/* ==========================================================================
   智证云 (SmartCert Cloud) - 官方网站设计系统与样式表
   遵循 Frontend UI Designer 规范：无布局错位、防文本挤压、响应式容器架构
   ========================================================================== */

:root {
  /* 品牌核心色彩 (Enterprise SaaS Palette) */
  --primary: #1657FF;
  --primary-hover: #0E42D2;
  --primary-active: #0A32A3;
  --primary-light: #F0F5FF;
  --primary-subtle: #E8F3FF;
  --primary-border: #ADC6FF;

  /* 辅助与状态色 */
  --success: #00B42A;
  --success-light: #E8FFEA;
  --warning: #FF7D00;
  --warning-light: #FFF7E8;
  --gold: #D97706;
  --gold-light: #FEF3C7;
  --danger: #F53F3F;
  --danger-light: #FFECE8;

  /* 文字颜色体系 (Anti-fatigue & high contrast) */
  --text-heading: #1D2129;
  --text-body: #4E5969;
  --text-secondary: #86909C;
  --text-muted: #C9CDD4;
  --text-inverse: #FFFFFF;

  /* 背景与边框 */
  --bg-page: #FFFFFF;
  --bg-section-alt: #F7F9FC;
  --bg-card: #FFFFFF;
  --bg-card-hover: #FAFCFF;
  --border-light: #E5E6EB;
  --border-subtle: #F2F3F5;
  --border-hover: #C9CDD4;

  /* 阴影体系 */
  --shadow-sm: 0 2px 6px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 12px 36px rgba(22, 87, 255, 0.08);
  --shadow-hover: 0 16px 40px rgba(22, 87, 255, 0.12);

  /* 容器与间距 */
  --header-height: 72px;
  --container-max: 1200px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 9999px;

  /* 动画曲线 */
  --transition-base: all 0.25s cubic-bezier(0.2, 0, 0, 1);
  --transition-smooth: all 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}

/* 基础重置 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 20px);
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
  color: var(--text-body);
  background-color: var(--bg-page);
  line-height: 1.65;
  padding-top: var(--header-height); /* 严格遵守规范：保证滚动时内容不被顶栏遮挡 */
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

ul, ol {
  list-style: none;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

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

/* 容器架构 (1200px 标准) */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
}

/* 标签与徽章通用样式 */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  font-size: 0.8125rem;
  font-weight: 600;
  white-space: nowrap;
}

.badge-primary {
  background: var(--primary-light);
  color: var(--primary);
  border: 1px solid var(--primary-border);
}

.badge-success {
  background: var(--success-light);
  color: var(--success);
}

.badge-gold {
  background: var(--gold-light);
  color: var(--gold);
}

/* 按钮通用体系 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 22px;
  border-radius: var(--radius-sm);
  font-size: 0.9375rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition-base);
  white-space: nowrap;
  line-height: 1.2;
}

.btn-primary {
  background: var(--primary);
  color: #FFFFFF;
  box-shadow: 0 4px 14px rgba(22, 87, 255, 0.3);
}

.btn-primary:hover {
  background: var(--primary-hover);
  box-shadow: 0 6px 20px rgba(22, 87, 255, 0.4);
  transform: translateY(-1px);
}

.btn-secondary {
  background: #FFFFFF;
  color: var(--text-heading);
  border: 1px solid var(--border-light);
}

.btn-secondary:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: var(--primary-light);
}

.btn-sm {
  padding: 7px 14px;
  font-size: 0.84rem;
}

.btn-lg {
  padding: 14px 32px;
  font-size: 1.0625rem;
  border-radius: var(--radius-md);
}

.btn-block {
  width: 100%;
}

/* 章节头部 (Section Headers) */
.section-header {
  text-align: center;
  max-width: 780px;
  margin: 0 auto 56px;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--primary);
  background: var(--primary-light);
  padding: 4px 14px;
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  margin-bottom: 14px;
  border: 1px solid var(--primary-border);
}

