:root {
  --navy: #0B1F3B;
  --teal: #009688;
  --green: #4CAF50;
  --mint: #8FE6D9;
  --bg: #F8FAFC;
  --card: #FFFFFF;
  --text: #1F2937;
  --gray: #64748B;
  --shadow: 0 10px 25px rgba(11,31,59,.08);
  --radius: 16px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0A0F1A;
    --card: #0F172A;
    --text: #E5E7EB;
    --gray: #A3AFBF;
    --shadow: 0 12px 28px rgba(0,0,0,.35);
  }
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
html, body {
  margin: 0; padding: 0;
  background: var(--bg); color: var(--text);
  font: 16px/1.6 system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;
}
a { color: var(--teal); text-decoration: none; }
a:hover { text-decoration: underline; }
.container { max-width: 1080px; margin: 0 auto; padding: 20px; }
@media (max-width: 768px) { .container { padding: 16px; } }

/* Header */
header { position: sticky; top: 0; z-index: 999;
  background: linear-gradient(180deg, rgba(255,255,255,.92), rgba(255,255,255,0));
  backdrop-filter: saturate(1.2) blur(8px);
  border-bottom: 1px solid rgba(0,0,0,.05);
}
.nav { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 12px 0; }
@media (max-width:768px){ .nav{ padding:8px 0; } }
.brand { display:flex; align-items:center; gap:12px; }
.brand img { height:36px; width:auto; }
@media (max-width:768px){ .brand img{ height:32px; } }
.cta { display:flex; gap:8px; flex-wrap:wrap; }
.btn { border:none; background:var(--teal); color:#fff; padding:10px 16px; border-radius:12px; font-weight:600; cursor:pointer; box-shadow:var(--shadow); transition:transform .05s, filter .2s; display:inline-block; font-size:14px; }
@media (max-width:768px){ .btn{ padding:8px 12px; font-size:13px; } }
.btn:hover { transform: translateY(-1px); filter: brightness(1.05); text-decoration:none; }
.btn.green { background: linear-gradient(90deg, var(--green), #2e7d32); }
.btn.ghost { background: transparent; color: var(--teal); border: 2px solid var(--teal); box-shadow: none; }
.btn.small { padding:6px 12px; font-size:13px; }

/* Hero */
.hero { display:grid; grid-template-columns:1.15fr .85fr; gap:32px; align-items:center; padding:40px 0; }
@media (max-width:900px){ .hero{ grid-template-columns:1fr; padding:24px 0; gap:24px; } }
h1{ font-size:38px; line-height:1.15; margin:0 0 12px; color:var(--navy); }
@media (max-width:768px){ h1{ font-size:28px; } }
h2{ font-size:28px; margin:0 0 10px; color:var(--navy); }
@media (max-width:768px){ h2{ font-size:22px; } }
h3{ font-size:18px; margin:0 0 8px; color:var(--navy); }
.lead{ color:var(--gray); font-size:17px; margin:0 0 18px; }
@media (max-width:768px){ .lead{ font-size:15px; } }
.badge{ display:inline-flex; align-items:center; gap:6px; background:rgba(0,150,136,.12); border:1px solid rgba(0,150,136,.25); color:var(--teal); padding:5px 10px; border-radius:999px; font-size:12px; font-weight:600; margin-bottom:10px; }
.chatgpt-box{ background:linear-gradient(135deg,#10a37f 0%,#1a7f64 100%); border-radius:var(--radius); padding:24px; color:#fff; text-align:center; margin:24px 0; }
@media (max-width:768px){ .chatgpt-box{ padding:18px; } }
.chatgpt-box h3{ color:#fff; margin:0 0 8px; }
.chatgpt-box p{ margin:0 0 16px; opacity:.95; font-size:15px; }
.btn.chatgpt{ background:#fff; color:#10a37f; font-weight:700; }
.btn.chatgpt:hover{ background:#f0f0f0; }

/* Sections */
section{ padding:28px 0; }
@media (max-width:768px){ section{ padding:20px 0; } }
.cards{ display:grid; grid-template-columns:repeat(3,1fr); gap:14px; }
@media (max-width:900px){ .cards{ grid-template-columns:1fr; gap:12px; } }
.card{ background:var(--card); padding:18px; border-radius:var(--radius); box-shadow:var(--shadow); }
@media (max-width:768px){ .card{ padding:14px; } }
.card h3{ margin:0 0 6px; color:var(--navy); font-size:17px; }
.muted{ color:var(--gray); font-size:14px; }
.divider{ height:1px; background:linear-gradient(90deg, transparent, #cbd5e1, transparent); margin:24px 0; }
@media (max-width:768px){ .divider{ margin:18px 0; } }

/* Tool */
.tool{ background:var(--card); border-radius:var(--radius); box-shadow:var(--shadow); padding:20px; }
@media (max-width:768px){ .tool{ padding:16px; } }
.grid{ display:grid; grid-template-columns:2fr 1fr; gap:12px; margin-top:12px; }
@media (max-width:720px){ .grid{ grid-template-columns:1fr; gap:10px; } }
label{ font-weight:600; color:var(--navy); display:block; margin-bottom:5px; font-size:13px; }
input{ width:100%; padding:11px; border-radius:10px; border:1px solid #e2e8f0; background:#fff; font-size:14px; }
@media (max-width:768px){ input{ padding:10px; font-size:16px; } }
.results{ display:none; margin-top:14px; }
.linklist{ display:grid; gap:10px; margin:10px 0 0 0; padding:0; list-style:none; }
.result-link{ display:flex; justify-content:space-between; align-items:center; border:1px solid #e2e8f0; border-radius:12px; padding:12px 14px; background:#fff; gap:10px; }
@media (max-width:768px){ .result-link{ flex-direction:column; align-items:flex-start; gap:8px; } }
.result-link strong{ color:var(--navy); font-size:15px; }
.hint{ font-size:12px; color:var(--gray); margin-top:8px; }
.hint a{ text-decoration:underline; color:var(--teal); font-weight:600; }

/* Table */
.comparison-table{ width:100%; border-collapse:collapse; margin-top:14px; font-size:14px; }
.comparison-table th, .comparison-table td{ padding:10px; text-align:left; border-bottom:1px solid #e2e8f0; }
@media (max-width:768px){
  .comparison-table{ font-size:12px; }
  .comparison-table th, .comparison-table td{ padding:8px 6px; }
}
.comparison-table th{ background:var(--mint); color:#064e3b; font-weight:600; }
.comparison-table tr:hover{ background:rgba(0,150,136,.05); }

/* Popular tags */
.popular-searches{ display:flex; gap:8px; flex-wrap:wrap; margin-top:10px; }
.search-tag{ background:var(--card); border:1px solid #e2e8f0; padding:6px 10px; border-radius:999px; font-size:12px; cursor:pointer; transition:all .2s; }
.search-tag:hover{ background:var(--mint); border-color:var(--teal); color:#064e3b; }

/* Footer */
footer{ margin-top:28px; padding:28px 0 50px; color:var(--gray); }
@media (max-width:768px){ footer{ padding:20px 0 40px; } }
.legal{ display:grid; grid-template-columns:2fr 1fr; gap:14px; }
@media (max-width:900px){ .legal{ grid-template-columns:1fr; gap:12px; } }

/* FAQ */
details{ background:var(--card); border-radius:var(--radius); padding:14px; margin-bottom:10px; box-shadow:var(--shadow); }
summary{ font-weight:600; color:var(--navy); cursor:pointer; font-size:15px; }
details p{ margin:8px 0 0 0; color:var(--gray); font-size:14px; }