/* ═══════════════════════════════════════════════════════════════
   StructuralWind — UI v2 design layer
   Loaded after style.css. Tokens, typography, components, icons,
   focus states, responsive behaviour. Layout geometry (fixed panel
   offsets) is intentionally unchanged so the app logic keeps working.
   ═══════════════════════════════════════════════════════════════ */

:root{
  --font:'Inter','Segoe UI Variable','Segoe UI',system-ui,-apple-system,Roboto,sans-serif;
  --mono:'JetBrains Mono','Cascadia Mono',Consolas,ui-monospace,monospace;
  --bg:#0d1220; --bg2:#121a2e; --bg3:#182340;
  --surface:#141d33; --surface2:#1a2542; --surface3:#223056;
  --primary:#38bdf8; --primary-dim:#0e7fb0; --primary-light:rgba(56,189,248,.14);
  --accent:#8b7bff; --accent2:#c084fc;
  --success:#34d399; --warn:#fbbf24; --danger:#f87171;
  --text:#e6ebf7; --text2:#9aa8c4; --text3:#6b7a99;
  --border:#263455; --border-strong:#33456d;
  --radius:10px; --radius-sm:7px;
  --shadow:0 10px 30px rgba(3,8,20,.45);
  --ring:0 0 0 3px rgba(56,189,248,.32);
  --ease:cubic-bezier(.2,.7,.2,1);
}
body.light{
  --bg:#f3f5fa; --bg2:#ffffff; --bg3:#e9edf5;
  --surface:#ffffff; --surface2:#f1f4f9; --surface3:#e5eaf3;
  --primary:#0a67c2; --primary-dim:#0b5aa8; --primary-light:rgba(10,103,194,.10);
  --accent:#5b45e0;
  --text:#141b2e; --text2:#4a5673; --text3:#8290ab;
  --border:#d8deea; --border-strong:#c3cce0;
  --shadow:0 10px 30px rgba(30,45,90,.14);
  --ring:0 0 0 3px rgba(10,103,194,.25);
}
html.pre-light{background:#f3f5fa}

html,body{font-family:var(--font);font-size:13px;line-height:1.4;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
body{background:var(--bg)}
::selection{background:var(--primary-light);color:var(--text)}

/* collapsible sections */
.sw-sec-h{cursor:pointer;user-select:none;position:relative;padding-right:18px}
.sw-sec-h::after{content:'';position:absolute;right:2px;top:50%;width:7px;height:7px;margin-top:-6px;border-right:2px solid var(--text3);border-bottom:2px solid var(--text3);transform:rotate(45deg);transition:transform .15s var(--ease)}
.sw-sec-h:hover{color:var(--text)}
.panel-section.sw-collapsed>.sw-sec-h{margin-bottom:0}
.panel-section.sw-collapsed>.sw-sec-h::after{transform:rotate(-45deg);margin-top:-4px}
.panel-section.sw-collapsed>*:not(.sw-sec-h){display:none!important}

/* icons */
.ic{width:16px;height:16px;flex:none;display:inline-block;vertical-align:-3px;color:currentColor}
button .ic{margin-right:0}

/* accessibility */
.skip-link{position:fixed;left:8px;top:-60px;z-index:9999;background:var(--primary);color:#fff;padding:8px 14px;border-radius:8px;font-weight:700;text-decoration:none;transition:top .15s}
.skip-link:focus{top:8px}
:focus-visible{outline:none;box-shadow:var(--ring);border-radius:var(--radius-sm)}
button:focus-visible,select:focus-visible,input:focus-visible,summary:focus-visible,[role=button]:focus-visible{box-shadow:var(--ring)}
@media (prefers-reduced-motion:reduce){*{animation-duration:.001ms!important;transition-duration:.001ms!important}}

