/* ════════════════════════════════════════════════════════════
   DESIGN TOKENS — 与 style.css 保持一致
   ════════════════════════════════════════════════════════════ */
:root {
  /* paper bg — 纯白 + 微差灰白层次 */
  --paper:        #FFFFFF;
  --paper-2:      #F7F7F5;
  --paper-3:      #EFEFEC;
  --paper-dark:   #1A1A1A;

  /* 灰阶 grays */
  --ink:          #1A1A1A;
  --ink-2:        #3A3A38;
  --ink-3:        #5C5C58;
  --ink-4:        #8A8A82;
  --ink-5:        #B0B0A6;
  --gray-6:       #D0CFC4;
  --gray-7:       #E2E0D5;

  /* 主色蓝 — primary blue */
  --blue:         #002850;
  --blue-2:       #2A5F9E;
  --blue-3:       #3D72B0;
  --blue-4:       #5A8AC2;
  --blue-5:       #B5CADD;
  --blue-deep:    #14365E;
  --blue-6:       #002850;

  /* 同色系语义别名 */
  --structure:    var(--blue-6);
  --structure-2:  var(--blue-2);
  --growth:       var(--ink-3);
  --growth-2:     var(--ink-2);
  --bloom:        var(--blue);
  --bloom-2:      var(--blue-4);

  /* lines */
  --line:         rgba(26,26,26,0.12);
  --line-2:       rgba(26,26,26,0.22);
  --line-soft:    rgba(26,26,26,0.06);
  --blue-line:    rgba(29,78,137,0.18);
  --blue-soft:    rgba(29,78,137,0.08);

  /* dark section */
  --night:        #14181C;
  --night-2:      #1F252B;

  /* spacing */
  --gutter:       clamp(20px, 4vw, 64px);
  --section:      clamp(40px, 12vw, 80px);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; overflow-x: hidden; }
body {
  margin: 0;
  padding-top: 70px; /* 防止固定导航栏遮挡页面内容 */
  color: var(--ink);
  background: var(--paper);
  font-family: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  -webkit-font-smoothing: antialiased;
  line-height: 1.7;
  font-weight: 300;
  font-size: 15px;
  letter-spacing: 0.02em;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { display: block; width: 100%; }

.wrap { max-width: 1400px; margin: 0 auto; padding: 0 var(--gutter); position: relative; }

h1, h2, h3, p { margin-top: 0; }
h1 { font-size: clamp(52px, 10vw, 80px); line-height: 1.2; letter-spacing: -0.025em; color: var(--ink); margin-bottom: 28px; }
h2 { font-size: clamp(26px, 4.5vw, 56px); line-height: 1.2; letter-spacing: 0.04em; margin-bottom: 22px; }
h3 { font-size: 24px; line-height: 1.25; letter-spacing: -0.02em; }

.lead { font-size: clamp(16px, 2vw, 22px); line-height: 1.95; color: var(--ink-2); font-weight: 300; }
.small { font-size: 14px; line-height: 1.7; color: var(--ink-4); }

.section { padding: var(--section) 0; }
.section-tight { padding: clamp(50px, 8vw, 84px) 0; }

.grid { display: grid; gap: 24px; }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  min-height: 52px; padding: 0 24px; border-radius: 0;
  font-size: 14px; font-weight: 500; letter-spacing: 0.2em;
  border: 1px solid transparent;
  transition: all .3s;
}
.btn-primary { background: var(--structure); color: var(--paper); }
.btn-primary:hover { transform: translate(3px, -3px); box-shadow: -6px 6px 0 var(--ink); }
.btn-secondary { border-color: var(--line); background: var(--paper); }
.btn-secondary:hover { border-color: var(--ink); }

.tag { display: inline-flex; padding: 7px 11px; border-radius: 0; background: var(--paper-2); font-size: 12px; color: var(--ink-3); letter-spacing: 0.04em; }

.nav {
  position: fixed; top: 0; left: 0; width: 100%; z-index: 100;
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--line-soft);
}
.nav-inner {
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px var(--gutter);
  max-width: 1400px; margin: 0 auto;
}
.brand-mark {
  display: flex; align-items: baseline; gap: 6px;
}
.brand-en  { font-size: 18px; letter-spacing: 0.32em; color: var(--blue-6); font-weight: 600;}
.brand-cn  { font-size: 18px; letter-spacing: 0.15em; color: var(--blue-6); font-weight: 500;}

.nav-links {
  display: flex; gap: 36px; align-items: center;
  font-size: 13px; font-weight: 400;
  letter-spacing: 0.12em; color: var(--ink-2);
  margin-left: 40%;
}
.nav-links a { font-size: 13px; position: relative; padding: 6px 0; transition: color .3s; font-weight: 500; }
.nav-links a::after {
  content: ''; position: absolute; left: 0; right: 0; bottom: -2px;
  height: 1px; background: var(--ink); transform: scaleX(0); transform-origin: right;
  transition: transform .4s ease;
}
.nav-links a:hover { color: var(--ink); }
.nav-links a:hover::after { transform: scaleX(1); transform-origin: left; }

