/* src/styles/main.css */
/* TNTCloud.shop - 02｜极简云服务（Minimal Cloud Service）专业样式库 */

:root {
  --bg-page: #FFFFFF;
  --bg-light-blue: #F5F9FF;
  --bg-cloud-blue: #EAF4FF;
  --color-primary: #2563EB;
  --color-interactive: #3B82F6;
  --color-dark: #172B4D;
  --color-text-secondary: #64748B;
  --color-border: #E2EAF4;
  --color-border-hover: #BFDBFE;
  --color-success: #10B981;
  --color-warning: #F59E0B;
  
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  
  --shadow-sm: 0 1px 3px rgba(37, 99, 235, 0.05);
  --shadow-md: 0 4px 12px rgba(37, 99, 235, 0.08);
  --shadow-lg: 0 12px 24px rgba(37, 99, 235, 0.12);
  
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  
  --container-max: 1200px;
}

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

html {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.8;
  color: var(--color-dark);
  background-color: var(--bg-page);
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  background-color: var(--bg-page);
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--color-interactive);
}

img, svg {
  display: block;
  max-width: 100%;
}

button, input, select, textarea {
  font: inherit;
}

/* 布局容器 */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

/* 区域间距 */
.section-padding {
  padding-top: 80px;
  padding-bottom: 80px;
}

.section-bg-light {
  background-color: var(--bg-light-blue);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

/* 区域标题通用组件 */
.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 56px;
}

.section-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 14px;
  background-color: var(--bg-cloud-blue);
  color: var(--color-primary);
  font-size: 13px;
  font-weight: 600;
  border-radius: 9999px;
  margin-bottom: 16px;
  letter-spacing: 0.5px;
}

.section-title {
  font-size: 32px;
  font-weight: 700;
  color: var(--color-dark);
  line-height: 1.35;
  margin-bottom: 16px;
  letter-spacing: -0.5px;
}

.section-subtitle {
  font-size: 17px;
  color: var(--color-text-secondary);
  line-height: 1.8;
}

/* 按钮通用 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.2s ease;
  min-height: 46px;
  text-align: center;
}

.btn-primary {
  background-color: var(--color-primary);
  color: #FFFFFF !important;
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.25);
}

.btn-primary:hover {
  background-color: var(--color-interactive);
  transform: translateY(-1px);
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.35);
}

.btn-secondary {
  background-color: #FFFFFF;
  color: var(--color-primary) !important;
  border-color: var(--color-border);
}

.btn-secondary:hover {
  background-color: var(--bg-cloud-blue);
  border-color: var(--color-interactive);
}

.btn-outline {
  background-color: transparent;
  color: var(--color-primary) !important;
  border-color: var(--color-primary);
}

.btn-outline:hover {
  background-color: var(--bg-cloud-blue);
}

.btn-sm {
  padding: 8px 16px;
  font-size: 14px;
  min-height: 38px;
}

.btn-block {
  width: 100%;
}

/* =========================================================================
   01｜顶部固定导航栏
   ========================================================================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  height: 72px;
  display: flex;
  align-items: center;
}

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

.brand-logo-link {
  display: flex;
  align-items: center;
  text-decoration: none;
  animation: logoFadeIn 0.4s ease-out;
}

@keyframes logoFadeIn {
  from { opacity: 0; transform: scale(0.97); }
  to { opacity: 1; transform: scale(1); }
}

.brand-logo-img {
  height: 38px;
  width: auto;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

.nav-link {
  font-size: 15px;
  font-weight: 500;
  color: var(--color-dark);
  padding: 6px 0;
  position: relative;
  transition: color 0.2s ease;
}

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

.nav-link.active::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--color-primary);
  border-radius: 1px;
}

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

.mobile-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 8px;
  cursor: pointer;
  color: var(--color-dark);
}

.mobile-nav-drawer {
  display: none;
  position: absolute;
  top: 72px;
  left: 0;
  right: 0;
  background-color: #FFFFFF;
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-lg);
  padding: 24px;
}

.mobile-nav-drawer.open {
  display: block;
}

.mobile-nav-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-bottom: 24px;
}

.mobile-nav-link {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-dark);
  display: block;
  padding: 8px 0;
}

/* =========================================================================
   02｜Hero 首屏
   ========================================================================= */
.hero-section {
  padding-top: 64px;
  padding-bottom: 80px;
  background: linear-gradient(180deg, #FFFFFF 0%, #F5F9FF 100%);
  border-bottom: 1px solid var(--color-border);
}

