/* =========================================================
   中山市青云机电安装有限公司 - 官网全局样式
   主色：青云蓝 #00A6C8 + 活力橙 #FF7A00（明亮，非暗色调）
   ========================================================= */

:root {
  --primary: #00a6c8;          /* 青云蓝（主色） */
  --primary-dark: #00849e;     /* 主色深一档 */
  --primary-light: #e3f6fb;    /* 主色浅底 */
  --accent: #ff7a00;           /* 活力橙（点缀） */
  --accent-dark: #e56a00;
  --accent-light: #fff2e5;
  --text-main: #2d3a3f;        /* 正文深灰（仅文字，非界面暗色） */
  --text-sub: #5f7076;
  --bg-light: #f4fbfd;         /* 页面浅底 */
  --card-bg: #ffffff;
  --border: #d9eef4;
  --shadow: 0 8px 24px rgba(0, 166, 200, 0.10);
  --radius: 14px;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: "Microsoft YaHei", "PingFang SC", "Helvetica Neue", Arial, sans-serif;
  color: var(--text-main);
  background: var(--bg-light);
  line-height: 1.75;
  font-size: 16px;
}

a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { max-width: 100%; display: block; }

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* =========================================================
   顶部导航（全站复用）
   ========================================================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: #ffffff;
  box-shadow: 0 2px 12px rgba(0, 166, 200, 0.12);
}

.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
  gap: 20px;
}

/* ---- LOGO：文字 QY，带底纹，特别显眼 ---- */
.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.logo-badge {
  position: relative;
  width: 54px;
  height: 54px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  /* 青蓝渐变底 + 斜纹底纹 */
  background:
    repeating-linear-gradient(
      -45deg,
      rgba(255, 255, 255, 0.14) 0 6px,
      rgba(255, 255, 255, 0) 6px 12px
    ),
    linear-gradient(135deg, #00c2e8 0%, #00a6c8 55%, #00849e 100%);
  box-shadow:
    0 6px 16px rgba(0, 166, 200, 0.35),
    inset 0 1px 0 rgba(255, 255, 255, 0.45);
  overflow: hidden;
}

/* 底纹上加一个橙色高光弧，更显眼 */
.logo-badge::after {
  content: "";
  position: absolute;
  right: -12px;
  top: -12px;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: radial-gradient(circle at center, rgba(255, 122, 0, 0.85), rgba(255, 122, 0, 0));
  opacity: 0.9;
}

.logo-badge span {
  position: relative;
  z-index: 2;
  font-size: 30px;
  font-weight: 900;
  letter-spacing: 1px;
  color: #ffffff;
  text-shadow:
    0 2px 0 rgba(0, 90, 110, 0.55),
    0 0 12px rgba(255, 255, 255, 0.75);
  font-style: italic;
}

.logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.25;
}

.logo-text strong {
  font-size: 19px;
  color: var(--primary-dark);
  letter-spacing: 0.5px;
  font-weight: 800;
  white-space: nowrap;
}

.logo-text small {
  font-size: 12px;
  color: var(--text-sub);
  letter-spacing: 2px;
  white-space: nowrap;
}

/* ---- 导航菜单 ---- */
.main-nav ul {
  display: flex;
  align-items: center;
  gap: 6px;
}

.main-nav a {
  display: block;
  padding: 10px 18px;
  font-size: 16px;
  color: var(--text-main);
  border-radius: 999px;
  position: relative;
  transition: all 0.25s ease;
}

.main-nav a:hover {
  color: var(--primary);
  background: var(--primary-light);
}

.main-nav a.active {
  color: #ffffff;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  box-shadow: 0 4px 12px rgba(0, 166, 200, 0.35);
}

/* 移动端菜单按钮 */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.nav-toggle span {
  width: 26px;
  height: 3px;
  border-radius: 3px;
  background: var(--primary-dark);
  transition: 0.3s;
}

/* =========================================================
   页面顶部横幅（首页 Hero / 子页 Banner）
   ========================================================= */
.hero {
  background:
    radial-gradient(circle at 85% 20%, rgba(255, 122, 0, 0.16) 0, transparent 40%),
    radial-gradient(circle at 10% 90%, rgba(0, 166, 200, 0.22) 0, transparent 45%),
    linear-gradient(135deg, #eaf8fc 0%, #d6f0f8 100%);
  padding: 88px 0 96px;
  position: relative;
  overflow: hidden;
}

/* 装饰：左上右下的大圆环与斜纹 */
.hero::before,
.hero::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  border: 3px solid rgba(0, 166, 200, 0.25);
}

