:root{
  --bg:#0f172a;--card:#111827;--card2:#1f2937;--text:#f8fafc;--muted:#cbd5e1;
  --accent:#3b82f6;--accent2:#22c55e;--border:#334155;--danger:#ef4444;
  --shadow:0 20px 70px rgba(0,0,0,.36)
}
html.light{
  --bg:#f8fafc;--card:#fff;--card2:#f1f5f9;--text:#0f172a;--muted:#475569;
  --accent:#2563eb;--accent2:#16a34a;--border:#cbd5e1;--shadow:0 20px 70px rgba(15,23,42,.12)
}
*{box-sizing:border-box}
body{
  margin:0;font-family:Inter,Arial,sans-serif;color:var(--text);
  background:radial-gradient(circle at 12% 5%,rgba(59,130,246,.32),transparent 26%),
             radial-gradient(circle at 88% 18%,rgba(34,197,94,.18),transparent 30%),var(--bg)
}
a{color:inherit;text-decoration:none}.container{max-width:1180px;margin:auto;padding:0 20px}
.nav{position:sticky;top:0;z-index:20;background:color-mix(in srgb,var(--bg) 86%,transparent);backdrop-filter:blur(14px);border-bottom:1px solid var(--border)}
.nav-inner{min-height:72px;display:flex;align-items:center;justify-content:space-between;gap:18px}
.logo{font-weight:950;font-size:23px;display:flex;align-items:center;letter-spacing:-.04em}
.logo:before{content:"";width:32px;height:32px;border-radius:10px;background:url("/assets/favicon.svg") center/cover no-repeat;margin-right:9px}
.logo span{color:var(--accent)}.logo-mini{font-size:.62em;margin-left:8px;padding:4px 7px;border:1px solid var(--border);border-radius:999px;color:var(--muted);background:var(--card2)}
.nav-links{display:flex;gap:16px;align-items:center;color:var(--muted);font-weight:700}
.btn,.button{display:inline-flex;align-items:center;justify-content:center;padding:12px 16px;border-radius:14px;border:1px solid var(--border);background:var(--card2);color:var(--text);font-weight:850;cursor:pointer}
.btn-primary{background:var(--accent);border-color:var(--accent);color:white}.btn-green{background:var(--accent2);border-color:var(--accent2);color:white}
.lang{display:flex;gap:5px;padding:4px;border:1px solid var(--border);border-radius:999px;background:var(--card2)}
.lang a{padding:5px 7px;border-radius:999px;font-size:18px}.lang a.active{background:var(--accent)}
.hero{padding:76px 0 46px}.hero-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:28px;align-items:center}
.badge{display:inline-flex;align-items:center;gap:8px;padding:9px 13px;border:1px solid var(--border);border-radius:999px;background:var(--card2);color:var(--muted);font-weight:900;margin-bottom:18px}
h1{font-size:58px;line-height:1.02;margin:0 0 18px;letter-spacing:-.055em}h2{font-size:34px;margin:0 0 18px;letter-spacing:-.035em}h3{margin:0 0 8px}
p{color:var(--muted);line-height:1.65}.lead{font-size:20px}.actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:22px}
.card,.hero-card{background:linear-gradient(180deg,var(--card),var(--card2));border:1px solid var(--border);border-radius:24px;padding:24px;box-shadow:var(--shadow)}
.card{box-shadow:none}.tool-card{transition:.18s}.tool-card:hover{transform:translateY(-3px);border-color:var(--accent);box-shadow:var(--shadow)}
.grid{display:grid;gap:18px}.grid-2{grid-template-columns:repeat(2,1fr)}.grid-3{grid-template-columns:repeat(3,1fr)}.grid-4{grid-template-columns:repeat(4,1fr)}
.section{padding:46px 0}.category-title{margin:32px 0 14px;color:var(--muted);text-transform:uppercase;letter-spacing:.12em;font-size:14px}
.search{margin-top:24px}.input,textarea,select,input{width:100%;padding:14px;border-radius:14px;border:1px solid var(--border);background:var(--bg);color:var(--text);font-size:16px;margin-top:8px}
.search input{font-size:19px;padding:18px}.tool-meta{display:flex;gap:8px;flex-wrap:wrap;margin-top:10px}.tool-meta span{font-size:12px;border:1px solid var(--border);border-radius:999px;padding:5px 8px;color:var(--muted)}
.privacy{position:relative;overflow:hidden;border-radius:28px;border:1px solid color-mix(in srgb,var(--accent) 36%,var(--border));background:linear-gradient(180deg,var(--card),var(--card2));padding:34px;box-shadow:var(--shadow)}
.privacy:after{content:"🛡️";position:absolute;right:34px;top:28px;font-size:62px;opacity:.25}.privacy-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:20px}
.privacy-card{background:var(--card2);border:1px solid var(--border);border-radius:20px;padding:20px}.icon{width:48px;height:48px;display:grid;place-items:center;border-radius:16px;background:color-mix(in srgb,var(--accent) 18%,transparent);font-size:24px;margin-bottom:12px}
.notice{padding:16px;border-radius:16px;border:1px solid var(--border);background:color-mix(in srgb,var(--accent) 12%,var(--card2));margin:18px 0}
.paypal{display:inline-flex;background:#ffc439;color:#111827;border-radius:999px;padding:13px 18px;font-weight:950;margin-top:8px}.footer{border-top:1px solid var(--border);margin-top:50px;padding:30px 0;color:var(--muted)}.footer-inner{display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap}
.hidden{display:none!important}.faq details{background:var(--card2);border:1px solid var(--border);border-radius:14px;padding:14px;margin:10px 0}.faq summary{font-weight:900;cursor:pointer}
.codebox{font-family:ui-monospace,Consolas,monospace;min-height:220px}pre.result{white-space:pre-wrap;background:var(--card2);border:1px solid var(--border);border-radius:14px;padding:14px;overflow:auto}.error,.success{display:none;margin-top:16px;padding:14px;border-radius:14px;background:var(--card2);border-left:5px solid var(--danger)}.success{border-left-color:var(--accent2)}
@media(max-width:900px){.hero-grid,.grid-2,.grid-3,.grid-4,.privacy-grid{grid-template-columns:1fr}h1{font-size:42px}.nav-links{gap:8px;flex-wrap:wrap}.privacy:after{display:none}}

