/* ═══════════════════════════════════════════════════════════════
   WALEED SABIR — PORTFOLIO DESIGN SYSTEM
   Swiss Minimalism × Data Analytics Interface
   ═══════════════════════════════════════════════════════════════ */

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

/* ─── DESIGN TOKENS ──────────────────────────────────────────────── */
:root {
  /* Surfaces */
  --void:          #090A0F;
  --slate:         #12131A;
  --surface:       #171922;
  --surface-alt:   #1C1F2A;

  /* Borders */
  --border:        rgba(255,255,255,0.08);
  --border-hover:  rgba(255,255,255,0.18);
  --border-active: rgba(255,255,255,0.28);

  /* Text */
  --text-primary:   #F5F7FA;
  --text-secondary: #8B909B;
  --text-muted:     #4E5260;

  /* Functional accents — use sparingly */
  --emerald: #10B981;
  --cyan:    #06B6D4;

  /* Typography */
  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  /* Geometry */
  --radius-sm: 8px;
  --radius:    14px;
  --radius-lg: 18px;

  /* Motion */
  --ease:  150ms ease;
  --ease-m: 280ms ease;
}

/* ─── RESET ──────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html  { scroll-behavior: smooth; }
body  {
  background:  var(--void);
  color:       var(--text-primary);
  font-family: var(--font-sans);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; }

/* ─── LAYOUT ─────────────────────────────────────────────────────── */
.container {
  max-width: 1400px;
  margin: 0 auto;
  padding-inline: 48px;
}
.section        { padding-block: 80px; }
.section-border { border-top: 1px solid var(--border); }

/* ─── SECTION DIVIDER ────────────────────────────────────────────── */
.section-divider {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 40px;
}
.section-divider__num {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.1em;
  color: var(--text-muted);
}
.section-divider__name {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--text-secondary);
  white-space: nowrap;
}
.section-divider__line {
  flex: 1;
  height: 1px;
  background: var(--border);
}

/* ─── TYPOGRAPHY UTILITIES ───────────────────────────────────────── */
.mono   { font-family: var(--font-mono); }
.hero-name {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 700;
  letter-spacing: -0.04em;
  line-height: 1;
  color: var(--text-primary);
  margin-bottom: 8px;
}
.label  {
  font-family:     var(--font-mono);
  font-size:       0.6rem;
  letter-spacing:  0.18em;
  text-transform:  uppercase;
  color:           var(--text-secondary);
}
.eyebrow {
  font-family:    var(--font-mono);
  font-size:      0.7rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color:          var(--text-secondary);
}

/* ─── NAVIGATION ─────────────────────────────────────────────────── */
#site-nav {
  position:      fixed;
  inset:         0 0 auto;
  z-index:       100;
  border-bottom: 1px solid transparent;
  transition:    background var(--ease), border-color var(--ease), backdrop-filter var(--ease);
}
#site-nav.scrolled {
  background:            rgba(9,10,15,0.9);
  backdrop-filter:       blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom-color:   var(--border);
}
.nav-inner {
  display:         flex;
  align-items:     center;
  justify-content: space-between;
  height:          56px;
  max-width:       1400px;
  margin:          0 auto;
  padding-inline:  48px;
  gap:             32px;
}
.nav-brand {
  font-family:    var(--font-mono);
  font-size:      0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color:          var(--text-primary);
  flex-shrink:    0;
}
.nav-links {
  display:     flex;
  align-items: center;
  gap:         36px;
  list-style:  none;
}
.nav-links a {
  font-family:    var(--font-mono);
  font-size:      0.6rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color:          var(--text-secondary);
  transition:     color var(--ease);
}
.nav-links a:hover { color: var(--text-primary); }

.nav-status {
  display:     flex;
  align-items: center;
  gap:         7px;
  font-family:    var(--font-mono);
  font-size:      0.6rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color:          var(--emerald);
  white-space:    nowrap;
}
.status-dot {
  width:         5px;
  height:        5px;
  border-radius: 50%;
  background:    var(--emerald);
  animation:     pulse-dot 2.8s ease-in-out infinite;
  flex-shrink:   0;
}
@keyframes pulse-dot {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0.3; }
}

.nav-hamburger {
  display:    none;
  background: none;
  border:     none;
  cursor:     pointer;
  color:      var(--text-secondary);
  padding:    4px;
  transition: color var(--ease);
}
.nav-hamburger:hover { color: var(--text-primary); }

