/* 
  爆炸图｜Kimi API (Exploded Assembly View Style)
  底: #F6F3EC, 零件: #E7E1D6, 边: #1A1A1A, 轴: #8A8175, 序号: #C4372C
  执行：零件沿左下至右上斜轴分布，不重叠，最大零件标题「Kimi API」
*/

:root {
  --bg-main: #F6F3EC;
  --part-bg: #E7E1D6;
  --border-line: #1A1A1A;
  --axis-line: #8A8175;
  --accent-seq: #C4372C;
  --text-main: #1A1A1A;
  --text-muted: #615B52;
  --card-bg: #FFFFFF;
  --max-width: 1100px;
  --font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
  --mono-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, Courier, monospace;
}

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

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

body {
  font-family: var(--font-family);
  color: var(--text-main);
  background-color: var(--bg-main);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* 页眉微字条 */
.micro-bar {
  background-color: #E2DBD0;
  border-bottom: 1px solid var(--border-line);
  padding: 5px 16px;
  font-family: var(--mono-family);
  font-size: 11px;
  color: var(--text-muted);
  letter-spacing: 0.5px;
  white-space: nowrap;
  overflow-x: auto;
  text-align: center;
}
.micro-bar span {
  margin: 0 8px;
  color: var(--text-main);
}

/* 容器居中 */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* Sticky Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(246, 243, 236, 0.96);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border-line);
}

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

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text-main);
  font-weight: 700;
  font-size: 1.15rem;
}

.brand-badge {
  display: inline-block;
  padding: 2px 6px;
  font-size: 10px;
  font-family: var(--mono-family);
  border: 1px solid var(--border-line);
  background: var(--part-bg);
  color: var(--accent-seq);
  font-weight: bold;
}

.site-nav {
  display: flex;
  gap: 18px;
  align-items: center;
}

.site-nav a {
  text-decoration: none;
  color: var(--text-main);
  font-size: 0.9rem;
  font-weight: 500;
  padding: 6px 8px;
  border-bottom: 2px solid transparent;
  transition: all 0.2s ease;
}

.site-nav a:hover,
.site-nav a.active {
  border-bottom: 2px solid var(--accent-seq);
  color: var(--accent-seq);
}

/* 按钮通用规范 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 22px;
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  border-radius: 4px;
  border: 1px solid var(--border-line);
  transition: all 0.2s ease;
  cursor: pointer;
}

.btn-primary {
  background-color: var(--border-line);
  color: #F6F3EC;
}

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

.btn-secondary {
  background-color: var(--part-bg);
  color: var(--text-main);
}

.btn-secondary:hover {
  background-color: #DBD4C7;
  border-color: var(--accent-seq);
}

/* Hero 左右栏 */
.hero-section {
  padding: 48px 0 56px;
  border-bottom: 1px solid var(--border-line);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 36px;
  align-items: stretch;
}

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

.h1-wrap {
  margin-bottom: 20px;
}

.h1-product {
  display: block;
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--accent-seq);
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 6px;
  font-family: var(--mono-family);
}

.h1-angle {
  display: block;
  font-size: 2.15rem;
  font-weight: 800;
  line-height: 1.25;
  color: var(--text-main);
  letter-spacing: -0.5px;
}

.hero-lead {
  font-size: 1.05rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 24px;
}

.hero-actions {
  display: flex;
  gap: 14px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

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

.capsule {
  font-size: 0.78rem;
  padding: 4px 10px;
  border: 1px solid var(--border-line);
  background-color: var(--part-bg);
  color: var(--text-main);
  border-radius: 20px;
  font-family: var(--mono-family);
}

.hero-meta {
  font-size: 0.82rem;
  color: var(--axis-line);
  font-family: var(--mono-family);
}

/* 爆炸图视觉区 (Hero Right) */
.hero-exploded-stage {
  border: 1px solid var(--border-line);
  background-color: #FFFFFF;
  position: relative;
  min-height: 380px;
  padding: 20px;
  overflow: hidden;
  box-shadow: 0 4px 12px rgba(0,0,0,0.03);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

