/* ==========================================================================
   DeepSeek Y2K "Chrome Band Horizontal Ribbon" Design System
   铬面横带 · 金属镜面流光与三层水平带专属样式规范
   色限严控：
   - 铬灰 Chrome Gray: #C5CCD3
   - 深槽 Deep Groove: #1C2128
   - 冰蓝高光 Ice Blue Glare: #9FD4FF
   - 纯白高光线 Pure White Sheen: #FFFFFF
   - 声呐绿 Sonar Green: rgba(0, 229, 160, 1) (首屏 Canvas 专属)
   ========================================================================== */

:root {
  --color-chrome: #C5CCD3;          /* 主铬灰光泽 */
  --color-chrome-light: #E4E8EC;    /* 亮部铬镜 */
  --color-chrome-dark: #98A2AB;     /* 阴暗金属折射 */
  --color-groove: #1C2128;          /* 金属深槽底色 */
  --color-groove-dark: #12161B;     /* 极深机械沉槽 */
  --color-iceblue: #9FD4FF;         /* 冰蓝冷电高光 */
  --color-iceblue-glow: rgba(159, 212, 255, 0.45);
  --color-white-sheen: #FFFFFF;     /* 高光一条白线 */
  --color-sonar: rgba(0, 229, 160, 1); /* 声呐雷达专属绿 */

  --font-y2k: "Eurostile", "Microgramma", "Arial Black", "Trebuchet MS", sans-serif;
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: "SF Mono", "Fira Code", "Courier New", monospace;

  /* 经典 Y2K 镜面渐变与高光线 */
  --gradient-chrome: linear-gradient(
    180deg,
    #E4E8EC 0%,
    #FFFFFF 3%,
    #C5CCD3 48%,
    #8A959F 50%,
    #A7B1BA 52%,
    #E4E8EC 98%,
    #7B8690 100%
  );
  --gradient-chrome-dark: linear-gradient(
    180deg,
    #2E3742 0%,
    #1C2128 48%,
    #12161B 52%,
    #242D38 100%
  );
  --shadow-bevel: 
    inset 0 1px 0 rgba(255, 255, 255, 0.9),
    inset 0 -1px 0 rgba(0, 0, 0, 0.6),
    0 8px 24px rgba(28, 33, 40, 0.35);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  background-color: var(--color-groove);
  color: var(--color-chrome-light);
  font-family: var(--font-body);
  line-height: 1.6;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

body {
  min-height: 100vh;
  background-color: var(--color-groove);
  color: var(--color-chrome-light);
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* ==========================================================================
   1. 顶栏规范：左右分栏
   左边只有 Logo，右边是「API 开放平台」和「English」。
   它不承担主导航，首页、网页版、Harness 都没放在这里，入口被下放到首屏卡片和页脚。
   ========================================================================== */
.chrome-header {
  width: 100%;
  background: var(--gradient-chrome-dark);
  border-bottom: 2px solid var(--color-chrome-dark);
  position: relative;
  z-index: 50;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.4);
}

/* 顶栏顶端贯穿式高光白线 */
.chrome-sheen-line-top {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, transparent 0%, #FFFFFF 25%, #9FD4FF 50%, #FFFFFF 75%, transparent 100%);
  pointer-events: none;
}

.chrome-header-inner {
  max-width: 1320px;
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.chrome-brand-logo a {
  display: flex;
  align-items: center;
  gap: 12px;
}

.chrome-brand-logo img {
  height: 38px;
  width: auto;
  filter: drop-shadow(0 0 8px var(--color-iceblue-glow));
}

.chrome-header-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.chrome-btn-api {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--gradient-chrome);
  color: var(--color-groove-dark);
  padding: 8px 20px;
  font-family: var(--font-y2k);
  font-size: 13.5px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border: 1px solid #FFFFFF;
  border-radius: 2px;
  box-shadow: var(--shadow-bevel);
  transition: all 0.2s ease;
}

.chrome-btn-api:hover {
  filter: brightness(1.1);
  transform: translateY(-2px);
  box-shadow: 0 0 16px var(--color-iceblue);
}

.chrome-btn-lang {
  display: inline-flex;
  align-items: center;
  padding: 7px 14px;
  font-family: var(--font-y2k);
  font-size: 13px;
  font-weight: 700;
  color: var(--color-chrome-light);
  border: 1px solid var(--color-chrome-dark);
  background: rgba(28, 33, 40, 0.6);
  border-radius: 2px;
  transition: all 0.2s ease;
}

