/* ==========================================================================
   AquaVerify — Modern Demo Showcase & Live In-Browser Simulator Styles
   OneAquaHealth × IEEE Global Hackathon | Track 1: Citizen Science UX
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Design System & CSS Custom Properties (Section 4 Tokens)
   -------------------------------------------------------------------------- */
:root {
  /* Brand Palette */
  --color-primary-navy:     #17324D; /* Deep oceanic navy */
  --color-primary-teal:     #2D8C88; /* Freshwater teal */
  --color-dark-teal:        #1E5E5B; /* Hover states, active borders */
  --color-background:       #F4F8F7; /* Soft aquatic off-white */
  --color-card-surface:     #FFFFFF; /* Pure white card containers */

  /* Typography Colors */
  --color-text-primary:     #1E293B; /* Slate 800 */
  --color-text-muted:       #64748B; /* Slate 500 */
  --color-text-light:       #94A3B8; /* Slate 400 */
  --color-text-on-dark:     #FFFFFF;

  /* Structural & Interactive */
  --color-border:           #E2E8F0; /* Slate 200 */
  --color-border-hover:     #CBD5E1; /* Slate 300 */
  --color-input-bg:         #F8FAFC; /* Slate 50 */
  --color-light-teal:       #E0F3F0; /* Selected chip surfaces */
  --color-light-blue:       #E0F2FE; /* Info tooltips, demo badges */

  /* Status & Ecological Feedback */
  --color-success:          #059669; /* Emerald 600 - "Clear", "None noticed" */
  --color-success-surface:  #D1FAE5; /* Emerald 50 */
  --color-warning:          #D97706; /* Amber 600 - "Slightly cloudy", "Mild odour" */
  --color-warning-surface:  #FEF3C7; /* Amber 50 */
  --color-danger:           #DC2626; /* Red 600 - "Very cloudy", "Strong odour" */
  --color-danger-surface:   #FEE2E2; /* Red 50 */
  --color-info:             #0284C7; /* Sky 600 */
  --color-info-surface:     #E0F2FE; /* Sky 50 */

  /* Typography */
  --font-heading:           'Outfit', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-body:              'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono:              'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;

  /* Elevation & Geometry */
  --radius-card:            16px;
  --radius-button:          12px;
  --radius-pill:            24px;
  --radius-sm:              8px;
  
  --shadow-sm:              0 1px 3px rgba(23, 50, 77, 0.05);
  --shadow-card:            0 2px 8px -2px rgba(23, 50, 77, 0.06), 0 1px 4px -1px rgba(23, 50, 77, 0.04);
  --shadow-hover:           0 12px 24px -4px rgba(23, 50, 77, 0.12), 0 4px 8px -2px rgba(23, 50, 77, 0.06);
  --shadow-elevated:        0 20px 40px -8px rgba(23, 50, 77, 0.18), 0 8px 16px -4px rgba(23, 50, 77, 0.08);

  /* Container */
  --max-width-content:      1240px;
  --header-height:          72px;

  /* Transitions */
  --transition-fast:        0.15s ease;
  --transition-normal:      0.25s ease;
  --transition-slow:        0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  background-color: var(--color-background);
  color: var(--color-text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}

/* Headings */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  color: var(--color-primary-navy);
  font-weight: 700;
  line-height: 1.25;
}

p {
  color: var(--color-text-primary);
}

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

a:hover {
  color: var(--color-dark-teal);
}

button {
  font-family: var(--font-body);
  cursor: pointer;
  border: none;
  outline: none;
  background: none;
}

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

/* Scrollbar Styling */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: #EDF3F2;
}
::-webkit-scrollbar-thumb {
  background: #CBD5E1;
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: #94A3B8;
}

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

.section-wrapper {
  padding: 96px 0;
  position: relative;
}

.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 56px auto;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-heading);
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-primary-teal);
  background-color: var(--color-light-teal);
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  margin-bottom: 16px;
}

.section-title {
  font-size: 2.25rem;
  font-weight: 800;
  color: var(--color-primary-navy);
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.section-subtitle {
  font-size: 1.125rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* Badges & Chips */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: var(--radius-pill);
}

.badge-citizen {
  background-color: var(--color-success-surface);
  color: var(--color-success);
  border: 1px solid #A7F3D0;
}

.badge-demo {
  background-color: var(--color-info-surface);
  color: var(--color-info);
  border: 1px solid #BAE6FD;
}

.badge-clarity-clear {
  background-color: var(--color-success-surface);
  color: var(--color-success);
}

.badge-clarity-cloudy {
  background-color: var(--color-warning-surface);
  color: var(--color-warning);
}

.badge-clarity-verycloudy {
  background-color: var(--color-danger-surface);
  color: var(--color-danger);
}

.badge-clarity-unsure {
  background-color: #F1F5F9;
  color: #64748B;
}

/* Button Component Styles */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.9375rem;
  padding: 12px 22px;
  border-radius: var(--radius-button);
  transition: all var(--transition-normal);
  text-decoration: none;
  white-space: nowrap;
}

.btn-primary {
  background-color: var(--color-primary-teal);
  color: var(--color-text-on-dark);
  box-shadow: 0 4px 14px rgba(45, 140, 136, 0.25);
}

.btn-primary:hover {
  background-color: var(--color-dark-teal);
  color: var(--color-text-on-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(45, 140, 136, 0.35);
}

.btn-navy {
  background-color: var(--color-primary-navy);
  color: var(--color-text-on-dark);
  box-shadow: 0 4px 14px rgba(23, 50, 77, 0.2);
}

.btn-navy:hover {
  background-color: #102438;
  color: var(--color-text-on-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(23, 50, 77, 0.3);
}

.btn-outline {
  border: 1.5px solid var(--color-border);
  color: var(--color-primary-navy);
  background-color: var(--color-card-surface);
}

.btn-outline:hover {
  border-color: var(--color-primary-teal);
  color: var(--color-primary-teal);
  background-color: var(--color-light-teal);
  transform: translateY(-2px);
}

.btn-ghost {
  color: var(--color-primary-navy);
  background-color: transparent;
}

.btn-ghost:hover {
  background-color: rgba(23, 50, 77, 0.05);
}

.btn-sm {
  padding: 8px 14px;
  font-size: 0.8125rem;
  border-radius: 8px;
}

.btn-lg {
  padding: 15px 30px;
  font-size: 1.0625rem;
  border-radius: var(--radius-button);
}

