/* ==========================================================================
   Kimi AI - 脚注密集版专属样式表 (Footnote-Dense Style)
   规范要求：
   - 风格：脚注比正文更重要，正文只有两行
   - 布局：正文在顶，分隔线，下面脚注占百分之七十
   - 骨架：两行正文含标题、分隔线、六条脚注
   - 颜色：纸 #FFFFFF，正文 #111111，线 #111111，脚注 #3A3A3A，脚注号 #8E2F2F
   - 执行：视觉重量在脚注区
   - 宽度 1100px 居中，系统/中文黑体，顶栏 sticky，严禁横向溢出
   ========================================================================== */

:root {
  --color-paper: #FFFFFF;
  --color-bg-subtle: #F9F9F8;
  --color-body: #111111;
  --color-line: #111111;
  --color-line-subtle: rgba(17, 17, 17, 0.12);
  --color-footnote: #3A3A3A;
  --color-footnote-num: #8E2F2F;
  --color-footnote-num-bg: rgba(142, 47, 47, 0.08);
  --color-accent: #8E2F2F;
  --color-accent-hover: #732424;
  --color-card-bg: #FFFFFF;
  --color-dark-card: #151515;
  --color-dark-card-text: #E5E5E5;
  --font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --container-width: 1100px;
}

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

body {
  background-color: var(--color-paper);
  color: var(--color-body);
  font-family: var(--font-family);
  font-size: 15px;
  line-height: 1.68;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* 顶部极小关键词横条 */
.micro-bar {
  background-color: #111111;
  color: #888888;
  font-size: 11px;
  letter-spacing: 0.8px;
  padding: 5px 0;
  text-align: center;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}
.micro-bar span {
  display: inline-block;
  opacity: 0.85;
}

/* 容器居中 */
.container {
  width: 100%;
  max-width: var(--container-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

/* 1. Header 顶栏 sticky */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(8px);
  border-bottom: 2px solid var(--color-line);
  padding: 14px 0;
}

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

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 17px;
  font-weight: 700;
  color: var(--color-body);
  text-decoration: none;
  letter-spacing: -0.2px;
}

.brand-badge {
  background-color: var(--color-line);
  color: #FFFFFF;
  font-size: 11px;
  padding: 2px 7px;
  border-radius: 2px;
  font-weight: 600;
  letter-spacing: 0.5px;
}

.site-nav {
  display: flex;
  gap: 20px;
  align-items: center;
}

.site-nav a {
  color: var(--color-footnote);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  transition: color 0.15s ease;
  position: relative;
  padding: 4px 0;
}

.site-nav a:hover,
.site-nav a.active {
  color: var(--color-accent);
}

.site-nav a.active::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background-color: var(--color-accent);
}

/* 2. Hero 左右栏：主打脚注密集视觉 */
.hero-section {
  padding: 48px 0 36px 0;
  background-color: var(--color-paper);
  border-bottom: 1px solid var(--color-line-subtle);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: stretch;
}

.hero-left {
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.h1-wrap {
  margin-bottom: 16px;
}

.h1-product {
  font-size: 14px;
  font-weight: 700;
  color: var(--color-accent);
  letter-spacing: 1.5px;
  text-transform: uppercase;
  margin-bottom: 6px;
  display: inline-block;
}

.h1-angle {
  font-size: 32px;
  font-weight: 800;
  color: var(--color-body);
  line-height: 1.25;
  letter-spacing: -0.5px;
}

.hero-lead {
  font-size: 15px;
  color: var(--color-footnote);
  line-height: 1.7;
  margin-bottom: 24px;
}

.hero-actions {
  display: flex;
  gap: 12px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 22px;
  font-size: 14px;
  font-weight: 600;
  border-radius: 4px;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.2s ease;
  min-height: 44px;
}

.btn-primary {
  background-color: var(--color-line);
  color: #FFFFFF;
  border: 1px solid var(--color-line);
}

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

.btn-secondary {
  background-color: #FFFFFF;
  color: var(--color-body);
  border: 1px solid var(--color-line);
}

.btn-secondary:hover {
  background-color: var(--color-bg-subtle);
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.capsule-group {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
}

.capsule {
  font-size: 12px;
  color: var(--color-footnote);
  background-color: var(--color-bg-subtle);
  border: 1px solid var(--color-line-subtle);
  padding: 4px 10px;
  border-radius: 3px;
  font-weight: 500;
}

