/* ===========================================================
   CalculatorMax — Reskin 2.0
   Clean, modern, professional. Ad-friendly. Mobile-first.
   Palette: crisp white base, deep navy ink, vivid blue accent.
   Type: Inter (body) + Sora (display) — clean and trustworthy.
   =========================================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=Sora:wght@600;700;800&display=swap');

:root {
  /* Colours */
  --bg:           #F7F8FA;
  --surface:      #FFFFFF;
  --surface-2:    #F0F2F5;
  --ink:          #0D1117;
  --ink-2:        #3D4A5C;
  --ink-3:        #7A8899;
  --border:       #E2E6ED;
  --accent:       #2563EB;        /* blue */
  --accent-dark:  #1D4ED8;
  --accent-soft:  #EFF6FF;
  --accent-mid:   #BFDBFE;
  --green:        #059669;
  --green-soft:   #ECFDF5;
  --amber:        #D97706;
  --amber-soft:   #FFFBEB;
  --error:        #DC2626;

  /* Type */
  --font-head: 'Sora', system-ui, sans-serif;
  --font-body: 'Inter', system-ui, sans-serif;

  /* Spacing / shape */
  --radius:    12px;
  --radius-sm: 8px;
  --radius-xs: 5px;
  --max:       1160px;

  /* Shadows */
  --shadow-xs: 0 1px 2px rgba(13,17,23,.06);
  --shadow-sm: 0 1px 3px rgba(13,17,23,.08), 0 4px 12px rgba(13,17,23,.05);
  --shadow:    0 2px 8px rgba(13,17,23,.08), 0 12px 32px rgba(13,17,23,.07);
}

/* ── Reset ─────────────────────────────────────────────── */
*,*::before,*::after { box-sizing:border-box; margin:0; padding:0; }
html { scroll-behavior:smooth; }
body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.65;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}
img { max-width:100%; display:block; }
a  { color:var(--accent); text-decoration:none; }
a:hover { text-decoration:underline; }
:focus-visible { outline:2px solid var(--accent); outline-offset:3px; border-radius:3px; }

/* ── Typography ─────────────────────────────────────────── */
h1,h2,h3,h4 {
  font-family: var(--font-head);
  color: var(--ink);
  line-height: 1.2;
  font-weight: 700;
}
h1 { font-size: clamp(1.75rem, 4vw, 2.75rem); letter-spacing:-.02em; }
h2 { font-size: clamp(1.2rem, 2.5vw, 1.6rem);  letter-spacing:-.01em; margin-top:2em; margin-bottom:.5em; }
h3 { font-size: 1.1rem; }
h4 { font-size: .95rem; }
p  { color:var(--ink-2); margin-bottom:1em; }
ul,ol { color:var(--ink-2); }
.container { max-width:var(--max); margin:0 auto; padding:0 20px; }

/* ── Header ─────────────────────────────────────────────── */
.site-header {
  position: sticky; top:0; z-index:100;
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(148,163,184,0.22);
  box-shadow: 0 8px 24px rgba(15, 23, 42, 0.06);
}
.nav-row {
  display: flex; align-items:center; justify-content:space-between;
  padding: 0 20px; height: 72px; max-width:var(--max); margin:0 auto; gap:20px;
}
.logo {
  display:flex; align-items:center; gap:10px;
  font-family: var(--font-head); font-weight:800; font-size:1.18rem;
  color: var(--ink); white-space:nowrap; letter-spacing:-0.02em;
}
.logo:hover { text-decoration:none; }
.logo-icon {
  width:32px; height:32px; border-radius:10px;
  background: linear-gradient(135deg, var(--accent), #3b82f6);
  box-shadow: 0 8px 18px rgba(59,130,246,0.25);
  display:flex; align-items:center; justify-content:center; flex-shrink:0;
}
.logo-icon svg { width:16px; height:16px; stroke:#fff; fill:none; }
.logo .tld { color:var(--accent); font-weight:700; }

