/* ==========================================================================
   CalculatorTip Official Website - Main Stylesheet
   Brand: CalculatorTip (SoulFabrica LLC)
   Domain: https://calculatortip.com
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Design Tokens & Variables
   -------------------------------------------------------------------------- */
:root {
  /* Brand Palette (Figma-aligned) */
  --color-brand: #6D4AFF;
  --color-brand-hover: #5B3CE6;
  --color-brand-active: #4A30C4;
  --color-brand-subtle: #F3F0FF;
  --color-brand-subtle-text: #4A30C4;
  --color-brand-light: #EDE8FF;

  /* Semantic Neutrals */
  --color-canvas: #F6F6FB;
  --color-surface: #FFFFFF;
  --color-surface-raised: #FFFFFF;
  --color-surface-subtle: #F0F0F7;
  --color-text-primary: #14143A;
  --color-text-secondary: #55557F;
  --color-text-muted: #616184;
  --color-border-default: #E8E8F2;
  --color-border-strong: #CFCFE0;

  /* Category Tones */
  --tone-tip-bg: #E7E0FF;
  --tone-tip-fg: #4A30C4;
  --tone-split-bg: #ECFDF3;
  --tone-split-fg: #15803D;
  --tone-hourly-bg: #DBEAFE;
  --tone-hourly-fg: #2563EB;
  --tone-shift-bg: #FFFBEB;
  --tone-shift-fg: #B45309;
  --tone-overtime-bg: #FEF2F2;
  --tone-overtime-fg: #DC2626;
  --tone-weekly-bg: #F0FDFA;
  --tone-weekly-fg: #0F766E;
  --tone-business-bg: #F5F3FF;
  --tone-business-fg: #6D4AFF;

  /* Typography */
  --font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-size-xs: 0.75rem;    /* 12px */
  --font-size-sm: 0.875rem;   /* 14px */
  --font-size-base: 1rem;     /* 16px */
  --font-size-md: 1.125rem;   /* 18px */
  --font-size-lg: 1.25rem;    /* 20px */
  --font-size-xl: 1.5rem;     /* 24px */
  --font-size-2xl: 1.875rem;  /* 30px */
  --font-size-3xl: 2.25rem;   /* 36px */
  --font-size-4xl: 3rem;      /* 48px */

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(20, 20, 58, 0.05);
  --shadow-md: 0 4px 16px rgba(20, 20, 58, 0.07);
  --shadow-lg: 0 12px 36px rgba(20, 20, 58, 0.09);
  --shadow-brand: 0 10px 28px rgba(109, 74, 255, 0.28);

  /* Borders & Radii */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-full: 9999px;

  /* Layout */
  --container-max: 1200px;
  --container-narrow: 860px;
  --header-height: 76px;
  --transition-fast: 160ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 240ms cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  font-family: var(--font-family);
  font-size: 16px;
  color: var(--color-text-primary);
  background-color: var(--color-canvas);
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  line-height: 1.6;
  color: var(--color-text-secondary);
}

main {
  flex: 1;
}

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

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

a:hover {
  color: var(--color-brand-hover);
}

a:focus-visible, button:focus-visible, summary:focus-visible, input:focus-visible {
  outline: 2px solid var(--color-brand);
  outline-offset: 3px;
}

h1, h2, h3, h4, h5, h6 {
  color: var(--color-text-primary);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.02em;
}

p {
  margin-bottom: 1rem;
}

p:last-child {
  margin-bottom: 0;
}

ul, ol {
  padding-left: 1.5rem;
  margin-bottom: 1rem;
}

/* Skip link for accessibility */
.skip-link {
  position: absolute;
  top: -100px;
  left: 20px;
  background: var(--color-brand);
  color: #FFFFFF;
  padding: 12px 20px;
  font-weight: 600;
  border-radius: var(--radius-md);
  z-index: 1000;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 16px;
}

/* --------------------------------------------------------------------------
   3. Container & Layout Helpers
   -------------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

