:root {
  --dark-blue: #0b0f2a;
  --medium-blue: #1c2a4d;
  --light-blue: #3a7ca5;
  --silver: #c0c0c0;
  --light-silver: #e0e0e0;
  --text-color: #f0f0f0;
  --font-family: 'Cairo', sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  background-color: var(--dark-blue);
  color: var(--text-color);
  line-height: 1.7;
  font-size: 16px;
}

.container {
  width: 90%;
  max-width: 1200px;
  margin: 0 auto;
}

h1, h2, h3 {
  font-weight: 900;
  line-height: 1.3;
  color: var(--light-silver);
  margin-bottom: 0.75em;
}

h1 { font-size: clamp(2.5rem, 5vw, 4rem); }
h2 { font-size: clamp(2rem, 4vw, 3rem); }
h3 { font-size: 1.5rem; }

a {
  color: var(--light-blue);
  text-decoration: none;
  transition: color 0.3s ease;
}

a:hover, a:focus {
  color: var(--silver);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* --- Header & Navigation --- */
.site-header {
  padding: 1rem 0;
  background-color: rgba(11, 15, 42, 0.8);
  backdrop-filter: blur(10px);
  position: fixed;
  top: 0;
  width: 100%;
  z-index: 1000;
  border-bottom: 1px solid var(--medium-blue);
}

.site-header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 1.75rem;
  font-weight: 900;
  color: #fff;
}

.main-nav ul {
  list-style: none;
  display: flex;
  gap: 2rem;
}

.main-nav a {
  color: var(--light-silver);
  font-weight: bold;
  padding: 0.5rem 0;
  position: relative;
}

.main-nav a::after {
  content: '';
  position: absolute;
  bottom: 0;
  right: 0;
  width: 0;
  height: 2px;
  background-color: var(--light-blue);
  transition: width 0.3s ease;
}

.main-nav a:hover::after, .main-nav a:focus::after, .main-nav a.active::after {
  width: 100%;
}

.main-nav a.active {
    color: #fff;
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
}

/* --- Hero Section --- */
.hero {
  position: relative;
  height: 80vh;
  min-height: 500px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  background-image: url('https://images.unsplash.com/photo-1534796636912-3b95b3ab5986?ixlib=rb-4.0.3&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D&auto=format&fit=crop&w=1770&q=80');
  background-size: cover;
  background-position: center;
  margin-top: 65px; /* Header height */
}

.hero-overlay {
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background: linear-gradient(to top, var(--dark-blue) 0%, rgba(11, 15, 42, 0.5) 100%);
}

.hero-content {
  position: relative;
  z-index: 2;
}

.hero h1 { color: #fff; }
.hero p { font-size: 1.25rem; max-width: 600px; margin: 0 auto 2rem; }

/* --- Buttons --- */
.cta-button, .cta-button-secondary {
  display: inline-block;
  padding: 0.8rem 2.5rem;
  border-radius: 50px;
  font-weight: bold;
  text-transform: uppercase;
  transition: all 0.3s ease;
  border: 2px solid var(--light-blue);
  letter-spacing: 1px;
}

.cta-button {
  background-color: var(--light-blue);
  color: #fff;
}

.cta-button:hover, .cta-button:focus {
  background-color: var(--silver);
  border-color: var(--silver);
  color: var(--dark-blue);
  transform: translateY(-3px);
  box-shadow: 0 5px 15px rgba(192,192,192,0.2);
}

.cta-button-secondary {
    background-color: transparent;
    color: var(--light-blue);
}

.cta-button-secondary:hover, .cta-button-secondary:focus {
    background-color: var(--light-blue);
    color: #fff;
}

/* --- Sections --- */
section {
  padding: 5rem 0;
}

.section-title {
  text-align: center;
  margin-bottom: 3rem;
}

.featured-articles { background-color: var(--medium-blue); }

.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

/* --- Article Card --- */
.article-card {
  background: var(--dark-blue);
  border-radius: 15px;
  overflow: hidden;
  box-shadow: 0 10px 20px rgba(0,0,0,0.2);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  display: flex;
  flex-direction: column;
  opacity: 0;
  transform: translateY(20px);
  animation: slide-in 0.5s forwards;
}

@keyframes slide-in {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.article-card:hover {
  transform: translateY(-10px);
  box-shadow: 0 15px 30px rgba(58, 124, 165, 0.3);
}

