:root {
    --bg: #0f1117;
    --surface: #1a1d27;
    --surface-hover: #22252f;
    --border: #2a2d3a;
    --text: #e4e6eb;
    --text-muted: #8b8fa3;
    --primary: #4f6ef7;
    --primary-hover: #3d5bd9;
    --success: #22c55e;
    --warning: #f59e0b;
    --danger: #ef4444;
    --radius: 8px;
    --sidebar-w: 240px;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.5;
}

/* --- Layout --- */
.app-container {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: var(--sidebar-w);
    background: var(--surface);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    position: fixed;
    height: 100vh;
    overflow-y: auto;
}

.sidebar-header {
    padding: 24px 20px 16px;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: baseline;
    gap: 8px;
}

.logo {
    font-size: 20px;
    font-weight: 700;
    color: var(--primary);
}

.version {
    font-size: 11px;
    color: var(--text-muted);
}

.nav-menu {
    list-style: none;
    padding: 12px 8px;
    flex: 1;
}

.nav-item a {
    display: block;
    padding: 10px 16px;
    color: var(--text-muted);
    text-decoration: none;
    border-radius: var(--radius);
    font-size: 14px;
    transition: all 0.15s;
}

.nav-item a:hover {
    background: var(--surface-hover);
    color: var(--text);
}

.nav-item.active a {
    background: var(--primary);
    color: #fff;
}

.sidebar-footer {
    padding: 16px 20px;
    border-top: 1px solid var(--border);
}

.logout-link {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 13px;
}

.logout-link:hover { color: var(--danger); }

.content {
    flex: 1;
    margin-left: var(--sidebar-w);
    padding: 32px;
}

.content-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 32px;
}

.content-header h2 {
    font-size: 24px;
    font-weight: 600;
}

.date { color: var(--text-muted); font-size: 14px; }

/* --- Cards --- */
.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 20px;
}

.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
}

.card h3 {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 8px;
}

.card-value {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 4px;
}

.card-sub {
    font-size: 12px;
    color: var(--text-muted);
}

/* --- Login --- */
.login-body {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
}

.login-container { width: 100%; max-width: 400px; padding: 20px; }

.login-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 40px 32px;
    text-align: center;
}

.login-logo {
    font-size: 28px;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 4px;
}

.login-sub {
    color: var(--text-muted);
    font-size: 14px;
    margin-bottom: 32px;
}

/* --- Forms --- */
.form-group {
    margin-bottom: 20px;
    text-align: left;
}

.form-group label {
    display: block;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-muted);
    margin-bottom: 6px;
}

.form-group input {
    width: 100%;
    padding: 10px 14px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text);
    font-size: 14px;
    outline: none;
    transition: border-color 0.15s;
}

.form-group input:focus {
    border-color: var(--primary);
}

.btn {
    display: inline-block;
    padding: 10px 20px;
    border: none;
    border-radius: var(--radius);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.15s;
}

.btn-primary {
    background: var(--primary);
    color: #fff;
}

.btn-primary:hover { background: var(--primary-hover); }

.btn-full { width: 100%; }

.alert {
    padding: 12px 16px;
    border-radius: var(--radius);
    font-size: 13px;
    margin-bottom: 20px;
    text-align: left;
}

.alert-error {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: var(--danger);
}