/* CryptoMathly — design system
   Dark by default, light theme via [data-theme="light"] or system preference. */
:root{
  --bg:#0A0F1C; --bg-2:#0D1424; --surface:#111A2C; --surface-2:#16213A; --border:#22304D;
  --text:#E7ECF5; --muted:#97A3BA; --faint:#6B7891;
  --primary:#2DD4A4; --primary-strong:#16B98C; --primary-ink:#04241B;
  --gold:#F5B83D; --gold-soft:rgba(245,184,61,.12);
  --pos:#34D399; --neg:#FB7185; --warn:#FBBF24;
  --ring:rgba(45,212,164,.35);
  --shadow:0 10px 30px -12px rgba(0,0,0,.55);
  --radius:16px; --radius-sm:10px;
  --font:"Manrope",system-ui,-apple-system,"Segoe UI",Roboto,"PingFang SC","Microsoft YaHei","Noto Sans SC",sans-serif;
  color-scheme:dark;
}
:root[data-theme="light"]{
  --bg:#F6F8FC; --bg-2:#EEF2F9; --surface:#FFFFFF; --surface-2:#F3F6FB; --border:#DDE4EF;
  --text:#0F172A; --muted:#51607A; --faint:#7A879E;
  --primary:#0EA47A; --primary-strong:#0B8A66; --primary-ink:#FFFFFF;
  --gold:#C98A0C; --gold-soft:rgba(201,138,12,.10);
  --pos:#059669; --neg:#E11D48; --warn:#B45309;
  --ring:rgba(14,164,122,.3);
  --shadow:0 10px 30px -16px rgba(15,23,42,.25);
  color-scheme:light;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--text);font-family:var(--font);font-size:16.5px;line-height:1.65;
  background-image:radial-gradient(900px 420px at 85% -10%,rgba(45,212,164,.10),transparent 60%),radial-gradient(700px 380px at -10% 10%,rgba(245,184,61,.07),transparent 60%);
  background-repeat:no-repeat}
:root[data-theme="light"] body{background-image:radial-gradient(900px 420px at 85% -10%,rgba(14,164,122,.08),transparent 60%)}
a{color:var(--primary);text-decoration:none}
a:hover{text-decoration:underline}
img,svg{max-width:100%}
.container{max-width:1160px;margin:0 auto;padding:0 20px}
.skip{position:absolute;left:-9999px}.skip:focus{left:12px;top:12px;z-index:99;background:var(--surface);padding:8px 12px;border-radius:8px}

/* Header */
.site-header{position:sticky;top:0;z-index:40;backdrop-filter:saturate(160%) blur(12px);background:color-mix(in srgb,var(--bg) 82%,transparent);border-bottom:1px solid var(--border)}
.nav{display:flex;align-items:center;gap:18px;height:66px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:1.18rem;color:var(--text);letter-spacing:-.02em}
.brand:hover{text-decoration:none}
.brand b{color:var(--primary)}
.brand svg{width:34px;height:34px;flex:none}
.nav-links{display:flex;gap:4px;margin-left:auto;align-items:center}
.nav-links>a,.dd>button{color:var(--muted);font-weight:600;font-size:.95rem;padding:8px 12px;border-radius:10px;background:none;border:0;cursor:pointer;font-family:inherit}
.nav-links>a:hover,.dd>button:hover,.nav-links>a[aria-current]{color:var(--text);background:var(--surface-2);text-decoration:none}
.dd{position:relative}
.dd-menu{position:absolute;top:calc(100% + 8px);left:0;min-width:270px;background:var(--surface);border:1px solid var(--border);border-radius:14px;padding:8px;box-shadow:var(--shadow);display:none}
.dd.open .dd-menu,.dd:focus-within .dd-menu{display:block}
.dd-menu a{display:flex;gap:10px;align-items:center;padding:9px 10px;border-radius:9px;color:var(--text);font-weight:600;font-size:.93rem}
.dd-menu a:hover{background:var(--surface-2);text-decoration:none}
.dd-menu .ico{width:30px;height:30px;font-size:15px}
.tools{display:flex;gap:8px;align-items:center}
.lang-select,.icon-btn{height:38px;border-radius:10px;border:1px solid var(--border);background:var(--surface);color:var(--text);font-family:inherit;font-weight:600;font-size:.88rem}
.lang-select{padding:0 8px;cursor:pointer}
.icon-btn{width:38px;display:grid;place-items:center;cursor:pointer}
.icon-btn svg{width:18px;height:18px}
.menu-btn{display:none}
@media (max-width:900px){
  .menu-btn{display:grid}
  .nav-links{position:fixed;inset:66px 0 auto 0;flex-direction:column;align-items:stretch;background:var(--bg-2);border-bottom:1px solid var(--border);padding:12px 16px 18px;display:none;max-height:calc(100vh - 66px);overflow:auto}
  .nav-links.open{display:flex}
  .dd-menu{position:static;display:block;box-shadow:none;border:0;padding:0 0 0 6px;background:transparent}
  .dd>button{display:none}
  .tools{margin-left:auto}
}

