/* ==========================================================================
   通义千问官方网站 - 窗套窗主题样式表 (Nested Windows Style)
   设计语言:
     - 风格：窗套窗 (Windows within Windows)
     - 场景：千问网页版 / 纯网页端轻量化体验
     - 布局：最内是输入，中层是会话，外层是站点框，三层窗框都可见
     - 特性：细线窗框 (1px solid)，纯不透明实色底 (无毛玻璃叠影)
     - 标题规范：标题栏等宽小字 (font-family: monospace; font-size: 0.78rem)
     - 三层标题：外层「通义千问」 / 中层「千问网页版」 / 内层「qwen」
     - 配色体系：
       - 画布底色：#F1F5F9 (浅蓝灰纸底)
       - 窗体底色：#FFFFFF (不透明实白)
       - 边框细线：#334155 (冷炭细实线 1px)
       - 标题栏底：#E2E8F0 (工程浅灰栏)
       - 点缀深蓝：#1E293B (主文字/外框)
       - 点缀亮蓝：#2563EB (状态与选中)
   ========================================================================== */

@charset "UTF-8";

:root {
  --bg-canvas: #F1F5F9;
  --bg-window: #FFFFFF;
  --bg-window-bar: #E2E8F0;
  --bg-window-inner: #F8FAFC;
  --line-window: #334155;
  --line-subtle: #CBD5E1;
  --text-main: #0F172A;
  --text-body: #334155;
  --text-muted: #64748B;
  --color-accent: #2563EB;
  --color-accent-soft: rgba(37, 99, 235, 0.08);
  --font-mono: "SF Mono", "Fira Code", "Consolas", "Roboto Mono", monospace;
  --font-serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", STSong, "SimSun", serif;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --shadow-window: 4px 4px 0px rgba(51, 65, 85, 0.15);
  --shadow-window-deep: 6px 6px 0px rgba(51, 65, 85, 0.2);
}

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

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

body {
  font-family: var(--font-sans);
  color: var(--text-main);
  background-color: var(--bg-canvas);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* ==========================================================================
   顶栏：标志、七个锚点、登录、开始使用
   ========================================================================== */
.header-nav {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: #FFFFFF;
  border-bottom: 1px solid var(--line-window);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.nav-container {
  max-width: 1360px;
  margin: 0 auto;
  padding: 0.75rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand-wrap {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text-main);
}

.brand-wrap img {
  width: 38px;
  height: 38px;
  border-radius: 4px;
  border: 1px solid var(--line-window);
  padding: 2px;
  background: #fff;
}

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

.brand-title {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  color: var(--text-main);
  line-height: 1.2;
}

.brand-sub {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
}

/* 七个锚点菜单 */
.nav-menu {
  display: flex;
  list-style: none;
  gap: 0.9rem;
  align-items: center;
}

.nav-menu li a {
  text-decoration: none;
  color: var(--text-body);
  font-size: 0.88rem;
  padding: 5px 8px;
  border: 1px solid transparent;
  border-radius: 3px;
  transition: all 0.2s ease;
}

.nav-menu li a:hover,
.nav-menu li a.active {
  color: var(--text-main);
  background: var(--bg-window-bar);
  border-color: var(--line-window);
}

/* 顶栏右侧：登录、开始使用 */
.nav-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.btn-nav-login {
  text-decoration: none;
  color: var(--text-main);
  font-size: 0.85rem;
  font-weight: 600;
  padding: 6px 14px;
  border: 1px solid var(--line-window);
  background: #fff;
  border-radius: 3px;
  transition: all 0.2s ease;
}

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

.btn-nav-start {
  text-decoration: none;
  background: var(--line-window);
  color: #fff !important;
  font-size: 0.85rem;
  font-weight: 600;
  padding: 6px 16px;
  border: 1px solid var(--line-window);
  border-radius: 3px;
  box-shadow: 2px 2px 0px rgba(0, 0, 0, 0.15);
  transition: all 0.2s ease;
}

.btn-nav-start:hover {
  background: #1e293b;
  transform: translateY(-1px);
}

/* 主内容包裹 */
.main-wrapper {
  max-width: 1360px;
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
}

