/* ===== RESET & BASE ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: #f5faf5;
    color: #1a2e1a;
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* ===== HEADER ===== */
header {
    background: #ffffff;
    color: #1a2e1a;
    padding: 0.8rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 10px rgba(46, 125, 50, 0.08);
    border-bottom: 3px solid #4caf50;
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.logo h1 {
    font-size: 1.3rem;
    font-weight: 700;
    color: #1a2e1a;
    margin-bottom: 0;
}

.logo h1 span {
    color: #4caf50;
}

.tagline {
    font-size: 0.75rem;
    opacity: 0.7;
    color: #388e3c;
    font-weight: 500;
}

nav a {
    color: #1a2e1a;
    margin-left: 1.2rem;
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: color 0.3s;
    padding-bottom: 0.2rem;
    border-bottom: 2px solid transparent;
}

nav a:hover {
    color: #2e7d32;
    border-bottom-color: #66bb6a;
}

/* ===== HERO ===== */
#hero {
    background: linear-gradient(135deg, #e8f5e9 0%, #c8e6c9 40%, #a5d6a7 100%);
    color: #1a2e1a;
    padding: 4rem 0;
    text-align: center;
    border-radius: 0 0 2rem 2rem;
}

.hero-content h2 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

.hero-content .highlight {
    color: #2e7d32;
}

.hero-content p {
    font-size: 1.1rem;
    max-width: 700px;
    margin: 0 auto 1.5rem;
    opacity: 0.85;
}

.badges {
    display: flex;
    justify-content: center;
    gap: 0.8rem;
    flex-wrap: wrap;
}

.badge {
    display: inline-block;
    padding: 0.4rem 1.2rem;
    border-radius: 50px;
    color: white;
    text-decoration: none;
    font-weight: 600;
    font-size: 0.85rem;
    transition: transform 0.3s, box-shadow 0.3s;
    background: rgba(255,255,255,0.3);
    backdrop-filter: blur(4px);
    border: 1px solid rgba(255,255,255,0.4);
}

.badge:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    background: rgba(255,255,255,0.5);
}

.badge.orcid { background: #a6ce39; border-color: #8cb82e; }
.badge.pypi { background: #3775a9; border-color: #2a5f8a; }
.badge.github { background: #333; border-color: #222; }
.badge.docs { background: #5c6bc0; border-color: #4a5aad; }

/* ===== SECTIONS ===== */
section {
    padding: 3rem 0;
}

h3 {
    font-size: 1.6rem;
    margin-bottom: 1.2rem;
    color: #1a2e1a;
    position: relative;
    display: inline-block;
}

h3:after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 60%;
    height: 3px;
    background: linear-gradient(90deg, #66bb6a, #a5d6a7);
    border-radius: 2px;
}

.paper-list {
    background: white;
    border-radius: 1rem;
    padding: 1.2rem 1.5rem;
    box-shadow: 0 2px 8px rgba(46, 125, 50, 0.06);
    border-left: 4px solid #66bb6a;
}

.paper {
    padding: 0.6rem 0;
    border-bottom: 1px solid #e8f5e9;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.paper:last-child {
    border-bottom: none;
}

.paper .year {
    background: linear-gradient(135deg, #66bb6a, #43a047);
    color: white;
    padding: 0.15rem 0.7rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    min-width: 45px;
    text-align: center;
}

.paper a {
    color: #1a2e1a;
    text-decoration: none;
    transition: color 0.3s;
}

.paper a:hover {
    color: #2e7d32;
}

.btn {
    display: inline-block;
    margin-top: 1rem;
    padding: 0.5rem 1.8rem;
    background: linear-gradient(135deg, #66bb6a, #43a047);
    color: white;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
    transition: transform 0.3s, box-shadow 0.3s;
    border: none;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(76, 175, 80, 0.3);
}

/* ===== CONTACT CARDS ===== */
.contact-card {
    background: white;
    padding: 1.5rem;
    border-radius: 1rem;
    border: 1px solid #e8f5e9;
    text-align: center;
    transition: transform 0.3s, box-shadow 0.3s;
}

.contact-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 4px 15px rgba(76, 175, 80, 0.08);
}

.contact-card i {
    font-size: 2rem;
    color: #43a047;
    margin-bottom: 0.5rem;
}

.contact-card h4 {
    margin: 0.5rem 0;
    color: #1a2e1a;
}

.contact-card a {
    color: #2e7d32;
    text-decoration: none;
}

.contact-card a:hover {
    color: #1b5e20;
    text-decoration: underline;
}

/* ===== FOOTER ===== */
footer {
    background: #1a2e1a;
    color: #e8f5e9;
    padding: 1.5rem 0;
    text-align: center;
    font-size: 0.9rem;
    margin-top: 2rem;
}

footer a {
    color: #a5d6a7;
    text-decoration: none;
}

footer a:hover {
    color: #c8e6c9;
    text-decoration: underline;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
    header .container {
        flex-direction: column;
        gap: 0.3rem;
        text-align: center;
    }
    nav a {
        margin: 0 0.6rem;
        font-size: 0.8rem;
    }
    .hero-content h2 {
        font-size: 1.8rem;
    }
    #hero {
        padding: 2.5rem 0;
    }
    .badges {
        gap: 0.4rem;
    }
    .badge {
        padding: 0.3rem 0.8rem;
        font-size: 0.75rem;
    }
    .paper {
        flex-wrap: wrap;
        gap: 0.3rem;
    }
    .contact-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 1rem;
    }
    .hero-content h2 {
        font-size: 1.4rem;
    }
    .logo h1 {
        font-size: 1.1rem;
    }
    .tagline {
        font-size: 0.7rem;
    }
    section {
        padding: 2rem 0;
    }
}