/* SI Agent (siagent.best) — shared design system
   Clean editorial style · light theme · indigo/violet accents · mobile-first responsive */

:root{
  --bg:#ffffff;
  --bg-soft:#f8fafc;
  --bg-tint:#eef2ff;
  --ink:#0f172a;
  --muted:#64748b;
  --line:#e2e8f0;
  --primary:#4f46e5;
  --primary-dark:#4338ca;
  --accent:#7c3aed;
  --green:#16a34a;
  --red:#dc2626;
  --amber-bg:#fffbeb;
  --amber-line:#f59e0b;
  --radius:14px;
  --maxw:1120px;
  --font:-apple-system,BlinkMacSystemFont,"Segoe UI",Inter,Roboto,"Helvetica Neue",Arial,"Noto Sans",sans-serif;
  --shadow:0 1px 2px rgba(15,23,42,.06),0 8px 24px -12px rgba(79,70,229,.18);
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;font-family:var(--font);color:var(--ink);background:var(--bg);
  line-height:1.65;font-size:17px;-webkit-font-smoothing:antialiased;
}
img{max-width:100%;height:auto}
a{color:var(--primary);text-decoration:none}
a:hover{text-decoration:underline}
h1,h2,h3,h4{line-height:1.25;letter-spacing:-.01em;margin:0 0 .6em}
h1{font-size:clamp(2rem,4.5vw,3rem)}
h2{font-size:clamp(1.4rem,2.6vw,1.9rem);margin-top:2.2em}
h3{font-size:1.2rem}
p{margin:0 0 1em}
ul,ol{margin:0 0 1em;padding-left:1.4em}
:focus-visible{outline:3px solid var(--accent);outline-offset:2px;border-radius:4px}

.skip-link{position:absolute;left:-9999px;top:0;background:var(--primary);color:#fff;padding:.6em 1em;z-index:200;border-radius:0 0 8px 0}
.skip-link:focus{left:0;color:#fff}

.container{max-width:var(--maxw);margin:0 auto;padding:0 20px}
.section{padding:52px 0}
.section-title{margin-top:0}
.section-sub{color:var(--muted);font-size:1.1rem;max-width:720px}

/* ---------- Header ---------- */
.site-header{
  position:sticky;top:0;z-index:100;
  background:rgba(255,255,255,.92);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
}
.nav-inner{display:flex;align-items:center;gap:18px;height:66px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:1.25rem;color:var(--ink);white-space:nowrap}
.brand:hover{text-decoration:none}
.brand svg{width:32px;height:32px;flex:none}
.brand small{display:block;font-size:.68rem;font-weight:500;color:var(--muted);line-height:1.1}
.nav-links{display:flex;align-items:center;gap:4px;margin-left:auto;list-style:none;margin-top:0;margin-bottom:0;padding:0}
.nav-links>li{position:relative}
.nav-links a{display:block;padding:10px 12px;color:var(--ink);font-weight:600;font-size:.95rem;border-radius:8px;white-space:nowrap}
.nav-links a:hover{background:var(--bg-soft);text-decoration:none;color:var(--primary)}
.nav-links a.active{color:var(--primary)}
.has-drop>.drop-toggle::after{content:"▾";margin-left:5px;font-size:.75em;color:var(--muted)}
.drop{
  display:none;position:absolute;top:100%;left:0;min-width:250px;background:#fff;
  border:1px solid var(--line);border-radius:12px;box-shadow:var(--shadow);padding:8px;list-style:none;margin:0;z-index:120;
}
.has-drop:hover>.drop,.has-drop:focus-within>.drop{display:block}
.drop a{font-weight:500;font-size:.93rem}
.menu-toggle{display:none;margin-left:auto;background:none;border:1px solid var(--line);border-radius:10px;padding:8px 12px;font-size:1.1rem;cursor:pointer;color:var(--ink)}

/* ---------- Hero ---------- */
.hero{
  background:
    radial-gradient(600px 300px at 15% 10%,rgba(124,58,237,.10),transparent 60%),
    radial-gradient(700px 340px at 85% 20%,rgba(79,70,229,.12),transparent 60%),
    var(--bg-soft);
  border-bottom:1px solid var(--line);
  padding:64px 0 56px;
}
.hero-kicker{
  display:inline-block;font-size:.8rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;
  color:var(--primary-dark);background:#e0e7ff;border-radius:999px;padding:6px 14px;margin-bottom:16px;
}
.hero h1{max-width:820px}
.hero-sub{font-size:1.15rem;color:var(--muted);max-width:700px}
.hero-ctas{display:flex;gap:12px;flex-wrap:wrap;margin-top:24px}

