/* Header Navigation Bar Styles */
.header-navbar {
    background-color: #2c3e50;
    padding: 0;
    position: relative;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.header-navbar .header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 20px;
    position: relative;
}

/* Desktop Navigation */
.header-nav-menu {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
}

.header-nav-menu li {
    margin: 0;
}

.header-nav-link {
    display: block;
    padding: 15px 20px;
    color: white !important;
    text-decoration: none;
    transition: background-color 0.3s ease;
}

.header-nav-link:hover {
    background-color: #34495e;
    color: #fff !important;
}

/* Mobile Toggle Button */
.header-nav-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
    padding: 10px;
    background: none;
    border: none;
    z-index: 10001;
}

.header-nav-toggle span {
    width: 25px;
    height: 3px;
    background-color: white;
    margin: 3px 0;
    transition: 0.4s;
    display: block;
}

/* Mobile Styles */
@media screen and (max-width: 768px) {
    .header-nav-toggle {
        display: flex;
    }
    
    .header-nav-menu {
        position: absolute;
        left: -100%;
        top: 100%;
        flex-direction: column;
        background-color: #2c3e50;
        width: 100%;
        text-align: left;
        transition: left 0.3s ease;
        box-shadow: 0 10px 27px rgba(0, 0, 0, 0.3);
        z-index: 10000;
        padding: 0;
        margin: 0;
        opacity: 0;
        visibility: hidden;
    }

    .header-nav-menu.header-nav-active {
        left: 0;
        opacity: 1;
        visibility: visible;
    }

    .header-nav-menu li {
        margin: 0;
        width: 100%;
    }

    .header-nav-menu li a {
        padding: 15px 20px;
        display: block;
        border-bottom: 1px solid #34495e;
        color: white !important;
        width: 100%;
        box-sizing: border-box;
    }

    .header-nav-menu li a:hover {
        background-color: #34495e;
        color: white !important;
    }

    .header-nav-menu li:last-child a {
        border-bottom: none;
    }

    /* Hamburger Animation */
    .header-nav-toggle.header-nav-toggle-active span:nth-child(1) {
        transform: rotate(-45deg) translate(-5px, 6px);
    }

    .header-nav-toggle.header-nav-toggle-active span:nth-child(2) {
        opacity: 0;
    }

    .header-nav-toggle.header-nav-toggle-active span:nth-child(3) {
        transform: rotate(45deg) translate(-5px, -6px);
    }
}

/* Prevent body scroll when menu is open */
body.header-menu-open {
    overflow: hidden;
}

@media screen and (max-width: 768px) {
    .header-navbar {
        position: relative;
    }
}

/* Top Bar Styles */
.header-top-bar {
    background-color: #34495e;
    color: white;
    padding: 8px 0;
    font-size: 14px;
}

.header-top-bar .header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 20px;
}

.header-top-left i {
    margin-right: 8px;
}

.header-marquee {
    overflow: hidden;
    white-space: nowrap;
}

.header-marquee span {
    display: inline-block;
    animation: scroll-left 20s linear infinite;
}

@keyframes scroll-left {
    0% { transform: translateX(100%); }
    100% { transform: translateX(-100%); }
}

/* Middle Bar Styles */
.header-middle-bar {
    background-color: #ecf0f1;
    padding: 20px 0;
    border-bottom: 3px solid #3498db;
}

.header-middle-bar .header-container {
    display: flex;
    align-items: center;
    padding: 0 20px;
}

.header-logo-section {
    margin-right: 20px;
}

.header-logo {
    height: 80px;
    width: auto;
}

.header-institute-info h1 {
    color: #2c3e50;
    margin: 0;
    font-size: 28px;
    font-weight: 700;
}

.header-tagline {
    color: #7f8c8d;
    margin: 5px 0 0 0;
    font-size: 16px;
}

/* Mobile Responsive Styles */
@media screen and (max-width: 768px) {
    .header-middle-bar .header-container {
        flex-direction: column;
        text-align: center;
    }
    
    .header-logo-section {
        margin-right: 0;
        margin-bottom: 15px;
    }
    
    .header-institute-info h1 {
        font-size: 20px;
    }
    
    .header-tagline {
        font-size: 14px;
    }
    
    .header-top-bar .header-container {
        flex-direction: column;
        gap: 10px;
    }
    
    .header-marquee {
        width: 100%;
    }
}

@media screen and (max-width: 480px) {
    .header-institute-info h1 {
        font-size: 18px;
    }
    
    .header-logo {
        height: 60px;
    }
    
    .header-top-bar {
        font-size: 12px;
    }
}