:root{
    --abyss-950:#04080e;
    --abyss-900:#070f1a;
    --panel:#0e1d31;
    --panel-border: rgba(150,190,230,0.14);
    --signal-blue:#0099ff;
    --signal-cyan:#4fd8ff;
    --amber:#ff9a34;
    --text-hi:#eef4fa;
    --text-mid:#a9b7c9;
    --text-low:#778499;
    --mono: 'SF Mono','Roboto Mono','JetBrains Mono',ui-monospace,Menlo,Consolas,monospace;
    --display: -apple-system, 'Helvetica Neue', Arial, sans-serif;
    --body: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
}
*{ margin:0; padding:0; box-sizing:border-box; }
html{ background:var(--abyss-950); scroll-behavior:smooth; }
body{
    background:
        radial-gradient(ellipse 900px 500px at 15% -10%, rgba(0,153,255,0.16), transparent 60%),
        radial-gradient(ellipse 700px 600px at 100% 20%, rgba(79,216,255,0.08), transparent 55%),
        var(--abyss-950);
    color:var(--text-mid);
    font-family:var(--body);
    line-height:1.65;
    -webkit-font-smoothing:antialiased;
}
a{ color:inherit; }
.wrap{ max-width:1180px; margin:0 auto; padding:0 32px; }

nav{
    position:fixed; top:0; left:0; right:0; z-index:50;
    background:rgba(4,8,14,0.72);
    backdrop-filter: blur(14px) saturate(140%);
    -webkit-backdrop-filter: blur(14px) saturate(140%);
    border-bottom:1px solid var(--panel-border);
}
nav .wrap{ display:flex; align-items:center; justify-content:space-between; height:68px; max-width:1280px; }
.brand{ display:flex; align-items:center; gap:12px; text-decoration:none; }
.brand-mark{ width:34px; height:34px; border-radius:9px; overflow:hidden; box-shadow:0 0 0 1px rgba(255,255,255,0.08), 0 4px 12px -4px rgba(0,0,0,0.6); flex:none; }
.brand-mark img{ width:100%; height:100%; object-fit:cover; }
.brand-word{ font-family:var(--display); font-weight:800; font-size:1.05rem; letter-spacing:0.04em; color:var(--text-hi); }
.brand-word span{ color:var(--signal-cyan); }
.btn{
    display:inline-flex; align-items:center; justify-content:center; gap:8px;
    font-family:var(--body); font-weight:700; font-size:0.92rem; padding:9px 16px;
    border-radius:6px; text-decoration:none; cursor:pointer; border:1px solid transparent;
    background:linear-gradient(135deg, var(--signal-blue), var(--signal-cyan)); color:#04121e;
    transition:transform .15s ease, box-shadow .15s ease;
}
.btn:hover{ transform:translateY(-1px); box-shadow:0 8px 24px -8px rgba(0,153,255,0.7); }

.guide-watermark{
    position:fixed; inset:0; z-index:-1;
    background-image:url('/logo_background.png');
    background-size:52% auto; background-repeat:no-repeat; background-position:center 60%;
    opacity:0.035; pointer-events:none;
}

.guide-shell{ padding:150px 0 100px; position:relative; }

.eyebrow{
    display:inline-flex; align-items:center; gap:8px;
    font-family:var(--mono); font-size:0.76rem; letter-spacing:0.10em; text-transform:uppercase;
    color:var(--signal-cyan); margin-bottom:14px;
}
.eyebrow::before{ content:""; width:7px; height:7px; background:var(--signal-cyan); transform:rotate(45deg); flex:none; }

.guide-header{ max-width:700px; margin:0 auto 48px; text-align:center; }
.guide-header h1{ font-family:var(--display); font-weight:800; letter-spacing:-0.02em; color:var(--text-hi); font-size:clamp(1.9rem,4vw,2.5rem); margin-bottom:14px; line-height:1.15; }
.guide-dek{ font-size:1.02rem; color:var(--text-mid); max-width:56ch; margin:0 auto 16px; }
.guide-meta{ font-family:var(--mono); font-size:0.76rem; color:var(--text-low); }

