/* ==========================================================
   万禾科技集团 - APP开发业务落地页（浅色版）
   PC / 移动自适应
   ========================================================== */

:root {
  /* 品牌色取自 logo.png 实际像素采样：#315A95 主蓝 + #FF9914 点缀橙 */
  --primary: #315a95;
  --primary-dark: #24467a;
  --primary-rgb: 49, 90, 149;
  /* 渐变的浅色一端（同色系提亮，保证按钮渐变仍有层次） */
  --cyan: #4e8bc9;
  --cyan-rgb: 78, 139, 201;
  --accent: #ff9914;
  --navy: #14294e;
  --text: #24334f;
  --text-light: #67748e;
  --bg: #ffffff;
  --bg-soft: #f4f7fc;
  --border: #e3eaf5;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(20, 41, 78, 0.08);
  --shadow-hover: 0 18px 44px rgba(var(--primary-rgb), 0.16);
  --font: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { text-decoration: none; color: inherit; }
ul, ol { list-style: none; }
button { font-family: inherit; cursor: pointer; }

.container { width: min(1200px, 92%); margin: 0 auto; }

/* ---------- 浅色底纹背景 ---------- */
.bg-dots {
  background-color: var(--bg);
  background-image: radial-gradient(rgba(var(--primary-rgb), 0.075) 1.5px, transparent 1.5px);
  background-size: 26px 26px;
}
.bg-diag {
  background-color: var(--bg-soft);
  background-image: repeating-linear-gradient(45deg,
    rgba(var(--primary-rgb), 0.045) 0 1px, transparent 1px 16px);
}
.bg-grid {
  background-color: var(--bg-soft);
  background-image:
    linear-gradient(rgba(var(--primary-rgb), 0.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(var(--primary-rgb), 0.055) 1px, transparent 1px);
  background-size: 36px 36px;
}

/* ---------- 通用 ---------- */
.section { padding: 88px 0; }
.section-head { text-align: center; max-width: 820px; margin: 0 auto 56px; }
.section-eyebrow {
  font-size: 13px; letter-spacing: 4px; font-weight: 700;
  color: var(--primary); text-transform: uppercase; margin-bottom: 10px;
}
.section-title { font-size: clamp(26px, 3.4vw, 38px); font-weight: 800; color: var(--navy); }
.section-title.left { text-align: left; }
.section-desc { color: var(--text-light); margin-top: 16px; font-size: 15px; }
.text-gradient {
  background: linear-gradient(90deg, var(--primary-dark), var(--cyan));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}

.btn {
  display: inline-block; padding: 13px 32px; border-radius: 999px;
  font-size: 15px; font-weight: 600; border: 2px solid transparent;
  transition: all .25s ease; text-align: center;
}
.btn-primary, .btn-light {
  background: linear-gradient(90deg, var(--primary), var(--cyan)); color: #fff;
  box-shadow: 0 8px 20px rgba(var(--primary-rgb), .28);
}
.btn-primary:hover, .btn-light:hover { transform: translateY(-2px); box-shadow: 0 12px 26px rgba(var(--primary-rgb), .38); }
.btn-outline { border-color: var(--primary); color: var(--primary); background: rgba(255,255,255,.7); }
.btn-outline:hover { background: var(--primary); color: #fff; }
.btn-block { width: 100%; }

/* ---------- 顶部通栏 ---------- */
.topbar {
  background: #eaf1fc; color: var(--text-light);
  font-size: 12.5px; padding: 7px 0;
  border-bottom: 1px solid var(--border);
}
.topbar-inner { display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.topbar a { color: var(--primary); font-weight: 700; }

