:root {
  --bg: #090c11;
  --s1: #10141c;
  --s2: #171d29;
  --s3: #1f2637;
  --border: rgba(150,180,220,0.07);
  --border2: rgba(150,180,220,0.14);
  --brand: #4fa8ff;
  --brand-dim: rgba(79,168,255,0.5);
  --accent: #00c896;
  --accent2: #f97316;
  --accent3: #3b82f6;
  --red: #ef4444;
  --text: #e2e8f0;
  --text2: #7789a3;
  --text3: #334155;
  --mono: 'Space Mono', monospace;
  --sans: 'Outfit', sans-serif;
  --radius: 10px;
  --grid-line: rgba(79,168,255,0.035);
  --ease: cubic-bezier(0.16,1,0.3,1);
  --dur-fast: 120ms;
  --dur-base: 200ms;
}
[data-theme="light"] {
  --bg: #ffffff; --s1: #f8fafc; --s2: #e2e8f0; --s3: #cbd5e1;
  --border: rgba(20,60,110,0.08); --border2: rgba(20,60,110,0.16);
  --brand: #1d6fc4; --brand-dim: rgba(29,111,196,0.45);
  --accent: #059669; --accent2: #ea580c; --accent3: #2563eb;
  --red: #dc2626; --text: #1e293b; --text2: #526277; --text3: #94a3b8;
  --grid-line: rgba(29,111,196,0.05);
}
@media (prefers-color-scheme: light) {
  :root:not([data-theme]) {
    --bg: #ffffff; --s1: #f8fafc; --s2: #e2e8f0; --s3: #cbd5e1;
    --border: rgba(20,60,110,0.08); --border2: rgba(20,60,110,0.16);
    --brand: #1d6fc4; --brand-dim: rgba(29,111,196,0.45);
    --accent: #059669; --accent2: #ea580c; --accent3: #2563eb;
    --red: #dc2626; --text: #1e293b; --text2: #526277; --text3: #94a3b8;
    --grid-line: rgba(29,111,196,0.05);
  }
}
*{box-sizing:border-box;margin:0;padding:0;}
html{scroll-behavior:smooth;}
body{background:var(--bg);color:var(--text);font-family:var(--sans);font-size:14px;min-height:100vh;overflow-x:hidden;}
::selection{background:var(--brand);color:#071522;}
::-webkit-scrollbar{width:10px;height:10px;}
::-webkit-scrollbar-track{background:transparent;}
::-webkit-scrollbar-thumb{background:var(--border2);border-radius:6px;border:2px solid var(--s1);}
::-webkit-scrollbar-thumb:hover{background:var(--brand-dim);}
@media (prefers-reduced-motion: reduce){
  *,*::before,*::after{animation-duration:0.01ms!important;animation-iteration-count:1!important;transition-duration:0.01ms!important;scroll-behavior:auto!important;}
}

/* TOPBAR */
.topbar{display:flex;align-items:center;justify-content:space-between;padding:12px 24px;background:var(--s1);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:100;}
.brand{display:flex;align-items:center;gap:10px;}
.brand-icon{width:28px;height:28px;background:var(--brand);clip-path:polygon(50% 0%,100% 100%,0% 100%);}
.brand-name{font-family:var(--mono);font-size:15px;letter-spacing:2px;color:var(--text);}
.brand-ver{font-size:10px;font-family:var(--mono);color:var(--brand);margin-left:6px;opacity:.8;}
.topbar-right{display:flex;align-items:center;gap:8px;}
.pill{font-size:10px;font-family:var(--mono);padding:3px 10px;border-radius:20px;border:1px solid var(--border2);color:var(--text2);letter-spacing:1px;}
.pill.kenya{border-color:var(--brand);color:var(--brand);}

/* LAYOUT */
.layout{display:grid;grid-template-columns:300px 1fr;min-height:calc(100vh - 53px);}

/* DESKTOP APP SHELL — sidebar scrolls independently, main view (diagrams) stays
   pinned and fully visible instead of scrolling away with the sidebar. */
@media (min-width:769px){
  html, body{height:100%;}
  body{overflow:hidden;}
  .layout{height:calc(100vh - 53px); min-height:0;}
  .main{overflow-y:auto;}
}

/* SIDEBAR */
.sidebar{background:var(--s1);border-right:1px solid var(--border);padding:18px;overflow-y:auto;display:flex;flex-direction:column;gap:14px;}
.sec-label{font-size:9px;letter-spacing:3px;text-transform:uppercase;color:var(--text3);font-family:var(--mono);margin-bottom:8px;}
.sec{background:var(--s2);border:1px solid var(--border);border-radius:var(--radius);padding:14px;}