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

.section {
  padding: 96px 0;
}

.section--sm {
  padding: 64px 0;
}

.section--canvas {
  background-color: var(--color-canvas);
}

.section--surface {
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-border-default);
  border-bottom: 1px solid var(--color-border-default);
}

.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 56px auto;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: var(--font-size-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-brand-subtle-text);
  background-color: var(--color-brand-subtle);
  padding: 6px 14px;
  border-radius: var(--radius-full);
  margin-bottom: 16px;
}

.section-title {
  font-size: var(--font-size-3xl);
  margin-bottom: 16px;
}

.section-subtitle {
  font-size: var(--font-size-md);
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* --------------------------------------------------------------------------
   4. Navigation Header
   -------------------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  width: 100%;
  height: var(--header-height);
  background-color: rgba(246, 246, 251, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border-default);
  z-index: 50;
  transition: background-color var(--transition-fast), box-shadow var(--transition-fast);
}

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

.site-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text-primary);
  text-decoration: none;
}

.site-logo img {
  height: 38px;
  width: auto;
}

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

.nav-link {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
  padding: 8px 0;
  position: relative;
}

.nav-link:hover, .nav-link.active {
  color: var(--color-brand);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--color-brand);
  border-radius: 2px;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

/* Mobile Menu Toggle */
.menu-toggle {
  display: none;
  background: none;
  border: 1px solid var(--color-border-default);
  border-radius: var(--radius-md);
  padding: 8px;
  cursor: pointer;
  color: var(--color-text-primary);
  line-height: 0;
}

.menu-toggle svg {
  width: 24px;
  height: 24px;
}

/* --------------------------------------------------------------------------
   5. Buttons & Badges
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  font-size: var(--font-size-sm);
  font-weight: 600;
  padding: 12px 24px;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.btn--primary {
  background-color: var(--color-brand);
  color: #FFFFFF;
  box-shadow: var(--shadow-brand);
}

.btn--primary:hover {
  background-color: var(--color-brand-hover);
  color: #FFFFFF;
  transform: translateY(-1px);
}

.btn--primary:active {
  background-color: var(--color-brand-active);
  transform: translateY(0);
}

.btn--secondary {
  background-color: var(--color-surface);
  color: var(--color-text-primary);
  border-color: var(--color-border-default);
  box-shadow: var(--shadow-sm);
}

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

.btn--sm {
  padding: 8px 16px;
  font-size: var(--font-size-xs);
}

.btn--lg {
  padding: 16px 32px;
  font-size: var(--font-size-base);
}

/* Google Play Store Badge Button */
.btn-playstore {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  background-color: var(--color-text-primary);
  color: #FFFFFF;
  padding: 12px 24px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-fast);
  border: 1px solid rgba(255, 255, 255, 0.12);
  text-decoration: none;
  text-align: left;
}

.btn-playstore:hover {
  background-color: #0E0E28;
  color: #FFFFFF;
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn-playstore svg {
  width: 28px;
  height: 28px;
  flex-shrink: 0;
}

.btn-playstore-text {
  display: flex;
  flex-direction: column;
}

.btn-playstore-label {
  font-size: 11px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  opacity: 0.8;
  line-height: 1.2;
}

.btn-playstore-title {
  font-size: 16px;
  font-weight: 700;
  line-height: 1.2;
  color: #FFFFFF;
}

.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background-color: rgba(109, 74, 255, 0.1);
  color: var(--color-brand);
  padding: 4px 10px;
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: 600;
}

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

@keyframes pulseDot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.85); }
}

/* --------------------------------------------------------------------------
   6. Hero Section
   -------------------------------------------------------------------------- */
.hero {
  padding: 72px 0 96px 0;
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 56px;
  align-items: center;
}

.hero-content {
  max-width: 640px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border-default);
  padding: 6px 14px;
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: 600;
  color: var(--color-text-secondary);
  box-shadow: var(--shadow-sm);
  margin-bottom: 24px;
}

