:root {
  --brand-violet: #8075FF;
  --brand-violet-hover: #6B60E8;
  --brand-midnight: #13111A;
  --brand-slate: #4B4453;
  --brand-border: #E0DDE6;
  --brand-bg: #F9FAFB;
  --brand-soft: #EDE9FF;
  --brand-teal: #005B63;
  --error-bg: #FFF9C4;
  --range-bg: #9AD0F5;
  --required-bg: #29B95C;
  --surface: #FFFFFF;
  --shadow: 0 18px 42px rgba(19, 17, 26, 0.06);
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--brand-bg);
  color: var(--brand-midnight);
  font-family: Inter, "Segoe UI", sans-serif;
}

a { text-decoration: none; }
code {
  font-family: "SFMono-Regular", Consolas, monospace;
  background: #F3F1F7;
  padding: 0.1rem 0.35rem;
  border-radius: 6px;
}

.shell {
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 24px 32px;
}

.topbar {
  background: var(--surface);
  border-bottom: 1px solid var(--brand-border);
  margin-bottom: 24px;
}

.topbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 20px;
  padding-bottom: 20px;
}

.eyebrow {
  margin: 0 0 6px;
  color: var(--brand-slate);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.brand-title,
.hero-card h2,
.panel-head h3,
.subpanel-head h4,
.rules-content h4 {
  margin: 0;
}

.ghost-link,
.secondary-button,
.primary-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 44px;
  border-radius: 12px;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid transparent;
}

.ghost-link,
.secondary-button {
  background: var(--surface);
  color: var(--brand-midnight);
  border-color: var(--brand-border);
  padding: 0 16px;
}

.primary-button {
  background: var(--brand-violet);
  color: #FFFFFF;
  padding: 0 18px;
}

.primary-button:hover { background: var(--brand-violet-hover); }

.hero-card,
.panel,
.subpanel,
.stat-card {
  background: var(--surface);
  border: 1px solid var(--brand-border);
  border-radius: 18px;
  box-shadow: var(--shadow);
}

.hero-card {
  padding: 28px;
  margin-bottom: 20px;
  background: linear-gradient(135deg, rgba(128,117,255,0.08), rgba(128,117,255,0.02));
}

.hero-kicker {
  margin: 0 0 8px;
  color: var(--brand-violet);
  font-weight: 700;
}

.hero-copy,
.panel-copy,
.subpanel-head p,
.rules-content li {
  color: var(--brand-slate);
  line-height: 1.6;
}

.panel,
.result-panel {
  padding: 24px;
}

.panel-head,
.subpanel-head,
.result-head {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 16px;
}

.upload-form {
  display: flex;
  flex-wrap: wrap;
  align-items: end;
  gap: 16px;
  margin-top: 18px;
}

.file-field {
  display: grid;
  gap: 8px;
  flex: 1 1 320px;
  color: var(--brand-slate);
  font-weight: 500;
}

.file-field input {
  border: 1px solid var(--brand-border);
  border-radius: 12px;
  padding: 14px 16px;
  background: #FFFFFF;
}

.result-slot {
  margin-top: 24px;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
  margin: 20px 0;
}

.stat-card {
  padding: 18px;
}

.stat-label {
  display: block;
  color: var(--brand-slate);
  margin-bottom: 10px;
  font-size: 14px;
}

.accent-number {
  color: var(--brand-violet);
  font-size: 28px;
}

.rules-details {
  display: grid;
  gap: 18px;
}

.rules-summary {
  list-style: none;
  width: fit-content;
}

.rules-summary::-webkit-details-marker {
  display: none;
}

.rules-content {
  border-top: 1px solid var(--brand-border);
  padding-top: 18px;
}

.rules-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 18px 24px;
}

.rules-content ul {
  margin: 12px 0 0;
  padding-left: 18px;
}

.subpanel {
  margin-top: 20px;
  padding: 18px;
}

.table-wrap {
  overflow: auto;
  margin-top: 16px;
  border: 1px solid var(--brand-border);
  border-radius: 14px;
}

.wide-table-wrap {
  max-height: 70vh;
}

.errors-scroll-wrap {
  max-height: calc(var(--visible-rows, 20) * 2.55rem + 3rem);
}

.result-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

.result-table th,
.result-table td {
  padding: 10px 12px;
  border-bottom: 1px solid #EEEAF3;
  text-align: left;
  vertical-align: top;
  white-space: nowrap;
}

.result-table th {
  position: sticky;
  top: 0;
  background: #FBFAFD;
  z-index: 1;
}

.letter-head {
  background: var(--brand-soft) !important;
  color: var(--brand-midnight);
  font-weight: 700;
}

.preview-table td:first-child,
.errors-table td:first-child,
.errors-table th:first-child {
  white-space: nowrap;
}

.errors-table td:last-child,
.errors-table th:last-child {
  white-space: normal;
  min-width: 420px;
}

.error-actions {
  display: flex;
  justify-content: flex-end;
  gap: 12px;
  margin-top: 16px;
  flex-wrap: wrap;
}

.cell-error {
  background: var(--error-bg);
}

.cell-range-warning {
  background: var(--range-bg);
}

.cell-required {
  background: var(--required-bg);
  color: #FFFFFF;
}

.empty-state {
  margin-top: 16px;
  padding: 18px;
  border: 1px dashed var(--brand-border);
  border-radius: 14px;
  color: var(--brand-slate);
}

.htmx-indicator { display: none; }
.htmx-request .htmx-indicator,
.htmx-request.htmx-indicator { display: inline-flex; }

@media (max-width: 860px) {
  .panel-head,
  .subpanel-head,
  .result-head,
  .topbar-inner {
    flex-direction: column;
    align-items: stretch;
  }

  .error-actions {
    justify-content: stretch;
  }

  .shell {
    padding: 0 16px 24px;
  }
}