.main-nav {
  display:flex; align-items:center; gap:6px;
  padding: 6px;
  border: 1px solid rgba(148,163,184,0.18);
  border-radius: 999px;
  background: rgba(248,250,252,0.85);
}
.main-nav a {
  color:var(--ink-2); font-size:.9rem; font-weight:600;
  padding:8px 14px; border-radius:999px;
  transition:all .15s ease;
}
.main-nav a:hover {
  background: rgba(148,163,184,0.12);
  color:var(--ink);
  text-decoration:none;
}
.main-nav a.active {
  color:var(--accent);
  background: rgba(59,130,246,0.1);
  box-shadow: inset 0 0 0 1px rgba(59,130,246,0.12);
}

.nav-toggle {
  display:none; background: rgba(248,250,252,0.9); border:1px solid var(--border);
  border-radius:10px; padding:8px 10px; cursor:pointer;
  color:var(--ink); font-size:1.1rem; line-height:1;
}

/* ── Buttons ─────────────────────────────────────────────── */
.btn {
  display:inline-flex; align-items:center; justify-content:center; gap:6px;
  font-family:var(--font-body); font-weight:600; font-size:.9rem;
  padding:10px 20px; border-radius:var(--radius-sm);
  border:1.5px solid transparent; cursor:pointer; transition:all .15s;
  line-height:1;
}
.btn:hover { text-decoration:none; }
.btn-primary { background:var(--accent); color:#fff; border-color:var(--accent); }
.btn-primary:hover { background:var(--accent-dark); border-color:var(--accent-dark); }
.btn-ghost { background:#fff; border-color:var(--border); color:var(--ink-2); }
.btn-ghost:hover { border-color:var(--accent); color:var(--accent); background:var(--accent-soft); }

/* ── Hero ────────────────────────────────────────────────── */
.hero {
  padding: 60px 0 48px;
  background: linear-gradient(160deg, var(--accent-soft) 0%, var(--surface) 60%);
  border-bottom: 1px solid var(--border);
}
.hero-inner { max-width: 640px; }
.hero-badge {
  display:inline-flex; align-items:center; gap:6px;
  background:#fff; border:1px solid var(--accent-mid);
  color:var(--accent); font-size:.78rem; font-weight:600;
  padding:4px 12px; border-radius:100px; margin-bottom:20px;
}
.hero-badge span { width:6px; height:6px; border-radius:50%; background:var(--accent); }
.hero h1 { margin-bottom:14px; }
.hero p.lead { font-size:1.05rem; color:var(--ink-2); max-width:54ch; margin-bottom:24px; }

.search-wrap {
  position:relative; max-width:520px;
}
.search-wrap svg {
  position:absolute; left:14px; top:50%; transform:translateY(-50%);
  color:var(--ink-3); pointer-events:none; width:18px; height:18px;
}
.search-wrap input {
  width:100%; padding:13px 16px 13px 44px; font-size:.95rem;
  font-family:var(--font-body); border:1.5px solid var(--border);
  border-radius:var(--radius); background:#fff;
  box-shadow:var(--shadow-sm); color:var(--ink);
  transition:border-color .15s;
}
.search-wrap input:focus { border-color:var(--accent); outline:none; }
.search-wrap input::placeholder { color:var(--ink-3); }

.hero-stats {
  display:flex; gap:32px; margin-top:32px; flex-wrap:wrap;
}
.hero-stats .stat strong {
  display:block; font-family:var(--font-head);
  font-size:1.7rem; font-weight:800; color:var(--ink); letter-spacing:-.02em;
}
.hero-stats .stat span { font-size:.8rem; color:var(--ink-3); }

/* ── Section titles ──────────────────────────────────────── */
.section-head {
  display:flex; align-items:baseline; justify-content:space-between;
  padding: 48px 0 20px; gap:10px; flex-wrap:wrap; border-bottom:1px solid var(--border);
  margin-bottom:24px;
}
.section-head h2 { margin:0; font-size:1.3rem; }
.section-head .pill {
  background:var(--surface-2); color:var(--ink-3); font-size:.78rem;
  font-weight:600; padding:3px 10px; border-radius:100px;
}

/* ── Category grid (homepage) ────────────────────────────── */
.cat-grid { display:grid; grid-template-columns:repeat(auto-fill,minmax(260px,1fr)); gap:16px; padding-bottom:64px; }