.hero-meta {
  font-size: 12px;
  color: #777777;
}

/* 右侧核心视觉：脚注密集专有骨架 (正文两行在顶，粗实线，70%占比较大脚注区) */
.hero-right {
  display: flex;
  align-items: center;
}

.footnote-dense-frame {
  width: 100%;
  background-color: #FFFFFF;
  border: 2px solid var(--color-line);
  border-radius: 4px;
  box-shadow: 4px 4px 0px rgba(17, 17, 17, 0.08);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.dense-top-text {
  padding: 20px 24px 16px 24px;
  background-color: #FFFFFF;
}

.dense-header-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
}

.dense-doc-tag {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 1px;
  color: var(--color-accent);
  border-bottom: 1px solid var(--color-accent);
  padding-bottom: 2px;
}

.dense-doc-ver {
  font-size: 11px;
  color: #888888;
}

.dense-title {
  font-size: 17px;
  font-weight: 800;
  color: var(--color-body);
  margin-bottom: 8px;
  letter-spacing: -0.2px;
}

.dense-two-lines {
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--color-body);
  font-weight: 500;
}

/* 脚注标号高亮样式 */
.fn-ref {
  color: var(--color-footnote-num);
  font-weight: 700;
  font-size: 11px;
  vertical-align: super;
  margin: 0 1px;
  cursor: default;
}

/* 粗分隔线：正文与脚注明确划分 */
.dense-divider {
  height: 2px;
  background-color: var(--color-line);
  width: 100%;
  margin: 0;
  position: relative;
}

.dense-divider-label {
  position: absolute;
  right: 16px;
  top: -9px;
  background-color: #FFFFFF;
  padding: 0 6px;
  font-size: 10px;
  font-weight: 700;
  color: var(--color-accent);
  letter-spacing: 0.5px;
}

/* 下面脚注占百分之七十视觉重量 */
.dense-footnote-body {
  padding: 18px 24px 20px 24px;
  background-color: var(--color-bg-subtle);
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.fn-item {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  font-size: 12.5px;
  line-height: 1.55;
  color: var(--color-footnote);
}

.fn-num {
  font-size: 11px;
  font-weight: 800;
  color: var(--color-footnote-num);
  background-color: var(--color-footnote-num-bg);
  padding: 1px 5px;
  border-radius: 2px;
  min-width: 22px;
  text-align: center;
  flex-shrink: 0;
  margin-top: 1px;
}

.fn-content {
  flex: 1;
}

.fn-content strong {
  color: var(--color-body);
  font-weight: 600;
}

/* 通用区块排版 */
.content-section {
  padding: 56px 0;
  border-bottom: 1px solid var(--color-line-subtle);
}

.section-head {
  margin-bottom: 32px;
}

.section-title {
  font-size: 24px;
  font-weight: 800;
  color: var(--color-body);
  letter-spacing: -0.3px;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.section-title::before {
  content: "";
  display: inline-block;
  width: 4px;
  height: 20px;
  background-color: var(--color-accent);
  border-radius: 1px;
}

.section-subtitle {
  font-size: 14px;
  color: var(--color-footnote);
}

/* 3. 特色区块 (Features) */
.features-stack {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 24px;
}

.feature-strip {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 24px;
  padding: 18px 22px;
  background-color: #FFFFFF;
  border: 1px solid var(--color-line-subtle);
  border-left: 3px solid var(--color-line);
  border-radius: 3px;
  transition: all 0.2s ease;
}

.feature-strip:hover {
  border-left-color: var(--color-accent);
  box-shadow: 0 4px 12px rgba(0,0,0,0.04);
}

.feature-strip-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--color-body);
  display: flex;
  align-items: center;
  gap: 6px;
}

.feature-strip-desc {
  font-size: 13.5px;
  color: var(--color-footnote);
  line-height: 1.6;
}

.feature-extra-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-top: 20px;
}

.feature-extra-card {
  background-color: #FFFFFF;
  border: 1px solid var(--color-line-subtle);
  border-radius: 4px;
  padding: 20px;
  display: flex;
  flex-direction: column;
}

.feature-extra-card img {
  width: 100%;
  height: 190px;
  object-fit: cover;
  border-radius: 3px;
  border: 1px solid var(--color-line-subtle);
  margin-bottom: 14px;
}

.feature-extra-card h3 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--color-body);
}

.feature-extra-card p {
  font-size: 13px;
  color: var(--color-footnote);
  line-height: 1.6;
}

