/* LifeOS — Style System v2
   DNA: Space-age, Ethiopian-inspired futurism, premium dark UI
   Mobile-first responsive design
   Fonts: Orbitron (display) + Poppins (body)
*/

/* ============ DESIGN TOKENS ============ */
:root {
  --dark-deep: #050E1A;
  --dark: #0A1929;
  --dark-surface: #0D2137;
  --dark-card: #112840;
  --dark-border: #1A3A5C;
  --dark-border-subtle: rgba(26, 58, 92, 0.4);

  --cyan: #00D4FF;
  --cyan-light: #00FFFF;
  --cyan-dim: #0099CC;
  --neon: #39FF14;
  --orange: #E67E22;
  --purple: #A855F7;
  --rose: #F43F5E;
  --lavender: #C084FC;

  --text-primary: #F0F6FC;
  --text-secondary: #8BA4BE;
  --text-muted: #4A6A8A;

  --font-display: 'Orbitron', monospace, sans-serif;
  --font-body: 'Poppins', -apple-system, BlinkMacSystemFont, sans-serif;

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;

  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
}

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

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

body {
  font-family: var(--font-body);
  background: var(--dark-deep);
  color: var(--text-primary);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  line-height: 1.6;
}

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

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

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

/* ============ MOBILE-FIRST OVERRIDES ============ */
/* Hide mockup on phones — CTA must be above the fold */
@media (max-width: 599px) {
  .hero-mockup {
    display: none !important;
  }

  .hero {
    min-height: auto;
    padding: 90px 20px 40px;
    justify-content: flex-start;
  }

  .hero-title {
    font-size: 28px !important;
    line-height: 1.2;
  }

  .hero-sub {
    font-size: 14px;
  }

  .hero-sub br {
    display: none;
  }

  .hero-actions {
    flex-direction: column;
    gap: 12px;
    width: 100%;
  }

  .hero-actions .btn {
    width: 100%;
    justify-content: center;
  }

  .hero-stats {
    flex-wrap: wrap;
    gap: 16px;
  }

  .hero-stats .stat-divider {
    display: none;
  }

  .hero-pattern {
    display: none;
  }
}

/* ============ NAV ============ */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(5, 14, 26, 0.8);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border-bottom: 1px solid var(--dark-border-subtle);
  transition: background 0.3s;
}

.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 14px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  z-index: 1001;
}

.logo-icon {
  font-size: 22px;
  line-height: 1;
}

.logo-text {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  color: var(--cyan);
  letter-spacing: 2px;
}

/* Hamburger */
.hamburger {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  z-index: 1001;
  -webkit-tap-highlight-color: transparent;
}

.hamburger-line {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-secondary);
  border-radius: 2px;
  transition: all 0.3s var(--ease-out);
  transform-origin: center;
}

.hamburger.active .hamburger-line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.hamburger.active .hamburger-line:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}

.hamburger.active .hamburger-line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Nav links — mobile-first: hidden overlay */
.nav-links {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(5, 14, 26, 0.97);
  backdrop-filter: blur(30px);
  -webkit-backdrop-filter: blur(30px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 32px;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s, visibility 0.3s;
  z-index: 1000;
}

.nav-links.open {
  opacity: 1;
  visibility: visible;
}

.nav-links a {
  color: var(--text-secondary);
  font-size: 18px;
  font-weight: 500;
  transition: color 0.2s;
  letter-spacing: 0.5px;
}

.nav-links a:hover,
.nav-links a:focus {
  color: var(--text-primary);
}

.nav-cta {
  background: var(--cyan) !important;
  color: var(--dark-deep) !important;
  padding: 12px 28px !important;
  border-radius: var(--radius-sm);
  font-weight: 600 !important;
  font-size: 16px !important;
  transition: transform 0.2s var(--ease-spring), box-shadow 0.2s !important;
}

.nav-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 24px rgba(0, 212, 255, 0.35);
}

/* ============ HERO ============ */
.hero {
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 100px 20px 60px;
  position: relative;
  gap: 40px;
  text-align: center;
}