.cat-card {
  background:var(--surface); border:1px solid var(--border);
  border-radius:var(--radius); padding:22px;
  box-shadow:var(--shadow-xs);
  transition:border-color .18s, box-shadow .18s, transform .18s;
}
.cat-card:hover { border-color:var(--accent-mid); box-shadow:var(--shadow-sm); transform:translateY(-2px); }

.cat-head { display:flex; align-items:center; gap:10px; margin-bottom:6px; }
.cat-icon {
  width:36px; height:36px; border-radius:var(--radius-sm);
  display:flex; align-items:center; justify-content:center;
  font-size:1.1rem; flex-shrink:0;
  background:var(--accent-soft);
}
.cat-card h3 { margin:0; font-size:1rem; }
.cat-desc { font-size:.83rem; color:var(--ink-3); margin-bottom:12px; }
.cat-card ul { list-style:none; display:flex; flex-direction:column; gap:2px; }
.cat-card li a {
  font-size:.875rem; color:var(--ink-2); padding:5px 6px;
  border-radius:var(--radius-xs); display:flex;
  justify-content:space-between; align-items:center;
  transition:background .12s, color .12s;
}
.cat-card li a:hover { background:var(--accent-soft); color:var(--accent); text-decoration:none; }
.cat-card li a .arr { opacity:0; font-size:.8rem; transition:opacity .12s, transform .12s; transform:translateX(-4px); }
.cat-card li a:hover .arr { opacity:1; transform:translateX(0); }
.badge-soon {
  font-size:.68rem; font-weight:600; color:var(--ink-3);
  background:var(--surface-2); border:1px solid var(--border);
  padding:1px 6px; border-radius:4px; margin-left:6px;
}
.cat-more { margin-top:10px; font-size:.82rem; font-weight:600; color:var(--accent); display:inline-block; padding:4px 6px; }

/* ── Calculator page layout ──────────────────────────────── */
.calc-page { padding: 28px 0 72px; }
.breadcrumb { font-size:.82rem; color:var(--ink-3); margin-bottom:20px; display:flex; align-items:center; gap:4px; flex-wrap:wrap; }
.breadcrumb a { color:var(--ink-3); }
.breadcrumb a:hover { color:var(--accent); }
.breadcrumb .sep { color:var(--border); }

.calc-layout {
  display:grid;
  grid-template-columns: minmax(0,1fr) 330px;
  gap:32px; align-items:start;
}
.calc-main { min-width:0; }

/* ── Calc intro box ──────────────────────────────────────── */
.calc-intro {
  background:var(--surface); border:1px solid var(--border);
  border-radius:var(--radius); padding:28px 28px 24px;
  box-shadow:var(--shadow-xs); margin-bottom:28px;
}
.calc-intro h1 { font-size:clamp(1.4rem,3vw,2rem); margin-bottom:8px; }
.calc-intro .lead { font-size:.97rem; color:var(--ink-2); margin-bottom:0; }

/* ── Article content ─────────────────────────────────────── */
.calc-article { font-size:.97rem; }
.calc-article h2 {
  font-size:1.2rem; margin-top:2.2em; margin-bottom:.6em;
  padding-bottom:.4em; border-bottom:1px solid var(--border);
}
.calc-article h2:first-child { margin-top:0; }
.calc-article p { color:var(--ink-2); }
.calc-article ul, .calc-article ol { padding-left:1.4em; margin-bottom:1em; }
.calc-article li { margin-bottom:.35em; }
.calc-article strong { color:var(--ink); }

.calc-article table { width:100%; border-collapse:collapse; margin:20px 0; font-size:.9rem; border-radius:var(--radius-sm); overflow:hidden; border:1px solid var(--border); }
.calc-article th { background:var(--surface-2); font-weight:600; font-size:.82rem; color:var(--ink-2); text-align:left; padding:10px 14px; }
.calc-article td { padding:9px 14px; border-top:1px solid var(--border); color:var(--ink-2); }
.calc-article tr:hover td { background:var(--accent-soft); }

.formula-box {
  background:var(--accent-soft); border-left:3px solid var(--accent);
  border-radius:0 var(--radius-sm) var(--radius-sm) 0;
  padding:14px 18px; font-family:monospace; font-size:.95rem;
  color:var(--accent-dark); margin:16px 0; overflow-x:auto;
}
.example-box {
  background:var(--surface-2); border:1px solid var(--border);
  border-radius:var(--radius-sm); padding:18px 20px; margin:16px 0;
}
.example-box h4 { font-size:.85rem; color:var(--ink-2); margin-bottom:8px; font-weight:600; }

