/* ============================================
   eBookflip Design System v2 - Bold Modern
   ============================================ */

:root {
  /* Colors - Primary */
  --color-primary: #4f46e5;
  --color-primary-dark: #3730a3;
  --color-primary-light: #818cf8;
  --color-accent: #7c3aed;
  --color-accent-light: #a78bfa;

  /* Gradient Palette */
  --gradient-primary: linear-gradient(135deg, #4f46e5 0%, #7c3aed 50%, #ec4899 100%);
  --gradient-hero: linear-gradient(135deg, #030014 0%, #1a0a2e 35%, #16213e 70%, #0f3460 100%);
  --gradient-hero-mesh: radial-gradient(ellipse 80% 50% at 20% 40%, rgba(79, 70, 229, 0.35) 0%, transparent 50%),
    radial-gradient(ellipse 60% 40% at 80% 20%, rgba(236, 72, 153, 0.25) 0%, transparent 50%),
    radial-gradient(ellipse 50% 60% at 60% 80%, rgba(124, 58, 237, 0.2) 0%, transparent 50%);
  --gradient-dark: linear-gradient(180deg, #0f172a 0%, #1e1b4b 100%);
  --gradient-card: linear-gradient(145deg, rgba(255,255,255,0.05) 0%, rgba(255,255,255,0.02) 100%);
  --gradient-text: linear-gradient(90deg, #4f46e5 0%, #7c3aed 40%, #ec4899 100%);
  --gradient-cta: linear-gradient(135deg, #4f46e5 0%, #7c3aed 100%);
  --gradient-soft: linear-gradient(135deg, #f5f3ff 0%, #ede9fe 50%, #fce7f3 100%);

  /* Colors - Neutrals */
  --color-white: #ffffff;
  --color-gray-50: #f8fafc;
  --color-gray-100: #f1f5f9;
  --color-gray-200: #e2e8f0;
  --color-gray-300: #cbd5e1;
  --color-gray-400: #94a3b8;
  --color-gray-500: #64748b;
  --color-gray-600: #475569;
  --color-gray-700: #334155;
  --color-gray-800: #1e293b;
  --color-gray-900: #0f172a;

  /* Backgrounds */
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-dark: #0f172a;
  --bg-darker: #020617;
  --bg-glass: rgba(255, 255, 255, 0.7);
  --bg-glass-dark: rgba(15, 23, 42, 0.8);

  /* Typography */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-heading: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  /* Fluid Type Scale */
  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.8rem);
  --text-sm: clamp(0.85rem, 0.8rem + 0.25vw, 0.95rem);
  --text-base: clamp(0.95rem, 0.9rem + 0.3vw, 1.05rem);
  --text-lg: clamp(1.1rem, 1rem + 0.5vw, 1.25rem);
  --text-xl: clamp(1.25rem, 1.1rem + 0.75vw, 1.5rem);
  --text-2xl: clamp(1.5rem, 1.25rem + 1.25vw, 2rem);
  --text-3xl: clamp(2rem, 1.5rem + 2.5vw, 3rem);
  --text-4xl: clamp(2.5rem, 1.8rem + 3.5vw, 4rem);
  --text-5xl: clamp(3rem, 2rem + 5vw, 5rem);

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;

  /* Borders */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --radius-2xl: 28px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.12);
  --shadow-xl: 0 24px 60px rgba(0,0,0,0.15);
  --shadow-glow: 0 0 40px rgba(79,70,229,0.3);
  --shadow-glow-sm: 0 0 20px rgba(79,70,229,0.15);
  --shadow-colored: 0 20px 60px -15px rgba(79,70,229,0.4);

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-spring: 500ms cubic-bezier(0.34, 1.56, 0.64, 1);

  /* Layout */
  --container-max: 1200px;
  --container-wide: 1400px;
  --header-height: 80px;
}

/* ============================================
   Modern CSS Reset
   ============================================ */

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

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-primary);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--color-gray-800);
  background-color: var(--bg-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

input, button, textarea, select {
  font: inherit;
}

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

ul, ol {
  list-style: none;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 800;
  line-height: 1.1;
  color: var(--color-gray-900);
  letter-spacing: -0.03em;
}

p {
  line-height: 1.7;
  color: var(--color-gray-600);
}

/* ============================================
   Gradient Text
   ============================================ */

.gradient-text {
  background: var(--gradient-text);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  font-weight: 800;
}

/* ============================================
   Glass Morphism
   ============================================ */

.glass {
  background: rgba(255, 255, 255, 0.6);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.3);
}

.glass-dark {
  background: rgba(15, 23, 42, 0.7);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

/* ============================================
   Animations
   ============================================ */

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(40px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

@keyframes shimmer {
  0% { background-position: -200% center; }
  100% { background-position: 200% center; }
}

@keyframes pulse-glow {
  0%, 100% { box-shadow: 0 0 20px rgba(79,70,229,0.2); }
  50% { box-shadow: 0 0 40px rgba(79,70,229,0.4); }
}

@keyframes gradient-move {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

.animate-fade-in-up {
  animation: fadeInUp 0.8s ease forwards;
}

.animate-float {
  animation: float 6s ease-in-out infinite;
}

/* ============================================
   Buttons
   ============================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 32px;
  font-family: var(--font-primary);
  font-size: var(--text-sm);
  font-weight: 700;
  border-radius: var(--radius-full);
  border: none;
  cursor: pointer;
  transition: all var(--transition-base);
  white-space: nowrap;
  text-decoration: none;
  letter-spacing: -0.01em;
  position: relative;
  overflow: hidden;
}

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

.btn-primary:hover {
  transform: translateY(-2px) scale(1.02);
  box-shadow: 0 25px 70px -15px rgba(79,70,229,0.5);
  color: var(--color-white);
}

.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}

.btn-outline:hover {
  background: var(--color-primary);
  color: var(--color-white);
  transform: translateY(-2px);
  box-shadow: var(--shadow-colored);
}

/* ============================================
   Section Utilities
   ============================================ */

.section {
  padding: var(--space-24) 0;
  position: relative;
}

.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-6);
}