:root {
  --bg: #0d131a;
  --panel: #141c26;
  --line: #243041;
  --text: #e8eef4;
  --muted: #8b9aab;
  --accent: #2ad4c4;
  --danger: #ff6b6b;
  --sidebar: #0a1017;
  --font: "Noto Sans SC", system-ui, sans-serif;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}
a { color: inherit; text-decoration: none; }
h1, h2, h3 { margin: 0 0 0.6rem; }

.admin-shell {
  display: grid;
  grid-template-columns: 230px 1fr;
  min-height: 100vh;
}

.admin-sidebar {
  background: var(--sidebar);
  border-right: 1px solid var(--line);
  padding: 1.4rem 0;
  display: flex;
  flex-direction: column;
}

.admin-logo {
  padding: 0 1.2rem 1.4rem;
  border-bottom: 1px solid var(--line);
  margin-bottom: 1rem;
}

.admin-logo strong { display: block; }
.admin-logo small { color: var(--accent); font-size: 0.75rem; letter-spacing: 0.1em; }

.admin-nav a {
  display: block;
  padding: 0.7rem 1.2rem;
  color: var(--muted);
  border-left: 3px solid transparent;
}

.admin-nav a:hover,
.admin-nav a.active {
  color: var(--text);
  background: rgba(42, 212, 196, 0.06);
  border-left-color: var(--accent);
}

.admin-main { padding: 1.5rem 1.8rem 2.5rem; }
.admin-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
  gap: 1rem;
}

.admin-top h1 { font-size: 1.45rem; margin: 0; }
.muted { color: var(--muted); }

.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.stat-card {
  background: var(--panel);
  border: 1px solid var(--line);
  padding: 1.1rem 1.2rem;
}

.stat-card strong {
  display: block;
  font-size: 1.8rem;
  color: var(--accent);
}

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  padding: 1.2rem;
  margin-bottom: 1.2rem;
}

.table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
}

.table th,
.table td {
  text-align: left;
  padding: 0.75rem 0.6rem;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

.table th { color: var(--muted); font-weight: 500; }

.btn {
  display: inline-flex;
  align-items: center;
  padding: 0.45rem 0.85rem;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--text);
  font: inherit;
  cursor: pointer;
  border-radius: 3px;
}

.btn-primary {
  background: linear-gradient(120deg, #1ec9b8, #2a9fd8);
  border-color: transparent;
  color: #041018;
  font-weight: 600;
}

.btn-danger { border-color: var(--danger); color: var(--danger); }
.btn-sm { padding: 0.25rem 0.55rem; font-size: 0.82rem; }
.actions { display: flex; gap: 0.4rem; flex-wrap: wrap; }

.flash {
  padding: 0.7rem 1rem;
  margin-bottom: 1rem;
  border: 1px solid var(--line);
}
.flash-success { color: var(--accent); border-color: var(--accent); }
.flash-error { color: var(--danger); border-color: var(--danger); }

.admin-form .form-row { margin-bottom: 1rem; }
.admin-form label {
  display: block;
  margin-bottom: 0.3rem;
  color: var(--muted);
  font-size: 0.88rem;
}
.admin-form input,
.admin-form select,
.admin-form textarea {
  width: 100%;
  padding: 0.65rem 0.8rem;
  background: #0b121a;
  border: 1px solid var(--line);
  color: var(--text);
  font: inherit;
  border-radius: 3px;
}
.admin-form .check {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text);
}
.admin-form .check input { width: auto; }
.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}
.thumb {
  max-width: 160px;
  margin-top: 0.5rem;
  border: 1px solid var(--line);
}
.badge {
  display: inline-block;
  padding: 0.1rem 0.45rem;
  font-size: 0.75rem;
  border: 1px solid var(--line);
  color: var(--muted);
}
.badge-on { color: var(--accent); border-color: var(--accent); }
.badge-off { color: var(--danger); border-color: var(--danger); }

.login-page {
  min-height: 100vh;
  display: grid;
  place-items: center;
  background:
    radial-gradient(ellipse at 30% 20%, rgba(42, 212, 196, 0.12), transparent 45%),
    var(--bg);
}

.login-card {
  width: min(100% - 2rem, 400px);
  background: var(--panel);
  border: 1px solid var(--line);
  padding: 2rem 1.6rem;
}

.login-card h1 {
  font-size: 1.3rem;
  margin-bottom: 0.3rem;
}

@media (max-width: 900px) {
  .admin-shell { grid-template-columns: 1fr; }
  .admin-sidebar {
    border-right: none;
    border-bottom: 1px solid var(--line);
    padding: 0.8rem 0 0;
  }
  .admin-logo {
    padding: 0 1rem 0.8rem;
    margin-bottom: 0.4rem;
  }
  .admin-nav {
    display: flex;
    flex-wrap: nowrap;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    padding: 0 0.5rem 0.2rem;
  }
  .admin-nav::-webkit-scrollbar { display: none; }
  .admin-nav a {
    flex: 0 0 auto;
    border-left: none;
    border-bottom: 2px solid transparent;
    white-space: nowrap;
    padding: 0.7rem 0.85rem;
    min-height: 44px;
  }
  .admin-nav a.active {
    border-bottom-color: var(--accent);
    background: transparent;
  }
  .admin-main { padding: 1rem 1rem 2rem; }
  .admin-top {
    flex-direction: column;
    align-items: stretch;
  }
  .admin-top .btn { width: 100%; justify-content: center; min-height: 44px; }
  .stats, .form-grid { grid-template-columns: 1fr 1fr; }
  .panel { overflow-x: auto; -webkit-overflow-scrolling: touch; }
  .table { min-width: 560px; }
  .admin-form input,
  .admin-form select,
  .admin-form textarea {
    font-size: 16px;
    min-height: 44px;
  }
}

@media (max-width: 600px) {
  .stats, .form-grid { grid-template-columns: 1fr; }
  .login-card { padding: 1.5rem 1.2rem; }
}