/* ============================================================
   KAZAN — Design System v2.0
   Terminal × Glass Morphism
   ============================================================ */

/* ── Google Fonts Pretendard (CDN) ─────────────────────── */
@import url('https://cdn.jsdelivr.net/gh/orioncactus/pretendard@v1.3.9/dist/web/variable/pretendardvariable-dynamic-subset.min.css');
@import url('https://fonts.googleapis.com/css2?family=Fira+Code:wght@400;500&display=swap');

/* ── CSS Custom Properties ──────────────────────────────── */
:root {
  --k-cyan:    #00E5FF;
  --k-purple:  #7C4DFF;
  --k-emerald: #00C896;
  --k-amber:   #FFB300;
  --k-red:     #FF4C6A;

  --k-bg:      #0A0E1A;
  --k-bg-2:    #111728;
  --k-bg-3:    #1A2035;
  --k-glass:   rgba(255, 255, 255, 0.04);
  --k-glass-hover: rgba(255, 255, 255, 0.08);
  --k-border:  rgba(255, 255, 255, 0.08);
  --k-text:    #E8EAF0;
  --k-muted:   rgba(232, 234, 240, 0.55);

  --k-glow-cyan:   0 0 24px rgba(0, 229, 255, 0.25);
  --k-glow-purple: 0 0 24px rgba(124, 77, 255, 0.25);

  --k-radius:  14px;
  --k-radius-sm: 8px;
  --k-font:    'Pretendard Variable', -apple-system, BlinkMacSystemFont, sans-serif;
  --k-mono:    'Fira Code', 'JetBrains Mono', monospace;
}

/* ── MkDocs Variable Override ─────────────────────────── */
[data-md-color-scheme="slate"] {
  --md-default-bg-color:       var(--k-bg);
  --md-default-fg-color:       var(--k-text);
  --md-default-fg-color--light: var(--k-muted);
  --md-primary-fg-color:       var(--k-cyan);
  --md-accent-fg-color:        var(--k-purple);
  --md-code-bg-color:          var(--k-bg-2);
  --md-typeset-a-color:        var(--k-cyan);

  --md-header-bg-color:        rgba(10, 14, 26, 0.85);
}

/* ── Base Resets ────────────────────────────────────────── */
body {
  font-family: var(--k-font) !important;
  background-color: var(--k-bg) !important;
  background-image:
    radial-gradient(ellipse at 20% 10%, rgba(0, 229, 255, 0.06) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 80%, rgba(124, 77, 255, 0.06) 0%, transparent 50%);
  background-attachment: fixed;
}

code, pre, .highlight, .md-typeset code {
  font-family: var(--k-mono) !important;
}

/* ── Header / Nav ───────────────────────────────────────── */
.md-header {
  background: rgba(10, 14, 26, 0.80) !important;
  backdrop-filter: blur(16px) !important;
  -webkit-backdrop-filter: blur(16px) !important;
  border-bottom: 1px solid var(--k-border) !important;
  box-shadow: none !important;
}

.md-header__title {
  font-family: var(--k-mono) !important;
  font-weight: 600;
  letter-spacing: 0.06em;
}

.md-tabs {
  background: transparent !important;
  border-bottom: 1px solid var(--k-border);
}

.md-tabs__link {
  font-family: var(--k-mono) !important;
  font-size: 0.82rem !important;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  opacity: 0.65;
  transition: opacity 0.2s, color 0.2s;
}

.md-tabs__link:hover,
.md-tabs__link--active {
  opacity: 1;
  color: var(--k-cyan) !important;
}

.md-tabs__indicator {
  background-color: var(--k-cyan) !important;
  height: 2px !important;
}

/* ── Content Area ───────────────────────────────────────── */
.md-content__inner {
  max-width: 960px;
}

/* ── Gradient Text ──────────────────────────────────────── */
.text-gradient {
  background: linear-gradient(135deg, #ffffff 0%, var(--k-cyan) 60%, var(--k-purple) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ── Section Eyebrow ────────────────────────────────────── */
.section-eyebrow {
  display: block;
  font-family: var(--k-mono);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--k-cyan);
  margin-bottom: -0.5rem;
  opacity: 0.85;
}