/* Mobile nav overlay */
#nav-mobile {
  display:       none;
  position:      fixed;
  top:           56px;
  inset-inline:  0;
  background:    rgba(18,19,26,0.98);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  z-index:       99;
  padding:       24px 48px;
  flex-direction: column;
  gap:           20px;
}
#nav-mobile.open { display: flex; }
#nav-mobile a {
  font-family:    var(--font-mono);
  font-size:      0.8rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color:          var(--text-secondary);
  transition:     color var(--ease);
}
#nav-mobile a:hover { color: var(--text-primary); }

/* ─── CARDS ──────────────────────────────────────────────────────── */
.card {
  background:    var(--slate);
  border:        1px solid var(--border);
  border-radius: var(--radius);
  transition:    border-color var(--ease);
}
.card-surface {
  background:    var(--surface);
  border:        1px solid var(--border);
  border-radius: var(--radius-sm);
}

/* ─── BADGES ─────────────────────────────────────────────────────── */
.badge {
  display:        inline-flex;
  align-items:    center;
  font-family:    var(--font-mono);
  font-size:      0.565rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  padding:        3px 8px;
  border-radius:  3px;
  border:         1px solid var(--border);
  color:          var(--text-secondary);
  white-space:    nowrap;
}
.badge--amber {
  color:       #F59E0B;
  border-color: rgba(245,158,11,0.3);
  background:  rgba(245,158,11,0.05);
}

/* ─── TECH TAGS ──────────────────────────────────────────────────── */
.tech-tag {
  display:        inline-flex;
  align-items:    center;
  font-family:    var(--font-mono);
  font-size:      0.6rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding:        4px 9px;
  border-radius:  4px;
  border:         1px solid var(--border);
  color:          var(--text-secondary);
  background:     var(--surface);
  white-space:    nowrap;
  transition:     border-color var(--ease), color var(--ease);
  user-select:    none;
}
.tech-tag:hover {
  border-color: var(--border-hover);
  color:        var(--text-primary);
}
.tech-tags-row {
  display:   flex;
  flex-wrap: wrap;
  gap:       6px;
}

/* ─── BUTTONS ────────────────────────────────────────────────────── */
.btn {
  display:        inline-flex;
  align-items:    center;
  gap:            6px;
  font-family:    var(--font-mono);
  font-size:      0.6rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding:        8px 16px;
  border-radius:  6px;
  border:         1px solid var(--border);
  color:          var(--text-secondary);
  background:     transparent;
  cursor:         pointer;
  transition:     border-color var(--ease), color var(--ease), background var(--ease), opacity var(--ease);
  white-space:    nowrap;
}
.btn:hover {
  border-color: var(--border-hover);
  color:        var(--text-primary);
}
.btn--primary {
  color:        var(--cyan);
  border-color: rgba(6,182,212,0.35);
  background:   rgba(6,182,212,0.05);
}
.btn--primary:hover {
  border-color: rgba(6,182,212,0.65);
  background:   rgba(6,182,212,0.10);
}
.btn--disabled {
  opacity:        0.35;
  pointer-events: none;
}

/* ─── EXPAND / COLLAPSE ──────────────────────────────────────────── */
.expand-trigger {
  display:         flex;
  align-items:     center;
  justify-content: space-between;
  width:           100%;
  padding:         15px 24px;
  background:      none;
  border:          none;
  cursor:          pointer;
  font-family:     var(--font-mono);
  font-size:       0.6rem;
  letter-spacing:  0.14em;
  text-transform:  uppercase;
  color:           var(--text-secondary);
  transition:      color var(--ease), background var(--ease);
  text-align:      left;
  gap:             12px;
}
.expand-trigger:hover {
  color:      var(--text-primary);
  background: rgba(255,255,255,0.02);
}
.expand-trigger__text { flex: 1; }
.expand-trigger__hint {
  font-family:    var(--font-mono);
  font-size:      0.55rem;
  letter-spacing: 0.1em;
  color:          var(--text-muted);
}
.expand-trigger__icon {
  flex-shrink: 0;
  transition:  transform var(--ease-m);
  color:       var(--text-muted);
}
.expand-trigger[aria-expanded="true"] .expand-trigger__icon {
  transform: rotate(180deg);
}

