:root {
    --bg: #0F1117;
    --surface: #181B24;
    --border: #262A36;
    --text: #E6E8EE;
    --muted: #8B91A1;
    --primary: #4F8CFF;
    --primary-hover: #3b76e5;
    --success: #2FBF71;
    --warning: #F5A524;
    --danger: #F0506E;
    --font: 'Inter', system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
    --mono: 'JetBrains Mono', Consolas, Menlo, monospace;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
    background-color: var(--bg);
    color: var(--text);
    font-family: var(--font);
    font-size: 15px;
    line-height: 1.5;
    min-height: 100vh;
}

a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

/* Layout */
.layout { display: flex; min-height: 100vh; }
.sidebar {
    width: 240px;
    background: var(--surface);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    padding: 24px 16px;
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    z-index: 100;
}
.sidebar-brand {
    font-size: 20px;
    font-weight: 700;
    color: var(--text);
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 32px;
    padding-left: 12px;
}
.sidebar-brand span { color: var(--primary); }
.nav-links { display: flex; flex-direction: column; gap: 4px; flex-grow: 1; }
.nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 14px;
    border-radius: 8px;
    color: var(--muted);
    font-weight: 500;
    transition: all 0.15s;
    text-decoration: none !important;
}
.nav-item:hover { background: rgba(255, 255, 255, 0.05); color: var(--text); }
.nav-item.active { background: rgba(79, 140, 255, 0.15); color: var(--primary); }
.nav-item svg { width: 18px; height: 18px; stroke-width: 2; }

.main-content {
    margin-left: 240px;
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.topbar {
    height: 64px;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 32px;
}
.page-title { font-size: 18px; font-weight: 600; }
.user-menu { display: flex; align-items: center; gap: 16px; font-size: 14px; }
.logout-btn { color: var(--muted); padding: 6px 12px; border-radius: 6px; border: 1px solid var(--border); }
.logout-btn:hover { color: var(--danger); border-color: var(--danger); text-decoration: none; }

.container {
    max-width: 1200px;
    width: 100%;
    margin: 0 auto;
    padding: 32px;
}

/* Cards */
.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 24px;
    margin-bottom: 24px;
}
.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 18px;
}
.card-title { font-size: 16px; font-weight: 600; }

/* Grid */
.grid-4 { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; margin-bottom: 24px; }
.stat-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 20px;
}
.stat-label { font-size: 13px; color: var(--muted); margin-bottom: 6px; text-transform: uppercase; letter-spacing: 0.5px; }
.stat-val { font-size: 24px; font-weight: 700; }

/* Tables */
.table-responsive { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; text-align: left; }
th {
    padding: 12px 16px;
    font-size: 13px;
    font-weight: 600;
    color: var(--muted);
    border-bottom: 1px solid var(--border);
    text-transform: uppercase;
}
td {
    padding: 14px 16px;
    border-bottom: 1px solid var(--border);
    vertical-align: middle;
}
tr:hover td { background: rgba(255, 255, 255, 0.02); }

/* Badges */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 4px 10px;
    border-radius: 9999px;
    font-size: 12px;
    font-weight: 600;
}
.badge-success { background: rgba(47, 191, 113, 0.15); color: var(--success); }
.badge-warning { background: rgba(245, 165, 36, 0.15); color: var(--warning); }
.badge-danger { background: rgba(240, 80, 110, 0.15); color: var(--danger); }
.badge-neutral { background: rgba(139, 145, 161, 0.15); color: var(--muted); }

/* Forms & Buttons */
.form-group { margin-bottom: 16px; }
label { display: block; font-size: 13px; font-weight: 500; margin-bottom: 6px; color: var(--muted); }
input[type="text"], input[type="password"], input[type="number"], select, textarea {
    width: 100%;
    padding: 10px 14px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text);
    font-family: inherit;
    font-size: 14px;
}
input:focus, select:focus { outline: none; border-color: var(--primary); }

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 18px;
    border-radius: 8px;
    font-weight: 500;
    cursor: pointer;
    border: none;
    font-size: 14px;
    transition: background 0.15s;
    text-decoration: none !important;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-hover); }
.btn-danger { background: var(--danger); color: #fff; }
.btn-secondary { background: var(--border); color: var(--text); }
.btn-sm { padding: 6px 12px; font-size: 13px; }

/* Alerts */
.alert {
    padding: 12px 18px;
    border-radius: 8px;
    margin-bottom: 20px;
    font-size: 14px;
}
.alert-success { background: rgba(47, 191, 113, 0.15); border: 1px solid var(--success); color: var(--success); }
.alert-danger { background: rgba(240, 80, 110, 0.15); border: 1px solid var(--danger); color: var(--danger); }

/* Monospace */
.code { font-family: var(--mono); font-size: 13px; }

/* Mobile */
@media (max-width: 768px) {
    .sidebar { display: none; }
    .main-content { margin-left: 0; }
    .container { padding: 16px; }
}