/* ==========================================================================
   通义千问 QWEN - 【粗条遮字风】发布会主KV视觉系统
   规范：
   - 风格：遮挡构图（黑条是构图，不是审查；不要多条遮挡，单条极粗黑横条）
   - 视觉：纯正黑白高反差（High Contrast Black & White），边缘极致锋利锐利
   - 字体：特黑体（Heavy Black / Impact / Arial Black / Heavy Sans）
   - 被挡字符：「千问」，黑条上反白显示等宽/无衬线「qwen」
   - 场景：发布会主KV（Key Vision），大气硬朗、先锋现代、张力十足
   ========================================================================== */

:root {
  --kv-black: #000000;
  --kv-white: #ffffff;
  --kv-gray-100: #f4f4f5;
  --kv-gray-200: #e4e4e7;
  --kv-gray-300: #d4d4d8;
  --kv-gray-500: #71717a;
  --kv-gray-800: #18181b;
  --kv-gray-900: #09090b;

  --font-heavy: "Impact", "Arial Black", -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Heiti SC", "Source Han Sans CN", sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, Courier, monospace;
  --font-base: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  background-color: var(--kv-white);
  color: var(--kv-black);
}

body {
  font-family: var(--font-base);
  color: var(--kv-black);
  background-color: var(--kv-white);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

.layout-container {
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 24px;
}

/* --------------------------------------------------------------------------
   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(255, 255, 255, 0.96);
  backdrop-filter: blur(8px);
  border-bottom: 2px solid var(--kv-black);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
  gap: 16px;
}

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

.brand-logo {
  width: 36px;
  height: 36px;
  object-fit: contain;
  display: block;
}

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

.brand-title {
  font-family: var(--font-heavy);
  font-size: 1.35rem;
  font-weight: 900;
  letter-spacing: 0.04em;
  line-height: 1.1;
  text-transform: uppercase;
}

.brand-subtitle {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  color: var(--kv-gray-500);
  text-transform: uppercase;
}

.nav-anchors {
  display: flex;
  align-items: center;
  gap: 22px;
  list-style: none;
}

.nav-link {
  font-family: var(--font-base);
  font-size: 0.94rem;
  font-weight: 600;
  color: var(--kv-gray-800);
  text-decoration: none;
  position: relative;
  padding: 6px 0;
  transition: color 0.15s ease;
}

.nav-link:hover {
  color: var(--kv-black);
}

.nav-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--kv-black);
  transition: width 0.2s ease;
}

.nav-link:hover::after {
  width: 100%;
}

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

.btn-header-login {
  font-family: var(--font-mono);
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--kv-black);
  text-decoration: none;
  padding: 8px 18px;
  border: 2px solid var(--kv-black);
  background: transparent;
  transition: all 0.15s ease;
}

.btn-header-login:hover {
  background: var(--kv-gray-100);
}

.btn-header-primary {
  font-family: var(--font-mono);
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--kv-white);
  background: var(--kv-black);
  text-decoration: none;
  padding: 8px 20px;
  border: 2px solid var(--kv-black);
  transition: all 0.15s ease;
}

.btn-header-primary:hover {
  background: var(--kv-gray-800);
  border-color: var(--kv-gray-800);
}

/* --------------------------------------------------------------------------
   发布会主KV核心视觉：「粗条遮字」
   巨幅特黑体「千问」，中间单条极粗黑横条挡住中部，黑条上反白写「qwen」
-------------------------------------------------------------------------- */
.hero-kv-section {
  padding: 56px 0 64px;
  background: var(--kv-white);
  border-bottom: 2px solid var(--kv-black);
  position: relative;
}

.hero-status-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
  border-bottom: 1px solid var(--kv-gray-200);
  padding-bottom: 12px;
}

.hero-status-tag {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  background: var(--kv-black);
  color: var(--kv-white);
  padding: 4px 10px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.hero-status-tag::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  background: #22c55e;
  border-radius: 50%;
}

.hero-kv-spec {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--kv-gray-500);
}

/* 遮挡主KV构图容器 */
.kv-occlusion-container {
  position: relative;
  width: 100%;
  margin: 20px 0 36px;
  user-select: none;
  overflow: hidden;
  text-align: center;
}