/* typography */
h3{font-size:11px;letter-spacing:.09em;color:var(--text2);font-weight:700;margin-bottom:10px;display:flex;align-items:center;gap:6px}
h4{color:var(--text2);letter-spacing:.08em}
label{color:var(--text2);font-size:11.5px;font-weight:500;margin-bottom:3px;display:flex;justify-content:space-between;align-items:baseline;gap:8px}
label span{color:var(--text);font-weight:700;font-variant-numeric:tabular-nums;font-family:var(--mono);font-size:11.5px}
.check-label,.wind-field label,.info-row label{display:block}
a{color:var(--primary)}
sub,sup{font-size:.72em}

/* form controls */
select,input[type=text],input[type=number],input[type=search]{font-family:inherit;background:var(--surface2);border:1px solid var(--border);color:var(--text);border-radius:var(--radius-sm);font-size:12px;padding:6px 9px;transition:border-color .15s,box-shadow .15s,background .15s}
select:hover,input[type=text]:hover,input[type=number]:hover{border-color:var(--border-strong)}
select:focus,input:focus{border-color:var(--primary);box-shadow:var(--ring)}
input[type=number]{-moz-appearance:textfield}
input[type=number]::-webkit-outer-spin-button,input[type=number]::-webkit-inner-spin-button{opacity:.5}
input[type=range]{height:6px;background:linear-gradient(90deg,var(--primary) var(--fill,0%),var(--surface3) var(--fill,0%));border-radius:99px;margin:6px 0 12px}
input[type=range]::-webkit-slider-thumb{width:16px;height:16px;background:#fff;border:2px solid var(--primary);box-shadow:0 1px 4px rgba(0,0,0,.35);transition:transform .12s var(--ease)}
input[type=range]::-webkit-slider-thumb:hover{transform:scale(1.15)}
input[type=range]::-moz-range-thumb{width:14px;height:14px;background:#fff;border:2px solid var(--primary);border-radius:50%}
input[type=checkbox]{accent-color:var(--primary)}
button{font-family:inherit}

/* slider + numeric field (added by ui-v2.js) */
.sw-num-row{display:flex;align-items:center;gap:10px;margin:0 0 4px}
.sw-num-row input[type=range]{flex:1;min-width:0;margin:6px 0}
.sw-num-row input.sw-num{width:64px;flex:none;margin:0;padding:4px 6px;text-align:right;font-family:var(--mono);font-size:11.5px}

/* ═══ Top nav ═══ */
.top-nav{background:color-mix(in srgb,var(--bg2) 92%,transparent);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-bottom:1px solid var(--border);padding:0 14px;gap:10px}
.nav-brand{min-width:0;gap:10px;color:var(--text)}
.brand-icon{width:28px;height:28px;border-radius:9px;display:grid;place-items:center;background:linear-gradient(135deg,var(--primary),var(--accent));color:#fff;box-shadow:0 4px 14px rgba(56,189,248,.35)}
.brand-icon .ic{width:16px;height:16px;vertical-align:0}
.brand-text{font-size:14px;font-weight:800;letter-spacing:-.01em;color:var(--text)}
.brand-tagline{font-size:9.5px;letter-spacing:.06em;color:var(--text3);font-weight:600}
.main-tabs{margin-left:18px;gap:4px;padding:3px;background:var(--surface);border:1px solid var(--border);border-radius:11px}
.main-tab{display:inline-flex;align-items:center;gap:7px;padding:6px 14px;font-size:12px;font-weight:600;letter-spacing:.01em;border-radius:8px;border:none;color:var(--text2);height:auto}
.main-tab:hover{background:var(--surface2);color:var(--text)}
.main-tab.active{background:var(--primary-light);color:var(--primary);border-bottom:none;box-shadow:inset 0 0 0 1px color-mix(in srgb,var(--primary) 35%,transparent)}
.nav-right{gap:6px}
.nav-icon-btn,.btn-account{width:30px;height:30px;display:grid;place-items:center;border-radius:9px;border:1px solid transparent;background:transparent;color:var(--text2);padding:0;transition:all .15s}
.nav-icon-btn:hover,.btn-account:hover{background:var(--surface2);color:var(--text);border-color:var(--border)}
.btn-account{border-color:var(--border);background:var(--surface)}
.btn-upgrade{border:none;background:linear-gradient(135deg,var(--accent),var(--primary));color:#fff;font-weight:700;font-size:11.5px;padding:6px 14px;border-radius:9px;box-shadow:0 4px 14px rgba(139,123,255,.35);transition:transform .15s var(--ease),box-shadow .15s}
.btn-upgrade:hover{transform:translateY(-1px);box-shadow:0 6px 18px rgba(139,123,255,.45)}
.save-indicator{font-size:10.5px;color:var(--text3);padding:0 8px;opacity:.9;transition:color .2s,opacity .2s;white-space:nowrap}
.save-indicator.saving{color:var(--warn)}
.save-indicator.saved::before{content:'';display:inline-block;width:6px;height:6px;border-radius:50%;background:var(--success);margin-right:6px;vertical-align:1px}

