/* ==========================================================================
   EMET Assist — Design System Tokens & Global Styles
   Strictly aligned with 03_DESIGN_SYSTEM.md
   ========================================================================== */

:root {
  /* Brand Colors */
  --color-primary: #218060;
  --color-primary-dark: #176B52;
  --color-primary-mid: #2E9872;
  --color-primary-light: #DDF3E9;
  --color-primary-surface: #F0FAF6;
  --color-brand-glow: rgba(33, 128, 96, 0.28);

  /* Neutrals & Surfaces */
  --color-bg: #F8FAF9;
  --color-surface: #FFFFFF;
  --color-surface-variant: #F1F4F2;
  --color-border: #DCE3DF;
  --color-border-light: #EAEFEA;
  --color-text-primary: #17211D;
  --color-text-secondary: #65716B;
  --color-text-muted: #8E9993;

  /* Dark Contrast Surfaces (Hero / Dark sections) */
  --color-dark-bg: #0C1A14;
  --color-dark-surface: #142720;
  --color-dark-border: #1E382E;
  --color-dark-text-primary: #F4FFF9;
  --color-dark-text-secondary: #A3B8AF;

  /* Semantic */
  --color-success: #218060;
  --color-warning: #D97706;
  --color-error: #C53D3D;
  --color-info: #4776B8;

  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;

  /* Radii */
  --radius-card: 16px;
  --radius-card-lg: 24px;
  --radius-input: 12px;
  --radius-button: 14px;
  --radius-pill: 9999px;

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(23, 33, 29, 0.04);
  --shadow-md: 0 8px 24px rgba(23, 33, 29, 0.06);
  --shadow-lg: 0 16px 40px rgba(23, 33, 29, 0.08);
  --shadow-glow: 0 0 30px rgba(46, 152, 114, 0.35);

  /* Transitions */
  --transition-fast: 0.18s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.28s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  font-family: var(--font-family);
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  background-color: var(--color-bg);
  color: var(--color-text-primary);
}

body {
  line-height: 1.55;
  overflow-x: hidden;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.num-tabular {
  font-variant-numeric: tabular-nums;
}

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

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

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

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* --------------------------------------------------------------------------
   Header / Navigation
   -------------------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--color-border-light);
  transition: all var(--transition-normal);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
  color: var(--color-text-primary);
}

.brand-app-icon {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  box-shadow: 0 2px 6px rgba(23, 107, 82, 0.25);
  display: block;
  object-fit: cover;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

.nav-link:hover {
  color: var(--color-primary-dark);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* --------------------------------------------------------------------------
   Buttons & CTAs
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 24px;
  font-size: 0.98rem;
  font-weight: 600;
  border-radius: var(--radius-button);
  transition: all var(--transition-normal);
  text-align: center;
  white-space: nowrap;
}

.btn-primary {
  background: var(--color-primary);
  color: #FFFFFF;
  box-shadow: 0 4px 14px rgba(33, 128, 96, 0.3);
}

.btn-primary:hover {
  background: var(--color-primary-dark);
  box-shadow: 0 6px 20px rgba(23, 107, 82, 0.4);
  transform: translateY(-1px);
}

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

.btn-secondary:hover {
  background: var(--color-surface-variant);
  border-color: var(--color-primary);
}

.btn-dark {
  background: #11231B;
  color: #FFFFFF;
  border: 1px solid #1E3D30;
}

.btn-dark:hover {
  background: #193529;
  border-color: var(--color-primary-mid);
}

.btn-lg {
  padding: 16px 28px;
  font-size: 1.05rem;
}

/* --------------------------------------------------------------------------
   Hero Section
   -------------------------------------------------------------------------- */
.hero-section {
  position: relative;
  background: linear-gradient(175deg, #0C1D16 0%, #132A20 50%, #1A372B 100%);
  color: #FFFFFF;
  padding: 80px 0 100px;
  overflow: hidden;
}

.hero-section::before {
  content: "";
  position: absolute;
  top: -20%;
  right: -10%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(46, 152, 114, 0.25) 0%, rgba(12, 29, 22, 0) 70%);
  filter: blur(40px);
  pointer-events: none;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  align-items: center;
  gap: 48px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: rgba(46, 152, 114, 0.18);
  border: 1px solid rgba(123, 212, 174, 0.35);
  color: #7BD4AE;
  font-size: 0.85rem;
  font-weight: 600;
  border-radius: var(--radius-pill);
  margin-bottom: 20px;
  letter-spacing: 0.02em;
}

.hero-title {
  font-size: clamp(2.3rem, 4.2vw, 3.4rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 20px;
  color: #F4FFF9;
}

.hero-title span {
  color: #7BD4AE;
}

.hero-subtitle {
  font-size: 1.15rem;
  line-height: 1.6;
  color: #A3B8AF;
  margin-bottom: 36px;
  max-width: 540px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
  margin-bottom: 36px;
}