/* ── HERO SECTION ───────────────────────────────────────── */
.hero-section {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 68vh;
  padding: 5rem 0 3rem;
  position: relative;
  gap: 2rem;
}

.hero-content {
  flex: 1;
  max-width: 580px;
}

.hero-eyebrow {
  margin-bottom: 1.5rem;
}

.terminal-badge {
  display: inline-block;
  background: var(--k-bg-2);
  border: 1px solid var(--k-border);
  border-left: 3px solid var(--k-cyan);
  color: var(--k-cyan);
  font-family: var(--k-mono);
  font-size: 0.82rem;
  padding: 0.4rem 1rem;
  border-radius: var(--k-radius-sm);
  letter-spacing: 0.04em;
}

.hero-title {
  font-size: clamp(3.5rem, 8vw, 6rem);
  font-weight: 900;
  line-height: 1;
  letter-spacing: -0.04em;
  margin: 0.5rem 0 1.2rem;
  font-family: var(--k-mono) !important;
}

.hero-subtitle {
  font-size: 1.2rem;
  color: var(--k-muted);
  line-height: 1.6;
  margin-bottom: 2.5rem;
  max-width: 440px;
}

.hero-cta {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 3rem;
}

.hero-stats {
  display: flex;
  gap: 2.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--k-border);
}

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

.stat-num {
  font-family: var(--k-mono);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--k-cyan);
  line-height: 1;
}

.stat-label {
  font-size: 0.75rem;
  color: var(--k-muted);
  margin-top: 0.25rem;
  letter-spacing: 0.04em;
}

/* Hero Visual */
.hero-visual {
  flex: 0 0 300px;
  height: 300px;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.core-glow {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(0,229,255,0.7) 0%, rgba(124,77,255,0.4) 50%, transparent 70%);
  box-shadow: 0 0 60px rgba(0,229,255,0.4), 0 0 120px rgba(124,77,255,0.2);
  animation: pulse-core 3s ease-in-out infinite;
}

.orbit-ring {
  position: absolute;
  width: 240px;
  height: 240px;
  border-radius: 50%;
  border: 1px solid rgba(0, 229, 255, 0.2);
  animation: rotate-orbit 12s linear infinite;
}

.orbit-ring::before {
  content: '';
  position: absolute;
  top: -4px;
  left: 50%;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--k-cyan);
  box-shadow: 0 0 12px var(--k-cyan);
  transform: translateX(-50%);
}

@keyframes pulse-core {
  0%, 100% { transform: scale(1); opacity: 0.9; }
  50% { transform: scale(1.15); opacity: 1; }
}

@keyframes rotate-orbit {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

/* ── BUTTONS ────────────────────────────────────────────── */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: linear-gradient(135deg, var(--k-cyan), var(--k-purple));
  color: #0A0E1A !important;
  font-weight: 700;
  font-size: 0.9rem;
  padding: 0.75rem 1.6rem;
  border-radius: var(--k-radius-sm);
  text-decoration: none !important;
  transition: transform 0.2s, box-shadow 0.2s;
  border: none;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 229, 255, 0.3);
}

.btn-ghost {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: transparent;
  color: var(--k-text) !important;
  font-weight: 600;
  font-size: 0.9rem;
  padding: 0.75rem 1.6rem;
  border-radius: var(--k-radius-sm);
  border: 1px solid var(--k-border);
  text-decoration: none !important;
  transition: border-color 0.2s, color 0.2s, background 0.2s;
}

.btn-ghost:hover {
  border-color: var(--k-cyan);
  color: var(--k-cyan) !important;
  background: rgba(0, 229, 255, 0.05);
}

.btn-ghost-sm {
  display: inline-block;
  color: var(--k-muted) !important;
  font-size: 0.85rem;
  text-decoration: none !important;
  transition: color 0.2s;
}

.btn-ghost-sm:hover {
  color: var(--k-cyan) !important;
}

.btn-download {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(0, 229, 255, 0.1);
  color: var(--k-cyan) !important;
  border: 1px solid rgba(0, 229, 255, 0.3);
  font-weight: 700;
  font-size: 0.88rem;
  padding: 0.65rem 1.2rem;
  border-radius: var(--k-radius-sm);
  text-decoration: none !important;
  transition: all 0.2s;
}

