/* ==========================================================================
   通义千问官方网站 - 倒读标题风主题样式表 (Inverted Typography Style)
   设计语言:
     - 风格：颠倒 (Inverted)
     - 场景：品牌主视觉
     - 布局：主标题上下颠倒放在上半，正向副标题在下半，两者互相作为注释
     - 风格说明：只翻标题，不翻整页。纯粹黑白印刷质感，倒字仍然是印刷体而非手写。
     - 字体规范：主标题特黑体 ("Arial Black", SimHei, "PingFang SC", sans-serif)，副标题优雅宋体 ("Noto Serif SC", SimSun, serif)
     - 色彩体系：纯白 #FFFFFF、极浅纸灰 #F8F9FA、纯黑 #000000、深炭灰 #1A1A1A、印刷细灰 #767676、边框线 #E5E5E5
   ========================================================================== */

@charset "UTF-8";

:root {
  --bg-pure: #FFFFFF;
  --bg-subtle: #F8F9FA;
  --bg-card: #FFFFFF;
  --text-pure: #000000;
  --text-primary: #111111;
  --text-secondary: #555555;
  --text-muted: #767676;
  --border-dark: #000000;
  --border-light: #E5E5E5;
  --border-mid: #D1D5DB;
  --font-heavy-black: "Arial Black", "Impact", "PingFang SC", "Heiti SC", "SimHei", "Microsoft YaHei", sans-serif;
  --font-serif: "Noto Serif SC", "Source Han Serif SC", "SimSun", "Songti SC", STSong, serif;
  --font-mono: "Consolas", "Monaco", "Courier New", monospace;
  --radius-none: 0px;
  --radius-sm: 4px;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  background-color: var(--bg-pure);
}

body {
  font-family: var(--font-serif);
  color: var(--text-primary);
  background-color: var(--bg-pure);
  line-height: 1.75;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* 顶部固定导航栏：标志、七个锚点、登录、开始使用 */
.header-nav {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(8px);
  border-bottom: 2px solid var(--border-dark);
}

.nav-container {
  max-width: 1360px;
  margin: 0 auto;
  padding: 0.85rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand-wrap {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--text-pure);
}

.brand-wrap img {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1.5px solid var(--border-dark);
  padding: 1px;
}

.brand-title-box {
  display: flex;
  flex-direction: column;
}

.brand-title {
  font-family: var(--font-heavy-black);
  font-size: 1.2rem;
  letter-spacing: 1px;
  line-height: 1.2;
}

.brand-sub {
  font-family: var(--font-serif);
  font-size: 0.72rem;
  color: var(--text-muted);
  letter-spacing: 2px;
}

/* 七个核心锚点导航 */
.nav-menu {
  display: flex;
  list-style: none;
  gap: 1rem;
  align-items: center;
}

.nav-menu li a {
  text-decoration: none;
  color: var(--text-primary);
  font-size: 0.9rem;
  font-family: var(--font-serif);
  padding: 4px 6px;
  border-bottom: 2px solid transparent;
  transition: all 0.2s ease;
}

.nav-menu li a:hover,
.nav-menu li a.active {
  border-color: var(--border-dark);
  color: var(--text-pure);
  font-weight: 700;
}

/* 顶栏右侧动作组：登录、开始使用 */
.nav-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.btn-nav-login {
  text-decoration: none;
  color: var(--text-pure);
  font-size: 0.88rem;
  padding: 6px 14px;
  border: 1px solid var(--border-dark);
  font-weight: 600;
  transition: all 0.2s ease;
}

.btn-nav-login:hover {
  background: var(--bg-subtle);
}

.btn-nav-start {
  text-decoration: none;
  background: var(--text-pure);
  color: #fff !important;
  font-size: 0.88rem;
  padding: 6px 16px;
  border: 1px solid var(--border-dark);
  font-weight: 600;
  transition: all 0.2s ease;
}

.btn-nav-start:hover {
  background: #333333;
}

/* 主内容包裹 */
.main-wrapper {
  max-width: 1360px;
  margin: 0 auto;
  padding: 2.5rem 1.5rem 4rem;
}

/* ==========================================================================
   首屏视觉核心：倒读标题 (Inverted Hero Header)
   - 布局：主标题上下颠倒放在上半，正向副标题在下半，两者互相作为注释
   - 风格：黑白，印刷体特黑体，副标题宋体
   ========================================================================== */
.hero-inverted-section {
  padding: 3rem 1rem 4rem;
  text-align: center;
  border-bottom: 2px solid var(--border-dark);
  margin-bottom: 3.5rem;
  position: relative;
}

