:root{
  --bg:#f6f7fb; --card:#fff; --text:#1f2430; --muted:#667085; --line:#e4e7ee;
  --primary:#4f46e5; --primary-d:#4338ca; --ok:#16a34a; --warn:#d97706; --err:#dc2626;
  --code-bg:#0f172a; --code-fg:#e2e8f0; --radius:14px;
  --shadow:0 1px 2px rgba(16,24,40,.05),0 4px 14px rgba(16,24,40,.06);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;background:var(--bg);color:var(--text);line-height:1.65}
.container{width:100%;max-width:1120px;margin:0 auto;padding:0 16px}
header.site{background:var(--card);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;padding:14px 0}
.brand{font-weight:800;font-size:1.1rem;color:var(--text);text-decoration:none;display:flex;align-items:center;gap:8px}
.brand span.logo{display:inline-grid;place-items:center;width:30px;height:30px;border-radius:8px;background:var(--primary);color:#fff;font-size:.85rem}
.nav a.link{color:var(--muted);text-decoration:none;font-size:.92rem}
.nav a.link:hover{color:var(--primary)}
.hero{text-align:center;padding:36px 0 18px}
.hero h1{font-size:clamp(1.7rem,4.5vw,2.5rem);line-height:1.2;margin:0 0 10px;letter-spacing:-.02em}
.hero p{margin:0 auto;max-width:640px;color:var(--muted);font-size:1.05rem}

/* Ads */
.ad{display:flex;align-items:center;justify-content:center;text-align:center;border:1.5px dashed #c5cad6;border-radius:12px;background:#fafbff;color:#98a2b3;font-size:.8rem;letter-spacing:.04em;text-transform:uppercase;margin:18px auto;min-height:90px;width:100%}
.ad.sidebar{min-height:250px}
.ad small{display:block;text-transform:none;letter-spacing:0;margin-top:2px}

/* Layout */
.tool{display:grid;grid-template-columns:1fr;gap:20px;margin:10px 0 0}
@media(min-width:900px){.tool{grid-template-columns:1.05fr .95fr}}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:20px}
.card h2{margin:0 0 4px;font-size:1.15rem}
.card .sub{margin:0 0 16px;color:var(--muted);font-size:.9rem}

/* Form */
.qa{border:1px solid var(--line);border-radius:12px;padding:14px;margin-bottom:12px;background:#fcfcfe}
.qa-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:8px}
.qa-head strong{font-size:.85rem;color:var(--muted);text-transform:uppercase;letter-spacing:.05em}
.qa label{display:block;font-size:.82rem;font-weight:600;margin:8px 0 4px}
.qa input,.qa textarea{width:100%;font:inherit;font-size:.95rem;padding:10px 12px;border:1px solid var(--line);border-radius:10px;background:#fff;color:var(--text);transition:border-color .15s,box-shadow .15s}
.qa textarea{min-height:90px;resize:vertical}
.qa input:focus,.qa textarea:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px rgba(79,70,229,.15)}
.qa.invalid input.bad,.qa.invalid textarea.bad{border-color:var(--err)}
.field-note{font-size:.76rem;color:var(--err);margin-top:3px;min-height:1em}
.icon-btn{border:1px solid var(--line);background:#fff;border-radius:8px;width:32px;height:32px;cursor:pointer;color:var(--muted);font-size:.95rem;line-height:1}
.icon-btn:hover{color:var(--err);border-color:var(--err)}
.icon-btn:disabled{opacity:.4;cursor:not-allowed}
.actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:6px}
.btn{font:inherit;font-weight:600;font-size:.92rem;border-radius:10px;padding:10px 16px;cursor:pointer;border:1px solid transparent;transition:background .15s,transform .05s}
.btn:active{transform:translateY(1px)}
.btn.primary{background:var(--primary);color:#fff}
.btn.primary:hover{background:var(--primary-d)}
.btn.ghost{background:#fff;border-color:var(--line);color:var(--text)}
.btn.ghost:hover{border-color:var(--primary);color:var(--primary)}
.opts{display:flex;flex-wrap:wrap;gap:14px;align-items:center;margin:4px 0 14px;font-size:.88rem;color:var(--muted)}
.opts label{display:flex;gap:6px;align-items:center;cursor:pointer}
.status{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:12px}
.pill{font-size:.78rem;font-weight:600;padding:3px 10px;border-radius:999px;background:#eef2ff;color:var(--primary)}
.pill.ok{background:#dcfce7;color:var(--ok)}
.pill.warn{background:#fef3c7;color:var(--warn)}

/* Output */
pre.code{margin:0;background:var(--code-bg);color:var(--code-fg);border-radius:12px;padding:16px;font:.82rem/1.55 ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;overflow:auto;max-height:380px;white-space:pre-wrap;word-break:break-word}
.preview{margin-top:16px}
.preview h3{font-size:.95rem;margin:0 0 8px}
.pv-item{border:1px solid var(--line);border-radius:10px;margin-bottom:8px;overflow:hidden;background:#fff}
.pv-item button{width:100%;text-align:left;font:inherit;font-weight:600;font-size:.92rem;background:none;border:0;padding:12px 14px;cursor:pointer;display:flex;justify-content:space-between;gap:10px;color:var(--text)}
.pv-item button::after{content:"+";color:var(--muted);font-weight:700}
.pv-item.open button::after{content:"–"}
.pv-ans{display:none;padding:0 14px 12px;color:var(--muted);font-size:.9rem}
.pv-item.open .pv-ans{display:block}
.empty{color:var(--muted);font-size:.9rem;font-style:italic}

