/* ==========================================================================
   CSS VARIABLES, RESETS & UTILITIES
   Theme: Vibrant Tech Blue & Crisp White
   ========================================================================== */

:root {
  /* Color Palette - Blue & White */
  --primary-dark: #0F172A;
  --primary-navy: #1E3A8A;
  --primary-blue: #2563EB;
  --primary-light: #3B82F6;
  --accent-cyan: #06B6D4;
  --accent-sky: #38BDF8;

  --bg-main: #F8FAFC;
  --bg-surface: #FFFFFF;
  --bg-subtle: #F1F5F9;
  --bg-ice: #EFF6FF;

  --text-main: #0F172A;
  --text-body: #334155;
  --text-muted: #64748B;
  --text-light: #94A3B8;
  --text-white: #FFFFFF;

  --border-light: #E2E8F0;
  --border-blue: #BFDBFE;
  --border-accent: #93C5FD;

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(37, 99, 235, 0.06);
  --shadow-md: 0 8px 24px rgba(37, 99, 235, 0.08);
  --shadow-lg: 0 16px 36px rgba(15, 23, 42, 0.12);
  --shadow-glow: 0 0 25px rgba(37, 99, 235, 0.25);

  /* Radii & Transitions */
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 24px;
  --radius-full: 9999px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-fast: all 0.15s ease;
  
  /* Layout */
  --container-width: 1240px;
  --navbar-height: 80px;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: 'Poppins', 'Outfit', system-ui, -apple-system, sans-serif;
  background-color: var(--bg-main);
  color: var(--text-body);
  line-height: 1.6;
  overflow-x: hidden;
}

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

ul {
  list-style: none;
}

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

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

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

.section {
  padding: 6rem 0;
  position: relative;
}

.section-bg-alt {
  background-color: var(--bg-ice);
  background-image: radial-gradient(circle at 10% 20%, rgba(219, 234, 254, 0.5) 0%, transparent 40%);
}

.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 3.5rem auto;
}

.badge-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 1.1rem;
  background: rgba(37, 99, 235, 0.1);
  border: 1px solid var(--border-accent);
  color: var(--primary-blue);
  font-size: 0.85rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  margin-bottom: 1rem;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.section-title {
  font-family: 'Outfit', sans-serif;
  font-size: 2.4rem;
  font-weight: 800;
  color: var(--primary-dark);
  line-height: 1.25;
  margin-bottom: 1rem;
}

.section-title span {
  background: linear-gradient(135deg, var(--primary-navy), var(--primary-blue), var(--accent-cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.section-subtitle {
  color: var(--text-muted);
  font-size: 1.05rem;
  font-weight: 400;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  padding: 0.85rem 1.8rem;
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  border: 2px solid transparent;
  transition: var(--transition);
  box-shadow: var(--shadow-sm);
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary-navy) 0%, var(--primary-blue) 100%);
  color: var(--text-white);
}

.btn-primary:hover {
  background: linear-gradient(135deg, var(--primary-blue) 0%, var(--accent-cyan) 100%);
  box-shadow: var(--shadow-glow);
  transform: translateY(-2px);
}

.btn-outline {
  background: var(--bg-surface);
  color: var(--primary-blue);
  border-color: var(--primary-blue);
}

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

.img-placeholder {
  width: 100%;
  height: 100%;
  min-height: 200px;
  background: linear-gradient(135deg, #EFF6FF 0%, #DBEAFE 100%);
  border: 2px dashed var(--border-accent);
  border-radius: var(--radius-md);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  text-align: center;
  color: var(--primary-blue);
  transition: var(--transition);
}

.img-placeholder i {
  font-size: 2.8rem;
  margin-bottom: 0.75rem;
  color: var(--primary-light);
}

.img-placeholder p {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--primary-navy);
}

.img-placeholder span {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

.img-placeholder:hover {
  border-color: var(--primary-blue);
  background: linear-gradient(135deg, #DBEAFE 0%, #BFDBFE 100%);
}