/* --------------------------------------------------------------------------
   3. Header & Sticky Glassmorphism Navigation
   -------------------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background-color: rgba(244, 248, 247, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(226, 232, 240, 0.85);
  height: var(--header-height);
  transition: all var(--transition-normal);
}

.site-header.scrolled {
  background-color: rgba(255, 255, 255, 0.96);
  box-shadow: 0 4px 20px rgba(23, 50, 77, 0.08);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: 1400px;
  width: 100%;
  gap: 16px;
}

.brand-group {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.brand-wrapper {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  flex-shrink: 0;
}

.brand-logo-img {
  width: 36px;
  height: 36px;
  object-fit: contain;
  border-radius: 8px;
  flex-shrink: 0;
}

.brand-text-block {
  display: flex;
  flex-direction: column;
}

.brand-title {
  font-family: var(--font-heading);
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--color-primary-navy);
  line-height: 1.1;
  letter-spacing: -0.015em;
  white-space: nowrap;
}

.brand-tagline {
  font-size: 0.6875rem;
  font-weight: 600;
  color: var(--color-primary-teal);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  white-space: nowrap;
}

.hackathon-badge-nav {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  background: rgba(45, 140, 136, 0.1);
  color: var(--color-primary-teal);
  font-size: 0.72rem;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(45, 140, 136, 0.25);
  white-space: nowrap;
  flex-shrink: 0;
  line-height: 1.2;
}

.desktop-nav {
  display: flex;
  align-items: center;
  flex-shrink: 1;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 20px;
  list-style: none;
}

.nav-link {
  font-family: var(--font-heading);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text-primary);
  text-decoration: none;
  position: relative;
  padding: 6px 2px;
  white-space: nowrap;
  letter-spacing: -0.01em;
  transition: color var(--transition-fast);
}

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

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-primary-teal);
  transition: width var(--transition-normal);
}

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.nav-actions .btn {
  padding: 7px 14px;
  font-size: 0.8125rem;
  border-radius: 8px;
  white-space: nowrap;
}

.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  padding: 8px;
  color: var(--color-primary-navy);
  cursor: pointer;
  border-radius: 8px;
  transition: background-color var(--transition-fast);
}

.mobile-menu-toggle:hover {
  background-color: rgba(23, 50, 77, 0.06);
}

/* Mobile Nav Drawer */
.mobile-nav-drawer {
  display: none;
  position: absolute;
  top: var(--header-height);
  left: 0;
  right: 0;
  background-color: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border);
  box-shadow: 0 12px 24px rgba(23, 50, 77, 0.1);
  padding: 20px 24px 28px 24px;
  transform: translateY(-8px);
  opacity: 0;
  pointer-events: none;
  transition: transform var(--transition-normal), opacity var(--transition-normal);
}

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

.mobile-nav-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 20px;
}

.mobile-nav-link {
  font-family: var(--font-heading);
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--color-text-primary);
  text-decoration: none;
  display: block;
  padding: 8px 0;
  border-bottom: 1px solid rgba(226, 232, 240, 0.6);
  transition: color var(--transition-fast), padding-left var(--transition-fast);
}

.mobile-nav-link:hover {
  color: var(--color-primary-teal);
  padding-left: 6px;
}

.mobile-nav-actions {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

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

/* --------------------------------------------------------------------------
   4. Hero Section
   -------------------------------------------------------------------------- */
.hero-section {
  padding: 64px 0 80px 0;
  position: relative;
  overflow: hidden;
  background: linear-gradient(180deg, #F4F8F7 0%, #EBF4F2 100%);
}

.hero-glow-blob {
  position: absolute;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(45, 140, 136, 0.15) 0%, rgba(244, 248, 247, 0) 70%);
  top: -100px;
  right: -100px;
  pointer-events: none;
  z-index: 1;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 48px;
  align-items: center;
  position: relative;
  z-index: 2;
}

.hero-pill-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: #FFFFFF;
  border: 1px solid rgba(45, 140, 136, 0.3);
  box-shadow: var(--shadow-sm);
  padding: 6px 16px;
  border-radius: var(--radius-pill);
  font-family: var(--font-heading);
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--color-primary-navy);
  margin-bottom: 24px;
}

.hero-pill-badge .sparkle-icon {
  color: #D97706;
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.12;
  color: var(--color-primary-navy);
  margin-bottom: 20px;
  letter-spacing: -0.03em;
}

.hero-title-accent {
  background: linear-gradient(135deg, var(--color-primary-teal) 0%, #17324D 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-description {
  font-size: 1.25rem;
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-bottom: 32px;
  max-width: 620px;
}

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

.hero-trust-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 20px;
  padding-top: 24px;
  border-top: 1px solid rgba(226, 232, 240, 0.8);
}

.trust-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-primary-navy);
}

.trust-icon-wrap {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--color-light-teal);
  color: var(--color-primary-teal);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.875rem;
}

/* Hero Right Column: Device Teaser / Live Card Showcase */
.hero-visual-card {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-showcase-frame {
  width: 100%;
  max-width: 380px;
  background: #FFFFFF;
  border-radius: 24px;
  padding: 16px;
  box-shadow: var(--shadow-elevated);
  border: 1px solid var(--color-border);
  position: relative;
  transition: transform var(--transition-slow);
}

.hero-showcase-frame:hover {
  transform: translateY(-6px);
}

.hero-preview-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 12px 14px 12px;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 14px;
}

.preview-status-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--color-success);
}

.pulse-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--color-success);
  box-shadow: 0 0 0 rgba(5, 150, 105, 0.4);
  animation: pulseAnimation 2s infinite;
}

@keyframes pulseAnimation {
  0% { box-shadow: 0 0 0 0 rgba(5, 150, 105, 0.7); }
  70% { box-shadow: 0 0 0 8px rgba(5, 150, 105, 0); }
  100% { box-shadow: 0 0 0 0 rgba(5, 150, 105, 0); }
}

.hero-showcase-img {
  width: 100%;
  border-radius: 16px;
  box-shadow: 0 4px 12px rgba(23, 50, 77, 0.08);
}

.floating-hero-pill {
  position: absolute;
  background: #FFFFFF;
  padding: 10px 16px;
  border-radius: 14px;
  box-shadow: 0 10px 25px -3px rgba(23, 50, 77, 0.15);
  border: 1px solid rgba(226, 232, 240, 0.9);
  display: flex;
  align-items: center;
  gap: 10px;
  z-index: 10;
  white-space: nowrap;
  animation: floatSubtle 4s ease-in-out infinite;
}

