/* ═══════════════════════════════════════════════════════════
   INSIDE YOUR COMPUTER — Interactive Explainer
   Aesthetic: Warm Technical Manual / Blueprint + Cream
   Fonts: Fraunces (display) + Plus Jakarta Sans (body) + JetBrains Mono
   ═══════════════════════════════════════════════════════════ */

@import url('https://fonts.googleapis.com/css2?family=Fraunces:ital,opsz,wght@0,9..144,300;0,9..144,600;0,9..144,700;0,9..144,900;1,9..144,400&family=Plus+Jakarta+Sans:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500;700&display=swap');

:root {
  --cream:   #f5f0e8;
  --cream2:  #ede6d6;
  --cream3:  #e2d8c4;
  --paper:   #faf7f2;
  --ink:     #1c1a17;
  --ink2:    #3a3630;
  --ink3:    #6b6358;
  --ink4:    #9c9589;
  --rust:    #c0410f;
  --rust2:   #e85d2a;
  --teal:    #0f7c7a;
  --teal2:   #14a8a5;
  --gold:    #b07d12;
  --gold2:   #d4a017;
  --blue:    #1a4a8a;
  --blue2:   #2d6fd4;
  --purple:  #5c2d8a;
  --green:   #1a6b3c;
  --green2:  #22a05a;

  --font-display: 'Fraunces', serif;
  --font-body:    'Plus Jakarta Sans', sans-serif;
  --font-mono:    'JetBrains Mono', monospace;
  --radius:  12px;
  --radius-sm: 7px;
  --shadow:  0 2px 12px rgba(28,26,23,0.10);
  --shadow-lg: 0 8px 32px rgba(28,26,23,0.15);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.7;
  min-height: 100vh;
  overflow-x: hidden;
  position: relative;
}

/* Blueprint grid background */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(28,26,23,0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(28,26,23,0.035) 1px, transparent 1px);
  background-size: 32px 32px;
  pointer-events: none;
  z-index: 0;
}

/* Warm vignette */
body::after {
  content: '';
  position: fixed;
  inset: 0;
  background: radial-gradient(ellipse at center, transparent 60%, rgba(180,160,120,0.12) 100%);
  pointer-events: none;
  z-index: 0;
}

/* ── LAYOUT ── */
.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 28px;
  position: relative;
  z-index: 1;
}

/* ── HERO ── */
.hero {
  padding: 64px 0 48px;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 24px;
  align-items: end;
  border-bottom: 2px solid var(--ink);
  margin-bottom: 0;
}
@media(max-width:600px){ .hero { grid-template-columns: 1fr; } }

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--rust);
  border: 1px solid var(--rust);
  padding: 4px 10px;
  border-radius: 3px;
  margin-bottom: 16px;
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(38px, 6vw, 72px);
  font-weight: 900;
  line-height: 0.95;
  letter-spacing: -0.03em;
  color: var(--ink);
  margin-bottom: 16px;
}
.hero-title em {
  font-style: italic;
  font-weight: 400;
  color: var(--rust);
}

.hero-sub {
  font-size: 15px;
  color: var(--ink3);
  max-width: 480px;
  line-height: 1.75;
  font-weight: 300;
}

.hero-meta {
  text-align: right;
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--ink4);
  line-height: 1.8;
  letter-spacing: 0.04em;
  padding-bottom: 4px;
}

/* ── NAV ── */
.nav-wrap {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(245,240,232,0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--cream3);
}

.nav-inner {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 28px;
  display: flex;
  gap: 0;
  overflow-x: auto;
  scrollbar-width: none;
}
.nav-inner::-webkit-scrollbar { display: none; }

.nav-btn {
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 600;
  padding: 14px 18px;
  background: none;
  border: none;
  color: var(--ink4);
  cursor: pointer;
  position: relative;
  white-space: nowrap;
  transition: color 0.18s;
  letter-spacing: 0.01em;
  display: flex;
  align-items: center;
  gap: 6px;
}
.nav-btn .nav-dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: currentColor;
  opacity: 0;
  transition: opacity 0.18s;
  flex-shrink: 0;
}
.nav-btn:hover { color: var(--ink2); }
.nav-btn.active { color: var(--rust); }
.nav-btn.active .nav-dot { opacity: 1; background: var(--rust); }
.nav-btn.active::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 2px;
  background: var(--rust);
}