/* account menu */
.account-menu{border:1px solid var(--border);background:var(--surface);border-radius:12px;box-shadow:var(--shadow);padding:6px;min-width:220px}
.acct-header{padding:8px 8px 10px}
.acct-avatar{width:32px;height:32px;border-radius:50%;display:grid;place-items:center;background:var(--primary-light);color:var(--primary)}
.acct-name{font-weight:700;color:var(--text)}
.acct-plan{color:var(--text3);font-size:11px}
.acct-divider{background:var(--border);height:1px;margin:2px 4px 6px}
.account-menu button{display:flex;align-items:center;gap:10px;width:100%;text-align:left;padding:8px 10px;border-radius:8px;border:none;background:transparent;color:var(--text);font-size:12.5px}
.account-menu button .ic{color:var(--text3)}
.account-menu button:hover{background:var(--surface2)}
.account-menu button:hover .ic{color:var(--primary)}

/* auth */
.auth-overlay{backdrop-filter:blur(8px);background:rgba(6,10,22,.6)}
.auth-card{border:1px solid var(--border);background:var(--surface);border-radius:18px;box-shadow:var(--shadow);padding:30px 28px;text-align:center}
.auth-mark{width:48px;height:48px;border-radius:14px;margin:0 auto 14px;display:grid;place-items:center;background:linear-gradient(135deg,var(--primary),var(--accent));color:#fff}
.auth-mark .ic{width:24px;height:24px;vertical-align:0}
.auth-card h2{color:var(--text);font-size:19px;font-weight:800;letter-spacing:-.01em}
.auth-card p{color:var(--text2)}
.btn-google,.btn-microsoft{border-radius:10px;font-weight:600;border:1px solid var(--border-strong);background:var(--surface2);color:var(--text)}
.btn-google:hover,.btn-microsoft:hover{background:var(--surface3)}
.auth-guest{background:transparent;border:none;color:var(--primary);cursor:pointer;margin-top:10px;font-size:12px;font-weight:600}
.auth-guest:hover{text-decoration:underline}

/* ═══ Sub-tabs ═══ */
.structure-subtabs{background:color-mix(in srgb,var(--bg2) 88%,transparent);border-bottom:1px solid var(--border);padding:0 12px;gap:4px;align-items:center}
.struct-subtab{border:none;background:transparent;color:var(--text2);font-size:12px;font-weight:600;padding:5px 12px;border-radius:7px;letter-spacing:.01em}
.struct-subtab:hover{background:var(--surface2);color:var(--text)}
.struct-subtab.active{background:var(--primary-light);color:var(--primary);border-bottom:none}

