:root{--ink:#0d0e12;--paper:#f7f6f2;--mid:#6b6d76;--accent:#c65a2e;--accent2:#2d6be4;--amazon:#ff9900;--border:rgba(13,14,18,0.10);--card-bg:#ffffff;--display:'DM Serif Display',Georgia,serif;--body:'Inter',system-ui,sans-serif;}
    body.dark{--ink:#f0eeea;--paper:#0f1015;--mid:#8b8d96;--border:rgba(240,238,234,0.08);--card-bg:#1a1c24;}
    *{box-sizing:border-box;margin:0;padding:0;transition:background 0.3s,color 0.2s,border-color 0.2s;}
    body{font-family:var(--body);background:var(--paper);color:var(--ink);min-height:100vh;}
    body::before{content:'';position:fixed;inset:0;background-image:linear-gradient(var(--border) 1px,transparent 1px),linear-gradient(90deg,var(--border) 1px,transparent 1px);background-size:60px 60px;pointer-events:none;z-index:0;}
    .page{position:relative;z-index:1;padding:0 clamp(1.5rem,5vw,4rem);max-width:860px;margin:0 auto;}
    nav{display:flex;align-items:center;justify-content:space-between;padding:1.5rem 0;border-bottom:1px solid var(--border);flex-wrap:wrap;gap:1rem;}
    .logo{font-family:var(--display);font-size:1.5rem;color:var(--ink);text-decoration:none;}
    .logo span{color:var(--accent);}
    .logo small{font-size:0.55rem;color:var(--mid);font-family:var(--body);display:block;letter-spacing:0.08em;text-transform:uppercase;margin-top:-4px;}
    .nav-links{display:flex;gap:1rem;align-items:center;flex-wrap:wrap;}
    .nav-links a{font-size:0.83rem;color:var(--mid);text-decoration:none;}
    .nav-links a:hover{color:var(--accent);}
    .dark-toggle{width:36px;height:36px;border-radius:50%;border:1.5px solid var(--border);background:var(--card-bg);display:flex;align-items:center;justify-content:center;cursor:pointer;font-size:1rem;}
    .article{padding:3rem 0 4rem;}
    .breadcrumb{font-size:0.78rem;color:var(--mid);margin-bottom:1.5rem;}
    .breadcrumb a{color:var(--mid);text-decoration:none;}
    .breadcrumb a:hover{color:var(--accent);}
    .article-tag{font-size:0.72rem;letter-spacing:0.16em;text-transform:uppercase;color:var(--accent);display:inline-flex;align-items:center;gap:0.6rem;margin-bottom:1rem;}
    .article-tag::before{content:'';display:block;width:20px;height:1px;background:var(--accent);}
    h1{font-family:var(--display);font-size:clamp(1.8rem,4vw,2.8rem);line-height:1.15;letter-spacing:-0.02em;margin-bottom:1rem;}
    .article-meta{display:flex;align-items:center;gap:1rem;font-size:0.78rem;color:var(--mid);margin-bottom:2rem;flex-wrap:wrap;}
    .meta-dot{width:4px;height:4px;border-radius:50%;background:var(--mid);}
    .article-intro{font-size:1.05rem;color:var(--mid);line-height:1.8;padding:1.4rem 1.6rem;background:var(--card-bg);border-left:4px solid var(--accent);border-radius:0 0.3rem 0.3rem 0;margin-bottom:2.5rem;}
    h2{font-family:var(--display);font-size:1.5rem;margin:2.5rem 0 0.8rem;}
    h3{font-family:var(--display);font-size:1.15rem;margin:1.8rem 0 0.6rem;}
    p{font-size:0.95rem;color:#3a3b40;line-height:1.85;margin-bottom:1.1rem;}
    body.dark p{color:#b0b2bc;}
    ul,ol{padding-left:1.5rem;margin-bottom:1.2rem;}
    ul li,ol li{font-size:0.95rem;color:#3a3b40;line-height:1.8;margin-bottom:0.5rem;}
    body.dark ul li,body.dark ol li{color:#b0b2bc;}
    .tip-box{background:rgba(45,107,228,0.06);border:1px solid rgba(45,107,228,0.15);border-radius:0.4rem;padding:1.2rem 1.4rem;margin:1.5rem 0;}
    .tip-box strong{display:block;font-size:0.78rem;letter-spacing:0.08em;text-transform:uppercase;color:var(--accent2);margin-bottom:0.5rem;}
    .checklist{background:var(--card-bg);border:1.5px solid var(--border);border-radius:0.4rem;padding:1.4rem 1.6rem;margin:1.5rem 0;}
    .checklist h4{font-size:0.9rem;font-weight:600;margin-bottom:0.8rem;}
    .checklist-item{display:flex;align-items:flex-start;gap:0.6rem;padding:0.4rem 0;border-bottom:1px solid var(--border);font-size:0.88rem;color:#3a3b40;}
    body.dark .checklist-item{color:#b0b2bc;}
    .checklist-item:last-child{border-bottom:none;}
    .check{color:var(--accent);font-weight:700;flex-shrink:0;}
    .divider{height:1px;background:var(--border);margin:2.5rem 0;}
    .related{margin:3rem 0;}
    .related h3{font-family:var(--display);font-size:1.3rem;margin-bottom:1.2rem;}
    .related-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:1rem;}
    .related-card{background:var(--card-bg);border:1.5px solid var(--border);border-radius:0.4rem;padding:1.2rem;text-decoration:none;transition:all 0.15s;}
    .related-card:hover{border-color:var(--accent);transform:translateY(-2px);}
    .related-cat{font-size:0.65rem;letter-spacing:0.1em;text-transform:uppercase;color:var(--accent);margin-bottom:0.4rem;}
    .related-title{font-size:0.9rem;font-weight:600;color:var(--ink);line-height:1.4;}
    footer{padding:1.6rem 0;border-top:1px solid var(--border);margin-top:2rem;display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:1rem;}
    footer p{font-size:0.78rem;color:var(--mid);}
    .footer-links{display:flex;gap:1.2rem;align-items:center;flex-wrap:wrap;}
    .footer-links a{font-size:0.78rem;color:var(--mid);text-decoration:none;}
    .footer-links a:hover{color:var(--accent);}
    .faq-list{margin:1.5rem 0;}
    .faq-item{border-bottom:1px solid var(--border);padding:1.1rem 0;}
    .faq-item:last-child{border-bottom:none;}
    .faq-q{font-weight:600;font-size:0.98rem;color:var(--ink);margin-bottom:0.5rem;}
    .faq-a{font-size:0.9rem;color:#3a3b40;line-height:1.75;margin:0;}
    body.dark .faq-a{color:#b0b2bc;}