.hero-glow {
  position: absolute;
  top: 15%;
  left: 50%;
  transform: translateX(-50%);
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(0, 212, 255, 0.1) 0%, transparent 70%);
  pointer-events: none;
  animation: pulse-glow 5s ease-in-out infinite;
}

.hero-glow-secondary {
  position: absolute;
  bottom: 10%;
  right: 10%;
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, rgba(168, 85, 247, 0.06) 0%, transparent 70%);
  pointer-events: none;
  animation: pulse-glow 7s ease-in-out infinite reverse;
}

@keyframes pulse-glow {
  0%, 100% { transform: translateX(-50%) scale(1); opacity: 0.5; }
  50% { transform: translateX(-50%) scale(1.3); opacity: 1; }
}

/* Ethiopian cross-inspired decorative patterns */
.hero-pattern {
  position: absolute;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
}

.pattern-svg {
  position: absolute;
  opacity: 0.4;
  animation: spin-slow 60s linear infinite;
}

.pattern-1 {
  width: 300px;
  height: 300px;
  top: 5%;
  right: -5%;
}

.pattern-2 {
  width: 200px;
  height: 200px;
  bottom: 10%;
  left: -3%;
  animation-direction: reverse;
  animation-duration: 80s;
}

@keyframes spin-slow {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.hero-content {
  max-width: 600px;
  position: relative;
  z-index: 1;
}

.hero-tag {
  font-family: var(--font-display);
  font-size: 10px;
  font-weight: 500;
  color: var(--cyan);
  letter-spacing: 4px;
  margin-bottom: 16px;
  opacity: 0.9;
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(32px, 8vw, 60px);
  font-weight: 900;
  line-height: 1.1;
  margin-bottom: 20px;
  letter-spacing: -0.5px;
}

.gradient-text {
  background: linear-gradient(135deg, var(--cyan) 0%, var(--cyan-light) 40%, var(--neon) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-sub {
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-secondary);
  margin-bottom: 32px;
}

.hero-sub strong {
  color: var(--text-primary);
  font-weight: 600;
}

.hero-actions {
  display: flex;
  flex-direction: column;
  gap: 12px;
  align-items: center;
  margin-bottom: 40px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: var(--radius-md);
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 15px;
  text-decoration: none;
  transition: all 0.25s var(--ease-out);
  cursor: pointer;
  border: none;
  white-space: nowrap;
  -webkit-tap-highlight-color: transparent;
}

.btn-icon {
  font-size: 16px;
  line-height: 1;
}

.btn-primary {
  background: var(--cyan);
  color: var(--dark-deep);
  box-shadow: 0 4px 20px rgba(0, 212, 255, 0.2);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(0, 212, 255, 0.4);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-glow {
  position: relative;
}

.btn-glow::before {
  content: '';
  position: absolute;
  inset: -2px;
  border-radius: inherit;
  background: linear-gradient(135deg, var(--cyan), var(--neon));
  opacity: 0;
  z-index: -1;
  filter: blur(12px);
  transition: opacity 0.3s;
}

.btn-glow:hover::before {
  opacity: 0.5;
}

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

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

.btn-lg {
  padding: 16px 40px;
  font-size: 16px;
  border-radius: var(--radius-md);
}

/* Hero stats */
.hero-stats {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
}

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

.stat-value {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 20px;
  color: var(--cyan);
}

.stat-label {
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 4px;
  letter-spacing: 0.5px;
}

.stat-divider {
  width: 1px;
  height: 32px;
  background: var(--dark-border);
}

/* ============ PHONE MOCKUP ============ */
.hero-mockup {
  position: relative;
  z-index: 1;
}

.mockup-phone {
  width: 260px;
  background: var(--dark);
  border-radius: 28px;
  border: 2px solid var(--dark-border);
  padding: 8px;
  box-shadow:
    0 0 80px rgba(0, 212, 255, 0.08),
    0 20px 60px rgba(0, 0, 0, 0.5),
    inset 0 1px 0 rgba(255, 255, 255, 0.05);
  animation: float 6s ease-in-out infinite;
  position: relative;
  overflow: hidden;
}

.mockup-notch {
  width: 100px;
  height: 22px;
  background: var(--dark);
  border-radius: 0 0 16px 16px;
  margin: 0 auto 4px;
  position: relative;
  z-index: 2;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

