* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

:root {
    --primary-color: rgb(91, 121, 157);
    --secondary-color: #f0f5ff;
    --text-color: #333;
    --light-text: #666;
    --light-gray: #f9f9f9;
    --white: #ffffff;
}

body {
    background-color: var(--white);
    color: var(--text-color);
    line-height: 1.6;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 20px;
}

header { padding: 20px 0; text-align: center; }

.logo {
    font-size: 32px;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 10px;
    text-transform: uppercase;
}

.logo a { color: inherit; text-decoration: none; }

.tagline { font-size: 16px; color: var(--light-text); margin-bottom: 10px; }
.scientific-source { font-size: 14px; color: var(--primary-color); margin-bottom: 20px; font-weight: 500; }
.comment-invite { font-size: 14px; color: var(--light-text); margin-bottom: 25px; font-style: italic; }

.divider { height: 2px; background-color: var(--primary-color); margin: 20px 0; }
.thin-divider { height: 1px; background-color: var(--primary-color); margin: 15px 0; opacity: 0.5; }

.subscribe-container { margin: 25px 0 35px 0; text-align: center; }

.subscribe-btn, .btn {
    display: inline-block;
    background-color: var(--primary-color);
    color: white;
    padding: 12px 35px;
    border: none;
    border-radius: 4px;
    font-size: 16px;
    font-weight: 600;
    text-decoration: none;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    cursor: pointer;
    transition: background-color 0.3s;
    margin-bottom: 10px;
}

.subscribe-btn:hover, .btn:hover { background-color: rgb(71, 101, 137); }

.btn-danger { background-color: #b34a4a; }
.btn-danger:hover { background-color: #8f3a3a; }
.btn-secondary { background-color: var(--light-text); }
.btn-secondary:hover { background-color: #4d4d4d; }

.newsletter-text { font-size: 14px; color: var(--light-text); }

.articles-container { padding: 20px 0 40px 0; }

.article { margin-bottom: 50px; }

.article-date { color: var(--light-text); font-size: 14px; margin-bottom: 15px; display: block; }

.article-img-container {
    width: 100%;
    overflow: hidden;
    margin: 15px 0 20px 0;
    border: 2px solid var(--primary-color);
}

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

.article-title {
    font-size: 24px;
    margin: 20px 0 15px 0;
    color: var(--primary-color);
    line-height: 1.3;
    text-transform: uppercase;
}

.article-content p { margin-bottom: 15px; font-size: 16px; color: var(--text-color); }

.author-section { margin-top: 50px; padding-top: 20px; }
.author-title { font-size: 18px; margin-bottom: 20px; color: var(--primary-color); font-weight: 600; }
.author-info { line-height: 1.8; }
.author-name { font-size: 16px; font-weight: 600; margin-bottom: 5px; }
.author-credentials { color: var(--text-color); font-size: 15px; margin-bottom: 8px; }

footer {
    background-color: var(--primary-color);
    color: white;
    padding: 30px 0;
    text-align: center;
    margin-top: 40px;
}

.footer-logo { font-size: 22px; font-weight: 700; margin-bottom: 15px; text-transform: uppercase; }
.footer-tagline { font-size: 14px; margin-bottom: 20px; opacity: 0.9; }
.copyright { padding-top: 20px; border-top: 1px solid rgba(255, 255, 255, 0.2); margin-top: 20px; font-size: 14px; }

/* ---------- Admin ---------- */
.admin-bar {
    background: #222;
    color: #fff;
    padding: 10px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 14px;
}
.admin-bar a { color: #fff; text-decoration: none; margin-left: 15px; }
.admin-bar a:hover { text-decoration: underline; }

.admin-container { max-width: 700px; margin: 40px auto; padding: 0 20px; }

.login-box {
    max-width: 380px;
    margin: 80px auto;
    padding: 30px;
    border: 2px solid var(--primary-color);
    text-align: center;
}

.form-group { margin-bottom: 18px; text-align: left; }
.form-group label { display: block; font-weight: 600; margin-bottom: 6px; color: var(--text-color); }
.form-group input[type=text],
.form-group input[type=password],
.form-group input[type=date],
.form-group input[type=file],
.form-group textarea {
    width: 100%;
    padding: 10px;
    border: 1px solid #ccc;
    font-size: 15px;
    font-family: inherit;
}
.form-group textarea { min-height: 180px; resize: vertical; }

.article-list-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 0;
    border-bottom: 1px solid #eee;
}
.article-list-item .actions a { margin-left: 10px; font-size: 14px; }

.alert {
    padding: 12px 15px;
    margin-bottom: 20px;
    border-radius: 4px;
    font-size: 14px;
}
.alert-success { background: #e2f5e9; color: #1e6b3c; border: 1px solid #b7e4c7; }
.alert-error { background: #fbe4e4; color: #8f3a3a; border: 1px solid #f0b8b8; }

@media (max-width: 768px) {
    .logo { font-size: 28px; }
    .article-title { font-size: 20px; }
    .subscribe-btn, .btn { padding: 10px 25px; font-size: 15px; }
}