/* ══════════════════════════════════════════════════════════════
   CheckBottleneck v3 — design system
   Dark-first, ultra-clean, minimal. Zero-CLS: system fonts,
   fixed media boxes, theme set before paint via inline script.
   ══════════════════════════════════════════════════════════════ */

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}

:root{
  --bg:#0a0e13;
  --bg-soft:#0d1219;
  --surface:#121826;
  --surface-2:#18202e;
  --border:rgba(148,163,184,.14);
  --border-strong:rgba(148,163,184,.28);
  --text:#e9eef5;
  --muted:#8fa0b5;
  --accent:#00e5a0;
  --accent-ink:#04241a;
  --accent-dim:rgba(0,229,160,.12);
  --blue:#38bdf8;
  --warn:#ffb020;
  --bad:#ff5d5d;
  --good:#00e5a0;
  --radius:14px;
  --radius-sm:10px;
  --font:-apple-system,BlinkMacSystemFont,"Segoe UI",Inter,Roboto,"Helvetica Neue",Arial,sans-serif;
  --mono:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --shadow:0 18px 50px -18px rgba(0,0,0,.55);
  --header-h:64px;
}

[data-theme="light"]{
  --bg:#ffffff;
  --bg-soft:#f7f9fb;
  --surface:#ffffff;
  --surface-2:#f1f5f9;
  --border:#e2e8f0;
  --border-strong:#cbd5e1;
  --text:#0f172a;
  --muted:#5b6b82;
  --accent:#00a86f;
  --accent-ink:#ffffff;
  --accent-dim:rgba(0,168,111,.10);
  --shadow:0 18px 45px -20px rgba(15,23,42,.18);
}

html{scroll-behavior:smooth}
html,body{height:100%}
body{
  font-family:var(--font);
  background:var(--bg);
  color:var(--text);
  line-height:1.6;
  font-size:16px;
  -webkit-font-smoothing:antialiased;
  transition:background .25s ease,color .25s ease;
}
img{max-width:100%;height:auto;display:block}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
::selection{background:var(--accent);color:var(--accent-ink)}

.container{width:100%;max-width:1120px;margin:0 auto;padding:0 20px}
.narrow{max-width:780px}

/* ── Header ─────────────────────────────────────────────────── */
.site-header{
  position:sticky;top:0;z-index:100;
  height:var(--header-h);
  background:color-mix(in srgb,var(--bg) 82%,transparent);
  -webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);
  border-bottom:1px solid var(--border);
}
.header-inner{height:var(--header-h);display:flex;align-items:center;gap:18px}
.site-logo{display:flex;align-items:center;gap:9px;font-weight:800;font-size:19px;color:var(--text);letter-spacing:-.02em}
.site-logo:hover{text-decoration:none}
.site-logo em{font-style:normal;color:var(--accent)}
.logo-dot{width:10px;height:10px;border-radius:50%;background:var(--accent);box-shadow:0 0 12px var(--accent);flex:none}

.main-nav{margin-left:auto;display:flex;align-items:center;gap:4px}
.main-nav a,.main-nav .nav-drop>button{
  color:var(--muted);font-size:14.5px;font-weight:600;padding:9px 12px;border-radius:9px;
  background:none;border:0;cursor:pointer;font-family:inherit;white-space:nowrap;
}
.main-nav a:hover,.main-nav .nav-drop>button:hover{color:var(--text);background:var(--surface-2);text-decoration:none}
.nav-drop{position:relative}
.nav-drop .drop-menu{
  position:absolute;top:calc(100% + 8px);left:0;min-width:250px;
  background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-sm);
  box-shadow:var(--shadow);padding:8px;display:none;
}
.nav-drop.open .drop-menu{display:block}
.drop-menu a{display:block;padding:9px 12px;font-size:14px}
.drop-caret{font-size:10px;margin-left:4px;opacity:.7}

.header-actions{margin-left:8px;display:flex;align-items:center;gap:8px}
.theme-toggle{
  width:40px;height:40px;border-radius:10px;border:1px solid var(--border);
  background:var(--surface);color:var(--text);cursor:pointer;font-size:17px;
  display:flex;align-items:center;justify-content:center;flex:none;
}
.theme-toggle:hover{border-color:var(--border-strong)}
.menu-toggle{display:none;width:40px;height:40px;border-radius:10px;border:1px solid var(--border);background:var(--surface);color:var(--text);font-size:18px;cursor:pointer}

