/* ============================================================
   FastIPLookup — Pure CSS3 Design System
   Dark glassmorphism · Mobile-first · CSS Custom Properties
   ============================================================ */

:root{
  --bg:#0b0f19;
  --bg-2:#0e1422;
  --surface:#111a2c;
  --surface-2:#15203a;
  --surface-3:#1b2947;
  --glass:rgba(21,32,58,.62);
  --glass-2:rgba(27,41,71,.5);
  --border:rgba(120,160,220,.14);
  --border-strong:rgba(120,160,220,.28);
  --text:#e8eefc;
  --text-dim:#aab8d6;
  --muted:#7a88a8;
  --mono:"SFMono-Regular",ui-monospace,"JetBrains Mono",Menlo,Consolas,monospace;
  --sans:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;

  --accent:#3dd6c0;
  --accent-2:#4aa8ff;
  --accent-3:#8b7bff;
  --danger:#ff5d6c;
  --warn:#ffb648;
  --ok:#3dd68c;
  --cyan:#41d6ff;

  --radius:14px;
  --radius-sm:9px;
  --radius-lg:22px;
  --shadow:0 18px 50px -20px rgba(0,0,0,.7),0 2px 10px rgba(0,0,0,.35);
  --shadow-glow:0 0 0 1px rgba(61,214,192,.18),0 18px 60px -18px rgba(61,214,192,.25);
  --grad:linear-gradient(135deg,var(--accent) 0%,var(--accent-2) 55%,var(--accent-3) 100%);
  --container:1200px;
  --header-h:66px;
  --accent-soft:rgba(61,214,192,.10);
  --canvas-bg:#060a13;--canvas-grid:rgba(120,160,220,.12);--canvas-land:rgba(120,160,220,.40);--canvas-label:#aab8d6;
  --code-bg:#060a13;--code-text:#c9d6ff;
}

[data-theme="light"]{
  --bg:#f3f6fc;--bg-2:#e8eef9;--surface:#ffffff;--surface-2:#f1f5fc;--surface-3:#e4ebf7;
  --glass:rgba(255,255,255,.82);--glass-2:rgba(241,245,252,.75);
  --border:rgba(20,40,80,.13);--border-strong:rgba(20,40,80,.24);
  --text:#0f1a2e;--text-dim:#34425d;--muted:#5c6c8a;
  --shadow:0 18px 50px -24px rgba(20,40,80,.28),0 2px 10px rgba(20,40,80,.08);
  --shadow-glow:0 0 0 1px rgba(61,214,192,.28),0 18px 60px -24px rgba(14,165,233,.25);
  --accent-soft:rgba(14,165,233,.10);
  --canvas-bg:#eaf1fb;--canvas-grid:rgba(20,40,80,.10);--canvas-land:rgba(20,40,80,.42);--canvas-label:#34425d;
  --code-bg:#0f1a2e;--code-text:#d7e3ff;
}

*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  margin:0;font-family:var(--sans);background:var(--bg);color:var(--text);
  line-height:1.6;font-size:16px;min-height:100vh;overflow-x:hidden;
  background-image:
    radial-gradient(900px 500px at 85% -8%,rgba(74,168,255,.10),transparent 60%),
    radial-gradient(800px 500px at -5% 10%,rgba(139,123,255,.10),transparent 55%),
    radial-gradient(700px 400px at 50% 110%,rgba(61,214,192,.08),transparent 60%);
  background-attachment:fixed;
}
body::before{
  content:"";position:fixed;inset:0;z-index:-1;pointer-events:none;opacity:.5;
  background-image:linear-gradient(var(--border) 1px,transparent 1px),linear-gradient(90deg,var(--border) 1px,transparent 1px);
  background-size:46px 46px;mask-image:radial-gradient(circle at 50% 0%,#000 0%,transparent 70%);
}
img,svg{max-width:100%;display:block}
a{color:var(--accent-2);text-decoration:none;transition:color .15s,opacity .15s}
a:hover{color:var(--accent)}
h1,h2,h3,h4,h5{line-height:1.2;margin:0 0 .5em;font-weight:750;letter-spacing:-.02em}
h1{font-size:clamp(1.9rem,4.5vw,3.1rem)}
h2{font-size:clamp(1.5rem,3vw,2.15rem)}
h3{font-size:1.25rem}
p{margin:0 0 1em}
code,pre,.mono{font-family:var(--mono)}
.container{width:100%;max-width:var(--container);margin:0 auto;padding:0 20px}
.muted{color:var(--muted)}
.small{font-size:.85rem}
.tiny{font-size:.76rem;letter-spacing:.04em;text-transform:uppercase}
.center{text-align:center}
.skip-link{position:absolute;left:-999px;top:0;background:var(--accent);color:#04201c;padding:10px 16px;z-index:999;border-radius:0 0 8px 0}
.skip-link:focus{left:0}

