:root {
  --bg0: #0f1c24;
  --bg1: #16303c;
  --card: #f7fafb;
  --ink: #14212a;
  --muted: #5b6b75;
  --accent: #0d7a6f;
  --accent-2: #c45c26;
  --line: #d5e0e6;
  --ok: #1b7f4a;
  --bad: #b42318;
  --radius: 14px;
  --font: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font);
  color: var(--ink);
  background:
    radial-gradient(1200px 600px at 10% -10%, #2a6b62 0%, transparent 55%),
    radial-gradient(900px 500px at 100% 0%, #8a4b2a 0%, transparent 50%),
    linear-gradient(160deg, var(--bg0), var(--bg1));
}

.shell {
  width: min(720px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 2.5rem 0 3rem;
}

.hero .brand {
  margin: 0;
  font-size: 0.85rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: #d7efe9;
}
.hero h1 {
  margin: 0.35rem 0 0.4rem;
  font-size: clamp(1.6rem, 4vw, 2.1rem);
  color: #fff;
  font-weight: 650;
}
.hero .sub {
  margin: 0;
  color: #c5d7de;
  line-height: 1.5;
}

.steps {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  padding: 1.25rem 0 1rem;
  margin: 0;
}
.steps li {
  font-size: 0.78rem;
  padding: 0.35rem 0.65rem;
  border-radius: 999px;
  color: #9eb0b9;
  background: rgba(255,255,255,0.06);
  border: 1px solid transparent;
}
.steps li.active {
  color: #e8fffa;
  border-color: rgba(13, 122, 111, 0.55);
  background: rgba(13, 122, 111, 0.35);
}
.steps li.done { color: #b7e0d4; }

.card {
  background: var(--card);
  border-radius: var(--radius);
  padding: 1.35rem 1.4rem 1.5rem;
  box-shadow: 0 18px 40px rgba(0,0,0,0.22);
}

h2 { margin: 0 0 0.75rem; font-size: 1.15rem; }
p.hint { margin: 0 0 1rem; color: var(--muted); font-size: 0.92rem; line-height: 1.5; }

label {
  display: block;
  font-size: 0.86rem;
  margin: 0.75rem 0 0.3rem;
  font-weight: 600;
}
input {
  width: 100%;
  padding: 0.6rem 0.7rem;
  border: 1px solid var(--line);
  border-radius: 10px;
  font: inherit;
  background: #fff;
}
input:focus {
  outline: 2px solid rgba(13, 122, 111, 0.35);
  border-color: var(--accent);
}

.row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}
@media (max-width: 560px) {
  .row { grid-template-columns: 1fr; }
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin-top: 1.25rem;
}
button {
  font: inherit;
  border: 0;
  border-radius: 10px;
  padding: 0.55rem 1rem;
  cursor: pointer;
}
button.primary {
  background: var(--accent);
  color: #fff;
}
button.ghost {
  background: #e8eef1;
  color: var(--ink);
}
button:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.msg {
  margin-top: 0.85rem;
  padding: 0.65rem 0.75rem;
  border-radius: 10px;
  font-size: 0.9rem;
  line-height: 1.45;
  display: none;
}
.msg.show { display: block; }
.msg.ok { background: #e6f6ec; color: var(--ok); }
.msg.bad { background: #fdecea; color: var(--bad); }
.msg.info { background: #eef4f7; color: var(--muted); }

ul.check {
  margin: 0;
  padding: 0;
  list-style: none;
}
ul.check li {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.55rem 0;
  border-bottom: 1px solid var(--line);
  font-size: 0.92rem;
}
ul.check li:last-child { border-bottom: 0; }
.tag-ok { color: var(--ok); font-weight: 600; }
.tag-bad { color: var(--bad); font-weight: 600; }

.foot {
  color: #9eb0b9;
  font-size: 0.8rem;
  text-align: center;
  margin-top: 1rem;
}

code {
  font-size: 0.85em;
  background: #eef3f6;
  padding: 0.1rem 0.3rem;
  border-radius: 4px;
}