.floating-pill-left {
  top: 540px;
  left: -52px;
  animation-delay: 0s;
}

.floating-pill-right {
  top: 370px;
  right: -52px;
  animation-delay: 2s;
}

@keyframes floatSubtle {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

.floating-pill-icon {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.125rem;
}

.floating-pill-icon.teal {
  background: var(--color-light-teal);
  color: var(--color-primary-teal);
}

.floating-pill-icon.amber {
  background: var(--color-warning-surface);
  color: var(--color-warning);
}

.floating-pill-text {
  font-size: 0.8125rem;
  line-height: 1.25;
}

.floating-pill-title {
  font-weight: 700;
  color: var(--color-primary-navy);
}

.floating-pill-sub {
  color: var(--color-text-muted);
}

/* --------------------------------------------------------------------------
   5. The Problem vs. AquaVerify (Comparison Section)
   -------------------------------------------------------------------------- */
.comparison-section {
  background-color: #FFFFFF;
}

.trilemma-infographic {
  background: linear-gradient(135deg, #17324D 0%, #1e4263 100%);
  color: #FFFFFF;
  border-radius: var(--radius-card);
  padding: 36px 40px;
  margin-bottom: 56px;
  box-shadow: var(--shadow-hover);
  position: relative;
  overflow: hidden;
}

.trilemma-infographic::after {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 300px;
  height: 100%;
  background: radial-gradient(circle, rgba(45, 140, 136, 0.25) 0%, transparent 70%);
  pointer-events: none;
}

.trilemma-grid {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 36px;
  align-items: center;
}

.trilemma-header h3 {
  color: #FFFFFF;
  font-size: 1.5rem;
  margin-bottom: 12px;
}

.trilemma-header p {
  color: #CBD5E1;
  font-size: 0.9375rem;
  line-height: 1.6;
}

.trilemma-breakthrough-box {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(45, 140, 136, 0.5);
  border-radius: 12px;
  padding: 20px 24px;
  backdrop-filter: blur(8px);
}

.breakthrough-label {
  font-family: var(--font-heading);
  font-size: 0.75rem;
  font-weight: 800;
  color: #5EEAD4;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.breakthrough-text {
  font-size: 1.0625rem;
  font-weight: 600;
  color: #FFFFFF;
  line-height: 1.45;
}

.comparison-table-wrapper {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
}

.comparison-column {
  border-radius: var(--radius-card);
  padding: 32px;
  transition: transform var(--transition-normal);
}

.column-traditional {
  background-color: #FFF7F7;
  border: 1.5px solid #FEE2E2;
}

.column-aqua {
  background-color: #F0FDF4;
  border: 2px solid #86EFAC;
  box-shadow: 0 8px 24px -4px rgba(5, 150, 105, 0.12);
}

.column-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 24px;
  padding-bottom: 18px;
  border-bottom: 1px solid rgba(0, 0, 0, 0.08);
}

.col-icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.375rem;
}

.col-icon.traditional {
  background: #FEE2E2;
  color: var(--color-danger);
}

.col-icon.aqua {
  background: #DCFCE7;
  color: var(--color-success);
}

.col-title {
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--color-primary-navy);
}

.col-sub {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

.comparison-items-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.comparison-card-item {
  display: flex;
  gap: 14px;
  font-size: 0.9375rem;
  line-height: 1.5;
}

.item-indicator {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.875rem;
  font-weight: 700;
  margin-top: 2px;
}

.item-indicator.bad {
  background: #FEE2E2;
  color: var(--color-danger);
}

.item-indicator.good {
  background: #DCFCE7;
  color: var(--color-success);
}

.item-content h5 {
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--color-primary-navy);
  margin-bottom: 4px;
}

.item-content p {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

/* --------------------------------------------------------------------------
   6. Crown Jewel: The Live In-Browser Phone Simulator Section
   -------------------------------------------------------------------------- */
.simulator-section {
  background-color: #F4F8F7;
  position: relative;
}

.simulator-layout-grid {
  display: grid;
  grid-template-columns: 440px 1fr;
  gap: 48px;
  align-items: start;
}

/* Simulator Phone Hardware Chassis */
.phone-mockup-wrapper {
  position: sticky;
  top: 100px;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.phone-hardware-chassis {
  width: 390px;
  height: 790px;
  background-color: #0F172A;
  border-radius: 50px;
  padding: 12px;
  box-shadow: 
    0 25px 60px -15px rgba(23, 50, 77, 0.35),
    0 0 0 10px #1E293B,
    0 0 0 13px #334155,
    inset 0 0 15px rgba(255, 255, 255, 0.15);
  position: relative;
  display: flex;
  flex-direction: column;
  user-select: none;
}

/* Dynamic Island / Speaker & Camera */
.phone-notch-bar {
  position: absolute;
  top: 20px;
  left: 50%;
  transform: translateX(-50%);
  width: 120px;
  height: 28px;
  background-color: #000000;
  border-radius: 20px;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 12px;
}

.notch-camera-lens {
  width: 11px;
  height: 11px;
  background: #111827;
  border-radius: 50%;
  box-shadow: inset 0 0 3px #1E3A8A;
}

.notch-sensor-dot {
  width: 7px;
  height: 7px;
  background: #030712;
  border-radius: 50%;
}

/* Phone Screen Viewport */
.phone-screen-viewport {
  width: 100%;
  height: 100%;
  background-color: var(--color-background);
  border-radius: 40px;
  overflow: hidden;
  position: relative;
  display: flex;
  flex-direction: column;
  box-shadow: inset 0 0 6px rgba(0, 0, 0, 0.1);
}

/* Phone Status Bar */
.phone-status-bar {
  height: 44px;
  padding: 8px 24px 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--color-primary-navy);
  z-index: 50;
  background: transparent;
  flex-shrink: 0;
}

.status-left {
  display: flex;
  align-items: center;
  padding-left: 6px;
}

.status-right {
  display: flex;
  align-items: center;
  gap: 6px;
  padding-right: 6px;
  font-size: 0.75rem;
}

/* Phone App Inner Content Area */
.phone-app-content {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  position: relative;
  display: flex;
  flex-direction: column;
  scroll-behavior: smooth;
}

/* Phone Bottom Gesture Bar */
.phone-home-indicator-bar {
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  background: transparent;
  z-index: 50;
}

