/* ==========================================
   Egarc HP - Modern Design System
   ========================================== */

/* Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;600;700;800&display=swap');

/* ==========================================
   CSS Variables - Design Tokens
   ========================================== */
:root {
  /* Colors - Primary Palette */
  --color-primary: #6366f1;
  --color-primary-light: #818cf8;
  --color-primary-dark: #4f46e5;
  --color-secondary: #8b5cf6;
  --color-accent: #ec4899;
  
  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --gradient-hero: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
  --gradient-card: linear-gradient(135deg, rgba(102, 126, 234, 0.1) 0%, rgba(118, 75, 162, 0.1) 100%);
  
  /* Neutral Colors */
  --color-white: #ffffff;
  --color-gray-50: #f9fafb;
  --color-gray-100: #f3f4f6;
  --color-gray-200: #e5e7eb;
  --color-gray-300: #d1d5db;
  --color-gray-400: #9ca3af;
  --color-gray-500: #6b7280;
  --color-gray-600: #4b5563;
  --color-gray-700: #374151;
  --color-gray-800: #1f2937;
  --color-gray-900: #111827;
  
  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-size-xs: 0.75rem;    /* 12px */
  --font-size-sm: 0.875rem;   /* 14px */
  --font-size-base: 1rem;     /* 16px */
  --font-size-lg: 1.125rem;   /* 18px */
  --font-size-xl: 1.25rem;    /* 20px */
  --font-size-2xl: 1.5rem;    /* 24px */
  --font-size-3xl: 1.875rem;  /* 30px */
  --font-size-4xl: 2.25rem;   /* 36px */
  --font-size-5xl: 3rem;      /* 48px */
  --font-size-6xl: 3.75rem;   /* 60px */
  
  /* Spacing */
  --spacing-1: 0.25rem;   /* 4px */
  --spacing-2: 0.5rem;    /* 8px */
  --spacing-3: 0.75rem;   /* 12px */
  --spacing-4: 1rem;      /* 16px */
  --spacing-5: 1.25rem;   /* 20px */
  --spacing-6: 1.5rem;    /* 24px */
  --spacing-8: 2rem;      /* 32px */
  --spacing-10: 2.5rem;   /* 40px */
  --spacing-12: 3rem;     /* 48px */
  --spacing-16: 4rem;     /* 64px */
  --spacing-20: 5rem;     /* 80px */
  --spacing-24: 6rem;     /* 96px */
  
  /* Border Radius */
  --radius-sm: 0.375rem;  /* 6px */
  --radius-md: 0.5rem;    /* 8px */
  --radius-lg: 0.75rem;   /* 12px */
  --radius-xl: 1rem;      /* 16px */
  --radius-2xl: 1.5rem;   /* 24px */
  --radius-full: 9999px;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  
  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-base: 300ms ease-in-out;
  --transition-slow: 500ms ease-in-out;
  
  /* Z-index */
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal: 1040;
  --z-popover: 1050;
  --z-tooltip: 1060;
}

/* ==========================================
   Reset & Base Styles
   ========================================== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--color-gray-800);
  background-color: var(--color-white);
  overflow-x: hidden;
}

/* ==========================================
   Typography
   ========================================== */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-4);
  color: var(--color-gray-900);
}

h1 { font-size: var(--font-size-5xl); }
h2 { font-size: var(--font-size-4xl); }
h3 { font-size: var(--font-size-3xl); }
h4 { font-size: var(--font-size-2xl); }
h5 { font-size: var(--font-size-xl); }
h6 { font-size: var(--font-size-lg); }

p {
  margin-bottom: var(--spacing-4);
  color: var(--color-gray-600);
}

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

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

/* ==========================================
   Layout Components
   ========================================== */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-6);
}

.section {
  padding: var(--spacing-20) 0;
}

.section-title {
  text-align: center;
  margin-bottom: var(--spacing-12);
}

.section-subtitle {
  text-align: center;
  font-size: var(--font-size-lg);
  color: var(--color-gray-600);
  max-width: 600px;
  margin: 0 auto var(--spacing-12);
}

/* ==========================================
   Header & Navigation
   ========================================== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-sm);
  z-index: var(--z-fixed);
  transition: all var(--transition-base);
}

.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-4) 0;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-3);
  font-size: var(--font-size-xl);
  font-weight: 800;
  color: var(--color-gray-900);
}

