/* ==========================================================================
   iLoveMarks - Core Design System & Base Styling
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Outfit:wght@500;600;700;800&family=JetBrains+Mono:wght@400;600&display=swap');

:root {
  /* Color Palette - Light Theme */
  --bg-main: #f8fafc;
  --bg-surface: #ffffff;
  --bg-surface-glass: rgba(255, 255, 255, 0.85);
  --bg-card: #ffffff;
  --bg-card-hover: #f8fafc;
  --bg-subtle: #f1f5f9;
  --bg-active: #e2e8f0;

  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --text-inverse: #ffffff;

  --border-light: #e2e8f0;
  --border-focus: #6366f1;
  --border-glass: rgba(255, 255, 255, 0.6);

  /* Primary Brand Gradients */
  --primary: #4f46e5;
  --primary-hover: #4338ca;
  --primary-light: #eef2ff;
  --primary-gradient: linear-gradient(135deg, #4f46e5 0%, #7c3aed 50%, #9333ea 100%);
  --primary-glow: rgba(99, 102, 241, 0.25);

  /* Secondary & Accent Colors */
  --accent-cyan: #06b6d4;
  --accent-emerald: #10b981;
  --accent-amber: #f59e0b;
  --accent-rose: #f43f5e;
  --accent-violet: #8b5cf6;

  /* Elevation Shadows */
  --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-sm: 0 2px 8px -2px rgba(15, 23, 42, 0.08);
  --shadow-md: 0 8px 24px -4px rgba(15, 23, 42, 0.1);
  --shadow-lg: 0 16px 36px -6px rgba(15, 23, 42, 0.12);
  --shadow-glow: 0 0 35px var(--primary-glow);

  /* Typography */
  --font-heading: 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  /* Layout & Sizing */
  --max-width: 1280px;
  --header-height: 74px;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

[data-theme="dark"] {
  /* Dark Theme Tokens */
  --bg-main: #090d16;
  --bg-surface: #0f172a;
  --bg-surface-glass: rgba(15, 23, 42, 0.88);
  --bg-card: #111a2e;
  --bg-card-hover: #19243d;
  --bg-subtle: #1e293b;
  --bg-active: #334155;

  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-inverse: #0f172a;

  --border-light: rgba(255, 255, 255, 0.09);
  --border-focus: #818cf8;
  --border-glass: rgba(255, 255, 255, 0.1);

  --primary: #6366f1;
  --primary-hover: #818cf8;
  --primary-light: rgba(99, 102, 241, 0.18);
  --primary-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #a855f7 100%);
  --primary-glow: rgba(99, 102, 241, 0.35);

  --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.4);
  --shadow-sm: 0 2px 8px -2px rgba(0, 0, 0, 0.5);
  --shadow-md: 0 8px 24px -4px rgba(0, 0, 0, 0.6);
  --shadow-lg: 0 16px 36px -6px rgba(0, 0, 0, 0.7);
}

/* Base Resets */
*, *::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(--bg-main);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* Background Animated Gradient Mesh */
.bg-mesh {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: -1;
  pointer-events: none;
  background: 
    radial-gradient(circle at 10% 20%, rgba(99, 102, 241, 0.08) 0%, transparent 45%),
    radial-gradient(circle at 90% 80%, rgba(139, 92, 246, 0.08) 0%, transparent 45%),
    radial-gradient(circle at 50% 50%, rgba(6, 182, 212, 0.04) 0%, transparent 50%);
}

[data-theme="dark"] .bg-mesh {
  background: 
    radial-gradient(circle at 15% 15%, rgba(99, 102, 241, 0.14) 0%, transparent 45%),
    radial-gradient(circle at 85% 85%, rgba(168, 85, 247, 0.12) 0%, transparent 45%),
    radial-gradient(circle at 50% 50%, rgba(6, 182, 212, 0.07) 0%, transparent 50%);
}

/* Typography Utilities */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  color: var(--text-primary);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.02em;
}

h1 { font-size: clamp(2.2rem, 4vw + 1rem, 3.25rem); }
h2 { font-size: clamp(1.6rem, 2.5vw + 0.8rem, 2.25rem); }
h3 { font-size: clamp(1.25rem, 1.5vw + 0.6rem, 1.5rem); }
h4 { font-size: 1.15rem; }

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

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

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

.gradient-text {
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

/* Container */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 0.7rem 1.4rem;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition-normal);
  text-decoration: none;
  user-select: none;
}

.btn-primary {
  background: var(--primary-gradient);
  color: #ffffff !important;
  box-shadow: 0 4px 15px var(--primary-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px var(--primary-glow);
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text-primary);
  border-color: var(--border-light);
}

.btn-secondary:hover {
  background: var(--bg-card-hover);
  border-color: var(--primary);
  transform: translateY(-2px);
}

.btn-sm {
  padding: 0.4rem 0.85rem;
  font-size: 0.85rem;
  border-radius: var(--radius-sm);
}

.btn-icon {
  width: 42px;
  height: 42px;
  padding: 0;
  border-radius: var(--radius-md);
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  color: var(--text-primary);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-icon:hover {
  background: var(--bg-subtle);
  color: var(--primary);
  border-color: var(--border-focus);
}

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.25rem 0.65rem;
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.badge-primary { background: var(--primary-light); color: var(--primary); }
.badge-cyan { background: rgba(6, 182, 212, 0.12); color: var(--accent-cyan); }
.badge-emerald { background: rgba(16, 185, 129, 0.12); color: var(--accent-emerald); }
.badge-amber { background: rgba(245, 158, 11, 0.12); color: var(--accent-amber); }
.badge-violet { background: rgba(139, 92, 246, 0.12); color: var(--accent-violet); }
.badge-rose { background: rgba(244, 63, 94, 0.12); color: var(--accent-rose); }