/* ==========================================================================
   首屏：状态标签、标题、一句说明、一条提问框
   核心特色：窗套窗 (最内输入 qwen -> 中层会话 千问网页版 -> 外层 通义千问)
   ========================================================================== */
.hero-section {
  text-align: center;
  padding: 1.5rem 0 3.5rem;
  border-bottom: 1px solid var(--line-subtle);
  margin-bottom: 3.5rem;
}

.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 4px 14px;
  border: 1px solid var(--line-window);
  background: #FFFFFF;
  box-shadow: 2px 2px 0px rgba(51, 65, 85, 0.12);
  border-radius: 3px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-body);
  margin-bottom: 1.5rem;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #10B981;
  display: inline-block;
}

.page-h1-heading {
  font-size: 2.15rem;
  font-weight: 800;
  color: var(--text-main);
  letter-spacing: 0.5px;
  line-height: 1.35;
  margin-bottom: 0.8rem;
}

.hero-motto-statement {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-main);
  display: inline-block;
  padding: 4px 20px;
  border-top: 1px dashed var(--line-window);
  border-bottom: 1px dashed var(--line-window);
  letter-spacing: 2px;
  margin-bottom: 1.2rem;
}

.hero-paragraph-desc {
  max-width: 840px;
  margin: 0 auto 2.5rem;
  font-size: 1.05rem;
  color: var(--text-muted);
  line-height: 1.8;
}

/* ==========================================================================
   窗套窗核心三层结构 (Nested Triple-Window Architecture)
   - 外层：通义千问 (Site Level Window)
   - 中层：千问网页版 (Chat Session Level Window)
   - 内层：qwen (Input / Query Level Window)
   - 细线窗框 1px solid，实色不透明，标题栏等宽小字
   ========================================================================== */
.window-outer {
  max-width: 1040px;
  margin: 0 auto 2rem;
  background: #FFFFFF;
  border: 1px solid var(--line-window);
  border-radius: 4px;
  box-shadow: var(--shadow-window-deep);
  text-align: left;
  overflow: hidden;
}

/* 窗体标题栏公用规范 */
.window-titlebar {
  background: var(--bg-window-bar);
  border-bottom: 1px solid var(--line-window);
  padding: 6px 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
}

.window-titlebar-left {
  display: flex;
  align-items: center;
  gap: 8px;
}

.window-controls {
  display: flex;
  gap: 5px;
}

.win-btn {
  width: 10px;
  height: 10px;
  border: 1px solid var(--line-window);
  background: #FFFFFF;
  border-radius: 2px;
  display: inline-block;
}

.win-btn.close { background: #F87171; }
.win-btn.min { background: #FBBF24; }
.win-btn.max { background: #34D399; }

.window-title-mono {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-main);
  font-weight: 600;
  letter-spacing: 1px;
}

.window-titlebar-right {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
}

/* 外层窗体内容区（容纳中层） */
.window-outer-content {
  padding: 1.5rem;
  background: #F8FAFC;
}

/* 中层窗口：千问网页版 */
.window-mid {
  background: #FFFFFF;
  border: 1px solid var(--line-window);
  border-radius: 3px;
  box-shadow: var(--shadow-window);
  overflow: hidden;
}

.window-mid-content {
  padding: 1.25rem;
  background: #FFFFFF;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

/* 中层会话气泡 */
.chat-stream-box {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.chat-bubble {
  padding: 0.85rem 1.1rem;
  border-radius: 4px;
  font-size: 0.92rem;
  line-height: 1.7;
  max-width: 88%;
}

.chat-bubble-user {
  align-self: flex-end;
  background: #1E293B;
  color: #FFFFFF;
  border: 1px solid var(--line-window);
}

.chat-bubble-ai {
  align-self: flex-start;
  background: #F8FAFC;
  color: var(--text-main);
  border: 1px solid var(--line-subtle);
}

/* 最内层窗口：qwen（提问与输入框） */
.window-inner {
  margin-top: 0.75rem;
  background: #FFFFFF;
  border: 1px solid var(--line-window);
  border-radius: 3px;
  overflow: hidden;
  box-shadow: 2px 2px 0px rgba(51, 65, 85, 0.1);
}