.logo img {
  height: 40px;
  width: auto;
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: var(--spacing-8);
  align-items: center;
}

.nav-link {
  font-weight: 600;
  color: var(--color-gray-700);
  transition: color var(--transition-fast);
}

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

.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: var(--font-size-2xl);
  cursor: pointer;
  color: var(--color-gray-700);
}

/* ==========================================
   Hero Section
   ========================================== */
.hero {
  min-height: calc(100dvh); /* 100vh - header height */
  display: flex;
  align-items: center;
  background: var(--gradient-hero);
  position: relative;
  overflow: hidden;
  padding: 80px 0 var(--spacing-12) 0;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('data:image/svg+xml,<svg width="100" height="100" xmlns="http://www.w3.org/2000/svg"><circle cx="50" cy="50" r="2" fill="white" opacity="0.1"/></svg>');
  opacity: 0.3;
}

.hero-content {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-12);
  align-items: center;
  color: var(--color-white);
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--spacing-4);
}

.hero-left {
  text-align: left;
}

.hero-right {
  display: flex;
  justify-content: center;
  align-items: center;
  margin-top: var(--spacing-8);
}

.hero-title {
  font-size: clamp(2rem, 5vw, 3.75rem); /* Smooth scaling */
  font-weight: 800;
  margin-bottom: var(--spacing-6);
  color: var(--color-white);
  animation: fadeInUp 1s ease-out;
  line-height: 1.5; /* Better readability for JP text */
  letter-spacing: 0.05em; /* More elegant feel */
}

.hero-subtitle {
  font-size: var(--font-size-xl);
  margin-bottom: var(--spacing-10);
  color: rgba(255, 255, 255, 0.9);
  animation: fadeInUp 1s ease-out 0.2s backwards;
  line-height: 1.8;
}

.hero-cta {
  display: flex;
  gap: var(--spacing-4);
  flex-wrap: wrap;
  animation: fadeInUp 1s ease-out 0.4s backwards;
}

.hero-image {
  animation: fadeInUp 1s ease-out 0.6s backwards;
  position: relative;
}

.hero-image img,
.hero-image video {
  max-width: 100%;
  width: auto;
  height: auto;
  min-height: 600px;
  max-height: min(700px, calc(100vh - 200px));
  object-fit: contain;

}

/* Floating animation for smartphone */
@keyframes float {
  0%, 100% {
    transform: translateY(0px);
  }
  50% {
    transform: translateY(-20px);
  }
}

/* ==========================================
   Buttons
   ========================================== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-2);
  padding: var(--spacing-4) var(--spacing-8);
  font-size: var(--font-size-base);
  font-weight: 600;
  border-radius: var(--radius-lg);
  border: none;
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
}

.btn-primary {
  background: var(--color-white);
  color: var(--color-primary);
  box-shadow: var(--shadow-lg);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-xl);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.2);
  color: var(--color-white);
  backdrop-filter: blur(10px);
  border: 2px solid rgba(255, 255, 255, 0.3);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.3);
  border-color: rgba(255, 255, 255, 0.5);
}

.app-badge {
  height: 50px;
  width: auto;
  transition: transform var(--transition-base);
}

.app-badge:hover {
  transform: scale(1.05);
}

/* ==========================================
   Feature Cards
   ========================================== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-8);
  margin-top: var(--spacing-12);
}

.feature-card {
  background: var(--color-white);
  padding: var(--spacing-8);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-base);
  opacity: 0;
  transform: translateY(30px);
}

.feature-card.visible {
  opacity: 1;
  transform: translateY(0);
  animation: fadeInUp 0.6s ease-out forwards;
}

.feature-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
}

.feature-icon {
  width: 100px;
  height: 100px;
  margin-bottom: var(--spacing-6);
  margin-left: auto;
  margin-right: auto;
  display: block;
  border-radius: var(--radius-lg);
  background: white;
  padding: var(--spacing-3);
  box-shadow: none;
}

.feature-title {
  font-size: var(--font-size-xl);
  margin-bottom: var(--spacing-3);
  color: var(--color-gray-900);
}

.feature-description {
  color: var(--color-gray-600);
  line-height: 1.7;
}

/* ==========================================
   CTA Section
   ========================================== */
.cta-section {
  background: var(--gradient-primary);
  color: var(--color-white);
  text-align: center;
  padding: var(--spacing-20) 0;
}

