/* ==========================================================================
   SkipMate Official Landing Page — Core Design System & Styles
   Mobile-First • Premium Dark Theme • Fully Responsive
   ========================================================================== */

/* 1. Design Tokens & Variables */
:root {
  --bg-primary: #07090E;
  --bg-secondary: #0D101C;
  --bg-surface: #111524;
  --bg-card: #141829;
  --bg-card-hover: #1A2036;
  --bg-card-elevated: #1D243D;
  
  --border-subtle: #1C2237;
  --border-card: #232A44;
  --border-highlight: #333D63;
  --border-primary: rgba(99, 91, 255, 0.4);
  
  --primary: #635BFF;
  --primary-hover: #4F46E5;
  --primary-light: #818CF8;
  --primary-glow: rgba(99, 91, 255, 0.35);
  
  --sky-blue: #38BDF8;
  --sky-glow: rgba(56, 189, 248, 0.3);
  --cyan: #06B6D4;
  --emerald: #10B981;
  --emerald-glow: rgba(16, 185, 129, 0.25);
  --amber: #F59E0B;
  --rose: #F43F5E;
  
  --text-main: #F8FAFC;
  --text-sub: #94A3B8;
  --text-muted: #64748B;
  --text-disabled: #475569;
  
  --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-display: 'Outfit', 'Plus Jakarta Sans', sans-serif;
  
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-full: 9999px;
  
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.45);
  --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.6);
  --shadow-glow: 0 0 35px var(--primary-glow);
  
  --container-max: 1200px;
  --header-height: 72px;
}

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

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

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  background-color: var(--bg-primary);
  color: var(--text-main);
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
}

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

a {
  color: inherit;
  text-decoration: none;
  transition: color 0.2s ease, opacity 0.2s ease;
}

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

ul, ol {
  list-style: none;
}

/* Accessible focus ring */
:focus-visible {
  outline: 2px solid var(--sky-blue);
  outline-offset: 3px;
}

/* Container */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
}

/* Section Common */
.section {
  padding-top: 64px;
  padding-bottom: 64px;
  position: relative;
}

.text-center {
  text-align: center;
}

.section-header {
  margin-bottom: 40px;
}

.section-badge {
  display: inline-block;
  padding: 6px 14px;
  border-radius: var(--radius-full);
  background: rgba(99, 91, 255, 0.12);
  border: 1px solid rgba(99, 91, 255, 0.3);
  color: var(--primary-light);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 12px;
}

.section-title {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 800;
  line-height: 1.2;
  color: var(--text-main);
  letter-spacing: -0.02em;
  margin-bottom: 14px;
}

.section-subtitle {
  font-size: 1rem;
  color: var(--text-sub);
  max-width: 640px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.6;
}

.gradient-text {
  background: linear-gradient(135deg, #FFFFFF 20%, #38BDF8 60%, #818CF8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* 3. Announcement Top Bar */
.announcement-bar {
  background: linear-gradient(90deg, #111524, #181E33);
  border-bottom: 1px solid var(--border-subtle);
  padding: 8px 0;
  font-size: 0.82rem;
  color: var(--text-sub);
}

.announcement-content {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  flex-wrap: wrap;
  text-align: center;
}

.badge-android {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 3px 9px;
  border-radius: var(--radius-full);
  background: rgba(56, 189, 248, 0.15);
  color: var(--sky-blue);
  font-weight: 700;
  font-size: 0.75rem;
}

.announcement-text {
  color: var(--text-main);
  font-weight: 500;
}

.announcement-link {
  color: var(--sky-blue);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.announcement-link:hover {
  color: #FFFFFF;
}

/* 4. Navigation Bar */
.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  height: var(--header-height);
  background: rgba(7, 9, 14, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  transition: background 0.3s ease, border-color 0.3s ease;
}

.navbar.scrolled {
  background: rgba(7, 9, 14, 0.96);
  border-bottom-color: var(--border-card);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
}

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

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

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

.brand-text {
  display: flex;
  align-items: center;
  gap: 8px;
}

.brand-name {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-main);
}

.brand-badge {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  padding: 2px 7px;
  border-radius: var(--radius-sm);
  background: rgba(99, 91, 255, 0.2);
  color: var(--primary-light);
  border: 1px solid rgba(99, 91, 255, 0.3);
}

