:root {
  --primary-color: #00D4FF;
  --secondary-color: #0284C7;
  --accent-gold: #E3B341;
  --terminal-green: #38EF7D;
  --bg-color: #0D1117;
  --card-bg: #161B22;
  --card-border: #30363D;
  --text-primary: #F0F6FC;
  --text-secondary: #8B949E;
  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-mono: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
  --gradient: linear-gradient(135deg, #00D4FF 0%, #0284C7 100%);
  --gradient-gold: linear-gradient(135deg, #E3B341 0%, #F59E0B 100%);
}

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

body {
  font-family: var(--font-family);
  background-color: var(--bg-color);
  color: var(--text-primary);
  line-height: 1.65;
  font-size: 16px;
}

.container {
  width: 90%;
  max-width: 960px;
  margin: 0 auto;
}

/* Header & Navigation */
header {
  background: rgba(22, 27, 34, 0.94);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--card-border);
  position: sticky;
  top: 0;
  z-index: 1000;
  padding: 1rem 0;
}

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

.logo-group {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
}

.logo-group img {
  width: 38px;
  height: 38px;
  border-radius: 9px;
  box-shadow: 0 2px 8px rgba(0, 212, 255, 0.25);
}

.logo-group h1 {
  font-size: 1.3rem;
  font-weight: 700;
  color: #fff;
  letter-spacing: -0.5px;
}

nav ul {
  display: flex;
  list-style: none;
  gap: 1.25rem;
  flex-wrap: wrap;
}

nav a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  transition: color 0.2s ease;
}

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

/* Content Cards & Main */
main {
  padding: 2.5rem 0 4rem;
}

.content-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 14px;
  padding: 2.5rem;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.35);
}

.content-card h2 {
  font-size: 1.85rem;
  margin-bottom: 0.5rem;
  color: #fff;
  letter-spacing: -0.5px;
}

.last-updated {
  display: inline-block;
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 1.75rem;
  background: rgba(139, 148, 158, 0.1);
  padding: 0.25rem 0.65rem;
  border-radius: 6px;
  border: 1px solid var(--card-border);
}

.alert-box {
  background: rgba(0, 212, 255, 0.08);
  border-left: 4px solid var(--primary-color);
  padding: 1.25rem;
  border-radius: 0 8px 8px 0;
  margin-bottom: 2rem;
  font-size: 0.95rem;
}

.alert-box-gold {
  background: rgba(227, 179, 65, 0.08);
  border-left: 4px solid var(--accent-gold);
  padding: 1.25rem;
  border-radius: 0 8px 8px 0;
  margin-bottom: 2rem;
  font-size: 0.95rem;
}

.content-card h3 {
  font-size: 1.25rem;
  color: var(--primary-color);
  margin: 1.75rem 0 0.75rem;
  border-bottom: 1px solid rgba(48, 54, 61, 0.6);
  padding-bottom: 0.4rem;
}

.content-card h4 {
  font-size: 1.05rem;
  color: var(--accent-gold);
  margin: 1.25rem 0 0.5rem;
}

.content-card p {
  margin-bottom: 1rem;
  color: var(--text-primary);
  font-size: 0.98rem;
}

.content-card ul, .content-card ol {
  margin-bottom: 1.25rem;
  padding-left: 1.5rem;
}

.content-card li {
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.content-card a {
  color: var(--primary-color);
  text-decoration: none;
}

.content-card a:hover {
  text-decoration: underline;
}

.content-card code {
  background: rgba(110, 118, 129, 0.2);
  color: var(--primary-color);
  padding: 0.2rem 0.45rem;
  border-radius: 5px;
  font-family: var(--font-mono);
  font-size: 0.88em;
}

/* Hero Section (for index.html) */
.hero {
  text-align: center;
  padding: 4rem 1rem 3rem;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(0, 212, 255, 0.12);
  color: var(--primary-color);
  border: 1px solid rgba(0, 212, 255, 0.3);
  padding: 0.4rem 1rem;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
}

.hero h1 {
  font-size: 2.75rem;
  line-height: 1.2;
  margin-bottom: 1.25rem;
  letter-spacing: -1px;
}

.hero-gradient-text {
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero p {
  font-size: 1.15rem;
  color: var(--text-secondary);
  max-width: 650px;
  margin: 0 auto 2rem;
}

.cta-group {
  display: flex;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 3rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.8rem 1.6rem;
  border-radius: 8px;
  font-weight: 600;
  text-decoration: none;
  font-size: 0.95rem;
  transition: all 0.2s ease;
}

.btn-primary {
  background: var(--gradient);
  color: #0d1117;
  box-shadow: 0 4px 14px rgba(0, 212, 255, 0.35);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(0, 212, 255, 0.5);
}

.btn-secondary {
  background: var(--card-bg);
  color: var(--text-primary);
  border: 1px solid var(--card-border);
}

.btn-secondary:hover {
  background: rgba(110, 118, 129, 0.15);
  border-color: var(--primary-color);
}

/* Feature Grid */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(270px, 1fr));
  gap: 1.5rem;
  margin: 3rem 0;
}

.feature-box {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 12px;
  padding: 1.75rem;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.feature-box:hover {
  transform: translateY(-3px);
  border-color: var(--primary-color);
}

.feature-icon {
  font-size: 2rem;
  margin-bottom: 1rem;
  display: inline-block;
}

.feature-box h3 {
  font-size: 1.15rem;
  color: #fff;
  margin-bottom: 0.5rem;
}

.feature-box p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin: 0;
}

/* Footer */
footer {
  border-top: 1px solid var(--card-border);
  padding: 2.5rem 0;
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.85rem;
}

footer p {
  margin-bottom: 0.5rem;
}

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

footer a:hover {
  text-decoration: underline;
}

/* Responsive */
@media (max-width: 768px) {
  .hero h1 {
    font-size: 2rem;
  }
  .content-card {
    padding: 1.5rem;
  }
  .nav {
    flex-direction: column;
    align-items: flex-start;
  }
}