.mockup-screen {
  background: var(--dark-deep);
  border-radius: 20px;
  padding: 16px 12px;
  min-height: 420px;
}

.mock-header {
  display: flex;
  flex-direction: column;
  margin-bottom: 12px;
}

.mock-greeting {
  font-size: 9px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 2px;
}

.mock-name {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  margin-top: 2px;
}

.mock-date {
  font-size: 10px;
  color: var(--text-secondary);
  margin-top: 2px;
}

.mock-stats {
  display: flex;
  gap: 4px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}

.mock-pill {
  font-size: 9px;
  padding: 3px 7px;
  border-radius: 16px;
  background: color-mix(in srgb, var(--pill-color) 15%, transparent);
  border: 1px solid color-mix(in srgb, var(--pill-color) 30%, transparent);
  color: var(--pill-color);
  font-weight: 500;
  white-space: nowrap;
}

.mock-timeline {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 12px;
}

.mock-event {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 7px 10px;
  border-radius: 8px;
  border-left: 3px solid var(--ev-color);
  background: rgba(255, 255, 255, 0.02);
  transition: background 0.3s;
}

.mock-event-active {
  background: rgba(0, 212, 255, 0.08);
  box-shadow: 0 0 16px rgba(0, 212, 255, 0.08);
}

.mock-time {
  font-family: var(--font-display);
  font-size: 10px;
  color: var(--text-muted);
  width: 36px;
  flex-shrink: 0;
}

.mock-title {
  font-size: 11px;
  color: var(--text-secondary);
  font-weight: 500;
}

.mock-event-active .mock-title {
  color: var(--text-primary);
}

.mock-tasks {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 10px;
  background: var(--dark-surface);
  border-radius: 10px;
  border: 1px solid var(--dark-border-subtle);
}

.mock-task {
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: 10px;
  color: var(--text-secondary);
}

.mock-task-dot {
  width: 3px;
  height: 12px;
  border-radius: 2px;
  flex-shrink: 0;
}

.mock-task-status {
  margin-left: auto;
  font-size: 8px;
  font-weight: 600;
  letter-spacing: 1px;
  color: var(--text-muted);
}

.mock-task-status.wip {
  color: var(--cyan);
}

/* ============ SCROLL INDICATOR ============ */
.scroll-indicator {
  display: flex;
  justify-content: center;
  padding: 0 0 40px;
}

.scroll-line {
  width: 1px;
  height: 48px;
  background: linear-gradient(to bottom, var(--cyan), transparent);
  animation: scroll-pulse 2s ease-in-out infinite;
}

@keyframes scroll-pulse {
  0%, 100% { opacity: 0.3; height: 48px; }
  50% { opacity: 1; height: 64px; }
}

/* ============ SECTIONS (shared) ============ */
.section-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.section-tag {
  font-family: var(--font-display);
  font-size: 10px;
  font-weight: 500;
  color: var(--cyan);
  letter-spacing: 4px;
  margin-bottom: 14px;
  text-align: center;
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(24px, 5vw, 42px);
  font-weight: 700;
  text-align: center;
  line-height: 1.2;
  margin-bottom: 48px;
}

/* ============ FEATURES ============ */
.features {
  padding: 80px 0;
  background: linear-gradient(180deg, var(--dark-deep) 0%, var(--dark) 100%);
  position: relative;
}

.features::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 200px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--cyan-dim), transparent);
}

.features-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.feature-card {
  background: var(--dark-surface);
  border: 1px solid var(--dark-border-subtle);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  transition: transform 0.4s var(--ease-out), border-color 0.3s, box-shadow 0.3s;
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--glow, var(--cyan)), transparent);
  opacity: 0;
  transition: opacity 0.3s;
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: color-mix(in srgb, var(--glow, var(--cyan)) 40%, transparent);
  box-shadow: 0 8px 40px rgba(0, 212, 255, 0.08);
}

.feature-card:hover::before {
  opacity: 1;
}

.feature-icon-wrap {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
  background: color-mix(in srgb, var(--glow, var(--cyan)) 8%, transparent);
  border: 1px solid color-mix(in srgb, var(--glow, var(--cyan)) 20%, transparent);
  transition: background 0.3s;
}

