:root{
  --bg:#0a0f1e;
  --bg-soft:#11172b;
  --card:#131a2e;
  --card-2:#182142;
  --line:#2a3550;
  --text:#e2e8f0;
  --muted:#94a3b8;
  --primary:#06b6d4;
  --primary-dark:#0891b2;
  --accent:#6366f1;
  --ok:#34d399;
  --danger-bg:rgba(248,113,113,.12);
  --danger-line:rgba(248,113,113,.4);
  --danger-text:#fca5a5;
  --header-bg:rgba(10,15,30,.82);
  --card-icon-bg:rgba(99,102,241,.16);
  --card-icon-fg:#c7d2fe;
  --dz-hover:rgba(34,211,238,.08);
  --radius:16px;
  --shadow:0 18px 40px rgba(0,0,0,.4);
  --font:"Segoe UI",system-ui,-apple-system,Roboto,Helvetica,Arial,sans-serif;
  color-scheme:dark;
}
[data-theme="light"]{
  --bg:#eef2f7;
  --bg-soft:#f4f7fb;
  --card:#ffffff;
  --card-2:#eff4fb;
  --line:#dbe3ec;
  --text:#1e293b;
  --muted:#5b6b82;
  --primary:#0891b2;
  --primary-dark:#0e7490;
  --accent:#4f46e5;
  --ok:#059669;
  --danger-bg:rgba(220,38,38,.08);
  --danger-line:rgba(220,38,38,.35);
  --danger-text:#b91c1c;
  --header-bg:rgba(255,255,255,.85);
  --card-icon-bg:rgba(79,70,229,.12);
  --card-icon-fg:#4f46e5;
  --dz-hover:rgba(8,145,178,.07);
  --shadow:0 14px 34px rgba(30,40,90,.10);
  color-scheme:light;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  font-family:var(--font);
  background:
    radial-gradient(900px 400px at 85% -10%, rgba(99,102,241,.16), transparent 60%),
    radial-gradient(700px 350px at 5% 110%, rgba(34,211,238,.10), transparent 60%),
    var(--bg);
  color:var(--text);
  line-height:1.55;
  min-height:100vh;
  transition:background-color .25s ease,color .25s ease;
}
.wrap{max-width:1100px;margin:0 auto;padding:0 20px}
a{color:inherit;text-decoration:none}
h1,h2,h3{line-height:1.2;margin:0 0 .4em}
p{margin:0 0 .6em}
.muted{color:var(--muted)}

/* header */
.site-header{position:sticky;top:0;z-index:30;background:var(--header-bg);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:66px}
.logo{display:flex;align-items:center;gap:10px;font-size:20px;font-weight:600;letter-spacing:.2px}
.logo-link{display:inline-flex;align-items:center}
.logo-mark{display:grid;place-items:center;width:34px;height:34px;border-radius:10px;background:linear-gradient(135deg,var(--primary),var(--accent));color:#04121d;font-weight:800}
.logo-text strong{color:var(--primary)}
.brand-sub{font-size:12px;font-weight:600;color:var(--muted);text-decoration:none;border-bottom:1px dashed transparent;padding-bottom:1px;transition:color .15s,border-color .15s}
.brand-sub:hover{color:#38bdf8;border-bottom-color:#38bdf8}
.nav{display:flex;align-items:center;gap:18px;font-size:14px}
.nav a{color:var(--muted)}
.nav a:hover{color:var(--text)}
.badge-privacy{color:var(--muted);border:1px solid var(--line);padding:6px 12px;border-radius:999px;font-size:12px}
@media(max-width:680px){.badge-privacy{display:none}}

/* theme toggle */
.theme-toggle{
  width:38px;height:38px;border-radius:10px;border:1px solid var(--line);background:var(--card);
  color:var(--text);cursor:pointer;font-size:16px;line-height:1;display:grid;place-items:center;
  font-family:inherit;transition:.15s;
}
.theme-toggle:hover{border-color:var(--accent)}
[data-theme="dark"] .icon-sun{display:none}
[data-theme="light"] .icon-moon{display:none}

/* hero */
.hero{padding:64px 0 28px;text-align:center}
.hero h1{font-size:clamp(28px,5vw,46px);font-weight:800;letter-spacing:-.5px;margin-bottom:14px}
.hero p{color:var(--muted);font-size:clamp(15px,2.2vw,18px);max-width:640px;margin:0 auto}

/* tool search */
.tool-search{max-width:520px;margin:0 0 30px}
.tool-search input{width:100%;padding:14px 18px;border-radius:14px;border:1px solid var(--line);background:var(--card);color:var(--text);font-size:15px;font-family:inherit}
.tool-search input:focus{outline:none;border-color:var(--accent)}
.tool-search .no-results{color:var(--muted);font-size:14px;padding:6px 2px}

