/* ==========================================================================
   徐州一点云科技有限公司西安分公司 - 官网核心样式表
   行业分类：商务服务—其他
   ========================================================================== */

/* 1. 设计系统变量 (Design Tokens) */
:root {
  --primary: #1E6091;
  --primary-light: #2A75D3;
  --primary-dark: #124066;
  --secondary: #00B4D8;
  --secondary-light: #90E0EF;
  --accent: #7209B7;
  --accent-light: #F72585;
  
  --background: #F8FAFC;
  --surface: #FFFFFF;
  --surface-soft: #F1F5F9;
  --surface-hover: #E2E8F0;
  
  --text-primary: #0F172A;
  --text-secondary: #475569;
  --text-muted: #64748B;
  --text-on-primary: #FFFFFF;
  
  --border: #E2E8F0;
  --border-focus: #00B4D8;
  
  --footer-bg: #0A192F;
  --footer-text: #94A3B8;
  --footer-title: #F8FAFC;
  
  --shadow-sm: 0 2px 4px rgba(15, 23, 42, 0.04);
  --shadow-md: 0 8px 16px -4px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 20px 30px -10px rgba(15, 23, 42, 0.12);
  --shadow-glow: 0 0 25px rgba(0, 180, 216, 0.25);
  
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  
  --font-sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, sans-serif;
  --header-height: 80px;
}

/* 2. 重置与基础样式 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  color: var(--text-primary);
  background-color: var(--background);
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

body {
  overflow-x: hidden;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast);
}

img, svg {
  max-width: 100%;
  height: auto;
  vertical-align: middle;
}

ul, ol {
  list-style: none;
}

button, input, select, textarea {
  font: inherit;
  color: inherit;
  border: none;
  background: none;
  outline: none;
}

button {
  cursor: pointer;
}

/* 3. 布局容器 */
.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 96px 0;
  position: relative;
}

.section-soft {
  background-color: var(--surface-soft);
}

.section-title-wrap {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 64px;
}

.section-title {
  font-size: 2.25rem;
  font-weight: 700;
  line-height: 1.3;
  color: var(--text-primary);
  margin-top: 12px;
  letter-spacing: -0.02em;
}

.section-subtitle {
  font-size: 1.125rem;
  color: var(--text-secondary);
  margin-top: 16px;
}

/* 4. 行业专用显著标签 (商务服务-其他) */
.tag-industry {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  font-weight: 600;
  background: linear-gradient(135deg, rgba(30, 96, 145, 0.1) 0%, rgba(0, 180, 216, 0.15) 100%);
  color: var(--primary);
  border: 1px solid rgba(0, 180, 216, 0.3);
  box-shadow: 0 2px 8px rgba(0, 180, 216, 0.1);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.tag-industry svg {
  width: 16px;
  height: 16px;
  color: var(--secondary);
}

.tag-industry-glow {
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  color: var(--text-on-primary);
  border: none;
  box-shadow: 0 4px 12px rgba(30, 96, 145, 0.3);
}

/* 5. 导航栏 (毛玻璃 Header) */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  z-index: 1000;
  transition: all var(--transition-normal);
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(226, 232, 240, 0.8);
}

.site-header.scrolled {
  height: 70px;
  background: rgba(255, 255, 255, 0.95);
  box-shadow: var(--shadow-md);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--primary-dark);
}

.brand-icon-wrapper {
  width: 42px;
  height: 42px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #FFF;
  box-shadow: var(--shadow-sm);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
  padding: 8px 0;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  transition: width var(--transition-fast);
  border-radius: 2px;
}

.nav-link:hover, .nav-link.active {
  color: var(--primary);
}

.nav-link:hover::after, .nav-link.active::after {
  width: 100%;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.mobile-toggle {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 28px;
  height: 20px;
  cursor: pointer;
}

.mobile-toggle span {
  display: block;
  width: 100%;
  height: 2.5px;
  background-color: var(--text-primary);
  border-radius: 2px;
  transition: all var(--transition-fast);
}

