/* ============================================================
   江铭泽官网 - 主样式文件
   字体: 系统字体栈（无侵权），不引用任何付费字体
   ============================================================ */

/* 字体声明 - 仅使用系统字体，零版权风险 */
:root {
  --font-main: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
               "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue",
               Arial, sans-serif;

  /* 品牌色系 */
  --color-primary:     #1a1a2e;   /* 深蓝黑 主色 */
  --color-accent:      #c9a84c;   /* 金色   强调色 */
  --color-accent-light:#e8c97a;
  --color-bg:          #f8f7f4;   /* 暖白背景 */
  --color-white:       #ffffff;
  --color-text:        #2c2c2c;
  --color-text-light:  #666666;
  --color-border:      #e5e5e5;
  --color-section-alt: #f0ede8;

  /* 间距 */
  --space-xs:  8px;
  --space-sm: 16px;
  --space-md: 32px;
  --space-lg: 64px;
  --space-xl: 96px;

  /* 圆角 */
  --radius-sm:  4px;
  --radius-md:  8px;
  --radius-lg: 16px;

  /* 阴影 */
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.08);
  --shadow-md: 0 8px 32px rgba(0,0,0,0.12);
  --shadow-lg: 0 20px 60px rgba(0,0,0,0.15);

  /* 过渡 */
  --transition: 0.3s ease;
}

/* Reset */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font-main);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.7;
  overflow-x: hidden;
}
a { text-decoration: none; color: inherit; transition: color var(--transition); }
img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }

/* ============================
   通用布局
   ============================ */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}
.section { padding: var(--space-xl) 0; }
.section-alt { background: var(--color-section-alt); }
.section-dark { background: var(--color-primary); color: var(--color-white); }

.section-header { text-align: center; margin-bottom: var(--space-lg); }
.section-label {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 12px;
}
.section-title {
  font-size: clamp(24px, 3vw, 42px);
  font-weight: 700;
  line-height: 1.3;
  color: var(--color-primary);
}
.section-dark .section-title { color: var(--color-white); }
.section-subtitle {
  font-size: 16px;
  color: var(--color-text-light);
  margin-top: 12px;
}
.section-dark .section-subtitle { color: rgba(255,255,255,0.7); }

/* 网格 */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 32px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }

/* ============================
   按钮
   ============================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all var(--transition);
  white-space: nowrap;
}
.btn-primary {
  background: var(--color-accent);
  color: var(--color-primary);
}
.btn-primary:hover {
  background: var(--color-accent-light);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}
.btn-outline {
  background: transparent;
  color: var(--color-accent);
  border: 2px solid var(--color-accent);
}
.btn-outline:hover {
  background: var(--color-accent);
  color: var(--color-primary);
}
.btn-white {
  background: var(--color-white);
  color: var(--color-primary);
}
.btn-white:hover {
  background: var(--color-accent);
  color: var(--color-primary);
}
.btn-sm { padding: 10px 22px; font-size: 14px; }
.btn-lg { padding: 18px 48px; font-size: 17px; }

/* ============================
   导航栏
   ============================ */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: transparent;
  transition: background var(--transition), box-shadow var(--transition);
  padding: 0;
}
.navbar.scrolled {
  background: var(--color-primary);
  box-shadow: var(--shadow-md);
}
.navbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}
.navbar-logo {
  display: flex;
  flex-direction: column;
  color: #fff;
  text-decoration: none;
  line-height: 1.2;
}
.navbar-logo .logo-text { font-size: 20px; font-weight: 800; letter-spacing: 1px; }
.navbar-logo .logo-sub { font-size: 11px; margin-top: 2px; color: #c9a84c; }

/* 导航标语 */
.navbar-tagline {
  font-size: 12px;
  color: #c9a84c;
  white-space: nowrap;
  letter-spacing: 0.5px;
  margin-left: 16px;
  padding-left: 16px;
  border-left: 1px solid rgba(201,168,76,0.3);
}