.chrome-btn-lang:hover {
  border-color: var(--color-iceblue);
  color: var(--color-iceblue);
}

/* ==========================================================================
   2. 首屏规范：整页重心
   canvas 画在上层区域偏右：同心圆、十字线、扫描扇形和回波点，颜色是 rgba(0,229,160) 的声呐绿。
   文字叠在画布上，顺序是公告条、超大标题、副题，然后两张同结构卡片。
   主卡链到 web.html，次卡是空链接。
   两张卡都是「图标、标题、说明、箭头」，差别只在主次样式，布局上是一对等宽入口。
   【风格融入】：Y2K 铬面金属带、高光白线、深槽 #1C2128、冰蓝高光 #9FD4FF
   ========================================================================== */
.chrome-hero-section {
  position: relative;
  width: 100%;
  padding: 68px 0 88px 0;
  background: radial-gradient(circle at 65% 35%, #2B3440 0%, #1C2128 70%);
  border-bottom: 3px solid var(--color-chrome-dark);
  overflow: hidden;
}

/* 上层偏右放置的声呐绿 Canvas */
.chrome-sonar-canvas-wrap {
  position: absolute;
  top: 10px;
  right: calc(50% - 660px);
  width: 580px;
  height: 580px;
  pointer-events: none;
  z-index: 1;
  opacity: 0.92;
}

.chrome-hero-container {
  position: relative;
  z-index: 2;
  max-width: 1320px;
  margin: 0 auto;
  padding: 0 24px;
}

/* 顺序1：公告条 */
.chrome-announcement {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  background: rgba(28, 33, 40, 0.85);
  border: 1px solid var(--color-chrome-dark);
  padding: 6px 18px;
  border-radius: 2px;
  font-size: 13px;
  color: var(--color-chrome-light);
  margin-bottom: 24px;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2), 0 4px 12px rgba(0, 0, 0, 0.3);
}

.chrome-announcement .badge {
  background: var(--color-iceblue);
  color: var(--color-groove-dark);
  font-family: var(--font-y2k);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.1em;
  padding: 2px 8px;
}

/* 顺序2：超大标题 */
.chrome-hero-title {
  font-family: var(--font-y2k);
  font-size: clamp(40px, 5.8vw, 76px);
  font-weight: 900;
  line-height: 1.08;
  color: var(--color-chrome-light);
  letter-spacing: -0.01em;
  text-transform: uppercase;
  max-width: 860px;
  margin-bottom: 22px;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.8);
}

.chrome-hero-title span.glare {
  background: linear-gradient(180deg, #FFFFFF 0%, #C5CCD3 50%, #9FD4FF 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
  position: relative;
}

/* 顺序3：副题 */
.chrome-hero-subtitle {
  font-size: clamp(16px, 1.8vw, 19px);
  line-height: 1.75;
  color: #A3AFBC;
  max-width: 760px;
  margin-bottom: 44px;
  border-left: 3px solid var(--color-iceblue);
  padding-left: 16px;
}

/* 顺序4：两张同结构卡片（一对等宽入口）
   主卡链到 web.html，次卡是空链接。两张卡都是「图标、标题、说明、箭头」，差别只在主次样式 */
.chrome-hero-cards-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  max-width: 1000px;
}

.chrome-entry-card {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 34px;
  position: relative;
  min-height: 250px;
  border-radius: 2px;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

/* 主卡样式：全反射铬面，冰蓝电镀边缘 */
.chrome-entry-card.primary {
  background: var(--gradient-chrome);
  color: var(--color-groove-dark);
  border: 1.5px solid #FFFFFF;
  box-shadow: var(--shadow-bevel), 0 0 20px var(--color-iceblue-glow);
}

.chrome-entry-card.primary:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.4), 0 0 30px var(--color-iceblue);
}

.chrome-entry-card.primary .card-icon {
  background: var(--color-groove-dark);
  color: var(--color-iceblue);
  border: 1px solid var(--color-chrome-dark);
}