/* ---------- Homepage dark hero (AI-product look) ---------- */
.hero-home{
  position:relative;overflow:hidden;color:#f1f0ff;text-align:center;
  background:
    radial-gradient(900px 480px at 12% -10%,rgba(124,58,237,.45),transparent 60%),
    radial-gradient(820px 440px at 88% -5%,rgba(79,70,229,.5),transparent 60%),
    radial-gradient(640px 520px at 50% 118%,rgba(168,85,247,.30),transparent 62%),
    linear-gradient(180deg,#0c0724 0%,#140b38 100%);
  padding:104px 0 112px;
}
.hero-home::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:linear-gradient(rgba(255,255,255,.05) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.05) 1px,transparent 1px);
  background-size:54px 54px;
  -webkit-mask-image:radial-gradient(720px 440px at 50% 18%,#000 25%,transparent 78%);
  mask-image:radial-gradient(720px 440px at 50% 18%,#000 25%,transparent 78%);
}
.hero-home .container{position:relative;z-index:1}
.hero-home .hero-kicker{
  color:#d6c9ff;background:rgba(124,58,237,.18);
  border:1px solid rgba(167,139,250,.4);
}
.hero-home h1{
  color:#fff;font-weight:800;max-width:920px;margin:0 auto 22px;
  font-size:clamp(2.7rem,6.4vw,4.6rem);letter-spacing:-.035em;line-height:1.04;
}
.hero-home h1 .grad{
  background:linear-gradient(100deg,#b7a4ff 0%,#e879f9 55%,#93a0ff 100%);
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.hero-home .hero-sub{color:#b9b4da;font-size:1.22rem;max-width:660px;margin:0 auto}
.hero-home .hero-ctas{justify-content:center;margin-top:36px}
.hero-home .btn-outline{
  background:rgba(255,255,255,.07);border-color:rgba(255,255,255,.24);color:#fff;
}
.hero-home .btn-outline:hover{border-color:#b7a4ff;color:#fff;background:rgba(167,139,250,.16)}
.hero-stats{
  display:flex;gap:30px;justify-content:center;flex-wrap:wrap;
  margin-top:48px;color:#8f89b8;font-size:.93rem;
}
.hero-stats strong{color:#fff;font-weight:700;margin-right:6px}
@media(max-width:640px){
  .hero-home{padding:72px 0 80px}
  .hero-stats{gap:16px}
}

/* ---------- Buttons ---------- */
.btn{
  display:inline-block;font-weight:700;font-size:1rem;border-radius:12px;
  padding:13px 26px;border:1px solid transparent;cursor:pointer;line-height:1.3;text-align:center;
}
.btn:hover{text-decoration:none;transform:translateY(-1px)}
.btn-primary{background:linear-gradient(135deg,var(--primary),var(--accent));color:#fff;box-shadow:var(--shadow)}
.btn-primary:hover{color:#fff}
.btn-outline{background:#fff;border-color:var(--line);color:var(--ink)}
.btn-outline:hover{border-color:var(--primary);color:var(--primary)}
.btn-sm{padding:9px 18px;font-size:.9rem;border-radius:10px}

/* ---------- Cards ---------- */
.card-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(270px,1fr));gap:20px;margin:28px 0}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px;box-shadow:0 1px 2px rgba(15,23,42,.04)}
.card:hover{box-shadow:var(--shadow);border-color:#c7d2fe}
.card h3{margin-top:0}
.card p{color:var(--muted);font-size:.97rem}
.card .card-link{font-weight:700}

/* ---------- Ranking items ---------- */
.rank-item{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:28px;margin:26px 0;box-shadow:0 1px 2px rgba(15,23,42,.04)}
.rank-item:target{border-color:var(--primary);box-shadow:var(--shadow)}
.rank-head{display:flex;align-items:flex-start;gap:14px;flex-wrap:wrap;margin-bottom:6px}
.rank-num{
  flex:none;width:42px;height:42px;border-radius:50%;display:flex;align-items:center;justify-content:center;
  background:linear-gradient(135deg,var(--primary),var(--accent));color:#fff;font-weight:800;font-size:1.15rem;
}
.rank-head h2{margin:0;flex:1;min-width:200px}
.rank-badge{
  display:inline-block;font-size:.78rem;font-weight:800;letter-spacing:.04em;text-transform:uppercase;
  color:var(--primary-dark);background:#e0e7ff;border-radius:999px;padding:5px 13px;margin-bottom:10px;
}
.score-pill{display:inline-block;font-size:.85rem;font-weight:700;color:var(--accent);background:#f5f3ff;border:1px solid #ddd6fe;border-radius:999px;padding:4px 12px;margin-left:8px;white-space:nowrap}
.verdict{background:var(--bg-tint);border-left:4px solid var(--primary);border-radius:0 10px 10px 0;padding:14px 18px;margin:16px 0;font-size:.98rem}
.verdict strong{color:var(--primary-dark)}
.price-line{font-size:.95rem;color:var(--muted);margin:10px 0}
.price-line strong{color:var(--ink)}
.cta-row{display:flex;gap:10px;flex-wrap:wrap;margin-top:16px;align-items:center}
.cta-note{font-size:.82rem;color:var(--muted)}