/* ---------- 导航 ---------- */
.header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,.94); backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border); transition: box-shadow .3s;
}
.header.scrolled { box-shadow: 0 6px 20px rgba(20,41,78,.08); }
.header-inner { display: flex; align-items: center; gap: 28px; height: 72px; }
.logo { display: flex; align-items: center; gap: 10px; }
.logo-img {
  display: block; height: 42px; width: auto; max-width: 100%;
  -o-object-fit: contain; object-fit: contain;
}
.logo-img-footer { height: 40px; }
.logo-mark {
  width: 42px; height: 42px; border-radius: 10px; flex: none;
  background: linear-gradient(135deg, var(--primary), var(--cyan));
  color: #fff; font-weight: 800; font-size: 15px;
  display: flex; align-items: center; justify-content: center;
}
.logo-text { font-weight: 800; font-size: 18px; color: var(--navy); line-height: 1.2; display: flex; flex-direction: column; }
.logo-text small { font-size: 10px; font-weight: 500; letter-spacing: 1.5px; color: var(--text-light); }
.nav { display: flex; gap: 6px; margin-left: auto; }
.nav a {
  padding: 8px 16px; border-radius: 8px; font-size: 15px; font-weight: 500;
  color: var(--text); transition: all .2s;
}
.nav a:hover, .nav a.active { color: var(--primary); background: rgba(var(--primary-rgb), .08); }
.header-cta { padding: 9px 24px; font-size: 14px; }
.nav-toggle { display: none; background: none; border: 0; width: 40px; height: 40px; flex-direction: column; justify-content: center; align-items: center; gap: 5px; margin-left: auto; }
.nav-toggle span { width: 22px; height: 2.5px; background: var(--navy); border-radius: 2px; transition: all .3s; }

/* ---------- 首屏轮播（修复：全部层叠+纯透明度过渡，无定位跳动） ---------- */
.hero { position: relative; }
.hero-carousel { position: relative; height: min(640px, 78vh); overflow: hidden; isolation: isolate; }
.hero-slide {
  position: absolute; inset: 0;
  background-size: cover; background-position: center right;
  opacity: 0; visibility: hidden; z-index: 0;
  pointer-events: none;
  transition: opacity 1s ease, visibility 1s ease;
  will-change: opacity;
  display: flex; align-items: center;
}
.hero-slide.active { opacity: 1; visibility: visible; z-index: 1; pointer-events: auto; }
.hero-slide.active .hero-content { animation: slideUp .8s ease both; }
@keyframes slideUp {
  from { opacity: 0; transform: translateY(26px); }
  to { opacity: 1; transform: translateY(0); }
}
/* 浅色遮罩：左侧白色渐隐，保证深色标题可读 */
.hero-mask {
  position: absolute; inset: 0;
  background: linear-gradient(90deg,
    rgba(255,255,255,.97) 0%, 
	rgba(255,255,255,.89) 32%,
    rgba(255,255,255,.38) 58%, 
	rgba(255,255,255,.03) 85%, 
	rgba(255,255,255,0) 100%);
}
.hero-mask1 {
  position: absolute; inset: 0;
  background: linear-gradient(90deg,
    rgba(255,255,255,.97) 0%, rgba(255,255,255,.92) 32%,
    rgba(255,255,255,.55) 58%, rgba(255,255,255,.08) 85%, rgba(255,255,255,0) 100%);
}
.hero-content { position: relative; z-index: 2; color: var(--navy); max-width: 1200px; }
.hero-tag {
  display: inline-block; font-size: 13px; letter-spacing: 3px; font-weight: 700;
  color: var(--primary); border: 1px solid rgba(var(--primary-rgb), .35); border-radius: 999px;
  padding: 5px 16px; margin-bottom: 22px; background: rgba(var(--primary-rgb), .06);
}
.hero-content h1 { font-size: clamp(30px, 5vw, 54px); font-weight: 900; line-height: 1.25; letter-spacing: 1px; }
.hero-sub { margin-top: 14px; font-size: clamp(15px, 1.8vw, 19px); font-weight: 700; color: #33456b; }
.hero-desc { margin-top: 12px; font-size: 14.5px; color: var(--text-light); max-width: 540px; }
.hero-btns { margin-top: 32px; display: flex; gap: 14px; flex-wrap: wrap; }
.hero-dots {
  position: absolute; bottom: 26px; left: 50%; transform: translateX(-50%);
  display: flex; gap: 10px; z-index: 5;
}
.hero-dots button {
  width: 34px; height: 5px; border: 0; border-radius: 999px;
  background: rgba(20,41,78,.22); transition: all .3s;
}
.hero-dots button.active { background: var(--primary); width: 52px; }
.hero-arrow {
  position: absolute; top: 50%; transform: translateY(-50%); z-index: 5;
  width: 46px; height: 46px; border-radius: 50%; border: 1px solid var(--border);
  background: rgba(255,255,255,.85); color: var(--navy); font-size: 17px;
  box-shadow: var(--shadow); transition: all .25s;
}
.hero-arrow:hover { background: var(--primary); border-color: var(--primary); color: #fff; }
.hero-arrow.prev { left: 22px; }
.hero-arrow.next { right: 22px; }

