/* ==========================================================================
   通义千问 - 刊物卷首风格样式表 (Frontispiece / Editorial Preface Style)
   风格：刊物卷首
   场景：品牌主视觉 & 年终总结深度撰写
   核心规范：
   1. 第一屏为纯粹刊物卷首：只有一段卷首语和落款，严禁放插图，署名在段后，不在页眉
   2. 字体：卷首正文楷体 (Kaiti / STKaiti)，落款小宋体 (Songti / SimSun)
   3. 内容：卷首正文提到「千问」与「qwen AI」，落款标注「千问官网」
   4. 滚动进入第二屏后，才允许出现产品入口（千问网页版、千问办公）与顶栏导航及后续各板块
   5. 坚决不要卷首插图，保持顶级人文刊物卷首的纯净典雅意境
   ========================================================================== */

:root {
  --font-kaiti: "Kaiti SC", "STKaiti", "KaiTi", "BiauKai", serif;
  --font-serif: "Songti SC", "Source Han Serif CN", SimSun, "Noto Serif SC", STSong, serif;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "Consolas", "Courier New", monospace;

  /* 宣纸墨色与典雅矿物色系 */
  --color-paper-preface: #fbf9f4;
  --color-paper-pure: #ffffff;
  --color-paper-subtle: #f4efe6;
  --color-ink-deep: #161413;
  --color-ink-text: #2c2926;
  --color-ink-muted: #6a645b;
  --color-ink-light: #9e978c;
  --color-line-soft: #dfd9ce;
  --color-accent-cinnabar: #9c3b28;

  --container-max: 1220px;
}

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

body {
  background-color: var(--color-paper-preface);
  color: var(--color-ink-text);
  font-family: var(--font-serif);
  line-height: 1.85;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.layout-container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-serif);
  color: var(--color-ink-deep);
  font-weight: 700;
  letter-spacing: -0.01em;
}

a {
  color: inherit;
  text-decoration: none;
}

/* ==========================================================================
   【核心风格】第一屏纯粹刊物卷首（FRONTISPIECE PREFACE SCREEN）
   布局规范：
   - 第一屏只有一段卷首语和落款，充满视口高度（min-height: 100vh）
   - 绝不放卷首插图！
   - 署名在段后（不在页眉），落款「千问官网」，字体小宋
   - 卷首语正文采用楷体，提到「千问」与「qwen AI」
   - 底部指示箭头引导滚动至第二屏
   ========================================================================== */
.frontispiece-screen {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 60px 24px;
  background-color: var(--color-paper-preface);
  position: relative;
  border-bottom: 1px solid var(--color-line-soft);
}

.frontispiece-content-box {
  max-width: 820px;
  width: 100%;
  margin: auto;
}

/* 极简卷首眉标（仅留纪年，绝无商业署名与页眉署名） */
.frontispiece-volume-mark {
  font-family: var(--font-serif);
  font-size: 0.88rem;
  letter-spacing: 0.25em;
  color: var(--color-accent-cinnabar);
  margin-bottom: 36px;
  text-align: center;
  display: block;
  text-transform: uppercase;
}

/* 卷首语段落：字体楷体，行距舒缓，文辞深邃，提及千问与 qwen AI，坚决不配图 */
.frontispiece-essay-p {
  font-family: var(--font-kaiti);
  font-size: 1.35rem;
  line-height: 2.2;
  color: var(--color-ink-deep);
  text-indent: 2em;
  text-align: justify;
  margin-bottom: 32px;
  letter-spacing: 0.04em;
}

@media (max-width: 768px) {
  .frontispiece-essay-p {
    font-size: 1.15rem;
    line-height: 2;
  }
}

/* 署名紧跟在段落后面，不在页眉；字体小宋 */
.frontispiece-signature-row {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  margin-top: 24px;
}

.frontispiece-sign-text {
  font-family: var(--font-serif);
  font-size: 0.95rem;
  color: var(--color-ink-deep);
  letter-spacing: 0.15em;
  font-weight: 600;
}

.frontispiece-sign-date {
  font-family: var(--font-serif);
  font-size: 0.82rem;
  color: var(--color-ink-muted);
  letter-spacing: 0.1em;
  margin-top: 4px;
}

/* 引导下滚提示（极简指示线） */
.frontispiece-scroll-indicator {
  margin-top: 40px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--color-ink-light);
  font-family: var(--font-serif);
  font-size: 0.8rem;
  letter-spacing: 0.12em;
}