/* Desktop Nav Links */
.nav-links {
  display: none;
  align-items: center;
  gap: 28px;
}

.nav-link {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-sub);
  position: relative;
  padding: 6px 0;
}

.nav-link:hover, .nav-link:focus {
  color: var(--text-main);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--sky-blue);
  transition: width 0.25s ease;
}

.nav-link:hover::after {
  width: 100%;
}

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

/* Hamburger button */
.hamburger-btn {
  display: flex;
  flex-direction: column;
  justify-content: space-around;
  width: 38px;
  height: 38px;
  padding: 8px;
  border-radius: var(--radius-sm);
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  cursor: pointer;
  z-index: 1010;
}

.hamburger-line {
  width: 100%;
  height: 2px;
  background-color: var(--text-main);
  border-radius: 2px;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

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

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

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

/* Mobile Drawer */
.mobile-drawer {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(7, 9, 14, 0.98);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  z-index: 2500;
  display: flex;
  flex-direction: column;
  padding: 16px 20px 24px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: opacity 0.25s ease, transform 0.25s ease, visibility 0.25s;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

.mobile-drawer.open {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.mobile-drawer-content {
  display: flex;
  flex-direction: column;
  min-height: 100%;
}

.mobile-drawer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 14px;
  margin-bottom: 16px;
  border-bottom: 1px solid var(--border-subtle);
}

.mobile-drawer-close {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  color: var(--text-main);
  font-size: 1.6rem;
  line-height: 1;
  cursor: pointer;
  touch-action: manipulation;
}

.mobile-drawer-close:active {
  background: var(--bg-card-hover);
  color: var(--sky-blue);
}

.mobile-nav-links {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 24px;
}

.mobile-nav-link {
  padding: 14px 16px;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-main);
  border-radius: var(--radius-md);
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  touch-action: manipulation;
  display: block;
}

.mobile-nav-link:active, .mobile-nav-link:hover {
  background: var(--bg-card-hover);
  color: var(--sky-blue);
  border-color: var(--sky-blue);
}

.mobile-drawer-cta {
  margin-top: auto;
  padding-top: 16px;
}

.mobile-file-info {
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 10px;
}

/* 5. Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  font-family: var(--font-sans);
  font-weight: 700;
  border-radius: var(--radius-md);
  padding: 12px 22px;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.2s ease, background 0.2s ease, border-color 0.2s ease;
  text-align: center;
  white-space: nowrap;
}

.btn:active {
  transform: scale(0.98);
}

.btn-primary {
  background: linear-gradient(135deg, #635BFF, #4F46E5);
  color: #FFFFFF;
  box-shadow: 0 4px 16px var(--primary-glow);
  border: 1px solid rgba(255, 255, 255, 0.15);
}

.btn-primary:hover {
  background: linear-gradient(135deg, #726BFF, #5B52F2);
  box-shadow: 0 6px 24px rgba(99, 91, 255, 0.5);
  color: #FFFFFF;
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text-main);
  border: 1px solid var(--border-card);
}

.btn-secondary:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-highlight);
  color: #FFFFFF;
}

.btn-sm {
  padding: 9px 16px;
  font-size: 0.88rem;
  border-radius: var(--radius-sm);
}

.btn-lg {
  padding: 16px 28px;
  font-size: 1.05rem;
  border-radius: var(--radius-lg);
}

.btn-block {
  width: 100%;
}

/* 6. Hero Section */
.hero-section {
  padding-top: 48px;
  padding-bottom: 64px;
  position: relative;
  overflow: hidden;
}

.hero-container {
  display: flex;
  flex-direction: column;
  gap: 48px;
}

.hero-copy {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.hero-pill-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: var(--radius-full);
  background: rgba(56, 189, 248, 0.12);
  border: 1px solid rgba(56, 189, 248, 0.3);
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--sky-blue);
  margin-bottom: 20px;
}

.pulse-indicator {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--sky-blue);
  box-shadow: 0 0 10px var(--sky-blue);
  animation: pulse-glow 2s infinite;
}

@keyframes pulse-glow {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(56, 189, 248, 0.7); }
  70% { transform: scale(1); box-shadow: 0 0 0 8px rgba(56, 189, 248, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(56, 189, 248, 0); }
}