/* Beam type */
.beam-grid{display:grid;grid-template-columns:1fr 1fr 1fr;gap:6px;}
.btype{background:var(--s3);border:1px solid var(--border);border-radius:8px;padding:8px 4px;text-align:center;cursor:pointer;transition:all var(--dur-fast) var(--ease);color:var(--text2);font-size:11px;}
.btype:hover{border-color:var(--brand);color:var(--text);}
.btype.on{border-color:var(--brand);background:rgba(79,168,255,.08);color:var(--brand);}
.btype svg{display:block;margin:0 auto 4px;}

/* Section type */
.sec-grid{display:grid;grid-template-columns:1fr 1fr;gap:6px;}
.stype{background:var(--s3);border:1px solid var(--border);border-radius:8px;padding:8px;text-align:center;cursor:pointer;transition:all var(--dur-fast) var(--ease);color:var(--text2);font-size:11px;}
.stype:hover{border-color:var(--accent3);color:var(--text);}
.stype.on{border-color:var(--accent3);background:rgba(59,130,246,.08);color:var(--accent3);}
.stype canvas{display:block;margin:0 auto 4px;}

/* Load type */
.load-grid{display:grid;grid-template-columns:1fr 1fr 1fr;gap:6px;}
.ltype{background:var(--s3);border:1px solid var(--border);border-radius:8px;padding:8px;text-align:center;cursor:pointer;transition:all var(--dur-fast) var(--ease);color:var(--text2);font-size:11px;}
.ltype:hover{border-color:var(--accent2);color:var(--text);}
.ltype.on{border-color:var(--accent2);background:rgba(249,115,22,.08);color:var(--accent2);}

/* Controls */
.ctrl{margin-bottom:12px;}
.ctrl:last-child{margin-bottom:0;}
.ctrl-row{display:flex;justify-content:space-between;margin-bottom:5px;}
.ctrl-name{color:var(--text2);font-size:12px;}
.ctrl-val{font-family:var(--mono);font-size:12px;color:var(--text);}
input[type=range]{appearance:none;-webkit-appearance:none;width:100%;height:2px;background:var(--s3);border-radius:1px;outline:none;}
input[type=range]::-webkit-slider-thumb{appearance:none;-webkit-appearance:none;width:13px;height:13px;background:var(--brand);border-radius:50%;cursor:pointer;transition:transform var(--dur-fast) var(--ease);}
input[type=range]::-webkit-slider-thumb:hover{transform:scale(1.4);}
select{width:100%;padding:7px 10px;background:var(--s3);border:1px solid var(--border);border-radius:8px;color:var(--text);font-family:var(--sans);font-size:12px;outline:none;cursor:pointer;}
.theme-select{width:auto;min-width:120px;padding:6px 10px;background:var(--s3);border:1px solid var(--border);border-radius:10px;color:var(--text);font-family:var(--sans);font-size:12px;cursor:pointer;}

/* Section library toggle */
.sec-mode-row{display:flex;gap:6px;margin-bottom:10px;}
.sec-mode-btn{flex:1;padding:5px;background:var(--s3);border:1px solid var(--border);border-radius:6px;color:var(--text2);font-size:10px;font-family:var(--mono);cursor:pointer;text-align:center;letter-spacing:1px;transition:all var(--dur-fast) var(--ease);}
.sec-mode-btn.on{border-color:var(--accent3);color:var(--accent3);background:rgba(59,130,246,.08);}

/* MODE TOGGLE (Beam / Slab) */
.mode-toggle{display:flex;gap:6px;}
.mode-btn{flex:1;padding:8px;background:var(--s3);border:1px solid var(--border);border-radius:8px;color:var(--text2);font-size:12px;font-family:var(--sans);font-weight:600;cursor:pointer;text-align:center;transition:all var(--dur-fast) var(--ease);}
.mode-btn:hover{border-color:var(--brand);color:var(--text);}
.mode-btn.on{border-color:var(--brand);background:rgba(79,168,255,.08);color:var(--brand);}

