/* ============ TOKENS — "Signal" design system ============ */
:root{
  --bg:#05070f;
  --panel-top:rgba(17,26,48,.88);
  --panel-bot:rgba(9,14,28,.94);
  --head-bg:rgba(10,16,32,.72);
  --border:#1c2b4a;
  --border-hi:#2c4470;
  --text:#e7eefb;
  --text-dim:#94a6c6;
  --text-faint:#5c6e92;
  --cyan:#22d3ee;
  --blue:#3b82f6;
  --violet:#a78bfa;
  --green:#4ade80;
  --rose:#fb7185;
  --amber:#fbbf24;
  --grad:linear-gradient(135deg,#22d3ee 0%,#3b82f6 55%,#8b5cf6 100%);
  --mono:ui-monospace,'JetBrains Mono','Cascadia Code','Fira Code',Menlo,Consolas,monospace;
  --sans:'Space Grotesk',ui-sans-serif,system-ui,-apple-system,'Segoe UI',Roboto,Helvetica,Arial,sans-serif;
  --radius:14px;
  --shadow:0 18px 44px -18px rgba(2,6,18,.85);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  background:
    radial-gradient(1000px 480px at 12% -6%, rgba(59,130,246,.16), transparent 62%),
    radial-gradient(900px 520px at 92% -4%, rgba(139,92,246,.13), transparent 60%),
    radial-gradient(700px 700px at 50% 115%, rgba(34,211,238,.07), transparent 60%),
    var(--bg);
  color:var(--text);
  font-family:var(--sans);
  line-height:1.6;
  min-height:100vh;
  padding-bottom:110px; /* room for sticky anchor ad */
}
/* oscilloscope grid backdrop */
body::before{
  content:"";position:fixed;inset:0;pointer-events:none;z-index:0;
  background:
    linear-gradient(rgba(120,150,220,.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(120,150,220,.05) 1px, transparent 1px);
  background-size:44px 44px;
  -webkit-mask-image:radial-gradient(80% 55% at 50% 0%, #000 0%, transparent 100%);
  mask-image:radial-gradient(80% 55% at 50% 0%, #000 0%, transparent 100%);
}
header.site,.shell{position:relative;z-index:1}
::selection{background:rgba(34,211,238,.28)}
a{color:var(--cyan)}
button{font-family:inherit;cursor:pointer}

/* ============ LAYOUT SHELL ============ */
.shell{max-width:1440px;margin:0 auto;padding:0 16px}
.with-sidebar{display:grid;grid-template-columns:1fr;gap:24px}
@media(min-width:1200px){.with-sidebar{grid-template-columns:minmax(0,1fr) 320px}}

/* ============ HEADER ============ */
header.site{
  padding:26px 0 20px;position:relative;
}
header.site::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:1px;
  background:linear-gradient(90deg,transparent,rgba(34,211,238,.45) 20%,rgba(139,92,246,.45) 80%,transparent);
}
.brand-row{display:flex;flex-wrap:wrap;align-items:center;gap:16px;justify-content:space-between}
.brand{display:flex;align-items:center;gap:14px}
.pulse-mark{
  width:48px;height:48px;flex:none;border-radius:13px;position:relative;
  background:linear-gradient(160deg,#101a35,#0a1024);
  border:1px solid var(--border-hi);
  display:grid;place-items:center;overflow:hidden;
  box-shadow:0 0 22px -4px rgba(34,211,238,.35), inset 0 1px 0 rgba(255,255,255,.06);
}
.pulse-mark::after{
  content:"";position:absolute;inset:0;border-radius:13px;padding:1px;
  background:var(--grad);opacity:.55;
  -webkit-mask:linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite:xor;mask-composite:exclude;pointer-events:none;
}
.pulse-mark svg{width:36px;height:20px}
.pulse-line{stroke:var(--cyan);stroke-width:2.2;fill:none;stroke-linecap:round;stroke-linejoin:round;
  filter:drop-shadow(0 0 4px rgba(34,211,238,.8));
  stroke-dasharray:120;stroke-dashoffset:120;animation:ekg 2.6s linear infinite}
@keyframes ekg{0%{stroke-dashoffset:120;opacity:0}8%{opacity:1}70%{stroke-dashoffset:0;opacity:1}100%{stroke-dashoffset:0;opacity:0}}
@media(prefers-reduced-motion:reduce){.pulse-line{animation:none;stroke-dashoffset:0}}
h1.logo{font-size:1.6rem;font-weight:700;letter-spacing:-.03em;line-height:1.15}
h1.logo .fp2{
  background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent;
}
.tagline{color:var(--text-dim);font-size:.86rem;margin-top:2px;letter-spacing:.01em}
.badges{display:flex;gap:8px;flex-wrap:wrap}
.badge{
  font-size:.68rem;font-weight:600;letter-spacing:.14em;text-transform:uppercase;color:var(--text-dim);
  border:1px solid var(--border);border-radius:999px;padding:5px 13px;
  background:linear-gradient(180deg,rgba(20,30,56,.7),rgba(10,16,32,.7));
}
.badge b{color:var(--green);font-weight:700;text-shadow:0 0 6px rgba(74,222,128,.7)}

