/* ===== CSS Variables ===== */
:root {
  --color-primary: #3b82f6;
  --color-primary-dark: #2563eb;
  --color-secondary: #94a3b8;
  --color-accent: #38bdf8;
  --color-text: #f1f5f9;
  --color-text-light: #cbd5e1;
  --color-text-muted: #94a3b8;
  --color-bg: #0f172a;
  --color-bg-alt: #1e293b;
  --color-bg-dark: #020617;
  --color-border: #334155;
  --color-success: #10b981;
  --color-error: #ef4444;

  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  --font-mono: 'SF Mono', Monaco, 'Cascadia Code', monospace;

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

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;
  --radius-full: 9999px;

  --transition: 0.2s ease;

  --container-width: 1200px;
  --navbar-height: 64px;
}

/* ===== Reset & Base ===== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover {
  color: var(--color-primary-dark);
}

ul {
  list-style: none;
}

/* ===== Container ===== */
.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 24px;
  font-size: 16px;
  font-weight: 500;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
}

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

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

.btn-secondary {
  background-color: transparent;
  color: var(--color-text);
  border: 2px solid var(--color-border);
}

.btn-secondary:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

/* ===== Navigation ===== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--navbar-height);
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  z-index: 1000;
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.logo {
  font-size: 24px;
  font-weight: 700;
  color: var(--color-text);
}

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

.nav-links {
  display: flex;
  gap: 32px;
}

.nav-links a {
  color: var(--color-text-light);
  font-weight: 500;
  padding: 8px 0;
  position: relative;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--color-text);
}

.nav-links a.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background-color: var(--color-primary);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-text);
  transition: all var(--transition);
}

/* ===== Sections ===== */
.section {
  padding: 80px 0;
}

.section-title {
  font-size: 32px;
  font-weight: 700;
  margin-bottom: 40px;
  color: var(--color-text);
}

/* ===== Hero ===== */
.hero {
  padding-top: calc(var(--navbar-height) + 80px);
  padding-bottom: 80px;
  background: linear-gradient(135deg, var(--color-bg-alt) 0%, var(--color-bg) 100%);
}

.hero-content {
  max-width: 640px;
}

.hero h1 {
  font-size: 48px;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 16px;
}

.highlight {
  color: var(--color-primary);
}

.hero-subtitle {
  font-size: 20px;
  color: var(--color-text-light);
  margin-bottom: 24px;
}

.hero-description {
  font-size: 18px;
  color: var(--color-text-light);
  margin-bottom: 32px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

/* ===== Page Header ===== */
.page-header {
  padding-top: calc(var(--navbar-height) + 60px);
  padding-bottom: 60px;
  background: var(--color-bg-alt);
  text-align: center;
}

.page-header h1 {
  font-size: 40px;
  font-weight: 800;
  margin-bottom: 12px;
}

.page-header p {
  font-size: 18px;
  color: var(--color-text-light);
}

/* ===== About Section ===== */
.about-content {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 48px;
}

.about-text p {
  margin-bottom: 16px;
  color: var(--color-text-light);
  font-size: 18px;
}

.about-links h3 {
  font-size: 18px;
  margin-bottom: 16px;
}

.about-links ul {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.about-links a {
  color: var(--color-text-light);
}

.about-links a:hover {
  color: var(--color-primary);
}

/* ===== Features ===== */
.features {
  background: var(--color-bg-alt);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.feature-card {
  background: var(--color-bg);
  padding: 32px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition);
}

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

.feature-icon {
  width: 56px;
  height: 56px;
  background: var(--color-bg-alt);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  margin-bottom: 20px;
}

.feature-card h3 {
  font-size: 20px;
  margin-bottom: 12px;
}

.feature-card p {
  color: var(--color-text-light);
  margin-bottom: 16px;
}

.feature-link {
  font-weight: 500;
  color: var(--color-primary);
}

.feature-link:hover {
  text-decoration: underline;
}

/* ===== Blog ===== */
.blog-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  margin-bottom: 48px;
}

.blog-card {
  background: var(--color-bg);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition);
  border: 1px solid var(--color-border);
}

