:root {
  --brand: #2f54eb;
  --brand-dark: #1d39c4;
  --brand-light: #4096ff;
  --accent: #12b8a6;
  --ink: #1f2329;
  --ink-soft: #5a6472;
  --line: #e6e8ee;
  --bg: #f7f8fb;
  --card: #ffffff;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Segoe UI", system-ui, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a { color: inherit; text-decoration: none; }


.nav {
  position: sticky; top: 0; z-index: 10;
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 32px;
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: center; gap: 12px; }
.brand .mark {
  width: 34px; height: 34px; border-radius: 10px;
  background: linear-gradient(135deg, var(--brand-dark), var(--brand-light));
  color: #fff; font-weight: 800; font-size: 18px;
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 4px 12px rgba(47, 84, 235, .35);
}
.brand .txt { display: flex; align-items: baseline; gap: 10px; }
.brand .cn { font-size: 20px; font-weight: 700; color: var(--brand-dark); letter-spacing: 1px; }
.brand .en { font-size: 12px; letter-spacing: 2px; color: var(--ink-soft); font-weight: 600; }
.nav-links { display: flex; gap: 28px; font-size: 15px; color: var(--ink-soft); }
.nav-links a { transition: color .15s; }
.nav-links a:hover { color: var(--brand); }


.hero {
  position: relative;
  padding: 60px 24px 52px;
  text-align: center;
  background:
    radial-gradient(1100px 460px at 50% -8%, #eaf0ff 0%, rgba(234,240,255,0) 60%),
    linear-gradient(180deg, #ffffff 0%, var(--bg) 100%);
  overflow: hidden;
}
.blob {
  position: absolute; border-radius: 50%;
  filter: blur(70px); opacity: .5; z-index: 0;
  animation: float 9s ease-in-out infinite;
}
.blob.b1 { width: 340px; height: 340px; left: -80px; top: -40px; background: #dbe4ff; }
.blob.b2 { width: 300px; height: 300px; right: -70px; bottom: -60px; background: #d3f5f0; animation-delay: -3s; }
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-26px); }
}
.hero .inner { position: relative; z-index: 1; }
.hero .tag {
  display: inline-block; padding: 6px 16px; border-radius: 999px;
  background: #eef2ff; color: var(--brand-dark);
  font-size: 13px; font-weight: 600; letter-spacing: 1px; margin-bottom: 16px;
}
.hero .slogan {
  font-size: clamp(38px, 6vw, 60px);
  font-weight: 800;
  letter-spacing: 3px;
  background: linear-gradient(90deg, var(--brand-dark), #3b82f6, var(--accent));
  background-size: 200% auto;
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: shine 5s linear infinite;
}
@keyframes shine { to { background-position: 200% center; } }



.section { width: 100%; max-width: 1120px; margin: 0 auto; padding: 36px 24px 0; }

.grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 22px;
  justify-items: center;
}
.card {
  position: relative;
  display: flex;
  flex-direction: column;
  width: 100%;
  max-width: 300px;
  min-height: 340px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 26px 24px;
  transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
}
.card::before {
  content: ""; position: absolute; inset: 0 0 auto 0; height: 4px;
  background: linear-gradient(90deg, var(--brand), var(--accent));
  border-radius: 18px 18px 0 0; opacity: 0; transition: opacity .2s;
}

a.card:hover {
  transform: translateY(-6px);
  box-shadow: 0 18px 44px rgba(47, 84, 235, .14);
  border-color: #c9d6ff;
}
a.card:hover::before { opacity: 1; }
.card .icon {
  width: 52px; height: 52px; border-radius: 14px;
  display: flex; align-items: center; justify-content: center;
  background: #eef2ff; color: var(--brand); margin-bottom: 18px;
  flex: none;
}
.card .icon svg { width: 26px; height: 26px; }
.card h3 { font-size: 19px; margin-bottom: 10px; }
.card p { color: var(--ink-soft); font-size: 14px; line-height: 1.75; margin-bottom: 16px; }
.card .tags { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 16px; margin-top: auto; }
.card .tag {
  font-size: 12px; color: var(--ink-soft);
  background: #f3f5f9; padding: 4px 10px; border-radius: 6px;
}
.card .enter { color: var(--brand); font-weight: 600; font-size: 14px; }
.card .enter::after { content: " →"; }
a.card:hover .enter { color: var(--brand-dark); }


div.card .enter { color: var(--ink-soft); }
div.card .enter::after { content: ""; }


