/* =========================================================
   CalcAsk Design System
   Tokens → Base → Layout → Components → Utilities
   ========================================================= */

:root{
  /* --- Light mode tokens --- */
  --bg: #FFFFFF;
  --surface: #FFFFFF;
  --surface-2: #F1EFE7;
  --border: #D8D4C8;
  --text: #0E1016;
  --text-muted: #494F60;
  --text-faint: #5D626F;

  --accent: #B8460A;        /* signal amber, darkened for WCAG AA text contrast */
  --accent-contrast: #FFFFFF; /* text color to use ON TOP of --accent */
  --accent-ink: #FFEADC;
  --accent-2: #00A99A;      /* precision teal, punched up */
  --accent-2-ink: #DAF5F2;
  --indigo: #16204A;        /* deep indigo, headers/gradients */
  --indigo-2: #2C3A78;

  --danger: #D3202B;
  --success: #128A4C;

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-full: 999px;

  --shadow-sm: 0 1px 2px rgba(14,16,22,.08), 0 1px 1px rgba(14,16,22,.06);
  --shadow-md: 0 8px 24px rgba(14,16,22,.12);
  --shadow-lg: 0 20px 48px rgba(14,16,22,.16);

  --font-display: -apple-system, BlinkMacSystemFont, "Segoe UI", "Inter", "Helvetica Neue", Arial, sans-serif;
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", "Inter", "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SF Mono", "JetBrains Mono", ui-monospace, "Cascadia Mono", Menlo, Consolas, monospace;

  --container: 1180px;
  --header-h: 72px;

  color-scheme: light;
}

[data-theme="dark"]{
  --bg: #0A0D13;
  --surface: #141826;
  --surface-2: #1C2233;
  --border: #2C3348;
  --text: #F5F6FA;
  --text-muted: #ABB2C4;
  --text-faint: #767E96;

  --accent: #FF9955;
  --accent-contrast: #1A1300;
  --accent-ink: #2E1E12;
  --accent-2: #2EE6D6;
  --accent-2-ink: #0F2B27;
  --indigo: #2E3F8F;
  --indigo-2: #44559E;

  --shadow-sm: 0 1px 2px rgba(0,0,0,.3);
  --shadow-md: 0 8px 24px rgba(0,0,0,.35);
  --shadow-lg: 0 24px 60px rgba(0,0,0,.5);

  color-scheme: dark;
}

/* ---------- Reset ---------- */
*,*::before,*::after{ box-sizing:border-box; margin:0; padding:0; }
html{ -webkit-text-size-adjust:100%; scroll-behavior:smooth; }
@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior:auto; }
  *,*::before,*::after{ animation-duration:.001ms !important; animation-iteration-count:1 !important; transition-duration:.001ms !important; scroll-behavior:auto !important; }
}
body{
  font-family:var(--font-body);
  background:var(--bg);
  color:var(--text);
  line-height:1.6;
  font-size:16px;
  -webkit-font-smoothing:antialiased;
}
img{ max-width:100%; display:block; }
a{ color:inherit; text-decoration:none; }
button{ font:inherit; cursor:pointer; }
input,select,textarea{ font:inherit; color:inherit; }
ul, ol{ list-style:none; }
h1,h2,h3,h4{ font-family:var(--font-display); line-height:1.15; letter-spacing:-0.02em; font-weight:800; }
:focus-visible{ outline:3px solid var(--accent); outline-offset:2px; border-radius:4px; }

/* ---------- Layout helpers ---------- */
.container{ max-width:var(--container); margin-inline:auto; padding-inline:20px; }
.section{ padding-block:64px; }
.grid{ display:grid; gap:20px; }
.visually-hidden{ position:absolute; width:1px; height:1px; overflow:hidden; clip:rect(0 0 0 0); white-space:nowrap; }
.skip-link{
  position:absolute; left:12px; top:-60px; background:var(--accent); color:#14171F;
  padding:10px 16px; border-radius:var(--radius-sm); z-index:200; font-weight:700; transition:top .2s ease;
}
.skip-link:focus{ top:12px; }

/* Graph-paper signature texture */
.ledger-grid{
  background-image:
    repeating-linear-gradient(0deg, transparent, transparent 27px, var(--border) 27px, var(--border) 28px),
    repeating-linear-gradient(90deg, transparent, transparent 27px, var(--border) 27px, var(--border) 28px);
  background-position:center;
  -webkit-mask-image:radial-gradient(ellipse 80% 60% at 50% 0%, #000 40%, transparent 90%);
          mask-image:radial-gradient(ellipse 80% 60% at 50% 0%, #000 40%, transparent 90%);
}

