/* ============================================================
   EVERYTHING AC DIY — Design System
   Identity: technician's manifold gauge — copper, gauge-charcoal,
   duct steel, cooling blue, warning amber. Condensed stamped-plate
   display type over a clean readable body face.
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Oswald:wght@400;500;600;700&family=Source+Sans+3:wght@400;500;600;700&family=IBM+Plex+Mono:wght@500;600&display=swap');

:root{
  --ink:#12171B;
  --panel:#1B2228;
  --panel-2:#232C33;
  --panel-3:#2B353D;
  --copper:#C1793F;
  --copper-bright:#DD9257;
  --copper-deep:#8C5527;
  --steel:#8FA0AC;
  --steel-dim:#5E6E78;
  --cool:#4FA3D1;
  --amber:#F0A93B;
  --danger:#E2543D;
  --paper:#F3EFE6;
  --paper-2:#EAE4D6;
  --ink-on-paper:#1B2228;
  --line-dark:rgba(255,255,255,0.09);
  --line-light:rgba(27,34,40,0.12);
  --radius:10px;
  --radius-sm:6px;
  --shadow:0 20px 50px -20px rgba(0,0,0,0.55);
  --font-display:'Oswald',sans-serif;
  --font-body:'Source Sans 3',sans-serif;
  --font-mono:'IBM Plex Mono',monospace;
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--ink);
  color:var(--paper);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;}
a{color:inherit;}
h1,h2,h3,h4{
  font-family:var(--font-display);
  text-transform:uppercase;
  letter-spacing:0.01em;
  margin:0 0 .5em;
  line-height:1.08;
  font-weight:600;
}
p{margin:0 0 1em;}
.container{max-width:1180px;margin:0 auto;padding:0 24px;}
.mono{font-family:var(--font-mono);letter-spacing:.03em;}

@media (prefers-reduced-motion: reduce){
  *{animation-duration:.001ms !important;animation-iteration-count:1 !important;transition-duration:.001ms !important;scroll-behavior:auto !important;}
}

/* ---------- Focus & a11y ---------- */
a:focus-visible,button:focus-visible,input:focus-visible,textarea:focus-visible,select:focus-visible{
  outline:2px solid var(--amber);
  outline-offset:2px;
}
.skip-link{
  position:absolute;left:-999px;top:0;background:var(--amber);color:var(--ink);
  padding:10px 16px;z-index:200;font-family:var(--font-mono);font-size:.85rem;
}
.skip-link:focus{left:12px;top:12px;}

/* ---------- Eyebrow / labels ---------- */
.eyebrow{
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--copper-bright);
  display:flex;align-items:center;gap:10px;
  margin-bottom:14px;
}
.eyebrow::before{
  content:"";width:22px;height:1px;background:var(--copper);display:inline-block;
}

/* ---------- Header ---------- */
.site-header{
  position:sticky;top:0;z-index:100;
  background:rgba(18,23,27,0.92);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line-dark);
}
.site-header .bar{
  display:flex;align-items:center;justify-content:space-between;
  padding:16px 24px;
  max-width:1180px;margin:0 auto;
}
.brand{display:flex;align-items:center;gap:12px;text-decoration:none;}
.brand svg{width:34px;height:34px;flex-shrink:0;}
.brand-text{display:flex;flex-direction:column;line-height:1.1;}
.brand-text .wordmark{
  font-family:var(--font-display);font-weight:700;font-size:1.05rem;
  letter-spacing:.03em;color:var(--paper);text-transform:uppercase;
}
.brand-text .subline{
  font-family:var(--font-mono);font-size:.62rem;color:var(--steel);
  letter-spacing:.1em;text-transform:uppercase;
}
.nav{display:flex;align-items:center;gap:28px;}
.nav a{
  font-family:var(--font-mono);font-size:.78rem;text-transform:uppercase;
  letter-spacing:.06em;color:var(--steel);text-decoration:none;
  padding:6px 0;border-bottom:1px solid transparent;
  transition:color .15s ease,border-color .15s ease;
}
.nav a:hover,.nav a.active{color:var(--paper);border-color:var(--copper);}
.nav-toggle{display:none;background:none;border:1px solid var(--line-dark);color:var(--paper);width:40px;height:40px;border-radius:var(--radius-sm);}

