:root {
  --bg: #f4f5fb;
  --card: #ffffff;
  --text: #10152e;
  --muted: #5d6585;
  --border: #dfe2ef;
  --primary: #3d4fd6;
  --primary-hover: #2f40bd;
  --primary-soft: rgba(61, 79, 214, 0.1);
  --danger: #c62828;
  --danger-soft: #fdecec;
  --warn-soft: #fff6db;
  --warn-border: #f2d27a;
  --ok: #16a34a;
  --radius: 14px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0c1126;
    --card: #141a36;
    --text: #e9ecfb;
    --muted: #a1a8c9;
    --border: #283056;
    --primary: #6f7ff0;
    --primary-hover: #8794f4;
    --primary-soft: rgba(111, 127, 240, 0.16);
    --danger: #ff8a80;
    --danger-soft: rgba(255, 138, 128, 0.12);
    --warn-soft: rgba(242, 210, 122, 0.12);
    --warn-border: #8a7330;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Segoe UI", system-ui, -apple-system, Roboto, sans-serif;
  font-size: 16px;
  line-height: 1.5;
}

.wrap {
  max-width: 560px;
  margin: 0 auto;
  padding: 24px 16px 40px;
}

.head { text-align: center; margin-bottom: 18px; }
.logo { height: 48px; width: auto; }
h1 { font-size: 1.6rem; margin: 12px 0 4px; }
h2 { font-size: 1.15rem; margin: 0 0 12px; }
.sub { color: var(--muted); margin: 0; }

.steps {
  display: flex;
  gap: 8px;
  list-style: none;
  padding: 0;
  margin: 0 0 14px;
}
.steps li {
  flex: 1;
  text-align: center;
  font-size: 0.85rem;
  color: var(--muted);
  padding-top: 8px;
  border-top: 4px solid var(--border);
}
.steps li.active, .steps li.past { color: var(--primary); border-color: var(--primary); font-weight: 600; }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: 0 6px 20px rgba(16, 21, 46, 0.06);
}

label { display: block; font-weight: 600; font-size: 0.92rem; margin: 12px 0 6px; }

input, select {
  width: 100%;
  padding: 12px 14px;
  font: inherit;
  color: var(--text);
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
}
input:focus, select:focus { outline: 3px solid var(--primary-soft); border-color: var(--primary); }
select:disabled { opacity: 0.6; }

.grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0 12px; }
@media (max-width: 420px) { .grid { grid-template-columns: 1fr; } }

.row { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 16px; }

.btn {
  display: inline-block;
  margin-top: 16px;
  padding: 12px 20px;
  font: inherit;
  font-weight: 700;
  color: #fff;
  background: var(--primary);
  border: 0;
  border-radius: 10px;
  cursor: pointer;
}
.row .btn { margin-top: 0; }
.btn:hover { background: var(--primary-hover); }
.btn:disabled { opacity: 0.6; cursor: wait; }
.btn-ghost { color: var(--primary); background: transparent; border: 1px solid var(--border); }
.btn-ghost:hover { background: var(--primary-soft); }

.link {
  margin-top: 14px;
  padding: 0;
  font: inherit;
  font-size: 0.9rem;
  color: var(--primary);
  background: none;
  border: 0;
  text-decoration: underline;
  cursor: pointer;
}

.hint { color: var(--muted); font-size: 0.88rem; margin: 8px 0 0; }

.banner { border-radius: 10px; padding: 12px 14px; margin-bottom: 14px; font-size: 0.93rem; }
.banner-error { background: var(--danger-soft); color: var(--danger); border: 1px solid var(--danger); }
.banner-warn { background: var(--warn-soft); border: 1px solid var(--warn-border); }
.banner-info { background: var(--primary-soft); border: 1px solid var(--primary); }

.test-code {
  margin: 10px 0 0;
  padding: 8px 12px;
  border: 1px dashed var(--warn-border);
  border-radius: 8px;
  background: var(--warn-soft);
  font-size: 0.92rem;
}

.check { display: flex; gap: 10px; align-items: flex-start; font-weight: 400; margin-top: 18px; }
.check input { width: auto; margin-top: 4px; }

.done { text-align: center; }
.done-icon {
  width: 56px; height: 56px; line-height: 56px;
  margin: 0 auto 10px;
  border-radius: 50%;
  background: var(--ok); color: #fff;
  font-size: 1.8rem; font-weight: 700;
}

.foot { text-align: center; color: var(--muted); font-size: 0.85rem; margin-top: 22px; display: flex; gap: 8px; justify-content: center; }
a { color: var(--primary); }