/* ==========================================================================
   千问 - 对称破一处 · 镜像风 (MIRROR ASYMMETRY BREAK STYLE)
   核心美学：
   - 纯粹黑白高对比与工业极简度
   - 严格左右物理镜像对称，极细虚线对称轴，轴旁标印「通义千问」
   - 字体：无衬线大写 (SANS-SERIF UPPERCASE)
   - 镜像的核心词：QWEN；被挪开的词是「千问」，且只在右下角破坏一个字的位置（只允许一处不对称）
   ========================================================================== */

:root {
  --color-bg: #ffffff;
  --color-bg-alt: #f9f9f9;
  --color-bg-pure-black: #000000;
  --color-text-main: #0a0a0a;
  --color-text-muted: #555555;
  --color-text-light: #888888;
  --color-text-inverse: #ffffff;
  
  --color-border: #e0e0e0;
  --color-border-dark: #000000;
  --color-axis-dashed: #000000;
  
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, Courier, monospace;

  --container-max: 1200px;
  --border-radius: 0px; /* 极简黑白秩序，锐角直边 */
}

/* 基础重置 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-sans);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  background-color: var(--color-bg);
  color: var(--color-text-main);
  overflow-x: hidden;
}

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

ul, ol {
  list-style: none;
}

button, input, select, textarea {
  font: inherit;
}

.layout-container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

/* ==========================================================================
   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-color: rgba(255, 255, 255, 0.98);
  border-bottom: 1px solid var(--color-border-dark);
}

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

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

.brand-logo-frame {
  width: 32px;
  height: 32px;
  border: 1px solid var(--color-border-dark);
  display: flex;
  align-items: center;
  justify-content: center;
  background: #fff;
}

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

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

.brand-title {
  font-size: 1rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  color: var(--color-text-main);
  text-transform: uppercase;
}

.brand-sub {
  font-size: 0.65rem;
  letter-spacing: 0.12em;
  color: var(--color-text-muted);
  text-transform: uppercase;
  font-family: var(--font-mono);
}

/* 七个锚点 */
.nav-anchors {
  display: flex;
  align-items: center;
  gap: 20px;
}

.nav-link {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-text-main);
  letter-spacing: 0.05em;
  padding: 4px 0;
  position: relative;
  transition: color 0.2s ease;
}

.nav-link:hover {
  color: #000;
  text-decoration: underline;
}

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

.btn-header-login {
  font-size: 0.85rem;
  font-weight: 700;
  padding: 8px 16px;
  border: 1px solid var(--color-border-dark);
  background: transparent;
  color: var(--color-text-main);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  transition: all 0.2s ease;
}

.btn-header-login:hover {
  background: #f0f0f0;
}

.btn-header-primary {
  font-size: 0.85rem;
  font-weight: 700;
  padding: 8px 18px;
  background: var(--color-bg-pure-black);
  color: var(--color-text-inverse);
  border: 1px solid var(--color-border-dark);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  transition: all 0.2s ease;
}

.btn-header-primary:hover {
  background: #333333;
}

/* ==========================================================================
   2. 首屏：状态标签、标题、一句说明、一条提问框 +【对称破一处 · 镜像主视觉舞台】
   ========================================================================== */
.hero-section {
  padding: 48px 0 64px 0;
  border-bottom: 1px solid var(--color-border-dark);
  background: #ffffff;
}

.hero-status-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
  padding-bottom: 12px;
  border-bottom: 1px dashed var(--color-border);
  font-family: var(--font-mono);
  font-size: 0.75rem;
}

.hero-status-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.hero-spec-tag {
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.hero-title-box {
  margin-bottom: 16px;
}

.hero-h1 {
  font-size: 2.2rem;
  font-weight: 900;
  line-height: 1.25;
  letter-spacing: -0.02em;
  color: var(--color-text-main);
  word-break: break-word;
}

.hero-desc {
  font-size: 1.05rem;
  line-height: 1.7;
  color: var(--color-text-muted);
  max-width: 960px;
  margin-bottom: 28px;
}

/* 一条提问框 */
.hero-search-box {
  border: 2px solid var(--color-border-dark);
  background: #ffffff;
  padding: 6px;
  margin-bottom: 48px;
}