.section-title {
  font-size: 2.25rem;
  font-weight: 800;
  color: var(--text-heading);
  letter-spacing: -0.5px;
  margin-bottom: 16px;
  line-height: 1.3;
}

.section-desc {
  font-size: 1.0625rem;
  color: var(--text-body);
  line-height: 1.7;
}

/* ==========================================================================
   1. 固定顶栏导航 (Fixed Executive Navbar)
   严格遵守规范：满宽、高72px、固定定位、遮挡防护、平滑吸顶
   ========================================================================== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  width: 100%;
  height: var(--header-height);
  background: #FFFFFF;
  border-bottom: 1px solid var(--border-light);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.04);
  z-index: 1000;
  display: flex;
  align-items: center;
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.brand-logo {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.brand-logo img {
  height: 44px;
  width: auto;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-link {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text-body);
  position: relative;
  padding: 8px 0;
}

.nav-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary);
  transition: width 0.25s ease;
}

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

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.mobile-toggle {
  display: none;
  background: transparent;
  cursor: pointer;
  padding: 8px;
  color: var(--text-heading);
}

.mobile-toggle svg {
  width: 26px;
  height: 26px;
}

/* ==========================================================================
   2. 视觉首屏 (Hero Section)
   科技感渐变底色、权威数据、交互式证书演示卡片
   ========================================================================== */
.hero-section {
  position: relative;
  background: radial-gradient(120% 80% at 50% 0%, #EEF4FF 0%, #FFFFFF 70%);
  padding: 64px 0 72px;
  overflow: hidden;
  border-bottom: 1px solid var(--border-subtle);
}

.hero-section::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 100%;
  background-image: 
    radial-gradient(rgba(22, 87, 255, 0.08) 1px, transparent 1px),
    linear-gradient(to right, rgba(22, 87, 255, 0.03) 1px, transparent 1px);
  background-size: 24px 24px, 120px 120px;
  pointer-events: none;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 48px;
  align-items: center;
  position: relative;
  z-index: 2;
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: #FFFFFF;
  border: 1px solid var(--primary-border);
  box-shadow: var(--shadow-sm);
  padding: 6px 16px;
  border-radius: var(--radius-full);
  margin-bottom: 22px;
  font-size: 0.875rem;
  color: var(--primary);
  font-weight: 600;
}

.hero-pill .dot {
  width: 8px;
  height: 8px;
  background: var(--success);
  border-radius: 50%;
  animation: pulseDot 2s infinite;
}

@keyframes pulseDot {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(0, 180, 42, 0.7); }
  70% { transform: scale(1); box-shadow: 0 0 0 8px rgba(0, 180, 42, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(0, 180, 42, 0); }
}

.hero-title {
  font-size: 2.875rem;
  font-weight: 800;
  line-height: 1.25;
  color: var(--text-heading);
  letter-spacing: -1px;
  margin-bottom: 20px;
}

.hero-title .highlight {
  color: var(--primary);
  position: relative;
  display: inline-block;
}

.hero-subtitle {
  font-size: 1.125rem;
  color: var(--text-body);
  line-height: 1.75;
  margin-bottom: 32px;
  max-width: 580px;
}

.hero-buttons {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}

.hero-guarantee {
  display: flex;
  align-items: center;
  gap: 24px;
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.guarantee-item {
  display: flex;
  align-items: center;
  gap: 6px;
}

.guarantee-item svg {
  color: var(--success);
  width: 16px;
  height: 16px;
}

/* Hero 右侧动态证书卡片演示 */
.hero-card-preview {
  position: relative;
  perspective: 1000px;
}

.cert-card-mockup {
  background: #FFFFFF;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-light);
  box-shadow: 0 20px 50px rgba(22, 87, 255, 0.12), 0 4px 12px rgba(0, 0, 0, 0.05);
  overflow: hidden;
  transition: transform 0.4s ease;
  position: relative;
}

.cert-mockup-header {
  background: linear-gradient(135deg, #0B192C 0%, #162C4E 100%);
  padding: 16px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: #FFFFFF;
}

