:root {
  color-scheme: light;
  --ink: #111827;
  --muted: #667085;
  --line: #e5e7eb;
  --surface: rgba(255, 255, 255, 0.92);
  --blue: #1677ff;
  --purple: #5946f2;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", sans-serif;
  line-height: 1.75;
  background:
    radial-gradient(circle at 15% 0%, rgba(71, 176, 255, 0.20), transparent 32rem),
    radial-gradient(circle at 90% 10%, rgba(105, 82, 255, 0.18), transparent 30rem),
    #f6f8fc;
}

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

.shell {
  width: min(880px, calc(100% - 32px));
  margin: 0 auto;
  padding: 36px 0 64px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 28px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--ink);
  font-size: 22px;
  font-weight: 800;
  text-decoration: none;
}

.mark {
  display: grid;
  width: 42px;
  height: 42px;
  place-items: center;
  color: white;
  border-radius: 13px;
  background: linear-gradient(145deg, var(--blue), var(--purple));
  box-shadow: 0 10px 25px rgba(65, 82, 230, 0.25);
}

nav { display: flex; gap: 18px; }
nav a { color: var(--muted); font-size: 14px; font-weight: 650; text-decoration: none; }
nav a:hover { color: var(--blue); }

.card {
  padding: clamp(24px, 5vw, 52px);
  border: 1px solid rgba(255, 255, 255, 0.9);
  border-radius: 28px;
  background: var(--surface);
  box-shadow: 0 22px 70px rgba(31, 42, 74, 0.10);
  backdrop-filter: blur(18px);
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--blue);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1 { margin: 0 0 12px; font-size: clamp(32px, 7vw, 52px); line-height: 1.16; }
h2 { margin: 34px 0 8px; font-size: 22px; line-height: 1.35; }
h3 { margin: 24px 0 4px; font-size: 17px; }
p, li { color: #344054; }
.lead { max-width: 700px; margin: 0; color: var(--muted); font-size: 17px; }
.meta { margin: 18px 0 0; color: #98a2b3; font-size: 13px; }

.grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin-top: 30px;
}

.link-card {
  padding: 22px;
  color: var(--ink);
  border: 1px solid var(--line);
  border-radius: 18px;
  background: white;
  text-decoration: none;
  transition: transform .18s ease, box-shadow .18s ease;
}

.link-card:hover { transform: translateY(-2px); box-shadow: 0 14px 32px rgba(31, 42, 74, 0.10); }
.link-card strong { display: block; margin-bottom: 4px; font-size: 18px; }
.link-card span { color: var(--muted); font-size: 14px; }

.notice {
  margin: 22px 0;
  padding: 16px 18px;
  border-left: 4px solid var(--blue);
  border-radius: 10px;
  background: #eef6ff;
  color: #29476b;
}

.english {
  margin-top: 42px;
  padding-top: 34px;
  border-top: 1px solid var(--line);
}

footer { padding: 24px 4px 0; color: #98a2b3; font-size: 13px; text-align: center; }

@media (max-width: 640px) {
  .shell { width: min(100% - 20px, 880px); padding-top: 18px; }
  .topbar { align-items: flex-start; }
  nav { flex-direction: column; align-items: flex-end; gap: 2px; }
  .grid { grid-template-columns: 1fr; }
  .card { border-radius: 22px; }
}