/* ===== Blog In-Con — design system on reference (index-new-theme.html) ===== */
/* 4 themes: dark (terracotta) / light / blue / redblue — vars 1:1 from reference */
html[data-theme="dark"]{
  --bg:#0c0c14;--bg2:#12121e;--bg3:#1a1a2e;--accent:#e8896e;--accent2:#e8a87c;--accent3:#f0c8a0;
  --text:#e8e0d8;--text2:#8a7a72;--border:rgba(232,137,110,0.12);
  --nav-bg:linear-gradient(180deg,rgba(12,12,20,0.92),rgba(12,12,20,0.4));
  --card:#141420;--shape-opacity:.3;--grid-opacity:.03;
  --loader-ico:#e8896e;--shadow:none;--accent-rgb:232,137,110;--code-bg:#1a1a2e;
}
html[data-theme="light"]{
  --bg:#faf7f4;--bg2:#ffffff;--bg3:#f2ede6;--accent:#d97a5c;--accent2:#e8a87c;--accent3:#f5cdb0;
  --text:#2a2119;--text2:#8a7a72;--border:rgba(217,122,92,0.16);
  --nav-bg:linear-gradient(180deg,rgba(250,247,244,0.92),rgba(250,247,244,0.4));
  --card:#ffffff;--shape-opacity:.22;--grid-opacity:.04;
  --loader-ico:#d97a5c;--shadow:0 2px 20px rgba(42,33,25,0.06);--accent-rgb:217,122,92;--code-bg:#f2ede6;
}
html[data-theme="blue"]{
  --bg:#10203c;--bg2:#142848;--bg3:#1a3058;--accent:#5fb4ff;--accent2:#8dccff;--accent3:#c4e3ff;
  --text:#f2f7ff;--text2:#a3b8d6;--border:rgba(95,180,255,0.18);
  --nav-bg:linear-gradient(180deg,rgba(16,32,60,0.92),rgba(16,32,60,0.4));
  --card:#142848;--shape-opacity:.32;--grid-opacity:.05;
  --loader-ico:#5fb4ff;--shadow:none;--accent-rgb:95,180,255;--code-bg:#1a3058;
}
html[data-theme="redblue"]{
  --bg:#f4f7fc;--bg2:#ffffff;--bg3:#e9eff9;--accent:#0a4dd8;--accent2:#e2232f;--accent3:#7aa7f0;
  --text:#131a2e;--text2:#5a6786;--border:rgba(10,77,216,0.16);
  --nav-bg:linear-gradient(180deg,rgba(244,247,252,0.92),rgba(244,247,252,0.4));
  --card:#ffffff;--shape-opacity:.5;--grid-opacity:.05;
  --loader-ico:#0a4dd8;--shadow:0 2px 20px rgba(19,26,46,0.06);--accent-rgb:10,77,216;--code-bg:#e9eff9;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',Arial,sans-serif;background:var(--bg);color:var(--text);line-height:1.7;transition:background .4s,color .4s;-webkit-font-smoothing:antialiased}
a{color:var(--accent);text-decoration:none;transition:color .3s}
a:hover{color:var(--accent2)}
::selection{background:var(--accent);color:#fff}
::-webkit-scrollbar{width:4px;background:var(--bg)}
::-webkit-scrollbar-thumb{background:var(--accent);border-radius:2px}

/* Loader (reference: width animation) */
#loader{position:fixed;inset:0;z-index:9999;background:var(--bg);display:flex;flex-direction:column;align-items:center;justify-content:center;gap:12px;transition:opacity .6s,visibility .6s}
#loader.hidden{opacity:0;visibility:hidden}
.loader-bar{width:160px;height:2px;background:var(--border);border-radius:2px;overflow:hidden}
.loader-bar div{height:100%;width:0;background:linear-gradient(90deg,var(--accent),var(--accent2));border-radius:2px;animation:loadBar 1.8s ease forwards}
@keyframes loadBar{to{width:100%}}
#loader p{font-size:11px;color:var(--text2);letter-spacing:4px;text-transform:uppercase;opacity:0;animation:fadeIn .6s .3s forwards}
@keyframes fadeIn{to{opacity:1}}

