/* ==========================================================
   Olobay DIY · 创意工坊样式
   Blueprint × Maker Workshop
   ========================================================== */

:root{
  --clr-bg:           #0E0818;
  --clr-bg-2:         #120C1E;
  --clr-surface:      #1A1428;
  --clr-surface-2:    #221A33;
  --clr-border:       rgba(255,255,255,0.08);
  --clr-border-2:     rgba(255,255,255,0.14);

  --clr-primary:      #FF6B35;
  --clr-primary-dim:  rgba(255,107,53,0.14);
  --clr-gold:         #FFD166;
  --clr-purple:       #B8A9C9;
  --clr-rose:         #FF4D7E;

  --clr-text:         #ECECF4;
  --clr-text-2:       #8A8AA0;
  --clr-text-3:       #555569;

  --clr-blueprint:        #0E1B36;
  --clr-blueprint-deep:   #091228;
  --clr-blueprint-line:   rgba(99,179,237,0.16);
  --clr-blueprint-line-2: rgba(99,179,237,0.28);
  --clr-blueprint-ink:    #63B3ED;
  --clr-blueprint-ink-2:  rgba(99,179,237,0.55);

  --clr-pcb:          #1A3A2A;
  --clr-pcb-trace:    rgba(220,180,90,0.5);

  --clr-green:        #39D98A;
  --clr-amber:        #FFB300;
  --clr-red:          #FF4757;

  --sig-i2s:   #FF8A3D;
  --sig-spi:   #5BA3FF;
  --sig-i2c:   #5BE0A8;
  --sig-pwr:   #FF4757;
  --sig-gnd:   #6E7585;
  --sig-gpio:  #C58CFF;

  --r-card:    14px;
  --r-tag:     6px;

  --font-head: 'Plus Jakarta Sans', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-mono: 'JetBrains Mono', 'IBM Plex Mono', ui-monospace, monospace;
  --font-body: 'Plus Jakarta Sans', 'PingFang SC', 'Microsoft YaHei', sans-serif;

  --blueprint-grid:
    repeating-linear-gradient(0deg,
      var(--clr-blueprint-line) 0, var(--clr-blueprint-line) 1px,
      transparent 1px, transparent 40px),
    repeating-linear-gradient(90deg,
      var(--clr-blueprint-line) 0, var(--clr-blueprint-line) 1px,
      transparent 1px, transparent 40px);

  --blueprint-grid-fine:
    repeating-linear-gradient(0deg,
      rgba(99,179,237,0.07) 0, rgba(99,179,237,0.07) 1px,
      transparent 1px, transparent 8px),
    repeating-linear-gradient(90deg,
      rgba(99,179,237,0.07) 0, rgba(99,179,237,0.07) 1px,
      transparent 1px, transparent 8px);
}

*{ box-sizing:border-box; }
html, body{ margin:0; padding:0; }
body{
  font-family: var(--font-body);
  background: var(--clr-bg);
  color: var(--clr-text);
  font-size: 15px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x:hidden;
}
img,svg{ display:block; max-width:100%; }
button{ font-family: inherit; cursor:pointer; }
a{ color:inherit; text-decoration:none; }

/* ---------- Reusable atoms ---------- */
.mono{ font-family: var(--font-mono); }
.eyebrow{
  display:inline-flex; align-items:center; gap:8px;
  padding:6px 14px; border-radius:999px;
  border:1px solid rgba(99,179,237,0.35);
  background: rgba(99,179,237,0.07);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--clr-blueprint-ink);
  text-transform: uppercase;
  font-weight:700;
}
.eyebrow .dot{
  width:6px; height:6px; border-radius:50%;
  background: var(--clr-blueprint-ink);
  box-shadow: 0 0 8px var(--clr-blueprint-ink);
}

.btn{
  display:inline-flex; align-items:center; gap:10px;
  padding: 12px 22px; border-radius: 10px;
  font-family: var(--font-head); font-weight:700; font-size:14px;
  border: 1px solid transparent;
  transition: all .2s ease;
  letter-spacing:.01em;
}
.btn-primary{
  background: var(--clr-primary);
  color: #1A0F08;
  border-color: var(--clr-primary);
  box-shadow: 0 6px 20px rgba(255,107,53,0.28);
}
.btn-primary:hover{ transform: translateY(-1px); box-shadow: 0 10px 28px rgba(255,107,53,0.36); }
.btn-ghost{
  background: transparent;
  color: var(--clr-text);
  border-color: var(--clr-border-2);
}
.btn-ghost:hover{ border-color: var(--clr-primary); color: var(--clr-primary); }
.btn-block{ width:100%; justify-content:center; }
.btn-sm{ padding:8px 14px; font-size:12px; }

/* ---------- Layout ---------- */
.wrap{ max-width: 1360px; margin: 0 auto; padding: 0 36px; }
section{ position:relative; }

/* =====================================================
   TOP STRIP — workshop window frame
   ===================================================== */
.topstrip{
  position: sticky; top:0; z-index:60;
  background: rgba(14,8,24,0.78);
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  border-bottom: 1px solid var(--clr-border);
}
.topstrip-inner{
  display:flex; align-items:center; gap: 28px;
  padding: 14px 36px;
  max-width: 1360px; margin:0 auto;
}
.brand{
  display:flex; align-items:center; gap:12px;
  font-family: var(--font-head); font-weight:800;
  font-size: 15px; letter-spacing:.01em;
}
.brand-mark{
  width:30px; height:30px; border-radius:8px;
  background:
    radial-gradient(circle at 30% 30%, var(--clr-gold), transparent 50%),
    linear-gradient(135deg, var(--clr-primary), #D54417);
  position:relative;
  box-shadow: inset 0 0 0 1px rgba(255,255,255,0.18), 0 4px 14px rgba(255,107,53,0.35);
}
.brand-mark::after{
  content:''; position:absolute; inset:6px;
  background:
    linear-gradient(transparent 49%, rgba(0,0,0,0.35) 49%, rgba(0,0,0,0.35) 51%, transparent 51%),
    linear-gradient(90deg, transparent 49%, rgba(0,0,0,0.35) 49%, rgba(0,0,0,0.35) 51%, transparent 51%);
}
.brand-title{ display:flex; flex-direction:column; line-height:1.1; }
.brand-title small{ font-family: var(--font-mono); font-size:10px; color: var(--clr-text-2); letter-spacing:.12em; font-weight:600; }

.nav{ display:flex; gap:6px; margin-left: 18px; }
.nav a{
  padding: 8px 14px; font-size: 13px; color: var(--clr-text-2);
  font-weight:600; border-radius:8px;
  display:flex; align-items:center; gap:6px;
}
.nav a:hover{ color: var(--clr-text); background: rgba(255,255,255,0.04); }
.nav a.active{ color: var(--clr-text); background: rgba(255,107,53,0.10); }
.nav-badge{
  font-family: var(--font-mono); font-size: 9px;
  padding: 1px 5px; border-radius: 4px;
  background: var(--clr-primary); color: #1A0F08;
  font-weight: 800; letter-spacing: 0.05em;
}

