:root{
  --bg:#0b0c10;
  --panel: rgba(255,255,255,.06);
  --panel2: rgba(0,0,0,.28);
  --border: rgba(255,255,255,.10);

  --text: rgba(255,255,255,.92);
  --muted: rgba(255,255,255,.66);
  --muted2: rgba(255,255,255,.46);

  --shadow: 0 18px 60px rgba(0,0,0,.45);
  --radius: 18px;
  --radius2: 14px;

  --good: rgba(16,185,129,.18);
  --warn: rgba(245,158,11,.18);
  --bad:  rgba(244,63,94,.18);
}

/* Fixed decorative background layer */
body::before{
  content:"";
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(900px 500px at 20% 0%, rgba(255,255,255,.06), transparent 60%),
    radial-gradient(900px 500px at 90% 10%, rgba(255,255,255,.05), transparent 60%),
    var(--bg);
}

*{ box-sizing:border-box; }
html,body{ margin:0;padding:0;height:100%;}
body{
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Arial;
  background: var(--bg);
  color: var(--text);
  line-height: 1.4;
  position: relative;
  overflow-x: hidden;
}

a{color:inherit}
.container{max-width:var(--max); margin:0 auto; padding: 18px}

.site-header{
  position: relative;
  background: rgba(11,12,16,.75);
  backdrop-filter: blur(10px);
  border-bottom:1px solid rgba(255,255,255,.06);
  z-index:10;
}
/* Header layout */
.site-header .container{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:14px;
}

.brand{
  display:flex; align-items:center; gap:10px;
  text-decoration:none; color: var(--text);
}

.brand-name{
  font-weight:900;
  letter-spacing:-0.2px;
}

.logo{
  display:flex;
  align-items:center;
  gap:8px;
  text-decoration:none;
  color:inherit;
  min-width:0;
}
.logo-img{ height:28px; width:auto; display:block; }
.logo-text{ white-space:nowrap; overflow:hidden; text-overflow:ellipsis; }
.tag{ color: var(--muted); font-size: 12px; }

/* Desktop nav */
.nav{
  display:flex;
  align-items:center;
  gap:14px;
}
.nav a{
  text-decoration:none;
  color: var(--text);
  opacity:.9;
  padding:8px 10px;
  border-radius:10px;
}
.nav a:hover{ opacity:1; background: rgba(255,255,255,.06); }

/* Hamburger button (hidden on desktop) */
.nav-toggle{
  display:none;
  width:44px;
  height:44px;
  border-radius:12px;
  border:1px solid rgba(255,255,255,.12);
  background: rgba(0,0,0,.25);
  cursor:pointer;
  align-items:center;
  justify-content:center;
  flex-direction:column;
  gap:6px;
  padding:0;
} 
.nav-toggle .bar{
  display:block;
  width:18px;
  height:2px;
  background: rgba(255,255,255,.85);
  border-radius:999px;
  transition: transform .18s ease, opacity .18s ease;
}

/* Hamburger -> X when open */
.site-header.nav-open .nav-toggle .bar:nth-child(1){
  transform: translateY(8px) rotate(45deg);
}
.site-header.nav-open .nav-toggle .bar:nth-child(2){
  opacity:0;
}
.site-header.nav-open .nav-toggle .bar:nth-child(3){
  transform: translateY(-8px) rotate(-45deg);
}

/* Mobile dropdown menu (pushes content down, unitconverter-like) */
.mobile-menu { display: none; }

@media (max-width: 860px){
  /* Hide desktop nav, show hamburger */
  .nav.nav-desktop { display: none; }
  .nav-toggle { display: inline-flex; }

  /* IMPORTANT: keep the menu in normal flow (not absolute) */
  .mobile-menu{
    display: block;          /* must be block so it can push content */
    max-height: 0;           /* collapsed */
    overflow: hidden;
    transition: max-height .22s ease;

    background: #0b0c10;     /* solid, no transparency */
    border-top: 1px solid rgba(255,255,255,.06);
  }

  /* Open state */
  .site-header.nav-open .mobile-menu{
    max-height: 500px;       /* big enough for your links */
  }