/* 底层特黑体字：巨大的「千问」 */
.kv-giant-text {
  font-family: var(--font-heavy);
  font-size: clamp(5.5rem, 16vw, 13rem);
  font-weight: 900;
  color: var(--kv-black);
  line-height: 0.88;
  letter-spacing: clamp(0.02em, 0.05em, 0.1em);
  display: block;
  text-transform: uppercase;
}

/* 粗黑横条：纯黑横贯遮挡文字中部，上下笔画可见 */
.kv-heavy-bar {
  position: absolute;
  top: 50%;
  left: 0;
  width: 100%;
  height: 38%;
  transform: translateY(-50%);
  background-color: var(--kv-black);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2;
  box-shadow: 0 0 0 1px var(--kv-black);
}

/* 黑条上反白显示的「qwen」 */
.kv-heavy-bar-text {
  font-family: var(--font-mono);
  font-size: clamp(2.2rem, 7vw, 5.5rem);
  font-weight: 900;
  color: var(--kv-white);
  letter-spacing: clamp(0.15em, 0.25em, 0.35em);
  text-transform: lowercase;
  line-height: 1;
}

/* 语义化 H1 标题（严格保证与 Title 完全逐字一致） */
.hero-h1-bar {
  margin-top: 24px;
  margin-bottom: 16px;
}

.hero-h1 {
  font-family: var(--font-heavy);
  font-size: clamp(1.4rem, 2.5vw, 2.2rem);
  font-weight: 900;
  line-height: 1.3;
  color: var(--kv-black);
  letter-spacing: -0.01em;
}

.hero-subtitle {
  font-size: 1.1rem;
  color: var(--kv-gray-800);
  max-width: 920px;
  line-height: 1.75;
  margin-bottom: 32px;
}

/* 首屏一条提问框 */
.hero-ask-box {
  display: flex;
  border: 3px solid var(--kv-black);
  background: var(--kv-white);
  box-shadow: 6px 6px 0px var(--kv-black);
  max-width: 860px;
}

.hero-ask-input {
  flex: 1;
  border: none;
  outline: none;
  padding: 18px 24px;
  font-size: 1.05rem;
  font-family: var(--font-base);
  color: var(--kv-black);
  background: transparent;
}

.hero-ask-input::placeholder {
  color: var(--kv-gray-500);
}

.hero-ask-btn {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  font-weight: 700;
  background: var(--kv-black);
  color: var(--kv-white);
  border: none;
  padding: 0 32px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: background 0.15s ease;
}

.hero-ask-btn:hover {
  background: var(--kv-gray-800);
}

/* --------------------------------------------------------------------------
   信任：客户名和四个数字
-------------------------------------------------------------------------- */
.trust-section {
  padding: 48px 0;
  background: var(--kv-gray-100);
  border-bottom: 2px solid var(--kv-black);
}

.trust-clients-label {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--kv-gray-500);
  margin-bottom: 16px;
}

.trust-clients-row {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 36px;
}

.trust-client-badge {
  font-family: var(--font-heavy);
  font-size: 1rem;
  font-weight: 800;
  color: var(--kv-black);
  background: var(--kv-white);
  border: 2px solid var(--kv-black);
  padding: 8px 18px;
}

.trust-stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.trust-stat-box {
  background: var(--kv-white);
  border: 2px solid var(--kv-black);
  padding: 24px;
  box-shadow: 4px 4px 0px var(--kv-black);
}

.trust-stat-val {
  font-family: var(--font-heavy);
  font-size: 2.2rem;
  font-weight: 900;
  color: var(--kv-black);
  line-height: 1.1;
  margin-bottom: 6px;
}

.trust-stat-txt {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--kv-gray-800);
}

/* --------------------------------------------------------------------------
   通用章节头规范
-------------------------------------------------------------------------- */
.section-block {
  padding: 68px 0;
  border-bottom: 2px solid var(--kv-black);
  background: var(--kv-white);
}

.section-head {
  margin-bottom: 44px;
}

.section-tag {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--kv-gray-500);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.section-tag::after {
  content: "";
  flex: 1;
  height: 2px;
  background: var(--kv-black);
  max-width: 60px;
}