/* ---------- Header ---------- */
.site-header{
  position:sticky; top:0; z-index:100; height:var(--header-h);
  display:flex; align-items:center;
  background:var(--bg);
  border-bottom:1px solid var(--border);
}
.header-inner{ display:flex; align-items:center; gap:24px; width:100%; }
.brand{ display:flex; align-items:center; gap:8px; font-family:var(--font-display); font-weight:800; font-size:1.25rem; flex-shrink:0; }
.brand-calc{ color:var(--text); }
.brand-ask{ color:var(--accent); }
.brand-mark{ width:32px; height:32px; }
.brand-mark .eq{ fill:var(--accent); }
.brand-mark .frame{ fill:var(--indigo); }

.main-nav{ display:none; }
.main-nav ul{ display:flex; gap:4px; align-items:center; }
.main-nav > ul > li{ position:relative; }
.nav-link{
  display:flex; align-items:center; gap:4px; padding:10px 12px; border-radius:var(--radius-sm);
  font-weight:600; font-size:.94rem; color:var(--text-muted);
}
.nav-link:hover, .nav-link:focus-visible{ color:var(--text); background:var(--surface-2); }
.mega{
  position:absolute; top:100%; left:0; margin-top:8px; min-width:640px;
  background:var(--surface); border:1px solid var(--border); border-radius:var(--radius-md);
  box-shadow:var(--shadow-lg); padding:20px; display:none; grid-template-columns:repeat(3,1fr); gap:8px 24px;
}
.has-mega:hover .mega, .has-mega:focus-within .mega{ display:grid; }
.mega a{ display:block; padding:6px 8px; border-radius:6px; font-size:.9rem; color:var(--text-muted); }
.mega a:hover{ color:var(--accent); background:var(--surface-2); }
.mega-title{ font-size:.72rem; text-transform:uppercase; letter-spacing:.08em; color:var(--text-faint); padding:6px 8px; font-weight:700; }

.header-actions{ display:flex; align-items:center; gap:10px; margin-left:auto; }
.search-box{ position:relative; display:none; }
.search-box input{
  width:220px; padding:9px 12px 9px 36px; border-radius:var(--radius-full); border:1px solid var(--border);
  background:var(--surface-2); color:var(--text); font-size:.88rem;
}
.search-box svg{ position:absolute; left:11px; top:50%; transform:translateY(-50%); width:16px; height:16px; opacity:.6; }
.icon-btn{
  width:38px; height:38px; display:grid; place-items:center; border-radius:var(--radius-full);
  border:1px solid var(--border); background:var(--surface); color:var(--text-muted);
}
.icon-btn:hover{ color:var(--text); border-color:var(--text-faint); }
.icon-btn svg{ width:18px; height:18px; }
.hamburger{ display:grid; }
@media(min-width:960px){
  .main-nav{ display:block; }
  .search-box{ display:block; }
  .hamburger{ display:none; }
}

/* Mobile nav */
.mobile-nav{
  display:none; position:fixed; inset:var(--header-h) 0 0 0; background:var(--bg); z-index:90;
  overflow-y:auto; padding:20px;
}
.mobile-nav.open{ display:block; }
.mobile-nav details{ border-bottom:1px solid var(--border); padding:12px 0; }
.mobile-nav summary{ font-weight:700; font-size:1.05rem; list-style:none; display:flex; justify-content:space-between; cursor:pointer; }
.mobile-nav a{ display:block; padding:8px 0; color:var(--text-muted); }

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex; align-items:center; justify-content:center; gap:8px;
  padding:12px 22px; border-radius:var(--radius-full); font-weight:700; font-size:.95rem;
  border:1px solid transparent; transition:transform .15s ease, box-shadow .15s ease, background .15s ease;
}
.btn:active{ transform:translateY(1px); }
.btn-primary{ background:var(--accent); color:var(--accent-contrast); box-shadow:var(--shadow-sm); }
.btn-primary:hover{ box-shadow:var(--shadow-md); }
.btn-outline{ border-color:var(--border); color:var(--text); background:var(--surface); }
.btn-outline:hover{ border-color:var(--text-faint); }
.btn-ghost{ color:var(--text-muted); }
.btn-ghost:hover{ color:var(--text); }
.btn-sm{ padding:8px 14px; font-size:.85rem; }
.btn svg{ width:16px; height:16px; }