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

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

.hero-headline {
  font-size: 44px;
  font-weight: 800;
  color: var(--color-dark);
  line-height: 1.25;
  letter-spacing: -1px;
  margin-bottom: 20px;
}

.hero-headline .text-brand {
  color: var(--color-primary);
}

.hero-description {
  font-size: 18px;
  color: var(--color-text-secondary);
  line-height: 1.8;
  margin-bottom: 32px;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 36px;
  flex-wrap: wrap;
}

.hero-guarantee {
  display: flex;
  align-items: center;
  gap: 24px;
  padding-top: 24px;
  border-top: 1px solid var(--color-border);
  flex-wrap: wrap;
}

.guarantee-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--color-text-secondary);
  font-weight: 500;
}

.guarantee-item svg {
  color: var(--color-primary);
  width: 18px;
  height: 18px;
}

.hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-illustration {
  width: 100%;
  max-width: 500px;
  height: auto;
}

/* =========================================================================
   03｜服务核心优势 (4 宫格)
   ========================================================================= */
.advantages-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}

.advantage-card {
  background-color: #FFFFFF;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: all 0.25s ease;
  display: flex;
  flex-direction: column;
}

.advantage-card:hover {
  border-color: var(--color-border-hover);
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.advantage-icon-wrapper {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  background-color: var(--bg-cloud-blue);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}

.advantage-icon-wrapper svg {
  width: 26px;
  height: 26px;
}

.advantage-card-category {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 6px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.advantage-card-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-dark);
  margin-bottom: 12px;
}

.advantage-card-desc {
  font-size: 15px;
  color: var(--color-text-secondary);
  line-height: 1.8;
  margin-bottom: 20px;
  flex-grow: 1;
}

.advantage-card-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary);
}

.advantage-card-link:hover {
  text-decoration: underline;
}

/* =========================================================================
   04｜套餐价格与对比
   ========================================================================= */
.pricing-notice-box {
  background-color: #FFFFFF;
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-primary);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  margin-bottom: 40px;
}

.notice-box-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--color-dark);
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 6px;
}

.notice-box-desc {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

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

.pricing-card {
  background-color: #FFFFFF;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: 36px 28px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all 0.25s ease;
}

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

.pricing-card.popular {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
}

.card-ribbon {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-primary);
  color: #FFFFFF;
  font-size: 12px;
  font-weight: 700;
  padding: 4px 16px;
  border-radius: 9999px;
  letter-spacing: 0.5px;
}

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

.pricing-plan-name {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-dark);
  margin-bottom: 8px;
}

.pricing-plan-badge {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  color: var(--color-primary);
  background-color: var(--bg-cloud-blue);
  padding: 2px 10px;
  border-radius: 9999px;
  margin-bottom: 16px;
}

.pricing-price-wrap {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 2px;
  margin-bottom: 4px;
}

.price-currency {
  font-size: 20px;
  font-weight: 600;
  color: var(--color-dark);
}

.price-amount {
  font-size: 48px;
  font-weight: 800;
  color: var(--color-dark);
  line-height: 1;
}

.price-period {
  font-size: 15px;
  color: var(--color-text-secondary);
}

.price-range-tip {
  font-size: 13px;
  color: var(--color-text-secondary);
}

.pricing-specs-list {
  background-color: var(--bg-light-blue);
  border-radius: var(--radius-md);
  padding: 16px;
  margin-bottom: 24px;
  font-size: 14px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.spec-item {
  display: flex;
  justify-content: space-between;
}

.spec-label {
  color: var(--color-text-secondary);
}

.spec-val {
  font-weight: 600;
  color: var(--color-dark);
}

.pricing-features-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 32px;
  flex-grow: 1;
}

.feature-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 14px;
  color: var(--color-dark);
  line-height: 1.6;
}

.feature-icon {
  color: var(--color-primary);
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  margin-top: 2px;
}

/* 规格对比表格 */
.comparison-wrapper {
  background-color: #FFFFFF;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow-x: auto;
  padding: 24px;
}

.comparison-table-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-dark);
  margin-bottom: 16px;
  text-align: center;
}

.comparison-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  text-align: left;
}

.comparison-table th,
.comparison-table td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--color-border);
}

.comparison-table th {
  background-color: var(--bg-light-blue);
  color: var(--color-dark);
  font-weight: 700;
}

.comparison-table tr:hover td {
  background-color: #F8FAFD;
}

/* =========================================================================
   05｜应用场景
   ========================================================================= */
.scenarios-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.scenario-card {
  background-color: #FFFFFF;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px;
  display: flex;
  flex-direction: column;
  transition: all 0.2s ease;
}

