/* 网站科技专题：布局、组件与响应式样式 */

:root {
  --blue:#2864e8;
  --ink:#1b2b48;
  --muted:#718097;
  --line:#e5ebf4;
  --bg:#f6f8fc}
* {
  box-sizing:border-box}
html {
  scroll-behavior:smooth;
  scroll-padding-top:90px}
body {
  margin:0;
  color:var(--ink);
  background:var(--bg);
  font:15px/1.8 system-ui,-apple-system,"Microsoft YaHei",sans-serif}
a {
  color:inherit;
  text-decoration:none}
a:focus-visible,summary:focus-visible {
  outline:3px solid #8fb2ff;
  outline-offset:5px}
.wrap {
  max-width:1120px;
  margin:auto;
  padding:0 24px}
header {
  background:#ffffffed;
  border-bottom:1px solid var(--line);
  position:sticky;
  top:0;
  z-index:10;
  backdrop-filter:blur(12px)}
.top {
  min-height:76px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:20px}
.brand {
  font-size:21px;
  font-weight:800}
.brand b {
  display:inline-grid;
  place-items:center;
  width:33px;
  height:33px;
  border-radius:9px;
  background:var(--blue);
  color:white;
  margin-right:9px}
nav {
  display:flex;
  gap:27px;
  font-size:14px;
  color:#64738d}
nav a:hover {
  color:var(--blue)}
.hero {
  background:linear-gradient(115deg,#eef4ff,#f7faff 65%,#eaf4ff);
  border-bottom:1px solid var(--line);
  overflow:hidden}
.hero-inner {
  min-height:410px;
  display:grid;
  grid-template-columns:1.2fr 1fr;
  align-items:center;
  gap:50px;
  padding-top:48px;
  padding-bottom:48px}
.eyebrow {
  font-size:11px;
  color:var(--blue);
  font-weight:750;
  letter-spacing:2px}
.hero h1 {
  font-size:clamp(32px,4.5vw,49px);
  line-height:1.3;
  letter-spacing:-1px;
  margin:16px 0}
.hero h1 em {
  font-style:normal;
  color:var(--blue)}
.hero p {
  max-width:540px;
  color:var(--muted);
  font-size:15px;
  margin:0 0 27px}
.actions {
  display:flex;
  gap:12px}
.btn {
  display:inline-block;
  border-radius:7px;
  padding:11px 23px;
  background:var(--blue);
  color:white;
  font-size:14px;
  font-weight:650}
.btn.alt {
  background:white;
  border:1px solid #dae4f6;
  color:var(--ink)}
.visual {
  position:relative;
  padding:20px 0}
.section {
  padding:48px 0 0}
.section-head {
  display:flex;
  justify-content:space-between;
  align-items:end;
  margin-bottom:23px;
  gap:20px}
.section-head h2 {
  font-size:25px;
  margin:0}
.section-head p {
  margin:3px 0 0;
  color:var(--muted);
  font-size:13px}
.section-num {
  font-size:11px;
  font-weight:700;
  letter-spacing:2px;
  color:#93a3bb}
.grid {
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:17px}
.card {
  padding:25px;
  background:white;
  border:1px solid var(--line);
  border-radius:10px}
.icon {
  height:38px;
  width:38px;
  background:#edf3ff;
  color:var(--blue);
  display:grid;
  place-items:center;
  border-radius:10px;
  font-size:13px;
  font-weight:800}
.card h3 {
  font-size:17px;
  margin:15px 0 8px}
.card p {
  font-size:13px;
  color:var(--muted);
  margin:0}
.tags {
  display:flex;
  flex-wrap:wrap;
  gap:7px;
  margin-top:17px}
.tags span {
  font-size:11px;
  background:#f3f6fa;
  color:#7a89a0;
  padding:2px 8px;
  border-radius:4px}
.feature {
  display:grid;
  grid-template-columns:1fr 1.4fr;
  background:white;
  border:1px solid var(--line);
  border-radius:10px;
  overflow:hidden}
.feature-intro {
  padding:33px;
  background:#1c3d79;
  color:white}
.feature-intro h3 {
  font-size:23px;
  line-height:1.5;
  margin:10px 0}
.feature-intro p {
  font-size:13px;
  color:#b9cbea}
.feature-body {
  padding:28px 32px;
  display:grid;
  gap:17px}
.feature-body h3 {
  font-size:15px;
  margin:0 0 4px}
.feature-body p {
  font-size:13px;
  color:var(--muted);
  margin:0}
.steps {
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:16px}
.step {
  border-top:2px solid #dce6f7;
  padding:20px 5px}
.step b {
  font-size:12px;
  color:var(--blue);
  letter-spacing:1px}
.step h3 {
  font-size:16px;
  margin:10px 0 7px}
.step p {
  font-size:13px;
  color:var(--muted);
  margin:0}
.resources {
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:12px}
.resource {
  background:white;
  border:1px solid var(--line);
  border-radius:8px;
  padding:18px 20px;
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap:10px}
.resource strong {
  font-size:14px}
.resource small {
  display:block;
  font-size:11px;
  color:var(--muted)}
.resource span {
  color:#91a6c8}
.resource:hover {
  border-color:#9db9f6}
.faqs {
  background:white;
  border:1px solid var(--line);
  border-radius:10px;
  padding:0 25px}
details {
  border-bottom:1px solid var(--line);
  padding:18px 0}
details:last-child {
  border:0}
summary {
  cursor:pointer;
  font-size:14px;
  font-weight:650}
details p {
  font-size:13px;
  color:var(--muted);
  margin:12px 0 2px;
  padding-right:20px}
.callout {
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:25px;
  margin:45px 0;
  background:#eaf1ff;
  border:1px solid #dbe6fc;
  border-radius:10px;
  padding:27px 30px}
.callout h2 {
  font-size:20px;
  margin:0 0 5px}
.callout p {
  font-size:13px;
  color:var(--muted);
  margin:0}
footer {
  border-top:1px solid var(--line);
  background:white;
  padding:25px 0;
  color:#8190a6;
  font-size:12px}
.foot {
  display:flex;
  justify-content:space-between;
  gap:20px}
@media(max-width:850px) {
  .hero-inner {
  grid-template-columns:1.2fr 1fr;
  gap:25px}
.grid {
  grid-template-columns:repeat(2,1fr)}
.resources {
  grid-template-columns:repeat(2,1fr)}
nav {
  gap:16px}
.steps {
  grid-template-columns:repeat(2,1fr)}
}
@media(max-width:600px) {
  .wrap {
  padding-left:18px;
  padding-right:18px}
.top {
  padding-top:14px;
  padding-bottom:12px;
  align-items:flex-start;
  flex-direction:column;
  gap:9px}
nav {
  gap:20px;
  font-size:12px}
.hero-inner {
  grid-template-columns:1fr;
  padding-top:35px;
  gap:20px}
.hero h1 {
  font-size:36px}
.visual {
  max-width:380px;
  width:100%;
  margin:auto}
.grid {
  grid-template-columns:1fr}
.feature {
  grid-template-columns:1fr}
.section {
  padding-top:35px}
.section-head {
  align-items:start}
.section-num {
  display:none}
.feature-intro {
  padding:25px}
.feature-body {
  padding:25px}
.callout {
  align-items:flex-start;
  flex-direction:column;
  padding:25px}
.foot {
  flex-direction:column;
  gap:5px}
.resource {
  padding:15px 12px}
.btn {
  padding:10px 18px}
.hero p {
  font-size:14px}
}
@media(prefers-reduced-motion:reduce) {
  html {
  scroll-behavior:auto}
}

