/* ============================================================
   CALCSITE DESIGN SYSTEM — v2
   Display: Work Sans ExtraBold / Body: Merriweather Light / Buttons: Work Sans Bold
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Work+Sans:wght@400;500;600;700;800&family=Merriweather:wght@300;400;700&display=swap');

:root{
  /* --- core palette --- */
  --bg:            #FFFFFF;
  --panel:         #FFFFFF;
  --panel-2:       #F4F4F4;
  --ink:           #000000;
  --ink-soft:      #3D3D3D;
  --border:        #E2E2E2;
  --border-soft:   #EFEFEF;

  /* --- signature accent --- */
  --orange:        #20C1BD;
  --orange-dim:    #1AA6A3;
  --amber:         #20C1BD;

  /* --- category colors (single accent per style guide) --- */
  --cat-math:      #20C1BD;
  --cat-stats:     #20C1BD;
  --cat-time:      #20C1BD;
  --cat-finance:   #20C1BD;
  --cat-health:    #20C1BD;
  --cat-misc:      #20C1BD;

  /* --- type --- */
  --font-display: 'Work Sans', sans-serif;
  --font-body:    'Merriweather', serif;
  --font-mono:    'Work Sans', sans-serif;

  --radius: 8px;
  --radius-sm: 4px;
}

*{ box-sizing:border-box; }
html{ scroll-behavior:smooth; }
body{
  margin:0;
  background:var(--bg);
  color:var(--ink);
  font-family:var(--font-body);
  font-weight:300;
  font-size:16px;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  padding-top:8px; /* room for the fixed top accent bar */
}
body::before{
  content:"";
  position:fixed; top:0; left:0; right:0; height:8px;
  background:var(--orange); z-index:200;
}
a{ color:inherit; text-decoration:none; }
h1,h2,h3{ font-family:var(--font-display); font-weight:800; margin:0; letter-spacing:-0.01em; }
p{ margin:0 0 .75em; color:var(--ink-soft); }
button{ font-family:inherit; cursor:pointer; }

/* focus visibility */
a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible{
  outline:2px solid var(--orange);
  outline-offset:2px;
}
@media (prefers-reduced-motion: reduce){
  *{ animation-duration:.001ms !important; transition-duration:.001ms !important; }
}

/* ============ TOP NAV ============ */
.topnav{
  position:sticky; top:8px; z-index:50;
  background:rgba(255,255,255,.92);
  backdrop-filter:blur(8px);
  border-bottom:1px solid var(--border);
}
.topnav-inner{
  max-width:1200px; margin:0 auto; padding:14px 24px;
  display:flex; align-items:center; gap:28px;
}
.brand{
  font-family:var(--font-display); font-weight:800; font-size:19px;
  display:flex; align-items:center; gap:8px;
}
.brand-mark{
  width:26px; height:26px; border-radius:6px;
  background:var(--orange); color:#fff;
  display:flex; align-items:center; justify-content:center;
  font-family:var(--font-mono); font-size:13px; font-weight:700;
}
.nav-cats{ display:flex; gap:4px; flex-wrap:wrap; }
.nav-cats a{
  font-family:var(--font-mono); font-size:13.5px; font-weight:500; color:var(--ink-soft);
  padding:7px 12px; border-radius:100px;
}
.nav-cats a:hover{ background:var(--border-soft); color:var(--ink); }
.nav-search{ margin-left:auto; }
.nav-search input{
  font-family:var(--font-mono); font-size:14px;
  border:1px solid var(--border); border-radius:100px;
  padding:8px 14px; width:200px; background:var(--panel-2); color:var(--ink);
}
.nav-search input::placeholder{ color:var(--ink-soft); }

/* ============ CONTAINER ============ */
.wrap{ max-width:1200px; margin:0 auto; padding:0 24px; }

/* ============ HERO (home) ============ */
.hero{ padding:56px 0 40px; }
.hero-eyebrow{
  display:inline-flex; align-items:center; gap:8px;
  font-family:var(--font-mono); font-size:13px; font-weight:600;
  color:var(--ink); background:var(--panel-2);
  border-radius:100px; padding:8px 16px; margin-bottom:22px;
}
.hero-eyebrow a{ color:var(--orange); font-weight:700; }
.hero h1{ font-size:52px; max-width:680px; }
.hero h1 .accent{ color:var(--orange); }
.hero p.lead{ font-size:17px; max-width:560px; margin-top:18px; color:var(--ink-soft); font-weight:300; }