/* ── Hero ───────────────────────────────────────────────────── */
.hero{padding:56px 0 8px;text-align:center}
.hero-badge{
  display:inline-flex;align-items:center;gap:8px;font-size:12.5px;font-weight:700;
  letter-spacing:.08em;text-transform:uppercase;color:var(--accent);
  background:var(--accent-dim);border:1px solid color-mix(in srgb,var(--accent) 35%,transparent);
  padding:7px 14px;border-radius:999px;margin-bottom:18px;
}
.hero h1{font-size:clamp(30px,5vw,46px);line-height:1.12;letter-spacing:-.03em;font-weight:800;max-width:760px;margin:0 auto 14px}
.hero h1 .hl{color:var(--accent)}
.hero-sub{color:var(--muted);font-size:17px;max-width:640px;margin:0 auto 26px}
.hero-stats{display:flex;justify-content:center;gap:34px;flex-wrap:wrap;margin-bottom:8px}
.hstat{text-align:center}
.hstat b{display:block;font-size:21px;font-weight:800;letter-spacing:-.02em}
.hstat span{font-size:12.5px;color:var(--muted)}

/* ── Tool ───────────────────────────────────────────────────── */
.tool-section{padding:26px 0 10px}
.tool-card{
  background:var(--surface);border:1px solid var(--border);border-radius:20px;
  box-shadow:var(--shadow);padding:30px;max-width:880px;margin:0 auto;
}
.tool-head{text-align:center;margin-bottom:24px}
.tool-head h2{font-size:22px;letter-spacing:-.02em;margin-bottom:6px}
.tool-head p{color:var(--muted);font-size:14.5px}
.tool-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-bottom:18px}
.field label{display:flex;align-items:center;gap:7px;font-size:13.5px;font-weight:700;margin-bottom:8px}
.field .q{width:18px;height:18px;border-radius:50%;border:1px solid var(--border-strong);color:var(--muted);font-size:11px;display:inline-flex;align-items:center;justify-content:center;cursor:help;font-weight:700}
select,input[type="text"]{
  width:100%;padding:13px 14px;font-size:15px;font-family:inherit;color:var(--text);
  background:var(--bg-soft);border:1px solid var(--border);border-radius:var(--radius-sm);
  appearance:none;-webkit-appearance:none;min-height:50px;
}
select{background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%238fa0b5' stroke-width='2' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 14px center;padding-right:38px}
select:focus{outline:2px solid var(--accent);outline-offset:1px;border-color:var(--accent)}

.pills-block{margin-bottom:16px}
.pills-label{font-size:12px;font-weight:700;letter-spacing:.07em;text-transform:uppercase;color:var(--muted);margin-bottom:9px;display:block}
.pills{display:flex;flex-wrap:wrap;gap:8px}
.cpill{
  padding:9px 16px;border-radius:999px;border:1px solid var(--border);background:var(--bg-soft);
  color:var(--muted);font-size:13.5px;font-weight:600;cursor:pointer;font-family:inherit;
  min-height:40px;transition:border-color .15s,color .15s,background .15s;
}
.cpill:hover{border-color:var(--border-strong);color:var(--text)}
.cpill.active{background:var(--accent-dim);border-color:var(--accent);color:var(--accent)}

.adv-toggle{
  width:100%;display:flex;align-items:center;justify-content:space-between;
  background:none;border:1px dashed var(--border-strong);border-radius:var(--radius-sm);
  color:var(--muted);font-size:14px;font-weight:600;padding:12px 16px;cursor:pointer;font-family:inherit;margin-bottom:6px;
}
.adv-toggle .chev{transition:transform .2s}
.adv-toggle.open .chev{transform:rotate(180deg)}
.adv-panel{display:none;padding:16px 0 4px}
.adv-panel.open{display:block}
.adv-grid{display:grid;grid-template-columns:1fr 1fr 1fr;gap:16px}

.form-error{
  display:flex;gap:9px;align-items:center;background:rgba(255,93,93,.1);
  border:1px solid rgba(255,93,93,.4);color:#ff8a8a;font-size:14px;font-weight:600;
  border-radius:var(--radius-sm);padding:11px 15px;margin:14px 0 0;
}
[data-theme="light"] .form-error{color:#c2410c;background:rgba(255,93,93,.08)}
[hidden]{display:none !important}

