/* ============================================================
   Pulans — Design System & Styles
   ============================================================
   Table of Contents:
   1.  Custom Properties (CSS Variables)
   2.  Reset & Base
   3.  Typography
   4.  Layout
   5.  Navigation
   6.  Hero
   7.  Buttons
   8.  Cards
   9.  Sections (About, Apps, Features)
   10. Footer
   11. App-Specific (BabyCare, FAQ, Prose)
   12. Animations
   13. Responsive
   14. Dark Mode
   ============================================================ */

/* ============================================================
   1. Custom Properties
   ============================================================ */
:root {
  /* — Color Palette — */
  --color-bg:            #FAFAFA;
  --color-bg-secondary:  #F3F4F6;
  --color-surface:       #FFFFFF;
  --color-primary:       #111111;
  --color-secondary:     #666666;
  --color-tertiary:      #9CA3AF;
  --color-accent:        #3B82F6;
  --color-accent-hover:  #2563EB;
  --color-accent-subtle: rgba(59, 130, 246, 0.08);
  --color-border:        #E5E7EB;
  --color-border-light:  #F3F4F6;
  --color-glass-bg:      rgba(250, 250, 250, 0.78);
  --color-glass-border:  rgba(255, 255, 255, 0.25);
  --color-success:       #10B981;
  --color-error:         #EF4444;

  /* — Typography — */
  --font-sans:   -apple-system, BlinkMacSystemFont, "SF Pro Display",
                 "Helvetica Neue", "Segoe UI", Roboto, sans-serif;
  --font-mono:   "SF Mono", "Fira Code", "Cascadia Code", monospace;
  --font-size-xs:   0.75rem;
  --font-size-sm:   0.875rem;
  --font-size-base: 1rem;
  --font-size-lg:   1.125rem;
  --font-size-xl:   1.25rem;
  --font-size-2xl:  1.5rem;
  --font-size-3xl:  2rem;
  --font-size-4xl:  2.5rem;
  --font-size-5xl:  3.25rem;
  --font-weight-normal:   400;
  --font-weight-medium:   500;
  --font-weight-semibold: 600;
  --font-weight-bold:     700;
  --line-height-tight:   1.15;
  --line-height-base:    1.5;
  --line-height-relaxed: 1.75;

  /* — Spacing (4px grid) — */
  --space-1:  0.25rem;
  --space-2:  0.5rem;
  --space-3:  0.75rem;
  --space-4:  1rem;
  --space-5:  1.25rem;
  --space-6:  1.5rem;
  --space-8:  2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  /* — Layout — */
  --max-width:      1100px;
  --max-width-narrow: 720px;
  --nav-height:     64px;

  /* — Borders — */
  --radius-sm:    6px;
  --radius-md:    10px;
  --radius-lg:    14px;
  --radius-xl:    20px;
  --radius-full:  9999px;

  /* — Shadows — */
  --shadow-xs:   0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-sm:   0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md:   0 4px 6px rgba(0, 0, 0, 0.05), 0 2px 4px rgba(0, 0, 0, 0.04);
  --shadow-lg:   0 10px 25px rgba(0, 0, 0, 0.06), 0 4px 10px rgba(0, 0, 0, 0.04);
  --shadow-xl:   0 20px 40px rgba(0, 0, 0, 0.08);
  --shadow-card: 0 2px 12px rgba(0, 0, 0, 0.06);

  /* — Transitions — */
  --transition-fast:  120ms cubic-bezier(0.25, 0.1, 0.25, 1);
  --transition-base:  250ms cubic-bezier(0.25, 0.1, 0.25, 1);
  --transition-slow:  400ms cubic-bezier(0.25, 0.1, 0.25, 1);
}

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

html {
  font-size: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  font-size: var(--font-size-base);
  line-height: var(--line-height-base);
  color: var(--color-primary);
  background-color: var(--color-bg);
  min-height: 100vh;
}

