* {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
}
body {
  margin: 0;
  background: #101416;
  color: #eef0e9;
  font:
    16px/1.8 -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    "Microsoft YaHei",
    sans-serif;
}
a {
  color: inherit;
  text-decoration: none;
}
a:hover {
  color: #f7c35c;
}
button {
  font: inherit;
}
a:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 2px solid #f7c35c;
  outline-offset: 5px;
}
.wrap {
  max-width: 1280px;
  margin: auto;
  padding: 0 32px;
}
header {
  border-bottom: 1px solid #303637;
}
.top {
  min-height: 100px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 30px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 24px;
  font-weight: 700;
  line-height: 1.3;
}
.brand b {
  font-size: 44px;
  position: relative;
}
.brand b span {
  color: #f7c35c;
  font-size: 17px;
}
.brand small {
  display: block;
  font-size: 10px;
  letter-spacing: 2px;
  color: #a9b2b0;
  margin-top: 8px;
}
nav {
  display: flex;
  gap: 27px;
  font-size: 15px;
}
nav a[aria-current] {
  color: #f7c35c;
  border-bottom: 2px solid #f7c35c;
}
.menu {
  display: none;
}
.hero {
  position: relative;
  min-height: 440px;
  margin-top: 30px;
  overflow: hidden;
  background: #172226;
}
.hero > img {
  width: 100%;
  height: 100%;
  position: absolute;
  object-fit: cover;
}
.hero:after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(8, 16, 18, 0.94), rgba(8, 16, 18, 0.25));
}
.herocopy {
  position: relative;
  z-index: 1;
  padding: 42px 48px;
}
.eyebrow {
  font-size: 13px;
  color: #f7c35c;
  letter-spacing: 2px;
  font-weight: 600;
}
.hero h1 {
  font-size: 56px;
  line-height: 1.2;
  margin: 18px 0;
}
.hero p {
  color: #d9dfda;
}
.button {
  display: inline-flex;
  gap: 36px;
  align-items: center;
  background: #f7c35c;
  color: #161a18;
  padding: 10px 23px;
  font-weight: 600;
  margin-top: 10px;
}
.button:hover {
  background: #ffdc95;
  color: #161a18;
}
.image-note {
  position: absolute;
  z-index: 1;
  right: 18px;
  bottom: 12px;
  font-size: 12px;
  color: #bbc3bf;
}
.intro {
  display: grid;
  grid-template-columns: 1fr 1.7fr;
  gap: 64px;
  padding: 55px 0;
  border-bottom: 1px solid #343b3b;
}
.intro h2 {
  font-size: 30px;
  line-height: 1.6;
}
.intro p {
  color: #b7c1bf;
}
.intro .eyebrow {
  color: #f7c35c;
}
h2 {
  font-size: 26px;
  line-height: 1.5;
}
h3 {
  font-size: 24px;
  line-height: 1.4;
}
.sectiontitle {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin: 32px 0 22px;
}
.sectiontitle > a {
  font-size: 14px;
  color: #bdc5c2;
}
.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}
.card {
  position: relative;
  background: #1b2325;
  padding: 28px;
  min-height: 290px;
  border-top: 2px solid #78867f;
  transition: transform 0.2s;
}
.card:hover {
  transform: translateY(-4px);
  background: #202c2c;
}
.card:nth-child(2) {
  border-color: #b19c75;
}
.card:nth-child(3) {
  border-color: #678b98;
}
.number {
  float: right;
  color: #50605d;
  font-size: 38px;
  font-family: Georgia, serif;
  line-height: 1;
}
.tag {
  font-size: 13px;
  color: #f7c35c;
  margin-top: 24px;
}
.card p:not(.tag) {
  color: #b7c1bf;
}