/* Grid-rows animation for expand/collapse */
.expand-panel {
  display:              grid;
  grid-template-rows:   0fr;
  transition:           grid-template-rows 340ms ease;
}
.expand-panel.open { grid-template-rows: 1fr; }
.expand-panel__inner { overflow: hidden; }

.expand-divider { border-top: 1px solid var(--border); }

/* ─── PIPELINE SVG ───────────────────────────────────────────────── */
.pipe-node-rect {
  fill:       var(--surface);
  stroke:     var(--border);
  stroke-width: 1;
  transition: stroke var(--ease), fill var(--ease);
}
.pipe-node:hover .pipe-node-rect,
.pipe-node:focus-visible .pipe-node-rect {
  stroke: rgba(6,182,212,0.45);
  fill:   rgba(6,182,212,0.04);
}
.pipe-node-text {
  fill:            var(--text-secondary);
  font-family:     var(--font-mono);
  font-size:       7.5px;
  letter-spacing:  0.09em;
  pointer-events:  none;
  transition:      fill var(--ease);
}
.pipe-node:hover .pipe-node-text,
.pipe-node:focus-visible .pipe-node-text { fill: var(--text-primary); }

.pipe-line {
  stroke:           rgba(6,182,212,0.35);
  stroke-width:     1;
  fill:             none;
  stroke-dasharray: 3 4;
  animation:        pipe-flow 2.5s linear infinite;
}
@keyframes pipe-flow {
  from { stroke-dashoffset: 28; }
  to   { stroke-dashoffset: 0; }
}

/* ─── SCHEMA SVG ─────────────────────────────────────────────────── */
.schema-node { cursor: pointer; outline: none; }
.schema-node rect {
  fill:       var(--surface);
  stroke:     var(--border);
  stroke-width: 1;
  transition: stroke var(--ease), fill var(--ease);
}
.schema-node.fact rect { stroke: rgba(6,182,212,0.22); }
.schema-node:hover rect,
.schema-node:focus-visible rect,
.schema-node.selected rect {
  stroke: var(--cyan);
  fill:   rgba(6,182,212,0.06);
}
.schema-node-title {
  fill:           var(--text-secondary);
  font-family:    var(--font-mono);
  font-size:      7.5px;
  letter-spacing: 0.1em;
  pointer-events: none;
  transition:     fill var(--ease);
}
.schema-node-sub {
  fill:           var(--text-muted);
  font-family:    var(--font-mono);
  font-size:      6px;
  letter-spacing: 0.08em;
  pointer-events: none;
}
.schema-node:hover .schema-node-title,
.schema-node:focus-visible .schema-node-title,
.schema-node.selected .schema-node-title { fill: var(--text-primary); }
.schema-line { stroke: var(--border); stroke-width: 1; fill: none; }

/* ─── SCHEMA DETAIL PANEL ────────────────────────────────────────── */
.schema-detail-panel {
  background:     var(--surface);
  border:         1px solid var(--border);
  border-radius:  var(--radius-sm);
  padding:        20px;
  min-height:     130px;
  display:        flex;
  flex-direction: column;
}
.schema-detail__placeholder {
  font-family:  var(--font-mono);
  font-size:    0.6rem;
  color:        var(--text-muted);
  letter-spacing: 0.06em;
  line-height:  1.7;
}
.schema-detail__name {
  font-family:    var(--font-mono);
  font-size:      0.6rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color:          var(--cyan);
  margin-bottom:  14px;
}
.schema-detail__field { margin-bottom: 10px; }
.schema-detail__field-label {
  font-family:    var(--font-mono);
  font-size:      0.5rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color:          var(--text-muted);
  display:        block;
  margin-bottom:  2px;
}
.schema-detail__field-value {
  font-family: var(--font-mono);
  font-size:   0.65rem;
  color:       var(--text-secondary);
  line-height: 1.45;
}

/* ─── OLIST LAYOUT ───────────────────────────────────────────────── */
.olist-article { overflow: hidden; }
.olist-top {
  display:               grid;
  grid-template-columns: 3fr 2fr;
  min-height:            400px;
}
.olist-info {
  padding:        36px 40px;
  border-right:   1px solid var(--border);
  display:        flex;
  flex-direction: column;
  gap:            20px;
}
.olist-pipeline-panel {
  padding:        28px 24px;
  display:        flex;
  flex-direction: column;
  gap:            10px;
  background:     rgba(0,0,0,0.12);
}
.project-identifier {
  display:     flex;
  align-items: center;
  gap:         10px;
  flex-wrap:   wrap;
}
.proj-num    { font-family: var(--font-mono); font-size: 0.565rem; color: var(--text-muted); letter-spacing: 0.1em; }
.proj-sep    { font-family: var(--font-mono); font-size: 0.565rem; color: var(--text-muted); }
.proj-domain { font-family: var(--font-mono); font-size: 0.565rem; letter-spacing: 0.16em; text-transform: uppercase; color: var(--text-secondary); }

