/* ==========================================================================
   千问AI平台 ·【胶片叠层风 (FILM OVERLAY STACK)】
   风格特性：
   - 风格：叠片 (Film Layers Overlay)
   - 场景：能力介绍 (Capabilities Showcase)
   - 布局：三张矩形透明胶片各错开 16px 叠在一起，每张只印一种信息
   - 风格说明：叠片：透明，边缘可见，不错成模糊，不要模糊发光
   - 核心三层：
     1. 第一张：只有标题，写「通义千问」，字体宋体，边缘小字 qwen
     2. 第二张：只有列表，写「千问网页版」，纯净功能清单，边缘小字 qwen
     3. 第三张：只有一个入口，写「千问办公」，中心单一大入口，边缘小字 qwen
   ========================================================================== */

:root {
  --bg-primary: #F8F9FA;
  --bg-card: #FFFFFF;
  --text-main: #111111;
  --text-secondary: #444444;
  --text-dim: #777777;
  --text-faint: #999999;
  --border-solid: #111111;
  --border-film: rgba(0, 0, 0, 0.85);
  --border-light: #E2E4E8;
  --film-bg: rgba(255, 255, 255, 0.90);
  --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-serif: "Songti SC", "SimSun", "STSong", "source-han-serif-sc", SimSun, serif;
  --font-mono: "SF Mono", "Cascadia Code", "Fira Code", Consolas, Menlo, monospace;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  background-color: var(--bg-primary);
  color: var(--text-main);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-main);
  line-height: 1.6;
  min-height: 100vh;
}

/* 页面通用布局容器 */
.layout-container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ==========================================================================
   1. 顶栏：标志、七个锚点、登录、开始使用
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(248, 249, 250, 0.96);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border-solid);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  gap: 16px;
}

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

.brand-logo-frame {
  width: 34px;
  height: 34px;
  border: 1px solid var(--border-solid);
  display: flex;
  align-items: center;
  justify-content: center;
  background: #FFFFFF;
}

.brand-logo {
  display: block;
  object-fit: contain;
}

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

.brand-title {
  font-size: 15px;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--text-main);
}

.brand-sub {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--text-dim);
}

.nav-anchors {
  display: flex;
  align-items: center;
  gap: 20px;
  list-style: none;
}

.nav-link {
  text-decoration: none;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  transition: color 0.15s ease;
  position: relative;
  padding: 6px 0;
}

.nav-link:hover, .nav-link.active {
  color: var(--text-main);
}

.nav-link.active::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--text-main);
}

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

.btn-header-login {
  text-decoration: none;
  font-size: 13px;
  font-weight: 700;
  color: var(--text-main);
  padding: 8px 16px;
  border: 1px solid var(--border-solid);
  background: #FFFFFF;
  transition: all 0.15s ease;
}

.btn-header-login:hover {
  background: #ECEFF1;
}

.btn-header-primary {
  text-decoration: none;
  font-size: 13px;
  font-weight: 700;
  color: #FFFFFF;
  background: var(--text-main);
  border: 1px solid var(--border-solid);
  padding: 8px 18px;
  transition: all 0.15s ease;
}

.btn-header-primary:hover {
  background: #2D3748;
}

/* ==========================================================================
   2. 首屏：状态标签、标题、说明、提问框 +【胶片叠层核心舞台】
   ========================================================================== */
.hero-section {
  padding: 40px 0 50px 0;
  border-bottom: 2px solid var(--border-solid);
}

.hero-status-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 18px;
  flex-wrap: wrap;
}

.hero-status-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  padding: 4px 10px;
  border: 1px solid var(--border-solid);
  background: #FFFFFF;
}

.hero-status-badge::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  background: #000000;
  border-radius: 50%;
}

.hero-spec-tag {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-dim);
  border: 1px dashed var(--border-solid);
  padding: 4px 10px;
}

.hero-title-box {
  margin-bottom: 14px;
}

.hero-h1 {
  font-size: clamp(24px, 3.8vw, 36px);
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--text-main);
  line-height: 1.25;
}

.hero-subtitle {
  font-size: 15px;
  line-height: 1.7;
  color: var(--text-secondary);
  max-width: 980px;
  margin-bottom: 24px;
}