.faq-list { margin-top:8px; }
.faq-item { border-bottom:1px solid var(--border); }
.faq-item h3 {
  font-size:.97rem; font-weight:600; cursor:pointer;
  padding:14px 0; display:flex; justify-content:space-between; align-items:center;
  gap:10px; color:var(--ink); user-select:none;
}
.faq-item h3::after { content:'＋'; font-size:1rem; color:var(--accent); flex-shrink:0; transition:transform .2s; font-style:normal; }
.faq-item.open h3::after { transform:rotate(45deg); }
.faq-body { display:none; padding-bottom:14px; }
.faq-item.open .faq-body { display:block; }
.faq-body p { margin:0; font-size:.92rem; }
.q-mark { display:none; }

.related-grid { display:grid; grid-template-columns:repeat(auto-fill,minmax(170px,1fr)); gap:10px; margin-top:14px; margin-bottom:32px; }
.related-grid a {
  background:var(--surface); border:1px solid var(--border);
  border-radius:var(--radius-sm); padding:11px 14px;
  font-size:.85rem; color:var(--ink-2); font-weight:500;
  transition:border-color .15s, color .15s, background .15s;
}
.related-grid a:hover { border-color:var(--accent); color:var(--accent); background:var(--accent-soft); text-decoration:none; }

/* ── Sidebar ─────────────────────────────────────────────── */
.calc-sidebar { display:flex; flex-direction:column; gap:16px; }

.calc-tool {
  background:var(--surface); border:1px solid var(--border);
  border-radius:var(--radius); padding:24px;
  box-shadow:var(--shadow-sm); position:sticky; top:78px;
}
.tool-title { font-size:1.1rem; margin-bottom:4px; }
.tool-sub { font-size:.83rem; color:var(--ink-3); margin-bottom:18px; }

.field-row { display:flex; flex-direction:column; gap:5px; margin-bottom:14px; }
.field-row label { font-size:.83rem; font-weight:600; color:var(--ink); }
.field-row input, .field-row select {
  font-family:var(--font-body); font-size:.95rem; padding:10px 12px;
  border:1.5px solid var(--border); border-radius:var(--radius-sm);
  background:var(--bg); color:var(--ink); width:100%;
  transition:border-color .15s;
}
.field-row input:focus, .field-row select:focus {
  border-color:var(--accent); background:#fff; outline:none;
}
.two-col { display:grid; grid-template-columns:1fr 1fr; gap:10px; }
.calc-actions { display:flex; gap:8px; margin-top:4px; }
.calc-actions .btn { flex:1; justify-content:center; }

.error-msg { color:var(--error); font-size:.83rem; margin-top:8px; display:none; }
.error-msg.show { display:block; }

.readout {
  margin-top:18px; background:var(--ink); border-radius:var(--radius-sm);
  padding:16px; display:none; animation:fadeIn .2s ease;
}
.readout.show { display:block; }
@keyframes fadeIn { from{opacity:0;transform:translateY(4px)} to{opacity:1;transform:translateY(0)} }
.readout .r-label { font-size:.72rem; font-weight:600; letter-spacing:.06em; text-transform:uppercase; color:#64748B; margin-bottom:4px; }
.readout .r-value { font-size:1.8rem; font-weight:800; color:#38BDF8; word-break:break-word; font-family:var(--font-head); }
.readout .r-sub { font-size:.82rem; color:#94A3B8; margin-top:4px; }
.readout .r-extra { margin-top:12px; padding-top:12px; border-top:1px solid rgba(255,255,255,.1); display:flex; flex-direction:column; gap:5px; }
.readout .r-extra div { display:flex; justify-content:space-between; font-size:.8rem; color:#94A3B8; }

.sidebar-card {
  background:var(--surface); border:1px solid var(--border);
  border-radius:var(--radius); padding:18px; box-shadow:var(--shadow-xs);
}
.sidebar-card h4 { font-size:.78rem; font-weight:700; color:var(--ink-3); text-transform:uppercase; letter-spacing:.05em; margin-bottom:12px; }
.sidebar-card ul { list-style:none; display:flex; flex-direction:column; gap:6px; }
.sidebar-card li a { font-size:.875rem; color:var(--ink-2); padding:4px 0; display:block; }
.sidebar-card li a:hover { color:var(--accent); text-decoration:none; }