.olist-h2 {
  font-size:      1.875rem;
  font-weight:    600;
  letter-spacing: -0.025em;
  line-height:    1.15;
}
.olist-desc {
  font-size:  0.875rem;
  color:      var(--text-secondary);
  line-height: 1.65;
  max-width:  52ch;
}
.olist-actions {
  display:   flex;
  gap:       10px;
  flex-wrap: wrap;
  margin-top: auto;
}

/* Olist metrics bar */
.olist-metrics-bar {
  display:               grid;
  grid-template-columns: repeat(4, 1fr);
  border-top:            1px solid var(--border);
}
.olist-metric-item {
  padding:      22px 28px;
  border-right: 1px solid var(--border);
}
.olist-metric-item:last-child { border-right: none; }
.olist-metric-value {
  font-family:    var(--font-mono);
  font-size:      1.875rem;
  font-weight:    500;
  letter-spacing: -0.03em;
  color:          var(--text-primary);
  display:        block;
  line-height:    1;
}
.olist-metric-label {
  font-family:    var(--font-mono);
  font-size:      0.55rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color:          var(--text-secondary);
  display:        block;
  margin-top:     6px;
}
.olist-metric-note {
  font-family: var(--font-mono);
  font-size:   0.5rem;
  color:       var(--text-muted);
  display:     block;
  margin-top:  3px;
  line-height: 1.4;
}

/* Schema expand inner */
.schema-inner {
  display:               grid;
  grid-template-columns: 1fr 240px;
  gap:                   16px;
  padding:               20px 24px 24px;
}

/* ─── TELEMETRY ──────────────────────────────────────────────────── */
.telemetry-card {
  background:    var(--slate);
  border:        1px solid var(--border);
  border-radius: var(--radius);
  overflow:      hidden;
}
.telemetry-header {
  padding:         14px 24px;
  border-bottom:   1px solid var(--border);
  display:         flex;
  align-items:     center;
  justify-content: space-between;
}
.telemetry-grid {
  display:               grid;
  grid-template-columns: repeat(4, 1fr);
}
.telemetry-metric {
  padding:      22px 20px;
  border-right: 1px solid var(--border);
}
.telemetry-metric:last-child { border-right: none; }
.telemetry-metric__value {
  font-family:    var(--font-mono);
  font-size:      1.625rem;
  font-weight:    500;
  letter-spacing: -0.03em;
  color:          var(--text-primary);
  display:        block;
  line-height:    1;
}
.telemetry-metric__label {
  font-family:    var(--font-mono);
  font-size:      0.52rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color:          var(--text-secondary);
  display:        block;
  margin-top:     6px;
}

/* ─── SUPPORTING PROJECT CARDS ───────────────────────────────────── */
.projects-grid {
  display:               grid;
  grid-template-columns: 1fr 1fr;
  gap:                   20px;
}
.project-card { display: flex; flex-direction: column; }
.project-card-body {
  padding:        28px;
  flex:           1;
  display:        flex;
  flex-direction: column;
  gap:            16px;
}
.project-card-h2 {
  font-size:      1.375rem;
  font-weight:    600;
  letter-spacing: -0.02em;
  line-height:    1.2;
}
.project-card-desc {
  font-size:  0.8rem;
  color:      var(--text-secondary);
  line-height: 1.6;
}
.project-card-actions { display: flex; gap: 8px; flex-wrap: wrap; margin-top: auto; }

/* Full-width spanning card (Project 06) */
.project-card--full { grid-column: 1 / -1; }

