:root {
  --ink: #0D0D0D;
  --purple: #5B4FFF;
  --green: #C8FF00;
  --card: #FFFFFF;
  --muted: #6F6F84;
  --line: #E8E8F2;
  --bg: #F7F7FB;
  --shadow: 0 14px 40px rgba(34,25,78,.08);
  --radius: 20px;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif, Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
}
a { color: inherit; text-decoration: none; }

.brand-lvl { color: var(--ink); }
.brand-up { color: var(--purple); }

.brand-stairs {
  width: 36px;
  height: 36px;
}

/* Base (always visible) */
.brand-stairs rect {
  fill: var(--ink); /* visible in both modes */
  opacity: .25;
  animation: stairStep 1.8s linear infinite;
  transition: fill .2s ease, opacity .2s ease;
}

/* Sequential timing */
.brand-stairs rect:nth-child(1) { animation-delay: 0s; }
.brand-stairs rect:nth-child(2) { animation-delay: .6s; }
.brand-stairs rect:nth-child(3) { animation-delay: 1.2s; }

@keyframes stairStep {
  0%, 100% {
    opacity: .25;
    transform: translateY(0);
    fill: var(--ink);
  }
  20% {
    opacity: 1;
    transform: translateY(-2px);
    fill: var(--purple);
    filter: drop-shadow(0 0 4px var(--purple));
  }
  40% {
    opacity: .25;
    transform: translateY(0);
    fill: var(--ink);
    filter: none;
  }
}

.admin-header {
  background: rgba(255,255,255,.94);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: blur(10px);
}
.admin-header__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding: 1rem 1.5rem;
}
.admin-brand {
  display: inline-flex;
  align-items: center;
  gap: .45rem;
  font-size: 1.5rem;
  font-weight: 700;
}
.admin-brand__sub {
  font-size: .9rem;
  color: var(--muted);
  margin-left: .25rem;
}
.admin-header__user {
  display: flex;
  gap: 1rem;
  align-items: center;
}
.admin-link {
  color: var(--purple);
  font-weight: 700;
}

.admin-shell {
  display: grid;
  grid-template-columns: 260px 1fr;
  min-height: calc(100vh - 72px);
}

.admin-sidebar {
  background: #fff;
  border-right: 1px solid var(--line);
  padding: 1.25rem;
}
.admin-nav {
  display: grid;
  gap: .35rem;
}
.admin-nav a {
  padding: .85rem 1rem;
  border-radius: 14px;
  color: var(--muted);
  font-weight: 700;
}
.admin-nav a:hover,
.admin-nav a:focus {
  background: rgba(91,79,255,.08);
  color: var(--purple);
}

.admin-main {
  padding: 1.5rem;
}

.admin-page-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.25rem;
}
.admin-page-head h1 {
  margin: 0;
  font-size: 2rem;
  line-height: 1.05;
}
.admin-page-head p {
  margin: .35rem 0 0;
  color: var(--muted);
}

.admin-card,
.stat-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.admin-card {
  padding: 1.25rem;
}

.admin-card__head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1rem;
}
.admin-card__head h2 {
  margin: 0;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1rem;
  margin-bottom: 1.25rem;
}
.stat-card {
  padding: 1.15rem;
}
.stat-card span {
  display: block;
  color: var(--muted);
  margin-bottom: .35rem;
}
.stat-card strong {
  font-size: 2rem;
  color: var(--purple);
}

.admin-table-wrap {
  overflow: auto;
}
.admin-table {
  width: 100%;
  border-collapse: collapse;
}
.admin-table th,
.admin-table td {
  text-align: left;
  padding: .9rem .8rem;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}
.admin-table th {
  color: var(--muted);
  font-size: .92rem;
}

.admin-form {
  display: grid;
  gap: 1rem;
}
.admin-inline-form {
  display: flex;
  gap: .75rem;
  align-items: center;
}
.admin-field {
  display: grid;
  gap: .35rem;
}
.admin-field label {
  font-weight: 700;
}
.admin-field input,
.admin-field textarea,
.admin-field select,
.admin-inline-form input {
  width: 100%;
  padding: .85rem 1rem;
  border-radius: 14px;
  border: 1px solid var(--line);
  background: #fff;
  font: inherit;
}
.admin-check {
  display: flex;
  gap: .6rem;
  align-items: center;
}

.admin-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: .85rem 1.1rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: #fff;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}
.admin-btn--primary {
  background: var(--purple);
  color: #fff;
  border-color: transparent;
}

.admin-alert {
  padding: .9rem 1rem;
  border-radius: 14px;
  margin-bottom: 1rem;
}
.admin-alert--error {
  background: #fff2f2;
  border: 1px solid #f0caca;
  color: #9a2c2c;
}

.detail-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}
.admin-detail-list {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: .65rem 1rem;
}
.admin-detail-list dt {
  font-weight: 700;
  color: var(--muted);
}
.admin-detail-list dd {
  margin: 0;
}
.admin-activity-list {
  margin: 0;
  padding-left: 1rem;
}
.admin-activity-list li + li {
  margin-top: .85rem;
}

.admin-login-body {
  min-height: 100vh;
  display: grid;
  place-items: center;
  background: linear-gradient(180deg, #fff 0%, #f6f5ff 100%);
}
.admin-login-card {
  width: min(460px, calc(100% - 2rem));
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 24px;
  box-shadow: var(--shadow);
  padding: 2rem;
}
.admin-login-brand {
  font-size: 1.7rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

@media (max-width: 980px) {
  .admin-shell {
    grid-template-columns: 1fr;
  }
  .admin-sidebar {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }
  .stats-grid,
  .detail-grid {
    grid-template-columns: 1fr;
  }
}

.admin-inline-form--tight {
  gap: .5rem;
}

.admin-inline-form--tight select,
.admin-inline-form--tight input {
  min-width: 120px;
}

.admin-role-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: .35rem .6rem;
  border-radius: 999px;
  background: rgba(91,79,255,.08);
  color: var(--purple);
  font-size: .8rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: .04em;
}

.admin-field-meta {
  font-size: .85rem;
  color: var(--muted);
  margin-top: -.15rem;
  margin-bottom: .35rem;
}