/* ==========================================================================
   千问AI创作平台 - 跨页内文与中缝避让样式表 (Book Spread & Gutter Clearance Style)
   风格：跨页内文
   场景：千问官网
   核心特征：
   1. 内容分成左右两页，装订中缝严格设定为宽 36px，禁排区保持干干净净，任何字或笔画都不许进入中缝
   2. 绝对不设跨缝大标题，标题严格在单侧页内排布
   3. 字体：全篇纯正宋体 (Songti SC / Source Han Serif CN / SimSun / serif)
   4. 内容：左页标「通义千问」，右页入口「千问网页版」，页脚分别是「qwen」与「千问办公」
   5. 纸张质感：模拟精装典籍打开跨页，中缝凹陷装订暗影与页边留白
   ========================================================================== */

:root {
  --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;

  /* 经典典籍纸张与沉香墨色 */
  --color-spread-paper: #fcfaf4;
  --color-page-pure: #ffffff;
  --color-page-tint: #f5f0e6;
  --color-gutter-shadow: #e5ded0;
  --color-gutter-crease: #d3cbb9;
  --color-ink-black: #141312;
  --color-ink-charcoal: #282623;
  --color-ink-subtle: #635e55;
  --color-ink-light: #948d80;
  --color-line-grid: #ded8cb;
  --color-accent-vermilion: #9e3825;

  --gutter-width: 36px;
  --container-max: 1240px;
}

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

body {
  background-color: var(--color-spread-paper);
  color: var(--color-ink-charcoal);
  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-black);
  font-weight: 700;
  letter-spacing: -0.01em;
}

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

/* ==========================================================================
   1. 顶栏：标志、七个锚点、登录、开始使用
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(252, 250, 244, 0.96);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-line-grid);
}

.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-black);
  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-black);
  letter-spacing: 0.04em;
  line-height: 1.2;
}

.brand-sub {
  font-size: 0.68rem;
  font-family: var(--font-sans);
  color: var(--color-ink-subtle);
  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-charcoal);
  padding: 6px 0;
  position: relative;
  transition: color 0.2s ease;
}

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

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--color-accent-vermilion);
  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-black);
  border: 1px solid var(--color-line-grid);
  background: var(--color-page-pure);
  transition: all 0.2s ease;
}

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

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

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

/* ==========================================================================
   首屏与【跨页内文 / 中缝避让】核心视觉舞台 (SPREAD & GUTTER CLEARANCE)
   核心要求：
   - 左右两页，装订中缝宽 36px，禁排区保持干干净净
   - 任何笔画都不许进入中缝
   - 不要跨缝大标题
   - 字体：纯正宋体
   - 左页「通义千问」，右页入口「千问网页版」，页脚分别是「qwen」与「千问办公」
   ========================================================================== */
.hero-section {
  padding: 56px 0 44px;
  border-bottom: 1px solid var(--color-line-grid);
}

.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-grid);
}

.hero-status-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.78rem;
  font-family: var(--font-mono);
  color: var(--color-ink-subtle);
  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-vermilion);
  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-black);
  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-charcoal);
  max-width: 880px;
  line-height: 1.9;
  margin-bottom: 32px;
}

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

.hero-search-form {
  display: flex;
  align-items: stretch;
  background: var(--color-page-pure);
  border: 1px solid var(--color-ink-black);
  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-black);
  outline: none;
  background: transparent;
}

.hero-search-btn {
  border: none;
  background: var(--color-ink-black);
  color: var(--color-page-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-vermilion);
}

/* ==========================================================================
   【跨页内文舞台核心布局】
   双页容器：左右两页中间夹着 36px 装订中缝禁排区
   ========================================================================== */
.book-spread-container {
  display: grid;
  grid-template-columns: 1fr 36px 1fr; /* 左页 1fr，中缝 36px 禁排区，右页 1fr */
  margin-top: 36px;
  background: var(--color-page-pure);
  border: 1px solid var(--color-line-grid);
  box-shadow: 0 12px 36px rgba(0, 0, 0, 0.04);
  position: relative;
}

@media (max-width: 900px) {
  .book-spread-container {
    grid-template-columns: 1fr;
    grid-template-rows: auto auto auto;
  }
}

/* 中缝禁排区（装订中缝宽 36px，任何字都不许进入） */
.book-spine-gutter {
  width: 36px;
  background: linear-gradient(
    to right,
    rgba(211, 203, 185, 0.45) 0%,
    rgba(229, 222, 208, 0.9) 30%,
    rgba(211, 203, 185, 1) 50%,
    rgba(229, 222, 208, 0.9) 70%,
    rgba(211, 203, 185, 0.45) 100%
  );
  border-left: 1px solid var(--color-line-grid);
  border-right: 1px solid var(--color-line-grid);
  position: relative;
  overflow: hidden;
  user-select: none;
  pointer-events: none;
}

@media (max-width: 900px) {
  .book-spine-gutter {
    width: 100%;
    height: 36px;
    background: linear-gradient(
      to bottom,
      rgba(211, 203, 185, 0.45) 0%,
      rgba(211, 203, 185, 1) 50%,
      rgba(211, 203, 185, 0.45) 100%
    );
    border-left: none;
    border-right: none;
    border-top: 1px solid var(--color-line-grid);
    border-bottom: 1px solid var(--color-line-grid);
  }
}

/* 左页与右页基础结构 */
.book-page-leaf {
  padding: 44px 40px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  background: var(--color-page-pure);
  position: relative;
}

/* 左页内侧渐变投影（向中缝靠拢） */
.left-leaf {
  box-shadow: inset -16px 0 20px -16px rgba(0, 0, 0, 0.08);
}