/* ============ RULER / TICK DECORATION (signature) ============ */
.ruler{
  position:relative;
  padding-left:18px;
}
.ruler::before{
  content:"";
  position:absolute; left:0; top:0; bottom:0; width:1px;
  background:repeating-linear-gradient(
    to bottom,
    var(--border) 0, var(--border) 1px,
    transparent 1px, transparent 9px
  );
}
.ruler::after{
  content:"";
  position:absolute; left:-3px; top:0; bottom:0; width:7px;
  background-image:repeating-linear-gradient(
    to bottom,
    var(--ink-soft) 0, var(--ink-soft) 1px,
    transparent 1px, transparent 9px
  );
  background-size:1px 9px; background-repeat:repeat-y; opacity:.35;
  mask-image:linear-gradient(to bottom, transparent, black 4px, black calc(100% - 4px), transparent);
}

/* ============ CATEGORY GRID (home) ============ */
.cat-grid{
  display:grid; grid-template-columns:repeat(auto-fit,minmax(180px,1fr));
  gap:14px; margin:32px 0 48px;
}
.cat-card{
  display:flex; flex-direction:column; align-items:flex-start;
  background:var(--panel); border:1px solid var(--border); border-radius:var(--radius);
  padding:18px; transition:transform .15s ease, box-shadow .15s ease;
}
.cat-card:hover{ transform:translateY(-2px); box-shadow:0 8px 20px rgba(0,0,0,.08); }
.cat-card .dot{ display:block; flex:none; width:9px; height:9px; border-radius:50%; margin-bottom:12px; background:var(--orange) !important; }
.cat-card h3{ font-size:16px; font-weight:700; }
.cat-card .count{ font-family:var(--font-mono); font-size:12.5px; color:var(--ink-soft); margin-top:4px; }

/* ============ TOOL CARD GRID ============ */
.tool-grid{
  display:grid; grid-template-columns:repeat(auto-fill,minmax(240px,1fr));
  gap:12px; margin:24px 0 56px;
}
.tool-card{
  background:var(--panel); border:1px solid var(--border); border-radius:var(--radius-sm);
  padding:16px; display:flex; flex-direction:column; gap:6px;
}
.tool-card:hover{ border-color:var(--orange); }
.tool-card .tool-name{ font-family:var(--font-mono); font-weight:600; font-size:14.5px; }
.tool-card .tool-desc{ font-size:12.5px; color:var(--ink-soft); margin:0; }

/* ============ CALCULATOR PAGE LAYOUT ============ */
.calc-header{ padding:36px 0 8px; }
.calc-breadcrumb{ font-family:var(--font-mono); font-size:13px; color:var(--ink-soft); margin-bottom:10px; }
.calc-breadcrumb a:hover{ color:var(--orange); }
.calc-header h1{ font-size:30px; }
.calc-header p.lead{ font-size:15.5px; margin-top:8px; max-width:640px; }

.calc-layout{
  display:grid; grid-template-columns:minmax(320px,480px) minmax(280px,360px);
  gap:28px; align-items:start; padding:24px 0 60px;
  max-width:868px; margin:0 auto;
}
@media (max-width:860px){
  .calc-layout{ grid-template-columns:1fr; max-width:none; }
}

.calc-panel{
  background:var(--panel); border:1px solid var(--border); border-radius:var(--radius);
  padding:24px;
}
.field-row{ display:grid; grid-template-columns:1fr; gap:16px; margin-bottom:16px; }
.field-row.split{ grid-template-columns:1fr 1fr; }
label{ display:block; font-family:var(--font-mono); font-size:13px; font-weight:600; margin-bottom:6px; color:var(--ink); }
input[type=number], input[type=text], select{
  width:100%; font-family:var(--font-mono); font-size:15px;
  border:1px solid var(--border); border-radius:var(--radius-sm);
  padding:10px 12px; background:var(--panel-2); color:var(--ink);
}
input:focus, select:focus{ border-color:var(--orange); }
select option{ background:var(--panel-2); color:var(--ink); }
.unit-suffix{ font-family:var(--font-mono); font-size:12px; color:var(--ink-soft); margin-top:4px; }