.btn-primary{
  display:inline-flex;align-items:center;justify-content:center;gap:10px;
  background:var(--accent);color:var(--accent-ink);font-weight:800;font-size:16px;
  border:0;border-radius:var(--radius-sm);padding:15px 30px;cursor:pointer;font-family:inherit;
  min-height:54px;transition:transform .12s,filter .15s;width:100%;margin-top:18px;
}
.btn-primary:hover{filter:brightness(1.07)}
.btn-primary:active{transform:scale(.985)}
.btn-ghost{
  display:inline-flex;align-items:center;gap:8px;background:var(--surface-2);color:var(--text);
  border:1px solid var(--border);border-radius:var(--radius-sm);padding:11px 18px;
  font-size:14px;font-weight:700;cursor:pointer;font-family:inherit;min-height:46px;
}
.btn-ghost:hover{border-color:var(--border-strong)}

/* ── Results (revealed on click — no CLS: user-initiated) ───── */
.results{margin-top:26px;border-top:1px solid var(--border);padding-top:24px}
.cstatus{display:flex;gap:13px;align-items:flex-start;border-radius:var(--radius-sm);padding:15px 17px;margin-bottom:20px;font-size:15px}
.cstatus .si{font-size:22px;flex:none}
.cstatus .st{font-weight:700}
.cstatus .st small{display:block;font-weight:400;color:var(--muted);font-size:13.5px;margin-top:2px}
.cstatus.cok{background:rgba(0,229,160,.09);border:1px solid rgba(0,229,160,.35)}
.cstatus.cwarn{background:rgba(255,176,32,.09);border:1px solid rgba(255,176,32,.35)}
.cstatus.cbad{background:rgba(255,93,93,.09);border:1px solid rgba(255,93,93,.35)}

.res-grid{display:grid;grid-template-columns:300px 1fr;gap:22px;margin-bottom:20px}
.gauge-wrap{text-align:center;background:var(--bg-soft);border:1px solid var(--border);border-radius:var(--radius);padding:20px 14px}
.gauge-svg{width:100%;max-width:230px;height:auto;margin:0 auto}
.gauge-val{font-family:var(--mono);font-size:34px;font-weight:800;letter-spacing:-.02em}
.gauge-label{font-size:12px;color:var(--muted);text-transform:uppercase;letter-spacing:.08em;font-weight:700}

.score-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.score-card{background:var(--bg-soft);border:1px solid var(--border);border-radius:var(--radius-sm);padding:16px;text-align:center}
.score-card .sv{font-family:var(--mono);font-size:30px;font-weight:800}
.score-card .sl{font-size:11.5px;color:var(--muted);text-transform:uppercase;letter-spacing:.07em;font-weight:700;margin-top:3px}

.spec-bars{margin-bottom:20px}
.spec-row{display:grid;grid-template-columns:120px 1fr 76px;gap:12px;align-items:center;margin-bottom:10px;font-size:13.5px}
.spec-row .sn{font-weight:700;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.spec-track{height:10px;background:var(--bg-soft);border:1px solid var(--border);border-radius:99px;overflow:hidden}
.spec-fill{height:100%;border-radius:99px;width:0;transition:width .7s cubic-bezier(.2,.7,.3,1)}
.spec-val{font-family:var(--mono);font-size:12.5px;color:var(--muted);text-align:right}

.impact-list{list-style:none;margin-bottom:20px}
.impact-list li{display:grid;grid-template-columns:90px 1fr 64px 74px;gap:12px;align-items:center;padding:9px 0;border-bottom:1px solid var(--border);font-size:14px}
.impact-list li:last-child{border-bottom:0}
.cimp-name{font-weight:700}
.cimp-bg{height:10px;background:var(--bg-soft);border:1px solid var(--border);border-radius:99px;overflow:hidden}
.cimp-fill{height:100%;border-radius:99px;width:0;transition:width .7s cubic-bezier(.2,.7,.3,1)}
.cimp-val{font-family:var(--mono);font-size:12.5px;color:var(--muted)}
.cibadge{font-size:11px;font-weight:800;padding:4px 10px;border-radius:99px;text-align:center}

.duo-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-bottom:20px}
.duo-card{background:var(--bg-soft);border:1px solid var(--border);border-radius:var(--radius-sm);padding:17px}
.duo-card .dk{font-size:10.5px;font-family:var(--mono);letter-spacing:.1em;text-transform:uppercase;color:var(--muted);margin-bottom:9px}
.duo-card .dv{font-size:27px;font-weight:800;font-family:var(--mono)}
.duo-card .dg{font-size:13px;font-weight:700}
.duo-card p{font-size:13.5px;color:var(--muted);margin-top:7px;line-height:1.55}