.hero-title {
  font-family: var(--font-display);
  font-size: 2.3rem;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  color: var(--text-main);
  margin-bottom: 18px;
}

.hero-description {
  font-size: 1.05rem;
  line-height: 1.65;
  color: var(--text-sub);
  margin-bottom: 32px;
  max-width: 580px;
}

.hero-actions {
  display: flex;
  flex-direction: column;
  gap: 14px;
  width: 100%;
  margin-bottom: 28px;
}

.hero-meta {
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-size: 0.88rem;
  color: var(--text-sub);
  margin-bottom: 24px;
}

.meta-item {
  display: flex;
  align-items: center;
  gap: 8px;
}

/* Desktop QR Code Card */
.desktop-qr-card {
  display: none;
  align-items: center;
  gap: 16px;
  padding: 14px 18px;
  border-radius: var(--radius-md);
  background: var(--bg-surface);
  border: 1px solid var(--border-card);
  max-width: 440px;
}

.qr-code-box {
  width: 88px;
  height: 88px;
  background: #FFFFFF;
  border-radius: var(--radius-sm);
  padding: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.qr-details {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.qr-title {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--text-main);
}

.qr-sub {
  font-size: 0.78rem;
  color: var(--text-muted);
  line-height: 1.4;
}

/* 7. Hero Visual & Smartphone Mockup */
.hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 100%;
  position: relative;
}

.phone-mockup-wrapper {
  position: relative;
  width: 100%;
  max-width: 320px;
  margin: 0 auto;
}

.glow-orb {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 320px;
  height: 480px;
  background: radial-gradient(circle, rgba(99, 91, 255, 0.25) 0%, rgba(56, 189, 248, 0.15) 50%, transparent 75%);
  filter: blur(40px);
  z-index: 1;
  pointer-events: none;
}

.smartphone-frame {
  position: relative;
  z-index: 2;
  background: #0B0D17;
  border: 10px solid #1E2338;
  border-radius: 44px;
  box-shadow: 0 25px 60px rgba(0, 0, 0, 0.8), 0 0 0 1px rgba(255, 255, 255, 0.08);
  overflow: hidden;
  padding-bottom: 12px;
}

.phone-speaker {
  width: 60px;
  height: 5px;
  background: #2D3748;
  border-radius: 10px;
  position: absolute;
  top: 14px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 10;
}

.phone-camera {
  width: 11px;
  height: 11px;
  background: #1A202C;
  border: 1px solid #2D3748;
  border-radius: 50%;
  position: absolute;
  top: 11px;
  left: calc(50% + 46px);
  z-index: 10;
}

.phone-screen {
  background: #0B0D17;
  padding: 34px 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.screen-status-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--text-sub);
  padding: 0 4px 6px;
}

.status-icons {
  display: flex;
  gap: 6px;
}

.screen-app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 4px 0 8px;
}

.app-header-left {
  display: flex;
  align-items: center;
  gap: 10px;
}

.screen-logo {
  width: 36px;
  height: 36px;
  background: #111524;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border-card);
}

.screen-app-title {
  font-size: 0.98rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  gap: 6px;
}

.badge-pro {
  font-size: 0.65rem;
  font-weight: 800;
  padding: 2px 6px;
  border-radius: 4px;
  background: rgba(56, 189, 248, 0.18);
  color: var(--sky-blue);
  border: 1px solid rgba(56, 189, 248, 0.35);
}

.screen-app-sub {
  font-size: 0.7rem;
  color: var(--text-muted);
}

.screen-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
  padding: 12px;
}

.master-card {
  border-color: rgba(99, 91, 255, 0.35);
  box-shadow: 0 4px 16px rgba(99, 91, 255, 0.15);
}

.card-split {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
}

.card-title {
  font-size: 0.88rem;
  font-weight: 700;
}

.card-caption {
  font-size: 0.72rem;
  color: var(--text-sub);
}

.switch-ui {
  width: 44px;
  height: 24px;
  background: #2D3748;
  border-radius: 12px;
  position: relative;
  transition: background 0.2s;
  flex-shrink: 0;
}

.switch-ui.active {
  background: var(--primary);
}

.switch-knob {
  width: 18px;
  height: 18px;
  background: #FFFFFF;
  border-radius: 50%;
  position: absolute;
  top: 3px;
  left: 3px;
  transition: transform 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 10px;
  font-weight: 800;
  color: var(--primary);
}

