/* ==========================================================================
   M90 TECHNOLOGIES — DESIGN SYSTEM & TOKENS
   "Built on Engineering, Run on Technology"
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:ital,wght@0,300;0,400;0,500;0,600;0,700;0,800;1,400;1,600&family=Space+Grotesk:wght@500;600;700&family=JetBrains+Mono:wght@400;500;600&display=swap');

:root {
  /* Brand Core Colors */
  --brand-navy-950: #050B14;
  --brand-navy-900: #0B132B;
  --brand-navy-800: #141E3C;
  --brand-navy-700: #1C2B54;
  --brand-navy-600: #273A70;
  
  --brand-blue-600: #0052CC;
  --brand-blue-500: #0066FF;
  --brand-blue-400: #3385FF;
  --brand-blue-300: #70A9FF;
  --brand-blue-100: #E6F0FF;
  --brand-blue-50:  #F0F6FF;

  --brand-cyan-500: #06B6D4;
  --brand-cyan-400: #22D3EE;
  --brand-emerald-500: #10B981;
  --brand-amber-500: #F59E0B;

  /* Typography */
  --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-display: var(--font-sans);
  --font-mono: var(--font-sans);

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: 400ms cubic-bezier(0.16, 1, 0.3, 1);
  --transition-bounce: 500ms cubic-bezier(0.34, 1.56, 0.64, 1);

  /* Border Radii */
  --radius-xs: 4px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-2xl: 32px;
  --radius-full: 9999px;

  /* Container */
  --max-width: 1280px;
  --header-height: 68px;
}

/* Light Mode (Default) */
[data-theme="light"], :root:not([data-theme="dark"]) {
  --bg-page: #F8FAFC;
  --bg-page-gradient: radial-gradient(circle at 10% 20%, rgba(0, 102, 255, 0.04) 0%, transparent 40%),
                      radial-gradient(circle at 90% 80%, rgba(6, 182, 212, 0.04) 0%, transparent 40%),
                      #F8FAFC;
  --bg-card: #FFFFFF;
  --bg-card-subtle: #F1F5F9;
  --bg-card-hover: #FFFFFF;
  --bg-header: rgba(248, 250, 252, 0.88);
  --bg-header-solid: #FFFFFF;
  --bg-elevated: #FFFFFF;
  --bg-tag: #EEF4FF;

  --border-subtle: #E2E8F0;
  --border-strong: #CBD5E1;
  --border-glow: rgba(0, 102, 255, 0.2);

  --text-primary: #0B132B;
  --text-secondary: #475569;
  --text-muted: #64748B;
  --text-inverse: #FFFFFF;
  --text-link: #0066FF;

  --accent-primary: #0066FF;
  --accent-primary-hover: #0052CC;
  --accent-gradient: linear-gradient(135deg, #0066FF 0%, #00C6FF 100%);
  --accent-glow: rgba(0, 102, 255, 0.15);

  --shadow-sm: 0 1px 3px rgba(11, 19, 43, 0.05), 0 1px 2px rgba(11, 19, 43, 0.03);
  --shadow-md: 0 4px 12px rgba(11, 19, 43, 0.06), 0 2px 4px rgba(11, 19, 43, 0.04);
  --shadow-lg: 0 12px 30px rgba(11, 19, 43, 0.08), 0 4px 8px rgba(11, 19, 43, 0.03);
  --shadow-xl: 0 20px 40px rgba(11, 19, 43, 0.12), 0 8px 16px rgba(11, 19, 43, 0.04);
  --shadow-glow: 0 0 35px rgba(0, 102, 255, 0.2);

  --code-bg: #F1F5F9;
  --hero-mesh: radial-gradient(at 0% 0%, rgba(0, 102, 255, 0.08) 0px, transparent 50%),
               radial-gradient(at 100% 0%, rgba(6, 182, 212, 0.08) 0px, transparent 50%),
               radial-gradient(at 50% 100%, rgba(39, 58, 112, 0.05) 0px, transparent 60%);
}

/* Dark Mode (High Tech & Corporate Cyber) */
[data-theme="dark"] {
  --bg-page: #060B14;
  --bg-page-gradient: radial-gradient(circle at 10% 20%, rgba(0, 102, 255, 0.12) 0%, transparent 45%),
                      radial-gradient(circle at 90% 80%, rgba(6, 182, 212, 0.09) 0%, transparent 45%),
                      #060B14;
  --bg-card: #0D1627;
  --bg-card-subtle: #121E36;
  --bg-card-hover: #162442;
  --bg-header: rgba(6, 11, 20, 0.88);
  --bg-header-solid: #0A111E;
  --bg-elevated: #162442;
  --bg-tag: rgba(0, 102, 255, 0.18);

  --border-subtle: #1E2D4A;
  --border-strong: #2A3F66;
  --border-glow: rgba(0, 102, 255, 0.4);

  --text-primary: #F8FAFC;
  --text-secondary: #CBD5E1;
  --text-muted: #94A3B8;
  --text-inverse: #060B14;
  --text-link: #3385FF;

  --accent-primary: #0066FF;
  --accent-primary-hover: #3385FF;
  --accent-gradient: linear-gradient(135deg, #0066FF 0%, #00F0FF 100%);
  --accent-glow: rgba(0, 102, 255, 0.35);

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 4px 14px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 12px 35px rgba(0, 0, 0, 0.6);
  --shadow-xl: 0 24px 50px rgba(0, 0, 0, 0.75);
  --shadow-glow: 0 0 40px rgba(0, 102, 255, 0.4);

  --code-bg: #0A111E;
  --hero-mesh: radial-gradient(at 0% 0%, rgba(0, 102, 255, 0.22) 0px, transparent 60%),
               radial-gradient(at 100% 20%, rgba(6, 182, 212, 0.18) 0px, transparent 55%),
               radial-gradient(at 50% 100%, rgba(37, 99, 235, 0.15) 0px, transparent 70%);
}

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

html {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  background-color: var(--bg-page);
  background-image: var(--bg-page-gradient);
  background-attachment: fixed;
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background-color var(--transition-base), color var(--transition-base);
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  color: var(--text-primary);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.025em;
}

h1 { font-size: clamp(2.25rem, 5vw, 3.75rem); }
h2 { font-size: clamp(1.85rem, 3.5vw, 2.75rem); }
h3 { font-size: clamp(1.35rem, 2.2vw, 1.85rem); }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.1rem; }
h6 { font-size: 0.95rem; }

p {
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

p:last-child {
  margin-bottom: 0;
}

a {
  color: var(--text-link);
  text-decoration: none;
  transition: color var(--transition-fast), opacity var(--transition-fast);
}

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

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

button, input, select, textarea {
  font-family: inherit;
  font-size: 1rem;
}

ul, ol {
  list-style: none;
}

::selection {
  background: var(--brand-blue-500);
  color: #FFFFFF;
}

/* Accessibility */
.skip-link {
  position: absolute;
  top: -100px;
  left: 20px;
  background: var(--accent-primary);
  color: #FFFFFF;
  padding: 10px 18px;
  z-index: 9999;
  border-radius: var(--radius-sm);
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 20px;
}

/* Focus styles */
:focus-visible {
  outline: 2px solid var(--accent-primary);
  outline-offset: 3px;
}