  /* Vertical list of links */
  .mobile-menu a{
    display: block;          /* makes them a vertical list */
    padding: 14px 18px;
    text-decoration: none;
    color: var(--text);
    border-bottom: 1px solid rgba(255,255,255,.06);
  }

  .mobile-menu a:hover{
    background: rgba(255,255,255,.04);
  }

  .mobile-menu a:last-child{
    border-bottom: 0;
  }
}

.page-head{
  display:flex; align-items:flex-end; justify-content:space-between;
  gap: 16px;
  padding: 22px 0 16px;
}

.hero{padding: 22px 0 10px}
.h1{ margin:0; font-size: 34px; letter-spacing: -0.03em; }
.lead{ margin: 10px 0 0; color: var(--muted); max-width: 760px; line-height: 1.55; }
.subhead{color:var(--muted); max-width: 900px; margin:0}

.head-actions{
  display:flex;
  gap:10px;
  align-items:center;
  justify-content:flex-end;
  flex-wrap:wrap;
}

/* Make buttons consistent */
.head-actions .btn{
  height:44px;
  padding:0 14px;
  border-radius:12px;
  line-height:44px; /* makes single-line text vertically centered */
  white-space:nowrap;
}

/* Mobile: stack + full width */
@media (max-width: 560px){
  .head-actions{
    justify-content:stretch;
  }
  .head-actions .btn{
    width:100%;
    justify-content:center;
    text-align:center;
  }
}


.btn{
  border: 1px solid rgba(255,255,255,.14);
  background: rgba(255,255,255,.06);
  color: var(--text);
  border-radius: 14px;
  padding: 10px 12px;
  cursor:pointer;
  font-size: 14px;
}
.btn:hover{ background: rgba(255,255,255,.10); }
.btn-primary{
  background: #fff;
  color: #000;
  border-color: rgba(255,255,255,.18);
  font-weight: 700;
}
.btn-primary:hover{ opacity:.92; }

.app-grid{
  display:grid;
  grid-template-columns: 1fr;
  gap: 14px;
  padding: 10px 0 22px;
}
@media (min-width: 1040px){
  .app-grid{ grid-template-columns: 1.05fr 1fr 1fr; }
}

.card{
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--panel);
  box-shadow: var(--shadow);
  overflow:hidden;
}
.card-head{
  padding: 16px 16px 0;
  display:flex; align-items:flex-start; justify-content:space-between;
  gap: 12px;
}
.card-title{ font-weight: 800; font-size: 16px; letter-spacing: -0.01em; }
.card-sub{ margin-top: 4px; color: var(--muted2); font-size: 13px; }

.card-body{ padding: 14px 16px 16px; display:flex; flex-direction:column; gap: 14px; }

.row{ display:grid; gap: 10px; }
.row.two{ grid-template-columns: 1fr 1fr; }
.row.three{ grid-template-columns: 1fr 1fr 1fr; }
@media (max-width: 560px){
  .row.two, .row.three{ grid-template-columns: 1fr; }
}

label{
  display:block;
  font-size: 12px;
  color: var(--muted);
  margin-bottom: 6px;
}
input[type="number"], select{
  width: 100%;
  border-radius: var(--radius2);
  border: 1px solid rgba(255,255,255,.12);
  background: rgba(0,0,0,.30);
  color: var(--text);
  padding: 10px 12px;
  outline:none;
}
input[type="number"]:focus, select:focus{ border-color: rgba(255,255,255,.22); }
input[type="range"]{ width:100%; }

.box{
  border-radius: 16px;
  border: 1px solid rgba(255,255,255,.10);
  background: var(--panel2);
  padding: 12px;
}
.kv{
  display:grid;
  grid-template-columns: 1fr auto;
  gap: 8px 10px;
  color: var(--muted);
  font-size: 13px;
}
.kv .v{ color: var(--text); text-align:right; }

.pill{
  display:inline-flex;
  align-items:center;
  padding: 8px 10px;
  border-radius: 999px;
  border: 1px solid rgba(255,255,255,.14);
  background: rgba(255,255,255,.08);
  font-size: 12px;
}
.pill.good{ background: var(--good); border-color: rgba(16,185,129,.25); color: rgba(167,243,208,1); }
.pill.warn{ background: var(--warn); border-color: rgba(245,158,11,.25); color: rgba(253,230,138,1); }
.pill.bad{  background: var(--bad);  border-color: rgba(244,63,94,.25);  color: rgba(254,205,211,1); }