/* ═══ Toolbars ═══ */
.toolbar,.model-upload-bar{background:color-mix(in srgb,var(--bg2) 90%,transparent);border-bottom:1px solid var(--border);gap:4px}
.toolbar{padding:0 10px;overflow-x:auto;overflow-y:hidden;scrollbar-width:none}
.toolbar::-webkit-scrollbar{display:none}
.toolbar button,.model-upload-bar button,.model-upload-bar .upload-model-btn,.doc-toolbar button,.topo-controls button{display:inline-flex;align-items:center;gap:6px;background:transparent;border:1px solid transparent;color:var(--text2);border-radius:8px;font-size:11.5px;font-weight:600;padding:5px 9px;white-space:nowrap;transition:background .12s,color .12s,border-color .12s}
.toolbar button:hover,.model-upload-bar button:hover,.doc-toolbar button:hover,.topo-controls button:hover{background:var(--surface2);color:var(--text);border-color:var(--border)}
.toolbar button.active{background:var(--primary-light);color:var(--primary);border-color:color-mix(in srgb,var(--primary) 40%,transparent)}
.toolbar button.locked,#btn-lock.locked,#btn-lock-site.locked{background:rgba(251,191,36,.14);color:var(--warn);border-color:rgba(251,191,36,.4)}
.toolbar-divider{width:1px;height:18px;background:var(--border);margin:0 6px;flex:none}
.model-upload-bar{font-size:11px}
.beta-badge{background:var(--primary-light);color:var(--primary);border:1px solid color-mix(in srgb,var(--primary) 40%,transparent);border-radius:99px;padding:1px 7px;font-size:9px;font-weight:800;letter-spacing:.06em}

/* ═══ Panels ═══ */
.panel-left,.panel-right,.site-left-panel{background:var(--bg2);border-color:var(--border);scrollbar-width:thin}
.panel-left,.site-left-panel{padding:12px}
.panel-right{padding:12px}
.panel-section{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:12px;margin-bottom:10px;box-shadow:none}
.panel-section>h3:first-child{margin-bottom:10px}
.section-header{color:var(--text2);font-size:10.5px}
.panel-right h3.pressure-rhs-heading{color:var(--text);font-size:13px;letter-spacing:0;text-transform:none;font-weight:800;margin:2px 2px 10px}
.panel-note{border:none;background:transparent}
.panel-note summary{color:var(--text3);font-size:11px;font-weight:600}
.panel-note p{color:var(--text2);font-size:11px;line-height:1.5}
.ifc-dropzone{border:1.5px dashed var(--border-strong);background:var(--surface2);border-radius:10px;transition:all .15s}
.ifc-dropzone:hover,.ifc-dropzone.dragover{border-color:var(--primary);background:var(--primary-light)}
.ifc-dropzone-icon{color:var(--primary)}
.ifc-dropzone-icon .ic{width:22px;height:22px;vertical-align:0}
.ifc-dropzone-text{font-weight:700;color:var(--text)}
.ifc-dropzone-sub{color:var(--text3)}
.ifc-class-banner{border-radius:8px}

/* segmented buttons */
.btn-row{gap:0}
.btn-row button,.btn-row.seg-row button.seg-btn,.btn-row.rooftype-row button.rooftype-btn,.btn-row.rooftype-row button.planform-btn,.limitstate-row .limitstate-btn{background:var(--surface2);color:var(--text2);border:1px solid var(--border);font-size:11.5px;font-weight:600;padding:6px 8px;transition:all .12s}
.btn-row button:first-child{border-radius:8px 0 0 8px}
.btn-row button:last-child{border-radius:0 8px 8px 0}
.btn-row button:only-child{border-radius:8px}
.btn-row button+button{margin-left:-1px}
.btn-row button:hover{background:var(--surface3);color:var(--text);position:relative;z-index:1}
.btn-row button.active,.btn-row.seg-row button.seg-btn.active,.btn-row.rooftype-row button.rooftype-btn.active,.btn-row.rooftype-row button.planform-btn.active,.limitstate-row .limitstate-btn.active{background:var(--primary-light);color:var(--primary);border-color:var(--primary);position:relative;z-index:2}
.limitstate-row .limitstate-btn.active{background:var(--primary);color:#fff}
body.light .limitstate-row .limitstate-btn.active{color:#fff}

