/* =========================
   VARIABLES (Custom Properties)
========================= */
:root {
    /* Colors */
    --color-white: #fff;
    --color-black: #000;
    --color-gray-dark: #333;
    --color-gray-light: #666;
    --color-muted-light: #ccc;
    --color-orange: #f8ad35;
    --color-yellow: #f9c310;
    --color-blue: #0088cc;
    --color-footer-bg: #002133;
    /* Font Families */
    --font-body: Arial, sans-serif;
    --font-footer: 'Segoe UI', Arial, sans-serif;
    /* Font Sizes */
    --font-size-logo: 24px;
    --font-size-logo-small: 10px;
    --font-size-nav: 14px;
    --font-size-footer: 14px;
    --font-size-footer-small: 13px;
    --font-size-footer-heading: 16px;
    --font-size-footer-heading-mobile: 14px;
    /* Spacing */
    --space-0: 0;
    --space-5: 5px;
    --space-10: 10px;
    --space-15: 15px;
    --space-20: 20px;
    --space-30: 30px;
    /* Other */
    --border-radius: 4px;
    --logo-height: 50px;
    --button-height: 45px;
}

/* =========================
   BASE STYLES
========================= */
body {
    font-family: var(--font-body);
    margin: 0;
}

/* =========================
   HEADER
========================= */
.main-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-10) var(--space-20);
    background-color: var(--color-white);
    border-bottom: 1px solid #eee;
}

/* Logo */
.logo {
    display: flex;
    align-items: center;
}

    .logo img {
        height: var(--logo-height);
        margin-right: var(--space-10);
    }

.logo-text h1 {
    font-size: var(--font-size-logo);
    margin: 0;
    text-transform: lowercase;
    font-style: italic;
    color: var(--color-gray-dark);
}

.logo-text p {
    font-size: var(--font-size-logo-small);
    margin: 0;
    color: var(--color-gray-light);
}

/* Navigation */
.nav-menu ul {
    list-style: none;
    display: flex;
    gap: var(--space-20);
    margin: var(--space-0);
}

    .nav-menu ul li a {
        text-decoration: none;
        color: var(--color-gray-dark);
        font-size: var(--font-size-nav);
        font-weight: 500;
    }

        .nav-menu ul li a.active {
            color: var(--color-orange);
        }

.nav-menu i {
    font-size: 12px;
    margin-left: 3px;
}

/* Header Actions */
.header-actions {
    display: flex;
    align-items: center;
    gap: var(--space-15);
}

.submit-btn {
    background-color: var(--color-blue);
    color: var(--color-white);
    padding: 8px 15px;
    border-radius: var(--border-radius);
    text-decoration: none;
    font-weight: bold;
    font-size: var(--font-size-nav);
}

.search-btn {
    background: var(--color-black);
    color: var(--color-white);
    border: none;
    padding: 8px 10px;
    border-radius: var(--border-radius);
    cursor: pointer;
}

.lang-selector {
    display: flex;
    gap: var(--space-10);
    font-size: 13px;
    font-weight: bold;
}

.lang-item {
    display: flex;
    align-items: center;
    gap: 5px;
}

    .lang-item img {
        width: 18px;
    }

/* =========================
   ORANGE NAV BAR
========================= */
.orange-bg {
    background-color: var(--color-orange) !important;
    display: block !important;
    width: 100%;
    color: var(--color-white);
    padding: 0 var(--space-30);
}

/* =========================
   FOOTER (MATCHES ARCHIVES PAGE)
========================= */
.main-footer {
    background-color: var(--color-footer-bg);
    color: var(--color-white);
    padding: var(--space-20) 0 var(--space-10);
    font-family: var(--font-footer);
    margin-top: var(--space-30);
}

.footer-logo {
    font-size: 22px;
    font-weight: bold;
    margin-bottom: var(--space-5);
}

.journal-info {
    font-size: var(--font-size-footer-small);
    color: var(--color-muted-light);
    margin-bottom: var(--space-10);
}

.open-access {
    font-size: var(--font-size-footer);
}

.footer-heading {
    font-weight: bold;
    margin-bottom: var(--space-20);
    font-size: var(--font-size-footer-heading);
}

.footer-links {
    list-style: none;
    padding: 0;
}

    .footer-links li {
        margin-bottom: 1px;
    }

    .footer-links a {
        color: var(--color-white);
        text-decoration: none;
        font-size: var(--font-size-footer);
    }

/* Newsletter */
.custom-field {
    background-color: var(--color-white) !important;
    border: none !important;
    height: var(--button-height);
    padding-left: var(--space-20) !important;
    font-size: var(--font-size-nav);
    color: var(--color-gray-dark) !important;
}

.subscribe-btn {
    background-color: var(--color-blue) !important;
    color: var(--color-white) !important;
    font-weight: bold;
    height: var(--button-height);
    border: none;
    letter-spacing: 0.5px;
    cursor: pointer;
}

    .subscribe-btn:hover {
        opacity: 0.9;
    }

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    position: relative;
    margin-top: var(--space-20);
}

.copyright-text {
    font-size: var(--font-size-footer-small);
    color: var(--color-muted-light);
}

.scroll-up-btn {
    position: absolute;
    right: 0;
    bottom: 15px;
    color: var(--color-blue);
    font-size: 18px;
    cursor: pointer;
}

/* =========================
   RESPONSIVE
========================= */
@media screen and (max-width: 768px) {
    .main-header {
        flex-direction: column;
        gap: var(--space-15);
        text-align: center;
        padding: var(--space-15);
    }

    .logo {
        flex-direction: column;
    }

        .logo img {
            margin-right: 0;
            margin-bottom: var(--space-5);
        }

    .nav-menu ul {
        flex-direction: column;
        gap: 10px;
        padding: 0;
        align-items: center;
    }

    .header-actions {
        flex-direction: column;
        width: 100%;
        gap: var(--space-10);
    }

    .submit-btn {
        width: 80%;
        text-align: center;
    }

    .lang-selector {
        justify-content: center;
    }

    .footer-content {
        text-align: center;
    }

    .footer-links {
        margin-bottom: var(--space-20);
    }

    .custom-field,
    .subscribe-btn {
        width: 100% !important;
        margin-bottom: var(--space-10);
    }
}

@media screen and (max-width: 480px) {
    .logo-text h1 {
        font-size: 20px;
    }

    .footer-heading {
        font-size: var(--font-size-footer-heading-mobile);
    }
}