/* 品牌标语 */
.nav-brand {
  display: flex;
  flex-direction: column;
  justify-content: center;
  line-height: 1.2;
}
.nav-logo {
  font-size: 22px;
  font-weight: 700;
  color: #fff;
  letter-spacing: 1px;
}
.nav-logo span { color: #e94560; }
.nav-tagline {
  font-size: 11px;
  color: #c9a84c;
  margin-top: 2px;
  letter-spacing: 0.5px;
}

.navbar-menu { display: flex; align-items: center; gap: 8px; }
.navbar-menu a {
  color: rgba(255,255,255,0.85);
  font-size: 14px;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}
.navbar-menu a:hover, .navbar-menu a.active {
  color: var(--color-accent);
  background: rgba(255,255,255,0.08);
}
.navbar-cta { margin-left: 16px; }

.navbar-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
}
.navbar-toggle span {
  display: block;
  width: 24px; height: 2px;
  background: var(--color-white);
  transition: all var(--transition);
}

/* ============================
   Hero 区域
   ============================ */
.hero {
  min-height: 100vh;
  background: linear-gradient(135deg, #0d0d1f 0%, #1a1a2e 50%, #16213e 100%);
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  padding-top: 72px;
}
.hero::before {
  content: '';
  position: absolute;
  width: 600px; height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(201,168,76,0.15) 0%, transparent 70%);
  top: -100px; right: -100px;
}
.hero::after {
  content: '';
  position: absolute;
  width: 400px; height: 400px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(201,168,76,0.08) 0%, transparent 70%);
  bottom: -50px; left: -50px;
}
.hero-content {
  position: relative;
  z-index: 2;
  max-width: 680px;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(201,168,76,0.15);
  border: 1px solid rgba(201,168,76,0.3);
  color: var(--color-accent);
  padding: 6px 16px;
  border-radius: 100px;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 24px;
}
.hero-badge::before {
  content: '';
  display: inline-block;
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--color-accent);
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.8); }
}
.hero h1 {
  font-size: clamp(36px, 5vw, 64px);
  font-weight: 800;
  color: var(--color-white);
  line-height: 1.2;
  margin-bottom: 24px;
}
.hero h1 span { color: var(--color-accent); }
.hero-desc {
  font-size: 18px;
  color: rgba(255,255,255,0.75);
  margin-bottom: 40px;
  line-height: 1.8;
}
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }
.hero-stats {
  display: flex;
  gap: 48px;
  margin-top: 64px;
  padding-top: 40px;
  border-top: 1px solid rgba(255,255,255,0.1);
}
.stat-item {}
.stat-num {
  font-size: 36px;
  font-weight: 800;
  color: var(--color-accent);
  line-height: 1;
}
.stat-num sup { font-size: 18px; }
.stat-label {
  font-size: 13px;
  color: rgba(255,255,255,0.6);
  margin-top: 4px;
}

/* ============================
   关于我们
   ============================ */
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 80px; align-items: center; }
.about-content {}
.about-content h2 {
  font-size: clamp(28px, 3vw, 40px);
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 20px;
  line-height: 1.3;
}
.about-content h2 span { color: var(--color-accent); }
.about-content p {
  font-size: 16px;
  color: var(--color-text-light);
  line-height: 1.9;
  margin-bottom: 16px;
}
.about-highlights { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-top: 32px; }
.highlight-item {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
}
.highlight-item .hi-num {
  font-size: 28px;
  font-weight: 800;
  color: var(--color-accent);
}
.highlight-item .hi-label {
  font-size: 13px;
  color: var(--color-text-light);
  margin-top: 4px;
}
.about-visual {
  background: linear-gradient(135deg, var(--color-primary) 0%, #16213e 100%);
  border-radius: var(--radius-lg);
  padding: 48px;
  color: var(--color-white);
}
.achievement-list { display: flex; flex-direction: column; gap: 20px; }
.achievement-item {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px;
  background: rgba(255,255,255,0.06);
  border-radius: var(--radius-md);
  border: 1px solid rgba(255,255,255,0.08);
}
.ai-icon {
  width: 44px; height: 44px;
  background: rgba(201,168,76,0.2);
  border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  font-size: 20px;
  flex-shrink: 0;
}
.ai-text .ai-title { font-weight: 600; font-size: 15px; }
.ai-text .ai-desc { font-size: 13px; color: rgba(255,255,255,0.6); margin-top: 2px; }