.scroll-down-arrow {
  display: inline-block;
  font-size: 1.1rem;
  animation: bounceDown 2s infinite ease-in-out;
}

@keyframes bounceDown {
  0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
  40% { transform: translateY(6px); }
  60% { transform: translateY(3px); }
}

/* ==========================================================================
   第二屏：产品与入口呈现（从此处起才允许出现顶栏、产品入口千问网页版、千问办公）
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(251, 249, 244, 0.96);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-line-soft);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  gap: 20px;
}

.brand-wrapper {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-logo-frame {
  width: 38px;
  height: 38px;
  background: var(--color-ink-deep);
  display: flex;
  align-items: center;
  justify-content: center;
}

.brand-logo {
  width: 24px;
  height: 24px;
  object-fit: contain;
}

.brand-text {
  display: flex;
  flex-direction: column;
}

.brand-title {
  font-size: 1.12rem;
  font-weight: 700;
  color: var(--color-ink-deep);
  letter-spacing: 0.04em;
  line-height: 1.2;
}

.brand-sub {
  font-size: 0.68rem;
  font-family: var(--font-sans);
  color: var(--color-ink-muted);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.nav-anchors {
  display: flex;
  align-items: center;
  gap: 22px;
  list-style: none;
}

@media (max-width: 1040px) {
  .nav-anchors {
    display: none;
  }
}

.nav-link {
  font-size: 0.88rem;
  font-family: var(--font-serif);
  color: var(--color-ink-text);
  padding: 6px 0;
  position: relative;
  transition: color 0.2s ease;
}

.nav-link:hover {
  color: var(--color-accent-cinnabar);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--color-accent-cinnabar);
  transition: width 0.25s ease;
}

.nav-link:hover::after {
  width: 100%;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.btn-header-login {
  padding: 8px 18px;
  font-size: 0.85rem;
  font-family: var(--font-serif);
  color: var(--color-ink-deep);
  border: 1px solid var(--color-line-soft);
  background: var(--color-paper-pure);
  transition: all 0.2s ease;
}

.btn-header-login:hover {
  border-color: var(--color-ink-deep);
}

.btn-header-primary {
  padding: 8px 20px;
  font-size: 0.85rem;
  font-family: var(--font-serif);
  font-weight: 600;
  color: var(--color-paper-pure);
  background: var(--color-ink-deep);
  border: 1px solid var(--color-ink-deep);
  transition: all 0.2s ease;
}

.btn-header-primary:hover {
  background: var(--color-accent-cinnabar);
  border-color: var(--color-accent-cinnabar);
}

/* ==========================================================================
   第二屏：首屏入口与提问框（千问网页版、千问办公入口）
   ========================================================================== */
.hero-section {
  padding: 56px 0 44px;
  border-bottom: 1px solid var(--color-line-soft);
}

.hero-status-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-line-soft);
}

.hero-status-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.78rem;
  font-family: var(--font-mono);
  color: var(--color-ink-muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.hero-spec-tag {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-accent-cinnabar);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.hero-title-box {
  margin-bottom: 20px;
}

.hero-h1 {
  font-size: 2.15rem;
  font-weight: 700;
  color: var(--color-ink-deep);
  line-height: 1.35;
  letter-spacing: -0.01em;
}

@media (max-width: 768px) {
  .hero-h1 {
    font-size: 1.6rem;
  }
}

.hero-desc {
  font-size: 1.05rem;
  color: var(--color-ink-text);
  max-width: 880px;
  line-height: 1.9;
  margin-bottom: 32px;
}

/* 核心产品入口卡片：千问网页版、千问办公 */
.hero-product-entries {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-bottom: 36px;
  max-width: 820px;
}

@media (max-width: 680px) {
  .hero-product-entries {
    grid-template-columns: 1fr;
  }
}

.entry-card-box {
  background: var(--color-paper-pure);
  border: 1px solid var(--color-line-soft);
  padding: 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all 0.2s ease;
}

.entry-card-box:hover {
  border-color: var(--color-ink-deep);
}

.entry-card-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--color-accent-cinnabar);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 6px;
}

.entry-card-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-ink-deep);
  margin-bottom: 8px;
}

.entry-card-desc {
  font-size: 0.86rem;
  color: var(--color-ink-muted);
  line-height: 1.65;
  margin-bottom: 16px;
}