.nav-cta{ margin-left:auto; display:flex; gap:10px; align-items:center; }
.tt-status{
  display:flex; align-items:center; gap:8px;
  font-family: var(--font-mono); font-size:11px; color: var(--clr-text-2);
}
.tt-status .pulse{ width:8px; height:8px; border-radius:50%; background: var(--clr-green); box-shadow:0 0 0 0 rgba(57,217,138,.55); animation: pulse 1.8s infinite; }
@keyframes pulse{ 0%{ box-shadow:0 0 0 0 rgba(57,217,138,.55);} 70%{ box-shadow:0 0 0 8px rgba(57,217,138,0);} 100%{ box-shadow:0 0 0 0 rgba(57,217,138,0);} }

.breadcrumb{
  display:flex; align-items:center; gap:8px;
  padding: 10px 36px;
  font-family: var(--font-mono); font-size: 11px;
  color: var(--clr-text-3); letter-spacing:.05em;
  border-bottom: 1px solid var(--clr-border);
  background: rgba(14,8,24,0.6);
}
.breadcrumb .sep{ color: var(--clr-text-3); opacity:.6; }
.breadcrumb .here{ color: var(--clr-blueprint-ink); }

/* =====================================================
   HERO
   ===================================================== */
.hero{
  position:relative;
  padding: 80px 0 60px;
  overflow:hidden;
  background:
    radial-gradient(1100px 600px at 80% 10%, rgba(255,107,53,0.10), transparent 60%),
    radial-gradient(900px 500px at 10% 80%, rgba(99,179,237,0.10), transparent 60%),
    var(--clr-bg);
}
.hero::before{
  content:''; position:absolute; inset:0;
  background: var(--blueprint-grid);
  opacity:0.35; pointer-events:none;
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 80%);
}
.hero::after{
  content:''; position:absolute; left:0; right:0; bottom:0; height:140px;
  background: linear-gradient(to bottom, transparent, var(--clr-bg));
  pointer-events:none;
}

.hero-grid{
  position:relative; z-index:2;
  display:grid; grid-template-columns: 1.05fr 0.95fr;
  gap: 60px; align-items:center;
}
.hero-doc-tag{
  display:inline-flex; gap:10px; align-items:center;
  margin-bottom: 22px;
}
.hero-doc-tag .docno{
  font-family: var(--font-mono); font-size: 11px;
  color: var(--clr-text-3); letter-spacing:.18em;
}

.hero-title{
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(48px, 6.4vw, 92px);
  line-height: 1.02;
  letter-spacing: -0.02em;
  margin: 8px 0 26px;
}
.hero-title em{
  font-style: normal;
  background: linear-gradient(110deg, #FFB066 0%, var(--clr-primary) 45%, var(--clr-gold) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  display: inline-block;
}
.hero-sub{
  max-width: 540px;
  color: var(--clr-text-2);
  font-size: 17px; line-height: 1.6;
  margin-bottom: 32px;
}
.hero-sub b{ color: var(--clr-text); font-weight:600; }

.value-cards{
  display:grid; grid-template-columns: repeat(3,1fr);
  gap:12px; margin-bottom: 36px;
}
.vc{
  padding: 14px 16px;
  border-radius: 10px;
  background: rgba(255,255,255,0.025);
  border: 1px solid var(--clr-border);
  transition: all .2s ease;
}
.vc:hover{ border-color: rgba(255,107,53,0.4); background: rgba(255,107,53,0.05); }
.vc-icon{
  width:32px; height:32px; border-radius: 8px;
  display:grid; place-items:center;
  margin-bottom: 8px;
  background: rgba(255,107,53,0.12); color: var(--clr-primary);
}
.vc-title{ font-size: 13px; font-weight:700; margin-bottom: 2px; }
.vc-desc{ font-size: 11.5px; color: var(--clr-text-2); }

.hero-ctas{ display:flex; gap:12px; flex-wrap:wrap; }

/* Hero blueprint stage */
.hero-stage{
  position:relative;
  aspect-ratio: 1/1;
  background:
    radial-gradient(circle at 50% 50%, rgba(99,179,237,0.10), transparent 60%),
    var(--clr-blueprint-deep);
  border: 1px solid var(--clr-blueprint-line-2);
  border-radius: 16px;
  overflow:hidden;
  box-shadow: inset 0 0 60px rgba(0,0,0,0.5), 0 20px 60px rgba(0,0,0,0.4);
}
.hero-stage::before{
  content:''; position:absolute; inset:0;
  background: var(--blueprint-grid);
  opacity:.7;
}
.hero-stage::after{
  content:''; position:absolute; inset:0;
  background: var(--blueprint-grid-fine);
  opacity:.6;
}
.stage-corner{
  position:absolute; width:18px; height:18px;
  border: 1.5px solid var(--clr-blueprint-ink);
  opacity:.7;
}
.stage-corner.tl{ top:10px; left:10px; border-right:none; border-bottom:none; }
.stage-corner.tr{ top:10px; right:10px; border-left:none; border-bottom:none; }
.stage-corner.bl{ bottom:10px; left:10px; border-right:none; border-top:none; }
.stage-corner.br{ bottom:10px; right:10px; border-left:none; border-top:none; }

.stage-meta{
  position:absolute; left:14px; bottom:14px; right:14px;
  display:flex; justify-content:space-between; align-items:flex-end;
  font-family: var(--font-mono); font-size: 10px;
  color: var(--clr-blueprint-ink-2); letter-spacing:.12em;
  z-index:5;
}
.stage-meta .l{ display:flex; flex-direction:column; gap:2px; }
.stage-meta .r{ text-align:right; display:flex; flex-direction:column; gap:2px; }

/* The doll illustration: pure CSS / SVG */
.doll-svg{
  position:absolute; inset:0;
  width:100%; height:100%;
  z-index:2;
}
.doll-svg .glow{ filter: drop-shadow(0 0 8px rgba(255,107,53,0.6)); }
.doll-svg .pulse-led{ animation: ledpulse 2.2s ease-in-out infinite; }
@keyframes ledpulse{ 0%,100%{ opacity:1;} 50%{ opacity:.45;} }
.doll-svg .scan-line{
  animation: scanY 4s linear infinite;
}
@keyframes scanY{ 0%{ transform: translateY(-30px);} 100%{ transform: translateY(420px);} }