.chrome-entry-card.primary .card-title {
  color: var(--color-groove-dark);
}

.chrome-entry-card.primary .card-desc {
  color: #2D3748;
}

.chrome-entry-card.primary .card-arrow {
  color: var(--color-groove-dark);
  border-top: 1px solid rgba(28, 33, 40, 0.3);
}

/* 次卡样式：深槽金属拉丝，白光线修饰 */
.chrome-entry-card.secondary {
  background: var(--gradient-chrome-dark);
  color: var(--color-chrome-light);
  border: 1.5px solid var(--color-chrome-dark);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.3), 0 8px 24px rgba(0, 0, 0, 0.35);
}

.chrome-entry-card.secondary:hover {
  transform: translateY(-4px);
  border-color: var(--color-iceblue);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.5), 0 12px 30px rgba(0, 0, 0, 0.45);
}

.chrome-entry-card.secondary .card-icon {
  background: rgba(159, 212, 255, 0.1);
  color: var(--color-iceblue);
  border: 1px solid var(--color-iceblue);
}

.chrome-entry-card.secondary .card-title {
  color: var(--color-chrome-light);
}

.chrome-entry-card.secondary .card-desc {
  color: #929FA9;
}

.chrome-entry-card.secondary .card-arrow {
  color: var(--color-iceblue);
  border-top: 1px solid rgba(197, 204, 211, 0.2);
}

/* 同结构元素规范：图标、标题、说明、箭头 */
.card-head {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 14px;
}

.card-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 2px;
  flex-shrink: 0;
}

.card-title {
  font-family: var(--font-y2k);
  font-size: 22px;
  font-weight: 800;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.card-desc {
  font-size: 14.5px;
  line-height: 1.65;
  margin-bottom: 24px;
}

.card-arrow {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 16px;
  font-family: var(--font-y2k);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

/* ==========================================================================
   全新提示词专属核心结构：“铬面横带”
   布局：三条水平金属带，中间带最宽。
   设计：Y2K 铬面，高光是一条白线。
   骨架：上带品牌，中带主行动，下带三个产品。
   配色：铬灰 #C5CCD3、深槽 #1C2128、冰蓝高光 #9FD4FF。
   提示词：DeepSeek官网由三条铬带构成。上带「Deep Seek」，中带按钮「DeepSeek网页版入口」，
   下带 AI、api开放平台、Harness。口号「探索未至之境」刻在中带边缘。
   色限 #C5CCD3 #1C2128 #9FD4FF。
   ========================================================================== */
.chrome-tri-band-section {
  width: 100%;
  background: var(--color-groove-dark);
  padding: 60px 0 80px 0;
  border-bottom: 3px solid var(--color-chrome-dark);
  position: relative;
}

.chrome-tri-band-container {
  max-width: 1320px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

/* 三条水平金属带公用基类 */
.chrome-band-strip {
  position: relative;
  width: 100%;
  border-radius: 2px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.5);
  overflow: hidden;
}

/* 高光是一条白线 (Pure White Sheen Line) */
.chrome-band-strip::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, transparent 0%, #FFFFFF 20%, #9FD4FF 50%, #FFFFFF 80%, transparent 100%);
  z-index: 5;
  pointer-events: none;
}

/* 上带：品牌「Deep Seek」 */
.chrome-band-top {
  height: 90px;
  background: var(--gradient-chrome-dark);
  border: 1.5px solid var(--color-chrome-dark);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 36px;
}

.chrome-band-top-brand {
  font-family: var(--font-y2k);
  font-size: 32px;
  font-weight: 900;
  letter-spacing: 0.18em;
  color: var(--color-chrome-light);
  text-transform: uppercase;
  text-shadow: 0 0 12px var(--color-iceblue-glow);
}

.chrome-band-top-sub {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-iceblue);
  letter-spacing: 0.2em;
  text-transform: uppercase;
}

/* 中带：最宽！中带主行动（按钮「DeepSeek网页版入口」，口号「探索未至之境」刻在中带边缘） */
.chrome-band-mid {
  min-height: 240px;
  background: var(--gradient-chrome);
  border: 2px solid #FFFFFF;
  color: var(--color-groove-dark);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 32px 36px;
  box-shadow: var(--shadow-bevel), 0 0 24px var(--color-iceblue-glow);
  position: relative;
}

/* 刻在中带顶边缘与底边缘的口号「探索未至之境」 */
.chrome-band-edge-slogan {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-y2k);
  font-size: 12px;
  font-weight: 900;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: #4A5562;
  border-bottom: 1px solid rgba(28, 33, 40, 0.2);
  padding-bottom: 8px;
}

