/* ==========================================================================
   CALCORA — Design System
   Graphite + brass instrument aesthetic. Serif display (Fraunces) for voice,
   monospace (IBM Plex Mono) for every computed number, Inter for body copy.
   ========================================================================== */

:root{
  /* Color */
  --ink:        #0e1013;
  --ink-soft:   #14171b;
  --surface:    #171a1f;
  --surface-2:  #1e2229;
  --line:       rgba(245,244,240,0.09);
  --line-strong:rgba(245,244,240,0.16);
  --text:       #f5f4f0;
  --text-dim:   #a7acb5;
  --text-faint: #6b7078;
  --brass:      #d9a44a;
  --brass-hi:   #eec37a;
  --brass-dim:  #8a6a30;
  --mint:       #5fd9c4;
  --mint-dim:   #3a9c8c;
  --danger:     #e4685d;

  /* Type */
  --f-display: 'Fraunces', serif;
  --f-mono:    'IBM Plex Mono', monospace;
  --f-body:    'Inter', sans-serif;

  /* Layout */
  --max: 1240px;
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 26px;
  --shadow-brass: 0 0 0 1px rgba(217,164,74,0.25), 0 18px 50px -18px rgba(217,164,74,0.35);
}

*{ box-sizing:border-box; }
html{ scroll-behavior:smooth; }
html,body{ margin:0; padding:0; }
body{
  background:var(--ink);
  color:var(--text);
  font-family:var(--f-body);
  font-size:16px;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
::selection{ background:var(--brass); color:var(--ink); }

img,svg{ display:block; max-width:100%; }
a{ color:inherit; text-decoration:none; }
ul{ margin:0; padding:0; list-style:none; }
button{ font-family:inherit; cursor:pointer; }
input,select{ font-family:inherit; }

h1,h2,h3,h4{
  font-family:var(--f-display);
  font-weight:600;
  line-height:1.12;
  letter-spacing:-0.01em;
  margin:0;
  color:var(--text);
}
.numeral{ font-family:var(--f-mono); font-variant-numeric:tabular-nums; }

/* Visible focus state everywhere (accessibility floor) */
a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible{
  outline:2px solid var(--brass);
  outline-offset:2px;
  border-radius:4px;
}

/* Reduced motion respected globally */
@media (prefers-reduced-motion: reduce){
  *{ animation-duration:0.001ms !important; animation-iteration-count:1 !important; transition-duration:0.001ms !important; scroll-behavior:auto !important; }
}

.wrap{ max-width:var(--max); margin:0 auto; padding:0 24px; }
@media (min-width:768px){ .wrap{ padding:0 40px; } }

/* ---------- Grain / gauge backdrop (replaces stock video) ---------- */
.gauge-field{
  position:fixed; inset:0; z-index:0; pointer-events:none; overflow:hidden;
  background:
    radial-gradient(ellipse 60% 50% at 78% 18%, rgba(217,164,74,0.10) 0%, transparent 60%),
    radial-gradient(ellipse 55% 45% at 15% 85%, rgba(95,217,196,0.06) 0%, transparent 60%),
    var(--ink);
}
.gauge-field svg{ position:absolute; opacity:0.5; }
.gauge-field::after{
  content:''; position:absolute; inset:0;
  background-image:radial-gradient(rgba(245,244,240,0.035) 1px, transparent 1px);
  background-size:28px 28px;
  mask-image:radial-gradient(ellipse 70% 60% at 60% 30%, black 30%, transparent 75%);
}

/* ---------- Nav ---------- */
.site-nav{
  position:fixed; top:0; left:0; right:0; z-index:50;
  background:rgba(14,16,19,0.55);
  backdrop-filter:blur(14px); -webkit-backdrop-filter:blur(14px);
  border-bottom:1px solid var(--line);
  transition:background .3s ease, border-color .3s ease;
}
.site-nav .wrap{ height:76px; display:flex; align-items:center; justify-content:space-between; }
.brand{ display:flex; align-items:center; gap:11px; }
.brand-mark{
  width:38px; height:38px; border-radius:10px;
  border:1px solid var(--line-strong);
  background:linear-gradient(155deg, var(--surface-2), var(--surface));
  display:flex; align-items:center; justify-content:center;
  color:var(--brass);
}
.brand-name{ font-family:var(--f-display); font-weight:600; font-size:20px; letter-spacing:0.01em; }
.brand-name span{ color:var(--brass); }