.nav-cta {
  background: var(--structure); color: var(--paper);
  padding: 10px 20px; border-radius: 0;
  font-size: 12px; font-weight: 500;
  letter-spacing: 0.2em;
  transition: all .3s; display: inline-flex; align-items: center; gap: 8px;
}
.nav-cta:hover { background: var(--structure); transform: translate(2px, -2px); box-shadow: -4px 4px 0 var(--ink); }
.nav-cta::after { content: '→'; }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 32px;
  height: 32px;
  padding: 6px;
  cursor: pointer;
  background: transparent;
  border: none;
  z-index: 110;
}
.nav-toggle span {
  width: 100%;
  height: 2px;
  background: var(--ink);
  transition: all .3s ease;
  border-radius: 1px;
}
.nav-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(7px, -6px); }

.mobile-nav {
  position: fixed;
  top: 70px;
  right: 0;
  transform: translateX(100%);
  width: 200px;
  max-height: calc(100vh - 90px);
  background: var(--paper);
  box-shadow: -4px 4px 20px rgba(26,26,26,0.15);
  border-radius: 8px 0 0 8px;
  z-index: 105;
  transition: transform .35s ease;
  will-change: transform;
  display: none;
  flex-direction: column;
}
.mobile-nav.active { transform: translateX(0); }

.mobile-nav-links {
  display: flex;
  flex-direction: column;
  padding: 16px;
  gap: 4px;
}
.mobile-nav-links a {
  padding: 16px 20px;
  font-size: 15px;
  font-weight: 400;
  letter-spacing: 0.12em;
  color: var(--ink-2);
  transition: all .25s;
  border-radius: 4px;
}
.mobile-nav-links a:hover {
  background: var(--paper-2);
  color: var(--ink);
}
.mobile-nav-cta {
  background: var(--structure);
  color: var(--paper) !important;
  margin-top: 16px;
  text-align: center;
}
.mobile-nav-cta:hover {
  background: var(--ink) !important;
}

/* ════════════════════════════════════════════════════════════
   HERO SECTION - 重构版
   解决布局冲突和响应式问题
   ════════════════════════════════════════════════════════════ */
.hero {
  position: relative;
  padding: clamp(40px, 10vw, 80px) ;
  display: flex;
  align-items: center;
  overflow: hidden;
}

.hero-content {
  display: grid;
  grid-template-columns: 7fr 3fr;
  gap: clamp(10px, 3vw, 30px);
  align-items: center;
  width: 100%;
}

.hero-main {
  display: flex;
  flex-direction: column;
  gap: 10px;
}


.hero-main h1 {
  margin-bottom: 0;
  font-weight: 700;
  font-size: clamp(25px, 5vw, 50px);
  max-width: 800px;
}

.hero-main .lead {
  max-width: 800px;
  margin-bottom: 0;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 8px;
}


.hero-aside {
  display: flex;
  justify-content: center;
}

/* 品牌卡片 - 使用flex替代固定高度 */
.brand-card {
  position: relative;
  background: var(--paper-2);
  border: 1px solid var(--line);
  border-radius: 0;
  padding: clamp(24px, 3vw, 30px);
  color: var(--ink);
  display: flex;
  flex-direction: column;
  gap: clamp(16px, 2vw, 20px);
  overflow: hidden;
  width: 100%;
  max-width: 500px;
  /* min-width: 400px; */
  min-height: 400px;
}

.brand-card::before {
  content: "";
  position: absolute;
  inset: -20%;
  filter: blur(20px);
  pointer-events: none;
}

.brand-card > * {
  position: relative;
  z-index: 1;
}

.brand-card-header {
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--ink);
  font-weight: 500;
}

.brand-card-body {
  flex: 1;
  display: flex;
  align-items: center;
}

.brand-card-body p {
  font-size: clamp(18px, 2vw, 24px);
  line-height: 1.3;
  margin: 0;
}

.brand-card-footer {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  border-top: 1px solid rgba(255, 255, 255, 0.25);
  padding-top: 20px;
}

.stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.stat strong {
  display: block;
  font-size: clamp(24px, 3vw, 32px);
  font-weight: 600;
  line-height: 1;
}

.stat span {
  font-size: 12px;
  color: var(--ink);
  letter-spacing: 0.04em;
}

.problem { 
  background: var(--paper-2);
  border-top: 1px solid var(--line);
  padding: var(--section) 0;
}
.problem-head { 
  display: grid; 
  grid-template-columns: 0.48fr 0.52fr; 
  gap: clamp(30px, 6vw, 80px); 
  align-items: end; 
  margin-bottom: 44px;
}
.problem-head h2 {
  font-weight: 600;
  font-size: clamp(24px, 4vw, 48px);
  letter-spacing: 0.04em;
  line-height: 1.2;
  margin-top: 16px;
  margin-bottom: 0px;
}
.problem-grid { grid-template-columns: repeat(4, 1fr); }
.problem-card {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 0;
  padding: clamp(15px, 3vw, 28px); 
  position: relative;
  transition: background .4s;
}
.problem-card:hover { background: var(--paper-2); }
.problem-no {
  font-size: clamp(12px, 2vw, 14px);
  letter-spacing: 0.2em; color:
  var(--ink-4);
  margin-bottom: 10px;
}
.problem-card h3 {
  font-weight: 600;
  font-size: clamp(20px, 2vw, 22px);
  letter-spacing: 0.08em;
  margin-bottom: 16px;
}
.problem-card p {
  color: var(--ink-2);
  font-weight: 300;
  font-size: clamp(14px, 2vw, 16px);
  line-height: 1.95; margin-bottom: 0; }