.switch-ui.active .switch-knob {
  transform: translateX(20px);
}

.active-status-pill {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  background: rgba(56, 189, 248, 0.1);
  color: var(--sky-blue);
  font-size: 0.72rem;
  font-weight: 700;
}

.active-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--sky-blue);
  box-shadow: 0 0 6px var(--sky-blue);
}

.info-card .card-row {
  display: flex;
  align-items: center;
  gap: 10px;
}

.icon-circle {
  width: 30px;
  height: 30px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  flex-shrink: 0;
}

.icon-green { background: rgba(16, 185, 129, 0.15); color: var(--emerald); }
.icon-blue { background: rgba(56, 189, 248, 0.15); color: var(--sky-blue); }

.row-title {
  font-size: 0.8rem;
  font-weight: 700;
}

.row-status {
  font-size: 0.7rem;
}

.text-green { color: var(--emerald); font-weight: 600; }
.text-blue { color: var(--sky-blue); font-weight: 600; }

/* Quick Actions Tile Row */
.screen-quick-actions {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 6px;
}

.action-tile {
  background: var(--bg-surface);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-sm);
  padding: 8px 4px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

.tile-icon {
  font-size: 0.95rem;
}

.tile-label {
  font-size: 0.65rem;
  font-weight: 600;
  color: var(--text-sub);
}

/* Floating Badges */
.floating-badge {
  position: absolute;
  z-index: 5;
  background: rgba(17, 21, 36, 0.88);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border-highlight);
  border-radius: var(--radius-md);
  padding: 10px 14px;
  box-shadow: var(--shadow-md);
  display: none;
  align-items: center;
  gap: 10px;
}

.floating-badge strong {
  display: block;
  font-size: 0.82rem;
  color: var(--text-main);
}

.floating-badge small {
  display: block;
  font-size: 0.72rem;
  color: var(--text-sub);
}

.badge-top-right {
  top: 40px;
  right: -30px;
}

.badge-bottom-left {
  bottom: 60px;
  left: -30px;
  max-width: 240px;
}

.badge-emoji {
  font-size: 1.3rem;
}

/* 8. Features Section */
.features-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 26px;
  transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--border-highlight), transparent);
  opacity: 0;
  transition: opacity 0.3s;
}

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

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

.feature-icon-box {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  background: rgba(99, 91, 255, 0.1);
  border: 1px solid rgba(99, 91, 255, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}

.feature-title {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text-main);
}

.feature-desc {
  font-size: 0.95rem;
  color: var(--text-sub);
  line-height: 1.6;
  margin-bottom: 18px;
  flex-grow: 1;
}

.feature-benefit {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--sky-blue);
  padding-top: 14px;
  border-top: 1px solid var(--border-subtle);
}

/* 9. How It Works Section */
.steps-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  position: relative;
}

.step-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  position: relative;
  transition: transform 0.25s ease, border-color 0.25s ease;
}

.step-card:hover {
  border-color: var(--primary);
  transform: translateY(-3px);
}

.step-badge {
  position: absolute;
  top: 20px;
  right: 20px;
  font-size: 0.75rem;
  font-weight: 800;
  color: var(--primary-light);
  background: rgba(99, 91, 255, 0.15);
  padding: 4px 10px;
  border-radius: var(--radius-full);
}

.step-icon-wrap {
  width: 54px;
  height: 54px;
  border-radius: var(--radius-md);
  background: rgba(56, 189, 248, 0.1);
  border: 1px solid rgba(56, 189, 248, 0.25);
  color: var(--sky-blue);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}

.step-title {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text-main);
}

.step-desc {
  font-size: 0.92rem;
  color: var(--text-sub);
  line-height: 1.55;
}

/* 10. App Preview Section */
.preview-tabs {
  display: inline-flex;
  gap: 6px;
  background: var(--bg-surface);
  border: 1px solid var(--border-card);
  padding: 6px;
  border-radius: var(--radius-full);
  margin-top: 20px;
  max-width: 100%;
  overflow-x: auto;
}

.tab-btn {
  padding: 8px 18px;
  border-radius: var(--radius-full);
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-sub);
  white-space: nowrap;
  transition: all 0.2s ease;
}