/* ---------- Pros / Cons ---------- */
.pros-cons{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin:18px 0}
.pros,.cons{border-radius:12px;padding:16px 18px;font-size:.96rem}
.pros{background:#f0fdf4;border:1px solid #bbf7d0}
.cons{background:#fef2f2;border:1px solid #fecaca}
.pros h4,.cons h4{margin:0 0 8px;font-size:.85rem;text-transform:uppercase;letter-spacing:.06em}
.pros h4{color:var(--green)} .cons h4{color:var(--red)}
.pros ul,.cons ul{margin:0;padding-left:1.1em}
.pros li,.cons li{margin-bottom:6px}
.pros li::marker{content:"✓  ";color:var(--green);font-weight:800}
.cons li::marker{content:"✕  ";color:var(--red);font-weight:800}

/* ---------- Tables ---------- */
.table-wrap{overflow-x:auto;margin:22px 0;border:1px solid var(--line);border-radius:var(--radius)}
table.compare-table{width:100%;border-collapse:collapse;font-size:.93rem;min-width:640px;margin:0}
.compare-table th,.compare-table td{text-align:left;padding:12px 14px;border-bottom:1px solid var(--line);vertical-align:top}
.compare-table thead th{background:var(--bg-soft);font-size:.85rem;text-transform:uppercase;letter-spacing:.04em;color:var(--muted);white-space:nowrap}
.compare-table tbody tr:last-child th,.compare-table tbody tr:last-child td{border-bottom:none}
.compare-table tbody tr:hover{background:#fafbff}
.compare-table td:first-child,.compare-table th:first-child{font-weight:700}

/* ---------- FAQ ---------- */
.faq{margin:24px 0}
details.faq-item{border:1px solid var(--line);border-radius:12px;margin-bottom:10px;background:#fff}
details.faq-item summary{cursor:pointer;padding:16px 20px;font-weight:700;list-style:none;display:flex;justify-content:space-between;align-items:center;gap:12px}
details.faq-item summary::-webkit-details-marker{display:none}
details.faq-item summary::after{content:"+";font-size:1.3rem;color:var(--primary);font-weight:400;flex:none}
details.faq-item[open] summary::after{content:"–"}
details.faq-item summary:hover{color:var(--primary)}
details.faq-item div{padding:0 20px 18px;color:var(--muted)}

/* ---------- Disclosure banner (auto-injected) ---------- */
.disclosure-banner{
  background:var(--amber-bg);border-bottom:1px solid var(--amber-line);
  font-size:.88rem;color:#92400e;padding:10px 0;
}
.disclosure-banner a{color:#92400e;font-weight:700;text-decoration:underline}

/* ---------- Newsletter ---------- */
.newsletter{background:linear-gradient(135deg,#312e81,#6d28d9);border-radius:20px;padding:44px 32px;color:#fff;text-align:center;margin:48px 0}
.newsletter h2{margin-top:0;color:#fff}
.newsletter p{color:#e0e7ff;max-width:560px;margin:0 auto 20px}
.newsletter-form{display:flex;gap:10px;max-width:480px;margin:0 auto;flex-wrap:wrap;justify-content:center}
.newsletter-form input[type=email]{flex:1;min-width:220px;padding:13px 18px;border-radius:12px;border:none;font-size:1rem}
.newsletter-form button{background:#fff;color:var(--primary-dark);font-weight:800;border:none;border-radius:12px;padding:13px 26px;font-size:1rem;cursor:pointer}
.newsletter-form button:hover{background:#e0e7ff}
.newsletter small{display:block;margin-top:12px;color:#c4b5fd;font-size:.82rem}

