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

:root {
  --navy: #0a2851;
  --orange: #e85d04;
  --num-blue: #aebadd;
  --text: #3c4250;
  --muted: #5a6070;
  --line: #e6e8ee;
  --card-bg: #f5f6f9;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background: #fff;
  line-height: 1.75;
}

img {
  display: block;
  max-width: 100%;
  height: auto;
}

a {
  color: var(--navy);
  text-decoration: none;
}

a:hover {
  color: var(--orange);
}

a:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 2px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* ===== 顶部大图：电脑端固定 1280px ===== */
.hero {
  max-width: 1280px;
  margin: 0 auto;
}

.hero img {
  width: 100%;
}

/* ===== 主体容器：电脑端固定 1280px ===== */
.container {
  max-width: 1280px;
  margin: 0 auto;
}

/* ===== About 区域 ===== */
.about {
  padding-top: 56px;
  text-align: center;
}

.about h2 {
  font-size: 32px;
  color: var(--navy);
  margin-bottom: 22px;
}

.about-text {
  max-width: 980px;
  margin: 0 auto;
  font-size: 17px;
  margin-top: 16px;
}

.about-line {
  border: 0;
  border-top: 1px solid var(--line);
  margin: 40px auto;
}

.about-ask h3 {
  font-size: 26px;
  color: var(--navy);
  margin-bottom: 10px;
}

.about-ask p {
  max-width: 760px;
  margin: 0 auto;
  font-size: 16px;
  color: var(--muted);
}

.about-mobile {
  display: none;
}

/* ===== 8 个问题场景卡片 ===== */
.cards {
  display: flex;
  flex-wrap: wrap;
  column-gap: 20px;
  row-gap: 20px;
  padding: 48px 0 64px;
}

.card {
  flex: 0 0 calc(25% - 15px);
  display: flex;
  flex-direction: column;
  background: var(--card-bg);
  border: 1px solid #eef0f4;
  border-radius: 14px;
  padding: 34px 28px;
}

.card-num {
  font-size: 44px;
  font-weight: 800;
  line-height: 1;
  color: var(--num-blue);
  margin-bottom: 18px;
}

.card-title {
  font-size: 18px;
  font-weight: 700;
  line-height: 20px;
  color: var(--navy);
}

.card-accent {
  width: 44px;
  height: 4px;
  background: var(--orange);
  border-radius: 2px;
  margin: 16px 0 18px;
}

.card-desc {
  font-size: 15px;
  line-height: 20px;
  color: #4a5060;
  margin-bottom: 22px;
}

@media (min-width: 1024px) {
  .card-desc {
    min-height: 100px;
  }
}

.desc-mobile {
  display: none;
}

.card-links a {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 15px 0;
  border-top: 1px solid var(--line);
  font-size: 17px;
  font-weight: 700;
  line-height: 20px;
  color: var(--navy);
}
.card-links a:hover {
  color: var(--orange);
}

.card-links a:last-child {
  border-bottom: 1px solid var(--line);
}

.arrow {
  width: 20px;
  height: 20px;
}

/* ===== 底部：全部专题知识库 + 订阅 ===== */
.knowledge {
  display: flex;
  gap: 24px;
  padding-bottom: 72px;
}

.knowledge-left {
  flex: 1.65;
  min-width: 0;
  background: #eaf1fb;
  border-radius: 16px;
  padding: 44px 44px 34px;
}

.knowledge-title {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 30px;
  color: var(--navy);
  margin-bottom: 8px;
  font-weight: bold;
}

.knowledge-title::before {
  content: "";
  width: 6px;
  height: 30px;
  background: var(--orange);
  border-radius: 3px;
  flex: none;
}

.knowledge-sub {
  font-size: 16px;
  color: #4a5060;
  margin-bottom: 28px;
}

.knowledge-groups {
  display: flex;
  gap: 24px;
}

.group {
  flex: 1 1 0;
  min-width: 0;
  border-right: 1px solid #c1c1c1;
}

.group h3 {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 19px;
  color: var(--navy);
  margin-bottom: 12px;
  white-space: nowrap;
}

.grp-icon {
  width: 22px;
  height: 22px;
  border-radius: 6px;
}

.group ul {
  list-style: none;
}

.group li a {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 0;
  border-bottom: 1px solid #d9e2f2;
  font-size: 16px;
  font-weight: 500;
  color: #333a4a;
}

