@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=JetBrains+Mono:ital,wght@0,400;0,500;0,700;1,400&family=Space+Grotesk:wght@500;600;700&display=swap');

:root {
  --bg-obsidian: #07090e;
  --bg-surface: #0e131d;
  --bg-card: rgba(17, 23, 36, 0.75);
  --bg-card-hover: rgba(24, 33, 52, 0.85);
  --border-subtle: rgba(56, 189, 248, 0.15);
  --border-active: rgba(56, 189, 248, 0.45);
  --accent-cyan: #00f2fe;
  --accent-blue: #38bdf8;
  --accent-amber: #facc15;
  --accent-crimson: #ff3e3e;
  --accent-emerald: #10b981;
  --accent-purple: #a855f7;
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  --font-display: 'Space Grotesk', system-ui, -apple-system, sans-serif;
  --font-body: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --transition-fast: 0.18s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-smooth: 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  background-color: var(--bg-obsidian);
  color: var(--text-main);
  font-family: var(--font-body);
  line-height: 1.6;
  overflow-x: hidden;
  background-image: 
    radial-gradient(circle at 15% 15%, rgba(0, 242, 254, 0.05) 0%, transparent 45%),
    radial-gradient(circle at 85% 85%, rgba(168, 85, 247, 0.04) 0%, transparent 45%),
    linear-gradient(rgba(255, 255, 255, 0.015) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.015) 1px, transparent 1px);
  background-size: 100% 100%, 100% 100%, 32px 32px, 32px 32px;
  background-position: center center;
}

/* Scrollbar */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: var(--bg-obsidian);
}
::-webkit-scrollbar-thumb {
  background: #1e293b;
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--accent-blue);
}

/* Utility Typography */
h1, h2, h3, h4, .font-display {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: -0.02em;
}

code, pre, .font-mono {
  font-family: var(--font-mono);
}

.text-gradient {
  background: linear-gradient(135deg, #ffffff 0%, var(--accent-cyan) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.text-gradient-amber {
  background: linear-gradient(135deg, #ffffff 0%, var(--accent-amber) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Layout Containers */
.container {
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Navigation */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(7, 9, 14, 0.82);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  transition: var(--transition-smooth);
}

.nav-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.logo {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 10px;
}

.logo-badge {
  background: rgba(0, 242, 254, 0.12);
  color: var(--accent-cyan);
  border: 1px solid rgba(0, 242, 254, 0.3);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  white-space: nowrap;
}

.nav-links {
  display: flex;
  gap: 28px;
  list-style: none;
}

.nav-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  transition: var(--transition-fast);
}

.nav-links a:hover {
  color: var(--accent-cyan);
}

.nav-cta {
  background: linear-gradient(135deg, rgba(0, 242, 254, 0.15), rgba(56, 189, 248, 0.15));
  color: var(--accent-cyan);
  border: 1px solid var(--border-active);
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  text-decoration: none;
  transition: var(--transition-fast);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.nav-cta:hover {
  background: var(--accent-cyan);
  color: var(--bg-obsidian);
  box-shadow: 0 0 16px rgba(0, 242, 254, 0.4);
}

/* Hero Section */
.hero {
  padding: 140px 0 80px;
  min-height: 90vh;
  display: flex;
  align-items: center;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 48px;
  align-items: center;
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 6px 14px;
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.3);
  border-radius: 999px;
  color: var(--accent-emerald);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  margin-bottom: 24px;
}

.pulse-dot {
  width: 8px;
  height: 8px;
  background: var(--accent-emerald);
  border-radius: 50%;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7); }
  70% { transform: scale(1); box-shadow: 0 0 0 8px rgba(16, 185, 129, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

.hero-title {
  font-size: 3.5rem;
  line-height: 1.1;
  margin-bottom: 20px;
}

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--text-muted);
  margin-bottom: 32px;
  max-width: 620px;
}

.hero-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 36px;
}

.badge {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 8px;
}

.badge.highlight {
  border-color: rgba(250, 204, 21, 0.4);
  background: rgba(250, 204, 21, 0.08);
  color: var(--accent-amber);
}

.badge.bh-arsenal {
  border-color: rgba(255, 62, 62, 0.4);
  background: rgba(255, 62, 62, 0.08);
  color: #ff6b6b;
}

.hero-actions {
  display: flex;
  gap: 16px;
}

.btn-primary {
  background: var(--accent-cyan);
  color: var(--bg-obsidian);
  font-weight: 600;
  padding: 12px 24px;
  border-radius: var(--radius-sm);
  text-decoration: none;
  transition: var(--transition-fast);
  border: 1px solid transparent;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.btn-primary:hover {
  box-shadow: 0 0 20px rgba(0, 242, 254, 0.5);
  transform: translateY(-1px);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-main);
  font-weight: 500;
  padding: 12px 24px;
  border-radius: var(--radius-sm);
  text-decoration: none;
  border: 1px solid var(--border-subtle);
  transition: var(--transition-fast);
}