.btn-download:hover {
  background: rgba(0, 229, 255, 0.2);
  box-shadow: var(--k-glow-cyan);
}

/* ── PROJECT CARDS (HOME) ────────────────────────────────── */
.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.25rem;
  margin: 2rem 0;
}

.project-card {
  position: relative;
  display: block;
  background: var(--k-glass);
  border: 1px solid var(--k-border);
  border-radius: var(--k-radius);
  padding: 1.75rem;
  text-decoration: none !important;
  color: var(--k-text) !important;
  overflow: hidden;
  transition: transform 0.25s, border-color 0.25s, box-shadow 0.25s;
  backdrop-filter: blur(8px);
}

.project-card:hover {
  transform: translateY(-4px);
  border-color: rgba(0, 229, 255, 0.4);
  box-shadow: var(--k-glow-cyan);
}

.project-card--featured {
  border-color: rgba(124, 77, 255, 0.3);
}

.project-card--featured:hover {
  border-color: rgba(124, 77, 255, 0.6);
  box-shadow: var(--k-glow-purple);
}

.project-card-glow {
  position: absolute;
  top: -30%;
  right: -20%;
  width: 200px;
  height: 200px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(124,77,255,0.12) 0%, transparent 70%);
  pointer-events: none;
}

.project-card-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}

.project-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin: 0 0 0.75rem;
  color: #fff;
  line-height: 1.3;
}

.project-card p {
  font-size: 0.88rem;
  color: var(--k-muted);
  line-height: 1.65;
  margin-bottom: 1.25rem;
}

.project-arrow {
  font-size: 1.2rem;
  color: var(--k-muted);
  transition: color 0.2s, transform 0.2s;
}

.project-card:hover .project-arrow {
  color: var(--k-cyan);
  transform: translate(2px, -2px);
}

.project-tag {
  display: inline-block;
  font-family: var(--k-mono);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  padding: 0.25rem 0.65rem;
  border-radius: 99px;
}

.project-tag--agent      { background: rgba(124,77,255,0.15); color: #b388ff; border: 1px solid rgba(124,77,255,0.25); }
.project-tag--security   { background: rgba(0,200,150,0.12); color: #00c896; border: 1px solid rgba(0,200,150,0.25); }
.project-tag--orchestration { background: rgba(0,229,255,0.10); color: var(--k-cyan); border: 1px solid rgba(0,229,255,0.2); }
.project-tag--tooling    { background: rgba(255,179,0,0.12); color: var(--k-amber); border: 1px solid rgba(255,179,0,0.25); }

.project-stack {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.project-stack span {
  font-family: var(--k-mono);
  font-size: 0.68rem;
  color: var(--k-muted);
  background: var(--k-bg-3);
  padding: 0.2rem 0.55rem;
  border-radius: 4px;
  border: 1px solid var(--k-border);
}

/* ── SIGNAL LIST (HOME) ─────────────────────────────────── */
.signal-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin: 2rem 0;
}

.signal-item {
  display: block;
  padding: 1.4rem 0;
  border-bottom: 1px solid var(--k-border);
  text-decoration: none !important;
  color: var(--k-text) !important;
  transition: transform 0.2s;
}

.signal-item:first-child {
  border-top: 1px solid var(--k-border);
}

.signal-item:hover {
  transform: translateX(6px);
}

.signal-item:hover h4 {
  color: var(--k-cyan);
}

.signal-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.6rem;
}

.signal-item h4 {
  font-size: 1rem;
  font-weight: 600;
  margin: 0 0 0.4rem;
  line-height: 1.4;
  transition: color 0.2s;
}

.signal-date {
  font-family: var(--k-mono);
  font-size: 0.73rem;
  color: var(--k-muted);
}

.signal-read {
  font-family: var(--k-mono);
  font-size: 0.72rem;
  color: var(--k-muted);
}

.signal-tag {
  display: inline-block;
  font-family: var(--k-mono);
  font-size: 0.68rem;
  font-weight: 600;
  padding: 0.2rem 0.6rem;
  border-radius: 99px;
}

