:root{--navy:#0b1f3f;--blue:#1747e0;--yellow:#ffc928;--ink:#0b1f3f;--muted:#51607a;--bg:#f4f8ff;--line:#e3e9f5;--radius:16px}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:'Poppins',system-ui,-apple-system,Segoe UI,Roboto,sans-serif;color:var(--ink);background:#fff;line-height:1.55}
a{color:inherit;text-decoration:none}
h1,h2,h3{line-height:1.15;margin:0}
.wrap{max-width:1200px;margin:0 auto;padding:0 24px}
:focus-visible{outline:3px solid var(--yellow);outline-offset:2px}

/* buttons */
.btn{display:inline-block;border:0;border-radius:999px;padding:12px 24px;font:600 15px/1 'Poppins',sans-serif;cursor:pointer;transition:transform .15s}
.btn:hover{transform:translateY(-1px)}
.btn-yellow{background:var(--yellow);color:var(--navy)}
.btn-outline{background:#fff;color:var(--blue);border:1.5px solid var(--blue)}

/* header */
.site-header{background:var(--navy);color:#fff;position:sticky;top:0;z-index:50}
.header-in{display:flex;align-items:center;gap:28px;height:72px}
.logo{font-size:28px;font-weight:800;letter-spacing:-.5px}
.logo span{color:var(--yellow)}
.nav{display:flex;align-items:center;gap:22px;flex:1;margin-left:20px}
.nav>a,.dd-btn{color:#fff;font:500 15px 'Poppins',sans-serif;background:none;border:0;cursor:pointer;padding:8px 0}
.nav>a.active{border-bottom:3px solid var(--yellow)}
.dd{position:relative}
.dd-menu{display:none;position:absolute;top:100%;left:-12px;min-width:210px;background:#fff;color:var(--ink);border-radius:12px;padding:8px;box-shadow:0 12px 30px rgba(11,31,63,.2)}
.dd.open .dd-menu{display:block}
.dd-menu a{display:block;padding:10px 14px;border-radius:8px;font-size:14px}
.dd-menu a:hover{background:var(--bg);color:var(--blue)}
.nav-toggle{display:none;margin-left:auto;background:none;border:0;color:#fff;font-size:28px;cursor:pointer}

/* hero */
.hero{background:linear-gradient(100deg,#eaf1ff 0%,#f6f9ff 55%,#dfe9fb 100%);padding:48px 0 56px;overflow:hidden}
.hero-in{display:grid;grid-template-columns:1.25fr .75fr;gap:32px;align-items:center}
.tagline{font-size:13px;font-weight:500;letter-spacing:.06em;margin:0 0 12px;color:var(--muted)}
.hero h1{font-size:clamp(34px,5.2vw,58px);font-weight:800;letter-spacing:-1.5px}
.hero h1 em{font-style:normal;color:var(--blue)}
.lead{max-width:640px;color:#33425e;margin:18px 0 24px}
.search{display:flex;max-width:700px;background:#fff;border:1.5px solid var(--line);border-radius:999px;padding:5px;box-shadow:0 6px 20px rgba(23,71,224,.08)}
.search input{flex:1;border:0;outline:0;padding:0 20px;font:400 15px 'Poppins',sans-serif;background:none;min-width:0}
.chips{display:flex;flex-wrap:wrap;gap:10px;align-items:center;margin-top:16px;font-size:14px;font-weight:600}
.chip{background:#fff;border:1px solid var(--line);border-radius:999px;padding:6px 16px;font:400 13px 'Poppins',sans-serif;cursor:pointer}
.chip:hover{border-color:var(--blue);color:var(--blue)}

/* book stack */
.stack{display:flex;flex-direction:column;gap:6px;max-width:300px;margin-left:auto;transform:rotate(-3deg)}
.book{padding:15px 22px;border-radius:6px 10px 10px 6px;color:#fff;font-weight:700;font-size:20px;border-left:10px solid rgba(0,0,0,.25);box-shadow:0 8px 18px rgba(11,31,63,.25)}
.b1{background:#1747e0}.b2{background:#12924f}.b3{background:#e0a100;color:#fff}.b4{background:#1b5bbf}.b5{background:#6a2fc0}
.b2{margin-left:12px}.b3{margin-left:4px}.b4{margin-left:14px}

/* sections */
.section{padding:40px 24px 0}
.sec-head{display:flex;justify-content:space-between;align-items:flex-end;gap:16px;margin-bottom:20px}
.sec-head h2{font-size:30px;font-weight:700}
.sec-head p{margin:4px 0 0;color:var(--muted)}
.more{color:var(--blue);font-weight:600;font-size:15px;white-space:nowrap}

/* tinted tokens */
.t-green{background:#e6f9ef;--c:#12924f}.t-amber{background:#fff4dc;--c:#e09a00}.t-pink{background:#fde7ee;--c:#d8326a}.t-blue{background:#e4f0ff;--c:#1747e0}.t-purple{background:#eee8fd;--c:#6a2fc0}