.works {
  padding: var(--section) 0;
  background: var(--paper);
  border-top: 1px solid var(--line);
}
.works-head { 
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: end;
  gap: 24px;
  margin-bottom: 32px;
  padding-bottom: 24px;
}
.works-head h2 {
  font-weight: 600;
  font-size: clamp(24px, 4vw, 48px);
  letter-spacing: 0.04em;
  line-height: 1.2;
  margin-top: 16px;
  margin-bottom: 0px;
}
.works-grid {
  display: grid;
  grid-template-columns: 5.7fr 4.3fr; /* 左侧 60%，右侧 40% */
  gap: 28px;
}

.case {
  position: relative;
  background: var(--paper-3);
  border: 1px solid var(--line);
  overflow: hidden;
  cursor: pointer;
  transition: transform .4s, box-shadow .4s;
  min-height: 670px; /* 参考 /new/preview.html：图片作为背景层 */
  color: #fff;
}
.case:hover { transform: translateY(-6px); box-shadow: 0 16px 40px rgba(26,26,26,0.1); }

/* 底部黑色渐变蒙版 — 保证白色文字在浅色图片上可读 */
.case::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background: linear-gradient(180deg, transparent 38%, rgba(0,0,0,0.82) 100%);
  pointer-events: none;
}

.case img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
  transition: transform .5s ease;
}
.case:hover img { transform: scale(1.03); }

/* 文字浮层 — 位于图片内部底部 */
.case-copy {
  position: absolute;
  left: 30px;
  right: 30px;
  bottom: 28px;
  z-index: 2;
  display: flex; flex-direction: column; gap: 6px;
}
.case-copy h3 { color: #fff; font-weight: 600; font-size: 17px; letter-spacing: 0.06em; margin-bottom: 8px; }
.case-tags { display: flex; gap: 6px; flex-wrap: wrap; }
.case-tags span {
  font-size: 11px;
  letter-spacing: 0.04em;
  color: #fff;
  padding: 6px 10px;
  border-radius: 999px;
  background: rgba(255,255,255,0.16);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}
.case-stack { 
    display: grid; 
    gap: 28px; 
    grid-template-rows: 5.7fr 4.3fr; /* 60:40 比例 */
}
.case-small { min-height: 238px; } /* 右侧小卡缩略高度 */

.result { 
  background: var(--paper-2); 
  color: var(--ink);
  border-top: 1px solid var(--line);
  padding: var(--section) 0;
}
.result-grid { grid-template-columns: 1.2fr 2fr; gap: clamp(40px, 6vw, 100px); align-items: start; }
.result h2 {
  font-weight: 600;
  font-size: clamp(24px, 4vw, 48px);
  letter-spacing: 0.04em;
  line-height: 1.2;
  color: var(--ink);
  margin-top: 16px;
  margin-bottom: 24px;
}
.result-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.result-item { border: 1px solid var(--line); background: rgba(255, 255, 255, 0.05); padding: 30px; min-height: auto; position: relative; transition: background .35s; }
.result-item:hover { background: var(--paper); }
.result-item b {
  display: block;
  font-size: clamp(16px, 4vw, 20px);
  line-height: 1;
  color: var(--ink-4);
  font-weight: 200;
  letter-spacing: -0.04em;
  margin-bottom: 24px;
  transition: color .35s;
}
.result-item:hover b { color: var(--blue); }
.result-item h3 {
  font-weight: 600;
  font-size: clamp(20px, 2vw, 22px);
  letter-spacing: 0.08em;
  margin-bottom: 16px;
}
.result-item p {
  color: var(--ink-2);
  font-weight: 300;
  font-size: clamp(14px, 2vw, 16px);
  line-height: 1.95; margin-bottom: 0; }

.method {
  padding: var(--section) 0;
  border-top: 1px solid var(--line);
}
.method-head {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: clamp(30px, 6vw, 80px);
  align-items: end;
  margin-bottom: 40px;
}
.method-head h2 {
  font-weight: 600;
  font-size: clamp(24px, 4vw, 48px);
  letter-spacing: 0.04em;
  line-height: 1.2;
  color: var(--ink);
  margin-top: 16px;
  margin-bottom: 0px;
}
.six-grid {
  grid-template-columns: repeat(6, 1fr);
  display: grid;
}
.six {
  padding: 20px 36px 20px;
  border-right: 1px solid var(--line);
  position: relative;
  transition: background .4s;
}
.six:last-child { border-right: none; }
.six:hover { background: var(--paper-2); }
.six .cn { font-size: 22px; font-weight: 600; letter-spacing: 0.08em; margin-bottom: 8px; }
.six .en { font-size: 16px; color: var(--ink-3); letter-spacing: 0.05em; margin-bottom: 16px; }
.six p { font-size: 16px; line-height: 1.95; color: var(--ink-2); font-weight: 300; }