.signal-tag--agent   { background: rgba(124,77,255,0.15); color: #b388ff; }
.signal-tag--security { background: rgba(0,200,150,0.12); color: #00c896; }
.signal-tag--vibe    { background: rgba(0,229,255,0.10); color: var(--k-cyan); }

/* ── TOOLS BANNER (HOME) ────────────────────────────────── */
.tools-banner {
  border: 1px solid var(--k-border);
  border-left: 3px solid var(--k-cyan);
  border-radius: var(--k-radius);
  background: var(--k-glass);
  padding: 1.5rem 2rem;
  margin: 2rem 0;
  backdrop-filter: blur(8px);
}

.tools-banner-content {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.tools-icon {
  font-size: 2rem;
  flex: 0 0 auto;
}

.tools-banner-content > div {
  flex: 1;
}

.tools-banner-content h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin: 0 0 0.3rem;
}

.tools-banner-content p {
  font-size: 0.88rem;
  color: var(--k-muted);
  margin: 0;
}

/* ── STACK GRID (HOME) ──────────────────────────────────── */
.stack-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 0.75rem;
  margin: 2rem 0;
}

.stack-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  padding: 1rem;
  background: var(--k-glass);
  border: 1px solid var(--k-border);
  border-radius: var(--k-radius-sm);
  font-size: 0.82rem;
  color: var(--k-muted);
  text-align: center;
  transition: border-color 0.2s, background 0.2s;
}

.stack-item:hover {
  border-color: rgba(0, 229, 255, 0.3);
  background: var(--k-glass-hover);
}

.stack-icon {
  font-size: 1.5rem;
}

/* ── SECTION FOOTER ─────────────────────────────────────── */
.section-footer {
  text-align: right;
  margin: 1rem 0 3rem;
}

.link-more {
  font-family: var(--k-mono);
  font-size: 0.82rem;
  color: var(--k-cyan) !important;
  text-decoration: none !important;
  opacity: 0.8;
  transition: opacity 0.2s;
}

.link-more:hover { opacity: 1; }

/* ── PAGE HEADER ────────────────────────────────────────── */
.page-header {
  padding: 2.5rem 0 2rem;
  border-bottom: 1px solid var(--k-border);
  margin-bottom: 2.5rem;
}

.page-header h1 {
  font-family: var(--k-mono) !important;
  font-size: 2.8rem;
  font-weight: 900;
  letter-spacing: -0.02em;
  margin: 0.5rem 0 0;
  background: linear-gradient(135deg, #fff 30%, var(--k-cyan) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.page-eyebrow {
  font-family: var(--k-mono);
  font-size: 0.72rem;
  color: var(--k-muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

/* ── FILTER TABS (LAB) ──────────────────────────────────── */
.filter-tabs {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-bottom: 2rem;
}

.filter-btn {
  background: var(--k-glass);
  border: 1px solid var(--k-border);
  color: var(--k-muted);
  font-family: var(--k-mono);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  padding: 0.4rem 1rem;
  border-radius: 99px;
  cursor: pointer;
  transition: all 0.2s;
}

.filter-btn:hover,
.filter-btn.active {
  background: rgba(0, 229, 255, 0.1);
  border-color: rgba(0, 229, 255, 0.4);
  color: var(--k-cyan);
}

/* ── LAB GRID ────────────────────────────────────────────── */
.lab-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.25rem;
}

.lab-card {
  position: relative;
  display: block;
  background: var(--k-glass);
  border: 1px solid var(--k-border);
  border-radius: var(--k-radius);
  overflow: hidden;
  text-decoration: none !important;
  color: var(--k-text) !important;
  transition: transform 0.25s, box-shadow 0.25s;
  backdrop-filter: blur(8px);
}

.lab-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.4);
}

.lab-card-accent {
  height: 3px;
  background: linear-gradient(90deg, var(--accent, var(--k-cyan)), transparent);
}

.lab-card-body {
  padding: 1.75rem;
}

.lab-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}

.lab-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: #fff;
  margin: 0 0 0.75rem;
  line-height: 1.35;
}

.lab-card p {
  font-size: 0.875rem;
  color: var(--k-muted);
  line-height: 1.65;
  margin-bottom: 1.25rem;
}

