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

:root {
    /* Dark Mode Theme */
    --bg-dark: #0a0a0a;
    --bg-secondary: #1a1a1a;
    --card-bg: #1e1e1e;
    --text-primary: #e5e5e5;
    --text-secondary: #a3a3a3;
    --accent-color: #10b981; /* Emerald Green */
    --accent-hover: #059669;
    --border-color: #2a2a2a;
    --border-radius: 12px;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-dark);
    background-image: radial-gradient(circle at 25% 25%, rgba(16, 185, 129, 0.05) 0%, transparent 50%),
                      radial-gradient(circle at 75% 75%, rgba(16, 185, 129, 0.03) 0%, transparent 50%);
}

code, pre, .monospace {
    font-family: 'JetBrains Mono', 'Fira Code', 'Courier New', monospace;
}

/* Header & Navigation */
header {
    background: rgba(26, 26, 26, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
}

nav {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--accent-color);
    font-family: 'JetBrains Mono', monospace;
    letter-spacing: -0.5px;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    transition: color 0.3s;
    position: relative;
}

.nav-links a:hover {
    color: var(--accent-color);
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent-color);
    transition: width 0.3s;
}

.nav-links a:hover::after {
    width: 100%;
}

/* Main Content */
main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

/* Hero Section */
.hero {
    text-align: center;
    padding: 6rem 2rem 4rem;
    position: relative;
}

.hero h1 {
    font-size: 3.5rem;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--accent-color) 0%, #34d399 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 700;
}

.hero-subtitle {
    font-size: 1.5rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    font-weight: 300;
}

.hero-description {
    font-size: 1.125rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 2rem;
    line-height: 1.8;
}

/* ORCID Badge */
.orcid-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    background: var(--card-bg);
    border: 2px solid var(--accent-color);
    border-radius: var(--border-radius);
    color: var(--text-primary);
    text-decoration: none;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.95rem;
    font-weight: 600;
    transition: all 0.3s;
    margin-top: 1rem;
}

.orcid-link:hover {
    background: var(--accent-color);
    color: var(--bg-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.3);
}

.orcid-link img {
    width: 20px;
    height: 20px;
}

.orcid-footer {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--accent-color);
    text-decoration: none;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.9rem;
    margin-top: 0.5rem;
    transition: color 0.3s;
}

.orcid-footer:hover {
    color: var(--accent-hover);
}

.orcid-footer img {
    width: 16px;
    height: 16px;
}

/* Tools Section */
.tools-section {
    padding: 3rem 0;
}

.tools-section h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: var(--text-primary);
}

.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
    max-width: 400px;
    margin-left: auto;
    margin-right: auto;
}

.tool-card {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow);
    transition: transform 0.3s, box-shadow 0.3s, border-color 0.3s;
    position: relative;
    overflow: hidden;
}

.tool-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent-color), #34d399);
    transform: scaleX(0);
    transition: transform 0.3s;
}

.tool-card:hover::before {
    transform: scaleX(1);
}

.tool-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 24px rgba(16, 185, 129, 0.2);
    border-color: var(--accent-color);
}

.tool-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.tool-card h3 {
    color: var(--text-primary);
    font-size: 1.5rem;
    margin: 0;
}

.tool-description {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.9rem;
    line-height: 1.6;
}

.badge {
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.badge-alpha {
    background: rgba(239, 68, 68, 0.2);
    color: #ef4444;
    border: 1px solid rgba(239, 68, 68, 0.3);
}

.badge-beta {
    background: rgba(59, 130, 246, 0.2);
    color: #3b82f6;
    border: 1px solid rgba(59, 130, 246, 0.3);
}

.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    background: var(--accent-color);
    color: var(--bg-dark);
    text-decoration: none;
    border: none;
    border-radius: var(--border-radius);
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    transition: all 0.3s;
    width: 100%;
    text-align: center;
}

.btn:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.3);
}

/* About Section */
.about-section {
    padding: 3rem 0;
    text-align: center;
}

.about-section h2 {
    font-size: 2rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.about-section p {
    color: var(--text-secondary);
}

/* Footer */
footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 2rem;
    margin-top: 6rem;
}

.footer-bottom {
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Legal Section (Impressum) */
.legal-section {
    max-width: 800px;
    margin: 0 auto;
    padding: 4rem 2rem;
}

.legal-section h1 {
    font-size: 2.5rem;
    color: var(--text-primary);
    margin-bottom: 2rem;
    background: linear-gradient(135deg, var(--accent-color) 0%, #34d399 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.legal-section h2 {
    font-size: 1.5rem;
    color: var(--accent-color);
    margin-top: 2rem;
    margin-bottom: 1rem;
}

.legal-section h3 {
    font-size: 1.2rem;
    color: var(--text-primary);
    margin-top: 1.5rem;
    margin-bottom: 0.75rem;
}

.legal-section p {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 1rem;
}

.legal-section a {
    color: var(--accent-color);
    text-decoration: none;
    transition: color 0.3s;
}

.legal-section a:hover {
    color: var(--accent-hover);
    text-decoration: underline;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.25rem;
    }
    
    .nav-links {
        gap: 1rem;
    }
    
    .tools-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .modal-content {
        padding: 2rem;
    }
}