:root {
  --ink: #162033;
  --muted: #667085;
  --line: #e4e9f2;
  --bg: #f6f8fc;
  --brand: #146ef5;
  --brand2: #0d57cc;
  --good: #08783e;
  --bad: #b42318;
  --warn: #8c5b00;
  --shadow: 0 12px 35px rgba(23, 35, 60, 0.08);
}
* {
  box-sizing: border-box;
}
body {
  margin: 0;
  font-family:
    Inter,
    system-ui,
    -apple-system,
    Segoe UI,
    sans-serif;
  background: var(--bg);
  color: var(--ink);
}
a {
  color: var(--brand);
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}

/* Layout */
.admin-shell {
  display: grid;
  grid-template-columns: 240px 1fr;
  min-height: 100vh;
}
.admin-side {
  background: #0f1a2c;
  color: #c6d0e0;
  padding: 24px 18px;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
}
.admin-side .brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: #fff;
  font-weight: 800;
  font-size: 17px;
  margin-bottom: 26px;
}
.admin-side .brand-mark {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: white;
  display: grid;
  place-items: center;
  font-size: 16px;
}
.admin-side nav a {
  display: flex;
  gap: 10px;
  align-items: center;
  color: #c6d0e0;
  padding: 11px 14px;
  border-radius: 10px;
  margin-bottom: 4px;
  font-weight: 600;
  font-size: 14px;
}
.admin-side nav a:hover {
  background: rgba(255, 255, 255, 0.06);
  text-decoration: none;
  color: #fff;
}
.admin-side nav a.active {
  background: var(--brand);
  color: #fff;
}
.admin-side .footer {
  margin-top: 30px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: 16px;
  font-size: 12px;
  color: #7f8ea8;
}

.admin-main {
  padding: 32px 36px 60px;
  max-width: 1100px;
}
.admin-main h1 {
  font-size: 28px;
  margin: 0 0 8px;
  letter-spacing: -0.02em;
}
.admin-main h2 {
  font-size: 19px;
  margin: 30px 0 14px;
}
.admin-main > p {
  color: var(--muted);
  margin-top: 0;
}

/* Alerts */
.alert {
  padding: 13px 16px;
  border-radius: 12px;
  margin: 16px 0;
  font-weight: 600;
  font-size: 14px;
}
.alert.success {
  background: #e7f8ee;
  color: var(--good);
}
.alert.error {
  background: #ffefed;
  color: var(--bad);
}
.alert.warn {
  background: #fff7e6;
  color: var(--warn);
}

/* Forms */
.admin-form {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 24px;
  box-shadow: var(--shadow);
  display: grid;
  gap: 16px;
  max-width: 780px;
}
.admin-form label {
  display: block;
  font-size: 13px;
  font-weight: 700;
  color: #344054;
}
.admin-form input[type='text'],
.admin-form input[type='password'],
.admin-form input[type='email'],
.admin-form input[type='number'],
.admin-form input[type='color'],
.admin-form select,
.admin-form textarea {
  width: 100%;
  margin-top: 6px;
  padding: 11px 13px;
  border: 1px solid #d0d5dd;
  border-radius: 10px;
  background: #fff;
  color: var(--ink);
  font: inherit;
  outline: none;
  transition: 0.15s;
}
.admin-form input:focus,
.admin-form select:focus,
.admin-form textarea:focus {
  border-color: var(--brand);
  box-shadow: 0 0 0 3px rgba(20, 110, 245, 0.12);
}
.admin-form textarea {
  min-height: 80px;
  resize: vertical;
  font-family: inherit;
}
.admin-form .checkbox {
  display: flex;
  align-items: center;
  gap: 9px;
  font-weight: 600;
  color: #344054;
}
.admin-form .checkbox input {
  width: auto;
  margin: 0;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  padding: 11px 18px;
  border: 0;
  border-radius: 10px;
  font-weight: 700;
  font-size: 14px;
  cursor: pointer;
  text-decoration: none;
  transition: 0.15s;
}
.btn.primary {
  background: var(--brand);
  color: #fff;
}
.btn.primary:hover {
  background: var(--brand2);
  text-decoration: none;
}
.btn.ghost {
  background: #fff;
  color: var(--ink);
  border: 1px solid var(--line);
}
.btn.ghost:hover {
  background: #f4f6fa;
  text-decoration: none;
}
.btn.danger {
  background: #ffe9e6;
  color: var(--bad);
}
.btn.danger:hover {
  background: #ffd7d2;
  text-decoration: none;
}
.btn.sm {
  padding: 7px 12px;
  font-size: 13px;
}

