:root {
  --color-bg: #f6f7fb;
  --color-surface: #ffffff;
  --color-border: #e6e8f0;
  --color-border-strong: #d8dbe7;
  --color-text: #1a1c29;
  --color-muted: #6b7089;
  --color-muted-2: #9296ab;

  --color-primary: #4f46e5;
  --color-primary-hover: #4338ca;
  --color-primary-bg: #eef0fd;
  --color-primary-ring: rgba(79, 70, 229, 0.18);

  --color-success: #0f7a4f;
  --color-success-bg: #e4f7ee;
  --color-warning: #92660a;
  --color-warning-bg: #fdf3d8;
  --color-danger: #b3261e;
  --color-danger-bg: #fbe9e8;
  --color-gray-bg: #eef0f5;
  --color-gray-text: #5b5f74;

  --sidebar-bg: #14121f;
  --sidebar-bg-active: #211d36;
  --sidebar-text: #b7b6c9;
  --sidebar-text-active: #ffffff;
  --sidebar-border: #262238;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;

  --shadow-sm: 0 1px 2px rgba(20, 18, 31, 0.06);
  --shadow-md: 0 4px 16px rgba(20, 18, 31, 0.08);
  --shadow-lg: 0 12px 32px rgba(20, 18, 31, 0.12);

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
}

* {
  box-sizing: border-box;
}

html, body {
  height: 100%;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  font-size: 14px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--color-primary);
  text-decoration: none;
}

a:hover {
  color: var(--color-primary-hover);
  text-decoration: underline;
}

code {
  font-family: var(--font-mono);
  background: var(--color-gray-bg);
  padding: 2px 6px;
  border-radius: 5px;
  font-size: 0.88em;
  color: var(--color-text);
}

h1, h2, h3 {
  font-weight: 650;
  letter-spacing: -0.01em;
}

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

.shell {
  display: flex;
  min-height: 100vh;
}

.sidebar {
  width: 232px;
  flex-shrink: 0;
  background: var(--sidebar-bg);
  color: var(--sidebar-text);
  display: flex;
  flex-direction: column;
  padding: 20px 14px;
  position: sticky;
  top: 0;
  height: 100vh;
}

.sidebar-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 6px 8px 22px;
}

.sidebar-logo {
  width: 30px;
  height: 30px;
  border-radius: 8px;
  background: #fff;
  object-fit: contain;
  flex-shrink: 0;
}

.sidebar-brand-text {
  color: #fff;
  font-weight: 700;
  font-size: 15px;
  letter-spacing: -0.01em;
}

.sidebar-nav {
  display: flex;
  flex-direction: column;
  gap: 2px;
  flex: 1;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--sidebar-text);
  padding: 9px 12px;
  border-radius: var(--radius-sm);
  font-weight: 500;
  font-size: 13.5px;
}

.nav-link svg {
  width: 17px;
  height: 17px;
  flex-shrink: 0;
  opacity: 0.85;
}

.nav-link:hover {
  background: var(--sidebar-bg-active);
  color: var(--sidebar-text-active);
  text-decoration: none;
}

.nav-link.active {
  background: var(--color-primary);
  color: #fff;
}

.nav-link.active svg {
  opacity: 1;
}

.nav-badge {
  margin-left: auto;
  background: var(--color-danger);
  color: #fff;
  font-size: 11px;
  font-weight: 700;
  line-height: 1;
  padding: 3px 7px;
  border-radius: 999px;
}

.sidebar-footer {
  border-top: 1px solid var(--sidebar-border);
  padding-top: 14px;
  margin-top: 14px;
}

.admin-email {
  color: var(--sidebar-text);
  font-size: 12px;
  padding: 0 8px 8px;
  word-break: break-all;
}

.logout-form {
  display: flex;
}

.logout-form .btn-link {
  color: var(--sidebar-text);
  padding: 8px;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  border-radius: var(--radius-sm);
}

.logout-form .btn-link:hover {
  background: var(--sidebar-bg-active);
  color: #fff;
  text-decoration: none;
}