.big-score{
  display:flex; align-items:baseline; justify-content:space-between;
  gap: 14px;
}
.big-score .num{ font-size: 34px; font-weight: 900; letter-spacing: -0.03em; }
.big-score .txt{ color: var(--muted); font-size: 13px; line-height: 1.5; margin-top: 6px; }

.actions{ margin: 8px 0 0; padding-left: 18px; color: var(--muted); }
.actions li{ margin: 8px 0; }
.actions strong{ color: var(--text); }

.footer{border-top:1px solid rgba(255,255,255,.06); margin-top: 26px; padding: 14px 0}
.footer-inner{display:flex; justify-content:space-between; gap:12px; flex-wrap:wrap; color: var(--muted)}
.footer-links{display:flex; gap:12px}
.footer a{color: var(--muted); text-decoration:none}
.footer a:hover{color: var(--text)}
.footer a.footer-brand{
  color: var(--accent);
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
  font-weight: 700;
}

.footer a.footer-brand:hover{
  color: var(--accent2);
}

@media (max-width: 980px){
  .grid{grid-template-columns: 1fr}
  h1{font-size: 32px}
  .value{font-size: 40px}
}

/* Footer: mobile-friendly layout */
@media (max-width: 860px){
  .footer-inner{
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }

  .footer-links{
    width: 100%;
    flex-wrap: wrap;
    gap: 10px;
  }

  .footer-links a{
    display: inline-block;
    padding: 10px 12px;        /* bigger tap target */
    border-radius: 12px;
    border: 1px solid rgba(255,255,255,.08);
    background: rgba(255,255,255,.03);
    text-decoration: none;
  }

  .footer-links a:hover{
    background: rgba(255,255,255,.06);
    border-color: rgba(124,92,255,.35);
    color: var(--text);
  }
}

@media (max-width: 860px){
  .footer-inner{
    align-items: center;
    text-align: center;
  }
  .footer-links{
    justify-content: center;
  }
}

.doc{ padding: 20px 0 30px; }
.doc-head{
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--panel);
  box-shadow: var(--shadow);
  padding: 18px;
}
.doc-card{
  margin-top: 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--panel);
  box-shadow: var(--shadow);
  padding: 16px 18px;
  color: var(--muted);
}
.doc-card h2{ margin: 0 0 10px; color: var(--text); letter-spacing: -0.02em; }
.doc-card p, .doc-card li{ line-height: 1.65; }
.doc-footer{ margin-top: 14px; }
.doc-footer a{ color: var(--text); text-decoration: underline; }

/* Learn Hub cards */
.hub-grid{
  margin-top: 12px;
  display:grid;
  grid-template-columns: 1fr;
  gap: 12px;
}
@media (min-width: 820px){
  .hub-grid{ grid-template-columns: 1fr 1fr; }
}

.hub-card{
  display:block;
  text-decoration:none;
  color: var(--text);
  border-radius: 18px;
  border: 1px solid rgba(255,255,255,.12);
  background: rgba(0,0,0,.22);
  padding: 14px;
  transition: transform .12s ease, background .12s ease, border-color .12s ease;
}
.hub-card:hover{
  transform: translateY(-1px);
  background: rgba(255,255,255,.06);
  border-color: rgba(255,255,255,.18);
}

.hub-top{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap: 10px;
}
.hub-title{
  font-weight: 850;
  letter-spacing: -0.02em;
}
.hub-desc{
  margin-top: 8px;
  color: var(--muted);
  line-height: 1.6;
}
.hub-meta{
  margin-top: 10px;
  color: rgba(255,255,255,.50);
  font-size: 12px;
}

.hub-pill{
  font-size: 12px;
  border-radius: 999px;
  padding: 6px 10px;
  border: 1px solid rgba(255,255,255,.14);
  background: rgba(255,255,255,.07);
  color: rgba(255,255,255,.86);
  white-space: nowrap;
}