.btn-secondary:hover {
  border-color: var(--text-muted);
  background: rgba(255, 255, 255, 0.1);
}

/* Interactive Kernel Terminal Console */
.terminal-window {
  background: #0b0f19;
  border: 1px solid rgba(56, 189, 248, 0.25);
  border-radius: var(--radius-lg);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.6), 0 0 30px rgba(0, 242, 254, 0.08);
  overflow: hidden;
  font-family: var(--font-mono);
}

.terminal-header {
  background: #111726;
  padding: 12px 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.terminal-dots {
  display: flex;
  gap: 8px;
}

.terminal-dots span {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}

.dot-red { background: #ff5f56; }
.dot-yellow { background: #ffbd2e; }
.dot-green { background: #27c93f; }

.terminal-title {
  font-size: 0.75rem;
  color: var(--text-dim);
  letter-spacing: 0.05em;
}

.terminal-status {
  font-size: 0.7rem;
  color: var(--accent-emerald);
  display: flex;
  align-items: center;
  gap: 6px;
}

.terminal-body {
  padding: 20px;
  height: 340px;
  overflow-y: auto;
  font-size: 0.85rem;
}

.term-line {
  margin-bottom: 8px;
  word-break: break-all;
}

.term-prompt {
  color: var(--accent-cyan);
}

.term-cmd {
  color: var(--text-main);
  font-weight: 600;
}

.term-out {
  color: var(--text-muted);
  line-height: 1.5;
  margin-left: 12px;
  border-left: 2px solid rgba(56, 189, 248, 0.2);
  padding-left: 10px;
  margin-top: 4px;
}

.term-out strong {
  color: var(--text-main);
}

.terminal-footer {
  background: #0e1422;
  padding: 12px 18px;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}

.terminal-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.term-chip {
  background: rgba(56, 189, 248, 0.1);
  border: 1px solid rgba(56, 189, 248, 0.25);
  color: var(--accent-cyan);
  padding: 4px 10px;
  border-radius: 4px;
  font-size: 0.75rem;
  cursor: pointer;
  transition: var(--transition-fast);
  font-family: var(--font-mono);
}

.term-chip:hover {
  background: var(--accent-cyan);
  color: var(--bg-obsidian);
}

/* Sections General */
.section {
  padding: 100px 0;
  position: relative;
}

.section-header {
  margin-bottom: 56px;
}

.section-eyebrow {
  font-family: var(--font-mono);
  color: var(--accent-cyan);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 8px;
  display: block;
}

.section-title {
  font-size: 2.5rem;
  margin-bottom: 16px;
}

.section-desc {
  color: var(--text-muted);
  font-size: 1.1rem;
  max-width: 680px;
}

/* Research Cards Grid */
.research-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

.research-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 36px;
  transition: var(--transition-smooth);
  position: relative;
  overflow: hidden;
}

.research-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-active);
  transform: translateY(-3px);
  box-shadow: 0 16px 32px rgba(0, 0, 0, 0.4);
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 20px;
  flex-wrap: wrap;
  gap: 16px;
}

.card-title-group {
  max-width: 75%;
}

.card-tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 4px 10px;
  border-radius: 4px;
  font-weight: 600;
  text-transform: uppercase;
}

.tag-bh {
  background: rgba(255, 62, 62, 0.15);
  color: #ff6b6b;
  border: 1px solid rgba(255, 62, 62, 0.4);
}

.tag-journal {
  background: rgba(168, 85, 247, 0.15);
  color: #c084fc;
  border: 1px solid rgba(168, 85, 247, 0.4);
}

.tag-published {
  background: rgba(16, 185, 129, 0.15);
  color: var(--accent-emerald);
  border: 1px solid rgba(16, 185, 129, 0.4);
}

.card-title {
  font-size: 1.75rem;
  margin-top: 8px;
}

.card-subtitle {
  color: var(--text-muted);
  font-size: 1rem;
  margin-top: 4px;
}

.card-metrics {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 16px;
  margin: 24px 0;
  padding: 20px;
  background: rgba(0, 0, 0, 0.35);
  border-radius: var(--radius-md);
  border: 1px solid rgba(255, 255, 255, 0.05);
}

.metric-item {
  display: flex;
  flex-direction: column;
}

.metric-val {
  font-family: var(--font-mono);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--accent-cyan);
}

.metric-label {
  font-size: 0.8rem;
  color: var(--text-dim);
}

.card-body {
  color: var(--text-muted);
  margin-bottom: 24px;
}

.card-body p {
  margin-bottom: 14px;
}

.tech-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 20px;
}

.tech-tag {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: var(--text-muted);
  padding: 4px 10px;
  border-radius: 4px;
  font-size: 0.75rem;
  font-family: var(--font-mono);
}

