/* Main CSS for Symbionet */
:root {
    --primary-orange: #d8986e;
    --primary-brown: #c48b5f;
    --dark-brown: #5d4037;
    --light-bg: rgba(255, 255, 255, 0.92);
    --text-dark: #2d3748;
    --text-light: #666;
    --shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
    --border-radius: 24px;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background: linear-gradient(135deg, var(--primary-orange) 0%, var(--primary-brown) 100%);
    min-height: 100vh;
    color: var(--text-dark);
    line-height: 1.6;
}

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

/* Header */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 0;
    margin-bottom: 2rem;
    border-bottom: 2px solid rgba(255, 255, 255, 0.3);
}

.logo {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.logo-icon {
    width: 48px;
    height: 48px;
    filter: brightness(0) invert(1);
}

.logo h1 {
    font-size: 2rem;
    color: white;
    font-weight: 800;
}

nav ul {
    display: flex;
    list-style: none;
    gap: 1.5rem;
}

nav a {
    color: white;
    text-decoration: none;
    font-weight: 600;
    padding: 0.5rem 1rem;
    border-radius: 12px;
    transition: background 0.3s;
}

nav a:hover {
    background: rgba(255, 255, 255, 0.2);
}

nav a.active {
    background: rgba(255, 255, 255, 0.3);
}

/* Main content */
main {
    background: var(--light-bg);
    border-radius: var(--border-radius);
    padding: 3rem;
    box-shadow: var(--shadow);
    backdrop-filter: blur(10px);
    margin-bottom: 2rem;
}

.hero {
    text-align: center;
    margin-bottom: 3rem;
}

.hero h2 {
    font-size: 2.5rem;
    color: var(--dark-brown);
    margin-bottom: 1rem;
}

.hero p {
    font-size: 1.2rem;
    color: var(--text-light);
    max-width: 800px;
    margin: 0 auto 2rem;
}

.axiom-visualization {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin: 2rem 0;
    padding: 2rem;
    background: linear-gradient(120deg, #f5e6d3 0%, #e8d0b3 100%);
    border-radius: 16px;
}

.axiom-display {
    font-family: 'Courier New', monospace;
    font-size: 3rem;
    font-weight: bold;
    color: var(--dark-brown);
    margin: 1rem 0;
    padding: 1rem 2rem;
    background: white;
    border-radius: 12px;
    border: 3px solid var(--primary-brown);
    user-select: none;
    transition: transform 0.3s;
}

.axiom-display:hover {
    transform: scale(1.05);
}

.axiom-description {
    text-align: center;
    max-width: 600px;
    color: var(--text-dark);
}

/* Sections */
.section-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin: 3rem 0;
}

.section-card {
    background: white;
    border-radius: 16px;
    padding: 2rem;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
    transition: transform 0.3s;
    cursor: pointer;
}

.section-card:hover {
    transform: translateY(-10px);
}

.section-card h3 {
    color: var(--dark-brown);
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

.section-card p {
    color: var(--text-light);
    margin-bottom: 1.5rem;
}

.section-card .progress {
    height: 6px;
    background: #eee;
    border-radius: 3px;
    overflow: hidden;
}

.section-card .progress-bar {
    height: 100%;
    background: var(--primary-orange);
    border-radius: 3px;
}

/* Footer */
footer {
    text-align: center;
    padding: 2rem;
    color: white;
    font-size: 0.9rem;
}

footer a {
    color: white;
    text-decoration: none;
    border-bottom: 1px solid rgba(255, 255, 255, 0.5);
}

footer a:hover {
    border-bottom-color: white;
}

/* Responsive */
@media (max-width: 768px) {
    header {
        flex-direction: column;
        gap: 1rem;
    }
    
    nav ul {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .hero h2 {
        font-size: 2rem;
    }
    
    main {
        padding: 2rem;
    }
}