.mockup-header-title {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.9375rem;
  font-weight: 700;
  letter-spacing: 0.5px;
}

.mockup-status-badge {
  background: rgba(0, 180, 42, 0.2);
  border: 1px solid rgba(0, 180, 42, 0.5);
  color: #00E676;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  gap: 5px;
}

.cert-mockup-body {
  padding: 24px 28px;
  background: #FAFAFC;
  position: relative;
}

.mockup-inner-frame {
  background: #FFFFFF;
  border: 2px solid #E2E8F0;
  border-radius: var(--radius-md);
  padding: 24px;
  position: relative;
  box-shadow: inset 0 0 0 3px #F8FAFC, inset 0 0 0 5px #E2E8F0;
}

.mockup-cert-logo {
  text-align: center;
  margin-bottom: 12px;
}

.mockup-cert-title {
  font-size: 1.25rem;
  font-weight: 800;
  color: #0F172A;
  text-align: center;
  letter-spacing: 2px;
  margin-bottom: 4px;
}

.mockup-cert-sub {
  font-size: 0.75rem;
  color: #64748B;
  text-align: center;
  margin-bottom: 18px;
  letter-spacing: 1px;
}

.mockup-cert-content {
  font-size: 0.875rem;
  color: #334155;
  line-height: 1.8;
  margin-bottom: 20px;
  text-indent: 2em;
}

.mockup-cert-content strong {
  color: var(--primary);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.mockup-cert-meta {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px dashed #CBD5E1;
}

.mockup-meta-left {
  font-size: 0.75rem;
  color: #64748B;
  line-height: 1.6;
}

.mockup-seal-box {
  position: relative;
  text-align: center;
}

.mockup-ca-seal {
  width: 80px;
  height: 80px;
  border: 2px solid #E11D48;
  border-radius: 50%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: #E11D48;
  font-size: 0.65rem;
  font-weight: 800;
  transform: rotate(-12deg);
  background: rgba(225, 29, 72, 0.04);
  box-shadow: 0 0 10px rgba(225, 29, 72, 0.15);
  position: absolute;
  right: 0;
  bottom: -10px;
}

.mockup-ca-seal svg {
  width: 18px;
  height: 18px;
  margin: 2px 0;
  fill: #E11D48;
}

/* 浮动标签与提示 */
.float-tag {
  position: absolute;
  background: #FFFFFF;
  border-radius: var(--radius-md);
  padding: 10px 14px;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
  display: flex;
  align-items: center;
  gap: 10px;
  z-index: 10;
  border: 1px solid var(--border-light);
  font-size: 0.8125rem;
  font-weight: 600;
}

.float-tag-1 {
  top: -15px;
  left: -20px;
  animation: floatUpDown 4s ease-in-out infinite;
}

.float-tag-2 {
  bottom: -15px;
  right: -15px;
  animation: floatUpDown 4s ease-in-out infinite 2s;
}

@keyframes floatUpDown {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

/* ==========================================================================
   3. 权威量化指标条 (Metrics Banner)
   严格遵守防挤压规范：每个指标具备独立呼吸空间，避免汉字断词折行
   ========================================================================== */
.stats-banner {
  background: #FFFFFF;
  border-top: 1px solid var(--border-light);
  border-bottom: 1px solid var(--border-light);
  padding: 36px 0;
  position: relative;
  z-index: 5;
}

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

.stat-item {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 8px 16px;
  border-right: 1px solid var(--border-light);
}

.stat-item:last-child {
  border-right: none;
}

.stat-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: var(--primary-light);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.stat-icon svg {
  width: 24px;
  height: 24px;
}

.stat-value {
  font-size: 1.875rem;
  font-weight: 800;
  color: var(--text-heading);
  line-height: 1.1;
  white-space: nowrap; /* 防挤压 */
  margin-bottom: 4px;
}

.stat-label {
  font-size: 0.875rem;
  color: var(--text-secondary);
  font-weight: 500;
  white-space: nowrap;
}