/* hero 文案与导航 logo 左边线严格对齐（同用 .container，勿单独改左内边距） */

/* 数据条：浅色 */
.hero-stats { background: #eaf2ff; border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); padding: 30px 0; }
.hero-stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.stat { text-align: center; }
.stat strong {
  font-size: clamp(30px, 3.6vw, 44px); font-weight: 900;
  background: linear-gradient(90deg, var(--primary-dark), var(--cyan));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.stat span { font-size: 18px; font-weight: 700; margin-left: 4px; color: var(--primary); }
.stat em { display: block; font-style: normal; font-size: 13.5px; color: var(--text-light); margin-top: 2px; }

/* ---------- 核心业务 ---------- */
.service-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.service-card {
  position: relative; background: rgba(255,255,255,.92); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 40px 32px; overflow: hidden;
  transition: all .3s ease; display: flex; flex-direction: column;
}
.service-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-hover); border-color: transparent; }
.service-no {
  position: absolute; top: 18px; right: 24px; font-size: 44px; font-weight: 900;
  color: rgba(var(--primary-rgb), .09); line-height: 1;
}
.service-icon {
  width: 62px; height: 62px; border-radius: 16px; margin-bottom: 22px;
  background: linear-gradient(135deg, rgba(var(--primary-rgb), .1), rgba(var(--cyan-rgb), .14));
  color: var(--primary); display: flex; align-items: center; justify-content: center;
}
.service-icon svg { width: 34px; height: 34px; }
.service-card h3 { font-size: 20px; color: var(--navy); margin-bottom: 12px; }
.service-card p { font-size: 14px; color: var(--text-light); flex: 1; }
.service-link { margin-top: 20px; font-size: 14px; font-weight: 700; color: var(--primary); }

/* ---------- 关于我们 ---------- */
.about-grid { display: grid; grid-template-columns: 1.5fr 1fr; gap: 56px; align-items: center; }
.about-text p { color: var(--text-light); font-size: 15px; margin-bottom: 14px; text-align: justify; }
.about-text strong { color: var(--primary); }
.about-points { margin: 18px 0 26px; }
.about-points li {
  position: relative; padding-left: 26px; margin-bottom: 10px;
  font-size: 14.5px; font-weight: 600; color: var(--text);
}
.about-points li::before {
  content: "✓"; position: absolute; left: 0; top: 1px;
  width: 18px; height: 18px; border-radius: 50%; font-size: 11px;
  background: linear-gradient(135deg, var(--primary), var(--cyan));
  color: #fff; display: flex; align-items: center; justify-content: center;
}
/* 关于我们右侧：公司商务中心实景图（保持原比例自适应） */
.about-photo img {
  display: block; width: 100%; height: auto;
  border-radius: var(--radius); box-shadow: var(--shadow);
  border: 1px solid var(--border);
}
.about-cards { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.about-card {
  background: rgba(255,255,255,.95); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 30px 20px;
  text-align: center; box-shadow: var(--shadow); transition: all .3s;
}
.about-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); }
.about-card strong { font-size: 34px; font-weight: 900; color: var(--primary); }
.about-card strong small { font-size: 15px; margin-left: 2px; }
.about-card span { display: block; font-size: 13.5px; color: var(--text-light); margin-top: 6px; }

/* ---------- 开发架构（浅色网格底纹） ---------- */
.arch-figure { margin: -14px 0 46px; }
.arch-figure img {
  display: block; width: 100%; max-width: 1160px; height: auto;
  margin: 0 auto; border-radius: 18px;
  box-shadow: var(--shadow); background: #fff;
}
.arch-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.arch-item {
  background: rgba(255,255,255,.9); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 32px 28px; transition: all .3s;
}
.arch-item:hover { border-color: var(--primary); transform: translateY(-6px); box-shadow: var(--shadow-hover); }
.arch-x {
  display: inline-flex; width: 30px; height: 30px; border-radius: 50%;
  background: rgba(220,38,38,.1); color: #dc2626; font-weight: 800;
  align-items: center; justify-content: center; margin-bottom: 16px;
}
.arch-item p { color: var(--navy); font-weight: 700; font-size: 16px; }
.arch-item em { display: block; font-style: normal; margin-top: 12px; font-size: 13.5px; color: var(--text-light); }