.hero-ask-form {
  display: flex;
  max-width: 820px;
  border: 2px solid var(--border-solid);
  background: #FFFFFF;
  box-shadow: 4px 4px 0px rgba(0, 0, 0, 1);
  margin-bottom: 36px;
}

.hero-ask-input {
  flex: 1;
  border: none;
  outline: none;
  padding: 14px 18px;
  font-size: 14px;
  font-family: var(--font-sans);
  background: transparent;
}

.hero-ask-btn {
  border: none;
  border-left: 2px solid var(--border-solid);
  background: #000000;
  color: #FFFFFF;
  padding: 0 24px;
  font-size: 13px;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: background 0.15s ease;
}

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

/* ==========================================================================
   【胶片叠层 (FILM OVERLAY STACK) 核心视觉舞台】
   - 场景：能力介绍
   - 布局：三张矩形透明胶片各错开 16px 叠在一起，每张只印一种信息
   - 风格：透明，边缘可见，不错成模糊，叠区不发糊，不要模糊发光
   - 字体：第一张宋体
   - 三张分别写：通义千问、千问网页版、千问办公，边缘小字 qwen
   ========================================================================== */
.film-stage-box {
  background: #FFFFFF;
  border: 1px solid var(--border-solid);
  padding: 40px 32px 50px 32px;
  position: relative;
  margin-top: 10px;
}

.film-stage-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border-light);
  padding-bottom: 12px;
  margin-bottom: 30px;
}

.film-stage-label {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-dim);
}

.film-stage-hint {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-faint);
}

/* 三层错开 16px 容器 */
.film-stack-container {
  position: relative;
  width: 100%;
  max-width: 980px;
  height: 440px;
  margin: 0 auto;
}

/* 基础胶片共用规范：透明高透，边缘物理线条清晰，叠区不发糊，无模糊发光 */
.film-sheet {
  position: absolute;
  width: calc(100% - 32px);
  height: 380px;
  background: var(--film-bg);
  border: 1.5px solid var(--border-film);
  box-shadow: 2px 2px 0px rgba(0, 0, 0, 0.08);
  padding: 32px 36px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

/* 胶片边缘刻度与角标小字 qwen */
.film-corner-qwen {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.15em;
  color: var(--text-dim);
  text-transform: uppercase;
}

.film-index-no {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  border: 1px solid var(--border-solid);
  padding: 1px 6px;
}

/* ==========================================================================
   第一张胶片 (FILM 01)：
   - 位置：top: 0; left: 0;
   - 规则：只有标题
   - 内容：通义千问
   - 字体：宋体 (Serif)
   ========================================================================== */
.film-sheet-01 {
  top: 0;
  left: 0;
  z-index: 10;
}

.film-01-body {
  margin: auto 0;
}

.film-01-meta-tag {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--text-dim);
  margin-bottom: 8px;
}

.film-01-title {
  font-family: var(--font-serif);
  font-size: clamp(38px, 6vw, 68px);
  font-weight: 900;
  letter-spacing: 0.02em;
  color: #000000;
  line-height: 1.1;
  margin-bottom: 12px;
}

.film-01-sub {
  font-family: var(--font-serif);
  font-size: 16px;
  color: #333333;
  letter-spacing: 0.05em;
}

/* ==========================================================================
   第二张胶片 (FILM 02)：
   - 位置：top: 16px; left: 16px; (错开 16px)
   - 规则：只有列表
   - 内容：千问网页版
   ========================================================================== */
.film-sheet-02 {
  top: 16px;
  left: 16px;
  z-index: 20;
}

.film-02-body {
  margin: auto 0;
}

.film-02-heading {
  font-size: 24px;
  font-weight: 900;
  margin-bottom: 18px;
  color: #000000;
}

.film-02-list {
  list-style: none;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px 28px;
}

.film-02-item {
  font-size: 14px;
  color: #222222;
  display: flex;
  align-items: center;
  gap: 8px;
  border-bottom: 1px dashed var(--border-light);
  padding-bottom: 6px;
}