.window-inner-content {
  padding: 0.85rem;
  background: #FFFFFF;
  display: flex;
  gap: 10px;
  align-items: center;
}

.hero-query-input {
  flex-grow: 1;
  padding: 10px 14px;
  border: 1px solid var(--line-subtle);
  border-radius: 3px;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  color: var(--text-main);
  outline: none;
  background: #F8FAFC;
}

.hero-query-input:focus {
  border-color: var(--color-accent);
  background: #FFFFFF;
}

.hero-query-btn {
  padding: 10px 22px;
  background: var(--line-window);
  color: #FFFFFF;
  border: 1px solid var(--line-window);
  border-radius: 3px;
  font-size: 0.92rem;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.2s ease;
}

.hero-query-btn:hover {
  background: var(--color-accent);
  border-color: var(--color-accent);
}

.hero-tag-pills {
  display: flex;
  gap: 10px;
  justify-content: center;
  flex-wrap: wrap;
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-top: 1rem;
}

.hero-tag-pills span {
  padding: 3px 10px;
  border: 1px solid var(--line-subtle);
  background: #FFFFFF;
  border-radius: 2px;
}

/* ==========================================================================
   信任：客户名和四个数字
   ========================================================================== */
.trust-section {
  padding: 1.5rem 0 3.5rem;
  border-bottom: 1px solid var(--line-subtle);
  margin-bottom: 3.5rem;
}

.clients-bar {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 2rem;
  flex-wrap: wrap;
  margin-bottom: 2rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px dashed var(--line-subtle);
}

.client-name-item {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-body);
  border: 1px solid var(--line-subtle);
  background: #FFFFFF;
  padding: 6px 18px;
  border-radius: 3px;
}

.stats-grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.25rem;
  text-align: center;
}

.stat-item-box {
  background: #FFFFFF;
  border: 1px solid var(--line-window);
  border-radius: 3px;
  padding: 1.5rem 1rem;
  box-shadow: var(--shadow-window);
}

.stat-number {
  font-family: var(--font-mono);
  font-size: 2.3rem;
  font-weight: 800;
  color: var(--text-main);
  line-height: 1.1;
  margin-bottom: 0.35rem;
}

.stat-label {
  font-size: 0.88rem;
  color: var(--text-muted);
}

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

.section-tag-mono {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 1.5px;
  color: var(--text-muted);
  border: 1px solid var(--line-subtle);
  background: #FFFFFF;
  padding: 2px 10px;
  border-radius: 2px;
  margin-bottom: 0.5rem;
  text-transform: uppercase;
}

.section-main-title {
  font-size: 2rem;
  font-weight: 800;
  color: var(--text-main);
  letter-spacing: 0.5px;
}

.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 {
  background: #FFFFFF;
  border: 1px solid var(--line-window);
  border-radius: 3px;
  padding: 1.6rem 1.2rem;
  box-shadow: var(--shadow-window);
  transition: transform 0.2s ease;
}

.cap-card:hover {
  transform: translateY(-3px);
  border-color: var(--color-accent);
}

.cap-icon {
  font-size: 1.8rem;
  margin-bottom: 0.8rem;
  display: inline-block;
}

.cap-card h3 {
  font-size: 1.12rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 0.5rem;
}

.cap-card p {
  font-size: 0.86rem;
  color: var(--text-body);
  line-height: 1.6;
}

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

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

.catalog-group-title {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 1.25rem;
  padding-left: 10px;
  border-left: 3px solid var(--line-window);
}

.catalog-grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.catalog-card {
  background: #FFFFFF;
  border: 1px solid var(--line-window);
  border-radius: 3px;
  padding: 1.5rem;
  box-shadow: var(--shadow-window);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.catalog-card-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.75rem;
}

.catalog-state-badge {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 2px 8px;
  border-radius: 2px;
  background: #F1F5F9;
  border: 1px solid var(--line-subtle);
  color: var(--text-body);
}

.catalog-card h4 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.catalog-card p {
  font-size: 0.88rem;
  color: var(--text-muted);
  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(--line-window);
  color: #fff;
  font-size: 0.86rem;
  font-weight: 600;
  padding: 8px 0;
  border: 1px solid var(--line-window);
  border-radius: 2px;
}