.hero-title {
  font-size: var(--font-size-4xl);
  line-height: 1.15;
  margin-bottom: 20px;
  color: var(--color-text-primary);
}

.hero-title span {
  color: var(--color-brand);
}

.hero-lead {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: 32px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
  margin-bottom: 40px;
}

.hero-highlights {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  padding-top: 24px;
  border-top: 1px solid var(--color-border-default);
}

.highlight-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: var(--font-size-xs);
  font-weight: 600;
  color: var(--color-text-secondary);
}

.highlight-item svg {
  width: 16px;
  height: 16px;
  color: #15803D; /* Success green */
  flex-shrink: 0;
}

/* --------------------------------------------------------------------------
   7. Device Mockup Component (Mobile Placeholder)
   -------------------------------------------------------------------------- */
.hero-visual {
  display: flex;
  justify-content: center;
  position: relative;
}

.phone-mockup {
  width: 320px;
  height: 640px;
  background: #0E0E1A;
  border-radius: 44px;
  padding: 12px;
  box-shadow: 0 25px 60px -12px rgba(20, 20, 58, 0.25), 0 0 0 1px rgba(20, 20, 58, 0.08);
  position: relative;
}

.phone-mockup::before {
  content: '';
  position: absolute;
  top: 22px;
  left: 50%;
  transform: translateX(-50%);
  width: 90px;
  height: 18px;
  background-color: #0E0E1A;
  border-radius: 12px;
  z-index: 10;
}

.phone-screen {
  width: 100%;
  height: 100%;
  background-color: var(--color-canvas);
  border-radius: 34px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  position: relative;
}

.app-screen-header {
  padding: 36px 16px 12px 16px;
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border-default);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.app-screen-brand {
  font-size: var(--font-size-sm);
  font-weight: 700;
  color: var(--color-text-primary);
}

.app-screen-brand span {
  color: var(--color-brand);
}

.app-screen-body {
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  flex: 1;
  overflow: hidden;
}

.mockup-hero-card {
  background: var(--color-brand);
  color: #FFFFFF;
  border-radius: var(--radius-md);
  padding: 16px;
  box-shadow: var(--shadow-sm);
}

.mockup-hero-label {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.05em;
  opacity: 0.8;
  text-transform: uppercase;
}

.mockup-hero-value {
  font-size: 24px;
  font-weight: 700;
  margin: 4px 0 2px 0;
}

.mockup-hero-sub {
  font-size: 11px;
  opacity: 0.85;
}

.mockup-calc-card {
  background: var(--color-surface);
  border-radius: var(--radius-md);
  padding: 12px 14px;
  border: 1px solid var(--color-border-default);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.mockup-calc-info {
  display: flex;
  align-items: center;
  gap: 10px;
}

.mockup-calc-icon {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 700;
}

.mockup-calc-title {
  font-size: 12px;
  font-weight: 600;
  color: var(--color-text-primary);
}

.mockup-calc-desc {
  font-size: 10px;
  color: var(--color-text-muted);
}

.mockup-calc-val {
  font-size: 13px;
  font-weight: 700;
  color: var(--color-brand);
}

/* --------------------------------------------------------------------------
   8. Feature Cards & Grids
   -------------------------------------------------------------------------- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(270px, 1fr));
  gap: 24px;
}

.feature-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border-default);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast);
  display: flex;
  flex-direction: column;
}

.feature-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-border-strong);
}

.feature-icon-box {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  flex-shrink: 0;
}

.feature-icon-box svg {
  width: 24px;
  height: 24px;
}

.feature-title {
  font-size: var(--font-size-md);
  margin-bottom: 10px;
}

.feature-desc {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1.55;
  margin-bottom: 16px;
  flex: 1;
}

.feature-bullets {
  list-style: none;
  padding: 0;
  margin: 0;
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.feature-bullets li {
  display: flex;
  align-items: center;
  gap: 6px;
}

