:root {
  --bg-page: #f3f4f6;
  --bg-card: #ffffff;
  --bg-soft: #f9fafb;
  --accent: #2563eb;
  --accent-soft: #e0edff;
  --text-main: #111827;
  --text-muted: #6b7280;
  --border-subtle: #e5e7eb;
  --shadow-soft: 0 18px 45px rgba(15, 23, 42, 0.10);
  --radius-xl: 24px;
  --radius-lg: 18px;
  --radius-md: 14px;
  --radius-pill: 999px;
}

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

body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: radial-gradient(circle at top left, #e0edff 0, #f3f4f6 38%, #f9fafb 100%);
  color: var(--text-main);
  padding: 32px 16px 48px;
  line-height: 1.5;
}

@media (min-width: 900px) {
  body {
    padding: 40px 24px 64px;
  }
}

/* Page container */
.page {
  max-width: 1040px;
  margin: 0 auto;
  background: var(--bg-card);
  border-radius: var(--radius-xl);
  padding: 28px 20px 36px;
  box-shadow: var(--shadow-soft);
  border: 1px solid rgba(148, 163, 184, 0.18);
}

@media (min-width: 900px) {
  .page {
    padding: 32px 40px 40px;
  }
}

/* Navigation buttons */
.nav-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 18px;
  margin: 0 0 18px 0;
  background: #ffffff;
  color: #111827;
  border: 1px solid #e5e7eb;
  border-radius: 999px;
  font-weight: 600;
  font-size: 14px;
  text-decoration: none;
  line-height: 1;
  box-shadow: 0 12px 28px rgba(15, 23, 42, 0.08);
  transition: all 0.15s ease;
  cursor: pointer;
}

/* Hero */
.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  border-radius: var(--radius-lg);
  padding: 22px 20px 20px;
  background: linear-gradient(135deg, #eff6ff 0, #ffffff 45%, #fef3c7 100%);
  border: 1px solid #e0e7ff;
}

.hero-title {
  font-size: 20px;
  font-weight: 700;
  color: #0f172a;
  padding-bottom: 4px;
  text-align: center;
}

@media (min-width: 900px) {
  .hero-title {
    font-size: 28px;
    text-align: left;
  }
}

.hero-card-inline {
  margin-top: 14px;
  max-width: 480px;
}

.hero-card {
  width: 100%;
  border-radius: var(--radius-lg);
  background: #ffffff;
  border: 1px solid var(--border-subtle);
  box-shadow: 0 14px 30px rgba(148, 163, 184, 0.25);
  padding: 16px 16px 14px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.hero-card-title {
  font-size: 15px;
  font-weight: 600;
  color: #111827;
  margin-bottom: 6px;
}

.hero-card-text {
  font-size: 13px;
  line-height: 1.55;
  color: var(--text-muted);
}

.hero-card-footer {
  margin-top: 12px;
  height: 4px;
  border-radius: 999px;
  background: #e5e7eb;
  overflow: hidden;
}

.hero-card-progress {
  height: 100%;
  width: 80%;
  background: linear-gradient(90deg, #22c55e, #facc15);
}

/* Error banner */
.error-banner {
  background: #fef3c7;
  border: 1px solid #fbbf24;
  color: #92400e;
  padding: 12px 18px;
  border-radius: var(--radius-md);
  margin-top: 16px;
  font-size: 13px;
  line-height: 1.5;
}

/* Sections wrapper */
.sections-wrapper {
  margin-top: 32px;
  display: flex;
  flex-direction: column;
  gap: 32px;
}

/* Section headers */
.section-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
}

.export-btn {
  flex-shrink: 0;
  padding: 6px 14px;
  font-size: 13px;
  font-weight: 600;
  color: var(--accent);
  background: var(--accent-soft);
  border: 1px solid var(--accent);
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
}
.export-btn:hover {
  background: var(--accent);
  color: #fff;
}

.section-title {
  font-size: 18px;
  font-weight: 700;
  color: #0f172a;
  position: relative;
  padding-bottom: 4px;
}

.section-title::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -4px;
  width: 72px;
  height: 2px;
  border-radius: 999px;
  background: linear-gradient(to right, #2563eb, #f97316);
}

.section-line {
  flex: 1;
  height: 1px;
  background: linear-gradient(
    90deg,
    rgba(209, 213, 219, 1),
    rgba(229, 231, 235, 1),
    rgba(243, 244, 246, 1)
  );
}

/* Rate cards (CB) */
.cb-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.rate-card {
  border-radius: var(--radius-md);
  background: var(--bg-soft);
  border: 1px solid var(--border-subtle);
  box-shadow: 0 10px 24px rgba(148, 163, 184, 0.18);
  padding: 18px 20px;
  transition: transform 0.16s ease-out, box-shadow 0.16s ease-out, border-color 0.16s ease-out;
}