.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  font-family:var(--font-mono);font-size:.78rem;text-transform:uppercase;letter-spacing:.08em;
  padding:13px 22px;border-radius:var(--radius-sm);border:1px solid transparent;
  cursor:pointer;text-decoration:none;transition:transform .15s ease,background .15s ease,border-color .15s ease;
  white-space:nowrap;
}
.btn:active{transform:translateY(1px);}
.btn-copper{background:var(--copper);color:#181008;border-color:var(--copper);font-weight:600;}
.btn-copper:hover{background:var(--copper-bright);}
.btn-ghost{background:transparent;color:var(--paper);border-color:var(--line-dark);}
.btn-ghost:hover{border-color:var(--copper);color:var(--copper-bright);}
.btn-block{width:100%;}
.btn[disabled]{opacity:.5;cursor:not-allowed;}

/* ---------- Hero ---------- */
.hero{
  padding:88px 0 64px;
  border-bottom:1px solid var(--line-dark);
  background:
    radial-gradient(700px 380px at 82% 10%, rgba(193,121,63,0.14), transparent 60%),
    var(--ink);
}
.hero-grid{
  display:grid;grid-template-columns:1.15fr .85fr;gap:56px;align-items:center;
}
.hero h1{font-size:clamp(2.5rem,4.6vw,3.85rem);color:var(--paper);}
.hero h1 span{color:var(--copper-bright);}
.hero .lede{font-size:1.1rem;color:var(--steel);max-width:46ch;}
.chip-row{display:flex;flex-wrap:wrap;gap:10px;margin:26px 0 30px;}
.chip{
  font-family:var(--font-mono);font-size:.78rem;letter-spacing:.03em;
  padding:9px 14px;border-radius:999px;border:1px solid var(--line-dark);
  background:var(--panel);color:var(--paper);cursor:pointer;
  transition:border-color .15s ease,background .15s ease;
}
.chip:hover{border-color:var(--copper);background:var(--panel-2);}
.chip .tag-warn{color:var(--amber);}
.hero-ctas{display:flex;gap:14px;flex-wrap:wrap;}

/* ---------- Gauge (signature element) ---------- */
.gauge-wrap{display:flex;flex-direction:column;align-items:center;gap:14px;}
.gauge{width:100%;max-width:340px;height:auto;}
.gauge-needle{transform-origin:170px 170px;animation:sweep 4.5s ease-in-out infinite;}
@keyframes sweep{
  0%{transform:rotate(-58deg);}
  45%{transform:rotate(46deg);}
  55%{transform:rotate(46deg);}
  100%{transform:rotate(-58deg);}
}
.gauge-caption{font-family:var(--font-mono);font-size:.72rem;color:var(--steel);letter-spacing:.12em;text-transform:uppercase;text-align:center;}

/* ---------- Trust strip ---------- */
.trust-strip{border-bottom:1px solid var(--line-dark);background:var(--panel);}
.trust-grid{
  display:grid;grid-template-columns:repeat(4,1fr);
  padding:26px 0;
}
.trust-item{
  padding:0 22px;border-left:1px solid var(--line-dark);
  font-family:var(--font-mono);font-size:.82rem;color:var(--steel);line-height:1.5;
}
.trust-item:first-child{border-left:none;}
.trust-item b{display:block;color:var(--paper);font-family:var(--font-display);text-transform:uppercase;font-size:1rem;letter-spacing:.02em;margin-bottom:4px;}

/* ---------- Section shell ---------- */
.section{padding:84px 0;}
.section-head{max-width:640px;margin-bottom:44px;}
.section-head h2{font-size:clamp(1.9rem,3vw,2.6rem);color:var(--paper);}
.section-head p{color:var(--steel);font-size:1.05rem;}
.on-paper{background:var(--paper);color:var(--ink-on-paper);}
.on-paper .section-head h2{color:var(--ink-on-paper);}
.on-paper .section-head p{color:#4B5761;}

/* ---------- Diagnostic tool panel ---------- */
.diagnose-panel{
  border:1px solid var(--line-dark);
  border-radius:var(--radius);
  background:var(--panel);
  box-shadow:var(--shadow);
  overflow:hidden;
}
.diagnose-head{
  display:flex;align-items:center;justify-content:space-between;
  padding:16px 20px;border-bottom:1px solid var(--line-dark);
  background:var(--panel-2);
}
.diagnose-head .label{font-family:var(--font-mono);font-size:.78rem;letter-spacing:.08em;text-transform:uppercase;color:var(--steel);display:flex;align-items:center;gap:10px;}
.dot{width:8px;height:8px;border-radius:50%;background:var(--cool);box-shadow:0 0 0 3px rgba(79,163,209,.18);}
.dot.thinking{background:var(--amber);box-shadow:0 0 0 3px rgba(240,169,59,.2);animation:pulse 1s infinite;}
@keyframes pulse{0%,100%{opacity:1;}50%{opacity:.35;}}
.reset-btn{background:none;border:none;color:var(--steel);font-family:var(--font-mono);font-size:.72rem;text-transform:uppercase;letter-spacing:.06em;cursor:pointer;}
.reset-btn:hover{color:var(--copper-bright);}