/* ==========================================================================
   4. 在线证书查验体验组件 (Interactive Verification Widget)
   ========================================================================== */
.verify-widget-section {
  padding: 72px 0;
  background: var(--bg-section-alt);
  border-bottom: 1px solid var(--border-light);
}

.verify-box {
  background: #FFFFFF;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-md);
  padding: 36px;
  max-width: 960px;
  margin: 0 auto;
}

.verify-form-row {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr auto;
  gap: 14px;
  align-items: center;
  margin-bottom: 18px;
}

.input-field {
  position: relative;
}

.input-field input {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  background: #FFFFFF;
  font-size: 0.9375rem;
  color: var(--text-heading);
  transition: var(--transition-base);
}

.input-field input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(22, 87, 255, 0.15);
}

.verify-presets {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.84rem;
  color: var(--text-secondary);
  flex-wrap: wrap;
}

.preset-chip {
  background: var(--primary-light);
  color: var(--primary);
  border: 1px dashed var(--primary-border);
  padding: 3px 10px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition-base);
}

.preset-chip:hover {
  background: var(--primary);
  color: #FFFFFF;
}

.verify-result-panel {
  display: none;
  margin-top: 28px;
  padding: 24px;
  background: #F8FAFD;
  border-radius: var(--radius-md);
  border: 1px solid #D2E4FF;
  animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

.result-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 18px;
  padding-bottom: 14px;
  border-bottom: 1px solid #E2ECFC;
}

.result-status {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--success);
}

.result-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  font-size: 0.875rem;
}

.result-item-title {
  color: var(--text-secondary);
  margin-bottom: 3px;
}

.result-item-val {
  font-weight: 600;
  color: var(--text-heading);
  word-break: break-all;
}

/* ==========================================================================
   5. 六大核心平台技术优势 (6 Core Capabilities)
   ========================================================================== */
.features-section {
  padding: 96px 0;
  background: #FFFFFF;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.feature-card {
  background: #FFFFFF;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  transition: var(--transition-smooth);
  position: relative;
  display: flex;
  flex-direction: column;
}

.feature-card:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-hover);
  transform: translateY(-4px);
}

.feature-icon-wrapper {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  background: var(--primary-light);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 22px;
  transition: var(--transition-base);
}

.feature-card:hover .feature-icon-wrapper {
  background: var(--primary);
  color: #FFFFFF;
  transform: scale(1.05);
}

.feature-icon-wrapper svg {
  width: 28px;
  height: 28px;
}

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

.feature-desc {
  font-size: 0.9375rem;
  color: var(--text-body);
  line-height: 1.7;
  margin-bottom: 20px;
  flex-grow: 1;
}

.feature-bullets {
  border-top: 1px solid var(--border-subtle);
  padding-top: 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: 0.84rem;
  color: var(--text-secondary);
}

.feature-bullets li {
  display: flex;
  align-items: center;
  gap: 8px;
}

.feature-bullets li svg {
  color: var(--primary);
  width: 14px;
  height: 14px;
  flex-shrink: 0;
}

/* ==========================================================================
   6. 云端精美模板中心 (Templates Gallery)
   8套高精实图真实展示与分类筛选，带模态放大预览
   ========================================================================== */
.templates-section {
  padding: 96px 0;
  background: var(--bg-section-alt);
  border-top: 1px solid var(--border-light);
  border-bottom: 1px solid var(--border-light);
}

.template-filter-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-bottom: 44px;
  flex-wrap: wrap;
}

.filter-btn {
  background: #FFFFFF;
  border: 1px solid var(--border-light);
  padding: 8px 20px;
  border-radius: var(--radius-full);
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text-body);
  cursor: pointer;
  transition: var(--transition-base);
}

.filter-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.filter-btn.active {
  background: var(--primary);
  color: #FFFFFF;
  border-color: var(--primary);
  box-shadow: 0 4px 12px rgba(22, 87, 255, 0.25);
}