.scenario-card:hover {
  border-color: var(--color-border-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.scenario-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.scenario-tag {
  font-size: 12px;
  font-weight: 600;
  color: var(--color-primary);
  background-color: var(--bg-cloud-blue);
  padding: 3px 10px;
  border-radius: 9999px;
}

.scenario-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-dark);
  margin-bottom: 12px;
}

.scenario-desc {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.8;
  margin-bottom: 20px;
  flex-grow: 1;
}

.scenario-meta {
  border-top: 1px solid var(--color-border);
  padding-top: 12px;
  font-size: 13px;
  color: var(--color-text-secondary);
}

.scenario-meta strong {
  color: var(--color-dark);
}

/* =========================================================================
   06｜知识文章中心
   ========================================================================= */
.articles-search-bar {
  max-width: 480px;
  margin: -24px auto 48px;
  display: flex;
  gap: 12px;
}

.search-input {
  width: 100%;
  padding: 12px 18px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: 15px;
  outline: none;
  background-color: #FFFFFF;
  transition: border-color 0.2s;
}

.search-input:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

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

.article-card {
  background-color: #FFFFFF;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px;
  display: flex;
  flex-direction: column;
  transition: all 0.25s ease;
}

.article-card:hover {
  border-color: var(--color-border-hover);
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.article-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
  font-size: 13px;
}

.article-category-badge {
  font-weight: 600;
  color: var(--color-primary);
  background-color: var(--bg-cloud-blue);
  padding: 3px 10px;
  border-radius: 9999px;
}

.article-read-time {
  color: var(--color-text-secondary);
}

.article-card-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-dark);
  line-height: 1.5;
  margin-bottom: 12px;
}

.article-card-title a {
  color: var(--color-dark);
}

.article-card-title a:hover {
  color: var(--color-primary);
}

.article-card-summary {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.8;
  margin-bottom: 20px;
  flex-grow: 1;
}

.article-card-footer {
  border-top: 1px solid var(--color-border);
  padding-top: 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.article-date {
  font-size: 13px;
  color: var(--color-text-secondary);
}

/* =========================================================================
   07｜流量需求测算计算器
   ========================================================================= */
.calculator-card {
  background-color: #FFFFFF;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: 40px;
  box-shadow: var(--shadow-sm);
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 48px;
  align-items: center;
}

.calc-controls {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.calc-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.calc-label-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 15px;
  font-weight: 600;
  color: var(--color-dark);
}

.calc-val-badge {
  color: var(--color-primary);
  font-weight: 700;
  font-size: 15px;
}

.calc-range {
  width: 100%;
  accent-color: var(--color-primary);
  height: 6px;
  cursor: pointer;
}

.calc-result-panel {
  background-color: var(--bg-light-blue);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  text-align: center;
}

.result-panel-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text-secondary);
  margin-bottom: 8px;
}

.result-big-number {
  font-size: 48px;
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1.1;
  margin-bottom: 4px;
}

.result-unit {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-dark);
}

.result-plan-recommendation {
  margin: 20px 0;
  padding: 12px;
  background-color: #FFFFFF;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: 14px;
}

.result-plan-name {
  color: var(--color-primary);
  font-weight: 700;
}

/* =========================================================================
   08｜用户真实评价模块 (Image 2 模式：深蓝背景 6 卡片网格)
   ========================================================================= */
.section-reviews-dark {
  background-color: #070F1E;
  border-top: 1px solid #16243A;
  border-bottom: 1px solid #16243A;
}

.section-badge-dark {
  background-color: rgba(37, 99, 235, 0.2);
  color: #60A5FA;
  border: 1px solid rgba(59, 130, 246, 0.3);
}

.text-white {
  color: #FFFFFF !important;
}

.text-slate {
  color: #94A3B8 !important;
}

.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.review-card {
  background-color: #0B1728;
  border: 1px solid #162842;
  border-radius: 12px;
  padding: 24px;
  display: flex;
  flex-direction: column;
  transition: all 0.25s ease;
}

.review-card:hover {
  border-color: #2563EB;
  transform: translateY(-3px);
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.45);
}

.review-user-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 14px;
}

.review-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  font-weight: 700;
  color: #FFFFFF;
  flex-shrink: 0;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.review-user-info {
  display: flex;
  flex-direction: column;
}

.review-user-name {
  font-size: 16px;
  font-weight: 700;
  color: #FFFFFF;
  line-height: 1.3;
}