/* 4. 步骤区块 (Steps) */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.step-card {
  background-color: #FFFFFF;
  border: 1px solid var(--color-line-subtle);
  border-top: 3px solid var(--color-line);
  border-radius: 4px;
  padding: 20px;
  position: relative;
  transition: all 0.2s ease;
}

.step-card:hover {
  border-top-color: var(--color-accent);
  box-shadow: 0 4px 12px rgba(0,0,0,0.05);
}

.step-seq {
  font-size: 12px;
  font-weight: 800;
  color: var(--color-accent);
  letter-spacing: 1px;
  margin-bottom: 8px;
  display: block;
}

.step-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--color-body);
  margin-bottom: 8px;
}

.step-desc {
  font-size: 13px;
  color: var(--color-footnote);
  line-height: 1.6;
}

/* 5. 对照清单区块 (Checklist) */
.checklist-card {
  background-color: var(--color-dark-card);
  color: var(--color-dark-card-text);
  border: 1px solid #333333;
  border-radius: 4px;
  padding: 28px;
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.2);
}

.checklist-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid #333333;
  padding-bottom: 14px;
  margin-bottom: 20px;
}

.checklist-header h3 {
  font-size: 18px;
  font-weight: 700;
  color: #FFFFFF;
}

.checklist-tag {
  background-color: var(--color-accent);
  color: #FFFFFF;
  font-size: 11px;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 2px;
  letter-spacing: 0.5px;
}

.checklist-table {
  width: 100%;
  border-collapse: collapse;
}

.checklist-table th,
.checklist-table td {
  padding: 12px 14px;
  text-align: left;
  border-bottom: 1px solid #292929;
  font-size: 13.5px;
}

.checklist-table th {
  color: #888888;
  font-weight: 600;
  font-size: 12px;
  letter-spacing: 0.5px;
}

.checklist-table tr:hover td {
  background-color: rgba(255, 255, 255, 0.02);
}

.checklist-table td strong {
  color: #FFFFFF;
}

/* 6. 场景区块 (Scenes) */
.scenes-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.scene-card {
  background-color: #FFFFFF;
  border: 1px solid var(--color-line-subtle);
  border-radius: 4px;
  padding: 22px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.scene-persona {
  display: flex;
  align-items: center;
  gap: 10px;
}

.scene-role {
  font-size: 14px;
  font-weight: 700;
  color: var(--color-body);
}

.scene-quote {
  font-size: 13.5px;
  color: var(--color-footnote);
  line-height: 1.6;
  font-style: italic;
  border-left: 2px solid var(--color-accent);
  padding-left: 12px;
}

.scene-action {
  font-size: 12.5px;
  color: var(--color-body);
  font-weight: 600;
  background-color: var(--color-bg-subtle);
  padding: 8px 12px;
  border-radius: 3px;
}

/* 7. 小技巧区块 (Tips) - 3列短卡 */
.tips-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.tip-card {
  background-color: #FFFFFF;
  border: 1px solid var(--color-line-subtle);
  border-radius: 4px;
  padding: 20px;
}

.tip-num {
  font-size: 11px;
  font-weight: 800;
  color: var(--color-accent);
  letter-spacing: 1px;
  display: block;
  margin-bottom: 6px;
}

.tip-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--color-body);
  margin-bottom: 8px;
}

.tip-desc {
  font-size: 13px;
  color: var(--color-footnote);
  line-height: 1.6;
}

/* 8. 卡点笔记区块 (Blockers) */
.blocker-stack {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.blocker-item {
  background-color: #FFFFFF;
  border: 1px solid var(--color-line-subtle);
  border-radius: 4px;
  padding: 20px;
}

.blocker-symptom {
  font-size: 14.5px;
  font-weight: 700;
  color: var(--color-accent);
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.blocker-solution {
  font-size: 13.5px;
  color: var(--color-footnote);
  line-height: 1.65;
  padding-left: 24px;
}

.blocker-solution ol {
  margin-top: 6px;
  padding-left: 16px;
}

.blocker-solution li {
  margin-bottom: 4px;
}

/* 9. FAQ 手风琴 */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.faq-item {
  background-color: #FFFFFF;
  border: 1px solid var(--color-line-subtle);
  border-radius: 4px;
  overflow: hidden;
  transition: all 0.2s ease;
}