/* 右页内侧渐变投影（向中缝靠拢） */
.right-leaf {
  box-shadow: inset 16px 0 20px -16px rgba(0, 0, 0, 0.08);
}

/* 单页眉线（绝无跨缝大标题，标题严格在单页内） */
.leaf-top-folio {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  border-bottom: 1px solid var(--color-line-grid);
  padding-bottom: 12px;
  margin-bottom: 24px;
}

.leaf-folio-label {
  font-family: var(--font-serif);
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--color-ink-black);
  letter-spacing: 0.06em;
}

.leaf-folio-meta {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--color-ink-light);
  letter-spacing: 0.1em;
}

/* 单页内标题（严禁跨缝） */
.leaf-h2-title {
  font-family: var(--font-serif);
  font-size: 1.45rem;
  font-weight: 700;
  color: var(--color-ink-black);
  margin-bottom: 16px;
  line-height: 1.4;
}

.leaf-prose-p {
  font-family: var(--font-serif);
  font-size: 0.98rem;
  line-height: 2;
  color: var(--color-ink-charcoal);
  margin-bottom: 18px;
  text-indent: 2em;
  text-align: justify;
}

.leaf-prose-p strong {
  color: var(--color-ink-black);
  font-weight: 700;
}

.leaf-callout-quote {
  border-left: 2px solid var(--color-ink-black);
  padding: 12px 18px;
  margin: 18px 0;
  background: var(--color-page-tint);
  font-family: var(--font-serif);
  font-size: 0.92rem;
  line-height: 1.85;
  color: var(--color-ink-charcoal);
}

/* 右页入口按钮卡 */
.right-entry-box {
  background: var(--color-spread-paper);
  border: 1px solid var(--color-line-grid);
  padding: 20px;
  margin-top: 14px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.right-entry-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-ink-black);
}

.right-entry-btn {
  display: inline-block;
  align-self: flex-start;
  padding: 8px 22px;
  background: var(--color-ink-black);
  color: var(--color-page-pure);
  font-family: var(--font-serif);
  font-size: 0.88rem;
  font-weight: 600;
  transition: all 0.2s ease;
}

.right-entry-btn:hover {
  background: var(--color-accent-vermilion);
}

/* 单页专属底栏页脚：左页标「qwen」，右页标「千问办公」 */
.leaf-bottom-footer {
  border-top: 1px solid var(--color-line-grid);
  padding-top: 14px;
  margin-top: 28px;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font-family: var(--font-serif);
}

.leaf-foot-slug {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--color-accent-vermilion);
  letter-spacing: 0.08em;
}

.leaf-foot-page-num {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--color-ink-light);
}

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

.trust-brand-item {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--color-ink-subtle);
  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-black);
}

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

.metric-label {
  font-size: 0.88rem;
  color: var(--color-ink-subtle);
  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-grid);
}

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

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

.section-h2 {
  font-size: 1.85rem;
  font-weight: 700;
  color: var(--color-ink-black);
  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-page-pure);
  border: 1px solid var(--color-line-grid);
  padding: 24px;
  transition: border-color 0.2s ease;
}

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

.cap-icon {
  width: 32px;
  height: 32px;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-page-tint);
  color: var(--color-ink-black);
  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-black);
  margin-bottom: 8px;
}

.cap-two-lines {
  font-size: 0.85rem;
  color: var(--color-ink-subtle);
  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-grid);
  background: var(--color-page-pure);
}

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

.catalog-group-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-ink-black);
  border-bottom: 1px solid var(--color-line-grid);
  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-grid);
  background: var(--color-spread-paper);
  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-page-pure);
  border: 1px solid var(--color-line-grid);
  color: var(--color-ink-subtle);
}

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

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

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

.card-actions-bar {
  display: flex;
  gap: 12px;
  border-top: 1px solid var(--color-line-grid);
  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-black);
  background: transparent;
  color: var(--color-ink-black);
  transition: all 0.2s ease;
}

.card-btn-action:hover {
  background: var(--color-ink-black);
  color: var(--color-page-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-grid);
}

.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-page-pure);
  border: 1px solid var(--color-line-grid);
  display: flex;
  flex-direction: column;
}

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

.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-vermilion);
  margin-bottom: 6px;
}

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

.scene-desc {
  font-size: 0.85rem;
  color: var(--color-ink-subtle);
  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-grid);
  background: var(--color-page-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-grid);
  padding: 28px;
  background: var(--color-spread-paper);
}

.demo-pane-head {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--color-accent-vermilion);
  border-bottom: 1px solid var(--color-line-grid);
  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-charcoal);
  background: var(--color-page-pure);
  border: 1px solid var(--color-line-grid);
  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-grid);
}

.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-black);
  padding-left: 16px;
}

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

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

.code-window {
  background: var(--color-ink-black);
  border: 1px solid var(--color-ink-black);
  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-black);
  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-grid);
  background: var(--color-page-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-grid);
  padding: 24px;
  background: var(--color-spread-paper);
}

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

.ent-card-p {
  font-size: 0.86rem;
  color: var(--color-ink-subtle);
  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-grid);
}

.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-page-pure);
  border: 1px solid var(--color-line-grid);
  padding: 18px;
  text-align: center;
}

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

.five-item-desc {
  font-size: 0.78rem;
  color: var(--color-ink-subtle);
  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-grid);
  background: var(--color-page-pure);
}

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

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

.faq-summary {
  padding: 18px 24px;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-ink-black);
  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-grid);
  margin-top: 6px;
}

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

/* ==========================================================================
   11. 页脚：品牌说明加四列链接
   ========================================================================== */
.site-footer {
  padding: 64px 0 32px;
  background: #141312;
  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: #948d80;
  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: #635e55;
  font-family: var(--font-mono);
}