.entry-card-btn {
  display: inline-block;
  align-self: flex-start;
  font-size: 0.85rem;
  font-weight: 600;
  padding: 6px 16px;
  border: 1px solid var(--color-ink-deep);
  background: transparent;
  color: var(--color-ink-deep);
  transition: all 0.2s ease;
}

.entry-card-btn:hover {
  background: var(--color-ink-deep);
  color: #fff;
}

.hero-search-box {
  margin-bottom: 44px;
}

.hero-search-form {
  display: flex;
  align-items: stretch;
  background: var(--color-paper-pure);
  border: 1px solid var(--color-ink-deep);
  max-width: 820px;
}

.hero-search-input {
  flex: 1;
  border: none;
  padding: 16px 20px;
  font-family: var(--font-serif);
  font-size: 0.95rem;
  color: var(--color-ink-deep);
  outline: none;
  background: transparent;
}

.hero-search-btn {
  border: none;
  background: var(--color-ink-deep);
  color: var(--color-paper-pure);
  font-family: var(--font-serif);
  font-size: 0.92rem;
  font-weight: 600;
  padding: 0 28px;
  cursor: pointer;
  transition: background 0.2s ease;
}

.hero-search-btn:hover {
  background: var(--color-accent-cinnabar);
}

/* ==========================================================================
   2. 信任：客户名和四个数字
   ========================================================================== */
.trust-section {
  padding: 48px 0;
  border-bottom: 1px solid var(--color-line-soft);
  background: var(--color-paper-pure);
}

.trust-brands-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 36px;
  padding-bottom: 24px;
  border-bottom: 1px dashed var(--color-line-soft);
}

.trust-brand-item {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--color-ink-muted);
  letter-spacing: 0.05em;
}

.metrics-4-col {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

@media (max-width: 800px) {
  .metrics-4-col {
    grid-template-columns: repeat(2, 1fr);
  }
}

.metric-card {
  padding: 16px;
  border-left: 1px solid var(--color-ink-deep);
}

.metric-number {
  font-family: var(--font-mono);
  font-size: 2.5rem;
  font-weight: 600;
  line-height: 1;
  color: var(--color-ink-deep);
  margin-bottom: 8px;
}

.metric-label {
  font-size: 0.88rem;
  color: var(--color-ink-muted);
  line-height: 1.5;
}

/* ==========================================================================
   3. 能力：4 列 × 2 行，只有图标、标题和两行字
   ========================================================================== */
.capabilities-section {
  padding: 60px 0;
  border-bottom: 1px solid var(--color-line-soft);
}

.section-head-bar {
  margin-bottom: 40px;
}

.section-tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-accent-cinnabar);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 8px;
}

.section-h2 {
  font-size: 1.85rem;
  font-weight: 700;
  color: var(--color-ink-deep);
  line-height: 1.3;
}

.cap-grid-4x2 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

@media (max-width: 960px) {
  .cap-grid-4x2 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 520px) {
  .cap-grid-4x2 {
    grid-template-columns: 1fr;
  }
}

.cap-item-box {
  background: var(--color-paper-pure);
  border: 1px solid var(--color-line-soft);
  padding: 24px;
  transition: border-color 0.2s ease;
}

.cap-item-box:hover {
  border-color: var(--color-ink-deep);
}

.cap-icon {
  width: 32px;
  height: 32px;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-paper-subtle);
  color: var(--color-ink-deep);
  font-family: var(--font-mono);
  font-size: 0.95rem;
  font-weight: 700;
}

.cap-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-ink-deep);
  margin-bottom: 8px;
}

.cap-two-lines {
  font-size: 0.85rem;
  color: var(--color-ink-muted);
  line-height: 1.6;
}

/* ==========================================================================
   4. 目录：两组，每组 3 张卡，带状态和「试用 / 文档」
   ========================================================================== */
.catalog-section {
  padding: 60px 0;
  border-bottom: 1px solid var(--color-line-soft);
  background: var(--color-paper-pure);
}

.catalog-group-block {
  margin-bottom: 40px;
}

.catalog-group-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-ink-deep);
  border-bottom: 1px solid var(--color-line-soft);
  padding-bottom: 10px;
  margin-bottom: 24px;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
}

.catalog-cards-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

@media (max-width: 860px) {
  .catalog-cards-3 {
    grid-template-columns: 1fr;
  }
}