.nav-links{ display:none; align-items:center; gap:34px; }
@media (min-width:900px){ .nav-links{ display:flex; } }
.nav-links a{
  font-size:14.5px; color:var(--text-dim); position:relative; padding:6px 0;
  transition:color .2s ease;
}
.nav-links a::after{
  content:''; position:absolute; left:0; bottom:0; width:0; height:1px; background:var(--brass);
  transition:width .25s ease;
}
.nav-links a:hover{ color:var(--text); }
.nav-links a:hover::after, .nav-links a[aria-current="page"]::after{ width:100%; }
.nav-links a[aria-current="page"]{ color:var(--text); }

.nav-cta{
  display:none;
  border:1px solid var(--line-strong);
  background:rgba(245,244,240,0.04);
  color:var(--text);
  padding:10px 20px;
  border-radius:999px;
  font-size:13.5px;
  align-items:center; gap:8px;
  transition:border-color .2s ease, background .2s ease, color .2s ease;
}
@media (min-width:900px){ .nav-cta{ display:inline-flex; } }
.nav-cta:hover{ border-color:var(--brass); color:var(--brass-hi); background:rgba(217,164,74,0.08); }

.nav-toggle{
  display:flex; align-items:center; justify-content:center;
  width:42px; height:42px; border-radius:10px;
  border:1px solid var(--line-strong); background:rgba(245,244,240,0.04); color:var(--text);
}
@media (min-width:900px){ .nav-toggle{ display:none; } }

.mobile-menu{
  display:none; position:fixed; inset:76px 0 0 0; z-index:49;
  background:rgba(14,16,19,0.97);
  backdrop-filter:blur(18px);
  border-top:1px solid var(--line);
  padding:28px 24px;
  flex-direction:column; gap:6px;
}
.mobile-menu.open{ display:flex; }
.mobile-menu a{
  padding:16px 4px; font-size:19px; font-family:var(--f-display);
  border-bottom:1px solid var(--line);
  color:var(--text);
}
.mobile-menu .nav-cta{ display:inline-flex; margin-top:18px; align-self:flex-start; }

/* ---------- Hero ---------- */
.hero{ position:relative; z-index:1; padding:150px 0 90px; }
.hero-grid{ display:grid; grid-template-columns:1fr; gap:56px; align-items:center; }
@media (min-width:1050px){ .hero-grid{ grid-template-columns:1.05fr 0.95fr; gap:40px; } }

.eyebrow-line{ display:flex; align-items:center; gap:10px; margin-bottom:22px; }
.eyebrow-line .bar{ width:26px; height:1.5px; background:var(--brass); }
.eyebrow-line span{ font-size:13px; color:var(--brass-hi); letter-spacing:0.02em; font-family:var(--f-mono); }

.hero h1{
  font-size:clamp(40px, 6vw, 70px);
  color:var(--text);
}
.hero h1 em{ font-style:italic; color:var(--brass-hi); font-weight:500; }

.hero-sub{
  margin-top:22px; max-width:460px;
  color:var(--text-dim); font-size:17px; line-height:1.65;
}

.hero-actions{ display:flex; flex-wrap:wrap; gap:14px; margin-top:36px; }
.btn{
  display:inline-flex; align-items:center; gap:10px;
  padding:15px 26px; border-radius:999px;
  font-size:14.5px; font-weight:600; letter-spacing:0.01em;
  transition:transform .25s ease, box-shadow .25s ease, background .25s ease, border-color .25s ease;
  border:1px solid transparent;
}
.btn-brass{
  background:var(--brass); color:var(--ink);
  box-shadow:0 14px 34px -14px rgba(217,164,74,0.55);
}
.btn-brass:hover{ transform:translateY(-2px); background:var(--brass-hi); }
.btn-ghost{
  border-color:var(--line-strong); color:var(--text); background:rgba(245,244,240,0.03);
}
.btn-ghost:hover{ border-color:var(--brass); color:var(--brass-hi); background:rgba(217,164,74,0.06); }

