:root {
    --background-color: #121212;
    --surface-color: #1e1e1e;
    --on-surface-color: #e0e0e0;
    --primary-color: #BB86FC;
    --secondary-color: #03DAC6;
    --glow-color: rgba(187, 134, 252, 0.3);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--background-color);
    color: var(--on-surface-color);
    margin: 0;
    line-height: 1.6;
    text-align: center;
    padding: 0 1rem;
}

header, main, footer {
    max-width: 1200px;
    margin: 0 auto;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 0;
    border-bottom: 1px solid #333;
}

h1 {
    font-size: 1.5rem;
    color: var(--primary-color);
}

#lang-toggle button {
    background: none;
    border: 1px solid var(--secondary-color);
    color: var(--secondary-color);
    padding: 0.5rem 1rem;
    cursor: pointer;
    transition: all 0.2s;
    border-radius: 6px;
    margin-left: 0.5rem;
}

#lang-toggle button.active, #lang-toggle button:hover {
    background: var(--secondary-color);
    color: var(--background-color);
}

#hero {
    padding: 5rem 0;
}

#hero h2 {
    font-size: 2.5rem;
    max-width: 800px;
    margin: 0 auto;
}

#guides, #project-guides {
    padding: 2rem 0;
}

#guides h3, #project-guides h3 {
    font-size: 1.8rem;
    color: var(--primary-color);
    margin-bottom: 2rem;
    text-align: left;
}

#mindset-guides-container, #project-guides-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

#guide-content {
    text-align: left;
    max-width: 800px;
    margin: 2rem auto;
    padding: 2rem;
    border: 1px solid #333;
    border-radius: 12px;
    background-color: var(--surface-color);
}

#guide-content h2, #guide-content h3 {
    color: var(--primary-color);
}

#guide-content ul { padding-left: 20px; }
#guide-content li { margin-bottom: 0.5rem; }

#back-button {
    background: var(--secondary-color);
    color: var(--background-color);
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1rem;
    margin-bottom: 2rem;
    transition: background-color 0.2s;
}

#back-button:hover { background-color: #018786; }

footer {
    padding: 2rem 0;
    margin-top: 3rem;
    border-top: 1px solid #333;
    font-size: 0.9rem;
    opacity: 0.7;
}