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex;align-items:center;gap:.5em;cursor:pointer;border:1px solid var(--border-strong);
  background:var(--surface-2);color:var(--text);padding:.72em 1.15em;border-radius:var(--radius-sm);
  font-weight:650;font-size:.95rem;font-family:inherit;transition:transform .12s,background .18s,border-color .18s,box-shadow .18s;
}
.btn:hover{background:var(--surface-3);border-color:var(--accent);color:var(--text);transform:translateY(-1px)}
.btn:active{transform:translateY(0)}
.btn-accent{background:var(--grad);color:#04151a;border-color:transparent;box-shadow:0 10px 30px -12px rgba(61,214,192,.6)}
.btn-accent:hover{filter:brightness(1.08);color:#04151a}
.btn-ghost{background:transparent}
.btn-sm{padding:.42em .8em;font-size:.85rem}
.btn-block{width:100%;justify-content:center}
.btn[disabled]{opacity:.5;cursor:not-allowed}
.btn-icon{padding:.45em .6em}

/* ---------- Header ---------- */
.site-header{position:sticky;top:0;z-index:50;background:var(--glass);backdrop-filter:blur(16px) saturate(140%);-webkit-backdrop-filter:blur(16px) saturate(140%);border-bottom:1px solid var(--border)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:var(--header-h)}
.header-glow{position:absolute;inset:0;pointer-events:none;background:linear-gradient(180deg,var(--accent-soft,rgba(61,214,192,.08)),transparent 70%);opacity:.6}
.brand{display:inline-flex;align-items:center;gap:.6em;color:var(--text);font-size:1.18rem;letter-spacing:-.02em}
.brand:hover{color:var(--text)}
.brand-mark{color:var(--accent);display:inline-flex}
.brand-text strong{color:var(--text)}
.brand-text .tld{color:var(--muted);font-size:.65em;vertical-align:super;font-weight:600}
.primary-nav{display:flex;align-items:center;gap:.35rem}
.primary-nav a{color:var(--text-dim);padding:.5em .8em;border-radius:8px;font-weight:600;font-size:.95rem}
.primary-nav a:hover{color:var(--text);background:var(--surface-2)}
.primary-nav a.active{color:var(--accent)}
.primary-nav a.btn-accent{background:linear-gradient(135deg,var(--accent),var(--accent-2,#0ea5e9));color:#04121a;padding:.55em 1.1em;font-weight:700;box-shadow:0 4px 14px rgba(45,212,191,.25)}
.primary-nav a.btn-accent:hover{color:#04121a;transform:translateY(-1px);background:linear-gradient(135deg,var(--accent),var(--accent-2,#0ea5e9))}
.nav-toggle{display:none;background:none;border:0;cursor:pointer;padding:8px;flex-direction:column;gap:5px}
.nav-toggle span{width:24px;height:2px;background:var(--text);border-radius:2px;transition:.25s}
.nav-toggle[aria-expanded="true"] span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] span:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* ---------- Cards / glass ---------- */
.card{background:var(--glass);border:1px solid var(--border);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px)}
.card.flat{box-shadow:none;background:var(--surface)}
.card.glow{box-shadow:var(--shadow-glow)}
.card h2,.card h3{margin-top:0}
.grid{display:grid;gap:20px}
.grid-2{grid-template-columns:repeat(2,1fr)}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}
.grid-auto{grid-template-columns:repeat(auto-fill,minmax(260px,1fr))}
.section{padding:clamp(38px,6vw,72px) 0}
.section-tight{padding:clamp(24px,4vw,44px) 0}
.eyebrow{display:inline-flex;align-items:center;gap:.5em;color:var(--accent);font-weight:700;font-size:.8rem;letter-spacing:.12em;text-transform:uppercase;margin-bottom:.8em}
.eyebrow::before{content:"";width:22px;height:2px;background:var(--grad);border-radius:2px}