.film-02-item::before {
  content: "—";
  font-family: var(--font-mono);
  color: var(--text-dim);
}

/* ==========================================================================
   第三张胶片 (FILM 03)：
   - 位置：top: 32px; left: 32px; (再错开 16px)
   - 规则：只有一个入口
   - 内容：千问办公
   ========================================================================== */
.film-sheet-03 {
  top: 32px;
  left: 32px;
  z-index: 30;
}

.film-03-body {
  margin: auto 0;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.film-03-scheme {
  font-size: 26px;
  font-weight: 900;
  letter-spacing: -0.01em;
  margin-bottom: 16px;
}

/* 只有一个大入口 */
.film-03-sole-btn {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  font-size: 16px;
  font-weight: 800;
  padding: 16px 44px;
  background: #000000;
  color: #FFFFFF;
  border: 1.5px solid #000000;
  transition: all 0.15s ease;
}

.film-03-sole-btn:hover {
  background: #2D3748;
}

.film-03-sole-btn span[aria-hidden="true"] {
  font-family: var(--font-mono);
  font-size: 18px;
}

/* 胶片底栏 */
.film-sheet-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid var(--border-light);
  padding-top: 10px;
}

/* ==========================================================================
   3. 信任：客户名和四个数字
   ========================================================================== */
.trust-section {
  padding: 40px 0;
  border-bottom: 1px solid var(--border-solid);
  background: #FFFFFF;
}

.trust-clients-label {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 16px;
}

.trust-clients-list {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 28px;
}

.trust-client-chip {
  padding: 8px 16px;
  border: 1px solid var(--border-solid);
  background: var(--bg-primary);
  font-size: 13px;
  font-weight: 700;
  color: var(--text-main);
}

.trust-stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.trust-stat-card {
  padding: 20px;
  border: 1px solid var(--border-solid);
  background: var(--bg-primary);
}

.trust-stat-num {
  font-family: var(--font-mono);
  font-size: 28px;
  font-weight: 900;
  line-height: 1.1;
  color: #000000;
  margin-bottom: 6px;
}

.trust-stat-label {
  font-size: 12px;
  color: var(--text-dim);
  line-height: 1.5;
}

/* 通用章节容器 */
.section-wrapper {
  padding: 56px 0;
  border-bottom: 1px solid var(--border-solid);
}

.section-head {
  margin-bottom: 36px;
}

.section-label {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 6px;
}

.section-h2 {
  font-size: 26px;
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--text-main);
}

.section-h2-sub {
  font-size: 14px;
  color: var(--text-dim);
  margin-top: 6px;
}

/* ==========================================================================
   4. 能力：4 列 × 2 行，只有图标、标题和两行字
   ========================================================================== */
.caps-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.cap-card {
  background: #FFFFFF;
  border: 1px solid var(--border-solid);
  padding: 24px 20px;
  display: flex;
  flex-direction: column;
}

.cap-icon-box {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 900;
  background: #000000;
  color: #FFFFFF;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
}

.cap-title {
  font-size: 16px;
  font-weight: 800;
  margin-bottom: 10px;
  color: var(--text-main);
}

.cap-line1, .cap-line2 {
  font-size: 13px;
  color: #444444;
  line-height: 1.5;
}

/* ==========================================================================
   5. 目录：两组，每组 3 张卡，带状态和「试用 / 文档」
   ========================================================================== */
.catalog-group-title {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.1em;
  color: var(--text-dim);
  text-transform: uppercase;
  margin: 28px 0 16px 0;
  padding-left: 8px;
  border-left: 3px solid var(--border-solid);
}

.catalog-cards-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-bottom: 24px;
}

.catalog-card {
  background: #FFFFFF;
  border: 1px solid var(--border-solid);
  padding: 22px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.catalog-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}

.catalog-card-title {
  font-size: 16px;
  font-weight: 800;
  color: var(--text-main);
}

.catalog-status-badge {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
  background: #000000;
  color: #FFFFFF;
  padding: 2px 6px;
}

.catalog-card-desc {
  font-size: 13px;
  color: #555555;
  line-height: 1.6;
  margin-bottom: 18px;
}