.hero-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.hero-chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-pill);
  font-size: 0.82rem;
  font-weight: 500;
  color: #D3E0DA;
}

.hero-chip svg {
  color: #7BD4AE;
}

.hero-mockup-wrapper {
  position: relative;
  display: flex;
  justify-content: center;
}

.hero-mockup-card {
  position: relative;
  width: 100%;
  max-width: 380px;
  border-radius: 36px;
  overflow: hidden;
  box-shadow: 0 25px 60px rgba(0, 0, 0, 0.45), var(--shadow-glow);
  border: 4px solid rgba(255, 255, 255, 0.15);
  background: #000;
  contain: layout paint;
}

.hero-mockup-card img {
  width: 100%;
  height: auto;
  display: block;
}

.hero-floating-stat {
  position: absolute;
  bottom: 24px;
  left: -20px;
  background: rgba(20, 39, 32, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(123, 212, 174, 0.3);
  padding: 16px 20px;
  border-radius: var(--radius-card);
  box-shadow: 0 16px 32px rgba(0, 0, 0, 0.35);
  display: flex;
  align-items: center;
  gap: 14px;
  animation: floatSlow 4s ease-in-out infinite alternate;
  will-change: transform;
}

@keyframes floatSlow {
  0% { transform: translateY(0); }
  100% { transform: translateY(-8px); }
}

.stat-icon-box {
  width: 44px;
  height: 44px;
  background: var(--color-primary);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #FFFFFF;
}

.stat-info-title {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: #A3B8AF;
  margin-bottom: 2px;
}

.stat-info-val {
  font-size: 1.25rem;
  font-weight: 700;
  color: #7BD4AE;
}

/* --------------------------------------------------------------------------
   Features Section
   -------------------------------------------------------------------------- */
.section {
  padding: 100px 0;
}

.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 64px;
}

.section-tag {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-primary);
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(1.8rem, 3.2vw, 2.5rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--color-text-primary);
  margin-bottom: 16px;
  line-height: 1.2;
}

.section-subtitle {
  font-size: 1.1rem;
  color: var(--color-text-secondary);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.feature-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 36px 28px;
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-sm);
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-primary-mid);
  box-shadow: var(--shadow-md);
}

.feature-icon-wrapper {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  background: var(--color-primary-surface);
  border: 1px solid var(--color-primary-light);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
  transition: all var(--transition-normal);
}

.feature-card:hover .feature-icon-wrapper {
  background: var(--color-primary);
  color: #FFFFFF;
  box-shadow: 0 4px 12px rgba(33, 128, 96, 0.3);
}

.feature-card-title {
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin-bottom: 12px;
  color: var(--color-text-primary);
}

.feature-card-desc {
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--color-text-secondary);
}

/* --------------------------------------------------------------------------
   How It Works (Steps)
   -------------------------------------------------------------------------- */
.how-it-works-section {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border-light);
  border-bottom: 1px solid var(--color-border-light);
}

.steps-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  position: relative;
}

.step-card {
  position: relative;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 36px 30px;
}

.step-num {
  font-size: 2.4rem;
  font-weight: 800;
  color: var(--color-primary);
  opacity: 0.35;
  margin-bottom: 16px;
  line-height: 1;
}

.step-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--color-text-primary);
}

.step-desc {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  line-height: 1.55;
}

/* --------------------------------------------------------------------------
   Screenshots Gallery
   -------------------------------------------------------------------------- */
.gallery-section {
  background: var(--color-bg);
  overflow: hidden;
}

.gallery-scroller {
  display: flex;
  gap: 24px;
  overflow-x: auto;
  padding: 20px 24px 40px;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.gallery-item {
  flex: 0 0 280px;
  scroll-snap-align: center;
  background: #000;
  border-radius: 28px;
  overflow: hidden;
  box-shadow: var(--shadow-md);
  border: 3px solid var(--color-surface);
  transition: transform var(--transition-normal);
}

.gallery-item:hover {
  transform: translateY(-6px) scale(1.02);
  box-shadow: var(--shadow-lg);
}

.gallery-item img {
  width: 100%;
  height: auto;
  display: block;
}

/* --------------------------------------------------------------------------
   CTA Box Section
   -------------------------------------------------------------------------- */
.cta-banner {
  background: linear-gradient(145deg, #176B52 0%, #218060 100%);
  border-radius: var(--radius-card-lg);
  padding: 64px 48px;
  color: #FFFFFF;
  text-align: center;
  box-shadow: 0 20px 50px rgba(23, 107, 82, 0.3);
  position: relative;
  overflow: hidden;
}

