:root {
    --pmu-green: #1a4d2e;
    --pmu-green-dark: #123620;
    --pmu-green-light: #28a745;
    --pmu-white-soft: #f8fafc;
    --pmu-accent: #f8fafc;
    --pmu-red: #dc3545;
    --sidebar-width: 270px;
    --card-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
    --topbar-height: 70px;
    --pmu-gradient: linear-gradient(135deg, #1a4d2e 0%, #2e7d32 100%);
}

body {
    font-family: 'Inter', sans-serif;
    background-color: #f6f9fc;
    color: #334155;
    overflow-x: hidden;
    margin: 0;
}

/* Sidebar Styling */
#sidebar {
    width: var(--sidebar-width);
    height: 100vh;
    background-color: var(--pmu-green);
    background-image: linear-gradient(180deg, #1a4d2e 0%, #123620 100%);
    color: white;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: fixed;
    top: 0;
    left: 0;
    z-index: 1050;
    border-right: 1px solid rgba(255, 255, 255, 0.05);
    overflow-y: auto;
    overflow-x: hidden;
}

#sidebar.collapsed {
    left: calc(-1 * var(--sidebar-width));
}

#sidebar .logo {
    padding: 2.5rem 1rem;
    text-align: center;
}

#sidebar .logo img {
    max-height: 80px;
    margin-bottom: 1rem;
    filter: drop-shadow(0 4px 10px rgba(0,0,0,0.2));
}

#sidebar .logo h6 {
    letter-spacing: 2px;
    font-size: 0.9rem;
    font-weight: 700;
    margin-bottom: 0;
    color: #ffffff;
}

#sidebar .logo small {
    letter-spacing: 1px;
    color: rgba(255, 255, 255, 0.6);
}

#sidebar .nav-link {
    color: rgba(255, 255, 255, 0.7);
    padding: 12px 20px;
    font-weight: 500;
    font-size: 0.85rem;
    display: flex;
    align-items: center;
    border-radius: 12px;
    margin: 4px 16px;
    transition: all 0.3s;
    letter-spacing: 0.3px;
}

#sidebar .nav-link i {
    font-size: 1.1rem;
    width: 28px;
    transition: transform 0.3s;
}

#sidebar .nav-link:hover {
    background-color: rgba(255, 255, 255, 0.1);
    color: white;
    transform: translateX(5px);
}

#sidebar .nav-link:hover i {
    transform: scale(1.1);
}

#sidebar .nav-link.active {
    background-color: rgba(255, 255, 255, 0.15);
    color: #ffffff;
    font-weight: 700;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

#sidebar .nav-group-title {
    padding: 24px 24px 8px;
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: rgba(255, 255, 255, 0.4);
    font-weight: 800;
}

/* Main Content Styling */
#content {
    margin-left: var(--sidebar-width);
    width: 100%;
    min-height: 100vh;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    padding: calc(var(--topbar-height) + 40px) 30px 40px;
}

#content.expanded {
    margin-left: 0;
}

.topbar {
    position: fixed;
    top: 20px;
    right: 30px;
    left: calc(var(--sidebar-width) + 30px);
    height: var(--topbar-height);
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    padding: 0 25px;
    border-radius: 20px;
    z-index: 1040;
    box-shadow: 0 4px 25px rgba(0, 0, 0, 0.03);
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border: 1px solid rgba(255, 255, 255, 0.5);
}

#content.expanded .topbar {
    left: 30px;
}

/* Base Card Styling */
.card {
    border: none;
    border-radius: 20px;
    box-shadow: var(--card-shadow);
    transition: transform 0.3s, box-shadow 0.3s;
}

.card:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.06);
}

/* Premium Tables */
.table thead th {
    background-color: #fcfdfe;
    color: #64748b;
    text-transform: uppercase;
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 1px;
    padding: 1rem 1.25rem;
    border-bottom: 2px solid #f1f5f9;
}

.table tbody td {
    padding: 1rem 1.25rem;
    font-size: 0.85rem;
    color: #475569;
    vertical-align: middle;
}

/* Inputs & Forms */
.form-control, .form-select {
    border-radius: 12px;
    padding: 0.6rem 1.1rem;
    border: 1px solid #e2e8f0;
    font-size: 0.85rem;
    transition: all 0.3s;
}

.form-control:focus, .form-select:focus {
    box-shadow: 0 0 0 4px rgba(26, 77, 46, 0.1);
    border-color: var(--pmu-green);
}

.btn {
    border-radius: 12px;
    padding: 0.75rem 1.5rem;
    font-weight: 600;
    transition: all 0.3s;
}

.btn-success {
    background: var(--pmu-gradient);
    border: none;
    color: white !important;
}

.btn-pmu {
    background: var(--pmu-gradient);
    color: white !important;
}

.btn-success:hover {
    background: linear-gradient(135deg, #123620 0%, #1a4d2e 100%);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(26, 77, 46, 0.3);
}

/* Responsive Rules */
@media (max-width: 991.98px) {
    #sidebar {
        left: calc(-1 * var(--sidebar-width));
    }
    #sidebar.show {
        left: 0;
        box-shadow: 20px 0 60px rgba(0,0,0,0.4);
    }
    #content {
        margin-left: 0;
        padding-top: calc(var(--topbar-height) + 30px);
        padding-left: 20px;
        padding-right: 20px;
    }
    .topbar {
        left: 20px !important;
        right: 20px;
        top: 15px;
    }
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}
::-webkit-scrollbar-track {
    background: #f1f5f9;
}
::-webkit-scrollbar-thumb {
    background: #cbd5e1;
    border-radius: 10px;
    border: 2px solid #f1f5f9;
}
::-webkit-scrollbar-thumb:hover {
    background: #94a3b8;
}

/* Utils */
.rounded-4 { border-radius: 20px !important; }
.bg-pmu { background: var(--pmu-gradient); }
.bg-pmu-soft { background-color: rgba(26, 77, 46, 0.1) !important; color: var(--pmu-green) !important; }
.text-pmu { color: var(--pmu-green) !important; }

/* Dashboard Cards */
.stat-card {
    position: relative;
    overflow: hidden;
}

.stat-card i {
    position: absolute;
    right: -10px;
    bottom: -10px;
    font-size: 5rem;
    opacity: 0.1;
    transform: rotate(-15deg);
}

.badge {
    padding: 0.6em 1em;
    font-weight: 600;
    border-radius: 10px;
}