/* ============================================================
   lo0 — Custom Hugo Theme CSS
   ============================================================ */

:root {
  --bg: #0a0e17;
  --bg2: #111827;
  --bg3: #1a2235;
  --accent: #00d4ff;
  --accent2: #0099cc;
  --text: #e2e8f0;
  --text-muted: #8899aa;
  --border: #1e2d42;
  --font-mono: 'Space Mono', monospace;
  --font-body: 'DM Sans', sans-serif;
  --radius: 8px;
  --max-w: 1200px;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
}

a { color: var(--accent); text-decoration: none; transition: opacity .2s; }
a:hover { opacity: .8; }

.container { max-width: var(--max-w); margin: 0 auto; padding: 0 24px; }

/* ---- BUTTONS ---- */
.btn {
  display: inline-block;
  padding: 12px 28px;
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: .875rem;
  font-weight: 700;
  cursor: pointer;
  transition: all .2s;
  border: 2px solid transparent;
}
.btn-primary {
  background: var(--accent);
  color: #000;
}
.btn-primary:hover { background: var(--accent2); opacity: 1; }
.btn-outline {
  border-color: var(--accent);
  color: var(--accent);
  background: transparent;
}
.btn-outline:hover { background: var(--accent); color: #000; opacity: 1; }

/* ---- TOPBAR ---- */
.topbar {
  background: var(--bg3);
  border-bottom: 1px solid var(--border);
  font-size: .8rem;
  color: var(--text-muted);
}
.topbar-inner {
  display: flex;
  gap: 24px;
  padding: 8px 24px;
}
.topbar a { color: var(--text-muted); }
.topbar a:hover { color: var(--accent); }

/* ---- NAVBAR ---- */
.navbar {
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(8px);
}
.navbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
}
.logo {
  display: flex;
  align-items: baseline;
  gap: 10px;
  color: var(--text);
}
.logo-mark {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text);
}
.logo-zero { color: var(--accent); }
.logo-tagline {
  font-size: .75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: .1em;
}
.nav-links { display: flex; gap: 8px; }
.nav-links a {
  color: var(--text-muted);
  font-size: .875rem;
  padding: 8px 14px;
  border-radius: var(--radius);
  transition: all .2s;
}
.nav-links a:hover, .nav-links a.active {
  color: var(--accent);
  background: rgba(0,212,255,.08);
}
.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text);
  font-size: 1.4rem;
  cursor: pointer;
}
.mobile-nav {
  display: none;
  flex-direction: column;
  background: var(--bg2);
  border-top: 1px solid var(--border);
  padding: 16px 24px;
  gap: 8px;
}
.mobile-nav.open { display: flex; }
.mobile-nav a { color: var(--text-muted); padding: 8px 0; }
.mobile-nav a:hover { color: var(--accent); }

/* ---- HERO ---- */
.hero {
  padding: 100px 0 80px;
  background: radial-gradient(ellipse at top left, rgba(0,212,255,.08) 0%, transparent 60%);
  border-bottom: 1px solid var(--border);
}
.hero-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}
.hero-eyebrow {
  font-family: var(--font-mono);
  font-size: .8rem;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: .15em;
  margin-bottom: 16px;
}
.hero h1 {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 600;
  line-height: 1.2;
  margin-bottom: 20px;
}
.hero-sub {
  font-family: var(--font-mono);
  font-size: .8rem;
  color: var(--text-muted);
  letter-spacing: .08em;
  margin-bottom: 36px;
}
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }
.hero-code {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  font-family: var(--font-mono);
  font-size: .85rem;
  line-height: 1.8;
  position: relative;
  overflow: hidden;
}
.hero-code::before {
  content: '● ● ●';
  display: block;
  color: var(--text-muted);
  font-size: .7rem;
  letter-spacing: .3em;
  margin-bottom: 16px;
}
.hero-code .c { color: #4a7060; }
.hero-code .k { color: var(--accent); }
.hero-code .s { color: #a8d8a8; }

