/* Corstrum site design system (2026-10-18). Matches the estimate PDF: navy header, teal rule. */
:root{
  --ink:#0f1b2b;--ink-2:#2b3a4d;--muted:#5b6b7e;--line:#e3e8ef;--soft:#f5f7fa;--bg:#ffffff;
  --navy:#1f3a5f;--navy-2:#16304f;--teal:#1a9b8f;--teal-soft:#e6f5f3;--warn:#b45309;
  --on-navy:#ffffff;--shadow:0 1px 2px rgba(15,27,43,.06),0 8px 24px rgba(15,27,43,.08);
  --radius:14px;--max:1120px;--logo-body:#1f3a5f;--mono:"JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,monospace;--grid:rgba(31,58,95,.07);
}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){
  --ink:#e9eef5;--ink-2:#c8d3e0;--muted:#97a8bc;--line:#243246;--soft:#121c29;--bg:#0b131d;
  --navy:#7fa7d6;--navy-2:#a9c4e6;--teal:#3cc2b4;--teal-soft:#10302d;--on-navy:#0b131d;--grid:rgba(127,167,214,.08);--logo-body:#ffffff;
  --shadow:0 1px 2px rgba(0,0,0,.4),0 8px 24px rgba(0,0,0,.35)}}
:root[data-theme="dark"]{--logo-body:#ffffff;--ink:#e9eef5;--ink-2:#c8d3e0;--muted:#97a8bc;--line:#243246;--soft:#121c29;--bg:#0b131d;
  --navy:#7fa7d6;--navy-2:#a9c4e6;--teal:#3cc2b4;--teal-soft:#10302d;--on-navy:#0b131d}

*{box-sizing:border-box}html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.6 "Inter",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  font-feature-settings:"cv11","ss01";-webkit-font-smoothing:antialiased}
a{color:var(--navy)}img{max-width:100%;height:auto;display:block}
html,body{overflow-x:clip}.hero{overflow-x:clip}
.wrap{max-width:var(--max);margin:0 auto;padding:0 16px}
@media (min-width:720px){.wrap{padding:0 28px}}
h1,h2,h3{letter-spacing:-.022em;line-height:1.15;margin:0}
h1{font-size:clamp(34px,5vw,54px);font-weight:750}
h2{font-size:clamp(26px,3.4vw,38px);font-weight:720}
h3{font-size:19px;font-weight:650}
p{margin:0 0 14px}.muted{color:var(--muted)}.small{font-size:14px}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:13px;font-weight:650;letter-spacing:.06em;text-transform:uppercase;color:var(--teal)}
.eyebrow::before{content:"";width:18px;height:2px;background:var(--teal);border-radius:2px}

/* header */
.site-header{position:sticky;top:0;z-index:20;background:color-mix(in srgb,var(--bg) 88%,transparent);backdrop-filter:saturate(1.4) blur(10px);border-bottom:1px solid var(--line)}
.site-header nav{display:flex;align-items:center;justify-content:space-between;height:64px;gap:12px}
.logo{display:flex;align-items:center;gap:10px;font-weight:800;font-size:20px;letter-spacing:-.03em;color:var(--ink);text-decoration:none}
.logo-svg{height:26px;width:auto;flex:none;color:var(--ink);display:block}
.site-footer .logo-svg{height:24px}
.nav-links{display:flex;align-items:center;gap:22px}
.nav-links a{color:var(--ink-2);text-decoration:none;font-size:15px;font-weight:500}
.nav-links a:hover{color:var(--navy)}
.nav-links a.btn{color:var(--on-navy)}.nav-links a.btn:hover{color:var(--on-navy)}
@media (max-width:820px){.nav-links a.hide-sm{display:none}}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:46px;padding:0 20px;border-radius:10px;
  background:var(--navy);color:var(--on-navy);font-weight:650;font-size:16px;text-decoration:none;border:0;cursor:pointer;
  transition:transform .15s ease,box-shadow .15s ease,background .15s}
.btn:hover{transform:translateY(-1px);box-shadow:var(--shadow)}
.btn.sm{min-height:38px;padding:0 14px;font-size:14px}
.btn.ghost{background:transparent;color:var(--navy);box-shadow:inset 0 0 0 1.5px var(--navy)}
.btn.teal{background:var(--teal);color:#fff}
.btn-row{display:flex;flex-wrap:wrap;gap:12px;margin-top:26px}