/* ---------- Breadcrumbs ---------- */
.breadcrumbs{ padding-block:16px; font-size:.85rem; color:var(--text-faint); }
.breadcrumbs ol{ display:flex; flex-wrap:wrap; gap:6px; align-items:center; }
.breadcrumbs a{ color:var(--text-muted); }
.breadcrumbs a:hover{ color:var(--accent); }
.breadcrumbs li:not(:last-child)::after{ content:"/"; margin-left:6px; opacity:.5; }

/* ---------- Hero ---------- */
.hero{ position:relative; padding-block:56px 40px; overflow:hidden; }
.hero-inner{ display:grid; gap:40px; align-items:center; }
@media(min-width:900px){ .hero-inner{ grid-template-columns:1.1fr .9fr; } }
.eyebrow{
  display:inline-flex; align-items:center; gap:6px; padding:6px 12px; border-radius:var(--radius-full);
  background:var(--accent-ink); color:var(--accent); font-weight:700; font-size:.78rem; letter-spacing:.03em; margin-bottom:16px;
}
.hero h1{ font-size:clamp(2.1rem, 4.2vw, 3.4rem); margin-bottom:16px; }
.hero h1 .hl{ color:var(--accent); }
.hero p.lead{ font-size:1.1rem; color:var(--text-muted); max-width:52ch; margin-bottom:24px; }
.hero-ctas{ display:flex; gap:12px; flex-wrap:wrap; }

/* Live demo calculator card in hero */
.demo-card{
  background:var(--surface); border:1px solid var(--border); border-radius:var(--radius-lg);
  box-shadow:var(--shadow-lg); padding:24px; position:relative;
}
.demo-card .ledger-grid{ position:absolute; inset:0; border-radius:var(--radius-lg); opacity:.6; pointer-events:none; }
.demo-card-inner{ position:relative; }
.demo-title{ font-weight:700; font-size:.95rem; margin-bottom:16px; display:flex; align-items:center; gap:8px; color:var(--text-muted); }
.demo-title .dot{ width:8px; height:8px; border-radius:50%; background:var(--accent-2); }
.field-row{ display:grid; grid-template-columns:1fr; gap:12px; margin-bottom:12px; }
.field label{ font-size:.78rem; color:var(--text-faint); font-weight:600; display:block; margin-bottom:6px; }
.field input{
  width:100%; padding:11px 12px; border-radius:var(--radius-sm); border:1px solid var(--border);
  background:var(--surface-2); font-family:var(--font-mono); font-variant-numeric:tabular-nums; font-size:1rem;
}
.demo-result{
  margin-top:16px; padding:18px; border-radius:var(--radius-md); background:var(--indigo); color:#fff;
  display:flex; align-items:baseline; justify-content:space-between;
}
.demo-result .val{ font-family:var(--font-mono); font-variant-numeric:tabular-nums; font-size:2rem; font-weight:700; }
.demo-result .lab{ font-size:.8rem; opacity:.8; }

/* ---------- Section headings ---------- */
.section-head{ display:flex; align-items:flex-end; justify-content:space-between; gap:16px; margin-bottom:28px; flex-wrap:wrap; }
.section-head h2{ font-size:clamp(1.5rem,2.6vw,2rem); }
.section-head p{ color:var(--text-muted); margin-top:6px; }

/* ---------- Cards / Calculator grid ---------- */
.calc-grid{ grid-template-columns:repeat(auto-fill, minmax(230px,1fr)); }
.calc-card{
  background:var(--surface); border:1px solid var(--border); border-radius:var(--radius-md);
  padding:20px; display:flex; flex-direction:column; gap:10px; transition:transform .15s ease, box-shadow .15s ease, border-color .15s ease;
}
.calc-card:hover{ transform:translateY(-3px); box-shadow:var(--shadow-md); border-color:transparent; }
.calc-icon{ width:40px; height:40px; border-radius:10px; background:var(--accent-2-ink); display:grid; place-items:center; }
.calc-icon svg{ width:20px; height:20px; color:var(--accent-2); }
.calc-card h3{ font-size:1.02rem; font-weight:700; }
.calc-card p{ font-size:.86rem; color:var(--text-muted); }
.calc-card .tag{ font-size:.72rem; color:var(--text-faint); font-weight:600; text-transform:uppercase; letter-spacing:.04em; }

.category-strip{ display:flex; gap:10px; overflow-x:auto; padding-bottom:6px; }
.category-pill{
  flex:0 0 auto; display:flex; align-items:center; gap:8px; padding:10px 16px; border-radius:var(--radius-full);
  border:1px solid var(--border); background:var(--surface); font-weight:600; font-size:.88rem; white-space:nowrap;
}
.category-pill:hover{ border-color:var(--accent); color:var(--accent); }

