/* Modern Slidebar Navigation Styles */
:root {
    --primary-blue: #1e3799;
    --secondary-blue: #0984e3;
    --primary-orange: #e67e22;
    --secondary-orange: #f39c12;
    --hover-orange: #d35400;
    --text-light: #ecf0f1;
    --text-dark: #2c3e50;
    --bg-dark: rgba(0, 0, 0, 0.95);
    --transition-speed: 0.3s;
}

/* Main Navigation Container */
#slidebar-navigation {
    position: fixed;
    top: 0;
    left: -300px;
    width: 300px;
    height: 100vh;
    background: var(--bg-dark);
    transition: left var(--transition-speed) ease;
    z-index: 9999;
    box-shadow: 2px 0 10px rgba(0, 0, 0, 0.3);
    overflow-y: auto;
}

#slidebar-navigation.open {
    left: 0;
}

/* Toggle Button */
#slidebar-toggle {
    position: fixed;
    top: 20px;
    left: 20px;
    width: 40px;
    height: 40px;
    background: var(--primary-blue);
    border-radius: 5px;
    cursor: pointer;
    z-index: 10000;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    transition: background-color var(--transition-speed);
}

#slidebar-toggle:hover {
    background: var(--secondary-blue);
}

#slidebar-toggle span {
    display: block;
    width: 24px;
    height: 3px;
    background: var(--text-light);
    margin: 2px 0;
    transition: transform var(--transition-speed), opacity var(--transition-speed);
}

#slidebar-navigation.open #slidebar-toggle span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

#slidebar-navigation.open #slidebar-toggle span:nth-child(2) {
    opacity: 0;
}

#slidebar-navigation.open #slidebar-toggle span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* Navigation Menu */
#slidebar-nav {
    padding: 60px 0 20px;
}

.slidebar-menu {
    list-style: none;
    padding: 0;
    margin: 0;
}

.slidebar-menu li {
    margin: 0;
    padding: 0;
}

.slidebar-menu a {
    display: flex;
    align-items: center;
    padding: 12px 20px;
    color: #FFFFFF; /* เปลี่ยนสีข้อความเป็นสีขาว */
    text-decoration: none;
    font-size: 16px;
    transition: background var(--transition-speed), color var(--transition-speed);
    border-left: 4px solid transparent;
}

.slidebar-menu a:hover {
    background: var(--primary-blue);
    color: var(--primary-orange);
    border-left-color: var(--primary-orange);
}

/* Active State */
.slidebar-menu .active > a {
    background: var(--primary-blue);
    color: var(--primary-orange);
    border-left-color: var(--primary-orange);
}

/* Icons */
.slidebar-menu a i {
    margin-right: 10px;
    width: 20px;
    text-align: center;
    color: var(--primary-orange);
}

/* Submenu Styles */
.slidebar-menu .sub-menu {
    list-style: none;
    padding: 0;
    margin: 0;
    background: rgba(0, 0, 0, 0.2);
    overflow: hidden;
    max-height: 0;
    transition: max-height var(--transition-speed) ease;
}

.slidebar-menu .has-children > a::after {
    content: '›';
    margin-left: auto;
    transform: rotate(90deg);
    transition: transform var(--transition-speed);
    font-size: 20px;
    color: var(--primary-orange);
}

.slidebar-menu .has-children.open > a::after {
    transform: rotate(-90deg);
}

.slidebar-menu .has-children.open > .sub-menu {
    max-height: 1000px;
}

.slidebar-menu .sub-menu a {
    color: #b8b8b8; /* สีเทาอ่อนสำหรับ submenu */
    padding-left: 40px;
    font-size: 14px;
    background: rgba(30, 55, 153, 0.1);
}

.slidebar-menu .sub-menu .sub-menu a {
    padding-left: 60px;
}

/* Hover Effects */
.slidebar-menu a:hover i {
    transform: scale(1.2);
    transition: transform var(--transition-speed);
}

/* Modern Scrollbar */
#slidebar-navigation::-webkit-scrollbar {
    width: 6px;
}

#slidebar-navigation::-webkit-scrollbar-track {
    background: var(--bg-dark);
}

#slidebar-navigation::-webkit-scrollbar-thumb {
    background: var(--primary-blue);
    border-radius: 3px;
}

#slidebar-navigation::-webkit-scrollbar-thumb:hover {
    background: var(--primary-orange);
}

/* Responsive Design */
@media screen and (max-width: 768px) {
    #slidebar-navigation {
        width: 260px;
        left: -260px;
    }

    .slidebar-menu a {
        padding: 10px 15px;
        font-size: 14px;
    }

    .slidebar-menu .sub-menu a {
        padding-left: 30px;
        font-size: 13px;
    }

    .slidebar-menu .sub-menu .sub-menu a {
        padding-left: 45px;
    }
}