/* ── PAGES ── */
.page { display: none; padding: 48px 0 64px; }
.page.active { display: block; animation: fadeIn 0.3s ease; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: translateY(0); } }

/* ── SECTION HEADING ── */
.sec-label {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--rust);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.sec-label::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--cream3);
}

.sec-title {
  font-family: var(--font-display);
  font-size: clamp(26px, 4vw, 38px);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin-bottom: 10px;
}

.sec-desc {
  font-size: 15px;
  color: var(--ink3);
  max-width: 640px;
  line-height: 1.75;
  font-weight: 300;
  margin-bottom: 32px;
}

/* ── CARDS ── */
.card {
  background: white;
  border: 1px solid var(--cream3);
  border-radius: var(--radius);
  padding: 22px 26px;
  margin-bottom: 18px;
  box-shadow: var(--shadow);
  position: relative;
  overflow: hidden;
}
.card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: transparent;
}
.card-rust::before { background: var(--rust); }
.card-teal::before { background: var(--teal); }
.card-gold::before { background: var(--gold); }
.card-blue::before { background: var(--blue); }
.card-purple::before { background: var(--purple); }
.card-green::before { background: var(--green); }

.card-lbl {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink4);
  margin-bottom: 14px;
}

/* ── COMPONENT CARDS (big interactive) ── */
.comp-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}

.comp-card {
  background: white;
  border: 1px solid var(--cream3);
  border-radius: var(--radius);
  padding: 20px 22px;
  cursor: pointer;
  transition: all 0.2s;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow);
}
.comp-card::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, transparent 60%, rgba(28,26,23,0.02));
}
.comp-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
  border-color: var(--ink3);
}
.comp-card.selected {
  border-color: var(--rust);
  box-shadow: 0 0 0 2px rgba(192,65,15,0.15), var(--shadow);
}
.comp-card.selected::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--rust);
}

.comp-icon {
  font-size: 32px;
  margin-bottom: 10px;
  display: block;
  line-height: 1;
}
.comp-name {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 4px;
  letter-spacing: -0.01em;
}
.comp-short {
  font-size: 12px;
  color: var(--ink3);
  line-height: 1.5;
}
.comp-tag {
  display: inline-block;
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 3px 8px;
  border-radius: 3px;
  font-weight: 500;
}

/* tag colours */
.tag-process { background: rgba(192,65,15,0.1); color: var(--rust); }
.tag-memory  { background: rgba(15,124,122,0.1); color: var(--teal); }
.tag-storage { background: rgba(176,125,18,0.1); color: var(--gold); }
.tag-io      { background: rgba(26,74,138,0.1);  color: var(--blue); }
.tag-power   { background: rgba(92,45,138,0.1);  color: var(--purple); }
.tag-connect { background: rgba(26,107,60,0.1);  color: var(--green); }
.tag-display { background: rgba(92,45,138,0.1);  color: var(--purple); }
.tag-cool    { background: rgba(26,74,138,0.1);  color: var(--blue); }
.tag-board   { background: rgba(28,26,23,0.08);  color: var(--ink2); }

/* ── DETAIL PANEL ── */
.detail-panel {
  background: var(--cream);
  border: 1px solid var(--cream3);
  border-left: 4px solid var(--rust);
  border-radius: var(--radius);
  padding: 28px 30px;
  margin-bottom: 24px;
  animation: slideDown 0.25s ease;
  box-shadow: var(--shadow);
}
@keyframes slideDown { from { opacity: 0; transform: translateY(-10px); } to { opacity: 1; transform: translateY(0); } }

.detail-header {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 20px;
}
.detail-icon { font-size: 40px; line-height: 1; flex-shrink: 0; }
.detail-title {
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 700;
  letter-spacing: -0.02em;
}
.detail-subtitle { font-size: 13px; color: var(--ink3); margin-top: 3px; }

.detail-body { font-size: 14px; color: var(--ink2); line-height: 1.8; margin-bottom: 18px; }

.detail-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-top: 16px;
}
@media(max-width:560px){ .detail-grid { grid-template-columns: 1fr; } }

.detail-tile {
  background: white;
  border: 1px solid var(--cream3);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
}
.dt-label { font-family: var(--font-mono); font-size: 9px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink4); margin-bottom: 5px; }
.dt-val { font-size: 14px; font-weight: 600; color: var(--ink); margin-bottom: 3px; }
.dt-desc { font-size: 12px; color: var(--ink3); line-height: 1.5; }