/* 穿透斜轴线 (左下至右上) */
.exploded-axis {
  position: absolute;
  top: 15%;
  right: 8%;
  bottom: 15%;
  left: 8%;
  pointer-events: none;
  z-index: 1;
}

.exploded-axis svg {
  width: 100%;
  height: 100%;
  overflow: visible;
}

/* 五零件沿斜轴分布容器 */
.exploded-assembly {
  position: relative;
  z-index: 2;
  width: 100%;
  height: 100%;
  min-height: 340px;
}

.exploded-part {
  position: absolute;
  background-color: var(--part-bg);
  border: 1px solid var(--border-line);
  box-shadow: 2px 2px 0px rgba(0,0,0,0.15);
  padding: 8px 12px;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.exploded-part:hover {
  transform: scale(1.03);
  border-color: var(--accent-seq);
}

.part-seq {
  font-family: var(--mono-family);
  font-size: 11px;
  font-weight: 900;
  color: var(--accent-seq);
  margin-right: 6px;
}

.part-label {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--text-main);
}

/* 五个具体零件定位（左下到右上，非重叠，最大零件标题） */
.part-1 {
  bottom: 15px;
  left: 15px;
  width: 130px;
}

.part-2 {
  bottom: 85px;
  left: 95px;
  width: 140px;
}

/* 最大零件：位于中心偏右，醒目显示 Kimi API */
.part-3-main {
  top: 42%;
  left: 46%;
  transform: translate(-50%, -50%);
  width: 220px;
  padding: 16px 18px;
  background-color: #E2DBD0;
  border: 2px solid var(--border-line);
  box-shadow: 4px 4px 0px rgba(0,0,0,0.2);
  text-align: center;
}

.part-3-main:hover {
  transform: translate(-50%, -50%) scale(1.03);
  border-color: var(--accent-seq);
}

.part-3-title {
  font-size: 1.35rem;
  font-weight: 900;
  letter-spacing: 0.5px;
  color: var(--text-main);
}

.part-3-sub {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 4px;
  font-family: var(--mono-family);
}

.part-4 {
  top: 85px;
  right: 95px;
  width: 145px;
}

.part-5 {
  top: 15px;
  right: 15px;
  width: 135px;
}

/* 爆炸图底部说明小注 */
.stage-foot {
  font-family: var(--mono-family);
  font-size: 10px;
  color: var(--axis-line);
  display: flex;
  justify-content: space-between;
  border-top: 1px dashed var(--axis-line);
  padding-top: 6px;
  z-index: 3;
}

/* 通用区块 Section */
.content-section {
  padding: 54px 0;
  border-bottom: 1px solid var(--border-line);
}

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

.section-title {
  font-size: 1.65rem;
  font-weight: 800;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 12px;
}

.section-title::before {
  content: "";
  display: inline-block;
  width: 10px;
  height: 10px;
  background-color: var(--accent-seq);
  border: 1px solid var(--border-line);
}

.section-subtitle {
  font-size: 0.95rem;
  color: var(--text-muted);
  margin-top: 6px;
}

/* 特色区域：横条 + 补充卡 */
.features-stack {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 24px;
}

.feature-strip {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 20px;
  padding: 16px 20px;
  background-color: #FFFFFF;
  border: 1px solid var(--border-line);
  border-radius: 4px;
  align-items: center;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.feature-strip:hover {
  border-color: var(--accent-seq);
  transform: translateX(4px);
}

.feature-strip-title {
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 8px;
}

.feature-strip-title::before {
  content: "»";
  color: var(--accent-seq);
  font-weight: bold;
}

.feature-strip-desc {
  font-size: 0.92rem;
  color: var(--text-muted);
}

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

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

.feature-extra-card img {
  width: 100%;
  height: 180px;
  object-fit: cover;
  border: 1px solid var(--axis-line);
  margin-bottom: 14px;
  display: block;
  border-radius: 2px;
}