.faq-item summary {
  padding: 16px 20px;
  font-size: 14.5px;
  font-weight: 700;
  color: var(--color-body);
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  user-select: none;
}

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

.faq-item summary::after {
  content: "+";
  font-size: 18px;
  font-weight: 400;
  color: var(--color-footnote);
  transition: transform 0.2s ease;
}

.faq-item[open] summary::after {
  transform: rotate(45deg);
  color: var(--color-accent);
}

.faq-item[open] {
  border-color: var(--color-line);
}

.faq-content {
  padding: 0 20px 16px 20px;
  font-size: 13.5px;
  color: var(--color-footnote);
  line-height: 1.65;
  border-top: 1px dashed var(--color-line-subtle);
  padding-top: 14px;
}

/* 10. 资讯区块 (News) */
.news-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.news-card {
  background-color: #FFFFFF;
  border: 1px solid var(--color-line-subtle);
  padding: 14px 18px;
  border-radius: 3px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  text-decoration: none;
  transition: all 0.15s ease;
}

.news-card:hover {
  border-color: var(--color-accent);
  background-color: var(--color-bg-subtle);
}

.news-title {
  font-size: 13.5px;
  font-weight: 600;
  color: var(--color-body);
  flex: 1;
  padding-right: 12px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.news-date {
  font-size: 12px;
  color: #888888;
  font-family: monospace;
}

.news-footer-time {
  margin-top: 16px;
  text-align: right;
  font-size: 12px;
  color: #777777;
}

/* 11. 收尾 CTA */
.cta-box {
  background-color: var(--color-line);
  color: #FFFFFF;
  border-radius: 4px;
  padding: 36px 40px;
  text-align: center;
  margin: 48px 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
}

.cta-title {
  font-size: 22px;
  font-weight: 800;
}

.cta-desc {
  font-size: 14px;
  color: #CCCCCC;
  max-width: 600px;
  line-height: 1.6;
}

.cta-box .btn {
  background-color: #FFFFFF;
  color: var(--color-body);
  border: 1px solid #FFFFFF;
  margin-top: 8px;
}

.cta-box .btn:hover {
  background-color: var(--color-accent);
  border-color: var(--color-accent);
  color: #FFFFFF;
}

/* 12. Footer */
.site-footer {
  background-color: #FAFAFA;
  border-top: 2px solid var(--color-line);
  padding: 48px 0 24px 0;
  font-size: 13px;
  color: var(--color-footnote);
}

.footer-top {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 36px;
  margin-bottom: 36px;
}

.footer-brand h4 {
  font-size: 16px;
  font-weight: 800;
  color: var(--color-body);
  margin-bottom: 10px;
}

.footer-brand p {
  line-height: 1.65;
  color: var(--color-footnote);
  font-size: 12.5px;
}

.footer-col h5 {
  font-size: 13.5px;
  font-weight: 700;
  color: var(--color-body);
  margin-bottom: 12px;
}

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

.footer-links a {
  color: var(--color-footnote);
  text-decoration: none;
  transition: color 0.15s ease;
  font-size: 12.5px;
}

.footer-links a:hover {
  color: var(--color-accent);
}

.footer-bottom {
  border-top: 1px solid var(--color-line-subtle);
  padding-top: 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
  color: #888888;
  flex-wrap: wrap;
  gap: 10px;
}

/* 响应式断点规范：<900px 双栏变单栏；<640px 缩小标题 */
@media (max-width: 900px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }
  .feature-strip {
    grid-template-columns: 1fr;
    gap: 8px;
  }
  .feature-extra-grid,
  .scenes-grid,
  .news-grid,
  .footer-top {
    grid-template-columns: 1fr;
  }
  .steps-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .tips-grid {
    grid-template-columns: 1fr;
  }
  .checklist-table {
    display: block;
    overflow-x: auto;
  }
}

@media (max-width: 640px) {
  .h1-angle {
    font-size: 24px;
  }
  .section-title {
    font-size: 20px;
  }
  .steps-grid {
    grid-template-columns: 1fr;
  }
  .micro-bar {
    gap: 8px;
    font-size: 10px;
  }
  .site-nav {
    gap: 10px;
    flex-wrap: wrap;
  }
  .cta-box {
    padding: 24px 16px;
  }
}
/* online-perf: skip offscreen sections, keep images inside the column */
section {
  content-visibility: auto;
  contain-intrinsic-size: auto 640px;
}
img {
  max-width: 100%;
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
  }
}