.lab-arrow {
  font-size: 1.1rem;
  color: var(--k-muted);
  transition: color 0.2s, transform 0.2s;
}

.lab-card:hover .lab-arrow {
  color: var(--k-cyan);
  transform: translate(2px, -2px);
}

.lab-tag {
  display: inline-block;
  font-family: var(--k-mono);
  font-size: 0.68rem;
  font-weight: 600;
  padding: 0.2rem 0.65rem;
  border-radius: 99px;
}

.lab-tag--agent        { background: rgba(124,77,255,0.15); color: #b388ff; border: 1px solid rgba(124,77,255,0.2); }
.lab-tag--security     { background: rgba(0,200,150,0.12); color: #00c896; border: 1px solid rgba(0,200,150,0.2); }
.lab-tag--orchestration { background: rgba(0,229,255,0.10); color: var(--k-cyan); border: 1px solid rgba(0,229,255,0.15); }
.lab-tag--tooling      { background: rgba(255,179,0,0.12); color: var(--k-amber); border: 1px solid rgba(255,179,0,0.2); }
.lab-tag--network      { background: rgba(255,76,106,0.12); color: var(--k-red); border: 1px solid rgba(255,76,106,0.2); }

.lab-stack {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.lab-stack span {
  font-family: var(--k-mono);
  font-size: 0.68rem;
  color: var(--k-muted);
  background: var(--k-bg-3);
  padding: 0.2rem 0.55rem;
  border-radius: 4px;
  border: 1px solid var(--k-border);
}

/* ── TOOLS PAGE ──────────────────────────────────────────── */
.tools-grid {
  display: grid;
  gap: 2rem;
  margin: 2rem 0;
}

.tool-card {
  background: var(--k-glass);
  border: 1px solid var(--k-border);
  border-radius: var(--k-radius);
  padding: 2.25rem;
  backdrop-filter: blur(8px);
}

.tool-card-header {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  margin-bottom: 1.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--k-border);
}

.tool-icon {
  font-size: 2.5rem;
  flex: 0 0 auto;
}

.tool-card-header h2 {
  font-size: 1.4rem;
  font-weight: 800;
  margin: 0 0 0.3rem;
  color: #fff;
}

.tool-version {
  font-family: var(--k-mono);
  font-size: 0.72rem;
  color: var(--k-emerald);
  background: rgba(0, 200, 150, 0.1);
  border: 1px solid rgba(0, 200, 150, 0.2);
  padding: 0.2rem 0.6rem;
  border-radius: 99px;
}

.tool-desc {
  font-size: 0.92rem;
  color: var(--k-muted);
  line-height: 1.7;
  margin-bottom: 1.5rem;
}

.tool-features {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}

.tool-feature {
  font-size: 0.84rem;
  color: var(--k-text);
}

.tool-files {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 2rem;
  padding: 1rem;
  background: var(--k-bg-2);
  border-radius: var(--k-radius-sm);
  border: 1px solid var(--k-border);
}

.tool-file {
  font-family: var(--k-mono);
  font-size: 0.78rem;
  color: var(--k-muted);
  padding: 0.2rem 0.6rem;
  background: var(--k-bg-3);
  border-radius: 4px;
}

.tool-file code {
  color: var(--k-cyan) !important;
  background: transparent !important;
  padding: 0 !important;
}

.tool-actions {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: wrap;
  margin-bottom: 1.5rem;
}

.btn-download-main {
  font-size: 0.95rem;
  padding: 0.85rem 1.75rem;
  border-radius: var(--k-radius-sm);
  transition: all 0.2s;
}

.btn-meta {
  font-family: var(--k-mono);
  font-size: 0.7rem;
  opacity: 0.7;
  margin-left: 0.25rem;
}

.tool-hash {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  background: var(--k-bg-2);
  border-radius: var(--k-radius-sm);
  border: 1px solid var(--k-border);
}

.tool-hash > span {
  font-family: var(--k-mono);
  font-size: 0.7rem;
  color: var(--k-muted);
  flex: 0 0 auto;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.tool-hash code {
  font-size: 0.7rem !important;
  color: var(--k-muted) !important;
  word-break: break-all;
  background: transparent !important;
  padding: 0 !important;
}