/* ---------- Calculator tool (on calculator pages) ---------- */
.tool-panel{
  background:var(--surface); border:1px solid var(--border); border-radius:var(--radius-lg);
  box-shadow:var(--shadow-md); padding:28px; position:relative; overflow:hidden;
}
.tool-panel .ledger-grid{ position:absolute; inset:0; opacity:.5; }
.tool-form{ position:relative; display:grid; gap:16px; }
.tool-field label{ font-weight:700; font-size:.85rem; margin-bottom:6px; display:flex; flex-wrap:wrap; justify-content:space-between; gap:2px 8px; }
.tool-field label .label-text{ white-space:nowrap; }
.tool-field .hint{ font-weight:400; color:var(--text-faint); font-size:.78rem; }
.tool-field input, .tool-field select{
  width:100%; padding:13px 14px; border-radius:var(--radius-sm); border:1px solid var(--border);
  background:var(--surface-2); font-family:var(--font-mono); font-variant-numeric:tabular-nums; font-size:1.05rem;
}
.tool-field input:invalid:not(:placeholder-shown){ border-color:var(--danger); }
.error-msg{ color:var(--danger); font-size:.8rem; margin-top:4px; display:none; }
.error-msg.show{ display:block; }
.tool-actions{ display:flex; gap:10px; flex-wrap:wrap; margin-top:6px; }
.result-box{
  position:relative; margin-top:8px; padding:22px; border-radius:var(--radius-md); background:var(--indigo);
  color:#fff; display:none;
}
.result-box.show{ display:block; }
.result-box .r-label{ font-size:.78rem; opacity:.75; text-transform:uppercase; letter-spacing:.05em; margin-bottom:6px; }
.result-box .r-value{ font-family:var(--font-mono); font-variant-numeric:tabular-nums; font-size:2.4rem; font-weight:800; }
.result-box .r-sub{ font-size:.85rem; opacity:.85; margin-top:6px; }
.result-actions{ display:flex; gap:8px; margin-top:14px; flex-wrap:wrap; }
.result-actions button{
  background:rgba(255,255,255,.12); color:#fff; border:1px solid rgba(255,255,255,.25);
  padding:7px 12px; border-radius:var(--radius-full); font-size:.78rem; font-weight:700; display:inline-flex; gap:6px; align-items:center;
}
.result-actions button:hover{ background:rgba(255,255,255,.22); }

/* ---------- Article / content typography ---------- */
.prose{ max-width:74ch; }
.prose h2{ font-size:1.5rem; margin-top:2.2em; margin-bottom:.6em; }
.prose h3{ font-size:1.2rem; margin-top:1.6em; margin-bottom:.5em; }
.prose p{ color:var(--text-muted); margin-bottom:1.1em; }
.prose ul, .prose ol{ margin:0 0 1.1em 1.3em; color:var(--text-muted); }
.prose ul{ list-style:disc; }
.prose ol{ list-style:decimal; }
.prose li{ margin-bottom:.4em; }
.prose table{ width:100%; border-collapse:collapse; margin:1.4em 0; font-size:.92rem; }
.prose th, .prose td{ border:1px solid var(--border); padding:10px 12px; text-align:left; }
.prose th{ background:var(--surface-2); font-weight:700; }
.prose .formula{
  font-family:var(--font-mono); background:var(--surface-2); border:1px solid var(--border);
  border-radius:var(--radius-sm); padding:14px 16px; margin:1em 0; font-size:.95rem; overflow-x:auto;
}
.prose blockquote{ border-left:3px solid var(--accent); padding-left:16px; color:var(--text-muted); font-style:italic; margin:1.2em 0; }
.meta-row{ display:flex; gap:18px; flex-wrap:wrap; color:var(--text-faint); font-size:.85rem; margin-bottom:24px; align-items:center; }
.meta-row .dot{ width:4px; height:4px; border-radius:50%; background:var(--text-faint); }

.faq-item{ border-bottom:1px solid var(--border); padding:16px 0; }
.faq-item summary{ font-weight:700; cursor:pointer; list-style:none; display:flex; justify-content:space-between; gap:12px; }
.faq-item summary::-webkit-details-marker{ display:none; }
.faq-item summary .chev{ transition:transform .2s ease; flex-shrink:0; }
.faq-item[open] summary .chev{ transform:rotate(180deg); }
.faq-item p{ color:var(--text-muted); margin-top:10px; }

