/* ============================================================
   ADMINLTE-STYLE LAYOUT & SIDEBAR
   ============================================================ */

body {
    margin: 0;
    overflow-x: hidden;
    background-color: var(--bg-color);
}

.wrapper {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* ============================================================
   NAVBAR (HEADER)
   ============================================================ */
.main-header {
    background: #ffffff;
    border-bottom: 1px solid #e2e8f0;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 20px;
    position: fixed;
    top: 0;
    right: 0;
    left: 250px;
    z-index: 1000;
    transition: left 0.3s ease-in-out;
}

[data-theme="dark"] .main-header {
    background: #1e293b;
    border-color: #334155;
}

.menu-toggle {
    background: transparent;
    border: none;
    font-size: 1.2rem;
    color: #64748b;
    cursor: pointer;
    padding: 5px 10px;
    transition: color 0.2s;
}

.menu-toggle:hover {
    color: #3b82f6;
}

[data-theme="dark"] .menu-toggle {
    color: #cbd5e1;
}

.nav-btn {
    background: transparent;
    border: none;
    font-size: 1.2rem;
    color: #64748b;
    cursor: pointer;
    transition: color 0.2s;
}

.nav-btn:hover {
    color: #3b82f6;
}

/* ============================================================
   SIDEBAR
   ============================================================ */
.main-sidebar {
    background: #1e293b;
    width: 250px;
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    z-index: 1038;
    box-shadow: 0 14px 28px rgba(0,0,0,0.25), 0 10px 10px rgba(0,0,0,0.22);
    transition: left 0.3s ease-in-out;
    display: flex;
    flex-direction: column;
}

.brand-logo {
    height: 60px;
    display: flex;
    align-items: center;
    padding: 0 20px;
    border-bottom: 1px solid #334155;
    color: #ffffff;
    font-size: 1.1rem;
    font-weight: 700;
    text-decoration: none;
    gap: 10px;
    letter-spacing: 0.5px;
}

.brand-logo i {
    color: #3b82f6;
}

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

.nav-sidebar {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.nav-item {
    width: 100%;
}

.nav-link {
    display: flex;
    align-items: center;
    color: #cbd5e1;
    padding: 10px 15px;
    border-radius: 8px;
    text-decoration: none;
    transition: background 0.2s, color 0.2s;
    cursor: pointer;
    font-weight: 500;
    font-size: 0.9rem;
}

.nav-link:hover {
    background: rgba(255,255,255,0.05);
    color: #ffffff;
}

.nav-link.active {
    background: #3b82f6;
    color: #ffffff;
    box-shadow: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.24);
}

.nav-icon {
    width: 25px;
    text-align: center;
    margin-right: 12px;
    font-size: 1rem;
    color: #94a3b8;
}

.nav-link:hover .nav-icon, .nav-link.active .nav-icon {
    color: #ffffff;
}

.nav-header {
    color: #64748b;
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    padding: 15px 15px 5px 15px;
    letter-spacing: 0.8px;
}

/* ============================================================
   CONTENT WRAPPER
   ============================================================ */
.content-wrapper {
    margin-left: 250px;
    margin-top: 60px;
    padding: 30px;
    min-height: calc(100vh - 60px);
    transition: margin-left 0.3s ease-in-out;
}

/* ============================================================
   RESPONSIVE / COLLAPSED SIDEBAR
   ============================================================ */
body.sidebar-collapse .main-sidebar {
    left: -250px;
}

body.sidebar-collapse .main-header {
    left: 0;
}

body.sidebar-collapse .content-wrapper {
    margin-left: 0;
}

@media (max-width: 992px) {
    .main-sidebar {
        left: -250px;
    }
    .main-header {
        left: 0;
    }
    .content-wrapper {
        margin-left: 0;
        padding: 15px;
    }

    body.sidebar-open .main-sidebar {
        left: 0;
    }

    /* Backdrop for mobile */
    .sidebar-overlay {
        position: fixed;
        top: 0;
        left: 0;
        width: 100vw;
        height: 100vh;
        background: rgba(0,0,0,0.5);
        z-index: 1037;
        display: none;
        opacity: 0;
        transition: opacity 0.3s;
    }

    body.sidebar-open .sidebar-overlay {
        display: block;
        opacity: 1;
    }
}