/* ── ABOUT PAGE ─────────────────────────────────────────── */
.about-hero {
  display: flex;
  align-items: center;
  gap: 2.5rem;
  padding: 3rem 0;
  flex-wrap: wrap;
}

.about-avatar-wrap {
  position: relative;
  flex: 0 0 auto;
  width: 96px;
  height: 96px;
}

.about-avatar {
  width: 96px;
  height: 96px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--k-cyan), var(--k-purple));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.5rem;
  font-weight: 900;
  font-family: var(--k-mono);
  color: var(--k-bg);
  position: relative;
  z-index: 1;
}

.about-avatar-ring {
  position: absolute;
  inset: -6px;
  border-radius: 50%;
  border: 1px solid rgba(0, 229, 255, 0.3);
  animation: rotate-orbit 6s linear infinite;
}

.about-intro h1 {
  font-size: 2.2rem;
  font-weight: 900;
  margin: 0 0 0.4rem;
}

.about-tagline {
  font-family: var(--k-mono);
  font-size: 0.88rem;
  color: var(--k-cyan);
  margin-bottom: 1rem;
}

.about-bio {
  font-size: 0.95rem;
  color: var(--k-muted);
  line-height: 1.7;
  max-width: 480px;
  margin-bottom: 1.5rem;
}

.about-links {
  display: flex;
  gap: 1rem;
}

.about-link {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--k-muted) !important;
  text-decoration: none !important;
  font-size: 0.85rem;
  font-weight: 600;
  transition: color 0.2s;
}

.about-link svg {
  width: 16px;
  height: 16px;
}

.about-link:hover {
  color: var(--k-cyan) !important;
}

.principles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.25rem;
  margin: 2rem 0;
}

.principle-card {
  background: var(--k-glass);
  border: 1px solid var(--k-border);
  border-radius: var(--k-radius);
  padding: 1.75rem;
  backdrop-filter: blur(8px);
}

.principle-icon {
  font-size: 2rem;
  margin-bottom: 0.75rem;
}

.principle-card h4 {
  font-size: 1rem;
  font-weight: 700;
  margin: 0 0 0.6rem;
  color: #fff;
}

.principle-card p {
  font-size: 0.85rem;
  color: var(--k-muted);
  line-height: 1.65;
  margin: 0;
}

/* ── Footer ─────────────────────────────────────────────── */
.md-footer {
  background: var(--k-bg-2) !important;
  border-top: 1px solid var(--k-border) !important;
}

/* ── Sidebar Nav ────────────────────────────────────────── */
.md-nav__link--active {
  color: var(--k-cyan) !important;
}

.md-nav__indicator {
  color: var(--k-cyan);
}

/* ── Tables ─────────────────────────────────────────────── */
.md-typeset table:not([class]) {
  border: 1px solid var(--k-border) !important;
  border-radius: var(--k-radius-sm);
  overflow: hidden;
}

.md-typeset table:not([class]) th {
  background: var(--k-bg-2) !important;
  font-family: var(--k-mono);
  font-size: 0.78rem;
  letter-spacing: 0.05em;
}

/* ── Admonitions ─────────────────────────────────────────── */
.md-typeset .admonition {
  border-radius: var(--k-radius-sm);
  background: var(--k-glass) !important;
  border-left: 3px solid var(--k-cyan);
}

/* ── Code Blocks ─────────────────────────────────────────── */
.md-typeset pre {
  border: 1px solid var(--k-border);
  border-radius: var(--k-radius-sm) !important;
}

/* ── Responsive ──────────────────────────────────────────── */
@media (max-width: 768px) {
  .hero-section {
    flex-direction: column;
    min-height: auto;
    padding: 3rem 0 2rem;
  }

  .hero-visual {
    display: none;
  }

  .tool-features {
    grid-template-columns: 1fr;
  }

  .about-hero {
    flex-direction: column;
    text-align: center;
  }

  .about-links {
    justify-content: center;
  }
}

/* ============================================================
   3D CARD STACK & VERTICAL COVERFLOW UI (Reference Style)
   ============================================================ */