/* type list inside detail */
.type-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 12px;
}
.type-item {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  background: white;
  border: 1px solid var(--cream3);
  border-radius: var(--radius-sm);
  padding: 11px 14px;
}
.type-marker {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--rust);
  margin-top: 7px;
  flex-shrink: 0;
}
.type-name { font-weight: 600; font-size: 13px; color: var(--ink); }
.type-desc { font-size: 12px; color: var(--ink3); margin-top: 2px; line-height: 1.5; }

/* ── MOTHERBOARD PAGE ── */
.mb-diagram {
  background: #0f1c2e;
  border-radius: var(--radius);
  padding: 0;
  position: relative;
  overflow: hidden;
  aspect-ratio: 4/3;
  max-height: 520px;
  border: 2px solid #1a2d47;
  box-shadow: var(--shadow-lg);
  cursor: default;
  user-select: none;
}

.mb-bg {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(rgba(20,168,165,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(20,168,165,0.04) 1px, transparent 1px);
  background-size: 18px 18px;
}

.mb-component {
  position: absolute;
  border-radius: 5px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 9px;
  text-align: center;
  cursor: pointer;
  transition: all 0.18s;
  line-height: 1.3;
  padding: 4px;
}
.mb-component:hover { filter: brightness(1.2); transform: scale(1.04); z-index: 10; }
.mb-component.mb-active { filter: brightness(1.3); z-index: 20; box-shadow: 0 0 16px 4px currentColor; }

/* individual MB components */
.mb-cpu    { background:#1e3a1e; color:#6ee76e; border:1px solid #3a6e3a; }
.mb-ram    { background:#1a1e3a; color:#818cf8; border:1px solid #3a3e6e; }
.mb-pcie   { background:#1e1a3a; color:#c084fc; border:1px solid #3e306e; }
.mb-chipset{ background:#1a2e2e; color:#67e8f9; border:1px solid #2a4e4e; }
.mb-bios   { background:#2e2a1a; color:#fbbf24; border:1px solid #5e5030; }
.mb-sata   { background:#2e1a1a; color:#f87171; border:1px solid #6e3030; }
.mb-usb    { background:#1a2e1a; color:#86efac; border:1px solid #306e30; }
.mb-power  { background:#2e2010; color:#fb923c; border:1px solid #6e4818; }
.mb-audio  { background:#2a1a2e; color:#f0abfc; border:1px solid #502e5e; }
.mb-eth    { background:#102e2a; color:#5eead4; border:1px solid #1e5e56; }
.mb-m2     { background:#2e1e10; color:#fdba74; border:1px solid #6e4020; }
.mb-vrm    { background:#2e1e1e; color:#fca5a5; border:1px solid #6e3e3e; }
.mb-trace  { position:absolute; background:transparent; border:none; pointer-events:none; }

/* PCB edge label */
.mb-edge {
  position: absolute;
  font-family: var(--font-mono);
  font-size: 8px;
  color: rgba(110,231,183,0.3);
  letter-spacing: 0.06em;
  pointer-events: none;
}

.mb-info-panel {
  background: #0a1520;
  border: 1px solid #1a3050;
  border-radius: var(--radius);
  padding: 20px 24px;
  margin-top: 14px;
  min-height: 80px;
  transition: all 0.2s;
}
.mb-info-name {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  color: #e2d8c4;
  margin-bottom: 4px;
}
.mb-info-text { font-size: 13px; color: #7a8a9a; line-height: 1.7; }
.mb-info-tag {
  display: inline-block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 2px 8px;
  border-radius: 3px;
}

/* MB component list below diagram */
.mb-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 10px;
  margin: 18px 0;
}
.mb-list-item {
  background: white;
  border: 1px solid var(--cream3);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  cursor: pointer;
  transition: all 0.15s;
  display: flex;
  align-items: center;
  gap: 10px;
}
.mb-list-item:hover { border-color: var(--rust); }
.mb-list-item.mb-active-item { border-color: var(--rust); background: var(--cream); }
.mb-dot { width: 8px; height: 8px; border-radius: 2px; flex-shrink: 0; }
.mb-list-name { font-size: 13px; font-weight: 600; color: var(--ink); }
.mb-list-sub { font-size: 11px; color: var(--ink4); }

/* ── INTERACTION FLOW ── */
.flow-container {
  position: relative;
  padding: 8px 0;
}

.flow-row {
  display: flex;
  align-items: center;
  gap: 0;
  margin-bottom: 6px;
  flex-wrap: wrap;
}