.callout-tag{
  position:absolute; z-index:3;
  font-family: var(--font-mono); font-size: 10px;
  color: var(--clr-blueprint-ink); letter-spacing:.08em;
  background: var(--clr-blueprint-deep);
  padding: 4px 8px; border-radius:4px;
  border:1px solid var(--clr-blueprint-line-2);
  white-space:nowrap;
}
.callout-tag .v{ color: var(--clr-gold); }
.callout-tag::before{
  content:''; position:absolute; width:6px; height:6px; border-radius:50%;
  background: var(--clr-primary); top:50%; transform: translateY(-50%);
  box-shadow: 0 0 8px var(--clr-primary);
}
.callout-tag.left::before{ left:-16px; }
.callout-tag.left{ padding-left:10px; }
.callout-tag.right::before{ right:-16px; }
.callout-tag.right{ padding-right:10px; }
.callout-tag .line{
  position:absolute; height:1px; background: var(--clr-blueprint-ink-2);
  top:50%;
}
.callout-tag.left .line{ left:-12px; width:10px; }
.callout-tag.right .line{ right:-12px; width:10px; }

/* =====================================================
   SPECS BAR
   ===================================================== */
.specs{
  border-top: 1px solid var(--clr-blueprint-line-2);
  border-bottom: 1px solid var(--clr-blueprint-line-2);
  background:
    repeating-linear-gradient(90deg, transparent 0, transparent 38px, rgba(99,179,237,0.06) 38px, rgba(99,179,237,0.06) 40px),
    linear-gradient(180deg, #0E1B36, #091228);
  position:relative; z-index:3;
}
.specs-grid{
  display:grid; grid-template-columns: repeat(4, 1fr);
  padding: 28px 36px;
}
.spec{
  text-align:left;
  padding: 4px 24px;
  border-right: 1px solid rgba(99,179,237,0.18);
  display:flex; flex-direction:column; gap:4px;
}
.spec:last-child{ border-right:none; }
.spec-no{
  font-family: var(--font-mono); font-size: 10px;
  color: var(--clr-blueprint-ink-2); letter-spacing:.18em;
}
.spec-num{
  font-family: var(--font-head); font-weight: 800;
  font-size: 56px; line-height:1; color: var(--clr-gold);
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
  display:flex; align-items:baseline; gap:4px;
}
.spec-num .pre{ font-size: 28px; color: var(--clr-gold); opacity:.85; }
.spec-num .suf{ font-size: 22px; color: var(--clr-gold); opacity:.85; margin-left:2px; }
.spec-label{
  font-size: 13px; color: var(--clr-text-2);
  margin-top: 2px;
}

/* =====================================================
   Section header
   ===================================================== */
.sec-head{
  display:grid; grid-template-columns: 1.2fr 1fr;
  gap: 60px; align-items: end;
  padding: 100px 0 36px;
}
.sec-head .left{ }
.sec-head .right{ color: var(--clr-text-2); font-size: 15px; line-height:1.65; max-width: 460px; }
.sec-title{
  font-family: var(--font-head); font-weight:800;
  font-size: clamp(34px, 4vw, 52px);
  letter-spacing: -0.02em;
  line-height: 1.05;
  margin: 14px 0 0;
}
.sec-title .accent{ color: var(--clr-primary); }
.sec-no{
  font-family: var(--font-mono); font-size: 11px;
  color: var(--clr-text-3); letter-spacing: .2em;
}

/* =====================================================
   SOLUTIONS — tabs + big card
   ===================================================== */
.sol-tabs{
  display:flex; gap:6px; margin-bottom: 26px;
  border-bottom: 1px solid var(--clr-border);
  flex-wrap:wrap;
}
.sol-tab{
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  padding: 16px 22px;
  color: var(--clr-text-2);
  font-family: var(--font-head); font-weight: 700;
  font-size: 14px;
  display:flex; flex-direction:column; gap: 4px;
  align-items: flex-start;
  transition: all .2s ease;
  margin-bottom: -1px;
}
.sol-tab .tabno{
  font-family: var(--font-mono); font-size: 10px;
  letter-spacing: .15em; color: var(--clr-text-3);
}
.sol-tab .tabname{ font-size: 17px; letter-spacing: -.01em; }
.sol-tab .tabsub{ font-size: 11px; color: var(--clr-text-3); font-weight: 600; letter-spacing:.05em; }
.sol-tab:hover{ color: var(--clr-text); }
.sol-tab.active{
  color: var(--clr-primary);
  border-bottom-color: var(--clr-primary);
}
.sol-tab.active .tabno{ color: var(--clr-primary); }
.sol-tab.active .tabsub{ color: var(--clr-primary); opacity:.8; }

.sol-card{
  display:grid; grid-template-columns: 1.05fr 1fr;
  gap: 0;
  border-radius: var(--r-card);
  overflow:hidden;
  border: 1px solid var(--clr-border);
  background: linear-gradient(180deg, var(--clr-surface), var(--clr-bg-2));
  box-shadow: 0 24px 80px -20px rgba(0,0,0,0.6);
  animation: fadeUp .35s ease;
}
@keyframes fadeUp{ from{ opacity:0; transform:translateY(12px);} to{ opacity:1; transform:translateY(0);} }

.sol-left{ padding: 36px 36px 30px; }
.sol-right{
  background:
    radial-gradient(circle at 50% 50%, rgba(99,179,237,0.10), transparent 60%),
    var(--clr-blueprint-deep);
  position:relative; min-height: 600px;
  border-left: 1px solid var(--clr-border);
}
.sol-right::before{
  content:''; position:absolute; inset:0;
  background: var(--blueprint-grid);
  opacity:.6;
}

.sol-tagline{
  font-style: italic;
  font-size: 18px;
  color: var(--clr-gold);
  font-weight: 500;
  margin-bottom: 24px;
  letter-spacing:-.005em;
  border-left: 2px solid var(--clr-gold);
  padding-left: 12px;
}
.sol-header{
  display:flex; justify-content:space-between; align-items:flex-start;
  gap: 20px; margin-bottom: 12px;
}
.sol-name{
  font-family: var(--font-head); font-weight:800;
  font-size: 38px; letter-spacing: -.02em;
  line-height: 1; margin: 0;
}
.sol-sub{
  color: var(--clr-text-2); font-size: 14px;
  margin-top: 4px; font-weight:600;
}
.sol-pitch{ color: var(--clr-text-2); font-size: 14px; line-height:1.55; margin: 0 0 24px; }

