/* ============================================
   AlgoTech IT — Global Styles
   Dark Theme | Navy + Electric Blue
   ============================================ */

/* ---------- Google Fonts ---------- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&display=swap');

/* ---------- CSS Variables ---------- */
:root {
  /* Colors */
  --bg-primary: #0a0e1a;
  --bg-secondary: #111827;
  --bg-tertiary: #1a2035;
  --bg-card: #0f1629;
  --bg-card-hover: #141c33;
  --accent-primary: #2563eb;
  --accent-glow: #3b82f6;
  --accent-cyan: #06b6d4;
  --accent-gradient: linear-gradient(135deg, #2563eb, #06b6d4);
  --accent-gradient-hover: linear-gradient(135deg, #3b82f6, #22d3ee);
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --border-color: #1e293b;
  --border-hover: #2563eb;

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

  /* Spacing */
  --section-padding: 100px 0;
  --container-max: 1200px;
  --container-padding: 0 24px;

  /* Border Radius */
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-full: 50%;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 30px rgba(37, 99, 235, 0.15);

  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.5s ease;
}

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

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

body {
  font-family: var(--font-family);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

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

ul, ol {
  list-style: none;
}

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

/* ---------- Container ---------- */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: var(--container-padding);
}

/* ---------- Section ---------- */
.section {
  padding: var(--section-padding);
}

.section-header {
  text-align: center;
  margin-bottom: 60px;
}

.section-header h2 {
  font-size: 2.25rem;
  font-weight: 800;
  margin-bottom: 16px;
  color: var(--text-primary);
}

.section-header p {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

.section-header .accent-line {
  display: block;
  width: 60px;
  height: 3px;
  background: var(--accent-gradient);
  margin: 20px auto 0;
  border-radius: 2px;
}

/* ---------- Grid System ---------- */
.grid {
  display: grid;
  gap: 30px;
}

.grid-2 {
  grid-template-columns: repeat(2, 1fr);
}

.grid-3 {
  grid-template-columns: repeat(3, 1fr);
}

.grid-4 {
  grid-template-columns: repeat(4, 1fr);
}

/* ---------- Typography ---------- */
h1, h2, h3, h4, h5, h6 {
  line-height: 1.3;
  color: var(--text-primary);
}

h1 { font-size: 3.5rem; font-weight: 900; }
h2 { font-size: 2.25rem; font-weight: 800; }
h3 { font-size: 1.5rem; font-weight: 700; }
h4 { font-size: 1.25rem; font-weight: 600; }

p {
  color: var(--text-secondary);
  line-height: 1.8;
}

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

/* ---------- Background Patterns ---------- */
.bg-secondary {
  background-color: var(--bg-secondary);
}

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

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
  h1 { font-size: 2.75rem; }
  h2 { font-size: 2rem; }
}

@media (max-width: 768px) {
  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }
  
  h1 { font-size: 2.25rem; }
  h2 { font-size: 1.75rem; }
  h3 { font-size: 1.25rem; }

  .section {
    padding: 60px 0;
  }

  .section-header {
    margin-bottom: 40px;
  }

  .section-header h2 {
    font-size: 1.75rem;
  }
}

@media (max-width: 480px) {
  h1 { font-size: 1.85rem; }
  .container {
    padding: 0 16px;
  }
}