/* LED Matrix WebServer — Standalone CSS */

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

:root {
  --color-primary: #2196F3;
  --color-primary-dark: #1976D2;
  --color-accent: #00BCD4;
  --color-success: #4CAF50;
  --color-warning: #FF9800;
  --color-error: #F44336;

  --color-bg: #f5f7fa;
  --color-surface: #ffffff;
  --color-text: #333333;

  --shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.15);

  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
}

/* Header & Navigation */
header {
  background: var(--color-surface);
  box-shadow: var(--shadow);
  position: sticky;
  top: 0;
  z-index: 100;
}

nav {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-primary);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.nav-menu {
  display: flex;
  gap: 2rem;
  list-style: none;
  align-items: center;
}

.nav-menu a {
  color: var(--color-text);
  text-decoration: none;
  font-weight: 500;
  transition: var(--transition);
  position: relative;
}

.nav-menu a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  transition: var(--transition);
}

.nav-menu a:hover::after {
  width: 100%;
}

/* Hero Section */
.hero {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
  color: white;
  padding: 4rem 2rem;
  text-align: center;
}

.hero-content {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}

.hero-text h1 {
  font-size: 2.5rem;
  margin-bottom: 1rem;
  line-height: 1.2;
}

.hero-text p {
  font-size: 1.1rem;
  margin-bottom: 2rem;
  opacity: 0.95;
}

.version-badge {
  display: inline-block;
  background: rgba(255, 255, 255, 0.2);
  padding: 0.5rem 1rem;
  border-radius: 20px;
  font-size: 0.9rem;
  margin-bottom: 1rem;
  border: 1px solid rgba(255, 255, 255, 0.3);
}

.cta-buttons {
  display: flex;
  gap: 1rem;
  justify-content: flex-start;
}

.btn {
  padding: 0.75rem 1.5rem;
  border-radius: 6px;
  border: none;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
  display: inline-block;
  font-size: 1rem;
}

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

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.2);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.2);
  color: white;
  border: 2px solid white;
}

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

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

.hero-image img {
  max-width: 100%;
  height: auto;
}

@media (max-width: 768px) {
  .hero-content {
    grid-template-columns: 1fr;
  }
  .hero-text h1 {
    font-size: 1.8rem;
  }
  .cta-buttons {
    flex-direction: column;
  }
}

/* Main Content */
main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 3rem 2rem;
}

.section {
  margin-bottom: 3rem;
}

.section-title {
  font-size: 2rem;
  margin-bottom: 1.5rem;
  color: var(--color-primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.section-title::before {
  content: '';
  width: 4px;
  height: 2rem;
  background: var(--color-primary);
  border-radius: 2px;
}

/* Cards */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
  margin-bottom: 2rem;
}

.card {
  background: var(--color-surface);
  border-radius: 8px;
  padding: 1.5rem;
  box-shadow: var(--shadow);
  transition: var(--transition);
  border-left: 4px solid var(--color-primary);
}

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

.card-title {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--color-primary);
}

.card-subtitle {
  font-size: 0.85rem;
  color: var(--color-accent);
  margin-bottom: 1rem;
}

.card-content {
  font-size: 0.95rem;
  line-height: 1.6;
}

/* Features */
.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
}

.feature {
  display: flex;
  gap: 1rem;
}

.feature-icon {
  font-size: 2rem;
  color: var(--color-primary);
  flex-shrink: 0;
}

.feature-text h3 {
  margin-bottom: 0.5rem;
  color: var(--color-primary);
}

.feature-text p {
  font-size: 0.95rem;
}

/* Specs Table */
.specs-table {
  background: var(--color-surface);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: var(--shadow);
  margin-bottom: 2rem;
}

.specs-table table {
  width: 100%;
  border-collapse: collapse;
}

.specs-table th {
  background: var(--color-primary);
  color: white;
  padding: 1rem;
  text-align: left;
  font-weight: 600;
}

.specs-table td {
  padding: 1rem;
  border-bottom: 1px solid rgba(0, 0, 0, 0.1);
}

.specs-table tr:last-child td {
  border-bottom: none;
}

.specs-table tr:nth-child(even) {
  background: rgba(33, 150, 243, 0.02);
}

/* Code Block */
.code-block {
  background: var(--color-surface);
  border-left: 4px solid var(--color-accent);
  padding: 1.5rem;
  border-radius: 6px;
  overflow-x: auto;
  margin: 1.5rem 0;
  box-shadow: var(--shadow);
}

.code-block pre {
  margin: 0;
  font-family: "Monaco", "Menlo", "Ubuntu Mono", monospace;
  font-size: 0.9rem;
  line-height: 1.5;
}

.code-label {
  font-size: 0.85rem;
  color: var(--color-accent);
  font-weight: 600;
  margin-bottom: 0.5rem;
  text-transform: uppercase;
  letter-spacing: 1px;
}

/* Footer */
footer {
  background: var(--color-surface);
  border-top: 1px solid rgba(0, 0, 0, 0.1);
  padding: 3rem 2rem;
  margin-top: 4rem;
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
  margin-bottom: 2rem;
}

.footer-section h4 {
  margin-bottom: 1rem;
  color: var(--color-primary);
}

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

.footer-section a {
  color: var(--color-text);
  text-decoration: none;
  opacity: 0.8;
  transition: var(--transition);
}

.footer-section a:hover {
  color: var(--color-primary);
  opacity: 1;
}

.footer-bottom {
  text-align: center;
  padding-top: 2rem;
  border-top: 1px solid rgba(0, 0, 0, 0.1);
  opacity: 0.7;
}

/* Responsive */
@media (max-width: 768px) {
  nav {
    flex-direction: column;
    gap: 1rem;
  }

  .nav-menu {
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.75rem 1.25rem;
  }

  main {
    padding: 2rem 1rem;
  }

  .section-title {
    font-size: 1.5rem;
  }

  .hero-text h1 {
    font-size: 2rem;
  }
}