/* ─── EXPAND METRICS GRID (new academic project panels) ─────────── */
.expand-metrics-grid {
  display:               grid;
  grid-template-columns: repeat(4, 1fr);
  gap:                   1px;
  background:            var(--border);
  border-top:            1px solid var(--border);
}
.expand-metrics-grid--3col {
  grid-template-columns: repeat(3, 1fr);
}
.expand-metric-item {
  background: var(--surface);
  padding:    18px 20px;
}
.expand-metric-value {
  font-family:    var(--font-mono);
  font-size:      1.25rem;
  font-weight:    500;
  letter-spacing: -0.025em;
  color:          var(--text-primary);
  display:        block;
  line-height:    1;
}
.expand-metric-label {
  font-family:    var(--font-mono);
  font-size:      0.52rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color:          var(--text-secondary);
  display:        block;
  margin-top:     5px;
}
.expand-metric-note {
  font-family: var(--font-mono);
  font-size:   0.48rem;
  color:       var(--text-muted);
  display:     block;
  margin-top:  3px;
  line-height: 1.4;
}

/* ─── AUTOMATION PIPELINE ────────────────────────────────────────── */
.automation-svg-wrap {
  display:         flex;
  justify-content: center;
  padding:         8px 0;
}
.automation-svg { max-width: 180px; width: 100%; }

/* ─── SEQUENCE VIZ ───────────────────────────────────────────────── */
.seq-step {
  font-family:    var(--font-mono);
  font-size:      0.6rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding:        4px 9px;
  border:         1px solid var(--border);
  border-radius:  4px;
  background:     var(--surface);
  color:          var(--text-secondary);
  white-space:    nowrap;
}
.seq-step--active {
  border-color: rgba(6,182,212,0.28);
  color:        var(--text-primary);
}
.seq-step--exit {
  border-color: rgba(255,255,255,0.04);
  color:        var(--text-muted);
}
.seq-arrow { font-family: var(--font-mono); font-size: 0.7rem; color: var(--text-muted); }

/* ─── CODE BLOCK ─────────────────────────────────────────────────── */
.code-block-wrapper {
  background:    var(--surface);
  border-radius: var(--radius-sm);
  overflow:      hidden;
  margin:        0 24px 20px;
}
.code-block-header {
  display:         flex;
  align-items:     center;
  justify-content: space-between;
  padding:         9px 16px;
  border-bottom:   1px solid var(--border);
}
.code-block-label {
  font-family:    var(--font-mono);
  font-size:      0.52rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color:          var(--text-muted);
}
.code-block-lang {
  font-family:    var(--font-mono);
  font-size:      0.52rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color:          var(--cyan);
}
.code-block pre {
  padding:    16px;
  overflow-x: auto;
  margin:     0;
}
.code-block code {
  font-family: var(--font-mono);
  font-size:   0.7rem;
  line-height: 1.75;
  color:       var(--text-secondary);
}
.kw { color: #7C88D4; }
.fn { color: #85C1C9; }
.st { color: #8BAD8E; }
.cm { color: var(--text-muted); font-style: italic; }

/* ─── DOCKER ARCH ────────────────────────────────────────────────── */
.docker-arch {
  font-family: var(--font-mono);
  font-size:   0.7rem;
  color:       var(--text-secondary);
  line-height: 2.1;
  padding:     18px 24px 22px;
}
.docker-arch__root      { color: var(--text-primary); font-size: 0.65rem; letter-spacing: 0.08em; text-transform: uppercase; }
.docker-arch__connector { color: var(--text-muted); }
.docker-arch__node      { color: var(--cyan); }
.docker-arch__desc      { color: var(--text-muted); font-size: 0.625rem; }

/* ─── HOW I APPROACH DATA ────────────────────────────────────────── */
.approach-pipeline {
  position: relative;
  display:  flex;
  flex-direction: column;
}
.approach-pipeline::before {
  content:    '';
  position:   absolute;
  left:       16px;
  top:        6px;
  bottom:     6px;
  width:      1px;
  background: var(--border);
}
.approach-stage {
  display:     flex;
  align-items: flex-start;
  gap:         18px;
  padding:     11px 0;
  position:    relative;
}
.approach-stage__dot {
  width:         8px;
  height:        8px;
  border-radius: 50%;
  background:    var(--surface-alt);
  border:        1px solid var(--border-hover);
  margin-left:   12px;
  flex-shrink:   0;
  margin-top:    3px;
  z-index:       1;
  transition:    background var(--ease), border-color var(--ease);
}
.approach-stage.active .approach-stage__dot {
  background:   var(--cyan);
  border-color: var(--cyan);
}
.approach-stage__num  { font-family: var(--font-mono); font-size: 0.55rem; letter-spacing: 0.12em; color: var(--text-muted); }
.approach-stage__name { font-family: var(--font-mono); font-size: 0.65rem; letter-spacing: 0.15em; text-transform: uppercase; color: var(--text-primary); margin-bottom: 2px; }
.approach-stage__desc { font-size: 0.775rem; color: var(--text-secondary); line-height: 1.5; }

