/* ========================================================
   DeepSeek 海图经纬风格核心样式表 (nautical.css)
   设计风格：海图经纬 (Nautical Hydrographic Chart)
   设计理念：海洋测绘，经纬网铺满，信息只放在交叉点，等深线疏密表示权重。
   骨架特征：
     - 图名：「DeepSeek - 探索未至之境」
     - 三个港口：网页版、api开放平台、Harness
     - 罗经：中心写「DeepSeek AI」
   配色严格限定：
     - 海图蓝: #16324F
     - 等深青: #4FA3C7
     - 沙: #E6D3B3
   辅助色阶：
     - 深海渊蓝: #0F2338
     - 航道青: #337C9E
     - 浅沙纸白: #F4EAD9
     - 墨标文字: #0E1E2E
     - 声呐绿: rgba(0, 229, 160, 0.9)
   ======================================================== */

:root {
  --color-chart-blue: #16324F;      /* 海图深蓝 (海洋图底) */
  --color-abyss-blue: #0E2033;      /* 渊蓝深海 */
  --color-depth-cyan: #4FA3C7;      /* 等深青 (等深线、航道、浮标) */
  --color-sand: #E6D3B3;            /* 沙色 (沙洲、陆地轮廓、经纬网线、羊皮纸色) */
  --color-sand-light: #F4EAD9;      /* 浅沙色 */
  --color-sand-dim: rgba(230, 211, 179, 0.12);
  --color-depth-dim: rgba(79, 163, 199, 0.15);
  
  --color-sonar-green: rgba(0, 229, 160, 0.9); /* 声呐扫描绿 */
  
  --font-serif: "Songti SC", "SimSun", "STSong", "Baskerville", "Source Han Serif SC", Georgia, serif;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: "Courier New", "Consolas", "SF Mono", monospace;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  background-color: var(--color-chart-blue);
  color: var(--color-sand);
}

body {
  font-family: var(--font-sans);
  background-color: var(--color-chart-blue);
  color: var(--color-sand);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  position: relative;
  overflow-x: hidden;
}

/* 经纬网格铺满全站底纹 + 海洋测绘等深线层 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  background-image: 
    linear-gradient(rgba(230, 211, 179, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(230, 211, 179, 0.06) 1px, transparent 1px),
    radial-gradient(circle at 75% 25%, rgba(79, 163, 199, 0.12) 0%, transparent 45%),
    radial-gradient(circle at 25% 75%, rgba(79, 163, 199, 0.08) 0%, transparent 55%);
  background-size: 60px 60px, 60px 60px, 100% 100%, 100% 100%;
  pointer-events: none;
  z-index: 0;
}

/* 链接全局规范 */
a {
  color: inherit;
  text-decoration: none;
}

/* ========================================================
   1. 顶栏：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
   ======================================================== */
.topbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(15, 35, 56, 0.94);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(230, 211, 179, 0.25);
  box-shadow: 0 4px 20px rgba(10, 22, 36, 0.6);
}

.topbar-inner {
  max-width: 1400px;
  margin: 0 auto;
  height: 72px;
  padding: 0 32px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.topbar-left {
  display: flex;
  align-items: center;
}

.brand-logo-link {
  display: inline-flex;
  align-items: center;
  transition: opacity 0.2s ease;
}

.brand-logo-link:hover {
  opacity: 0.85;
}

.brand-logo-img {
  height: 38px;
  width: auto;
  display: block;
}

.topbar-right {
  display: flex;
  align-items: center;
  gap: 20px;
}

.topbar-link {
  font-family: var(--font-mono);
  font-size: 13.5px;
  font-weight: 700;
  color: var(--color-sand);
  padding: 8px 18px;
  border: 1px solid var(--color-sand);
  border-radius: 2px;
  background: rgba(230, 211, 179, 0.08);
  letter-spacing: 1px;
  transition: all 0.25s ease;
  text-transform: uppercase;
}

.topbar-link:hover {
  background: var(--color-sand);
  color: var(--color-chart-blue);
  box-shadow: 0 0 16px rgba(230, 211, 179, 0.4);
}

.topbar-lang {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-depth-cyan);
  padding: 6px 12px;
  border-left: 1px solid rgba(230, 211, 179, 0.2);
  letter-spacing: 0.5px;
  cursor: default;
}

