@import url('https://fonts.googleapis.com/css2?family=Source+Serif+4:wght@500;600;700&family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  --bg: #eef1f6;
  --surface: #ffffff;
  --surface-alt: #f5f7fb;
  --border: #d7dce6;
  --border-strong: #b9c2d2;
  --text: #1b2436;
  --text-muted: #5b6472;
  --accent: #14335c;
  --accent-soft: #2a5386;
  --seal: #93712f;
  --success: #2f7d52;
  --danger: #a83f3f;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: 'Inter', system-ui, sans-serif;
  font-size: 14px;
}

button, input, select, textarea {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
}

.hidden { display: none !important; }
.mono { font-family: 'JetBrains Mono', ui-monospace, monospace; }

.serif {
  font-family: 'Source Serif 4', Georgia, serif;
}

/* ---------------------------------------------------------------- gate -- */

.gate {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background:
    linear-gradient(var(--bg), var(--bg)),
    repeating-linear-gradient(0deg, transparent 0 39px, rgba(20,51,92,0.035) 39px 40px);
}

.gate-card {
  width: 100%;
  max-width: 380px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-top: 3px solid var(--accent);
  border-radius: 4px;
  padding: 32px 30px 28px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  box-shadow: 0 1px 2px rgba(20, 30, 50, 0.04);
}

.gate-seal {
  color: var(--seal);
  align-self: center;
  margin-bottom: 2px;
}

.gate-mark {
  margin: 0;
  color: var(--text-muted);
  font-size: 11.5px;
  letter-spacing: 0.03em;
  text-align: center;
  text-transform: uppercase;
}

.gate-card h1 {
  margin: 0;
  font-family: 'Source Serif 4', Georgia, serif;
  font-size: 24px;
  font-weight: 600;
  text-align: center;
  color: var(--accent);
}

.gate-sub {
  margin: -6px 0 6px;
  text-align: center;
  font-size: 12px;
  color: var(--text-muted);
}

.gate-card label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 12px;
  color: var(--text-muted);
  font-weight: 500;
}

.gate-card input {
  background: var(--surface-alt);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 9px 10px;
  color: var(--text);
}

.gate-card input:focus {
  outline: 2px solid var(--accent-soft);
  outline-offset: 1px;
}

.gate-note {
  margin: 4px 0 0;
  font-size: 11px;
  color: var(--text-muted);
  line-height: 1.4;
  text-align: center;
}

/* -------------------------------------------------------------- shell -- */

.app-shell {
  display: grid;
  grid-template-columns: 232px 1fr;
  grid-template-rows: 64px 1fr;
  grid-template-areas:
    "top top"
    "rail main";
  min-height: 100vh;
}

.topbar {
  grid-area: top;
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 0 22px;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}

.topbar-brand {
  display: flex;
  align-items: center;
  gap: 9px;
}

.topbar-seal { color: var(--seal); flex-shrink: 0; }

.topbar-mark {
  font-family: 'Source Serif 4', Georgia, serif;
  font-weight: 600;
  font-size: 16px;
  color: var(--accent);
}

.topbar-app {
  font-size: 12px;
  color: var(--text-muted);
  padding-left: 9px;
  border-left: 1px solid var(--border);
}

.topbar-stats {
  flex: 1;
  display: flex;
  gap: 20px;
  font-size: 12.5px;
  color: var(--text-muted);
  justify-content: center;
}

.topbar-stats b { color: var(--accent); font-weight: 600; }

/* --------------------------------------------------------------- rail -- */

.rail {
  grid-area: rail;
  border-right: 1px solid var(--border);
  background: var(--surface-alt);
  padding: 20px 16px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.rail-generate { width: 100%; }

.rail-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.rail-group label {
  font-size: 11px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.02em;
}

.rail-group input,
.rail-group select {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 7px 9px;
}

/* --------------------------------------------------------------- main -- */

.main {
  grid-area: main;
  padding: 22px 24px;
  overflow-x: auto;
}

.serial-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
  overflow: hidden;
}

.serial-table th {
  text-align: left;
  font-weight: 600;
  color: var(--text-muted);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  padding: 11px 12px;
  border-bottom: 2px solid var(--border-strong);
  background: var(--surface-alt);
  white-space: nowrap;
}

.serial-table td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
  font-size: 13px;
}

.serial-table tbody tr:nth-child(even) {
  background: var(--surface-alt);
}

.serial-table tbody tr:hover {
  background: #eaf0f8;
}

.code-cell {
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  letter-spacing: 0.02em;
  color: var(--accent);
}

.badge {
  display: inline-block;
  padding: 2px 9px;
  border-radius: 3px;
  font-size: 11px;
  font-weight: 600;
  border: 1px solid transparent;
  letter-spacing: 0.01em;
}

.badge-unused    { color: var(--text-muted); border-color: var(--border-strong); background: var(--surface-alt); }
.badge-activated { color: var(--success); border-color: var(--success); background: #eaf5ef; }
.badge-revoked   { color: var(--danger); border-color: var(--danger); background: #f8ebeb; }

.row-actions {
  display: flex;
  gap: 6px;
}

.pagination {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 4px;
  color: var(--text-muted);
  font-size: 12.5px;
}

/* ------------------------------------------------------------ buttons -- */

.btn-primary, .btn-secondary, .btn-ghost, .btn-icon {
  border-radius: 4px;
  padding: 8px 15px;
  border: 1px solid transparent;
  cursor: pointer;
  font-weight: 600;
  font-size: 13px;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}
.btn-primary:hover { background: var(--accent-soft); }

.btn-secondary {
  background: var(--surface);
  border-color: var(--border-strong);
  color: var(--accent);
}
.btn-secondary:hover { border-color: var(--accent); }

.btn-ghost {
  background: transparent;
  color: var(--text-muted);
  font-weight: 500;
}
.btn-ghost:hover { color: var(--accent); }

.btn-icon {
  background: transparent;
  color: var(--text-muted);
  padding: 4px 8px;
  font-size: 12px;
  font-weight: 500;
}
.btn-icon:hover { color: var(--accent); }
.btn-icon.danger:hover { color: var(--danger); }

button:focus-visible, input:focus-visible, select:focus-visible {
  outline: 2px solid var(--accent-soft);
  outline-offset: 1px;
}

/* ------------------------------------------------------------- panel -- */

.overlay {
  position: fixed;
  inset: 0;
  background: rgba(20, 30, 50, 0.35);
  display: flex;
  justify-content: flex-end;
  z-index: 10;
}

.panel {
  width: 100%;
  max-width: 430px;
  background: var(--surface);
  border-left: 1px solid var(--border);
  border-top: 3px solid var(--accent);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  overflow-y: auto;
}

.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border);
}

.panel-head h2 {
  margin: 0;
  font-family: 'Source Serif 4', Georgia, serif;
  font-size: 18px;
  font-weight: 600;
  color: var(--accent);
}

.panel label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 11px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.02em;
}

.panel input {
  background: var(--surface-alt);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 8px 10px;
  color: var(--text);
  text-transform: none;
  font-weight: 400;
}

.panel-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.generate-result {
  border-top: 1px solid var(--border);
  padding-top: 14px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.generate-result p {
  font-size: 12.5px;
  color: var(--text-muted);
  margin: 0;
}

.generate-result textarea {
  background: var(--surface-alt);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 10px;
  color: var(--text);
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 12.5px;
  resize: vertical;
}

@media (max-width: 720px) {
  .app-shell {
    grid-template-columns: 1fr;
    grid-template-areas:
      "top"
      "main";
  }
  .rail { display: none; }
}