.section-h2 {
  font-family: var(--font-heavy);
  font-size: 2rem;
  font-weight: 900;
  color: var(--kv-black);
  line-height: 1.25;
}

.section-h2-desc {
  font-size: 1rem;
  color: var(--kv-gray-500);
  margin-top: 8px;
}

/* --------------------------------------------------------------------------
   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: 20px;
}

.cap-item {
  border: 2px solid var(--kv-black);
  padding: 24px;
  background: var(--kv-white);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.cap-item:hover {
  transform: translate(-3px, -3px);
  box-shadow: 4px 4px 0px var(--kv-black);
}

.cap-ico {
  font-family: var(--font-mono);
  font-size: 1.15rem;
  font-weight: 900;
  background: var(--kv-black);
  color: var(--kv-white);
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
}

.cap-name {
  font-family: var(--font-heavy);
  font-size: 1.18rem;
  font-weight: 900;
  margin-bottom: 10px;
  color: var(--kv-black);
}

.cap-p1, .cap-p2 {
  font-size: 0.86rem;
  color: var(--kv-gray-800);
  line-height: 1.5;
}

/* --------------------------------------------------------------------------
   目录：两组，每组 3 张卡，带状态和「试用 / 文档」
-------------------------------------------------------------------------- */
.catalog-group-title {
  font-family: var(--font-heavy);
  font-size: 1.28rem;
  font-weight: 900;
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.catalog-cards-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-bottom: 40px;
}

.catalog-card {
  border: 2px solid var(--kv-black);
  padding: 24px;
  background: var(--kv-white);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

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

.catalog-card-title {
  font-family: var(--font-heavy);
  font-size: 1.15rem;
  font-weight: 900;
  color: var(--kv-black);
}

.catalog-status {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  font-weight: 700;
  padding: 2px 8px;
  border: 1px solid var(--kv-black);
  background: var(--kv-gray-100);
}

.catalog-status-live {
  background: var(--kv-black);
  color: var(--kv-white);
}

.catalog-card-body {
  font-size: 0.9rem;
  color: var(--kv-gray-800);
  line-height: 1.6;
  margin-bottom: 24px;
}

.catalog-card-actions {
  display: flex;
  gap: 12px;
}

.btn-try {
  font-family: var(--font-mono);
  font-size: 0.86rem;
  font-weight: 700;
  background: var(--kv-black);
  color: var(--kv-white);
  text-decoration: none;
  padding: 8px 18px;
  border: 2px solid var(--kv-black);
}

.btn-try:hover {
  background: var(--kv-gray-800);
}

.btn-doc {
  font-family: var(--font-mono);
  font-size: 0.86rem;
  font-weight: 700;
  color: var(--kv-black);
  background: var(--kv-white);
  text-decoration: none;
  padding: 8px 18px;
  border: 2px solid var(--kv-black);
}

.btn-doc:hover {
  background: var(--kv-gray-100);
}

/* --------------------------------------------------------------------------
   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: 24px;
}

.scene-card {
  border: 2px solid var(--kv-black);
  background: var(--kv-white);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.scene-img-holder {
  width: 100%;
  height: 180px;
  border-bottom: 2px solid var(--kv-black);
  overflow: hidden;
  background: var(--kv-gray-100);
  position: relative;
}

.scene-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.scene-badge {
  position: absolute;
  bottom: 8px;
  right: 8px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  background: var(--kv-black);
  color: var(--kv-white);
  padding: 2px 8px;
}

.scene-info {
  padding: 22px;
  flex: 1;
}

.scene-title {
  font-family: var(--font-heavy);
  font-size: 1.2rem;
  font-weight: 900;
  color: var(--kv-black);
  margin-bottom: 8px;
}

.scene-desc {
  font-size: 0.88rem;
  color: var(--kv-gray-800);
  line-height: 1.6;
}

/* --------------------------------------------------------------------------
   演示：左边任务，右边结果
-------------------------------------------------------------------------- */
.demo-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.demo-panel {
  border: 2px solid var(--kv-black);
  padding: 26px;
  background: var(--kv-white);
  box-shadow: 4px 4px 0px var(--kv-black);
}