/* permeability grid */
.perm-grid{gap:5px}
.perm-btn{border-radius:9px;background:var(--surface2);color:var(--text2);padding:8px 2px 6px}
.perm-btn .ic{width:16px;height:16px;vertical-align:0}
.perm-btn:hover{border-color:var(--primary-dim);color:var(--text)}
.perm-btn.active{background:var(--primary-light);border-color:var(--primary);color:var(--primary)}
.perm-btn.detected{background:rgba(52,211,153,.12);border-color:var(--success);color:var(--success)}
.perm-clause{background:var(--surface2);border-left:2px solid var(--primary);border-radius:6px;color:var(--text2);font-style:normal}

/* key/value rows */
.info-row{display:flex;align-items:center;justify-content:space-between;gap:8px;padding:3px 0;border-bottom:1px dashed color-mix(in srgb,var(--border) 60%,transparent)}
.info-row:last-of-type{border-bottom:none}
.info-row label{margin:0;flex:1}
.info-row span,.computed{font-family:var(--mono);font-variant-numeric:tabular-nums}
.computed{color:var(--primary);font-weight:700}
.kc-case-header{color:var(--text);font-weight:700;font-size:11.5px}
.kc-case-divider{border-color:var(--border)}
.wind-field{display:flex;align-items:center;gap:8px;margin-bottom:6px}
.wind-field label{flex:1;margin:0}
.wind-field input{width:84px;margin:0;text-align:right;font-family:var(--mono);font-weight:700}
.highlight-green{background:var(--primary-light)!important;color:var(--primary)!important;border-color:color-mix(in srgb,var(--primary) 45%,transparent)!important}
.region-readonly{display:inline-block;padding:4px 12px;border-radius:99px;background:var(--primary-light);color:var(--primary);font-weight:800;border:1px solid color-mix(in srgb,var(--primary) 35%,transparent);margin:2px 0 8px}

/* direction tabs */
.dir-tabs{display:flex;flex-wrap:wrap;gap:3px;margin-bottom:8px}
.dir-tab{background:var(--surface2);color:var(--text2);border:1px solid var(--border);border-radius:7px;padding:4px 9px;font-size:11px;font-weight:700}
.dir-tab:hover{color:var(--text);border-color:var(--border-strong)}
.dir-tab.active{background:var(--primary-light);color:var(--primary);border-color:var(--primary)}

/* ═══ Results strip over 3D ═══ */
.results-strip{gap:8px}
.rs-card{background:color-mix(in srgb,var(--bg2) 82%,transparent);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border:1px solid var(--border);border-radius:11px;box-shadow:0 6px 20px rgba(3,8,20,.25)}
.rs-label{color:var(--text3);font-weight:600;letter-spacing:.06em}
.rs-value{font-family:var(--mono);font-variant-numeric:tabular-nums;color:var(--text)}

/* face tooltip, compass */
.face-info{background:color-mix(in srgb,var(--bg2) 94%,transparent);backdrop-filter:blur(12px);border:1px solid var(--border);border-radius:12px;box-shadow:var(--shadow)}
.face-info h4{color:var(--text);font-size:12px;letter-spacing:.02em;text-transform:none}
.fi-lbl{color:var(--text2)}
.fi-val{font-family:var(--mono);color:var(--text)}
.wind-compass{border-radius:50%;box-shadow:0 6px 20px rgba(3,8,20,.35)}