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

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

ul {
  list-style: none;
}

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

/* ============================================================
   3. Typography
   ============================================================ */
h1, h2, h3, h4, h5, h6 {
  font-weight: var(--font-weight-semibold);
  line-height: var(--line-height-tight);
  letter-spacing: -0.02em;
}

h1 { font-size: var(--font-size-5xl); }
h2 { font-size: var(--font-size-3xl); }
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }

p {
  color: var(--color-secondary);
  line-height: var(--line-height-relaxed);
}

/* Prose styles for privacy/terms pages */
.prose h1 {
  margin-bottom: var(--space-6);
  font-size: var(--font-size-4xl);
}

.prose h2 {
  margin-top: var(--space-12);
  margin-bottom: var(--space-4);
  font-size: var(--font-size-2xl);
}

.prose p {
  margin-bottom: var(--space-4);
  font-size: var(--font-size-base);
}

.prose ul {
  margin-bottom: var(--space-6);
  padding-left: var(--space-6);
  list-style: disc;
}

.prose li {
  margin-bottom: var(--space-2);
  color: var(--color-secondary);
  line-height: var(--line-height-relaxed);
}

.prose strong {
  color: var(--color-primary);
  font-weight: var(--font-weight-semibold);
}

/* ============================================================
   4. Layout
   ============================================================ */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.container--narrow {
  max-width: var(--max-width-narrow);
}

.section {
  padding: var(--space-20) 0;
}

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

.section__subtitle {
  text-align: center;
  color: var(--color-secondary);
  max-width: 560px;
  margin: 0 auto var(--space-12);
  font-size: var(--font-size-lg);
}

.page {
  padding-top: var(--nav-height);
}

/* ============================================================
   5. Navigation
   ============================================================ */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  z-index: 100;
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: background var(--transition-base),
              border-color var(--transition-base),
              backdrop-filter var(--transition-base);
}

.nav--scrolled {
  background: var(--color-glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-glass-border);
}

.nav__container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.nav__logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  letter-spacing: -0.02em;
  color: var(--color-primary);
}

.nav__logo-icon {
  width: 28px;
  height: 28px;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.nav__link {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-secondary);
  transition: color var(--transition-fast);
  position: relative;
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1.5px;
  background: var(--color-accent);
  transition: width var(--transition-base);
}

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

.nav__link:hover::after {
  width: 100%;
}

/* Mobile menu toggle */
.nav__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 36px;
  height: 36px;
  gap: 5px;
  padding: var(--space-1);
}

.nav__toggle-bar {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-primary);
  border-radius: 2px;
  transition: transform var(--transition-base), opacity var(--transition-base);
}

.nav--menu-open .nav__toggle-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav--menu-open .nav__toggle-bar:nth-child(2) {
  opacity: 0;
}

.nav--menu-open .nav__toggle-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ============================================================
   6. Hero
   ============================================================ */
.hero {
  min-height: 80vh;
  display: flex;
  align-items: center;
  padding: var(--space-20) 0;
  position: relative;
  overflow: hidden;
}

.hero__container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-12);
  align-items: center;
}

.hero__content {
  padding-right: var(--space-8);
}

.hero__tag {
  display: inline-block;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-accent);
  margin-bottom: var(--space-4);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.hero__title {
  font-size: var(--font-size-5xl);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--space-4);
  letter-spacing: -0.03em;
}

.hero__subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-secondary);
  margin-bottom: var(--space-8);
  max-width: 480px;
  line-height: var(--line-height-relaxed);
}

.hero__actions {
  display: flex;
  gap: var(--space-4);
  flex-wrap: wrap;
}

.hero__illustration {
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero__illustration svg {
  width: 100%;
  max-width: 500px;
  height: auto;
}

/* ============================================================
   7. Buttons
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-3) var(--space-6);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
  cursor: pointer;
  gap: var(--space-2);
  white-space: nowrap;
}

.btn--primary {
  background: var(--color-primary);
  color: var(--color-bg);
  border: 1px solid var(--color-primary);
}

.btn--primary:hover {
  background: var(--color-accent);
  border-color: var(--color-accent);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

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

.btn--secondary:hover {
  border-color: var(--color-primary);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