/* ---------- 行业解决方案 ---------- */
.industry-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.industry-card {
  background: rgba(255,255,255,.95); border-radius: var(--radius); overflow: hidden;
  border: 1px solid var(--border); transition: all .3s ease; display: flex; flex-direction: column;
}
.industry-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-hover); }
.industry-img { overflow: hidden; aspect-ratio: 16 / 9; }
.industry-img img { width: 100%; height: 100%; object-fit: cover; transition: transform .5s ease; }
.industry-card:hover .industry-img img { transform: scale(1.06); }
.industry-body { padding: 24px 24px 26px; display: flex; flex-direction: column; flex: 1; }
.industry-body h3 { font-size: 19px; color: var(--navy); margin-bottom: 10px; }
.industry-body h3::before {
  content: ""; display: inline-block; width: 4px; height: 15px; margin-right: 9px;
  border-radius: 2px; background: linear-gradient(180deg, var(--primary), var(--cyan));
  vertical-align: -1px;
}
.industry-body p { font-size: 13.5px; color: var(--text-light); flex: 1; }
.industry-link { margin-top: 16px; font-size: 14px; font-weight: 700; color: var(--primary); }

/* ---------- 开发流程 ---------- */
.process-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.process-step {
  position: relative; background: rgba(255,255,255,.92); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 28px 26px; transition: all .3s;
}
.process-step:hover { border-color: var(--primary); transform: translateY(-6px); box-shadow: var(--shadow-hover); }
.process-step span {
  display: inline-flex; width: 44px; height: 44px; border-radius: 12px;
  background: linear-gradient(135deg, var(--primary), var(--cyan));
  color: #fff; font-size: 18px; font-weight: 700;
  align-items: center; justify-content: center; margin-bottom: 14px;
}
.process-step h3 { font-size: 17px; color: var(--navy); margin-bottom: 6px; }
.process-step p { font-size: 13.5px; color: var(--text-light); }

/* ---------- 项目管理 ---------- */
.pm-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.pm-card {
  background: rgba(255,255,255,.95); border-radius: var(--radius); padding: 32px 26px;
  border: 1px solid var(--border); border-top: 4px solid transparent; transition: all .3s;
}
.pm-card:hover { border-top-color: var(--primary); transform: translateY(-6px); box-shadow: var(--shadow-hover); }
.pm-card strong { font-size: 19px; color: var(--navy); display: block; margin-bottom: 10px; }
.pm-card p { font-size: 13.5px; color: var(--text-light); }

/* ---------- 合作伙伴 ---------- */
.partner-wall { display: grid; grid-template-columns: repeat(5, 1fr); gap: 16px; }
.partner-wall span {
  display: flex; align-items: center; justify-content: center;
  background: rgba(255,255,255,.95); border: 1px solid var(--border); border-radius: 10px;
  height: 66px; font-size: 15px; font-weight: 700; color: #8fa3c4;
  letter-spacing: 2px; transition: all .3s;
}
.partner-wall span:hover { color: var(--primary); border-color: var(--primary); box-shadow: var(--shadow); }

/* ---------- 部分合作客户 · 客户木牌墙（assets/images/clients_wood） ---------- */
/* 素材为 600×450 木纹金属牌、四周透明圆角，等比直铺，不做二次卡片包装 */
.plaque-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 30px 22px;
}
.plaque {
  position: relative;
  aspect-ratio: 4 / 3;
  display: flex; align-items: center; justify-content: center;
  cursor: default;
  transition: transform .4s cubic-bezier(.22, .68, .32, 1.15);
}
.plaque img {
  width: 100%; height: auto;              /* 等比：宽 100% + 高 auto，不裁切变形 */
  /* 两层投影：①正面柔和落地影 ②右下方向更浅的偏移影，做出轻微离墙感 */
  filter:
    drop-shadow(0 12px 20px rgba(20, 41, 78, .18))
    drop-shadow(12px 16px 22px rgba(20, 41, 78, .10));
  transition: filter .4s ease, transform .4s cubic-bezier(.22, .68, .32, 1.15);
}
/* 扫光层：hover 时一道低透明度高光轻轻划过 */
.plaque::after {
  content: ""; position: absolute; inset: 0;
  border-radius: 6%;                      /* 与牌匾圆角比例接近，扫光不溢出 */
  background: linear-gradient(115deg,
    transparent 42%, rgba(255,255,255,.14) 48%,
    rgba(255,255,255,.30) 50%, rgba(255,255,255,.14) 52%, transparent 58%);
  background-size: 320% 100%;
  background-repeat: no-repeat;
  background-position: 135% 0;
  opacity: 0;
  pointer-events: none;
  transition: opacity .25s ease;
}
.plaque:hover { transform: translateY(-8px); }
.plaque:hover img {
  transform: scale(1.04);
  filter:
    drop-shadow(0 20px 30px rgba(20, 41, 78, .24))
    drop-shadow(16px 22px 28px rgba(20, 41, 78, .13));
}
.plaque:hover::after {
  opacity: 1;
  animation: plaque-sweep .9s cubic-bezier(.4, 0, .2, 1) forwards;
}
@keyframes plaque-sweep {
  from { background-position: 135% 0; }
  to   { background-position: -135% 0; }
}