.btn-primary{
  background:var(--orange); color:#fff; border:none;
  padding:12px 20px; border-radius:var(--radius-sm);
  font-family:var(--font-mono); font-weight:700; font-size:14.5px; width:100%; margin-top:6px;
  transition:background .15s ease;
}
.btn-primary:hover{ background:var(--orange-dim); }

/* --- result readout: the signature element --- */
.readout{
  position:sticky; top:100px;
  background:var(--panel-2); color:var(--ink);
  border:1px solid var(--orange);
  border-radius:var(--radius); padding:22px 22px 20px 30px;
  position:relative; overflow:hidden;
}
.readout .ruler::before{ background:repeating-linear-gradient(to bottom, rgba(0,0,0,.14) 0, rgba(0,0,0,.14) 1px, transparent 1px, transparent 9px); }
.readout .ruler::after{ background-image:repeating-linear-gradient(to bottom, rgba(0,0,0,.4) 0, rgba(0,0,0,.4) 1px, transparent 1px, transparent 9px); }
.readout-label{
  font-family:var(--font-mono); font-size:11.5px; letter-spacing:.08em;
  text-transform:uppercase; color:rgba(0,0,0,.55); margin-bottom:8px;
}
.readout-value{
  font-family:var(--font-mono); font-size:38px; font-weight:700;
  color:var(--orange); line-height:1.1; word-break:break-word;
}
.readout-unit{ font-family:var(--font-mono); font-size:16px; color:rgba(0,0,0,.55); margin-left:6px; }
.readout-sub{
  margin-top:16px; padding-top:16px; border-top:1px solid rgba(0,0,0,.12);
  font-size:13px; color:rgba(0,0,0,.7);
}
.readout-sub .row{ display:flex; justify-content:space-between; padding:4px 0; font-family:var(--font-mono); font-size:12.5px; }

/* explainer / SEO copy block */
.explainer{
  max-width:760px; margin-top:12px;
  border-top:1px solid var(--border); padding-top:32px;
}
.explainer h2{ font-size:20px; margin-bottom:10px; }
.explainer h3{ font-size:16px; margin:20px 0 8px; }

/* footer */
.site-footer{
  background:#000000; padding:32px 0; margin-top:40px;
}
.site-footer p{
  font-family:var(--font-mono); font-size:12px; font-weight:500;
  color:#FFFFFF; text-align:center; letter-spacing:.04em; margin:0;
}

/* utility */
.badge{
  display:inline-block; font-family:var(--font-mono); font-size:11px;
  padding:4px 10px; border-radius:100px; font-weight:700;
  background:transparent !important; color:var(--orange) !important;
  border:1px solid var(--orange);
}

/* ============================================================
   V2 ADDITIONS — dark mode, search dropdown, toggle, copy, related
   ============================================================ */

/* ---------- DARK MODE (toggle-driven) ---------- */
[data-theme="dark"]{
  --bg:            #121A2B;
  --panel:         #1C2739;
  --panel-2:       #232F44;
  --ink:           #FFFFFF;
  --ink-soft:      #9BA5B8;
  --border:        #2C394F;
  --border-soft:   #263248;
}
[data-theme="dark"] body{ background:var(--bg); color:var(--ink); }
[data-theme="dark"] .topnav{ background:rgba(18,26,43,.92); }
[data-theme="dark"] .readout-label{ color:rgba(255,255,255,.55); }
[data-theme="dark"] .readout-unit{ color:rgba(255,255,255,.55); }
[data-theme="dark"] .readout-sub{ border-top-color:rgba(255,255,255,.14); color:rgba(255,255,255,.7); }
[data-theme="dark"] .readout .ruler::before{ background:repeating-linear-gradient(to bottom, rgba(255,255,255,.18) 0, rgba(255,255,255,.18) 1px, transparent 1px, transparent 9px); }
[data-theme="dark"] .readout .ruler::after{ background-image:repeating-linear-gradient(to bottom, rgba(255,255,255,.5) 0, rgba(255,255,255,.5) 1px, transparent 1px, transparent 9px); }
[data-theme="dark"] .cat-card:hover{ box-shadow:0 8px 20px rgba(0,0,0,.35); }
[data-theme="dark"] .site-footer{ background:#000000; }

