:root {
  --bg: #F8F4EC;
  --surface: #FFFFFF;
  --surface-soft: #FFFDFC;
  --section: #F3EFE6;
  --green: #315C4D;
  --green-dark: #244339;
  --green-light: #3F6F5E;
  --text: #252A27;
  --muted: #68736D;
  --border: #E3DACB;
  --honey: #D99A2B;
  --warning-bg: #FFF5DF;
  --error-bg: #FFF1EE;
  --error: #C95A4A;
  --shadow: 0 18px 50px rgba(49, 92, 77, 0.10);
  --radius: 24px;
  --radius-sm: 14px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text);
  background: radial-gradient(circle at top left, rgba(217, 154, 43, 0.12), transparent 34rem), var(--bg);
  line-height: 1.55;
}
a { color: inherit; }

.site-header {
  max-width: 1160px;
  margin: 0 auto;
  padding: 22px 22px 12px;
  display: flex;
  justify-content: space-between;
  gap: 18px;
  align-items: center;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  min-width: 0;
}
.brand-logo { width: 172px; height: auto; display: block; }
.brand-divider { width: 1px; height: 28px; background: var(--border); }
.brand-tool { color: var(--muted); font-size: 15px; white-space: nowrap; }
.top-nav { display: flex; gap: 16px; align-items: center; flex-wrap: wrap; justify-content: flex-end; }
.top-nav a { text-decoration: none; color: var(--muted); font-size: 15px; }
.top-nav a:hover { color: var(--green); }

.section { max-width: 1160px; margin: 0 auto; padding: 42px 22px; }
.hero { display: grid; grid-template-columns: minmax(0, 1.35fr) minmax(280px, 0.65fr); gap: 28px; align-items: stretch; padding-top: 58px; }
.hero-copy, .trust-card, .calc-card, .result-panel, .info-card, .medvedo-link, .legal-card {
  background: rgba(255,255,255,0.82);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.hero-copy { padding: 42px; }
.eyebrow { margin: 0 0 10px; color: var(--honey); font-size: 14px; font-weight: 700; text-transform: uppercase; letter-spacing: .08em; }
h1, h2 { margin: 0; line-height: 1.12; color: var(--text); }
h1 { font-size: clamp(34px, 5vw, 58px); max-width: 820px; }
h2 { font-size: clamp(24px, 3vw, 34px); }
.lead { font-size: 20px; color: var(--muted); max-width: 760px; margin: 22px 0 0; }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 28px; }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 12px 20px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-weight: 700;
  font-size: 15px;
  text-decoration: none;
  cursor: pointer;
  font-family: inherit;
}
.btn-primary { background: var(--green); color: #fff; }
.btn-primary:hover { background: var(--green-dark); }
.btn-secondary { background: #fff; color: var(--green); border-color: var(--border); }
.btn-secondary:hover { border-color: var(--green-light); }
.btn-wide { width: 100%; }
.trust-card { padding: 32px; display: flex; flex-direction: column; justify-content: center; }
.trust-icon { width: 46px; height: 46px; border-radius: 50%; background: rgba(217,154,43,.16); color: var(--honey); display: grid; place-items: center; font-weight: 900; font-size: 22px; margin-bottom: 18px; }
.trust-card p { color: var(--muted); margin: 12px 0 0; }

.grid-section { display: grid; grid-template-columns: minmax(320px, 0.95fr) minmax(320px, 1.05fr); gap: 24px; align-items: start; }
.calc-card, .result-panel { padding: 28px; }
.calc-header p:not(.eyebrow) { color: var(--muted); margin: 12px 0 0; }
.form-group { margin-top: 20px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.field-label { display: block; font-weight: 750; margin-bottom: 8px; color: var(--text); }
.field-hint { color: var(--muted); font-size: 13px; margin: 7px 0 0; }
input, select {
  width: 100%;
  min-height: 48px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: #fff;
  color: var(--text);
  padding: 10px 14px;
  font-size: 16px;
  font-family: inherit;
}
input:focus, select:focus { outline: 3px solid rgba(63, 111, 94, .18); border-color: var(--green-light); }
.mode-switch { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; background: var(--section); padding: 6px; border-radius: 999px; }
.mode-btn { border: 0; background: transparent; border-radius: 999px; min-height: 42px; color: var(--muted); font-weight: 700; cursor: pointer; font-family: inherit; }
.mode-btn.active { background: #fff; color: var(--green); box-shadow: 0 6px 18px rgba(49, 92, 77, 0.10); }
.fraction-input { display: grid; grid-template-columns: 1fr auto 1fr; gap: 10px; align-items: center; }
.fraction-divider { color: var(--muted); font-size: 26px; }
.hidden { display: none; }