.grow-box {
  margin-top: 44px;
  background: var(--paper-2);
  padding: 42px;
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 50px;
  align-items: center;
}
.grow-box h2 {
  font-weight: 600;
  font-size: clamp(20px, 4vw, 40px);
  letter-spacing: 0.04em;
  line-height: 1.2;
  margin-top: 16px;
  margin-bottom: 16px;
}
.grow-box .lead {
  font-size: clamp(16px, 1.8vw, 22px);
  color: var(--ink-3);
  letter-spacing: 0.06em;
  margin-bottom: 24px;
}
.grow-line { display: grid; grid-template-columns: repeat(5, 1fr); grid-template-rows: repeat(2, 1fr); gap: 20px; }
.grow-node {
  padding: 20px 16px 10px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 16px;
  position: relative;
  text-align: center;
}
.grow-node b { font-weight: 700; font-size: 20px; letter-spacing: 0.18em; }
.grow-node p { font-size: 12px; color: var(--ink-3); margin-top: 4px; line-height: 1.5; font-weight: 300; }
.grow-box .btn {
  display: inline-flex; align-items: center; gap: 16px;
  padding: 22px 40px;
  background: var(--structure);
  color: var(--paper);
  font-size: 15px;
  font-weight: 500;
  letter-spacing: 0.3em;
  transition: all .35s;
  margin-top: 10px;
}
.grow-box .btn:hover { transform: translate(4px, -4px); box-shadow: -8px 8px 0 var(--ink); }

.service { 
  background: var(--paper-2);
  border-top: 1px solid var(--line);
  padding: var(--section) 0;
}
.service-head {
  display: grid;
  grid-template-columns: 0.48fr 0.52fr;
  gap: clamp(30px, 6vw, 80px);
  align-items: end;
  margin-bottom: 44px;
}
.service-head h2 {
  font-weight: 600;
  font-size: clamp(24px, 4vw, 48px);
  letter-spacing: 0.04em;
  line-height: 1.2;
  margin-top: 16px;
  margin-bottom: 0px;
}

.service-list {
  margin: 22px 0 28px;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}
.service-list li {
  font-size: 14px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
}
.featured .service-list li {
  border-color: rgba(255, 255, 255, 0.25);
}

/* ════════════════════════════════════════════════════════════
   SERVICE 区域 — 水平 3 列卡片布局（替代原垂直列表）
   ════════════════════════════════════════════════════════════ */
.service-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  align-items: stretch;
}

.service-card {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 0;
  padding: clamp(28px, 3vw, 40px);
  display: flex;
  flex-direction: column;
  gap: 10px;
  position: relative;
  transition: transform .4s, box-shadow .4s, background .4s;
  min-height: 400px;
}

.service-card:hover { background: var(--paper-2); }


/* kicker 编号 */
.service-kicker {
  font-size: 14px;
  letter-spacing: 0.2em;
  color: var(--ink-4);
}

/* 卡片标题 */
.service-card-title {
  font-weight: 600;
  font-size: 26px;
  letter-spacing: 0.06em;
  line-height: 1.3;
  margin: 0;
  color: var(--ink);
}

/* 卡片描述 */
.service-card-desc {
  font-size: 15px;
  color: var(--ink-3);
  font-weight: 500;
  line-height: 1.85;
  margin: 0;
}

/* 卡片特性列表 */
.service-card-list {
  list-style: none;
  margin: 0;
  padding: 10px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  gap: 10px;
  flex: 1;
}

.service-card-list li {
  font-size: 14px;
  font-weight: 500;
  line-height: 1.7;
  color: var(--ink-2);
  padding-left: 20px;
  position: relative;
}

.service-card-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 11px;
  width: 10px;
  height: 1px;
  background: var(--blue);
}


/* 卡片底部：时长 + 按钮 */
.service-card-foot {
  display: flex;
  flex-direction: column;
  gap: 16px;
  align-items: flex-start;
  margin-top: auto;
  padding-top: 4px;
}

.service-card-duration {
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--ink-4);
  font-weight: 500;
}