.chrome-band-mid-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 30px;
  margin: 20px 0;
}

.chrome-band-mid-text {
  max-width: 680px;
}

.chrome-band-mid-text h3 {
  font-family: var(--font-y2k);
  font-size: 30px;
  font-weight: 900;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-groove-dark);
}

.chrome-band-mid-text p {
  font-size: 15px;
  color: #333E48;
  margin-top: 6px;
}

/* 中带核心主行动按钮「DeepSeek网页版入口」 */
.chrome-main-action-btn {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  background: var(--color-groove-dark);
  color: #FFFFFF;
  border: 2px solid #FFFFFF;
  padding: 16px 36px;
  font-family: var(--font-y2k);
  font-size: 17px;
  font-weight: 900;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4), 0 0 16px var(--color-iceblue);
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.2s ease;
}

.chrome-main-action-btn:hover {
  background: #000;
  transform: translateY(-2px);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.5), 0 0 24px var(--color-iceblue);
}

.chrome-band-edge-slogan-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  color: #4A5562;
  letter-spacing: 0.2em;
  border-top: 1px solid rgba(28, 33, 40, 0.2);
  padding-top: 8px;
}

/* 下带：三个产品（AI、api开放平台、Harness） */
.chrome-band-bottom {
  min-height: 110px;
  background: var(--gradient-chrome-dark);
  border: 1.5px solid var(--color-chrome-dark);
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  align-items: stretch;
}

.chrome-band-product-cell {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 20px 28px;
  border-right: 1px solid var(--color-chrome-dark);
  transition: all 0.2s ease;
}

.chrome-band-product-cell:last-child {
  border-right: none;
}

.chrome-band-product-cell:hover {
  background: rgba(159, 212, 255, 0.08);
}

.chrome-band-prod-num {
  font-family: var(--font-y2k);
  font-size: 26px;
  font-weight: 900;
  color: var(--color-iceblue);
  line-height: 1;
}

.chrome-band-prod-title {
  font-family: var(--font-y2k);
  font-size: 17px;
  font-weight: 800;
  color: var(--color-chrome-light);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.chrome-band-prod-desc {
  font-size: 12px;
  color: #929FA9;
  margin-top: 2px;
}

/* ==========================================================================
   3. 能力区规范
   把首屏的声呐从背景变成内容。
   四张卡横排，每张仍是图标、标题、一段说明，对应深海扫描、探测未知、知识显影、Harness。
   下面的指标条把四组数字等分排开，用来打断卡片墙，给页面一个横向节奏。
   ========================================================================== */
.chrome-capability-section {
  width: 100%;
  background: var(--color-groove);
  padding: 80px 0;
  border-bottom: 3px solid var(--color-chrome-dark);
}

.chrome-section-header {
  max-width: 1320px;
  margin: 0 auto 40px auto;
  padding: 0 24px;
}

.chrome-section-tag {
  font-family: var(--font-y2k);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.16em;
  color: var(--color-iceblue);
  text-transform: uppercase;
  margin-bottom: 8px;
  display: block;
}

.chrome-section-header h2 {
  font-family: var(--font-y2k);
  font-size: clamp(28px, 3.4vw, 44px);
  font-weight: 900;
  color: var(--color-chrome-light);
  text-transform: uppercase;
  letter-spacing: 0.02em;
}

.chrome-section-header p {
  font-size: 15.5px;
  color: #9AA7B4;
  max-width: 740px;
  margin-top: 8px;
}

/* 四张卡横排 */
.chrome-cards-quad {
  max-width: 1320px;
  margin: 0 auto 48px auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.chrome-cap-card {
  background: var(--gradient-chrome-dark);
  border: 1.5px solid var(--color-chrome-dark);
  border-radius: 2px;
  padding: 30px 24px;
  display: flex;
  flex-direction: column;
  transition: all 0.25s ease;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2), 0 6px 16px rgba(0, 0, 0, 0.35);
  position: relative;
}

.chrome-cap-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-iceblue);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.4), 0 12px 28px rgba(0, 0, 0, 0.5), 0 0 16px var(--color-iceblue-glow);
}

