:root {
  --primary: #0038a8;
  --primary-light: #1a52c4;
  --primary-pale: #e8edf9;
  --red: #ce1126;
  --red-pale: #fdeeef;
  --gold: #fcd116;
  --gold-pale: #fffbe6;
  --green: #1a7a4a;
  --green-pale: #e8f6ee;
  --surface: #ffffff;
  --surface2: #f6f8fc;
  --border: #e1e7f0;
  --text: #1a202c;
  --text2: #4a5568;
  --text3: #718096;
  --bg: #f0f2f8;
  --shadow: 0 1px 3px rgba(0,0,0,.08);
  --shadow-md: 0 4px 14px rgba(0,0,0,.10);
  --radius: 12px;
  --radius-sm: 8px;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body { font-family: 'Inter', sans-serif; background: var(--bg); color: var(--text); font-size: 14px; line-height: 1.6; min-height: 100vh; padding-bottom: 70px; }
.site-header { background: var(--primary); padding: 0 16px; position: sticky; top: 0; z-index: 50; box-shadow: 0 2px 10px rgba(0,40,120,.3); }
.header-inner { max-width: 960px; margin: 0 auto; height: 52px; display: flex; align-items: center; justify-content: space-between; }
.logo { font-size: 19px; font-weight: 800; color: #fff; text-decoration: none; letter-spacing: -0.5px; }
.logo span { color: var(--gold); }
.header-tagline { font-size: 10.5px; color: rgba(255,255,255,.55); display:none; }
@media (min-width:480px){ .header-tagline{ display:block; } }
.ad-leaderboard { background: var(--surface); border-bottom: 1px solid var(--border); padding: 10px 16px; text-align: center; display: none; }
.ad-leaderboard .ad-label { font-size: 9px; color: var(--text3); text-transform: uppercase; letter-spacing: 1px; display: block; margin-bottom: 4px; }
@media (min-width: 768px) { .ad-leaderboard { display: block; } }
.hero { background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%); padding: 26px 16px 22px; text-align: center; color: #fff; }
.hero-flag { font-size: 26px; margin-bottom: 8px; display: block; }
.hero h1 { font-size: 21px; font-weight: 800; margin-bottom: 5px; line-height: 1.3; }
.hero p { font-size: 12.5px; opacity: .78; max-width: 460px; margin: 0 auto; }
.main-wrap { max-width: 960px; margin: 0 auto; padding: 14px 12px 40px; }
.tool-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 9px; margin-bottom: 14px; }
@media (min-width: 560px) { .tool-grid { grid-template-columns: repeat(3, 1fr); } }
@media (min-width: 860px) { .tool-grid { grid-template-columns: repeat(4, 1fr); } }
.tool-btn { background: var(--surface); border: 2px solid var(--border); border-radius: var(--radius-sm); padding: 13px 8px; text-align: center; cursor: pointer; transition: all .16s; font-family: 'Inter', sans-serif; display: flex; flex-direction: column; align-items: center; gap: 5px; text-decoration: none; }
.tool-btn:hover, .tool-btn.active { border-color: var(--primary); background: var(--primary-pale); box-shadow: var(--shadow-md); transform: translateY(-2px); }
.tool-btn .tool-icon { font-size: 21px; }
.tool-btn .tool-name { font-size: 11.5px; font-weight: 600; color: var(--text); line-height: 1.3; }
.calc-card { background: var(--surface); border-radius: var(--radius); box-shadow: var(--shadow-md); overflow: hidden; margin-bottom: 14px; }
.calc-header { background: var(--primary); padding: 13px 18px; color: #fff; display: flex; align-items: center; gap: 10px; }
.calc-header .calc-icon { font-size: 18px; }
.calc-header h2 { font-size: 14.5px; font-weight: 700; }
.calc-body { padding: 18px; }
.ad-native-wrap { display: flex; gap: 14px; align-items: flex-start; }
.ad-native-side { width: 160px; min-width: 160px; display: none; }
@media (min-width: 700px) { .ad-native-side { display: block; } }
.ad-box { background: var(--surface2); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 8px; text-align: center; }
.ad-box .ad-label { font-size: 9px; color: var(--text3); text-transform: uppercase; letter-spacing: 1px; display: block; margin-bottom: 6px; }
.ad-main { flex: 1; min-width: 0; }
.form-group { margin-bottom: 13px; }
.form-group label { display: block; font-size: 11.5px; font-weight: 700; color: var(--text2); margin-bottom: 5px; text-transform: uppercase; letter-spacing: .5px; }
.form-group input, .form-group select { width: 100%; padding: 10px 13px; border: 2px solid var(--border); border-radius: var(--radius-sm); font-size: 14px; font-family: 'Inter', sans-serif; background: var(--surface); color: var(--text); -webkit-appearance: none; }
