:root {
  --bg: #0f1117;
  --surface: #1a1d27;
  --surface2: #22263a;
  --border: #2e3350;
  --accent: #6c63ff;
  --accent2: #00d2ff;
  --text: #e8eaf6;
  --muted: #8892b0;
  --success: #00c49a;
  --font-display: 'Plus Jakarta Sans', sans-serif;
  --font-body: 'Inter', sans-serif;
  --radius: 12px;
  --radius-sm: 8px;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body { background: var(--bg); color: var(--text); font-family: var(--font-body); font-size: 16px; line-height: 1.6; min-height: 100vh; }
a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent2); }
nav { background: rgba(15,17,23,0.92); backdrop-filter: blur(12px); border-bottom: 1px solid var(--border); padding: 0 24px; height: 60px; display: flex; align-items: center; justify-content: space-between; position: sticky; top: 0; z-index: 100; }
.nav-logo { font-family: var(--font-display); font-size: 20px; font-weight: 700; background: linear-gradient(135deg, var(--accent), var(--accent2)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.nav-links { display: flex; gap: 24px; list-style: none; }
.nav-links a { color: var(--muted); font-size: 14px; transition: color .2s; }
.nav-links a:hover { color: var(--text); }
.hero { text-align: center; padding: 80px 24px 60px; max-width: 800px; margin: 0 auto; }
.hero-badge { display: inline-block; background: rgba(108,99,255,0.15); border: 1px solid rgba(108,99,255,0.3); color: var(--accent2); font-size: 12px; font-weight: 600; letter-spacing: 1px; text-transform: uppercase; padding: 6px 16px; border-radius: 20px; margin-bottom: 24px; }
.hero h1 { font-family: var(--font-display); font-size: clamp(32px, 5vw, 52px); font-weight: 800; line-height: 1.15; margin-bottom: 20px; }
.hero h1 span { background: linear-gradient(135deg, var(--accent), var(--accent2)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.hero p { color: var(--muted); font-size: 18px; max-width: 560px; margin: 0 auto 40px; }
.search-wrap { max-width: 560px; margin: 0 auto 60px; position: relative; }
.search-wrap input { width: 100%; background: var(--surface); border: 1px solid var(--border); border-radius: 50px; padding: 16px 56px 16px 24px; color: var(--text); font-size: 16px; font-family: var(--font-body); outline: none; transition: border-color .2s, box-shadow .2s; }
.search-wrap input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(108,99,255,0.15); }
.search-wrap input::placeholder { color: var(--muted); }
.search-icon { position: absolute; right: 20px; top: 50%; transform: translateY(-50%); color: var(--muted); pointer-events: none; }
.categories { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; margin-bottom: 48px; padding: 0 24px; }
.cat-btn { background: var(--surface); border: 1px solid var(--border); color: var(--muted); padding: 8px 18px; border-radius: 50px; font-size: 13px; font-weight: 500; cursor: pointer; transition: all .2s; font-family: var(--font-body); }
.cat-btn:hover, .cat-btn.active { background: var(--accent); border-color: var(--accent); color: #fff; }
.grid-section { max-width: 1200px; margin: 0 auto; padding: 0 24px 80px; }
.section-label { font-size: 11px; letter-spacing: 2px; text-transform: uppercase; color: var(--muted); margin-bottom: 20px; font-weight: 600; }
.calc-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 16px; }
.calc-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; transition: all .25s; cursor: pointer; position: relative; overflow: hidden; text-decoration: none; display: block; color: inherit; }
.calc-card::before { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 2px; background: linear-gradient(90deg, var(--accent), var(--accent2)); opacity: 0; transition: opacity .25s; }
.calc-card:hover { border-color: var(--accent); transform: translateY(-2px); box-shadow: 0 8px 32px rgba(108,99,255,0.15); color: inherit; }
.calc-card:hover::before { opacity: 1; }
.card-icon { width: 44px; height: 44px; border-radius: var(--radius-sm); display: flex; align-items: center; justify-content: center; font-size: 22px; margin-bottom: 16px; background: var(--surface2); }
.calc-card h3 { font-size: 15px; font-weight: 600; margin-bottom: 6px; font-family: var(--font-display); }
.calc-card p { font-size: 13px; color: var(--muted); line-height: 1.5; }
.calc-page { max-width: 800px; margin: 0 auto; padding: 40px 24px 80px; }
.breadcrumb { font-size: 13px; color: var(--muted); margin-bottom: 32px; }
.breadcrumb a { color: var(--muted); }
.breadcrumb a:hover { color: var(--accent); }
.breadcrumb span { margin: 0 8px; }
.calc-page h1 { font-family: var(--font-display); font-size: clamp(24px, 4vw, 36px); font-weight: 700; margin-bottom: 8px; }