/* hero */
.hero{padding-top:64px;padding-bottom:40px;position:relative}
@media (max-width:719px){.hero{padding-top:36px}.doc-stack .doc.back{width:78%}.stat{padding:16px}.stat b{font-size:24px}}
.hero-grid{display:grid;gap:44px;align-items:center}.hero-grid>*{min-width:0}
@media (min-width:960px){.hero-grid{grid-template-columns:1fr 1.12fr}}
.hero .lead{font-size:clamp(17px,1.9vw,20px);color:var(--ink-2);max-width:560px;margin-top:20px}
.checks{list-style:none;padding:0;margin:22px 0 0;display:grid;gap:10px}
.checks li{display:flex;gap:10px;align-items:flex-start;color:var(--ink-2)}
.checks svg{flex:none;width:20px;height:20px;margin-top:2px;color:var(--teal)}
.doc-stack{position:relative;min-height:320px}
.doc{border-radius:12px;overflow:hidden;box-shadow:var(--shadow),0 0 0 1px var(--line);background:#fff}
.doc-stack .doc.back{position:absolute;width:86%;right:0;top:0;transform:rotate(2.2deg);opacity:.95}
.doc-stack .doc.front{position:relative;width:92%;margin-top:56px;transform:rotate(-1.4deg)}
.doc-badge{position:absolute;left:-6px;bottom:18px;z-index:2;background:var(--bg);border:1px solid var(--line);border-radius:12px;box-shadow:var(--shadow);
  padding:12px 14px;display:flex;gap:10px;align-items:center;font-size:14px}
.doc-badge b{display:block;font-size:18px}
@media (max-width:959px){.doc-stack{max-width:560px}}

/* hero visual: real takeoff on a real sheet */
.hero-shell{position:relative;isolation:isolate}
.hero-bg{position:absolute;inset:0;z-index:-1;pointer-events:none;
  background-image:linear-gradient(var(--grid) 1px,transparent 1px),linear-gradient(90deg,var(--grid) 1px,transparent 1px);
  background-size:28px 28px;-webkit-mask-image:radial-gradient(ellipse 70% 60% at 72% 35%,#000 25%,transparent 75%);
  mask-image:radial-gradient(ellipse 70% 60% at 72% 35%,#000 25%,transparent 75%)}
.hero-visual{position:relative;padding:0 0 40px 0}
@media (min-width:960px){.hero-visual{padding:0 0 48px 36px}}
.sheet{border-radius:16px;overflow:hidden;background:#fff;box-shadow:0 0 0 1px var(--line),0 2px 4px rgba(15,27,43,.05),0 24px 60px -12px rgba(15,27,43,.28)}
.sheet-bar{display:flex;align-items:center;gap:12px;padding:10px 14px;background:#1f3a5f;color:#fff;font-size:13px;font-weight:600}
.sheet-bar .dots{display:flex;gap:6px}.sheet-bar .dots i{width:9px;height:9px;border-radius:50%;background:rgba(255,255,255,.35)}
.sheet-bar .sheet-title{flex:1;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;opacity:.92}
.sheet-bar .chip{display:inline-flex;align-items:center;gap:5px;background:#1a9b8f;border-radius:999px;padding:3px 10px;font-size:12px;white-space:nowrap}
.sheet-bar .chip svg{width:13px;height:13px}
.sheet-img{height:clamp(320px,42vw,520px);overflow:hidden;border-top:3px solid #1a9b8f}
.img-wrap{position:relative}.img-wrap img{width:100%;height:auto}
.pin{position:absolute;display:flex;align-items:flex-start;gap:6px;transform:translate(-7px,-7px);pointer-events:none}
.pin i{flex:none;width:14px;height:14px;border-radius:50%;background:#1a9b8f;box-shadow:0 0 0 4px rgba(26,155,143,.25),0 0 0 1px #fff}
.pin-label{background:#0f1b2b;color:#fff;font-size:11.5px;font-weight:600;line-height:1.35;padding:6px 9px;border-radius:8px;max-width:210px;box-shadow:0 6px 16px rgba(15,27,43,.25)}
@media (max-width:719px){.pin-label{max-width:150px;font-size:10.5px}}
.lines-card{position:relative;margin:-56px 12px 0;background:var(--bg);border:1px solid var(--line);border-radius:14px;box-shadow:var(--shadow);padding:14px 16px;font-size:14px}
@media (min-width:960px){.lines-card{position:absolute;left:0;bottom:0;width:320px;margin:0}}
.lc-head{display:flex;justify-content:space-between;align-items:center;font-weight:700;margin-bottom:8px}
.pass{font-size:11px;font-weight:700;letter-spacing:.04em;text-transform:uppercase;color:var(--teal);background:var(--teal-soft);border-radius:6px;padding:3px 7px}
.lc-row{display:grid;grid-template-columns:44px 1fr auto;gap:8px;padding:6px 0;border-top:1px solid var(--line);color:var(--ink-2)}
.lc-row .id{color:var(--muted);font-family:var(--mono)}.lc-row b{font-family:var(--mono);font-weight:600;color:var(--ink)}
.lc-total{display:flex;justify-content:space-between;margin-top:6px;padding-top:10px;border-top:2px solid var(--ink);font-weight:600}
.lc-total b{font-size:16px;font-family:var(--mono)}