.friendlinks {
  margin:0 0 36px;
  padding:22px 26px;
  background:white;
  border:1px solid var(--line);
  border-radius:10px}
.friendlinks h2 {
  font-size:16px;
  margin:0 0 12px}
.friendlinks ul {
  display:flex;
  flex-wrap:wrap;
  gap:12px 26px;
  list-style:none;
  padding:0;
  margin:0}
.friendlinks a {
  font-size:14px;
  color:var(--muted)}
.friendlinks a:hover {
  color:var(--blue)}
.slideshow {
  position:relative;
  overflow:hidden;
  border-radius:15px;
  border:1px solid #d6e3f8;
  box-shadow:0 20px 45px #204a8e16;
  background:#102957;
  aspect-ratio:3/2}
.slideshow .slide {
  width:100%;
  height:100%;
  object-fit:cover;
  display:block}
.slideshow .slide[hidden] {
  display:none}
.slide-prev,.slide-next {
  position:absolute;
  top:44%;
  border:1px solid #ffffff40;
  background:#10264d90;
  color:white;
  border-radius:50%;
  width:32px;
  height:32px;
  font-size:23px;
  cursor:pointer;
  line-height:1}
.slide-prev {
  left:10px}
.slide-next {
  right:10px}
.slide-controls {
  position:absolute;
  bottom:12px;
  left:16px;
  right:16px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  color:white;
  font-size:11px}
.slide-pause {
  background:#ffffff15;
  border:1px solid #ffffff40;
  border-radius:5px;
  color:white;
  padding:3px 8px;
  cursor:pointer}
.slide-dots {
  display:flex;
  gap:9px}
.slide-dots button {
  width:10px;
  height:10px;
  border:0;
  border-radius:50%;
  padding:0;
  background:#ffffff60;
  cursor:pointer}
.slide-dots button[aria-pressed="true"] {
  background:white;
  width:24px;
  border-radius:6px}
.slideshow button:focus-visible {
  outline:3px solid #8db5ff;
  outline-offset:3px}
.visual {
  min-width:0}
@media(max-width:600px) {
  .visual {
  max-width:none}
}

.feature-eyebrow  {
   color: #a9c8ff;
   }