/* BACKLINK BLUEPRINT — technical blueprint / schematic aesthetic (blueprint navy + cyan) */
:root{
  --blue:#0a2540;--blue-2:#0d2e4f;--blue-deep:#071a2e;--cyan:#3fd0e0;--cyan-2:#7fe3ee;
  --paper:#eaf2f7;--ink:#0a2540;--grid:rgba(127,227,238,.12);--grid-2:rgba(127,227,238,.22);
  --text:#d6e8f0;--text-dim:#8fb0c4;--white:#f4fafd;
}
*{box-sizing:border-box;margin:0;padding:0;}
html{scroll-behavior:smooth;}
body{background:var(--blue);color:var(--text);font-family:"Space Grotesk",Inter,sans-serif;font-size:16px;line-height:1.7;-webkit-font-smoothing:antialiased;
  background-image:linear-gradient(var(--grid) 1px,transparent 1px),linear-gradient(90deg,var(--grid) 1px,transparent 1px);background-size:32px 32px;}
.mono{font-family:"JetBrains Mono",ui-monospace,monospace;}
a{color:var(--cyan);text-decoration:none;}
a:hover{color:var(--cyan-2);}
.wrap{max-width:1120px;margin:0 auto;padding:0 32px;}
.wrap-narrow{max-width:740px;margin:0 auto;padding:0 32px;}

/* Blueprint frame utility */
.bp-frame{border:1px solid var(--grid-2);position:relative;}
.bp-frame::before,.bp-frame::after{content:"+";position:absolute;color:var(--cyan);font-size:16px;line-height:1;}
.bp-frame::before{top:-8px;left:-6px;}
.bp-frame::after{bottom:-10px;right:-6px;}

.tag{font-family:"JetBrains Mono",monospace;font-size:11px;letter-spacing:.2em;text-transform:uppercase;color:var(--cyan);}

/* Nav */
.nav{background:var(--blue-deep);border-bottom:1px solid var(--grid-2);padding:14px 0;position:sticky;top:0;z-index:50;backdrop-filter:blur(10px);}
.nav-inner{display:flex;justify-content:space-between;align-items:center;gap:16px;}
.brand{display:flex;align-items:center;gap:10px;color:var(--white);text-decoration:none;font-weight:700;font-size:18px;letter-spacing:-.01em;}
.brand .mono{color:var(--cyan);font-size:13px;}
.nav-links{display:flex;align-items:center;gap:22px;}
.nav-links a{color:var(--text-dim);font-family:"JetBrains Mono",monospace;font-size:12px;letter-spacing:.06em;}
.nav-links a.active,.nav-links a:hover{color:var(--cyan);}
.nav-cta{background:var(--cyan);color:var(--blue-deep)!important;padding:9px 16px;font-weight:700;border-radius:4px;}
@media(max-width:720px){.nav-links a:not(.nav-cta){display:none;}}

/* Hero */
.hero{padding:80px 0 56px;}
.hero-grid{display:grid;grid-template-columns:1.3fr 1fr;gap:48px;align-items:center;}
@media(max-width:860px){.hero-grid{grid-template-columns:1fr;gap:32px;}}
.hero .tag{margin-bottom:18px;display:inline-block;}
.hero h1{font-size:clamp(40px,5.6vw,76px);font-weight:700;line-height:1.02;letter-spacing:-.03em;color:var(--white);margin-bottom:22px;}
.hero h1 em{font-style:normal;color:var(--cyan);}
.hero p{font-size:18px;color:var(--text-dim);max-width:560px;margin-bottom:14px;}
.hero p strong{color:var(--text);}
.hero-actions{margin-top:30px;display:flex;gap:14px;flex-wrap:wrap;align-items:center;}
.btn{display:inline-flex;align-items:center;gap:10px;background:var(--cyan);color:var(--blue-deep);padding:16px 30px;text-decoration:none;font-weight:700;font-size:15px;border-radius:4px;transition:all .2s ease;}
.btn::after{content:"→";}
.btn:hover{background:var(--cyan-2);transform:translateY(-2px);box-shadow:0 10px 30px rgba(63,208,224,.3);}
.btn-ghost{background:transparent;color:var(--cyan);border:1px solid var(--cyan);}
.btn-ghost:hover{background:rgba(63,208,224,.1);box-shadow:none;}