/* Nav (reference: gradient to transparent) */
nav{position:fixed;top:0;left:0;right:0;z-index:100;padding:16px 40px;display:flex;justify-content:space-between;align-items:center;background:var(--nav-bg);transition:background .4s}
nav .logo{font-size:18px;font-weight:800;color:var(--text);letter-spacing:-.5px}
nav .logo em{font-style:normal;color:var(--accent)}
nav .nav-links{display:flex;align-items:center;gap:24px}
nav .nav-links a{font-size:12px;color:var(--text2);letter-spacing:2px;text-transform:uppercase}
nav .nav-links a:hover{color:var(--accent)}
nav .nav-links a.active{color:var(--accent)}
.nav-right{display:flex;align-items:center;gap:16px}
@media(max-width:900px){
  nav{padding:12px 20px}
  nav .nav-links{position:fixed;top:0;right:-100%;width:280px;height:100vh;background:var(--bg2);flex-direction:column;padding:80px 30px 30px;gap:16px;transition:right .3s;z-index:99;border-left:1px solid var(--border);align-items:flex-start}
  nav .nav-links.open{right:0}
  .burger{display:block}
}
.burger{display:none;width:28px;height:20px;position:relative;cursor:pointer;border:none;background:none;padding:0}
.burger span{display:block;width:100%;height:2px;background:var(--text);border-radius:1px;position:absolute;left:0;transition:all .3s}
.burger span:nth-child(1){top:0}
.burger span:nth-child(2){top:9px}
.burger span:nth-child(3){top:18px}
.burger.active span:nth-child(1){top:9px;transform:rotate(45deg)}
.burger.active span:nth-child(2){opacity:0}
.burger.active span:nth-child(3){top:9px;transform:rotate(-45deg)}

/* Theme toggle (reference: 3-position style) */
.theme-toggle{display:inline-flex;gap:4px;padding:4px;border:1px solid var(--border);border-radius:20px;background:rgba(128,128,128,0.08);cursor:pointer;transition:background .4s,border-color .3s}
.theme-toggle .tbtn{width:26px;height:26px;border-radius:50%;border:1px solid var(--border);cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all .3s;background:transparent;padding:0}
.theme-toggle .tbtn.active{transform:scale(1.15);box-shadow:0 0 0 2px var(--accent);background:rgba(var(--accent-rgb),0.1)}
.theme-toggle .tbtn .swatch{width:14px;height:14px;border-radius:50%;display:block;border:1px solid rgba(128,128,128,0.4)}
.theme-toggle .tbtn[data-t="dark"] .swatch{background:#0c0c14}
.theme-toggle .tbtn[data-t="light"] .swatch{background:#faf7f4}
.theme-toggle .tbtn[data-t="blue"] .swatch{background:#2a6fd6}
.theme-toggle .tbtn[data-t="redblue"] .swatch{background:linear-gradient(135deg,#f4f7fc 30%,#0a4dd8 30% 62%,#e2232f 62%)}

/* Page hero for articles/catalog */
.page-hero{position:relative;overflow:hidden;padding:150px 40px 60px;background:var(--bg)}
.page-hero .ph-visual{position:absolute;inset:0;overflow:hidden;pointer-events:none}
.page-hero .ph-visual .shape{position:absolute;border-radius:50%;filter:blur(80px);opacity:var(--shape-opacity)}
.page-hero .ph-visual .shape:nth-child(1){width:520px;height:520px;background:var(--accent);top:-22%;right:-8%;animation:float 22s ease-in-out infinite}
.page-hero .ph-visual .shape:nth-child(2){width:340px;height:340px;background:var(--accent2);bottom:-18%;left:-6%;animation:float 28s ease-in-out infinite reverse}
@keyframes float{0%,100%{transform:translate(0,0) scale(1)}33%{transform:translate(40px,-30px) scale(1.1)}66%{transform:translate(-20px,20px) scale(.95)}}
.page-hero .hero-grid{position:absolute;inset:0;background-image:linear-gradient(rgba(var(--accent-rgb),var(--grid-opacity)) 1px,transparent 1px),linear-gradient(90deg,rgba(var(--accent-rgb),var(--grid-opacity)) 1px,transparent 1px);background-size:40px 40px;mask-image:radial-gradient(ellipse 60% 50% at 50% 40%,black 20%,transparent 70%)}
.page-hero .ph-inner{position:relative;z-index:2;max-width:1200px;margin:0 auto}
.page-hero h1{font-size:clamp(34px,5vw,60px);font-weight:900;line-height:1.05;letter-spacing:-2px;color:var(--text);margin-bottom:14px}
.page-hero .ph-sub{font-size:clamp(14px,1.4vw,17px);color:var(--text2);max-width:640px;line-height:1.7}
.tag{display:inline-flex;align-items:center;gap:8px;font-size:10px;color:var(--accent);letter-spacing:3px;text-transform:uppercase;margin-bottom:18px;font-weight:600}
.tag::before{content:'';width:16px;height:1px;background:var(--accent)}

