/* ==========================================
   XYSALOR - Main CSS
   Structured Insight Framework Design System
   ========================================== */

/* ==========================================
   1. CSS VARIABLES & COLOR SYSTEM
   ========================================== */
:root {
  /* PRIMARY COLORS */
  --color-primary: #1A2E44;
  --color-primary-light: #2A3E54;
  --color-accent-orange: #F5A623;
  --color-accent-teal: #50A3A2;
  
  /* NEUTRAL COLORS */
  --color-white: #FFFFFF;
  --color-off-white: #F8F8F8;
  --color-light-gray: #E0E0E0;
  --color-medium-gray: #6C757D;
  --color-dark-gray: #333333;
  --color-black: #000000;
  
  /* SPACING SYSTEM */
  --space-xs: 8px;
  --space-sm: 16px;
  --space-md: 20px;
  --space-lg: 40px;
  --space-xl: 80px;
  --space-xxl: 120px;
  
  /* TYPOGRAPHY */
  --font-heading: 'Montserrat', 'Lato', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-body: 'Open Sans', 'Source Sans Pro', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'Courier New', monospace;
  
  /* SIZING */
  --line-height-heading: 1.2;
  --line-height-body: 1.6;
  --line-height-relaxed: 1.7;
  
  /* BORDER & RADIUS */
  --radius: 4px;
  --shadow-light: 0 2px 8px rgba(0, 0, 0, 0.08);
  --shadow-medium: 0 4px 16px rgba(0, 0, 0, 0.12);
  --shadow-hover: 0 8px 24px rgba(0, 0, 0, 0.16);
  
  /* TRANSITIONS */
  --transition-fast: 0.2s ease-in-out;
  --transition-smooth: 0.3s ease-in-out;
}

/* ==========================================
   2. RESET & BASE STYLES
   ========================================== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: var(--font-body);
  color: var(--color-dark-gray);
  background-color: var(--color-off-white);
  line-height: var(--line-height-body);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ==========================================
   3. TYPOGRAPHY
   ========================================== */
h1 {
  font-family: var(--font-heading);
  font-size: 48px;
  font-weight: 700;
  line-height: var(--line-height-heading);
  letter-spacing: -0.5px;
  color: var(--color-primary);
  margin-bottom: var(--space-lg);
}

h2 {
  font-family: var(--font-heading);
  font-size: 36px;
  font-weight: 700;
  line-height: var(--line-height-heading);
  color: var(--color-primary);
  margin-bottom: var(--space-lg);
}

h3 {
  font-family: var(--font-heading);
  font-size: 24px;
  font-weight: 600;
  line-height: var(--line-height-heading);
  color: var(--color-primary);
  margin-bottom: var(--space-md);
}

h4 {
  font-family: var(--font-heading);
  font-size: 18px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: var(--space-md);
}

p {
  font-size: 18px;
  line-height: var(--line-height-relaxed);
  margin-bottom: 1.5em;
  color: var(--color-dark-gray);
}

a {
  color: var(--color-accent-orange);
  text-decoration: none;
  transition: color var(--transition-fast);
  font-weight: 500;
}

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

strong {
  font-weight: 600;
  color: var(--color-primary);
}

/* ==========================================
   4. LAYOUT & CONTAINER
   ========================================== */
.container {
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 var(--space-md);
}

.container-fluid {
  width: 100%;
  padding: 0 var(--space-md);
}

/* ==========================================
   5. HEADER & NAVIGATION
   ========================================== */
header {
  background-color: var(--color-primary);
  color: var(--color-white);
  padding: var(--space-md) 0;
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: var(--shadow-light);
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 var(--space-md);
}

.logo {
  font-family: var(--font-heading);
  font-size: 24px;
  font-weight: 700;
  color: var(--color-white);
  letter-spacing: 1px;
  transition: color var(--transition-fast);
}

.logo:hover {
  color: var(--color-accent-orange);
}

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

nav a {
  color: var(--color-white);
  font-family: var(--font-heading);
  font-size: 14px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  transition: color var(--transition-fast);
  padding-bottom: 4px;
  border-bottom: 2px solid transparent;
}

nav a:hover,
nav a.active {
  color: var(--color-accent-orange);
  border-bottom-color: var(--color-accent-orange);
  text-decoration: none;
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--color-white);
  font-size: 24px;
  cursor: pointer;
}

/* ==========================================
   6. HERO SECTION
   ========================================== */
.hero {
  position: relative;
  width: 100%;
  height: 600px;
  background: url('../images/hero-eyes.jpg') center/cover no-repeat;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: var(--color-white);
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(26, 46, 68, 0.5);
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 800px;
  padding: var(--space-xl);
}

