:root {
    --primary-color: #003366; /* Deep Blue */
    --secondary-color: #C5A059; /* Gold */
    --accent-color: #E63946; /* Red for highlights */
    --text-color: #333333;
    --light-bg: #F8F9FA;
    --white: #FFFFFF;
    --border-color: #E0E0E0;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
    --font-main: 'Inter', sans-serif;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-main);
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--light-bg);
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }

p { margin-bottom: 1rem; }

/* Layout */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

section {
    padding: 60px 0;
}

/* Header */
header {
    background-color: var(--white);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: 10px;
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-links a {
    font-weight: 500;
    color: var(--text-color);
    position: relative;
}

.nav-links a:hover, .nav-links a.active {
    color: var(--primary-color);
}

.nav-links a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: -5px;
    left: 0;
    background-color: var(--secondary-color);
    transition: var(--transition);
}

.nav-links a:hover::after, .nav-links a.active::after {
    width: 100%;
}

.mobile-menu-btn {
    display: none;
    font-size: 1.5rem;
    cursor: pointer;
}

/* Hero Section */
.hero {
    background: linear-gradient(rgba(0, 51, 102, 0.8), rgba(0, 51, 102, 0.8)), url('https://placehold.co/1920x1080/003366/FFFFFF?text=TCVS+Campus');
    background-size: cover;
    background-position: center;
    color: var(--white);
    text-align: center;
    padding: 150px 0;
}

.hero h1 {
    color: var(--white);
    font-size: 3.5rem;
    margin-bottom: 1rem;
}

.hero p {
    font-size: 1.2rem;
    max-width: 800px;
    margin: 0 auto 2rem;
}

.btn {
    display: inline-block;
    padding: 12px 30px;
    background-color: var(--secondary-color);
    color: var(--white);
    border-radius: 5px;
    font-weight: 600;
    transition: var(--transition);
}

.btn:hover {
    background-color: #b08d45;
    transform: translateY(-2px);
}

/* Quick Links / Cards */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    margin-top: -50px;
    position: relative;
    z-index: 10;
}

.card {
    background: var(--white);
    padding: 30px;
    border-radius: 10px;
    box-shadow: var(--shadow);
    text-align: center;
    transition: var(--transition);
}

.card:hover {
    transform: translateY(-10px);
}

.card-icon {
    font-size: 3rem;
    color: var(--secondary-color);
    margin-bottom: 1rem;
}

.card h3 {
    margin-bottom: 1rem;
}

/* About Section Styles */
.about-content {
    background: var(--white);
    padding: 40px;
    border-radius: 10px;
    box-shadow: var(--shadow);
}

.vision-list {
    list-style: none;
    margin-top: 1rem;
}

.vision-list li {
    margin-bottom: 0.5rem;
    padding-left: 1.5rem;
    position: relative;
}

.vision-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--secondary-color);
    font-weight: bold;
}

/* Sidebar Layout (Admin & Academic) */
.sidebar-layout {
    display: flex;
    gap: 40px;
    align-items: flex-start;
}

.sidebar {
    flex: 0 0 250px;
    background: var(--white);
    padding: 20px;
    border-radius: 10px;
    box-shadow: var(--shadow);
    position: sticky;
    top: 100px;
}

.sidebar-nav li {
    margin-bottom: 10px;
}

.sidebar-nav a {
    display: block;
    padding: 10px 15px;
    border-radius: 5px;
    color: var(--text-color);
    font-weight: 500;
}

.sidebar-nav a:hover, .sidebar-nav a.active {
    background-color: var(--primary-color);
    color: var(--white);
}

.content-area {
    flex: 1;
    background: var(--white);
    padding: 40px;
    border-radius: 10px;
    box-shadow: var(--shadow);
}

.unit-section {
    margin-bottom: 60px;
    scroll-margin-top: 100px; /* For sticky header */
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 40px;
}

.unit-section:last-child {
    border-bottom: none;
}

.contact-info {
    background-color: var(--light-bg);
    padding: 20px;
    border-radius: 5px;
    margin-top: 20px;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 10px;
}

/* Footer */
footer {
    background-color: var(--primary-color);
    color: var(--white);
    padding: 60px 0 20px;
    margin-top: 60px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section h4 {
    color: var(--secondary-color);
    margin-bottom: 1.5rem;
}

.footer-links li {
    margin-bottom: 10px;
}

.footer-links a:hover {
    color: var(--secondary-color);
}

.copyright {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    font-size: 0.9rem;
    opacity: 0.8;
}

/* Responsive */
@media (max-width: 768px) {
    .navbar {
        flex-wrap: wrap;
    }

    .mobile-menu-btn {
        display: block;
    }

    .nav-links {
        display: none;
        width: 100%;
        flex-direction: column;
        gap: 0;
        margin-top: 1rem;
        background-color: var(--white);
        box-shadow: 0 10px 10px rgba(0,0,0,0.1);
    }

    .nav-links.active {
        display: flex;
    }

    .nav-links a {
        padding: 15px;
        border-bottom: 1px solid var(--border-color);
    }

    .hero h1 {
        font-size: 2.5rem;
    }

    .sidebar-layout {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
        position: static;
        overflow-x: auto;
    }

    .sidebar-nav {
        display: flex;
        gap: 10px;
        min-width: max-content;
    }
    
    .sidebar-nav a {
        white-space: nowrap;
    }
}

/* Download List Styles */
.download-list {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.download-item {
    display: flex;
    align-items: center;
    padding: 15px 20px;
    background: var(--white);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    transition: var(--transition);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.download-item:hover {
    box-shadow: var(--shadow);
    transform: translateY(-2px);
    border-color: var(--primary-color);
}

.download-item a {
    color: var(--text-color);
    font-weight: 500;
    flex: 1;
}

.download-item a:hover {
    color: var(--primary-color);
}

.download-item i {
    font-size: 1.2rem;
}

@media (max-width: 768px) {
    .download-item {
        padding: 12px 15px;
    }
    
    .download-item i {
        font-size: 1rem;
        margin-right: 8px !important;
    }
    
    .download-item a {
        font-size: 0.9rem;
    }
}