/* ============================
   服务产品
   ============================ */
.service-tabs {
  display: flex;
  gap: 8px;
  justify-content: center;
  margin-bottom: 48px;
  flex-wrap: wrap;
}
.service-tab {
  padding: 10px 24px;
  border-radius: 100px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  border: 2px solid var(--color-border);
  background: transparent;
  color: var(--color-text-light);
  transition: all var(--transition);
}
.service-tab.active, .service-tab:hover {
  border-color: var(--color-accent);
  background: var(--color-accent);
  color: var(--color-primary);
}
.service-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.service-card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  border: 1px solid var(--color-border);
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}
.service-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--color-accent);
  transform: scaleX(0);
  transition: transform var(--transition);
}
.service-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}
.service-card:hover::before { transform: scaleX(1); }
.service-card.featured {
  background: var(--color-primary);
  color: var(--color-white);
  border-color: var(--color-primary);
}
.service-card.featured::before { background: var(--color-accent); transform: scaleX(1); }
.sc-icon {
  width: 52px; height: 52px;
  background: rgba(201,168,76,0.12);
  border-radius: var(--radius-md);
  display: flex; align-items: center; justify-content: center;
  font-size: 24px;
  margin-bottom: 20px;
}
.service-card.featured .sc-icon { background: rgba(201,168,76,0.2); }
.sc-title { font-size: 18px; font-weight: 700; margin-bottom: 8px; }
.sc-period {
  font-size: 12px;
  color: var(--color-accent);
  background: rgba(201,168,76,0.1);
  padding: 3px 10px;
  border-radius: 100px;
  display: inline-block;
  margin-bottom: 16px;
}
.sc-desc {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.8;
}
.service-card.featured .sc-desc { color: rgba(255,255,255,0.7); }
.sc-price {
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px solid var(--color-border);
  font-size: 22px;
  font-weight: 800;
  color: var(--color-accent);
}
.service-card.featured .sc-price { border-top-color: rgba(255,255,255,0.1); }

/* ============================
   客户案例
   ============================ */
.case-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 28px; }
.case-card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: 36px;
  border: 1px solid var(--color-border);
  transition: all var(--transition);
}
.case-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}
.case-brand {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 20px;
}
.brand-logo {
  width: 48px; height: 48px;
  background: linear-gradient(135deg, var(--color-primary), #16213e);
  border-radius: var(--radius-md);
  display: flex; align-items: center; justify-content: center;
  color: var(--color-accent);
  font-size: 18px;
  font-weight: 800;
  flex-shrink: 0;
}
.brand-info .brand-name { font-size: 17px; font-weight: 700; }
.brand-info .brand-type { font-size: 12px; color: var(--color-text-light); }
.case-result {
  display: flex;
  gap: 24px;
  margin-bottom: 16px;
}
.result-num { font-size: 32px; font-weight: 800; color: var(--color-accent); }
.result-label { font-size: 12px; color: var(--color-text-light); margin-top: 2px; }
.case-desc { font-size: 14px; color: var(--color-text-light); line-height: 1.8; }
.case-tags { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 16px; }
.case-tag {
  font-size: 12px;
  padding: 3px 10px;
  border-radius: 100px;
  background: var(--color-section-alt);
  color: var(--color-text-light);
}

