/* Estvalgus - Blue Neon Documentation Style (Unique 2026) */
:root {
  --blue-neon: #00D4FF;
  --blue-deep: #0A1625;
  --blue-accent: #3B82F6;
  --bg-main: #05050A;
  --card-bg: #0F172A;
  --text: #E2E8F0;
  --text-muted: #64748B;
}

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

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background: var(--bg-main);
  color: var(--text);
  line-height: 1.7;
  font-size: 16.5px;
}

h1, h2, h3 {
  font-weight: 700;
  line-height: 1.15;
  color: white;
}

h1 { font-size: 3.8rem; }
h2 { font-size: 2.6rem; }
h3 { font-size: 1.55rem; }

.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 32px;
}

/* Sticky Left Navigation */
.sidebar-nav {
  position: fixed;
  top: 0;
  left: 0;
  width: 260px;
  height: 100vh;
  background: #0A1625;
  border-right: 1px solid rgba(0, 212, 255, 0.12);
  padding: 40px 32px;
  z-index: 100;
  overflow-y: auto;
}

.sidebar-nav .logo {
  font-size: 2.3rem;
  font-weight: 900;
  background: linear-gradient(90deg, #00D4FF, #3B82F6);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 50px;
  display: block;
}

.sidebar-nav ul {
  list-style: none;
}

.sidebar-nav li {
  margin-bottom: 8px;
}

.sidebar-nav a {
  display: block;
  padding: 14px 20px;
  color: #94A3B8;
  text-decoration: none;
  border-radius: 12px;
  transition: all 0.2s;
  font-weight: 500;
}

.sidebar-nav a:hover,
.sidebar-nav a.active {
  background: rgba(0, 212, 255, 0.1);
  color: #00D4FF;
  box-shadow: 0 0 15px rgba(0, 212, 255, 0.2);
}

/* Main Content Area */
.main-content {
  margin-left: 260px;
  min-height: 100vh;
  padding-bottom: 80px;
}

/* Hero */
.hero {
  padding: 120px 60px 90px;
  background: linear-gradient(180deg, #0A1625 0%, #05050A 100%);
  position: relative;
}

.hero::after {
  content: '';
  position: absolute;
  top: 60px;
  right: 60px;
  width: 320px;
  height: 320px;
  background: radial-gradient(circle, rgba(0,212,255,0.15) 0%, transparent 70%);
  border-radius: 50%;
  z-index: 0;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 620px;
}

.hero h1 {
  font-size: 4.2rem;
  margin-bottom: 24px;
}

.hero p {
  font-size: 1.35rem;
  color: #94A3B8;
  max-width: 480px;
}

/* Buttons */
.btn-blue {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 16px 38px;
  background: #00D4FF;
  color: #05050A;
  font-weight: 700;
  border-radius: 12px;
  text-decoration: none;
  transition: all 0.3s;
  box-shadow: 0 0 25px rgba(0, 212, 255, 0.5);
}

.btn-blue:hover {
  background: #3B82F6;
  box-shadow: 0 0 40px rgba(59, 130, 246, 0.6);
  transform: translateY(-2px);
}

.btn-outline {
  display: inline-flex;
  align-items: center;
  padding: 15px 36px;
  border: 2px solid #00D4FF;
  color: #00D4FF;
  border-radius: 12px;
  text-decoration: none;
  font-weight: 600;
  transition: all 0.3s;
}

.btn-outline:hover {
  background: rgba(0, 212, 255, 0.1);
}

/* Articles Grid */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(360px, 1fr));
  gap: 28px;
  padding: 0 60px;
}

.article-card {
  background: var(--card-bg);
  border: 1px solid rgba(0, 212, 255, 0.15);
  border-radius: 20px;
  padding: 34px 30px;
  transition: all 0.4s cubic-bezier(0.23, 1.0, 0.32, 1);
}

.article-card:hover {
  border-color: #00D4FF;
  box-shadow: 0 0 30px rgba(0, 212, 255, 0.25);
  transform: translateY(-6px);
}

.article-card h3 {
  color: #00D4FF;
  margin-bottom: 18px;
  font-size: 1.48rem;
}

.article-card p {
  color: #CBD5E1;
  line-height: 1.75;
}

.article-meta {
  margin-top: 26px;
  font-size: 0.9rem;
  color: #64748B;
  display: flex;
  gap: 14px;
}

/* Long Text Section */
.long-text {
  padding: 80px 60px;
  max-width: 820px;
}

.long-text p {
  font-size: 17px;
  color: #CBD5E1;
  margin-bottom: 24px;
}

/* Contact Form */
.contact-section {
  padding: 80px 60px;
  background: #0A1625;
}

.form-group {
  margin-bottom: 24px;
}

input, textarea {
  width: 100%;
  background: #05050A;
  border: 1px solid rgba(0, 212, 255, 0.25);
  color: white;
  padding: 16px 20px;
  border-radius: 12px;
  font-size: 1rem;
}

input:focus, textarea:focus {
  border-color: #00D4FF;
  box-shadow: 0 0 12px rgba(0, 212, 255, 0.3);
  outline: none;
}

textarea {
  min-height: 150px;
  resize: vertical;
}

/* Footer */
footer {
  background: #020205;
  padding: 70px 0 40px;
  margin-left: 260px;
}

.footer-content {
  padding: 0 60px;
}

/* Responsive */
@media (max-width: 1024px) {
  .sidebar-nav {
    display: none;
  }
  .main-content, footer {
    margin-left: 0;
  }
  .hero, .articles-grid, .long-text, .contact-section {
    padding-left: 32px;
    padding-right: 32px;
  }
}