.hero::before { width: 260px; height: 260px; top: -90px; left: -80px; }
.hero::after { width: 360px; height: 360px; bottom: -160px; right: -100px; border-color: rgba(255, 122, 0, 0.22); }

.hero .container { position: relative; z-index: 2; }

.hero h1 {
  font-size: 44px;
  line-height: 1.35;
  color: var(--primary-dark);
  font-weight: 800;
  max-width: 760px;
}

.hero h1 em {
  font-style: normal;
  color: var(--accent);
}

.hero p {
  margin-top: 18px;
  max-width: 640px;
  color: var(--text-sub);
  font-size: 17px;
}

.hero-actions { margin-top: 30px; display: flex; gap: 16px; flex-wrap: wrap; }

.btn {
  display: inline-block;
  padding: 12px 28px;
  border-radius: 999px;
  font-size: 16px;
  font-weight: 700;
  transition: all 0.25s ease;
  border: 2px solid transparent;
  cursor: pointer;
}

.btn-primary {
  color: #fff;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  box-shadow: 0 6px 16px rgba(0, 166, 200, 0.35);
}

.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 10px 22px rgba(0, 166, 200, 0.4); }

.btn-accent {
  color: #fff;
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  box-shadow: 0 6px 16px rgba(255, 122, 0, 0.35);
}

.btn-accent:hover { transform: translateY(-2px); box-shadow: 0 10px 22px rgba(255, 122, 0, 0.42); }

.btn-outline {
  color: var(--primary-dark);
  border-color: var(--primary);
  background: #fff;
}

.btn-outline:hover { background: var(--primary-light); }

/* 子页面 Banner */
.page-banner {
  background:
    radial-gradient(circle at 90% 30%, rgba(255, 122, 0, 0.16) 0, transparent 40%),
    linear-gradient(135deg, #eaf8fc 0%, #d6f0f8 100%);
  padding: 54px 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.page-banner h1 { font-size: 34px; color: var(--primary-dark); font-weight: 800; }

.page-banner p { margin-top: 8px; color: var(--text-sub); }

/* =========================================================
   通用板块
   ========================================================= */
.section { padding: 72px 0; }

.section-alt { background: #ffffff; }

.section-head {
  text-align: center;
  margin-bottom: 44px;
}

.section-head .tag {
  display: inline-block;
  padding: 5px 16px;
  border-radius: 999px;
  background: var(--primary-light);
  color: var(--primary-dark);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 1px;
  margin-bottom: 12px;
}

.section-head h2 {
  font-size: 32px;
  color: var(--text-main);
  font-weight: 800;
  position: relative;
  display: inline-block;
}

.section-head h2::after {
  content: "";
  display: block;
  width: 60px;
  height: 4px;
  border-radius: 4px;
  margin: 14px auto 0;
  background: linear-gradient(90deg, var(--primary), var(--accent));
}

.section-head p { margin-top: 14px; color: var(--text-sub); }

/* =========================================================
   公司简介板块
   ========================================================= */
.intro-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.intro-text h3 {
  font-size: 24px;
  color: var(--primary-dark);
  margin-bottom: 18px;
  border-left: 5px solid var(--accent);
  padding-left: 14px;
}

.intro-text p { color: var(--text-sub); margin-bottom: 16px; }

.intro-text ul.feature-list { margin-top: 8px; }

.intro-text ul.feature-list li {
  position: relative;
  padding: 8px 0 8px 30px;
  color: var(--text-main);
}

.intro-text ul.feature-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  top: 8px;
  width: 22px;
  height: 22px;
  line-height: 22px;
  text-align: center;
  border-radius: 50%;
  background: var(--accent-light);
  color: var(--accent);
  font-weight: 800;
  font-size: 13px;
}

/* =========================================================
   轮播图
   ========================================================= */
.carousel {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  background: #fff;
}

.carousel-track {
  display: flex;
  transition: transform 0.5s ease;
}

.carousel-slide { min-width: 100%; position: relative; }

.carousel-slide img {
  width: 100%;
  height: 380px;
  object-fit: cover;
}

/* 资质证书轮播：竖向完整显示（证书为竖版图） */
.carousel--cert { background: #f4fbfd; }
.carousel--cert .carousel-slide img {
  height: 480px;
  object-fit: contain;
  background: #f4fbfd;
}

.carousel-slide .slide-caption {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  padding: 40px 22px 16px;
  background: linear-gradient(transparent, rgba(0, 60, 75, 0.65));
  color: #fff;
  font-size: 15px;
}