/* tool grid */
.tools-section{padding:24px 0 40px}
.cat{margin-bottom:34px}
.cat h2{font-size:14px;text-transform:uppercase;letter-spacing:1.5px;color:var(--muted);margin:0 0 14px}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:16px}
.tool-card{
  display:flex;gap:14px;align-items:flex-start;text-align:left;
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:18px;cursor:pointer;transition:transform .15s ease,border-color .15s ease,background .15s ease;
  color:var(--text);font-family:inherit;
}
.tool-card:hover{transform:translateY(-3px);border-color:var(--accent);background:var(--card-2)}
.tool-card .tc-icon{flex:0 0 auto;width:42px;height:42px;border-radius:12px;display:grid;place-items:center;background:var(--card-icon-bg);color:var(--card-icon-fg)}
.tool-card .tc-icon svg{width:22px;height:22px}
.tool-card h3{font-size:16px;margin:0 0 3px}
.tool-card p{font-size:13px;color:var(--muted);margin:0}

/* workspace */
.workspace{padding:28px 0 60px}
.back-btn{background:none;border:none;color:var(--muted);cursor:pointer;font-size:14px;padding:6px 0;margin-bottom:18px}
.back-btn:hover{color:var(--text)}
.tool-head{display:flex;gap:16px;align-items:center;margin-bottom:22px}
.tool-icon-lg{width:54px;height:54px;border-radius:14px;display:grid;place-items:center;background:linear-gradient(135deg,rgba(34,211,238,.22),rgba(99,102,241,.22));color:var(--text)}
.tool-icon-lg svg{width:28px;height:28px}
.tool-head h2{font-size:24px;margin:0 0 2px}
.tool-head p{color:var(--muted);margin:0;font-size:14px}

.panel{background:var(--card);border:1px solid var(--line);border-radius:20px;padding:26px;box-shadow:var(--shadow)}

/* buttons */
.btn{border:1px solid transparent;border-radius:12px;padding:12px 20px;font-size:15px;font-weight:600;cursor:pointer;font-family:inherit;transition:.15s}
.btn.primary{background:linear-gradient(90deg,var(--primary),var(--accent));color:#04121d}
.btn.primary:hover{filter:brightness(1.1)}
.btn.lg{padding:15px 34px;font-size:16px}
.btn.ghost{background:transparent;border-color:var(--line);color:var(--muted)}
.btn.ghost:hover{color:var(--text);border-color:var(--muted)}
.btn:disabled{opacity:.55;cursor:not-allowed}

/* features + footer */
.features{padding:40px 0 20px}
.feature-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:20px}
.feature{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:22px}
.feature h3{font-size:16px}
.feature p{color:var(--muted);font-size:14px;margin:0}
.site-footer{border-top:1px solid var(--line);padding:26px 0;margin-top:40px;text-align:center;color:var(--muted);font-size:14px}
.site-footer .signature{font-weight:600;color:var(--text);margin-top:6px}

/* ---------- calculator UI ---------- */
.dt{display:flex;flex-direction:column;gap:14px}
.dt-opts{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:14px}
.dt-field{display:flex;flex-direction:column;gap:6px}
.dt-field label{font-size:13px;color:var(--muted);font-weight:600}
.dt-field input[type=text],.dt-field input[type=number],.dt-field input[type=date],.dt-field input[type=time],.dt-field select{
  background:var(--bg-soft);border:1px solid var(--line);border-radius:10px;color:var(--text);
  padding:10px 12px;font-size:14px;font-family:inherit;width:100%;
}
.dt-field input:focus,.dt-field select:focus{outline:none;border-color:var(--accent)}
.dt-field select option{background:var(--bg-soft);color:var(--text)}
.dt-lbl{font-size:13px;color:var(--muted);font-weight:600;margin-top:2px}
.dt-actions{display:flex;gap:10px;flex-wrap:wrap;align-items:center}
.dt-msg{font-size:13px;color:var(--muted)}
.dt-msg.ok{color:var(--ok)}
.dt-msg.bad{color:var(--danger-text)}
.dt-out{
  background:var(--bg-soft);border:1px solid var(--line);border-radius:12px;padding:14px;
  font-family:"Consolas","SFMono-Regular",Menlo,Monaco,"Courier New",monospace;font-size:13px;
  line-height:1.6;white-space:pre-wrap;word-break:break-word;max-height:520px;overflow:auto;margin:0;
}
.dt-hint{font-size:12px;color:var(--muted)}
.dt-badge{display:inline-block;font-size:12px;padding:2px 10px;border-radius:999px;background:var(--card-icon-bg);color:var(--card-icon-fg);font-weight:600}
.dt-list{display:flex;flex-wrap:wrap;gap:8px}
.dt-chip{padding:8px 12px;border-radius:10px;border:1px solid var(--line);background:var(--bg-soft);font-family:"Consolas",monospace;font-size:13px;cursor:pointer}
.dt-chip:hover{border-color:var(--accent)}
.dt-field.wide{grid-column:1/-1}
.dt-ta{
  width:100%;min-height:120px;resize:vertical;background:var(--bg-soft);border:1px solid var(--line);
  border-radius:12px;color:var(--text);padding:12px 14px;font-size:13.5px;line-height:1.5;
  font-family:"Consolas","SFMono-Regular",Menlo,Monaco,"Courier New",monospace;
}
.dt-ta:focus{outline:none;border-color:var(--accent)}