/* ---------- Hero ---------- */
.hero{position:relative;padding:clamp(46px,7vw,90px) 0 clamp(30px,5vw,60px)}
.hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:38px;align-items:center}
.hero h1 .grad{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p.lead{font-size:1.15rem;color:var(--text-dim);max-width:620px}
.hero-search{display:flex;gap:10px;margin:22px 0 14px;flex-wrap:wrap}
.hero-search input[type="text"]{flex:1;min-width:240px}
.hero-tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px}
.tag{font-size:.8rem;color:var(--text-dim);background:var(--surface-2);border:1px solid var(--border);padding:.3em .7em;border-radius:999px}
.hero-visual{position:relative;aspect-ratio:1/1;max-width:420px;margin:0 auto;width:100%}
.hero-visual .ring{position:absolute;inset:0;border-radius:50%;border:1px solid var(--border-strong);animation:spin 28s linear infinite}
.hero-visual .ring.r2{inset:9%;animation-duration:38s;animation-direction:reverse;border-style:dashed}
.hero-visual .ring.r3{inset:18%;animation-duration:22s;border-color:rgba(61,214,192,.3)}
.hero-visual .core{position:absolute;inset:30%;border-radius:50%;background:radial-gradient(circle at 35% 30%,var(--surface-3),var(--surface));border:1px solid var(--border-strong);display:grid;place-items:center;box-shadow:var(--shadow-glow)}
.hero-visual .core .ip{font-family:var(--mono);font-size:clamp(.8rem,1.6vw,1rem);color:var(--accent);text-align:center;word-break:break-all;padding:8px}
.hero-visual .orb{position:absolute;width:12px;height:12px;border-radius:50%;background:var(--accent);box-shadow:0 0 16px var(--accent)}
.hero-visual .orb.a{top:4%;left:50%}.hero-visual .orb.b{bottom:6%;left:18%;background:var(--accent-2);box-shadow:0 0 16px var(--accent-2)}
.hero-visual .orb.c{top:30%;right:2%;background:var(--accent-3);box-shadow:0 0 16px var(--accent-3)}

/* Live connection panel on arrival */
.hero-panel{position:relative;display:flex;flex-direction:column;gap:14px}
.conn-card{position:relative;background:var(--surface);border:1px solid var(--border-strong);border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden}
.conn-head{display:flex;align-items:center;justify-content:space-between;padding:14px 16px;border-bottom:1px solid var(--border);background:linear-gradient(180deg,var(--surface-2),transparent)}
.conn-status{display:inline-flex;align-items:center;gap:8px;font-size:.82rem;font-weight:700;color:var(--ok);letter-spacing:.02em}
.live-dot{width:8px;height:8px;border-radius:50%;background:var(--ok);box-shadow:0 0 0 0 rgba(61,216,140,.6);animation:pulse 1.8s infinite}
@keyframes pulse{0%{box-shadow:0 0 0 0 rgba(61,216,140,.55)}70%{box-shadow:0 0 0 10px rgba(61,216,140,0)}100%{box-shadow:0 0 0 0 rgba(61,216,140,0)}}
.conn-ip{padding:16px;font-family:var(--mono);font-size:clamp(1.3rem,2.6vw,1.8rem);font-weight:700;color:var(--accent);word-break:break-all;letter-spacing:-.01em}
.conn-grid{display:grid;grid-template-columns:1fr 1fr;gap:1px;background:var(--border);border-top:1px solid var(--border)}
.conn-grid .cell{background:var(--surface);padding:11px 14px}
.conn-grid .k{font-size:.72rem;text-transform:uppercase;letter-spacing:.08em;color:var(--muted);margin-bottom:3px}
.conn-grid .v{font-size:.95rem;color:var(--text);font-weight:600;word-break:break-word}
.conn-grid .v.mono{font-family:var(--mono);font-weight:500;font-size:.86rem}
.hero-map{height:230px;border-top:1px solid var(--border);background:var(--canvas-bg);position:relative}
.hero-map .leaflet-container{height:100%;width:100%;background:var(--canvas-bg);font-family:var(--sans)}
.hero-actions{display:flex;gap:10px;flex-wrap:wrap}
.hero-actions .btn{flex:1;min-width:140px;justify-content:center}
.hero-map .leaflet-control-zoom a{background:var(--surface);color:var(--text);border-color:var(--border-strong)}
.hero-map .leaflet-control-attribution{background:var(--glass);color:var(--muted);font-size:.7rem}
.hero-map .leaflet-control-attribution a{color:var(--accent-2)}
.conn-loading{padding:30px 16px;text-align:center;color:var(--muted);font-size:.9rem}
.spinner{width:26px;height:26px;border:3px solid var(--border);border-top-color:var(--accent);border-radius:50%;animation:spin .8s linear infinite;margin:0 auto 12px}
@media(max-width:860px){.hero-grid{grid-template-columns:1fr}.hero-map{height:200px}}
@keyframes spin{to{transform:rotate(360deg)}}

