:root {
  color-scheme: light;
  --page-bg: #f5f7fb;
  --panel-bg: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
  --line: #dbe3ef;
  --accent: #0f766e;
  --accent-soft: #e6fffb;
  --shadow: 0 18px 48px rgba(15, 23, 42, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", "Helvetica Neue", sans-serif;
  background:
    radial-gradient(circle at top left, rgba(15, 118, 110, 0.08), transparent 32%),
    linear-gradient(180deg, #f9fbff 0%, var(--page-bg) 100%);
  color: var(--text);
}

.page {
  max-width: 960px;
  margin: 0 auto;
  padding: 32px 20px 56px;
}

.hero,
.content,
.support-card {
  background: var(--panel-bg);
  border: 1px solid rgba(219, 227, 239, 0.9);
  border-radius: 24px;
  box-shadow: var(--shadow);
}

.hero,
.support-card {
  padding: 28px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 10px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.02em;
}

h1 {
  margin: 18px 0 10px;
  font-size: clamp(28px, 5vw, 42px);
  line-height: 1.1;
}

.subtitle,
.meta,
.hint,
.footer {
  color: var(--muted);
}

.subtitle {
  margin: 0;
  font-size: 16px;
  line-height: 1.7;
}

.meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 20px;
  margin-top: 18px;
  font-size: 14px;
}

.content {
  margin-top: 20px;
  padding: 24px 26px;
}

.hint {
  margin-top: 14px;
  font-size: 14px;
}

.markdown {
  font-size: 15px;
  line-height: 1.82;
  word-break: break-word;
}

.markdown h1,
.markdown h2,
.markdown h3,
.markdown h4 {
  margin-top: 1.8em;
  margin-bottom: 0.7em;
  font-size: inherit;
  line-height: 1.45;
}

.markdown h1 {
  font-size: 32px;
}

.markdown h2 {
  font-size: 24px;
}

.markdown h3 {
  font-size: 19px;
}

.markdown h4 {
  font-size: 16px;
}

.markdown p,
.markdown ul,
.markdown ol,
.markdown table,
.markdown blockquote {
  margin: 0 0 1em;
}

.markdown ul,
.markdown ol {
  padding-left: 1.4em;
}

.markdown li + li {
  margin-top: 0.45em;
}

.markdown table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

.markdown th,
.markdown td {
  padding: 10px 12px;
  border: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.markdown th {
  background: #f8fafc;
}

.markdown a,
.support-link {
  color: #0f5cc0;
  text-decoration: none;
}

.markdown a:hover,
.support-link:hover {
  text-decoration: underline;
}

.markdown code {
  padding: 1px 6px;
  border-radius: 6px;
  background: #f3f4f6;
  font-size: 0.92em;
}

.markdown pre {
  overflow-x: auto;
  padding: 14px;
  border-radius: 14px;
  background: #111827;
  color: #f9fafb;
}

.markdown blockquote {
  padding: 12px 16px;
  border-left: 4px solid #9ca3af;
  background: #f8fafc;
  color: #475569;
}

.support-grid {
  display: grid;
  gap: 16px;
  margin-top: 20px;
}

.support-card h2 {
  margin: 14px 0 10px;
  font-size: 22px;
}

.support-card p {
  margin: 0;
  line-height: 1.7;
}

.support-list {
  display: grid;
  gap: 12px;
  margin-top: 18px;
}

.support-item {
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: #fbfdff;
}

.support-label {
  display: block;
  margin-bottom: 6px;
  font-size: 13px;
  color: var(--muted);
}

.footer {
  margin-top: 16px;
  font-size: 13px;
}

.loading,
.error {
  padding: 16px 18px;
  border-radius: 16px;
  font-size: 14px;
}

.loading {
  background: #f8fafc;
  color: var(--muted);
}

.error {
  background: #fff1f2;
  color: #b91c1c;
}

@media (max-width: 640px) {
  .page {
    padding: 20px 14px 36px;
  }

  .hero,
  .content,
  .support-card {
    padding: 20px;
    border-radius: 18px;
  }

  .content {
    padding: 18px;
  }
}