.hero-search-form {
  display: flex;
  align-items: center;
  gap: 12px;
}

.hero-search-input {
  flex: 1;
  border: none;
  padding: 12px 16px;
  font-size: 0.95rem;
  color: var(--color-text-main);
  outline: none;
  background: transparent;
}

.hero-search-input::placeholder {
  color: #999999;
}

.hero-search-btn {
  background: var(--color-bg-pure-black);
  color: var(--color-text-inverse);
  border: 1px solid var(--color-border-dark);
  padding: 12px 24px;
  font-size: 0.9rem;
  font-weight: 700;
  cursor: pointer;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  transition: background 0.2s ease;
}

.hero-search-btn:hover {
  background: #222222;
}

/* ==========================================================================
   【对称破一处 · 镜像品牌主视觉核心舞台】
   左右严格镜像，对称轴极细虚线，轴旁小字“通义千问”
   镜像词 QWEN，无衬线大写
   只在右下角破坏一个字的位置，挪开的词是「千问」
   ========================================================================== */
.mirror-visual-stage {
  border: 1px solid var(--color-border-dark);
  background: #fafafa;
  position: relative;
  padding: 32px 24px;
  margin-top: 24px;
}

.mirror-stage-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 12px;
  margin-bottom: 24px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

/* 镜像舞台主体网格：左右等宽，中间贯穿极细虚线轴 */
.mirror-split-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  position: relative;
  min-height: 280px;
}

/* 对称轴极细虚线 */
.mirror-axis-line {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  width: 0;
  border-left: 1px dashed var(--color-axis-dashed);
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10;
}

/* 轴旁小字：通义千问 */
.mirror-axis-label {
  position: absolute;
  top: 50%;
  left: 8px;
  transform: translateY(-50%);
  white-space: nowrap;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.3em;
  color: #000000;
  writing-mode: vertical-rl;
  text-orientation: mixed;
  background: #fafafa;
  padding: 8px 2px;
  border: 1px solid var(--color-border);
}

/* 左侧机能区：严格镜像左翼 */
.mirror-wing-left {
  padding: 24px 32px 24px 16px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  text-align: right;
  border-right: none;
}

/* 右侧机能区：严格镜像右翼 */
.mirror-wing-right {
  padding: 24px 16px 24px 32px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  text-align: left;
  border-left: none;
}

/* 上部镜像元信息 */
.wing-meta {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--color-text-muted);
  text-transform: uppercase;
}

/* 核心镜像词：QWEN (无衬线大写) */
.mirror-word-qwen {
  font-size: 4.8rem;
  font-weight: 900;
  letter-spacing: 0.12em;
  line-height: 1;
  text-transform: uppercase;
  color: #000000;
  margin: 16px 0;
  font-family: var(--font-sans);
}

/* 右侧镜像翻转呈现严谨物理镜像 */
.mirror-word-qwen.reflected {
  display: inline-block;
  transform: scaleX(-1);
  transform-origin: left center;
}

/* 底部区域：左边正常在位，右边破坏对称挪开 */
.wing-bottom {
  display: flex;
  align-items: center;
  min-height: 48px;
}

.mirror-wing-left .wing-bottom {
  justify-content: flex-end;
}

.mirror-wing-right .wing-bottom {
  justify-content: flex-start;
  position: relative;
}

/* 左侧严格对齐的基准元素 */
.baseline-anchor-box {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  border: 1px solid var(--color-border-dark);
  padding: 6px 14px;
  background: #ffffff;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

/* 右下角唯一的破对称点：被挪开的词「千问」 */
.asymmetry-broken-point {
  position: absolute;
  /* 挪离原本严格对称的位置 */
  left: 36px;
  top: 14px;
  transform: rotate(4.5deg);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: #000000;
  color: #ffffff;
  padding: 8px 18px;
  border: 2px solid #000000;
  box-shadow: 4px 4px 0px rgba(0, 0, 0, 0.2);
  z-index: 20;
}

.asymmetry-broken-point .broken-word {
  font-size: 1.15rem;
  font-weight: 900;
  letter-spacing: 0.18em;
  color: #ffffff;
}

.asymmetry-broken-point .broken-tag {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.1em;
  background: #333333;
  padding: 2px 6px;
  text-transform: uppercase;
}