/* Book schematic */
.book-schematic{padding:24px;}
.book-schematic img{width:100%;max-width:300px;display:block;margin:0 auto;border:1px solid var(--grid-2);box-shadow:0 20px 60px rgba(0,0,0,.4);}
.book-cap{text-align:center;margin-top:14px;font-family:"JetBrains Mono",monospace;font-size:11px;color:var(--text-dim);letter-spacing:.1em;}

/* Section */
.section{padding:80px 0;border-top:1px solid var(--grid-2);}
.section-head{text-align:center;margin-bottom:52px;}
.h2{font-size:clamp(32px,4.2vw,52px);font-weight:700;line-height:1.05;letter-spacing:-.025em;color:var(--white);margin:14px 0 14px;}
.h2 em{font-style:normal;color:var(--cyan);}
.section-sub{font-size:18px;color:var(--text-dim);max-width:680px;margin:0 auto;line-height:1.6;}

/* Schematic steps */
.schema-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;}
@media(max-width:860px){.schema-grid{grid-template-columns:1fr;}}
.node{background:var(--blue-2);border:1px solid var(--grid-2);padding:28px;position:relative;}
.node-id{font-family:"JetBrains Mono",monospace;font-size:11px;color:var(--cyan);letter-spacing:.16em;margin-bottom:16px;border-bottom:1px dashed var(--grid-2);padding-bottom:12px;}
.node h3{font-size:20px;font-weight:700;color:var(--white);letter-spacing:-.01em;margin-bottom:10px;}
.node p{font-size:15px;color:var(--text-dim);line-height:1.6;}

/* Latest */
.latest-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:8px;}
@media(max-width:860px){.latest-grid{grid-template-columns:1fr;}}
.post-card{display:block;text-decoration:none;color:inherit;background:var(--blue-2);border:1px solid var(--grid-2);padding:24px;transition:all .2s ease;}
.post-card:hover{border-color:var(--cyan);transform:translateY(-3px);}
.post-card .meta{font-family:"JetBrains Mono",monospace;font-size:10.5px;letter-spacing:.14em;text-transform:uppercase;color:var(--cyan);margin-bottom:12px;}
.post-card h3{font-size:19px;font-weight:700;color:var(--white);letter-spacing:-.01em;line-height:1.15;margin-bottom:10px;}
.post-card p{font-size:14px;color:var(--text-dim);line-height:1.55;margin-bottom:12px;}
.post-card .more{font-family:"JetBrains Mono",monospace;font-size:11px;color:var(--cyan);letter-spacing:.08em;}

/* Blog index */
.blog-list{padding:40px 0;}
.blog-row{display:grid;grid-template-columns:170px 1fr auto;gap:28px;align-items:start;padding:32px 0;border-bottom:1px solid var(--grid-2);}
@media(max-width:760px){.blog-row{grid-template-columns:1fr;gap:12px;padding:24px 0;}}
.blog-row .date{font-family:"JetBrains Mono",monospace;font-size:12px;color:var(--text-dim);line-height:1.6;}
.blog-row .date strong{display:block;color:var(--cyan);margin-top:6px;font-weight:500;}
.blog-row .body h2{font-size:25px;font-weight:700;color:var(--white);letter-spacing:-.015em;line-height:1.1;margin-bottom:8px;}
.blog-row .body h2 a{color:var(--white);}
.blog-row .body h2 a:hover{color:var(--cyan);}
.blog-row .body p{font-size:15px;color:var(--text-dim);line-height:1.6;}
.blog-row .read{font-family:"JetBrains Mono",monospace;font-size:10.5px;color:var(--text-dim);white-space:nowrap;padding-top:6px;}