/* ========================================================
   2. 首屏：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，颜色为 rgba(0,229,160) 的声呐绿
   - 文字叠在画布上：公告条、超大标题、副题、两张同结构卡片
   - 海图经纬核心骨架融合：
     - 图名「DeepSeek - 探索未至之境」
     - 三个港口（网页版、api开放平台、Harness）交叉点
     - 罗经中心写「DeepSeek AI」
   ======================================================== */
.hero-section {
  position: relative;
  max-width: 1400px;
  margin: 0 auto;
  padding: 48px 32px 64px;
  min-height: 840px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  z-index: 1;
}

/* 右偏声呐 Canvas 画布容器 */
.hero-canvas-container {
  position: absolute;
  top: 15px;
  right: 15px;
  width: 580px;
  height: 580px;
  pointer-events: none;
  z-index: 1;
  opacity: 0.88;
}

#sonarCanvas {
  width: 100%;
  height: 100%;
  display: block;
}

/* 首屏主内容区双栏 */
.hero-main-grid {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 40px;
  align-items: center;
}

.hero-text-content {
  display: flex;
  flex-direction: column;
}

/* 公告条 */
.hero-notice-bar {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  background: rgba(14, 32, 51, 0.8);
  border: 1px solid var(--color-depth-cyan);
  border-left: 4px solid var(--color-sand);
  padding: 6px 16px;
  border-radius: 2px;
  margin-bottom: 22px;
  align-self: flex-start;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.notice-badge {
  font-family: var(--font-mono);
  font-size: 11px;
  background: var(--color-sand);
  color: var(--color-chart-blue);
  padding: 2px 8px;
  font-weight: 900;
  letter-spacing: 1px;
}

.notice-text {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-sand-light);
  letter-spacing: 0.5px;
}

/* 图名：符合提示词要素 */
.chart-official-title {
  font-family: var(--font-serif);
  font-size: 14.5px;
  font-weight: 800;
  color: var(--color-depth-cyan);
  letter-spacing: 4px;
  text-transform: uppercase;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.chart-official-title::before {
  content: "⚓";
  font-size: 15px;
  color: var(--color-sand);
}

/* 超大标题 */
.hero-title {
  font-family: var(--font-serif);
  font-size: 56px;
  line-height: 1.15;
  font-weight: 900;
  color: var(--color-sand-light);
  letter-spacing: 1px;
  margin-bottom: 18px;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.5);
}

.hero-title span {
  color: var(--color-depth-cyan);
  border-bottom: 2px solid var(--color-depth-cyan);
  padding-bottom: 4px;
}

/* 副题 */
.hero-subtitle {
  font-size: 16px;
  line-height: 1.75;
  color: rgba(230, 211, 179, 0.85);
  max-width: 620px;
  margin-bottom: 34px;
}

/* 两张同结构卡片：等宽入口 */
.hero-cards-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  max-width: 640px;
}

.hero-entry-card {
  display: flex;
  flex-direction: column;
  padding: 24px 22px;
  border-radius: 2px;
  text-decoration: none;
  transition: all 0.25s ease;
  position: relative;
  background: rgba(14, 32, 51, 0.85);
  border: 1px solid rgba(230, 211, 179, 0.25);
}

/* 主卡：链到 web.html */
.hero-entry-card.primary {
  border-top: 3px solid var(--color-sand);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.45);
}

.hero-entry-card.primary:hover {
  transform: translateY(-3px);
  border-color: var(--color-sand);
  box-shadow: 0 12px 30px rgba(230, 211, 179, 0.2);
  background: rgba(19, 44, 70, 0.95);
}

/* 次卡：空链接 */
.hero-entry-card.secondary {
  border-top: 3px solid var(--color-depth-cyan);
  cursor: default;
}

.hero-entry-card.secondary:hover {
  border-color: var(--color-depth-cyan);
}

.card-icon {
  font-size: 26px;
  margin-bottom: 12px;
}

.hero-entry-card.primary .card-icon {
  color: var(--color-sand);
}

.hero-entry-card.secondary .card-icon {
  color: var(--color-depth-cyan);
}

.card-title {
  font-family: var(--font-serif);
  font-size: 19px;
  font-weight: 800;
  color: var(--color-sand-light);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.card-desc {
  font-size: 13.5px;
  line-height: 1.55;
  color: rgba(230, 211, 179, 0.75);
  margin-bottom: 16px;
  flex-grow: 1;
}