/* format pills — segmented control */
.format-bar{
  display:inline-flex;flex-wrap:wrap;gap:4px;margin-top:18px;
  padding:5px;border-radius:14px;border:1px solid var(--border);
  background:linear-gradient(180deg,rgba(13,20,40,.85),rgba(8,12,26,.85));
}
.pill{
  border:1px solid transparent;background:transparent;color:var(--text-dim);
  padding:7px 16px;border-radius:10px;font-size:.85rem;font-weight:600;letter-spacing:.01em;
  transition:color .15s ease,background .15s ease,box-shadow .15s ease;
}
.pill:hover{color:var(--text);background:rgba(59,130,246,.12)}
.pill.active{
  background:var(--grad);color:#04101c;font-weight:700;
  box-shadow:0 4px 16px -4px rgba(56,140,246,.55), inset 0 1px 0 rgba(255,255,255,.28);
}
.pill:focus-visible,button:focus-visible,select:focus-visible,textarea:focus-visible{outline:2px solid var(--cyan);outline-offset:2px}

/* ============ ADSENSE PLACEHOLDERS ============ */
.adsense-placeholder{
  border:1.5px dashed #2c3d64;border-radius:var(--radius);
  background:
    linear-gradient(180deg,rgba(23,34,62,.30),rgba(14,21,42,.30));
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:4px;
  color:var(--text-faint);font-size:.72rem;letter-spacing:.16em;text-transform:uppercase;font-weight:600;
}
.adsense-placeholder small{font-size:.67rem;letter-spacing:.05em;text-transform:none;font-weight:400;color:#48587a}
.ad-top{max-width:728px;height:90px;margin:24px auto}
.ad-mid{height:100px;margin:6px 0}
.ad-side{width:300px;height:600px;position:sticky;top:20px;margin:0 auto}
.sidebar-col{display:none}
@media(min-width:1200px){.sidebar-col{display:block;padding-top:24px}}
.ad-anchor{
  position:fixed;left:0;right:0;bottom:0;z-index:60;
  background:rgba(5,7,15,.9);backdrop-filter:blur(10px);
  border-top:1px solid var(--border);
  display:flex;justify-content:center;align-items:center;padding:8px 44px 8px 8px;
}
.ad-anchor::before{
  content:"";position:absolute;top:-1px;left:0;right:0;height:1px;
  background:linear-gradient(90deg,transparent,rgba(34,211,238,.4),transparent);
}
.ad-anchor .adsense-placeholder{width:728px;height:90px;max-width:100%}
@media(max-width:768px){.ad-anchor .adsense-placeholder{width:320px;height:50px}}
.ad-anchor-close{
  position:absolute;right:10px;top:50%;transform:translateY(-50%);
  width:28px;height:28px;border-radius:50%;border:1px solid var(--border-hi);
  background:var(--panel-bot);color:var(--text-dim);font-size:.9rem;line-height:1;
}
.ad-anchor-close:hover{color:var(--text);border-color:var(--cyan)}