.ai {
  background: var(--paper);
  border-top: 1px solid var(--line);
  padding: var(--section) 0;
}
.ai-box {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(40px, 6vw, 100px);
  align-items: start;
  background: var(--paper-2);
  color: var(--ink);
  border-radius: 0;
  padding: clamp(30px, 4vw, 40px);
  border: none;
}
.ai-box h2 {
  font-weight: 600;
  font-size: clamp(24px, 4vw, 48px);
  letter-spacing: 0.04em;
  line-height: 1.2;
  color: var(--ink);
  margin-top: 16px;
  margin-bottom: 24px;
}
.ai-box .lead {
  font-size: clamp(16px, 1.8vw, 22px);
  color: var(--ink-3);
  letter-spacing: 0.06em;
  line-height: 1.95;
}
.hubs {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}
.hub {
  border: 1px solid var(--line);
  border-radius: 0;
  padding: clamp(16px, 2vw, 24px);
  position: relative;
  transition: background .35s;
}
.hub:hover { background: var(--paper); }
.hub b {
  display: block;
  font-weight: 600; 
  font-size: clamp(16px, 2vw, 20px);
  letter-spacing: 0.06em;
  margin-bottom: 6px;
}
.hub span {
  font-size: clamp(14px, 2vw, 16px);
  color: var(--ink-2);
  font-weight: 300;
  line-height: 1.95;
}
.process {
  padding: var(--section) 0;
  padding-top: 0;   
  background: var(--paper);
}
.process-head {
  display: grid;
  grid-template-columns: 0.48fr 0.52fr;
  gap: clamp(30px, 6vw, 80px);
  align-items: end;
  margin-bottom: 44px;
}
.process-head h2 {
  font-weight: 600;
  font-size: clamp(24px, 4vw, 48px);
  letter-spacing: 0.04em;
  line-height: 1.2;
  margin-top: 16px;
  margin-bottom: 0px;
}
.process-head h2 em { font-style: normal; color: var(--growth); font-weight: 400; }

.process-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.process-step {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 28px;
  border: 1px solid var(--line);
  background: var(--paper);
  position: relative;
  transition: background .3s, box-shadow .3s;
}
.process-step:hover { background: var(--paper-2); }
.step-num { display: flex; flex-direction: row; gap: 4px; font-size: clamp(12px, 2vw, 16px); letter-spacing: 0.2em; color: var(--ink-4);}
.step-body { display: flex; flex-direction: column;}
.step-title { font-weight: 600; font-size: clamp(20px, 2vw, 22px); letter-spacing: 0.08em; }
.step-desc { font-size: clamp(14px, 2vw, 16px); color: var(--ink-2); line-height: 1.85; font-weight: 300; margin-top: 4px; }
.insights { 
  background: var(--paper-2);
  border-top: 1px solid var(--line);
  padding: var(--section) 0;
}
.insights-head {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: end;
  gap: 24px;
  margin-bottom: 20px;
  padding-bottom: 28px;
}
.insights-title-cn {
  font-weight: 600;
  font-size: clamp(24px, 4vw, 48px);
  letter-spacing: 0.04em;
  line-height: 1.2;
  color: var(--ink);
  margin-top: 16px;
  margin-bottom: 0px;
}
.insight-grid { grid-template-columns: repeat(3, 1fr); gap: 28px; }
.article {
  border: 1px solid var(--line);
  padding: 32px;
  display: flex;
  flex-direction: column;
  transition: transform .4s, box-shadow .4s;
  cursor: pointer;
}
.article:hover { background: var(--paper); }
.article .date { font-size: 11px; letter-spacing: 0.12em; color: var(--ink); }
.article h3 { font-weight: 600; font-size: 19px; letter-spacing: 0.06em; color: var(--ink); margin: 16px 0; line-height: 1.4; }
.article p { font-size: 13px; line-height: 1.85; color: var(--ink-2); font-weight: 300; margin: 0 0 auto 0; }
.article .more { 
  display: inline-flex; align-items: center; gap: 14px;
  font-size: 13px; letter-spacing: 0.05em;
  color: var(--ink-3); margin-top: 20px;
  padding-bottom: 4px; border-bottom: 1px solid var(--line-2);
  transition: color .3s, border-color .3s, gap .3s;
}
.article:hover .more { color: var(--ink); border-color: var(--ink); gap: 20px; }


.footer {
  background: var(--blue);
  color: var(--paper);
  padding: var(--section) 0;
  position: relative;
}
/* Footer布局 - flex结构：brand | contact | practice */
.footer-grid {
  display: flex;
  flex-direction: row;
  justify-content: space-between;
  gap: clamp(32px, 5vw, 64px);
  margin-bottom: 40px;
  flex-wrap: wrap;
}
.footer-brand-name {
  letter-spacing: 0.15em;
  font-size: 28px;
  font-weight: 500;
  color: var(--paper);
  margin-bottom: 6px;
  line-height: 1.3;
}
.footer-brand-name .footer-brand-en {
  font-size: 28px;
  font-weight: 600;
  color: var(--paper);
  letter-spacing: 0.32em;
}
.footer-brand p {
  font-size: 15px;
  line-height: 1.8;
  color: rgba(255,255,255,0.8);
  max-width: 360px;
  margin: 0;
}
.footer-brand-cn {
  font-weight: 700;
  font-size: 28px; letter-spacing: 0.2em;
  margin-bottom: 6px;
  color: var(--paper);
  text-decoration: none;
  display: block;
  cursor: pointer;
}
.footer-brand-en {
  font-size: 16px; letter-spacing: 0.3em;
  color: rgba(255,255,255,0.5); margin-bottom: 28px;
}
.footer-tagline {
  font-size: 16px; color: rgba(255,255,255,0.9);
  letter-spacing: 0.04em; line-height: 1.8;
  max-width: 360px;
}