.flow-node {
  background: white;
  border: 1px solid var(--cream3);
  border-radius: var(--radius-sm);
  padding: 10px 16px;
  font-size: 13px;
  font-weight: 600;
  color: var(--ink);
  box-shadow: var(--shadow);
  white-space: nowrap;
  position: relative;
  transition: all 0.2s;
  cursor: default;
}
.flow-node.highlight {
  border-color: var(--rust);
  background: var(--cream);
  box-shadow: 0 0 0 2px rgba(192,65,15,0.12), var(--shadow);
}
.flow-node .fn-label {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink4);
  display: block;
  margin-bottom: 3px;
}
.flow-node .fn-name { font-size: 13px; font-weight: 700; color: var(--ink); }
.flow-node .fn-desc { font-size: 11px; color: var(--ink3); margin-top: 2px; font-weight: 400; }

.flow-arrow {
  font-size: 18px;
  color: var(--ink4);
  padding: 0 8px;
  flex-shrink: 0;
}
.flow-arrow.down {
  display: flex;
  justify-content: flex-start;
  padding: 4px 0 4px 24px;
  font-size: 16px;
  color: var(--rust);
}

/* scenario tabs */
.scenario-tabs {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-bottom: 20px;
}
.s-tab {
  padding: 8px 16px;
  border: 1px solid var(--cream3);
  border-radius: 20px;
  background: white;
  font-size: 13px;
  font-weight: 500;
  color: var(--ink3);
  cursor: pointer;
  transition: all 0.15s;
}
.s-tab:hover { border-color: var(--ink3); color: var(--ink); }
.s-tab.active { background: var(--rust); border-color: var(--rust); color: white; }

.scenario-panel {
  background: var(--cream);
  border: 1px solid var(--cream3);
  border-radius: var(--radius);
  padding: 24px 28px;
  animation: fadeIn 0.2s ease;
}
.sp-title {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 6px;
  letter-spacing: -0.01em;
}
.sp-desc { font-size: 14px; color: var(--ink3); margin-bottom: 20px; line-height: 1.7; }

.step-list { display: flex; flex-direction: column; gap: 10px; }
.step-item {
  display: flex;
  gap: 14px;
  align-items: flex-start;
}
.step-num {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--rust);
  color: white;
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-top: 1px;
}
.step-content { flex: 1; }
.step-title { font-size: 14px; font-weight: 700; color: var(--ink); margin-bottom: 2px; }
.step-desc { font-size: 12px; color: var(--ink3); line-height: 1.6; }
.step-part {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 10px;
  padding: 1px 7px;
  border-radius: 3px;
  background: rgba(192,65,15,0.1);
  color: var(--rust);
  margin-left: 4px;
}

/* ── COMPARE TABLE ── */
.cmp-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}
.cmp-table th {
  text-align: left;
  padding: 10px 14px;
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink4);
  font-weight: 500;
  border-bottom: 2px solid var(--cream3);
  background: var(--cream);
}
.cmp-table td {
  padding: 11px 14px;
  border-bottom: 1px solid var(--cream3);
  vertical-align: top;
  line-height: 1.55;
  color: var(--ink2);
}
.cmp-table tr:last-child td { border-bottom: none; }
.cmp-table tr:hover td { background: var(--cream); }
.cmp-table .cn { font-weight: 700; color: var(--ink); font-size: 13px; }

.badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 3px;
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.02em;
}
.b-rust   { background: rgba(192,65,15,0.1);  color: var(--rust); }
.b-teal   { background: rgba(15,124,122,0.1); color: var(--teal); }
.b-gold   { background: rgba(176,125,18,0.1); color: var(--gold); }
.b-blue   { background: rgba(26,74,138,0.1);  color: var(--blue); }
.b-purple { background: rgba(92,45,138,0.1);  color: var(--purple); }
.b-green  { background: rgba(26,107,60,0.1);  color: var(--green); }
.b-ink    { background: rgba(28,26,23,0.08);  color: var(--ink2); }