/* ---------- Forms ---------- */
input,select,textarea{
  width:100%;font-family:inherit;font-size:1rem;color:var(--text);background:var(--bg-2);
  border:1px solid var(--border-strong);border-radius:var(--radius-sm);padding:.72em .9em;transition:border-color .15s,box-shadow .15s
}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px rgba(61,214,192,.16)}
label{display:block;font-weight:600;font-size:.9rem;margin:.8em 0 .35em;color:var(--text-dim)}
.field-row{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:14px}
.hint{font-size:.82rem;color:var(--muted);margin-top:.35em}
input[type="range"]{padding:0;background:none;border:0;accent-color:var(--accent)}
.checkbox{display:flex;align-items:center;gap:.6em}
.checkbox input{width:auto}

/* ---------- Output / telemetry ---------- */
.kv{display:grid;grid-template-columns:minmax(130px,1fr) 1.4fr;gap:.4em 1em;font-size:.92rem}
.kv dt{color:var(--muted);font-weight:600}
.kv dd{margin:0;font-family:var(--mono);word-break:break-all;display:flex;align-items:center;gap:.5em;justify-content:space-between}
.stat-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:14px}
.stat{background:var(--surface-2);border:1px solid var(--border);border-radius:var(--radius-sm);padding:14px 16px}
.stat .label{color:var(--muted);font-size:.78rem;text-transform:uppercase;letter-spacing:.06em}
.stat .value{font-family:var(--mono);font-size:1.1rem;font-weight:700;margin-top:.3em;word-break:break-all}
.stat .value.accent{color:var(--accent)}
.pill{display:inline-flex;align-items:center;gap:.4em;font-size:.76rem;font-weight:700;padding:.25em .65em;border-radius:999px;border:1px solid var(--border-strong)}
.pill.ok{color:var(--ok);background:rgba(61,214,140,.1);border-color:rgba(61,214,140,.3)}
.pill.warn{color:var(--warn);background:rgba(255,182,72,.1);border-color:rgba(255,182,72,.3)}
.pill.danger{color:var(--danger);background:rgba(255,93,108,.1);border-color:rgba(255,93,108,.3)}
.pill.info{color:var(--cyan);background:rgba(65,214,255,.1);border-color:rgba(65,214,255,.3)}
.copy-btn{background:none;border:0;color:var(--muted);cursor:pointer;padding:2px 5px;border-radius:5px;font-size:.85rem}
.copy-btn:hover{color:var(--accent);background:var(--surface-3)}

/* ---------- Binary bitstream ---------- */
.bitstream{display:flex;flex-wrap:wrap;gap:4px;font-family:var(--mono);font-size:.9rem;margin:10px 0}
.bitstream .octet{display:inline-flex;gap:2px;padding:4px 6px;border-radius:6px;background:var(--surface-2);border:1px solid var(--border)}
.bitstream .bit{padding:1px 2px;border-radius:3px}
.bitstream .bit.net{color:var(--accent);background:rgba(61,214,192,.12)}
.bitstream .bit.host{color:var(--text-dim)}
.bitstream .dot{color:var(--muted);align-self:center}

/* ---------- Tables ---------- */
.table-wrap{overflow-x:auto;border:1px solid var(--border);border-radius:var(--radius-sm)}
table{width:100%;border-collapse:collapse;font-size:.9rem;min-width:520px}
th,td{padding:.7em 1em;text-align:left;border-bottom:1px solid var(--border)}
th{background:var(--surface-2);color:var(--text-dim);font-weight:700;font-size:.82rem;text-transform:uppercase;letter-spacing:.05em}
tbody tr:hover{background:var(--surface-2)}
td.mono{font-family:var(--mono)}