/* Login page */
.login-page {
  display: grid;
  place-items: center;
  min-height: 100vh;
  background:
    radial-gradient(circle at 30% 20%, #e3efff, transparent 40%), var(--bg);
}
.login-card {
  width: min(420px, 100%);
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 36px;
  box-shadow: 0 25px 70px rgba(23, 35, 60, 0.12);
}
.login-card h1 {
  margin: 0 0 6px;
  font-size: 26px;
}
.login-card p {
  color: var(--muted);
  margin: 0 0 22px;
}
.login-card .btn {
  width: 100%;
  padding: 14px;
  font-size: 15px;
}

.install-page {
  display: grid;
  place-items: center;
  min-height: 100vh;
}
.install-card {
  width: min(480px, 100%);
  background: #fff;
  padding: 36px;
  border-radius: 20px;
  box-shadow: 0 25px 70px rgba(23, 35, 60, 0.12);
}
.install-card h1 {
  font-size: 24px;
  margin: 0 0 8px;
}
.install-card code {
  background: #f1f4f9;
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 12px;
}
.install-card form {
  display: grid;
  gap: 14px;
  margin-top: 18px;
}
.install-card label {
  font-size: 13px;
  font-weight: 700;
}
.install-card input {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid #d0d5dd;
  border-radius: 10px;
  font: inherit;
  margin-top: 6px;
}

/* Table */
.admin-table {
  width: 100%;
  border-collapse: collapse;
  background: #fff;
  border-radius: 14px;
  overflow: hidden;
  box-shadow: var(--shadow);
  font-size: 14px;
}
.admin-table th {
  text-align: left;
  padding: 14px 16px;
  background: #f8fafd;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: #475569;
  border-bottom: 1px solid var(--line);
}
.admin-table td {
  padding: 14px 16px;
  border-bottom: 1px solid #eef1f7;
  vertical-align: middle;
}
.admin-table tr:last-child td {
  border-bottom: 0;
}
.admin-table code {
  background: #f1f4f9;
  padding: 3px 7px;
  border-radius: 5px;
  font-size: 12px;
}

/* Add box */
.add-box {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 0;
  margin-bottom: 22px;
  box-shadow: var(--shadow);
}
.add-box summary {
  padding: 16px 20px;
  cursor: pointer;
  font-weight: 700;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 8px;
}
.add-box summary::-webkit-details-marker {
  display: none;
}
.add-box[open] summary {
  border-bottom: 1px solid var(--line);
}
.add-box .admin-form {
  border: 0;
  box-shadow: none;
  border-radius: 0;
  max-width: none;
}

/* Code box */
.code-box {
  background: #0f1a2c;
  color: #c6d0e0;
  border-radius: 14px;
  padding: 20px;
  position: relative;
  margin: 16px 0;
}
.code-box textarea {
  width: 100%;
  background: transparent;
  color: #7ee0b8;
  border: 0;
  font-family: ui-monospace, Menlo, Consolas, monospace;
  font-size: 13px;
  resize: none;
  outline: none;
  padding: 0;
}
.code-box .btn {
  position: absolute;
  top: 14px;
  right: 14px;
  background: #4a9eff;
  color: #fff;
}

/* Cards row */
.stats-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  margin: 22px 0;
}
.stat-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 20px;
  box-shadow: var(--shadow);
}
.stat-card .k {
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--muted);
  letter-spacing: 0.05em;
}
.stat-card .v {
  font-size: 30px;
  font-weight: 800;
  margin-top: 6px;
  letter-spacing: -0.02em;
}
.stat-card .sub {
  font-size: 12px;
  color: var(--muted);
  margin-top: 4px;
}

@media (max-width: 820px) {
  .admin-shell {
    grid-template-columns: 1fr;
  }
  .admin-side {
    height: auto;
    position: static;
  }
  .admin-main {
    padding: 24px 18px;
  }
}