.feature-card:hover .feature-icon-wrap {
  background: color-mix(in srgb, var(--glow, var(--cyan)) 15%, transparent);
}

.feature-svg {
  width: 28px;
  height: 28px;
  color: var(--glow, var(--cyan));
}

.feature-card h3 {
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 700;
  margin-bottom: 10px;
  letter-spacing: 0.5px;
}

.feature-card p {
  font-size: 13px;
  line-height: 1.7;
  color: var(--text-secondary);
}

/* ============ PHILOSOPHY / SOCIAL PROOF ============ */
.philosophy {
  padding: 80px 0;
  position: relative;
}

.philosophy::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 200px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--purple), transparent);
}

.philosophy-grid {
  display: flex;
  flex-direction: column;
  gap: 48px;
}

.philosophy-text {
  max-width: 560px;
}

.philosophy-title {
  font-family: var(--font-display);
  font-size: clamp(24px, 5vw, 36px);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 20px;
}

.philosophy-body {
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-secondary);
  margin-bottom: 16px;
}

.philosophy-body em {
  color: var(--cyan);
  font-style: normal;
  font-weight: 500;
}

.philosophy-metrics {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.metric-card {
  padding: 24px 20px;
  border-radius: var(--radius-md);
  border: 1px solid var(--dark-border-subtle);
  background: var(--dark-surface);
  display: flex;
  flex-direction: column;
  transition: border-color 0.3s;
}

.metric-card:hover {
  border-color: var(--cyan-dim);
}

.metric-value {
  font-family: var(--font-display);
  font-size: 32px;
  font-weight: 800;
  color: var(--cyan);
  line-height: 1;
}

.metric-label {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary);
  margin-top: 8px;
}

.metric-detail {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 4px;
}

/* ============ WHY / COMPARISON ============ */
.why {
  padding: 80px 0;
  background: linear-gradient(180deg, var(--dark) 0%, var(--dark-deep) 100%);
}

.comparison {
  display: flex;
  flex-direction: column;
  gap: 20px;
  max-width: 900px;
  margin: 0 auto;
}

.compare-old, .compare-new {
  padding: 28px 24px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--dark-border-subtle);
}

.compare-old {
  background: rgba(244, 63, 94, 0.03);
  border-color: rgba(244, 63, 94, 0.15);
}

.compare-new {
  background: rgba(0, 212, 255, 0.03);
  border-color: rgba(0, 212, 255, 0.15);
}

.compare-old h4, .compare-new h4 {
  font-family: var(--font-display);
  font-size: 12px;
  letter-spacing: 2px;
  margin-bottom: 16px;
}

.compare-old h4 { color: var(--rose); }
.compare-new h4 { color: var(--cyan); }

.comparison ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.comparison li {
  font-size: 13px;
  color: var(--text-secondary);
  display: flex;
  align-items: flex-start;
  gap: 10px;
  line-height: 1.6;
}

.x { color: var(--rose); font-weight: 700; flex-shrink: 0; }
.check { color: var(--cyan); flex-shrink: 0; }

.old-total {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid rgba(244, 63, 94, 0.12);
  color: var(--text-muted) !important;
  font-style: italic;
  font-size: 12px !important;
}

.new-total {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid rgba(0, 212, 255, 0.12);
  color: var(--cyan) !important;
  font-weight: 600;
}

.compare-vs {
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-size: 12px;
  color: var(--text-muted);
  letter-spacing: 3px;
  padding: 4px 0;
}

/* ============ TECH ============ */
.tech {
  padding: 80px 0;
  position: relative;
}

.tech::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 200px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--neon), transparent);
  opacity: 0.5;
}

.tech-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  max-width: 800px;
  margin: 0 auto;
}

.tech-item {
  padding: 24px;
  border-radius: var(--radius-md);
  border: 1px solid var(--dark-border-subtle);
  background: var(--dark-surface);
  transition: border-color 0.3s;
}

