:root{
  --bg: #0b0f14;
  --bg-elev: rgba(255,255,255,0.06);
  --text: #eef2f6;
  --muted: #a7b0bd;
  --brand: #4cc9f0;
  --accent: #80ffea;
  --card: rgba(255,255,255,0.06);
  --shadow: 0 10px 30px rgba(0,0,0,0.35);
  --radius: 18px;
}
@media (prefers-color-scheme: light) {
  :root{
    --bg: #f6f8fb;
    --bg-elev: #ffffff;
    --text: #0e141b;
    --muted: #475569;
    --brand: #2563eb;
    --accent: #06b6d4;
    --card: #ffffff;
    --shadow: 0 10px 30px rgba(2,6,23,0.08);
  }
}
*{ box-sizing: border-box; }
html,body{ height:100%; }
body{
  margin:0; font: 16px/1.5 system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, Noto Sans, Helvetica, Arial, "Apple Color Emoji","Segoe UI Emoji";
  color: var(--text); background: radial-gradient(1200px 800px at 10% -10%, rgba(76,201,240,0.15), transparent 45%),
                          radial-gradient(1000px 600px at 120% 10%, rgba(6,182,212,0.18), transparent 50%),
                          var(--bg);
}
.container{ max-width: 1100px; margin: 0 auto; padding: 28px 20px 80px; }
.header{ display:flex; align-items:center; justify-content:space-between; gap:16px; padding: 8px 0 20px; }
.logo{ display:flex; align-items:center; gap:14px; }
.logo img{ height:48px; width:auto; display:block; }
.logo .light { display:block; }
.logo .dark { display:none; }
@media (prefers-color-scheme: dark){
  .logo .light { display:none; }
  .logo .dark { display:block; }
}
.brand-name{ font-weight:700; letter-spacing:0.4px; font-size: 1.1rem; color: var(--muted); }
.hero{
  margin-top: 14px;
  display:grid; grid-template-columns: 1fr; gap: 18px;
  background: var(--card); border-radius: var(--radius); box-shadow: var(--shadow); padding: 26px;
  border: 1px solid rgba(255,255,255,0.08);
}
.hero h1{ font-size: clamp(28px, 4.5vw, 44px); margin:0 0 6px; line-height:1.1; }
.hero p{ margin:0; color: var(--muted); max-width: 65ch; }
.grid{ margin-top: 26px; display:grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
@media (max-width: 900px){ .grid{ grid-template-columns: 1fr; } }
.card{
  background: var(--card); border-radius: var(--radius); padding: 20px; box-shadow: var(--shadow);
  border: 1px solid rgba(255,255,255,0.08);
}
.card h3{ margin: 0 0 8px; font-size: 1.25rem; }
.card p{ margin: 0 0 14px; color: var(--muted); }
.card .actions{ display:flex; gap: 10px; flex-wrap: wrap; }
.small{ font-size: 0.9rem; color: var(--muted); }
.card.recommended{ outline: 2px solid var(--brand); }
.steps{
  margin-top: 34px; background: var(--card); border-radius: var(--radius); padding: 20px; box-shadow: var(--shadow);
  border: 1px solid rgba(255,255,255,0.08);
}
.steps h2{ margin: 0 0 10px; }
.steps ol{ margin: 0; padding-left: 18px; }
.footer{ margin-top: 36px; color: var(--muted); text-align:center; font-size: 0.9rem; }
kbd{
  background: rgba(0,0,0,0.25); padding: 2px 6px; border-radius: 6px; border:1px solid rgba(255,255,255,0.2);
}
@media (prefers-color-scheme: light){
  kbd{ background: rgba(0,0,0,0.05); border-color: rgba(0,0,0,0.08); }
}


/* --- Buttons (refined) --- */
.button{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:.5rem;
  padding: 12px 16px;
  border-radius: 14px;
  font-weight: 700;
  letter-spacing: .2px;
  text-decoration: none;
  background: linear-gradient(135deg, var(--brand), var(--accent));
  color: #ffffff !important;
  border: 0;
  box-shadow: var(--shadow);
  transform: translateZ(0);
  transition: transform .15s ease, box-shadow .15s ease, filter .2s ease;
  white-space: nowrap;
}
.button:hover{
  transform: translateY(-1px);
  box-shadow: 0 14px 40px rgba(0,0,0,.35);
  filter: saturate(1.1);
}
.button:active{
  transform: translateY(0);
  box-shadow: 0 8px 24px rgba(0,0,0,.28);
}
.button:focus-visible{
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  box-shadow: 0 0 0 4px rgba(128,255,234,.25);
}

.button.secondary{
  background: transparent;
  color: var(--text) !important;
  border: 1px solid rgba(255,255,255,.18);
  box-shadow: none;
}
.button.secondary:hover{
  background: var(--bg-elev);
  transform: translateY(-1px);
}

/* Make links inside cards look like buttons consistently */
.card .actions a{ text-decoration: none; }



/* --- Notice / Alert banner --- */
.alert {
  margin-top: 18px;
  padding: 14px 16px;
  border-radius: 14px;
  background: rgba(239, 68, 68, 0.12);
  border: 1px solid rgba(239, 68, 68, 0.35);
  color: #fecaca;
}
@media (prefers-color-scheme: light){
  .alert { background: rgba(239, 68, 68, 0.08); color: #7f1d1d; border-color: rgba(239, 68, 68, 0.35); }
}
.alert strong { font-weight: 800; }
.security {
  margin-top: 34px;
  background: var(--card);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
  border: 1px solid rgba(255,255,255,0.08);
}
.security h2 { margin: 0 0 10px; }
.security ul { margin: 0 0 6px 18px; padding: 0; }
.security a { color: inherit; text-decoration: underline; }