.read {
  display: block;
  margin-top: 24px;
  font-size: 14px;
  color: #f7c35c;
}
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin: 56px 0;
}
.feature {
  padding: 32px;
  background: #24302e;
}
.feature h2 {
  font-size: 32px;
}
.feature p {
  color: #c0cac5;
}
.secondary {
  background: #242932;
}
.pagehead {
  padding: 52px 0 32px;
  border-bottom: 1px solid #343b3b;
  margin-bottom: 34px;
}
.pagehead h1 {
  font-size: 42px;
  line-height: 1.35;
  margin: 15px 0;
}
.pagehead > p:last-child {
  color: #b7c1bf;
  max-width: 760px;
}
.prose {
  max-width: 820px;
  margin: 35px auto 72px;
  color: #c3ccc7;
  font-size: 17px;
}
.prose h2 {
  color: #f0f1e9;
  margin-top: 36px;
}
.prose a:not(.button) {
  color: #f7c35c;
  text-decoration: underline;
  text-underline-offset: 5px;
}
.meta {
  border-bottom: 1px solid #343b3b;
  padding-bottom: 22px;
  font-size: 14px;
}
.note {
  padding: 25px 0;
  margin: 25px 0 60px;
  max-width: 900px;
  color: #b7c1bf;
}
.journal {
  margin-bottom: 70px;
}
.journal > a {
  display: block;
  padding: 28px 0;
  border-bottom: 1px solid #343b3b;
}
.journal span,
.journal b {
  color: #f7c35c;
  font-size: 14px;
}
.journal p {
  color: #b7c1bf;
}
.faqs {
  max-width: 900px;
  margin: 30px auto 80px;
}
details {
  border-bottom: 1px solid #414a46;
  padding: 22px 0;
}
summary {
  cursor: pointer;
  font-size: 19px;
}
details p {
  color: #b7c1bf;
}
footer {
  border-top: 1px solid #343b3b;
  padding: 35px 0;
  font-size: 14px;
  color: #a6b2ae;
}
footer .brand {
  color: #eef0e9;
}
.footrow {
  display: flex;
  justify-content: space-between;
  gap: 25px;
  align-items: center;
}
.footlinks {
  display: flex;
  gap: 22px;
  flex-wrap: wrap;
}
.muted {
  border-top: 1px solid #293331;
  margin-top: 25px;
  padding-top: 18px;
}
.accent {
  color: #f7c35c;
}
.skip {
  position: absolute;
  left: 20px;
  top: -100px;
  background: #f7c35c;
  color: #101416;
  padding: 8px;
  z-index: 9;
}
.skip:focus {
  top: 10px;
}
@media (max-width: 900px) {
  nav {
    gap: 14px;
  }
  .wrap {
    padding: 0 22px;
  }
  .top {
    flex-wrap: wrap;
    padding-top: 18px;
    padding-bottom: 18px;
  }
  .intro {
    gap: 24px;
  }
  .cards {
    gap: 14px;
  }
  .card {
    padding: 22px;
  }
  .brand {
    font-size: 22px;
  }
}
@media (max-width: 650px) {
  .wrap {
    padding: 0 18px;
  }
  .top {
    min-height: 85px;
  }
  .brand small {
    font-size: 10px;
  }
  .menu {
    display: block;
    background: none;
    color: #eee;
    border: 1px solid #63716a;
    padding: 4px 12px;
  }
  nav {
    width: 100%;
    flex-wrap: wrap;
    gap: 15px 23px;
  }
  body.js nav {
    display: none;
  }
  body.js nav.open {
    display: flex;
  }
  .hero {
    margin-top: 18px;
    min-height: 450px;
  }
  .herocopy {
    padding: 32px 23px;
  }
  .hero h1 {
    font-size: 44px;
  }
  .hero > img {
    object-position: 65%;
  }
  .intro,
  .cards,
  .split {
    grid-template-columns: 1fr;
  }
  .intro {
    gap: 5px;
    padding: 25px 0;
  }
  .intro h2 {
    font-size: 26px;
  }
  .cards .card {
    min-height: 230px;
  }
  .split {
    margin: 32px 0;
  }
  .feature h2 {
    font-size: 28px;