.topics{display:grid;grid-template-columns:repeat(5,1fr);gap:16px}
.topic{position:relative;border-radius:var(--radius);padding:22px 20px 56px;border:1px solid rgba(11,31,63,.05);transition:transform .15s}
.topic:hover{transform:translateY(-3px)}
.ico{font-size:30px;display:block;margin-bottom:10px}
.topic h3{font-size:18px;font-weight:700}
.topic p{margin:6px 0 0;font-size:13px;color:var(--muted)}
.go{position:absolute;right:16px;bottom:14px;width:34px;height:34px;border-radius:50%;background:#fff;color:var(--blue);display:grid;place-items:center;font-weight:700;box-shadow:0 2px 8px rgba(11,31,63,.1)}

/* news */
.news-row{display:grid;grid-template-columns:1fr 300px;gap:24px;align-items:start}
.news-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
.news-card{border:1px solid var(--line);border-radius:14px;padding:16px;background:#fff;display:flex;flex-direction:column;gap:6px;border-left:5px solid var(--blue)}
.news-card:hover{box-shadow:0 8px 20px rgba(11,31,63,.08)}
.news-card small{color:var(--blue);font-weight:700;font-size:12px}
.news-card h3{font-size:16px;font-weight:600}
.news-card time{color:var(--muted);font-size:12px;margin-top:auto}
.bitco{background:linear-gradient(160deg,#e4f0ff,#fff2cf);border-radius:var(--radius);padding:24px;text-align:center;border:1px solid var(--line)}
.bitco h3{font-size:34px;font-weight:800;color:var(--blue)}
.soon{display:inline-block;background:var(--blue);color:#fff;border-radius:999px;padding:4px 16px;font-size:13px;margin:8px 0}
.bitco p{margin:8px 0 16px;color:var(--muted)}

/* tools */
.tools-bar{display:grid;grid-template-columns:auto 1fr auto;gap:24px;align-items:center;background:var(--bg);border-radius:var(--radius);padding:20px 24px}
.tools-title h2{font-size:22px}.tools-title p{margin:4px 0 0;font-size:13px;color:var(--muted)}
.tools-list{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}
.tool{background:#fff;border-radius:12px;padding:12px 14px;display:grid;grid-template-columns:auto 1fr;column-gap:10px;align-items:center;border:1px solid var(--line)}
.tool:hover{border-color:var(--blue)}
.dot{grid-row:span 2;width:34px;height:34px;border-radius:9px;background:var(--c)}
.tool b{font-size:14px}.tool small{font-size:12px;color:var(--muted)}

/* footer */
.site-footer{background:var(--navy);color:#cdd7ec;margin-top:56px;padding:40px 0 20px}
.foot-in{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:28px}
.site-footer h4{color:#fff;margin:0 0 10px;font-size:15px}
.site-footer a{display:block;font-size:14px;padding:3px 0}
.site-footer a:hover{color:var(--yellow)}
.site-footer .logo{color:#fff;display:inline-block}
.foot-note{border-top:1px solid rgba(255,255,255,.12);margin-top:28px;padding-top:16px;font-size:12px;color:#9fb0d3}

/* responsive */
@media (max-width:1000px){
  .topics{grid-template-columns:repeat(2,1fr)}
  .news-row{grid-template-columns:1fr}
  .tools-bar{grid-template-columns:1fr}
  .tools-list{grid-template-columns:repeat(2,1fr)}
  .hero-in{grid-template-columns:1fr}
  .stack{margin:8px 0 0;max-width:260px}
  .foot-in{grid-template-columns:1fr 1fr}
}
@media (max-width:1024px){
  .nav-toggle{display:block}
  .nav{display:none;position:absolute;top:72px;left:0;right:0;background:var(--navy);flex-direction:column;align-items:stretch;gap:0;margin:0;padding:8px 24px 20px}
  .nav.open{display:flex}
  .nav>a,.dd-btn{padding:12px 0;width:100%;text-align:left;border-bottom:1px solid rgba(255,255,255,.08)}
  .dd-menu{position:static;box-shadow:none;background:rgba(255,255,255,.06);color:#fff}
  .dd-menu a:hover{background:rgba(255,255,255,.1);color:var(--yellow)}
}
@media (max-width:560px){
  .topics,.news-grid,.tools-list,.foot-in{grid-template-columns:1fr}
  .sec-head{flex-direction:column;align-items:flex-start}
  .search{flex-direction:column;border-radius:20px;gap:6px}
  .search input{padding:12px 16px}
}
@media (prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}