.hero-trust{ display:flex; gap:28px; margin-top:44px; flex-wrap:wrap; }
.trust-item .num{ font-family:var(--f-mono); font-size:22px; color:var(--brass-hi); }
.trust-item .lbl{ font-size:12.5px; color:var(--text-faint); margin-top:2px; }

/* ---------- Live calculator hero widget ---------- */
.dial-card{
  position:relative;
  background:linear-gradient(160deg, var(--surface-2), var(--surface) 60%);
  border:1px solid var(--line-strong);
  border-radius:var(--radius-lg);
  padding:30px;
  box-shadow:var(--shadow-brass), 0 40px 80px -30px rgba(0,0,0,0.7);
}
.dial-card::before{
  content:''; position:absolute; inset:0; border-radius:var(--radius-lg); padding:1px;
  background:linear-gradient(160deg, rgba(217,164,74,0.5), transparent 40%, rgba(95,217,196,0.15));
  -webkit-mask:linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite:xor; mask-composite:exclude;
  pointer-events:none;
}
.dial-head{ display:flex; align-items:center; justify-content:space-between; margin-bottom:22px; }
.dial-head .tag{ font-family:var(--f-mono); font-size:11.5px; color:var(--text-faint); letter-spacing:0.06em; }
.dial-dots{ display:flex; gap:5px; }
.dial-dots span{ width:6px; height:6px; border-radius:50%; background:var(--line-strong); }
.dial-dots span:first-child{ background:var(--brass); }

.dial-display{
  background:var(--ink); border:1px solid var(--line); border-radius:var(--radius-md);
  padding:22px 22px 18px; margin-bottom:20px;
}
.dial-display .result-label{ font-size:12px; color:var(--text-faint); margin-bottom:6px; }
.dial-display .result-value{
  font-family:var(--f-mono); font-size:clamp(30px, 4vw, 40px); color:var(--mint);
  letter-spacing:-0.01em;
}
.dial-display .result-sub{ font-size:12.5px; color:var(--text-dim); margin-top:6px; }

.dial-fields{ display:grid; gap:14px; }
.field{ display:flex; flex-direction:column; gap:7px; }
.field label{ font-size:12.5px; color:var(--text-dim); }
.field-row{ display:flex; gap:12px; }
.field-row .field{ flex:1; }
.field input, .field select{
  background:var(--surface); border:1px solid var(--line-strong); color:var(--text);
  border-radius:10px; padding:12px 13px; font-family:var(--f-mono); font-size:15px;
  width:100%;
}
.field input:focus, .field select:focus{ border-color:var(--brass); }
.dial-note{ font-size:12px; color:var(--text-faint); margin-top:16px; }

/* ---------- Sections ---------- */
.section{ position:relative; z-index:1; padding:88px 0; }
.section-head{ max-width:620px; margin-bottom:48px; }
.section-head .eyebrow-line{ margin-bottom:16px; }
.section-head h2{ font-size:clamp(30px, 4vw, 44px); }
.section-head p{ color:var(--text-dim); margin-top:14px; font-size:16px; }

.section-alt{ background:var(--ink-soft); border-top:1px solid var(--line); border-bottom:1px solid var(--line); }

/* Tool grid */
.category-block{ margin-bottom:52px; }
.category-block:last-child{ margin-bottom:0; }
.category-title{
  display:flex; align-items:baseline; gap:12px; margin-bottom:20px;
  font-family:var(--f-mono); font-size:13px; color:var(--text-faint); letter-spacing:0.04em;
}
.category-title .line{ flex:1; height:1px; background:var(--line); }

.tool-grid{ display:grid; grid-template-columns:1fr; gap:16px; }
@media (min-width:640px){ .tool-grid{ grid-template-columns:1fr 1fr; } }
@media (min-width:980px){ .tool-grid{ grid-template-columns:1fr 1fr 1fr; } }