.card-arrow {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 800;
  color: var(--color-sand);
  align-self: flex-start;
  transition: transform 0.2s ease;
}

.hero-entry-card:hover .card-arrow {
  transform: translateX(4px);
}

/* ========================================================
   首屏右侧：海图罗经与三大港口交叉网络
   - 罗经中心写「DeepSeek AI」
   - 经纬交叉点：信息只放在交叉点上（港口网页版、api开放平台、Harness）
   - 等深线疏密表示权重
   ======================================================== */
.chart-hydro-module {
  position: relative;
  z-index: 2;
  background: rgba(14, 32, 51, 0.9);
  border: 1px solid rgba(230, 211, 179, 0.3);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.6);
  padding: 30px 24px;
  border-radius: 4px;
}

/* 航海罗经盘 (Compass Rose) */
.compass-rose-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  position: relative;
  margin-bottom: 28px;
}

.compass-dial {
  width: 220px;
  height: 220px;
  border-radius: 50%;
  border: 2px dashed var(--color-sand);
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 
    0 0 0 8px rgba(79, 163, 199, 0.15),
    inset 0 0 20px rgba(79, 163, 199, 0.2);
}

.compass-cardinal {
  position: absolute;
  font-family: var(--font-serif);
  font-size: 13px;
  font-weight: 900;
  color: var(--color-depth-cyan);
}
.compass-cardinal.north { top: 6px; }
.compass-cardinal.south { bottom: 6px; }
.compass-cardinal.east  { right: 8px; }
.compass-cardinal.west  { left: 8px; }

/* 十字罗经线 */
.compass-cross-line-h {
  position: absolute;
  width: 100%;
  height: 1px;
  background: rgba(230, 211, 179, 0.3);
}

.compass-cross-line-v {
  position: absolute;
  height: 100%;
  width: 1px;
  background: rgba(230, 211, 179, 0.3);
}

/* 罗经中心写「DeepSeek AI」 */
.compass-center-hub {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background: var(--color-chart-blue);
  border: 2px solid var(--color-sand);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 2;
  box-shadow: 0 0 16px rgba(0, 0, 0, 0.5);
  text-align: center;
  padding: 8px;
}

.compass-brand-name {
  font-family: var(--font-serif);
  font-size: 15px;
  font-weight: 900;
  color: var(--color-sand);
  letter-spacing: 1px;
  line-height: 1.2;
}

.compass-coord-sub {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--color-depth-cyan);
  margin-top: 4px;
}

/* 经纬网交叉点港口群 (三个港口：网页版、api开放平台、Harness) */
.chart-ports-grid {
  display: flex;
  flex-direction: column;
  gap: 14px;
  border-top: 1px solid rgba(230, 211, 179, 0.2);
  padding-top: 20px;
}

.chart-port-node {
  background: rgba(10, 22, 36, 0.85);
  border: 1px solid var(--color-depth-cyan);
  border-left: 4px solid var(--color-sand);
  padding: 12px 16px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: all 0.2s ease;
}

.chart-port-node:hover {
  background: rgba(22, 50, 79, 0.9);
  border-color: var(--color-sand);
}

.port-meta-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

.port-intersection-cross {
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--color-depth-cyan);
  font-weight: bold;
}

.port-name {
  font-family: var(--font-serif);
  font-size: 15px;
  font-weight: 800;
  color: var(--color-sand-light);
}

.port-coords {
  font-family: var(--font-mono);
  font-size: 11px;
  color: rgba(230, 211, 179, 0.65);
}

.port-status-pill {
  font-family: var(--font-mono);
  font-size: 11px;
  padding: 3px 8px;
  border-radius: 2px;
  background: rgba(79, 163, 199, 0.2);
  color: var(--color-depth-cyan);
  border: 1px solid var(--color-depth-cyan);
}

/* 等深线疏密表示权重图例 */
.bathymetry-contour-legend {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: rgba(230, 211, 179, 0.6);
  border-top: 1px dashed rgba(230, 211, 179, 0.2);
  padding-top: 10px;
}

/* ========================================================
   3. 能力区：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
   ======================================================== */
.capability-section {
  max-width: 1400px;
  margin: 0 auto;
  padding: 80px 32px;
  position: relative;
  z-index: 2;
}