.cta-banner::after {
  content: "";
  position: absolute;
  top: -50%;
  left: -20%;
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.15) 0%, rgba(255, 255, 255, 0) 70%);
  border-radius: 50%;
  pointer-events: none;
}

.cta-banner-title {
  font-size: clamp(2rem, 3.5vw, 2.8rem);
  font-weight: 700;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.cta-banner-subtitle {
  font-size: 1.15rem;
  max-width: 620px;
  margin: 0 auto 36px;
  color: #E2F5ED;
}

.cta-banner-actions {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 16px;
}

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */
.site-footer {
  background: #0D1612;
  color: #8E9993;
  padding: 60px 0 32px;
  border-top: 1px solid #1C2923;
  margin-top: auto;
}

.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid #1C2923;
}

.footer-brand {
  max-width: 320px;
}

.footer-brand .brand-logo {
  color: #FFFFFF;
  margin-bottom: 14px;
}

.footer-tagline {
  font-size: 0.9rem;
  line-height: 1.5;
  color: #A3B8AF;
}

.footer-links-group {
  display: flex;
  gap: 48px;
  flex-wrap: wrap;
}

.footer-col-title {
  color: #FFFFFF;
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 16px;
}

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

.footer-link {
  font-size: 0.88rem;
  color: #A3B8AF;
  transition: color var(--transition-fast);
}

.footer-link:hover {
  color: #7BD4AE;
}

.footer-bottom {
  padding-top: 32px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.85rem;
}

.footer-ymobidev {
  color: #A3B8AF;
}

.footer-ymobidev a {
  color: #7BD4AE;
  font-weight: 600;
  transition: opacity var(--transition-fast);
}

.footer-ymobidev a:hover {
  text-decoration: underline;
  opacity: 0.9;
}

/* --------------------------------------------------------------------------
   Modal (QR Code Download)
   -------------------------------------------------------------------------- */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(12, 26, 20, 0.75);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-normal);
}

.modal-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.modal-box {
  background: var(--color-surface);
  border-radius: var(--radius-card-lg);
  padding: 40px;
  max-width: 440px;
  width: 100%;
  text-align: center;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.3);
  position: relative;
  transform: translateY(20px);
  transition: transform var(--transition-normal);
}

.modal-overlay.active .modal-box {
  transform: translateY(0);
}

.modal-close-btn {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--color-surface-variant);
  color: var(--color-text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  transition: all var(--transition-fast);
}

.modal-close-btn:hover {
  background: var(--color-border);
  color: var(--color-text-primary);
}

.modal-qr-container {
  margin: 24px auto;
  padding: 16px;
  background: #FFFFFF;
  border-radius: var(--radius-card);
  border: 1px solid var(--color-border);
  display: inline-block;
  box-shadow: var(--shadow-sm);
}

/* --------------------------------------------------------------------------
   Privacy & Legal Page Styles
   -------------------------------------------------------------------------- */
.legal-container {
  max-width: 840px;
  margin: 60px auto 100px;
  padding: 0 24px;
}

.legal-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card-lg);
  padding: 48px;
  box-shadow: var(--shadow-sm);
}

.legal-card h1 {
  font-size: 2.2rem;
  font-weight: 700;
  margin-bottom: 8px;
  letter-spacing: -0.02em;
}

.legal-card .update-date {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin-bottom: 32px;
  display: block;
}

.legal-card h2 {
  font-size: 1.4rem;
  font-weight: 600;
  margin: 36px 0 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-border-light);
  color: var(--color-primary-dark);
}

.legal-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin: 20px 0 8px;
}

.legal-card p, .legal-card li {
  font-size: 0.98rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 14px;
}

.legal-card ul {
  padding-left: 24px;
  margin-bottom: 16px;
}

/* --------------------------------------------------------------------------
   Responsive Breakpoints
   -------------------------------------------------------------------------- */
@media (max-width: 992px) {
  .hero-grid {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 56px;
  }

  .hero-subtitle {
    margin-left: auto;
    margin-right: auto;
  }

  .hero-actions {
    justify-content: center;
  }

  .hero-chips {
    justify-content: center;
  }

  .hero-floating-stat {
    left: 50%;
    transform: translateX(-50%);
    bottom: -20px;
    width: max-content;
  }

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

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

@media (max-width: 768px) {
  .site-header {
    background: rgba(255, 255, 255, 0.95);
  }

  .nav-container {
    height: 60px;
    justify-content: center;
  }

  .brand-logo span {
    font-size: 1.15rem;
  }

  .brand-app-icon {
    width: 32px;
    height: 32px;
    border-radius: 8px;
  }

  .nav-links, .nav-actions {
    display: none;
  }

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

  .cta-banner {
    padding: 48px 24px;
  }

  .legal-card {
    padding: 28px 20px;
  }

  .footer-top {
    flex-direction: column;
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
    gap: 12px;
  }
}