/* ── Ad slots ────────────────────────────────────────────── */
.ad-slot-live {
  display:block; overflow:hidden; margin:28px 0;
  min-height:100px; border-radius:var(--radius-sm);
  background:var(--surface-2);
}
.ad-slot-live.sidebar-ad { margin:0; min-height:250px; }
.ad-slot-live ins.adsbygoogle { display:block !important; }

/* ── Static pages ────────────────────────────────────────── */
.page-content { padding:50px 0 80px; max-width:72ch; margin:0 auto; }
.page-content h1 { margin-bottom:.3em; }
.page-content h2 { margin-top:1.8em; font-size:1.25rem; }
.page-content p, .page-content li { color:var(--ink-2); }

/* ── Footer ──────────────────────────────────────────────── */
.site-footer {
  background:var(--ink); color:#94A3B8;
  margin-top:80px; border-top:none;
}
.footer-grid {
  display:grid; grid-template-columns:1.6fr repeat(4,1fr);
  gap:32px; padding:52px 0 32px;
}
.footer-brand .logo { color:#fff; margin-bottom:12px; }
.footer-brand .logo .tld { color:#60A5FA; }
.footer-brand .logo-icon { background:#1E40AF; }
.footer-brand p { font-size:.85rem; color:#64748B; max-width:28ch; line-height:1.6; }
.footer-col h4 { font-size:.72rem; font-weight:700; text-transform:uppercase; letter-spacing:.07em; color:#64748B; margin-bottom:14px; }
.footer-col ul { list-style:none; display:flex; flex-direction:column; gap:9px; }
.footer-col a { color:#94A3B8; font-size:.85rem; }
.footer-col a:hover { color:#fff; text-decoration:none; }
.footer-bottom {
  border-top:1px solid #1E293B; padding:18px 0;
  display:flex; justify-content:space-between; flex-wrap:wrap; gap:8px;
  font-size:.78rem; color:#475569;
}
.footer-bottom a { color:#475569; }
.footer-bottom a:hover { color:#94A3B8; }

/* ── Mobile nav open state ───────────────────────────────── */
.main-nav.nav-open {
  display:flex; flex-direction:column;
  position:absolute; top:62px; left:0; right:0;
  background:#fff; border-bottom:1px solid var(--border);
  padding:12px 20px 16px; gap:2px; box-shadow:var(--shadow-sm);
  z-index:99;
}
.main-nav.nav-open a { padding:10px 12px; }

/* ── Responsive ──────────────────────────────────────────── */
@media (max-width:960px) {
  .calc-layout { grid-template-columns:1fr; }
  .calc-tool { position:static; order:-1; }
  .footer-grid { grid-template-columns:1fr 1fr; gap:24px; }
  .footer-brand { grid-column:1/-1; }
}
@media (max-width:640px) {
  .main-nav { display:none; }
  .nav-toggle { display:block; }
  .two-col { grid-template-columns:1fr; }
  .footer-grid { grid-template-columns:1fr 1fr; }
  .hero { padding:40px 0 32px; }
  .hero-stats { gap:20px; }
  .cat-grid { grid-template-columns:1fr; }
  .calc-intro { padding:20px; }
  .calc-tool { padding:18px; }
  .related-grid { grid-template-columns:1fr 1fr; }
  .section-head { padding-top:32px; }
}
@media (max-width:400px) {
  .related-grid { grid-template-columns:1fr; }
  .footer-grid { grid-template-columns:1fr; }
}
@media (prefers-reduced-motion:reduce) {
  *,*::before,*::after { animation:none !important; transition:none !important; }
}

/* ── SVG size guards ─────────────────────────────────────── */
.logo-icon svg { width:16px !important; height:16px !important; display:block; }
.search-wrap svg { width:18px !important; height:18px !important; flex-shrink:0; }
.nav-row svg { max-width:20px; max-height:20px; }
/* Prevent any unsized SVG from expanding */
svg:not([width]):not([style*="width"]) { max-width:100%; }