/* Typography */
h1,h2,h3{line-height:1.2;letter-spacing:-.02em;margin:0 0 .5em}
h1{font-size:clamp(1.9rem,3.6vw,2.8rem);font-weight:800}
h2{font-size:clamp(1.35rem,2.2vw,1.7rem);font-weight:800;margin-top:1.6em}
h3{font-size:1.15rem;font-weight:700;margin-top:1.4em}
p{margin:0 0 1em}
.lead{font-size:1.12rem;color:var(--muted);max-width:760px}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:.8rem;font-weight:700;text-transform:uppercase;letter-spacing:.08em;color:var(--gold);background:var(--gold-soft);padding:5px 11px;border-radius:999px;margin-bottom:14px}
.muted{color:var(--muted)}
.small{font-size:.88rem}

/* Hero */
.hero{padding:64px 0 34px}
.hero h1{max-width:860px}
.hero h1 span{background:linear-gradient(90deg,var(--primary),var(--gold));-webkit-background-clip:text;background-clip:text;color:transparent}
.hero-cta{display:flex;gap:12px;flex-wrap:wrap;margin-top:24px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;height:46px;padding:0 20px;border-radius:12px;font-weight:700;font-family:inherit;font-size:.98rem;border:1px solid transparent;cursor:pointer;transition:transform .12s,background .15s}
.btn:hover{text-decoration:none;transform:translateY(-1px)}
.btn-primary{background:var(--primary);color:var(--primary-ink)}
.btn-primary:hover{background:var(--primary-strong)}
.btn-ghost{background:var(--surface);border-color:var(--border);color:var(--text)}
.btn-sm{height:34px;padding:0 12px;font-size:.85rem;border-radius:9px}
.trust{display:flex;gap:22px;flex-wrap:wrap;margin-top:26px;color:var(--muted);font-size:.92rem}
.trust span::before{content:"✓";color:var(--primary);font-weight:800;margin-right:7px}

/* Ticker */
.ticker{display:flex;gap:10px;overflow-x:auto;padding:4px 0 2px;scrollbar-width:none}
.ticker::-webkit-scrollbar{display:none}
.tick{flex:none;display:flex;gap:10px;align-items:center;background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:8px 12px;font-size:.88rem;font-variant-numeric:tabular-nums}
.tick b{font-weight:800}
.up{color:var(--pos)}.down{color:var(--neg)}

/* Cards */
.grid{display:grid;gap:18px}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-2{grid-template-columns:repeat(2,1fr)}
@media (max-width:900px){.grid-3{grid-template-columns:repeat(2,1fr)}}
@media (max-width:620px){.grid-3,.grid-2{grid-template-columns:1fr}}
.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:22px}
a.card{display:block;color:var(--text);transition:border-color .15s,transform .15s}
a.card:hover{border-color:var(--primary);transform:translateY(-2px);text-decoration:none}
.card h3{margin:.7em 0 .35em;font-size:1.08rem}
.card p{color:var(--muted);font-size:.95rem;margin:0}
.ico{display:grid;place-items:center;width:44px;height:44px;border-radius:12px;font-size:20px;background:var(--gold-soft);color:var(--gold);font-weight:800}
.ico.g{background:rgba(45,212,164,.12);color:var(--primary)}
.card .more{display:inline-block;margin-top:12px;font-weight:700;font-size:.9rem;color:var(--primary)}
.section{padding:34px 0}
.section-head{display:flex;justify-content:space-between;align-items:end;gap:16px;margin-bottom:18px}
.section-head h2{margin:0}

