/* css/style.css */
:root {
    /* Light Mode (Default) */
    --bg-color: #ffffff;
    --text-primary: #171717;
    --text-secondary: #666666;
    --brand-color: #000000;
    --brand-text: #ffffff;
    --nav-bg: rgba(255, 255, 255, 0.8);
    --border-color: #eaeaea;
    --vignette-rgb: 255, 255, 255;
    --code-bg: #f5f5f5;
}

body.dark-mode {
    /* Dark Mode */
    --bg-color: #0a0a0a;
    --text-primary: #ededed;
    --text-secondary: #a1a1aa;
    --brand-color: #ffffff;
    --brand-text: #000000;
    --nav-bg: rgba(10, 10, 10, 0.8);
    --border-color: #333333;
    --vignette-rgb: 10, 10, 10;
    --code-bg: #1a1a1a;
}

* { margin: 0; padding: 0; box-sizing: border-box; font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; }

body { 
    background-color: var(--bg-color); 
    color: var(--text-primary); 
    line-height: 1.7; 
    font-size: 16px;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* Header & Navigation */
header { 
    position: sticky; top: 0; z-index: 100;
    backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
    background: var(--nav-bg); 
    border-bottom: 1px solid var(--border-color); 
}
.top-bar { 
    background: var(--brand-color); color: var(--brand-text); 
    font-size: 0.75rem; padding: 6px 20px; 
    display: flex; justify-content: space-between; align-items: center; 
    font-weight: 500; letter-spacing: 0.5px;
}
.nav-container { 
    display: flex; justify-content: space-between; align-items: center; 
    padding: 15px 20px; max-width: 800px; margin: 0 auto; 
}
.logo { 
    font-size: 1.25rem; font-weight: 700; color: var(--text-primary); 
    text-decoration: none; letter-spacing: -0.5px;
}

.nav-actions { display: flex; align-items: center; gap: 15px; }
.nav-links { display: flex; gap: 20px; align-items: center; }
.nav-links a { text-decoration: none; color: var(--text-secondary); font-weight: 500; font-size: 0.9rem; transition: color 0.2s; }
.nav-links a:hover { color: var(--text-primary); }

.auth-btn { 
    background: var(--brand-color); color: var(--brand-text) !important; 
    padding: 8px 16px; border-radius: 6px; font-weight: 500; font-size: 0.9rem;
    cursor: pointer; border: 1px solid var(--border-color); transition: opacity 0.2s;
}
.auth-btn:hover { opacity: 0.8; }

.theme-toggle {
    background: none; border: none; font-size: 1.2rem; cursor: pointer;
    color: var(--text-primary); padding: 5px; border-radius: 50%;
    transition: background 0.2s;
}
.theme-toggle:hover { background: var(--border-color); }
.menu-toggle { display: none; font-size: 1.5rem; cursor: pointer; background: none; border: none; color: var(--text-primary); }

/* Continuous Document Flow */
main.document-flow { max-width: 750px; margin: 60px auto; padding: 0 20px; min-height: 70vh; }
.section-marker { 
    font-size: 1.1rem; color: var(--text-primary); 
    margin: 40px 0 20px 0; font-weight: 600; letter-spacing: -0.5px; 
}
.section-marker:first-child { margin-top: 0; }

/* Paywall Vignette System */
.content-wrapper { position: relative; overflow: hidden; }
.paywall-locked { max-height: 500px; }
.vignette-overlay {
    position: absolute; bottom: 0; left: 0; right: 0; height: 300px;
    background: linear-gradient(to bottom, rgba(var(--vignette-rgb), 0) 0%, rgba(var(--vignette-rgb), 1) 80%);
    display: flex; flex-direction: column; justify-content: flex-end; align-items: center;
    padding-bottom: 20px; z-index: 10;
}
.vignette-overlay h3 { font-size: 1.5rem; margin-bottom: 10px; font-weight: 600; letter-spacing: -0.5px;}
.vignette-overlay p { color: var(--text-secondary); margin-bottom: 20px; }
.vignette-overlay.hidden { display: none; }

/* Markdown Typography */
.markdown-body h1, .markdown-body h2, .markdown-body h3 { 
    margin-top: 30px; margin-bottom: 15px; color: var(--text-primary); 
    font-weight: 600; letter-spacing: -0.5px;
}
.markdown-body h1 { font-size: 1.75rem; }
.markdown-body h2 { font-size: 1.4rem; border-bottom: 1px solid var(--border-color); padding-bottom: 8px;}
.markdown-body h3 { font-size: 1.1rem; }
.markdown-body p { margin-bottom: 18px; color: var(--text-secondary); }
.markdown-body strong { color: var(--text-primary); font-weight: 600; }
.markdown-body ul, .markdown-body ol { margin-left: 20px; margin-bottom: 18px; color: var(--text-secondary); }
.markdown-body li { margin-bottom: 8px; }
.markdown-body code { background: var(--code-bg); padding: 2px 6px; border-radius: 4px; font-size: 0.9em; font-family: monospace; }

/* Footer */
footer { border-top: 1px solid var(--border-color); padding: 40px 20px; text-align: center; margin-top: 60px; }
.newsletter-btn { display: inline-block; background: #ff6719; color: white; padding: 12px 24px; border-radius: 6px; text-decoration: none; font-weight: 500; margin-bottom: 30px; transition: opacity 0.2s;}
.newsletter-btn:hover { opacity: 0.9; color: white;}
.footer-links { display: flex; justify-content: center; gap: 20px; font-size: 0.9rem; margin-bottom: 20px;}
.footer-links a { color: var(--text-secondary); text-decoration: none; }
.footer-links a:hover { color: var(--text-primary); }
.disclaimer { font-size: 0.8rem; color: var(--text-secondary); max-width: 750px; margin: 0 auto; text-align: justify; opacity: 0.7;}

/* Mobile Responsive */
@media (max-width: 768px) {
    .nav-links { 
        display: none; position: absolute; top: 100%; left: 0; right: 0; 
        background: var(--bg-color); flex-direction: column; padding: 20px; 
        border-bottom: 1px solid var(--border-color); 
    }
    .nav-links.active { display: flex; }
    .menu-toggle { display: block; }
    main.document-flow { margin: 30px auto; }
    .top-bar { flex-direction: column; gap: 5px; text-align: center; }
}

.social-proof { 
    font-family: monospace;
    opacity: 0.6;          
    font-size: 0.8rem;
    transition: opacity 0.2s;
}

.blog-link {
    font-family: monospace; 
    font-weight: 600;
    opacity: 0.7;         
    color: var(--brand-text);
    text-decoration: none;
    transition: opacity 0.2s;
}

.blog-link:hover {
    opacity: 0.8;
    text-decoration: none;
}