/* 舞台底部注记 */
.mirror-stage-footer {
  margin-top: 24px;
  padding-top: 12px;
  border-top: 1px dashed var(--color-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--color-text-light);
  letter-spacing: 0.08em;
}

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

.trust-clients-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-text-light);
  margin-bottom: 16px;
}

.trust-clients-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 12px;
  margin-bottom: 36px;
}

.trust-client-item {
  border: 1px solid var(--color-border);
  padding: 12px 8px;
  text-align: center;
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  background: #fcfcfc;
  color: var(--color-text-main);
}

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

.trust-number-card {
  border: 1px solid var(--color-border-dark);
  padding: 20px;
  background: #ffffff;
}

.trust-number-val {
  font-size: 2.2rem;
  font-weight: 900;
  font-family: var(--font-mono);
  line-height: 1.1;
  margin-bottom: 4px;
  color: var(--color-text-main);
}

.trust-number-label {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-text-main);
  margin-bottom: 4px;
}

.trust-number-desc {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  line-height: 1.4;
}

/* ==========================================================================
   4. 能力：4 列 × 2 行，只有图标、标题和两行字
   ========================================================================== */
.capabilities-section {
  padding: 64px 0;
  background: #fafafa;
  border-bottom: 1px solid var(--color-border-dark);
}

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

.section-tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-text-light);
  margin-bottom: 8px;
}

.section-h2 {
  font-size: 1.6rem;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--color-text-main);
}

.cap-grid-4x2 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.cap-card-item {
  border: 1px solid var(--color-border-dark);
  background: #ffffff;
  padding: 20px;
  display: flex;
  flex-direction: column;
}

.cap-icon-box {
  width: 40px;
  height: 40px;
  border: 1px solid var(--color-border-dark);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  font-weight: 800;
  margin-bottom: 16px;
  background: #f4f4f4;
  font-family: var(--font-mono);
}

.cap-card-title {
  font-size: 1rem;
  font-weight: 800;
  margin-bottom: 8px;
  color: var(--color-text-main);
}

.cap-line-1, .cap-line-2 {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  line-height: 1.4;
}

/* ==========================================================================
   5. 目录：两组，每组 3 张卡，带状态和「试用 / 文档」
   ========================================================================== */
.catalog-section {
  padding: 64px 0;
  background: #ffffff;
  border-bottom: 1px solid var(--color-border-dark);
}

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

.catalog-group-wrapper:last-child {
  margin-bottom: 0;
}

.catalog-group-title {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 800;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-border-dark);
}

.catalog-cards-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.catalog-card {
  border: 1px solid var(--color-border-dark);
  padding: 24px;
  background: #fafafa;
  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-h3 {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--color-text-main);
}

.catalog-status-badge {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 700;
  padding: 2px 8px;
  border: 1px solid var(--color-border-dark);
  background: #ffffff;
  text-transform: uppercase;
}

.catalog-card-desc {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  line-height: 1.5;
  margin-bottom: 20px;
  min-height: 48px;
}

.catalog-card-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  border-top: 1px dashed var(--color-border);
  padding-top: 16px;
}

.btn-catalog-try {
  font-size: 0.8rem;
  font-weight: 700;
  padding: 6px 16px;
  background: var(--color-bg-pure-black);
  color: var(--color-text-inverse);
  border: 1px solid var(--color-border-dark);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

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

.btn-catalog-doc {
  font-size: 0.8rem;
  font-weight: 700;
  padding: 6px 16px;
  background: #ffffff;
  color: var(--color-text-main);
  border: 1px solid var(--color-border-dark);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.btn-catalog-doc:hover {
  background: #f0f0f0;
}

/* ==========================================================================
   6. 场景：3 列 × 2 行（合理插入 1.webp-4.webp）
   ========================================================================== */
.scenes-section {
  padding: 64px 0;
  background: #fafafa;
  border-bottom: 1px solid var(--color-border-dark);
}

.scenes-grid-3x2 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

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

.scene-image-wrapper {
  width: 100%;
  height: 180px;
  border-bottom: 1px solid var(--color-border-dark);
  background: #000000;
  position: relative;
  overflow: hidden;
}