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

.template-card {
  background: #FFFFFF;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: var(--transition-smooth);
  display: flex;
  flex-direction: column;
}

.template-card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-4px);
  border-color: var(--primary-border);
}

.template-img-box {
  position: relative;
  overflow: hidden;
  background: #F8FAFC;
  height: 250px;
  padding: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.template-img-box img {
  max-width: 100%;
  max-height: 100%;
  width: auto;
  height: auto;
  object-fit: contain;
  border-radius: 4px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
  transition: transform 0.35s ease, box-shadow 0.35s ease;
}

.template-card:hover .template-img-box img {
  transform: scale(1.03);
  box-shadow: 0 8px 24px rgba(22, 87, 255, 0.16);
}

.template-overlay {
  position: absolute;
  inset: 0;
  background: rgba(15, 23, 42, 0.6);
  opacity: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  transition: opacity 0.3s ease;
}

.template-card:hover .template-overlay {
  opacity: 1;
}

.template-info {
  padding: 16px 18px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  flex-grow: 1;
}

.template-title {
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--text-heading);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.template-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.78rem;
  color: var(--text-secondary);
}

/* ==========================================================================
   7. 多场景行业解决方案 (Industry Solutions)
   ========================================================================== */
.solutions-section {
  padding: 96px 0;
  background: #FFFFFF;
}

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

.solution-card {
  background: #FFFFFF;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-light);
  padding: 30px 24px;
  transition: var(--transition-smooth);
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
}

.solution-card:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
}

.solution-badge {
  align-self: flex-start;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--primary);
  background: var(--primary-light);
  padding: 3px 10px;
  border-radius: var(--radius-sm);
  margin-bottom: 16px;
}

.solution-title {
  font-size: 1.1875rem;
  font-weight: 700;
  color: var(--text-heading);
  margin-bottom: 10px;
}

.solution-desc {
  font-size: 0.875rem;
  color: var(--text-body);
  line-height: 1.65;
  margin-bottom: 18px;
  flex-grow: 1;
}

.solution-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.solution-tag-pill {
  background: #F1F5F9;
  color: #475569;
  font-size: 0.75rem;
  padding: 3px 8px;
  border-radius: 4px;
}

/* ==========================================================================
   8. 权威发证单位成功案例 (Client Cases)
   6大真实院校、机关、集团案例真实展示
   ========================================================================== */
.cases-section {
  padding: 96px 0;
  background: var(--bg-section-alt);
  border-top: 1px solid var(--border-light);
  border-bottom: 1px solid var(--border-light);
}

.cases-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  margin-bottom: 56px;
}

.case-card {
  background: #FFFFFF;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-light);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: var(--transition-smooth);
  display: flex;
  flex-direction: column;
}

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

.case-img-box {
  height: 170px;
  overflow: hidden;
  background: #CBD5E1;
  position: relative;
}

.case-img-box img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.case-card:hover .case-img-box img {
  transform: scale(1.05);
}

.case-tag {
  position: absolute;
  top: 12px;
  left: 12px;
  background: rgba(15, 23, 42, 0.75);
  backdrop-filter: blur(4px);
  color: #FFFFFF;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: var(--radius-full);
}

.case-body {
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  flex-grow: 1;
}

.case-title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text-heading);
  line-height: 1.4;
}

.case-desc {
  font-size: 0.875rem;
  color: var(--text-body);
  line-height: 1.65;
  flex-grow: 1;
}

.case-outcome {
  background: var(--primary-light);
  border-left: 3px solid var(--primary);
  padding: 10px 14px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: 0.8125rem;
  color: #1E3A8A;
  font-weight: 500;
  line-height: 1.5;
}

/* 合作发证单位 Logo 轮播/平铺 */
.partner-strip-wrapper {
  background: #FFFFFF;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 28px 36px;
  text-align: center;
}

.partner-strip-title {
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--text-secondary);
  margin-bottom: 20px;
  letter-spacing: 0.5px;
}