.hero h1 {
  font-size: 56px;
  color: var(--color-white);
  margin-bottom: var(--space-lg);
  text-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

.hero p {
  font-size: 20px;
  color: var(--color-off-white);
  margin-bottom: var(--space-xl);
  line-height: var(--line-height-relaxed);
}

/* ==========================================
   7. SECTIONS & SPACING
   ========================================== */
section {
  padding: var(--space-xxl) 0;
}

section.section-light {
  background-color: var(--color-off-white);
}

section.section-dark {
  background-color: var(--color-primary);
  color: var(--color-white);
}

section.section-dark h2,
section.section-dark h3,
section.section-dark h4 {
  color: var(--color-white);
}

section.section-dark p {
  color: var(--color-off-white);
}

section.section-dark a {
  color: var(--color-accent-orange);
}

/* ==========================================
   8. GRID SYSTEM (2-COLUMN & 3-COLUMN)
   ========================================== */
.grid {
  display: grid;
  gap: var(--space-xl);
  margin-bottom: var(--space-xl);
}

.grid-2 {
  grid-template-columns: 1fr 1fr;
}

.grid-3 {
  grid-template-columns: 1fr 1fr 1fr;
}

.grid-col-6 {
  grid-column: span 1;
}

/* ==========================================
   9. CARDS
   ========================================== */
.card {
  background-color: var(--color-white);
  border-radius: var(--radius);
  padding: var(--space-lg);
  box-shadow: var(--shadow-light);
  transition: all var(--transition-smooth);
  border: 1px solid var(--color-light-gray);
}

.card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-4px);
}

.card h3 {
  margin-bottom: var(--space-md);
}

.card p {
  margin-bottom: 0;
}

/* ==========================================
   10. BUTTONS & CTA
   ========================================== */
.btn {
  display: inline-block;
  padding: 12px 28px;
  border-radius: var(--radius);
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  transition: all var(--transition-fast);
  cursor: pointer;
  border: none;
  text-decoration: none;
  text-align: center;
}

.btn-primary {
  background-color: var(--color-accent-orange);
  color: var(--color-white);
}

.btn-primary:hover {
  background-color: #e6951f;
  text-decoration: none;
  box-shadow: var(--shadow-medium);
}

.btn-secondary {
  background-color: var(--color-accent-teal);
  color: var(--color-white);
}

.btn-secondary:hover {
  background-color: #3d8b8a;
  text-decoration: none;
  box-shadow: var(--shadow-medium);
}

.btn-outline {
  background-color: transparent;
  color: var(--color-accent-orange);
  border: 2px solid var(--color-accent-orange);
}

.btn-outline:hover {
  background-color: var(--color-accent-orange);
  color: var(--color-white);
  text-decoration: none;
}

/* ==========================================
   11. FOOTER
   ========================================== */
footer {
  background-color: var(--color-primary);
  color: var(--color-off-white);
  padding: var(--space-xl) 0 var(--space-lg);
  margin-top: var(--space-xxl);
}

footer p {
  color: var(--color-off-white);
  margin-bottom: 0;
}

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

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

.footer-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: var(--space-xl);
  margin-bottom: var(--space-xl);
}

.footer-section h4 {
  color: var(--color-white);
  margin-bottom: var(--space-md);
}

.footer-section ul {
  list-style: none;
}

.footer-section li {
  margin-bottom: var(--space-sm);
}

.footer-section a {
  transition: color var(--transition-fast);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: var(--space-lg);
  text-align: center;
  font-size: 14px;
}

/* ==========================================
   12. FORMS
   ========================================== */
form {
  max-width: 600px;
}

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

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

input,
textarea,
select {
  width: 100%;
  padding: 12px;
  border: 1px solid var(--color-light-gray);
  border-radius: var(--radius);
  font-family: var(--font-body);
  font-size: 16px;
  transition: all var(--transition-fast);
}

input:focus,
textarea:focus,
select:focus {
  outline: none;
  border-color: var(--color-accent-orange);
  box-shadow: 0 0 0 3px rgba(245, 166, 35, 0.1);
}

textarea {
  resize: vertical;
  min-height: 120px;
}

/* ==========================================
   13. LISTS & DECORATIONS
   ========================================== */
ul,
ol {
  margin-left: var(--space-lg);
  margin-bottom: var(--space-lg);
}

li {
  margin-bottom: var(--space-sm);
  line-height: var(--line-height-relaxed);
}

ul li::marker {
  color: var(--color-accent-orange);
}

/* ==========================================
   14. IMAGES
   ========================================== */
img {
  max-width: 100%;
  height: auto;
  display: block;
  border-radius: var(--radius);
}