.card.placeholder {
  background: #fbfcfe;
  border-style: dashed;
  border-color: #d5dce8;
}
.card.placeholder .icon { background: #f1f3f7; color: #9aa3b2; }
.card.placeholder h3 { color: var(--ink-soft); }
.card.placeholder .enter { color: #9aa3b2; }
.card.placeholder .enter::after { content: ""; }


.about {
  width: 100%; max-width: 1120px; margin: 64px auto 0; padding: 0 24px 72px;
  display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: center;
}
.about .name { font-size: 24px; font-weight: 800; margin-bottom: 6px; }
.about .name-en { font-size: 13px; letter-spacing: 3px; color: var(--ink-soft); margin-bottom: 18px; }
.about .desc { color: var(--ink-soft); font-size: 15px; }
.contact {
  background: var(--card); border: 1px solid var(--line); border-radius: 16px;
  padding: 28px;
}
.contact h4 { margin-bottom: 16px; font-size: 18px; }
.contact .row { display: flex; gap: 10px; padding: 8px 0; color: var(--ink-soft); font-size: 15px; }
.contact .row .k { color: var(--ink); font-weight: 600; min-width: 64px; }
.contact .coop-tip { margin: 18px 0 0; padding: 12px 14px; font-size: 14px; line-height: 1.7; color: var(--ink-soft); background: #f5f8ff; border: 1px solid var(--line); border-radius: 10px; }
.contact .coop-tip a { color: var(--brand, #2b6cff); font-weight: 600; text-decoration: none; }
.contact .coop-tip a:hover { text-decoration: underline; }


.page { flex: 1; width: 100%; max-width: 960px; margin: 0 auto; padding: 56px 24px 80px; }
.page-title { font-size: 30px; font-weight: 800; }
.page-note { color: var(--ink-soft); font-size: 15px; margin: 10px 0 28px; }


.download-group { margin-top: 8px; }
.download-group + .download-group { margin-top: 40px; }
.download-group-title { font-size: 20px; font-weight: 700; margin-bottom: 16px; }
.download-item {
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  background: var(--card); border: 1px solid var(--line); border-radius: 14px;
  padding: 20px 24px; margin-bottom: 14px;
  transition: border-color .15s, box-shadow .15s;
}
.download-item:hover { border-color: #c9d6ff; box-shadow: 0 10px 24px rgba(47, 84, 235, .1); }
.download-name { font-size: 16px; font-weight: 600; }
.download-meta { font-size: 13px; color: var(--ink-soft); margin-top: 4px; }
.download-btn {
  display: inline-block; padding: 10px 24px; border-radius: 9px;
  background: linear-gradient(135deg, var(--brand-dark), var(--brand-light));
  color: #fff; font-weight: 600; font-size: 14px; white-space: nowrap;
  box-shadow: 0 6px 16px rgba(47, 84, 235, .28);
  transition: transform .15s, box-shadow .15s;
}
.download-btn:hover { transform: translateY(-2px); box-shadow: 0 10px 20px rgba(47, 84, 235, .32); }


footer {
  margin-top: auto;
  border-top: 1px solid var(--line);
  padding: 28px 24px;
  text-align: center;
  color: var(--ink-soft);
  font-size: 14px;
  background: #fff;
}
footer .line2 { margin-top: 6px; font-size: 13px; color: #9aa3b2; }

footer .line2 a { color: inherit; text-decoration: none; }
footer .line2 a:hover { color: var(--brand); text-decoration: underline; }


@media (max-width: 1000px) {
  .grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}
@media (max-width: 760px) {
  .grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 720px) {
  .about { grid-template-columns: 1fr; }
  .nav { padding: 12px 20px; }
  .nav-links { gap: 16px; font-size: 14px; }
}
@media (max-width: 520px) {
  .grid { grid-template-columns: 1fr; }
}