:root{--bg:#f7f8fa;--surface:#ffffff;--text:#1c2333;--muted:#5c6577;--border:#e3e6ec;--accent:#2563eb;--accent-dark:#1d4ed8;--kofi:#13c0ff;--result-bg:#eefbf2;--result-border:#34d399;--error:#dc2626;--radius:10px}*{box-sizing:border-box}body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--text);line-height:1.6}a{color:var(--accent)}.page-wrap{max-width:860px;margin:0 auto;padding:0 16px;min-height:100vh;display:flex;flex-direction:column}.page-main{flex:1 1}.site-header{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:8px;padding:14px 0;border-bottom:1px solid var(--border);margin-bottom:24px}.site-logo{font-weight:700;font-size:18px;text-decoration:none;color:var(--text)}.lang-switcher{display:flex;flex-wrap:wrap;gap:4px}.lang-link{padding:4px 8px;border-radius:6px;font-size:12px;font-weight:600;text-decoration:none;color:var(--muted)}.lang-link:hover{background:var(--border)}.lang-link.active{background:var(--accent);color:#fff}.visually-hidden{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}.hero h1{font-size:30px;margin:0 0 8px}.hero-intro{color:var(--muted);margin:0 0 24px}.category-section h2{font-size:20px;margin:28px 0 12px}.calc-grid{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));grid-gap:10px;gap:10px}.calc-card{display:block;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:12px 14px;text-decoration:none;color:var(--text);font-weight:500;transition:border-color .15s,box-shadow .15s}.calc-card:hover{border-color:var(--accent);box-shadow:0 2px 8px rgba(37,99,235,.12)}.calc-page h1{font-size:28px;margin:0 0 16px}.calculator-form{background:var(--surface);border:1px solid 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