:root {
  --bg: #f4f7fb;
  --ink: #182230;
  --muted: #5b6b7f;
  --card: #ffffff;
  --line: #d8e2ef;
  --accent: #0f766e;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background: radial-gradient(circle at top left, #dcefea, var(--bg) 45%) fixed;
}

.shell {
  max-width: 1280px;
  margin: 0 auto;
  padding: 20px 24px 28px;
  display: grid;
  gap: 16px;
}

.hero h1 {
  margin: 6px 0 8px;
  font-size: 34px;
}

.hero p {
  margin: 0;
  color: var(--muted);
}

.kicker {
  color: var(--accent);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 1.1px;
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 16px;
}

.split {
  display: grid;
  gap: 16px;
  grid-template-columns: 1fr 1fr;
}

.actions {
  margin-top: 10px;
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.btn,
button {
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink);
  border-radius: 8px;
  padding: 8px 12px;
  text-decoration: none;
  cursor: pointer;
}

.btn:hover,
button:hover {
  border-color: var(--accent);
}

.grid {
  margin-top: 10px;
  display: grid;
  gap: 10px;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.grid.two {
  grid-template-columns: 1fr 1fr;
}

.app {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 10px;
}

.app h3 {
  margin: 0 0 6px;
}

.meta {
  color: var(--muted);
  font-size: 13px;
}

.msg {
  margin: 8px 0 0;
  color: #1d4f6c;
  font-size: 13px;
}

.muted {
  color: var(--muted);
  margin: 0;
}

ul {
  margin: 8px 0 0 18px;
  color: var(--muted);
}

label {
  display: grid;
  gap: 6px;
  color: var(--muted);
  font-size: 13px;
}

input,
select {
  width: 100%;
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.tag-box {
  margin-top: 10px;
  border: 1px dashed var(--line);
  border-radius: 10px;
  padding: 10px;
  display: grid;
  gap: 8px;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  align-items: center;
}

.tag-title {
  grid-column: 1 / -1;
  font-size: 13px;
  color: var(--muted);
}

.tag-pill {
  display: inline-block;
  border: 1px solid #b9d8d4;
  color: #0f766e;
  border-radius: 999px;
  padding: 2px 8px;
  font-size: 12px;
  margin-right: 6px;
  margin-top: 4px;
}

.sdk-grid {
  display: grid;
  gap: 10px;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.sdk-grid article {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 10px;
}

.sdk-grid h3 {
  margin: 0 0 6px;
  font-size: 15px;
}

.sdk-grid p {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
}

.hidden {
  display: none;
}

@media (max-width: 900px) {
  .split {
    grid-template-columns: 1fr;
  }
  .grid.two {
    grid-template-columns: 1fr;
  }
}