:root {
  --bg: #eef1f4; --panel: #ffffff; --ink: #1b2129; --muted: #5f6a76; --line: #d9dee4;
  --accent: #00777a; --accent-ink: #ffffff; --accent-soft: #e3f2f1; --bad: #b3261e; --bad-soft: #fbeceb;
  --intro-bg: #10292c; --intro-ink: #e7f1f0; --intro-muted: #9fbab8;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #0f1215; --panel: #1a1f25; --ink: #e6e9ed; --muted: #9aa3ad; --line: #2c333b;
    --accent: #3fb6b0; --accent-ink: #0b1213; --accent-soft: #15302f; --bad: #ef6b62; --bad-soft: #3a1c1a;
    --intro-bg: #0c1f21; --intro-ink: #e2eeed; --intro-muted: #8fb0ad; }
}
* { box-sizing: border-box; }
html, body { height: 100%; }
body { margin: 0; background: var(--bg); color: var(--ink);
  font: 15px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }
.shell { min-height: 100%; display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr); }
.intro { background: var(--intro-bg); color: var(--intro-ink); padding: 64px clamp(24px, 6vw, 88px);
  display: flex; flex-direction: column; justify-content: center; gap: 4px; }
.mark { color: #5fd3cc; margin-bottom: 18px; }
.intro h1 { font-size: clamp(26px, 3vw, 34px); line-height: 1.15; margin: 0 0 12px; letter-spacing: -0.01em; font-weight: 650; }
.lead { color: var(--intro-ink); opacity: .92; max-width: 34em; margin: 0 0 26px; font-size: 16px; }
.points { list-style: none; padding: 0; margin: 0 0 36px; display: grid; gap: 12px; max-width: 34em; }
.points li { color: var(--intro-muted); padding-left: 16px; border-left: 2px solid #2f6f6c; }
.points span { display: block; color: var(--intro-ink); font-weight: 600; font-size: 14px; }
.fine { color: var(--intro-muted); font-size: 12.5px; margin: 0; max-width: 36em; }
.card { align-self: center; justify-self: center; width: min(400px, calc(100% - 32px)); background: var(--panel);
  border: 1px solid var(--line); border-radius: 12px; padding: 32px 28px 24px; margin: 32px 0;
  box-shadow: 0 10px 30px rgba(16, 24, 32, .08); }
.card h2 { margin: 0 0 4px; font-size: 22px; font-weight: 650; }
.sub { margin: 0 0 22px; color: var(--muted); font-size: 14px; }
label { display: block; font-size: 13px; font-weight: 600; margin: 14px 0 6px; }
input { width: 100%; font: inherit; color: var(--ink); background: var(--panel); border: 1px solid var(--line);
  border-radius: 8px; padding: 10px 12px; outline: none; transition: border-color .15s, box-shadow .15s; }
input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
.pw { position: relative; }
.pw input { padding-right: 92px; }
.toggle { position: absolute; right: 6px; top: 50%; transform: translateY(-50%); border: 0; background: none;
  color: var(--accent); font: inherit; font-size: 13px; padding: 6px 8px; border-radius: 6px; cursor: pointer; }
.toggle:focus-visible, .submit:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.submit { width: 100%; margin-top: 22px; background: var(--accent); color: var(--accent-ink); border: 0;
  border-radius: 8px; padding: 11px 14px; font: inherit; font-weight: 600; cursor: pointer; transition: filter .15s; }
.submit:hover { filter: brightness(1.06); }
.submit:disabled { opacity: .7; cursor: progress; }
.error { background: var(--bad-soft); color: var(--bad); border: 1px solid color-mix(in srgb, var(--bad) 30%, transparent);
  border-radius: 8px; padding: 9px 12px; font-size: 14px; margin-bottom: 4px; }
.notice { margin: 22px 0 0; padding-top: 16px; border-top: 1px solid var(--line); color: var(--muted); font-size: 12.5px; }
@media (max-width: 860px) {
  .shell { grid-template-columns: 1fr; }
  .intro { padding: 36px 20px 28px; }
  .points, .fine { display: none; }
  .lead { margin-bottom: 0; font-size: 15px; }
  .card { margin: 24px auto 40px; }
}