/* ==========================================================================
   max.css: Variables, Root Resets, Typography & Color Themes
   ========================================================================== */

/* 1. Default Light Theme Variables */
:root {
  --color-scheme: light;
  
  --bg-main: #F4F7FB;
  --bg-card: #FFFFFF;
  --bg-card-hover: #FFFFFF;
  --bg-surface: #FFFFFF;
  --bg-surface-alt: #F8FAFC;
  
  /* High-Contrast Text Colors */
  --text-main: #020617;
  --text-muted: #334155;
  --text-dark: #000000;
  
  /* Enterprise Blue Palette */
  --primary: #1E40AF;
  --primary-hover: #1D4ED8;
  --accent: #2563EB;
  --accent-glow: rgba(37, 99, 235, 0.25);
  --success: #047857;
  
  --border-color: #CBD5E1;
  --border-light: #E2E8F0;
  
  /* Standard Box Shadows & Navigation */
  --shadow-sm: 0 2px 4px rgba(15, 23, 42, 0.06);
  --shadow-md: 0 4px 12px rgba(15, 23, 42, 0.1);
  --shadow-hover: 0 8px 20px rgba(15, 23, 42, 0.15);
  --shadow-3d-sm: 0 10px 25px -5px rgba(15, 23, 42, 0.08), 0 8px 10px -6px rgba(15, 23, 42, 0.04);
  --shadow-3d-hover: 0 20px 35px -5px rgba(37, 99, 235, 0.15), 0 10px 10px -5px rgba(37, 99, 235, 0.04);
  
  --nav-bg: rgba(255, 255, 255, 0.95);
  --hero-bg: radial-gradient(circle at 70% 30%, #EFF6FF 0%, #F4F7FB 70%);

  /* Typography & Layout */
  --font-heading: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-body: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --container-max: 1240px;
  --header-height: 80px;
  
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  
  --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.25s ease-in-out;
}

/* 2. Automatic OS/Browser Dark Mode Detection */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --color-scheme: dark;
    --bg-main: #0B0F17;
    --bg-card: #111827;
    --bg-card-hover: #1E293B;
    --bg-surface: #0F172A;
    --bg-surface-alt: #1E293B;
    
    --text-main: #F8FAFC;
    --text-muted: #94A3B8;
    --text-dark: #FFFFFF;
    
    --primary: #3B82F6;
    --primary-hover: #60A5FA;
    --accent: #60A5FA;
    --accent-glow: rgba(96, 165, 250, 0.3);
    --success: #10B981;
    
    --border-color: #1E293B;
    --border-light: #334155;
    
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.55);
    --shadow-hover: 0 8px 24px rgba(0, 0, 0, 0.7);
    --shadow-3d-sm: 0 10px 25px -5px rgba(0, 0, 0, 0.5);
    --shadow-3d-hover: 0 20px 35px -5px rgba(96, 165, 250, 0.2);
    
    --nav-bg: rgba(15, 23, 42, 0.95);
    --hero-bg: radial-gradient(circle at 70% 30%, #172554 0%, #0B0F17 70%);
  }
}

/* 3. Explicit Dark Theme Override */
[data-theme="dark"] {
  --color-scheme: dark;
  --bg-main: #0B0F17;
  --bg-card: #111827;
  --bg-card-hover: #1E293B;
  --bg-surface: #0F172A;
  --bg-surface-alt: #1E293B;
  
  --text-main: #F8FAFC;
  --text-muted: #94A3B8;
  --text-dark: #FFFFFF;
  
  --primary: #3B82F6;
  --primary-hover: #60A5FA;
  --accent: #60A5FA;
  --accent-glow: rgba(96, 165, 250, 0.3);
  --success: #10B981;
  
  --border-color: #1E293B;
  --border-light: #334155;
  
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.55);
  --shadow-hover: 0 8px 24px rgba(0, 0, 0, 0.7);
  --shadow-3d-sm: 0 10px 25px -5px rgba(0, 0, 0, 0.5);
  --shadow-3d-hover: 0 20px 35px -5px rgba(96, 165, 250, 0.2);
  
  --nav-bg: rgba(15, 23, 42, 0.95);
  --hero-bg: radial-gradient(circle at 70% 30%, #172554 0%, #0B0F17 70%);
}

/* 4. Explicit Light Theme Override */
[data-theme="light"] {
  --color-scheme: light;
  --bg-main: #F4F7FB;
  --bg-card: #FFFFFF;
  --bg-card-hover: #FFFFFF;
  --bg-surface: #FFFFFF;
  --bg-surface-alt: #F8FAFC;
  
  --text-main: #020617;
  --text-muted: #334155;
  --text-dark: #000000;
  
  --primary: #1E40AF;
  --primary-hover: #1D4ED8;
  --accent: #2563EB;
  --accent-glow: rgba(37, 99, 235, 0.25);
  --success: #047857;
  
  --border-color: #CBD5E1;
  --border-light: #E2E8F0;
  
  --shadow-sm: 0 2px 4px rgba(15, 23, 42, 0.06);
  --shadow-md: 0 4px 12px rgba(15, 23, 42, 0.1);
  --shadow-hover: 0 8px 20px rgba(15, 23, 42, 0.15);
  --shadow-3d-sm: 0 10px 25px -5px rgba(15, 23, 42, 0.08);
  --shadow-3d-hover: 0 20px 35px -5px rgba(37, 99, 235, 0.15);
  
  --nav-bg: rgba(255, 255, 255, 0.95);
  --hero-bg: radial-gradient(circle at 70% 30%, #EFF6FF 0%, #F4F7FB 70%);
}

*, *::before, *::after {
  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-main);
  color: var(--text-main);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

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

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

ul { 
  list-style: none; 
}

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

/* Base Layout Classes */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section-padding { 
  padding: clamp(3.5rem, 8vw, 6rem) 0; 
}

.text-gradient {
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 50%, var(--primary-hover) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

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

/* Margins */
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }
.mb-6 { margin-bottom: 3rem; }

/* Layout Grids */
.grid-2 { 
  display: grid; 
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 480px), 1fr)); 
  gap: 2.5rem; 
}

.grid-3 { 
  display: grid; 
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 320px), 1fr)); 
  gap: 2.5rem; 
}

.grid-4 { 
  display: grid; 
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 250px), 1fr)); 
  gap: 2rem; 
}

/* Theme Elements & Overrides */
.hero-wrapper {
  background: var(--hero-bg) !important;
}

.card {
  background: var(--bg-card) !important;
  border-color: var(--border-color) !important;
}

.dropdown-content {
  background-color: var(--bg-card) !important;
  border-color: var(--border-color) !important;
}

.footer {
  background-color: var(--bg-surface) !important;
  border-color: var(--border-color) !important;
}

.social-icon-btn {
  background: var(--bg-surface-alt) !important;
  border-color: var(--border-color) !important;
  color: var(--text-main) !important;
}

/* Theme Toggle Button */
.theme-toggle-btn {
  background: var(--bg-surface-alt);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.theme-toggle-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-2px);
}