.chat-log{
  padding:22px 20px;height:460px;overflow-y:auto;
  display:flex;flex-direction:column;gap:16px;
  background:
    linear-gradient(var(--panel),var(--panel));
}
.msg{max-width:82%;display:flex;gap:10px;}
.msg .avatar{
  width:30px;height:30px;border-radius:50%;flex-shrink:0;
  display:flex;align-items:center;justify-content:center;
  background:var(--panel-3);border:1px solid var(--line-dark);
}
.msg .avatar svg{width:16px;height:16px;color:var(--copper-bright);}
.msg .bubble{
  padding:13px 16px;border-radius:var(--radius-sm);
  font-size:.96rem;line-height:1.55;white-space:pre-wrap;
}
.msg.user{align-self:flex-end;flex-direction:row-reverse;}
.msg.user .bubble{background:var(--copper);color:#181008;border-top-right-radius:2px;}
.msg.ai .bubble{background:var(--panel-2);color:var(--paper);border:1px solid var(--line-dark);border-top-left-radius:2px;}
.msg.ai .bubble h4{font-size:.85rem;margin:0 0 6px;color:var(--copper-bright);}
.msg.system .bubble{background:transparent;border:1px dashed var(--line-dark);color:var(--steel);font-family:var(--font-mono);font-size:.78rem;}
.msg .bubble ol,.msg .bubble ul{margin:8px 0 0;padding-left:20px;}
.msg .bubble a{color:var(--cool);}

.diagnose-form{
  display:flex;gap:10px;padding:16px 20px;border-top:1px solid var(--line-dark);background:var(--panel-2);
}
.diagnose-form textarea{
  flex:1;resize:none;background:var(--ink);border:1px solid var(--line-dark);
  border-radius:var(--radius-sm);color:var(--paper);padding:12px 14px;font-family:var(--font-body);
  font-size:.95rem;min-height:48px;max-height:130px;
}
.diagnose-form textarea:focus{border-color:var(--copper);outline:none;}
.diagnose-hint{padding:10px 20px 18px;font-family:var(--font-mono);font-size:.7rem;color:var(--steel-dim);letter-spacing:.02em;}

/* Quick intake fields shown before first message */
.intake{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;padding:0 20px 18px;}
.intake select{
  background:var(--ink);border:1px solid var(--line-dark);color:var(--paper);
  padding:10px 12px;border-radius:var(--radius-sm);font-family:var(--font-mono);font-size:.78rem;
}

/* ---------- How it works ---------- */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:28px;}
.step{border-top:2px solid var(--copper);padding-top:16px;}
.step .num{font-family:var(--font-mono);color:var(--copper-bright);font-size:.8rem;letter-spacing:.1em;}
.step h3{color:var(--paper);font-size:1.2rem;margin-top:6px;}
.step p{color:var(--steel);}

/* ---------- Cards ---------- */
.card-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;}
.card{
  background:var(--panel-2);border:1px solid var(--line-dark);border-radius:var(--radius);
  padding:24px;transition:border-color .15s ease,transform .15s ease;text-decoration:none;color:var(--paper);
  display:flex;flex-direction:column;gap:10px;
}
.card:hover{border-color:var(--copper);transform:translateY(-3px);}
.card .icon{width:34px;height:34px;color:var(--copper-bright);}
.card h3{font-size:1.1rem;margin-bottom:2px;}
.card p{color:var(--steel);font-size:.92rem;margin-bottom:0;}
.card .meta{font-family:var(--font-mono);font-size:.7rem;color:var(--steel-dim);letter-spacing:.06em;text-transform:uppercase;margin-top:auto;}

.on-paper .card{background:#fff;border-color:var(--line-light);color:var(--ink-on-paper);}
.on-paper .card p{color:#57626C;}
.on-paper .card:hover{border-color:var(--copper);}