.partner-logo-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 20px;
  align-items: center;
}

.partner-logo-item {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 8px 12px;
  height: 60px;
  filter: grayscale(100%);
  opacity: 0.75;
  transition: var(--transition-base);
}

.partner-logo-item:hover {
  filter: grayscale(0%);
  opacity: 1;
}

.partner-logo-item img {
  max-height: 38px;
  width: auto;
  object-fit: contain;
}

/* ==========================================================================
   9. 透明方案定价 (Pricing Plans)
   严格遵守防挤压规范：套餐卡片结构清晰，突出热门推荐
   ========================================================================== */
.pricing-section {
  padding: 96px 0;
  background: #FFFFFF;
}

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

.pricing-card {
  background: #FFFFFF;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-light);
  padding: 36px 28px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: var(--transition-smooth);
}

.pricing-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: var(--primary-border);
}

/* 热门推荐卡片突出显示 */
.pricing-card.featured {
  border: 2px solid var(--primary);
  box-shadow: var(--shadow-lg);
  background: linear-gradient(180deg, #FFFFFF 0%, #F9FBFF 100%);
  transform: scale(1.02);
}

.pricing-card.featured:hover {
  transform: scale(1.02) translateY(-4px);
}

.featured-ribbon {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, #1657FF 0%, #0036B3 100%);
  color: #FFFFFF;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 4px 16px;
  border-radius: var(--radius-full);
  box-shadow: 0 4px 10px rgba(22, 87, 255, 0.3);
  letter-spacing: 0.5px;
  white-space: nowrap;
}

.plan-header {
  margin-bottom: 24px;
  text-align: center;
}

.plan-name {
  font-size: 1.375rem;
  font-weight: 800;
  color: var(--text-heading);
  margin-bottom: 8px;
}

.plan-target {
  font-size: 0.84rem;
  color: var(--text-secondary);
  min-height: 38px;
}

.plan-price-box {
  margin: 18px 0;
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 4px;
}

.price-currency {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--primary);
}

.price-num {
  font-size: 2.75rem;
  font-weight: 800;
  color: var(--primary);
  line-height: 1;
  white-space: nowrap;
}

.price-unit {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.plan-features-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin: 24px 0;
  padding: 20px 0;
  border-top: 1px solid var(--border-light);
  border-bottom: 1px solid var(--border-light);
  flex-grow: 1;
  font-size: 0.875rem;
}

.plan-feature-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  color: var(--text-body);
}

.plan-feature-item svg {
  width: 16px;
  height: 16px;
  color: var(--success);
  margin-top: 3px;
  flex-shrink: 0;
}

.plan-feature-item.muted {
  color: var(--text-muted);
}

.plan-feature-item.muted svg {
  color: var(--text-muted);
}

.pricing-note {
  text-align: center;
  margin-top: 36px;
  font-size: 0.875rem;
  color: var(--text-secondary);
}

/* ==========================================================================
   10. 权威常见问题 FAQ (Accordion)
   ========================================================================== */
.faq-section {
  padding: 96px 0;
  background: var(--bg-section-alt);
  border-top: 1px solid var(--border-light);
}

.faq-list {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: #FFFFFF;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
  overflow: hidden;
  transition: var(--transition-base);
}

.faq-item.active {
  border-color: var(--primary-border);
  box-shadow: var(--shadow-sm);
}

.faq-question {
  padding: 20px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--text-heading);
  gap: 16px;
}

.faq-toggle-icon {
  width: 20px;
  height: 20px;
  color: var(--text-secondary);
  transition: transform 0.3s ease;
  flex-shrink: 0;
}

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

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease;
  padding: 0 24px;
}

.faq-item.active .faq-answer {
  max-height: 400px;
  padding-bottom: 24px;
}

.faq-answer-inner {
  font-size: 0.9375rem;
  color: var(--text-body);
  line-height: 1.75;
  border-top: 1px solid var(--border-subtle);
  padding-top: 16px;
}

