:root {
  color-scheme: light dark;
  --bg: #f4f5f7;
  --fg: #14161a;
  --muted: #6b7280;
  --card: #ffffff;
  --border: #e5e7eb;
  --accent: #4f46e5;
  --accent-fg: #ffffff;
  --accent-soft: #eef2ff;
  --danger: #dc2626;
  --danger-soft: #fee2e2;
  --success: #16a34a;
  --success-soft: #dcfce7;
  --warning: #d97706;
  --warning-soft: #fef3c7;
  --shadow: 0 1px 2px rgba(16, 24, 40, .04), 0 1px 3px rgba(16, 24, 40, .06);
  --shadow-md: 0 4px 12px rgba(16, 24, 40, .08);
  --radius: 12px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
  background: var(--bg);
  color: var(--fg);
  -webkit-font-smoothing: antialiased;
}

/* ---------- App shell / sidebar ---------- */
.app-shell { display: flex; min-height: 100vh; align-items: stretch; }

.sidebar {
  width: 250px;
  flex-shrink: 0;
  background: var(--card);
  border-right: 1px solid var(--border);
  padding: 20px 16px;
  display: flex;
  flex-direction: column;
  gap: 22px;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
}

.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--fg); padding: 0 4px; }
.brand-logo { height: 32px; width: auto; border-radius: 6px; display: block; }
.brand-mark {
  display: inline-flex; align-items: center; justify-content: center;
  width: 32px; height: 32px; border-radius: 8px;
  background: var(--accent); color: #fff; font-weight: 700; font-size: 0.95em;
}
.brand-text { font-weight: 700; font-size: 1em; letter-spacing: -0.01em; }

.sidebar-nav { display: flex; flex-direction: column; gap: 3px; }
.sidebar-nav a {
  text-decoration: none;
  color: var(--muted);
  font-weight: 500;
  font-size: 0.9em;
  padding: 9px 12px;
  border-radius: 8px;
  transition: background .15s, color .15s;
}
.sidebar-nav a:hover { background: var(--bg); color: var(--fg); }
.sidebar-nav a.active { background: var(--accent-soft); color: var(--accent); }

.server-monitor {
  margin-top: auto;
  padding-top: 16px;
  border-top: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.server-monitor h3 { margin: 0; font-size: 0.7em; text-transform: uppercase; letter-spacing: .05em; color: var(--muted); font-weight: 700; }
.meter { display: flex; flex-direction: column; gap: 4px; }
.meter-label { display: flex; justify-content: space-between; font-size: 0.78em; color: var(--muted); font-weight: 500; }
.meter-bar { background: var(--bg); border: 1px solid var(--border); border-radius: 6px; height: 6px; overflow: hidden; }
.meter-fill { height: 100%; background: var(--accent); transition: width .4s; }
.meter-fill.meter-warn { background: var(--warning); }
.meter-fill.meter-crit { background: var(--danger); }
.meter-hint { margin: 0; font-size: 0.72em; color: var(--muted); }

.logout-form { display: flex; align-items: center; justify-content: space-between; gap: 10px; margin: 0; padding-top: 4px; }
.logout-form .user { color: var(--muted); font-size: 0.85em; font-weight: 500; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.logout-form button {
  background: transparent; border: 1px solid var(--border); color: var(--muted);
  padding: 6px 14px; border-radius: 8px; font-size: 0.85em; cursor: pointer;
  transition: all .15s;
  flex-shrink: 0;
}
.logout-form button:hover { border-color: var(--danger); color: var(--danger); }

.container { max-width: 1040px; margin: 0 auto; padding: 32px 24px 64px; flex: 1; min-width: 0; }

h1 { font-size: 1.5em; font-weight: 700; letter-spacing: -0.01em; margin: 0 0 20px; }
h2 { font-size: 1.1em; font-weight: 600; margin-top: 36px; }

