/* 正式官网的基础排版与通用控件；历史主题规则已随过程稿归档。 */
:root {
  font-family:
    -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei',
    sans-serif;
  font-synthesis: none;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}
* {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
  scroll-padding-top: 30px;
}
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  -webkit-font-smoothing: antialiased;
  font-size: 14px;
  line-height: 1.7;
  padding-bottom: 58px;
}
a {
  text-decoration: none;
  color: inherit;
}
button,
input {
  font: inherit;
}
button {
  color: inherit;
  cursor: pointer;
  background: none;
  border: 0;
}
a,
button,
summary,
input {
  -webkit-tap-highlight-color: transparent;
}
a:focus-visible,
button:focus-visible,
input:focus-visible,
summary:focus-visible,
pre:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 5px;
}
a:hover,
.text-link:hover {
  color: var(--accent);
}
button:hover {
  opacity: 0.85;
}
button:disabled {
  cursor: default;
}
h1,
h2,
h3,
p {
  margin: 0;
}
h1 {
  font-size: clamp(44px, 5.2vw, 76px);
  font-weight: 500;
  letter-spacing: -3.5px;
  line-height: 1.2;
}
h1 em {
  font-style: normal;
  color: var(--accent);
}
h2 {
  font-size: clamp(30px, 3vw, 42px);
  font-weight: 500;
  line-height: 1.4;
  letter-spacing: -1.5px;
}
h3 {
  font-size: 18px;
  font-weight: 500;
}
p {
  color: var(--muted);
}
.wrap {
  width: min(1184px, calc(100% - 96px));
  margin-inline: auto;
}
.skip-link {
  position: fixed;
  left: 20px;
  top: -100px;
  z-index: 30;
  background: var(--accent);
  color: var(--accent-ink);
  padding: 8px 16px;
}
.skip-link:focus {
  top: 12px;
}
.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 96px;
  border-bottom: 1px solid var(--line);
  gap: 24px;
}
.brand-symbol {
  font-size: 34px;
  line-height: 1;
  color: var(--accent);
  font-family: var(--mono);
}
.site-header nav {
  display: flex;
  align-items: center;
  gap: 31px;
  font-size: 13px;
}
.eyebrow {
  display: flex;
  gap: 9px;
  align-items: center;
  font-size: 10px;
  letter-spacing: 1.6px;
  font-family: var(--mono);
  margin-bottom: 22px;
}
.actions {
  display: flex;
  align-items: center;
  gap: 26px;
  margin-top: 30px;
}
.button {
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  gap: 36px;
  padding: 13px 20px;
  border-radius: 4px;
  font-size: 13px;
  font-weight: 550;
}
.primary {
  background: var(--accent);
  color: var(--accent-ink);
}
.primary:hover {
  color: var(--accent-ink);
  filter: brightness(0.95);
}
.text-link {
  font-size: 13px;
  padding: 0;
  color: var(--fg);
}
.text-link span {
  margin-left: 12px;
}
.section {
  padding-top: 100px;
}
.section-heading {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 40px;
  margin-bottom: 38px;
}
.section-intro {
  font-size: 12px;
  line-height: 1.9;
  max-width: 380px;
}
.model-controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 20px;
  margin-bottom: 24px;
}
.filters {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}
.filters button {
  padding: 8px 13px;
  color: var(--muted);
  border: 1px solid transparent;
  border-radius: 3px;
  font-size: 12px;
}
.filters button[aria-pressed='true'] {
  background: var(--accent);
  color: var(--accent-ink);
}
.filters button span {
  font-family: var(--mono);
  font-size: 9px;
  opacity: 0.65;
  margin-left: 8px;
}
.search-label {
  font-size: 0;
}
input[type='search'] {
  width: 216px;
  background: transparent;
  border: 1px solid var(--line);
  color: var(--fg);
  padding: 9px 12px;
  border-radius: 3px;
  font-size: 12px;
}
input::placeholder {
  color: var(--muted);
  opacity: 1;
}
.model-count {
  flex-basis: 100%;
  font-size: 10px;
}
.model-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}
.model-card {
  padding: 23px;
  border-bottom: 1px solid var(--line);
  border-right: 1px solid var(--line);
  min-width: 0;
  position: relative;
}