.stack-carousel-section {
  position: relative;
  margin: 3.5rem 0 5rem;
  padding: 1rem 0;
}

.stack-carousel-controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 2rem;
  gap: 1rem;
  flex-wrap: wrap;
}

.stack-carousel-title-group h2 {
  margin: 0 !important;
  font-size: 2rem !important;
  font-weight: 800 !important;
  letter-spacing: -0.03em;
}

.stack-carousel-nav {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--k-glass);
  border: 1px solid var(--k-border);
  backdrop-filter: blur(12px);
  padding: 0.35rem 0.6rem;
  border-radius: 999px;
}

.stack-nav-btn {
  background: transparent;
  border: none;
  color: var(--k-text);
  width: 34px;
  height: 34px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
  font-size: 0.9rem;
}

.stack-nav-btn:hover {
  background: rgba(255, 255, 255, 0.15);
  color: var(--k-cyan);
  transform: scale(1.08);
}

.stack-nav-counter {
  font-family: var(--k-mono);
  font-size: 0.82rem;
  font-weight: 600;
  padding: 0 0.5rem;
  color: var(--k-muted);
  letter-spacing: 0.1em;
}

.stack-nav-counter .active-num {
  color: var(--k-cyan);
}

/* --- 3D Stacking Viewport --- */
.stack-viewport {
  position: relative;
  perspective: 1600px;
  perspective-origin: 50% 20%;
  transform-style: preserve-3d;
  padding: 1.5rem 0 4rem;
}

.stack-cards-deck {
  display: flex;
  flex-direction: column;
  gap: 3.5rem;
  position: relative;
}

/* Individual Stack Card */
.stack-card {
  position: sticky;
  top: calc(90px + var(--card-index, 0) * 16px);
  width: 100%;
  max-width: 900px;
  margin: 0 auto;
  border-radius: 24px;
  padding: 2.2rem 2.6rem;
  text-decoration: none !important;
  display: block;
  color: inherit;
  overflow: hidden;
  will-change: transform, box-shadow;
  transform: rotateZ(var(--tilt-angle, 0deg)) rotateX(var(--tilt-x, 0deg)) translateZ(0);
  transition: transform 0.45s cubic-bezier(0.16, 1, 0.3, 1),
              box-shadow 0.45s ease,
              filter 0.35s ease;
  box-shadow: 0 20px 50px -10px rgba(0, 0, 0, 0.7),
              0 0 0 1px rgba(255, 255, 255, 0.12);
  z-index: calc(10 + var(--card-index, 0));
}

/* Subtle corner bolt/indicator like reference image */
.stack-card::before {
  content: '';
  position: absolute;
  top: 18px;
  right: 20px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: currentColor;
  opacity: 0.4;
  box-shadow: 0 0 8px currentColor;
}

.stack-card:hover {
  transform: rotateZ(0deg) rotateX(0deg) translateY(-8px) scale(1.015) !important;
  box-shadow: 0 35px 80px -15px rgba(0, 0, 0, 0.85),
              0 0 0 1px var(--k-cyan);
  z-index: 50 !important;
}

/* Card Header */
.stack-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 1.2rem;
  margin-bottom: 1.5rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  font-family: var(--k-mono);
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.stack-card-index {
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
}

.stack-card-date {
  opacity: 0.7;
}

/* Card Body */
.stack-card-body {
  margin-bottom: 2rem;
}

.stack-card-title {
  font-size: 1.85rem !important;
  font-weight: 800 !important;
  line-height: 1.25 !important;
  margin: 0 0 1rem !important;
  letter-spacing: -0.025em;
}

.stack-card-desc {
  font-size: 1rem;
  line-height: 1.6;
  opacity: 0.85;
  margin: 0 0 1.5rem;
  max-width: 720px;
}

/* Card Metrics Grid (Inspired by Reference Image 4.1 METRICS) */
.stack-card-metrics {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 1rem;
  margin: 1.5rem 0 0.5rem;
  padding: 1rem 1.2rem;
  border-radius: 14px;
  background: rgba(0, 0, 0, 0.15);
  border: 1px solid rgba(255, 255, 255, 0.06);
}

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

.stack-metric-label {
  font-family: var(--k-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  opacity: 0.65;
  margin-bottom: 0.2rem;
}