/* SLAB */
.slab-type-badge{margin-top:10px;padding:7px 10px;border-radius:8px;font-family:var(--mono);font-size:10px;letter-spacing:1px;text-align:center;background:rgba(59,130,246,.08);border:1px solid rgba(59,130,246,.25);color:var(--accent3);}
#stdSecWrap{display:none;}
#stdSecWrap select{margin-top:4px;}
.std-sec-info{margin-top:8px;padding:8px 10px;background:var(--s3);border-radius:8px;font-family:var(--mono);font-size:10px;color:var(--text2);line-height:1.8;}
.std-sec-info span{color:var(--accent);}

/* Load position row — only shown for point load */
#loadPosWrap{margin-top:10px;}

/* Kenya Code Results */
.code-results{display:flex;flex-direction:column;gap:6px;}
.code-item{display:flex;align-items:center;justify-content:space-between;padding:8px 10px;border-radius:8px;border:1px solid var(--border);}
.code-item.pass{background:rgba(0,200,150,.07);border-color:rgba(0,200,150,.2);}
.code-item.fail{background:rgba(239,68,68,.07);border-color:rgba(239,68,68,.2);}
.code-item.warn{background:rgba(249,115,22,.07);border-color:rgba(249,115,22,.2);}
.code-name{font-size:11px;color:var(--text2);}
.code-badge{font-size:10px;font-family:var(--mono);padding:2px 8px;border-radius:10px;}
.badge-pass{background:rgba(0,200,150,.15);color:var(--accent);}
.badge-fail{background:rgba(239,68,68,.15);color:var(--red);}
.badge-warn{background:rgba(249,115,22,.15);color:var(--accent2);}
.code-val{font-size:10px;font-family:var(--mono);color:var(--text2);margin-top:2px;}

/* Cost Card */
.cost-card{background:var(--s2);border:1px solid var(--border);border-radius:var(--radius);padding:14px;}
.cost-grid{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-top:10px;}
.cost-item{background:var(--s3);border-radius:8px;padding:10px;}
.cost-label{font-size:10px;color:var(--text2);margin-bottom:4px;}
.cost-val{font-family:var(--mono);font-size:13px;color:var(--text);}
.cost-val.total{color:var(--accent2);font-size:15px;}
.cost-note{font-size:9px;color:var(--text3);margin-top:8px;font-family:var(--mono);}
.cost-price-row{display:flex;justify-content:space-between;align-items:center;margin-bottom:8px;}
.cost-price-input{width:90px;padding:4px 8px;background:var(--s3);border:1px solid var(--border);border-radius:6px;color:var(--accent2);font-family:var(--mono);font-size:12px;outline:none;text-align:right;}

/* MAIN — faint drafting grid, reads as material not decoration */
.main{
  padding:18px;display:flex;flex-direction:column;gap:14px;overflow:hidden;
  background-color:var(--bg);
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size:32px 32px;
}

/* ─── BOTTOM SHEET (mobile only) ──────────────────────────────────────────── */
.sheet-handle{display:none;}

/* Mobile compliance status bar — hidden on desktop */
.mobile-status-bar{display:none;}


/* Tabs */
.tabs{display:flex;gap:6px;}
.tab{padding:6px 16px;border:1px solid var(--border);border-radius:20px;font-size:12px;cursor:pointer;color:var(--text2);background:transparent;transition:all var(--dur-fast) var(--ease);font-family:var(--sans);}
.tab:hover{color:var(--text);border-color:var(--brand-dim);}
.tab.on{background:var(--brand);border-color:var(--brand);color:#071522;font-weight:600;}
.tab.ai-tab.on{background:linear-gradient(135deg,#6366f1,#8b5cf6);border-color:#6366f1;color:#fff;}
.tab.ai-tab{border-color:#6366f1;color:#6366f1;display:inline-flex;align-items:center;gap:6px;}
.tab-lock{font-family:var(--mono);font-size:8px;font-weight:700;letter-spacing:0.5px;background:rgba(99,102,241,.18);border:1px solid rgba(99,102,241,.4);color:#a5b4fc;padding:1px 5px;border-radius:4px;}

