/* --- SIDEBAR --- */
/* HIDDEN: Đang sử dụng Top Navigation layout (xem header.css) */
.sidebar {
    position: fixed;
    left: 0;
    top: 0;
    width: 280px;
    height: 100vh;
    /* Premium gradient background */
    background: linear-gradient(180deg,
            rgba(240, 247, 255, 0.95) 0%,
            rgba(255, 250, 240, 0.95) 100%);
    border-right: 2px solid rgba(0, 91, 150, 0.15);
    padding: 2rem 1.5rem;
    display: flex;
    flex-direction: column;
    transition: transform 0.3s ease;
    z-index: 100;
    overflow-y: auto;
    backdrop-filter: blur(15px);
    box-shadow: 2px 0 20px rgba(0, 91, 150, 0.08);
}

.welcome-message {
    line-height: 1.5;
}

.welcome-message strong {
    font-weight: 700;
    color: var(--text-color-primary);
    display: block;
    font-size: 1.3rem;
    margin-bottom: 5px;
}

.info-widget {
    background: linear-gradient(135deg,
            rgba(255, 255, 255, 0.9) 0%,
            rgba(240, 247, 255, 0.8) 100%);
    border: 1px solid rgba(0, 91, 150, 0.15);
    border-radius: 14px;
    padding: 1.2rem;
    margin-bottom: 1.5rem;
    text-align: center;
    font-size: 0.9rem;
    color: var(--text-color);
    box-shadow:
        0 4px 12px rgba(0, 91, 150, 0.08),
        inset 0 1px 0 rgba(255, 255, 255, 0.8);
    transition: all 0.3s ease;
}

.info-widget:hover {
    transform: translateY(-2px);
    box-shadow:
        0 8px 20px rgba(0, 91, 150, 0.12),
        inset 0 1px 0 rgba(255, 255, 255, 0.9);
}

.info-widget div {
    margin-bottom: 0.25rem;
}

.info-widget span {
    font-weight: bold;
    color: var(--aura-color-2);
}

#current-date {
    font-size: 0.85rem;
    opacity: 0.8;
}


.nav-menu {
    list-style: none;
    margin-bottom: 1rem;
    flex-grow: 1;
    overflow-y: auto;
    padding-right: 5px;
}

/* Custom Scrollbar for Sidebar - GRADIENT XANH CAM */
.nav-menu::-webkit-scrollbar {
    width: 6px;
}

.nav-menu::-webkit-scrollbar-track {
    background: rgba(0, 91, 150, 0.05);
    border-radius: 10px;
}

.nav-menu::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, #005B96 0%, #FF7A00 100%);
    border-radius: 10px;
    transition: all 0.3s ease;
}

.nav-menu::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(180deg, #004080 0%, #FF9944 100%);
    box-shadow: 0 0 8px rgba(0, 91, 150, 0.4);
}

.nav-menu li {
    margin-bottom: 0.5rem;
}

.nav-btn {
    display: flex;
    align-items: center;
    width: 100%;
    padding: 0.9rem 1.2rem;
    background: linear-gradient(135deg,
            rgba(255, 255, 255, 0.7) 0%,
            rgba(240, 247, 255, 0.5) 100%);
    border: 1px solid rgba(0, 91, 150, 0.08);
    color: var(--text-color-secondary);
    text-align: left;
    font-size: 1rem;
    font-family: var(--font-body);
    font-weight: 500;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

/* Gradient overlay on hover */
.nav-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg,
            transparent 0%,
            rgba(0, 91, 150, 0.1) 50%,
            transparent 100%);
    transition: left 0.5s ease;
}

.nav-btn:hover {
    background: linear-gradient(135deg,
            rgba(0, 91, 150, 0.12) 0%,
            rgba(255, 122, 0, 0.08) 100%);
    color: var(--text-color-primary);
    transform: translateX(5px) scale(1.02);
    border-color: rgba(0, 91, 150, 0.2);
    box-shadow:
        0 4px 12px rgba(0, 91, 150, 0.15),
        inset 0 1px 0 rgba(255, 255, 255, 0.5);
}

.nav-btn:hover::before {
    left: 100%;
    /* Slide gradient across */
}

.nav-btn.active {
    background: linear-gradient(135deg, #005B96 0%, #FF7A00 100%);
    color: #ffffff;
    font-weight: 600;
    box-shadow:
        0 6px 20px rgba(0, 91, 150, 0.35),
        inset 0 1px 0 rgba(255, 255, 255, 0.2);
    border: none;
    transform: translateX(3px);
}

.nav-menu .nav-group {
    margin-bottom: 0.5rem;
    border-radius: 12px;
    overflow: hidden;
    background-color: transparent;
    transition: background-color 0.3s;
}

.nav-group.open {
    background-color: rgba(0, 91, 150, 0.03);
}

.nav-group-toggle {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    padding: 0.9rem 1.2rem;
    background: none;
    border: none;
    color: var(--text-color-secondary);
    text-align: left;
    font-size: 1rem;
    font-family: var(--font-body);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    border-radius: 12px;
}

.nav-group-toggle:hover {
    background-color: rgba(0, 91, 150, 0.05);
    color: var(--text-color-primary);
}

.nav-group-toggle::after {
    content: '›';
    font-size: 1.5rem;
    font-weight: bold;
    transition: transform 0.3s ease;
    color: var(--text-color-secondary);
}