/* ---------- Safety band ---------- */
.safety-band{background:var(--panel);border-top:1px solid var(--line-dark);border-bottom:1px solid var(--line-dark);}
.safety-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:0;}
.safety-item{
  padding:34px 30px;border-left:1px solid var(--line-dark);
}
.safety-item:first-child{border-left:none;}
.safety-item .flag{font-family:var(--font-mono);font-size:.7rem;letter-spacing:.1em;text-transform:uppercase;color:var(--danger);display:flex;align-items:center;gap:8px;margin-bottom:10px;}
.safety-item .flag svg{width:14px;height:14px;}
.safety-item h3{font-size:1.05rem;color:var(--paper);}
.safety-item p{color:var(--steel);font-size:.92rem;margin-bottom:0;}

/* ---------- Footer ---------- */
.site-footer{background:var(--ink);border-top:1px solid var(--line-dark);padding:56px 0 28px;}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:36px;margin-bottom:40px;}
.footer-brand p{color:var(--steel);font-size:.88rem;max-width:34ch;}
.footer-col h4{font-family:var(--font-mono);font-size:.72rem;letter-spacing:.1em;text-transform:uppercase;color:var(--steel-dim);margin-bottom:14px;}
.footer-col ul{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:10px;}
.footer-col a{color:var(--steel);text-decoration:none;font-size:.9rem;}
.footer-col a:hover{color:var(--copper-bright);}
.footer-legal{
  border-top:1px solid var(--line-dark);padding-top:22px;
  display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap;
  font-family:var(--font-mono);font-size:.72rem;color:var(--steel-dim);
}
.footer-disclaimer{max-width:820px;color:var(--steel-dim);font-size:.78rem;line-height:1.6;margin-bottom:22px;}

/* ---------- Generic content page shell ---------- */
.page-hero{padding:64px 0 40px;border-bottom:1px solid var(--line-dark);}
.page-hero h1{font-size:clamp(2.1rem,4vw,3rem);color:var(--paper);}
.page-hero p{color:var(--steel);max-width:60ch;font-size:1.05rem;}
.breadcrumb{font-family:var(--font-mono);font-size:.72rem;color:var(--steel-dim);letter-spacing:.06em;text-transform:uppercase;margin-bottom:18px;}
.breadcrumb a{color:var(--steel);text-decoration:none;}
.breadcrumb a:hover{color:var(--copper-bright);}

/* Library / accordion */
.filter-row{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:30px;}
.filter-chip{
  font-family:var(--font-mono);font-size:.76rem;padding:8px 14px;border-radius:999px;
  border:1px solid var(--line-dark);background:var(--panel);color:var(--steel);cursor:pointer;
}
.filter-chip.active,.filter-chip:hover{border-color:var(--copper);color:var(--paper);}
.accordion{border:1px solid var(--line-dark);border-radius:var(--radius);overflow:hidden;background:var(--panel-2);}
.acc-item + .acc-item{border-top:1px solid var(--line-dark);}
.acc-trigger{
  width:100%;text-align:left;background:none;border:none;color:var(--paper);
  padding:20px 22px;display:flex;justify-content:space-between;align-items:center;gap:16px;
  cursor:pointer;font-family:var(--font-body);font-size:1rem;font-weight:600;
}
.acc-trigger .badges{display:flex;gap:8px;flex-wrap:wrap;font-family:var(--font-mono);font-size:.68rem;text-transform:uppercase;letter-spacing:.04em;}
.badge{padding:3px 8px;border-radius:4px;border:1px solid var(--line-dark);color:var(--steel);}
.badge.diy{color:var(--cool);border-color:rgba(79,163,209,.4);}
.badge.pro{color:var(--danger);border-color:rgba(226,84,61,.4);}
.acc-trigger .chevron{transition:transform .2s ease;color:var(--copper);flex-shrink:0;}
.acc-item.open .chevron{transform:rotate(180deg);}
.acc-panel{max-height:0;overflow:hidden;transition:max-height .25s ease;background:var(--ink);}
.acc-item.open .acc-panel{max-height:1400px;}
.acc-inner{padding:4px 22px 26px;color:var(--steel);}
.acc-inner h5{color:var(--copper-bright);font-family:var(--font-mono);font-size:.75rem;text-transform:uppercase;letter-spacing:.08em;margin:16px 0 8px;}
.acc-inner ol,.acc-inner ul{padding-left:20px;margin:0;}
.acc-inner li{margin-bottom:6px;}