.home-indicator-pill {
  width: 130px;
  height: 4px;
  background-color: #94A3B8;
  border-radius: 3px;
  opacity: 0.7;
}

/* Simulator Side Controls & Tour Panel */
.simulator-tour-panel {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.tour-card {
  background: #FFFFFF;
  border-radius: var(--radius-card);
  padding: 28px;
  box-shadow: var(--shadow-card);
  border: 1px solid var(--color-border);
}

.tour-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 18px;
}

.tour-card-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary-navy);
}

.tour-jump-nav {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
  margin-bottom: 20px;
}

.tour-jump-btn {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  background-color: var(--color-input-bg);
  border: 1.5px solid var(--color-border);
  border-radius: 10px;
  font-family: var(--font-heading);
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-text-primary);
  text-align: left;
  transition: all var(--transition-fast);
}

.tour-jump-btn:hover, .tour-jump-btn.active {
  background-color: var(--color-light-teal);
  border-color: var(--color-primary-teal);
  color: var(--color-dark-teal);
  transform: translateX(3px);
}

.tour-jump-btn .jump-icon {
  font-size: 1rem;
}

.presets-container {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 14px;
}

.preset-chip-btn {
  background-color: var(--color-light-teal);
  color: var(--color-dark-teal);
  border: 1px solid rgba(45, 140, 136, 0.3);
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  font-size: 0.8125rem;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all var(--transition-fast);
}

.preset-chip-btn:hover {
  background-color: var(--color-primary-teal);
  color: #FFFFFF;
}

.sim-storage-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-top: 18px;
  padding-top: 18px;
  border-top: 1px solid var(--color-border);
}

.storage-stat-box {
  background: var(--color-input-bg);
  padding: 12px;
  border-radius: 10px;
  text-align: center;
  border: 1px solid var(--color-border);
}

.storage-stat-num {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--color-primary-teal);
  line-height: 1.1;
}

.storage-stat-lbl {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  font-weight: 600;
  margin-top: 4px;
}

/* --------------------------------------------------------------------------
   7. Inside the Simulator: Screens & Component UI
   -------------------------------------------------------------------------- */
.sim-screen {
  display: none;
  flex-direction: column;
  min-height: 100%;
  padding: 16px;
  animation: fadeInFast 0.25s ease-out forwards;
}

.sim-screen.active {
  display: flex;
}

@keyframes fadeInFast {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Simulator Screen 1: Welcome */
.sim-welcome-header {
  text-align: center;
  padding: 24px 12px 16px 12px;
}

.sim-app-icon {
  width: 64px;
  height: 64px;
  border-radius: 16px;
  margin: 0 auto 14px auto;
  box-shadow: 0 8px 16px rgba(45, 140, 136, 0.25);
}

.sim-welcome-title {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--color-primary-navy);
  margin-bottom: 6px;
}

.sim-welcome-tagline {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  line-height: 1.4;
}

.sim-feature-stack {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin: 18px 0;
}

.sim-feature-mini-card {
  background: #FFFFFF;
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 12px 14px;
  display: flex;
  align-items: center;
  gap: 12px;
  box-shadow: var(--shadow-sm);
}

.sim-mini-icon {
  width: 34px;
  height: 34px;
  border-radius: 8px;
  background: var(--color-light-teal);
  color: var(--color-primary-teal);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  flex-shrink: 0;
}

.sim-mini-text h6 {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--color-primary-navy);
}

.sim-mini-text p {
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

.sim-cta-container {
  margin-top: auto;
  padding-top: 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

/* Simulator Screen 2: Dashboard */
.sim-app-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 4px 0 14px 0;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 14px;
}

.sim-app-bar-title {
  font-size: 1.125rem;
  font-weight: 800;
  color: var(--color-primary-navy);
}

.sim-app-bar-btn {
  padding: 6px 10px;
  border-radius: 8px;
  background: transparent;
  color: var(--color-text-muted);
  font-size: 1rem;
  display: flex;
  align-items: center;
  gap: 4px;
}

.sim-app-bar-btn:hover {
  background: rgba(0, 0, 0, 0.05);
  color: var(--color-primary-navy);
}

.sim-dashboard-metrics {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  margin-bottom: 14px;
}

.metric-pill-box {
  background: #FFFFFF;
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 10px 8px;
  text-align: center;
}

.metric-num {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--color-primary-teal);
}

.metric-lbl {
  font-size: 0.6875rem;
  color: var(--color-text-muted);
  font-weight: 600;
  margin-top: 2px;
}

.sim-action-banner {
  background: linear-gradient(135deg, var(--color-primary-teal) 0%, #1E5E5B 100%);
  color: #FFFFFF;
  border-radius: 14px;
  padding: 16px;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: 0 4px 14px rgba(45, 140, 136, 0.25);
  cursor: pointer;
  transition: transform var(--transition-fast);
}

.sim-action-banner:hover {
  transform: translateY(-2px);
}

.sim-action-banner h5 {
  font-size: 1rem;
  color: #FFFFFF;
  margin-bottom: 4px;
}

.sim-action-banner p {
  font-size: 0.75rem;
  color: #E0F3F0;
}

.banner-play-icon {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  flex-shrink: 0;
}

.sim-section-header-compact {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin: 12px 0 8px 0;
}

.compact-title {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--color-primary-navy);
}

.compact-link {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-primary-teal);
}

.recent-feed-stack {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.recent-feed-item {
  background: #FFFFFF;
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 10px 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.recent-feed-item:hover {
  border-color: var(--color-primary-teal);
  background-color: #FAFDFD;
}

.feed-item-left h6 {
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--color-primary-navy);
}

.feed-item-left p {
  font-size: 0.6875rem;
  color: var(--color-text-muted);
}

/* Simulator Screen 3: 4-Step Wizard Form */
.wizard-header-bar {
  margin-bottom: 14px;
}

.wizard-step-indicator {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
}

.step-label {
  font-family: var(--font-heading);
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--color-primary-navy);
}

.step-percentage {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--color-primary-teal);
}

.wizard-progress-track {
  width: 100%;
  height: 6px;
  background-color: var(--color-border);
  border-radius: 3px;
  overflow: hidden;
}

.wizard-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-primary-teal), #5EEAD4);
  border-radius: 3px;
  transition: width 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.form-group-block {
  margin-bottom: 16px;
}

.form-label {
  display: block;
  font-family: var(--font-heading);
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--color-primary-navy);
  margin-bottom: 6px;
}