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

.scene-card:hover .scene-img {
  filter: grayscale(20%);
}

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

.scene-tag {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  color: var(--color-text-light);
  text-transform: uppercase;
  margin-bottom: 8px;
}

.scene-title {
  font-size: 1.05rem;
  font-weight: 800;
  margin-bottom: 8px;
  color: var(--color-text-main);
}

.scene-desc {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  line-height: 1.5;
}

/* ==========================================================================
   7. 演示：左边任务，右边结果
   ========================================================================== */
.demo-section {
  padding: 64px 0;
  background: #ffffff;
  border-bottom: 1px solid var(--color-border-dark);
}

.demo-split-box {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border: 1px solid var(--color-border-dark);
  background: #ffffff;
}

.demo-col-task {
  padding: 32px;
  border-right: 1px solid var(--color-border-dark);
  background: #fafafa;
}

.demo-col-result {
  padding: 32px;
  background: #ffffff;
}

.demo-pane-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 1px dashed var(--color-border-dark);
}

.demo-pane-title {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.demo-pane-badge {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  padding: 2px 8px;
  border: 1px solid var(--color-border-dark);
  background: #ffffff;
  text-transform: uppercase;
}

.demo-task-prompt {
  background: #ffffff;
  border: 1px solid var(--color-border);
  padding: 20px;
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--color-text-main);
  margin-bottom: 20px;
}

.demo-task-meta {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

.demo-result-content {
  background: #fdfdfd;
  border: 1px solid var(--color-border);
  padding: 20px;
  font-size: 0.88rem;
  line-height: 1.6;
}

.demo-result-content h4 {
  font-size: 0.95rem;
  font-weight: 800;
  margin: 12px 0 6px 0;
}

.demo-result-content h4:first-child {
  margin-top: 0;
}

.demo-result-content ul {
  padding-left: 20px;
  list-style: disc;
  margin-bottom: 12px;
}

.demo-result-content li {
  margin-bottom: 4px;
}

/* ==========================================================================
   8. 开发者：左边卖点，右边可切换的代码
   ========================================================================== */
.dev-section {
  padding: 64px 0;
  background: #fafafa;
  border-bottom: 1px solid var(--color-border-dark);
}

.dev-split-box {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border: 1px solid var(--color-border-dark);
  background: #ffffff;
}

.dev-left-selling {
  padding: 36px;
  border-right: 1px solid var(--color-border-dark);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.dev-sell-item {
  margin-bottom: 24px;
}

.dev-sell-item:last-child {
  margin-bottom: 0;
}

.dev-sell-title {
  font-size: 1.05rem;
  font-weight: 800;
  margin-bottom: 8px;
  color: var(--color-text-main);
}

.dev-sell-desc {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  line-height: 1.5;
}

.dev-right-code {
  padding: 36px;
  background: #000000;
  color: #ffffff;
  display: flex;
  flex-direction: column;
}

.dev-code-tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 20px;
  border-bottom: 1px solid #333333;
  padding-bottom: 12px;
}

.btn-code-tab {
  background: transparent;
  color: #888888;
  border: 1px solid #333333;
  padding: 6px 14px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  cursor: pointer;
  text-transform: uppercase;
}

.btn-code-tab.active {
  background: #ffffff;
  color: #000000;
  border-color: #ffffff;
}

.code-display-block {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  line-height: 1.5;
  background: #111111;
  border: 1px solid #222222;
  padding: 16px;
  overflow-x: auto;
  color: #e0e0e0;
  flex: 1;
}

/* ==========================================================================
   9. 企业：3 列 × 2 行
   ========================================================================== */
.enterprise-section {
  padding: 64px 0;
  background: #ffffff;
  border-bottom: 1px solid var(--color-border-dark);
}

.ent-grid-3x2 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.ent-card {
  border: 1px solid var(--color-border-dark);
  padding: 24px;
  background: #fafafa;
}

.ent-card-num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.15em;
  color: var(--color-text-light);
  margin-bottom: 12px;
}

.ent-card-title {
  font-size: 1.1rem;
  font-weight: 800;
  margin-bottom: 8px;
  color: var(--color-text-main);
}

.ent-card-desc {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  line-height: 1.5;
}

