:root {
  color-scheme: light;
  --ink: #1c2430;
  --muted: #4d5b66;
  --paper: #f3f7f4;
  --card: rgba(255, 253, 248, 0.92);
  --line: rgba(20, 90, 110, 0.14);
  --accent: #0e8f86;
  --accent-ink: #f7fffc;
  --bad: #8d2b2b;
  --teal: #14c4a8;
  --blue: #2f6fe4;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  color: var(--ink);
  font-family: "PingFang SC", "Noto Sans SC", "Microsoft YaHei", "Segoe UI", sans-serif;
  line-height: 1.55;
  background: var(--paper);
}

main {
  max-width: 42rem;
  margin: 0 auto;
  padding: 1.25rem 1rem 3.5rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  margin: 0 0 1rem;
  color: var(--ink);
  font-weight: 700;
  text-decoration: none;
}

.brand img {
  width: 44px;
  height: 44px;
  border-radius: 8px;
  box-shadow: 0 8px 18px rgba(20, 90, 120, 0.16);
}

.hero {
  display: grid;
  gap: 1rem;
}

.hero-logo,
.home-logo {
  width: min(100%, 34rem);
  height: auto;
  margin: 0 auto;
  border-radius: 8px;
  box-shadow: 0 8px 18px rgba(20, 90, 110, 0.12);
  display: block;
}

.home {
  max-width: 28rem;
  margin: 0 auto;
  padding-top: 1.5rem;
  text-align: center;
}

.home-logo {
  width: 7.5rem;
  height: auto;
}

.home h1 { font-size: 1.8rem; }

.home .lead { margin-top: 0.2rem; }

.options {
  margin: 1rem 0 0;
  padding: 0;
  list-style: none;
  text-align: center;
  font-size: 0.92rem;
}

.options li { margin: 0.35rem 0; }

.sheet {
  margin-top: 1.2rem;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0.3rem 1rem 0.4rem;
  box-shadow: none;
}

.eyebrow {
  margin: 0 0 0.4rem;
  color: var(--accent);
  font-size: 0.85rem;
  letter-spacing: 0.04em;
}

h1 {
  margin: 0 0 0.6rem;
  font-size: 2rem;
  line-height: 1.2;
}

h2 { font-size: 1.2rem; }

.lead, .hint, .status {
  color: var(--muted);
}

a, code { overflow-wrap: anywhere; }

a { color: var(--accent); }

.button, button {
  display: inline-block;
  margin-top: 0.4rem;
  background: var(--accent);
  color: var(--accent-ink);
  text-decoration: none;
  border: 0;
  border-radius: 8px;
  padding: 0.9rem 1.2rem;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}

.downloads {
  display: grid;
  gap: 0.7rem;
  margin: 1.1rem 0 0.2rem;
}

.downloads .button {
  margin-top: 0;
  text-align: center;
  font-weight: 700;
}

.downloads a.secondary,
button.ghost {
  background: #fff;
  color: var(--accent);
  border: 1px solid rgba(14, 143, 134, 0.35);
}

[hidden] { display: none !important; }

form {
  display: grid;
  gap: 0.85rem;
  margin-top: 1.4rem;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 1rem;
}

label {
  display: grid;
  gap: 0.3rem;
  font-size: 0.95rem;
}

.check {
  display: flex;
  gap: 0.5rem;
  align-items: center;
}

input[type="text"], input[type="password"], input:not([type="checkbox"]) {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0.65rem 0.75rem;
  font: inherit;
  background: #fff;
}

.hint { margin: -0.3rem 0 0; font-size: 0.85rem; }

.status.bad { color: var(--bad); }

.warn {
  background: #fff4f4;
  color: var(--bad);
  border: 1px solid #e7c4c4;
  border-radius: 8px;
  padding: 0.75rem 0.9rem;
}

.done {
  margin: 0 0 1.2rem;
  background: #f3fbf7;
  border: 2px solid var(--accent);
  border-radius: 8px;
  padding: 1rem 1.1rem;
}

.done h2 { margin-top: 0; }
.notice {
  white-space: pre-wrap;
  margin-top: 1.25rem;
  padding: 0.9rem 1rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  line-height: 1.55;
}

textarea, .copy {
  width: 100%;
  min-height: 14rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0.75rem;
  font: 0.92rem/1.45 ui-monospace, "SFMono-Regular", Consolas, monospace;
  background: #fff;
  color: var(--ink);
  resize: vertical;
}

.actions {
  display: grid;
  gap: 0.55rem;
  margin-top: 0.8rem;
}

button.ghost {
  background: transparent;
  color: var(--accent);
  border: 1px solid var(--accent);
  box-shadow: none;
}

ul.tree { padding-left: 1.15rem; }

details { margin-top: 1rem; }

button:disabled { opacity: 0.55; cursor: wait; }

@media (max-width: 640px) {
  h1 { font-size: 1.7rem; }
  .button, button { display: block; text-align: center; }
}

@media (min-width: 880px) {
  main {
    max-width: 68rem;
    padding: 2rem 1.5rem 4rem;
  }
  .hero {
    grid-template-columns: minmax(0, 1.05fr) minmax(18rem, 0.95fr);
    gap: 2rem;
    align-items: center;
  }
  .hero-logo { margin: 0; width: 100%; }
  .sheet { padding: 0.4rem 1.4rem 0.6rem; }
}