/* ==========================================================================
   Green Log Weight Chart 3D - Light & Minimal Stylesheet
   ========================================================================== */

:root {
  --bg-dark: #f8fafc;
  --bg-card: #ffffff;
  --bg-card-hover: #ffffff;
  --bg-input: #f1f5f9;
  --border-color: #e2e8f0;
  --border-glow: rgba(217, 119, 6, 0.3);
  
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  
  --primary-amber: #d97706;
  --primary-amber-hover: #b45309;
  --accent-gold: #d97706;
  --accent-green: #16a34a;
  --accent-cyan: #0284c7;
  --accent-red: #dc2626;
  
  --font-heading: 'Plus Jakarta Sans', sans-serif;
  --font-body: 'Inter', sans-serif;
  
  --shadow-lg: 0 20px 40px -15px rgba(15, 23, 42, 0.08);
  --shadow-glow: 0 10px 25px rgba(217, 119, 6, 0.12);
  --radius-lg: 20px;
  --radius-md: 14px;
  --radius-sm: 10px;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

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

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

/* Typography & Gradient Text */
h1, h2, h3, h4 {
  font-family: var(--font-heading);
  color: var(--text-primary);
  font-weight: 700;
}

.gradient-text {
  background: linear-gradient(135deg, #d97706, #b45309);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.green-gradient-text {
  background: linear-gradient(135deg, #16a34a, #15803d);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: 12px;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  transition: all 0.25s ease;
  text-decoration: none;
  border: none;
}

.btn-primary {
  background: linear-gradient(135deg, #d97706, #b45309);
  color: #ffffff;
  box-shadow: 0 4px 14px rgba(217, 119, 6, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(217, 119, 6, 0.45);
}

.btn-secondary {
  background: #ffffff;
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

.btn-secondary:hover {
  background: #f8fafc;
  border-color: #cbd5e1;
  transform: translateY(-2px);
}

.btn-full {
  width: 100%;
}

/* App Store Badge */
.app-store-badge {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  background: #0f172a;
  border: 1px solid #1e293b;
  padding: 8px 18px;
  border-radius: 12px;
  text-decoration: none;
  color: #ffffff;
  transition: all 0.25s ease;
  box-shadow: 0 4px 12px rgba(15, 23, 42, 0.15);
}

.app-store-badge:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(15, 23, 42, 0.25);
  background: #1e293b;
}

.badge-icon i {
  font-size: 1.8rem;
}

.badge-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.badge-subtitle {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: #94a3b8;
}

.badge-title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.1rem;
}

/* Navigation Bar */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  transition: all 0.3s ease;
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}

.logo-icon {
  width: 38px;
  height: 38px;
  background: linear-gradient(135deg, #d97706, #b45309);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  font-size: 1.1rem;
  box-shadow: 0 4px 10px rgba(217, 119, 6, 0.25);
}

.logo-text {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.25rem;
  color: var(--text-primary);
}

.logo-highlight {
  color: var(--primary-amber);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.9rem;
  transition: color 0.2s ease;
}

.nav-links a:hover {
  color: var(--primary-amber);
}

.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.5rem;
  cursor: pointer;
}

/* Hero Section */
.hero-section {
  position: relative;
  padding-top: 130px;
  padding-bottom: 80px;
  overflow: hidden;
  background: linear-gradient(180deg, #ffffff 0%, #f8fafc 100%);
}

.hero-bg-glow {
  position: absolute;
  top: -100px;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(217, 119, 6, 0.08) 0%, rgba(22, 163, 74, 0.04) 40%, rgba(248, 250, 252, 0) 70%);
  pointer-events: none;
}

.hero-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background: rgba(217, 119, 6, 0.08);
  border: 1px solid rgba(217, 119, 6, 0.2);
  border-radius: 30px;
  color: #b45309;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 20px;
}

.hero-title {
  font-size: 2.8rem;
  line-height: 1.15;
  margin-bottom: 20px;
  color: var(--text-primary);
}

.hero-description {
  color: var(--text-secondary);
  font-size: 1.05rem;
  margin-bottom: 30px;
  max-width: 520px;
}

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

.hero-stats {
  display: flex;
  align-items: center;
  gap: 20px;
  padding-top: 20px;
  border-top: 1px solid var(--border-color);
}

