:root {
    --primary: #1e3a5f;
    --primary-light: #2d5a8f;
    --accent: #0ea5e9;
    --bg: #f1f5f9;
    --card: #ffffff;
    --text: #0f172a;
    --muted: #64748b;
    --border: #e2e8f0;
    --danger: #dc2626;
    --ok: #16a34a;
    --sidebar-w: 240px;
    --topbar-h: 56px;
}

* { box-sizing: border-box; margin: 0; }
body {
    font-family: "Segoe UI", system-ui, Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
}

/* ---------- Login ---------- */
.login-body {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    padding: 16px;
}
.login-card {
    background: var(--card);
    padding: 36px 32px;
    border-radius: 14px;
    width: 100%;
    max-width: 380px;
    box-shadow: 0 20px 50px rgba(0,0,0,.3);
    text-align: center;
}
.login-logo { font-size: 44px; }
.login-card h1 { font-size: 20px; margin: 8px 0 4px; color: var(--primary); }
.login-sub { color: var(--muted); font-size: 14px; margin-bottom: 20px; }
.login-card form { text-align: left; }
.login-card label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--muted);
    margin-bottom: 14px;
}
.login-card input {
    width: 100%;
    margin-top: 5px;
    padding: 11px 12px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 15px;
}
.login-card input:focus { outline: 2px solid var(--accent); border-color: transparent; }

/* ---------- Buttons & alerts ---------- */
.btn {
    display: inline-block;
    padding: 8px 16px;
    border: none;
    border-radius: 8px;
    background: var(--border);
    color: var(--text);
    font-size: 14px;
    cursor: pointer;
    text-decoration: none;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-light); }
.btn-block { width: 100%; padding: 12px; font-size: 15px; }
.btn-sm { padding: 4px 10px; font-size: 12px; }
.alert { padding: 10px 14px; border-radius: 8px; font-size: 14px; margin-bottom: 16px; }
.alert-error { background: #fee2e2; color: var(--danger); }

/* ---------- Layout ---------- */
.topbar {
    position: fixed;
    top: 0; left: 0; right: 0;
    height: var(--topbar-h);
    background: var(--primary);
    color: #fff;
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 0 16px;
    z-index: 20;
}
.topbar-title { font-weight: 600; flex: 1; }
.topbar-user { font-size: 13px; display: flex; align-items: center; gap: 8px; }
.topbar-user small { opacity: .7; }
.menu-toggle {
    background: none;
    border: none;
    color: #fff;
    font-size: 22px;
    cursor: pointer;
    display: none;
}

.sidebar {
    position: fixed;
    top: var(--topbar-h);
    left: 0;
    bottom: 0;
    width: var(--sidebar-w);
    background: var(--card);
    border-right: 1px solid var(--border);
    overflow-y: auto;
    padding: 12px 0;
}
.sidebar a {
    display: block;
    padding: 9px 20px;
    color: var(--text);
    text-decoration: none;
    font-size: 14px;
}
.sidebar a.active { background: #e0f2fe; color: var(--primary); font-weight: 600; }
.sidebar a:hover:not(.disabled) { background: var(--bg); }
.sidebar a.disabled { color: #b0b8c4; cursor: default; }
.sidebar a.disabled em { font-size: 10px; font-style: normal; background: var(--bg); padding: 1px 6px; border-radius: 8px; margin-left: 4px; }
.nav-group {
    padding: 14px 20px 4px;
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .5px;
    color: var(--muted);
}

.content {
    margin-left: var(--sidebar-w);
    margin-top: var(--topbar-h);
    padding: 24px;
}
.content h1 { font-size: 22px; margin-bottom: 4px; }
.muted { color: var(--muted); font-size: 14px; margin-bottom: 20px; }

/* ---------- Cards ---------- */
.cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 16px;
}
.card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 18px;
}
.card-label { font-size: 13px; color: var(--muted); margin-bottom: 6px; }
.card-value { font-size: 24px; font-weight: 700; }
.card-value.ok { color: var(--ok); font-size: 18px; }

/* ---------- Mobile ---------- */
@media (max-width: 768px) {
    .menu-toggle { display: block; }
    .sidebar { transform: translateX(-100%); transition: transform .2s; z-index: 15; }
    body.sidebar-open .sidebar { transform: translateX(0); box-shadow: 4px 0 20px rgba(0,0,0,.15); }
    .content { margin-left: 0; padding: 16px; }
    .topbar-user small { display: none; }
}