/* footer-col 文字内容区域 */
.footer-col-content {
  display: flex;
  flex-direction: column;
}

/* footer-col 主体横向排列 - 二维码与文字列表并排 */
.footer-col-body {
  display: flex;
  flex-direction: row;
  align-items: flex-start;
  gap: 20px;
}

/* 二维码列样式 - 在 footer-col-body 内部左侧竖直排列 */
.footer-qrcode-col {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 14px;
  flex-shrink: 0;
  padding-top: 4px;
}

/* 带二维码的列标题左侧偏移，与文字列表对齐 */
.footer-col-content h4 {
  padding-left: 174px;
}

.footer-col h4 {
  font-size: 14px;
  color: rgba(255,255,255,0.8);
  letter-spacing: 0.18em;
  margin-top: 10px;
  margin-bottom: 10px;
  font-weight: 500;
}
.footer-col ul { list-style: none; padding: 0; margin: 0; }
.footer-col ul li {
  margin-bottom: 8px;
  font-size: 14px;
  color: rgba(255,255,255,0.6);  
  font-weight: 500;
  letter-spacing: 0.02em;
}
.footer-col a { 
  color: rgba(255,255,255,0.6); 
  transition: color .25s; 
}
.footer-col a:hover { color: var(--paper); }



.footer-bot {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 24px;
  display: flex; justify-content: space-between;
  flex-wrap: wrap; gap: 12px;
  font-family: var(--sans-cn); font-size: 12px; color: rgba(255,255,255,0.4);
  letter-spacing: 0.06em;
}
.footer-sitemap {
  margin-left: auto;
  margin-right: 100px;
}

/* 二维码样式 */
.footer-qrcode {
  display: flex;
  gap: 20px;
  margin-top: 16px;
}
.footer-qrcode .qrcode-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}
.footer-qrcode .qrcode-item img {
  border-radius: 4px;
  background: #fff;
  padding: 4px;
}
.footer-qrcode .qrcode-item span {
  font-family: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  font-size: 11px;
  color: rgba(255,255,255,0.55);
  letter-spacing: 0.04em;
}

/* ════════════════════════════════════════════════════════════
   HERO SLIDER
   ════════════════════════════════════════════════════════════ */
.hero-slider {
  position: relative;
  width: 100vw;
  aspect-ratio: 2000 / 1000;
  overflow: hidden;
  background: var(--paper-2);
  margin-left: calc(-50vw + 50%);
  margin-right: calc(-50vw + 50%);
}

.slider-track {
  position: relative;
  width: 100%;
  height: 100%;
}

.slider-slide {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.6s ease-in-out, visibility 0.6s ease-in-out;
}

.slider-slide.active {
  opacity: 1;
  visibility: visible;
}

.slider-link {
  display: block;
  width: 100%;
  height: 100%;
}

.slider-image {
  width: 100%;
  height: 100%;
  margin: 0;
}

.slider-image img,
.slider-image source {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.slider-content {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(
    to bottom,
    rgba(26, 26, 26, 0.3) 0%,
    rgba(26, 26, 26, 0.1) 50%,
    rgba(26, 26, 26, 0.4) 100%
  );
  pointer-events: none;
}

.slider-content-inner {
  text-align: center;
  padding: 0 var(--gutter);
  max-width: 900px;
}

.slider-title {
  font-family: var(--sans-cn);
  font-size: clamp(32px, 5vw, 56px);
  font-weight: 600;
  color: var(--paper);
  margin: 0 0 16px;
  letter-spacing: 0.05em;
  text-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

.slider-subtitle {
  font-size: clamp(16px, 2vw, 24px);
  font-weight: 400;
  color: var(--paper);
  margin: 0;
  letter-spacing: 0.08em;
  opacity: 0.9;
  text-shadow: 0 1px 4px rgba(0, 0, 0, 0.3);
}

/* Slider Navigation Buttons */
.slider-prev,
.slider-next {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 10;
  width: 50px;
  height: 50px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.3s ease;
  background: transparent;
  border: none;
}

.slider-prev { left: 24px; }
.slider-next { right: 24px; }

.slider-prev svg,
.slider-next svg {
  width: 50px;
  height: 50px;
}

/* Slider Dots */
.slider-dots {
  position: absolute;
  bottom: 2px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 10;
  display: flex;
  gap: 12px;
  padding: 8px 16px;
}

.slider-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--ink-4);
  border: none;
  cursor: pointer;
  transition: all 0.3s ease;
  padding: 0;
}

.slider-dot:hover {
  background: var(--ink-2);
}

.slider-dot.active {
  background: var(--blue);
  width: 6px;
  border-radius: 6px;
}