/* ==========================================================================
   10. 下载和帮助：各 5 列
   ========================================================================== */
.download-help-section {
  padding: 64px 0;
  background: #fafafa;
  border-bottom: 1px solid var(--color-border-dark);
}

.grid-5-cols {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
}

.dl-card, .help-guide-card {
  border: 1px solid var(--color-border-dark);
  background: #ffffff;
  padding: 20px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.dl-platform-name, .help-guide-title {
  font-size: 0.95rem;
  font-weight: 800;
  margin-bottom: 6px;
  color: var(--color-text-main);
}

.dl-platform-spec, .help-guide-spec {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--color-text-light);
  margin-bottom: 12px;
  text-transform: uppercase;
}

.dl-platform-desc, .help-guide-desc {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  line-height: 1.4;
  margin-bottom: 16px;
  min-height: 48px;
}

.btn-card-action {
  font-size: 0.75rem;
  font-weight: 700;
  padding: 6px 12px;
  border: 1px solid var(--color-border-dark);
  background: #ffffff;
  color: var(--color-text-main);
  text-align: center;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  transition: all 0.2s ease;
}

.btn-card-action:hover {
  background: #000000;
  color: #ffffff;
}

/* ==========================================================================
   11. 问答：默认折叠，点开才看步骤
   ========================================================================== */
.faq-section {
  padding: 64px 0;
  background: #ffffff;
  border-bottom: 1px solid var(--color-border-dark);
}

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

.faq-item {
  border: 1px solid var(--color-border-dark);
  background: #fafafa;
}

.faq-summary {
  padding: 18px 24px;
  font-size: 1rem;
  font-weight: 800;
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  user-select: none;
  outline: none;
}

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

.faq-summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 1.2rem;
  font-weight: 800;
  transition: transform 0.2s ease;
}

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

.faq-item[open] .faq-summary {
  border-bottom: 1px dashed var(--color-border-dark);
  background: #ffffff;
}

.faq-steps-body {
  padding: 24px;
  background: #ffffff;
  font-size: 0.88rem;
  line-height: 1.6;
}

.faq-steps-list {
  padding-left: 20px;
  list-style: decimal;
  margin-top: 12px;
}

.faq-steps-list li {
  margin-bottom: 8px;
}

/* ==========================================================================
   12. 页脚：品牌说明加四列链接
   ========================================================================== */
.site-footer {
  background: #000000;
  color: #ffffff;
  padding: 64px 0 48px 0;
}

.footer-top-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr 1.5fr;
  gap: 32px;
  margin-bottom: 48px;
  padding-bottom: 36px;
  border-bottom: 1px solid #222222;
}

.footer-brand-col {
  padding-right: 24px;
}

.footer-brand-title {
  font-size: 1.1rem;
  font-weight: 900;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 12px;
}

.footer-brand-desc {
  font-size: 0.8rem;
  color: #888888;
  line-height: 1.6;
}

.footer-col-title {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: #ffffff;
  margin-bottom: 16px;
  border-bottom: 1px dashed #333333;
  padding-bottom: 6px;
}

.footer-links-list li {
  margin-bottom: 10px;
}

.footer-links-list a {
  font-size: 0.8rem;
  color: #aaaaaa;
  transition: color 0.2s ease;
}

.footer-links-list a:hover {
  color: #ffffff;
  text-decoration: underline;
}

.footer-bottom-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: #666666;
  letter-spacing: 0.05em;
}

/* 响应式调整 */
@media (max-width: 1024px) {
  .cap-grid-4x2 {
    grid-template-columns: repeat(2, 1fr);
  }
  .grid-5-cols {
    grid-template-columns: repeat(3, 1fr);
  }
  .footer-top-grid {
    grid-template-columns: 1fr 1fr;
  }
  .mirror-word-qwen {
    font-size: 3.5rem;
  }
}

@media (max-width: 768px) {
  .catalog-cards-grid,
  .scenes-grid-3x2,
  .ent-grid-3x2,
  .demo-split-box,
  .dev-split-box {
    grid-template-columns: 1fr;
  }
  .trust-clients-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .trust-numbers-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .grid-5-cols {
    grid-template-columns: 1fr;
  }
  .mirror-word-qwen {
    font-size: 2.4rem;
  }
  .footer-top-grid {
    grid-template-columns: 1fr;
  }
}