/* Calculator */
.crumbs{font-size:.86rem;color:var(--faint);padding:22px 0 6px}
.crumbs a{color:var(--muted)}
.calc-head{padding:6px 0 18px}
.calc{display:grid;grid-template-columns:1.05fr .95fr;gap:20px;align-items:start}
@media (max-width:900px){.calc{grid-template-columns:1fr}}
.panel{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow)}
.panel h2{margin:0 0 14px;font-size:1.1rem}
.results{position:sticky;top:84px;background:linear-gradient(180deg,var(--surface-2),var(--surface))}
.fields{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.fields .full{grid-column:1/-1}
@media (max-width:520px){.fields{grid-template-columns:1fr}}
.field label{display:block;font-size:.84rem;font-weight:700;color:var(--muted);margin-bottom:6px}
.input-wrap{position:relative;display:flex;align-items:center}
.input-wrap .affix{position:absolute;color:var(--faint);font-size:.9rem;font-weight:600;pointer-events:none}
.input-wrap .pre{left:12px}.input-wrap .suf{right:12px}
.field input,.field select{width:100%;height:46px;border-radius:11px;border:1px solid var(--border);background:var(--bg-2);color:var(--text);font-family:inherit;font-size:1rem;font-weight:600;padding:0 12px;font-variant-numeric:tabular-nums;transition:border-color .15s,box-shadow .15s}
.field input.has-pre{padding-left:30px}.field input.has-suf{padding-right:62px}
.field input:focus,.field select:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 4px var(--ring)}
.field .hint{font-size:.78rem;color:var(--faint);margin-top:5px}
.seg{display:flex;background:var(--bg-2);border:1px solid var(--border);border-radius:11px;padding:4px;gap:4px}
.seg button{flex:1;height:36px;border:0;border-radius:8px;background:none;color:var(--muted);font-family:inherit;font-weight:700;cursor:pointer;font-size:.9rem}
.seg button[aria-pressed="true"]{background:var(--surface-2);color:var(--text);box-shadow:inset 0 0 0 1px var(--border)}
.check{display:flex;align-items:center;gap:9px;font-size:.92rem;color:var(--muted);font-weight:600;cursor:pointer}
.check input{width:18px;height:18px;accent-color:var(--primary)}
.row-actions{display:flex;gap:8px;flex-wrap:wrap;margin-top:16px}
.live-note{font-size:.8rem;color:var(--faint);margin-top:8px;min-height:1.2em}
.big{font-size:clamp(1.9rem,4vw,2.5rem);font-weight:800;letter-spacing:-.02em;font-variant-numeric:tabular-nums;line-height:1.1}
.big-label{font-size:.82rem;font-weight:700;color:var(--muted);text-transform:uppercase;letter-spacing:.06em}
.kpis{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:18px}
.kpi{background:var(--bg-2);border:1px solid var(--border);border-radius:12px;padding:12px 14px}
.kpi span{display:block;font-size:.78rem;color:var(--muted);font-weight:700}
.kpi b{display:block;font-size:1.08rem;font-variant-numeric:tabular-nums;margin-top:2px;word-break:break-word}
.pos{color:var(--pos)}.neg{color:var(--neg)}
.alert{border-radius:11px;padding:10px 13px;font-size:.88rem;margin-top:14px;border:1px solid}
.alert.warn{background:rgba(251,191,36,.08);border-color:rgba(251,191,36,.35);color:var(--warn)}
.alert.info{background:rgba(45,212,164,.07);border-color:rgba(45,212,164,.3);color:var(--muted)}
.chart{margin-top:16px;background:var(--bg-2);border:1px solid var(--border);border-radius:12px;padding:10px}
.chart svg{display:block;width:100%;height:auto}
.legend{display:flex;gap:14px;font-size:.8rem;color:var(--muted);padding:4px 6px 0}
.legend i{display:inline-block;width:10px;height:10px;border-radius:3px;margin-right:6px;vertical-align:-1px}
table.data{width:100%;border-collapse:collapse;font-size:.88rem;font-variant-numeric:tabular-nums;margin-top:14px}
table.data th,table.data td{padding:8px 10px;border-bottom:1px solid var(--border);text-align:right}
table.data th:first-child,table.data td:first-child{text-align:left}
table.data th{color:var(--muted);font-weight:700;font-size:.8rem}
.table-wrap{overflow-x:auto}