/* Article */
.article{padding:48px 0 32px;}
.article-head{text-align:center;padding-bottom:28px;margin-bottom:28px;border-bottom:1px solid var(--grid-2);}
.article-cat{font-family:"JetBrains Mono",monospace;font-size:11px;letter-spacing:.22em;text-transform:uppercase;color:var(--cyan);margin-bottom:16px;}
.article-title-h1{font-size:clamp(34px,4.6vw,60px);font-weight:700;line-height:1.03;letter-spacing:-.025em;color:var(--white);margin-bottom:16px;max-width:880px;margin-left:auto;margin-right:auto;}
.article-title-h1 em{font-style:normal;color:var(--cyan);}
.article-sub{font-size:19px;color:var(--text-dim);max-width:660px;margin:0 auto;line-height:1.5;}
.article-byline{display:inline-flex;align-items:center;gap:12px;margin-top:18px;font-family:"JetBrains Mono",monospace;font-size:12px;color:var(--text-dim);}
.article-byline img{width:40px;height:40px;border-radius:50%;object-fit:cover;border:1px solid var(--cyan);}
.article-byline strong{color:var(--cyan);}
.article-body{max-width:720px;margin:0 auto;font-size:17px;line-height:1.75;}
.article-body p{margin-bottom:18px;color:var(--text);}
.article-body h2{font-size:28px;font-weight:700;letter-spacing:-.02em;line-height:1.12;margin:44px 0 16px;color:var(--white);}
.article-body h2 em{font-style:normal;color:var(--cyan);}
.article-body h3{font-size:21px;font-weight:700;margin:32px 0 12px;color:var(--white);}
.article-body ul,.article-body ol{margin:0 0 18px 22px;}
.article-body li{margin-bottom:8px;color:var(--text);}
.article-body blockquote{border-left:3px solid var(--cyan);background:var(--blue-2);padding:14px 20px;margin:24px 0;color:var(--text-dim);}
.article-body code{font-family:"JetBrains Mono",monospace;background:var(--blue-2);border:1px solid var(--grid-2);padding:2px 7px;border-radius:3px;font-size:.9em;color:var(--cyan);}
.article-body strong{color:var(--white);}

/* In-article CTA */
.article-cta{background:var(--blue-2);border:1px solid var(--cyan);padding:36px;margin:44px 0;text-align:center;position:relative;}
.article-cta .eye{font-family:"JetBrains Mono",monospace;font-size:11px;letter-spacing:.2em;text-transform:uppercase;color:var(--cyan);margin-bottom:10px;}
.article-cta h3{font-size:26px;font-weight:700;color:var(--white);line-height:1.1;margin-bottom:18px;letter-spacing:-.01em;}
.article-cta h3 em{font-style:normal;color:var(--cyan);}
.article-cta img{width:120px;display:block;margin:0 auto 20px;border:1px solid var(--grid-2);}

/* Article author */
.article-author{max-width:720px;margin:44px auto 0;padding:24px;background:var(--blue-2);border:1px solid var(--grid-2);display:grid;grid-template-columns:72px 1fr;gap:18px;align-items:center;}
@media(max-width:640px){.article-author{grid-template-columns:1fr;text-align:center;}}
.article-author img{width:72px;height:72px;border-radius:50%;object-fit:cover;border:1px solid var(--cyan);margin:0 auto;}
.article-author h4{font-size:17px;font-weight:700;color:var(--white);margin-bottom:2px;}
.article-author p{font-size:13.5px;color:var(--text-dim);line-height:1.5;}

/* Related */
.related{padding:44px 0;border-top:1px solid var(--grid-2);}
.related-head{text-align:center;font-family:"JetBrains Mono",monospace;font-size:11px;letter-spacing:.2em;text-transform:uppercase;color:var(--cyan);margin-bottom:28px;}

/* About */
.about-block{background:var(--blue-2);border:1px solid var(--grid-2);padding:32px;display:grid;grid-template-columns:200px 1fr;gap:28px;align-items:start;}
@media(max-width:640px){.about-block{grid-template-columns:1fr;text-align:center;}}
.about-block .photo{width:200px;height:240px;border:1px solid var(--cyan);overflow:hidden;margin:0 auto;}
.about-block .photo img{width:100%;height:100%;object-fit:cover;}
.about-block h3{font-size:28px;font-weight:700;color:var(--white);margin-bottom:4px;letter-spacing:-.01em;}
.about-block .role{font-family:"JetBrains Mono",monospace;font-size:12px;color:var(--cyan);margin-bottom:14px;letter-spacing:.06em;}
.about-block p{font-size:15px;color:var(--text-dim);line-height:1.65;margin-bottom:10px;}

/* Footer */
.foot{background:var(--blue-deep);border-top:1px solid var(--grid-2);padding:48px 0 28px;margin-top:64px;font-size:13px;color:var(--text-dim);}
.foot-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:32px;margin-bottom:32px;}
@media(max-width:760px){.foot-grid{grid-template-columns:1fr;}}
.foot h4{font-family:"JetBrains Mono",monospace;font-size:11px;letter-spacing:.18em;text-transform:uppercase;color:var(--cyan);margin-bottom:14px;}
.foot a{display:block;color:var(--text-dim);padding:4px 0;}
.foot a:hover{color:var(--cyan);}
.foot-bottom{padding-top:24px;border-top:1px solid var(--grid-2);display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;font-size:11.5px;}