/* Canvas panels — register-mark corners, like crop marks on a drawing sheet */
.panel{
  background-color:var(--s1);
  background-image:
    linear-gradient(var(--brand-dim),var(--brand-dim)),
    linear-gradient(var(--brand-dim),var(--brand-dim)),
    linear-gradient(var(--brand-dim),var(--brand-dim)),
    linear-gradient(var(--brand-dim),var(--brand-dim)),
    linear-gradient(var(--brand-dim),var(--brand-dim)),
    linear-gradient(var(--brand-dim),var(--brand-dim)),
    linear-gradient(var(--brand-dim),var(--brand-dim)),
    linear-gradient(var(--brand-dim),var(--brand-dim));
  background-repeat:no-repeat;
  background-size:14px 2px,2px 14px,14px 2px,2px 14px,14px 2px,2px 14px,14px 2px,2px 14px;
  background-position:
    4px 4px, 4px 4px,
    calc(100% - 18px) 4px, calc(100% - 6px) 4px,
    4px calc(100% - 6px), 4px calc(100% - 18px),
    calc(100% - 18px) calc(100% - 6px), calc(100% - 6px) calc(100% - 18px);
  border:1px solid var(--border);border-radius:var(--radius);padding:18px;
}
.panel-label{font-size:9px;letter-spacing:3px;text-transform:uppercase;color:var(--text3);font-family:var(--mono);margin-bottom:12px;}
canvas{display:block;width:100%;}

/* Metrics strip — 6 columns now (added shear) — same register-mark language, smaller scale */
.metrics{display:grid;grid-template-columns:repeat(6,1fr);gap:8px;}
.metric{
  background-color:var(--s2);
  background-image:
    linear-gradient(var(--brand-dim),var(--brand-dim)),
    linear-gradient(var(--brand-dim),var(--brand-dim)),
    linear-gradient(var(--brand-dim),var(--brand-dim)),
    linear-gradient(var(--brand-dim),var(--brand-dim)),
    linear-gradient(var(--brand-dim),var(--brand-dim)),
    linear-gradient(var(--brand-dim),var(--brand-dim)),
    linear-gradient(var(--brand-dim),var(--brand-dim)),
    linear-gradient(var(--brand-dim),var(--brand-dim));
  background-repeat:no-repeat;
  background-size:8px 1.5px,1.5px 8px,8px 1.5px,1.5px 8px,8px 1.5px,1.5px 8px,8px 1.5px,1.5px 8px;
  background-position:
    3px 3px, 3px 3px,
    calc(100% - 11px) 3px, calc(100% - 4.5px) 3px,
    3px calc(100% - 4.5px), 3px calc(100% - 11px),
    calc(100% - 11px) calc(100% - 4.5px), calc(100% - 4.5px) calc(100% - 11px);
  border:1px solid var(--border);border-radius:8px;padding:10px 12px;
}
.metric-label{font-size:10px;color:var(--text2);margin-bottom:4px;}
.metric-val{font-family:var(--mono);font-size:14px;color:var(--text);}
.metric-val.ok{color:var(--accent);}
.metric-val.warn{color:var(--accent2);}
.metric-val.fail{color:var(--red);}

/* Legend */
.legend{display:flex;gap:16px;flex-wrap:wrap;margin-top:10px;}
.leg{display:flex;align-items:center;gap:5px;font-size:11px;color:var(--text2);}
.leg-line{width:18px;height:2px;border-radius:1px;}

/* Optimizer */
.optimize-btn{width:100%;padding:9px;background:transparent;border:1px solid var(--accent3);border-radius:8px;color:var(--accent3);font-family:var(--mono);font-size:11px;cursor:pointer;letter-spacing:1px;text-transform:uppercase;transition:all var(--dur-fast) var(--ease);}
.optimize-btn:hover{background:rgba(59,130,246,.1);}
.optimize-btn:disabled{opacity:.4;cursor:not-allowed;}
.optimize-btn.locked{border-color:#6366f1;color:#a5b4fc;}
.optimize-btn.locked:hover{background:rgba(99,102,241,.1);}
.optimize-result{margin-top:10px;padding:10px 12px;border-radius:8px;font-size:12px;line-height:1.6;}
.optimize-result.pass{background:rgba(0,200,150,.07);border:1px solid rgba(0,200,150,.25);}
.optimize-result.fail{background:rgba(239,68,68,.07);border:1px solid rgba(239,68,68,.2);color:var(--red);}
.sec-label-row{display:flex;align-items:center;justify-content:space-between;margin-bottom:8px;}
.sec-label-row .sec-label{margin-bottom:0;}
.optimizer-locked{position:relative;}
.optimize-name{font-family:var(--mono);font-size:13px;color:var(--accent);font-weight:700;}
.optimize-meta{font-size:11px;color:var(--text2);margin-bottom:8px;}
.optimize-apply-btn{padding:5px 12px;background:var(--accent);border:none;border-radius:6px;color:#000;font-family:var(--mono);font-size:10px;font-weight:700;cursor:pointer;letter-spacing:1px;transition:opacity var(--dur-fast) var(--ease);}
.optimize-apply-btn:hover{opacity:.85;}