/* ── CALLOUT ── */
.callout {
  border-radius: var(--radius-sm);
  padding: 14px 18px;
  margin: 16px 0;
  font-size: 13px;
  line-height: 1.75;
  border-left: 4px solid;
}
.c-rust   { background: rgba(192,65,15,0.06);  border-color: var(--rust);   color: var(--ink2); }
.c-rust   strong { color: var(--rust); }
.c-teal   { background: rgba(15,124,122,0.06); border-color: var(--teal);   color: var(--ink2); }
.c-teal   strong { color: var(--teal); }
.c-gold   { background: rgba(176,125,18,0.08); border-color: var(--gold);   color: var(--ink2); }
.c-gold   strong { color: var(--gold); }
.c-blue   { background: rgba(26,74,138,0.06);  border-color: var(--blue);   color: var(--ink2); }
.c-blue   strong { color: var(--blue); }
.c-green  { background: rgba(26,107,60,0.06);  border-color: var(--green);  color: var(--ink2); }
.c-green  strong { color: var(--green); }

/* ── GRIDS ── */
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.grid3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 12px; }
@media(max-width:600px){ .grid2{grid-template-columns:1fr;} .grid3{grid-template-columns:1fr 1fr;} }
@media(max-width:420px){ .grid3{grid-template-columns:1fr;} }

.tile {
  background: white;
  border: 1px solid var(--cream3);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  box-shadow: 0 1px 4px rgba(28,26,23,0.06);
}
.tile-lbl { font-family: var(--font-mono); font-size: 9px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink4); margin-bottom: 6px; }
.tile-val { font-family: var(--font-display); font-size: 22px; font-weight: 700; color: var(--ink); margin-bottom: 3px; }
.tile-sub { font-size: 11px; color: var(--ink4); line-height: 1.5; }

/* ── PAGE NAV ── */
.page-nav {
  display: flex;
  gap: 10px;
  margin-top: 40px;
  padding-top: 28px;
  border-top: 1px solid var(--cream3);
  flex-wrap: wrap;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 22px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--cream3);
  background: white;
  color: var(--ink2);
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s;
  box-shadow: 0 1px 4px rgba(28,26,23,0.06);
}
.btn:hover { border-color: var(--ink3); background: var(--cream); }
.btn-primary {
  background: var(--rust);
  border-color: var(--rust);
  color: white;
}
.btn-primary:hover { background: var(--rust2); border-color: var(--rust2); box-shadow: 0 4px 14px rgba(192,65,15,0.25); }

/* ── SPEED / FUN FACTS ── */
.fact-row {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin: 14px 0;
}
.fact-chip {
  background: white;
  border: 1px solid var(--cream3);
  border-radius: var(--radius-sm);
  padding: 10px 16px;
  flex: 1;
  min-width: 140px;
  box-shadow: 0 1px 4px rgba(28,26,23,0.05);
}
.fc-val { font-family: var(--font-display); font-size: 20px; font-weight: 700; margin-bottom: 2px; }
.fc-desc { font-size: 11px; color: var(--ink4); line-height: 1.4; }

/* ── DATA BUS ANIMATION ── */
.bus-demo {
  background: #0f1c2e;
  border-radius: var(--radius);
  padding: 24px;
  margin: 16px 0;
  overflow: hidden;
  position: relative;
  min-height: 120px;
}
.bus-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}
.bus-label {
  font-family: var(--font-mono);
  font-size: 10px;
  color: rgba(255,255,255,0.4);
  letter-spacing: 0.06em;
  width: 72px;
  flex-shrink: 0;
}
.bus-track {
  flex: 1;
  height: 8px;
  background: rgba(255,255,255,0.06);
  border-radius: 4px;
  overflow: hidden;
  position: relative;
}
.bus-packet {
  position: absolute;
  top: 0;
  height: 100%;
  border-radius: 4px;
  width: 40px;
  animation: busMove 2s linear infinite;
  opacity: 0.85;
}
.bus-packet:nth-child(2) { animation-delay: 0.7s; }
.bus-packet:nth-child(3) { animation-delay: 1.4s; }
@keyframes busMove { from { left: -40px; } to { left: 100%; } }
.bus-end {
  width: 36px;
  height: 28px;
  border-radius: 5px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  flex-shrink: 0;
}
.bus-start {
  width: 36px;
  height: 28px;
  border-radius: 5px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  flex-shrink: 0;
}

/* ── RESPONSIVE ── */
@media(max-width:600px) {
  .container { padding: 0 16px; }
  .hero { padding: 40px 0 32px; }
  .comp-grid { grid-template-columns: 1fr 1fr; }
  .detail-grid { grid-template-columns: 1fr; }
  .mb-list { grid-template-columns: 1fr 1fr; }
}
@media(max-width:420px) {
  .comp-grid { grid-template-columns: 1fr; }
}