/* ---------- Quiz ---------- */
.quiz{background:#fff;border:1px solid var(--line);border-radius:20px;padding:36px;max-width:720px;margin:28px auto;box-shadow:var(--shadow)}
.quiz-progress{height:8px;background:var(--bg-soft);border-radius:999px;margin-bottom:26px;overflow:hidden}
.quiz-progress-bar{height:100%;width:0;background:linear-gradient(90deg,var(--primary),var(--accent));border-radius:999px;transition:width .35s ease}
.quiz-q{font-size:1.35rem;font-weight:800;margin-bottom:20px}
.quiz-opts{display:grid;gap:12px}
.quiz-opt{
  text-align:left;background:var(--bg-soft);border:2px solid var(--line);border-radius:12px;
  padding:15px 20px;font-size:1rem;font-weight:600;color:var(--ink);cursor:pointer;font-family:inherit;
}
.quiz-opt:hover{border-color:var(--primary);background:var(--bg-tint)}
.quiz-result h2{margin-top:0}
.quiz-result .card{margin:18px 0}
.quiz-restart{background:none;border:1px solid var(--line);border-radius:10px;padding:10px 22px;font-size:.95rem;cursor:pointer;color:var(--muted);margin-top:14px}
.quiz-restart:hover{border-color:var(--primary);color:var(--primary)}
.quiz-step{font-size:.85rem;color:var(--muted);margin-bottom:8px;font-weight:600}

/* ---------- Misc ---------- */
.meta{font-size:.85rem;color:var(--muted);border-top:1px solid var(--line);padding-top:16px;margin-top:44px}
.breadcrumb{font-size:.88rem;color:var(--muted);margin:22px 0 0}
.breadcrumb a{color:var(--muted)}
.note-box{background:var(--bg-tint);border:1px solid #c7d2fe;border-radius:12px;padding:16px 20px;margin:20px 0;font-size:.96rem}
.note-box strong{color:var(--primary-dark)}
.toc{background:var(--bg-soft);border:1px solid var(--line);border-radius:var(--radius);padding:20px 24px;margin:24px 0}
.toc h2,.toc h3{margin-top:0;font-size:1.05rem}
.toc ol{margin-bottom:0}
.toc a{font-weight:600}
.two-col{display:grid;grid-template-columns:1fr 1fr;gap:28px;align-items:start}
.check-list{list-style:none;padding:0}
.check-list li{padding-left:1.7em;position:relative;margin-bottom:10px}
.check-list li::before{content:"✓";position:absolute;left:0;color:var(--primary);font-weight:800}
.stat-row{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:16px;margin:26px 0}
.stat{background:#fff;border:1px solid var(--line);border-radius:12px;padding:18px;text-align:center}
.stat .stat-num{font-size:1.7rem;font-weight:800;color:var(--primary)}
.stat .stat-label{font-size:.85rem;color:var(--muted)}

/* ---------- Footer ---------- */
.site-footer{background:#0f172a;color:#cbd5e1;margin-top:64px;font-size:.94rem}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:32px;padding:52px 0 36px}
.footer-brand p{color:#94a3b8;font-size:.92rem}
.footer-brand .brand{color:#fff;margin-bottom:12px}
.site-footer h4{color:#fff;font-size:.85rem;text-transform:uppercase;letter-spacing:.07em;margin:0 0 14px}
.footer-links{list-style:none;margin:0;padding:0}
.footer-links li{margin-bottom:9px}
.footer-links a{color:#94a3b8}
.footer-links a:hover{color:#fff}
.social-row{display:flex;gap:10px;margin-top:16px}
.social-row a{display:inline-flex;align-items:center;justify-content:center;width:38px;height:38px;border-radius:10px;background:#1e293b;color:#cbd5e1}
.social-row a:hover{background:var(--primary);color:#fff;text-decoration:none}
.social-row svg{width:18px;height:18px;fill:currentColor}
.footer-bottom{border-top:1px solid #1e293b;padding:20px 0;font-size:.82rem;color:#64748b}
.footer-bottom .container{display:flex;gap:16px;flex-wrap:wrap;justify-content:space-between;align-items:center}
.footer-bottom a{color:#94a3b8}

/* ---------- Responsive ---------- */
@media (max-width:920px){
  .menu-toggle{display:block}
  .nav-links{
    display:none;position:absolute;top:66px;left:0;right:0;background:#fff;flex-direction:column;
    align-items:stretch;border-bottom:1px solid var(--line);box-shadow:var(--shadow);padding:10px 16px 18px;gap:2px;
  }
  .site-header.nav-open .nav-links{display:flex}
  .nav-links a{padding:12px 10px}
  .has-drop>.drop{position:static;box-shadow:none;border:none;padding:0 0 0 14px;display:none}
  .has-drop.drop-open>.drop{display:block}
  .footer-grid{grid-template-columns:1fr 1fr}
  .two-col{grid-template-columns:1fr}
}
@media (max-width:640px){
  body{font-size:16px}
  .section{padding:36px 0}
  .hero{padding:44px 0 40px}
  .pros-cons{grid-template-columns:1fr}
  .rank-item{padding:20px}
  .quiz{padding:24px 18px}
  .newsletter{padding:32px 20px}
  .footer-grid{grid-template-columns:1fr}
  .newsletter-form input[type=email]{min-width:0}
}