/* 3-Column Tool Cards Grid */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 24px;
}

.tool-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 28px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: var(--transition-smooth);
}

.tool-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-active);
  transform: translateY(-3px);
}

.tool-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

.tool-title {
  font-size: 1.35rem;
  display: flex;
  align-items: center;
  gap: 10px;
}

.stars-badge {
  background: rgba(250, 204, 21, 0.12);
  color: var(--accent-amber);
  border: 1px solid rgba(250, 204, 21, 0.3);
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 0.75rem;
  font-family: var(--font-mono);
}

.tool-links {
  display: flex;
  gap: 12px;
}

.tool-link {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.85rem;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: var(--transition-fast);
}

.tool-link:hover {
  color: var(--accent-cyan);
}

/* Vector Startup Section */
.vector-box {
  background: linear-gradient(145deg, rgba(14, 19, 29, 0.9), rgba(24, 33, 52, 0.6));
  border: 1px solid rgba(0, 242, 254, 0.35);
  border-radius: var(--radius-lg);
  padding: 48px;
  position: relative;
  overflow: hidden;
}

.vector-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 40px;
  align-items: center;
}

.vector-badge {
  background: rgba(16, 185, 129, 0.15);
  color: var(--accent-emerald);
  border: 1px solid rgba(16, 185, 129, 0.4);
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 0.8rem;
  font-family: var(--font-mono);
  display: inline-block;
  margin-bottom: 20px;
}

/* Certifications Section */
.cert-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 32px;
}

.filter-btn {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  color: var(--text-muted);
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  cursor: pointer;
  transition: var(--transition-fast);
}

.filter-btn.active, .filter-btn:hover {
  background: rgba(56, 189, 248, 0.15);
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
}

.certs-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 18px;
}

.cert-card {
  background: rgba(17, 23, 36, 0.6);
  border: 1px solid rgba(56, 189, 248, 0.2);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition-fast);
  display: flex;
  flex-direction: column;
  cursor: pointer;
}

.cert-card:hover {
  background: rgba(24, 33, 52, 0.85);
  border-color: rgba(56, 189, 248, 0.5);
  box-shadow: 0 0 20px rgba(56, 189, 248, 0.15);
  transform: translateY(-4px);
}

.cert-card-header {
  padding: 16px;
  border-bottom: 1px solid rgba(56, 189, 248, 0.2);
  min-height: 88px;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
}

.cert-card-text {
  flex: 1;
}

.cert-name {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 4px;
  line-height: 1.35;
  transition: color 0.2s ease;
}

.cert-card:hover .cert-name {
  color: var(--accent-cyan);
}

.cert-issuer {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.cert-card-ext {
  font-size: 1.1rem;
  color: var(--accent-cyan);
  transition: transform 0.2s ease;
}

.cert-card:hover .cert-card-ext {
  transform: scale(1.2);
}

.cert-preview {
  relative: true;
  position: relative;
  height: 192px;
  background: rgba(0, 0, 0, 0.35);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.cert-preview-img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  transition: transform 0.5s ease;
}

.cert-card:hover .cert-preview-img {
  transform: scale(1.1);
}

.cert-preview-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(5, 7, 11, 0.85), transparent);
  opacity: 0;
  transition: opacity 0.3s ease;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding-bottom: 16px;
}

.cert-card:hover .cert-preview-overlay {
  opacity: 1;
}

.cert-preview-overlay span {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-main);
}

.cert-preview-empty {
  text-align: center;
  padding: 24px;
}

.cert-link {
  color: var(--accent-cyan);
  font-size: 0.85rem;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 600;
}

.cert-link:hover {
  text-decoration: underline;
}

/* Modal / Drawer for Architecture Views */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.85);
  backdrop-filter: blur(8px);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: var(--transition-smooth);
  padding: 24px;
}

.modal-overlay.active {
  opacity: 1;
  pointer-events: all;
}

.modal-box {
  background: var(--bg-surface);
  border: 1px solid var(--border-active);
  border-radius: var(--radius-lg);
  max-width: 800px;
  width: 100%;
  max-height: 85vh;
  overflow-y: auto;
  padding: 36px;
  position: relative;
}

.modal-close {
  position: absolute;
  top: 20px;
  right: 20px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  color: var(--text-main);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  cursor: pointer;
}

/* Footer */
footer {
  border-top: 1px solid var(--border-subtle);
  padding: 60px 0;
  margin-top: 60px;
  background: #05070b;
}

/* Responsive */
@media (max-width: 992px) {
  .hero-grid, .vector-grid {
    grid-template-columns: 1fr;
    gap: 36px;
  }
  .hero-title {
    font-size: 2.75rem;
  }
}

@media (max-width: 640px) {
  .nav-links {
    display: none;
  }
  .hero-title {
    font-size: 2.25rem;
  }
  .tools-grid {
    grid-template-columns: 1fr;
  }
}