.tool-card{
  display:block; padding:24px; border-radius:var(--radius-md);
  background:rgba(245,244,240,0.025);
  border:1px solid var(--line);
  transition:border-color .25s ease, background .25s ease, transform .25s ease;
}
.tool-card:hover{ border-color:rgba(217,164,74,0.4); background:rgba(245,244,240,0.045); transform:translateY(-3px); }
.tool-card .icon{
  width:42px; height:42px; border-radius:10px; margin-bottom:16px;
  background:var(--surface-2); border:1px solid var(--line-strong);
  display:flex; align-items:center; justify-content:center; color:var(--brass);
}
.tool-card h3{ font-size:18px; margin-bottom:8px; }
.tool-card p{ color:var(--text-dim); font-size:14px; margin:0; line-height:1.55; }
.tool-card .go{ margin-top:14px; font-size:13px; color:var(--brass-hi); display:flex; align-items:center; gap:6px; }

/* How it works — genuine sequence, numbering earned */
.steps{ display:grid; grid-template-columns:1fr; gap:28px; }
@media (min-width:820px){ .steps{ grid-template-columns:repeat(3,1fr); } }
.step .idx{ font-family:var(--f-mono); color:var(--brass); font-size:14px; margin-bottom:14px; }
.step h3{ font-size:19px; margin-bottom:10px; }
.step p{ color:var(--text-dim); font-size:14.5px; }

/* Ad slot placeholders — AdSense-ready containers */
.ad-slot{
  border:1px dashed var(--line-strong);
  border-radius:var(--radius-md);
  min-height:120px;
  display:flex; align-items:center; justify-content:center;
  color:var(--text-faint); font-size:12.5px; font-family:var(--f-mono);
  background:rgba(245,244,240,0.015);
  margin:44px 0;
}

/* Calculator tool page layout */
.tool-hero{ padding:150px 0 50px; position:relative; z-index:1; }
.tool-hero .crumbs{ font-size:13px; color:var(--text-faint); margin-bottom:18px; }
.tool-hero .crumbs a{ color:var(--text-dim); }
.tool-hero .crumbs a:hover{ color:var(--brass-hi); }
.tool-hero h1{ font-size:clamp(32px, 4.5vw, 48px); }
.tool-hero .lede{ margin-top:16px; max-width:640px; color:var(--text-dim); font-size:16.5px; }

.tool-layout{ display:grid; grid-template-columns:1fr; gap:40px; position:relative; z-index:1; }
@media (min-width:980px){ .tool-layout{ grid-template-columns:1.1fr 0.9fr; } }

.calc-panel{
  background:linear-gradient(160deg, var(--surface-2), var(--surface) 65%);
  border:1px solid var(--line-strong); border-radius:var(--radius-lg);
  padding:30px; box-shadow:var(--shadow-brass);
}
.calc-panel h2{ font-size:20px; margin-bottom:22px; }
.calc-actions{ display:flex; gap:12px; margin-top:24px; }
.calc-actions .btn{ padding:13px 22px; font-size:13.5px; }

.result-panel{
  background:var(--ink); border:1px solid var(--line); border-radius:var(--radius-md);
  padding:24px; margin-top:24px;
}
.result-row{ display:flex; justify-content:space-between; align-items:baseline; padding:11px 0; border-bottom:1px solid var(--line); }
.result-row:last-child{ border-bottom:none; }
.result-row .k{ font-size:13.5px; color:var(--text-dim); }
.result-row .v{ font-family:var(--f-mono); font-size:17px; color:var(--text); }
.result-row.primary .v{ color:var(--mint); font-size:24px; }

.article{ color:var(--text-dim); font-size:15.5px; line-height:1.75; }
.article h2{ color:var(--text); font-size:24px; margin:38px 0 14px; }
.article h2:first-child{ margin-top:0; }
.article h3{ color:var(--text); font-size:18px; margin:24px 0 10px; }
.article p{ margin:0 0 14px; }
.article ul{ margin:0 0 14px; padding-left:20px; list-style:disc; }
.article li{ margin-bottom:6px; }
.article strong{ color:var(--text); }
.formula-box{
  font-family:var(--f-mono); background:var(--ink-soft); border:1px solid var(--line-strong);
  border-radius:10px; padding:16px 18px; color:var(--mint); font-size:14.5px; margin:16px 0;
  overflow-x:auto;
}