/* Glossary */
.glossary-grid{columns:2;column-gap:40px;}
.gloss-item{break-inside:avoid;margin-bottom:22px;}
.gloss-item dt{font-family:var(--font-mono);color:var(--copper-bright);font-size:.95rem;margin-bottom:4px;}
.gloss-item dd{margin:0;color:var(--steel);font-size:.92rem;}

/* Search box */
.search-box{position:relative;margin-bottom:30px;}
.search-box input{
  width:100%;background:var(--panel-2);border:1px solid var(--line-dark);border-radius:var(--radius-sm);
  color:var(--paper);padding:14px 16px 14px 44px;font-family:var(--font-body);font-size:.95rem;
}
.search-box svg{position:absolute;left:14px;top:50%;transform:translateY(-50%);width:18px;height:18px;color:var(--steel);}

/* Contact / about */
.two-col{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:start;}
.fact-list{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:16px;}
.fact-list li{display:flex;gap:14px;border-top:1px solid var(--line-dark);padding-top:14px;font-size:.95rem;color:var(--steel);}
.fact-list li b{color:var(--paper);font-family:var(--font-mono);min-width:120px;display:inline-block;font-size:.78rem;text-transform:uppercase;letter-spacing:.05em;}

.callout{border:1px solid var(--line-dark);border-left:3px solid var(--amber);background:var(--panel-2);padding:20px 22px;border-radius:0 var(--radius-sm) var(--radius-sm) 0;}
.callout.danger{border-left-color:var(--danger);}
.callout h4{font-family:var(--font-mono);text-transform:uppercase;font-size:.8rem;letter-spacing:.06em;color:var(--amber);margin-bottom:8px;}
.callout.danger h4{color:var(--danger);}
.callout p{color:var(--steel);margin-bottom:0;font-size:.92rem;}

/* ---------- Pro Tools: toolbar, photo upload, reference images ---------- */
.tool-row{
  display:flex;align-items:center;gap:8px;flex-wrap:wrap;
  padding:12px 20px;border-top:1px solid var(--line-dark);background:var(--panel-2);
}
.tool-btn{
  display:inline-flex;align-items:center;gap:6px;
  background:var(--ink);border:1px solid var(--line-dark);color:var(--steel);
  font-family:var(--font-mono);font-size:.72rem;letter-spacing:.03em;text-transform:uppercase;
  padding:8px 12px;border-radius:999px;cursor:pointer;transition:border-color .15s ease,color .15s ease;
}
.tool-btn:hover{border-color:var(--copper);color:var(--paper);}
.tool-btn svg{width:14px;height:14px;}
.pro-badge{
  font-family:var(--font-mono);font-size:.6rem;letter-spacing:.08em;text-transform:uppercase;
  background:linear-gradient(135deg,var(--copper),var(--copper-deep));color:#181008;
  padding:2px 6px;border-radius:4px;margin-left:2px;font-weight:600;
}

.image-preview-strip{display:flex;gap:10px;padding:0 20px 12px;flex-wrap:wrap;}
.image-preview{
  position:relative;width:64px;height:64px;border-radius:var(--radius-sm);overflow:hidden;
  border:1px solid var(--line-dark);
}
.image-preview img{width:100%;height:100%;object-fit:cover;}
.image-preview button{
  position:absolute;top:2px;right:2px;width:18px;height:18px;border-radius:50%;
  background:rgba(18,23,27,.85);border:none;color:var(--paper);font-size:.7rem;line-height:1;cursor:pointer;
}

.refimg-panel{
  display:flex;gap:8px;padding:0 20px 14px;flex-wrap:wrap;align-items:center;
}
.refimg-panel input[type="text"]{
  flex:1;min-width:180px;background:var(--ink);border:1px solid var(--line-dark);border-radius:var(--radius-sm);
  color:var(--paper);padding:10px 12px;font-family:var(--font-body);font-size:.88rem;
}

.msg .bubble img.generated-ref,.msg .bubble img.uploaded-photo{
  max-width:100%;border-radius:var(--radius-sm);margin-top:8px;display:block;border:1px solid var(--line-dark);
}
.img-caption{font-family:var(--font-mono);font-size:.68rem;color:var(--steel);margin-top:6px;display:block;}