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

.blog-card-image {
  aspect-ratio: 16/10;
  background: var(--color-bg-alt);
}

.placeholder-image {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
}

.blog-card-content {
  padding: 24px;
}

.blog-date {
  font-size: 14px;
  color: var(--color-text-muted);
  margin-bottom: 8px;
  display: block;
}

.blog-card h2 {
  font-size: 20px;
  margin-bottom: 12px;
}

.blog-card p {
  color: var(--color-text-light);
  margin-bottom: 16px;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.read-more {
  font-weight: 500;
  color: var(--color-primary);
}

.read-more:hover {
  text-decoration: underline;
}

.blog-cta {
  text-align: center;
  padding: 32px;
  background: var(--color-bg-alt);
  border-radius: var(--radius-lg);
}

.blog-cta p {
  color: var(--color-text-light);
}

/* ===== Contact ===== */
.contact-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 64px;
}

.contact-form-container h2,
.contact-info h2 {
  font-size: 24px;
  margin-bottom: 24px;
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.form-group label {
  font-weight: 500;
  font-size: 14px;
  color: var(--color-text);
}

.form-group input,
.form-group textarea {
  padding: 12px 16px;
  font-size: 16px;
  font-family: inherit;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  outline: none;
  transition: border-color var(--transition);
  background-color: var(--color-bg-alt);
  color: var(--color-text);
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--color-primary);
}

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

.form-status {
  padding: 12px 16px;
  border-radius: var(--radius-md);
  margin-top: 16px;
  display: none;
}

.form-status.success {
  display: block;
  background: #064e3b;
  color: #6ee7b7;
}

.form-status.error {
  display: block;
  background: #7f1d1d;
  color: #fca5a5;
}

.contact-methods {
  display: flex;
  flex-direction: column;
  gap: 24px;
  margin-bottom: 32px;
}

.contact-method {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.contact-icon {
  width: 48px;
  height: 48px;
  background: var(--color-bg-alt);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  flex-shrink: 0;
}

.contact-details h3 {
  font-size: 16px;
  margin-bottom: 4px;
}

.contact-details p {
  color: var(--color-text-light);
  font-size: 14px;
}

.social-links h3 {
  font-size: 16px;
  margin-bottom: 16px;
}

.social-icons {
  display: flex;
  gap: 12px;
}

.social-icon {
  width: 44px;
  height: 44px;
  background: var(--color-bg-alt);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-light);
  transition: all var(--transition);
}

.social-icon:hover {
  background: var(--color-primary);
  color: white;
}

/* ===== Footer ===== */
.footer {
  margin-top: auto;
  padding: 32px 0;
  background: var(--color-bg-alt);
  border-top: 1px solid var(--color-border);
  text-align: center;
}

.footer p {
  color: var(--color-text-light);
  font-size: 14px;
}

/* ===== Mobile Responsive ===== */
@media (max-width: 992px) {
  .features-grid,
  .blog-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .about-content {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .contact-grid {
    grid-template-columns: 1fr;
    gap: 48px;
  }
}

@media (max-width: 768px) {
  :root {
    --navbar-height: 60px;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-links {
    position: fixed;
    top: var(--navbar-height);
    left: 0;
    right: 0;
    background: var(--color-bg);
    flex-direction: column;
    padding: 24px;
    gap: 16px;
    border-bottom: 1px solid var(--color-border);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition);
  }

  .nav-links.active {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .hero h1 {
    font-size: 36px;
  }

  .hero-subtitle {
    font-size: 18px;
  }

  .hero-description {
    font-size: 16px;
  }

  .section {
    padding: 60px 0;
  }

  .section-title {
    font-size: 28px;
    margin-bottom: 32px;
  }

  .page-header h1 {
    font-size: 32px;
  }

  .features-grid,
  .blog-grid {
    grid-template-columns: 1fr;
  }

  .hero-actions {
    flex-direction: column;
  }

  .hero-actions .btn {
    width: 100%;
  }
}

/* ===== Utility Classes ===== */
.hidden {
  display: none !important;
}

.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;
}