --space-4xl: 64px;
    --space-5xl: 80px;
  }

  .container {
    padding: 0 var(--space-md);
  }

  /* Nav — hide links, show hamburger */
  .nav__links {
    display: none;
  }

  .nav__hamburger {
    display: flex;
  }

  /* Mobile nav — full screen overlay */
  .nav__links.open {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--color-bg);
    padding: var(--space-xxl) var(--space-xl);
    gap: var(--space-xl);
    border-top: 1px solid var(--color-border);
    z-index: 99;
  }

  .nav__links.open .nav__link {
    font-size: 1.1rem;
  }

  /* Hero: stack vertically */
  .hero__inner {
    grid-template-columns: 1fr;
    gap: var(--space-xxl);
    text-align: center;
  }

  .hero__visual {
    order: -1;     /* Phone mockup goes on top on mobile */
  }

  .phone-mockup {
    width: 200px;
    height: 380px;
  }

  .hero__tagline {
    margin: 0 auto var(--space-xl);
  }

  .hero__actions {
    justify-content: center;
  }

  .hero__stats {
    justify-content: center;
  }

  /* Features: single column */
  .features__grid {
    grid-template-columns: 1fr;
  }

  .feature-card--wide {
    grid-column: span 1;
  }

  /* Security: stack */
  .security__inner {
    grid-template-columns: 1fr;
    gap: var(--space-xxl);
  }

  /* Promise: 2 columns */
  .promise__grid {
    grid-template-columns: repeat(2, 1fr);
  }

  /* Footer: stack */
  .footer__inner {
    grid-template-columns: 1fr;
  }

  .footer__links {
    flex-wrap: wrap;
    gap: var(--space-xl);
  }

  .footer__bottom {
    flex-direction: column;
    gap: var(--space-md);
    text-align: center;
  }

  .footer__legal {
    justify-content: center;
  }
}

/* Small mobile: 480px and below */
@media (max-width: 480px) {
  .promise__grid {
    grid-template-columns: 1fr;
  }

  .download__actions {
    flex-direction: column;
    align-items: center;
  }
}