/* ---------- Code / ascii ---------- */
pre.code{background:var(--code-bg);border:1px solid var(--border-strong);border-radius:var(--radius-sm);padding:16px;overflow:auto;font-size:.85rem;line-height:1.55;color:var(--code-text)}
pre.code .c{color:var(--muted)}
pre.code .k{color:var(--accent)}
pre.code .s{color:var(--warn)}
pre.ascii{background:var(--canvas-bg);border:1px solid var(--border);border-radius:var(--radius-sm);padding:18px;overflow:auto;color:var(--accent);font-size:.8rem;line-height:1.5}

/* ---------- Tool grid cards ---------- */
.tool-card{display:flex;flex-direction:column;gap:.6em;padding:20px;border-radius:var(--radius);background:var(--glass);border:1px solid var(--border);transition:transform .15s,border-color .18s,box-shadow .18s;cursor:pointer;height:100%}
a.tool-card{color:var(--text)}
.tool-card:hover{transform:translateY(-3px);border-color:var(--accent);box-shadow:var(--shadow-glow);color:var(--text)}
.tool-card .ico{width:42px;height:42px;border-radius:10px;display:grid;place-items:center;background:var(--surface-3);color:var(--accent);font-size:1.3rem}
.tool-card h3{margin:.2em 0 0;font-size:1.05rem}
.tool-card p{margin:0;color:var(--muted);font-size:.88rem}
.tool-card .num{font-family:var(--mono);color:var(--muted);font-size:.78rem}
.cat-pills{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:22px;position:sticky;top:calc(var(--header-h) + 8px);z-index:10;padding:10px 0;background:linear-gradient(var(--bg) 60%,transparent)}
.cat-pills button{border:1px solid var(--border-strong);background:var(--surface-2);color:var(--text-dim);padding:.45em .95em;border-radius:999px;cursor:pointer;font-weight:600;font-size:.86rem}
.cat-pills button.active{background:var(--grad);color:#04151a;border-color:transparent}

/* ---------- Accordions ---------- */
.accordion{border:1px solid var(--border);border-radius:var(--radius-sm);overflow:hidden;background:var(--surface)}
.accordion + .accordion{margin-top:10px}
.accordion summary{list-style:none;cursor:pointer;padding:16px 18px;font-weight:650;display:flex;justify-content:space-between;align-items:center;gap:1em}
.accordion summary::-webkit-details-marker{display:none}
.accordion summary::after{content:"+";color:var(--accent);font-size:1.4rem;font-weight:400;transition:transform .2s}
.accordion[open] summary::after{transform:rotate(45deg)}
.accordion .acc-body{padding:0 18px 18px;color:var(--text-dim)}
.accordion .acc-body p:last-child{margin-bottom:0}

/* ---------- Breadcrumb ---------- */
.breadcrumb{font-size:.85rem;color:var(--muted);padding:14px 0 0}
.breadcrumb a{color:var(--text-dim)}
.breadcrumb span{margin:0 .5em}

/* ---------- Tool layout ---------- */
.tool-layout{display:grid;grid-template-columns:1fr;gap:24px}
.tool-header{display:flex;gap:16px;align-items:flex-start;margin-bottom:8px}
.tool-header .ico{width:52px;height:52px;border-radius:12px;display:grid;place-items:center;background:var(--surface-3);color:var(--accent);font-size:1.6rem;flex-shrink:0}
.tool-meta{display:flex;gap:10px;flex-wrap:wrap;margin-top:8px}

/* ---------- Map / visual ---------- */
.map-wrap{position:relative;background:var(--canvas-bg);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;aspect-ratio:16/9}
.map-wrap canvas{width:100%;height:100%;display:block}
.map-legend{position:absolute;left:12px;bottom:12px;background:var(--glass);border:1px solid var(--border);border-radius:8px;padding:8px 12px;font-size:.78rem;backdrop-filter:blur(8px);color:var(--text-dim)}
.map-coords{position:absolute;right:12px;top:12px;background:var(--glass);border:1px solid var(--border);border-radius:8px;padding:8px 12px;font-family:var(--mono);font-size:.8rem;backdrop-filter:blur(8px);color:var(--text-dim)}