/* 6. 按钮样式 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 28px;
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  font-weight: 600;
  transition: all var(--transition-fast);
  text-align: center;
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  color: var(--text-on-primary);
  box-shadow: 0 4px 14px rgba(30, 96, 145, 0.25);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0, 180, 216, 0.35);
}

.btn-secondary {
  background-color: var(--surface);
  color: var(--primary);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
  background-color: var(--surface-soft);
  border-color: var(--primary-light);
  color: var(--primary-light);
  transform: translateY(-2px);
}

.btn-outline {
  border: 1.5px solid var(--primary);
  color: var(--primary);
}

.btn-outline:hover {
  background-color: var(--primary);
  color: var(--text-on-primary);
  transform: translateY(-2px);
}

.btn-lg {
  padding: 16px 36px;
  font-size: 1.05rem;
  border-radius: var(--radius-md);
}

/* 7. HERO 屏样式 (首页) */
.hero-section {
  padding-top: calc(var(--header-height) + 60px);
  padding-bottom: 96px;
  background: radial-gradient(circle at 80% 20%, rgba(0, 180, 216, 0.08) 0%, transparent 50%),
              radial-gradient(circle at 20% 80%, rgba(30, 96, 145, 0.06) 0%, transparent 50%);
  position: relative;
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.hero-content {
  max-width: 620px;
}

.hero-title {
  font-size: 3rem;
  font-weight: 800;
  line-height: 1.2;
  color: var(--text-primary);
  margin: 20px 0 24px;
  letter-spacing: -0.03em;
}

.hero-title-highlight {
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 36px;
}

.hero-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.hero-visual {
  position: relative;
  display: flex;
  justify-content: center;
}

.hero-card-glow {
  position: relative;
  width: 100%;
  max-width: 520px;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.8);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: 0 20px 40px rgba(30, 96, 145, 0.12), var(--shadow-glow);
}

.hero-svg-illustration {
  width: 100%;
  height: auto;
}

/* 8. 核心卡片 & 列表组件 */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.service-card {
  background-color: var(--surface);
  border-radius: var(--radius-md);
  padding: 36px 28px;
  border: 1px solid var(--border);
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
  position: relative;
}

.service-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(0, 180, 216, 0.4);
}

.service-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, rgba(30, 96, 145, 0.1) 0%, rgba(0, 180, 216, 0.15) 100%);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
  transition: all var(--transition-fast);
}

.service-card:hover .service-icon {
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  color: #FFF;
  transform: scale(1.05);
}

.service-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.service-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
  flex-grow: 1;
  margin-bottom: 20px;
}

.service-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--primary);
}

.service-link svg {
  width: 16px;
  height: 16px;
  transition: transform var(--transition-fast);
}

.service-card:hover .service-link svg {
  transform: translateX(4px);
}

/* 9. 数据统计 Banner */
.stats-banner {
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
  color: #FFF;
  padding: 64px 0;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  text-align: center;
}

.stat-item {
  padding: 16px;
}

.stat-number {
  font-size: 2.75rem;
  font-weight: 800;
  line-height: 1.1;
  color: var(--secondary-light);
  margin-bottom: 8px;
}

.stat-label {
  font-size: 0.95rem;
  color: rgba(255, 255, 255, 0.85);
  font-weight: 500;
}

/* 10. 问题与解决方案卡片 */
.solution-card {
  background-color: var(--surface);
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  overflow: hidden;
  transition: all var(--transition-normal);
}

.solution-card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--primary-light);
}

.solution-header {
  padding: 24px;
  background-color: var(--surface-soft);
  border-bottom: 1px solid var(--border);
}

.solution-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--primary-dark);
}

.solution-body {
  padding: 24px;
}

.solution-meta-item {
  margin-bottom: 16px;
}

.solution-meta-label {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 4px;
}

.solution-meta-content {
  font-size: 0.95rem;
  color: var(--text-secondary);
}

/* 11. FAQ 手风琴样式 */
.accordion-item {
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  margin-bottom: 16px;
  overflow: hidden;
  transition: all var(--transition-fast);
}

.accordion-header {
  padding: 20px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--text-primary);
  user-select: none;
}