.catalog-card {
  border: 1px solid var(--color-line-soft);
  background: var(--color-paper-preface);
  padding: 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.card-top-status {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}

.status-badge {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 2px 8px;
  background: var(--color-paper-pure);
  border: 1px solid var(--color-line-soft);
  color: var(--color-ink-muted);
}

.status-badge.active {
  border-color: var(--color-accent-cinnabar);
  color: var(--color-accent-cinnabar);
}

.card-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-ink-deep);
  margin-bottom: 10px;
}

.card-summary {
  font-size: 0.88rem;
  color: var(--color-ink-muted);
  line-height: 1.7;
  margin-bottom: 20px;
  flex: 1;
}

.card-actions-bar {
  display: flex;
  gap: 12px;
  border-top: 1px solid var(--color-line-soft);
  padding-top: 14px;
}

.card-btn-action {
  font-size: 0.82rem;
  font-family: var(--font-serif);
  font-weight: 600;
  padding: 6px 14px;
  border: 1px solid var(--color-ink-deep);
  background: transparent;
  color: var(--color-ink-deep);
  transition: all 0.2s ease;
}

.card-btn-action:hover {
  background: var(--color-ink-deep);
  color: var(--color-paper-pure);
}

/* ==========================================================================
   5. 场景：3 列 × 2 行（合理插入 1.webp-4.webp）
   ========================================================================== */
.scenes-section {
  padding: 60px 0;
  border-bottom: 1px solid var(--color-line-soft);
}

.scenes-grid-3x2 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

@media (max-width: 900px) {
  .scenes-grid-3x2 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 600px) {
  .scenes-grid-3x2 {
    grid-template-columns: 1fr;
  }
}

.scene-card {
  background: var(--color-paper-pure);
  border: 1px solid var(--color-line-soft);
  display: flex;
  flex-direction: column;
}

.scene-image-wrapper {
  width: 100%;
  height: 190px;
  overflow: hidden;
  background: var(--color-paper-subtle);
  border-bottom: 1px solid var(--color-line-soft);
}

.scene-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.scene-content {
  padding: 20px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.scene-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--color-accent-cinnabar);
  margin-bottom: 6px;
}

.scene-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-ink-deep);
  margin-bottom: 8px;
}

.scene-desc {
  font-size: 0.85rem;
  color: var(--color-ink-muted);
  line-height: 1.7;
}

/* ==========================================================================
   6. 演示：左边任务，右边结果
   ========================================================================== */
.demo-section {
  padding: 60px 0;
  border-bottom: 1px solid var(--color-line-soft);
  background: var(--color-paper-pure);
}

.demo-two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

@media (max-width: 860px) {
  .demo-two-col {
    grid-template-columns: 1fr;
  }
}

.demo-card-pane {
  border: 1px solid var(--color-line-soft);
  padding: 28px;
  background: var(--color-paper-preface);
}

.demo-pane-head {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--color-accent-cinnabar);
  border-bottom: 1px solid var(--color-line-soft);
  padding-bottom: 8px;
  margin-bottom: 16px;
}

.demo-task-h3 {
  font-size: 1.25rem;
  margin-bottom: 12px;
}

.demo-output-quote {
  font-family: var(--font-serif);
  font-size: 0.95rem;
  line-height: 1.85;
  color: var(--color-ink-text);
  background: var(--color-paper-pure);
  border: 1px solid var(--color-line-soft);
  padding: 20px;
  margin-top: 12px;
}

/* ==========================================================================
   7. 开发者：左边卖点，右边可切换的代码
   ========================================================================== */
.dev-section {
  padding: 60px 0;
  border-bottom: 1px solid var(--color-line-soft);
}

.dev-two-col {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 32px;
}

@media (max-width: 880px) {
  .dev-two-col {
    grid-template-columns: 1fr;
  }
}

.dev-points-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-top: 20px;
}

.dev-point-item {
  border-left: 2px solid var(--color-ink-deep);
  padding-left: 16px;
}

.dev-point-title {
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--color-ink-deep);
  margin-bottom: 4px;
}

.dev-point-desc {
  font-size: 0.85rem;
  color: var(--color-ink-muted);
  line-height: 1.6;
}

.code-window {
  background: var(--color-ink-deep);
  border: 1px solid var(--color-ink-deep);
  color: #eed8b8;
  overflow: hidden;
}

