:root {
  --bg-primary: #0a0c10;
  --bg-secondary: #12161f;
  --bg-tertiary: #1a202c;
  --border-color: rgba(255, 255, 255, 0.08);
  --border-highlight: rgba(11, 92, 255, 0.3);
  --text-primary: #ffffff;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --accent: #0b5cff;
  --accent-hover: #1d4ed8;
  --accent-light: rgba(11, 92, 255, 0.12);
  --success: #10b981;
  --warning: #f59e0b;
  --card-radius: 14px;
  --max-width: 960px;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.65;
  font-size: 15px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Header & Nav */
header {
  border-bottom: 1px solid var(--border-color);
  background: rgba(10, 12, 16, 0.85);
  backdrop-filter: blur(12px);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--text-primary);
  font-weight: 700;
  font-size: 18px;
}

.brand-icon {
  width: 34px;
  height: 34px;
  background: linear-gradient(135deg, #0b5cff, #2563eb);
  border-radius: 9px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 12px rgba(11, 92, 255, 0.35);
}

.brand-icon svg {
  width: 20px;
  height: 20px;
  fill: #ffffff;
}

nav {
  display: flex;
  align-items: center;
  gap: 8px;
}

nav a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  padding: 8px 14px;
  border-radius: 8px;
  transition: all 0.2s ease;
}

nav a:hover, nav a.active {
  color: #ffffff;
  background: rgba(255, 255, 255, 0.06);
}

nav a.active {
  color: #38bdf8;
  font-weight: 600;
}

.github-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 6px 12px;
  border-radius: 8px;
}

.github-link:hover {
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
  text-decoration: none;
}

/* Main Container */
main {
  flex: 1;
  max-width: var(--max-width);
  width: 100%;
  margin: 0 auto;
  padding: 48px 24px 80px;
}

.page-header {
  margin-bottom: 40px;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 24px;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--accent-light);
  color: #60a5fa;
  font-size: 12px;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: 20px;
  margin-bottom: 14px;
  border: 1px solid rgba(11, 92, 255, 0.25);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

h1 {
  font-size: 32px;
  font-weight: 700;
  letter-spacing: -0.7px;
  margin-bottom: 10px;
  color: #ffffff;
}

.meta-date {
  font-size: 13px;
  color: var(--text-muted);
}

/* Sections & Typography */
section {
  margin-bottom: 44px;
}

h2 {
  font-size: 20px;
  font-weight: 600;
  color: #f8fafc;
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 10px;
  letter-spacing: -0.3px;
}

h3 {
  font-size: 16px;
  font-weight: 600;
  color: #e2e8f0;
  margin: 20px 0 10px;
}

p {
  color: var(--text-secondary);
  margin-bottom: 14px;
}

ul, ol {
  color: var(--text-secondary);
  margin-bottom: 16px;
  padding-left: 24px;
}

li {
  margin-bottom: 8px;
}

strong {
  color: #f1f5f9;
}

a {
  color: #38bdf8;
  text-decoration: none;
  transition: color 0.15s;
}

a:hover {
  text-decoration: underline;
}

/* Callout & Cards */
.card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--card-radius);
  padding: 24px;
  margin-bottom: 24px;
}

.callout {
  background: rgba(11, 92, 255, 0.06);
  border: 1px solid rgba(11, 92, 255, 0.25);
  border-left: 4px solid var(--accent);
  border-radius: 8px;
  padding: 16px 20px;
  margin: 20px 0;
}

.callout p {
  margin: 0;
  color: #cbd5e1;
  font-size: 14px;
}

.callout-title {
  font-weight: 600;
  color: #ffffff;
  margin-bottom: 4px !important;
}

.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

@media (max-width: 720px) {
  .grid-2 {
    grid-template-columns: 1fr;
  }
  .header-container {
    flex-direction: column;
    gap: 14px;
  }
  nav {
    flex-wrap: wrap;
    justify-content: center;
  }
}

/* Step cards */
.step-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--card-radius);
  padding: 24px;
  margin-bottom: 20px;
  display: flex;
  gap: 20px;
}

.step-number {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--accent);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 15px;
  flex-shrink: 0;
}

.step-content {
  flex: 1;
}

.step-content h3 {
  margin-top: 0;
  margin-bottom: 8px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--accent);
  color: #ffffff;
  padding: 10px 20px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 14px;
  border: none;
  cursor: pointer;
  text-decoration: none;
  transition: background 0.2s;
}

.btn:hover {
  background: var(--accent-hover);
  text-decoration: none;
}

.btn-outline {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-primary);
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.06);
}

/* Code styling */
code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 13px;
  background: rgba(255, 255, 255, 0.08);
  padding: 2px 6px;
  border-radius: 4px;
  color: #38bdf8;
}

/* Footer */
footer {
  border-top: 1px solid var(--border-color);
  background: var(--bg-secondary);
  padding: 40px 24px;
  margin-top: auto;
}

.footer-container {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 20px;
  text-align: center;
}

.footer-links {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 20px;
}

.footer-links a {
  color: var(--text-secondary);
  font-size: 14px;
}

.footer-links a:hover {
  color: #ffffff;
}

.footer-disclaimer {
  font-size: 12px;
  color: var(--text-muted);
  max-width: 680px;
  margin: 0 auto;
  line-height: 1.5;
}