/* ===== Article page ===== */
.art-header{position:relative;overflow:hidden;padding:150px 40px 50px;text-align:left}
.art-header .ph-visual{position:absolute;inset:0;overflow:hidden;pointer-events:none}
.art-header .ph-visual .shape{position:absolute;border-radius:50%;filter:blur(80px);opacity:calc(var(--shape-opacity)*.8)}
.art-header .ph-visual .shape:nth-child(1){width:460px;height:460px;background:var(--accent);top:-25%;right:-8%;animation:float 24s ease-in-out infinite}
.art-header .ph-visual .shape:nth-child(2){width:300px;height:300px;background:var(--accent2);bottom:-25%;left:-8%;animation:float 30s ease-in-out infinite reverse}
.art-header .art-inner{position:relative;z-index:2;max-width:860px;margin:0 auto}
.art-header h1{font-size:clamp(30px,4.5vw,48px);font-weight:900;line-height:1.1;letter-spacing:-1.5px;color:var(--text)}
.art-header .meta{font-size:13px;color:var(--text2);letter-spacing:1px;margin-top:16px;text-transform:uppercase}

article.content{max-width:860px;margin:0 auto;padding:40px 40px 80px;position:relative;z-index:2}
article.content p{margin-bottom:18px;color:var(--text);font-size:16px;line-height:1.75}
article.content h2{font-size:clamp(22px,3vw,30px);font-weight:800;letter-spacing:-1px;line-height:1.2;margin:44px 0 18px;padding-top:8px}
article.content h3{font-size:19px;font-weight:700;margin:30px 0 12px}
article.content h4{font-size:16px;font-weight:700;margin:24px 0 10px;color:var(--text)}
article.content ul,article.content ol{margin:0 0 18px;padding-left:22px}
article.content li{margin-bottom:8px;font-size:15.5px}
article.content li::marker{color:var(--accent)}
article.content strong{font-weight:700;color:var(--text)}
article.content em{font-style:italic}
article.content sub{font-size:.75em}
article.content hr{border:none;border-top:1px solid var(--border);margin:36px 0}
article.content a{border-bottom:1px solid rgba(var(--accent-rgb),.35)}
article.content a:hover{border-bottom-color:var(--accent)}

/* GEO block */
.geo-answer{background:var(--card);border:1px solid var(--border);border-left:3px solid var(--accent);border-radius:0 12px 12px 0;padding:22px 26px;margin:0 0 34px;box-shadow:var(--shadow)}
.geo-answer p{margin:0;font-size:15.5px}
.geo-answer strong{color:var(--accent)}

/* FAQ */
.faq-item{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:18px 24px;margin-bottom:12px}
.faq-item h3{margin:0 0 8px;font-size:15.5px;color:var(--accent);font-weight:700}
.faq-item p{margin:0;font-size:14.5px;color:var(--text2)}

/* Highlight, author, internal links */
.highlight{background:rgba(var(--accent-rgb),0.07);border-radius:8px;padding:2px 6px}
.author{margin-top:44px;padding:22px 26px;background:var(--card);border:1px solid var(--border);border-radius:12px;font-size:14px;color:var(--text2)}
.author strong{color:var(--text)}
.internal-links{display:flex;flex-wrap:wrap;gap:10px;margin:36px 0}
.internal-links a{display:inline-block;font-size:13px;padding:8px 16px;border:1px solid var(--border);border-radius:20px;color:var(--text2);transition:all .3s}
.internal-links a:hover{border-color:var(--accent);color:var(--accent)}