  }
  .pagehead {
    padding-top: 30px;
  }
  .pagehead h1 {
    font-size: 32px;
  }
  .footrow {
    align-items: flex-start;
    flex-direction: column;
    gap: 12px;
  }
  .footlinks {
    gap: 12px 20px;
  }
  .prose {
    font-size: 16px;
  }
  .image-note {
    font-size: 12px;
  }
  .sectiontitle h2 {
    font-size: 24px;
  }
}
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  .card {
    transition: none;
  }
}
/* 内容列 70:30；24px 栏间距从可用宽度中扣除。 */
.content-layout {
  display: grid;
  grid-template-columns: minmax(0, 7fr) minmax(0, 3fr);
  gap: 24px;
  align-items: start;
}
.primary-content {
  min-width: 0;
}
.sidebar {
  min-width: 0;
  padding-top: 42px;
}
.sidebox {
  border-top: 2px solid #f7c35c;
  background: #192123;
  padding: 24px;
  margin-bottom: 24px;
}
.sidebox h2 {
  font-size: 22px;
  margin: 12px 0 20px;
}
.sidebox a {
  display: block;
  padding: 15px 0;
  border-top: 1px solid #35403e;
  font-size: 16px;
  overflow-wrap: anywhere;
}
.sidebox strong {
  display: block;
  font-size: 16px;
}
.sidebox span {
  display: block;
  color: #b7c1bf;
  font-size: 14px;
  margin-top: 4px;
}
.sidebox p {
  color: #b7c1bf;
}
.sidebox .eyebrow {
  color: #f7c35c;
}
.compact {
  background: transparent;
  border: 1px solid #35403e;
}
.intro {
  display: block;
  padding: 32px 0;
}
.intro h2 {
  font-size: 28px;
  margin: 12px 0 20px;
}
.intro-content {
  display: flow-root;
}
.intro-content p {
  margin: 0;
  color: #c2ccc8;
}
.intro-image {
  float: right;
  width: 200px;
  height: 150px;
  object-fit: cover;
  object-position: 75% center;
  margin: 5px 0 14px 22px;
  border: 1px solid #43514b;
}
.primary-content .cards {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}
.primary-content .card:last-child:nth-child(odd) {
  grid-column: 1/-1;
}
.primary-content .split {
  gap: 16px;
}
.primary-content .feature {
  padding: 25px;
}
.primary-content .feature h2 {
  font-size: 27px;
}
.footlinks {
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
}
.copyright-refresh {
  display: block;
  font-size: 13px;
  margin-top: 4px;
}
.footrow.muted {
  align-items: flex-start;
}
@media (max-width: 800px) {
  .content-layout {
    grid-template-columns: minmax(0, 1fr);
  }
  .sidebar {
    padding-top: 0;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 18px;
  }
  .sidebox {
    margin-bottom: 0;
  }
  .sidebox:last-child {
    grid-column: 1/-1;
  }
  .sidebar {
    margin-bottom: 40px;
  }
  .primary-content .cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}
@media (max-width: 520px) {
  .sidebar,
  .primary-content .cards {
    grid-template-columns: minmax(0, 1fr);
  }
  .intro-image {
    width: 130px;
    height: 110px;
    margin-left: 16px;
  }
  .intro h2 {
    font-size: 25px;
  }
  .footlinks {
    column-gap: 18px;
    row-gap: 10px;
  }
  .primary-content .feature h2 {
    font-size: 26px;
  }
}

.carousel {
  position: relative;
  margin-top: 30px;
  background: #172226;
  overflow: hidden;
}
.carousel-stage {
  position: relative;
  min-height: 410px;
}
.carousel-slide {
  position: relative;
  min-height: 410px;
}
.carousel-slide[hidden],
