:root{
  --teal:#0d9488;--teal-dark:#0f766e;--ink:#18181b;--body:#3f3f46;
  --muted:#71717a;--line:#e4e4e7;--bg:#ffffff;--soft:#f4f4f5;--soft2:#fafafa;
  --maxw:760px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;color:var(--body);background:var(--bg);
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  font-size:17px;line-height:1.7;-webkit-font-smoothing:antialiased;
}
a{color:var(--teal);text-decoration:none}
a:hover{color:var(--teal-dark);text-decoration:underline}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 22px}

/* header */
.site-header{border-bottom:1px solid var(--line);background:rgba(255,255,255,.85);backdrop-filter:blur(8px);position:sticky;top:0;z-index:10}
.site-header .wrap{display:flex;align-items:center;justify-content:space-between;height:60px}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;color:var(--ink);font-size:18px}
.brand:hover{text-decoration:none;color:var(--ink)}
.brand .mark{display:inline-flex;align-items:center;justify-content:center;width:30px;height:30px;border-radius:8px;background:var(--teal);color:#fff;font-size:17px}
.nav a{color:var(--body);font-size:15px;font-weight:500;margin-left:20px}

/* language switcher (matches chesster.io) */
.nav{display:flex;align-items:center}
.lang{position:relative;margin-left:20px}
.lang-btn{display:inline-flex;align-items:center;gap:7px;padding:6px 12px;border:1px solid var(--line);border-radius:9999px;background:var(--soft2);color:var(--body);font:inherit;font-size:14px;font-weight:600;cursor:pointer;transition:.15s}
.lang-btn:hover{background:var(--soft);border-color:var(--teal)}
.lang-btn .globe{font-size:15px;line-height:1}
.lang-btn .chev{width:14px;height:14px;transition:transform .15s}
.lang.open .lang-btn .chev{transform:rotate(180deg)}
.lang-menu{position:absolute;top:calc(100% + 8px);right:0;min-width:168px;background:#fff;border:1px solid var(--line);border-radius:12px;box-shadow:0 10px 30px rgba(24,24,27,.12);overflow:hidden;z-index:50;display:none}
.lang.open .lang-menu{display:block}
.lang-opt{display:flex;align-items:center;gap:10px;width:100%;padding:11px 14px;background:none;border:0;font:inherit;font-size:14.5px;color:var(--body);text-align:left;cursor:pointer;transition:.12s}
.lang-opt:hover{background:#f0fdfa}
.lang-opt[aria-selected="true"]{background:#f0fdfa;color:var(--teal-dark);font-weight:600}
.lang-opt .flag{font-size:17px;line-height:1}
.lang-opt .check{width:15px;height:15px;margin-left:auto;color:var(--teal)}
[data-i18n-hide]{display:none}

/* hero (index) */
.hero{padding:72px 0 40px;text-align:center}
.hero h1{color:var(--ink);font-size:38px;line-height:1.15;margin:0 0 12px;letter-spacing:-.02em}
.hero p{color:var(--muted);font-size:19px;max-width:520px;margin:0 auto}
.cards{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin:44px 0 80px}
@media(max-width:640px){.cards{grid-template-columns:1fr}.hero h1{font-size:30px}}
.card{display:block;border:1px solid var(--line);border-radius:14px;padding:22px 22px;background:var(--soft2);transition:.15s}
.card:hover{border-color:var(--teal);text-decoration:none;transform:translateY(-2px);box-shadow:0 6px 24px rgba(13,148,136,.08)}
.card h3{margin:0 0 6px;color:var(--ink);font-size:17px}
.card p{margin:0;color:var(--muted);font-size:14.5px}

/* legal doc */
.doc{padding:52px 0 40px}
.doc h1{color:var(--ink);font-size:34px;letter-spacing:-.02em;margin:0 0 6px}
.doc .meta{color:var(--muted);font-size:14.5px;margin:0 0 8px}
.lead{font-size:18px;color:var(--body);border-left:3px solid var(--teal);padding:2px 0 2px 18px;margin:26px 0 30px}
.toc{background:var(--soft);border:1px solid var(--line);border-radius:12px;padding:20px 24px;margin:0 0 40px}
.toc strong{display:block;color:var(--ink);font-size:13px;text-transform:uppercase;letter-spacing:.06em;margin-bottom:10px}
.toc ol{margin:0;padding-left:20px;columns:2;column-gap:32px}
@media(max-width:600px){.toc ol{columns:1}}
.toc li{margin:3px 0;font-size:14.5px}
.doc h2{color:var(--ink);font-size:22px;letter-spacing:-.01em;margin:44px 0 12px;padding-top:14px;scroll-margin-top:74px}
.doc h3{color:var(--ink);font-size:17px;margin:26px 0 8px}
.doc p{margin:12px 0}
.doc ul{margin:12px 0;padding-left:22px}
.doc li{margin:7px 0}
.doc strong{color:var(--ink)}
hr{border:none;border-top:1px solid var(--line);margin:16px 0 0}
table.contact{border-collapse:collapse;margin:14px 0;font-size:15.5px}
table.contact td{padding:6px 18px 6px 0;vertical-align:top}
table.contact td:first-child{color:var(--muted);white-space:nowrap}
.note{background:#f0fdfa;border:1px solid #99f6e4;border-radius:10px;padding:14px 18px;font-size:15px;margin:20px 0;color:#134e4a}
.top-link{display:inline-block;font-size:13px;color:var(--muted);margin-top:6px}

/* footer */
.site-footer{border-top:1px solid var(--line);background:var(--soft2);padding:32px 0;margin-top:40px}
.site-footer .wrap{display:flex;flex-wrap:wrap;gap:8px 22px;align-items:center;justify-content:space-between}
.site-footer p{margin:0;color:var(--muted);font-size:14px}
.site-footer nav a{color:var(--body);font-size:14px;margin-left:18px}
@media(max-width:640px){.site-footer nav a{margin:0 16px 0 0}}