.rec-list{list-style:none;margin-bottom:20px}
.rec-list li{display:flex;gap:12px;padding:12px 0;border-bottom:1px solid var(--border);font-size:14.5px;line-height:1.55}
.rec-list li:last-child{border-bottom:0}
.rec-list .ri{font-size:18px;flex:none}
.rec-list strong{color:var(--text)}

.result-actions{display:flex;gap:10px;flex-wrap:wrap}
.copy-ok{font-size:13px;color:var(--accent);font-weight:700;align-self:center;opacity:0;transition:opacity .2s}
.copy-ok.show{opacity:1}

/* ── Content sections ───────────────────────────────────────── */
.section{padding:56px 0}
.section-alt{background:var(--bg-soft);border-top:1px solid var(--border);border-bottom:1px solid var(--border)}
.sec-head{text-align:center;max-width:640px;margin:0 auto 34px}
.sec-head h2{font-size:clamp(24px,3.6vw,32px);letter-spacing:-.025em;margin-bottom:10px}
.sec-head p{color:var(--muted)}
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;counter-reset:step}
.step{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:24px;position:relative}
.step .snum{width:38px;height:38px;border-radius:12px;background:var(--accent-dim);color:var(--accent);font-weight:800;display:flex;align-items:center;justify-content:center;margin-bottom:14px;font-size:16px}
.step h3{font-size:16.5px;margin-bottom:8px}
.step p{font-size:14px;color:var(--muted)}
.feat-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.feat{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:24px}
.feat .fi{font-size:26px;margin-bottom:12px}
.feat h3{font-size:16px;margin-bottom:8px}
.feat p{font-size:14px;color:var(--muted)}

/* FAQ */
.faq-list{max-width:760px;margin:0 auto}
.faq-item{border:1px solid var(--border);border-radius:var(--radius-sm);margin-bottom:10px;background:var(--surface);overflow:hidden}
.faq-q{width:100%;display:flex;justify-content:space-between;align-items:center;gap:14px;background:none;border:0;color:var(--text);font-family:inherit;font-size:15.5px;font-weight:700;text-align:left;padding:17px 20px;cursor:pointer}
.faq-q .fx{flex:none;color:var(--accent);font-size:18px;transition:transform .2s}
.faq-item.open .faq-q .fx{transform:rotate(45deg)}
.faq-a{display:none;padding:0 20px 19px;color:var(--muted);font-size:14.5px;line-height:1.65}
.faq-item.open .faq-a{display:block}

.cta-band{text-align:center;padding:64px 0}
.cta-band h2{font-size:clamp(26px,4vw,36px);letter-spacing:-.025em;margin-bottom:12px}
.cta-band p{color:var(--muted);margin-bottom:24px}
.cta-band .btn-primary{width:auto;padding:15px 42px}

/* ── Article / page templates ───────────────────────────────── */
.page-hero{padding:44px 0 6px}
.cbn-crumbs{font-size:13px;color:var(--muted);margin-bottom:14px}
.cbn-crumbs a{color:var(--muted)}
.entry{padding:10px 0 50px}
.entry h1{font-size:clamp(28px,4.4vw,40px);letter-spacing:-.03em;line-height:1.15;margin-bottom:14px}
.entry .entry-meta{color:var(--muted);font-size:13.5px;margin-bottom:22px;display:flex;gap:14px}
.entry .feat-img{border-radius:var(--radius);overflow:hidden;margin-bottom:26px;border:1px solid var(--border);aspect-ratio:16/9;background:var(--surface-2)}
.entry .feat-img img{width:100%;height:100%;object-fit:cover}
.prose{font-size:16.5px;line-height:1.75}
.prose p,.prose ul,.prose ol{margin-bottom:1.15em}
.prose h2{font-size:24px;letter-spacing:-.02em;margin:1.6em 0 .6em}
.prose h3{font-size:19px;margin:1.4em 0 .5em}
.prose ul,.prose ol{padding-left:1.4em}
.prose li{margin-bottom:.4em}
.prose a{font-weight:600}
.prose strong{color:var(--text)}
.prose table{width:100%;border-collapse:collapse;margin-bottom:1.4em;font-size:14.5px}
.prose th,.prose td{border:1px solid var(--border);padding:10px 13px;text-align:left}
.prose th{background:var(--surface-2)}
.rel-wrap{margin-top:44px}
.rel-wrap h2{font-size:20px;margin-bottom:16px}
.rel-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}
.rel-card{display:flex;justify-content:space-between;align-items:center;gap:10px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-sm);padding:15px 18px;font-weight:700;font-size:14.5px;color:var(--text)}
.rel-card:hover{border-color:var(--accent);text-decoration:none}