/* ---------- Login ---------- */
body:has(.login-box) {
  background: #ffffff;
  --bg: #ffffff;
  --card: #ffffff;
  --fg: #14161a;
  --muted: #6b7280;
  --border: #e5e7eb;
  min-height: 100vh;
}
.login-box {
  max-width: 380px;
  margin: 8vh auto 0;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
  padding: 36px;
}
.login-logo { display: block; max-height: 120px; width: auto; margin: 0 auto 24px; }
.login-box h1 { text-align: center; margin-bottom: 24px; color: var(--fg); }
.login-box form { display: flex; flex-direction: column; gap: 16px; }
.login-box label { display: flex; flex-direction: column; gap: 6px; font-size: 0.88em; color: var(--muted); font-weight: 500; }
.checkbox-label { flex-direction: row !important; align-items: center; gap: 8px !important; cursor: pointer; }
.checkbox-label input[type=checkbox] { width: 16px; height: 16px; accent-color: var(--accent); cursor: pointer; }

input[type=text], input[type=password] {
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 0.95em;
  font-family: inherit;
  background: var(--bg);
  color: var(--fg);
  transition: border-color .15s, box-shadow .15s;
}
input[type=text]:focus, input[type=password]:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
  background: var(--card);
}

button, .btn {
  cursor: pointer;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--fg);
  padding: 7px 14px;
  border-radius: 8px;
  font-size: 0.88em;
  font-weight: 500;
  font-family: inherit;
  text-decoration: none;
  display: inline-block;
  transition: all .15s;
}
.btn:hover { border-color: var(--accent); color: var(--accent); }
button[type=submit] { background: var(--accent); color: var(--accent-fg); border-color: var(--accent); }
button[type=submit]:hover { filter: brightness(1.08); color: var(--accent-fg); }
.btn-danger { color: var(--danger); border-color: var(--border); background: transparent; }
.btn-danger:hover { background: var(--danger-soft); border-color: var(--danger); }
.btn-upload { background: var(--success); color: #fff; border-color: var(--success); }
.btn-upload:hover { filter: brightness(1.08); color: #fff; }

/* ---------- Breadcrumbs ---------- */
.breadcrumbs { margin-bottom: 18px; color: var(--muted); font-size: 0.92em; }
.breadcrumbs a { color: var(--muted); text-decoration: none; font-weight: 500; }
.breadcrumbs a:hover { color: var(--accent); }

/* ---------- Client detail tabs / forms ---------- */
.tab-bar { display: flex; gap: 4px; margin-bottom: 22px; border-bottom: 1px solid var(--border); flex-wrap: wrap; }
.tab-bar a {
  padding: 9px 14px;
  text-decoration: none;
  color: var(--muted);
  font-weight: 500;
  font-size: 0.9em;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  transition: color .15s, border-color .15s;
}
.tab-bar a:hover { color: var(--fg); }
.tab-bar a.active { color: var(--accent); border-bottom-color: var(--accent); }

.data-form {
  display: flex;
  flex-direction: column;
  gap: 14px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 22px;
  max-width: 640px;
  margin-bottom: 16px;
}
.data-form label { display: flex; flex-direction: column; gap: 6px; font-size: 0.88em; color: var(--muted); font-weight: 500; }
.data-form input, .data-form textarea, .data-form select {
  padding: 9px 11px; border: 1px solid var(--border); border-radius: 8px;
  font-size: 0.95em; font-family: inherit; background: var(--bg); color: var(--fg);
}
.data-form input:focus, .data-form textarea:focus, .data-form select:focus {
  outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); background: var(--card);
}
.data-form textarea { resize: vertical; }
.form-row { display: flex; gap: 14px; flex-wrap: wrap; }
.form-row label { flex: 1; min-width: 160px; }

/* ---------- Cards / tables ---------- */
.upload-form {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 14px 16px;
  margin-bottom: 18px;
}
.upload-form input[type=file] { flex: 1; font-size: 0.85em; color: var(--muted); }

.file-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}
.file-table th, .file-table td { padding: 12px 16px; border-bottom: 1px solid var(--border); text-align: left; font-size: 0.9em; }
.file-table tbody tr:last-child td { border-bottom: none; }
.file-table tbody tr:hover { background: var(--bg); }
.file-table th { color: var(--muted); font-weight: 600; font-size: 0.78em; text-transform: uppercase; letter-spacing: 0.04em; background: var(--bg); }
.file-table th a { color: var(--muted); text-decoration: none; }
.file-table th a:hover { color: var(--accent); }
.file-table a { color: var(--fg); text-decoration: none; font-weight: 500; }
.file-table a:hover { color: var(--accent); }
.actions { display: flex; gap: 8px; align-items: center; }
.inline-form { margin: 0; display: inline; }