.stat-item {
  display: flex;
  flex-direction: column;
}

.stat-number {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.4rem;
  color: var(--text-primary);
}

.stat-label {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.stat-divider {
  width: 1px;
  height: 30px;
  background: var(--border-color);
}

/* iPhone Device Mockup Frame */
.phone-frame {
  position: relative;
  width: 280px;
  max-width: 100%;
  margin: 0 auto;
  border-radius: 40px;
  background: #0f172a;
  padding: 10px;
  border: 4px solid #334155;
  box-shadow: 0 25px 50px -12px rgba(15, 23, 42, 0.18), 0 0 20px rgba(217, 119, 6, 0.1);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.phone-frame:hover {
  transform: translateY(-8px);
  box-shadow: 0 30px 60px -15px rgba(15, 23, 42, 0.25), 0 0 30px rgba(217, 119, 6, 0.2);
}

.phone-screen {
  position: relative;
  width: 100%;
  border-radius: 32px;
  overflow: hidden;
  background: #000000;
  aspect-ratio: 9 / 19.5;
}

.phone-screen img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.phone-notch {
  position: absolute;
  top: 8px;
  left: 50%;
  transform: translateX(-50%);
  width: 85px;
  height: 22px;
  background: #0f172a;
  border-radius: 12px;
  z-index: 10;
}

/* App Screenshots Gallery Showcase Section */
.app-gallery-section {
  background: #f1f5f9;
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
  padding: 80px 0;
}

.gallery-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

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

.gallery-caption {
  margin-top: 16px;
}

.gallery-caption h4 {
  font-size: 1.05rem;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.gallery-caption p {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

/* 3D Visualizer Canvas Card */
.canvas-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  position: relative;
}

.canvas-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 18px;
  background: #f8fafc;
  border-bottom: 1px solid var(--border-color);
}

.canvas-dots {
  display: flex;
  gap: 6px;
}

.dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.dot.red { background: #ef4444; }
.dot.yellow { background: #f59e0b; }
.dot.green { background: #10b981; }

.canvas-title {
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.canvas-badge {
  font-size: 0.75rem;
  padding: 3px 8px;
  background: rgba(217, 119, 6, 0.1);
  color: #b45309;
  border-radius: 6px;
}

.threejs-container {
  width: 100%;
  height: 380px;
  background: #E6EFF7;
  cursor: grab;
}

.canvas-overlay-hint {
  position: absolute;
  bottom: 12px;
  left: 50%;
  transform: translateX(-50%);
  padding: 6px 14px;
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  font-size: 0.75rem;
  color: var(--text-secondary);
  pointer-events: none;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.05);
}

/* Sections Common */
section {
  padding: 80px 0;
}

.section-header {
  text-align: center;
  max-width: 650px;
  margin: 0 auto 50px auto;
}

.section-subtitle {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 1.5px;
  color: var(--primary-amber);
  text-transform: uppercase;
  margin-bottom: 8px;
  display: block;
}

.section-title {
  font-size: 2.2rem;
  margin-bottom: 12px;
  color: var(--text-primary);
}

.section-desc {
  color: var(--text-secondary);
  font-size: 1rem;
}

/* Features Grid */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: 0 4px 20px rgba(15, 23, 42, 0.03);
  transition: all 0.3s ease;
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: #cbd5e1;
  box-shadow: var(--shadow-lg);
}

.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  margin-bottom: 20px;
}

.bg-amber { background: rgba(217, 119, 6, 0.1); color: #d97706; }
.bg-green { background: rgba(22, 163, 74, 0.1); color: #16a34a; }
.bg-blue { background: rgba(2, 132, 199, 0.1); color: #0284c7; }
.bg-purple { background: rgba(147, 51, 234, 0.1); color: #9333ea; }
.bg-red { background: rgba(220, 38, 38, 0.1); color: #dc2626; }
.bg-teal { background: rgba(13, 148, 136, 0.1); color: #0d9488; }

.feature-card h3 {
  font-size: 1.15rem;
  margin-bottom: 10px;
}

.feature-card p {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* Interactive Live Calculator Demo */
.demo-section {
  background: #ffffff;
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.demo-calculator-box {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 30px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 30px;
  box-shadow: var(--shadow-lg);
}

.demo-box-title {
  font-size: 1.1rem;
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--primary-amber);
}