.tech-item:hover {
  border-color: var(--cyan-dim);
}

.tech-badge {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 10px;
  font-weight: 700;
  color: var(--cyan);
  letter-spacing: 2px;
  padding: 4px 12px;
  border: 1px solid rgba(0, 212, 255, 0.25);
  border-radius: 6px;
  margin-bottom: 12px;
  background: rgba(0, 212, 255, 0.05);
}

.tech-item p {
  font-size: 13px;
  line-height: 1.7;
  color: var(--text-secondary);
}

/* ============ CTA ============ */
.cta-section {
  padding: 80px 0;
  text-align: center;
  position: relative;
  background: linear-gradient(180deg, var(--dark) 0%, var(--dark-deep) 100%);
}

.cta-glow {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 400px;
  height: 300px;
  background: radial-gradient(ellipse, rgba(0, 212, 255, 0.06) 0%, transparent 70%);
  pointer-events: none;
}

.cta-sub {
  font-size: 15px;
  color: var(--text-secondary);
  margin-bottom: 32px;
  max-width: 420px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.7;
}

.cta-actions {
  display: flex;
  justify-content: center;
  margin-bottom: 20px;
}

.cta-note {
  font-size: 12px;
  color: var(--text-muted);
  max-width: 400px;
  margin: 0 auto;
}

/* ============ FOOTER ============ */
.footer {
  padding: 48px 0 32px;
  border-top: 1px solid var(--dark-border-subtle);
}

.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.footer-brand {
  margin-bottom: 32px;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
}

.footer-tagline {
  color: var(--text-muted);
  font-size: 13px;
}

.footer-columns {
  display: flex;
  gap: 48px;
  margin-bottom: 32px;
}

.footer-col {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-col h5 {
  font-family: var(--font-display);
  font-size: 10px;
  letter-spacing: 2px;
  color: var(--text-muted);
  text-transform: uppercase;
  margin-bottom: 4px;
}

.footer-col a {
  color: var(--text-secondary);
  font-size: 13px;
  transition: color 0.2s;
}

.footer-col a:hover {
  color: var(--cyan);
}

.footer-bottom {
  padding-top: 24px;
  border-top: 1px solid var(--dark-border-subtle);
}

.footer-copy {
  font-size: 12px;
  color: var(--text-muted);
}

/* ============ ANIMATIONS ============ */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s var(--ease-out), transform 0.7s var(--ease-out);
}

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

/* Stagger delay for grid items */
.feature-card:nth-child(1) { transition-delay: 0ms; }
.feature-card:nth-child(2) { transition-delay: 80ms; }
.feature-card:nth-child(3) { transition-delay: 160ms; }
.feature-card:nth-child(4) { transition-delay: 240ms; }
.feature-card:nth-child(5) { transition-delay: 320ms; }
.feature-card:nth-child(6) { transition-delay: 400ms; }

.metric-card:nth-child(1) { transition-delay: 0ms; }
.metric-card:nth-child(2) { transition-delay: 100ms; }
.metric-card:nth-child(3) { transition-delay: 200ms; }
.metric-card:nth-child(4) { transition-delay: 300ms; }

/* ============ RESPONSIVE — TABLET (600px+) ============ */
@media (min-width: 600px) {
  .nav-inner {
    padding: 16px 32px;
  }

  .hero {
    padding: 120px 32px 80px;
    gap: 48px;
  }

  .hero-tag {
    font-size: 11px;
  }

  .hero-sub {
    font-size: 16px;
  }

  .hero-actions {
    flex-direction: row;
    gap: 16px;
  }

  .stat-value {
    font-size: 24px;
  }

  .mockup-phone {
    width: 280px;
  }

  .mockup-screen {
    min-height: 480px;
    padding: 20px 14px;
  }

  .section-inner {
    padding: 0 32px;
  }

  .features {
    padding: 100px 0;
  }

  .features-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }

  .feature-card {
    padding: 32px;
  }

  .feature-card h3 {
    font-size: 15px;
  }

  .feature-card p {
    font-size: 14px;
  }

  .philosophy {
    padding: 100px 0;
  }

  .philosophy-metrics {
    gap: 20px;
  }

  .metric-value {
    font-size: 36px;
  }

  .why {
    padding: 100px 0;
  }

  .comparison {
    flex-direction: row;
    align-items: stretch;
    gap: 24px;
  }