.accordion-header:hover {
  background-color: var(--surface-soft);
  color: var(--primary);
}

.accordion-icon {
  width: 20px;
  height: 20px;
  transition: transform var(--transition-fast);
  color: var(--text-muted);
}

.accordion-item.active .accordion-icon {
  transform: rotate(180deg);
  color: var(--primary);
}

.accordion-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease-out, padding 0.3s ease;
  padding: 0 24px;
  background-color: var(--surface);
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.8;
}

.accordion-item.active .accordion-content {
  padding: 0 24px 24px 24px;
}

/* 12. 文章与案例卡片 */
.news-card, .case-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: all var(--transition-normal);
}

.news-card:hover, .case-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--secondary);
}

.card-img-placeholder {
  height: 200px;
  background: linear-gradient(135deg, var(--surface-soft) 0%, #E2E8F0 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: 0.9rem;
  font-weight: 500;
  position: relative;
}

.card-body {
  padding: 24px;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.card-meta {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 10px;
}

.card-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 12px;
  line-height: 1.4;
}

.card-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 20px;
  flex-grow: 1;
}

/* 13. 表单控制 */
.form-group {
  margin-bottom: 24px;
}

.form-label {
  display: block;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.form-control {
  width: 100%;
  padding: 14px 18px;
  border-radius: var(--radius-md);
  border: 1.5px solid var(--border);
  background-color: var(--surface);
  color: var(--text-primary);
  font-size: 0.95rem;
  transition: all var(--transition-fast);
}

.form-control:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(30, 96, 145, 0.1);
}

.checkbox-label {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.875rem;
  color: var(--text-secondary);
  cursor: pointer;
}

.checkbox-label input[type="checkbox"] {
  width: 18px;
  height: 18px;
  accent-color: var(--primary);
  margin-top: 3px;
  cursor: pointer;
}

/* 14. 页脚 (Footer) - 严格规则：包含完整公司名称及主体信息 */
.site-footer {
  background-color: var(--footer-bg);
  color: var(--footer-text);
  padding-top: 80px;
  padding-bottom: 40px;
  font-size: 0.9rem;
  margin-top: auto;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 48px;
  margin-bottom: 60px;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.footer-company-name {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--footer-title);
  letter-spacing: 0.02em;
}

.footer-desc {
  line-height: 1.8;
  color: var(--footer-text);
}

.footer-heading {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--footer-title);
  margin-bottom: 20px;
  position: relative;
  padding-bottom: 8px;
}

.footer-heading::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 24px;
  height: 2px;
  background-color: var(--secondary);
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-links a:hover {
  color: var(--secondary-light);
}

.footer-contact-info {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  line-height: 1.6;
}

.contact-item svg {
  width: 18px;
  height: 18px;
  color: var(--secondary);
  flex-shrink: 0;
  margin-top: 3px;
}

.footer-bottom {
  padding-top: 32px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.85rem;
}

.footer-icp a {
  color: var(--footer-text);
}

.footer-icp a:hover {
  color: var(--secondary-light);
}

/* 15. 返回顶部按钮 & Toast 提示 */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 48px;
  height: 48px;
  border-radius: var(--radius-full);
  background: var(--primary);
  color: #FFF;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
  z-index: 999;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  background: var(--secondary);
  transform: translateY(-4px);
}

.toast {
  position: fixed;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background-color: var(--text-primary);
  color: #FFF;
  padding: 12px 24px;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  box-shadow: var(--shadow-lg);
  transition: transform 0.3s ease, opacity 0.3s ease;
  opacity: 0;
  z-index: 2000;
  pointer-events: none;
}

.toast.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

/* 16. 通用 Banner / Page Header */
.page-banner {
  padding-top: calc(var(--header-height) + 48px);
  padding-bottom: 64px;
  background: linear-gradient(135deg, rgba(30, 96, 145, 0.06) 0%, rgba(0, 180, 216, 0.08) 100%);
  border-bottom: 1px solid var(--border);
  text-align: center;
}

.page-banner-title {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-top: 12px;
}

.page-banner-desc {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 680px;
  margin: 12px auto 0;
}