.btn-catalog-doc {
  flex: 1;
  text-align: center;
  text-decoration: none;
  background: #FFFFFF;
  color: var(--text-main);
  font-size: 0.86rem;
  font-weight: 600;
  padding: 8px 0;
  border: 1px solid var(--line-window);
  border-radius: 2px;
}

.btn-catalog-try:hover { background: #1e293b; }
.btn-catalog-doc:hover { background: var(--bg-window-bar); }

/* ==========================================================================
   场景：3 列 × 2 行
   ========================================================================== */
.scenarios-grid-3x2 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(2, auto);
  gap: 1.25rem;
  margin-bottom: 4rem;
}

.scenario-card-box {
  background: #FFFFFF;
  border: 1px solid var(--line-window);
  border-radius: 3px;
  padding: 1.25rem;
  box-shadow: var(--shadow-window);
}

.scenario-img-wrap {
  width: 100%;
  height: 170px;
  overflow: hidden;
  border: 1px solid var(--line-subtle);
  border-radius: 2px;
  margin-bottom: 1rem;
  background: #F8FAFC;
  display: flex;
  align-items: center;
  justify-content: center;
}

.scenario-img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.scenario-card-box h4 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 0.4rem;
}

.scenario-card-box p {
  font-size: 0.86rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ==========================================================================
   演示：左边任务，右边结果
   ========================================================================== */
.demo-section-box {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border: 1px solid var(--line-window);
  border-radius: 4px;
  box-shadow: var(--shadow-window-deep);
  margin-bottom: 4rem;
  background: #FFFFFF;
  overflow: hidden;
}

.demo-task-side {
  padding: 2.2rem 2rem;
  border-right: 1px solid var(--line-window);
  background: #F8FAFC;
}

.demo-task-side h3 {
  font-size: 1.3rem;
  font-weight: 700;
  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: 0.92rem;
}

.step-num {
  font-family: var(--font-mono);
  font-weight: 700;
  border: 1px solid var(--line-window);
  width: 24px;
  height: 24px;
  border-radius: 2px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #fff;
  flex-shrink: 0;
}

.demo-result-side {
  padding: 2.2rem 2rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  background: #FFFFFF;
}

.demo-result-side h3 {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 1.2rem;
}

.result-output-box {
  background: #0F172A;
  color: #F8FAFC;
  padding: 1.5rem;
  font-family: var(--font-mono);
  font-size: 0.86rem;
  line-height: 1.7;
  border-radius: 3px;
  border: 1px solid var(--line-window);
  margin-bottom: 1.5rem;
}

/* ==========================================================================
   开发者：左边卖点，右边可切换的代码
   ========================================================================== */
.dev-section-box {
  display: grid;
  grid-template-columns: 1fr 1.25fr;
  border: 1px solid var(--line-window);
  border-radius: 4px;
  box-shadow: var(--shadow-window-deep);
  margin-bottom: 4rem;
  background: #FFFFFF;
  overflow: hidden;
}

.dev-pitch-side {
  padding: 2.2rem 2rem;
  border-right: 1px solid var(--line-window);
}

.dev-pitch-side h3 {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 1.2rem;
}

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

.dev-pitch-item h4 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 0.3rem;
  color: var(--text-main);
}

.dev-pitch-item p {
  font-size: 0.86rem;
  color: var(--text-muted);
}

.dev-code-side {
  background: #0F172A;
  color: #fff;
  display: flex;
  flex-direction: column;
}

.code-tabs-bar {
  display: flex;
  border-bottom: 1px solid #334155;
  background: #1E293B;
}

.code-tab-btn {
  background: transparent;
  color: #94A3B8;
  border: none;
  padding: 10px 18px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  cursor: pointer;
  border-right: 1px solid #334155;
}

.code-tab-btn.active {
  color: #fff;
  background: #0F172A;
  border-bottom: 2px solid var(--color-accent);
}

.code-pre-box {
  padding: 1.6rem;
  font-family: var(--font-mono);
  font-size: 0.84rem;
  line-height: 1.75;
  overflow-x: auto;
  color: #E2E8F0;
}