/* 合作品牌Logo墙 */
.brand-wall {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 20px;
  margin-top: 48px;
}
.brand-wall-item {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
  display: flex; align-items: center; justify-content: center;
  font-size: 14px;
  font-weight: 700;
  color: var(--color-text-light);
  transition: all var(--transition);
  min-height: 70px;
}
.brand-wall-item:hover {
  border-color: var(--color-accent);
  color: var(--color-primary);
  background: rgba(201,168,76,0.05);
}

/* ============================
   新闻列表
   ============================ */
.news-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.news-card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
  transition: all var(--transition);
}
.news-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}
.news-card-img {
  height: 200px;
  background: linear-gradient(135deg, var(--color-primary), #16213e);
  display: flex; align-items: center; justify-content: center;
  position: relative;
  overflow: hidden;
}
.news-card-img img { width: 100%; height: 100%; object-fit: cover; }
.news-card-img .img-placeholder {
  color: var(--color-accent);
  font-size: 48px;
  opacity: 0.6;
}
.news-card-cat {
  position: absolute;
  top: 12px; left: 12px;
  background: var(--color-accent);
  color: var(--color-primary);
  font-size: 11px;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 100px;
}
.news-card-body { padding: 24px; }
.news-card-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 12px;
  color: var(--color-text-light);
  margin-bottom: 10px;
}
.news-card-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 10px;
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.news-card-desc {
  font-size: 13px;
  color: var(--color-text-light);
  line-height: 1.7;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.news-card-footer {
  padding: 16px 24px;
  border-top: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 13px;
}
.read-more {
  color: var(--color-accent);
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 4px;
}
.read-more::after { content: '\2192'; transition: transform var(--transition); }
.news-card:hover .read-more::after { transform: translateX(4px); }

/* ============================
   联系方式
   ============================ */
.contact-grid { display: grid; grid-template-columns: 1fr 1.2fr; gap: 60px; align-items: start; }
.contact-info {}
.contact-info h3 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 20px;
  color: var(--color-primary);
}
.contact-info p { color: var(--color-text-light); line-height: 1.8; margin-bottom: 32px; }
.contact-items { display: flex; flex-direction: column; gap: 16px; }
.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 16px;
  background: var(--color-bg);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
}
.ci-icon {
  width: 40px; height: 40px;
  background: rgba(201,168,76,0.12);
  border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  font-size: 18px;
  flex-shrink: 0;
}
.ci-text .ci-label { font-size: 12px; color: var(--color-text-light); }
.ci-text .ci-value { font-size: 15px; font-weight: 600; margin-top: 2px; }

.contact-form {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: 40px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
}
.form-title { font-size: 20px; font-weight: 700; margin-bottom: 24px; color: var(--color-primary); }
.form-group { margin-bottom: 20px; }
.form-group label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--color-text);
}
.form-group label span { color: #e63e3e; margin-left: 2px; }
.form-control {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-family: var(--font-main);
  background: var(--color-bg);
  color: var(--color-text);
  transition: border-color var(--transition);
  outline: none;
}
.form-control:focus { border-color: var(--color-accent); background: var(--color-white); }
textarea.form-control { min-height: 100px; resize: vertical; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }

/* ============================
   页脚
   ============================ */
.footer {
  background: #0a0a14;
  color: var(--color-white);
  padding: 64px 0 0;
}
.footer-main {
  display: grid;
  grid-template-columns: 1.2fr 2fr;
  gap: 64px;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.footer-links {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 32px;
}
.footer-brand .logo-text { font-size: 18px; font-weight: 800; color: #fff; }
.footer-brand .logo-sub { font-size: 12px; color: rgba(255,255,255,0.5); margin-bottom: 16px; }
.footer-brand p { font-size: 14px; color: rgba(255,255,255,0.6); line-height: 1.8; margin-bottom: 12px; }
.footer-location { font-size: 13px; color: rgba(255,255,255,0.4); }
.footer-col h4 {
  font-size: 14px;
  font-weight: 700;
  color: rgba(255,255,255,0.9);
  margin-bottom: 16px;
  letter-spacing: 0.5px;
}
.footer-col a {
  display: block;
  font-size: 13px;
  color: rgba(255,255,255,0.5);
  margin-bottom: 10px;
  transition: color var(--transition);
}
.footer-col a:hover { color: var(--color-accent); }
.footer-work-time { margin-top: 16px; font-size: 12px; color: rgba(255,255,255,0.4); line-height: 1.8; }
.footer-work-time span { display: block; }
.footer-bottom {
  padding: 24px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 13px;
  color: rgba(255,255,255,0.7);
}
.footer-bottom a { color: #c9a84c; text-decoration: none; }
.footer-bottom a:hover { color: #fff; text-decoration: underline; }