.chrome-cap-icon {
  width: 48px;
  height: 48px;
  border-radius: 2px;
  background: rgba(159, 212, 255, 0.1);
  color: var(--color-iceblue);
  border: 1px solid var(--color-iceblue);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}

.chrome-cap-title {
  font-family: var(--font-y2k);
  font-size: 20px;
  font-weight: 800;
  color: var(--color-chrome-light);
  text-transform: uppercase;
  margin-bottom: 12px;
}

.chrome-cap-desc {
  font-size: 14px;
  line-height: 1.65;
  color: #9AA7B4;
}

/* 指标条：把四组数字等分排开，打断卡片墙 */
.chrome-metrics-bar {
  max-width: 1320px;
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 2px solid var(--color-chrome-dark);
  border-bottom: 2px solid var(--color-chrome-dark);
  background: var(--gradient-chrome-dark);
}

.chrome-metric-col {
  padding: 34px 24px;
  border-right: 1.5px solid rgba(197, 204, 211, 0.2);
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.chrome-metric-col:last-child {
  border-right: none;
}

.chrome-metric-val {
  font-family: var(--font-y2k);
  font-size: 42px;
  font-weight: 900;
  color: var(--color-iceblue);
  line-height: 1;
  margin-bottom: 6px;
  text-shadow: 0 0 10px var(--color-iceblue-glow);
}

.chrome-metric-val .unit {
  font-size: 20px;
  color: var(--color-chrome);
  margin-left: 2px;
}

.chrome-metric-label {
  font-family: var(--font-y2k);
  font-size: 14px;
  font-weight: 800;
  color: var(--color-chrome-light);
  text-transform: uppercase;
  margin-bottom: 2px;
}

.chrome-metric-sub {
  font-size: 12px;
  color: #8C99A6;
}

/* ==========================================================================
   4. 步骤区规范
   唯一写了内联布局的区块：外层灰底拉通全宽，内层再收成 1200px 居中。
   四步竖向排列，左侧数字、右侧标题加说明，和上面的四列网格形成横竖对比。
   ========================================================================== */
.chrome-steps-vertical-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.chrome-step-item {
  display: flex;
  gap: 28px;
  background: var(--gradient-chrome-dark);
  border: 1.5px solid var(--color-chrome-dark);
  border-radius: 2px;
  padding: 28px;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2), 0 4px 14px rgba(0, 0, 0, 0.35);
}

.chrome-step-number {
  font-family: var(--font-y2k);
  font-size: 40px;
  font-weight: 900;
  color: var(--color-iceblue);
  min-width: 60px;
  line-height: 1;
}

.chrome-step-content {
  flex: 1;
}

.chrome-step-title {
  font-family: var(--font-y2k);
  font-size: 21px;
  font-weight: 800;
  color: var(--color-chrome-light);
  text-transform: uppercase;
  letter-spacing: 0.02em;
  margin-bottom: 8px;
}

.chrome-step-desc {
  font-size: 14.5px;
  line-height: 1.7;
  color: #9AA7B4;
}

/* ==========================================================================
   5. API 区规范
   退成单列代码块。注释、关键字、字符串靠颜色区分，没有左右分栏，也没有请求和响应对照。
   ========================================================================== */
.chrome-api-section {
  width: 100%;
  background: var(--color-groove);
  padding: 80px 0;
  border-bottom: 3px solid var(--color-chrome-dark);
}

.chrome-code-terminal {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 24px;
}

.chrome-code-window {
  background: #12161B;
  border: 2px solid var(--color-chrome-dark);
  border-radius: 2px;
  overflow: hidden;
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.6);
  position: relative;
}

.chrome-code-window::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, #FFFFFF, #9FD4FF, #FFFFFF);
}

.chrome-code-topbar {
  background: #1F262F;
  padding: 14px 22px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--color-chrome-dark);
}

.chrome-code-title {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--color-chrome-light);
}

.chrome-code-pre {
  padding: 26px;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 13.5px;
  line-height: 1.7;
  color: #E4E8EC;
}

/* 语法着色：Y2K 金属冷调配色 */
.yk-comment { color: #6F7D8C; font-style: italic; }
.yk-keyword { color: #9FD4FF; font-weight: 700; }
.yk-string  { color: #E4E8EC; }
.yk-func    { color: #00E5A0; font-weight: 700; }
.yk-number  { color: #C5CCD3; }