.guide-body{ max-width:700px; margin:0 auto; font-size:0.98rem; }
.guide-body h2{ font-family:var(--display); font-weight:800; font-size:1.3rem; color:var(--text-hi); margin:42px 0 14px; display:flex; align-items:center; gap:10px; }
.guide-body h2::before{ content:""; width:6px; height:6px; background:var(--amber); transform:rotate(45deg); flex:none; }
.guide-body h3{ font-size:1.05rem; color:var(--text-hi); font-weight:700; margin:24px 0 10px; }
.guide-body p{ margin-bottom:16px; }
.guide-body ul, .guide-body ol{ list-style:none; padding-left:0; margin-bottom:16px; }
.guide-body ol{ counter-reset:g; }
.guide-body ul li{ margin-bottom:9px; padding-left:20px; position:relative; }
.guide-body ul li::before{ content:""; position:absolute; left:2px; top:9px; width:5px; height:5px; background:var(--signal-cyan); border-radius:1px; transform:rotate(45deg); opacity:0.7; }
.guide-body ol li{ counter-increment:g; margin-bottom:12px; padding-left:30px; position:relative; }
.guide-body ol li::before{ content:counter(g); position:absolute; left:0; top:0; font-family:var(--mono); font-size:0.78rem; color:var(--signal-cyan); border:1px solid var(--panel-border); width:20px; height:20px; border-radius:5px; display:flex; align-items:center; justify-content:center; }
.guide-body strong{ color:var(--text-hi); font-weight:600; }
.guide-body a{ color:var(--signal-blue); text-decoration:underline; text-decoration-color:rgba(0,153,255,0.35); text-underline-offset:3px; }
.guide-body a:hover{ color:var(--signal-cyan); }

.guide-example{
    padding:20px 22px; border-radius:10px; border:1px solid var(--panel-border); background:var(--panel);
    margin:22px 0; font-size:0.94rem;
}
.guide-example .guide-example-label{ font-family:var(--mono); font-size:0.72rem; letter-spacing:0.08em; text-transform:uppercase; color:var(--amber); margin-bottom:10px; display:block; }
.guide-example p:last-child{ margin-bottom:0; }

.panel-frame{ border-radius:10px; border:1px solid var(--panel-border); background:var(--panel); overflow:hidden; box-shadow:0 24px 60px -24px rgba(0,0,0,0.75); max-width:100%; margin:26px 0; }
.panel-frame img{ width:100%; display:block; }
.hud-titlebar{ display:flex; align-items:center; justify-content:space-between; padding:9px 14px; border-bottom:1px solid var(--panel-border); font-family:var(--mono); font-size:0.7rem; letter-spacing:0.08em; color:var(--text-low); }
.hud-dots{ display:flex; gap:5px; }
.hud-dots span{ width:6px; height:6px; border-radius:50%; background:rgba(150,190,230,0.25); }
.figure-caption{ font-size:0.82rem; color:var(--text-low); text-align:center; margin-top:-14px; margin-bottom:24px; }

.guide-callout{
    padding:26px 28px; border-radius:12px; border:1px solid rgba(0,153,255,0.28);
    background:linear-gradient(135deg, rgba(0,153,255,0.10), rgba(79,216,255,0.04));
    margin:36px 0 8px;
}
.guide-callout h3{ margin-top:0; color:var(--text-hi); }
.guide-callout p{ margin-bottom:16px; }
.guide-callout .btn{ font-size:0.88rem; padding:8px 15px; }

.guide-faq{ margin-top:36px; }
.guide-faq h2{ margin-top:0; }
.guide-faq-item{ margin-bottom:18px; }
.guide-faq-item h3{ margin:0 0 6px; font-size:0.98rem; }

.related-guides{ max-width:700px; margin:56px auto 0; padding-top:32px; border-top:1px solid var(--panel-border); }
.related-guides h2{ font-size:1rem; color:var(--text-hi); margin-bottom:14px; font-family:var(--display); }
.related-guides ul{ list-style:none; padding:0; display:grid; gap:8px; }
.related-guides a{ color:var(--signal-blue); text-decoration:none; font-size:0.94rem; }
.related-guides a:hover{ color:var(--signal-cyan); }

.back-link{ text-align:center; margin-top:40px; padding-top:32px; border-top:1px solid var(--panel-border); max-width:700px; margin-left:auto; margin-right:auto; }
.back-link a{ color:var(--text-low); text-decoration:none; font-size:0.95rem; }
.back-link a:hover{ color:var(--text-mid); }