/* ==========================================================================
   CSS Custom Properties & Design Tokens
   (Based on PROJECT_RULES.md)
   ========================================================================== */

:root {
  /* Color Palette - Banner Logo Inspired */
  --color-navy-dark: #051A3D;
  --color-blue-deep: #083B82;
  --color-blue-main: #0066CC;
  --color-blue-bright: #1D9BF0;
  --color-blue-light: #38BDF8;
  --color-gray-dark: #1F2937;
  --color-gray-medium: #6B7280;
  --color-gray-light: #F3F4F6;
  --color-white: #FFFFFF;
  --color-success: #10B981;
  --color-danger: #EF4444;

  /* Typography */
  --font-family-base: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-family-ar: "Noto Sans Arabic", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-size-h1: 2.25rem;
  --font-size-h2: 1.75rem;
  --font-size-h3: 1.25rem;
  --font-size-body: 1rem;
  --font-size-sm: 0.875rem;

  /* Line Heights */
  --line-height-h1: 1.2;
  --line-height-h2: 1.3;
  --line-height-h3: 1.4;
  --line-height-body: 1.6;
  --line-height-sm: 1.5;

  /* Spacing Scale (8px system) */
  --space-4: 4px;
  --space-8: 8px;
  --space-16: 16px;
  --space-24: 24px;
  --space-32: 32px;
  --space-48: 48px;
  --space-64: 64px;

  /* Layout & Container */
  --container-max-width: 1200px;
  --container-padding: var(--space-16);

  /* Border Radii */
  --radius-sm: 6px;
  --radius-md: 12px;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);

  /* Transitions */
  --transition-fast: 0.15s ease-in-out;
  --transition-normal: 0.25s ease-in-out;
}

@media (min-width: 768px) {
  :root {
    --container-padding: var(--space-24);
  }
}

/* ==========================================================================
   RTL / LTR Direction Support
   ========================================================================== */

html[dir="rtl"] {
  --font-family-base: var(--font-family-ar);
}

html[dir="rtl"] body {
  direction: rtl;
  text-align: right;
}

html[dir="ltr"] body {
  direction: ltr;
  text-align: left;
}

/* Logical Properties for RTL/LTR Support */
:root {
  /* Use logical properties where possible for automatic RTL support */
}

.container {
  margin-inline: auto;
  padding-inline: var(--container-padding);
}

/* ==========================================================================
   Modern CSS Reset
   ========================================================================== */

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

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

body {
  min-height: 100vh;
  font-family: var(--font-family-base);
  font-size: var(--font-size-body);
  line-height: var(--line-height-body);
  color: var(--color-gray-dark);
  background-color: var(--color-white);
  display: flex;
  flex-direction: column;
}

img,
picture,
video,
canvas,
svg {
  display: block;
  max-width: 100%;
  height: auto;
}

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

button {
  cursor: pointer;
  background: none;
  border: none;
}

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

a:hover {
  color: var(--color-blue-bright);
}

ul,
ol {
  list-style: none;
}

/* ==========================================================================
   Typography Standards
   ========================================================================== */

h1,
h2,
h3,
h4,
h5,
h6 {
  color: var(--color-navy-dark);
  font-weight: 700;
  text-wrap: balance;
}

h1 {
  font-size: var(--font-size-h1);
  line-height: var(--line-height-h1);
}

h2 {
  font-size: var(--font-size-h2);
  line-height: var(--line-height-h2);
  font-weight: 600;
}

h3 {
  font-size: var(--font-size-h3);
  line-height: var(--line-height-h3);
  font-weight: 600;
}

p {
  margin-bottom: var(--space-16);
}

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

small,
.text-sm {
  font-size: var(--font-size-sm);
  line-height: var(--line-height-sm);
}

.text-muted {
  color: var(--color-gray-medium);
}

/* ==========================================================================
   Layout Containers & Utilities
   ========================================================================== */

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

.section {
  padding-top: var(--space-48);
  padding-bottom: var(--space-48);
}

@media (min-width: 1024px) {
  .section {
    padding-top: var(--space-64);
    padding-bottom: var(--space-64);
  }
}