.stack-metric-value {
  font-family: var(--k-mono);
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

/* Card Footer */
.stack-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 1.2rem;
  font-size: 0.85rem;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.stack-card-tags {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
}

.stack-card-tag {
  font-family: var(--k-mono);
  font-size: 0.72rem;
  padding: 0.25rem 0.6rem;
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.1);
  letter-spacing: 0.02em;
}

.stack-card-action {
  font-family: var(--k-mono);
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  transition: transform 0.2s ease;
}

.stack-card:hover .stack-card-action {
  transform: translateX(4px);
}

/* ============================================================
   THEME VARIANTS (Matching the uploaded reference aesthetics)
   ============================================================ */

/* Theme 1: High-Tech Cyber Dark (#0D111A) */
.stack-theme-cyber {
  background: linear-gradient(135deg, #0A0E17 0%, #111726 100%);
  color: #F0F4FC;
  border: 1px solid rgba(0, 229, 255, 0.2);
}

.stack-theme-cyber .stack-card-index {
  color: #00E5FF;
}

.stack-theme-cyber .stack-card-action {
  color: #00E5FF;
}

.stack-theme-cyber .stack-metric-value {
  color: #00E5FF;
}

/* Theme 2: Bold Flame Red / Orange (Ref: Big Red "Voteform" Card) */
.stack-theme-flame {
  background: linear-gradient(135deg, #FF3823 0%, #E02814 60%, #B81D0D 100%);
  color: #FFFFFF;
  border: 1px solid rgba(255, 255, 255, 0.25);
  box-shadow: 0 25px 60px -10px rgba(224, 40, 20, 0.5),
              0 0 0 1px rgba(255, 255, 255, 0.2);
}

.stack-theme-flame .stack-card-header {
  border-bottom-color: rgba(255, 255, 255, 0.2);
}

.stack-theme-flame .stack-card-metrics {
  background: rgba(0, 0, 0, 0.22);
  border-color: rgba(255, 255, 255, 0.15);
}

.stack-theme-flame .stack-card-tag {
  background: rgba(0, 0, 0, 0.3);
  color: #FFFFFF;
}

.stack-theme-flame .stack-card-footer {
  border-top-color: rgba(255, 255, 255, 0.2);
}

.stack-theme-flame .stack-card-action {
  color: #FFFFFF;
}

/* Theme 3: Pure Minimal White / Silver (Ref: White "Process / Gap" Card) */
.stack-theme-light {
  background: linear-gradient(145deg, #FFFFFF 0%, #F1F3F5 100%);
  color: #12161F;
  border: 1px solid rgba(0, 0, 0, 0.08);
  box-shadow: 0 25px 60px -10px rgba(0, 0, 0, 0.4),
              0 0 0 1px rgba(255, 255, 255, 0.8);
}

.stack-theme-light .stack-card-header {
  border-bottom-color: rgba(0, 0, 0, 0.1);
  color: #4A5568;
}

.stack-theme-light .stack-card-index {
  color: #0F172A;
  font-weight: 800;
}

.stack-theme-light .stack-card-desc {
  color: #475569;
}

.stack-theme-light .stack-card-metrics {
  background: rgba(0, 0, 0, 0.04);
  border-color: rgba(0, 0, 0, 0.08);
}

.stack-theme-light .stack-metric-label {
  color: #64748B;
}

.stack-theme-light .stack-metric-value {
  color: #0F172A;
}

.stack-theme-light .stack-card-tag {
  background: rgba(0, 0, 0, 0.07);
  color: #1E293B;
}

.stack-theme-light .stack-card-footer {
  border-top-color: rgba(0, 0, 0, 0.1);
}

.stack-theme-light .stack-card-action {
  color: #0F172A;
}

/* Responsive adjustments */
@media (max-width: 768px) {
  .stack-card {
    padding: 1.5rem 1.4rem;
    border-radius: 18px;
    transform: none !important;
    top: calc(75px + var(--card-index, 0) * 8px);
  }

  .stack-card-title {
    font-size: 1.4rem !important;
  }

  .stack-card-metrics {
    grid-template-columns: repeat(2, 1fr);
  }
}