.section-head-bar {
  border-bottom: 1px solid rgba(230, 211, 179, 0.25);
  padding-bottom: 16px;
  margin-bottom: 36px;
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
}

.section-head-title {
  font-family: var(--font-serif);
  font-size: 32px;
  font-weight: 900;
  color: var(--color-sand-light);
  letter-spacing: 1px;
}

.section-head-desc {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-depth-cyan);
}

/* 四张卡横排 */
.capability-cards-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
  margin-bottom: 48px;
}

.cap-card {
  background: rgba(14, 32, 51, 0.85);
  border: 1px solid rgba(230, 211, 179, 0.2);
  border-top: 3px solid var(--color-depth-cyan);
  border-radius: 2px;
  padding: 28px 22px;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.4);
  display: flex;
  flex-direction: column;
  transition: all 0.25s ease;
  position: relative;
}

.cap-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-sand);
  box-shadow: 0 10px 28px rgba(79, 163, 199, 0.2);
}

.cap-icon {
  font-size: 28px;
  color: var(--color-sand);
  margin-bottom: 16px;
}

.cap-title {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 800;
  color: var(--color-sand-light);
  margin-bottom: 10px;
  letter-spacing: 0.5px;
}

.cap-desc {
  font-size: 13.5px;
  line-height: 1.6;
  color: rgba(230, 211, 179, 0.8);
}

/* 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 */
.metrics-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  background: #0E2033;
  border: 1px solid var(--color-depth-cyan);
  border-left: 4px solid var(--color-sand);
  border-radius: 2px;
  padding: 28px 20px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
}

.metric-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 0 16px;
  position: relative;
}

.metric-item:not(:last-child)::after {
  content: "";
  position: absolute;
  right: 0;
  top: 15%;
  height: 70%;
  width: 1px;
  background: rgba(230, 211, 179, 0.2);
}

.metric-number {
  font-family: var(--font-mono);
  font-size: 38px;
  font-weight: 900;
  color: var(--color-sand);
  margin-bottom: 4px;
}

.metric-label {
  font-family: var(--font-serif);
  font-size: 14.5px;
  font-weight: 800;
  color: var(--color-sand-light);
  margin-bottom: 4px;
}

.metric-sub {
  font-size: 12px;
  color: var(--color-depth-cyan);
}

/* ========================================================
   4. 步骤区：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
   ======================================================== */
.process-section-outer {
  width: 100%;
  background: #11263C; /* 灰海图深底，拉通全宽 */
  border-top: 1px solid rgba(230, 211, 179, 0.2);
  border-bottom: 1px solid rgba(230, 211, 179, 0.2);
  padding: 85px 0;
}

.process-section-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 32px;
}

.process-steps-list {
  display: flex;
  flex-direction: column;
  gap: 24px;
  margin-top: 40px;
}

.process-step-item {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 32px;
  align-items: center;
  background: #16324F;
  border: 1px solid rgba(230, 211, 179, 0.2);
  border-radius: 2px;
  padding: 26px 36px;
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.3);
  transition: all 0.2s ease;
}

.process-step-item:hover {
  border-color: var(--color-sand);
  transform: translateX(6px);
}

.step-num-box {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 42px;
  font-weight: 900;
  color: var(--color-sand);
  border-right: 2px solid var(--color-depth-cyan);
  padding-right: 24px;
  line-height: 1;
}

.step-num-label {
  font-size: 11px;
  letter-spacing: 2px;
  color: var(--color-depth-cyan);
  margin-top: 6px;
  text-transform: uppercase;
}

.step-content-box {
  display: flex;
  flex-direction: column;
}

.step-content-title {
  font-family: var(--font-serif);
  font-size: 21px;
  font-weight: 800;
  color: var(--color-sand-light);
  margin-bottom: 6px;
}

.step-content-desc {
  font-size: 14px;
  line-height: 1.65;
  color: rgba(230, 211, 179, 0.8);
}

/* ========================================================
   5. API 区：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
   ======================================================== */
.api-section {
  max-width: 1400px;
  margin: 0 auto;
  padding: 80px 32px;
}

.code-terminal {
  max-width: 1080px;
  margin: 0 auto;
  background: #0A1726;
  border: 1px solid var(--color-depth-cyan);
  border-top: 2px solid var(--color-sand);
  border-radius: 2px;
  overflow: hidden;
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.6);
}

