/* ====================================
   XEVORY - Institutional Knowledge Portal
   Design System CSS
   ==================================== */

:root {
  /* Primary Brand Color */
  --primary: #2C3E50;
  
  /* Accent Colors */
  --accent-1: #E74C3C;    /* Terra Cotta */
  --accent-2: #F39C12;    /* Marigold */
  --accent-3: #2ECC71;    /* Forest Green */
  
  /* Neutral Colors */
  --neutral-bg-light: #F8F8F8;
  --neutral-bg-med: #EEEEEE;
  --neutral-text-secondary: #6C757D;
  --neutral-text-dark: #333333;
  --neutral-white: #FFFFFF;
  
  /* Spacing Scale (8px base unit) */
  --space-xs: 8px;
  --space-sm: 16px;
  --space-md: 24px;
  --space-lg: 48px;
  --space-xl: 80px;
  --space-2xl: 120px;
  
  /* Typography */
  --font-sans: 'Montserrat', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-serif: 'Merriweather', 'Georgia', serif;
  
  /* Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  
  /* Max Width */
  --max-width: 1440px;
}

/* ====================================
   RESET & BASE STYLES
   ==================================== */

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-serif);
  font-size: 16px;
  line-height: 1.6;
  color: var(--neutral-text-dark);
  background-color: var(--neutral-white);
  letter-spacing: 0.3px;
}

/* ====================================
   TYPOGRAPHY
   ==================================== */

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-sans);
  font-weight: 700;
  margin-bottom: var(--space-md);
  color: var(--primary);
}

h1 {
  font-size: 3.5rem;
  line-height: 1.1;
  letter-spacing: -1px;
  margin-bottom: var(--space-lg);
  font-weight: 700;
}

h2 {
  font-size: 2.5rem;
  line-height: 1.2;
  letter-spacing: -0.5px;
  margin-top: var(--space-xl);
  margin-bottom: var(--space-md);
}

h3 {
  font-size: 1.75rem;
  line-height: 1.3;
  margin-top: var(--space-lg);
}

h4 {
  font-size: 1.35rem;
  line-height: 1.4;
}

p {
  margin-bottom: var(--space-md);
  line-height: 1.65;
}

a {
  color: var(--accent-1);
  text-decoration: none;
  transition: all 300ms ease-out;
}

a:hover {
  color: var(--accent-2);
  text-decoration: underline;
}

/* ====================================
   LAYOUT & STRUCTURE
   ==================================== */

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-sm);
}

header {
  background-color: var(--primary);
  color: var(--neutral-white);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-md) var(--space-sm);
}

.logo {
  font-family: var(--font-sans);
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: 1px;
}

nav ul {
  display: flex;
  list-style: none;
  gap: var(--space-lg);
  align-items: center;
}

nav a {
  color: var(--neutral-white);
  font-size: 0.95rem;
  font-family: var(--font-sans);
  font-weight: 500;
  transition: color 300ms ease-out;
  position: relative;
  padding-bottom: 4px;
}

nav a:hover,
nav a.active {
  color: var(--accent-1);
}

nav a.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--accent-1);
}

main {
  min-height: calc(100vh - 200px);
}

footer {
  background-color: var(--primary);
  color: var(--neutral-white);
  padding: var(--space-xl) var(--space-sm);
  margin-top: var(--space-2xl);
}

footer .container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-lg);
}

footer a {
  color: var(--accent-1);
}

footer .disclaimer {
  grid-column: 1 / -1;
  border-top: 1px solid rgba(255, 255, 255, 0.2);
  padding-top: var(--space-md);
  margin-top: var(--space-md);
  font-size: 0.9rem;
  color: var(--neutral-bg-med);
}

/* ====================================
   SECTION STYLES
   ==================================== */

section {
  padding: var(--space-xl) var(--space-sm);
}

section:nth-child(even) {
  background-color: var(--neutral-bg-light);
}

.section-title-block {
  background: linear-gradient(135deg, var(--primary) 0%, rgba(44, 62, 80, 0.9) 100%);
  color: var(--neutral-white);
  padding: var(--space-2xl) var(--space-sm);
  text-align: center;
  margin-bottom: var(--space-xl);
}

.section-title-block h1,
.section-title-block h2 {
  color: var(--neutral-white);
  margin-bottom: var(--space-md);
}

.section-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-lg);
  align-items: center;
  margin-bottom: var(--space-xl);
}

.section-content.text-left {
  grid-template-columns: 1fr 1fr;
}

.section-content.text-right {
  grid-template-columns: 1fr 1fr;
}

.section-content.text-right .text-block {
  order: 2;
}

.section-content.text-right .image-block {
  order: 1;
}

.image-block {
  overflow: hidden;
  border-radius: var(--radius-md);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
}

.image-block img {
  width: 100%;
  height: auto;
  display: block;
  transition: transform 300ms ease-out;
}