/* Prose */
.layout{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:36px;padding:30px 0 10px}
@media (max-width:980px){.layout{grid-template-columns:1fr}}
.prose{max-width:760px}
.prose h2{scroll-margin-top:90px}
.prose ul,.prose ol{padding-left:1.3em;margin:0 0 1em}
.prose li{margin:.3em 0}
.prose table{width:100%;border-collapse:collapse;margin:1em 0 1.4em;font-size:.94rem}
.prose th,.prose td{border:1px solid var(--border);padding:9px 11px;text-align:left}
.prose th{background:var(--surface-2)}
.prose blockquote{margin:1.2em 0;padding:12px 16px;border-left:3px solid var(--gold);background:var(--gold-soft);border-radius:0 10px 10px 0}
.prose code{background:var(--surface-2);padding:2px 6px;border-radius:6px;font-size:.9em}
.formula{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;background:var(--surface-2);border:1px solid var(--border);border-radius:10px;padding:12px 14px;margin:0 0 1em;overflow-x:auto;font-size:.92rem}
.aside{position:sticky;top:86px;display:grid;gap:16px;align-content:start}
.aside .card h3{margin-top:0;font-size:1rem}
.aside ul{list-style:none;margin:0;padding:0}
.aside li{padding:7px 0;border-bottom:1px solid var(--border);font-size:.92rem}
.aside li:last-child{border:0}
.faq details{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:0 16px;margin-bottom:10px}
.faq summary{cursor:pointer;font-weight:700;padding:14px 0;list-style:none;display:flex;justify-content:space-between;gap:12px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";color:var(--primary);font-weight:800;font-size:1.2rem}
.faq details[open] summary::after{content:"–"}
.faq details p{color:var(--muted);margin:0 0 14px}

/* Blog */
.post-meta{display:flex;gap:14px;flex-wrap:wrap;color:var(--faint);font-size:.88rem;margin:4px 0 18px}
.tag{display:inline-block;font-size:.75rem;font-weight:700;padding:3px 9px;border-radius:999px;background:rgba(45,212,164,.12);color:var(--primary)}
.post-card h3{margin:.55em 0 .35em;font-size:1.05rem;line-height:1.35}
.toc{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:14px 18px;margin:0 0 1.6em}
.toc b{font-size:.85rem;text-transform:uppercase;letter-spacing:.06em;color:var(--muted)}
.toc ol{margin:.5em 0 0;padding-left:1.2em;font-size:.94rem}
.cta-box{display:flex;gap:16px;align-items:center;justify-content:space-between;flex-wrap:wrap;background:linear-gradient(120deg,rgba(45,212,164,.12),rgba(245,184,61,.10));border:1px solid var(--border);border-radius:var(--radius);padding:20px 22px;margin:1.6em 0}
.cta-box p{margin:0;font-weight:700}
.filters{display:flex;gap:8px;flex-wrap:wrap;margin:0 0 20px}
.filters button{border:1px solid var(--border);background:var(--surface);color:var(--muted);border-radius:999px;padding:7px 14px;font-family:inherit;font-weight:700;cursor:pointer;font-size:.86rem}
.filters button[aria-pressed="true"]{background:var(--primary);color:var(--primary-ink);border-color:var(--primary)}
.note-lang{font-size:.85rem;color:var(--faint)}

/* Footer */
.site-footer{margin-top:50px;border-top:1px solid var(--border);background:var(--bg-2);padding:40px 0 26px;font-size:.92rem}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:26px}
@media (max-width:800px){.foot-grid{grid-template-columns:1fr 1fr}}
.site-footer h4{font-size:.82rem;text-transform:uppercase;letter-spacing:.08em;color:var(--muted);margin:0 0 10px}
.site-footer ul{list-style:none;padding:0;margin:0}
.site-footer li{margin:6px 0}
.site-footer a{color:var(--text)}
.disclaimer-line{border-top:1px solid var(--border);margin-top:26px;padding-top:16px;color:var(--faint);font-size:.82rem}
.visually-hidden{position:absolute!important;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}
@media (max-width:480px){
  .nav{gap:8px}
  .brand{font-size:1.02rem;gap:8px}
  .brand svg{width:30px;height:30px}
  .lang-select{max-width:96px;font-size:.82rem;padding:0 4px}
  .tools{gap:6px}
  .icon-btn{width:36px}
  .container{padding:0 16px}
  .panel{padding:18px}
}