:root {
  --kb-red-950: #350404;
  --kb-red-900: #650707;
  --kb-red-800: #8f0000;
  --kb-red-700: #b80000;
  --kb-red-600: #d40000;
  --kb-red-050: #fff7f7;
  --kb-ink: #171717;
  --kb-muted: #5d6370;
  --kb-card: rgba(255, 255, 255, 0.94);
  --kb-line: rgba(184, 0, 0, 0.16);
  --kb-radius: 8px;
  --kb-shadow: 0 18px 46px rgba(42, 8, 8, 0.14);
  --kb-shadow-lg: 0 30px 80px rgba(42, 8, 8, 0.22);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  min-height: 100vh;
  color: var(--kb-ink);
  background:
    linear-gradient(90deg, rgba(184, 0, 0, 0.04) 1px, transparent 1px),
    linear-gradient(180deg, rgba(184, 0, 0, 0.035) 1px, transparent 1px),
    linear-gradient(135deg, #ffffff 0%, #fff7f7 52%, #ffffff 100%);
  background-size: 44px 44px, 44px 44px, auto;
  font-family: Arial, Helvetica, sans-serif;
  line-height: 1.6;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px clamp(18px, 4vw, 48px);
  background: linear-gradient(135deg, var(--kb-red-950), var(--kb-red-700));
  color: #fff;
  box-shadow: var(--kb-shadow);
  backdrop-filter: blur(14px);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
  font-size: clamp(17px, 2.4vw, 24px);
  font-weight: 900;
  line-height: 1.15;
}

.brand img {
  width: 54px;
  height: 54px;
  flex: 0 0 54px;
  border: 2px solid #fff;
  border-radius: 50%;
  object-fit: cover;
  background: #fff;
}

.topbar a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 9px 12px;
  border-radius: var(--kb-radius);
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
  font-weight: 800;
  transition: background 0.2s ease, transform 0.2s ease;
}

.topbar a:hover {
  background: rgba(255, 255, 255, 0.18);
  transform: translateY(-1px);
}

.kabya-page {
  width: min(1180px, calc(100% - 28px));
  margin: 0 auto;
  padding: clamp(34px, 6vw, 72px) 0;
}

.kabya-hero {
  padding: clamp(30px, 6vw, 62px);
  border-radius: var(--kb-radius);
  color: #fff;
  background:
    linear-gradient(135deg, rgba(53, 4, 4, 0.97), rgba(184, 0, 0, 0.88)),
    radial-gradient(circle at 84% 12%, rgba(255, 255, 255, 0.2), transparent 32%);
  box-shadow: var(--kb-shadow-lg);
}

.kicker {
  display: inline-flex;
  margin-bottom: 14px;
  padding: 7px 11px;
  border: 1px solid rgba(255, 255, 255, 0.26);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.12);
  color: #ffe2e2;
  font-size: 13px;
  font-weight: 900;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.kabya-hero h1 {
  max-width: 820px;
  margin-bottom: 14px;
  font-size: clamp(34px, 7vw, 68px);
  line-height: 1.02;
  letter-spacing: 0;
}

.kabya-hero p:not(.kicker) {
  max-width: 740px;
  color: rgba(255, 255, 255, 0.9);
  font-size: clamp(16px, 2.2vw, 20px);
}

.fee-panel {
  display: grid;
  gap: 22px;
  margin-top: clamp(22px, 4vw, 34px);
  padding: clamp(18px, 4vw, 32px);
  border: 1px solid var(--kb-line);
  border-radius: var(--kb-radius);
  background: var(--kb-card);
  box-shadow: var(--kb-shadow-lg);
}

.panel-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
}

.panel-header h2,
.sheet-card h2 {
  color: var(--kb-red-800);
  font-size: clamp(22px, 4vw, 32px);
  line-height: 1.12;
}

.panel-header p {
  color: var(--kb-muted);
}

.sheet-status {
  min-width: min(100%, 260px);
  padding: 11px 13px;
  border: 1px solid rgba(184, 0, 0, 0.14);
  border-left: 4px solid var(--kb-red-700);
  border-radius: var(--kb-radius);
  background: var(--kb-red-050);
  color: var(--kb-muted);
  font-size: 14px;
  font-weight: 800;
}