/* ---------- THEME TOGGLE BUTTON ---------- */
.theme-toggle{
  flex:none; width:36px; height:36px; border-radius:50%;
  border:1px solid var(--border); background:var(--panel-2);
  font-size:15px; line-height:1; color:var(--ink);
  display:flex; align-items:center; justify-content:center;
}
.theme-toggle:hover{ border-color:var(--orange); }
.theme-icon-dark{ display:none; }
[data-theme="dark"] .theme-icon-light{ display:none; }
[data-theme="dark"] .theme-icon-dark{ display:inline; }

/* ---------- NAV SEARCH DROPDOWN ---------- */
.search-dropdown{
  display:none;
  position:absolute; top:calc(100% + 6px); right:0; width:300px;
  background:var(--panel); border:1px solid var(--border); border-radius:var(--radius-sm);
  box-shadow:0 12px 32px rgba(0,0,0,.14);
  overflow:hidden; z-index:100;
}
.search-dropdown.open{ display:block; }
.search-dropdown a{
  display:flex; justify-content:space-between; align-items:center; gap:10px;
  padding:10px 14px; font-family:var(--font-mono); font-size:13.5px;
  border-bottom:1px solid var(--border-soft);
}
.search-dropdown a:last-child{ border-bottom:none; }
.search-dropdown a:hover{ background:var(--panel-2); }
.search-dropdown .sr-title{ font-weight:600; color:var(--ink); }
.search-dropdown .sr-cat{ flex:none; font-size:11px; color:var(--orange); }
.search-empty{
  padding:14px; font-family:var(--font-mono); font-size:13px; color:var(--ink-soft);
}

/* ---------- COPY BUTTON ---------- */
.copy-btn{
  position:absolute; top:14px; right:14px;
  font-family:var(--font-mono); font-size:11.5px; font-weight:700;
  padding:5px 12px; border-radius:100px;
  background:transparent; color:var(--orange);
  border:1px solid var(--orange);
  transition:background .15s ease, color .15s ease;
}
.copy-btn:hover{ background:var(--orange); color:#fff; }

/* ---------- RELATED CALCULATORS ---------- */
.related-calcs{ margin-top:24px; }
.related-calcs h2{ font-size:20px; margin-bottom:14px; }

/* ---------- HOMEPAGE FILTER CHIPS ---------- */
.filter-chips{
  display:flex; gap:8px; flex-wrap:wrap; margin:8px 0 20px;
}
.filter-chip{
  font-family:var(--font-mono); font-size:13px; font-weight:600;
  padding:7px 16px; border-radius:100px;
  background:var(--panel-2); color:var(--ink-soft);
  border:1px solid var(--border); cursor:pointer;
  transition:all .15s ease;
}
.filter-chip:hover{ border-color:var(--orange); color:var(--ink); }
.filter-chip.active{ background:var(--orange); color:#fff; border-color:var(--orange); }
.home-search{
  width:100%; max-width:480px;
  font-family:var(--font-mono); font-size:15px;
  border:1px solid var(--border); border-radius:100px;
  padding:12px 20px; background:var(--panel-2); color:var(--ink);
  margin-bottom:16px;
}
.home-search:focus{ border-color:var(--orange); outline:none; }
.no-results-msg{
  font-family:var(--font-mono); font-size:14px; color:var(--ink-soft);
  padding:32px 0; text-align:center; display:none;
}

/* ---------- CATEGORY HUB PAGES ---------- */
.cat-hub-header{ padding:40px 0 10px; }
.cat-hub-header h1{ font-size:36px; }
.cat-hub-header .count-line{
  font-family:var(--font-mono); font-size:14px; color:var(--ink-soft); margin-top:8px;
}