.img-responsive {
  width: 100%;
  height: auto;
}

/* ==========================================
   15. TWO-COLUMN LAYOUT (TEXT + IMAGE)
   ========================================== */
.two-column {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  align-items: center;
}

.two-column-text {
  order: -1;
}

.two-column-image {
  width: 100%;
}

.two-column.reverse .two-column-text {
  order: 1;
}

/* ==========================================
   16. DISCLAIMER & INFO BLOCKS
   ========================================== */
.info-block {
  background-color: var(--color-light-gray);
  border-left: 4px solid var(--color-accent-orange);
  padding: var(--space-lg);
  margin: var(--space-xl) 0;
  border-radius: var(--radius);
}

.info-block p {
  margin-bottom: 0;
  font-size: 16px;
}

.disclaimer-block {
  background-color: #FFF3E0;
  border: 1px solid var(--color-accent-orange);
  border-radius: var(--radius);
  padding: var(--space-lg);
  margin: var(--space-xl) 0;
}

.disclaimer-block h4 {
  color: var(--color-accent-orange);
  margin-bottom: var(--space-md);
}

/* ==========================================
   17. BLOG & ARTICLES
   ========================================== */
.blog-card {
  background-color: var(--color-white);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-light);
  transition: all var(--transition-smooth);
  display: flex;
  flex-direction: column;
}

.blog-card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-8px);
}

.blog-card-image {
  width: 100%;
  height: 240px;
  overflow: hidden;
  background-color: var(--color-light-gray);
}

.blog-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.blog-card-content {
  padding: var(--space-lg);
  flex-grow: 1;
  display: flex;
  flex-direction: column;
}

.blog-card h3 {
  margin-bottom: var(--space-md);
  line-height: 1.4;
}

.blog-card-meta {
  font-size: 14px;
  color: var(--color-medium-gray);
  margin-bottom: var(--space-md);
}

.blog-card p {
  flex-grow: 1;
  margin-bottom: var(--space-md);
}

.blog-article {
  max-width: 800px;
  margin: 0 auto;
}

.blog-article h1 {
  margin-bottom: var(--space-md);
}

.blog-article-meta {
  color: var(--color-medium-gray);
  margin-bottom: var(--space-xl);
  font-size: 16px;
}

.blog-article img {
  width: 100%;
  margin: var(--space-xl) 0;
  border-radius: var(--radius);
}

/* ==========================================
   18. RESPONSIVE DESIGN
   ========================================== */
@media (max-width: 1024px) {
  h1 {
    font-size: 40px;
  }
  
  h2 {
    font-size: 32px;
  }
  
  .grid-2,
  .grid-3 {
    grid-template-columns: 1fr;
  }
  
  .two-column {
    grid-template-columns: 1fr;
  }
  
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
  
  nav ul {
    gap: var(--space-md);
  }
  
  nav a {
    font-size: 13px;
  }
}

@media (max-width: 768px) {
  :root {
    font-size: 15px;
  }
  
  h1 {
    font-size: 32px;
  }
  
  h2 {
    font-size: 26px;
  }
  
  h3 {
    font-size: 20px;
  }
  
  p {
    font-size: 16px;
  }
  
  .hero {
    height: 400px;
  }
  
  .hero h1 {
    font-size: 36px;
  }
  
  .hero p {
    font-size: 16px;
  }
  
  section {
    padding: var(--space-xl) 0;
  }
  
  .container,
  .container-fluid {
    padding: 0 var(--space-md);
  }
  
  .header-content {
    padding: 0 var(--space-md);
  }
  
  nav {
    display: none;
  }
  
  .menu-toggle {
    display: block;
  }
  
  nav.mobile-active {
    display: block;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--color-primary);
    flex-direction: column;
    padding: var(--space-lg);
  }
  
  nav.mobile-active ul {
    flex-direction: column;
    gap: var(--space-md);
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }
  
  .two-column {
    gap: var(--space-lg);
  }
}

@media (max-width: 480px) {
  h1 {
    font-size: 28px;
  }
  
  h2 {
    font-size: 22px;
  }
  
  h3 {
    font-size: 18px;
  }
  
  .hero {
    height: 300px;
  }
  
  .hero h1 {
    font-size: 28px;
  }
  
  .btn {
    width: 100%;
    padding: 14px 20px;
  }
  
  .hero-content {
    padding: var(--space-lg);
  }
}

/* ==========================================
   19. UTILITY CLASSES
   ========================================== */
.text-center {
  text-align: center;
}

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

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

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

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

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

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

.p-lg {
  padding: var(--space-xl);
}

.hidden {
  display: none !important;
}

.visible {
  display: block !important;
}