/* ---------- Threat meter ---------- */
.meter{height:12px;background:var(--surface-3);border-radius:999px;overflow:hidden;border:1px solid var(--border)}
.meter > span{display:block;height:100%;border-radius:999px;background:linear-gradient(90deg,var(--ok),var(--warn),var(--danger));transition:width .6s cubic-bezier(.2,.8,.2,1)}
.threat-scale{display:flex;justify-content:space-between;font-size:.72rem;color:var(--muted);margin-top:4px}

/* ---------- FAQ search ---------- */
.search-bar{position:relative;margin-bottom:18px}
.search-bar input{padding-left:2.6em}
.search-bar::before{content:"🔍";position:absolute;left:.9em;top:50%;transform:translateY(-50%);opacity:.6}

/* ---------- Blog ---------- */
.article-layout{display:grid;grid-template-columns:1fr 280px;gap:32px;align-items:start}
.toc{position:sticky;top:calc(var(--header-h) + 16px);background:var(--glass);border:1px solid var(--border);border-radius:var(--radius);padding:18px;font-size:.88rem}
.toc h4{font-size:.8rem;text-transform:uppercase;letter-spacing:.08em;color:var(--muted);margin-bottom:.8em}
.toc a{display:block;color:var(--text-dim);padding:.3em 0;border-left:2px solid transparent;padding-left:10px}
.toc a:hover{color:var(--accent);border-color:var(--accent)}
.article-body{font-size:1.05rem;line-height:1.8;color:var(--text-dim)}
.article-body h2{color:var(--text);margin-top:1.6em;scroll-margin-top:90px}
.article-body h3{color:var(--text);margin-top:1.3em}
.article-body ul,.article-body ol{padding-left:1.4em}
.article-body li{margin:.3em 0}
.article-body blockquote{border-left:3px solid var(--accent);padding:.4em 1.2em;margin:1.2em 0;color:var(--text-dim);background:var(--surface);border-radius:0 8px 8px 0}
.article-body code{background:var(--surface-2);padding:.15em .4em;border-radius:4px;font-size:.9em;color:var(--accent)}
.author-badge{display:flex;gap:14px;align-items:center;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:16px;margin:24px 0}
.avatar{width:52px;height:52px;border-radius:50%;background:var(--grad);display:grid;place-items:center;color:#04151a;font-weight:800;font-size:1.2rem;flex-shrink:0}
.blog-card{background:var(--glass);border:1px solid var(--border);border-radius:var(--radius);padding:22px;transition:transform .15s,border-color .18s}
a.blog-card{color:var(--text);display:block;height:100%}
.blog-card:hover{transform:translateY(-3px);border-color:var(--accent)}
.blog-card .cat{font-size:.74rem;text-transform:uppercase;letter-spacing:.08em;color:var(--accent);font-weight:700}
.blog-card h3{margin:.4em 0;color:var(--text)}
.blog-card p{color:var(--muted);font-size:.9rem;margin:0}
.blog-meta{font-size:.82rem;color:var(--muted);margin-top:12px;display:flex;gap:12px;flex-wrap:wrap}

/* ---------- Pros/cons ---------- */
.proscons{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin:18px 0}
.proscons .col{border-radius:var(--radius-sm);padding:16px;border:1px solid var(--border)}
.proscons .pro{background:rgba(61,214,140,.06);border-color:rgba(61,214,140,.22)}
.proscons .con{background:rgba(255,93,108,.06);border-color:rgba(255,93,108,.22)}
.proscons h4{margin:0 0 .6em;font-size:.95rem}
.proscons ul{margin:0;padding-left:1.2em;font-size:.9rem}

/* ---------- Tabs ---------- */
.tabs{display:flex;gap:4px;border-bottom:1px solid var(--border);margin-bottom:18px;flex-wrap:wrap}
.tabs button{background:none;border:0;color:var(--muted);padding:.7em 1.1em;cursor:pointer;font-weight:650;border-bottom:2px solid transparent;font-size:.92rem;font-family:inherit}
.tabs button.active{color:var(--accent);border-color:var(--accent)}
.tab-panel{display:none}.tab-panel.active{display:block;animation:fade .3s ease}
@keyframes fade{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}