/* ═══ Tables ═══ */
.press-table{border-collapse:separate;border-spacing:0;width:100%;font-size:11.5px}
.press-table th{background:var(--surface2);color:var(--text2);font-weight:700;font-size:10px;letter-spacing:.06em;padding:7px 8px;border-bottom:1px solid var(--border-strong);position:sticky;top:0;z-index:1}
.press-table td{padding:6px 8px;border-bottom:1px solid var(--border);font-variant-numeric:tabular-nums;font-family:var(--mono);font-size:11.5px}
.press-table td.label-cell{font-family:var(--font);font-weight:600}
.press-table tbody tr:hover{background:var(--primary-light)}
.press-table td.neg{color:#ff8a8a}
.press-table td.pos{color:var(--success)}
body.light .press-table td.neg{color:#c62828}
body.light .press-table td.pos{color:#0f8a5f}
.ptab{background:transparent;border:none;color:var(--text2);border-radius:7px;font-weight:600;padding:5px 12px}
.ptab:hover{background:var(--surface2);color:var(--text)}
.ptab.active{background:var(--primary-light);color:var(--primary)}
.model-pressure-tables .pressure-tables-drawer{border:1px solid var(--border);border-radius:12px 12px 0 0;background:var(--surface)}
.model-pressure-tables .pressure-tables-drawer .topo-card-header{background:var(--surface);}

/* ═══ Detailed report ═══ */
.doc-toolbar{background:var(--bg2);border-bottom:1px solid var(--border);gap:6px;padding:8px 14px;position:sticky;top:0;z-index:3}
.doc-toolbar button{background:var(--surface);border-color:var(--border)}
.doc-toolbar button:first-child{background:var(--primary);color:#fff;border-color:var(--primary)}
.doc-toolbar button:first-child:hover{filter:brightness(1.1)}
.doc-preview{background:var(--bg)}

/* ═══ Map ═══ */
.map-find-address-bar{background:color-mix(in srgb,var(--bg2) 90%,transparent);backdrop-filter:blur(12px);border:1px solid var(--border);border-radius:14px;box-shadow:var(--shadow)}
.map-address-input{background:transparent;border:none;color:var(--text);box-shadow:none!important}
.map-find-address-btn{background:var(--primary);color:#fff;border:none;border-radius:10px;font-weight:700}
body.light .map-find-address-btn{color:#fff}
.map-address-suggestions{background:var(--surface);border:1px solid var(--border);border-radius:12px;box-shadow:var(--shadow);overflow:hidden}
.map-address-suggestions li:hover,.map-address-suggestions li.active{background:var(--primary-light)}
.map-overlay-info{background:color-mix(in srgb,var(--bg2) 88%,transparent);backdrop-filter:blur(10px);border:1px solid var(--border);border-radius:10px;color:var(--text2);font-size:11px}
.map-overlay-info b{font-family:var(--mono);color:var(--text)}
.map-controls-bar,.map-orientation-bar{background:color-mix(in srgb,var(--bg2) 90%,transparent);backdrop-filter:blur(12px);border:1px solid var(--border);border-radius:12px;box-shadow:var(--shadow);gap:4px}
.map-controls-bar button,.map-orientation-bar button{display:inline-flex;align-items:center;gap:6px;background:transparent;border:1px solid transparent;color:var(--text2);border-radius:8px;font-size:11.5px;font-weight:600;padding:6px 10px}
.map-controls-bar button:hover,.map-orientation-bar button:hover{background:var(--surface2);color:var(--text);border-color:var(--border)}
.map-controls-bar button.active{background:var(--primary-light);color:var(--primary);border-color:color-mix(in srgb,var(--primary) 40%,transparent)}
.map-ctrl-divider{background:var(--border)}
.map-overlay-legend{background:color-mix(in srgb,var(--bg2) 92%,transparent);backdrop-filter:blur(10px);border:1px solid var(--border);border-radius:12px}
.leaflet-control-zoom a{background:var(--surface)!important;color:var(--text)!important;border-color:var(--border)!important}
.leaflet-control-zoom a:hover{background:var(--surface2)!important}
.leaflet-bar{border:1px solid var(--border)!important;border-radius:10px!important;overflow:hidden;box-shadow:var(--shadow)!important}

