/* Base Styles */
:root {
    --primary-color: #0056b3;
    /* Academic Blue */
    --text-color: #333;
    --bg-color: #f9f9f9;
    --white: #ffffff;
    --gray: #e0e0e0;
}

body {
    font-family: 'Inter', 'Noto Sans JP', sans-serif;
    margin: 0;
    padding: 0;
    color: var(--text-color);
    background-color: var(--bg-color);
    line-height: 1.6;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Landing Page Specific */
.landing-body {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    text-align: center;
}

.landing-container h1 {
    font-size: 2.5rem;
    margin-bottom: 2rem;
    color: var(--primary-color);
}

.language-links {
    font-size: 1.5rem;
}

.lang-link {
    text-decoration: none;
    color: #333;
    font-weight: bold;
    padding: 10px 20px;
    border-radius: 5px;
    transition: all 0.3s ease;
}

.lang-link:hover {
    background-color: var(--primary-color);
    color: var(--white);
}

.separator {
    margin: 0 10px;
    color: #999;
}

/* Header & Nav */
header {
    background-color: var(--white);
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 20px;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
}

#main-nav ul {
    list-style: none;
    display: flex;
    gap: 20px;
    margin: 0;
    padding: 0;
}

#main-nav a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    transition: color 0.3s;
}

#main-nav a:hover {
    color: var(--primary-color);
}

.lang-switch {
    border: 1px solid var(--primary-color);
    padding: 5px 10px;
    border-radius: 4px;
    color: var(--primary-color) !important;
}

.lang-switch:hover {
    background-color: var(--primary-color);
    color: var(--white) !important;
}

/* Mobile Menu (CSS Only) */
#menu-toggle {
    display: none;
}

.burger-menu {
    display: none;
    cursor: pointer;
}

.bar {
    width: 25px;
    height: 3px;
    background-color: var(--text-color);
    margin: 5px 0;
    transition: 0.4s;
}

/* Main Content */
.section {
    padding: 4rem 0;
}



h2 {
    color: var(--primary-color);
}

h3 {
    border-bottom: 2px solid var(--primary-color);
    padding-bottom: 10px;
    display: inline-block;
    margin-bottom: 2rem;
}

/* Cards */
.card-grid {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.card {
    background: var(--white);
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s;
}

.card:hover {
    transform: translateY(-5px);
}

.card h4 {
    margin-top: 0;
    color: var(--primary-color);
    font-size: 1.25rem;
    margin-bottom: 1rem;
}

.card h5 {
    font-size: 1.1rem;
    font-weight: bold;
    color: #444;
    margin-top: 1.5rem;
    margin-bottom: 0.8rem;
    border-left: 4px solid var(--primary-color);
    padding-left: 10px;
}

.card h6 {
    font-size: 1rem;
    font-weight: bold;
    margin-top: 1.2rem;
    margin-bottom: 0.5rem;
    color: #555;
}

.card ul {
    padding-left: 20px;
    margin-bottom: 1rem;
}

.card li {
    margin-bottom: 0.5rem;
}

/* Footer */
footer {
    background-color: #333;
    color: #fff;
    text-align: center;
    padding: 2rem 0;
    margin-top: 4rem;
}

/* Responsive */
@media (max-width: 768px) {
    .burger-menu {
        display: block;
        order: 1;
        /* Ensure burger is on the right visually if needed, though flex order handles it */
    }

    .header-container {
        flex-wrap: wrap;
        /* Allow nav to break to new line */
    }

    #main-nav {
        width: 100%;
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.3s ease-out;
        order: 2;
        /* Force nav to be last */
    }

    /* Helper for opening menu */
    #menu-toggle:checked~#main-nav {
        max-height: 300px;
        /* Adjust based on content */
    }

    /* Animate burger icon (optional) */
    #menu-toggle:checked~.burger-menu .bar:nth-child(1) {
        transform: rotate(-45deg) translate(-5px, 6px);
    }

    #menu-toggle:checked~.burger-menu .bar:nth-child(2) {
        opacity: 0;
    }

    #menu-toggle:checked~.burger-menu .bar:nth-child(3) {
        transform: rotate(45deg) translate(-5px, -6px);
    }

    #main-nav ul {
        flex-direction: column;
        width: 100%;
        text-align: center;
        padding: 1rem 0;
        background-color: var(--white);
        border-top: 1px solid #eee;
    }

    #main-nav ul li {
        margin: 10px 0;
    }
}