.carousel-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 40px;
  height: 40px;
  border: none;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.9);
  color: var(--primary-dark);
  font-size: 20px;
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
  transition: 0.2s;
  z-index: 5;
}

.carousel-btn:hover { background: var(--accent); color: #fff; }

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

.carousel-dots {
  position: absolute;
  bottom: 14px;
  left: 0; right: 0;
  display: flex;
  justify-content: center;
  gap: 8px;
  z-index: 5;
}

.carousel-dots button {
  width: 10px;
  height: 10px;
  border: none;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.6);
  cursor: pointer;
  transition: 0.25s;
  padding: 0;
}

.carousel-dots button.active { background: var(--accent); width: 24px; border-radius: 999px; }

/* =========================================================
   资质证书板块
   ========================================================= */
.cert-grid {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 48px;
  align-items: start;
}

.cert-list { display: flex; flex-direction: column; gap: 18px; }

.cert-item {
  display: flex;
  align-items: center;
  gap: 18px;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-left: 5px solid var(--accent);
  border-radius: 12px;
  padding: 18px 20px;
  box-shadow: 0 4px 14px rgba(0, 166, 200, 0.08);
  transition: 0.25s;
}

.cert-item:hover { transform: translateX(6px); box-shadow: 0 8px 20px rgba(0, 166, 200, 0.16); }

.cert-item .cert-icon {
  width: 52px;
  height: 52px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--primary-light), var(--primary));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 22px;
  flex-shrink: 0;
}

.cert-item .cert-info { flex: 1; }

.cert-item .cert-info strong {
  display: block;
  font-size: 17px;
  color: var(--text-main);
}

.cert-item .cert-info span {
  font-size: 14px;
  color: var(--text-sub);
}

.cert-item .cert-level {
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  color: #fff;
  font-weight: 800;
  font-size: 15px;
  padding: 6px 14px;
  border-radius: 999px;
  white-space: nowrap;
}

/* =========================================================
   资质证书独立页
   ========================================================= */
.cert-page-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
  align-items: start;
}

.cert-page-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: 0.3s;
}

.cert-page-card:hover { transform: translateY(-6px); box-shadow: 0 14px 30px rgba(0, 166, 200, 0.18); }

.cert-page-img {
  height: 430px;
  background: #f4fbfd;
}

.cert-page-img img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  background: #f4fbfd;
}

.cert-page-info {
  padding: 20px 22px 24px;
  text-align: center;
  border-top: 3px solid var(--accent);
}

.cert-page-info h3 {
  font-size: 19px;
  color: var(--text-main);
  margin: 12px 0 6px;
}

.cert-page-info p { font-size: 14.5px; color: var(--text-sub); }

.cert-page-info .cert-level { display: inline-block; }

/* =========================================================
   工程案例页
   ========================================================= */
.cases-intro {
  max-width: 900px;
  margin: 0 auto 42px;
  text-align: center;
  color: var(--text-sub);
  font-size: 17px;
  line-height: 2;
}

.cases-intro strong { color: var(--primary-dark); }

.cases-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}

.case-item {
  position: relative;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: 0.3s;
}

.case-item:hover { transform: translateY(-6px); box-shadow: 0 14px 30px rgba(0, 166, 200, 0.18); }

.case-img {
  height: 260px;
  background: #f4fbfd;
}

.case-img img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  background: #f4fbfd;
}

.case-tag {
  position: absolute;
  left: 12px;
  top: 12px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
  font-size: 13px;
  font-weight: 700;
  padding: 5px 14px;
  border-radius: 999px;
  box-shadow: 0 3px 8px rgba(0, 0, 0, 0.15);
}

/* =========================================================
   企业精神板块
   ========================================================= */
.spirit {
  background:
    radial-gradient(circle at 15% 20%, rgba(255, 122, 0, 0.14) 0, transparent 45%),
    radial-gradient(circle at 85% 80%, rgba(0, 166, 200, 0.18) 0, transparent 45%),
    linear-gradient(135deg, #eaf8fc 0%, #f0fbfe 100%);
  text-align: center;
}

.spirit-quote {
  font-size: 30px;
  font-weight: 800;
  color: var(--primary-dark);
  letter-spacing: 3px;
  margin-bottom: 18px;
}

.spirit-quote em { font-style: normal; color: var(--accent); }

.spirit p { max-width: 720px; margin: 0 auto; color: var(--text-sub); font-size: 17px; }