/* ─── HOW I WORK ─────────────────────────────────────────────────── */
.work-steps {
  display:               grid;
  grid-template-columns: repeat(5, 1fr);
  gap:                   1px;
  background:            var(--border);
  border:                1px solid var(--border);
  border-radius:         var(--radius);
  overflow:              hidden;
}
.work-step {
  background:  var(--slate);
  padding:     22px 20px;
  transition:  background var(--ease);
}
.work-step:hover { background: var(--surface); }
.work-step__num  { font-family: var(--font-mono); font-size: 1.125rem; color: var(--text-muted); display: block; margin-bottom: 10px; letter-spacing: -0.02em; }
.work-step__name { font-family: var(--font-mono); font-size: 0.6rem; letter-spacing: 0.18em; text-transform: uppercase; color: var(--text-primary); display: block; margin-bottom: 7px; }
.work-step__desc { font-size: 0.775rem; color: var(--text-secondary); line-height: 1.55; }

/* ─── TECH ARSENAL ───────────────────────────────────────────────── */
.arsenal-grid {
  display:               grid;
  grid-template-columns: repeat(3, 1fr);
  gap:                   16px;
}
.arsenal-card {
  background:    var(--slate);
  border:        1px solid var(--border);
  border-radius: var(--radius);
  overflow:      hidden;
}
.arsenal-col-header {
  padding:        14px 20px;
  border-bottom:  1px solid var(--border);
  font-family:    var(--font-mono);
  font-size:      0.55rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color:          var(--text-secondary);
}
.arsenal-tags { padding: 16px 20px; display: flex; flex-wrap: wrap; gap: 6px; }

/* Arsenal tooltip */
.arsenal-tag-wrap    { position: relative; display: inline-block; }
.arsenal-tooltip {
  position:       absolute;
  bottom:         calc(100% + 8px);
  left:           50%;
  transform:      translateX(-50%);
  width:          165px;
  background:     var(--slate);
  border:         1px solid var(--border-hover);
  border-radius:  var(--radius-sm);
  padding:        10px 12px;
  z-index:        50;
  pointer-events: none;
  opacity:        0;
  transition:     opacity 180ms ease;
}
.arsenal-tag-wrap:hover .arsenal-tooltip { opacity: 1; }
.arsenal-tooltip__name {
  font-family:    var(--font-mono);
  font-size:      0.575rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color:          var(--text-primary);
  display:        block;
  margin-bottom:  6px;
}
.arsenal-tooltip__use {
  font-family:  var(--font-mono);
  font-size:    0.56rem;
  color:        var(--text-secondary);
  line-height:  1.65;
  display:      block;
}
.arsenal-tooltip__use::before { content: '→ '; color: var(--cyan); }

/* ─── ABOUT ──────────────────────────────────────────────────────── */
.about-text {
  font-size:  1rem;
  color:      var(--text-secondary);
  line-height: 1.75;
  max-width:  56ch;
}
.about-tag {
  font-family:    var(--font-mono);
  font-size:      0.625rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color:          var(--text-secondary);
  display:        flex;
  align-items:    center;
  gap:            10px;
}
.about-tag::before {
  content:    '';
  width:      16px;
  height:     1px;
  background: var(--border-hover);
  flex-shrink: 0;
}

/* ─── CONTACT ────────────────────────────────────────────────────── */
.contact-heading {
  font-size:      clamp(1.75rem, 3.5vw, 2.5rem);
  font-weight:    600;
  letter-spacing: -0.03em;
  line-height:    1.1;
  color:          var(--text-primary);
  margin-bottom:  36px;
}
.contact-links { display: flex; gap: 12px; flex-wrap: wrap; }