.diff-block{
  display:flex; gap: 16px; align-items:center;
  margin-bottom: 22px;
  padding: 12px 14px;
  background: rgba(255,255,255,0.025);
  border: 1px solid var(--clr-border);
  border-radius: 10px;
}
.diff-dots{ display:flex; gap:5px; }
.diff-dots span{
  width:10px; height:10px; border-radius:50%;
  background: var(--clr-border-2);
}
.diff-dots span.on.tone-green{ background: var(--clr-green); box-shadow: 0 0 6px rgba(57,217,138,.6); }
.diff-dots span.on.tone-amber{ background: var(--clr-amber); box-shadow: 0 0 6px rgba(255,179,0,.6); }
.diff-dots span.on.tone-red  { background: var(--clr-red);   box-shadow: 0 0 6px rgba(255,71,87,.6); }
.diff-label{ font-size: 12px; color: var(--clr-text-2); font-family: var(--font-mono); }
.diff-time{ margin-left:auto; font-family: var(--font-mono); font-size: 12px; color: var(--clr-text); }
.diff-time .lab{ color: var(--clr-text-3); margin-right: 6px; }

/* BOM */
.bom-block{ margin: 8px 0 24px; }
.bom-head{
  display:flex; justify-content:space-between; align-items:center;
  margin-bottom: 10px;
}
.bom-head h4{
  font-size: 12px; letter-spacing:.16em; text-transform:uppercase;
  color: var(--clr-text-2); margin:0; font-family: var(--font-mono); font-weight: 700;
}
.bom-presets{ display:flex; gap:6px; }
.bom-preset{
  font-family: var(--font-mono); font-size: 10.5px;
  padding: 5px 10px; border-radius: 6px;
  background: rgba(255,255,255,0.04);
  color: var(--clr-text-2);
  border: 1px solid var(--clr-border);
  font-weight: 600;
}
.bom-preset:hover{ color: var(--clr-primary); border-color: var(--clr-primary); }
.bom-preset.active{ color: var(--clr-primary); border-color: var(--clr-primary); background: var(--clr-primary-dim); }

.bom-table{
  width:100%; border-collapse: collapse;
  font-size: 13px;
  font-family: var(--font-mono);
}
.bom-table th{
  text-align:left; font-weight:600; color: var(--clr-text-3);
  font-size: 10.5px; letter-spacing:.14em;
  padding: 6px 8px;
  border-bottom: 1px solid var(--clr-border);
}
.bom-table th.r{ text-align:right; }
.bom-table td{
  padding: 9px 8px;
  border-bottom: 1px dashed rgba(255,255,255,0.05);
  vertical-align: middle;
}
.bom-table td.r{ text-align:right; }
.bom-table tr:last-child td{ border-bottom: none; }

.bom-row.required td.name{ color: var(--clr-text); }
.bom-row.required td .req-mark{
  font-size: 9px; padding: 1px 5px; border-radius:3px;
  background: rgba(255,107,53,0.15); color: var(--clr-primary);
  margin-left: 6px; letter-spacing:.05em;
  vertical-align: middle;
}
.bom-name{ display:flex; flex-direction:column; }
.bom-spec{ color: var(--clr-text-3); font-size: 10.5px; margin-top: 2px; letter-spacing:.02em; }

.bom-check{
  width: 16px; height: 16px;
  appearance:none; -webkit-appearance:none;
  border: 1.5px solid var(--clr-border-2); border-radius: 4px;
  cursor:pointer; position:relative; vertical-align:middle;
  margin: 0; background: transparent;
  transition: all .15s ease;
}
.bom-check:checked{ background: var(--clr-primary); border-color: var(--clr-primary); }
.bom-check:checked::after{
  content:''; position:absolute; left:4px; top:1px;
  width:5px; height:9px; border:solid #1A0F08; border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}
.bom-check:disabled{ opacity: .55; cursor: not-allowed; }

.bom-total{
  display:flex; justify-content:space-between; align-items:baseline;
  padding: 14px 8px 4px;
  border-top: 2px solid var(--clr-border-2);
  margin-top: 4px;
}
.bom-total .lab{ font-size: 12px; color: var(--clr-text-2); letter-spacing:.12em; font-family: var(--font-mono); text-transform: uppercase; }
.bom-total .val{
  font-family: var(--font-head); font-weight:800;
  font-size: 30px; color: var(--clr-gold);
  font-variant-numeric: tabular-nums;
  transition: color .3s;
}
.bom-total .val.flash{ color:#fff; }

/* Features */
.feats{
  display:flex; flex-wrap:wrap; gap:6px;
  margin: 0 0 24px;
}
.feat{
  display:inline-flex; align-items:center; gap:6px;
  font-size: 11.5px; padding: 5px 10px;
  border-radius: var(--r-tag);
  font-family: var(--font-mono); font-weight:600;
  border: 1px solid;
  letter-spacing:.02em;
}
.feat.on{ color: var(--clr-green); border-color: rgba(57,217,138,0.35); background: rgba(57,217,138,0.06); }
.feat.off{ color: var(--clr-text-3); border-color: var(--clr-border); background: transparent; text-decoration: line-through; opacity:.7; }
.feat .check{ width: 10px; height: 10px; }

.sol-actions{ display:flex; gap:10px; flex-wrap:wrap; }

/* Solution right: hardware exploded view (per-solution illustration) */
.iso-stage{
  position: absolute; inset: 0;
  display:grid; place-items:center;
}
.iso-stage .meta-corner{
  position:absolute; top:14px; right:14px;
  font-family: var(--font-mono); font-size: 10px;
  color: var(--clr-blueprint-ink-2); letter-spacing:.14em;
  text-align: right;
}
.iso-stage .meta-corner b{ display:block; color: var(--clr-blueprint-ink); font-weight:700; }
.iso-stage .scale-bar{
  position:absolute; bottom:14px; left:14px;
  font-family: var(--font-mono); font-size: 10px;
  color: var(--clr-blueprint-ink-2); letter-spacing:.12em;
  display:flex; gap:8px; align-items:center;
}
.iso-stage .scale-bar .bar{ width:60px; height:4px; background: rgba(99,179,237,0.25); border-left:1px solid var(--clr-blueprint-ink); border-right:1px solid var(--clr-blueprint-ink); }