.section-alt {
  background-color: var(--color-gray-light);
}

.section-header {
  margin-bottom: var(--space-32);
  text-align: center;
}

.section-header h2 {
  margin-bottom: var(--space-8);
}

.section-header p {
  color: var(--color-gray-medium);
}

/* ==========================================================================
   Component Elements (Cards, Buttons, Grid)
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-8);
  padding: var(--space-8) var(--space-16);
  border-radius: var(--radius-sm);
  font-weight: 600;
  text-decoration: none;
  transition: all var(--transition-fast);
  border: 1px solid transparent;
  line-height: 1.5;
}

.btn-primary {
  background-color: var(--color-blue-main);
  color: var(--color-white);
}

.btn-primary:hover {
  background-color: var(--color-blue-deep);
  color: var(--color-white);
}

.btn-secondary {
  background-color: transparent;
  border-color: var(--color-blue-main);
  color: var(--color-blue-main);
}

.btn-secondary:hover {
  background-color: var(--color-blue-main);
  color: var(--color-white);
}

.btn-light {
  background-color: var(--color-white);
  color: var(--color-navy-dark);
}

.btn-light:hover {
  background-color: var(--color-gray-light);
}

.card-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-24);
}

@media (min-width: 768px) {
  .card-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .card-grid-3 {
    grid-template-columns: repeat(3, 1fr);
  }
}

.card {
  background-color: var(--color-white);
  border-radius: var(--radius-md);
  border: 1px solid #E5E7EB;
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.card-image {
  width: 100%;
  height: 220px;
  overflow: hidden;
  background-color: var(--color-gray-light);
}

.card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-normal);
}

.card:hover .card-image img {
  transform: scale(1.05);
}

.card-body {
  padding: var(--space-24);
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.card-tag {
  display: inline-block;
  align-self: flex-start;
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-blue-main);
  background-color: #EBF5FF;
  padding: var(--space-4) var(--space-8);
  border-radius: var(--radius-sm);
  margin-bottom: var(--space-12, 12px);
}

.card-title {
  margin-bottom: var(--space-8);
}

.card-meta {
  font-size: var(--font-size-sm);
  color: var(--color-gray-medium);
  margin-bottom: var(--space-16);
}

/* RTL specific card-tag alignment */
html[dir="rtl"] .card-tag {
  align-self: flex-end;
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */

.site-header {
  background-color: var(--color-navy-dark);
  color: var(--color-white);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-md);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: var(--space-8);
  color: var(--color-white);
  font-size: 1.25rem;
  font-weight: 700;
  text-decoration: none;
}

.brand-logo span {
  color: var(--color-blue-light);
}

.logo-image {
  height: 48px;
  width: auto;
  transition: transform var(--transition-fast);
}

.brand-logo:hover .logo-image {
  transform: scale(1.05);
}

@media (min-width: 768px) {
  .logo-image {
    height: 80px;
  }
}

.nav-toggle {
  display: flex;
  flex-direction: column;
  justify-content: space-around;
  width: 28px;
  height: 24px;
  cursor: pointer;
}

.nav-toggle span {
  width: 100%;
  height: 2px;
  background-color: var(--color-white);
  border-radius: 2px;
  transition: var(--transition-fast);
}

.nav-menu {
  display: none;
  flex-direction: column;
  position: absolute;
  top: 72px;
  inset-inline-start: 0;
  inset-inline-end: 0;
  background-color: var(--color-navy-dark);
  padding: var(--space-16) var(--container-padding);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  box-shadow: var(--shadow-lg);
  gap: var(--space-16);
}

.nav-menu.is-active {
  display: flex;
}

.nav-link {
  color: var(--color-white);
  font-weight: 500;
  padding: var(--space-8) 0;
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-blue-light);
}

@media (min-width: 768px) {
  .nav-toggle {
    display: none;
  }

  .nav-menu {
    display: flex;
    position: static;
    flex-direction: row;
    align-items: center;
    padding: 0;
    border-top: none;
    box-shadow: none;
    gap: var(--space-24);
  }

  .nav-link {
    padding: 0;
  }
}

/* ==========================================================================
   Hero Banner
   ========================================================================== */

