:root{--ink:#eaf9ff;--bg:#081a1d;--card:#0f2a2f;--muted:#9bd0d8;--brand:#3dd1c0;--brand2:#2ea6ff}
*{box-sizing:border-box}html{scroll-behavior:smooth}
body{margin:0;color:var(--ink);background:linear-gradient(180deg,#081a1d,#0a1f24);font:16px/1.6 system-ui,Segoe UI,Roboto,Helvetica,Arial}
.wrap{max-width:1120px;margin:0 auto;padding:0 20px}
.wrap.sm{max-width:860px}
.row{display:flex;gap:16px}.between{justify-content:space-between}.center{align-items:center}
.grid-2{display:grid;grid-template-columns:1.05fr .95fr;gap:28px}@media(max-width:880px){.grid-2{grid-template-columns:1fr}}
.pad{padding:48px 0}
.top{position:sticky;top:0;background:rgba(7,20,23,.7);backdrop-filter:blur(8px);border-bottom:1px solid #16333a;z-index:10}
.brand{color:#fff;text-decoration:none;font-weight:800;letter-spacing:.3px}
.menu a{color:var(--ink);opacity:.92;text-decoration:none;margin:0 10px;padding:10px 6px;border-radius:8px}
.menu a.active,.menu a:hover{background:linear-gradient(135deg,rgba(46,166,255,.22),rgba(61,209,192,.22))}
.lead{padding:56px 0 32px;border-bottom:1px solid #16333a}
.lead h1{font-size:clamp(28px,4vw,42px);line-height:1.15;margin:.2em 0}
.lead p{color:var(--muted)}
.media img{width:100%;height:auto;border-radius:16px;box-shadow:0 10px 40px rgba(0,0,0,.35)}
.btn{display:inline-block;background:linear-gradient(135deg,var(--brand2),var(--brand));color:#001b1e;padding:10px 16px;border-radius:12px;text-decoration:none;font-weight:700}
.btn.ghost{background:transparent;border:1px solid #2b6b75;color:var(--ink)}
.cards{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}@media(max-width:900px){.cards{grid-template-columns:repeat(2,1fr)}}@media(max-width:520px){.cards{grid-template-columns:1fr}}
.card{background:var(--card);border:1px solid #16333a;border-radius:14px;padding:16px}
.steps{counter-reset:s;list-style:none;padding:0;margin:0 0 24px 0}
.steps li{background:var(--card);border:1px solid #16333a;border-radius:12px;margin:10px 0;padding:12px 14px}
.grid-2.gap{gap:16px}
.panel{background:var(--card);border:1px solid #16333a;border-radius:12px;padding:16px}
.tips{list-style:disc;padding-left:20px}
.muted{color:var(--muted)}
.foot{border-top:1px solid #16333a;padding:26px 0;color:var(--muted)}
.foot-nav a{color:var(--muted);text-decoration:none;margin-right:14px}