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

.btn-catalog-try {
  flex: 1;
  text-align: center;
  text-decoration: none;
  font-size: 12px;
  font-weight: 700;
  padding: 8px 0;
  background: #000000;
  color: #FFFFFF;
  border: 1px solid var(--border-solid);
  transition: all 0.15s ease;
}

.btn-catalog-try:hover {
  background: #333333;
}

.btn-catalog-doc {
  flex: 1;
  text-align: center;
  text-decoration: none;
  font-size: 12px;
  font-weight: 700;
  padding: 8px 0;
  background: #FFFFFF;
  color: var(--text-main);
  border: 1px solid var(--border-solid);
  transition: all 0.15s ease;
}

.btn-catalog-doc:hover {
  background: #ECEFF1;
}

/* ==========================================================================
   6. 场景：3 列 × 2 行（合理插入 1.webp-4.webp）
   ========================================================================== */
.scenes-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.scene-card {
  background: #FFFFFF;
  border: 1px solid var(--border-solid);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.scene-img-box {
  width: 100%;
  height: 180px;
  border-bottom: 1px solid var(--border-solid);
  position: relative;
  overflow: hidden;
  background: #F0F0F0;
}

.scene-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.25s ease;
}

.scene-card:hover .scene-img {
  transform: scale(1.03);
}

.scene-img-stamp {
  position: absolute;
  top: 10px;
  right: 10px;
  background: rgba(0, 0, 0, 0.85);
  color: #FFFFFF;
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
  padding: 3px 6px;
}

.scene-content {
  padding: 18px;
  flex: 1;
}

.scene-title {
  font-size: 15px;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 8px;
}

.scene-desc {
  font-size: 13px;
  color: #555555;
  line-height: 1.6;
}

/* ==========================================================================
   7. 演示：左边任务，右边结果
   ========================================================================== */
.demo-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.demo-panel {
  background: #FFFFFF;
  border: 1px solid var(--border-solid);
  padding: 24px;
}

.demo-panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border-solid);
  padding-bottom: 12px;
  margin-bottom: 16px;
}

.demo-panel-title {
  font-size: 14px;
  font-weight: 800;
  letter-spacing: -0.01em;
}

.demo-stamp {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
  background: #000000;
  color: #FFFFFF;
  padding: 2px 6px;
}

.demo-input-card {
  font-size: 13px;
  line-height: 1.7;
  color: #222222;
  background: #FAFAFA;
  padding: 16px;
  border: 1px solid var(--border-light);
}

.demo-output-card {
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.7;
  color: #111111;
  background: #FFFFFF;
  border: 1px solid var(--border-solid);
  padding: 16px;
  white-space: pre-wrap;
  overflow-x: auto;
}

/* ==========================================================================
   8. 开发者：左边卖点，右边可切换的代码
   ========================================================================== */
.dev-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 20px;
}

.dev-points-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.dev-point-item {
  background: #FFFFFF;
  border: 1px solid var(--border-solid);
  padding: 18px;
}

.dev-point-title {
  font-size: 14px;
  font-weight: 800;
  margin-bottom: 6px;
}

.dev-point-desc {
  font-size: 13px;
  color: #555555;
  line-height: 1.6;
}

.dev-code-box {
  background: #FFFFFF;
  border: 1px solid var(--border-solid);
  display: flex;
  flex-direction: column;
}

.code-tabs-nav {
  display: flex;
  border-bottom: 1px solid var(--border-solid);
  background: #F4F4F4;
}

.code-tab-button {
  background: none;
  border: none;
  border-right: 1px solid var(--border-solid);
  padding: 10px 18px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  cursor: pointer;
  color: #666666;
}

.code-tab-button.active {
  background: #FFFFFF;
  color: #000000;
}

.code-view-pre {
  padding: 18px;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
  background: #FFFFFF;
  color: #111111;
  overflow-x: auto;
}

/* ==========================================================================
   9. 企业：3 列 × 2 行
   ========================================================================== */
.ent-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.ent-card {
  background: #FFFFFF;
  border: 1px solid var(--border-solid);
  padding: 22px;
  display: flex;
  flex-direction: column;
}

.ent-badge {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
  color: var(--text-dim);
  margin-bottom: 8px;
}