/* ════════════════════════════════════════════════════════════
   RESPONSIVE
   ════════════════════════════════════════════════════════════ */
@media (max-width: 980px) {
  .grow-box {
    grid-template-columns: 1fr;
  }
  .grow-line { grid-template-columns: repeat(4, 1fr); grid-template-rows: auto; }
  .service-grid { grid-template-columns: 1fr; gap: 20px; }
}

@media (max-width: 800px) {
  body { padding-top: 70px; }
  .nav-links { display: none; }
  .nav-cta { display: none; }
  .nav-toggle { display: flex; }
  .mobile-nav { display: flex; }
}

@media (max-width: 768px) {
  .hero { min-height: auto; }
  .hero-content {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .hero-main {
    gap: 20px;
  }
  .hero-main .lead {
    max-width: 100%;
  }
  .hero-aside {
    order: 2;
  }
  .brand-card {
    min-height: auto;
    padding: clamp(24px, 4vw, 32px);
  }
  .brand-card-body p {
    font-size: clamp(20px, 2vw, 28px);
  }
  .brand-card-footer {
    gap: 12px;
    padding-top: 16px;
  }
  .stat strong {
    font-size: clamp(20px, 2.5vw, 26px);
  }
  
  .problem-head { grid-template-columns: 1fr; }
  .problem-head h2 { font-weight: 600; font-size: clamp(24px, 4vw, 48px); letter-spacing: 0.04em; line-height: 1.2; margin-top: 16px; margin-bottom: 0px; }
  .method-head { grid-template-columns: 1fr; }
  .problem-grid { grid-template-columns: repeat(2, 1fr); }
  .problem-card {border-bottom: 1px solid var(--line); }
  .problem-card:nth-child(2n) { border-right: 1px solid var(--line); }
  
  .works-head { grid-template-columns: 1fr; }
  .works-head h2 { font-weight: 600; font-size: clamp(24px, 4vw, 48px); letter-spacing: 0.04em; line-height: 1.2; margin-top: 16px; margin-bottom: 0px; }

  .process-grid { grid-template-columns: 1fr; }
  .process-head { grid-template-columns: 1fr; }
  .insights-head { grid-template-columns: 1fr; }
  
  .result-grid { grid-template-columns: 1fr; }
  .result-list { grid-template-columns: 1fr; }

  .six-grid { grid-template-columns: repeat(3, 1fr); }
  .six { border-right: none; border-bottom: 1px solid var(--line); }

  
  .grow-box .btn { padding: 16px 28px; font-size: 14px; }
  .grow-line { grid-template-columns: repeat(3, 1fr); }
  .grow-node b { font-size: 18px; }
  .grow-node { padding: 16px 12px 20px; }
  
  .service-head { grid-template-columns: 1fr; }
  .service-card { min-height: auto; padding: 28px 24px; }
  .service-card-title { font-size: 22px; }
  
  .ai-box {
    grid-template-columns: 1fr;
    padding: clamp(30px, 5vw, 40px);
  }
  .hubs { grid-template-columns: 1fr; }
  
  .process-steps { grid-template-columns: 1fr; }

  .insights-title-cn { font-weight: 600; font-size: clamp(24px, 4vw, 48px); letter-spacing: 0.04em; line-height: 1.2; margin-top: 16px; margin-bottom: 0px; }

  /* 平板端footer布局 - 两行两列 */
  .footer-grid { flex-wrap: wrap; gap: 32px; }
  .footer-qrcode-col { flex-direction: row; justify-content: flex-start; }
  .footer-col-body { flex-direction: row; }
  .footer-brand { border-bottom: none; padding-bottom: 0; }
  
  .slider-prev, .slider-next { width: 40px; height: 40px; }
}

@media (max-width: 768px) {
  .slider-prev,
  .slider-next {
    width: 40px;
    height: 40px;
  }

  .slider-prev { left: 12px; }
  .slider-next { right: 12px; }

  .six-grid { grid-template-columns: repeat(2, 1fr); }

  .slider-prev svg,
  .slider-next svg {  
    width: 20px;
    height: 20px;
  }

  .slider-dots {
    bottom: 2px;
    gap: 8px;
    padding: 5px 10px;
  }

  .slider-dot {
    width: 6px;
    height: 6px;
  }

  .slider-dot.active {
    width: 6px;
  }

  .slider-title {
    font-size: clamp(24px, 4vw, 36px);
  }

  .slider-subtitle {
    font-size: clamp(14px, 1.8vw, 18px);
  }
}

@media (max-width: 640px) {
  .wrap { padding: 0 clamp(14px, 4vw, 28px); }
  .section { padding: clamp(50px, 8vw, 82px) 0; }
  .section-tight { padding: clamp(40px, 6vw, 64px) 0; }
  .nav-inner { padding: 14px clamp(14px, 4vw, 28px); }

  /* Hero 响应式优化 */
  .hero {
    padding: clamp(40px, 8vw, 80px) 0;
  }
  .hero-content {
    gap: 32px;
  }
  .hero-main {
    gap: 16px;
  }
  h1 {
    font-size: clamp(36px, 8vw, 56px);
  }
  .hero-actions {
    gap: 12px;
  }

