/* =========================================================
   TOKENS
   ========================================================= */

:root {
  --bg:           #FAFAFA;
  --bg-card:      #FFFFFF;
  --bg-soft:      #F4F4F5;
  --border:       #E4E4E7;
  --border-hover: #C4C4C7;
  --text:         #09090B;
  --text-muted:   #71717A;
  --text-subtle:  #A1A1AA;
  --accent:       #09090B;
  --accent-fg:    #FAFAFA;
  --green:        #16A34A;
  --radius:       14px;
  --radius-sm:    9px;
  --max-w:        1080px;
}

[data-dark] {
  --bg:           #09090B;
  --bg-card:      #111113;
  --bg-soft:      #18181B;
  --border:       #27272A;
  --border-hover: #3F3F46;
  --text:         #FAFAFA;
  --text-muted:   #A1A1AA;
  --text-subtle:  #52525B;
  --accent:       #FAFAFA;
  --accent-fg:    #09090B;
  --green:        #4ADE80;
}

/* =========================================================
   RESET
   ========================================================= */

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; -webkit-font-smoothing: antialiased; }

body {
  font-family: 'Plus Jakarta Sans', system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  transition: background 0.2s ease, color 0.2s ease;
}

a { color: inherit; text-decoration: none; }
ul { list-style: none; }

/* =========================================================
   SHARED LAYOUT
   ========================================================= */

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

/* =========================================================
   TOPNAV
   ========================================================= */

.topnav {
  padding: 28px 0 0;
}

.topnav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.topnav-brand {
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-subtle);
  letter-spacing: -0.01em;
  text-decoration: none;
  transition: color 0.15s;
}

.topnav-brand:hover { color: var(--text-muted); }

.dark-toggle {
  background: none;
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-subtle);
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  flex-shrink: 0;
  transition: border-color 0.15s, color 0.15s;
}

.dark-toggle:hover {
  border-color: var(--border-hover);
  color: var(--text-muted);
}

/* =========================================================
   PAGE HERO (big heading)
   ========================================================= */

.hero {
  padding: 56px 0 52px;
}

.hero-title {
  font-size: clamp(2.6rem, 7vw, 4.5rem);
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: -0.04em;
  color: var(--text);
}

.hero-title em {
  font-style: normal;
  color: var(--text-subtle);
}

.hero-name-link {
  color: inherit;
  text-decoration: underline;
  text-underline-offset: 5px;
}

/* =========================================================
   TWO-COLUMN LAYOUT
   ========================================================= */

.page-cols {
  display: grid;
  grid-template-columns: 3fr 2fr;
  gap: 48px;
  align-items: start;
  padding-bottom: 60px;
  border-top: 1px solid var(--border);
  padding-top: 36px;
}

.page-col {
  display: flex;
  flex-direction: column;
}

.blogs-row {
  padding-bottom: 80px;
  border-top: 1px solid var(--border);
  padding-top: 32px;
}

.section-label {
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: 20px;
  display: block;
}

/* =========================================================
   PROJECT CARD
   ========================================================= */

.project-card {
  display: block;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  cursor: pointer;
  text-decoration: none;
  outline: none;
  transition:
    border-color 0.18s ease,
    box-shadow 0.18s ease,
    transform 0.22s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.project-card:hover {
  border-color: var(--border-hover);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
  transform: translateY(-2px);
}

[data-dark] .project-card:hover {
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
}

.coming-soon-card {
  opacity: 0.6;
  pointer-events: none;
}

.coming-soon-card:hover {
  transform: none;
  box-shadow: none;
  border-color: var(--border);
}

.project-card:focus-visible {
  outline: 2px solid var(--border-hover);
  outline-offset: 3px;
}

.card-badge {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 14px;
}

.status-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--green);
}

.status-text {
  font-size: 0.65rem;
  font-weight: 600;
  color: var(--green);
  text-transform: uppercase;
  letter-spacing: 0.07em;
}

.card-title {
  font-size: 1.35rem;
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.025em;
  color: var(--text);
  margin-bottom: 10px;
}

.card-desc {
  font-size: 0.875rem;
  line-height: 1.75;
  color: var(--text-muted);
  font-weight: 400;
  margin-bottom: 18px;
}

.card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.card-meta {
  font-size: 0.7rem;
  color: var(--text-subtle);
}

.card-arrow {
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: color 0.15s, transform 0.15s;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.project-card:hover .card-arrow {
  color: var(--text);
  transform: translateX(2px);
}

/* =========================================================
   CATEGORY GROUPS
   ========================================================= */

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

.category-tag {
  display: inline-flex;
  align-items: center;
  font-size: 0.62rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  border-radius: 5px;
  padding: 3px 9px;
  margin-bottom: 10px;
}