/* ============ WORKSPACE ============ */
.workspace{
  display:grid;gap:20px;margin-top:8px;
  grid-template-areas:"input" "midad" "output";
}
@media(min-width:900px){
  .workspace{grid-template-columns:1fr 1fr;grid-template-areas:"input output" "midad midad"}
}
.panel{
  grid-area:input;position:relative;
  background:linear-gradient(180deg,var(--panel-top),var(--panel-bot));
  border:1px solid var(--border);border-radius:var(--radius);
  display:flex;flex-direction:column;overflow:hidden;min-height:460px;
  box-shadow:var(--shadow);
}
.panel::before{ /* top accent strip */
  content:"";position:absolute;top:0;left:0;right:0;height:2px;z-index:6;
  background:linear-gradient(90deg,var(--violet),var(--blue));opacity:.85;
}
.panel.output-panel{grid-area:output;transition:box-shadow .3s ease,border-color .3s ease}
.panel.output-panel::before{background:linear-gradient(90deg,var(--blue),var(--cyan),var(--green))}
.mid-ad-area{grid-area:midad}
.panel-head{
  display:flex;align-items:center;justify-content:space-between;gap:8px;flex-wrap:wrap;
  padding:11px 14px;border-bottom:1px solid var(--border);background:var(--head-bg);
}
.panel-title{display:flex;align-items:center;gap:9px;font-size:.74rem;font-weight:700;letter-spacing:.18em;text-transform:uppercase;color:var(--text-dim)}
.dot{width:8px;height:8px;border-radius:50%}
.dot.in{background:var(--violet);box-shadow:0 0 8px rgba(167,139,250,.9)}
.dot.out{background:var(--green);box-shadow:0 0 8px rgba(74,222,128,.9)}
.head-actions{display:flex;gap:6px;flex-wrap:wrap}
.btn{
  display:inline-flex;align-items:center;gap:6px;
  border:1px solid var(--border);background:rgba(16,25,48,.75);color:var(--text-dim);
  font-size:.78rem;font-weight:600;padding:6px 12px;border-radius:9px;
  transition:all .15s ease;
}
.btn:hover{color:var(--text);border-color:var(--border-hi);transform:translateY(-1px)}
.btn.primary{background:var(--grad);border-color:transparent;color:#04101c}
.btn.ghost-green:hover{border-color:var(--green);color:var(--green)}
.btn.ghost-rose:hover{border-color:var(--rose);color:var(--rose)}
select.ctrl{
  border:1px solid var(--border);background:rgba(16,25,48,.9);color:var(--text-dim);
  font-size:.78rem;font-weight:600;padding:6px 8px;border-radius:9px;
}

/* editor bodies */
.editor-body{position:relative;flex:1;display:flex;min-height:0}
.gutter{
  flex:none;width:52px;overflow:hidden;text-align:right;user-select:none;
  padding:14px 10px 14px 0;font-family:var(--mono);font-size:.8rem;line-height:1.55;
  color:#3d5178;background:rgba(4,8,18,.55);border-right:1px solid var(--border);white-space:pre;
}
textarea#input{
  flex:1;resize:none;border:none;background:transparent;color:var(--text);
  font-family:var(--mono);font-size:.8rem;line-height:1.55;padding:14px;
  min-height:380px;white-space:pre;overflow:auto;
}
textarea#input::placeholder{color:#41527a}
pre#output{
  flex:1;margin:0;padding:14px;overflow:auto;font-family:var(--mono);
  font-size:.8rem;line-height:1.55;white-space:pre;color:var(--text);min-height:380px;
}
.dropzone-active{outline:2px dashed var(--cyan);outline-offset:-8px;background:rgba(34,211,238,.05)}

/* floating output buttons */
.float-actions{position:absolute;top:10px;right:14px;display:flex;gap:6px;z-index:5;opacity:.94}
.float-btn{
  border:1px solid var(--border-hi);background:rgba(5,7,15,.85);backdrop-filter:blur(6px);
  color:var(--text-dim);font-size:.74rem;font-weight:600;padding:6px 11px;border-radius:9px;
}
.float-btn:hover{color:#fff;border-color:var(--cyan);box-shadow:0 0 12px -3px rgba(34,211,238,.6)}

/* status + validation */
.statusbar{
  display:flex;justify-content:space-between;gap:10px;flex-wrap:wrap;
  padding:7px 14px;border-top:1px solid var(--border);font-size:.72rem;color:var(--text-faint);
  font-family:var(--mono);background:rgba(4,8,18,.4);
}
.msg{display:none;margin:0 0 14px;padding:10px 14px;border-radius:11px;font-size:.83rem;font-family:var(--mono);border:1px solid}
.msg.err{display:block;background:rgba(251,113,133,.09);border-color:rgba(251,113,133,.45);color:var(--rose)}
.msg.ok{display:block;background:rgba(74,222,128,.08);border-color:rgba(74,222,128,.4);color:var(--green)}

/* success flash — the pulse */
@keyframes flashPulse{
  0%{box-shadow:var(--shadow),0 0 0 0 rgba(74,222,128,0);border-color:var(--border)}
  25%{box-shadow:var(--shadow),0 0 0 4px rgba(74,222,128,.4),0 0 34px -6px rgba(74,222,128,.55);border-color:var(--green)}
  100%{box-shadow:var(--shadow),0 0 0 0 rgba(74,222,128,0);border-color:var(--border)}
}
.flash-success{animation:flashPulse .9s ease}
@media(prefers-reduced-motion:reduce){.flash-success{animation:none;border-color:var(--green)}}