/* ---------- SEO previews ---------- */
.seo-preview{margin:2px 0 6px}
.seo-note{font-size:12px;color:var(--muted);margin:0 0 8px}
.seo-card{max-width:520px;border:1px solid var(--line);border-radius:12px;overflow:hidden;background:var(--card)}
.seo-card .sc-img{height:230px;display:grid;place-items:center;color:var(--muted);font-size:13px;
  background:linear-gradient(135deg,rgba(34,211,238,.18),rgba(99,102,241,.18));background-size:cover;background-position:center}
.seo-card .sc-body{padding:12px 14px}
.seo-card .sc-domain{font-size:12px;color:var(--muted);text-transform:lowercase;margin-bottom:4px}
.seo-card .sc-title{font-size:17px;font-weight:600;color:var(--text);line-height:1.3}
.seo-card .sc-desc{font-size:13.5px;color:var(--muted);margin-top:5px;line-height:1.4}
.serp{max-width:600px;border:1px solid var(--line);border-radius:12px;background:var(--card);padding:14px 16px}
.serp .sp-url{font-size:13px;color:#8ab4f8;margin-bottom:3px}
[data-theme="light"] .serp .sp-url{color:#1a0dab}
.serp .sp-title{font-size:19px;color:#8ab4f8;line-height:1.3}
[data-theme="light"] .serp .sp-title{color:#1a0dab}
.serp .sp-desc{font-size:13.5px;color:var(--muted);line-height:1.45;margin-top:3px}
.seo-grid2{display:grid;grid-template-columns:1fr 1fr;gap:14px}
@media(max-width:700px){.seo-grid2{grid-template-columns:1fr}}
.seo-meter{height:6px;border-radius:999px;background:var(--bg-soft);border:1px solid var(--line);overflow:hidden;margin-top:6px}
.seo-meter span{display:block;height:100%;width:0}
.seo-tags{display:flex;flex-wrap:wrap;gap:8px}
.seo-tag{padding:6px 11px;border-radius:999px;border:1px solid var(--line);background:var(--bg-soft);font-size:13px;color:var(--card-icon-fg);font-family:"Consolas",monospace}
.seo-kv{display:grid;grid-template-columns:auto 1fr;gap:4px 16px;font-size:13px;margin-top:4px}
.seo-kv .k{color:var(--muted)}

/* ---------- CodeMaster fields ---------- */
.dt-field input[type=color]{width:56px;height:40px;padding:2px;background:var(--bg-soft);border:1px solid var(--line);border-radius:10px;cursor:pointer}
.dt-field input[type=range]{width:100%;accent-color:var(--primary)}
.dt-field.check{flex-direction:row;align-items:center;gap:8px}
.dt-field.check input[type=checkbox]{width:18px;height:18px;accent-color:var(--primary)}
.dt-field.check label{margin:0}

/* ---------- CodeMaster live previews ---------- */
.cm-preview{margin:2px 0 6px}
.cm-stage{border:1px solid var(--line);border-radius:14px;background:var(--bg-soft);padding:26px;display:grid;place-items:center;overflow:hidden}
.cm-box{width:240px;height:150px;border-radius:14px;background:linear-gradient(135deg,#22d3ee,#6366f1);display:grid;place-items:center;color:#04121d;font-weight:700;font-size:13px;text-align:center;padding:10px}
.cm-flexbox{width:100%;min-height:180px;background:rgba(128,140,200,.06);border:1px dashed var(--line);border-radius:12px;padding:12px}
.cm-item{padding:14px 20px;border-radius:10px;background:linear-gradient(135deg,var(--primary),var(--accent));color:#04121d;font-weight:700;font-size:13px}
.cm-img{max-width:100%;height:auto;border-radius:10px;border:1px solid var(--line)}
.cm-swatches{display:flex;gap:0;border-radius:12px;overflow:hidden;border:1px solid var(--line)}
.cm-swatches span{flex:1;height:60px;display:grid;place-items:end center;font-size:10px;color:#fff;padding-bottom:4px;font-family:Consolas,monospace}