/* ---------- Misc ---------- */
.divider{height:1px;background:var(--border);margin:28px 0;border:0}
.badge-rfc{display:inline-block;font-family:var(--mono);font-size:.74rem;background:var(--surface-3);color:var(--accent-2);padding:.2em .55em;border-radius:5px;border:1px solid var(--border)}
.usecase{background:var(--surface);border:1px solid var(--border);border-left:3px solid var(--accent-2);border-radius:0 8px 8px 0;padding:14px 16px;margin:12px 0}
.usecase h4{margin:0 0 .3em;font-size:.98rem}
.usecase p{margin:0;font-size:.9rem;color:var(--text-dim)}
.ref-list{columns:2;column-gap:30px;font-size:.9rem}
.ref-list li{break-inside:avoid;margin:.3em 0}
.heat{display:inline-block;width:10px;height:10px;border-radius:2px;margin-right:5px;vertical-align:middle}
.loading{display:inline-block;width:16px;height:16px;border:2px solid var(--border-strong);border-top-color:var(--accent);border-radius:50%;animation:spin .8s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
.to-top{position:fixed;right:22px;bottom:22px;width:46px;height:46px;border-radius:50%;background:var(--surface-3);border:1px solid var(--border-strong);color:var(--accent);font-size:1.3rem;cursor:pointer;opacity:0;pointer-events:none;transition:.25s;z-index:60;box-shadow:var(--shadow)}
.to-top.show{opacity:1;pointer-events:auto}
.to-top:hover{background:var(--accent);color:#04151a}
.toast{position:fixed;left:50%;bottom:30px;transform:translate(-50%,20px);background:var(--surface-3);color:var(--text);border:1px solid var(--border-strong);padding:.7em 1.2em;border-radius:10px;font-size:.9rem;box-shadow:var(--shadow);opacity:0;pointer-events:none;transition:.25s;z-index:80}
.toast.show{opacity:1;transform:translate(-50%,0)}

/* ---------- Footer ---------- */
.site-footer{border-top:1px solid var(--border);background:var(--surface-2);margin-top:60px;padding:48px 0 24px}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:30px}
.footer-grid h4{font-size:.82rem;text-transform:uppercase;letter-spacing:.08em;color:var(--text-dim);margin-bottom:.8em}
.footer-grid a{display:block;color:var(--muted);padding:.25em 0;font-size:.9rem}
.footer-grid a:hover{color:var(--accent)}
.footer-bottom{display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;margin-top:34px;padding-top:20px;border-top:1px solid var(--border);color:var(--muted);font-size:.82rem}

/* ---------- Responsive ---------- */
@media(max-width:960px){
  .hero-grid{grid-template-columns:1fr}
  .hero-visual{max-width:320px;order:-1}
  .article-layout{grid-template-columns:1fr}
  .toc{position:static}
  .grid-4{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:760px){
  .nav-toggle{display:flex}
  .primary-nav{position:fixed;inset:var(--header-h) 0 auto 0;flex-direction:column;align-items:stretch;background:var(--bg-2);border-bottom:1px solid var(--border);padding:14px;gap:4px;transform:translateY(-120%);transition:transform .28s cubic-bezier(.2,.8,.2,1);max-height:calc(100vh - var(--header-h));overflow-y:auto}
  .primary-nav.open{transform:translateY(0)}
  .primary-nav a{padding:.85em 1em;border-radius:8px}
  .grid-3,.grid-2{grid-template-columns:1fr}
  .proscons{grid-template-columns:1fr}
  .ref-list{columns:1}
  .kv{grid-template-columns:1fr}
  .kv dd{justify-content:flex-start}
  .footer-grid{grid-template-columns:1fr}
}
@media(max-width:480px){
  .grid-4{grid-template-columns:1fr}
  .card{padding:18px}
}

.theme-toggle{background:var(--surface-2);border:1px solid var(--border-strong);color:var(--text);width:38px;height:38px;border-radius:10px;cursor:pointer;font-size:1.05rem;display:inline-grid;place-items:center;transition:transform .15s,border-color .18s,background .18s}
.theme-toggle:hover{border-color:var(--accent);transform:translateY(-1px)}
.theme-toggle .theme-icon{display:inline-block;line-height:1}
[data-theme="light"] .theme-toggle .theme-icon::before{content:"☀️"}
[data-theme="light"] .theme-toggle .theme-icon{font-size:0}
[data-theme="light"] .theme-toggle .theme-icon::before{font-size:1.05rem}

/* print */
@media print{
  .site-header,.site-footer,.to-top,.hero-search,.cat-pills,.btn,.nav-toggle{display:none!important}
  body{background:#fff;color:#000}
  .card{break-inside:avoid;border:1px solid #ccc;box-shadow:none}
}