:root{
  --bg:#0b0d10;
  --bg-alt:#12161d;
  --surface:#11151a;
  --surface-2:#171d25;
  --surface-3:#1d2530;
  --text:#eef2f7;
  --muted:#aeb7c2;
  --line:#293241;
  --link:#8ab4f8;
  --button:#8ab4f8;
  --button-text:#0b0d10;
  --header-h:72px;
  --footer-h:42px;
  --shadow:0 12px 28px rgba(0,0,0,.24);
}
html[data-theme="light"]{
  --bg:#ffffff;
  --bg-alt:#f6f8fb;
  --surface:#ffffff;
  --surface-2:#f1f3f4;
  --surface-3:#e9edf1;
  --text:#1f1f1f;
  --muted:#5f6368;
  --line:#dadce0;
  --link:#1a73e8;
  --button:#0b57d0;
  --button-text:#ffffff;
  --shadow:0 1px 3px rgba(0,0,0,.08), 0 4px 18px rgba(0,0,0,.06);
}
*{box-sizing:border-box}
html,body{height:100%}
body{margin:0;font-family:Arial,Helvetica,sans-serif;background:var(--bg);color:var(--text);overflow-y:scroll}
a{color:var(--link);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%;display:block}
button,input,select{font:inherit}
.site-shell{min-height:100vh}
.site-header{position:fixed;top:0;left:0;right:0;height:var(--header-h);z-index:1000;background:color-mix(in srgb, var(--bg) 92%, transparent);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.header-inner{height:100%;max-width:1480px;margin:0 auto;padding:0 16px;display:flex;align-items:center;gap:16px}
.brand-wrap{flex:0 0 auto;min-width:0}
.brand-link{display:flex;align-items:center;gap:10px;color:var(--text);text-decoration:none}
.brand-mark{display:none;width:36px;height:36px;border-radius:50%;object-fit:cover;background:var(--surface-2)}
.brand-logo{display:block;height:34px;width:auto;max-width:min(32vw,320px);object-fit:contain}
.brand-text{display:none;font-size:28px;font-weight:700;letter-spacing:-.04em}
.brand-logo.is-missing + .brand-text{display:block}
.site-nav{flex:1 1 auto;display:flex;align-items:center;gap:6px;min-width:0;white-space:nowrap;overflow:auto;scrollbar-width:none}
.site-nav::-webkit-scrollbar{display:none}
.site-nav a{padding:8px 12px;border-radius:999px;color:var(--text);text-decoration:none;font-size:14px;flex:0 0 auto}
.site-nav a.active,.site-nav a:hover{background:var(--surface-2);text-decoration:none}
.header-actions{flex:0 0 auto;display:flex;align-items:center;gap:8px}
.theme-toggle,.signin-btn,.hamburger-btn{border:1px solid var(--line);background:var(--surface);color:var(--text);padding:9px 12px;border-radius:999px;cursor:pointer;text-decoration:none;font-size:14px}
.signin-btn{background:var(--button);border-color:var(--button);color:var(--button-text);font-weight:700}
.hamburger-btn{display:none;width:42px;height:42px;padding:0;border-radius:14px}
.page-main{max-width:1480px;margin:0 auto;padding:calc(var(--header-h) + 18px) 16px calc(var(--footer-h) + 20px);min-height:100vh}
.page-section{margin-bottom:18px}
.card{background:var(--surface);border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow)}
.hero-banner{background:linear-gradient(180deg,rgba(0,0,0,.04),rgba(0,0,0,.28)), url('../img/cosmality-banner.jpeg') center/cover no-repeat;border-radius:20px;min-height:220px;border:1px solid var(--line)}
.button{display:inline-flex;align-items:center;justify-content:center;border-radius:999px;padding:11px 18px;border:1px solid var(--line);background:var(--surface);color:var(--text);font-weight:700;cursor:pointer;text-decoration:none}
.button.primary{background:var(--button);border-color:var(--button);color:var(--button-text)}
.muted{color:var(--muted)}
.footer{position:fixed;left:0;right:0;bottom:0;z-index:1000;height:var(--footer-h);display:flex;align-items:center;background:color-mix(in srgb, var(--bg) 92%, transparent);backdrop-filter:blur(12px);border-top:1px solid var(--line);color:var(--muted);font-size:13px}
.footer-inner{max-width:1480px;margin:0 auto;padding:0 16px;display:grid;grid-template-columns:1fr auto 1fr;gap:12px;align-items:center;width:100%}
.footer-left{text-align:left;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.footer-center{text-align:center;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.footer-right{text-align:right;white-space:nowrap}
.footer-right a{color:var(--muted)}
.text-input,.password-input,.search-input,select{width:100%;border:1px solid var(--line);background:var(--surface);color:var(--text);border-radius:999px;padding:13px 18px;font-size:16px;outline:none}
.text-input:focus,.password-input:focus,.search-input:focus,select:focus{border-color:var(--link)}
.search-shell{display:flex;align-items:center;border:1px solid var(--line);border-radius:999px;background:var(--surface);box-shadow:var(--shadow);overflow:hidden}
.search-shell input{border:none;background:transparent;box-shadow:none}
.search-go{appearance:none;border:none;background:transparent;color:var(--muted);font-size:22px;padding:0 18px;cursor:pointer}
@media (max-width:980px){
  :root{--header-h:64px;--footer-h:52px}
  .brand-logo{display:none}
  .brand-mark{display:block}
  .brand-text{font-size:24px}
  .footer-inner{grid-template-columns:1fr;gap:4px;padding-top:4px;padding-bottom:4px}
  .footer{height:auto;min-height:var(--footer-h)}
}
@media (max-width:820px){
  .site-nav{display:none;position:fixed;top:var(--header-h);left:12px;right:12px;background:var(--surface);border:1px solid var(--line);border-radius:18px;padding:10px;flex-direction:column;align-items:stretch;overflow:visible;white-space:normal;box-shadow:var(--shadow)}
  .site-nav.open{display:flex}
  .site-nav a{padding:12px 14px;border-radius:12px}
  .hamburger-btn{display:inline-flex;align-items:center;justify-content:center}
  .theme-toggle{padding:8px 10px}
  .signin-btn{padding:8px 12px}
  .header-inner{gap:10px;padding:0 12px}
  .page-main{padding:calc(var(--header-h) + 14px) 12px calc(var(--footer-h) + 18px)}
}