.btn--ghost {
  background: transparent;
  color: var(--color-accent);
  border: none;
  padding: var(--space-3) var(--space-4);
}

.btn--ghost:hover {
  background: var(--color-accent-subtle);
}

/* ============================================================
   8. Cards
   ============================================================ */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--space-6);
}

.card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  box-shadow: var(--shadow-card);
  border: 1px solid var(--color-border);
  transition: transform var(--transition-base),
              box-shadow var(--transition-base);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.card__icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  margin-bottom: var(--space-5);
}

.card__title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-2);
}

.card__description {
  font-size: var(--font-size-sm);
  color: var(--color-secondary);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--space-5);
}

.card--coming-soon {
  opacity: 0.6;
  cursor: default;
}

.card--coming-soon:hover {
  transform: none;
  box-shadow: var(--shadow-card);
}

.card__badge {
  display: inline-block;
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  color: var(--color-tertiary);
  background: var(--color-bg-secondary);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
}

/* ============================================================
   9. Sections (About, Apps, Features)
   ============================================================ */
.about {
  text-align: center;
  background: var(--color-bg-secondary);
}

.about__content {
  max-width: 640px;
  margin: 0 auto;
}

.about__content p {
  font-size: var(--font-size-lg);
  line-height: var(--line-height-relaxed);
}

.apps {
  background: var(--color-bg);
}

/* Feature grid for BabyCare page */
.features {
  background: var(--color-bg-secondary);
}

.features__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-6);
}

.feature-card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  border: 1px solid var(--color-border);
  transition: transform var(--transition-base),
              box-shadow var(--transition-base);
}

.feature-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.feature-card__icon {
  width: 40px;
  height: 40px;
  margin-bottom: var(--space-4);
  color: var(--color-accent);
}

.feature-card__title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-2);
}

.feature-card__description {
  font-size: var(--font-size-sm);
  color: var(--color-secondary);
  line-height: var(--line-height-relaxed);
}

/* Screenshots section */
.screenshots__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
  max-width: 800px;
  margin: 0 auto;
}

.screenshot-frame {
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--color-border);
  aspect-ratio: 9 / 19;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-bg-secondary);
}

.screenshot-frame svg {
  width: 100%;
  height: 100%;
}

/* Download section */
.download {
  text-align: center;
}

.download__buttons {
  display: flex;
  gap: var(--space-4);
  justify-content: center;
  flex-wrap: wrap;
  margin-top: var(--space-8);
}

.download__button {
  display: inline-block;
  transition: transform var(--transition-base), opacity var(--transition-base);
}

.download__button:hover {
  transform: translateY(-2px);
  opacity: 0.9;
}

.download__button svg {
  height: 48px;
  width: auto;
}

/* ============================================================
   10. Footer
   ============================================================ */
.footer {
  background: var(--color-primary);
  color: white;
  padding: var(--space-12) 0;
}

.footer__container {
  display: flex;
  flex-direction: column;
  gap: var(--space-8);
}

.footer__brand {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.footer__logo {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  letter-spacing: -0.02em;
}

.footer__tagline {
  font-size: var(--font-size-sm);
  color: var(--color-tertiary);
}

.footer__links {
  display: flex;
  gap: var(--space-6);
  flex-wrap: wrap;
}

.footer__link {
  font-size: var(--font-size-sm);
  color: var(--color-tertiary);
  transition: color var(--transition-fast);
}

.footer__link:hover {
  color: white;
}

.footer__copy {
  font-size: var(--font-size-xs);
  color: var(--color-tertiary);
  padding-top: var(--space-8);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

/* ============================================================
   11. App-Specific Styles
   ============================================================ */

/* App Hero */
.app-hero {
  padding-top: calc(var(--nav-height) + var(--space-16));
  padding-bottom: var(--space-16);
  text-align: center;
  background: linear-gradient(180deg, var(--color-bg-secondary) 0%, var(--color-bg) 100%);
}

.app-hero__icon {
  width: 96px;
  height: 96px;
  border-radius: var(--radius-xl);
  margin: 0 auto var(--space-6);
  box-shadow: var(--shadow-lg);
}