.article-image {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

.article-content {
  padding: 1.5rem;
  flex-grow: 1;
  display: flex;
  flex-direction: column;
}

.article-content h3 { margin-top: 0; }

.article-content p {
  flex-grow: 1;
  margin-bottom: 1rem;
  color: var(--silver);
}

.read-more {
  font-weight: bold;
  align-self: flex-start;
}

/* --- About Snippet --- */
.about-snippet .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
}
.about-snippet-image img {
    width: 100%;
    border-radius: 15px;
    box-shadow: 0 10px 20px rgba(0,0,0,0.3);
}

/* --- Pages --- */
.page-header {
    background: var(--medium-blue);
    padding: 8rem 0 4rem 0;
    text-align: center;
}
.articles-page, .about-content, .contact-form-section { padding-top: 3rem; }
.text-content { max-width: 800px; margin: 0 auto; }
.text-content p, .text-content ul { margin-bottom: 1.5rem; }
.text-content ul { padding-right: 2rem; }
.content-image { width: 100%; border-radius: 15px; margin: 2rem 0; }

/* -- Contact Form -- */
.contact-container { 
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 3rem;
    background-color: var(--medium-blue);
    padding: 3rem;
    border-radius: 15px;
}
.contact-info ul { list-style: none; }
.contact-info li { margin-bottom: 1rem; }
.contact-info strong { color: var(--light-silver);}
.contact-form .form-group { margin-bottom: 1.5rem; }
.contact-form label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: bold;
    color: var(--silver);
}
.contact-form input, .contact-form textarea {
    width: 100%;
    padding: 0.8rem;
    background-color: var(--dark-blue);
    border: 1px solid var(--light-blue);
    border-radius: 8px;
    color: var(--text-color);
    font-family: var(--font-family);
}
.contact-form input:focus, .contact-form textarea:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(58, 124, 165, 0.5);
    border-color: var(--silver);
}
.contact-form button {
    width: 100%;
}

button:disabled {
    background-color: #555;
    border-color: #555;
    cursor: not-allowed;
}


/* --- Footer --- */
.site-footer {
  background: var(--medium-blue);
  padding: 2rem 0;
  margin-top: 4rem;
  border-top: 1px solid var(--dark-blue);
  text-align: center;
}

.site-footer .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.site-footer p { color: var(--silver); }
.footer-nav { display: flex; gap: 1rem; }
.footer-nav a { color: var(--silver); }

/* --- Animations --- */
@keyframes fade-in-up {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}
.fade-in-up { animation: fade-in-up 0.6s ease-out forwards; opacity: 0; }
.delay-1 { animation-delay: 0.2s; }
.delay-2 { animation-delay: 0.4s; }

/* --- Responsive --- */
@media (max-width: 768px) {
  .site-header .container { flex-wrap: wrap; }
  .menu-toggle { display: block; z-index: 1001; }
  .hamburger { width: 25px; height: 3px; background-color: white; position: relative; transition: all 0.3s ease;}
  .hamburger::before, .hamburger::after { content: ''; position: absolute; width: 25px; height: 3px; background-color: white; right: 0; transition: all 0.3s ease; }
  .hamburger::before { top: -8px; }
  .hamburger::after { bottom: -8px; }
  .main-nav ul {
    position: fixed;
    top: 0; right: 0; bottom: 0; 
    background: var(--dark-blue);
    flex-direction: column;
    width: 70%;
    padding: 6rem 2rem 2rem;
    transform: translateX(100%);
    transition: transform 0.3s ease-out;
    text-align: center;
  }
  .main-nav[data-visible="true"] ul { transform: translateX(0); }
  .menu-toggle[aria-expanded="true"] .hamburger { background-color: transparent; }
  .menu-toggle[aria-expanded="true"] .hamburger::before { transform: rotate(45deg) translate(5px, 6px); }
  .menu-toggle[aria-expanded="true"] .hamburger::after { transform: rotate(-45deg) translate(5px, -6px); }

  .hero { height: 70vh; }
  .about-snippet .container { grid-template-columns: 1fr; }
  .about-snippet-image { order: -1; }
  .contact-container { grid-template-columns: 1fr; }
  .site-footer .container { flex-direction: column; }
}