.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 4px 16px;
  border: 1px solid var(--border-dark);
  background: var(--bg-subtle);
  font-size: 0.82rem;
  font-family: var(--font-mono);
  margin-bottom: 2rem;
  text-transform: uppercase;
}

.status-dot {
  width: 8px;
  height: 8px;
  background: var(--text-pure);
  border-radius: 50%;
  display: inline-block;
}

/* 颠倒标题视觉容器 */
.inverted-title-container {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 2.5rem 3rem;
  border: 2px solid var(--border-dark);
  background: #FFFFFF;
  box-shadow: 12px 12px 0px var(--border-dark);
  margin: 0 auto 2.2rem;
  max-width: 900px;
}

/* 上半部分：主标题上下颠倒（只翻字，不翻整页，印刷特黑体） */
.inverted-word-block {
  transform: rotate(180deg);
  display: inline-block;
  font-family: var(--font-heavy-black);
  font-size: 6rem;
  line-height: 1;
  letter-spacing: 12px;
  color: var(--text-pure);
  margin-bottom: 1.5rem;
  user-select: none;
}

/* 分割刻度线（注释标注线） */
.inverted-annotation-line {
  width: 100%;
  height: 2px;
  background: var(--border-dark);
  position: relative;
  margin: 0.5rem 0 1.25rem;
}

.inverted-annotation-line::before {
  content: "〔 注 释 / ANNOTATION 〕";
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: #fff;
  padding: 0 14px;
  font-size: 0.72rem;
  font-family: var(--font-mono);
  letter-spacing: 3px;
  color: var(--text-muted);
}

/* 下半部分：正向副标题宋体：qwen / 通义千问 / qianwen */
.inverted-sub-block {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: 6px;
  color: var(--text-primary);
  margin-top: 0.25rem;
}

/* H1 语义标题与指定 Title 完全一致 */
.page-h1-heading {
  font-size: 1.6rem;
  font-family: var(--font-heavy-black);
  color: var(--text-pure);
  margin-bottom: 1rem;
  line-height: 1.4;
  letter-spacing: 1px;
}

/* 一句话说明 */
.hero-motto-statement {
  font-size: 1.35rem;
  font-family: var(--font-serif);
  font-weight: 700;
  letter-spacing: 3px;
  color: var(--text-pure);
  margin-bottom: 1.5rem;
  display: inline-block;
  padding: 4px 18px;
  border-top: 1px solid var(--border-dark);
  border-bottom: 1px solid var(--border-dark);
}

.hero-paragraph-desc {
  max-width: 820px;
  margin: 0 auto 2.5rem;
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.8;
}

/* 一条提问框 */
.hero-query-row {
  max-width: 780px;
  margin: 0 auto 2rem;
  display: flex;
  border: 2px solid var(--border-dark);
  box-shadow: 6px 6px 0px var(--border-dark);
  background: #fff;
}

.hero-query-input {
  flex-grow: 1;
  padding: 16px 20px;
  border: none;
  outline: none;
  font-family: var(--font-serif);
  font-size: 1.05rem;
  color: var(--text-pure);
}

.hero-query-btn {
  background: var(--text-pure);
  color: #fff;
  border: none;
  padding: 0 30px;
  font-family: var(--font-heavy-black);
  font-size: 1rem;
  letter-spacing: 2px;
  cursor: pointer;
  transition: background 0.2s ease;
}

.hero-query-btn:hover {
  background: #333333;
}

.hero-query-tags {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.hero-query-tags span {
  padding: 2px 10px;
  border: 1px dashed var(--border-mid);
  cursor: pointer;
}

/* ==========================================================================
   信任：客户名和四个数字 (Trust: Clients & 4 Stats)
   ========================================================================== */
.trust-section {
  padding: 2.5rem 0 3.5rem;
  border-bottom: 1px solid var(--border-light);
  margin-bottom: 3.5rem;
}

.clients-bar {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 2.5rem;
  flex-wrap: wrap;
  margin-bottom: 2.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px dashed var(--border-light);
}

.client-name-item {
  font-family: var(--font-heavy-black);
  font-size: 1.25rem;
  letter-spacing: 2px;
  color: var(--text-secondary);
  border: 1px solid var(--border-light);
  padding: 6px 20px;
}

.stats-grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  text-align: center;
}