.author-box{
  display:flex; gap:14px; align-items:center; padding:18px; border:1px solid var(--border);
  border-radius:var(--radius-md); background:var(--surface-2); margin:2em 0;
}
.author-avatar{ width:44px; height:44px; border-radius:50%; background:var(--indigo); display:grid; place-items:center; color:#fff; font-weight:700; flex-shrink:0; }
.author-box .name{ font-weight:700; font-size:.92rem; }
.author-box .role{ font-size:.8rem; color:var(--text-faint); }

/* Related grid */
.related-grid{ grid-template-columns:repeat(auto-fill,minmax(240px,1fr)); }

/* Ad slot */
.ad-slot{
  border:1px dashed var(--border); border-radius:var(--radius-md); padding:16px; text-align:center;
  color:var(--text-faint); font-size:.75rem; text-transform:uppercase; letter-spacing:.06em; min-height:90px;
  display:flex; align-items:center; justify-content:center; margin-block:32px;
}

/* ---------- Footer ---------- */
.site-footer{ border-top:1px solid var(--border); padding-block:56px 28px; margin-top:60px; background:var(--surface); }
.footer-grid{ grid-template-columns:1.4fr repeat(4,1fr); gap:28px; margin-bottom:40px; }
.footer-col h4{ font-size:.8rem; text-transform:uppercase; letter-spacing:.06em; color:var(--text-faint); margin-bottom:14px; }
.footer-col a{ display:block; color:var(--text-muted); font-size:.9rem; padding:5px 0; }
.footer-col a:hover{ color:var(--accent); }
.footer-brand p{ color:var(--text-muted); font-size:.9rem; margin:12px 0 16px; max-width:34ch; }
.footer-contact-link{ display:inline-flex; align-items:center; gap:8px; color:var(--text-muted); font-size:.88rem; font-weight:600; margin-bottom:18px; }
.footer-contact-link:hover{ color:var(--accent); }
.footer-contact-link svg{ width:16px; height:16px; flex-shrink:0; }

.footer-newsletter{
  display:flex; flex-wrap:wrap; align-items:center; justify-content:space-between; gap:20px;
  padding:28px; margin-bottom:36px; border-radius:var(--radius-lg); background:var(--surface-2); border:1px solid var(--border);
}
.footer-newsletter h4{ font-size:1.05rem; font-weight:800; margin-bottom:4px; }
.footer-newsletter p{ color:var(--text-muted); font-size:.88rem; max-width:40ch; }
.newsletter-form{ display:flex; gap:8px; flex-wrap:wrap; }
.newsletter-form input{
  padding:12px 14px; border-radius:var(--radius-full); border:1px solid var(--border);
  background:var(--surface); min-width:220px; font-size:.9rem;
}
.newsletter-status{ font-size:.82rem; color:var(--accent-2); margin-top:8px; display:none; }
.newsletter-status.show{ display:block; }

.footer-trust{ display:flex; flex-wrap:wrap; gap:14px 28px; padding-block:24px; border-top:1px solid var(--border); margin-bottom:8px; }
.trust-item{ display:flex; align-items:center; gap:8px; font-size:.82rem; color:var(--text-muted); font-weight:600; }
.trust-item svg{ width:18px; height:18px; color:var(--accent-2); flex-shrink:0; }

.footer-bottom{ display:flex; justify-content:space-between; align-items:center; flex-wrap:wrap; gap:12px; padding-top:24px; border-top:1px solid var(--border); font-size:.82rem; color:var(--text-faint); }
.footer-bottom a{ color:var(--text-faint); }
.footer-bottom a:hover{ color:var(--accent); }
.footer-legal-links{ display:flex; flex-wrap:wrap; gap:4px; }
.socials{ display:flex; gap:8px; }
.back-to-top{
  display:inline-flex; align-items:center; gap:6px; padding:8px 14px; border-radius:var(--radius-full);
  border:1px solid var(--border); background:var(--surface); color:var(--text-muted); font-size:.8rem; font-weight:700;
}
.back-to-top:hover{ color:var(--text); border-color:var(--text-faint); }
.back-to-top svg{ width:14px; height:14px; }
@media(max-width:640px){ .footer-newsletter{ flex-direction:column; align-items:flex-start; } .newsletter-form{ width:100%; } .newsletter-form input{ flex:1; } }

@media(min-width:560px){ .field-row{ grid-template-columns:repeat(2,1fr); } .field-row .tool-field label{ min-height:40px; align-content:flex-start; } }
@media(max-width:900px){ .footer-grid{ grid-template-columns:1fr 1fr; } }
@media(max-width:520px){ .footer-grid{ grid-template-columns:1fr; } }