.form-label .req {
  color: var(--color-danger);
}

.form-text-input {
  width: 100%;
  padding: 10px 12px;
  background-color: var(--color-input-bg);
  border: 1.5px solid var(--color-border);
  border-radius: 10px;
  font-family: var(--font-body);
  font-size: 0.875rem;
  color: var(--color-text-primary);
  outline: none;
  transition: border-color var(--transition-fast);
}

.form-text-input:focus {
  border-color: var(--color-primary-teal);
  background-color: #FFFFFF;
}

.form-text-input.input-error {
  border-color: var(--color-danger);
  background-color: var(--color-danger-surface);
}

.error-hint {
  font-size: 0.6875rem;
  color: var(--color-danger);
  margin-top: 4px;
  display: none;
}

.error-hint.visible {
  display: block;
}

/* Horizontal scrolling chips */
.horizontal-chip-scroll {
  display: flex;
  overflow-x: auto;
  gap: 8px;
  padding-bottom: 6px;
  scrollbar-width: none;
}
.horizontal-chip-scroll::-webkit-scrollbar {
  display: none;
}

.form-chip {
  padding: 6px 12px;
  background: #FFFFFF;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-pill);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-text-primary);
  white-space: nowrap;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.form-chip:hover {
  border-color: var(--color-primary-teal);
}

.form-chip.selected {
  background-color: var(--color-light-teal);
  border-color: var(--color-primary-teal);
  color: var(--color-dark-teal);
  font-weight: 700;
}

.demo-preset-chip {
  background-color: #F8FAFC;
  border-style: dashed;
}

.demo-preset-chip:hover {
  background-color: var(--color-light-blue);
  border-color: #38BDF8;
}

/* Vertical choice option pills */
.option-pill-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 8px;
}

.option-pill {
  padding: 10px 14px;
  background-color: #FFFFFF;
  border: 1.5px solid var(--color-border);
  border-radius: 10px;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--color-text-primary);
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.option-pill:hover {
  border-color: var(--color-primary-teal);
  background-color: #FAFCFC;
}

.option-pill.selected {
  background-color: var(--color-light-teal);
  border-color: var(--color-primary-teal);
  color: var(--color-dark-teal);
  font-weight: 700;
}

.option-pill.selected::after {
  content: '';
  width: 16px;
  height: 16px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%232D8C88' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='20 6 9 17 4 12'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: center;
  background-size: contain;
}

/* Expandable "Why We Ask This" Card */
.guidance-accordion {
  background-color: #FFFBEB;
  border: 1px solid #FDE68A;
  border-radius: 10px;
  overflow: hidden;
  margin-bottom: 12px;
  transition: all var(--transition-normal);
}

.guidance-toggle-btn {
  width: 100%;
  padding: 8px 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.75rem;
  font-weight: 700;
  color: #B45309;
  cursor: pointer;
  text-align: left;
}

.guidance-body {
  padding: 0 12px 10px 12px;
  font-size: 0.75rem;
  color: #78350F;
  line-height: 1.45;
  display: none;
}

.guidance-accordion.open .guidance-body {
  display: block;
}

.guidance-accordion.open .accordion-arrow {
  transform: rotate(180deg);
}

.accordion-arrow {
  transition: transform var(--transition-fast);
}

/* Safety Alert Card */
.safety-alert-banner {
  background-color: var(--color-danger-surface);
  border: 1px solid #FCA5A5;
  border-radius: 10px;
  padding: 10px 12px;
  display: flex;
  gap: 10px;
  margin: 12px 0;
}

.safety-alert-icon {
  color: var(--color-danger);
  font-size: 1.125rem;
  flex-shrink: 0;
}

.safety-alert-text {
  font-size: 0.75rem;
  color: #991B1B;
  line-height: 1.4;
  font-weight: 500;
}

.sim-nav-btn-row {
  display: flex;
  gap: 10px;
  margin-top: auto;
  padding-top: 16px;
}

/* Simulator Screen 4: Review & Validation */
.review-summary-card {
  background: #FFFFFF;
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 12px 14px;
  margin-bottom: 10px;
}

.review-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--color-border);
}

.review-card-header h6 {
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--color-primary-navy);
}

.review-edit-btn {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--color-primary-teal);
  cursor: pointer;
}

.review-row {
  display: flex;
  justify-content: space-between;
  font-size: 0.75rem;
  padding: 3px 0;
}

.review-label {
  color: var(--color-text-muted);
}

.review-val {
  font-weight: 600;
  color: var(--color-primary-navy);
  text-align: right;
  max-width: 60%;
}

.disclaimer-compliance-card {
  background: #FFFBEB;
  border: 1.5px solid #FCD34D;
  border-radius: 12px;
  padding: 14px;
  margin: 14px 0;
}

.disclaimer-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8125rem;
  font-weight: 800;
  color: #92400E;
  margin-bottom: 6px;
}

.disclaimer-body {
  font-size: 0.75rem;
  color: #78350F;
  line-height: 1.45;
  margin-bottom: 12px;
}

.disclaimer-checkbox-label {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  cursor: pointer;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--color-primary-navy);
  line-height: 1.35;
}

.disclaimer-checkbox-label input[type="checkbox"] {
  width: 16px;
  height: 16px;
  accent-color: var(--color-primary-teal);
  margin-top: 2px;
  flex-shrink: 0;
}

/* Simulator Screen 5: History & Search */
.sim-search-bar-wrap {
  position: relative;
  margin-bottom: 10px;
}

.sim-search-input {
  width: 100%;
  padding: 8px 12px 8px 34px;
  background-color: #FFFFFF;
  border: 1.5px solid var(--color-border);
  border-radius: 10px;
  font-size: 0.8125rem;
  outline: none;
}

.sim-search-icon {
  position: absolute;
  left: 10px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-text-muted);
  font-size: 0.875rem;
}

.sim-scope-tabs {
  display: flex;
  background: #E2E8F0;
  border-radius: 10px;
  padding: 3px;
  margin-bottom: 10px;
}

.scope-tab-btn {
  flex: 1;
  padding: 6px 4px;
  font-size: 0.6875rem;
  font-weight: 700;
  text-align: center;
  border-radius: 7px;
  color: var(--color-text-muted);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.scope-tab-btn.active {
  background: #FFFFFF;
  color: var(--color-primary-navy);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.sim-history-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  overflow-y: auto;
  padding-bottom: 10px;
}