.sheet-status.success {
  border-left-color: #1f7a3a;
  background: #f1fff5;
  color: #1f6b34;
}

.sheet-status.error {
  border-left-color: #c62828;
  background: #fff1f1;
  color: #9d1717;
}

.fee-controls {
  display: grid;
  grid-template-columns: minmax(0, 420px);
  gap: 16px;
}

.field-group {
  display: grid;
  gap: 8px;
}

.field-group label {
  color: var(--kb-ink);
  font-size: 14px;
  font-weight: 900;
}

select {
  width: 100%;
  min-height: 48px;
  padding: 12px 14px;
  border: 1px solid rgba(184, 0, 0, 0.2);
  border-radius: var(--kb-radius);
  background: #fff;
  color: var(--kb-ink);
  cursor: pointer;
  font: inherit;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

select:focus {
  outline: none;
  border-color: var(--kb-red-700);
  box-shadow: 0 0 0 4px rgba(184, 0, 0, 0.1);
}

select:disabled {
  cursor: not-allowed;
  opacity: 0.68;
  background: #f2f2f2;
}

.amount-card {
  padding: clamp(16px, 3vw, 24px);
  border: 1px solid rgba(184, 0, 0, 0.22);
  border-radius: var(--kb-radius);
  background:
    linear-gradient(135deg, rgba(184, 0, 0, 0.08), rgba(255, 255, 255, 0.95));
  box-shadow: var(--kb-shadow);
}

.amount-card[hidden] {
  display: none !important;
}

.amount-card p {
  color: var(--kb-muted);
  font-weight: 800;
}

.amount-card strong {
  display: block;
  margin-top: 10px;
  color: var(--kb-red-700);
  font-size: clamp(34px, 8vw, 54px);
  line-height: 1;
}

.pay-button {
  width: 100%;
  min-height: 50px;
  margin-top: 18px;
  padding: 14px 18px;
  border: 0;
  border-radius: var(--kb-radius);
  color: #fff;
  background: linear-gradient(135deg, var(--kb-red-900), var(--kb-red-600));
  box-shadow: 0 14px 28px rgba(184, 0, 0, 0.24);
  cursor: pointer;
  font: inherit;
  font-weight: 900;
  transition: transform 0.22s ease, box-shadow 0.22s ease, filter 0.22s ease;
}

.pay-button:hover {
  transform: translateY(-2px);
  filter: saturate(1.08);
  box-shadow: 0 18px 36px rgba(184, 0, 0, 0.3);
}

.pay-button[hidden] {
  display: none !important;
}

.sheet-card {
  display: grid;
  gap: 14px;
  padding: clamp(16px, 3vw, 24px);
  border: 1px solid var(--kb-line);
  border-radius: var(--kb-radius);
  background: #fff;
  box-shadow: 0 8px 22px rgba(42, 8, 8, 0.08);
}

.sheet-table-container {
  width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border-radius: var(--kb-radius);
}

.fee-table {
  width: 100%;
  min-width: 460px;
  border-collapse: collapse;
  overflow: hidden;
  border-radius: var(--kb-radius);
}

.fee-table th,
.fee-table td {
  padding: 13px 14px;
  text-align: left;
  border-bottom: 1px solid rgba(184, 0, 0, 0.12);
}

.fee-table thead {
  color: #fff;
  background: linear-gradient(135deg, var(--kb-red-900), var(--kb-red-600));
}

.fee-table th {
  font-size: 13px;
  font-weight: 900;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.fee-table tbody tr:hover {
  background: var(--kb-red-050);
}

.error-message {
  padding: 14px;
  border-left: 4px solid #c62828;
  border-radius: var(--kb-radius);
  background: #fff1f1;
  color: #9d1717;
  font-weight: 800;
}

@media (max-width: 760px) {
  .topbar,
  .panel-header {
    align-items: stretch;
    flex-direction: column;
  }

  .topbar a {
    justify-content: center;
  }

  .fee-controls {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 460px) {
  .kabya-page {
    width: min(100% - 18px, 1180px);
  }

  .brand img {
    width: 44px;
    height: 44px;
    flex-basis: 44px;
  }
}