/* ═══ Modals ═══ */
.modal-overlay{backdrop-filter:blur(8px);background:rgba(6,10,22,.6)}
.modal-card{background:var(--surface);border:1px solid var(--border);border-radius:18px;box-shadow:var(--shadow)}
.modal-close{width:30px;height:30px;border-radius:9px;display:grid;place-items:center;background:var(--surface2);border:1px solid var(--border);color:var(--text2);font-size:13px}
.modal-close:hover{background:var(--surface3);color:var(--text)}
.modal-title-center{color:var(--text);text-align:center;font-size:21px;font-weight:800;letter-spacing:-.01em;margin-bottom:4px;text-transform:none}
.modal-sub-center{text-align:center;color:var(--text2);font-size:13px;margin-bottom:18px}
.plan-card{background:var(--surface2);border:1px solid var(--border);border-radius:16px;transition:transform .15s var(--ease),border-color .15s}
.plan-card:hover{transform:translateY(-2px);border-color:var(--border-strong)}
.plan-card.featured{border-color:var(--primary);box-shadow:0 0 0 1px var(--primary),0 12px 34px rgba(56,189,248,.16)}
.plan-popular{background:var(--primary);color:#fff;border-radius:99px}
.plan-name{color:var(--text)}
.plan-price{color:var(--text)}
.plan-features li{display:flex;gap:8px;align-items:flex-start;line-height:1.35}
.plan-features li::before{content:'';flex:none;width:14px;height:14px;margin-top:1px;background:var(--success);-webkit-mask:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='m5 12 5 5 9-10' fill='none' stroke='black' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center/contain no-repeat;mask:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='m5 12 5 5 9-10' fill='none' stroke='black' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center/contain no-repeat}
.plan-features li.excluded{color:var(--text3)}
.plan-features li.excluded::before{background:var(--text3);-webkit-mask-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='m6 6 12 12M18 6 6 18' fill='none' stroke='black' stroke-width='3' stroke-linecap='round'/%3E%3C/svg%3E");mask-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='m6 6 12 12M18 6 6 18' fill='none' stroke='black' stroke-width='3' stroke-linecap='round'/%3E%3C/svg%3E")}
.plan-btn{border-radius:10px;font-weight:700;background:var(--primary);color:#fff;border:none}
.plan-btn.current{background:var(--surface3);color:var(--text2)}
.pressure-calc-card{border-radius:16px}

/* ═══ Toast ═══ */
.toast{display:none;align-items:center;gap:10px;background:var(--surface);color:var(--text);border:1px solid var(--border-strong);border-left:4px solid var(--primary);border-radius:12px;box-shadow:var(--shadow);padding:11px 16px;font-size:12.5px;font-weight:600;max-width:min(520px,92vw)}
.toast.show{display:flex}
.toast-success{border-left-color:var(--success)}
.toast-error{border-left-color:var(--danger)}
.toast-info{border-left-color:var(--primary)}

/* ═══ About ═══ */
.about-container{background:var(--bg)}
.about-hero{background:radial-gradient(1200px 400px at 50% -10%,rgba(56,189,248,.22),transparent 60%),radial-gradient(800px 320px at 80% 0,rgba(139,123,255,.18),transparent 60%),var(--bg2);border-bottom:1px solid var(--border)}
.about-hero h1{color:var(--text);font-size:38px;font-weight:800;letter-spacing:-.03em}
.about-tagline{color:var(--text2)}
.about-section h2{color:var(--text);letter-spacing:-.01em}
.about-section p,.about-section li{color:var(--text2);line-height:1.65}
.about-card{background:var(--surface);border:1px solid var(--border);border-radius:16px;transition:transform .18s var(--ease),border-color .18s,box-shadow .18s}
.about-card:hover{transform:translateY(-3px);border-color:var(--primary-dim);box-shadow:var(--shadow)}
.about-card-icon{width:40px;height:40px;border-radius:11px;display:grid;place-items:center;background:var(--primary-light);color:var(--primary);font-size:0;margin-bottom:12px}
.about-card-icon .ic{width:20px;height:20px;vertical-align:0}
.trial-callout,.trial-callout strong{color:var(--text)!important}
.trial-callout{background:var(--primary-light);border:1px solid color-mix(in srgb,var(--primary) 35%,transparent);border-radius:12px}