@media (max-width: 1024px) {
  .plaque-grid { grid-template-columns: repeat(3, 1fr); gap: 24px 18px; }
}
@media (max-width: 520px) {
  .plaque-grid { grid-template-columns: repeat(2, 1fr); gap: 18px 12px; }
}

/* ---------- 新闻动态 ---------- */
.news-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.news-card {
  background: rgba(255,255,255,.95); border-radius: var(--radius); padding: 30px 28px;
  border: 1px solid var(--border); transition: all .3s; display: flex; flex-direction: column;
}
.news-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); }
.news-card time { font-size: 12.5px; color: var(--primary); font-weight: 600; margin-bottom: 12px; }
.news-card h3 { font-size: 17px; color: var(--navy); line-height: 1.55; flex: 1; }
.news-more { margin-top: 18px; font-size: 13.5px; font-weight: 700; color: var(--primary); }

/* ---------- 获取报价（浅色圆点底纹） ---------- */
.quote {
  background:
    radial-gradient(rgba(var(--primary-rgb), 0.08) 1.5px, transparent 1.5px),
    linear-gradient(135deg, #eaf2ff 0%, #f6faff 60%, #e8f4ff 100%);
  background-size: 26px 26px, auto;
}
.quote-grid { display: grid; grid-template-columns: 1.2fr 1fr; gap: 60px; align-items: center; }
.quote-text h2 { font-size: clamp(24px, 3vw, 34px); font-weight: 800; line-height: 1.4; color: var(--navy); }
.quote-text > p { margin-top: 16px; color: var(--text-light); font-size: 15px; }
.quote-contact { margin-top: 26px; display: grid; gap: 12px; }
.quote-contact li { font-size: 15px; color: var(--text); }
.quote-contact a { color: var(--primary); font-weight: 700; }
.quote-form {
  background: #fff; border: 1px solid var(--border); border-radius: 18px;
  padding: 36px 32px; color: var(--text); box-shadow: var(--shadow-hover);
}
.quote-form h3 { font-size: 20px; color: var(--navy); margin-bottom: 20px; text-align: center; }
.form-row { margin-bottom: 14px; }
.quote-form input, .quote-form select, .quote-form textarea {
  width: 100%; padding: 12px 15px; border: 1.5px solid var(--border);
  border-radius: 10px; font-size: 14px; font-family: inherit; color: var(--text);
  background: var(--bg-soft); outline: none; transition: all .2s; resize: vertical;
}
.quote-form input:focus, .quote-form select:focus, .quote-form textarea:focus {
  border-color: var(--primary); background: #fff; box-shadow: 0 0 0 3px rgba(var(--primary-rgb), .12);
}
.form-tip { text-align: center; font-size: 13px; color: #16a34a; min-height: 20px; margin-top: 10px; font-weight: 600; }

/* ---------- 页脚（浅色） ---------- */
.footer { background: #eef3fb; border-top: 1px solid var(--border); color: var(--text-light); padding: 64px 0 0; font-size: 14px; }
.footer-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr; gap: 40px; padding-bottom: 48px; }
.footer .logo-text { color: var(--navy); }
.footer .logo-text small { color: var(--text-light); }
.footer-brand p { margin-top: 18px; line-height: 1.8; }
.footer-col { display: flex; flex-direction: column; gap: 10px; }
.footer-col h4 { color: var(--navy); font-size: 15px; margin-bottom: 8px; }
.footer-col a:hover { color: var(--primary); }
.footer-bottom { border-top: 1px solid var(--border); background: #fff; padding: 20px 0; font-size: 12.5px; text-align: center; }