.iso-canvas{
  width: 90%; height: 90%;
  position:relative;
}

/* =====================================================
   ARCHITECTURE
   ===================================================== */
.arch{
  display:grid; grid-template-columns: 1.1fr 0.9fr;
  gap: 32px; align-items: stretch;
}
.arch-viz{
  position:relative;
  border: 1px solid var(--clr-blueprint-line-2);
  border-radius: var(--r-card);
  background:
    radial-gradient(ellipse at 50% 50%, rgba(99,179,237,0.08), transparent 70%),
    var(--clr-blueprint-deep);
  padding: 30px;
  min-height: 540px;
  overflow:hidden;
}
.arch-viz::before{
  content:''; position:absolute; inset:0;
  background: var(--blueprint-grid); opacity:.45;
}
.arch-layers{
  position:relative; z-index:2;
  display:flex; flex-direction:column; gap:16px;
}
.arch-layer{
  position:relative;
  display:grid; grid-template-columns: 100px 1fr auto;
  align-items:center;
  gap: 18px;
  padding: 18px 20px;
  border: 1px solid var(--clr-blueprint-line-2);
  border-radius: 10px;
  background: rgba(14,27,54,0.7);
  backdrop-filter: blur(4px);
  cursor:pointer;
  transition: all .25s ease;
}
.arch-layer:hover, .arch-layer.active{
  border-color: var(--accent);
  background: rgba(14,27,54,0.85);
  box-shadow: 0 0 0 1px var(--accent), 0 0 24px color-mix(in oklab, var(--accent) 30%, transparent);
}
.arch-layer .lno{
  font-family: var(--font-mono); font-size: 11px;
  color: var(--clr-blueprint-ink-2);
  letter-spacing:.14em;
}
.arch-layer .ltitle{ font-family: var(--font-head); font-weight:700; font-size: 18px; color: var(--clr-text); margin-top:2px; }
.arch-layer .litems{
  display:flex; flex-wrap:wrap; gap: 6px 14px;
  font-family: var(--font-mono); font-size: 12px;
  color: var(--clr-text-2);
}
.arch-layer .litems span{ display:inline-flex; align-items:center; gap:6px; }
.arch-layer .litems span::before{
  content:''; width:4px; height:4px; border-radius:50%;
  background: var(--accent);
}
.arch-layer .dot{
  width:14px; height:14px; border-radius:50%;
  background: var(--accent);
  box-shadow: 0 0 12px var(--accent);
}
.arch-layer.dim{ opacity:.35; }

/* data flow connectors */
.flow{
  position:absolute; left: 50%; width:2px;
  background: linear-gradient(180deg, rgba(99,179,237,0.05), rgba(99,179,237,0.5), rgba(99,179,237,0.05));
  z-index:1;
  pointer-events:none;
}
.flow .particle{
  position:absolute; left:-3px; width:8px; height:8px; border-radius:50%;
  background: var(--clr-primary);
  box-shadow: 0 0 10px var(--clr-primary);
  animation: floatUp 3s linear infinite;
}
@keyframes floatUp{ from{ top:100%; opacity:0;} 10%{opacity:1;} 90%{opacity:1;} to{ top:-5px; opacity:0;} }

.arch-side{
  padding: 30px;
  border: 1px solid var(--clr-border);
  border-radius: var(--r-card);
  background: linear-gradient(180deg, var(--clr-surface), var(--clr-bg-2));
  display:flex; flex-direction:column;
  gap: 20px;
}
.arch-side h4{
  font-family: var(--font-mono); font-size: 11px;
  letter-spacing: .18em; color: var(--clr-text-3); text-transform: uppercase;
  margin: 0;
}
.arch-side .laye-title{
  font-family: var(--font-head); font-weight:800;
  font-size: 28px; letter-spacing:-.01em; color: var(--clr-text);
  margin: 0;
}
.arch-side .laye-title .ln{ color: var(--accent); font-family: var(--font-mono); font-size: 14px; margin-right:8px; letter-spacing:.1em; }
.arch-side .laye-desc{ color: var(--clr-text-2); font-size: 14px; line-height:1.6; }
.arch-side .laye-items{
  display:flex; flex-direction:column; gap: 10px;
}
.arch-side .laye-items .row{
  display:flex; align-items:center; gap: 10px;
  padding: 10px 12px;
  background: rgba(255,255,255,0.02);
  border: 1px solid var(--clr-border);
  border-radius: 8px;
  font-family: var(--font-mono); font-size: 12.5px;
}
.arch-side .laye-items .row .pill{
  font-size: 9.5px; padding: 2px 6px; border-radius: 4px;
  background: rgba(255,255,255,0.06); color: var(--clr-text-3);
  letter-spacing:.06em; font-weight:700;
}
.arch-side .laye-foot{
  margin-top: auto;
  padding-top: 18px;
  border-top: 1px solid var(--clr-border);
  font-family: var(--font-mono); font-size: 11px;
  color: var(--clr-text-3); letter-spacing:.06em;
}

/* =====================================================
   HARDWARE SHOWCASE — exploded iso
   ===================================================== */
.hw-stage{
  position:relative;
  display:grid; grid-template-columns: 1fr 360px;
  gap: 32px;
  border: 1px solid var(--clr-blueprint-line-2);
  border-radius: var(--r-card);
  background:
    radial-gradient(ellipse at 30% 40%, rgba(255,107,53,0.08), transparent 60%),
    radial-gradient(ellipse at 70% 70%, rgba(99,179,237,0.08), transparent 60%),
    var(--clr-blueprint-deep);
  overflow:hidden;
  min-height: 620px;
}
.hw-stage::before{
  content:''; position:absolute; inset:0;
  background: var(--blueprint-grid); opacity:.4;
  pointer-events:none;
}
.hw-canvas{
  position:relative;
  display:grid; place-items:center;
  padding: 40px;
}
.hw-panel{
  border-left: 1px solid var(--clr-border);
  padding: 28px 28px;
  background: rgba(14,8,24,0.5);
  display:flex; flex-direction:column;
}
.hw-panel h4{
  font-family: var(--font-mono); font-size: 11px;
  letter-spacing:.16em; color: var(--clr-text-3); text-transform:uppercase;
  margin: 0 0 4px;
}
.hw-panel .part-name{
  font-family: var(--font-head); font-weight:800;
  font-size: 24px; letter-spacing:-.01em;
  margin: 0 0 8px; color: var(--clr-text);
}
.hw-panel .part-tag{
  display:inline-block;
  font-family: var(--font-mono); font-size: 10.5px;
  padding: 3px 8px; border-radius: 4px;
  background: rgba(255,107,53,0.15); color: var(--clr-primary);
  margin-bottom: 18px; letter-spacing:.08em; font-weight:700;
}
.hw-panel .part-desc{ color: var(--clr-text-2); font-size: 14px; line-height:1.65; margin-bottom: 18px; }
.hw-panel .spec-list{ display:flex; flex-direction:column; gap:8px; margin-bottom: 20px; }
.hw-panel .spec-list .row{
  display:flex; justify-content:space-between; align-items:center;
  font-family: var(--font-mono); font-size: 12px;
  padding: 8px 10px; background: rgba(255,255,255,0.02);
  border: 1px solid var(--clr-border); border-radius: 6px;
}
.hw-panel .spec-list .row .k{ color: var(--clr-text-3); }
.hw-panel .spec-list .row .v{ color: var(--clr-text); }
.hw-panel .pin-list{ display:flex; flex-wrap:wrap; gap:4px; }
.hw-panel .pin{
  font-family: var(--font-mono); font-size: 10.5px;
  padding: 3px 7px; border-radius: 4px;
  color: var(--sig-color); border: 1px solid currentColor;
  font-weight:700; letter-spacing:.05em;
  display:inline-flex; align-items:center; gap:4px;
}
.hw-panel .pin .nm{ color: var(--clr-text-2); }

