/* ===== Base ===== */
body {
    background-color: #f4f6f9;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

/* ===== Sidebar ===== */
.sidebar {
    width: 250px;
    min-height: 100vh;
    background: linear-gradient(180deg, #2f3b52, #263247);
    box-shadow: 2px 0 10px rgba(0,0,0,.12);
}

.sidebar-brand {
    font-size: 1.3rem;
    font-weight: 600;
    padding: 1rem;
    color: #fff;
    border-bottom: 1px solid rgba(255,255,255,.15);
}

.sidebar .nav-link {
    color: #adb5bd;
    padding: 12px 18px;
    border-radius: 6px;
    margin: 4px 10px;
    transition: all .2s ease;
}

.sidebar .nav-link:hover {
    background-color: rgba(255,255,255,.08);
    color: #fff;
}

.sidebar .nav-link.active {
    background-color: #0d6efd;
    color: #fff;
    box-shadow: 0 4px 10px rgba(13,110,253,.35);
}

/* ===== Content ===== */
.content-wrapper {
    padding: 30px;
}

.content-card {
    background: #ffffff;
    border-radius: 12px;
    padding: 40px;
    box-shadow: 0 8px 25px rgba(0,0,0,.06);
    min-height: calc(100vh - 140px);
}

/* ===== Footer ===== */
footer {
        background: linear-gradient(180deg, #263247, #1f2937);
    color: #d1d5db;
    font-size: 14px;
    border-top: 1px solid rgba(255,255,255,.08);
}

/* ===== Buttons Enhancement ===== */
.btn-outline-secondary {
    border-color: #adb5bd;
    color: #495057;
}

.btn-outline-secondary:hover {
    background-color: #e9ecef;
    color: #212529;
}