.rate-card:hover {
  transform: translateY(-1px);
  box-shadow: 0 16px 32px rgba(148, 163, 184, 0.28);
  border-color: #bfdbfe;
  background: #ffffff;
}

.rate-card-label {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 8px;
}

.rate-card-value {
  font-size: 28px;
  font-weight: 700;
  color: #0f172a;
  margin-bottom: 4px;
}

.rate-card-unit {
  font-size: 13px;
  color: var(--text-muted);
}

/* Banks card */
.banks-card {
  border-radius: var(--radius-md);
  background: var(--bg-soft);
  border: 1px solid var(--border-subtle);
  box-shadow: 0 10px 24px rgba(148, 163, 184, 0.18);
  padding: 20px;
}

.banks-rates {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-bottom: 16px;
}

.banks-item {
  text-align: center;
}

.banks-label {
  display: block;
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 6px;
}

.banks-value {
  display: block;
  font-size: 20px;
  font-weight: 600;
  color: var(--text-main);
}

.banks-value-accent {
  color: var(--accent);
}

.diff-section {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
  padding-top: 14px;
  border-top: 1px solid var(--border-subtle);
}

.diff-item {
  font-size: 13px;
  display: flex;
  gap: 6px;
  align-items: center;
  color: var(--text-muted);
}

.diff-value {
  font-weight: 600;
  color: var(--text-main);
}

.diff-positive {
  color: #16a34a;
}

.diff-negative {
  color: #dc2626;
}

.banks-count {
  margin-top: 10px;
  font-size: 12px;
  color: #9ca3af;
}

/* Converter */
.converter-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.converter-card {
  border-radius: var(--radius-md);
  background: var(--bg-soft);
  border: 1px solid var(--border-subtle);
  box-shadow: 0 10px 24px rgba(148, 163, 184, 0.18);
  overflow: hidden;
  transition: transform 0.16s ease-out, box-shadow 0.16s ease-out, border-color 0.16s ease-out;
}

.converter-card:hover {
  transform: translateY(-1px);
  box-shadow: 0 16px 32px rgba(148, 163, 184, 0.28);
  border-color: #bfdbfe;
}

.converter-header {
  padding: 12px 18px;
  font-weight: 600;
  font-size: 15px;
  color: #0f172a;
  background: linear-gradient(135deg, #eff6ff 0, #ffffff 100%);
  border-bottom: 1px solid var(--border-subtle);
}

.converter-body {
  padding: 18px;
}

.converter-input-group {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 14px;
}

.converter-input-group input {
  flex: 1;
  padding: 10px 14px;
  border: 1px solid var(--border-subtle);
  border-radius: 10px;
  font-size: 15px;
  outline: none;
  background: #ffffff;
  transition: border-color 0.2s, box-shadow 0.2s;
  font-family: inherit;
}

.converter-input-group input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
}

.currency-tag {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-muted);
  min-width: 36px;
}

.converter-result {
  font-size: 20px;
  font-weight: 700;
  color: #0f172a;
  margin-bottom: 12px;
}

.converter-rate-select {
  font-size: 13px;
  color: var(--text-muted);
}

.converter-rate-select select {
  padding: 6px 10px;
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  font-size: 13px;
  outline: none;
  background: #ffffff;
  font-family: inherit;
  transition: border-color 0.2s;
}

.converter-rate-select select:focus {
  border-color: var(--accent);
}

/* History */
.history-card {
  border-radius: var(--radius-md);
  background: var(--bg-soft);
  border: 1px solid var(--border-subtle);
  box-shadow: 0 10px 24px rgba(148, 163, 184, 0.18);
  padding: 18px;
}

.table-wrap {
  overflow-x: auto;
}

#history-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

#history-table th,
#history-table td {
  padding: 10px 14px;
  text-align: right;
  border-bottom: 1px solid var(--border-subtle);
}

#history-table th:first-child,
#history-table td:first-child {
  text-align: left;
}

#history-table th {
  font-weight: 600;
  color: var(--text-muted);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

#history-table tbody tr {
  transition: background 0.12s;
}

#history-table tbody tr:hover {
  background: #ffffff;
}

#history-table tbody tr:last-child td {
  border-bottom: none;
}

.loading {
  text-align: center !important;
  color: #9ca3af;
  padding: 28px !important;
  font-size: 13px;
}

/* Responsive */
@media (max-width: 640px) {
  .cb-cards,
  .converter-cards {
    grid-template-columns: 1fr;
  }

  .banks-rates {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .diff-section {
    flex-direction: column;
    gap: 8px;
  }

  .rate-card-value {
    font-size: 22px;
  }
}