.tab-btn:hover {
  color: var(--text-main);
}

.tab-btn.active {
  background: var(--primary);
  color: #FFFFFF;
  box-shadow: 0 2px 10px var(--primary-glow);
}

.preview-content {
  display: none;
  margin-top: 36px;
}

.preview-content.active {
  display: block;
  animation: fadeIn 0.35s ease-in-out;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.preview-showcase {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-xl);
  padding: 32px 24px;
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.screen-tag {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--sky-blue);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 6px;
}

.preview-heading {
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 800;
  margin-bottom: 12px;
  color: var(--text-main);
}

.preview-paragraph {
  font-size: 0.96rem;
  color: var(--text-sub);
  line-height: 1.6;
  margin-bottom: 20px;
}

.preview-points {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.preview-points li {
  position: relative;
  padding-left: 24px;
  font-size: 0.92rem;
  color: var(--text-sub);
  line-height: 1.5;
}

.preview-points li::before {
  content: '✓';
  position: absolute;
  left: 0;
  top: 0;
  color: var(--emerald);
  font-weight: 800;
}

.preview-device {
  display: flex;
  justify-content: center;
}

.preview-frame {
  width: 100%;
  max-width: 300px;
  background: var(--bg-surface);
  border: 1px solid var(--border-highlight);
  border-radius: var(--radius-lg);
  padding: 16px;
  box-shadow: var(--shadow-lg);
}

.preview-card-mockup {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.mockup-header-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-subtle);
}

.mockup-brand {
  font-size: 0.9rem;
  font-weight: 700;
}

.mockup-pill {
  font-size: 0.7rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.08);
}

.text-sky { color: var(--sky-blue); }
.text-cyan { color: var(--cyan); }

.mockup-toggle-box {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  padding: 12px;
  border-radius: var(--radius-md);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.mockup-toggle-box strong {
  display: block;
  font-size: 0.85rem;
}

.mockup-toggle-box p {
  font-size: 0.7rem;
  color: var(--text-muted);
}

.mini-switch {
  width: 36px;
  height: 20px;
  background: var(--primary);
  border-radius: 10px;
  position: relative;
}

.mini-switch::after {
  content: '';
  position: absolute;
  top: 2px;
  right: 2px;
  width: 16px;
  height: 16px;
  background: white;
  border-radius: 50%;
}

.mockup-tile-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 6px;
}

.mini-tile {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  padding: 8px 4px;
  border-radius: var(--radius-sm);
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.mockup-step-item {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--bg-card);
  padding: 10px 12px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-card);
}

.step-num {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--primary);
  color: white;
  font-size: 0.75rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.mockup-step-item strong {
  display: block;
  font-size: 0.82rem;
}

.mockup-step-item small {
  font-size: 0.68rem;
  color: var(--text-muted);
}

.mockup-plan-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  padding: 12px;
  border-radius: var(--radius-md);
}

.mockup-plan-card.selected {
  border-color: var(--sky-blue);
  background: rgba(56, 189, 248, 0.08);
}

.plan-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
}

.plan-price {
  color: var(--sky-blue);
  font-weight: 700;
}

.mockup-autopay-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8rem;
  padding: 6px 4px;
}

/* 11. Installation Guide Section */
.guide-wrapper {
  max-width: 780px;
  margin: 0 auto;
}

.guide-steps {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-bottom: 28px;
}

.guide-step-item {
  display: flex;
  gap: 18px;
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 20px;
  transition: border-color 0.2s ease;
}

.guide-step-item:hover {
  border-color: var(--border-highlight);
}

.guide-step-number {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, #635BFF, #38BDF8);
  color: #FFFFFF;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.guide-step-body {
  flex: 1;
}

.guide-step-title {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 6px;
  color: var(--text-main);
}

.guide-step-text {
  font-size: 0.92rem;
  color: var(--text-sub);
  line-height: 1.55;
}

.alert-box {
  display: flex;
  gap: 14px;
  padding: 16px 20px;
  border-radius: var(--radius-md);
  margin-bottom: 28px;
  font-size: 0.9rem;
  line-height: 1.55;
}

.alert-info {
  background: rgba(56, 189, 248, 0.08);
  border: 1px solid rgba(56, 189, 248, 0.25);
  color: var(--text-sub);
}

.alert-info strong {
  display: block;
  color: var(--sky-blue);
  margin-bottom: 4px;
}