/* toast */
#toast{
  position:fixed;bottom:120px;left:50%;transform:translateX(-50%) translateY(12px);
  background:rgba(8,14,28,.95);border:1px solid var(--green);color:var(--green);
  padding:9px 18px;border-radius:999px;font-size:.82rem;font-weight:600;
  box-shadow:0 0 24px -6px rgba(74,222,128,.5);
  opacity:0;pointer-events:none;transition:all .25s ease;z-index:80;
}
#toast.show{opacity:1;transform:translateX(-50%) translateY(0)}

/* action bar under header */
.action-row{display:flex;flex-wrap:wrap;gap:10px;align-items:center;margin:20px 0 14px}
.action-row .spacer{flex:1}
.big-btn{
  font-size:.9rem;font-weight:700;padding:11px 24px;border-radius:11px;border:1px solid transparent;
  letter-spacing:.01em;transition:transform .15s ease,box-shadow .15s ease,background .15s ease;
}
.big-btn:active{transform:translateY(1px)}
.big-btn.beautify{
  background:var(--grad);color:#04101c;
  box-shadow:0 8px 24px -8px rgba(56,140,246,.65), inset 0 1px 0 rgba(255,255,255,.3);
}
.big-btn.beautify:hover{transform:translateY(-1px);box-shadow:0 12px 30px -8px rgba(56,140,246,.8), inset 0 1px 0 rgba(255,255,255,.3)}
.big-btn.minify{background:rgba(139,92,246,.09);border-color:rgba(167,139,250,.55);color:#c9b8fd}
.big-btn.minify:hover{background:rgba(139,92,246,.18);box-shadow:0 6px 18px -8px rgba(139,92,246,.6)}
.big-btn.validate{background:transparent;border-color:var(--border-hi);color:var(--text-dim)}
.big-btn.validate:hover{border-color:var(--green);color:var(--green);box-shadow:0 6px 18px -10px rgba(74,222,128,.55)}
.indent-group{display:flex;align-items:center;gap:8px;font-size:.8rem;color:var(--text-dim)}

/* ============ SEO CONTENT ============ */
.seo{margin:58px 0 30px}
.seo h2{
  font-size:1.4rem;font-weight:700;letter-spacing:-.02em;margin:36px 0 10px;color:#f2f6ff;
  display:flex;align-items:center;gap:12px;
}
.seo h2::before{content:"";width:22px;height:2px;border-radius:2px;background:var(--grad);flex:none}
.seo h3{font-size:1.02rem;font-weight:700;margin:22px 0 6px;color:#c7d4ee}
.seo p,.seo li{color:var(--text-dim);font-size:.93rem;max-width:78ch}
.seo ul{padding-left:22px;margin:8px 0}
.seo code{font-family:var(--mono);font-size:.85em;color:var(--cyan);background:rgba(34,211,238,.08);padding:1px 6px;border-radius:6px}
.seo .grid3{display:grid;gap:16px;grid-template-columns:1fr}
@media(min-width:820px){.seo .grid3{grid-template-columns:repeat(3,1fr)}}
.card{
  background:linear-gradient(180deg,var(--panel-top),var(--panel-bot));
  border:1px solid var(--border);border-radius:var(--radius);padding:20px;
  transition:border-color .2s ease,transform .2s ease;
}
.card:hover{border-color:var(--border-hi);transform:translateY(-2px)}
.card h3{margin-top:0}
.secure-note{border-left:3px solid var(--green);padding-left:14px}
footer.site{border-top:1px solid var(--border);padding:22px 0 30px;color:var(--text-faint);font-size:.8rem}
kbd.k{font-family:var(--mono);background:rgba(16,25,48,.9);border:1px solid var(--border-hi);border-radius:6px;padding:1px 7px;font-size:.75rem;color:var(--cyan)}


/* AI chip in logo */
.ai-chip{
  display:inline-block;vertical-align:middle;margin-left:8px;transform:translateY(-2px);
  font-size:.58em;font-weight:700;letter-spacing:.12em;color:#04101c;
  background:var(--grad);padding:2px 8px;border-radius:7px;
  box-shadow:0 2px 10px -2px rgba(56,140,246,.6), inset 0 1px 0 rgba(255,255,255,.3);
}
/* ============ SYNTAX HIGHLIGHT ============ */
.tok-key{color:#7dd3fc}
.tok-str{color:#86efac}
.tok-num{color:#fcd34d}
.tok-bool{color:#f0abfc}
.tok-kw{color:#c4b5fd;font-weight:600}
.tok-com{color:#5c6e92;font-style:italic}
.tok-tag{color:#f0abfc}
.tok-attr{color:#7dd3fc}
.tok-punc{color:#8ea0bf}
.tok-sel{color:#fda4af}
.tok-prop{color:#7dd3fc}