/* ============================
   新闻详情页
   ============================ */
.article-header {
  background: var(--color-primary);
  padding: 120px 0 60px;
  color: var(--color-white);
}
.article-cat {
  color: var(--color-accent);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 16px;
}
.article-title {
  font-size: clamp(24px, 3vw, 40px);
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 20px;
}
.article-meta {
  display: flex;
  align-items: center;
  gap: 20px;
  font-size: 14px;
  color: rgba(255,255,255,0.6);
}
.article-body {
  max-width: 800px;
  margin: 0 auto;
  padding: 60px 24px;
  font-size: 16px;
  line-height: 2;
  color: var(--color-text);
}
.article-body h2, .article-body h3 {
  font-weight: 700;
  color: var(--color-primary);
  margin: 40px 0 16px;
}
.article-body h2 { font-size: 24px; }
.article-body h3 { font-size: 20px; }
.article-body p { margin-bottom: 20px; }
.article-body ul, .article-body ol {
  margin: 16px 0 20px 24px;
  list-style: disc;
}
.article-body ol { list-style: decimal; }
.article-body li { margin-bottom: 8px; }

/* ============================
   分页
   ============================ */
.pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 8px;
  margin-top: 48px;
}
.pagination a {
  width: 40px; height: 40px;
  display: flex; align-items: center; justify-content: center;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text);
  transition: all var(--transition);
}
.pagination a:hover, .pagination a.active {
  background: var(--color-accent);
  color: var(--color-primary);
  border-color: var(--color-accent);
}

/* ============================
   弹窗/Toast
   ============================ */
.toast {
  position: fixed;
  bottom: 32px; right: 32px;
  background: var(--color-primary);
  color: var(--color-white);
  padding: 14px 24px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  font-size: 14px;
  display: flex;
  align-items: center;
  gap: 10px;
  transform: translateY(100px);
  opacity: 0;
  transition: all var(--transition);
  z-index: 9999;
  max-width: 360px;
}
.toast.show { transform: translateY(0); opacity: 1; }
.toast.success { border-left: 4px solid #22c55e; }
.toast.error   { border-left: 4px solid #ef4444; }

/* ============================
   响应式
   ============================ */
@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .brand-wall { grid-template-columns: repeat(3, 1fr); }
  .footer-main { grid-template-columns: 1fr; gap: 40px; }
  .footer-links { grid-template-columns: repeat(3, 1fr); gap: 24px; }
  .navbar-tagline { font-size: 10px; margin-left: 10px; padding-left: 10px; letter-spacing: 0.2px; }
}

@media (max-width: 768px) {
  :root { --space-lg: 40px; --space-xl: 64px; }

  .navbar-menu, .navbar-cta { display: none; }
  .navbar-toggle { display: flex; }
  .navbar-tagline { font-size: 9px; margin-left: 8px; padding-left: 8px; letter-spacing: 0.2px; }
  .navbar-inner { height: auto; padding: 10px 16px; }
  .navbar-menu.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 72px; left: 0; right: 0;
    background: var(--color-primary);
    padding: 16px;
    border-top: 1px solid rgba(255,255,255,0.1);
  }
  .navbar-menu.open .navbar-cta { display: block; margin: 8px 0 0; }