.alert-warning {
  background: rgba(245, 158, 11, 0.1);
  border: 1px solid rgba(245, 158, 11, 0.3);
  color: var(--amber);
}

.guide-cta-card {
  background: linear-gradient(135deg, #161A2D, #1C223A);
  border: 1px solid var(--border-highlight);
  border-radius: var(--radius-xl);
  padding: 32px 24px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
  box-shadow: var(--shadow-lg);
}

.cta-card-content h3 {
  font-family: var(--font-display);
  font-size: 1.45rem;
  font-weight: 800;
  margin-bottom: 6px;
}

.cta-card-content p {
  color: var(--text-sub);
  font-size: 0.95rem;
}

/* 12. FAQ Section */
.accordion {
  max-width: 780px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.accordion-item {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color 0.2s ease, background 0.2s ease;
}

.accordion-item:hover {
  border-color: var(--border-highlight);
}

.accordion-header {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 22px;
  text-align: left;
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--text-main);
  cursor: pointer;
  background: transparent;
}

.accordion-header:hover {
  color: var(--sky-blue);
}

.accordion-arrow {
  font-size: 1.4rem;
  font-weight: 400;
  color: var(--text-muted);
  transition: transform 0.3s ease, color 0.3s ease;
  line-height: 1;
}

.accordion-item.open {
  border-color: var(--primary);
  background: var(--bg-card-hover);
}

.accordion-item.open .accordion-arrow {
  transform: rotate(45deg);
  color: var(--sky-blue);
}

.accordion-body {
  padding: 0 22px 20px;
  font-size: 0.95rem;
  color: var(--text-sub);
  line-height: 1.6;
}

/* 13. About & Founder Section */
.about-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-xl);
  padding: 36px 24px;
  max-width: 820px;
  margin: 0 auto;
  position: relative;
  overflow: hidden;
}

.about-card::after {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 250px;
  height: 250px;
  background: radial-gradient(circle, rgba(99, 91, 255, 0.12), transparent 70%);
  pointer-events: none;
}

.about-title {
  font-family: var(--font-display);
  font-size: 1.75rem;
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 14px;
}

.about-desc {
  font-size: 1.02rem;
  color: var(--text-sub);
  line-height: 1.65;
  margin-bottom: 32px;
}

.founder-profile {
  display: flex;
  flex-direction: column;
  gap: 18px;
  padding: 22px;
  border-radius: var(--radius-lg);
  background: var(--bg-surface);
  border: 1px solid var(--border-card);
}

.founder-avatar {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: linear-gradient(135deg, #635BFF, #38BDF8);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.3rem;
  color: #FFFFFF;
  box-shadow: 0 4px 14px var(--primary-glow);
  flex-shrink: 0;
}

.founder-name {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-main);
}

.founder-role {
  display: block;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--sky-blue);
  margin-bottom: 10px;
}

.founder-bio {
  font-size: 0.92rem;
  color: var(--text-sub);
  line-height: 1.6;
}

/* 14. Footer */
.app-footer {
  background: #040509;
  border-top: 1px solid var(--border-subtle);
  padding: 56px 0 32px;
  font-size: 0.92rem;
  color: var(--text-sub);
}

.footer-container {
  display: flex;
  flex-direction: column;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-brand-col {
  display: flex;
  flex-direction: column;
  gap: 16px;
  max-width: 360px;
}

.footer-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.6;
}

.footer-apk-badge {
  display: inline-block;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  font-size: 0.78rem;
  color: var(--sky-blue);
  font-weight: 600;
}

.footer-col-title {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 16px;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-links a, .footer-link-btn {
  color: var(--text-sub);
  font-size: 0.9rem;
  text-align: left;
  transition: color 0.2s;
}

.footer-links a:hover, .footer-link-btn:hover {
  color: var(--sky-blue);
}

.footer-link.highlight {
  color: var(--primary-light);
  font-weight: 700;
}

.footer-bottom {
  padding-top: 28px;
  border-top: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.disclaimer-text {
  font-size: 0.78rem;
  color: var(--text-muted);
  line-height: 1.55;
}

.copyright-row {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* 15. Floating Download Toast Notification */
.download-toast {
  position: fixed;
  bottom: 24px;
  right: 20px;
  left: 20px;
  z-index: 2000;
  background: rgba(19, 23, 40, 0.95);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-highlight);
  border-radius: var(--radius-lg);
  padding: 14px 18px;
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: 14px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: opacity 0.3s ease, transform 0.3s ease, visibility 0.3s;
}

