/* ==========================================================================
   LinkLingo - Educational Architecture Design System
   Color Palette strictly adhering to official logo identity specs:
   - Deep Navy: #06132B / #0B1E42
   - Electric Blue: #0072FF / #0052D4
   - Mint / Emerald: #00C897 / #00E676
   - Warm Orange: #FF5200 / #FF7A00
   ========================================================================== */

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

:root {
  /* Brand Core Color Tokens derived from Logo */
  --navy-dark: #06132B;          /* Logo Text Base / Header Deep Dark */
  --navy-primary: #0B1E42;       /* Corporate Blue Dark Surface */
  --blue-electric: #0072FF;      /* Logo Gradient Blue */
  --blue-cyan: #00D2FF;          /* Bright Cyan Glow Accent */
  --mint-teal: #00C897;          /* Logo Mint/Teal Progress */
  --mint-bright: #00E676;        /* Bright Mint Highlight */
  --orange-warm: #FF5200;        /* Logo Warm Orange Primary CTA */
  --orange-bright: #FF7A00;      /* Vibrant Orange Hover */

  /* Gradient Compositions */
  --grad-navy: linear-gradient(135deg, #06132B 0%, #0B1E42 100%);
  --grad-blue: linear-gradient(135deg, #0052D4 0%, #0072FF 60%, #00D2FF 100%);
  --grad-mint: linear-gradient(135deg, #00C897 0%, #00E676 100%);
  --grad-orange: linear-gradient(135deg, #FF5200 0%, #FF7A00 100%);
  --grad-hero-glow: radial-gradient(80% 50% at 50% 0%, rgba(0, 114, 255, 0.12) 0%, rgba(0, 200, 151, 0.06) 50%, rgba(255, 255, 255, 0) 100%);
  --grad-card-border: linear-gradient(135deg, rgba(0, 114, 255, 0.25) 0%, rgba(0, 200, 151, 0.2) 50%, rgba(255, 82, 0, 0.2) 100%);
  --grad-dark-surface: linear-gradient(145deg, #06132B 0%, #0F254E 100%);

  /* Neutral Surface Palette (Light & Crisp EdTech Theme) */
  --bg-body: #F8FAFC;
  --bg-white: #FFFFFF;
  --bg-subtle: #F1F5F9;
  --bg-card: #FFFFFF;
  --bg-glass: rgba(255, 255, 255, 0.92);
  --bg-dark-glass: rgba(6, 19, 43, 0.94);

  /* Typography Colors */
  --text-dark: #06132B;
  --text-body: #334155;
  --text-muted: #64748B;
  --text-light: #94A3B8;
  --text-white: #FFFFFF;

  /* Typography Stack */
  --font-heading: 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

  /* Elevation & Shadows */
  --shadow-xs: 0 2px 6px rgba(6, 19, 43, 0.04);
  --shadow-sm: 0 4px 16px rgba(6, 19, 43, 0.06);
  --shadow-md: 0 12px 32px rgba(6, 19, 43, 0.08);
  --shadow-lg: 0 24px 60px rgba(6, 19, 43, 0.12);
  --shadow-blue: 0 12px 36px rgba(0, 114, 255, 0.25);
  --shadow-orange: 0 12px 36px rgba(255, 82, 0, 0.3);
  --shadow-mint: 0 12px 36px rgba(0, 200, 151, 0.25);

  /* Borders & Radius */
  --border-subtle: rgba(6, 19, 43, 0.08);
  --border-bright: rgba(0, 114, 255, 0.2);
  --border-orange: rgba(255, 82, 0, 0.25);
  --radius-xs: 6px;
  --radius-sm: 12px;
  --radius-md: 20px;
  --radius-lg: 32px;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-normal: all 0.35s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-slow: all 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Reset & Global Foundation */
*, *::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);
  color: var(--text-body);
  background-color: var(--bg-body);
  line-height: 1.6;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  color: var(--text-dark);
  font-weight: 700;
  line-height: 1.18;
  letter-spacing: -0.025em;
}

p {
  margin-bottom: 1rem;
}

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

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

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

ul {
  list-style: none;
}

/* Layout Utilities */
.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section-padding {
  padding: 6rem 0;
}

.section-padding-sm {
  padding: 4rem 0;
}

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

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

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

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

/* Section Header Component */
.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 1.1rem;
  background: rgba(0, 114, 255, 0.08);
  border: 1px solid rgba(0, 114, 255, 0.2);
  border-radius: var(--radius-full);
  color: var(--navy-dark);
  font-family: var(--font-heading);
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 1.25rem;
}

.section-tag i {
  color: var(--blue-electric);
}

.section-title {
  font-size: 2.4rem;
  font-weight: 800;
  color: var(--text-dark);
  margin-bottom: 1.25rem;
}

@media (min-width: 992px) {
  .section-title {
    font-size: 3.1rem;
  }
}

.section-subtitle {
  font-size: 1.125rem;
  color: var(--text-muted);
  max-width: 720px;
  margin: 0 auto 3rem auto;
  line-height: 1.7;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.65rem;
  padding: 0.95rem 1.85rem;
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 700;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: var(--transition-normal);
  border: none;
  outline: none;
  white-space: nowrap;
  position: relative;
  overflow: hidden;
  text-decoration: none;
}

.btn-primary {
  background: var(--grad-orange);
  color: #FFFFFF;
  box-shadow: var(--shadow-orange);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 16px 40px rgba(255, 82, 0, 0.42);
  color: #FFFFFF;
}

.btn-secondary {
  background: var(--grad-blue);
  color: #FFFFFF;
  box-shadow: var(--shadow-blue);
}

.btn-secondary:hover {
  transform: translateY(-2px);
  box-shadow: 0 16px 40px rgba(0, 114, 255, 0.38);
  color: #FFFFFF;
}

.btn-outline {
  background: transparent;
  color: var(--navy-dark);
  border: 2px solid var(--border-bright);
}

.btn-outline:hover {
  background: rgba(0, 114, 255, 0.06);
  border-color: var(--blue-electric);
  color: var(--navy-dark);
  transform: translateY(-2px);
}

.btn-white {
  background: #FFFFFF;
  color: var(--navy-dark);
  box-shadow: var(--shadow-md);
}

.btn-white:hover {
  background: #F8FAFC;
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  color: var(--navy-dark);
}

.btn-whatsapp {
  background: #25D366;
  color: #FFFFFF;
  box-shadow: 0 10px 28px rgba(37, 211, 102, 0.32);
}

.btn-whatsapp:hover {
  background: #20BA5A;
  color: #FFFFFF;
  transform: translateY(-2px);
  box-shadow: 0 14px 34px rgba(37, 211, 102, 0.45);
}

/* Glass Card Utility */
.glass-card {
  background: var(--bg-glass);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  transition: var(--transition-normal);
}

.glass-card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--border-bright);
}