:root {
    --sidebar-width: 240px;
    --sidebar-bg: #0f172a;
    --sidebar-hover: #1e293b;
    --sidebar-active: #3b82f6;
    --topbar-height: 60px;
    --body-bg: #f8fafc;
    --text-muted-custom: #94a3b8;
}

* { box-sizing: border-box; }

body {
    font-family: 'Inter', sans-serif;
    background: var(--body-bg);
    color: #1e293b;
    margin: 0;
}

/* ── Sidebar ── */
#sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: var(--sidebar-width);
    height: 100vh;
    background: var(--sidebar-bg);
    display: flex;
    flex-direction: column;
    z-index: 100;
    transition: transform 0.25s ease;
}

.sidebar-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 20px 20px 16px;
    border-bottom: 1px solid #1e293b;
    text-decoration: none;
}

.sidebar-brand-icon {
    width: 34px;
    height: 34px;
    background: var(--sidebar-active);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 16px;
    flex-shrink: 0;
}

.sidebar-brand-text {
    font-weight: 700;
    font-size: 17px;
    color: #fff;
    letter-spacing: -0.3px;
}

.sidebar-nav {
    flex: 1;
    padding: 12px 10px;
    overflow-y: auto;
}

.sidebar-label {
    font-size: 10px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-muted-custom);
    padding: 12px 10px 6px;
}

.sidebar-link {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 9px 10px;
    border-radius: 8px;
    color: #cbd5e1;
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: background 0.15s, color 0.15s;
    margin-bottom: 2px;
}

.sidebar-link i {
    font-size: 16px;
    width: 20px;
    text-align: center;
    flex-shrink: 0;
}

.sidebar-link:hover {
    background: var(--sidebar-hover);
    color: #fff;
}

.sidebar-link.active {
    background: var(--sidebar-active);
    color: #fff;
}

.sidebar-footer {
    padding: 12px 10px;
    border-top: 1px solid #1e293b;
}

.sidebar-footer .sidebar-link {
    color: #f87171;
}

.sidebar-footer .sidebar-link:hover {
    background: rgba(248, 113, 113, 0.1);
    color: #f87171;
}

/* ── Main wrapper ── */
#main-wrapper {
    margin-left: var(--sidebar-width);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* ── Topbar ── */
#topbar {
    height: var(--topbar-height);
    background: #fff;
    border-bottom: 1px solid #e2e8f0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
    position: sticky;
    top: 0;
    z-index: 50;
}

.topbar-title {
    font-size: 16px;
    font-weight: 600;
    color: #1e293b;
}

.topbar-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.avatar {
    width: 34px;
    height: 34px;
    border-radius: 50%;
    background: linear-gradient(135deg, #3b82f6, #8b5cf6);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
}

/* ── Content ── */
#content {
    flex: 1;
    padding: 28px 28px 0;
}

/* ── Footer ── */
#footer {
    padding: 16px 28px;
    margin-top: 28px;
    border-top: 1px solid #e2e8f0;
    font-size: 13px;
    color: #94a3b8;
}

/* ── Cards ── */
.card {
    border: 1px solid #e2e8f0;
    border-radius: 12px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
}

.card-header {
    background: transparent;
    border-bottom: 1px solid #e2e8f0;
    font-weight: 600;
}

/* ── Alerts ── */
.alert {
    border-radius: 10px;
    border: none;
}

/* ── Auth pages ── */
body.auth-body {
    background: linear-gradient(135deg, #0f172a 0%, #1e3a5f 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.auth-card {
    background: #fff;
    border-radius: 16px;
    padding: 40px;
    width: 100%;
    max-width: 420px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.auth-logo {
    width: 44px;
    height: 44px;
    background: #3b82f6;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 20px;
    margin: 0 auto 20px;
}

.auth-title {
    font-size: 22px;
    font-weight: 700;
    color: #0f172a;
    text-align: center;
    margin-bottom: 6px;
}

.auth-subtitle {
    font-size: 14px;
    color: #64748b;
    text-align: center;
    margin-bottom: 28px;
}

.auth-card .form-label {
    font-size: 13px;
    font-weight: 500;
    color: #374151;
    margin-bottom: 6px;
}

.auth-card .form-control {
    border-radius: 8px;
    border-color: #e2e8f0;
    font-size: 14px;
    padding: 10px 12px;
    transition: border-color 0.15s, box-shadow 0.15s;
}

.auth-card .form-control:focus {
    border-color: #3b82f6;
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

.btn-auth {
    width: 100%;
    padding: 11px;
    border-radius: 8px;
    font-weight: 600;
    font-size: 14px;
    background: #3b82f6;
    border: none;
    color: #fff;
    transition: background 0.15s;
}

.btn-auth:hover {
    background: #2563eb;
    color: #fff;
}

.auth-footer-text {
    text-align: center;
    font-size: 13px;
    color: #64748b;
    margin-top: 20px;
}

.auth-footer-text a {
    color: #3b82f6;
    text-decoration: none;
    font-weight: 500;
}

.auth-footer-text a:hover {
    text-decoration: underline;
}

/* ── Responsive ── */
@media (max-width: 768px) {
    #sidebar {
        transform: translateX(-100%);
    }

    #sidebar.open {
        transform: translateX(0);
    }

    #main-wrapper {
        margin-left: 0;
    }
}