.cta-section h2 {
  color: var(--color-white);
  margin-bottom: var(--spacing-6);
}

.cta-section p {
  color: rgba(255, 255, 255, 0.9);
  font-size: var(--font-size-lg);
  margin-bottom: var(--spacing-10);
}

.cta-section .hero-cta {
  justify-content: center;
}

/* ==========================================
   Footer
   ========================================== */
.footer {
  background: var(--color-gray-900);
  color: var(--color-gray-400);
  padding: var(--spacing-12) 0 var(--spacing-6);
}

.footer .logo {
  color: var(--color-white);
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--spacing-6);
  margin-bottom: var(--spacing-6);
}

.footer-links {
  display: flex;
  gap: var(--spacing-6);
  list-style: none;
}

.footer-link {
  color: var(--color-gray-400);
  transition: color var(--transition-fast);
}

.footer-link:hover {
  color: var(--color-white);
}

.footer-bottom {
  text-align: center;
  padding-top: var(--spacing-6);
  border-top: 1px solid var(--color-gray-800);
  font-size: var(--font-size-sm);
}

/* ==========================================
   Privacy & Support Pages
   ========================================== */
.page-header {
  background: var(--gradient-primary);
  color: var(--color-white);
  padding: var(--spacing-24) 0 var(--spacing-12);
  margin-top: 80px;
  text-align: center;
}

.page-header h1 {
  color: var(--color-white);
}

.page-content {
  max-width: 800px;
  margin: 0 auto;
  padding: var(--spacing-12) var(--spacing-6);
}

.page-content h2 {
  margin-top: var(--spacing-10);
  margin-bottom: var(--spacing-4);
  color: var(--color-gray-900);
}

.page-content h3 {
  margin-top: var(--spacing-6);
  margin-bottom: var(--spacing-3);
  color: var(--color-gray-800);
}

.page-content ul, .page-content ol {
  margin-left: var(--spacing-6);
  margin-bottom: var(--spacing-4);
}

.page-content li {
  margin-bottom: var(--spacing-2);
  color: var(--color-gray-600);
}

/* FAQ Accordion */
.faq-item {
  background: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-lg);
  margin-bottom: var(--spacing-4);
  overflow: hidden;
}

.faq-question {
  width: 100%;
  padding: var(--spacing-5);
  background: none;
  border: none;
  text-align: left;
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--color-gray-900);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: background var(--transition-fast);
}

.faq-question:hover {
  background: var(--color-gray-50);
}

.faq-icon {
  transition: transform var(--transition-base);
}

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

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-base);
}

.faq-item.active .faq-answer {
  max-height: 1200px;
}

.faq-answer-content {
  padding: 0 var(--spacing-5) var(--spacing-5);
  color: var(--color-gray-600);
}

/* ==========================================
   Animations
   ========================================== */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

/* ==========================================
   Responsive Design
   ========================================== */

/* Tablet (769px - 1024px) */
@media (max-width: 1024px) and (min-width: 769px) {
  .hero-content {
    gap: var(--spacing-8);
    max-width: 900px;
  }
  
  .hero-image img,
  .hero-image video {
    max-height: 550px;
  }
  
  .hero-title {
    font-size: 2.5rem;
  }
  
  .hero-subtitle {
    font-size: 1.1rem;
  }
}

/* Mobile (max-width: 768px) */
@media (max-width: 768px) {
  /* Typography */
  h1 { font-size: var(--font-size-4xl); }
  h2 { font-size: var(--font-size-3xl); }
  h3 { font-size: var(--font-size-2xl); }
  
  .hero-title {
    font-size: var(--font-size-4xl);
  }
  
  .hero-subtitle {
    font-size: var(--font-size-lg);
  }
  
  /* Layout */
  .section {
    padding: var(--spacing-12) 0;
  }
  
  /* Navigation */
  .nav-menu {
    position: fixed;
    top: 70px;
    left: -100%;
    width: 100%;
    height: calc(100vh - 70px);
    background: var(--color-white);
    flex-direction: column;
    padding: var(--spacing-8);
    box-shadow: var(--shadow-lg);
    transition: left var(--transition-base);
  }
  
  .nav-menu.active {
    left: 0;
  }
  
  .mobile-menu-toggle {
    display: block;
  }
  
  /* Hero - Switch to single column */
  .hero-content {
    grid-template-columns: 1fr;
    gap: var(--spacing-8);
    text-align: center;
  }
  