/* ==========================================================================
   6. 影像区规范
   四张横图，只做展示，没有图注和点击。
   合理插入图片 1.webp-9.webp
   ========================================================================== */
.chrome-gallery-section {
  width: 100%;
  background: var(--color-groove);
  padding: 80px 0;
  border-bottom: 3px solid var(--color-chrome-dark);
}

.chrome-gallery-quad {
  max-width: 1320px;
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}

.chrome-gallery-item {
  border: 1.5px solid var(--color-chrome-dark);
  border-radius: 2px;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  background: #000;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
}

.chrome-gallery-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: contrast(1.1) brightness(0.95);
  transition: transform 0.4s ease;
}

.chrome-gallery-item:hover img {
  transform: scale(1.04);
}

/* ==========================================================================
   7. 页脚规范：多列
   品牌说明占更宽的一列，后面四列是研究、产品、法务、招聘。
   最底下一整条版权和第三方声明。
   ========================================================================== */
.chrome-footer {
  width: 100%;
  background: var(--color-groove-dark);
  border-top: 3px solid var(--color-chrome-dark);
  padding: 70px 0 30px 0;
  position: relative;
}

.chrome-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, transparent, #FFFFFF, #9FD4FF, transparent);
}

.chrome-footer-inner {
  max-width: 1320px;
  margin: 0 auto;
  padding: 0 24px;
}

.chrome-footer-grid {
  display: grid;
  grid-template-columns: 2.2fr 1fr 1fr 1fr 1fr;
  gap: 36px;
  margin-bottom: 50px;
}

.chrome-footer-brand img {
  height: 38px;
  width: auto;
  margin-bottom: 16px;
  filter: drop-shadow(0 0 6px var(--color-iceblue-glow));
}

.chrome-footer-brand p {
  font-size: 13.5px;
  line-height: 1.7;
  color: #8C99A6;
  max-width: 380px;
  margin-bottom: 16px;
}

.chrome-footer-col h4 {
  font-family: var(--font-y2k);
  font-size: 16px;
  font-weight: 800;
  color: var(--color-chrome-light);
  text-transform: uppercase;
  margin-bottom: 16px;
  border-bottom: 1.5px solid var(--color-chrome-dark);
  padding-bottom: 6px;
  letter-spacing: 0.05em;
}

.chrome-footer-col ul {
  list-style: none;
}

.chrome-footer-col li {
  margin-bottom: 10px;
}

.chrome-footer-col a {
  font-size: 13.5px;
  color: #8C99A6;
  transition: color 0.2s ease;
}

.chrome-footer-col a:hover {
  color: var(--color-iceblue);
}

.chrome-footer-bottom-bar {
  border-top: 1px solid rgba(197, 204, 211, 0.2);
  padding-top: 24px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: 12.5px;
  color: #6F7D8C;
}

/* 响应式断点适配 */
@media (max-width: 1024px) {
  .chrome-hero-cards-grid {
    grid-template-columns: 1fr;
  }
  .chrome-band-mid-content {
    flex-direction: column;
    align-items: flex-start;
  }
  .chrome-band-bottom {
    grid-template-columns: 1fr;
  }
  .chrome-band-product-cell {
    border-right: none;
    border-bottom: 1px solid var(--color-chrome-dark);
  }
  .chrome-cards-quad {
    grid-template-columns: repeat(2, 1fr);
  }
  .chrome-metrics-bar {
    grid-template-columns: repeat(2, 1fr);
  }
  .chrome-metric-col:nth-child(2) {
    border-right: none;
  }
  .chrome-gallery-quad {
    grid-template-columns: repeat(2, 1fr);
  }
  .chrome-footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .chrome-sonar-canvas-wrap {
    opacity: 0.35;
    right: -120px;
  }
  .chrome-cards-quad {
    grid-template-columns: 1fr;
  }
  .chrome-metrics-bar {
    grid-template-columns: 1fr;
  }
  .chrome-metric-col {
    border-right: none;
    border-bottom: 1px solid rgba(197, 204, 211, 0.2);
  }
  .chrome-step-item {
    flex-direction: column;
    gap: 12px;
  }
  .chrome-gallery-quad {
    grid-template-columns: 1fr;
  }
  .chrome-footer-grid {
    grid-template-columns: 1fr;
  }
}