  .compare-old, .compare-new {
    flex: 1;
    padding: 32px;
  }

  .compare-vs {
    padding: 0;
    flex-shrink: 0;
  }

  .tech {
    padding: 100px 0;
  }

  .tech-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }

  .cta-section {
    padding: 100px 0;
  }

  .footer-columns {
    gap: 64px;
  }
}

/* ============ RESPONSIVE — DESKTOP (900px+) ============ */
@media (min-width: 900px) {
  /* Show desktop nav, hide hamburger */
  .hamburger {
    display: none;
  }

  .nav-links {
    position: static;
    flex-direction: row;
    background: none;
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    opacity: 1;
    visibility: visible;
    gap: 32px;
  }

  .nav-links a {
    font-size: 14px;
  }

  .nav-cta {
    padding: 8px 24px !important;
    font-size: 14px !important;
  }

  .nav-inner {
    padding: 16px 40px;
  }

  /* Hero side-by-side */
  .hero {
    flex-direction: row;
    text-align: left;
    padding: 120px 40px 80px;
    gap: 60px;
    max-width: 1400px;
    margin: 0 auto;
  }

  .hero-content {
    flex: 1;
  }

  .hero-mockup {
    flex-shrink: 0;
  }

  .hero-actions {
    justify-content: flex-start;
  }

  .hero-stats {
    justify-content: flex-start;
  }

  .section-inner {
    padding: 0 40px;
  }

  .features {
    padding: 120px 0;
  }

  .features-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
  }

  .philosophy {
    padding: 120px 0;
  }

  .philosophy-grid {
    flex-direction: row;
    align-items: center;
    gap: 64px;
  }

  .philosophy-text {
    flex: 1;
  }

  .philosophy-metrics {
    flex: 1;
    max-width: 440px;
  }

  .section-tag {
    font-size: 11px;
  }

  .why {
    padding: 120px 0;
  }

  .comparison {
    gap: 32px;
  }

  .comparison li {
    font-size: 14px;
  }

  .tech {
    padding: 120px 0;
  }

  .cta-section {
    padding: 120px 0;
  }

  .mockup-phone {
    width: 300px;
  }

  .mockup-screen {
    min-height: 500px;
    padding: 20px 16px;
  }

  .footer-inner {
    display: grid;
    grid-template-columns: 1fr auto;
    grid-template-rows: auto auto;
    gap: 0 64px;
    padding: 0 40px;
  }

  .footer-brand {
    grid-row: 1;
    grid-column: 1;
  }

  .footer-columns {
    grid-row: 1;
    grid-column: 2;
    margin-bottom: 0;
  }

  .footer-bottom {
    grid-row: 2;
    grid-column: 1 / -1;
    margin-top: 32px;
  }
}

/* ============ RESPONSIVE — LARGE (1200px+) ============ */
@media (min-width: 1200px) {
  .hero {
    padding: 140px 60px 100px;
    gap: 80px;
  }

  .hero-title {
    font-size: 56px;
  }

  .hero-sub {
    font-size: 17px;
  }

  .section-title {
    font-size: 42px;
  }

  .philosophy-title {
    font-size: 36px;
  }

  .mockup-phone {
    width: 320px;
  }
}

/* ============ SAFE AREA (notched devices) ============ */
@supports (padding: env(safe-area-inset-bottom)) {
  .footer {
    padding-bottom: calc(32px + env(safe-area-inset-bottom));
  }

  .nav-inner {
    padding-left: max(20px, env(safe-area-inset-left));
    padding-right: max(20px, env(safe-area-inset-right));
  }
}

/* ============ REDUCED MOTION ============ */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  html {
    scroll-behavior: auto;
  }

  .fade-in {
    opacity: 1;
    transform: none;
  }
}

/* ============ SELECTION ============ */
::selection {
  background: rgba(0, 212, 255, 0.25);
  color: var(--text-primary);
}

/* ============ SCROLLBAR ============ */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--dark-deep);
}

::-webkit-scrollbar-thumb {
  background: var(--dark-border);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}