/* ==========================================================================
   11. 商务对接与咨询表单 (Contact & Consultation Area)
   ========================================================================== */
.contact-section {
  padding: 96px 0;
  background: #FFFFFF;
  border-top: 1px solid var(--border-light);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.25fr;
  gap: 48px;
  align-items: flex-start;
}

.contact-info-card {
  background: linear-gradient(145deg, #0B192C 0%, #152A4A 100%);
  color: #FFFFFF;
  border-radius: var(--radius-lg);
  padding: 40px 36px;
  box-shadow: var(--shadow-lg);
  position: relative;
  overflow: hidden;
}

.contact-info-title {
  font-size: 1.625rem;
  font-weight: 800;
  margin-bottom: 12px;
}

.contact-info-desc {
  font-size: 0.9375rem;
  color: #94A3B8;
  line-height: 1.7;
  margin-bottom: 32px;
}

.contact-details-list {
  display: flex;
  flex-direction: column;
  gap: 22px;
  margin-bottom: 36px;
}

.contact-detail-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
}

.contact-icon {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #60A5FA;
  flex-shrink: 0;
}

.contact-icon svg {
  width: 20px;
  height: 20px;
}

.contact-text-label {
  font-size: 0.78rem;
  color: #94A3B8;
  margin-bottom: 2px;
}

.contact-text-val {
  font-size: 1.0625rem;
  font-weight: 700;
  color: #FFFFFF;
}

.contact-wechat-box {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  display: flex;
  align-items: center;
  gap: 16px;
}

.contact-wechat-box img {
  width: 80px;
  height: 80px;
  border-radius: 6px;
  background: #FFFFFF;
  padding: 4px;
}

.wechat-box-info {
  font-size: 0.84rem;
}

.wechat-box-title {
  font-weight: 700;
  color: #FFFFFF;
  margin-bottom: 4px;
}

.wechat-box-desc {
  color: #94A3B8;
  line-height: 1.5;
}

/* 咨询表单右侧卡片 */
.contact-form-card {
  background: #FFFFFF;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 40px;
  box-shadow: var(--shadow-md);
}

.form-title {
  font-size: 1.375rem;
  font-weight: 800;
  color: var(--text-heading);
  margin-bottom: 8px;
}

.form-subtitle {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: 28px;
}

.form-row-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
  margin-bottom: 18px;
}

.form-group {
  margin-bottom: 18px;
}

.form-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-heading);
  margin-bottom: 8px;
}

.form-control {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  background: #FFFFFF;
  font-size: 0.9375rem;
  color: var(--text-heading);
  transition: var(--transition-base);
}

.form-control:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(22, 87, 255, 0.15);
}

textarea.form-control {
  resize: vertical;
  min-height: 100px;
}

/* ==========================================================================
   12. 官方页脚 (Corporate Footer)
   ========================================================================== */
.site-footer {
  background: #0B192C;
  color: #94A3B8;
  padding: 64px 0 32px;
  border-top: 1px solid #1E293B;
}

.footer-top-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
  gap: 40px;
  margin-bottom: 48px;
}

.footer-brand img {
  height: 42px;
  width: auto;
  margin-bottom: 18px;
}

.footer-brand-desc {
  font-size: 0.875rem;
  line-height: 1.8;
  color: #94A3B8;
  margin-bottom: 20px;
}

.footer-col-title {
  font-size: 1rem;
  font-weight: 700;
  color: #FFFFFF;
  margin-bottom: 18px;
  letter-spacing: 0.5px;
}

.footer-links-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-size: 0.875rem;
}

.footer-links-list a:hover {
  color: #FFFFFF;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8125rem;
  color: #64748B;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-bottom a {
  color: #64748B;
}

.footer-bottom a:hover {
  color: #94A3B8;
}

/* ==========================================================================
   13. 交互模态窗口 (Lightbox & Modals)
   ========================================================================== */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.75);
  backdrop-filter: blur(4px);
  z-index: 2000;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.modal-backdrop.open {
  display: flex;
  animation: modalFadeIn 0.25s ease;
}