.demo-panel-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 2px solid var(--kv-black);
  padding-bottom: 14px;
  margin-bottom: 18px;
}

.demo-panel-title {
  font-family: var(--font-heavy);
  font-size: 1.15rem;
  font-weight: 900;
}

.demo-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  background: var(--kv-black);
  color: var(--kv-white);
  padding: 2px 8px;
}

.demo-input-box {
  background: var(--kv-gray-100);
  border: 1px solid var(--kv-gray-300);
  padding: 16px;
  font-size: 0.94rem;
  line-height: 1.7;
}

.demo-output-box {
  background: var(--kv-gray-900);
  color: var(--kv-white);
  padding: 18px;
  font-family: var(--font-mono);
  font-size: 0.86rem;
  line-height: 1.65;
  white-space: pre-wrap;
}

/* --------------------------------------------------------------------------
   开发者：左边卖点，右边可切换的代码
-------------------------------------------------------------------------- */
.dev-grid {
  display: grid;
  grid-template-columns: 4.8fr 7.2fr;
  gap: 28px;
}

.dev-points {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.dev-point-card {
  border: 2px solid var(--kv-black);
  padding: 20px;
  background: var(--kv-white);
}

.dev-point-title {
  font-family: var(--font-heavy);
  font-size: 1.15rem;
  font-weight: 900;
  margin-bottom: 6px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.dev-point-desc {
  font-size: 0.88rem;
  color: var(--kv-gray-800);
  line-height: 1.6;
}

.dev-code-dock {
  border: 2px solid var(--kv-black);
  background: var(--kv-black);
  color: var(--kv-white);
  box-shadow: 4px 4px 0px var(--kv-gray-500);
}

.code-nav {
  display: flex;
  border-bottom: 1px solid var(--kv-gray-800);
  background: var(--kv-gray-900);
}

.code-tab-btn {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--kv-gray-500);
  background: transparent;
  border: none;
  padding: 12px 20px;
  cursor: pointer;
  border-bottom: 2px solid transparent;
}

.code-tab-btn.active {
  color: var(--kv-white);
  border-bottom-color: var(--kv-white);
  background: var(--kv-black);
}

.code-view {
  padding: 22px;
  font-family: var(--font-mono);
  font-size: 0.86rem;
  line-height: 1.7;
  overflow-x: auto;
  color: #e4e4e7;
}

/* --------------------------------------------------------------------------
   企业：3 列 × 2 行
-------------------------------------------------------------------------- */
.ent-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.ent-card {
  border: 2px solid var(--kv-black);
  padding: 26px;
  background: var(--kv-white);
  box-shadow: 3px 3px 0px var(--kv-black);
}

.ent-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--kv-gray-500);
  text-transform: uppercase;
  margin-bottom: 8px;
}

.ent-title {
  font-family: var(--font-heavy);
  font-size: 1.2rem;
  font-weight: 900;
  color: var(--kv-black);
  margin-bottom: 8px;
}

.ent-desc {
  font-size: 0.88rem;
  color: var(--kv-gray-800);
  line-height: 1.65;
}

/* --------------------------------------------------------------------------
   下载和帮助：各 5 列
-------------------------------------------------------------------------- */
.five-col-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
  margin-bottom: 36px;
}

.five-card {
  border: 2px solid var(--kv-black);
  padding: 20px 16px;
  background: var(--kv-white);
  text-decoration: none;
  color: var(--kv-black);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all 0.15s ease;
}

.five-card:hover {
  background: var(--kv-black);
  color: var(--kv-white);
}

.five-card:hover .five-sub,
.five-card:hover .five-desc {
  color: var(--kv-gray-200);
}

.five-title {
  font-family: var(--font-heavy);
  font-size: 1.05rem;
  font-weight: 900;
  margin-bottom: 4px;
}

.five-sub {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  font-weight: 700;
  color: var(--kv-gray-500);
  margin-bottom: 12px;
}

.five-desc {
  font-size: 0.84rem;
  color: var(--kv-gray-800);
  line-height: 1.5;
}

/* --------------------------------------------------------------------------
   问答：默认折叠，点开才看步骤
-------------------------------------------------------------------------- */
.faq-box-wrap {
  display: flex;
  flex-direction: column;
  gap: 16px;
  max-width: 980px;
  margin: 0 auto;
}