/* ==========================================================================
   企业：3 列 × 2 行
   ========================================================================== */
.enterprise-grid-3x2 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(2, auto);
  gap: 1.25rem;
  margin-bottom: 4rem;
}

.enterprise-card {
  background: #FFFFFF;
  border: 1px solid var(--line-window);
  border-radius: 3px;
  padding: 1.6rem 1.4rem;
  box-shadow: var(--shadow-window);
  transition: transform 0.2s ease;
}

.enterprise-card:hover {
  transform: translateY(-2px);
  border-color: var(--color-accent);
}

.enterprise-card h4 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.enterprise-card p {
  font-size: 0.86rem;
  color: var(--text-muted);
  line-height: 1.6;
}

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

.col5-title {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  text-align: center;
}

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

.col5-card {
  background: #FFFFFF;
  border: 1px solid var(--line-window);
  border-radius: 3px;
  padding: 1.4rem 1rem;
  text-align: center;
  box-shadow: var(--shadow-window);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.col5-icon {
  font-size: 1.75rem;
  margin-bottom: 0.75rem;
}

.col5-card h4 {
  font-size: 0.98rem;
  font-weight: 700;
  margin-bottom: 0.35rem;
}

.col5-card p {
  font-size: 0.8rem;
  color: var(--text-muted);
  line-height: 1.5;
  margin-bottom: 1.2rem;
  flex-grow: 1;
}

.btn-col5 {
  display: block;
  text-decoration: none;
  background: var(--line-window);
  color: #fff;
  font-size: 0.82rem;
  font-weight: 600;
  padding: 6px 0;
  border-radius: 2px;
}

.btn-col5:hover { background: #1e293b; }

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

.faq-details-item {
  background: #FFFFFF;
  border: 1px solid var(--line-window);
  border-radius: 3px;
  margin-bottom: 1rem;
  box-shadow: 2px 2px 0px rgba(51, 65, 85, 0.08);
}

.faq-summary {
  padding: 1.15rem 1.4rem;
  font-size: 1.05rem;
  font-weight: 700;
  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: 1.3rem;
  font-weight: bold;
}

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

.faq-body-steps {
  padding: 0 1.4rem 1.4rem;
  border-top: 1px dashed var(--line-subtle);
  font-size: 0.92rem;
  color: var(--text-body);
  line-height: 1.8;
}

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

.faq-steps-list li {
  margin-bottom: 0.35rem;
}

/* ==========================================================================
   页脚：品牌说明加四列链接
   ========================================================================== */
.site-footer {
  background: #0F172A;
  color: #CBD5E1;
  padding: 3.5rem 1.5rem 2rem;
  border-top: 3px solid var(--line-window);
}

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

.footer-grid-brand-4cols {
  display: grid;
  grid-template-columns: 1.6fr repeat(4, 1fr);
  gap: 2.2rem;
  margin-bottom: 2.5rem;
}

.footer-brand-side h3 {
  font-size: 1.35rem;
  font-weight: 700;
  color: #FFFFFF;
  margin-bottom: 0.85rem;
  letter-spacing: 1px;
}

.footer-brand-side p {
  font-size: 0.86rem;
  color: #94A3B8;
  line-height: 1.8;
  max-width: 380px;
}

.footer-link-col h4 {
  font-size: 0.92rem;
  font-weight: 700;
  color: #FFFFFF;
  letter-spacing: 1px;
  margin-bottom: 1rem;
  text-transform: uppercase;
  border-bottom: 1px solid #334155;
  padding-bottom: 0.4rem;
}

.footer-link-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}

.footer-link-col ul li a {
  color: #94A3B8;
  text-decoration: none;
  font-size: 0.85rem;
  transition: color 0.2s ease;
}

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

.footer-bottom-bar {
  border-top: 1px solid #1E293B;
  padding-top: 1.5rem;
  text-align: center;
  font-size: 0.82rem;
  color: #64748B;
}

/* 响应式调整 */
@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: 1px solid var(--line-window); }
  .footer-grid-brand-4cols { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .nav-menu { display: none; }
  .page-h1-heading { font-size: 1.6rem; }
  .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; }
}