  .hero { min-height: auto; padding: 100px 0 60px; }
  .hero-stats {
    display: grid !important;
    grid-template-columns: repeat(2, 1fr) !important;
    gap: 24px !important;
    margin-top: 40px !important;
    padding-top: 30px !important;
  }

  .grid-2, .grid-3, .service-grid, .service-grid-3, .case-grid, .news-grid { grid-template-columns: 1fr; }
  .about-grid, .contact-grid { grid-template-columns: 1fr; }
  .tri-grid { grid-template-columns: 1fr !important; }
  .about-grid { gap: 40px; }

  .footer-main { grid-template-columns: 1fr; gap: 32px; }
  .footer-links { grid-template-columns: 1fr 1fr; gap: 20px; }
  .footer-bottom { flex-direction: column; gap: 8px; text-align: center; }

  .brand-wall { grid-template-columns: repeat(2, 1fr); }
  .form-row { grid-template-columns: 1fr; }
}

/* ============================================================
   PC/手机端显示控制
   ============================================================ */
.pc-only { display: block; }
.mobile-only { display: none; }

/* ============================================================
   手机端选项卡 - 服务产品
   ============================================================ */
.service-tabs {
  display: none;
  gap: 6px;
  overflow-x: auto;
  flex-wrap: nowrap;
  margin-bottom: 28px;
  padding-bottom: 4px;
  -webkit-overflow-scrolling: touch;
}
.service-tabs::-webkit-scrollbar { display: none; }
.service-tab-btn {
  flex-shrink: 0;
  padding: 8px 16px;
  border-radius: 100px;
  font-size: 13px;
  font-weight: 600;
  border: 1.5px solid var(--color-border);
  background: transparent;
  color: var(--color-text-light);
  cursor: pointer;
  transition: all 0.3s ease;
  white-space: nowrap;
}
.service-tab-btn.active, .service-tab-btn:hover {
  border-color: var(--color-accent);
  background: var(--color-accent);
  color: var(--color-primary);
}
.service-tab-panel { display: none; }
.service-tab-panel.active { display: block; }

@media (max-width: 768px) {
  .service-tabs { display: flex; }
  .service-grid { display: none; }
  .service-tab-panel .service-card { max-width: 100%; }
  
  /* 关于我们标题手机版两行显示 */
  .about-title { white-space: normal !important; }
  .about-title-line { display: block; }
}

/* ============================================================
   手机端手风琴 - 关于我们
   ============================================================ */
.about-accordion { display: none; margin-bottom: 32px; }
.about-accordion-item { border-bottom: 1px solid var(--color-border); }
.about-accordion-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 0;
  font-size: 15px;
  font-weight: 700;
  color: var(--color-primary);
  cursor: pointer;
  user-select: none;
}
.about-accordion-header::after {
  content: '+';
  font-size: 20px;
  font-weight: 300;
  color: var(--color-accent);
  transition: transform 0.3s;
}
.about-accordion-item.open .about-accordion-header::after { content: '\2212'; }
.about-accordion-body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.3s ease;
  padding: 0;
}
.about-accordion-item.open .about-accordion-body {
  max-height: 600px;
  padding: 0 0 20px;
}
.about-accordion-body p {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.8;
  margin-bottom: 12px;
}
@media (max-width: 768px) {
  .about-accordion { display: block; }
  .mobile-hide-header { display: none; }
  .pc-only-grid { display: none; }
}

/* ============================================================
   手机端页脚精简
   ============================================================ */
.mobile-footer {
  display: none;
  text-align: center;
  padding: 40px 0 20px;
}
.mobile-footer-brand { margin-bottom: 12px; }
.mobile-footer-links {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 20px;
}
@media (max-width: 768px) {
  .pc-only { display: none !important; }
  .mobile-only { display: block !important; }
  .mobile-footer { display: block !important; }
  .footer .footer-bottom { padding: 16px 0; font-size: 12px; }
}