:root {
  --bg: #f4f6f9;
  --surface: #ffffff;
  --text: #1c2530;
  --muted: #64707d;
  --line: #dde3ea;
  --accent: #0d6efd;
  --accent-strong: #0a58ca;
  --accent-soft: #e8f1ff;
  --danger: #b3261e;
  --danger-soft: #fdecea;
  --warning: #8a5a00;
  --warning-soft: #fff4d6;
  --ok: #0f7b3a;
  --ok-soft: #e7f6ec;
  --radius: 12px;
  --shadow: 0 1px 2px rgba(16, 24, 40, .06), 0 4px 16px rgba(16, 24, 40, .06);
  --font: "Segoe UI", system-ui, -apple-system, Roboto, Arial, sans-serif;
}

* { box-sizing: border-box; }

[hidden] { display: none !important; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.5;
  color: var(--text);
  background: var(--bg);
}

.container {
  width: min(1080px, 100% - 2rem);
  margin: 0 auto;
}

a { color: var(--accent); }

h1 { font-size: clamp(1.5rem, 3vw, 2rem); margin: 0 0 .5rem; }
h2 { font-size: 1.25rem; margin: 0 0 1rem; }

.muted { color: var(--muted); }
.lede { font-size: 1.05rem; max-width: 70ch; }

/* Header */
.site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--line);
  padding: .75rem 0;
}
.site-header .container { display: flex; align-items: center; justify-content: space-between; gap: 1rem; flex-wrap: wrap; }
.brand { display: flex; align-items: center; gap: .75rem; }
.brand-mark {
  display: inline-flex; align-items: center; justify-content: center;
  width: 44px; height: 44px; border-radius: 10px;
  background: var(--accent); color: #fff; font-weight: 700;
}
.brand-name { font-weight: 700; margin: 0; }
.brand-sub { margin: 0; color: var(--muted); font-size: .85rem; }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; gap: .4rem;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--text);
  border-radius: 8px;
  padding: .55rem 1rem;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  transition: background .15s, border-color .15s;
}
.btn:hover { border-color: var(--accent); }
.btn:focus-visible, input:focus-visible, select:focus-visible, a:focus-visible {
  outline: 3px solid rgba(13, 110, 253, .35);
  outline-offset: 2px;
}
.btn-primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-strong); }
.btn-ghost { background: transparent; }
.btn-telegram { border-color: #bcd8ff; color: var(--accent-strong); }

/* Intro */
.intro { margin: 1.5rem 0 1.25rem; }

/* Cards */
.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.25rem;
  margin: 0 0 1rem;
}
.card legend {
  font-weight: 700;
  padding: 0 .4rem;
  color: var(--accent-strong);
}
fieldset { border: 0; margin: 0; padding: 0; min-width: 0; }

.grid { display: grid; gap: 1rem; margin-top: .5rem; }
.grid > * { min-width: 0; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }

.field { display: flex; flex-direction: column; gap: .3rem; min-width: 0; }
.field label, .label-like { font-weight: 600; font-size: .95rem; }

input[type="number"], input[type="date"], select {
  font: inherit;
  padding: .6rem .7rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  color: var(--text);
  min-height: 44px;
  width: 100%;
  max-width: 100%;
}
input[type="number"]:focus, input[type="date"]:focus, select:focus { border-color: var(--accent); }
input[aria-invalid="true"] { border-color: var(--danger); }

.hint { color: var(--muted); font-size: .82rem; margin: .15rem 0 0; }

/* Rate row */
.rates-toolbar { display: flex; align-items: center; gap: .75rem; margin-bottom: .75rem; }
.rates-status { font-size: .9rem; color: var(--muted); }
.rate-row { display: flex; align-items: center; gap: .4rem; }
.rate-row input { width: 130px; }
.rate-nominal, .rate-unit { color: var(--muted); font-size: .9rem; white-space: nowrap; }
.rate-tag { display: inline-block; font-size: .78rem; padding: .1rem .4rem; border-radius: 999px; background: var(--accent-soft); color: var(--accent-strong); }
.rate-tag.manual { background: var(--warning-soft); color: var(--warning); }

/* Checkboxes and radios */
.field-check { margin-top: .6rem; }
.check-label { display: flex; gap: .55rem; align-items: flex-start; font-weight: 500; cursor: pointer; }
.check-label input { width: 18px; height: 18px; margin-top: .15rem; flex: 0 0 auto; }
.radio-label { display: flex; gap: .5rem; align-items: flex-start; font-weight: 500; margin: .2rem 0; cursor: pointer; }
.radio-label input { margin-top: .2rem; }

/* Actions */
.actions { display: flex; gap: .75rem; margin: 1rem 0 1.5rem; }

/* Errors */
.errors { margin: 0 0 1rem; }
.errors ul { margin: 0; padding-left: 1.2rem; }

/* Alerts */
.alert { border-radius: 10px; padding: .9rem 1rem; margin: 0 0 1rem; }
.alert-danger { background: var(--danger-soft); color: var(--danger); }
.alert-warning { background: var(--warning-soft); color: var(--warning); }
.alert ul { margin: .4rem 0 0; padding-left: 1.2rem; }

/* Results */
.results { margin: 1rem 0 2rem; }
.result-lines {
  margin: 0 0 1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  overflow: hidden;
}
.result-lines > div {
  display: flex; justify-content: space-between; gap: 1rem;
  padding: .75rem 1rem;
  border-bottom: 1px solid var(--line);
}
.result-lines > div:last-child { border-bottom: 0; }
.result-lines .line-label { display: flex; flex-direction: column; gap: .1rem; min-width: 0; }
.result-lines .line-amount { font-weight: 700; white-space: nowrap; text-align: right; }
.result-lines .line-amount.negative { color: var(--ok); }
.result-lines .line-source { font-size: .78rem; color: var(--muted); max-width: min(65ch, 100%); overflow-wrap: anywhere; }
.result-lines .line-formula { font-size: .78rem; color: var(--muted); }
.result-lines .line-blocked { color: var(--muted); font-weight: 500; }

.result-total {
  background: var(--accent-soft);
  border: 1px solid #bcd8ff;
  border-radius: var(--radius);
  padding: 1rem;
  font-size: 1.15rem;
  display: flex; flex-direction: column; gap: .4rem;
}
.result-total .total-row { display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap; }
.result-total .total-amount { font-weight: 800; }
.result-total .total-row.refund .total-amount { color: var(--ok); }
.result-total .total-row.net { border-top: 1px dashed #bcd8ff; padding-top: .4rem; }
.result-lines .line-amount.muted { color: var(--muted); }
code { background: var(--accent-soft); padding: .05rem .3rem; border-radius: 4px; font-size: .85em; }
.result-optional {
  margin-top: .75rem;
  border: 1px dashed var(--line);
  border-radius: var(--radius);
  padding: .9rem 1rem;
  background: var(--surface);
}
.result-meta { margin-top: 1rem; color: var(--muted); font-size: .9rem; }

/* Footer */
.site-footer {
  background: var(--surface);
  border-top: 1px solid var(--line);
  padding: 1rem 0 2rem;
  color: var(--muted);
  font-size: .9rem;
}
.site-footer p { margin: .25rem 0; }
.site-footer a { margin: 0 .25rem; }

/* Responsive */
@media (max-width: 720px) {
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
  .result-lines > div { flex-direction: column; gap: .25rem; }
  .result-lines .line-amount { text-align: left; }
  .site-header .container { flex-direction: column; align-items: flex-start; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
}

.brand-logo-icon { display:block; width:44px; height:44px; flex-shrink:0; object-fit:contain; border-radius:10px; }