.sim-history-card {
  background: #FFFFFF;
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 12px;
  box-shadow: var(--shadow-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.sim-history-card:hover {
  border-color: var(--color-primary-teal);
  box-shadow: var(--shadow-card);
}

.history-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 6px;
}

.history-location-title {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--color-primary-navy);
}

.history-meta-row {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.6875rem;
  color: var(--color-text-muted);
  margin-bottom: 8px;
}

.history-badges-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
}

.history-notes-preview {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  margin-top: 8px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.history-card-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 10px;
  padding-top: 8px;
  border-top: 1px solid #F1F5F9;
}

.card-del-btn {
  color: #94A3B8;
  font-size: 0.8125rem;
  padding: 4px;
}
.card-del-btn:hover {
  color: var(--color-danger);
}

/* Simulator Screen 6: Observation Details */
.detail-header-card {
  background: #FFFFFF;
  border: 1px solid var(--color-border);
  border-radius: 14px;
  padding: 16px;
  margin-bottom: 12px;
}

.detail-location-name {
  font-size: 1.125rem;
  font-weight: 800;
  color: var(--color-primary-navy);
}

.detail-date-str {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  margin-top: 2px;
}

.detail-param-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-bottom: 12px;
}

.param-card-small {
  background: #FFFFFF;
  border: 1px solid var(--color-border);
  border-radius: 10px;
  padding: 8px 10px;
}

.param-card-lbl {
  font-size: 0.6875rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
  font-weight: 700;
}

.param-card-val {
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--color-primary-navy);
  margin-top: 2px;
}

.copy-report-card {
  background: #F8FAFC;
  border: 1px solid var(--color-border);
  border-radius: 10px;
  padding: 12px;
  margin-top: 12px;
}

.copy-report-code {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  background: #FFFFFF;
  border: 1px solid #E2E8F0;
  border-radius: 6px;
  padding: 8px;
  color: #334155;
  white-space: pre-wrap;
  word-break: break-all;
  max-height: 120px;
  overflow-y: auto;
  margin-bottom: 10px;
}

/* Toast Notification inside phone simulator */
.sim-toast {
  position: absolute;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background-color: #0F172A;
  color: #FFFFFF;
  padding: 8px 16px;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 6px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
  opacity: 0;
  pointer-events: none;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  z-index: 200;
}

.sim-toast.visible {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* --------------------------------------------------------------------------
   8. The Six UX Innovation Pillars Section
   -------------------------------------------------------------------------- */
.pillars-section {
  background-color: #FFFFFF;
}

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

.pillar-card {
  background: #FFFFFF;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 32px 28px;
  box-shadow: var(--shadow-card);
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}

.pillar-card:hover {
  transform: translateY(-6px);
  border-color: var(--color-primary-teal);
  box-shadow: var(--shadow-hover);
}

.pillar-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--color-primary-teal), #5EEAD4);
  opacity: 0;
  transition: opacity var(--transition-normal);
}

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

.pillar-icon-box {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  background-color: var(--color-light-teal);
  color: var(--color-primary-teal);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 20px;
}

.pillar-number {
  position: absolute;
  top: 24px;
  right: 24px;
  font-family: var(--font-heading);
  font-size: 1.75rem;
  font-weight: 800;
  color: #E2E8F0;
}

.pillar-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary-navy);
  margin-bottom: 12px;
}

.pillar-quote {
  font-size: 0.875rem;
  font-style: italic;
  color: var(--color-primary-teal);
  margin-bottom: 14px;
  font-weight: 600;
}

.pillar-desc {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-bottom: 20px;
  flex-grow: 1;
}

.pillar-contrast-box {
  background: var(--color-input-bg);
  border-radius: 10px;
  padding: 12px;
  font-size: 0.8125rem;
  border-left: 3px solid var(--color-primary-teal);
}

.contrast-row {
  margin-bottom: 4px;
}

.contrast-row:last-child {
  margin-bottom: 0;
}

.contrast-tag {
  font-weight: 700;
  font-size: 0.75rem;
  text-transform: uppercase;
}

.contrast-tag.bad {
  color: var(--color-danger);
}

.contrast-tag.good {
  color: var(--color-success);
}

/* --------------------------------------------------------------------------
   9. Scientific Terminology Translation Matrix Section
   -------------------------------------------------------------------------- */
.matrix-section {
  background-color: #F4F8F7;
}

.matrix-controls-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  background: #FFFFFF;
  padding: 16px 20px;
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
  margin-bottom: 24px;
}

.matrix-search-box {
  position: relative;
  flex: 1;
  min-width: 260px;
}

.matrix-search-input {
  width: 100%;
  padding: 10px 14px 10px 38px;
  background-color: var(--color-input-bg);
  border: 1.5px solid var(--color-border);
  border-radius: 10px;
  font-family: var(--font-body);
  font-size: 0.875rem;
  color: var(--color-text-primary);
  outline: none;
  transition: border-color var(--transition-fast);
}

.matrix-search-input:focus {
  border-color: var(--color-primary-teal);
  background: #FFFFFF;
}

.matrix-search-icon {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-text-muted);
}

.matrix-filter-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.matrix-pill {
  padding: 6px 14px;
  background: #FFFFFF;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-pill);
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-text-primary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.matrix-pill:hover {
  border-color: var(--color-primary-teal);
}

.matrix-pill.active {
  background: var(--color-primary-navy);
  color: #FFFFFF;
  border-color: var(--color-primary-navy);
}

/* Interactive Table Styles */
.matrix-table-container {
  background: #FFFFFF;
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  border: 1px solid var(--color-border);
  overflow: hidden;
}

.matrix-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

.matrix-table thead {
  background-color: #17324D;
  color: #FFFFFF;
}

.matrix-table th {
  padding: 18px 20px;
  font-family: var(--font-heading);
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.matrix-table tbody tr {
  border-bottom: 1px solid var(--color-border);
  transition: background-color var(--transition-fast);
}

.matrix-table tbody tr:hover {
  background-color: #F8FAFC;
}

.matrix-table td {
  padding: 18px 20px;
  font-size: 0.875rem;
  vertical-align: top;
  line-height: 1.5;
}

.param-scientific-name {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.9375rem;
  color: var(--color-primary-navy);
}

.param-metric-unit {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-text-muted);
  margin-top: 2px;
}