.spirit .spirit-mark {
  display: inline-block;
  margin-top: 26px;
  font-size: 15px;
  color: var(--primary-dark);
  background: #fff;
  border: 1px solid var(--border);
  padding: 8px 22px;
  border-radius: 999px;
  box-shadow: var(--shadow);
}

/* =========================================================
   核心业务预览（首页底部）
   ========================================================= */
.biz-preview-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.biz-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  transition: 0.3s;
}

.biz-card:hover { transform: translateY(-6px); box-shadow: 0 14px 30px rgba(0, 166, 200, 0.18); }

.biz-card .biz-body { padding: 24px; }

.biz-card .biz-icon {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
  font-size: 26px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
}

.biz-card:nth-child(2) .biz-icon { background: linear-gradient(135deg, var(--accent), var(--accent-dark)); }

.biz-card h3 { font-size: 20px; color: var(--text-main); margin-bottom: 10px; }

.biz-card p { color: var(--text-sub); font-size: 15px; }

.biz-card .biz-more {
  display: inline-block;
  margin-top: 16px;
  color: var(--primary);
  font-weight: 700;
  font-size: 15px;
}

.biz-card .biz-more:hover { color: var(--accent); }

/* =========================================================
   业务范围页
   ========================================================= */
.biz-section .biz-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
  margin-bottom: 28px;
}

.biz-img-item {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}

.biz-img-item img {
  width: 100%;
  height: 280px;
  object-fit: contain;
  background: #f4fbfd;
  transition: transform 0.4s ease;
}

.biz-img-item:hover img { transform: scale(1.05); }

.biz-img-item .img-tag {
  position: absolute;
  left: 14px;
  top: 14px;
  background: rgba(255, 122, 0, 0.92);
  color: #fff;
  font-size: 13px;
  padding: 4px 14px;
  border-radius: 999px;
  font-weight: 700;
}

.biz-block { margin-bottom: 56px; }

.biz-block > h3 {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 24px;
  color: var(--primary-dark);
  margin-bottom: 20px;
}

.biz-block > h3::before {
  content: "";
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 5px var(--accent-light);
}

.biz-block > p { color: var(--text-sub); margin-bottom: 20px; }

/* =========================================================
   维护保养页
   ========================================================= */
.maintain-features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 36px;
}

.m-feature {
  background: #fff;
  border: 1px solid var(--border);
  border-top: 4px solid var(--accent);
  border-radius: var(--radius);
  padding: 26px 24px;
  box-shadow: 0 6px 18px rgba(0, 166, 200, 0.08);
  transition: 0.25s;
}

.m-feature:hover { transform: translateY(-4px); box-shadow: 0 12px 26px rgba(0, 166, 200, 0.16); }

.m-feature .m-icon {
  width: 50px;
  height: 50px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--primary-light), var(--primary));
  color: #fff;
  font-size: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 14px;
}

.m-feature h4 { font-size: 18px; color: var(--text-main); margin-bottom: 8px; }

.m-feature p { font-size: 14.5px; color: var(--text-sub); }

.maintain-cta {
  margin-top: 44px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  border-radius: var(--radius);
  padding: 34px 36px;
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
  box-shadow: 0 10px 26px rgba(0, 166, 200, 0.3);
}

.maintain-cta h3 { font-size: 22px; }

.maintain-cta p { opacity: 0.9; margin-top: 6px; }

/* =========================================================
   联系我们页
   ========================================================= */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.3fr;
  gap: 40px;
  align-items: stretch;
}

.contact-info { display: flex; flex-direction: column; gap: 20px; }

.contact-card {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px 22px;
  box-shadow: 0 4px 14px rgba(0, 166, 200, 0.08);
}

.contact-card .c-icon {
  width: 46px;
  height: 46px;
  flex-shrink: 0;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--primary-light), var(--primary));
  color: #fff;
  font-size: 22px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.contact-card h4 { font-size: 15px; color: var(--text-sub); font-weight: 600; }

.contact-card p { font-size: 17px; color: var(--text-main); font-weight: 700; margin-top: 2px; word-break: break-all; }

.map-box {
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  min-height: 380px;
  background: var(--primary-light);
  position: relative;
}

.map-box iframe {
  width: 100%;
  height: 100%;
  min-height: 380px;
  border: 0;
  display: block;
}

/* 地图中央红旗定位标记 */
.map-flag {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -100%);
  z-index: 6;
  pointer-events: none;
  filter: drop-shadow(0 3px 6px rgba(0, 0, 0, 0.25));
}

