/*
 * [INPUT]: 共享页头、html 语言属性与八种语言的文案长度。
 * [OUTPUT]: 原生八语言菜单、多文字系统排版与手机布局。
 * [POS]: 在共享响应式规则之后加载，语言差异只调整排版，不复制页面或业务组件。
 * [PROTOCOL]: 变更时更新此头部，然后检查 CLAUDE.md
 */
.header-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}
.language-control {
  position: relative;
  flex: 0 0 auto;
  color: #c3ceb9;
}
.language-control summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 9px;
  min-width: 88px;
  padding: 10px;
  border: 1px solid #43503a;
  border-radius: 5px;
  background: #11170e;
  font-size: 13px;
  cursor: pointer;
  list-style: none;
}
.language-control summary::-webkit-details-marker { display: none; }
.language-control summary:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
}
.language-options {
  position: absolute;
  z-index: 50;
  top: calc(100% + 8px);
  right: 0;
  width: 200px;
  max-width: calc(100vw - 32px);
  max-height: 65vh;
  overflow-y: auto;
  padding: 7px;
  border: 1px solid #43503a;
  border-radius: 7px;
  background: #11170e;
  box-shadow: 0 16px 40px #0008;
}
.language-control a {
  display: block;
  padding: 10px 12px;
  font-size: 14px;
  border-radius: 3px;
}
.language-control a[aria-current] {
  color: var(--accent);
  background: #25321b;
}
.language-control a:hover { color: var(--accent); background: #1e2918; }
html:not(:lang(zh-CN)) h1,
html:not(:lang(zh-CN)) h2 {
  letter-spacing: -0.035em;
}
html:lang(zh-CN) .hero h1 {
  font-size: clamp(38px, 4.8vw, 68px);
  letter-spacing: -0.035em;
  line-height: 1.25;
}
html:not(:lang(zh-CN)) .hero h1 {
  font: 500 clamp(48px, 5.1vw, 76px) / 1.12 var(--display);
  letter-spacing: -0.055em;
}
html:not(:lang(zh-CN)) .hero-en {
  display: none;
}
html:not(:lang(zh-CN)) .hero-description {
  margin-top: 29px;
  max-width: 470px;
}
html:not(:lang(zh-CN)) .hero-actions {
  flex-wrap: wrap;
}
html:not(:lang(zh-CN)) .section-heading {
  align-items: flex-start;
}
html:not(:lang(zh-CN)) .section-heading h2 {
  max-width: 660px;
}
html:not(:lang(zh-CN)) .section-heading .section-description {
  min-width: 240px;
  max-width: 330px;
  padding-top: 45px;
}
html:not(:lang(zh-CN)) .demo-engine {
  min-width: 0;
}
html:not(:lang(zh-CN)) .process-steps {
  font-size: 11px;
  text-align: center;
}
html:not(:lang(zh-CN)) .panel-label {
  flex-wrap: wrap;
  row-gap: 5px;
}
html:not(:lang(zh-CN)) .use-card h3 {
  min-height: 52px;
}
html:not(:lang(zh-CN)) .closing h2 {
  max-width: 850px;
  margin-inline: auto;
}
html:not(:lang(zh-CN)) .compare-intro h1 {
  max-width: 690px;
  font-family: var(--display);
}
html:not(:lang(zh-CN)) .compare-lead {
  max-width: 315px;
  font-size: 1rem;
}
html:not(:lang(zh-CN)) .path-stages li {
  overflow-wrap: anywhere;
}
html:not(:lang(zh-CN)) .fit-grid h3 {
  line-height: 1.4;
}
@media (max-width: 1100px) {
  .site-header nav {
    gap: 23px;
  }
  .header-actions {
    gap: 9px;
  }
  .header-cta {
    gap: 15px;
    padding-inline: 14px;
  }
  html:not(:lang(zh-CN)) .site-header nav {
    gap: 17px;
    font-size: 13px;
  }
  html:not(:lang(zh-CN)) .header-cta {
    font-size: 12px;
  }
  html:not(:lang(zh-CN)) .section-heading .section-description {
    min-width: 190px;
  }
}