.form-group input:focus, .form-group select:focus { outline: none; border-color: var(--primary); }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 11px; }
.btn-calc { width: 100%; padding: 12px; background: var(--primary); color: #fff; border: none; border-radius: var(--radius-sm); font-size: 15px; font-weight: 700; font-family: 'Inter', sans-serif; cursor: pointer; margin-top: 4px; }
.btn-calc:hover { background: var(--primary-light); }
.result-box { display: none; margin-top: 16px; background: var(--primary-pale); border: 2px solid var(--primary); border-radius: var(--radius-sm); padding: 16px; }
.result-box.show { display: block; }
.result-row { display: flex; justify-content: space-between; align-items: center; padding: 6px 0; border-bottom: 1px solid rgba(0,56,168,.12); font-size: 13px; }
.result-row:last-child { border-bottom: none; }
.result-label { color: var(--text2); font-weight: 500; }
.result-value { font-weight: 700; color: var(--primary); font-size: 14px; }
.result-value.red { color: var(--red); }
.result-value.green { color: var(--green); }
.result-title { font-size: 11px; font-weight: 800; color: var(--text3); text-transform: uppercase; letter-spacing: 1px; margin-bottom: 10px; }
.action-btns { display: flex; gap: 8px; margin-top: 14px; flex-wrap: wrap; }
.btn-action { flex: 1; min-width: 110px; padding: 9px 12px; border: 1.5px solid var(--border); border-radius: var(--radius-sm); background: var(--surface); font-size: 12px; font-weight: 600; font-family: 'Inter', sans-serif; cursor: pointer; color: var(--text2); text-align: center; text-decoration: none; display: inline-flex; align-items: center; justify-content: center; gap: 5px; transition: all .14s; }
.btn-action:hover { border-color: var(--primary); color: var(--primary); background: var(--primary-pale); }
.ad-social-bar { background: var(--surface2); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 10px 14px; margin-top: 13px; display: flex; align-items: center; gap: 10px; }
.ad-social-bar .ad-label { font-size: 9px; color: var(--text3); text-transform: uppercase; letter-spacing: 1px; white-space: nowrap; }
.tool-section { display: none; }
.tool-section.active { display: block; }
.info-section { background: var(--surface); border-radius: var(--radius); padding: 18px; margin-top: 12px; box-shadow: var(--shadow); }
.info-section h3 { font-size: 14px; font-weight: 700; color: var(--text); margin-bottom: 9px; padding-bottom: 8px; border-bottom: 2px solid var(--primary-pale); }
.info-section p, .info-section li { font-size: 13px; color: var(--text2); line-height: 1.7; margin-bottom: 5px; }
.info-section ul { padding-left: 18px; }
.related-tools { background: var(--gold-pale); border: 1px solid var(--gold); border-radius: var(--radius); padding: 14px 16px; margin-top: 12px; }
.related-tools h4 { font-size: 11px; font-weight: 800; color: var(--text2); text-transform: uppercase; letter-spacing: 1px; margin-bottom: 9px; }
.related-list { display: flex; flex-wrap: wrap; gap: 7px; }
.related-link { background: var(--surface); border: 1px solid var(--border); border-radius: 20px; padding: 5px 13px; font-size: 12px; font-weight: 600; color: var(--primary); cursor: pointer; transition: all .14s; text-decoration: none; }
.related-link:hover { background: var(--primary); color: #fff; border-color: var(--primary); }
.ad-sticky-mobile { position: fixed; bottom: 0; left: 0; right: 0; background: var(--surface); border-top: 2px solid var(--primary); padding: 8px 16px; text-align: center; z-index: 40; box-shadow: 0 -4px 12px rgba(0,0,0,.1); }
.ad-sticky-mobile .ad-label { font-size: 9px; color: var(--text3); text-transform: uppercase; letter-spacing: 1px; display: block; margin-bottom: 4px; }
@media (min-width: 768px) { .ad-sticky-mobile { display: none; } }
.site-footer { background: var(--text); color: rgba(255,255,255,.5); text-align: center; padding: 22px 16px; font-size: 12px; line-height: 1.8; }
.site-footer a { color: rgba(255,255,255,.65); text-decoration: none; }
.footer-links { display: flex; gap: 20px; justify-content: center; margin-bottom: 7px; }
.ph-placeholder { background:#f0f4f8; border:1px dashed #cbd5e0; display:flex; align-items:center; justify-content:center; color:#a0aec0; font-size:10px; border-radius:6px; }