.map-flag svg { display: block; }

.map-flag-label {
  position: absolute;
  left: 24px;
  top: 10px;
  background: #fff;
  border: 2px solid #e8412e;
  color: #e8412e;
  font-size: 13px;
  font-weight: 800;
  padding: 2px 10px;
  border-radius: 999px;
  white-space: nowrap;
  line-height: 1.5;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.15);
}

.map-label {
  position: absolute;
  left: 14px;
  top: 14px;
  z-index: 6;
  background: rgba(255, 255, 255, 0.94);
  color: var(--primary-dark);
  font-size: 13.5px;
  font-weight: 700;
  padding: 7px 14px;
  border-radius: 999px;
  box-shadow: 0 3px 10px rgba(0, 0, 0, 0.12);
  border: 1px solid var(--border);
  pointer-events: none;
}

/* =========================================================
   页脚（全站复用，含地址/电话/邮箱）
   ========================================================= */
.site-footer {
  background: linear-gradient(135deg, #006a80 0%, #0092b0 100%);
  color: #e6f7fb;
  margin-top: 0;
}

.footer-main {
  display: grid;
  grid-template-columns: 1.3fr 1fr 1fr;
  gap: 36px;
  padding: 52px 0 36px;
}

.footer-main h4 {
  font-size: 17px;
  color: #fff;
  margin-bottom: 16px;
  position: relative;
  padding-bottom: 10px;
}

.footer-main h4::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 34px;
  height: 3px;
  border-radius: 3px;
  background: var(--accent);
}

.footer-brand .logo-badge { width: 48px; height: 48px; }

.footer-brand .logo-badge span { font-size: 26px; }

.footer-brand p { font-size: 14px; margin-top: 14px; line-height: 1.9; }

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

.footer-links a {
  color: #cfeef5;
  font-size: 15px;
  transition: 0.2s;
}

.footer-links a:hover { color: var(--accent); padding-left: 6px; }

.footer-contact li {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  margin-bottom: 12px;
  font-size: 14.5px;
  line-height: 1.7;
}

.footer-contact .f-icon { color: var(--accent); flex-shrink: 0; }

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.25);
  padding: 18px 0;
  text-align: center;
  font-size: 13px;
  color: #d3f1f7;
}

.footer-bottom a {
  color: #d3f1f7;
  text-decoration: underline;
  transition: 0.2s;
}

.footer-bottom a:hover { color: var(--accent); }

/* =========================================================
   图片占位（图片未添加时显示）
   ========================================================= */
.img-placeholder {
  display: flex !important;
  align-items: center;
  justify-content: center;
  background:
    repeating-linear-gradient(-45deg, #e6f7fb 0 14px, #f4fbfd 14px 28px),
    var(--primary-light);
  color: var(--primary-dark);
  font-size: 15px;
  font-weight: 700;
  text-align: center;
  padding: 20px;
  min-height: 120px;
}

.img-placeholder::before {
  content: attr(data-placeholder-text);
  line-height: 1.6;
  max-width: 90%;
}

/* =========================================================
   响应式
   ========================================================= */
@media (max-width: 980px) {
  .intro-grid,
  .cert-grid,
  .contact-grid { grid-template-columns: 1fr; }

  .biz-preview-grid,
  .maintain-features { grid-template-columns: repeat(2, 1fr); }

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

  .footer-main { grid-template-columns: 1fr 1fr; }

  .hero h1 { font-size: 34px; }

  .nav-toggle { display: flex; }

  .main-nav {
    position: absolute;
    top: 76px;
    left: 0;
    right: 0;
    background: #fff;
    box-shadow: 0 12px 24px rgba(0, 166, 200, 0.15);
    display: none;
    padding: 12px 24px 20px;
  }

  .main-nav.open { display: block; }

  .main-nav ul { flex-direction: column; align-items: stretch; gap: 4px; }

  .main-nav a { padding: 12px 16px; border-radius: 10px; }
}

@media (max-width: 640px) {
  .section { padding: 52px 0; }

  .biz-preview-grid,
  .maintain-features,
  .cert-page-grid,
  .cases-grid,
  .footer-main { grid-template-columns: 1fr; }

  .biz-section .biz-row { grid-template-columns: 1fr; }

  .hero { padding: 60px 0 68px; }

  .hero h1 { font-size: 28px; }

  .logo-text small { display: none; }

  .carousel-slide img { height: 240px; }

  .spirit-quote { font-size: 23px; letter-spacing: 1px; }

  .section-head h2 { font-size: 26px; }
}