  .hero {
    padding: var(--spacing-16) 0;
    min-height: auto;
  }
  
  .hero-left {
    text-align: center;
  }
  
  .hero-cta {
    justify-content: center;
  }
  
  .hero-right {
    order: -1; /* Move image above text on mobile */
    margin-top: var(--spacing-8);
  }
  
  .hero-image img,
  .hero-image video {
    max-height: 450px;
    min-height: auto;
  }
  
  .app-badge {
    height: 45px;
  }
  
  /* Features */
  .features-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-6);
  }
  
  /* EgarcReader usage grid */
  .reader-usage-grid {
    grid-template-columns: 1fr !important;
  }
  
  /* Footer */
  .footer-content {
    flex-direction: column;
    text-align: center;
  }
  
  .footer-links {
    flex-direction: column;
    gap: var(--spacing-3);
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 var(--spacing-4);
  }
  
  .hero-title {
    font-size: var(--font-size-3xl);
  }
  
  .btn {
    padding: var(--spacing-3) var(--spacing-6);
    font-size: var(--font-size-sm);
  }
}

/* ==========================================
   Utility Classes (Refactored from inline styles)
   ========================================== */

/* Step-by-step headings */
.step-heading {
  color: var(--color-primary);
  margin-top: var(--spacing-4);
  margin-bottom: var(--spacing-2);
}

/* Info box */
.info-box {
  margin-top: var(--spacing-6);
  padding: var(--spacing-4);
  background: var(--color-gray-50);
  border-radius: var(--radius-lg);
}

/* Download section */
.download-section {
  margin-top: var(--spacing-6);
  padding: var(--spacing-4);
  background: var(--gradient-primary);
  border-radius: var(--radius-lg);
  text-align: center;
}

.download-section p {
  color: white;
  margin-bottom: var(--spacing-3);
  font-weight: 600;
}

/* Reader usage card */
.reader-usage-card {
  padding: var(--spacing-4);
  background: var(--gradient-card);
  border-radius: var(--radius-lg);
}

.reader-usage-card strong {
  color: var(--color-primary);
}

.reader-usage-card p {
  font-size: var(--font-size-sm);
  color: var(--color-gray-600);
  margin-top: var(--spacing-2);
  margin-bottom: 0;
}

/* Code inline */
.code-inline {
  background: var(--color-gray-100);
  padding: 2px 6px;
  border-radius: 4px;
}

/* Hero media (for dynamically inserted images/videos) */
.hero-media {
  max-width: 100%;
  height: auto;
  max-height: 700px;
}

/* Text utilities */
.text-muted-sm {
  margin-top: var(--spacing-8);
  color: var(--color-gray-500);
  font-size: var(--font-size-sm);
}

/* Spacing utilities */
.mt-4 { margin-top: 4rem; }
.mt-2 { margin-top: 2rem; }
.mt-1 { margin-top: 1rem; }

/* EgarcReader section specific */
.reader-section-container {
  max-width: 800px;
  margin: 0 auto;
  text-align: left;
}

.reader-section-box {
  background: var(--color-white);
  padding: var(--spacing-8);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  margin-bottom: var(--spacing-6);
}

.reader-section-title {
  color: var(--color-primary);
  margin-bottom: var(--spacing-4);
}

.reader-section-text {
  color: var(--color-gray-600);
  line-height: 1.8;
  margin-bottom: var(--spacing-4);
}

.reader-usage-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-4);
  margin-bottom: var(--spacing-4);
}

.reader-steps-list {
  color: var(--color-gray-600);
  line-height: 1.8;
  padding-left: var(--spacing-6);
}

.reader-download-box {
  margin-top: var(--spacing-6);
  padding: var(--spacing-4);
  background: var(--gradient-primary);
  border-radius: var(--radius-lg);
  text-align: center;
}

.reader-download-box p {
  color: white;
  margin-bottom: var(--spacing-3);
  font-weight: 600;
}

.cta-download-box {
  margin-top: var(--spacing-8);
  padding: var(--spacing-4);
  background: rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(10px);
}

.cta-download-box p {
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: var(--spacing-3);
}

.cta-download-box .text-sm {
  color: rgba(255, 255, 255, 0.8);
  font-size: var(--font-size-sm);
  margin-top: var(--spacing-2);
  margin-bottom: 0;
}