/* V2.1 homepage PDF focus */
.hero-card p{
  margin:12px 0;
  padding:12px 14px;
  border:1px solid var(--border);
  border-radius:14px;
  background:var(--card2);
}
.hero-card p:hover{
  border-color:var(--accent);
}
.section .grid > .tool-card{
  min-height:auto;
}

.hero-card{display:flex;flex-direction:column;gap:10px}
.hero-card p{margin:0;padding:12px;border:1px solid var(--border);border-radius:12px}
.hero-card .btn{margin-top:10px}


/* V2.3 Premium UI */
.hero{
  padding-top:100px;
}
.hero h1{
  background:linear-gradient(90deg,#60a5fa,#22c55e);
  -webkit-background-clip:text;
  -webkit-text-fill-color:transparent;
}
.card,.tool-card{
  transition:.25s ease;
}
.tool-card:hover{
  transform:translateY(-6px);
}
.trust-grid{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:16px;
  margin-top:20px;
}
.trust{
  padding:20px;
  border-radius:18px;
  border:1px solid var(--border);
  background:var(--card2);
  text-align:center;
}
@media(max-width:900px){
 .trust-grid{grid-template-columns:1fr 1fr}
}


/* V2.4 SEO / Mobile / Donation polish */
.mobile-menu-btn{display:none}
.logo-img{height:42px;width:auto;display:block}
.donation-card{
  background:linear-gradient(135deg,rgba(59,130,246,.18),rgba(34,197,94,.14)),var(--card);
  border:1px solid color-mix(in srgb,var(--accent) 45%,var(--border));
  border-radius:28px;
  padding:34px;
  box-shadow:var(--shadow);
}
.donation-card .paypal{
  font-size:17px;
  padding:15px 22px;
}
.seo-faq{
  margin-top:22px;
}
.seo-faq details{
  background:var(--card2);
  border:1px solid var(--border);
  border-radius:16px;
  padding:16px;
  margin:10px 0;
}
.seo-faq summary{font-weight:900;cursor:pointer}
.category-pill{
  display:inline-flex;
  padding:7px 10px;
  border-radius:999px;
  border:1px solid var(--border);
  color:var(--muted);
  background:var(--card2);
  font-size:13px;
  font-weight:800;
}
@media(max-width:900px){
  .mobile-menu-btn{display:inline-flex}
  .nav-links{
    width:100%;
    display:none;
    flex-direction:column;
    align-items:flex-start;
    padding:12px 0;
  }
  .nav-links.open{display:flex}
  .nav-inner{flex-wrap:wrap}
  .logo-img{height:36px}
}

/* V2.7 quickstart language/layout fix */
.quick-card{max-width:420px}
.quick-card h3{margin-bottom:14px}
.quick-card p{margin:0;padding:13px 14px;border:1px solid var(--border);border-radius:12px;background:var(--card2)}
.quick-card p + p{margin-top:10px}
.quick-card .btn{width:100%;margin-top:18px}