.nav-group.open>.nav-group-toggle::after {
    transform: rotate(90deg);
    color: var(--primary-blue);
}

.nav-submenu {
    list-style: none;
    padding-left: 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease-out;
    background-color: transparent;
}

.nav-group.open>.nav-submenu {
    max-height: 500px;
    padding-bottom: 0.5rem;
}

.nav-submenu li {
    margin: 2px 0;
}

.nav-submenu .nav-btn {
    padding-left: 2.5rem;
    font-weight: normal;
    font-size: 0.95rem;
    border-radius: 0 12px 12px 0;
    border-left: 2px solid transparent;
    background: linear-gradient(90deg,
            rgba(255, 255, 255, 0.5) 0%,
            rgba(240, 247, 255, 0.3) 100%);
}

.nav-submenu .nav-btn:hover {
    border-left-color: var(--aura-color-1);
    background: linear-gradient(90deg,
            rgba(0, 91, 150, 0.08) 0%,
            rgba(255, 122, 0, 0.05) 100%);
    transform: translateX(5px);
}

.nav-submenu .nav-btn.active {
    background: linear-gradient(90deg,
            rgba(0, 91, 150, 0.2) 0%,
            rgba(255, 122, 0, 0.1) 100%);
    color: var(--aura-color-2);
    border-left-color: var(--aura-color-2);
    border-left-width: 3px;
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.3);
    font-weight: 600;
}

.sidebar-footer {
    margin-top: auto;
    padding-top: 1.5rem;
    border-top: 1px solid rgba(0, 0, 0, 0.08);
}

.data-actions {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.8rem;
    margin-bottom: 1rem;
}

.sidebar-footer button {
    width: 100%;
    padding: 0.8rem;
    border-radius: 10px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 600;
    transition: all 0.3s ease;
    border: 1px solid rgba(0, 0, 0, 0.1);
    position: relative;
    overflow: hidden;
}

.sidebar-footer button::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg,
            transparent 0%,
            rgba(255, 255, 255, 0.3) 50%,
            transparent 100%);
    transition: left 0.4s ease;
}

.sidebar-footer button:hover::before {
    left: 100%;
}

.import-btn {
    background-color: rgba(16, 185, 129, 0.1);
    color: var(--success-color);
    border-color: var(--success-color);
}

.import-btn:hover {
    background-color: var(--success-color);
    color: white;
}

.export-btn {
    background-color: rgba(245, 158, 11, 0.1);
    color: var(--warning-color);
    border-color: var(--warning-color);
}

.export-btn:hover {
    background-color: var(--warning-color);
    color: white;
}

.logout-btn {
    background-color: transparent;
    color: var(--text-color-secondary);
    border: 1px solid rgba(0, 0, 0, 0.15);
}

.logout-btn:hover {
    background-color: rgba(239, 68, 68, 0.1);
    color: var(--danger-color);
    border-color: var(--danger-color);
}

/* --- MAIN CONTENT --- */
.main-content {
    width: calc(100% - 280px);
    height: 100%;
    display: flex;
    flex-direction: column;
    transition: width 0.3s ease;
    position: relative;
    z-index: 1;
}

.content-section {
    display: none;
    animation: fadeIn 0.6s cubic-bezier(0.22, 1, 0.36, 1);
    padding: 2rem 3rem;
    overflow-y: auto;
    flex-grow: 1;
    background-color: transparent;
    color: var(--text-color-primary);
}

.content-section.active {
    display: block;
}

/* Custom Scrollbar for Main Content */
.content-section::-webkit-scrollbar {
    width: 8px;
}

.content-section::-webkit-scrollbar-track {
    background: rgba(0, 0, 0, 0.03);
}

.content-section::-webkit-scrollbar-thumb {
    background: rgba(0, 91, 150, 0.2);
    border-radius: 4px;
}

.content-section::-webkit-scrollbar-thumb:hover {
    background: rgba(0, 91, 150, 0.3);
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px) scale(0.98);
    }

    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

/* Mobile specific */
.sidebar-header {
    display: flex !important;
    flex-direction: column;
    align-items: center;
    text-align: center;
    margin-bottom: 20px;
    padding: 1.5rem 1rem;
    background: linear-gradient(135deg,
            rgba(0, 91, 150, 0.04) 0%,
            rgba(255, 122, 0, 0.04) 100%);
    border-radius: 16px;
    border: 1px solid rgba(0, 91, 150, 0.1);
}

.profile-picture {
    display: block !important;
    width: 120px;
    height: 120px;
    border-radius: 50%;
    margin: 0 auto 1rem;
    object-fit: cover;
    /* Gradient border effect */
    padding: 4px;
    background: linear-gradient(135deg, #005B96 0%, #FF7A00 100%);
    box-shadow:
        0 8px 20px rgba(0, 91, 150, 0.3),
        0 0 0 3px rgba(255, 255, 255, 0.8),
        inset 0 0 0 4px #ffffff;
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    cursor: pointer;
}

.profile-picture:hover {
    transform: scale(1.08) rotate(3deg);
    box-shadow:
        0 15px 35px rgba(0, 91, 150, 0.4),
        0 0 0 4px rgba(255, 122, 0, 0.3),
        inset 0 0 0 4px #ffffff;
}

.welcome-message {
    display: block !important;
}

.mobile-top-bar {
    display: none !important;
}