.stat-item-box {
  padding: 1.5rem;
  border: 1px solid var(--border-dark);
  background: var(--bg-subtle);
}

.stat-number {
  font-family: var(--font-heavy-black);
  font-size: 2.6rem;
  color: var(--text-pure);
  line-height: 1.1;
  margin-bottom: 0.35rem;
}

.stat-label {
  font-size: 0.9rem;
  color: var(--text-muted);
  letter-spacing: 1px;
}

/* ==========================================================================
   能力：4 列 × 2 行，只有图标、标题和两行字 (Capabilities: 4 Cols × 2 Rows)
   ========================================================================== */
.section-common-head {
  margin-bottom: 2.2rem;
  text-align: center;
}

.section-tag-mono {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 2px;
  color: var(--text-muted);
  border: 1px solid var(--border-mid);
  padding: 2px 10px;
  margin-bottom: 0.6rem;
  text-transform: uppercase;
}

.section-main-title {
  font-family: var(--font-heavy-black);
  font-size: 2.2rem;
  letter-spacing: 2px;
  color: var(--text-pure);
}

.capabilities-grid-4x2 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-template-rows: repeat(2, auto);
  gap: 1.25rem;
  margin-bottom: 4rem;
}

.cap-card {
  border: 1px solid var(--border-dark);
  padding: 1.8rem 1.4rem;
  background: #fff;
  transition: all 0.2s ease;
}

.cap-card:hover {
  background: var(--bg-subtle);
  transform: translateY(-4px);
  box-shadow: 6px 6px 0px var(--border-dark);
}

.cap-icon {
  font-size: 2rem;
  margin-bottom: 1rem;
  display: inline-block;
}

.cap-card h3 {
  font-family: var(--font-heavy-black);
  font-size: 1.2rem;
  margin-bottom: 0.6rem;
  color: var(--text-pure);
}

.cap-card p {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ==========================================================================
   目录：两组，每组 3 张卡，带状态和「试用 / 文档」 (Catalog: 2 Groups × 3 Cards)
   ========================================================================== */
.catalog-section {
  margin-bottom: 4rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--border-light);
}

.catalog-group {
  margin-bottom: 2.5rem;
}

.catalog-group-title {
  font-family: var(--font-heavy-black);
  font-size: 1.35rem;
  margin-bottom: 1.25rem;
  padding-left: 10px;
  border-left: 4px solid var(--border-dark);
}

.catalog-grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.catalog-card {
  border: 1px solid var(--border-dark);
  padding: 1.75rem 1.5rem;
  background: #fff;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: 4px 4px 0px var(--border-dark);
}

.catalog-card-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.8rem;
}

.catalog-state-badge {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 2px 8px;
  background: var(--bg-subtle);
  border: 1px solid var(--border-mid);
  color: var(--text-primary);
}

.catalog-card h4 {
  font-family: var(--font-heavy-black);
  font-size: 1.2rem;
  margin-bottom: 0.5rem;
}

.catalog-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  line-height: 1.6;
}

.catalog-actions-row {
  display: flex;
  gap: 10px;
}

.btn-catalog-try {
  flex: 1;
  text-align: center;
  text-decoration: none;
  background: var(--text-pure);
  color: #fff;
  font-size: 0.88rem;
  padding: 8px 0;
  font-weight: 600;
  border: 1px solid var(--border-dark);
}

.btn-catalog-doc {
  flex: 1;
  text-align: center;
  text-decoration: none;
  background: #fff;
  color: var(--text-pure);
  font-size: 0.88rem;
  padding: 8px 0;
  font-weight: 600;
  border: 1px solid var(--border-dark);
}

.btn-catalog-try:hover {
  background: #333;
}

.btn-catalog-doc:hover {
  background: var(--bg-subtle);
}

/* ==========================================================================
   场景：3 列 × 2 行 (Scenarios: 3 Cols × 2 Rows)
   ========================================================================== */
.scenarios-grid-3x2 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(2, auto);
  gap: 1.5rem;
  margin-bottom: 4rem;
}

.scenario-card-box {
  border: 1px solid var(--border-dark);
  padding: 1.5rem;
  background: #fff;
}

.scenario-img-wrap {
  width: 100%;
  height: 180px;
  overflow: hidden;
  border: 1px solid var(--border-mid);
  margin-bottom: 1.2rem;
  background: var(--bg-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
}

.scenario-img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: grayscale(100%);
  transition: filter 0.3s ease;
}