.image-block:hover img {
  transform: scale(1.02);
}

.text-block h2 {
  margin-top: 0;
}

.text-block p {
  color: var(--neutral-text-secondary);
  line-height: 1.7;
}

/* ====================================
   CARDS & COMPONENTS
   ==================================== */

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-lg);
  margin: var(--space-lg) 0;
}

.card {
  background-color: var(--neutral-white);
  border: 1px solid #E8E8E8;
  border-radius: var(--radius-md);
  padding: var(--space-md);
  transition: all 300ms ease-out;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.card:hover {
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.12);
  transform: translateY(-2px);
  border-color: var(--accent-1);
}

.card-title {
  font-family: var(--font-sans);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: var(--space-sm);
}

.card-text {
  color: var(--neutral-text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* ====================================
   BUTTONS & CTAs
   ==================================== */

.cta-button {
  display: inline-block;
  background-color: var(--accent-1);
  color: var(--neutral-white);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-md);
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.95rem;
  transition: all 300ms ease-out;
  text-decoration: none;
  border: none;
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(231, 76, 60, 0.3);
}

.cta-button:hover {
  background-color: var(--accent-2);
  box-shadow: 0 6px 16px rgba(243, 156, 18, 0.3);
  transform: translateY(-2px);
  text-decoration: none;
  color: var(--neutral-white);
}

.cta-secondary {
  background-color: transparent;
  color: var(--accent-1);
  border: 2px solid var(--accent-1);
}

.cta-secondary:hover {
  background-color: var(--accent-1);
  color: var(--neutral-white);
}

/* ====================================
   DISCLAIMER SECTION
   ==================================== */

.disclaimer-section {
  background-color: var(--neutral-bg-light);
  border-left: 4px solid var(--accent-1);
  padding: var(--space-md);
  margin: var(--space-lg) 0;
  border-radius: var(--radius-md);
}

.disclaimer-section h3 {
  margin-top: 0;
  font-size: 1.1rem;
}

.disclaimer-section p {
  margin-bottom: 0;
  font-size: 0.95rem;
  color: var(--neutral-text-secondary);
}

/* ====================================
   FORMS
   ==================================== */

form {
  max-width: 600px;
  margin: var(--space-lg) 0;
}

.form-group {
  margin-bottom: var(--space-md);
}

label {
  display: block;
  font-family: var(--font-sans);
  font-weight: 600;
  margin-bottom: var(--space-xs);
  color: var(--primary);
}

input,
textarea {
  width: 100%;
  padding: var(--space-sm);
  font-family: var(--font-serif);
  border: 1px solid #DDD;
  border-radius: var(--radius-md);
  font-size: 1rem;
  transition: border-color 300ms ease-out;
}

input:focus,
textarea:focus {
  outline: none;
  border-color: var(--accent-1);
  box-shadow: 0 0 0 3px rgba(231, 76, 60, 0.1);
}

textarea {
  resize: vertical;
  min-height: 150px;
}

/* ====================================
   LISTS & TYPOGRAPHY UTILITIES
   ==================================== */

ul, ol {
  margin: var(--space-md) 0 var(--space-md) var(--space-lg);
  line-height: 1.8;
}

li {
  margin-bottom: var(--space-sm);
  color: var(--neutral-text-secondary);
}

strong {
  color: var(--primary);
  font-weight: 700;
}

blockquote {
  border-left: 4px solid var(--accent-1);
  padding-left: var(--space-md);
  margin: var(--space-lg) 0;
  font-style: italic;
  color: var(--neutral-text-secondary);
}

/* ====================================
   RESPONSIVE DESIGN
   ==================================== */

@media (max-width: 768px) {
  h1 {
    font-size: 2.5rem;
  }
  
  h2 {
    font-size: 1.75rem;
  }
  
  h3 {
    font-size: 1.35rem;
  }
  
  .section-content {
    grid-template-columns: 1fr;
  }
  
  .section-content.text-right .text-block,
  .section-content.text-right .image-block {
    order: unset;
  }
  
  nav ul {
    gap: var(--space-md);
  }
  
  nav a {
    font-size: 0.85rem;
  }
  
  footer .container {
    grid-template-columns: 1fr;
  }
  
  .card-grid {
    grid-template-columns: 1fr;
  }
  
  section {
    padding: var(--space-lg) var(--space-sm);
  }
}

@media (max-width: 480px) {
  header .container {
    flex-direction: column;
    gap: var(--space-sm);
  }
  
  nav ul {
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-sm);
  }
  
  h1 {
    font-size: 1.75rem;
  }
  
  h2 {
    font-size: 1.35rem;
  }
  
  .logo {
    font-size: 1.25rem;
  }
}

/* ====================================
   UTILITY CLASSES
   ==================================== */

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

.mt-lg {
  margin-top: var(--space-lg);
}

.mb-lg {
  margin-bottom: var(--space-lg);
}

.accent-1 {
  color: var(--accent-1);
}

.accent-2 {
  color: var(--accent-2);
}

.accent-3 {
  color: var(--accent-3);
}