.carousel-controls[hidden] {
  display: none;
}
.carousel-slide > img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.carousel-slide:after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(8, 16, 18, 0.94), rgba(8, 16, 18, 0.08));
}
.slide-copy {
  position: relative;
  z-index: 1;
  padding: 36px 48px 38px;
  max-width: 750px;
}
.slide-copy h2 {
  font-size: 46px;
  line-height: 1.3;
  margin: 15px 0;
}
.slide-copy > p:not(.eyebrow) {
  color: #d8e1dc;
  max-width: 540px;
}
.carousel-controls {
  display: flex;
  gap: 12px;
  align-items: center;
  padding: 12px 24px;
  border-top: 1px solid #36403d;
  position: relative;
  z-index: 2;
}
.carousel-controls button {
  background: transparent;
  border: 1px solid #59665e;
  color: #e5e9e5;
  min-width: 44px;
  min-height: 44px;
  cursor: pointer;
}
.carousel-controls button:hover,
.carousel-dots button[aria-pressed="true"] {
  background: #f7c35c;
  color: #101416;
  border-color: #f7c35c;
}
.carousel-dots {
  display: flex;
  gap: 8px;
}
.carousel-controls .carousel-pause {
  padding: 0 12px;
}
.carousel-count {
  color: #b8c5be;
  font-size: 14px;
}
.carousel-note {
  position: absolute;
  right: 18px;
  bottom: 24px;
  font-size: 12px;
  color: #b8c5be;
  z-index: 2;
}
.intro h1 {
  font-size: 28px;
  line-height: 1.5;
  margin: 12px 0 20px;
}
.shelf-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}
.shelf-grid article {
  padding: 24px;
  background: #1b2325;
  border-top: 2px solid #6e8c84;
}
.shelf-grid h3 {
  font-size: 22px;
}
.shelf-grid p,
.topic-list p {
  color: #bdc8c2;
}
.shelf-grid a {
  color: #f7c35c;
  font-size: 15px;
}
.viewing-shelf {
  margin: 36px 0;
}
.topic-list {
  margin-bottom: 56px;
}
.topic-list > a {
  display: block;
  border-top: 1px solid #36433d;
  padding: 22px 0;
}
.topic-list span {
  font-size: 14px;
  color: #f7c35c;
}
.topic-list h3 {
  font-size: 23px;
  margin: 10px 0;
}
.topic-list p {
  margin-bottom: 0;
}
@media (max-width: 650px) {
  .carousel {
    margin-top: 18px;
  }
  .carousel-stage,
  .carousel-slide {
    min-height: 410px;
  }
  .slide-copy {
    padding: 28px 23px 32px;
  }
  .slide-copy h2 {
    font-size: 35px;
  }
  .slide-copy > p:not(.eyebrow) {
    max-width: 300px;
  }
  .carousel-slide > img {
    object-position: 65% center;
  }
  .carousel-controls {
    gap: 8px;
    padding: 12px 12px 35px;
  }
  .carousel-note {
    bottom: 6px;
    right: 12px;
  }
  .carousel-count {
    font-size: 13px;
  }
  .carousel-dots {
    gap: 5px;
  }
  .carousel-controls button {
    min-width: 40px;
  }
  .shelf-grid {
    grid-template-columns: 1fr;
  }
  .intro h1 {
    font-size: 25px;
  }
}
@media (max-width: 370px) {
  .carousel-count {
    display: none;
  }
}

.breadcrumbs {
  display: block;
  margin: 25px 0 0;
  font-size: 14px;
  color: #b8c6c0;
}
.breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  padding: 0;
  margin: 0;
}
.breadcrumbs li:not(:last-child):after {
  content: "/";
  margin-left: 8px;
  color: #72847b;
}
.breadcrumbs [aria-current] {
  color: #efeee5;
}
.related-reading {
  border-top: 1px solid #3b4841;
  margin-top: 35px;
  padding-top: 12px;
}
.related-reading ul {