.download-toast.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.toast-icon {
  font-size: 1.4rem;
  flex-shrink: 0;
}

.toast-body {
  flex: 1;
  font-size: 0.85rem;
}

.toast-body strong {
  display: block;
  color: var(--text-main);
}

.toast-body span {
  color: var(--text-sub);
  font-size: 0.78rem;
}

.toast-action {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--sky-blue);
  white-space: nowrap;
}

.toast-action:hover {
  text-decoration: underline;
}

.toast-close {
  color: var(--text-muted);
  font-size: 1.4rem;
  padding: 2px 6px;
  line-height: 1;
  cursor: pointer;
}

/* 16. Modals (Privacy & Terms) */
.modal-backdrop {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  z-index: 3000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.25s ease, visibility 0.25s ease;
}

.modal-backdrop.open {
  opacity: 1;
  visibility: visible;
}

.modal-dialog {
  background: var(--bg-surface);
  border: 1px solid var(--border-highlight);
  border-radius: var(--radius-xl);
  width: 100%;
  max-width: 600px;
  max-height: 85vh;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-lg);
  transform: scale(0.95);
  transition: transform 0.25s ease;
}

.modal-backdrop.open .modal-dialog {
  transform: scale(1);
}

.modal-header {
  padding: 20px 24px;
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.modal-header h3 {
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 700;
}

.modal-close-btn {
  font-size: 1.6rem;
  color: var(--text-muted);
  cursor: pointer;
}

.modal-close-btn:hover {
  color: var(--text-main);
}

.modal-body {
  padding: 24px;
  overflow-y: auto;
  font-size: 0.92rem;
  color: var(--text-sub);
  line-height: 1.65;
}

.modal-body h4 {
  font-size: 1.05rem;
  color: var(--text-main);
  margin: 18px 0 6px;
}

.modal-body p {
  margin-bottom: 12px;
}

.modal-footer {
  padding: 16px 24px;
  border-top: 1px solid var(--border-subtle);
  display: flex;
  justify-content: flex-end;
}

/* Mobile Viewport Optimizations (Under 480px) */
@media (max-width: 479px) {
  html, body {
    overflow-x: hidden;
  }

  .container {
    padding-left: 16px;
    padding-right: 16px;
  }

  .announcement-bar {
    padding: 6px 12px;
  }

  .announcement-content {
    gap: 6px;
    font-size: 0.74rem;
    line-height: 1.35;
  }

  .badge-android {
    padding: 2px 7px;
    font-size: 0.68rem;
  }

  .navbar {
    height: 64px;
  }

  .brand-name {
    font-size: 1.2rem;
  }

  .nav-actions .btn-sm {
    padding: 8px 12px;
    font-size: 0.8rem;
  }

  .nav-actions .btn-sm span {
    display: none;
  }

  .nav-actions .btn-sm::after {
    content: 'APK';
    display: inline;
  }

  .hero-section {
    padding-top: 28px;
    padding-bottom: 44px;
  }

  .hero-title {
    font-size: clamp(1.8rem, 7.5vw, 2.2rem);
    letter-spacing: -0.02em;
    line-height: 1.2;
  }

  .hero-description {
    font-size: 0.95rem;
    line-height: 1.55;
    margin-bottom: 24px;
  }

  .hero-actions {
    width: 100%;
  }

  .hero-actions .btn {
    width: 100%;
    min-height: 48px;
    font-size: 0.98rem;
  }

  .hero-meta {
    font-size: 0.82rem;
    gap: 8px;
  }

  .phone-mockup-wrapper {
    max-width: min(320px, calc(100vw - 32px));
    width: 100%;
  }

  .smartphone-frame {
    border-width: 8px;
    border-radius: 36px;
  }

  .phone-screen {
    padding: 28px 10px 14px;
    gap: 10px;
  }

  .screen-card {
    padding: 10px;
  }

  .screen-quick-actions {
    gap: 4px;
  }

  .action-tile {
    padding: 6px 2px;
  }

  .tile-icon {
    font-size: 0.85rem;
  }

  .tile-label {
    font-size: 0.6rem;
  }

  .section {
    padding-top: 48px;
    padding-bottom: 48px;
  }

  .section-title {
    font-size: 1.75rem;
  }

  .section-subtitle {
    font-size: 0.92rem;
  }

  /* App Preview Horizontal Tabs on Mobile */
  .preview-tabs {
    display: flex;
    width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    border-radius: var(--radius-lg);
    padding: 4px;
    gap: 4px;
    box-sizing: border-box;
  }