.review-user-role {
  font-size: 12px;
  color: #94A3B8;
  margin-top: 3px;
}

.review-stars {
  color: #F59E0B;
  font-size: 15px;
  letter-spacing: 2px;
  margin-bottom: 14px;
}

.review-content {
  font-size: 14px;
  line-height: 1.75;
  color: #CBD5E1;
  margin-bottom: 20px;
  flex-grow: 1;
}

.review-verified-badge {
  display: inline-flex;
  align-items: center;
  align-self: flex-start;
  padding: 4px 10px;
  border-radius: 4px;
  font-size: 12px;
  font-weight: 500;
  background-color: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.35);
  color: #10B981;
}

/* =========================================================================
   09｜FAQ 问答手风琴
   ========================================================================= */
.faq-accordion {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.accordion-item {
  background-color: #FFFFFF;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color 0.2s;
}

.accordion-item:hover {
  border-color: var(--color-border-hover);
}

.accordion-header {
  width: 100%;
  padding: 20px 24px;
  background: transparent;
  border: none;
  text-align: left;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  font-size: 16px;
  font-weight: 600;
  color: var(--color-dark);
  gap: 16px;
}

.accordion-icon {
  width: 20px;
  height: 20px;
  color: var(--color-primary);
  flex-shrink: 0;
  transition: transform 0.25s ease;
}

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

.accordion-content {
  display: none;
  padding: 0 24px 20px;
  font-size: 15px;
  color: var(--color-text-secondary);
  line-height: 1.85;
}

.accordion-item.active .accordion-content {
  display: block;
}

/* =========================================================================
   10｜页脚 Footer
   ========================================================================= */
.site-footer {
  background-color: var(--bg-light-blue);
  border-top: 1px solid var(--color-border);
  padding-top: 64px;
  padding-bottom: 32px;
  margin-top: auto;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr 1.2fr 1fr;
  gap: 40px;
  margin-bottom: 48px;
}

.footer-brand-desc {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.8;
  margin-top: 16px;
  margin-bottom: 20px;
}

.footer-col-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--color-dark);
  margin-bottom: 20px;
}

.footer-links-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links-list a {
  font-size: 14px;
  color: var(--color-text-secondary);
  transition: color 0.2s;
}

.footer-links-list a:hover {
  color: var(--color-primary);
}

.footer-bottom {
  border-top: 1px solid var(--color-border);
  padding-top: 28px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
  color: var(--color-text-secondary);
  flex-wrap: wrap;
  gap: 16px;
}

/* =========================================================================
   文章独立页面专用样式 (Article Layout)
   ========================================================================= */
.reading-progress-bar {
  position: fixed;
  top: 72px;
  left: 0;
  height: 3px;
  background-color: var(--color-primary);
  width: 0%;
  z-index: 999;
  transition: width 0.1s linear;
}

.breadcrumbs-nav {
  padding: 16px 0;
  font-size: 14px;
  color: var(--color-text-secondary);
}

.breadcrumbs-list {
  display: flex;
  align-items: center;
  gap: 8px;
  list-style: none;
  flex-wrap: wrap;
}

.breadcrumbs-item a {
  color: var(--color-text-secondary);
}

.breadcrumbs-item a:hover {
  color: var(--color-primary);
}

.breadcrumbs-separator {
  color: #CBD5E1;
}

.article-header {
  padding-top: 32px;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 40px;
}

.article-meta-tags {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.article-h1 {
  font-size: 36px;
  font-weight: 800;
  color: var(--color-dark);
  line-height: 1.35;
  letter-spacing: -0.5px;
  margin-bottom: 20px;
}

.article-meta-info {
  display: flex;
  align-items: center;
  gap: 20px;
  font-size: 14px;
  color: var(--color-text-secondary);
  flex-wrap: wrap;
}

.article-layout {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  gap: 48px;
  margin-bottom: 64px;
}

.article-sidebar {
  position: sticky;
  top: 96px;
  align-self: start;
  max-height: calc(100vh - 120px);
  overflow-y: auto;
  padding-right: 12px;
}

.toc-card {
  background-color: var(--bg-light-blue);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
}

.toc-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--color-dark);
  margin-bottom: 12px;
}

.toc-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: 13px;
}

.toc-list a {
  color: var(--color-text-secondary);
  line-height: 1.5;
  display: block;
}

.toc-list a:hover {
  color: var(--color-primary);
}

.article-body-content {
  font-size: 17px;
  line-height: 1.9;
  color: #2D3748;
}

