:root {
  --navy-950: #050F1C;
  --navy-900: #0A2440;
  --navy-800: #123A5E;
  --teal-600: #0E7C82;
  --teal-500: #14ADA6;
  --teal-100: #E3FAF6;
  --ice: #F5FAFA;
  --surface: #FFFFFF;
  --ink: #0E1F2C;
  --ink-muted: #4C6773;
  --border: #DDEAEA;
  --danger: #B3261E;
  --danger-bg: #FBEAE9;
  --font-body: "IBM Plex Sans", -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-mono: "IBM Plex Mono", "Courier New", monospace;
  --radius: 12px;
}
* { box-sizing: border-box; }
body {
  margin: 0; font-family: var(--font-body); background: var(--ice); color: var(--ink);
  display: flex; min-height: 100vh;
}
a { color: var(--teal-600); text-decoration: none; }
a:hover { color: var(--navy-900); }

.admin-sidebar {
  width: 240px; flex-shrink: 0; background: var(--navy-950); color: #DCE9EE;
  padding: 22px 16px; display: flex; flex-direction: column; gap: 4px;
}
.admin-sidebar .brand { display: flex; align-items: center; gap: 10px; padding: 6px 10px 22px; }
.admin-sidebar .brand img { height: 72px; width: auto; max-width: 150px; object-fit: contain; }
.admin-sidebar .brand span { font-weight: 600; color: #fff; }
.admin-nav .nav-section { padding: 14px 12px 4px; font-size: 0.68rem; font-weight: 700; letter-spacing: .12em; text-transform: uppercase; color: #5E7A85; }
.admin-nav .nav-section:first-child { padding-top: 4px; }
.admin-nav a {
  color: #A9C1CB; padding: 10px 12px; border-radius: 8px; font-size: 0.92rem; font-weight: 500;
  display: flex; align-items: center; gap: 10px;
}
.admin-nav a:hover { background: rgba(255,255,255,0.06); color: #fff; }
.admin-nav a.active { background: var(--teal-500); color: #05231F; }
.admin-nav .badge {
  margin-left: auto; background: var(--teal-500); color: #05231F; font-size: 0.72rem;
  font-weight: 700; padding: 1px 8px; border-radius: 999px;
}
.admin-nav a.active .badge { background: #05231F; color: var(--teal-500); }
.admin-sidebar .sidebar-bottom { margin-top: auto; padding-top: 16px; border-top: 1px solid rgba(255,255,255,0.1); }
.admin-sidebar .sidebar-bottom a { color: #A9C1CB; font-size: 0.85rem; padding: 8px 12px; }

.admin-main { flex: 1; min-width: 0; }
.admin-topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px 32px; background: var(--surface); border-bottom: 1px solid var(--border);
}
.admin-topbar h1 { font-size: 1.25rem; margin: 0; font-weight: 600; }
.admin-content { padding: 28px 32px 60px; }

.card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 24px; margin-bottom: 20px;
}
.card h2 { font-size: 1.05rem; margin: 0 0 16px; }

.btn {
  display: inline-flex; align-items: center; gap: 6px; padding: 10px 20px; border-radius: 999px;
  font-weight: 600; font-size: 0.9rem; border: 1.5px solid transparent; cursor: pointer;
  transition: all .15s ease; font-family: var(--font-body);
}
.btn-primary { background: var(--teal-500); color: #fff; }
.btn-primary:hover { background: var(--teal-600); color: #fff; }
.btn-outline { background: transparent; border-color: var(--border); color: var(--ink); }
.btn-outline:hover { border-color: var(--navy-800); color: var(--navy-900); }
.btn-danger { background: transparent; border-color: var(--danger); color: var(--danger); }
.btn-danger:hover { background: var(--danger-bg); }
.btn-sm { padding: 6px 14px; font-size: 0.82rem; }