.feature-bullets li::before {
  content: '•';
  color: var(--color-brand);
  font-weight: bold;
}

/* --------------------------------------------------------------------------
   9. Value Pillars ("Why CalculatorTip?")
   -------------------------------------------------------------------------- */
.pillars-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 28px;
}

.pillar-item {
  background: var(--color-surface);
  border: 1px solid var(--color-border-default);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  text-align: center;
  box-shadow: var(--shadow-sm);
}

.pillar-icon {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--color-brand-subtle);
  color: var(--color-brand);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px auto;
}

.pillar-icon svg {
  width: 28px;
  height: 28px;
}

.pillar-title {
  font-size: var(--font-size-md);
  margin-bottom: 10px;
}

.pillar-desc {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1.55;
}

/* --------------------------------------------------------------------------
   10. How It Works Steps
   -------------------------------------------------------------------------- */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  position: relative;
}

.step-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border-default);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  box-shadow: var(--shadow-sm);
  position: relative;
}

.step-num {
  font-size: var(--font-size-xs);
  font-weight: 700;
  color: var(--color-brand);
  background: var(--color-brand-subtle);
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}

.step-title {
  font-size: var(--font-size-lg);
  margin-bottom: 12px;
}

.step-desc {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

/* --------------------------------------------------------------------------
   11. FAQ Accordion
   -------------------------------------------------------------------------- */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: var(--color-surface);
  border: 1px solid var(--color-border-default);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.faq-item[open] {
  border-color: var(--color-border-strong);
  box-shadow: var(--shadow-sm);
}

.faq-question {
  padding: 20px 24px;
  font-size: var(--font-size-base);
  font-weight: 600;
  color: var(--color-text-primary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  list-style: none;
  user-select: none;
}

.faq-question::-webkit-details-marker {
  display: none;
}

.faq-chevron {
  width: 20px;
  height: 20px;
  color: var(--color-text-muted);
  transition: transform var(--transition-fast);
  flex-shrink: 0;
}

.faq-item[open] .faq-chevron {
  transform: rotate(180deg);
  color: var(--color-brand);
}

.faq-answer {
  padding: 0 24px 24px 24px;
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* --------------------------------------------------------------------------
   12. Call to Action Banner
   -------------------------------------------------------------------------- */
.cta-banner {
  background: linear-gradient(135deg, #14143A 0%, #201648 100%);
  border-radius: var(--radius-xl);
  padding: 64px 48px;
  color: #FFFFFF;
  text-align: center;
  box-shadow: var(--shadow-lg);
  position: relative;
  overflow: hidden;
}

.cta-banner::before {
  content: '';
  position: absolute;
  top: -50%;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(109, 74, 255, 0.3) 0%, rgba(20, 20, 58, 0) 70%);
  pointer-events: none;
}

.cta-title {
  color: #FFFFFF;
  font-size: var(--font-size-3xl);
  margin-bottom: 16px;
  position: relative;
}

.cta-subtitle {
  color: rgba(255, 255, 255, 0.8);
  font-size: var(--font-size-md);
  max-width: 600px;
  margin: 0 auto 36px auto;
  position: relative;
}

.cta-buttons {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  position: relative;
}

/* --------------------------------------------------------------------------
   13. Content Pages (Privacy, Terms, Support, 404)
   -------------------------------------------------------------------------- */
.page-hero {
  padding: 64px 0 40px 0;
  text-align: center;
  border-bottom: 1px solid var(--color-border-default);
  background-color: var(--color-surface);
}

.page-hero-title {
  font-size: var(--font-size-3xl);
  margin-bottom: 12px;
}

.page-hero-meta {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

.prose {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.prose h2 {
  font-size: var(--font-size-xl);
  margin: 40px 0 16px 0;
  color: var(--color-text-primary);
  border-bottom: 1px solid var(--color-border-default);
  padding-bottom: 8px;
}