.feature-extra-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text-main);
}

.feature-extra-card p {
  font-size: 0.88rem;
  color: var(--text-muted);
}

/* 代码示例卡片 */
.code-box {
  background-color: #24211D;
  color: #ECE7DE;
  border: 1px solid var(--border-line);
  padding: 14px 18px;
  font-family: var(--mono-family);
  font-size: 0.85rem;
  line-height: 1.55;
  border-radius: 4px;
  overflow-x: auto;
  margin-top: 14px;
}

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

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

.step-card:hover {
  border-color: var(--accent-seq);
}

.step-seq {
  font-family: var(--mono-family);
  font-size: 1.6rem;
  font-weight: 900;
  color: var(--accent-seq);
  line-height: 1;
  margin-bottom: 12px;
  border-bottom: 1px dashed var(--axis-line);
  padding-bottom: 8px;
}

.step-title {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text-main);
}

.step-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* 对照清单（深色/高对比大卡） */
.checklist-card {
  border: 2px solid var(--border-line);
  background-color: #FFFFFF;
  border-radius: 4px;
  padding: 28px;
  position: relative;
}

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

.checklist-header h3 {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-main);
}

.checklist-tag {
  font-family: var(--mono-family);
  font-size: 11px;
  color: var(--accent-seq);
  padding: 2px 8px;
  border: 1px solid var(--accent-seq);
  font-weight: bold;
}

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

.checklist-table th, .checklist-table td {
  padding: 12px 14px;
  text-align: left;
  font-size: 0.9rem;
  border-bottom: 1px solid #EAE5DB;
}

.checklist-table th {
  background-color: var(--part-bg);
  font-weight: 700;
  color: var(--text-main);
  border-bottom: 1px solid var(--border-line);
}

.badge-omit {
  color: var(--accent-seq);
  font-weight: 700;
  font-family: var(--mono-family);
}

.badge-standard {
  color: #2E6B4A;
  font-weight: 700;
  font-family: var(--mono-family);
}

/* 场景区域（4个岗位气泡卡） */
.scenes-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.scene-card {
  border: 1px solid var(--border-line);
  background-color: #FFFFFF;
  border-radius: 4px;
  padding: 18px;
  display: flex;
  flex-direction: column;
}

.scene-persona {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
  border-bottom: 1px dashed var(--axis-line);
  padding-bottom: 8px;
}

.scene-role {
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--accent-seq);
}

.scene-quote {
  font-size: 0.88rem;
  color: var(--text-main);
  font-style: italic;
  margin-bottom: 12px;
  line-height: 1.5;
}

.scene-action {
  margin-top: auto;
  font-size: 0.82rem;
  color: var(--text-muted);
  border-top: 1px solid #EAE5DB;
  padding-top: 8px;
}

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

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

.tip-card:hover {
  border-color: var(--accent-seq);
}

.tip-num {
  font-family: var(--mono-family);
  font-size: 0.85rem;
  color: var(--accent-seq);
  font-weight: bold;
  margin-bottom: 6px;
}

.tip-title {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text-main);
}

.tip-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* 卡点笔记：失败现象 + 处理顺序 */
.blocker-stack {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.blocker-item {
  border: 1px solid var(--border-line);
  background-color: #FFFFFF;
  border-radius: 4px;
  padding: 18px 22px;
}

.blocker-symptom {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
  font-weight: 700;
  font-size: 0.98rem;
  color: var(--accent-seq);
}

.blocker-symptom::before {
  content: "FAIL";
  font-family: var(--mono-family);
  font-size: 10px;
  border: 1px solid var(--accent-seq);
  padding: 1px 4px;
  background-color: #FBEBEB;
}

.blocker-solution {
  font-size: 0.9rem;
  color: var(--text-muted);
  padding-left: 14px;
  border-left: 2px solid var(--accent-seq);
}

