/* ==========================================================================
   FocusReader - Stylesheet
   Design System: Modern Minimalist & Focus-driven
   ========================================================================== */

:root {
  /* Color Palette */
  --color-bg: #FAF9F6;
  --color-bg-alt: #F3F1EC;
  --color-card-bg: #FFFFFF;
  --color-text-primary: #1E293B;
  --color-text-secondary: #64748B;
  --color-text-muted: #94A3B8;
  
  --color-primary: #4F46E5;
  --color-primary-hover: #4338CA;
  --color-primary-light: #EEF2FF;
  
  --color-accent: #0EA5E9;
  --color-accent-light: #F0F9FF;
  
  --color-border: #E2E8F0;
  --color-border-subtle: #F1F5F9;
  
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.06), 0 4px 6px -2px rgba(0, 0, 0, 0.03);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.08), 0 10px 10px -5px rgba(0, 0, 0, 0.02);
  
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-full: 9999px;

  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Base resets */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--color-bg);
  color: var(--color-text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: inherit;
  text-decoration: none;
}

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

.container {
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Header & Nav */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(250, 249, 246, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: all var(--transition-fast);
}

.header.scrolled {
  border-bottom-color: var(--color-border);
  box-shadow: var(--shadow-sm);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--color-text-primary);
  transition: opacity var(--transition-fast);
}

.nav-logo:hover {
  opacity: 0.9;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

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

.nav-btn {
  padding: 10px 20px;
  border-radius: var(--radius-full);
  background: var(--color-primary);
  color: white !important;
  font-weight: 600;
  transition: background var(--transition-fast), transform var(--transition-fast);
}

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

/* Language Selector */
.lang-selector {
  position: relative;
}

.lang-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  background: var(--color-card-bg);
  transition: all var(--transition-fast);
}

.lang-btn:hover {
  border-color: var(--color-text-muted);
  color: var(--color-text-primary);
}

.lang-btn svg {
  width: 16px;
  height: 16px;
}

.lang-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  min-width: 140px;
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  padding: 6px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: all var(--transition-fast);
}

.lang-selector.open .lang-dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.lang-option {
  width: 100%;
  text-align: left;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  transition: background var(--transition-fast);
}

.lang-option:hover, .lang-option.active {
  background: var(--color-primary-light);
  color: var(--color-primary);
  font-weight: 600;
}

/* Mobile menu button */
.mobile-menu-btn {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
}

.mobile-menu-btn span {
  width: 22px;
  height: 2px;
  background: var(--color-text-primary);
  transition: all var(--transition-fast);
}

/* Hero Section */
.hero {
  position: relative;
  padding: 160px 0 100px;
  overflow: hidden;
  background: radial-gradient(circle at 50% 0%, rgba(79, 70, 229, 0.06) 0%, transparent 70%);
}

.hero-ambient-glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  pointer-events: none;
  z-index: 0;
  opacity: 0.6;
}

.glow-1 {
  top: -100px;
  right: -50px;
  width: 400px;
  height: 400px;
  background: rgba(79, 70, 229, 0.15);
}

.glow-2 {
  top: 200px;
  left: -100px;
  width: 350px;
  height: 350px;
  background: rgba(14, 165, 233, 0.12);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1.05fr;
  gap: 60px;
  align-items: center;
  position: relative;
  z-index: 1;
}

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

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: var(--radius-full);
  background: var(--color-primary-light);
  color: var(--color-primary);
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 24px;
  border: 1px solid rgba(79, 70, 229, 0.15);
}

.hero-title {
  font-size: 3rem;
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--color-text-primary);
  margin-bottom: 24px;
}

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--color-text-secondary);
  margin-bottom: 40px;
  line-height: 1.7;
}

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

/* Hero Image & SVG Mockup */
.hero-image {
  display: flex;
  justify-content: center;
  align-items: center;
}

.mockup-wrapper {
  position: relative;
  animation: floatMockup 6s ease-in-out infinite;
}

@keyframes floatMockup {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}

.phone-svg {
  filter: drop-shadow(0 25px 35px rgba(15, 23, 42, 0.15));
}

.floating-badge {
  position: absolute;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 18px;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(12px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  z-index: 10;
  transition: transform 0.3s ease;
}