/* sections */
section{padding:72px 0;border-top:1px solid var(--line)}
section.tint{background:var(--soft)}
.section-head{max-width:720px;margin-bottom:36px}.section-head p{color:var(--muted);font-size:18px;margin-top:14px}
.grid{display:grid;gap:18px}
@media (min-width:720px){.grid.c2{grid-template-columns:repeat(2,1fr)}.grid.c3{grid-template-columns:repeat(3,1fr)}.grid.c4{grid-template-columns:repeat(4,1fr)}}
.card{background:var(--bg);border:1px solid var(--line);border-radius:var(--radius);padding:24px}
.card p{color:var(--muted);margin:8px 0 0}
.icon{width:42px;height:42px;border-radius:10px;display:grid;place-items:center;background:var(--teal-soft);color:var(--teal);margin-bottom:14px}
.icon svg{width:22px;height:22px}

/* stat strip */
.stats{display:grid;grid-template-columns:1fr 1fr;gap:1px;background:var(--line);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;margin-top:48px}
@media (min-width:720px){.stats{grid-template-columns:repeat(4,1fr)}}
.stat{background:var(--bg);padding:20px 22px}
.stat b{display:block;font-size:30px;font-weight:750;letter-spacing:-.03em;color:var(--ink)}
.stat span{display:block;font-size:14px;color:var(--muted);margin-top:4px}

/* steps */
.steps{counter-reset:s;display:grid;gap:18px}
@media (min-width:880px){.steps{grid-template-columns:repeat(3,1fr)}}
.step{position:relative;padding:24px;border-radius:var(--radius);border:1px solid var(--line);background:var(--bg)}
.step::before{counter-increment:s;content:counter(s);display:grid;place-items:center;width:34px;height:34px;border-radius:50%;
  background:var(--navy);color:var(--on-navy);font-weight:700;margin-bottom:14px}

/* deliverable gallery */
.tabs{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:18px}
.tab{border:1px solid var(--line);background:var(--bg);color:var(--ink-2);border-radius:999px;padding:8px 14px;font:inherit;font-size:14px;font-weight:600;cursor:pointer}
.tab[aria-selected="true"]{background:var(--navy);color:var(--on-navy);border-color:var(--navy)}
.shot{display:none}.shot.on{display:block}
.shot figcaption{color:var(--muted);font-size:14px;margin-top:12px}

/* compare table */
.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:var(--radius)}
table{width:100%;border-collapse:collapse;font-size:15px;min-width:640px}
th,td{text-align:left;padding:14px 16px;border-bottom:1px solid var(--line);vertical-align:top}
thead th{background:var(--soft);font-size:13px;text-transform:uppercase;letter-spacing:.05em;color:var(--muted)}
tbody tr:last-child td{border-bottom:0}
td.us,th.us{background:var(--teal-soft)}
.yes{color:var(--teal);font-weight:650}.no{color:var(--muted)}