label { display: block; font-size: 0.82rem; font-weight: 600; color: var(--navy-800); margin-bottom: 6px; }
input, select, textarea {
  width: 100%; padding: 10px 13px; border: 1.5px solid var(--border); border-radius: 8px;
  font-family: var(--font-body); font-size: 0.92rem; color: var(--ink); background: var(--surface);
  margin-bottom: 16px;
}
input:focus, select:focus, textarea:focus { outline: none; border-color: var(--teal-500); box-shadow: 0 0 0 3px var(--teal-100); }
textarea { resize: vertical; min-height: 90px; }
.field-hint { font-size: 0.78rem; color: var(--ink-muted); margin-top: -12px; margin-bottom: 16px; }

table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 12px 14px; border-bottom: 1px solid var(--border); font-size: 0.9rem; vertical-align: top; }
th { font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: .05em; text-transform: uppercase; color: var(--ink-muted); }
tr.is-unread td { font-weight: 600; }
tr:hover td { background: #FAFEFE; }

.pill { display: inline-block; padding: 3px 10px; border-radius: 999px; font-size: 0.72rem; font-weight: 600; }
.pill-teal { background: var(--teal-100); color: var(--teal-600); }
.pill-muted { background: #EEF3F3; color: var(--ink-muted); }

.alert { padding: 12px 16px; border-radius: 8px; margin-bottom: 20px; font-size: 0.9rem; }
.alert-success { background: #E4F6F0; color: #0B5E45; border: 1px solid #B7E7D6; }
.alert-error { background: #FBEAE9; color: #8A231C; border: 1px solid #F2C6C2; }

.toast {
  position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%);
  padding: 12px 22px; border-radius: 999px; font-size: 0.86rem; font-weight: 600;
  box-shadow: 0 10px 30px rgba(5,15,28,.25); z-index: 9999; transition: opacity .4s ease;
  max-width: 480px; text-align: center;
}
.toast-success { background: #0B5E45; color: #fff; }
.toast-error { background: #8A231C; color: #fff; }

.stat-cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 16px; margin-bottom: 24px; }
.stat-cards .card { margin-bottom: 0; position: relative; overflow: hidden; transition: border-color .2s ease; }
.stat-cards .card::before { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px; background: var(--teal-500); transform: scaleX(0); transform-origin: left; transition: transform .25s ease; }
.stat-cards .card:hover { border-color: var(--teal-500); }
.stat-cards .card:hover::before { transform: scaleX(1); }
.stat-cards .num { font-size: 2rem; font-weight: 700; color: var(--navy-900); }
.stat-cards .label { font-size: 0.72rem; font-weight: 600; letter-spacing: .08em; text-transform: uppercase; color: var(--ink-muted); margin-top: 4px; }

.login-wrap {
  min-height: 100vh; width: 100%; display: flex; align-items: center; justify-content: center;
  background: linear-gradient(160deg, var(--navy-950), var(--navy-900));
}
.login-card { background: var(--surface); border-radius: 16px; padding: 40px; width: 100%; max-width: 380px; box-shadow: 0 24px 60px rgba(0,0,0,0.3); }
.login-card .brand { display: flex; align-items: center; gap: 10px; margin-bottom: 26px; }
.login-card .brand img { height: 90px; width: auto; max-width: 190px; object-fit: contain; }
.login-card .brand span { font-weight: 700; font-size: 1.1rem; color: var(--navy-900); }

.section-tabs { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 22px; }
.section-tabs a {
  padding: 8px 16px; border-radius: 999px; font-size: 0.86rem; font-weight: 600;
  background: var(--surface); border: 1px solid var(--border); color: var(--ink-muted);
}
.section-tabs a.active { background: var(--navy-900); border-color: var(--navy-900); color: #fff; }

.img-preview { width: 90px; height: 60px; object-fit: cover; border-radius: 8px; border: 1px solid var(--border); background: var(--teal-100); }

@media (max-width: 860px) {
  body { flex-direction: column; }
  .admin-sidebar { width: 100%; flex-direction: row; overflow-x: auto; }
  .admin-nav { display: flex; gap: 4px; }
  .sidebar-bottom { display: none; }
}