/* Saved Projects */
.saves-list{display:flex;flex-direction:column;gap:6px;}
.saves-empty{font-size:11px;color:var(--text3);font-family:var(--mono);padding:6px 0;}
.save-item{display:flex;align-items:center;justify-content:space-between;padding:8px 10px;background:var(--s3);border:1px solid var(--border);border-radius:8px;gap:8px;}
.save-info{flex:1;min-width:0;}
.save-name{font-size:12px;color:var(--text);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;}
.save-meta{font-size:10px;color:var(--text2);font-family:var(--mono);margin-top:2px;}
.save-actions{display:flex;gap:5px;flex-shrink:0;}
.save-load-btn{padding:4px 10px;background:var(--accent3);border:none;border-radius:6px;color:#fff;font-family:var(--mono);font-size:10px;cursor:pointer;transition:opacity var(--dur-fast) var(--ease);}
.save-load-btn:hover{opacity:.8;}
.save-del-btn{padding:4px 8px;background:rgba(239,68,68,.15);border:1px solid rgba(239,68,68,.2);border-radius:6px;color:var(--red);font-size:11px;cursor:pointer;transition:all var(--dur-fast) var(--ease);}
.save-del-btn:hover{background:rgba(239,68,68,.25);}
.save-btn{width:100%;padding:9px;background:transparent;border:1px solid var(--accent3);border-radius:8px;color:var(--accent3);font-family:var(--mono);font-size:11px;cursor:pointer;letter-spacing:1px;text-transform:uppercase;transition:all var(--dur-fast) var(--ease);}
.save-btn:hover{background:rgba(59,130,246,.1);}

/* Export */
.export-btn{width:100%;padding:11px;background:transparent;border:1px solid var(--accent);border-radius:8px;color:var(--accent);font-family:var(--mono);font-size:11px;cursor:pointer;letter-spacing:2px;text-transform:uppercase;transition:all var(--dur-fast) var(--ease);margin-top:4px;}
.export-btn:hover{background:rgba(0,200,150,.1);}
.export-btn:disabled{opacity:.4;cursor:not-allowed;}

/* Compliance stamp — reads like an engineering approval seal, not a UI pill */
.stamp{
  display:flex;align-items:center;gap:10px;padding:9px 14px;border-radius:6px;
  font-size:11px;font-family:var(--mono);font-weight:700;letter-spacing:1.5px;text-transform:uppercase;
  border:1.5px solid;transform:rotate(-0.5deg);
}
.stamp.ok{background:rgba(0,200,150,.07);border-color:rgba(0,200,150,.35);color:var(--accent);box-shadow:0 0 0 3px rgba(0,200,150,.05);}
.stamp.fail{background:rgba(239,68,68,.07);border-color:rgba(239,68,68,.35);color:var(--red);box-shadow:0 0 0 3px rgba(239,68,68,.05);}
.stamp-dot{width:8px;height:8px;border-radius:2px;transform:rotate(45deg);flex-shrink:0;}
.stamp-dot.ok{background:var(--accent);}
.stamp-dot.fail{background:var(--red);}

/* Impact moment — fires once, only on an actual pass↔fail transition (see setComplianceState in app.js) */
@keyframes stampImpact{
  0%   { transform: rotate(-5deg) scale(1.24); opacity:.55; }
  55%  { transform: rotate(0.6deg) scale(0.93); opacity:1; }
  78%  { transform: rotate(-1.3deg) scale(1.035); }
  100% { transform: rotate(-0.5deg) scale(1); }
}
.stamp.stamp-impact{ animation: stampImpact 420ms var(--ease); }
.mobile-status-bar.stamp-impact{ animation: stampImpact 420ms var(--ease); }