/* pricing */
.price-card{display:flex;flex-direction:column}
.price-card .price{font-size:34px;font-weight:760;letter-spacing:-.03em;margin:10px 0 2px}
.price-card .per{color:var(--muted);font-size:14px}
.price-card ul{padding-left:0;list-style:none;margin:18px 0 22px;display:grid;gap:8px;color:var(--ink-2)}
.price-card ul li::before{content:"✓";color:var(--teal);font-weight:700;margin-right:8px}
.price-card .btn{margin-top:auto}
.price-card.featured{border:2px solid var(--navy);box-shadow:var(--shadow)}
.tag{display:inline-block;font-size:12px;font-weight:700;letter-spacing:.05em;text-transform:uppercase;background:var(--teal-soft);color:var(--teal);padding:4px 8px;border-radius:6px}

/* faq */
details{border-bottom:1px solid var(--line);padding:18px 0}
details summary{cursor:pointer;font-weight:650;font-size:17px;list-style:none;display:flex;justify-content:space-between;gap:16px}
details summary::-webkit-details-marker{display:none}
details summary::after{content:"+";color:var(--muted);font-weight:400;font-size:22px;line-height:1}
details[open] summary::after{content:"–"}
details p{color:var(--ink-2);margin:12px 0 0}

/* cta band */
.cta-band{background:var(--navy);color:var(--on-navy);border-radius:20px;padding:44px 32px;display:grid;gap:20px;align-items:center}
@media (min-width:880px){.cta-band{grid-template-columns:1.4fr auto;padding:52px 56px}}
.cta-band h2{color:var(--on-navy)}.cta-band p{opacity:.85;margin:10px 0 0}
.cta-band .btn{background:var(--teal);color:#fff}

/* forms */
label{display:block;font-weight:600;font-size:14px;margin:16px 0 6px}
input,select,textarea{width:100%;padding:12px 14px;border:1px solid var(--line);border-radius:10px;background:var(--bg);color:var(--ink);font:inherit}
input:focus,select:focus,textarea:focus{outline:2px solid var(--teal);outline-offset:1px;border-color:transparent}
.form-card{max-width:640px}

.checks.x svg{color:var(--muted)}
details.more{border:0;padding:6px 0 0}details.more summary{font-size:14px;font-weight:600;color:var(--navy)}
details.more summary::after{font-size:18px}
.hp{position:absolute;left:-9999px;width:1px;height:1px;overflow:hidden}
.form-msg{margin:12px 0 0;font-size:14px;min-height:1px}.form-msg.err{color:#b42318}
.btn[disabled]{opacity:.7;cursor:wait;transform:none}

.fineprint{margin-top:16px;font-size:14px;color:var(--muted);max-width:520px}
.scroll-hint{display:none;font-size:13px;color:var(--muted);margin:0 0 8px}
@media (max-width:719px){.scroll-hint{display:block}
  .table-wrap.fade{-webkit-mask-image:linear-gradient(90deg,#000 85%,transparent);mask-image:linear-gradient(90deg,#000 85%,transparent)}}

.stat b,.price,td,.lc-row,.lc-total{font-variant-numeric:tabular-nums}
td.us,th.us{box-shadow:inset 2px 0 0 var(--teal),inset -2px 0 0 var(--teal)}
thead th.us{color:var(--teal);box-shadow:inset 2px 0 0 var(--teal),inset -2px 0 0 var(--teal),inset 0 2px 0 var(--teal)}
tbody tr:last-child td.us{box-shadow:inset 2px 0 0 var(--teal),inset -2px 0 0 var(--teal),inset 0 -2px 0 var(--teal)}
.yes::before{content:"✓ ";font-weight:800}
.dash{color:#b42318;font-weight:700;margin-right:6px;opacity:.7}

.nowrap{white-space:nowrap}

/* footer */
.site-footer{border-top:1px solid var(--line);padding:40px 0 56px;color:var(--muted);font-size:14px}
.site-footer .cols{display:grid;gap:24px}
@media (min-width:720px){.site-footer .cols{grid-template-columns:2fr 1fr 1fr}}
.site-footer a{color:var(--ink-2);text-decoration:none}.site-footer a:hover{color:var(--navy)}
.site-footer ul{list-style:none;padding:0;margin:8px 0 0;display:grid;gap:6px}

/* content pages (proof, weekly) */
.page-head{padding-top:56px;padding-bottom:24px}.page-head .lead{color:var(--ink-2);font-size:19px;max-width:720px;margin-top:16px}
.content{padding-bottom:64px}
.content table{min-width:560px}
.note{color:var(--muted);font-size:14px}

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