/* ── 404 ────────────────────────────────────────────────────── */
.e404{text-align:center;padding:90px 0}
.e404 .code{font-family:var(--mono);font-size:90px;font-weight:800;color:var(--accent);line-height:1}
.e404 h1{font-size:28px;margin:14px 0 10px}
.e404 p{color:var(--muted);margin-bottom:26px}

/* ── Footer ─────────────────────────────────────────────────── */
.site-footer{border-top:1px solid var(--border);background:var(--bg-soft);padding:48px 0 0;margin-top:20px}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:30px;margin-bottom:36px}
.foot-brand p{color:var(--muted);font-size:14px;margin-top:12px;max-width:280px}
.foot-col h4{font-size:12px;text-transform:uppercase;letter-spacing:.08em;color:var(--muted);margin-bottom:14px}
.foot-col a{display:block;color:var(--muted);font-size:14px;padding:5px 0}
.foot-col a:hover{color:var(--text)}
.foot-bottom{border-top:1px solid var(--border);padding:20px 0;display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;font-size:13px;color:var(--muted)}

/* ── Archive / search (index.php fallback) ────────────────────── */
.post-list{display:grid;gap:16px}
.post-card{display:grid;grid-template-columns:200px 1fr;gap:20px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:18px;align-items:start}
.post-thumb{display:block;border-radius:var(--radius-sm);overflow:hidden;aspect-ratio:16/10;background:var(--surface-2);border:1px solid var(--border)}
.post-thumb img{width:100%;height:100%;object-fit:cover}
.post-body h2{font-size:19px;letter-spacing:-.01em;margin-bottom:6px;line-height:1.35}
.post-body h2 a{color:var(--text)}
.post-body h2 a:hover{color:var(--accent);text-decoration:none}
.post-body p{color:var(--muted);font-size:14.5px;margin-bottom:10px}
.read-more{font-weight:700;font-size:14px}
.pagination{margin-top:28px;text-align:center}
.pagination .nav-links{display:flex;gap:8px;justify-content:center;flex-wrap:wrap}
.pagination a,.pagination span{padding:9px 15px;border:1px solid var(--border);border-radius:9px;font-size:14px;font-weight:700;color:var(--muted);background:var(--surface)}
.pagination a:hover{color:var(--text);border-color:var(--border-strong);text-decoration:none}
.pagination .current{background:var(--accent-dim);border-color:var(--accent);color:var(--accent)}
@media (max-width:640px){.post-card{grid-template-columns:1fr}.post-thumb{aspect-ratio:16/9}}

/* ── Responsive ─────────────────────────────────────────────── */
@media (max-width:900px){
  .main-nav{display:none;position:absolute;top:var(--header-h);left:0;right:0;background:var(--surface);border-bottom:1px solid var(--border);flex-direction:column;align-items:stretch;padding:12px;gap:2px}
  .main-nav.open{display:flex}
  .main-nav a,.main-nav .nav-drop>button{padding:13px 14px;font-size:15.5px}
  .nav-drop .drop-menu{position:static;box-shadow:none;border:0;background:var(--bg-soft);margin:4px 0 8px}
  .menu-toggle{display:flex;align-items:center;justify-content:center}
  .header-actions{margin-left:auto}
  .tool-grid,.adv-grid,.duo-grid{grid-template-columns:1fr}
  .res-grid{grid-template-columns:1fr}
  .steps,.feat-grid{grid-template-columns:1fr}
  .rel-grid{grid-template-columns:1fr}
  .foot-grid{grid-template-columns:1fr 1fr}
  .tool-card{padding:22px 18px}
  .hero{padding:40px 0 4px}
  .score-cards{grid-template-columns:repeat(3,1fr);gap:8px}
  .score-card{padding:12px 8px}
  .score-card .sv{font-size:24px}
  .impact-list li{grid-template-columns:74px 1fr 56px}
  .impact-list .cibadge{display:none}
  .spec-row{grid-template-columns:96px 1fr 64px}
}
@media (max-width:560px){
  .foot-grid{grid-template-columns:1fr}
  .hero-stats{gap:20px}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{transition:none !important;animation:none !important}
}