.result-panel { position: sticky; top: 18px; }
.result-placeholder { min-height: 300px; display: flex; flex-direction: column; justify-content: center; color: var(--muted); }
.result-placeholder h2 { color: var(--text); }
.result-card { background: var(--surface-soft); border: 1px solid var(--border); border-radius: 20px; padding: 24px; }
.result-meta { display: flex; gap: 10px; flex-wrap: wrap; margin: 16px 0 4px; }
.result-meta span { background: var(--section); border-radius: 999px; padding: 7px 11px; color: var(--muted); font-size: 14px; }
.result-list { margin: 18px 0 20px; border-top: 1px solid var(--border); }
.result-row { display: flex; justify-content: space-between; gap: 16px; padding: 14px 0; border-bottom: 1px solid var(--border); align-items: baseline; }
.result-row span { color: var(--muted); }
.result-row strong { color: var(--green); text-align: right; }
.result-row small { color: var(--muted); font-weight: 600; }
.alert { border-radius: 18px; padding: 16px 18px; margin-top: 14px; border: 1px solid var(--border); }
.alert p { margin: 6px 0 0; color: var(--muted); }
.alert-error { background: var(--error-bg); border-color: rgba(201, 90, 74, .28); color: var(--error); }
.alert-warning { background: var(--warning-bg); border-color: rgba(217, 154, 43, .32); }
.alert-note { background: #F7FAF6; border-color: rgba(63, 111, 94, .20); }

.info-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.info-card { padding: 26px; }
.info-card p { color: var(--muted); margin: 12px 0 0; }
.how { display: grid; grid-template-columns: .8fr 1.2fr; gap: 24px; align-items: start; }
.steps { display: grid; gap: 12px; }
.step { display: grid; grid-template-columns: 42px 1fr; gap: 12px; background: rgba(255,255,255,.82); border: 1px solid var(--border); border-radius: 18px; padding: 14px; }
.step span { width: 42px; height: 42px; border-radius: 50%; background: rgba(217,154,43,.16); color: var(--honey); display: grid; place-items: center; font-weight: 900; }
.step p { margin: 0; color: var(--muted); }
.medvedo-link { padding: 30px; display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.medvedo-link p:not(.eyebrow) { color: var(--muted); margin: 12px 0 0; }

.legal-page { max-width: 920px; }
.legal-card { padding: 42px; }
.legal-card h2 { font-size: 24px; margin-top: 30px; }
.legal-card p { color: var(--muted); }
.legal-actions { margin-top: 28px; }

.site-footer { max-width: 1160px; margin: 20px auto 0; padding: 28px 22px 42px; color: var(--muted); display: grid; grid-template-columns: 1fr auto; gap: 18px; align-items: start; border-top: 1px solid var(--border); }
.site-footer p { margin: 4px 0 0; }
.footer-links { display: flex; gap: 12px; flex-wrap: wrap; justify-content: flex-end; }
.footer-links a { color: var(--muted); text-decoration: none; }
.footer-links a:hover { color: var(--green); }
.copy { grid-column: 1 / -1; font-size: 13px; }

@media (max-width: 860px) {
  .site-header, .hero, .grid-section, .how, .medvedo-link, .site-footer { grid-template-columns: 1fr; }
  .site-header { align-items: flex-start; }
  .top-nav, .footer-links { justify-content: flex-start; }
  .hero { padding-top: 28px; }
  .hero-copy, .legal-card { padding: 28px; }
  .result-panel { position: static; }
  .info-cards { grid-template-columns: 1fr; }
}
@media (max-width: 560px) {
  .section { padding: 28px 16px; }
  .site-header { padding: 18px 16px 6px; }
  .brand { align-items: flex-start; flex-direction: column; gap: 8px; }
  .brand-divider { display: none; }
  .brand-logo { width: 158px; }
  .hero-copy, .trust-card, .calc-card, .result-panel, .legal-card { border-radius: 20px; padding: 22px; }
  .form-row, .mode-switch { grid-template-columns: 1fr; border-radius: 18px; }
  .result-row { flex-direction: column; gap: 4px; }
  .result-row strong { text-align: left; }
}