.input-group {
  margin-bottom: 16px;
}

.input-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

.input-field {
  width: 100%;
  padding: 10px 14px;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 0.95rem;
  outline: none;
  transition: border-color 0.2s ease;
}

.input-field:focus {
  border-color: var(--primary-amber);
  background: #ffffff;
}

.demo-results {
  background: #f8fafc;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.result-hero {
  text-align: center;
  padding: 16px;
  background: rgba(217, 119, 6, 0.08);
  border: 1px solid rgba(217, 119, 6, 0.2);
  border-radius: var(--radius-md);
  margin-bottom: 20px;
}

.result-hero-label {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 1px;
  color: var(--text-muted);
  text-transform: uppercase;
}

.result-hero-value {
  font-family: var(--font-heading);
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--primary-amber);
  line-height: 1.2;
}

.result-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.result-card {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
}

.result-card-label {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.result-card-value {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text-primary);
}

.safety-alert-box {
  margin-top: 14px;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.85rem;
  font-weight: 600;
}

.safety-alert-box.safe {
  background: rgba(22, 163, 74, 0.1);
  border: 1px solid rgba(22, 163, 74, 0.3);
  color: #16a34a;
}

.safety-alert-box.danger {
  background: rgba(220, 38, 38, 0.1);
  border: 1px solid rgba(220, 38, 38, 0.3);
  color: #dc2626;
}

/* ANSI Safety Section */
.ansi-section {
  position: relative;
  background: #f8fafc;
}

.ansi-card {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 40px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
  box-shadow: var(--shadow-lg);
}

.ansi-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 4px 12px;
  background: rgba(22, 163, 74, 0.1);
  border: 1px solid rgba(22, 163, 74, 0.25);
  border-radius: 20px;
  color: #16a34a;
  font-size: 0.8rem;
  font-weight: 600;
  margin-bottom: 16px;
}

.ansi-checklist {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.ansi-checklist li {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.95rem;
  color: var(--text-secondary);
}

.ansi-checklist i {
  color: #16a34a;
  font-size: 1.1rem;
}

/* FAQ Accordion */
.faq-grid {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

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

.faq-question {
  width: 100%;
  padding: 18px 24px;
  background: none;
  border: none;
  color: var(--text-primary);
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1rem;
  text-align: left;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
}

.faq-question i {
  color: var(--primary-amber);
  transition: transform 0.3s ease;
}

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

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
  color: var(--text-secondary);
  font-size: 0.92rem;
  padding: 0 24px;
}

.faq-item.active .faq-answer {
  max-height: 200px;
  padding: 0 24px 20px 24px;
}

/* Privacy Policy Box */
.privacy-section {
  background: #ffffff;
  border-top: 1px solid var(--border-color);
}

.privacy-box {
  background: #f8fafc;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 40px;
}

.privacy-box h3 {
  font-size: 1.4rem;
  margin-top: 24px;
  margin-bottom: 10px;
  color: var(--primary-amber);
}

.privacy-box p {
  color: var(--text-secondary);
  margin-bottom: 14px;
  font-size: 0.95rem;
}

/* Footer */
footer {
  padding: 50px 0 30px 0;
  border-top: 1px solid var(--border-color);
  background: #f1f5f9;
}

.footer-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 30px;
}

.footer-copy {
  color: var(--text-muted);
  font-size: 0.85rem;
}

.footer-links {
  display: flex;
  gap: 20px;
}

.footer-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.85rem;
  transition: color 0.2s ease;
}

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

/* Responsive Media Queries */
@media (max-width: 992px) {
  .hero-container {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .hero-badge, .hero-description {
    margin-left: auto;
    margin-right: auto;
  }
  
  .hero-actions {
    justify-content: center;
  }
  
  .hero-stats {
    justify-content: center;
  }
  
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .gallery-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .demo-calculator-box {
    grid-template-columns: 1fr;
  }
  
  .ansi-card {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .nav-links, .nav-cta {
    display: none;
  }
  
  .mobile-menu-toggle {
    display: block;
  }
  
  .nav-links.active {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background: var(--bg-card);
    border-bottom: 1px solid var(--border-color);
    padding: 20px;
    gap: 16px;
  }
  
  .features-grid {
    grid-template-columns: 1fr;
  }
  
  .gallery-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-container {
    flex-direction: column;
    gap: 16px;
    text-align: center;
  }
}