.hw-panel-foot{
  margin-top: auto;
  padding-top: 16px;
  border-top: 1px solid var(--clr-border);
  display:flex; align-items:center; gap:10px;
}
.hw-thumbs{
  display:flex; gap:6px; margin-top: 18px;
  flex-wrap:wrap;
}
.hw-thumb{
  display:inline-flex; align-items:center; gap:6px;
  padding: 6px 10px; border-radius: 6px;
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--clr-border);
  font-family: var(--font-mono); font-size: 10.5px;
  color: var(--clr-text-2);
  cursor:pointer; transition: all .15s ease;
}
.hw-thumb:hover{ color: var(--clr-text); border-color: var(--clr-border-2); }
.hw-thumb.active{ color: var(--clr-primary); border-color: var(--clr-primary); background: var(--clr-primary-dim); }
.hw-thumb .swatch{ width: 8px; height: 8px; border-radius: 2px; }

/* Hardware iso parts */
.iso-part{
  position:absolute; cursor:pointer;
  filter: drop-shadow(0 6px 12px rgba(0,0,0,0.4));
  transition: transform .25s ease, filter .25s ease;
}
.iso-part:hover{ transform: scale(1.05); }
.iso-part.active{ filter: drop-shadow(0 0 14px rgba(255,107,53,0.7)) drop-shadow(0 6px 10px rgba(0,0,0,0.5)); }
.iso-part .label{
  position:absolute; top:-22px; left:50%; transform: translateX(-50%);
  font-family: var(--font-mono); font-size: 10px;
  color: var(--clr-blueprint-ink); letter-spacing:.08em;
  background: var(--clr-blueprint-deep);
  padding: 3px 8px; border-radius: 4px;
  border: 1px solid var(--clr-blueprint-line-2);
  white-space:nowrap;
}
.iso-part.active .label{ color: var(--clr-primary); border-color: var(--clr-primary); }

/* =====================================================
   BUILD STEPS
   ===================================================== */
.steps-bar{
  display:flex; align-items:center; gap: 16px;
  margin-bottom: 16px;
}
.steps-track{
  display:flex; gap: 16px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  padding: 6px 4px 24px;
  margin: 0 -36px;
  padding-left: 36px;
  padding-right: 36px;
  scroll-behavior: smooth;
}
.steps-track::-webkit-scrollbar{ height:6px; }
.steps-track::-webkit-scrollbar-thumb{ background: var(--clr-border-2); border-radius:3px; }
.step-card{
  flex: 0 0 280px;
  height: 360px;
  scroll-snap-align: start;
  border-radius: 12px;
  border: 1px solid var(--clr-border);
  background: linear-gradient(180deg, var(--clr-surface), var(--clr-bg-2));
  padding: 20px;
  display:flex; flex-direction:column;
  position:relative;
  overflow:hidden;
  transition: all .2s ease;
}
.step-card:hover{ border-color: var(--clr-border-2); transform: translateY(-2px); }
.step-card.active{
  border-color: var(--clr-primary);
  background: linear-gradient(180deg, rgba(255,107,53,0.08), var(--clr-bg-2));
  box-shadow: 0 0 0 1px var(--clr-primary), 0 0 32px rgba(255,107,53,0.18);
}
.step-card .num{
  font-family: var(--font-head); font-weight:800;
  font-size: 48px; line-height:1;
  color: var(--clr-primary); margin-bottom: 8px;
  font-variant-numeric: tabular-nums;
  letter-spacing:-.02em;
}
.step-card .num::before{ content: '#'; font-size:24px; color: var(--clr-text-3); margin-right:2px; }
.step-card .divline{ height:1px; background: var(--clr-border); margin: 4px 0 14px; }
.step-card .stepimg{
  height: 140px;
  border-radius: 8px;
  background:
    var(--blueprint-grid-fine),
    radial-gradient(circle at 50% 50%, rgba(255,107,53,0.10), transparent 60%),
    var(--clr-blueprint-deep);
  border: 1px solid var(--clr-blueprint-line-2);
  margin-bottom: 14px;
  position:relative; overflow:hidden;
  display:grid; place-items:center;
}
.step-card .stepimg .badge{
  position:absolute; top:8px; left:8px;
  font-family: var(--font-mono); font-size:9px;
  color: var(--clr-blueprint-ink-2); letter-spacing:.1em;
}
.step-card .stitle{ font-size: 15px; font-weight:700; margin: 0 0 4px; }
.step-card .sdesc{ font-size: 12.5px; color: var(--clr-text-2); line-height:1.5; flex:1; }
.step-card .stime{
  margin-top: 12px; display:flex; align-items:center; gap:6px;
  font-family: var(--font-mono); font-size: 11px;
  color: var(--clr-text-3);
}

.step-card.finale{
  background: linear-gradient(180deg, rgba(255,107,53,0.10), rgba(255,209,102,0.04));
  border: 1px dashed var(--clr-primary);
  display:flex; flex-direction:column; justify-content:center; align-items:center;
  text-align:center;
}
.step-card.finale h4{ font-size: 18px; margin:0 0 8px; }
.step-card.finale p{ font-size: 12.5px; color: var(--clr-text-2); margin:0 0 16px; }

.step-nav{ display:flex; gap:8px; margin-left:auto; }
.step-arrow{
  width: 38px; height: 38px;
  border-radius: 10px;
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--clr-border);
  color: var(--clr-text-2);
  display:grid; place-items:center;
  transition: all .15s ease;
}
.step-arrow:hover{ color: var(--clr-primary); border-color: var(--clr-primary); }

/* =====================================================
   RESOURCES
   ===================================================== */
.res-grid{
  display:grid; grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}
.res-card{
  position:relative;
  padding: 28px 24px;
  border-radius: var(--r-card);
  background: linear-gradient(180deg, var(--clr-surface), var(--clr-bg-2));
  border: 1px solid var(--clr-border);
  transition: all .2s ease;
  display:flex; flex-direction:column;
  overflow:hidden;
}
.res-card::before{
  content:''; position:absolute; top:0; left:0; right:0; height:1px;
  background: linear-gradient(90deg, transparent, var(--tone), transparent);
  opacity:0; transition: opacity .2s;
}
.res-card:hover{ transform: translateY(-3px); border-color: var(--tone); }
.res-card:hover::before{ opacity:1; }