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

/* FAQ 手风琴 */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

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

.faq-item summary {
  padding: 16px 20px;
  font-weight: 700;
  font-size: 1rem;
  color: var(--text-main);
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

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

.faq-item summary::after {
  content: "+";
  font-size: 1.3rem;
  color: var(--accent-seq);
  font-family: var(--mono-family);
  font-weight: bold;
}

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

.faq-content {
  padding: 0 20px 18px 20px;
  font-size: 0.92rem;
  color: var(--text-muted);
  border-top: 1px dashed var(--axis-line);
  padding-top: 12px;
  line-height: 1.7;
}

/* 资讯列表 */
.news-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 16px;
}

.news-card {
  border: 1px solid var(--border-line);
  background-color: #FFFFFF;
  border-radius: 4px;
  padding: 14px 18px;
  text-decoration: none;
  color: var(--text-main);
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: all 0.2s ease;
}

.news-card:hover {
  border-color: var(--accent-seq);
  background-color: #FAF8F3;
}

.news-title {
  font-size: 0.92rem;
  font-weight: 600;
  padding-right: 12px;
}

.news-date {
  font-family: var(--mono-family);
  font-size: 0.8rem;
  color: var(--accent-seq);
  white-space: nowrap;
}

.news-footer-time {
  font-size: 0.82rem;
  color: var(--axis-line);
  font-family: var(--mono-family);
  text-align: right;
}

/* 收尾 CTA */
.cta-box {
  border: 2px solid var(--border-line);
  background-color: #FFFFFF;
  border-radius: 4px;
  padding: 36px 24px;
  text-align: center;
  margin: 36px 0;
}

.cta-title {
  font-size: 1.45rem;
  font-weight: 800;
  margin-bottom: 12px;
  color: var(--text-main);
}

.cta-desc {
  font-size: 0.95rem;
  color: var(--text-muted);
  margin-bottom: 24px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* Footer 页脚 */
.site-footer {
  background-color: #ECE7DE;
  border-top: 1px solid var(--border-line);
  padding: 48px 0 24px;
  font-size: 0.88rem;
}

.footer-top {
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr 1fr;
  gap: 32px;
  margin-bottom: 36px;
}

.footer-brand h4 {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 10px;
}

.footer-brand p {
  color: var(--text-muted);
  line-height: 1.6;
  font-size: 0.85rem;
}

.footer-col h5 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 12px;
  border-bottom: 1px solid var(--axis-line);
  padding-bottom: 4px;
}

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

.footer-links a {
  text-decoration: none;
  color: var(--text-muted);
  font-size: 0.85rem;
  transition: color 0.2s ease;
}

.footer-links a:hover {
  color: var(--accent-seq);
  text-decoration: underline;
}

.footer-bottom {
  border-top: 1px dashed var(--axis-line);
  padding-top: 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 0.8rem;
  color: var(--axis-line);
  font-family: var(--mono-family);
}

/* 响应式适配 */
@media (max-width: 900px) {
  .hero-grid {
    grid-template-columns: 1fr;
  }
  .feature-strip {
    grid-template-columns: 1fr;
    gap: 8px;
  }
  .feature-extra-grid {
    grid-template-columns: 1fr;
  }
  .steps-grid {
    grid-template-columns: 1fr 1fr;
  }
  .scenes-grid {
    grid-template-columns: 1fr 1fr;
  }
  .tips-grid {
    grid-template-columns: 1fr;
  }
  .news-grid {
    grid-template-columns: 1fr;
  }
  .footer-top {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 640px) {
  .h1-angle {
    font-size: 1.65rem;
  }
  .steps-grid {
    grid-template-columns: 1fr;
  }
  .scenes-grid {
    grid-template-columns: 1fr;
  }
  .footer-top {
    grid-template-columns: 1fr;
  }
  .header-inner {
    flex-direction: column;
    height: auto;
    padding: 12px 0;
    gap: 10px;
  }
  .hero-exploded-stage {
    min-height: 420px;
  }
}
/* 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;
  }
}