.scenario-card-box:hover .scenario-img-wrap img {
  filter: grayscale(0%);
}

.scenario-card-box h4 {
  font-family: var(--font-heavy-black);
  font-size: 1.15rem;
  margin-bottom: 0.5rem;
}

.scenario-card-box p {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ==========================================================================
   演示：左边任务，右边结果 (Demo: Left Task vs Right Result)
   ========================================================================== */
.demo-section-box {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border: 2px solid var(--border-dark);
  box-shadow: 8px 8px 0px var(--border-dark);
  margin-bottom: 4rem;
  background: #fff;
}

.demo-task-side {
  padding: 2.5rem 2rem;
  border-right: 2px solid var(--border-dark);
  background: var(--bg-subtle);
}

.demo-task-side h3 {
  font-family: var(--font-heavy-black);
  font-size: 1.35rem;
  margin-bottom: 1.2rem;
}

.task-step-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-bottom: 1.8rem;
}

.task-step-item {
  display: flex;
  gap: 12px;
  font-size: 0.95rem;
}

.step-num {
  font-family: var(--font-mono);
  font-weight: 700;
  border: 1px solid var(--border-dark);
  width: 26px;
  height: 26px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #fff;
}

.demo-result-side {
  padding: 2.5rem 2rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.demo-result-side h3 {
  font-family: var(--font-heavy-black);
  font-size: 1.35rem;
  margin-bottom: 1.2rem;
}

.result-output-box {
  background: #111;
  color: #eee;
  padding: 1.5rem;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  line-height: 1.7;
  border-radius: var(--radius-sm);
  margin-bottom: 1.5rem;
}

/* ==========================================================================
   开发者：左边卖点，右边可切换的代码 (Developers: Left Pitch vs Right Tabs)
   ========================================================================== */
.dev-section-box {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  border: 2px solid var(--border-dark);
  box-shadow: 8px 8px 0px var(--border-dark);
  margin-bottom: 4rem;
  background: #fff;
}

.dev-pitch-side {
  padding: 2.5rem 2rem;
  border-right: 2px solid var(--border-dark);
}

.dev-pitch-side h3 {
  font-family: var(--font-heavy-black);
  font-size: 1.4rem;
  margin-bottom: 1.2rem;
}

.dev-pitch-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
}

.dev-pitch-item h4 {
  font-family: var(--font-heavy-black);
  font-size: 1.05rem;
  margin-bottom: 0.3rem;
}

.dev-pitch-item p {
  font-size: 0.88rem;
  color: var(--text-secondary);
}

.dev-code-side {
  background: #181818;
  color: #fff;
  display: flex;
  flex-direction: column;
}

.code-tabs-bar {
  display: flex;
  border-bottom: 1px solid #333;
}

.code-tab-btn {
  background: transparent;
  color: #aaa;
  border: none;
  padding: 12px 20px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  cursor: pointer;
}

.code-tab-btn.active {
  color: #fff;
  background: #252525;
  border-bottom: 2px solid #fff;
}

.code-pre-box {
  padding: 1.8rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.75;
  overflow-x: auto;
  color: #E2E8F0;
}

/* ==========================================================================
   企业：3 列 × 2 行 (Enterprise: 3 Cols × 2 Rows)
   ========================================================================== */
.enterprise-grid-3x2 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(2, auto);
  gap: 1.5rem;
  margin-bottom: 4rem;
}

.enterprise-card {
  border: 1px solid var(--border-dark);
  padding: 1.75rem 1.5rem;
  background: var(--bg-subtle);
  transition: all 0.2s ease;
}

.enterprise-card:hover {
  background: #fff;
  box-shadow: 6px 6px 0px var(--border-dark);
}

.enterprise-card h4 {
  font-family: var(--font-heavy-black);
  font-size: 1.2rem;
  margin-bottom: 0.6rem;
}

.enterprise-card p {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ==========================================================================
   下载和帮助：各 5 列 (Download 5 Cols & Help 5 Cols)
   ========================================================================== */
.col5-container {
  margin-bottom: 4rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--border-light);
}

.col5-title {
  font-family: var(--font-heavy-black);
  font-size: 1.4rem;
  margin-bottom: 1.5rem;
  text-align: center;
}

.grid-5-cols {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 1rem;
}

.col5-card {
  border: 1px solid var(--border-dark);
  padding: 1.5rem 1rem;
  text-align: center;
  background: #fff;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.col5-card:hover {
  box-shadow: 4px 4px 0px var(--border-dark);
}

