:root {
    --gradient-base-bg: #f5f7fa;
    --gradient-primary-start: #667eea;
    --gradient-primary-end: #764ba2;
    --gradient-text: #343a40;
    --gradient-card: #ffffff;
    --gradient-border: #e9ecef;
    --gradient-shadow: 0 10px 20px rgba(0, 0, 0, 0.05);
}

body {
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    background-attachment: fixed;
    min-height: 100vh;
    color: var(--gradient-text);
    font-family: 'Segoe UI', 'Roboto', 'Helvetica Neue', sans-serif;
    padding-top: 60px;
}

/* Navbar */
.navbar {
    background-color: #667eea;
    background: linear-gradient(135deg, var(--gradient-primary-start) 0%, var(--gradient-primary-end) 100%) !important;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    border-bottom: none;
    padding: 0.8rem 1rem;
}

.navbar-brand, .nav-link {
    color: rgba(255, 255, 255, 0.9) !important;
    font-weight: 600;
}

.nav-link:hover {
    color: #ffffff !important;
    transform: translateY(-1px);
}

.navbar .nav-link.active {
    color: #ffffff !important;
    font-weight: 700;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 8px;
}

/* Dropdown adjustments for gradient navbar */
.navbar .dropdown-menu {
    border: none;
    box-shadow: 0 10px 30px rgba(0,0,0,0.15);
    border-radius: 12px;
    margin-top: 10px;
}

.navbar .dropdown-item {
    color: var(--gradient-text);
    padding: 0.7rem 1.2rem;
    font-weight: 500;
}

.navbar .dropdown-item:hover {
    background-color: #f8f9fa;
    color: var(--gradient-primary-end);
}

.dropdown-item.active, .dropdown-item:active {
    background: linear-gradient(135deg, var(--gradient-primary-start) 0%, var(--gradient-primary-end) 100%);
    color: #fff !important;
}

/* Navbar toggler adjustment */
.navbar-toggler {
    border-color: rgba(255,255,255,0.5);
}

.navbar-toggler-icon {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba%28255, 255, 255, 0.9%29' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e") !important;
}


/* Cards */
.card {
    background-color: var(--gradient-card);
    border: none;
    border-radius: 15px;
    box-shadow: var(--gradient-shadow);
    margin-bottom: 2rem;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 15px 30px rgba(0,0,0,0.08);
}

.card-header {
    background-color: transparent;
    border-bottom: 1px solid var(--gradient-border);
    font-weight: 700;
    padding: 1.5rem;
    color: var(--gradient-text);
}

.card-body {
    padding: 1.5rem;
}

/* Buttons */
.btn {
    border: none;
    border-radius: 8px;
    padding: 0.6rem 1.5rem;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(0,0,0,0.1);
}

.btn-primary {
    background: linear-gradient(135deg, var(--gradient-primary-start) 0%, var(--gradient-primary-end) 100%);
    color: white;
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--gradient-primary-end) 0%, var(--gradient-primary-start) 100%);
    color: white;
}

.btn-secondary {
    background: #ffffff;
    color: var(--gradient-text);
    border: 1px solid var(--gradient-border);
}

.btn-secondary:hover {
    background: #f8f9fa;
    color: var(--gradient-text);
}

.btn-success {
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
    color: white;
}

.btn-danger {
    background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
    color: white;
}

/* Form Inputs */
.form-control, .form-select {
    background-color: #f8f9fa;
    border: 1px solid var(--gradient-border);
    border-radius: 10px;
    padding: 0.75rem 1rem;
    color: var(--gradient-text);
    box-shadow: none;
    transition: all 0.3s ease;
}

.form-control:focus, .form-select:focus {
    background-color: #ffffff;
    border-color: var(--gradient-primary-start);
    box-shadow: 0 0 0 4px rgba(102, 126, 234, 0.1);
}

/* Tables */
.table {
    --bs-table-bg: transparent;
    color: var(--gradient-text);
}

.table thead th {
    background-color: #f8f9fa;
    border-bottom: 2px solid var(--gradient-border);
    color: #6b7280;
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.05em;
    padding: 1rem 1.5rem;
}

.table td {
    padding: 1rem 1.5rem;
    vertical-align: middle;
    border-bottom: 1px solid var(--gradient-border);
}

.table-hover tbody tr:hover {
    background-color: #f8f9fa;
}

/* Mobile Responsiveness */
@media (max-width: 768px) {
    body {
        padding-top: 80px;
    }
    
    .sidebar {
        position: fixed;
        top: 0;
        left: -100%;
        height: 100vh;
        width: 80%;
        transition: left 0.3s ease;
        padding-top: 5rem;
        background: linear-gradient(180deg, var(--gradient-primary-start) 0%, var(--gradient-primary-end) 100%);
    }
    
    .sidebar.show {
        left: 0;
    }
}