.res-icon{
  width: 56px; height: 56px; border-radius: 14px;
  background: color-mix(in oklab, var(--tone) 14%, transparent);
  color: var(--tone);
  display:grid; place-items:center;
  margin-bottom: 18px;
  border: 1px solid color-mix(in oklab, var(--tone) 28%, transparent);
}
.res-card h4{
  font-family: var(--font-head); font-weight:800;
  font-size: 18px; margin: 0 0 6px;
}
.res-card .sub{ font-size: 12.5px; color: var(--clr-text); margin-bottom: 4px; font-family: var(--font-mono); }
.res-card .extra{ font-size: 11.5px; color: var(--clr-text-3); margin-bottom: 18px; }
.res-card .cta{ margin-top:auto; }

.gh-bar{
  margin-top: 24px;
  padding: 18px 24px;
  border-radius: 12px;
  background: linear-gradient(90deg, rgba(99,179,237,0.06), rgba(255,107,53,0.04));
  border: 1px solid var(--clr-blueprint-line-2);
  display:flex; gap: 36px; align-items:center; justify-content:space-between;
  flex-wrap:wrap;
}
.gh-bar .label{
  font-family: var(--font-mono); font-size: 11px;
  color: var(--clr-text-2); letter-spacing:.15em;
}
.gh-stats{ display:flex; gap: 36px; }
.gh-stat{
  display:flex; align-items:baseline; gap: 8px;
}
.gh-stat .v{
  font-family: var(--font-head); font-weight:800;
  font-size: 26px; color: var(--clr-gold);
  font-variant-numeric: tabular-nums;
}
.gh-stat .k{
  font-family: var(--font-mono); font-size: 11px;
  color: var(--clr-text-2); letter-spacing:.14em; text-transform:uppercase;
}

/* =====================================================
   WIRING DIAGRAM
   ===================================================== */
.wiring-block{
  display:grid; grid-template-columns: 1fr 360px;
  gap: 24px;
  border: 1px solid var(--clr-blueprint-line-2);
  border-radius: var(--r-card);
  background: var(--clr-blueprint-deep);
  overflow:hidden;
}
.wiring-canvas{
  position:relative;
  background:
    var(--blueprint-grid-fine),
    radial-gradient(circle at 50% 50%, rgba(99,179,237,0.06), transparent 70%);
  min-height: 480px;
  padding: 24px;
}
.wiring-side{
  background: rgba(14,8,24,0.5);
  padding: 24px;
  border-left: 1px solid var(--clr-border);
  display:flex; flex-direction:column; gap: 16px;
}
.wiring-side h4{
  font-family: var(--font-mono); font-size: 11px;
  letter-spacing:.18em; color: var(--clr-text-3); margin:0 0 4px;
}
.legend{
  display:flex; flex-direction:column; gap: 8px;
}
.legend-row{
  display:flex; align-items:center; gap:12px;
  padding: 8px 10px;
  background: rgba(255,255,255,0.02);
  border: 1px solid var(--clr-border);
  border-radius: 6px;
  cursor:pointer;
  transition: all .15s;
}
.legend-row:hover{ border-color: var(--col); background: color-mix(in oklab, var(--col) 8%, transparent); }
.legend-row .ln{
  width: 28px; height: 3px; background: var(--col);
  border-radius: 2px;
  box-shadow: 0 0 6px var(--col);
}
.legend-row .nm{ font-family: var(--font-mono); font-size: 12px; color: var(--clr-text); flex:1; }
.legend-row .ct{ font-family: var(--font-mono); font-size: 10.5px; color: var(--clr-text-3); }

/* =====================================================
   QUIZ
   ===================================================== */
.quiz-block{
  padding: 36px;
  border-radius: var(--r-card);
  background:
    radial-gradient(ellipse at 80% 0%, rgba(255,107,53,0.12), transparent 60%),
    linear-gradient(180deg, var(--clr-surface), var(--clr-bg-2));
  border: 1px solid var(--clr-border);
  position:relative; overflow:hidden;
}
.quiz-block::before{
  content:''; position:absolute; inset:0;
  background: var(--blueprint-grid); opacity: .12;
}
.quiz-inner{ position:relative; }
.quiz-prog{
  display:flex; align-items:center; gap: 12px;
  margin-bottom: 24px;
  font-family: var(--font-mono); font-size: 11px;
  color: var(--clr-text-2); letter-spacing:.14em;
}
.quiz-prog .bar{
  height: 3px; flex:1; border-radius: 2px;
  background: rgba(255,255,255,0.08); overflow:hidden;
}
.quiz-prog .bar i{ display:block; height:100%; background: var(--clr-primary); transition: width .35s ease; }

.quiz-q{
  font-family: var(--font-head); font-weight:800;
  font-size: 28px; letter-spacing:-.01em;
  line-height: 1.2; margin: 0 0 24px;
}
.quiz-opts{ display:grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-bottom: 24px; }
.quiz-opt{
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--clr-border);
  border-radius: 10px;
  padding: 20px 18px;
  text-align:left;
  color: var(--clr-text);
  transition: all .15s ease;
  display:flex; gap: 14px; align-items:center;
}
.quiz-opt .ic{ font-size: 24px; }
.quiz-opt .tx{ font-size: 14px; line-height: 1.4; }
.quiz-opt:hover{ border-color: var(--clr-border-2); background: rgba(255,255,255,0.05); }
.quiz-opt.sel{ border-color: var(--clr-primary); background: var(--clr-primary-dim); }

.quiz-foot{ display:flex; justify-content:space-between; align-items:center; }
.quiz-skip{ font-family: var(--font-mono); font-size: 11px; color: var(--clr-text-3); background: none; border:none; }
.quiz-skip:hover{ color: var(--clr-text-2); }

.quiz-result{
  display:grid; grid-template-columns: auto 1fr auto; gap: 28px; align-items:center;
}
.quiz-badge{
  width: 92px; height: 92px;
  border-radius: 22px;
  display:grid; place-items:center;
  font-size: 42px;
  background: rgba(255,107,53,0.15);
  border: 1.5px solid var(--clr-primary);
  color: var(--clr-primary);
}
.quiz-result h3{ font-family: var(--font-head); font-weight: 800; font-size: 24px; margin: 0 0 6px; letter-spacing:-.01em;}
.quiz-result h3 b{ color: var(--clr-primary); }
.quiz-result p{ color: var(--clr-text-2); font-size: 13.5px; line-height:1.55; margin:0; }