.main {
  flex: 1;
  min-width: 0;
}

.container {
  max-width: 1120px;
  margin: 0 auto;
  padding: 36px 40px 72px;
}

/* ---------- Page header ---------- */

.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 24px;
}

h1 {
  font-size: 23px;
  margin: 0 0 22px;
  color: var(--color-text);
}

.page-header h1 {
  margin: 0;
}

h2 {
  font-size: 15px;
  margin: 0 0 14px;
  color: var(--color-text);
}

.muted {
  color: var(--color-muted);
}

.hint {
  color: var(--color-muted-2);
  font-size: 12px;
  margin: 6px 0 0;
}

/* ---------- Flash messages ---------- */

.flash {
  padding: 11px 16px;
  border-radius: var(--radius-md);
  margin-bottom: 22px;
  font-size: 13px;
  font-weight: 500;
  border: 1px solid transparent;
}

.flash-success {
  background: var(--color-success-bg);
  color: var(--color-success);
  border-color: #c9ecdb;
}

.flash-error {
  background: var(--color-danger-bg);
  color: var(--color-danger);
  border-color: #f4cfcc;
}

/* ---------- Cards ---------- */

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 22px 24px;
  margin-bottom: 20px;
  box-shadow: var(--shadow-sm);
}

.card-warning {
  border-color: #f0dfa0;
  background: var(--color-warning-bg);
}

/* ---------- Stat grid ---------- */

.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 16px;
  margin-bottom: 20px;
}

.stat-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 18px 20px;
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
}

.stat-card::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--color-primary);
  opacity: 0.55;
}

.stat-value {
  font-size: 30px;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.1;
}

.stat-label {
  color: var(--color-muted);
  font-size: 12.5px;
  margin-top: 6px;
  font-weight: 500;
}

.key-list {
  margin: 10px 0 0;
  padding-left: 20px;
}

.key-list li {
  margin-bottom: 4px;
}

/* ---------- Tables ---------- */

.table {
  width: 100%;
  border-collapse: collapse;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.table th,
.table td {
  text-align: left;
  padding: 12px 16px;
  border-bottom: 1px solid var(--color-border);
  vertical-align: top;
}

.table th {
  background: #fafafd;
  font-size: 11px;
  font-weight: 650;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-muted-2);
}

.table tbody tr {
  transition: background-color 0.1s ease;
}

.table tbody tr:hover {
  background: #fafaff;
}

.table tr:last-child td {
  border-bottom: none;
}

.table .actions {
  white-space: nowrap;
  display: flex;
  gap: 14px;
  align-items: center;
}

.empty {
  text-align: center;
  color: var(--color-muted-2);
  padding: 40px 24px;
}

/* ---------- Badges ---------- */

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 11px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 650;
  text-transform: capitalize;
}

.badge::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 999px;
  background: currentColor;
  flex-shrink: 0;
}

.badge-active {
  background: var(--color-success-bg);
  color: var(--color-success);
}

.badge-suspended {
  background: var(--color-warning-bg);
  color: var(--color-warning);
}

.badge-revoked {
  background: var(--color-danger-bg);
  color: var(--color-danger);
}

.badge-expired,
.badge-inactive {
  background: var(--color-gray-bg);
  color: var(--color-gray-text);
}

/* ---------- Forms ---------- */

.form {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 26px 28px;
  max-width: 540px;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-sm);
}

.form label {
  font-weight: 600;
  margin: 16px 0 7px;
  font-size: 13px;
  color: var(--color-text);
}

.form label:first-child {
  margin-top: 0;
}

.form input[type="text"],
.form input[type="email"],
.form input[type="password"],
.form input[type="number"],
.form input[type="date"],
.form select,
.form textarea {
  font-family: inherit;
  font-size: 14px;
  padding: 9px 12px;
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  color: var(--color-text);
  width: 100%;
  transition: border-color 0.12s ease, box-shadow 0.12s ease;
}

.form input:focus,
.form select:focus,
.form textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-ring);
}

.form textarea {
  resize: vertical;
  font-family: var(--font-mono);
  font-size: 13px;
}

.form select[multiple] {
  font-family: inherit;
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 500;
  margin-top: 16px;
}