/* ---------- 悬浮按钮 ---------- */
.float-consult {
  position: fixed; right: 24px; bottom: 100px; z-index: 90;
  padding: 13px 20px; border-radius: 999px; font-size: 14px; font-weight: 700; color: #fff;
  background: linear-gradient(90deg, var(--primary), var(--cyan));
  box-shadow: 0 10px 26px rgba(var(--primary-rgb), .4); transition: all .3s;
  opacity: 0; visibility: hidden; transform: translateY(16px);
}
.float-consult.show { opacity: 1; visibility: visible; transform: translateY(0); }
.float-consult:hover { transform: translateY(-3px); }
.back-top {
  position: fixed; right: 24px; bottom: 44px; z-index: 90;
  width: 46px; height: 46px; border-radius: 50%; border: 1px solid var(--border);
  background: #fff; color: var(--navy); font-size: 18px; box-shadow: var(--shadow);
  opacity: 0; visibility: hidden; transition: all .3s;
}
.back-top.show { opacity: 1; visibility: visible; }
.back-top:hover { background: var(--primary); border-color: var(--primary); color: #fff; }

/* ---------- 滚动进入动画 ---------- */
.reveal { opacity: 0; transform: translateY(34px); transition: opacity .7s ease, transform .7s ease; }
.reveal.visible { opacity: 1; transform: translateY(0); }

/* ==========================================================
   主体与智能客服浮窗
   浏览器宽度 > 1200px 时，右下角浮出一个 810×630 的客服窗口：
   固定尺寸、可拖动、无关闭按钮
   ========================================================== */
.page-shell { display: block; }
.page-main { width: 100%; min-width: 0; }

@media (min-width: 1201px) {
  .chat-dock { display: flex; }
  /* 客服浮窗占据右下角，隐藏同位置的悬浮按钮避免遮挡 */
  .float-consult, .back-top { display: none; }
}

/* ==========================================================
   响应式
   ========================================================== */
@media (max-width: 1024px) {
  .service-grid, .industry-grid, .process-grid, .news-grid, .arch-grid { grid-template-columns: repeat(2, 1fr); }
  .pm-grid { grid-template-columns: repeat(2, 1fr); }
  .partner-wall { grid-template-columns: repeat(3, 1fr); }
  .about-grid { grid-template-columns: 1fr; gap: 36px; }
  .quote-grid { grid-template-columns: 1fr; gap: 40px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .section { padding: 60px 0; }
  .section-head { margin-bottom: 38px; }
  .topbar-right { display: none; }

  /* 移动端导航 */
  .header-cta { display: none; }
  .nav-toggle { display: flex; }
  .logo-img { height: 32px; }
  .nav {
    position: absolute; top: 72px; left: 0; right: 0;
    background: #fff; flex-direction: column; gap: 0;
    padding: 10px 4%; border-bottom: 1px solid var(--border);
    box-shadow: 0 18px 30px rgba(20,41,78,.12);
    transform: translateY(-12px); opacity: 0; visibility: hidden;
    transition: all .3s;
  }
  .nav.open { transform: translateY(0); opacity: 1; visibility: visible; }
  .nav a { padding: 13px 10px; border-radius: 8px; }

  .hero-carousel { height: 520px; }
  .hero-slide { background-position: 70% center; }
  .hero-mask {
    background: linear-gradient(180deg,
      rgba(255,255,255,.9) 0%, rgba(255,255,255,.82) 55%, rgba(255,255,255,.94) 100%);
  }
  .hero-content { max-width: 100%; }
  .hero-arrow { display: none; }
  .hero-stats-grid { grid-template-columns: repeat(2, 1fr); gap: 24px 12px; }

  .service-grid, .industry-grid { gap: 18px; }
  .service-card { padding: 30px 24px; }
  .quote-form { padding: 28px 22px; }
  .float-consult { right: 16px; bottom: 96px; }
  .back-top { right: 16px; bottom: 40px; }
}

@media (max-width: 520px) {
  .service-grid, .industry-grid, .process-grid, .news-grid, .arch-grid,
  .pm-grid, .about-cards, .footer-grid { grid-template-columns: 1fr; }
  .partner-wall { grid-template-columns: repeat(2, 1fr); }
  .logo-img { height: 26px; }
  .hero-content h1 { font-size: 30px; }
  .hero-btns .btn { width: 100%; }
  .footer-grid { gap: 30px; }
}

/* 单图横幅：完全撑满整行 */
.img-banner img {
  width: 100%;        /* 撑满版块宽度 */
  height: auto;       /* 高度按原图比例，不裁切 */
  display: block;     /* 消除图片底部 4px 空隙（style.css 已有，双保险） */
}