/* ---- logo, language switch, sign in (mobile-first priority) ---- */
.logo img{display:block;height:36px;width:auto}
.header-in{gap:16px}
.nav{margin-left:8px}
.lang{display:flex;gap:2px;background:rgba(255,255,255,.12);border-radius:999px;padding:3px;margin-left:auto}
.lang a{color:#fff;font:600 12px/1 'Poppins',sans-serif;padding:0 12px;min-height:34px;display:grid;place-items:center;border-radius:999px;white-space:nowrap}
.lang a.on{background:var(--yellow);color:var(--navy)}
.signin{padding:11px 22px}
.nav-signin{display:none}
.search input{font-size:16px}
.page-msg{padding:64px 24px;max-width:720px}
.page-msg h1{font-size:clamp(28px,5vw,40px);margin-bottom:14px}
.page-msg p{color:var(--muted);margin:0 0 24px}
.news-card em{font-style:normal;color:var(--muted);font-size:12px;margin-top:auto}
@media (max-width:1024px){
  .nav{top:100%}
  .nav-toggle{margin-left:0;min-width:44px;min-height:44px}
  .signin{display:none}
  .nav-signin{display:block;text-align:center;margin:8px 0 4px}
}
@media (max-width:560px){
  .wrap{padding-left:16px;padding-right:16px}
  .section{padding-left:16px;padding-right:16px}
  .header-in{gap:8px;height:64px}
  .logo img{height:28px}
  .lang a{padding:0 9px;font-size:11px;min-height:32px}
  .chip{padding:10px 16px}
  .btn{min-height:44px}
  .nav>a,.dd-btn{min-height:44px}
}
@media (max-width:360px){
  .logo img{height:24px}
  .lang a{padding:0 7px;font-size:10.5px}
}

/* ---- article / topic / calculator pages ---- */
.article{max-width:860px;padding-top:24px;padding-bottom:8px}
.crumbs{font-size:13px;color:var(--muted);margin-bottom:14px}
.crumbs a{color:var(--blue)}.crumbs span{margin:0 6px}
.article h1{font-size:clamp(28px,6vw,42px);font-weight:800;letter-spacing:-.5px;margin-bottom:14px}
.article h2{font-size:22px;margin:32px 0 12px}
.answer{background:var(--bg);border-left:5px solid var(--blue);border-radius:12px;padding:16px 18px;font-size:17px;margin:0 0 10px}
.upd{font-size:12px;color:var(--muted);margin:0}
.note{font-size:13px;color:var(--muted)}
.cards{display:grid;gap:12px}
.linkcard{display:flex;flex-direction:column;gap:2px;border-radius:var(--radius);padding:16px 18px;min-height:64px;justify-content:center}
.linkcard span{font-size:13px;color:var(--muted)}
.soon-list{list-style:none;padding:0;margin:0;display:grid;gap:8px}
.soon-list li{display:flex;justify-content:space-between;gap:12px;border:1px solid var(--line);border-radius:12px;padding:12px 16px}
.soon-list em{font-style:normal;font-size:12px;color:var(--muted);white-space:nowrap}
details{border:1px solid var(--line);border-radius:12px;padding:0 16px;margin-bottom:10px;background:#fff}
summary{cursor:pointer;font-weight:600;padding:14px 0;min-height:44px}
details[open] summary{border-bottom:1px solid var(--line)}
details p{margin:12px 0 14px;color:#33425e}
.calc{display:grid;gap:22px;border:1px solid var(--line);border-radius:var(--radius);padding:18px;background:#fff;box-shadow:0 6px 20px rgba(23,71,224,.06);margin:22px 0 12px}
.field{margin-bottom:16px}
.field label{display:block;font-weight:600;font-size:14px;margin-bottom:6px}
.inp{display:flex;align-items:center;border:1.5px solid var(--line);border-radius:12px;padding:0 14px;background:#fff}
.inp:focus-within{border-color:var(--blue)}
.inp span{color:var(--muted);font-weight:600}
.inp input{flex:1;border:0;outline:0;padding:12px 8px;font:600 18px 'Poppins',sans-serif;min-width:0;background:none;color:var(--ink)}
.field input[type=range]{width:100%;margin-top:10px;accent-color:var(--blue);height:32px}
.res{display:grid;gap:16px;align-content:start}
.donut{width:160px;height:160px;border-radius:50%;margin:0 auto}
.rows{margin:0;display:grid;gap:8px}
.rows>div{display:flex;justify-content:space-between;gap:12px;align-items:baseline;padding:10px 0;border-bottom:1px solid var(--line)}
.rows dt{display:flex;align-items:center;gap:8px;font-size:14px;color:var(--muted)}
.rows dd{margin:0;font-weight:700;font-size:17px}
.rows .tot dt{color:var(--ink);font-weight:600}.rows .tot dd{font-size:22px;color:var(--blue)}
.rows i{width:12px;height:12px;border-radius:3px;display:inline-block}
.k1{background:var(--blue)}.k2{background:var(--yellow)}
@media (min-width:760px){.calc{grid-template-columns:1fr 1fr;padding:28px;gap:32px}.cards{grid-template-columns:repeat(2,1fr)}}

.plain{padding-left:20px;margin:0 0 8px}.plain li{margin-bottom:8px}.plain a{color:var(--blue);text-decoration:underline}
.soon-list a{font-weight:600;color:var(--blue)}