/* ---- FEATURES ---- */
.features {
  padding: 80px 0;
  border-bottom: 1px solid var(--border);
}
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}
.feature {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  transition: border-color .2s;
}
.feature:hover { border-color: var(--accent); }
.feature-icon { font-size: 1.8rem; display: block; margin-bottom: 12px; }
.feature h3 { font-size: 1rem; margin-bottom: 8px; }
.feature p { color: var(--text-muted); font-size: .9rem; }

/* ---- COURSES GRID ---- */
.courses-section { padding: 80px 0; border-bottom: 1px solid var(--border); }
.section-title {
  font-size: 1.8rem;
  margin-bottom: 40px;
  font-weight: 600;
}
.courses-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
}
.course-card {
  display: block;
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  color: var(--text);
  transition: all .2s;
}
.course-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(0,212,255,.1);
}
.course-badge {
  display: inline-block;
  background: rgba(0,212,255,.12);
  color: var(--accent);
  border: 1px solid rgba(0,212,255,.3);
  border-radius: 4px;
  padding: 3px 10px;
  font-family: var(--font-mono);
  font-size: .75rem;
  margin-bottom: 12px;
}
.course-badge--large { font-size: .9rem; padding: 5px 14px; margin-bottom: 16px; }
.course-card h3 { font-size: 1rem; margin-bottom: 8px; }
.course-card p { color: var(--text-muted); font-size: .875rem; margin-bottom: 16px; }
.course-meta {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  font-family: var(--font-mono);
  font-size: .75rem;
  color: var(--text-muted);
}
.course-meta span::before { content: '· '; }
.course-meta span:first-child::before { content: ''; }
.course-meta--header { display: flex; gap: 20px; flex-wrap: wrap; margin-top: 16px; font-size: .9rem; color: var(--text-muted); }
.section-cta { margin-top: 40px; text-align: center; }

/* ---- NEWSLETTER ---- */
.newsletter {
  padding: 60px 0;
  background: var(--bg2);
  border-top: 1px solid var(--border);
}
.newsletter-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 40px;
  flex-wrap: wrap;
}
.newsletter h2 { font-size: 1.4rem; margin-bottom: 8px; }
.newsletter p { color: var(--text-muted); }
.newsletter-form { display: flex; gap: 12px; flex-wrap: wrap; }
.newsletter-form input {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px 16px;
  color: var(--text);
  font-family: var(--font-body);
  font-size: .9rem;
  min-width: 240px;
}
.newsletter-form input:focus { outline: none; border-color: var(--accent); }

/* ---- PAGE HEADER ---- */
.page-header {
  background: var(--bg2);
  border-bottom: 1px solid var(--border);
  padding: 60px 0 40px;
}
.page-header h1 { font-size: 2rem; margin-bottom: 12px; }
.page-intro { color: var(--text-muted); max-width: 680px; margin-top: 16px; }

/* ---- SINGLE LAYOUT ---- */
.single-layout {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 48px;
  padding-top: 48px;
  padding-bottom: 80px;
  align-items: start;
}
.single-content { max-width: 720px; }
.single-content h2 { font-size: 1.3rem; margin: 32px 0 12px; color: var(--accent); }
.single-content h3 { font-size: 1.1rem; margin: 24px 0 8px; }
.single-content p { margin-bottom: 16px; color: var(--text-muted); }
.single-content ul, .single-content ol { margin: 0 0 16px 24px; color: var(--text-muted); }
.single-content li { margin-bottom: 6px; }
.single-content pre {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  overflow-x: auto;
  margin-bottom: 20px;
  font-family: var(--font-mono);
  font-size: .85rem;
}
.single-content code {
  font-family: var(--font-mono);
  background: var(--bg2);
  border: 1px solid var(--border);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: .85em;
}
.single-content pre code { background: none; border: none; padding: 0; }
.sidebar-card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 20px;
}
.sidebar-card h3 { font-size: 1rem; margin-bottom: 12px; }
.sidebar-card p { color: var(--text-muted); font-size: .875rem; margin-bottom: 16px; }
.sidebar-link {
  display: block;
  color: var(--text-muted);
  font-size: .85rem;
  padding: 6px 0;
  border-bottom: 1px solid var(--border);
  transition: color .2s;
}
.sidebar-link:hover { color: var(--accent); }