/* ============ MULTI-PAGE ADDITIONS ============ */
.pill{text-decoration:none;display:inline-block}
.top-nav{display:flex;gap:18px;align-items:center;flex-wrap:wrap}
.top-nav a{color:var(--text-dim);text-decoration:none;font-size:.85rem;font-weight:600;transition:color .15s}
.top-nav a:hover,.top-nav a.active{color:var(--cyan)}
.breadcrumb{font-size:.78rem;color:var(--text-faint);margin:18px 0 4px}
.breadcrumb a{color:var(--text-dim);text-decoration:none}
.breadcrumb a:hover{color:var(--cyan)}
/* article pages */
article.post{max-width:78ch;margin:10px 0 40px}
article.post h1{font-size:1.9rem;font-weight:700;letter-spacing:-.02em;line-height:1.25;margin:8px 0 6px;color:#f2f6ff}
article.post .post-meta{font-size:.78rem;color:var(--text-faint);font-family:var(--mono);margin-bottom:22px}
article.post h2{font-size:1.3rem;font-weight:700;margin:30px 0 10px;color:#eaf0fc}
article.post h3{font-size:1.05rem;font-weight:700;margin:22px 0 8px;color:#c7d4ee}
article.post p,article.post li{color:var(--text-dim);font-size:.95rem;margin:10px 0}
article.post ul,article.post ol{padding-left:24px}
article.post code{font-family:var(--mono);font-size:.85em;color:var(--cyan);background:rgba(34,211,238,.08);padding:1px 6px;border-radius:6px}
article.post pre{
  background:linear-gradient(180deg,var(--panel-top),var(--panel-bot));
  border:1px solid var(--border);border-radius:12px;padding:16px;overflow:auto;
  font-family:var(--mono);font-size:.82rem;line-height:1.55;color:var(--text);margin:14px 0;
}
article.post pre code{background:none;padding:0;color:var(--text)}
article.post blockquote{border-left:3px solid var(--violet);padding-left:14px;color:var(--text-dim);margin:14px 0}
.tool-cta{
  display:block;margin:22px 0;padding:16px 18px;border-radius:12px;text-decoration:none;
  background:linear-gradient(180deg,rgba(34,211,238,.10),rgba(59,130,246,.08));
  border:1px solid rgba(34,211,238,.35);color:var(--text);font-weight:600;font-size:.92rem;
  transition:border-color .15s,transform .15s;
}
.tool-cta:hover{border-color:var(--cyan);transform:translateY(-1px)}
.tool-cta small{display:block;font-weight:400;color:var(--text-dim);margin-top:2px;font-size:.8rem}
/* blog index cards */
.post-grid{display:grid;gap:16px;grid-template-columns:1fr;margin:20px 0 40px}
@media(min-width:820px){.post-grid{grid-template-columns:1fr 1fr}}
.post-card{display:block;text-decoration:none;padding:20px;border-radius:var(--radius);
  background:linear-gradient(180deg,var(--panel-top),var(--panel-bot));border:1px solid var(--border);
  transition:border-color .2s,transform .2s}
.post-card:hover{border-color:var(--border-hi);transform:translateY(-2px)}
.post-card h3{color:#eaf0fc;font-size:1rem;margin:0 0 6px}
.post-card p{color:var(--text-dim);font-size:.85rem;margin:0}
.post-card .tagline-sm{font-size:.7rem;letter-spacing:.14em;text-transform:uppercase;color:var(--cyan);font-weight:700}
/* footer nav */
.footer-nav{display:flex;gap:16px;flex-wrap:wrap;margin-bottom:10px}
.footer-nav a{color:var(--text-dim);text-decoration:none;font-size:.8rem}
.footer-nav a:hover{color:var(--cyan)}
/* legal pages */
.legal{max-width:78ch;margin:10px 0 50px}
.legal h1{font-size:1.7rem;margin:14px 0 6px;color:#f2f6ff}
.legal h2{font-size:1.15rem;margin:26px 0 8px;color:#eaf0fc}
.legal p,.legal li{color:var(--text-dim);font-size:.92rem;margin:9px 0}
.legal ul{padding-left:24px}
.updated{font-size:.78rem;color:var(--text-faint);font-family:var(--mono)}