.floating-badge:hover {
  transform: scale(1.04);
}

.badge-1 {
  top: 18%;
  left: -40px;
}

.badge-2 {
  bottom: 20%;
  right: -30px;
}

.badge-icon {
  font-size: 1.4rem;
}

.badge-text {
  display: flex;
  flex-direction: column;
  text-align: left;
}

.badge-text strong {
  font-size: 0.875rem;
  color: var(--color-text-primary);
  font-weight: 700;
}

.badge-text span {
  font-size: 0.75rem;
  color: var(--color-text-secondary);
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: var(--radius-full);
  background: var(--color-primary);
  color: white;
  font-size: 1rem;
  font-weight: 600;
  box-shadow: 0 4px 14px rgba(79, 70, 229, 0.3);
  transition: all var(--transition-normal);
}

.btn-primary:hover {
  background: var(--color-primary-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(79, 70, 229, 0.4);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: var(--radius-full);
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  color: var(--color-text-primary);
  font-size: 1rem;
  font-weight: 600;
  transition: all var(--transition-normal);
}

.btn-secondary:hover {
  border-color: var(--color-text-muted);
  transform: translateY(-2px);
  background: #FFF;
}

/* Features Section */
.section {
  padding: 100px 0;
}

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

.section-header {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 64px;
}

.section-title {
  font-size: 2.25rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin-bottom: 16px;
}

.section-subtitle {
  font-size: 1.1rem;
  color: var(--color-text-secondary);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.feature-card {
  background: var(--color-card-bg);
  border-radius: var(--radius-lg);
  padding: 40px;
  border: 1px solid var(--color-border-subtle);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
}

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

.feature-tag {
  display: inline-block;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 12px;
}

.feature-card h3 {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.feature-card p {
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* Why Choose Section */
.why-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.why-card {
  background: var(--color-card-bg);
  padding: 32px;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
}

.why-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.why-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: var(--color-primary-light);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 20px;
}

.why-card h4 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.why-card p {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  line-height: 1.65;
}

/* CTA Section */
.cta-section {
  padding: 100px 0;
  text-align: center;
}

.cta-box {
  background: linear-gradient(135deg, #1E1B4B 0%, #312E81 100%);
  color: white;
  border-radius: var(--radius-lg);
  padding: 80px 40px;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-xl);
}

.cta-box h2 {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 16px;
}

.cta-box p {
  font-size: 1.15rem;
  color: #C7D2FE;
  margin-bottom: 40px;
}

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

.btn-store {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 28px;
  border-radius: var(--radius-full);
  background: white;
  color: var(--color-text-primary);
  font-weight: 600;
  transition: all var(--transition-normal);
}

.btn-store:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
}

/* Legal Pages */
.legal-content {
  padding: 140px 0 80px;
}

.legal-box {
  background: var(--color-card-bg);
  border-radius: var(--radius-lg);
  padding: 56px;
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}

.legal-header {
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 24px;
  margin-bottom: 32px;
}

.legal-header h1 {
  font-size: 2.25rem;
  font-weight: 800;
  margin-bottom: 8px;
}

.legal-header p {
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

.legal-body section {
  margin-bottom: 32px;
}

.legal-body h2 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--color-text-primary);
}

.legal-body p {
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* Footer */
.footer {
  background: #0F172A;
  color: #94A3B8;
  padding: 64px 0 32px;
  border-top: 1px solid #1E293B;
}

.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 48px;
  flex-wrap: wrap;
  gap: 32px;
}

.footer-brand {
  max-width: 320px;
}

.footer-brand-title {
  color: white;
  font-size: 1.25rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}

.footer-links {
  display: flex;
  gap: 32px;
}

.footer-link {
  color: #94A3B8;
  transition: color var(--transition-fast);
}

.footer-link:hover {
  color: white;
}

.footer-bottom {
  border-top: 1px solid #1E293B;
  padding-top: 32px;
  text-align: center;
  font-size: 0.875rem;
}

/* Animations */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-on-scroll.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Responsive */
@media (max-width: 900px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

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

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

  .badge-1 {
    top: 5%;
    left: -10px;
  }

  .badge-2 {
    bottom: 5%;
    right: -10px;
  }

  .features-grid, .why-grid {
    grid-template-columns: 1fr;
  }
  
  .hero-title {
    font-size: 2.25rem;
  }
  
  .nav-links {
    position: fixed;
    top: 76px;
    left: 0;
    right: 0;
    background: var(--color-card-bg);
    flex-direction: column;
    padding: 24px;
    border-bottom: 1px solid var(--color-border);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-fast);
  }
  
  .nav-links.active {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }
  
  .mobile-menu-btn {
    display: flex;
  }
}