:root {
    /* DRE Style Guide: The Hacker Palette */
    --bg-dark: #080c10;
    --bg-panel: #0d131a;
    --border-color: #30363d;
    --accent-primary: #ffffff;
    --accent-glow: rgba(255, 255, 255, 0.15);
    --accent-cta: #f0883e;
    --text-main: #e6edf3;
    --text-muted: #8b949e;
    --font-sans: 'Inter', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
body {
    background-color: var(--bg-dark);
    color: var(--text-main);
    font-family: var(--font-sans);
    line-height: 1.6;
    overflow-x: hidden;
}

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

/* Focos de luz na interface guiados pelo Style Guide */
body::before {
    content: '';
    position: absolute;
    top: -20%; left: 50%;
    width: 800px; height: 800px;
    transform: translateX(-50%);
    background: radial-gradient(circle, var(--accent-glow) 0%, transparent 60%);
    pointer-events: none;
    z-index: 0;
}

/* Hero Section */
.hero {
    position: relative;
    min-height: 80vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    border-bottom: 1px solid var(--border-color);
    overflow: hidden;
    z-index: 1;
}

.hero .container { position: relative; z-index: 2; }

.author-tag {
    font-family: var(--font-mono);
    color: var(--text-bright);
    letter-spacing: 4px;
    font-size: 0.9rem;
    margin-bottom: 1rem;
    text-transform: uppercase;
}

.hero h1 {
    font-size: 4.5rem;
    font-weight: 800;
    letter-spacing: -2px;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    color: var(--text-main);
}

.hero .subtitle {
    font-size: 1.2rem;
    color: var(--text-muted);
    max-width: 600px;
    margin: 0 auto 2.5rem;
}

.hero-cta {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 1rem 2rem;
    font-family: var(--font-mono);
    text-transform: uppercase;
    text-decoration: none;
    font-weight: 600;
    font-size: 0.9rem;
    letter-spacing: 1px;
    border-radius: 4px;
    transition: all 0.3s ease;
    cursor: pointer;
}

.primary-btn {
    background: var(--accent-cta);
    color: #fff;
    border: 1px solid var(--accent-cta);
    box-shadow: 0 0 20px rgba(240, 136, 62, 0.2);
}

.primary-btn:hover {
    background: #e0742b;
    box-shadow: 0 0 30px rgba(240, 136, 62, 0.4);
}

.secondary-btn {
    background: transparent;
    color: var(--text-bright);
    border: 1px solid var(--text-bright);
}

.secondary-btn:hover {
    background: rgba(255, 255, 255, 0.1);
}

.ghost-btn {
    padding: 0.5rem 1rem;
    font-size: 0.8rem;
    border: 1px solid var(--border-color);
    color: var(--text-muted);
}
.ghost-btn:hover {
    border-color: var(--text-bright);
    color: var(--text-bright);
}

/* Sections */
main { padding: 5rem 0; position: relative; z-index: 1;}
.section-header { margin-bottom: 3rem; }
.section-header h2 {
    font-family: var(--font-mono);
    font-size: 1.5rem;
    color: var(--text-main);
    letter-spacing: 2px;
}
.divider {
    height: 1px;
    background: var(--border-color);
    width: 60px;
    margin-top: 1rem;
}

/* Cards */
.card {
    background: var(--bg-panel);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    position: relative;
    overflow: hidden;
    transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}
.card:hover {
    transform: translateY(-5px);
    border-color: var(--text-bright);
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
}

.bundles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-bottom: 5rem;
}

.bundle-card { padding: 3rem 2rem; text-align: center; }
.bundle-card h3 { font-size: 1.5rem; margin-bottom: 1rem; line-height: 1.3; color: var(--text-main);}
.bundle-card .accent { color: var(--text-muted); font-family: var(--font-mono); font-size: 1rem; font-weight: 400;}
.bundle-card .price { font-size: 2.5rem; font-weight: 800; margin-bottom: 2rem; color: var(--text-bright);}
.bundle-card .btn { width: 100%; }

/* Glassmorphism / Glow */
.bundle-card:hover .card-glow {
    position: absolute;
    top: -50%; left: -50%; width: 200%; height: 200%;
    background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
    opacity: 0.5;
    z-index: 0;
    pointer-events: none;
}
.card-content { position: relative; z-index: 1; }

.chapters-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
}

.chapter-card { padding: 1.5rem; display: flex; flex-direction: column;}
.chap-badge {
    display: inline-block;
    font-family: var(--font-mono);
    color: var(--text-bright);
    font-size: 0.8rem;
    border: 1px solid var(--border-color);
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    margin-bottom: 1rem;
    background: var(--bg-dark);
}
.chapter-card h4 { font-size: 1.1rem; margin-bottom: 2rem; flex-grow: 1; font-weight: 400; color: var(--text-main);}
.chapter-card .card-footer { display: flex; justify-content: space-between; align-items: center; border-top: 1px solid var(--border-color); padding-top: 1rem;}
.chapter-card .price { font-family: var(--font-mono); font-weight: 600; color: var(--text-main);}

/* Footer */
footer {
    border-top: 1px solid var(--border-color);
    padding: 3rem 0;
    margin-top: 4rem;
}
.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--text-muted);
    font-family: var(--font-mono);
    font-size: 0.85rem;
}
.legal-links a { color: var(--text-muted); text-decoration: none; margin-left: 1.5rem; }
.legal-links a:hover { color: var(--text-main); }

@media (max-width: 768px) {
    .hero h1 { font-size: 2.5rem; }
    .hero-cta { flex-direction: column; }
    .footer-content { flex-direction: column; gap: 1rem; text-align: center; }
}