/* =====================================================
   COMMUNITY WALL
   ===================================================== */
.comm-grid{
  column-count: 3;
  column-gap: 16px;
}
@media (max-width: 900px){ .comm-grid{ column-count: 2; } }
@media (max-width: 600px){ .comm-grid{ column-count: 1; } }
.comm-card{
  break-inside: avoid;
  margin-bottom: 16px;
  border-radius: 12px;
  border: 1px solid var(--clr-border);
  background: var(--clr-surface);
  overflow:hidden;
  transition: all .2s ease;
}
.comm-card:hover{ border-color: var(--clr-border-2); transform: translateY(-2px); }
.comm-image{
  position:relative;
  background:
    var(--blueprint-grid-fine),
    linear-gradient(135deg, rgba(255,107,53,0.10), rgba(184,169,201,0.10)),
    var(--clr-blueprint-deep);
  display:grid; place-items:center;
  border-bottom: 1px solid var(--clr-border);
}
.comm-image .photo-tag{
  position:absolute; top:10px; left:10px;
  font-family: var(--font-mono); font-size: 9.5px;
  color: var(--clr-blueprint-ink-2); letter-spacing:.1em;
}
.comm-image .doll-icon{
  font-size: 56px; filter: grayscale(.2) opacity(.7);
}
.comm-meta{
  padding: 14px 16px;
}
.comm-meta .row1{
  display:flex; justify-content:space-between; align-items:center;
  margin-bottom: 8px;
}
.comm-meta .author{ font-family: var(--font-mono); font-size: 12px; color: var(--clr-text); font-weight: 700; }
.comm-meta .pill{
  font-family: var(--font-mono); font-size: 9.5px;
  padding: 2px 6px; border-radius: 4px;
  background: rgba(255,107,53,0.14); color: var(--clr-primary);
  letter-spacing:.06em; font-weight:700;
}
.comm-meta .desc{ font-size: 12.5px; color: var(--clr-text-2); line-height: 1.5; margin:0; }

/* =====================================================
   ROADMAP
   ===================================================== */
.road-grid{
  display:grid; grid-template-columns: 1fr 1fr; gap: 24px;
}
.road-card{
  padding: 32px;
  border-radius: var(--r-card);
  border: 1px solid var(--clr-border);
  background: linear-gradient(180deg, var(--clr-surface), var(--clr-bg-2));
}
.road-card h3{
  font-family: var(--font-head); font-weight: 800;
  font-size: 22px; margin: 0 0 8px;
}
.road-card .sub{ color: var(--clr-text-2); font-size: 13.5px; margin-bottom: 24px; }

.road-line{
  display:flex; flex-direction:column; gap: 4px;
  margin-bottom: 28px;
}
.road-step{
  display:grid; grid-template-columns: 28px 1fr auto;
  gap: 14px; align-items:center;
  padding: 12px 0;
  border-bottom: 1px dashed var(--clr-border);
}
.road-step:last-child{ border-bottom: none; }
.road-step .ic{
  width: 22px; height: 22px; border-radius: 50%;
  display:grid; place-items:center;
  font-family: var(--font-mono); font-size: 10px; font-weight:800;
}
.road-step.done .ic{ background: var(--clr-green); color: #07150D; }
.road-step.now .ic{ background: var(--clr-primary); color: #1A0F08; box-shadow: 0 0 0 4px rgba(255,107,53,0.18); }
.road-step.todo .ic{ background: rgba(255,255,255,0.06); color: var(--clr-text-3); border: 1px dashed var(--clr-border-2); }
.road-step .tx{ font-size: 14px; }
.road-step .tx b{ font-weight: 700; }
.road-step .tx small{ display:block; color: var(--clr-text-3); font-size: 11.5px; margin-top: 2px; font-family: var(--font-mono); }
.road-step .dt{ font-family: var(--font-mono); font-size: 11px; color: var(--clr-text-2); }

.cmp-table{ width:100%; border-collapse: collapse; font-size: 13px; }
.cmp-table th, .cmp-table td{
  padding: 11px 8px; text-align:left;
  border-bottom: 1px dashed var(--clr-border);
}
.cmp-table th{
  font-family: var(--font-mono); font-size: 10px;
  letter-spacing:.16em; color: var(--clr-text-3);
  text-transform:uppercase; font-weight:700;
}
.cmp-table td.c{ text-align:center; }
.cmp-table .ck{ color: var(--clr-green); font-weight:700; }
.cmp-table .xx{ color: var(--clr-text-3); }
.cmp-table .nt{ color: var(--clr-text); font-family: var(--font-mono); font-size: 11px; }

/* =====================================================
   FOOTER
   ===================================================== */
.footer{
  margin-top: 100px;
  padding: 48px 0 28px;
  border-top: 1px solid var(--clr-border);
  background: var(--clr-bg-2);
  color: var(--clr-text-3);
}
.footer-grid{
  display:grid; grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px; margin-bottom: 36px;
}
.footer h5{
  font-family: var(--font-mono); font-size: 10.5px;
  letter-spacing:.16em; color: var(--clr-text-2); text-transform:uppercase;
  margin: 0 0 14px;
}
.footer ul{ list-style:none; padding:0; margin:0; display:flex; flex-direction:column; gap:8px; font-size: 13px; }
.footer a:hover{ color: var(--clr-text); }
.footer-bottom{
  display:flex; justify-content:space-between; align-items:center;
  padding-top: 24px; border-top: 1px solid var(--clr-border);
  font-family: var(--font-mono); font-size: 11px;
  letter-spacing:.08em;
}

/* =====================================================
   Responsive
   ===================================================== */
@media (max-width: 1100px){
  .hero-grid{ grid-template-columns: 1fr; gap: 40px; }
  .hero-stage{ max-width: 480px; margin: 0 auto; }
  .arch{ grid-template-columns: 1fr; }
  .hw-stage{ grid-template-columns: 1fr; }
  .wiring-block{ grid-template-columns: 1fr; }
  .sol-card{ grid-template-columns: 1fr; }
  .sol-right{ min-height: 360px; border-left: none; border-top: 1px solid var(--clr-border); }
  .res-grid{ grid-template-columns: repeat(2, 1fr); }
  .road-grid{ grid-template-columns: 1fr; }
  .specs-grid{ grid-template-columns: repeat(2, 1fr); }
  .spec{ border-right: none; border-bottom: 1px solid rgba(99,179,237,0.18); padding: 14px 24px; }
  .specs-grid > .spec:nth-last-child(-n+2){ border-bottom: none; }
  .sec-head{ grid-template-columns: 1fr; gap: 16px; }
  .quiz-opts{ grid-template-columns: 1fr; }
}
@media (max-width: 700px){
  .wrap{ padding: 0 20px; }
  .topstrip-inner{ padding: 12px 20px; gap: 12px; }
  .nav{ display:none; }
  .breadcrumb{ padding: 8px 20px; }
  .hero{ padding: 50px 0 30px; }
  .value-cards{ grid-template-columns: 1fr; }
  .footer-grid{ grid-template-columns: 1fr 1fr; }
  .res-grid{ grid-template-columns: 1fr; }
  .sol-tab .tabsub{ display:none; }
  .sol-left{ padding: 24px; }
  .quiz-result{ grid-template-columns: 1fr; }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce){
  *{ animation: none !important; transition: none !important; }
}