* {
    font-family: 'Roboto', sans-serif;
}

.gradient-bg {
    background: linear-gradient(135deg, #1e40af 0%, #3b82f6 50%, #06b6d4 100%);
}

.card-hover {
    transition: all 0.3s ease;
}

.card-hover:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 40px rgba(0,0,0,0.15);
}

.nav-link {
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: #fbbf24;
    transition: width 0.3s ease;
}

.nav-link:hover::after {
    width: 100%;
}

.document-icon {
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 10px;
}

.pdf-icon { background: #ef4444; color: white; }
.xlsx-icon { background: #22c55e; color: white; }
.docx-icon { background: #3b82f6; color: white; }
.folder-icon { background: #f59e0b; color: white; }
.link-icon { background: #8b5cf6; color: white; }

.sidebar {
    position: fixed;
    left: 0;
    top: 0;
    height: 100vh;
    width: 280px;
    background: linear-gradient(180deg, #1e3a5f 0%, #0f172a 100%);
    transform: translateX(-100%);
    transition: transform 0.3s ease;
    z-index: 1000;
}

.sidebar.active {
    transform: translateX(0);
}

.overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 999;
}

.overlay.active {
    opacity: 1;
    visibility: visible;
}

.tab-button.active {
    background: #3b82f6;
    color: white;
}

.uds-section { display: none; }
.uds-section.active { display: block; }

.accordion-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.accordion-content.active {
    max-height: 1000px;
}

.rotate-icon {
    transition: transform 0.3s ease;
}

.rotate-icon.rotated {
    transform: rotate(180deg);
}