/* AI CHAT */
#viewAI{display:none;flex-direction:column;gap:0;}
.ai-panel{
  background-color:var(--s1);
  background-image:
    linear-gradient(var(--brand-dim),var(--brand-dim)),
    linear-gradient(var(--brand-dim),var(--brand-dim)),
    linear-gradient(var(--brand-dim),var(--brand-dim)),
    linear-gradient(var(--brand-dim),var(--brand-dim)),
    linear-gradient(var(--brand-dim),var(--brand-dim)),
    linear-gradient(var(--brand-dim),var(--brand-dim)),
    linear-gradient(var(--brand-dim),var(--brand-dim)),
    linear-gradient(var(--brand-dim),var(--brand-dim));
  background-repeat:no-repeat;
  background-size:14px 2px,2px 14px,14px 2px,2px 14px,14px 2px,2px 14px,14px 2px,2px 14px;
  background-position:
    4px 4px, 4px 4px,
    calc(100% - 18px) 4px, calc(100% - 6px) 4px,
    4px calc(100% - 6px), 4px calc(100% - 18px),
    calc(100% - 18px) calc(100% - 6px), calc(100% - 6px) calc(100% - 18px);
  border:1px solid var(--border);border-radius:var(--radius);display:flex;flex-direction:column;height:500px;
}
.ai-header{padding:14px 18px;border-bottom:1px solid var(--border);display:flex;align-items:center;gap:10px;}
.ai-dot{width:8px;height:8px;border-radius:50%;background:#6366f1;box-shadow:0 0 8px #6366f1;animation:pulse 2s infinite;}
@keyframes pulse{0%,100%{opacity:1;}50%{opacity:.4;}}
.ai-title{font-family:var(--mono);font-size:12px;color:var(--text);letter-spacing:1px;}
.ai-subtitle{font-size:10px;color:var(--text2);margin-left:auto;}
.ai-messages{flex:1;overflow-y:auto;padding:16px;display:flex;flex-direction:column;gap:12px;scroll-behavior:smooth;}
.ai-msg{max-width:85%;padding:10px 14px;border-radius:12px;font-size:13px;line-height:1.6;}
.ai-msg.user{background:rgba(99,102,241,.15);border:1px solid rgba(99,102,241,.25);color:var(--text);align-self:flex-end;border-radius:12px 12px 2px 12px;}
.ai-msg.assistant{background:var(--s2);border:1px solid var(--border);color:var(--text);align-self:flex-start;border-radius:12px 12px 12px 2px;}
.ai-msg.thinking{color:var(--text2);font-style:italic;font-size:12px;animation:pulse 1.4s ease-in-out infinite;}
.ai-msg.error{background:rgba(239,68,68,.07);border:1px solid rgba(239,68,68,.2);color:var(--red);align-self:flex-start;border-radius:12px 12px 12px 2px;font-size:12px;}
.ai-footer{padding:12px 14px;border-top:1px solid var(--border);display:flex;gap:8px;align-items:center;}
.ai-input{flex:1;padding:9px 12px;background:var(--s3);border:1px solid var(--border);border-radius:8px;color:var(--text);font-family:var(--sans);font-size:13px;outline:none;transition:border-color var(--dur-fast) var(--ease);}
.ai-input:focus{border-color:#6366f1;}
.ai-send{padding:9px 16px;background:#6366f1;border:none;border-radius:8px;color:#fff;font-family:var(--mono);font-size:11px;cursor:pointer;letter-spacing:1px;transition:opacity var(--dur-fast) var(--ease);}
.ai-send:hover{opacity:.85;}
.ai-send:disabled{opacity:.4;cursor:not-allowed;}
.ai-chips{display:flex;gap:6px;flex-wrap:wrap;padding:0 14px 10px;}
.ai-chip{padding:4px 10px;background:var(--s3);border:1px solid rgba(99,102,241,.3);border-radius:20px;font-size:10px;color:#818cf8;cursor:pointer;font-family:var(--mono);transition:all var(--dur-fast) var(--ease);white-space:nowrap;}
.ai-chip:hover{background:rgba(99,102,241,.15);border-color:#6366f1;}

/* PAYWALL */
.ai-paywall{background:var(--s1);border:1px solid var(--border);border-radius:var(--radius);display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;height:500px;padding:40px 30px;position:relative;overflow:hidden;}
.ai-paywall::before{content:'';position:absolute;width:400px;height:400px;border-radius:50%;background:radial-gradient(circle,rgba(99,102,241,.12) 0%,transparent 70%);top:50%;left:50%;transform:translate(-50%,-50%);pointer-events:none;}
.paywall-icon{width:56px;height:56px;border-radius:16px;background:linear-gradient(135deg,#6366f1,#8b5cf6);display:flex;align-items:center;justify-content:center;font-family:var(--mono);font-size:15px;font-weight:700;letter-spacing:1px;color:#fff;margin-bottom:18px;box-shadow:0 8px 30px rgba(99,102,241,.35);position:relative;}
.paywall-title{font-family:var(--sans);font-size:19px;font-weight:600;margin-bottom:8px;position:relative;}
.paywall-sub{color:var(--text2);font-size:13px;max-width:340px;line-height:1.6;margin-bottom:22px;position:relative;}
.paywall-features{display:flex;flex-direction:column;gap:8px;margin-bottom:26px;text-align:left;position:relative;}
.paywall-feature{display:flex;align-items:center;gap:8px;font-size:12px;color:var(--text);}
.paywall-feature::before{content:'';width:4px;height:4px;border-radius:50%;background:#8b5cf6;flex-shrink:0;}
.paywall-btn{padding:12px 28px;background:linear-gradient(135deg,#6366f1,#8b5cf6);color:#fff;border:none;border-radius:10px;font-family:var(--mono);font-size:11px;letter-spacing:1.5px;text-transform:uppercase;cursor:pointer;font-weight:700;transition:opacity var(--dur-fast) var(--ease),transform var(--dur-fast) var(--ease);position:relative;}
.paywall-btn:hover{opacity:.9;transform:translateY(-1px);}
.paywall-note{margin-top:12px;font-size:10px;color:var(--text3);font-family:var(--mono);position:relative;}