.hero-banner {
  background: linear-gradient(135deg, var(--color-navy-dark) 0%, var(--color-blue-deep) 100%);
  color: var(--color-white);
  padding: var(--space-48) 0;
  position: relative;
  border-bottom: 4px solid var(--color-blue-light);
}

@media (min-width: 768px) {
  .hero-banner {
    padding: var(--space-64) 0;
  }
}

.hero-content {
  max-width: 700px;
}

.hero-logo {
  margin-bottom: var(--space-32);
}

.hero-logo-image {
  max-width: 100%;
  width: auto;
  height: auto;
  max-height: 120px;
}

@media (min-width: 768px) {
  .hero-logo-image {
    max-height: 160px;
  }
}

@media (min-width: 1024px) {
  .hero-logo-image {
    max-height: 200px;
  }
}

.hero-title {
  color: var(--color-white);
  font-size: 2.5rem;
  line-height: 1.15;
  margin-bottom: var(--space-16);
}

.hero-description {
  font-size: 1.125rem;
  color: #E5E7EB;
  margin-bottom: var(--space-24);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-16);
}

/* ==========================================================================
   STEM Image Section
   ========================================================================== */

.stem-section {
  padding: var(--space-32) 0;
  background-color: var(--color-white);
}

@media (min-width: 768px) {
  .stem-section {
    padding: var(--space-48) 0;
  }
}

.stem-image {
  max-width: 600px;
  width: 100%;
  height: auto;
  margin: 0 auto;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
}

@media (min-width: 768px) {
  .stem-image {
    max-width: 700px;
  }
}

@media (min-width: 1024px) {
  .stem-image {
    max-width: 800px;
  }
}

/* ==========================================================================
   Quick Stats / Highlights
   ========================================================================== */

.stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-16);
  margin-top: calc(-1 * var(--space-32));
  position: relative;
  z-index: 10;
}

@media (min-width: 768px) {
  .stats-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.stat-card {
  background: var(--color-white);
  padding: var(--space-24);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  text-align: center;
  border-top: 3px solid var(--color-blue-main);
}

.stat-number {
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-blue-deep);
  line-height: 1;
  margin-bottom: var(--space-4);
}

.stat-label {
  font-size: var(--font-size-sm);
  color: var(--color-gray-medium);
  font-weight: 500;
}

/* ==========================================================================
   Footer
   ========================================================================== */

.site-footer {
  margin-top: auto;
  background-color: var(--color-navy-dark);
  color: #D1D5DB;
  padding-top: var(--space-48);
  padding-bottom: var(--space-24);
  border-top: 3px solid var(--color-blue-deep);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-32);
  margin-bottom: var(--space-32);
}

@media (min-width: 768px) {
  .footer-grid {
    grid-template-columns: 2fr 1fr 1fr;
  }
}

.footer-brand h3 {
  color: var(--color-white);
  margin-bottom: var(--space-8);
}

.footer-logo {
  max-width: 400px;
  height: auto;
  margin-bottom: var(--space-16);
}

@media (min-width: 768px) {
  .footer-logo {
    max-width: 400px;
  }
}

.footer-heading {
  color: var(--color-white);
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: var(--space-16);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-8);
}

.footer-links a {
  color: #D1D5DB;
}

.footer-links a:hover {
  color: var(--color-blue-light);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: var(--space-24);
  text-align: center;
  font-size: var(--font-size-sm);
  color: var(--color-gray-medium);
}

/* ==========================================================================
   Language Switcher
   ========================================================================== */

.lang-switcher {
  display: flex;
  align-items: center;
}

.lang-switcher a {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-4) var(--space-8);
  border-radius: var(--radius-sm);
  color: var(--color-white);
  font-weight: 500;
  font-size: var(--font-size-sm);
  background-color: rgba(255, 255, 255, 0.1);
  transition: background-color var(--transition-fast);
}

.lang-switcher a:hover {
  background-color: rgba(255, 255, 255, 0.2);
  color: var(--color-white);
}

/* ==========================================================================
   Utilities for RTL
   ========================================================================== */

.text-start { text-align: start; }
.text-end { text-align: end; }
.ms-auto { margin-inline-start: auto; }
.me-auto { margin-inline-end: auto; }
.ps-0 { padding-inline-start: 0; }
.pe-0 { padding-inline-end: 0; }