.checkbox-label input {
  width: auto;
  accent-color: var(--color-primary);
}

.form-actions {
  display: flex;
  gap: 12px;
  margin-top: 22px;
}

.filter-form {
  display: flex;
  gap: 12px;
  margin-bottom: 18px;
}

.filter-form input[type="text"] {
  flex: 1;
  padding: 9px 12px;
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-sm);
  font-size: 14px;
  transition: border-color 0.12s ease, box-shadow 0.12s ease;
}

.filter-form input[type="text"]:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-ring);
}

.filter-form select {
  padding: 9px 12px;
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-sm);
  font-size: 14px;
  background: var(--color-surface);
}

.button-row {
  display: flex;
  gap: 12px;
  margin-bottom: 16px;
}

.inline-form {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.extend-form {
  align-items: flex-end;
}

.extend-form label {
  margin: 0;
}

/* ---------- Buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 9px 18px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  font-size: 13.5px;
  font-weight: 600;
  cursor: pointer;
  text-align: center;
  transition: background-color 0.12s ease, border-color 0.12s ease, box-shadow 0.12s ease, transform 0.05s ease;
}

.btn:active {
  transform: translateY(1px);
}

.btn-block {
  width: 100%;
}

.btn-primary {
  background: var(--color-primary);
  color: #fff;
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
  background: var(--color-primary-hover);
  text-decoration: none;
}

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

.btn-secondary:hover {
  background: var(--color-gray-bg);
  text-decoration: none;
}

.btn-success {
  background: var(--color-success);
  color: #fff;
}

.btn-success:hover {
  filter: brightness(1.08);
  text-decoration: none;
}

.btn-warning {
  background: var(--color-warning);
  color: #fff;
}

.btn-warning:hover {
  filter: brightness(1.08);
  text-decoration: none;
}

.btn-danger {
  background: var(--color-danger);
  color: #fff;
}

.btn-danger:hover {
  filter: brightness(1.08);
  text-decoration: none;
}

.btn-link {
  background: none;
  border: none;
  color: var(--color-primary);
  font-weight: 600;
  font-size: 13px;
  cursor: pointer;
  padding: 0;
}

.btn-link:hover {
  text-decoration: underline;
}

.btn-danger-link {
  color: var(--color-danger);
}

/* ---------- Detail grid ---------- */

.detail-grid {
  display: grid;
  grid-template-columns: 170px 1fr;
  row-gap: 12px;
  margin: 0;
}

.detail-grid dt {
  color: var(--color-muted);
  font-weight: 600;
  font-size: 13px;
}

.detail-grid dd {
  margin: 0;
}

/* ---------- Login page ---------- */

.login-body {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background:
    radial-gradient(circle at 15% 15%, rgba(99, 102, 241, 0.18), transparent 45%),
    radial-gradient(circle at 85% 85%, rgba(79, 70, 229, 0.14), transparent 45%),
    var(--sidebar-bg);
}

.login-card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: 36px 36px 32px;
  width: 360px;
  box-shadow: var(--shadow-lg);
}

.login-logo {
  display: block;
  width: 52px;
  height: 52px;
  border-radius: 12px;
  margin: 0 auto 18px;
  box-shadow: var(--shadow-sm);
  object-fit: contain;
}

.login-card h1 {
  font-size: 18px;
  text-align: center;
  margin: 0 0 6px;
}

.login-subtitle {
  text-align: center;
  color: var(--color-muted);
  font-size: 13px;
  margin: 0 0 22px;
}

.login-card .form {
  border: none;
  box-shadow: none;
  padding: 0;
  max-width: none;
}

/* ---------- Responsive ---------- */

@media (max-width: 860px) {
  .shell {
    flex-direction: column;
  }

  .sidebar {
    width: 100%;
    height: auto;
    position: static;
    flex-direction: row;
    align-items: center;
    padding: 12px 16px;
    overflow-x: auto;
  }

  .sidebar-brand {
    padding: 0 14px 0 0;
  }

  .sidebar-nav {
    flex-direction: row;
  }

  .sidebar-footer {
    border-top: none;
    border-left: 1px solid var(--sidebar-border);
    margin: 0 0 0 10px;
    padding: 0 0 0 14px;
  }

  .admin-email {
    display: none;
  }

  .container {
    padding: 24px 20px 48px;
  }
}