/* In-app dialogs — same register-mark language as .panel, so an interruption still looks like it belongs to the product */
.dlg-overlay{
  position:fixed;inset:0;background:rgba(3,5,8,.6);
  display:flex;align-items:center;justify-content:center;padding:20px;
  z-index:1000;opacity:0;pointer-events:none;
  transition:opacity var(--dur-base) var(--ease);
}
.dlg-overlay.open{opacity:1;pointer-events:auto;}
.dlg-box{
  background-color:var(--s1);
  background-image:
    linear-gradient(var(--brand-dim),var(--brand-dim)),linear-gradient(var(--brand-dim),var(--brand-dim)),
    linear-gradient(var(--brand-dim),var(--brand-dim)),linear-gradient(var(--brand-dim),var(--brand-dim)),
    linear-gradient(var(--brand-dim),var(--brand-dim)),linear-gradient(var(--brand-dim),var(--brand-dim)),
    linear-gradient(var(--brand-dim),var(--brand-dim)),linear-gradient(var(--brand-dim),var(--brand-dim));
  background-repeat:no-repeat;
  background-size:14px 2px,2px 14px,14px 2px,2px 14px,14px 2px,2px 14px,14px 2px,2px 14px;
  background-position:
    4px 4px,4px 4px,calc(100% - 18px) 4px,calc(100% - 6px) 4px,
    4px calc(100% - 6px),4px calc(100% - 18px),calc(100% - 18px) calc(100% - 6px),calc(100% - 6px) calc(100% - 18px);
  border:1px solid var(--border2);border-radius:var(--radius);
  padding:22px;width:min(340px,100%);
  transform:translateY(8px) scale(.98);transition:transform var(--dur-base) var(--ease);
}
.dlg-overlay.open .dlg-box{transform:translateY(0) scale(1);}
.dlg-msg{font-family:var(--sans);font-size:13px;color:var(--text);line-height:1.5;margin-bottom:16px;white-space:pre-line;}
.dlg-input{width:100%;background:var(--s3);border:1px solid var(--border2);border-radius:8px;color:var(--text);font-family:var(--sans);font-size:13px;padding:9px 12px;margin-bottom:16px;}
.dlg-input:focus-visible{outline:1.5px solid var(--brand);outline-offset:1px;}
.dlg-actions{display:flex;justify-content:flex-end;gap:8px;}
.dlg-btn{font-family:var(--mono);font-size:11px;letter-spacing:1px;text-transform:uppercase;padding:8px 16px;border-radius:6px;cursor:pointer;border:1px solid var(--border2);background:transparent;color:var(--text2);transition:all var(--dur-fast) var(--ease);}
.dlg-btn:hover{border-color:var(--brand-dim);color:var(--text);}
.dlg-btn:active{transform:scale(.97);}
.dlg-btn.primary{background:var(--brand);border-color:var(--brand);color:#071522;font-weight:700;}
.dlg-btn.primary:hover{opacity:.9;}

/* Pressed states — every clickable control confirms the tap registered */
.btype:active, .stype:active, .ltype:active, .mode-btn:active, .sec-mode-btn:active,
.tab:active, .optimize-btn:active, .save-btn:active, .export-btn:active,
.optimize-apply-btn:active, .save-load-btn:active, .save-del-btn:active,
.ai-send:active, .ai-chip:active, .paywall-btn:active {
  transform: scale(0.97);
}
.tab.on:active { transform: scale(0.98); }

