:root {
  --main-bg: #f6f8fb;
  --card-bg: #fff;
  --accent: #7ea1ff;
  --accent-light: #b3c7ff;
  --text-main: #3451b2;
  --text-sub: #6b7a90;
  --shadow: 0 2px 16px #b3c6e022;
  --radius: 18px;
}
body {
  background: var(--main-bg);
  color: var(--text-main);
  display: flex;
  flex-direction: column;
  font-family: "SF Pro Display", "Helvetica Neue", Helvetica, Arial,
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  letter-spacing: 0.01em;
  margin: 0;
  min-height: 100vh;
  padding: 0;
}
header {
  align-items: center;
  background: linear-gradient(90deg, #fafdff 60%, #f6f8fb 100%);
  border-bottom-left-radius: 32px;
  border-bottom-right-radius: 32px;
  box-shadow: var(--shadow);
  color: var(--text-main);
  display: flex;
  flex-direction: column;
  padding: 0;
  position: relative;
  text-align: center;
}
.navbar {
  background: none;
  border-bottom: 1px solid #e3eafd;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
  padding: 12px 0 0 0;
  width: 100%;
}
.navbar-link {
  background: none;
  border-radius: 10px 10px 0 0;
  color: var(--accent);
  font-size: 1.05em;
  font-weight: 600;
  letter-spacing: 1px;
  line-height: 1.8;
  padding: 6px 14px;
  position: relative;
  text-decoration: none;
  transition: background 0.14s, color 0.14s;
}
.navbar-link.active,
.navbar-link:hover {
  background: #e3eafd;
  box-shadow: 0 2px 8px #e3eafd;
  color: #3451b2;
}
.header-title-wrap {
  align-items: center;
  display: flex;
  flex-direction: column;
  margin-bottom: 22px;
  margin-top: 44px;
  width: 100%;
}
header h1 {
  background: linear-gradient(90deg, var(--accent), var(--accent-light));
  /* font-size: 2.1em; */
  font-size: 32px;
  font-weight: 900;
  letter-spacing: 2px;
  margin: 0;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.18;
  text-shadow: none;
}
header p {
  color: var(--accent);
  font-size: 1.08em;
  font-weight: 500;
  letter-spacing: 2px;
  margin-bottom: 0;
  margin-top: 12px;
  opacity: 0.93;
}
.framework-list {
  align-items: stretch;
  display: flex;
  flex-direction: column;
  gap: 22px;
  margin: 36px auto 0 auto;
  max-width: 520px;
  padding: 0 8px 48px 8px;
  width: 100%;
}
.item {
  background: var(--card-bg);
  border: 1px solid #e3eafd;
  border-radius: var(--radius);
  box-shadow: none;
  display: flex;
  flex-direction: column;
  max-width: 100%;
  outline: none;
  padding: 22px 18px 16px 18px;
  position: relative;
  transition: box-shadow 0.13s, background 0.13s, transform 0.13s, border 0.13s;
  width: 100%;
  z-index: 0;
}
.item:hover,
.item:focus-within {
  background: #f0f4ff;
  border-color: var(--accent-light);
  box-shadow: 0 4px 16px #b3c7ff55;
  transform: translateY(-1px) scale(1.01);
  z-index: 2;
}
.item h2 {
  color: var(--accent);
  font-size: 1.13em;
  font-weight: 700;
  letter-spacing: 1.1px;
  margin-bottom: 10px;
  margin-top: 0;
  text-align: left;
}
.item .desc {
  color: var(--text-sub);
  font-size: 0.98em;
  line-height: 1.7;
  margin-bottom: 10px;
  margin-top: -2px;
}
.item ul {
  color: var(--text-sub);
  font-size: 1em;
  line-height: 1.85;
  list-style: none;
  margin: 0;
  padding-left: 16px;
  width: 100%;
}
.item ul li {
  margin-bottom: 7px;
  padding-left: 13px;
  position: relative;
}
.item ul li::before {
  background: linear-gradient(135deg, var(--accent), var(--accent-light));
  border-radius: 50%;
  box-shadow: 0 1px 4px #b3c7ff33;
  content: "";
  height: 7px;
  left: 0;
  position: absolute;
  top: 11px;
  width: 7px;
}
.item ul li a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.13s;
}
.item ul li a:hover {
  color: #3451b2;
  text-decoration: underline;
}
@media (max-width: 700px) {
  .framework-list {
    max-width: 96vw;
    padding: 0 2vw 32px 2vw;
  }
  .item {
    box-sizing: border-box;
    max-width: 99vw;
    overflow: hidden;
    padding: 14px 4px 10px 8px;
  }
  .navbar {
    flex-wrap: wrap;
    gap: 4px;
    padding: 8px 0 0 0;
  }
  header h1 {
    /* font-size: 1.18em; */
  }
  .header-title-wrap {
    margin-bottom: 16px;
    margin-top: 32px;
  }
}
.item,
header,
.framework-list {
  animation: fadeInUp 0.7s cubic-bezier(0.23, 1.02, 0.32, 1) both;
}
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(40px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}
.item,
header {
  border-radius: var(--radius);
}