@keyframes modalFadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.modal-dialog {
  background: #FFFFFF;
  border-radius: var(--radius-lg);
  max-width: 780px;
  width: 100%;
  overflow: hidden;
  box-shadow: 0 25px 60px rgba(0, 0, 0, 0.3);
  position: relative;
  animation: modalSlideUp 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes modalSlideUp {
  from { transform: translateY(20px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

.modal-close-btn {
  position: absolute;
  top: 16px;
  right: 16px;
  background: rgba(0, 0, 0, 0.05);
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--text-heading);
  transition: var(--transition-base);
  z-index: 10;
}

.modal-close-btn:hover {
  background: rgba(0, 0, 0, 0.1);
}

.modal-img-content {
  padding: 24px;
  text-align: center;
  background: #F8FAFC;
}

.modal-img-content img {
  max-height: 75vh;
  margin: 0 auto;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-md);
}

.modal-img-title {
  margin-top: 14px;
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--text-heading);
}

/* Toast 提示浮条 */
.toast-notice {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background: #1E293B;
  color: #FFFFFF;
  padding: 12px 22px;
  border-radius: var(--radius-sm);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.9375rem;
  font-weight: 600;
  z-index: 3000;
  transform: translateY(100px);
  opacity: 0;
  transition: all 0.3s ease;
  pointer-events: none;
}

.toast-notice.show {
  transform: translateY(0);
  opacity: 1;
}

/* 回到顶部悬浮球 */
.back-to-top {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 44px;
  height: 44px;
  background: #FFFFFF;
  color: var(--text-heading);
  border: 1px solid var(--border-light);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition-base);
  z-index: 900;
}

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

.back-to-top:hover {
  background: var(--primary);
  color: #FFFFFF;
  border-color: var(--primary);
}

/* ==========================================================================
   14. 响应式与移动端适配 (Media Queries)
   严格遵守规范：桌面 >= 1024px，平板 768px-1023px，手机 < 768px
   ========================================================================== */
@media (max-width: 1023px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  
  .hero-title {
    font-size: 2.25rem;
  }
  
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .stat-item:nth-child(2) {
    border-right: none;
  }
  
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .templates-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .solutions-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .cases-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .pricing-card.featured {
    transform: none;
  }
  
  .contact-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-top-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 767px) {
  body {
    padding-top: var(--header-height);
  }
  
  .nav-menu {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: #FFFFFF;
    flex-direction: column;
    padding: 24px;
    gap: 16px;
    border-bottom: 1px solid var(--border-light);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.05);
    display: none;
  }
  
  .nav-menu.mobile-open {
    display: flex;
  }
  
  .nav-actions .btn-sm {
    display: none;
  }
  
  .mobile-toggle {
    display: block;
  }
  
  .hero-title {
    font-size: 1.875rem;
  }
  
  .hero-buttons {
    flex-direction: column;
    align-items: stretch;
  }
  
  .stats-grid {
    grid-template-columns: 1fr;
  }
  
  .stat-item {
    border-right: none;
    border-bottom: 1px solid var(--border-light);
    padding-bottom: 16px;
  }
  
  .stat-item:last-child {
    border-bottom: none;
  }
  
  .verify-form-row {
    grid-template-columns: 1fr;
  }
  
  .result-grid {
    grid-template-columns: 1fr;
  }
  
  .features-grid {
    grid-template-columns: 1fr;
  }
  
  .templates-grid {
    grid-template-columns: 1fr;
  }
  
  .solutions-grid {
    grid-template-columns: 1fr;
  }
  
  .cases-grid {
    grid-template-columns: 1fr;
  }
  
  .partner-logo-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  
  .pricing-grid {
    grid-template-columns: 1fr;
  }
  
  .form-row-2 {
    grid-template-columns: 1fr;
  }
  
  .contact-form-card {
    padding: 24px 20px;
  }
  
  .footer-top-grid {
    grid-template-columns: 1fr;
  }
}