/* Focus states — brand blue, consistent across every interactive control */
button:focus-visible, select:focus-visible, input:focus-visible, .btype:focus-visible, .ltype:focus-visible, .stype:focus-visible, .tab:focus-visible, .mode-btn:focus-visible, .sec-mode-btn:focus-visible, .sheet-handle:focus-visible, .ai-chip:focus-visible {
  outline:1.5px solid var(--brand);
  outline-offset:2px;
}
/* ===== MOBILE OVERRIDES — kept last so these always win the cascade ===== */
@media (max-width:768px){
  .layout{display:block;position:relative;min-height:calc(100vh - 53px);}
  .main{padding:10px;padding-bottom:80px;gap:8px;}

  /* Compliance status bar */
  .mobile-status-bar{
    display:flex;align-items:center;gap:8px;
    padding:7px 12px;border-radius:8px;
    font-family:var(--mono);font-size:11px;letter-spacing:1px;
    border:1px solid;
  }
  .mobile-status-bar.ok{background:color-mix(in srgb, var(--s1) 90%, var(--accent) 10%);border-color:rgba(0,200,150,.3);color:var(--accent);}
  .mobile-status-bar.fail{background:color-mix(in srgb, var(--s1) 90%, var(--red) 10%);border-color:rgba(239,68,68,.3);color:var(--red);}
  .msb-dot{width:7px;height:7px;border-radius:50%;flex-shrink:0;}
  .msb-dot.ok{background:var(--accent);}
  .msb-dot.fail{background:var(--red);}

  /* Metrics: 2×2 — hide Allow.deflection (#2) and Max shear (#5), both visible on diagram */
  .metrics{grid-template-columns:repeat(2,1fr);gap:6px;}
  .metric:nth-child(2),.metric:nth-child(5){display:none;}
  .metric{padding:8px 10px;background-image:none;} /* corner marks stay on .panel only at this size — 16 tiny brackets across 4 cards reads as noise, not craft */
  .metric-label{font-size:9px;line-height:1.3;}
  .metric-val{font-size:13px;}

  /* Tabs */
  .tabs{display:flex;gap:6px;overflow-x:auto;-webkit-overflow-scrolling:touch;scrollbar-width:none;flex-wrap:nowrap;padding-right:20px;-webkit-mask-image:linear-gradient(90deg,#000 calc(100% - 24px),transparent 100%);mask-image:linear-gradient(90deg,#000 calc(100% - 24px),transparent 100%);}
  .tabs::-webkit-scrollbar{display:none;}
  .tab{white-space:nowrap;flex-shrink:0;padding:6px 12px;font-size:11px;}

  /* Panels & canvas */
  .panel{padding:10px;}
  .panel-label{font-size:8px;margin-bottom:8px;}
  #c2d{max-height:240px;}
  #c3d{max-height:240px;}
  #cSec{max-height:240px;}

  /* Legend */
  .legend{flex-direction:row;flex-wrap:wrap;gap:8px;}
  .leg{font-size:10px;}

  /* AI panel */
  .ai-panel{height:calc(100vh - 240px);}

  /* Topbar */
  .topbar{padding:10px 14px;}
  .topbar-right .pill{display:none;}
  .topbar-right .pill.kenya{display:inline-flex;}

  /* Cost */
  .cost-grid{grid-template-columns:1fr 1fr;}

  /* BOTTOM SHEET */
  .sidebar{
    position:fixed;
    bottom:0;left:0;right:0;
    z-index:200;
    border-right:none;
    border-top:1px solid var(--border2);
    border-radius:16px 16px 0 0;
    padding:0 16px 24px;
    max-height:80vh;
    overflow-y:auto;
    transform:translateY(calc(100% - 52px));
    transition:transform 0.35s cubic-bezier(0.32,0.72,0,1);
    background:var(--s1);
    box-shadow:0 -8px 40px rgba(0,0,0,0.4);
  }
  .sidebar.open{transform:translateY(0);}

  .sheet-handle{
    display:flex;
    flex-direction:column;
    align-items:center;
    justify-content:center;
    padding:10px 0 8px;
    cursor:pointer;
    position:sticky;
    top:0;
    background:var(--s1);
    z-index:2;
    gap:4px;
  }
  .sheet-handle-bar{width:36px;height:4px;border-radius:2px;background:var(--border2);}
  .sheet-handle-label{font-family:var(--mono);font-size:9px;letter-spacing:2px;color:var(--text2);text-transform:uppercase;}
}