/* ---------- Stats banner (dashboard) ---------- */
.stats-banner {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 14px;
  margin-bottom: 24px;
}
.stat-card {
  display: flex;
  align-items: center;
  gap: 14px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 18px 20px;
}
.stat-card-alert { border-color: var(--warning); background: var(--warning-soft); }
.stat-icon { font-size: 1.7em; line-height: 1; }
.stat-card div { display: flex; flex-direction: column; }
.stat-value { font-size: 1.35em; font-weight: 700; letter-spacing: -0.01em; }
.stat-label { font-size: 0.78em; color: var(--muted); font-weight: 500; }

/* ---------- Client cards (dashboard) ---------- */
.client-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 14px;
}
.client-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: box-shadow .15s, transform .15s, border-color .15s;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}
.client-card:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); border-color: var(--accent); }
.client-card-main { text-decoration: none; color: var(--fg); padding: 18px; display: flex; flex-direction: column; gap: 10px; flex: 1; }
.client-card-header { display: flex; align-items: flex-start; justify-content: space-between; gap: 8px; }
.client-card-name { font-weight: 600; font-size: 1.02em; }
.client-card-stats { display: flex; flex-direction: column; gap: 4px; font-size: 0.82em; color: var(--muted); }
.client-card-stats strong { color: var(--fg); font-weight: 600; }
.client-card-backups-link {
  display: block;
  text-align: center;
  padding: 9px 12px;
  font-size: 0.82em;
  font-weight: 500;
  text-decoration: none;
  color: var(--muted);
  background: var(--bg);
  border-top: 1px solid var(--border);
  transition: background .15s, color .15s;
}
.client-card-backups-link:hover { background: var(--accent-soft); color: var(--accent); }

/* ---------- Badges / flashes ---------- */
.badge {
  display: inline-block;
  padding: 2px 9px;
  border-radius: 999px;
  font-size: 0.72em;
  font-weight: 600;
  vertical-align: middle;
}
.badge-stale { background: var(--warning-soft); color: var(--warning); }
.badge-empty { background: var(--border); color: var(--muted); font-weight: 500; }

.flashes { margin-bottom: 18px; display: flex; flex-direction: column; gap: 8px; }
.flash { padding: 11px 15px; border-radius: 9px; font-size: 0.9em; font-weight: 500; }
.flash-error { background: var(--danger-soft); color: #991b1b; }
.flash-success { background: var(--success-soft); color: #166534; }
.flash-warning { background: var(--warning-soft); color: #92400e; }

/* ---------- Disk usage ---------- */
.disk-summary { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); padding: 20px; margin-bottom: 20px; }
.disk-bar { background: var(--bg); border-radius: 8px; overflow: hidden; height: 16px; border: 1px solid var(--border); }
.disk-bar-fill { background: linear-gradient(90deg, var(--accent), #7c3aed); height: 100%; transition: width .3s; }
.hint { color: var(--muted); font-size: 0.85em; }

/* ---------- Search / activity ---------- */
.search-form { display: flex; gap: 10px; margin-bottom: 22px; }
.search-form input[type=text] { flex: 1; padding: 10px 12px; border: 1px solid var(--border); border-radius: 8px; font-size: 0.95em; background: var(--card); }

.activity-log {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 18px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.82em;
  overflow-x: auto;
  white-space: pre;
  max-height: 70vh;
  overflow-y: auto;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #101115;
    --fg: #e9eaee;
    --card: #1a1c22;
    --border: #2b2e37;
    --accent-soft: #1e2247;
    --danger-soft: #3f1d1d;
    --success-soft: #123822;
    --warning-soft: #3a2a0d;
  }
  .flash-error { color: #fca5a5; }
  .flash-success { color: #86efac; }
  .flash-warning { color: #fcd34d; }
}

@media (max-width: 768px) {
  .app-shell { flex-direction: column; }
  .sidebar {
    position: static;
    width: 100%;
    height: auto;
    flex-direction: row;
    flex-wrap: wrap;
    align-items: center;
    gap: 14px;
    padding: 12px 16px;
  }
  .sidebar-nav { flex-direction: row; flex-wrap: wrap; order: 3; width: 100%; }
  .server-monitor { display: none; }
  .logout-form { margin-left: auto; padding-top: 0; }
  .container { padding: 20px 14px 48px; }
  .file-table th:nth-child(3), .file-table td:nth-child(3) { display: none; }
}