  padding-left: 22px;
}
.related-reading li {
  margin: 12px 0;
}
.slide-copy .slide-title {
  font-size: 46px;
  line-height: 1.3;
  margin: 15px 0;
  font-weight: 700;
  color: #eef0e9;
}
.prose a[data-entity] {
  text-decoration-thickness: 1px;
}
.breadcrumbs + .pagehead {
  padding-top: 24px;
}
@media (max-width: 650px) {
  body.js .breadcrumbs {
    display: block;
  }
  .slide-copy .slide-title {
    font-size: 35px;
  }
}

/* 移动设备触控与缩放；页脚导航始终可见。 */
.footer-nav {
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
  gap: 8px 20px;
  max-width: 850px;
  font-size: 14px;
}
.footer-nav a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
}
.footrow:has(.footer-nav) {
  align-items: flex-start;
}
.primary-content p,
.sidebox p {
  overflow-wrap: break-word;
}
.carousel-controls {
  flex-wrap: wrap;
}
.carousel-controls button {
  min-width: 44px;
  min-height: 44px;
}
.menu {
  min-height: 44px;
  min-width: 44px;
}
.faqs summary {
  padding: 6px 0;
}
.prose,
.primary-content,
.sidebar {
  overflow-wrap: break-word;
}
@media (max-width: 650px) {
  body.js .footer-nav {
    display: flex;
  }
  .footer-nav {
    width: 100%;
    gap: 4px 16px;
  }
  .carousel-controls {
    gap: 6px;
  }
  .carousel-dots {
    gap: 4px;
  }
  .carousel-count {
    display: none;
  }
  .intro-content p {
    line-height: 1.9;
  }
}
@media (max-width: 360px) {
  .intro-image {
    float: none;
    display: block;
    width: 100%;
    height: 150px;
    margin: 0 0 16px;
  }
  .carousel-controls {
    padding-left: 8px;
    padding-right: 8px;
  }
  .carousel-controls .carousel-pause {
    padding: 0 8px;
  }
}

.table-scroll {
  max-width: 100%;
  overflow-x: auto;
  margin: 24px 0;
}
table {
  border-collapse: collapse;
  width: 100%;
  font-size: 16px;
  line-height: 1.7;
}
caption {
  text-align: left;
  color: #edf1eb;
  font-weight: 600;
  font-size: 18px;
  margin-bottom: 12px;
}
th,
td {
  text-align: left;
  padding: 14px 16px;
  border: 1px solid #35433d;
  vertical-align: top;
}
thead {
  background: #24312c;
}
tbody th {
  font-weight: 500;
  color: #e1e8e0;
}
td {
  color: #c2ccc6;
}
table a {
  color: #f7c35c;
}
.content-updated {
  font-size: 14px;
  color: #a4b4aa;
  margin: 8px 0 16px;
}
.pagehead .content-updated {
  font-size: 14px;
}
.source-note {
  border-top: 1px solid #3b4841;
  margin-top: 30px;
  font-size: 14px;
}
.source-note h2 {
  font-size: 20px;
}
.source-note ul {
  padding-left: 20px;
}
.source-note li {
  margin: 10px 0;
}
.help-index {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 24px;
  margin: 20px 0;
}
.help-index a {
  color: #f7c35c;
  padding: 8px 0;
}
.prose section {
  scroll-margin-top: 20px;
}
.slide-copy .slide-title {
  max-width: 100%;
  font-size: 42px;
  line-height: 1.3;
}
@media (max-width: 650px) {
  body.js .help-index {
    display: flex;
  }
  .slide-copy .slide-title {
    font-size: 32px;
  }
  th,
  td {
    padding: 10px;
    font-size: 14px;
  }
  .table-scroll {
    margin: 20px 0;
  }
  .pagehead h1 {
    font-size: 29px;
  }
  .primary-content .cards {
    grid-template-columns: 1fr;
  }
  .source-note a {
    overflow-wrap: anywhere;
  }
}