.faq-item{ border-bottom:1px solid var(--line); padding:20px 0; }
.faq-item summary{ cursor:pointer; font-family:var(--f-display); font-size:17px; color:var(--text); list-style:none; display:flex; justify-content:space-between; gap:16px; }
.faq-item summary::-webkit-details-marker{ display:none; }
.faq-item summary::after{ content:'+'; color:var(--brass); font-family:var(--f-mono); font-size:20px; flex-shrink:0; }
.faq-item[open] summary::after{ content:'−'; }
.faq-item p{ color:var(--text-dim); margin:12px 0 0; font-size:14.5px; line-height:1.7; }

.related-tools{ display:grid; grid-template-columns:1fr; gap:14px; }
@media (min-width:640px){ .related-tools{ grid-template-columns:1fr 1fr; } }

/* ---------- Footer ---------- */
.site-footer{ position:relative; z-index:1; border-top:1px solid var(--line); padding:60px 0 30px; background:var(--ink-soft); }
.footer-grid{ display:grid; grid-template-columns:1fr; gap:36px; }
@media (min-width:820px){ .footer-grid{ grid-template-columns:1.3fr 1fr 1fr 1fr; } }
.footer-brand p{ color:var(--text-faint); font-size:14px; margin-top:14px; max-width:280px; line-height:1.6; }
.footer-col h4{ font-size:13px; color:var(--text-faint); font-family:var(--f-mono); margin-bottom:16px; letter-spacing:0.03em; }
.footer-col a{ display:block; color:var(--text-dim); font-size:14.5px; padding:6px 0; transition:color .2s ease; }
.footer-col a:hover{ color:var(--brass-hi); }
.footer-bottom{ display:flex; flex-wrap:wrap; gap:14px; justify-content:space-between; align-items:center; margin-top:48px; padding-top:24px; border-top:1px solid var(--line); }
.footer-bottom p{ color:var(--text-faint); font-size:13px; margin:0; }
.footer-legal-links{ display:flex; gap:18px; flex-wrap:wrap; }
.footer-legal-links a{ color:var(--text-faint); font-size:13px; }
.footer-legal-links a:hover{ color:var(--brass-hi); }

/* Legal / static page */
.legal-page{ position:relative; z-index:1; padding:150px 0 90px; }
.legal-page .content{ max-width:760px; }
.legal-page h1{ font-size:clamp(32px,4vw,46px); margin-bottom:8px; }
.legal-page .updated{ color:var(--text-faint); font-size:13.5px; font-family:var(--f-mono); margin-bottom:40px; }
.legal-page h2{ color:var(--text); font-size:21px; margin:34px 0 12px; }
.legal-page p, .legal-page li{ color:var(--text-dim); font-size:15px; line-height:1.75; }
.legal-page ul{ padding-left:20px; list-style:disc; margin:0 0 14px; }

/* Contact form */
.contact-form{ display:grid; gap:16px; max-width:520px; }
.contact-form .field-row{ display:grid; grid-template-columns:1fr 1fr; gap:14px; }
.contact-form textarea{
  background:var(--surface); border:1px solid var(--line-strong); color:var(--text);
  border-radius:10px; padding:13px; font-family:var(--f-body); font-size:14.5px; min-height:140px; resize:vertical;
}
.contact-form textarea:focus{ border-color:var(--brass); outline:none; }

/* 404 */
.notfound{ position:relative; z-index:1; min-height:80vh; display:flex; flex-direction:column; align-items:flex-start; justify-content:center; padding-top:100px; }
.notfound .code{ font-family:var(--f-mono); color:var(--brass); font-size:15px; margin-bottom:18px; }

@media (max-width:640px){
  .contact-form .field-row{ grid-template-columns:1fr; }
}