/* ---- INSTRUCTORS ---- */
.list-section { padding: 60px 0; }
.instructors-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}
.instructor-card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  text-align: center;
}
.instructor-avatar {
  width: 72px; height: 72px;
  background: rgba(0,212,255,.15);
  border: 2px solid var(--accent);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-mono);
  font-size: 1.5rem;
  color: var(--accent);
  margin: 0 auto 16px;
}
.instructor-role { color: var(--accent); font-size: .85rem; margin-bottom: 16px; }
.instructor-certs { display: flex; flex-wrap: wrap; gap: 6px; justify-content: center; margin-bottom: 16px; }
.cert-badge {
  background: rgba(0,212,255,.1);
  color: var(--accent);
  border: 1px solid rgba(0,212,255,.25);
  border-radius: 4px;
  padding: 2px 8px;
  font-family: var(--font-mono);
  font-size: .7rem;
}
.instructor-excerpt { color: var(--text-muted); font-size: .875rem; }

/* ---- BLOG ---- */
.blog-list { display: flex; flex-direction: column; gap: 32px; }
.blog-card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
}
.blog-meta { display: flex; gap: 12px; align-items: center; margin-bottom: 12px; }
.blog-meta time { color: var(--text-muted); font-size: .8rem; font-family: var(--font-mono); }
.tag {
  background: rgba(0,212,255,.1);
  color: var(--accent);
  padding: 2px 8px;
  border-radius: 4px;
  font-size: .75rem;
  font-family: var(--font-mono);
}
.blog-card h2 { font-size: 1.2rem; margin-bottom: 8px; }
.blog-card h2 a { color: var(--text); }
.blog-card h2 a:hover { color: var(--accent); }
.blog-card p { color: var(--text-muted); margin-bottom: 16px; }
.read-more { font-family: var(--font-mono); font-size: .85rem; }

/* ---- GENERIC ---- */
.generic-list { display: flex; flex-direction: column; gap: 24px; }
.generic-item h2 { font-size: 1.2rem; margin-bottom: 8px; }
.generic-item p { color: var(--text-muted); }

/* ---- FOOTER ---- */
.site-footer {
  background: var(--bg2);
  border-top: 1px solid var(--border);
  padding: 60px 0 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 40px;
}
.footer-brand .logo-mark { font-family: var(--font-mono); font-size: 1.6rem; font-weight: 700; }
.footer-brand p { color: var(--text-muted); font-size: .875rem; margin-top: 12px; }
.footer-brand .footer-address { margin-top: 16px; }
.footer-brand a { color: var(--text-muted); }
.footer-brand a:hover { color: var(--accent); }
.footer-col h4 {
  font-size: .8rem;
  text-transform: uppercase;
  letter-spacing: .1em;
  color: var(--text-muted);
  margin-bottom: 16px;
  font-family: var(--font-mono);
}
.footer-col a {
  display: block;
  color: var(--text-muted);
  font-size: .875rem;
  margin-bottom: 8px;
}
.footer-col a:hover { color: var(--accent); }
.footer-bottom {
  border-top: 1px solid var(--border);
  padding: 20px 0;
}
.footer-bottom p { color: var(--text-muted); font-size: .8rem; }

/* ---- RESPONSIVE ---- */
@media (max-width: 900px) {
  .hero-inner { grid-template-columns: 1fr; }
  .hero-code { display: none; }
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .single-layout { grid-template-columns: 1fr; }
  .nav-links { display: none; }
  .nav-toggle { display: block; }
}
@media (max-width: 600px) {
  .features-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .newsletter-inner { flex-direction: column; align-items: flex-start; }
}