/* ─── FOOTER ─────────────────────────────────────────────────────── */
footer { border-top: 1px solid var(--border); padding-block: 32px; }
.footer-inner {
  display:         flex;
  align-items:     flex-start;
  justify-content: space-between;
  flex-wrap:       wrap;
  gap:             24px;
}
.footer-brand   { font-family: var(--font-mono); font-size: 0.625rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--text-primary); display: block; margin-bottom: 4px; }
.footer-tagline { font-family: var(--font-mono); font-size: 0.55rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--text-secondary); }
.footer-meta    { font-family: var(--font-mono); font-size: 0.55rem; color: var(--text-muted); text-align: right; letter-spacing: 0.08em; }
.footer-status  { display: flex; align-items: center; gap: 6px; font-family: var(--font-mono); font-size: 0.52rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--text-muted); margin-top: 8px; }
.footer-status__dot { width: 4px; height: 4px; border-radius: 50%; background: var(--emerald); }

/* ─── SCROLL REVEAL ──────────────────────────────────────────────── */
[data-reveal] {
  opacity:    0;
  transform:  translateY(14px);
  transition: opacity 500ms ease, transform 500ms ease;
}
[data-reveal].visible { opacity: 1; transform: none; }

/* ─── FOCUS STATES ───────────────────────────────────────────────── */
:focus-visible { outline: 2px solid var(--cyan); outline-offset: 2px; border-radius: 2px; }

/* ─── SELECTION ──────────────────────────────────────────────────── */
::selection { background: rgba(6,182,212,0.18); color: var(--text-primary); }

/* ─── SCROLLBAR ──────────────────────────────────────────────────── */
::-webkit-scrollbar       { width: 5px; }
::-webkit-scrollbar-track { background: var(--void); }
::-webkit-scrollbar-thumb { background: var(--border-hover); border-radius: 3px; }

/* ─── RESPONSIVE ─────────────────────────────────────────────────── */
@media (max-width: 1200px) {
  .telemetry-grid { grid-template-columns: repeat(2, 1fr); }
  .telemetry-metric { border-right: 1px solid var(--border); border-bottom: 1px solid var(--border); }
  .telemetry-metric:nth-child(2n) { border-right: none; }
  .telemetry-metric:nth-last-child(-n+2) { border-bottom: none; }
}

@media (max-width: 1024px) {
  .container, .nav-inner { padding-inline: 32px; }
  .olist-top { grid-template-columns: 1fr; }
  .olist-info { border-right: none; border-bottom: 1px solid var(--border); }
  .olist-pipeline-panel { padding: 24px 32px; }
  .schema-inner { grid-template-columns: 1fr; }
  .work-steps { grid-template-columns: repeat(2, 1fr); }
  .olist-metrics-bar { grid-template-columns: repeat(2, 1fr); }
  .olist-metric-item:nth-child(2) { border-right: none; }
  .olist-metric-item:nth-child(3) { border-top: 1px solid var(--border); }
  .arsenal-grid { grid-template-columns: 1fr; gap: 12px; }
  /* expand-trigger hint always visible at tablet+ */
  .expand-trigger__hint { display: block; }
}

@media (max-width: 768px) {
  .container, .nav-inner, #nav-mobile { padding-inline: 20px; }
  .nav-links, .nav-status { display: none; }
  .nav-hamburger { display: flex; }
  .section { padding-block: 56px; }
  .olist-info { padding: 22px; }
  .olist-h2 { font-size: 1.5rem; }
  .olist-actions { flex-wrap: wrap; }
  .olist-metrics-bar { grid-template-columns: 1fr 1fr; }
  .projects-grid { grid-template-columns: 1fr; }
  .work-steps { grid-template-columns: 1fr; }
  /* Reset telemetry metrics to 2-col on mobile */
  .telemetry-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-inner { flex-direction: column; }
  .footer-meta { text-align: left; }
  /* pipeline vertical on mobile */
  .approach-pipeline { display: flex; }
  .about-grid { grid-template-columns: 1fr !important; }
  .contact-columns { grid-template-columns: 1fr !important; }
  /* schema detail stacks below SVG on mobile */
  .schema-inner { grid-template-columns: 1fr; padding: 14px 16px 18px; }
}

@media (max-width: 480px) {
  .olist-h2 { font-size: 1.25rem; }
  .telemetry-grid { grid-template-columns: repeat(2, 1fr); }
  .olist-metric-value { font-size: 1.5rem; }
}

/* ─── REDUCED MOTION ─────────────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration:       0.01ms !important;
    animation-iteration-count: 1    !important;
    transition-duration:       0.01ms !important;
  }
  html { scroll-behavior: auto; }
  [data-reveal] { opacity: 1; transform: none; }
}