/* Toast */
#toast{position:fixed;left:50%;bottom:24px;transform:translate(-50%,30px);background:#111827;color:#fff;padding:12px 18px;border-radius:10px;font-size:.9rem;opacity:0;pointer-events:none;transition:all .25s;z-index:99;max-width:calc(100% - 32px);box-shadow:0 8px 24px rgba(0,0,0,.25)}
#toast.show{opacity:1;transform:translate(-50%,0)}
#toast.error{background:var(--err)}
#toast.success{background:var(--ok)}

/* Article */
article.guide{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:clamp(20px,4vw,40px);margin:20px 0}
article.guide h2{font-size:1.6rem;margin:1.6em 0 .5em;letter-spacing:-.01em}
article.guide h2:first-child{margin-top:0}
article.guide h3{font-size:1.15rem;margin:1.4em 0 .4em}
article.guide p,article.guide li{color:#344054}
article.guide ol,article.guide ul{padding-left:1.3em}
article.guide code{background:#f2f4f7;padding:2px 6px;border-radius:6px;font-size:.88em}
footer.site{border-top:1px solid var(--line);background:var(--card);margin-top:30px;padding:26px 0;text-align:center;color:var(--muted);font-size:.88rem}
footer.site a{color:var(--muted);margin:0 8px}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}

/* ===== Extras for multi-page site ===== */
.nav-links{display:flex;gap:18px;flex-wrap:wrap;align-items:center;justify-content:flex-end}
.nav-links a{color:var(--muted);text-decoration:none;font-size:.92rem}
.nav-links a:hover,.nav-links a[aria-current="page"]{color:var(--primary)}
@media(max-width:560px){.nav{flex-direction:column;align-items:flex-start;gap:8px}.nav-links{justify-content:flex-start;gap:14px}}

.footer-links{display:flex;flex-wrap:wrap;justify-content:center;gap:6px 14px;margin:8px 0}
footer.site .footer-links a{margin:0;color:var(--muted);text-decoration:none}
footer.site .footer-links a:hover{color:var(--primary);text-decoration:underline}

/* Static pages (privacy, terms, contact) */
.page{max-width:820px;margin:28px auto}
.page h1{font-size:clamp(1.6rem,4vw,2.1rem);margin:0 0 6px;letter-spacing:-.02em}
.page .updated{color:var(--muted);font-size:.88rem;margin:0 0 20px}
.page h2{font-size:1.25rem;margin:1.7em 0 .4em}
.page p,.page li{color:#344054}
.page ul{padding-left:1.3em}
.page a{color:var(--primary)}
.contact-box{border:1px solid var(--line);background:#f8f9ff;border-radius:12px;padding:18px;margin:18px 0}
.contact-box strong{display:block;margin-bottom:4px}

/* More tools */
.more{margin:20px 0}
.more h2{font-size:1.2rem;margin:0 0 12px}
.more-grid{display:grid;gap:14px;grid-template-columns:1fr}
@media(min-width:700px){.more-grid{grid-template-columns:1fr 1fr}}
.more-card{display:block;text-decoration:none;color:inherit;border:1px solid var(--line);border-radius:12px;background:#fff;padding:16px;box-shadow:var(--shadow);transition:border-color .15s}
.more-card:hover{border-color:var(--primary)}
.more-card strong{display:block;color:var(--primary);margin-bottom:4px}
.more-card span{color:var(--muted);font-size:.9rem}

/* Meta checker */
.field{margin-bottom:18px}
.field label{display:block;font-size:.85rem;font-weight:600;margin-bottom:5px}
.field input,.field textarea{width:100%;font:inherit;font-size:.95rem;padding:10px 12px;border:1px solid var(--line);border-radius:10px;background:#fff;color:var(--text);transition:border-color .15s,box-shadow .15s}
.field textarea{min-height:100px;resize:vertical}
.field input:focus,.field textarea:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px rgba(79,70,229,.15)}
.stats{display:flex;flex-wrap:wrap;gap:6px 14px;align-items:center;font-size:.82rem;color:var(--muted);margin-top:6px}
.stats b{color:var(--text)}
.bar{height:8px;border-radius:99px;background:#eceef4;overflow:hidden;margin-top:8px}
.bar i{display:block;height:100%;width:0;background:#c5cad6;border-radius:99px;transition:width .15s,background .15s}
.bar.ok i{background:var(--ok)}
.bar.warn i{background:var(--warn)}
.bar.bad i{background:var(--err)}
.pill.bad{background:#fee2e2;color:var(--err)}
.tabs{display:inline-flex;border:1px solid var(--line);border-radius:10px;overflow:hidden;margin-bottom:12px}
.tabs button{font:inherit;font-size:.85rem;font-weight:600;padding:7px 16px;border:0;background:#fff;color:var(--muted);cursor:pointer}
.tabs button[aria-selected="true"]{background:var(--primary);color:#fff}
.serp{border:1px solid var(--line);border-radius:12px;background:#fff;padding:16px;font-family:Arial,Helvetica,sans-serif;margin-bottom:14px;overflow:hidden}
.serp.mobile{max-width:380px}
.serp-site{display:flex;align-items:center;gap:10px;font-size:14px;color:#202124;margin-bottom:6px;min-width:0}
.serp-site .fav{flex:none;width:26px;height:26px;border-radius:50%;background:#eef2ff;color:var(--primary);display:grid;place-items:center;font-size:12px;font-weight:700;text-transform:uppercase}
.serp-site .crumb{color:#4d5156;font-size:12px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.serp-title{font-size:20px;line-height:1.3;color:#1a0dab;margin:0 0 3px;word-wrap:break-word}
.serp-desc{font-size:14px;line-height:1.58;color:#4d5156;word-wrap:break-word}
.serp .ph{color:#9aa0a6;font-style:italic}
.hint{font-size:.8rem;color:var(--muted);margin:0 0 14px}