.calc-page .subtitle { color: var(--muted); font-size: 16px; margin-bottom: 36px; }
.calc-box { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 32px; margin-bottom: 32px; }
.form-group { margin-bottom: 20px; }
.form-group label { display: block; font-size: 13px; font-weight: 600; color: var(--muted); margin-bottom: 8px; text-transform: uppercase; letter-spacing: 0.5px; }
.form-group input, .form-group select { width: 100%; background: var(--surface2); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 12px 16px; color: var(--text); font-size: 16px; font-family: var(--font-body); outline: none; transition: border-color .2s; }
.form-group input:focus, .form-group select:focus { border-color: var(--accent); }
.form-group select option { background: var(--surface2); }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.btn-calc { width: 100%; background: linear-gradient(135deg, var(--accent), #5b52ff); border: none; border-radius: var(--radius-sm); padding: 16px; color: #fff; font-size: 16px; font-weight: 600; font-family: var(--font-body); cursor: pointer; transition: all .2s; margin-top: 8px; }
.btn-calc:hover { transform: translateY(-1px); box-shadow: 0 6px 24px rgba(108,99,255,0.4); }
.result-box { background: linear-gradient(135deg, rgba(108,99,255,0.1), rgba(0,210,255,0.08)); border: 1px solid rgba(108,99,255,0.3); border-radius: var(--radius); padding: 28px 32px; margin-top: 24px; display: none; }
.result-box.show { display: block; }
.result-main { font-size: 42px; font-weight: 800; font-family: var(--font-display); background: linear-gradient(135deg, var(--accent), var(--accent2)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; margin-bottom: 4px; }
.result-label { font-size: 13px; color: var(--muted); text-transform: uppercase; letter-spacing: 1px; margin-bottom: 20px; }
.result-breakdown { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 12px; margin-top: 20px; padding-top: 20px; border-top: 1px solid var(--border); }
.result-item { background: var(--surface2); border-radius: var(--radius-sm); padding: 14px; }
.result-item-val { font-size: 20px; font-weight: 700; color: var(--text); font-family: var(--font-display); }
.result-item-label { font-size: 11px; color: var(--muted); text-transform: uppercase; letter-spacing: 0.5px; margin-top: 2px; }
.tabs { display: flex; gap: 4px; background: var(--surface2); border-radius: var(--radius-sm); padding: 4px; margin-bottom: 24px; }
.tab-btn { flex: 1; background: none; border: none; color: var(--muted); padding: 10px; border-radius: 6px; font-size: 14px; font-weight: 500; cursor: pointer; transition: all .2s; font-family: var(--font-body); }
.tab-btn.active { background: var(--surface); color: var(--text); box-shadow: 0 1px 4px rgba(0,0,0,0.3); }
.info-box { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 28px 32px; margin-bottom: 24px; }
.info-box h2 { font-family: var(--font-display); font-size: 20px; font-weight: 600; margin-bottom: 12px; }
.info-box p { color: var(--muted); font-size: 15px; line-height: 1.7; margin-bottom: 12px; }
.info-box ul { color: var(--muted); font-size: 15px; padding-left: 20px; line-height: 1.8; }
.related-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 12px; margin-top: 16px; }
.related-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 16px; display: flex; align-items: center; gap: 12px; text-decoration: none; color: var(--text); transition: all .2s; font-size: 14px; font-weight: 500; }
.related-card:hover { border-color: var(--accent); color: var(--text); }
footer { background: var(--surface); border-top: 1px solid var(--border); padding: 40px 24px; text-align: center; }
.footer-logo { font-family: var(--font-display); font-size: 18px; font-weight: 700; background: linear-gradient(135deg, var(--accent), var(--accent2)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; margin-bottom: 12px; }
.footer-links { display: flex; gap: 24px; justify-content: center; flex-wrap: wrap; margin-bottom: 16px; }
.footer-links a { color: var(--muted); font-size: 13px; transition: color .2s; }
.footer-links a:hover { color: var(--text); }
.footer-copy { color: var(--muted); font-size: 12px; }
.ad-slot { background: var(--surface2); border: 1px dashed var(--border); border-radius: var(--radius-sm); padding: 20px; text-align: center; color: var(--muted); font-size: 12px; margin: 24px 0; min-height: 90px; display: flex; align-items: center; justify-content: center; }
@media (max-width: 640px) { .form-row { grid-template-columns: 1fr; } .calc-box { padding: 20px; } .result-box { padding: 20px; } .nav-links { display: none; } .hero { padding: 48px 24px 40px; } }