.param-question-badge {
  display: inline-block;
  background: var(--color-light-teal);
  color: var(--color-dark-teal);
  font-size: 0.875rem;
  font-weight: 600;
  padding: 6px 12px;
  border-radius: 8px;
  border-left: 3px solid var(--color-primary-teal);
}

.param-options-list {
  font-size: 0.8125rem;
  color: var(--color-text-primary);
  line-height: 1.45;
}

.param-options-list span {
  display: inline-block;
  background: #F1F5F9;
  padding: 2px 8px;
  border-radius: 4px;
  margin: 2px 2px 2px 0;
  font-size: 0.75rem;
}

.param-rationale-box {
  background: #FFFBEB;
  border: 1px solid #FCD34D;
  border-radius: 8px;
  padding: 8px 10px;
  font-size: 0.8125rem;
  color: #78350F;
  margin-bottom: 6px;
}

.param-eco-significance {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

/* --------------------------------------------------------------------------
   10. App Screenshots & Gallery Section
   -------------------------------------------------------------------------- */
.gallery-section {
  background-color: #FFFFFF;
}

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

.gallery-card {
  background: #FFFFFF;
  border-radius: var(--radius-card);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  border: 1.5px solid var(--color-border);
  cursor: pointer;
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
}

.gallery-card:hover {
  transform: translateY(-6px);
  border-color: var(--color-primary-teal);
  box-shadow: var(--shadow-hover);
}

.gallery-img-wrap {
  position: relative;
  background: #F1F5F9;
  overflow: hidden;
  height: 380px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.gallery-img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top center;
  transition: transform var(--transition-slow);
}

.gallery-card:hover .gallery-img-wrap img {
  transform: scale(1.04);
}

.gallery-zoom-overlay {
  position: absolute;
  inset: 0;
  background: rgba(23, 50, 77, 0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.gallery-card:hover .gallery-zoom-overlay {
  opacity: 1;
}

.zoom-icon-circle {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: #FFFFFF;
  color: var(--color-primary-navy);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.gallery-card-content {
  padding: 16px 20px;
}

.gallery-screen-badge {
  font-size: 0.6875rem;
  font-weight: 700;
  color: var(--color-primary-teal);
  text-transform: uppercase;
  margin-bottom: 4px;
}

.gallery-card-title {
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--color-primary-navy);
  margin-bottom: 4px;
}

.gallery-card-desc {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

/* Lightbox Modal */
.lightbox-modal {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.9);
  backdrop-filter: blur(10px);
  z-index: 2000;
  align-items: center;
  justify-content: center;
  padding: 24px;
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.lightbox-modal.open {
  display: flex;
  opacity: 1;
}

.lightbox-content-box {
  max-width: 900px;
  width: 100%;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  position: relative;
}

.lightbox-img {
  max-height: 75vh;
  max-width: 100%;
  object-fit: contain;
  border-radius: 16px;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
}

.lightbox-caption {
  color: #FFFFFF;
  margin-top: 16px;
  text-align: center;
  font-family: var(--font-heading);
  font-size: 1.125rem;
  font-weight: 600;
}

.lightbox-close-btn {
  position: absolute;
  top: -40px;
  right: 0;
  color: #FFFFFF;
  font-size: 2rem;
  cursor: pointer;
}

/* --------------------------------------------------------------------------
   11. Video Showcase & Pitch Walkthrough Section
   -------------------------------------------------------------------------- */
.video-section {
  background: linear-gradient(180deg, #17324D 0%, #0F2032 100%);
  color: #FFFFFF;
}

.video-section .section-title {
  color: #FFFFFF;
}

.video-section .section-subtitle {
  color: #94A3B8;
}

.video-section .section-tag {
  background: rgba(45, 140, 136, 0.25);
  color: #5EEAD4;
}

.video-theater-wrapper {
  display: grid;
  grid-template-columns: 1.35fr 0.85fr;
  gap: 36px;
  align-items: start;
}

.video-frame-box {
  background: #000000;
  border-radius: 20px;
  overflow: hidden;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.1);
  position: relative;
  aspect-ratio: 16 / 9;
}

.video-frame-box iframe, .video-frame-box video {
  width: 100%;
  height: 100%;
  border: none;
}

.video-poster-fallback {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, #102438 0%, #1e4263 100%);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 30px;
  text-align: center;
}

.video-play-btn-circle {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  background: var(--color-primary-teal);
  color: #FFFFFF;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  box-shadow: 0 0 0 10px rgba(45, 140, 136, 0.3);
  margin-bottom: 20px;
  cursor: pointer;
  transition: transform var(--transition-normal);
}

.video-play-btn-circle:hover {
  transform: scale(1.1);
}

.chapters-card {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 16px;
  padding: 24px;
  backdrop-filter: blur(12px);
}

.chapters-header {
  font-size: 1.125rem;
  font-weight: 700;
  color: #FFFFFF;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.chapters-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.chapter-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.05);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.chapter-item:hover, .chapter-item.active {
  background: rgba(45, 140, 136, 0.2);
  border-color: var(--color-primary-teal);
}

.chapter-time-badge {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  color: #5EEAD4;
  background: rgba(0, 0, 0, 0.3);
  padding: 3px 8px;
  border-radius: 6px;
}

.chapter-title {
  font-size: 0.875rem;
  font-weight: 600;
  color: #E2E8F0;
}

.chapter-desc-box {
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 0.8125rem;
  color: #94A3B8;
  line-height: 1.5;
}

/* --------------------------------------------------------------------------
   12. Technical Architecture & Download APK Artifacts Section
   -------------------------------------------------------------------------- */
.download-section {
  background-color: #F4F8F7;
}

.tech-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 36px;
  align-items: stretch;
}

/* APK Download Card */
.apk-card {
  background: #FFFFFF;
  border-radius: var(--radius-card);
  padding: 36px;
  box-shadow: var(--shadow-card);
  border: 2px solid rgba(45, 140, 136, 0.3);
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}

.apk-card::after {
  content: 'OFFICIAL RELEASE';
  position: absolute;
  top: 38px;
  right: -58px;
  width: 220px;
  text-align: center;
  background: linear-gradient(135deg, var(--color-primary-teal) 0%, #1E5E5B 100%);
  color: #FFFFFF;
  font-family: var(--font-heading);
  font-size: 0.6875rem;
  font-weight: 800;
  line-height: 26px;
  transform: rotate(45deg);
  letter-spacing: 0.08em;
  box-shadow: 0 2px 8px rgba(23, 50, 77, 0.2);
  pointer-events: none;
}