.ent-title {
  font-size: 15px;
  font-weight: 800;
  margin-bottom: 8px;
}

.ent-desc {
  font-size: 13px;
  color: #555555;
  line-height: 1.6;
}

/* ==========================================================================
   10. 下载和帮助：各 5 列
   ========================================================================== */
.five-col-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 12px;
}

.five-col-item {
  background: #FFFFFF;
  border: 1px solid var(--border-solid);
  padding: 16px 14px;
  text-decoration: none;
  color: var(--text-main);
  display: flex;
  flex-direction: column;
  transition: transform 0.15s ease;
}

.five-col-item:hover {
  transform: translateY(-2px);
  background: #FAFAFA;
}

.five-title {
  font-size: 13px;
  font-weight: 800;
  margin-bottom: 4px;
}

.five-sub {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-dim);
  margin-bottom: 8px;
}

.five-desc {
  font-size: 12px;
  color: #666666;
  line-height: 1.5;
}

/* ==========================================================================
   11. 问答：默认折叠，点开才看步骤
   ========================================================================== */
.faq-wrap {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.faq-detail-block {
  border: 1px solid var(--border-solid);
  background: #FFFFFF;
}

.faq-summary-block {
  padding: 16px 20px;
  font-size: 14px;
  font-weight: 800;
  cursor: pointer;
  background: #FFFFFF;
  list-style: none;
  position: relative;
  padding-right: 40px;
}

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

.faq-summary-block::after {
  content: "+";
  position: absolute;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 700;
}

.faq-detail-block[open] .faq-summary-block::after {
  content: "−";
}

.faq-body-block {
  padding: 0 20px 18px 20px;
  border-top: 1px dashed var(--border-light);
  font-size: 13px;
  line-height: 1.7;
  color: #333333;
}

.faq-steps-ol {
  margin: 10px 0 0 18px;
  padding: 0;
}

.faq-steps-ol li {
  margin-bottom: 6px;
}

/* ==========================================================================
   12. 页脚：品牌说明加四列链接
   ========================================================================== */
.site-footer {
  background: #FFFFFF;
  border-top: 2px solid var(--border-solid);
  padding: 48px 0 32px 0;
}

.footer-top {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr 1fr;
  gap: 28px;
  margin-bottom: 36px;
}

.footer-brand-title {
  font-size: 16px;
  font-weight: 900;
  margin-bottom: 10px;
  letter-spacing: -0.01em;
}

.footer-brand-desc {
  font-size: 12px;
  color: #666666;
  line-height: 1.7;
}

.footer-col-h {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 12px;
  color: var(--text-dim);
}

.footer-links-ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-a {
  text-decoration: none;
  font-size: 13px;
  color: #444444;
  transition: color 0.15s ease;
}

.footer-a:hover {
  color: #000000;
  text-decoration: underline;
}

.footer-bottom {
  border-top: 1px solid var(--border-light);
  padding-top: 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-faint);
  flex-wrap: wrap;
  gap: 10px;
}

/* ==========================================================================
   响应式断点适配
   ========================================================================== */
@media (max-width: 1080px) {
  .caps-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .five-col-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .footer-top {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .nav-anchors {
    display: none;
  }
  .trust-stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .catalog-cards-row {
    grid-template-columns: 1fr;
  }
  .scenes-grid {
    grid-template-columns: 1fr;
  }
  .demo-grid {
    grid-template-columns: 1fr;
  }
  .dev-grid {
    grid-template-columns: 1fr;
  }
  .ent-grid {
    grid-template-columns: 1fr;
  }
  .five-col-grid {
    grid-template-columns: 1fr;
  }
  .footer-top {
    grid-template-columns: 1fr;
  }
  .film-stack-container {
    height: 480px;
  }
  .film-sheet {
    width: calc(100% - 16px);
    height: 420px;
    padding: 20px 16px;
  }
  .film-sheet-02 {
    top: 12px;
    left: 8px;
  }
  .film-sheet-03 {
    top: 24px;
    left: 16px;
  }
  .film-02-list {
    grid-template-columns: 1fr;
    gap: 8px;
  }
}