  .preview-tabs::-webkit-scrollbar {
    display: none;
  }

  .tab-btn {
    flex: 1 0 auto;
    padding: 8px 12px;
    font-size: 0.82rem;
    text-align: center;
    white-space: nowrap;
  }

  .preview-showcase {
    padding: 20px 16px;
    border-radius: var(--radius-lg);
    gap: 20px;
  }

  .preview-heading {
    font-size: 1.35rem;
  }

  .preview-frame {
    max-width: 100%;
    padding: 12px;
  }

  .guide-step-item {
    gap: 12px;
    padding: 16px;
  }

  .guide-step-number {
    width: 32px;
    height: 32px;
    font-size: 0.9rem;
    flex-shrink: 0;
  }

  .guide-cta-card {
    flex-direction: column;
    padding: 20px 16px;
    text-align: center;
    gap: 16px;
  }

  .guide-cta-card .btn {
    width: 100%;
    min-height: 48px;
  }

  .download-toast {
    left: 16px;
    right: 16px;
    bottom: max(16px, env(safe-area-inset-bottom));
    padding: 12px 14px;
    gap: 10px;
    z-index: 3000;
  }

  .toast-body {
    font-size: 0.8rem;
  }

  .modal-dialog {
    margin: 16px;
    max-height: 90vh;
  }
}

/* Ultra-Compact Screens (Under 360px) */
@media (max-width: 359px) {
  .hero-title {
    font-size: 1.6rem;
  }

  .smartphone-frame {
    border-width: 6px;
    border-radius: 28px;
  }

  .card-title {
    font-size: 0.8rem;
  }

  .card-caption {
    font-size: 0.65rem;
  }

  .btn {
    padding: 10px 16px;
    font-size: 0.88rem;
  }
}

/* 480px+: Large Phones */
@media (min-width: 480px) {
  .hero-actions {
    flex-direction: row;
    align-items: center;
  }
  
  .hero-meta {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 16px;
  }
  
  .phone-mockup-wrapper {
    max-width: 340px;
  }

  .download-toast {
    left: auto;
    max-width: 420px;
  }
}

/* 768px+: Tablets & Small Laptops */
@media (min-width: 768px) {
  .section {
    padding-top: 84px;
    padding-bottom: 84px;
  }

  .section-title {
    font-size: 2.5rem;
  }

  .hero-title {
    font-size: 3.2rem;
  }

  .hero-container {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    gap: 40px;
  }

  .hero-copy {
    flex: 1.1;
  }

  .hero-visual {
    flex: 0.9;
  }

  .phone-mockup-wrapper {
    max-width: 340px;
  }

  .floating-badge {
    display: flex;
  }

  .features-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
  }

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

  .preview-showcase {
    flex-direction: row;
    align-items: center;
    padding: 44px;
  }

  .preview-text {
    flex: 1.1;
  }

  .preview-device {
    flex: 0.9;
  }

  .founder-profile {
    flex-direction: row;
    align-items: flex-start;
  }

  .footer-container {
    flex-direction: row;
    justify-content: space-between;
  }

  .copyright-row {
    flex-direction: row;
    justify-content: space-between;
  }
}

/* 1024px+: Laptops & Desktop Monitors */
@media (min-width: 1024px) {
  .nav-links {
    display: flex;
  }

  .hamburger-btn {
    display: none;
  }

  .hero-section {
    padding-top: 80px;
    padding-bottom: 96px;
  }

  .hero-title {
    font-size: 3.75rem;
  }

  .desktop-qr-card {
    display: flex;
  }

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

  .about-card {
    padding: 56px 48px;
  }
}

/* 1440px+: Ultra-wide Monitors */
@media (min-width: 1440px) {
  :root {
    --container-max: 1320px;
  }

  .hero-title {
    font-size: 4.1rem;
  }
}

/* High-contrast and Reduced Motion Accessibility */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}