:root {
    --primary-color: #088395;
    --text-dark: #1a1a1a;
    --text-muted: #636e72;
    --text-light: #ffffff;
    --bg-white: #ffffff;
    --footer-bg: #2d3436;
    --hover-bg: #f0f9fa;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: #f8fafa;
    color: var(--text-dark);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Header Styling */
header {
    background-color: var(--primary-color);
    padding: 1rem 5%;
    position: sticky;
    top: 0;
    z-index: 1000;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.logo {
    color: white;
    font-size: 1.4rem;
    font-weight: 700;
    text-decoration: none;
    z-index: 1001;
}

/* Nav Menu */
nav ul {
    list-style: none;
    display: flex;
    gap: 1.5rem;
}

nav a {
    text-decoration: none;
    color: var(--text-light);
    font-size: 0.9rem;
    padding: 0.5rem 1rem;
    transition: 0.3s;
    border-radius: 5px;
}

nav a:hover { 
    background-color: rgba(255, 255, 255, 0.2); 
    transform: translateY(-2px);
}

/* Hamburger Icon */
.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    z-index: 1001;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background-color: white;
    border-radius: 2px;
    transition: 0.3s;
}

/* Main Content Area */
main {
    flex: 1;
    background-color: var(--bg-white);
    max-width: 800px;
    margin: 40px auto;
    padding: 60px 40px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.03);
    border-radius: 12px;
    text-align: center;
}

h1 {
    color: var(--primary-color);
    font-size: 2.5rem;
    font-weight: 600;
    margin-bottom: 10px;
}

.subtitle {
    color: var(--text-muted);
    font-size: 1rem;
    margin-bottom: 40px;
}

/* Resource List Styling */
.resource-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.year-btn {
    display: flex;
    justify-content: space-between;
    align-items: center;
    text-decoration: none;
    background: #ffffff;
    border: 1px solid #eeeeee;
    padding: 18px 30px;
    border-radius: 8px;
    color: var(--text-dark);
    font-size: 1.1rem;
    transition: all 0.3s ease;
}

.year-btn:hover {
    border-color: var(--primary-color);
    background-color: var(--hover-bg);
    color: var(--primary-color);
    transform: translateX(10px);
    box-shadow: 0 4px 15px rgba(8, 131, 149, 0.1);
}

.year-btn::after {
    content: '→';
    font-size: 1.2rem;
    opacity: 0;
    transition: 0.3s;
}

.year-btn:hover::after { opacity: 1; }

/* Footer */
footer {
    background-color: var(--footer-bg);
    color: var(--text-light);
    text-align: center;
    padding: 40px;
    margin-top: auto;
}

/* Responsive Logic */
@media (max-width: 768px) {
    .hamburger { display: flex; }

    nav ul {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background-color: var(--primary-color);
        padding: 20px 0;
        text-align: center;
        box-shadow: 0 5px 10px rgba(0,0,0,0.1);
    }

    nav ul.active { display: flex; }

    main { margin: 20px; padding: 40px 20px; }
    h1 { font-size: 1.8rem; }
}