.code-tabs-nav {
  display: flex;
  background: #201e1c;
  border-bottom: 1px solid #383430;
}

.code-tab-btn {
  padding: 10px 18px;
  background: transparent;
  border: none;
  color: #a89f92;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  cursor: pointer;
  border-right: 1px solid #383430;
  transition: all 0.2s ease;
}

.code-tab-btn.active,
.code-tab-btn:hover {
  background: var(--color-ink-deep);
  color: #fff;
}

.code-body-pre {
  padding: 20px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  line-height: 1.7;
  overflow-x: auto;
}

/* ==========================================================================
   8. 企业：3 列 × 2 行
   ========================================================================== */
.enterprise-section {
  padding: 60px 0;
  border-bottom: 1px solid var(--color-line-soft);
  background: var(--color-paper-pure);
}

.ent-grid-3x2 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

@media (max-width: 900px) {
  .ent-grid-3x2 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 600px) {
  .ent-grid-3x2 {
    grid-template-columns: 1fr;
  }
}

.ent-card {
  border: 1px solid var(--color-line-soft);
  padding: 24px;
  background: var(--color-paper-preface);
}

.ent-card-h4 {
  font-size: 1.08rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--color-ink-deep);
}

.ent-card-p {
  font-size: 0.86rem;
  color: var(--color-ink-muted);
  line-height: 1.7;
}

/* ==========================================================================
   9. 下载和帮助：各 5 列
   ========================================================================== */
.downloads-help-section {
  padding: 60px 0;
  border-bottom: 1px solid var(--color-line-soft);
}

.five-col-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 18px;
  margin-top: 20px;
}

@media (max-width: 960px) {
  .five-col-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 600px) {
  .five-col-grid {
    grid-template-columns: 1fr;
  }
}

.five-item-card {
  background: var(--color-paper-pure);
  border: 1px solid var(--color-line-soft);
  padding: 18px;
  text-align: center;
}

.five-item-title {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 6px;
  color: var(--color-ink-deep);
}

.five-item-desc {
  font-size: 0.78rem;
  color: var(--color-ink-muted);
  line-height: 1.5;
}

/* ==========================================================================
   10. 问答：默认折叠，点开才看步骤
   ========================================================================== */
.faq-section {
  padding: 60px 0;
  border-bottom: 1px solid var(--color-line-soft);
  background: var(--color-paper-pure);
}

.faq-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  max-width: 920px;
}

.faq-details {
  border: 1px solid var(--color-line-soft);
  background: var(--color-paper-preface);
}

.faq-summary {
  padding: 18px 24px;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-ink-deep);
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.faq-summary::-webkit-details-marker {
  display: none;
}

.faq-toggle-icon {
  font-family: var(--font-mono);
  font-size: 1.2rem;
}

.faq-content-drawer {
  padding: 0 24px 20px;
  border-top: 1px dashed var(--color-line-soft);
  margin-top: 6px;
}

.faq-step-line {
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--color-ink-text);
  margin-top: 10px;
}

/* ==========================================================================
   11. 页脚：品牌说明加四列链接
   ========================================================================== */
.site-footer {
  padding: 64px 0 32px;
  background: #161413;
  color: #cfc8be;
}

.footer-top-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr 1fr;
  gap: 32px;
  margin-bottom: 48px;
}

@media (max-width: 960px) {
  .footer-top-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 600px) {
  .footer-top-grid {
    grid-template-columns: 1fr;
  }
}

.footer-brand-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: #fff;
  letter-spacing: 0.05em;
  margin-bottom: 12px;
}

.footer-brand-desc {
  font-size: 0.85rem;
  line-height: 1.8;
  color: #9e978c;
  padding-right: 24px;
}

.footer-col-title {
  font-size: 0.9rem;
  font-weight: 700;
  color: #fff;
  letter-spacing: 0.08em;
  border-bottom: 1px solid #332f2b;
  padding-bottom: 8px;
  margin-bottom: 14px;
}

.footer-links-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links-list a {
  font-size: 0.82rem;
  color: #a89f92;
  transition: color 0.2s ease;
}

.footer-links-list a:hover {
  color: #fff;
}

.footer-bottom-row {
  border-top: 1px solid #2b2724;
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  font-size: 0.75rem;
  color: #6a645b;
  font-family: var(--font-mono);
}