.code-terminal-header {
  background: #11263C;
  padding: 12px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid rgba(230, 211, 179, 0.2);
}

.code-dots {
  display: flex;
  gap: 8px;
}

.code-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #234E75;
}
.code-dot.sand { background: var(--color-sand); }

.code-title {
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--color-sand-light);
  font-weight: 700;
  letter-spacing: 1px;
}

.code-body {
  padding: 28px 32px;
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.8;
  color: var(--color-sand-light);
  white-space: pre;
  overflow-x: auto;
}

.code-comment  { color: #6F8FA8; font-style: italic; }
.code-keyword  { color: var(--color-depth-cyan); font-weight: bold; }
.code-string   { color: var(--color-sand); }
.code-function { color: #8FD4F2; }

/* ========================================================
   6. 影像区：四张横图
   - 只做展示，没有图注和点击
   ======================================================== */
.gallery-section {
  max-width: 1400px;
  margin: 0 auto;
  padding: 40px 32px 80px;
}

.gallery-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}

.gallery-img-wrapper {
  aspect-ratio: 16 / 10;
  overflow: hidden;
  border-radius: 2px;
  border: 1px solid rgba(230, 211, 179, 0.25);
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.4);
  background: #0E2033;
}

.gallery-img-wrapper img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  pointer-events: none; /* 纯展示，无点击交互 */
  transition: transform 0.4s ease;
}

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

/* ========================================================
   7. 页脚：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
   ======================================================== */
.footer-multi {
  background: #0B1A2B;
  border-top: 1px solid rgba(230, 211, 179, 0.25);
  padding: 72px 0 36px;
  color: rgba(230, 211, 179, 0.7);
}

.footer-inner {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 32px;
}

.footer-top-grid {
  display: grid;
  grid-template-columns: 2.2fr 1fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 56px;
}

.footer-brand-col {
  display: flex;
  flex-direction: column;
  padding-right: 24px;
}

.footer-logo {
  height: 38px;
  width: auto;
  margin-bottom: 20px;
  align-self: flex-start;
}

.footer-brand-desc {
  font-size: 14px;
  line-height: 1.7;
  color: rgba(230, 211, 179, 0.75);
  margin-bottom: 16px;
}

.footer-links-col h4 {
  font-family: var(--font-serif);
  font-size: 15.5px;
  font-weight: 800;
  color: var(--color-sand);
  margin-bottom: 18px;
  letter-spacing: 0.5px;
}

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

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

.footer-links-col a {
  font-size: 13.5px;
  color: rgba(230, 211, 179, 0.7);
  transition: color 0.2s ease;
}

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

.footer-bottom-line {
  border-top: 1px solid rgba(230, 211, 179, 0.15);
  padding-top: 24px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: 12px;
  color: rgba(230, 211, 179, 0.5);
  line-height: 1.6;
}

/* ========================================================
   响应式断点 (Responsive Rules)
   ======================================================== */
@media (max-width: 1024px) {
  .hero-main-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .hero-canvas-container {
    top: 40px;
    right: 50%;
    transform: translateX(50%);
    width: 440px;
    height: 440px;
    opacity: 0.45;
  }
  .capability-cards-grid {
    grid-template-columns: 1fr 1fr;
  }
  .metrics-strip {
    grid-template-columns: 1fr 1fr;
    gap: 20px;
  }
  .metric-item:nth-child(2)::after {
    display: none;
  }
  .footer-top-grid {
    grid-template-columns: 1fr 1fr;
  }
  .gallery-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .hero-title {
    font-size: 38px;
  }
  .hero-cards-grid {
    grid-template-columns: 1fr;
  }
  .capability-cards-grid {
    grid-template-columns: 1fr;
  }
  .metrics-strip {
    grid-template-columns: 1fr;
    gap: 16px;
  }
  .metric-item::after {
    display: none;
  }
  .process-step-item {
    grid-template-columns: 1fr;
    gap: 16px;
  }
  .step-num-box {
    border-right: none;
    border-bottom: 2px solid var(--color-depth-cyan);
    padding-bottom: 12px;
    flex-direction: row;
    gap: 12px;
  }
  .footer-top-grid {
    grid-template-columns: 1fr;
  }
  .gallery-grid {
    grid-template-columns: 1fr;
  }
}