  /* 品牌卡片移动端样式 */
  .brand-card {
    padding: 24px;
  }
  .brand-card-body p {
    font-size: 20px;
  }
  .brand-card-footer {
    gap: 12px;
  }
  .stat strong {
    font-size: 22px;
  }
  
  .problem-grid { grid-template-columns: 1fr; }
  
  .works-grid { grid-template-columns: 1fr; gap: 20px; }
  .case-stack { grid-template-rows: auto auto; gap: 20px; }
  .case { min-height: 300px; }
  .case-small { min-height: 280px; }

  .result-list { grid-template-columns: 1fr; }
  
  .six-grid { grid-template-columns: repeat(2, 1fr); }
  .six:nth-child(3n) { border-right: none; }

  
  .grow-box .btn { padding: 14px 24px; font-size: 13px; }
  .grow-line { grid-template-columns: repeat(2, 1fr); gap: 10px; }
  .grow-node b { font-size: 17px; }
  .grow-node span { font-size: 12px; }
  .grow-node p { font-size: 11px; }
  .grow-node { padding: 14px 10px 18px; }
  
  .service-card { padding: 20px 20px; gap: 10px; }
  .service-card-title { font-size: 20px; }
  .service-card-list li { font-size: 13px; }
  
  .hubs { grid-template-columns: 1fr; }
  
  .process-steps { grid-template-columns: 1fr; }
  .process-step { padding: 22px; }

  .insight-grid { grid-template-columns: 1fr; }

  /* 移动端footer布局 - 单列垂直排列 */
  .footer-grid { flex-direction: column; }
  .footer-qrcode-col { flex-direction: column; align-items: center; }
  .footer-col-body { flex-direction: column; align-items: center; }

  .slider-prev, .slider-next { width: 32px; height: 32px; }
  .slider-prev { left: 10px; }
  .slider-next { right: 10px; }
}

@media (max-width: 430px) {
  .hero-content { gap: 0px; }
  .hero-aside { padding-top: 20px; }

  .problem-head { gap: 0px; margin-bottom: 0px;}
  .problem-head h2 { margin-bottom: 10px; }

  .problem-grid { gap: 10px; }
  .problem-no { margin-bottom: 10px; }
  .problem-card h3 { margin-bottom: 10px; }

  .works-head { gap: 10px; margin-bottom: 0px; padding-bottom: 16px; }
  .works-head .btn-primary { max-width: 150px; min-height: 36px; padding: 0 16px; font-size: 12px; }

  .result-item { padding: 10px 20px; }
  .result-item b { margin-bottom: 10px; }
  .result-item h3 { margin-bottom: 10px; }
  .result-item p { margin-bottom: 0px; }

  .grow-box { gap: 20px; padding: 20px; }
  .grow-box h2 { margin-bottom: 10px;}
  .grow-box .lead { margin-bottom: 3px;}

  .six { padding: 10px 10px; }
  .six .cn { font-size: 20px; }
  .six .en { margin-bottom: 10px; }
  .six p { margin-bottom: 0px; }

  /* wrap 所在 section 上下间距进一步缩小 */
  .section { padding: clamp(36px, 8vw, 56px) 0; }
  /* result 标题块与 result-list 之间的间距缩小 */
  .result-grid { gap: 10px; }
  .result h2 { margin-bottom: 10px; }
  .result p { margin-bottom: 6px; }

  .method-head { gap: 20px; margin-bottom: 10px;}
  .method-head h2 { margin-bottom: 0px; }
  .method-head .lead { margin-bottom: 0px; }

  /* service 头部与卡片网格之间的间距缩小 */
  .service-head { margin-bottom: 36px; }
  .service-grid { gap: 16px; }
  .service-card-list { padding-bottom: 8px;padding-top: 8px; gap: 2px; }
  .service-card-foot { gap: 10px; padding-top: 4px; }

  .service-head { gap: 10px; margin-bottom: 10px;}

  .ai-box { gap: 10px; padding: 20px; padding-top: 30px; padding-bottom: 30px;}
  .ai-box h2{ margin-bottom: 10px; }
  .ai-box .lead { margin-bottom: 5px;}

  .process-head { margin-bottom: 10px; gap: 10px; }
  .process-head h2 { margin-top: 16px; margin-bottom: 0px; }
  .process-steps { gap: 10px; }
  .process-step { gap: 5px; padding: 20px; }

  .insights-head { gap: 10px; margin-bottom: 10px; padding-bottom: 10px; }
  .insights-head .btn-primary { max-width: 150px; min-height: 36px; padding: 0 16px; font-size: 12px; }
  .article { padding: 20px; }
  .article h3 { margin: 10px 0;}
  .article .more { gap: 14px; margin-top: 10px; padding-bottom: 4px; }

  .footer-brand-name { margin-bottom: 8px; }
  .footer-col h4 { margin-top: 10px;  margin-bottom: 10px; }
}