/* topography cards */
.topo-card{background:var(--surface);border:1px solid var(--border);border-radius:12px}
.topo-card-header:hover{background:var(--surface2)}

/* scrollbars */
::-webkit-scrollbar-thumb{background:var(--border-strong);border-radius:99px}

/* ═══ Responsive: narrow screens turn side panels into drawers ═══ */
.sw-panel-toggle{display:none}
@media(max-width:900px){
  .brand-tagline,.main-tab span,.save-indicator{display:none}
  .main-tab{padding:7px 10px}
  #btn-help-nav{display:none}
  .sw-panel-toggle{display:inline-flex;position:fixed;z-index:4500;bottom:14px;align-items:center;gap:6px;padding:9px 14px;border-radius:99px;background:var(--primary);color:#fff;border:none;font-weight:700;font-size:12px;box-shadow:var(--shadow)}
  .sw-panel-toggle.left{left:14px}
  .sw-panel-toggle.right{right:14px}
  .panel-left,.site-left-panel,.panel-right{transform:translateX(-105%);transition:transform .25s var(--ease);width:min(86vw,340px)!important;z-index:4400;box-shadow:var(--shadow)}
  .panel-right{transform:translateX(105%);left:auto;right:0}
  body.sw-left-open .panel-left,body.sw-left-open .site-left-panel{transform:none}
  body.sw-right-open .panel-right{transform:none}
  .model-center-stack{left:0!important;right:0!important}
  #map-container{left:0!important}
  .results-strip{flex-wrap:wrap}
}
@media(max-width:560px){
  .toolbar button span{display:none}
  .toolbar button{padding:7px 9px}
}

/* keyboard shortcuts sheet */
.sw-shortcuts{position:fixed;inset:0;z-index:9000;display:none;align-items:center;justify-content:center;background:rgba(6,10,22,.6);backdrop-filter:blur(6px)}
.sw-shortcuts.show{display:flex}
.sw-shortcuts-card{width:min(460px,92vw);background:var(--surface);border:1px solid var(--border);border-radius:16px;box-shadow:var(--shadow);padding:20px 22px}
.sw-shortcuts-card h2{font-size:16px;font-weight:800;margin-bottom:12px;color:var(--text)}
.sw-shortcuts-card dl{display:grid;grid-template-columns:auto 1fr;gap:8px 14px;align-items:center}
.sw-shortcuts-card dt{display:flex;gap:4px}
.sw-shortcuts-card dd{color:var(--text2)}
kbd{font-family:var(--mono);font-size:11px;background:var(--surface2);border:1px solid var(--border-strong);border-bottom-width:2px;border-radius:6px;padding:1px 7px;color:var(--text)}

/* in-page dialogs */
.sw-dialog{max-width:400px;width:calc(100% - 32px);padding:20px}
.sw-dialog h3{margin:0 0 8px;font-size:16px;color:var(--text)}
.sw-dialog p{margin:0 0 14px;font-size:13px;color:var(--text2);line-height:1.5}
.sw-dialog-input{width:100%;box-sizing:border-box;padding:9px 11px;margin:6px 0 14px;border-radius:8px;border:1px solid var(--border);background:var(--bg);color:var(--text);font:inherit}
.sw-dialog-input:focus{outline:2px solid var(--primary);outline-offset:1px}
.sw-dialog-actions{display:flex;gap:8px;justify-content:flex-end}
.sw-dialog-actions button{padding:8px 16px;border-radius:8px;font:inherit;font-size:13px;cursor:pointer;border:1px solid var(--border)}
.sw-btn-ghost{background:transparent;color:var(--text2)}
.sw-btn-primary{background:var(--primary);color:var(--bg);border-color:var(--primary)!important;font-weight:600}
.sw-btn-primary.danger{background:var(--danger);border-color:var(--danger)!important;color:#fff}

@media print{
  .top-nav,.structure-subtabs,.doc-toolbar,.sw-panel-toggle,.toast{display:none!important}
}