.model-card h3 {
  font-size: 17px;
  letter-spacing: -0.5px;
}
.model-card p {
  margin-top: 17px;
  font-size: 11px;
  min-height: 58px;
}
.model-tags {
  display: flex;
  gap: 5px;
  flex-wrap: wrap;
  margin-top: 22px;
}
.model-tags span {
  font-size: 9px;
  border: 1px solid var(--line);
  padding: 2px 6px;
  border-radius: 2px;
}
.model-card button {
  margin-top: 23px;
  font-size: 11px;
  color: var(--accent);
  padding: 0;
}
.fineprint {
  font-size: 10px;
  margin-top: 16px;
}
pre {
  margin: 0;
  font-family: var(--mono);
  font-size: 11px;
  line-height: 1.95;
  overflow-x: auto;
  tab-size: 2;
}
code {
  font-family: var(--mono);
}
.pricing-section {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
}
.pricing-copy > p:not(.eyebrow) {
  margin-top: 20px;
  font-size: 12px;
  line-height: 1.9;
}
.pricing-copy > button {
  margin-top: 25px;
}
.faq-section {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 50px;
}
.faq-list {
  border-top: 1px solid var(--line);
}
details {
  border-bottom: 1px solid var(--line);
}
summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  padding: 20px 0;
  font-size: 13px;
}
summary::-webkit-details-marker {
  display: none;
}
summary span {
  font-family: var(--mono);
  font-size: 18px;
  color: var(--muted);
}
details[open] summary span {
  transform: rotate(45deg);
}
details p {
  font-size: 12px;
  padding-bottom: 23px;
  max-width: 550px;
  line-height: 1.9;
}
@media (max-width: 1100px) {
  .wrap {
    width: calc(100% - 56px);
  }
  .model-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .model-card p {
    min-height: 38px;
  }
}
@media (max-width: 760px) {
  html {
    scroll-padding-top: 20px;
  }
  .wrap {
    width: calc(100% - 40px);
  }
  .site-header {
    min-height: 80px;
    flex-wrap: wrap;
    padding-block: 18px;
    gap: 17px;
  }
  .brand-symbol {
    font-size: 29px;
  }
  .site-header nav {
    width: 100%;
    justify-content: space-between;
    gap: 8px;
    font-size: 11px;
  }
  h1 {
    letter-spacing: -2px;
    font-size: 49px;
  }
  h2 {
    font-size: 30px;
  }
  .eyebrow {
    font-size: 8px;
    letter-spacing: 1.2px;
    margin-bottom: 18px;
  }
  .actions {
    margin-top: 23px;
  }
  .section {
    padding-top: 62px;
  }
  .section-heading {
    display: block;
    margin-bottom: 26px;
  }
  .section-intro {
    font-size: 11px;
    margin-top: 20px;
  }
  .model-controls {
    display: block;
    margin-bottom: 20px;
  }
  .filters {
    gap: 3px;
  }
  .filters button {
    padding: 7px 8px;
    font-size: 10px;
  }
  .filters button span {
    font-size: 8px;
    margin-left: 3px;
  }
  .search-label {
    display: block;
    margin-top: 15px;
  }
  input[type='search'] {
    width: 100%;
    font-size: 11px;
  }
  .model-count {
    margin-top: 12px;
  }
  .model-card {
    padding: 17px 13px;
  }
  .model-card h3 {
    font-size: 15px;
  }
  .model-card p {
    font-size: 10px;
    min-height: 69px;
  }
  .model-tags {
    margin-top: 15px;
  }
  .model-tags span {
    font-size: 8px;
    padding: 2px 4px;
  }
  .model-card button {
    font-size: 10px;
    margin-top: 18px;
  }
  .fineprint {
    font-size: 9px;
  }
  .pricing-section {
    grid-template-columns: 1fr;
    gap: 28px;
  }
  .pricing-copy > p:not(.eyebrow) {
    font-size: 11px;
  }
  .faq-section {
    grid-template-columns: 1fr;
    gap: 25px;
  }
  summary {
    font-size: 12px;
  }
  details p {
    font-size: 11px;
  }
}
@media (max-width: 360px) {
  .wrap {
    width: calc(100% - 32px);
  }
  h1 {
    font-size: 42px;
  }
  .filters button {
    padding-inline: 6px;
    font-size: 9px;
  }
  .model-card {
    padding: 14px 10px;
  }
  .model-card h3 {
    font-size: 14px;
  }
}
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}
[hidden] {
  display: none !important;
}

/* 八个候选的切换条在窄屏优先保留导航，演示状态可由页面内容识别。 */
/* 候选增加到十三版后，手机用原生选择器保留完整可达导航。 */