:root {
  color-scheme: dark;
  --ink: #f5f8fb;
  --muted: #9fb0c1;
  --panel: rgba(13, 25, 37, .92);
  --line: rgba(148, 176, 199, .25);
  --accent: #4ee1b3;
  --accent-ink: #04241c;
  --danger: #ff8d8d;
}
* { box-sizing: border-box; }
html, body { min-height: 100%; margin: 0; }
body {
  background:
    radial-gradient(circle at 12% 18%, rgba(42, 168, 137, .22), transparent 34rem),
    linear-gradient(135deg, #071018, #0b1b29 58%, #071018);
  color: var(--ink);
  font: 16px/1.55 Inter, ui-sans-serif, system-ui, sans-serif;
}
.auth-shell {
  width: min(1120px, calc(100% - 32px));
  min-height: 100vh;
  margin: auto;
  display: grid;
  grid-template-columns: 1.2fr .8fr;
  align-items: center;
  gap: clamp(36px, 7vw, 96px);
  padding: 48px 0;
}
.eyebrow { color: var(--accent); letter-spacing: .14em; font-size: .78rem; font-weight: 800; }
h1 { max-width: 680px; margin: 12px 0 18px; font-size: clamp(2.3rem, 5vw, 4.8rem); line-height: 1.02; }
.brand-panel > p:not(.eyebrow), .brand-panel li, .auth-card p { color: var(--muted); }
.brand-panel ul { display: grid; gap: 10px; padding-left: 22px; }
.auth-card {
  border: 1px solid var(--line);
  border-radius: 22px;
  padding: clamp(24px, 4vw, 38px);
  background: var(--panel);
  box-shadow: 0 28px 90px rgba(0, 0, 0, .38);
  backdrop-filter: blur(16px);
}
.tabs { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin-bottom: 28px; }
.tabs button {
  border: 1px solid var(--line); border-radius: 999px; padding: 11px;
  background: transparent; color: var(--muted); cursor: pointer;
}
.tabs button.active { background: rgba(78, 225, 179, .13); border-color: var(--accent); color: var(--ink); }
h2 { margin: 0 0 8px; font-size: 1.55rem; }
form { display: grid; gap: 17px; }
label { display: grid; gap: 7px; font-size: .9rem; font-weight: 700; }
input {
  width: 100%; border: 1px solid var(--line); border-radius: 12px;
  background: #08131d; color: var(--ink); padding: 13px 14px; font: inherit;
}
input:focus { outline: 3px solid rgba(78, 225, 179, .2); border-color: var(--accent); }
.primary {
  border: 0; border-radius: 12px; padding: 14px 18px;
  background: var(--accent); color: var(--accent-ink); font-weight: 900; cursor: pointer;
}
.status { min-height: 1.5em; margin: 0; }
.status.error { color: var(--danger); }
[hidden] { display: none !important; }
@media (max-width: 780px) {
  .auth-shell { grid-template-columns: 1fr; padding: 28px 0; }
  .brand-panel h1 { font-size: clamp(2.1rem, 11vw, 3.3rem); }
}