.col5-icon {
  font-size: 1.8rem;
  margin-bottom: 0.8rem;
}

.col5-card h4 {
  font-family: var(--font-heavy-black);
  font-size: 1rem;
  margin-bottom: 0.4rem;
}

.col5-card p {
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.5;
  margin-bottom: 1.2rem;
  flex-grow: 1;
}

.btn-col5 {
  display: block;
  text-decoration: none;
  background: var(--text-pure);
  color: #fff;
  font-size: 0.82rem;
  padding: 6px 0;
  border: 1px solid var(--border-dark);
  font-weight: 600;
}

.btn-col5:hover {
  background: #333;
}

/* ==========================================================================
   问答：默认折叠，点开才看步骤 (FAQ: Default Collapsed Details)
   ========================================================================== */
.faq-section {
  max-width: 960px;
  margin: 0 auto 4.5rem;
}

.faq-details-item {
  border: 1px solid var(--border-dark);
  margin-bottom: 1rem;
  background: #fff;
  transition: all 0.2s ease;
}

.faq-details-item[open] {
  box-shadow: 5px 5px 0px var(--border-dark);
}

.faq-summary {
  padding: 1.25rem 1.5rem;
  font-family: var(--font-heavy-black);
  font-size: 1.1rem;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  user-select: none;
  list-style: none;
}

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

.faq-summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 1.4rem;
  font-weight: bold;
}

.faq-details-item[open] .faq-summary::after {
  content: "−";
}

.faq-body-steps {
  padding: 0 1.5rem 1.5rem;
  border-top: 1px dashed var(--border-light);
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.8;
}

.faq-steps-list {
  margin-top: 0.8rem;
  padding-left: 1.25rem;
}

.faq-steps-list li {
  margin-bottom: 0.4rem;
}

/* ==========================================================================
   页脚：品牌说明加四列链接 (Footer: Brand Pitch + 4 Columns)
   ========================================================================== */
.site-footer {
  background: #000;
  color: #fff;
  padding: 3.5rem 1.5rem 2rem;
  border-top: 4px solid var(--border-dark);
}

.footer-inner {
  max-width: 1360px;
  margin: 0 auto;
}

.footer-grid-brand-4cols {
  display: grid;
  grid-template-columns: 1.6fr repeat(4, 1fr);
  gap: 2.5rem;
  margin-bottom: 2.5rem;
}

.footer-brand-side h3 {
  font-family: var(--font-heavy-black);
  font-size: 1.4rem;
  margin-bottom: 1rem;
  letter-spacing: 2px;
}

.footer-brand-side p {
  font-size: 0.88rem;
  color: #A3A3A3;
  line-height: 1.8;
  max-width: 380px;
}

.footer-link-col h4 {
  font-family: var(--font-heavy-black);
  font-size: 0.95rem;
  letter-spacing: 1.5px;
  margin-bottom: 1rem;
  text-transform: uppercase;
  border-bottom: 1px solid #333;
  padding-bottom: 0.5rem;
}

.footer-link-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.footer-link-col ul li a {
  color: #A3A3A3;
  text-decoration: none;
  font-size: 0.86rem;
  transition: color 0.2s ease;
}

.footer-link-col ul li a:hover {
  color: #fff;
  text-decoration: underline;
}

.footer-bottom-bar {
  border-top: 1px solid #222;
  padding-top: 1.5rem;
  text-align: center;
  font-size: 0.82rem;
  color: #666;
}

/* 响应式断点 */
@media (max-width: 1100px) {
  .capabilities-grid-4x2 {
    grid-template-columns: repeat(2, 1fr);
  }
  .grid-5-cols {
    grid-template-columns: repeat(2, 1fr);
  }
  .demo-section-box,
  .dev-section-box {
    grid-template-columns: 1fr;
  }
  .demo-task-side,
  .dev-pitch-side {
    border-right: none;
    border-bottom: 2px solid var(--border-dark);
  }
  .footer-grid-brand-4cols {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .nav-menu {
    display: none;
  }
  .inverted-word-block {
    font-size: 4rem;
    letter-spacing: 6px;
  }
  .stats-grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
  .catalog-grid-3,
  .scenarios-grid-3x2,
  .enterprise-grid-3x2 {
    grid-template-columns: 1fr;
  }
  .footer-grid-brand-4cols {
    grid-template-columns: 1fr;
  }
}