@media (min-width: 651px) and (max-width: 900px) {
  .site-header {
    height: auto;
    min-height: 94px;
    flex-wrap: wrap;
    gap: 13px;
    padding-top: 18px;
    padding-bottom: 13px;
  }
  .site-header nav {
    order: 3;
    width: 100%;
    justify-content: center;
  }
}
@media (max-width: 650px) {
  .header-actions {
    gap: 8px;
  }
  .language-control summary {
    min-width: 78px;
    font-size: 12px;
    padding: 8px;
  }
  .header-cta {
    gap: 10px;
    font-size: 12px;
    padding: 8px 10px;
  }
  .site-header nav {
    gap: 14px;
  }
  html:not(:lang(zh-CN)) .site-header nav {
    font-size: 12px;
    gap: 12px;
  }
  html:not(:lang(zh-CN)) .hero h1 {
    font-size: clamp(39px, 11.5vw, 62px);
  }
  html:not(:lang(zh-CN)) .hero-tags {
    gap: 16px;
    font-size: 11px;
  }
  html:not(:lang(zh-CN)) .hero-actions {
    gap: 18px;
  }
  html:not(:lang(zh-CN)) .section-heading .section-description {
    padding-top: 0;
    min-width: 0;
  }
  html:not(:lang(zh-CN)) .scenario-tabs button {
    padding: 8px 6px;
    font-size: 12px;
  }
  html:not(:lang(zh-CN)) .process-steps {
    font-size: 9px;
    gap: 5px;
  }
  html:not(:lang(zh-CN)) .process-steps i {
    width: 5px;
  }
  html:not(:lang(zh-CN)) .engine-label {
    display: none;
  }
  html:not(:lang(zh-CN)) .hero-footer > span {
    max-width: 175px;
  }
  html:not(:lang(zh-CN)) .use-card h3 {
    min-height: 0;
  }
  html:not(:lang(zh-CN)) .compare-intro h1 {
    font-size: clamp(30px, 8.3vw, 48px);
  }
  html:not(:lang(zh-CN)) .path-heading h3 span {
    font-size: 11px;
  }
  html:not(:lang(zh-CN)) .paths-toolbar h2 {
    font-size: 1rem;
  }
  html:not(:lang(zh-CN)) .footer-top {
    gap: 18px;
  }
  html:not(:lang(zh-CN)) .footer-top > a:last-child {
    font-size: 10px;
  }
}
@media (max-width: 360px) {
  .header-cta {
    font-size: 11px;
    gap: 6px;
    padding-inline: 8px;
  }
  .language-control summary {
    min-width: 70px;
    padding: 7px;
    gap: 5px;
  }
  .header-actions {
    gap: 6px;
  }
  html:not(:lang(zh-CN)) .hero-tags {
    gap: 11px;
    font-size: 10px;
  }
}

/* ---- 长文案允许换行；东亚文字沿用系统字体与自然字距 ---- */
.hero-copy, .compare-intro-grid > div, .compare-lead { min-width: 0; }
.site-header > nav { flex-wrap: wrap; }
.header-cta { max-width: 190px; }
.hero h1, .compare-intro h1, .section-heading h2 { overflow-wrap: anywhere; }
.hero h1 .accent { hyphens: auto; }
html:is(:lang(ja), :lang(ko)) .hero h1 {
  font-family: var(--font);
  font-size: clamp(36px, 4.7vw, 66px);
  letter-spacing: -0.025em;
  line-height: 1.3;
}
html:is(:lang(ja), :lang(ko)) .compare-intro h1 {
  font-family: var(--font);
  letter-spacing: -0.025em;
}
@media (max-width: 650px) {
  .header-cta { max-width: 125px; line-height: 1.4; }
  .hero-actions { flex-wrap: wrap; }
  .hero .eyebrow { font-size: 10px; letter-spacing: 1px; }
  .hero-footer > span { overflow-wrap: anywhere; }
  .hero-tags { flex-wrap: wrap; row-gap: 8px; }
  .scenario-tabs { flex-wrap: wrap; }
  .scenario-tabs button { min-width: 0; overflow-wrap: anywhere; }
  .panel-label { flex-wrap: wrap; gap: 6px; }
  html:is(:lang(ja), :lang(ko)) .hero h1 { font-size: clamp(32px, 9vw, 48px); }
}