.report-actions{
  display:flex;gap:10px;flex-wrap:wrap;padding:0 20px 16px;
}

/* History drawer */
.drawer-overlay{
  position:fixed;inset:0;background:rgba(0,0,0,.5);z-index:300;display:none;
}
.drawer-overlay.open{display:block;}
.drawer{
  position:fixed;top:0;right:0;bottom:0;width:min(380px,92vw);background:var(--panel);
  border-left:1px solid var(--line-dark);z-index:301;transform:translateX(100%);
  transition:transform .25s ease;display:flex;flex-direction:column;
}
.drawer.open{transform:translateX(0);}
.drawer-head{display:flex;justify-content:space-between;align-items:center;padding:18px 20px;border-bottom:1px solid var(--line-dark);}
.drawer-head h3{margin:0;font-size:1.05rem;}
.drawer-close{background:none;border:none;color:var(--steel);font-size:1.3rem;cursor:pointer;line-height:1;}
.drawer-body{flex:1;overflow-y:auto;padding:14px 20px;}
.history-item{
  border:1px solid var(--line-dark);border-radius:var(--radius-sm);padding:14px;margin-bottom:12px;
  cursor:pointer;transition:border-color .15s ease;
}
.history-item:hover{border-color:var(--copper);}
.history-item .h-date{font-family:var(--font-mono);font-size:.68rem;color:var(--steel-dim);text-transform:uppercase;}
.history-item .h-preview{font-size:.86rem;color:var(--paper);margin:6px 0 8px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;}
.history-item .h-actions{display:flex;gap:10px;}
.history-item .h-actions button{background:none;border:none;color:var(--steel);font-family:var(--font-mono);font-size:.68rem;text-transform:uppercase;cursor:pointer;}
.history-item .h-actions button:hover{color:var(--copper-bright);}
.history-empty{color:var(--steel-dim);font-family:var(--font-mono);font-size:.82rem;text-align:center;padding:40px 10px;}

/* Install button */
.install-btn{display:none;align-items:center;gap:6px;}
.install-btn.visible{display:inline-flex;}
.ios-tip{
  position:fixed;left:16px;right:16px;bottom:16px;z-index:250;
  background:var(--panel-2);border:1px solid var(--copper);border-radius:var(--radius);
  padding:14px 16px;font-size:.86rem;color:var(--paper);display:none;
  box-shadow:var(--shadow);
}
.ios-tip.visible{display:flex;align-items:center;gap:12px;}
.ios-tip button{background:none;border:none;color:var(--steel);font-size:1.1rem;cursor:pointer;margin-left:auto;}

/* Library guide action row (injected by JS) */
.guide-actions{display:flex;gap:8px;margin-top:14px;flex-wrap:wrap;}
.guide-actions button{
  font-family:var(--font-mono);font-size:.68rem;text-transform:uppercase;letter-spacing:.04em;
  background:var(--panel-3);border:1px solid var(--line-dark);color:var(--steel);
  padding:6px 10px;border-radius:999px;cursor:pointer;
}
.guide-actions button:hover{border-color:var(--copper);color:var(--paper);}

@media print{
  .site-header,.site-footer,.diagnose-form,.tool-row,.intake,.hero-ctas,.chip-row,
  .drawer,.drawer-overlay,.install-btn,.ios-tip,.reset-btn,.guide-actions,.filter-row,.search-box{
    display:none !important;
  }
}

/* ---------- Responsive ---------- */
@media (max-width:960px){
  .hero-grid{grid-template-columns:1fr;}
  .gauge-wrap{order:-1;max-width:260px;margin:0 auto;}
  .trust-grid{grid-template-columns:repeat(2,1fr);row-gap:20px;}
  .trust-item:nth-child(3){border-left:none;}
  .steps,.card-grid,.safety-grid{grid-template-columns:1fr;}
  .safety-item{border-left:none;border-top:1px solid var(--line-dark);}
  .safety-item:first-child{border-top:none;}
  .footer-grid{grid-template-columns:1fr 1fr;}
  .two-col{grid-template-columns:1fr;}
  .glossary-grid{columns:1;}
  .intake{grid-template-columns:1fr;}
}
@media (max-width:720px){
  .nav{position:fixed;inset:64px 0 0 0;background:var(--ink);flex-direction:column;align-items:flex-start;padding:24px;gap:6px;display:none;}
  .nav.open{display:flex;}
  .nav a{width:100%;padding:14px 0;border-bottom:1px solid var(--line-dark);}
  .nav-toggle{display:block;}
  .header-cta{display:none;}
  .footer-grid{grid-template-columns:1fr;}
  .chat-log{height:400px;}
}