/* Figures, svg, tables */
.svg-wrap,.diagram,.svg-chart,.svg-diagram{margin:28px 0}
.svg-wrap svg,.diagram svg,.svg-chart svg,.svg-diagram svg{max-width:100%;height:auto;display:block;margin:0 auto;background:var(--card);border:1px solid var(--border);border-radius:12px}
figure{margin:28px 0}
figcaption{font-size:13px;color:var(--text2);text-align:center;margin-top:10px}
article.content table{width:100%;border-collapse:collapse;margin:26px 0;font-size:14.5px;background:var(--card);border-radius:12px;overflow:hidden}
article.content th,article.content td{padding:10px 14px;border-bottom:1px solid var(--border);text-align:left}
article.content th{background:rgba(var(--accent-rgb),0.08);font-weight:700;color:var(--accent);font-size:13px;text-transform:uppercase;letter-spacing:.5px}
article.content tr:last-child td{border-bottom:none}

/* Checklist */
.checklist{list-style:none;padding-left:0}
.checklist li{padding-left:28px;position:relative}
.checklist li::before{content:'✓';position:absolute;left:0;color:var(--accent);font-weight:700}

/* ===== Catalog page ===== */
.controls{max-width:1200px;margin:0 auto 30px;display:flex;gap:12px;flex-wrap:wrap;padding:0 40px;position:relative;z-index:2}
@media(max-width:768px){.controls{padding:0 20px}}
.controls input{flex:1;min-width:220px;padding:12px 18px;border:1px solid var(--border);border-radius:10px;font-size:15px;outline:none;background:var(--card);color:var(--text);font-family:inherit;transition:border-color .3s}
.controls input:focus{border-color:var(--accent)}
.controls select{padding:12px 16px;border:1px solid var(--border);border-radius:10px;font-size:14px;background:var(--card);color:var(--text);cursor:pointer;outline:none;font-family:inherit}
#results-info{max-width:1200px;margin:0 auto 12px;padding:0 40px;font-size:13px;color:var(--text2)}
.section{max-width:1200px;margin:0 auto 46px;padding:0 40px}
@media(max-width:768px){.section{padding:0 20px}#results-info{padding:0 20px}}
.section-header{display:flex;align-items:baseline;gap:12px;margin-bottom:18px;padding-bottom:10px;border-bottom:2px solid var(--accent)}
.section-header h2{font-size:clamp(18px,2.4vw,24px);font-weight:800;letter-spacing:-.5px;color:var(--text)}
.section-header .count{font-size:13px;color:var(--text2);font-weight:400}
.articles{display:grid;grid-template-columns:repeat(auto-fill,minmax(340px,1fr));gap:10px 24px}
.articles a{display:block;padding:9px 0;border-bottom:1px solid var(--border);font-size:14px;color:var(--text2);line-height:1.5;transition:color .2s,padding-left .2s}
.articles a:hover{color:var(--accent);padding-left:6px}
.section.hidden{display:none}
.articles a.hidden{display:none}

/* ===== Footer (shared) ===== */
footer{background:var(--bg2);border-top:1px solid var(--border);color:var(--text2);font-size:13px}
.footer-inner{max-width:1200px;margin:0 auto;padding:44px 40px 24px;display:flex;flex-wrap:wrap;gap:32px}
.footer-col{flex:1;min-width:160px}
.footer-logo{font-size:18px;font-weight:800;color:var(--text);margin-bottom:8px}
.footer-logo em{font-style:normal;color:var(--accent)}
.footer-desc{line-height:1.6;color:var(--text2)}
.footer-col h4{font-size:12px;color:var(--accent);margin:0 0 10px;font-weight:700;letter-spacing:1px;text-transform:uppercase}
.footer-col a{display:block;color:var(--text2);padding:3px 0}
.footer-col a:hover{color:var(--accent)}
.footer-contact{padding:3px 0;color:var(--text2)}
.footer-contact a{display:inline;color:var(--accent)}
.footer-bottom{text-align:center;padding:16px 24px;border-top:1px solid var(--border);font-size:12px;color:var(--text2)}

/* Fade-in on scroll */
.fade-in{opacity:0;transform:translateY(24px);transition:opacity .6s ease,transform .6s ease}
.fade-in.v{opacity:1;transform:translateY(0)}

/* Nav container */
.nav-inner{max-width:1200px;margin:0 auto;display:flex;justify-content:space-between;align-items:center;width:100%}