.group li a:hover {
  color: var(--orange);
}

/* 订阅模块 */
.subscribe {
  flex: 1;
  min-width: 0;
  background: #fdf6ec;
  border-radius: 16px;
  padding: 44px 36px;
  display: flex;
  flex-direction: column;
}

.subscribe h2 {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 26px;
  color: var(--navy);
  margin-bottom: 10px;
}

.sub-icon {
  width: 28px;
  height: 28px;
  border-radius: 6px;
}

.subscribe-desc {
  font-size: 15px;
  color: #4a5060;
  margin-bottom: 22px;
}

.subscribe form {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 26px;
}

.subscribe input {
  height: 52px;
  padding: 0 16px;
  border: 1px solid #d8dce6;
  border-radius: 10px;
  background: #fff;
  font-size: 15px;
  color: var(--text);
  outline: none;
}

.subscribe input:focus {
  border-color: var(--navy);
}

.subscribe button {
  height: 52px;
  border: 0;
  border-radius: 10px;
  background: #0a2851;
  color: #fff;
  font-size: 18px;
  font-weight: 700;
  cursor: pointer;
}

.subscribe button:hover {
  background: #0a2851;
}

.subscribe-note {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: auto;
  font-size: 14px;
  color: var(--muted);
}
.bannersearch {
  	display: flex;
  	flex-direction: row;
  	border: 1px solid #0a2851;
  	border-radius: 5px;
  	height: 34px;
  	width: 400px;
  	margin: 0 auto;
  	margin-top: -90px;
  	z-index: 999;
  }

  .bannersearch input {
  	padding: 15px;
  	font-size: 16px;
  	width: 361px;
  }

  .bannersearch .btn {
  	width: 39px;
  }

/* ===== 手机端 ===== */
@media (max-width: 1024px) {
  .hero,
  .container {
    padding-left: 1.25rem;
    padding-right: 1.25rem;
  }

  .about {
    padding-top: 40px;
  }

  .about h2 {
    font-size: 25px;
    margin-bottom: 16px;
  }

  .about-pc,
  .about-line,
  .about-ask {
    display: none;
  }

  .about-mobile {
    display: block;
    font-size: 18px;
    line-height: 30px;
	margin-top: 26px;
  }

  .cards {
    row-gap: 24px;
    padding: 36px 0 44px;
  }

  .card {
    flex: 0 0 100%;
    padding: 26px 20px;
  }

  .card-num {
    font-size: 32px;
    margin-bottom: 12px;
  }

  .desc-pc {
    display: none;
  }

  .desc-mobile {
    display: inline;
  }

  .knowledge {
    flex-direction: column;
    gap: 20px;
    padding-bottom: 48px;
  }

  .knowledge-left,
  .subscribe {
    padding: 28px 20px;
  }

  .knowledge-title {
    font-size: 24px;
  }

  .knowledge-title::before {
    height: 24px;
  }

  .knowledge-groups {
    flex-wrap: wrap;
    gap: 40px 16px;
  }

  .group {
    flex: 1 1 40%;
	padding-right: 5px;
  }

  .group h3 {
    font-size: 17px;
  }

  .subscribe h2 {
    font-size: 21px;
  }
	.bannersearch {
	display:flex;
	flex-direction:row;
	border: 1px solid #0a2851;
	border-radius:0.3125rem;
	height:1.625rem;
	width:9.4375rem;
	margin: 0 auto;
	margin-top:-45px;
	z-index:3;
}
	.bannersearch input {
      padding: unset;
        height: 26px;
		font-size:1rem;
		width:7.5rem;
	}
	.bannersearch .btn {
		margin-left:-0.125rem;
	}
	.bannersearch .btn img {
		height:26px;
		width:auto;
	}
	.card-title {
	  font-size: 24px;
	  font-weight: 700;
	  line-height: 20px;
	  color: var(--navy);
	}

	.card-accent {
	  width: 44px;
	  height: 4px;
	  background: var(--orange);
	  border-radius: 2px;
	  margin: 16px 0 18px;
	}

	.card-desc {
		font-size: 18px;
		line-height: 30px;
	  color: #4a5060;
	  margin-bottom: 22px;
	}
	.card-links a {
		display: flex;
		justify-content: space-between;
		align-items: center;
		padding: 15px 0;
		border-top: 1px solid var(--line);
		font-size: 20px !IMPORTANT;
		font-weight: 700;
		line-height: 20px;
		color: var(--navy);
	}
	.group:nth-child(even){
        border-right: 0px;
     }

}