.cat-probability {
  background: rgba(124, 58, 237, 0.08);
  color: #7C3AED;
  border: 1px solid rgba(124, 58, 237, 0.2);
}

[data-dark] .cat-probability {
  background: rgba(167, 139, 250, 0.1);
  color: #A78BFA;
  border-color: rgba(167, 139, 250, 0.25);
}

.cat-social {
  background: rgba(5, 150, 105, 0.08);
  color: #059669;
  border: 1px solid rgba(5, 150, 105, 0.2);
}

[data-dark] .cat-social {
  background: rgba(52, 211, 153, 0.1);
  color: #34D399;
  border-color: rgba(52, 211, 153, 0.25);
}

.cat-cognitive {
  background: rgba(239, 68, 68, 0.07);
  color: #DC2626;
  border: 1px solid rgba(239, 68, 68, 0.2);
}

[data-dark] .cat-cognitive {
  background: rgba(252, 165, 165, 0.1);
  color: #FCA5A5;
  border-color: rgba(252, 165, 165, 0.25);
}

/* =========================================================
   EMPTY STATE (no blogs, etc.)
   ========================================================= */

.empty-state {
  padding: 20px 0 4px;
  color: var(--text-subtle);
  font-size: 0.85rem;
}

/* =========================================================
   BACK NAV (project / blog pages)
   ========================================================= */

.back-nav {
  padding: 28px 0 0;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-subtle);
  text-decoration: none;
  transition: color 0.15s;
}

.back-link:hover { color: var(--text-muted); }

/* =========================================================
   PROJECT DETAIL PAGE
   ========================================================= */

.project-hero {
  padding: 40px 0 36px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 36px;
}

.project-hero-top {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
}

.project-version {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.65rem;
  color: var(--text-subtle);
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 2px 8px;
}

.project-title {
  font-size: clamp(1.8rem, 5vw, 3rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.035em;
  color: var(--text);
  margin-bottom: 14px;
}

.project-tagline {
  font-size: 1rem;
  line-height: 1.7;
  color: var(--text-muted);
  max-width: 520px;
}

.project-layout {
  display: grid;
  grid-template-columns: 1fr 200px;
  gap: 48px;
  padding-bottom: 64px;
}

.project-main {}

.detail-section {
  margin-bottom: 32px;
}

.detail-label {
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-subtle);
  margin-bottom: 10px;
  display: block;
}

.detail-body {
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--text-muted);
}

.project-sidebar {}

.stack-list {
  display: flex;
  flex-direction: column;
  gap: 5px;
  margin-bottom: 28px;
}

.stack-list li {
  font-size: 0.75rem;
  color: var(--text-muted);
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 5px 10px;
  width: fit-content;
}

.meta-list {
  display: flex;
  flex-direction: column;
  gap: 9px;
  margin-bottom: 28px;
}

.meta-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
}

.meta-key { font-size: 0.7rem; color: var(--text-subtle); }
.meta-val { font-size: 0.7rem; color: var(--text-muted); }

.project-actions {
  display: flex;
  gap: 8px;
  margin-top: 32px;
}

/* =========================================================
   BUTTONS
   ========================================================= */

.btn {
  font-family: 'Plus Jakarta Sans', system-ui, sans-serif;
  font-size: 0.8rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
  padding: 9px 18px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border: 1px solid transparent;
  text-decoration: none;
  letter-spacing: -0.01em;
  transition: opacity 0.15s, border-color 0.15s, color 0.15s, background 0.15s;
}

.btn-primary {
  background: var(--accent);
  color: var(--accent-fg);
  border-color: var(--accent);
}

.btn-primary:hover { opacity: 0.8; }

.btn-ghost {
  background: transparent;
  color: var(--text-muted);
  border-color: var(--border);
}

.btn-ghost:hover {
  border-color: var(--border-hover);
  color: var(--text);
}

/* =========================================================
   SCROLLBAR
   ========================================================= */

::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }

/* =========================================================
   RESPONSIVE
   ========================================================= */

@media (max-width: 860px) {
  .page-cols { grid-template-columns: 1fr; gap: 0; }
  .page-col { padding-bottom: 40px; }
  .page-col + .page-col { border-top: 1px solid var(--border); padding-top: 40px; }
}

@media (max-width: 600px) {
  .container { padding: 0 18px; }
  .hero { padding: 36px 0 36px; }
  .hero-title { letter-spacing: -0.03em; }
  .project-layout { grid-template-columns: 1fr; gap: 32px; }
  .project-sidebar { order: -1; }
  .project-actions { flex-direction: column; }
  .stack-list { flex-direction: row; flex-wrap: wrap; }
}