.app-hero__title {
  font-size: var(--font-size-4xl);
  margin-bottom: var(--space-4);
}

.app-hero__subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-secondary);
  max-width: 560px;
  margin: 0 auto var(--space-8);
  line-height: var(--line-height-relaxed);
}

/* FAQ (Support page) */
.faq {
  max-width: 720px;
  margin: 0 auto;
}

.faq__item {
  border-bottom: 1px solid var(--color-border);
}

.faq__question {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-5) 0;
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  text-align: left;
  transition: color var(--transition-fast);
}

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

.faq__icon {
  width: 20px;
  height: 20px;
  transition: transform var(--transition-base);
  flex-shrink: 0;
}

.faq__item--open .faq__icon {
  transform: rotate(45deg);
}

.faq__answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-slow), padding var(--transition-base);
}

.faq__item--open .faq__answer {
  max-height: 300px;
  padding-bottom: var(--space-5);
}

.faq__answer p {
  font-size: var(--font-size-sm);
  line-height: var(--line-height-relaxed);
}

/* Support contact section */
.support-contact {
  text-align: center;
  padding: var(--space-16) 0;
}

.support-contact__email {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--font-size-lg);
  color: var(--color-accent);
  font-weight: var(--font-weight-medium);
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-md);
  transition: background var(--transition-fast);
}

.support-contact__email:hover {
  background: var(--color-accent-subtle);
}

/* Coming soon page */
.coming-soon {
  min-height: 70vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--space-20) 0;
}

.coming-soon__icon {
  width: 80px;
  height: 80px;
  border-radius: var(--radius-xl);
  margin: 0 auto var(--space-6);
  opacity: 0.5;
}

.coming-soon__title {
  font-size: var(--font-size-3xl);
  margin-bottom: var(--space-4);
}

.coming-soon__description {
  color: var(--color-secondary);
  margin-bottom: var(--space-8);
}

/* Page header for sub-pages */
.page-header {
  padding-top: calc(var(--nav-height) + var(--space-16));
  padding-bottom: var(--space-12);
  text-align: center;
}

.page-header__title {
  font-size: var(--font-size-4xl);
  margin-bottom: var(--space-3);
}

.page-header__subtitle {
  color: var(--color-secondary);
  font-size: var(--font-size-lg);
}

/* Last updated */
.last-updated {
  font-size: var(--font-size-sm);
  color: var(--color-tertiary);
  margin-top: var(--space-12);
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-border);
}

/* ============================================================
   12. Animations
   ============================================================ */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(40px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.92);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

.animate-fade-in {
  animation: fadeIn 0.8s ease forwards;
}

.animate-fade-in-up {
  animation: fadeInUp 0.8s ease forwards;
}

/* Scroll reveal */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s cubic-bezier(0.25, 0.1, 0.25, 1),
              transform 0.6s cubic-bezier(0.25, 0.1, 0.25, 1);
}

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

/* Stagger children */
.fade-in-stagger > .fade-in:nth-child(1) { transition-delay: 0ms; }
.fade-in-stagger > .fade-in:nth-child(2) { transition-delay: 100ms; }
.fade-in-stagger > .fade-in:nth-child(3) { transition-delay: 200ms; }
.fade-in-stagger > .fade-in:nth-child(4) { transition-delay: 300ms; }
.fade-in-stagger > .fade-in:nth-child(5) { transition-delay: 400ms; }
.fade-in-stagger > .fade-in:nth-child(6) { transition-delay: 500ms; }

/* Hero entrance */
.hero__content {
  animation: fadeIn 0.8s ease forwards;
}

.hero__illustration {
  animation: fadeInUp 1s ease forwards;
}

/* 404 page */
.page-404 {
  min-height: 80vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--space-20) 0;
}

.page-404__code {
  font-size: 6rem;
  font-weight: var(--font-weight-bold);
  color: var(--color-border);
  line-height: 1;
  margin-bottom: var(--space-4);
  letter-spacing: -0.04em;
}