.article-intro-box {
  background-color: var(--bg-light-blue);
  border-left: 4px solid var(--color-primary);
  padding: 20px 24px;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin-bottom: 40px;
  font-size: 17px;
  color: var(--color-dark);
}

.article-body-content h2 {
  font-size: 24px;
  font-weight: 700;
  color: var(--color-dark);
  margin-top: 48px;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-border);
  scroll-margin-top: 96px;
}

.article-body-content h3 {
  font-size: 19px;
  font-weight: 600;
  color: var(--color-dark);
  margin-top: 28px;
  margin-bottom: 12px;
  scroll-margin-top: 96px;
}

.article-body-content p {
  margin-bottom: 20px;
}

.article-body-content ul,
.article-body-content ol {
  margin-bottom: 24px;
  padding-left: 24px;
}

.article-body-content li {
  margin-bottom: 8px;
}

.article-table-wrap {
  overflow-x: auto;
  margin: 28px 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.article-data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 15px;
  text-align: left;
}

.article-data-table th,
.article-data-table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--color-border);
}

.article-data-table th {
  background-color: var(--bg-light-blue);
  color: var(--color-dark);
  font-weight: 700;
}

.article-data-table tr:last-child td {
  border-bottom: none;
}

.article-note-box {
  background-color: #FEF3C7;
  border-left: 4px solid #F59E0B;
  padding: 16px 20px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: 15px;
  color: #92400E;
  margin: 32px 0;
}

.article-summary-box {
  background-color: var(--bg-cloud-blue);
  border: 1px solid #BFDBFE;
  border-radius: var(--radius-md);
  padding: 24px;
  margin-top: 40px;
  margin-bottom: 40px;
}

.summary-box-title {
  font-size: 17px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.article-related-section {
  border-top: 1px solid var(--color-border);
  padding-top: 48px;
  margin-top: 48px;
}

.article-cta-banner {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-interactive) 100%);
  color: #FFFFFF;
  border-radius: var(--radius-lg);
  padding: 36px;
  text-align: center;
  margin: 48px 0;
}

.article-cta-banner h3 {
  font-size: 22px;
  font-weight: 700;
  color: #FFFFFF;
  margin-bottom: 12px;
}

.article-cta-banner p {
  font-size: 16px;
  opacity: 0.95;
  margin-bottom: 24px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.article-cta-banner .btn {
  background-color: #FFFFFF;
  color: var(--color-primary) !important;
}

/* 模态框 Modal */
.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background-color: rgba(15, 23, 42, 0.6);
  z-index: 2000;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.modal-overlay.active {
  display: flex;
}

.modal-box {
  background-color: #FFFFFF;
  border-radius: var(--radius-lg);
  max-width: 520px;
  width: 100%;
  padding: 32px;
  box-shadow: var(--shadow-lg);
  position: relative;
}

.modal-close-btn {
  position: absolute;
  top: 16px;
  right: 16px;
  background: transparent;
  border: none;
  font-size: 20px;
  cursor: pointer;
  color: var(--color-text-secondary);
}

/* =========================================================================
   响应式断点适配 (360px, 390px, 768px, 1024px, 1440px)
   ========================================================================= */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 40px;
  }
  .hero-content {
    margin: 0 auto;
  }
  .hero-cta-group {
    justify-content: center;
  }
  .hero-guarantee {
    justify-content: center;
  }
  .pricing-grid {
    grid-template-columns: 1fr;
    max-width: 440px;
    margin-left: auto;
    margin-right: auto;
  }
  .scenarios-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .calculator-card {
    grid-template-columns: 1fr;
  }
  .reviews-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .article-layout {
    grid-template-columns: 1fr;
  }
  .article-sidebar {
    display: none;
  }
}

@media (max-width: 768px) {
  .nav-menu {
    display: none;
  }
  .mobile-toggle {
    display: block;
  }
  .advantages-grid {
    grid-template-columns: 1fr;
  }
  .scenarios-grid {
    grid-template-columns: 1fr;
  }
  .articles-grid {
    grid-template-columns: 1fr;
  }
  .reviews-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .hero-headline {
    font-size: 32px;
  }
  .section-title {
    font-size: 26px;
  }
  .article-h1 {
    font-size: 28px;
  }
}

@media (max-width: 390px) {
  .hero-headline {
    font-size: 28px;
  }
  .btn {
    width: 100%;
  }
  .hero-cta-group {
    flex-direction: column;
    width: 100%;
  }
}