.faq-detail {
  border: 2px solid var(--kv-black);
  background: var(--kv-white);
}

.faq-detail[open] {
  box-shadow: 4px 4px 0px var(--kv-black);
}

.faq-head {
  list-style: none;
  padding: 20px 24px;
  font-family: var(--font-heavy);
  font-size: 1.1rem;
  font-weight: 900;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  user-select: none;
}

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

.faq-head::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
}

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

.faq-body {
  padding: 0 24px 24px;
  border-top: 1px solid var(--kv-black);
  padding-top: 18px;
  font-size: 0.94rem;
  color: var(--kv-gray-800);
  line-height: 1.7;
}

.faq-step-list {
  list-style: none;
  margin-top: 12px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.faq-step-list li {
  position: relative;
  padding-left: 26px;
}

.faq-step-list li::before {
  content: "■";
  position: absolute;
  left: 0;
  top: 1px;
  font-size: 0.75rem;
  color: var(--kv-black);
}

/* --------------------------------------------------------------------------
   页脚：品牌说明加四列链接
-------------------------------------------------------------------------- */
.site-footer {
  background: var(--kv-black);
  color: var(--kv-white);
  padding: 60px 0 36px;
}

.footer-top {
  display: grid;
  grid-template-columns: 4fr repeat(4, 2fr);
  gap: 36px;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--kv-gray-800);
}

.footer-brand-title {
  font-family: var(--font-heavy);
  font-size: 1.5rem;
  font-weight: 900;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.footer-brand-p {
  font-size: 0.88rem;
  color: var(--kv-gray-300);
  line-height: 1.7;
  margin-top: 14px;
}

.footer-col-h {
  font-family: var(--font-heavy);
  font-size: 1.05rem;
  font-weight: 900;
  margin-bottom: 16px;
  color: var(--kv-white);
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-a {
  text-decoration: none;
  font-size: 0.88rem;
  color: var(--kv-gray-300);
  transition: color 0.15s ease;
}

.footer-a:hover {
  color: var(--kv-white);
  text-decoration: underline;
}

.footer-bottom {
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--kv-gray-500);
}

/* --------------------------------------------------------------------------
   网页版与帮助中心通用工作台
-------------------------------------------------------------------------- */
.app-stage-wrap {
  display: grid;
  grid-template-columns: 280px 1fr;
  min-height: calc(100vh - 68px);
  border-top: 2px solid var(--kv-black);
}

.app-side {
  border-right: 2px solid var(--kv-black);
  background: var(--kv-gray-100);
  padding: 24px 20px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.app-chat-main {
  display: flex;
  flex-direction: column;
  background: var(--kv-white);
}

.app-chat-stream {
  flex: 1;
  padding: 36px 48px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.chat-bubble-occl {
  max-width: 860px;
  border: 2px solid var(--kv-black);
  padding: 22px;
  background: var(--kv-white);
  position: relative;
}

.chat-bubble-occl.assistant {
  border-left: 8px solid var(--kv-black);
}

.chat-bubble-occl.user {
  align-self: flex-end;
  background: var(--kv-gray-100);
}

.chat-dock-bar {
  border-top: 2px solid var(--kv-black);
  padding: 20px 48px 28px;
  background: var(--kv-white);
}

/* 响应式适配 */
@media (max-width: 1024px) {
  .caps-grid,
  .trust-stats-grid,
  .scenes-grid,
  .ent-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .five-col-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .demo-grid,
  .dev-grid {
    grid-template-columns: 1fr;
  }
  .footer-top {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .nav-anchors {
    display: none;
  }
  .caps-grid,
  .trust-stats-grid,
  .catalog-cards-row,
  .scenes-grid,
  .ent-grid,
  .five-col-grid {
    grid-template-columns: 1fr;
  }
  .footer-top {
    grid-template-columns: 1fr;
  }
  .app-stage-wrap {
    grid-template-columns: 1fr;
  }
  .app-side {
    display: none;
  }
  .app-chat-stream,
  .chat-dock-bar {
    padding-left: 16px;
    padding-right: 16px;
  }
}