.apk-header-block {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 24px;
}

.apk-icon {
  width: 58px;
  height: 58px;
  border-radius: 14px;
  object-fit: contain;
  box-shadow: 0 4px 14px rgba(23, 50, 77, 0.15);
}

.apk-title-meta h4 {
  font-size: 1.375rem;
  font-weight: 800;
  color: var(--color-primary-navy);
}

.apk-version-tag {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-primary-teal);
}

.apk-specs-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-bottom: 24px;
}

.spec-tile {
  background: var(--color-input-bg);
  border: 1px solid var(--color-border);
  border-radius: 10px;
  padding: 10px 14px;
}

.spec-lbl {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  font-weight: 600;
}

.spec-val {
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--color-primary-navy);
  margin-top: 2px;
}

.sha-hash-box {
  background: #F1F5F9;
  border: 1px solid #CBD5E1;
  border-radius: 10px;
  padding: 12px;
  margin-bottom: 24px;
}

.sha-label-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 4px;
}

.sha-lbl {
  font-size: 0.6875rem;
  font-weight: 700;
  color: var(--color-text-muted);
  text-transform: uppercase;
}

.sha-copy-btn {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--color-primary-teal);
  cursor: pointer;
}

.sha-hash-text {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: #334155;
  word-break: break-all;
  user-select: all;
}

.apk-download-btn-row {
  margin-top: auto;
}

/* Architecture Flow Card */
.architecture-card {
  background: #FFFFFF;
  border-radius: var(--radius-card);
  padding: 36px;
  box-shadow: var(--shadow-card);
  border: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
}

.architecture-card h4 {
  font-size: 1.375rem;
  margin-bottom: 12px;
}

.architecture-card p {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  margin-bottom: 24px;
}

.arch-layer-stack {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.arch-layer-box {
  border: 1.5px solid var(--color-border);
  border-radius: 12px;
  padding: 14px 18px;
  background: var(--color-input-bg);
  position: relative;
  transition: all var(--transition-fast);
}

.arch-layer-box:hover {
  border-color: var(--color-primary-teal);
  background: #FFFFFF;
}

.layer-badge {
  font-size: 0.6875rem;
  font-weight: 800;
  text-transform: uppercase;
  color: var(--color-primary-teal);
  margin-bottom: 4px;
}

.layer-title {
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--color-primary-navy);
}

.layer-desc {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  margin-top: 2px;
}

/* --------------------------------------------------------------------------
   13. Evaluator FAQ Section
   -------------------------------------------------------------------------- */
.faq-section {
  background-color: #FFFFFF;
}

.faq-accordion-stack {
  max-width: 820px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: var(--color-input-bg);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-card);
  overflow: hidden;
  transition: all var(--transition-normal);
}

.faq-item.active {
  border-color: var(--color-primary-teal);
  background: #FFFFFF;
  box-shadow: var(--shadow-card);
}

.faq-question-btn {
  width: 100%;
  padding: 22px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-family: var(--font-heading);
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--color-primary-navy);
  text-align: left;
  cursor: pointer;
  background: transparent;
}

.faq-question-btn .faq-chevron {
  font-size: 1.25rem;
  color: var(--color-primary-teal);
  transition: transform var(--transition-fast);
}

.faq-item.active .faq-chevron {
  transform: rotate(180deg);
}

.faq-answer-body {
  padding: 0 24px 22px 24px;
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  line-height: 1.6;
  display: none;
}

.faq-item.active .faq-answer-body {
  display: block;
}

/* --------------------------------------------------------------------------
   14. Site Footer
   -------------------------------------------------------------------------- */
.site-footer {
  background-color: #17324D;
  color: #FFFFFF;
  padding: 64px 0 32px 0;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}

.footer-brand h4 {
  color: #FFFFFF;
  font-size: 1.5rem;
  margin-bottom: 12px;
}

.footer-brand p {
  color: #94A3B8;
  font-size: 0.875rem;
  line-height: 1.6;
  max-width: 320px;
}

.footer-col h5 {
  color: #FFFFFF;
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 18px;
}

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

.footer-links a {
  color: #94A3B8;
  font-size: 0.875rem;
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: #5EEAD4;
}

.footer-bottom-bar {
  padding-top: 32px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8125rem;
  color: #64748B;
}

.scroll-top-btn {
  background: rgba(255, 255, 255, 0.1);
  color: #FFFFFF;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.scroll-top-btn:hover {
  background: var(--color-primary-teal);
}

/* --------------------------------------------------------------------------
   15. Responsive Media Queries
   -------------------------------------------------------------------------- */
@media (max-width: 1240px) {
  .nav-links {
    gap: 14px;
  }
  .nav-link {
    font-size: 0.8125rem;
  }
  .hackathon-badge-nav {
    font-size: 0.6875rem;
    padding: 3px 8px;
  }
}

@media (max-width: 1040px) {
  .desktop-nav, .nav-actions {
    display: none;
  }
  .mobile-menu-toggle {
    display: block;
  }
  .mobile-nav-drawer {
    display: block;
  }
}

@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .hero-description {
    margin-left: auto;
    margin-right: auto;
  }
  .hero-cta-group, .hero-trust-bar {
    justify-content: center;
  }
  .simulator-layout-grid {
    grid-template-columns: 1fr;
    justify-items: center;
  }
  .phone-mockup-wrapper {
    position: static;
  }
  .pillars-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .gallery-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .video-theater-wrapper {
    grid-template-columns: 1fr;
  }
  .tech-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .hero-title {
    font-size: 2.5rem;
  }
  .trilemma-grid {
    grid-template-columns: 1fr;
  }
  .comparison-table-wrapper {
    grid-template-columns: 1fr;
  }
  .pillars-grid {
    grid-template-columns: 1fr;
  }
  .gallery-grid {
    grid-template-columns: 1fr;
  }
  .phone-hardware-chassis {
    width: 100%;
    max-width: 360px;
    height: 720px;
    padding: 8px;
    border-radius: 36px;
  }
  .phone-screen-viewport {
    border-radius: 28px;
  }
  .matrix-table-container {
    overflow-x: auto;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .footer-bottom-bar {
    flex-direction: column;
    gap: 16px;
    text-align: center;
  }
}

@media (max-width: 520px) {
  .hackathon-badge-nav {
    display: none;
  }
  .floating-hero-pill {
    display: none;
  }
}