.page-404__title {
  font-size: var(--font-size-2xl);
  margin-bottom: var(--space-4);
}

.page-404__description {
  color: var(--color-secondary);
  margin-bottom: var(--space-8);
}

/* ============================================================
   13. Responsive
   ============================================================ */

/* Tablet: 769px - 1024px */
@media (max-width: 1024px) {
  .hero__container {
    grid-template-columns: 1fr;
    gap: var(--space-8);
    text-align: center;
  }

  .hero__content {
    padding-right: 0;
    order: 2;
  }

  .hero__subtitle {
    margin: 0 auto var(--space-8);
  }

  .hero__actions {
    justify-content: center;
  }

  .hero__illustration {
    order: 1;
  }

  .hero__illustration svg {
    max-width: 380px;
  }

  .screenshots__grid {
    grid-template-columns: repeat(2, 1fr);
    max-width: 400px;
  }

  .screenshots__grid .screenshot-frame:last-child {
    display: none;
  }
}

/* Mobile: 480px - 768px */
@media (max-width: 768px) {
  .nav__toggle {
    display: flex;
  }

  .nav__links {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--color-glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    flex-direction: column;
    padding: var(--space-6);
    gap: var(--space-4);
    border-bottom: 1px solid var(--color-glass-border);
    transform: translateY(-100%);
    opacity: 0;
    transition: transform var(--transition-base),
                opacity var(--transition-base);
    pointer-events: none;
  }

  .nav--menu-open .nav__links {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav__link {
    font-size: var(--font-size-base);
    width: 100%;
    padding: var(--space-2) 0;
  }

  h1 { font-size: var(--font-size-4xl); }
  h2 { font-size: var(--font-size-2xl); }

  .hero {
    min-height: auto;
    padding: var(--space-16) 0;
  }

  .hero__title {
    font-size: var(--font-size-4xl);
  }

  .hero__illustration svg {
    max-width: 280px;
  }

  .section {
    padding: var(--space-12) 0;
  }

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

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

  .screenshots__grid {
    grid-template-columns: 1fr;
    max-width: 280px;
  }

  .screenshots__grid .screenshot-frame:nth-child(2) {
    display: none;
  }

  .app-hero__title {
    font-size: var(--font-size-3xl);
  }

  .footer__container {
    gap: var(--space-6);
  }

  .footer__links {
    flex-direction: column;
    gap: var(--space-3);
  }
}

/* Small mobile: < 480px */
@media (max-width: 480px) {
  .container {
    padding: 0 var(--space-4);
  }

  .hero__title {
    font-size: var(--font-size-3xl);
  }

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

  .btn {
    width: 100%;
    max-width: 280px;
  }

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

/* ============================================================
   14. Dark Mode
   ============================================================ */
@media (prefers-color-scheme: dark) {
  :root {
    --color-bg:            #111111;
    --color-bg-secondary:  #1A1A1A;
    --color-surface:       #1E1E1E;
    --color-primary:       #F5F5F5;
    --color-secondary:     #9CA3AF;
    --color-tertiary:      #6B7280;
    --color-accent:        #60A5FA;
    --color-accent-hover:  #3B82F6;
    --color-accent-subtle: rgba(96, 165, 250, 0.1);
    --color-border:        #2D2D2D;
    --color-border-light:  #252525;
    --color-glass-bg:      rgba(17, 17, 17, 0.82);
    --color-glass-border:  rgba(255, 255, 255, 0.06);
    --shadow-xs:  0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-sm:  0 1px 3px rgba(0, 0, 0, 0.35);
    --shadow-md:  0 4px 6px rgba(0, 0, 0, 0.4);
    --shadow-lg:  0 10px 25px rgba(0, 0, 0, 0.5);
    --shadow-xl:  0 20px 40px rgba(0, 0, 0, 0.55);
    --shadow-card: 0 2px 12px rgba(0, 0, 0, 0.4);
  }

  .app-hero {
    background: linear-gradient(180deg, var(--color-bg-secondary) 0%, var(--color-bg) 100%);
  }
}

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

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