.prose h3 {
  font-size: var(--font-size-lg);
  margin: 28px 0 12px 0;
}

.prose p {
  margin-bottom: 1.25rem;
}

.prose ul, .prose ol {
  margin-bottom: 1.5rem;
}

.prose li {
  margin-bottom: 0.5rem;
}

.prose strong {
  color: var(--color-text-primary);
}

.callout-box {
  background-color: var(--color-brand-subtle);
  border-left: 4px solid var(--color-brand);
  padding: 20px 24px;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin: 28px 0;
}

.callout-box p {
  color: var(--color-text-primary);
  font-size: var(--font-size-sm);
  margin: 0;
}

.support-channels {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
  margin-bottom: 48px;
}

.channel-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border-default);
  border-radius: var(--radius-lg);
  padding: 28px;
  text-align: center;
}

.channel-icon {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--color-brand-subtle);
  color: var(--color-brand);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px auto;
}

.channel-title {
  font-size: var(--font-size-md);
  margin-bottom: 8px;
}

.channel-desc {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin-bottom: 16px;
}

/* --------------------------------------------------------------------------
   14. Modal / Dialog (Google Play Status Modal)
   -------------------------------------------------------------------------- */
.modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(20, 20, 58, 0.6);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  z-index: 100;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-normal), visibility var(--transition-normal);
}

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

.modal-card {
  background: var(--color-surface);
  border-radius: var(--radius-xl);
  max-width: 460px;
  width: 100%;
  padding: 36px;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--color-border-default);
  text-align: center;
  position: relative;
  transform: scale(0.95);
  transition: transform var(--transition-normal);
}

.modal-backdrop.active .modal-card {
  transform: scale(1);
}

.modal-close {
  position: absolute;
  top: 18px;
  right: 18px;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--color-text-muted);
  padding: 8px;
  border-radius: var(--radius-sm);
}

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

.modal-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 20px auto;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}

.modal-title {
  font-size: var(--font-size-xl);
  margin-bottom: 12px;
}

.modal-text {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: 24px;
}

/* --------------------------------------------------------------------------
   15. Site Footer
   -------------------------------------------------------------------------- */
.site-footer {
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-border-default);
  padding: 80px 0 40px 0;
  font-size: var(--font-size-sm);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 64px;
}

.footer-brand {
  max-width: 360px;
}

.footer-brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: 16px;
  text-decoration: none;
}

.footer-brand-logo img {
  height: 36px;
  width: auto;
}

.footer-brand-desc {
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: 20px;
}

.footer-company-tag {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

.footer-col-title {
  font-size: var(--font-size-sm);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-primary);
  margin-bottom: 20px;
}

.footer-links {
  list-style: none;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-links a {
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: var(--color-brand);
}

.footer-bottom {
  padding-top: 32px;
  border-top: 1px solid var(--color-border-default);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  color: var(--color-text-muted);
  font-size: var(--font-size-xs);
}

/* --------------------------------------------------------------------------
   16. Responsive Breakpoints
   -------------------------------------------------------------------------- */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 48px;
  }

  .hero-content {
    max-width: 100%;
    margin: 0 auto;
  }

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

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

  .steps-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 36px;
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: 68px;
    --font-size-4xl: 2.25rem;
    --font-size-3xl: 1.875rem;
  }

  .section {
    padding: 64px 0;
  }

  .menu-toggle {
    display: block;
  }

  .nav-links {
    position: fixed;
    top: var(--header-height);
    left: 0;
    width: 100%;
    background-color: var(--color-surface);
    border-bottom: 1px solid var(--color-border-default);
    flex-direction: column;
    align-items: flex-start;
    padding: 24px;
    gap: 16px;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: all var(--transition-normal);
  }

  .nav-links.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }

  .nav-link {
    font-size: var(--font-size-base);
    width: 100%;
    padding: 8px 0;
  }

  .header-actions .btn {
    display: none;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

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