/* ==========================================================================
   快雷GO 品牌官网视觉系统
   主题：巨幕品牌宣言 Massive Statement
   色彩：米白 (#FAF8F5)、纯黑 (#111111)、明亮钴蓝 (#0047AB / #1850E5)
   ========================================================================== */

:root {
  --color-bg: #FAF8F5;
  --color-surface: #FFFFFF;
  --color-surface-soft: #F4F0EA;
  --color-surface-dark: #111111;
  --color-text-main: #111111;
  --color-text-muted: #555555;
  --color-text-light: #888888;
  --color-text-inverse: #FAF8F5;
  --color-cobalt: #0047AB;
  --color-cobalt-bright: #1850E5;
  --color-cobalt-subtle: #EBF1FF;
  --color-border: #E5DFC5;
  --color-border-dark: #2A2A2A;
  --color-accent-amber: #D97706;
  --color-accent-green: #059669;
  
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  
  --container-max: 1240px;
  --container-wide: 1400px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;
  --shadow-subtle: 0 4px 20px rgba(0, 0, 0, 0.04);
  --shadow-hover: 0 12px 32px rgba(0, 71, 171, 0.08);
  --transition-normal: 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  font-family: var(--font-sans);
  background-color: var(--color-bg);
  color: var(--color-text-main);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

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

a {
  color: var(--color-cobalt);
  text-decoration: none;
  transition: color var(--transition-normal);
}

a:hover {
  color: var(--color-cobalt-bright);
}

a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible {
  outline: 2px solid var(--color-cobalt-bright);
  outline-offset: 3px;
}

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

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

.container-wide {
  width: 100%;
  max-width: var(--container-wide);
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

/* ==========================================================================
   导航头部
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(250, 248, 245, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.nav-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.45rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--color-surface-dark);
}

.brand-logo-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  background: var(--color-cobalt);
  color: #FFFFFF;
  font-weight: 900;
  font-size: 1.1rem;
  border-radius: var(--radius-sm);
}

.brand-tag {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-cobalt);
  background: var(--color-cobalt-subtle);
  padding: 2px 8px;
  border-radius: 999px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.nav-menu {
  display: flex;
  align-items: center;
  list-style: none;
  gap: 32px;
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-text-main);
  position: relative;
  padding: 6px 0;
}

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

.nav-link.active::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--color-cobalt);
}

.nav-cta-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 22px;
  background: var(--color-cobalt);
  color: #FFFFFF !important;
  font-size: 0.92rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-cobalt);
  transition: all var(--transition-normal);
  white-space: nowrap;
}

.nav-cta-btn:hover {
  background: var(--color-cobalt-bright);
  border-color: var(--color-cobalt-bright);
  transform: translateY(-1px);
  box-shadow: 0 4px 14px rgba(0, 71, 171, 0.25);
}

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  padding: 8px;
  color: var(--color-text-main);
}

/* ==========================================================================
   巨幕品牌宣言 (Hero Section)
   逐行排版、超大中文标题、局部蒙版对比、编辑式长页面风格
   ========================================================================== */
.hero-statement-section {
  padding: 80px 0 100px;
  position: relative;
  border-bottom: 1px solid var(--color-border);
  background: linear-gradient(180deg, rgba(235, 241, 255, 0.3) 0%, rgba(250, 248, 245, 1) 100%);
}

.hero-meta-bar {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 32px;
  flex-wrap: wrap;
}

.status-indicator {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--color-accent-green);
  background: rgba(5, 150, 105, 0.08);
  padding: 4px 12px;
  border-radius: 999px;
  border: 1px solid rgba(5, 150, 105, 0.2);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--color-accent-green);
  box-shadow: 0 0 0 3px rgba(5, 150, 105, 0.2);
}

.hero-statement-title {
  font-size: clamp(2.4rem, 6.2vw, 5.2rem);
  font-weight: 900;
  line-height: 1.12;
  letter-spacing: -0.035em;
  color: var(--color-surface-dark);
  margin-bottom: 36px;
  max-width: 1100px;
}

.hero-statement-title .line-primary {
  display: block;
  color: var(--color-surface-dark);
}

.hero-statement-title .line-accent {
  display: block;
  color: var(--color-cobalt);
  position: relative;
  background: linear-gradient(90deg, var(--color-cobalt) 0%, var(--color-cobalt-bright) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-statement-title .line-sub {
  display: block;
  font-size: 0.55em;
  font-weight: 700;
  color: #333333;
  margin-top: 8px;
  letter-spacing: -0.01em;
  -webkit-text-fill-color: initial;
}

.hero-statement-desc {
  font-size: 1.25rem;
  line-height: 1.8;
  color: #444444;
  max-width: 860px;
  margin-bottom: 44px;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 16px 36px;
  background: var(--color-cobalt);
  color: #FFFFFF !important;
  font-size: 1.05rem;
  font-weight: 700;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-cobalt);
  transition: all var(--transition-normal);
  box-shadow: 0 4px 16px rgba(0, 71, 171, 0.2);
}

.btn-primary:hover {
  background: var(--color-cobalt-bright);
  border-color: var(--color-cobalt-bright);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 71, 171, 0.28);
}

.btn-outline {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 16px 30px;
  background: var(--color-surface);
  color: var(--color-surface-dark);
  font-size: 1.05rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  transition: all var(--transition-normal);
}

.btn-outline:hover {
  border-color: var(--color-surface-dark);
  background: #FFFFFF;
  color: var(--color-surface-dark);
  transform: translateY(-1px);
}

.hero-guarantee-strip {
  margin-top: 56px;
  padding-top: 36px;
  border-top: 1px solid rgba(229, 223, 197, 0.8);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 28px;
}

.guarantee-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.guarantee-label {
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--color-cobalt);
  letter-spacing: 0.05em;
}

.guarantee-value {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-surface-dark);
}

/* ==========================================================================
   章节通用样式 (宽幅章节与编辑式排版)
   ========================================================================== */
.section-block {
  padding: 90px 0;
  position: relative;
}

.section-block.alt-bg {
  background-color: #FFFFFF;
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.section-block.dark-bg {
  background-color: var(--color-surface-dark);
  color: var(--color-text-inverse);
}

.section-header {
  margin-bottom: 56px;
}

.section-kicker {
  font-size: 0.85rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-cobalt);
  margin-bottom: 12px;
  display: block;
}

.section-title {
  font-size: clamp(1.8rem, 3.5vw, 2.8rem);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.02em;
  color: var(--color-surface-dark);
  margin-bottom: 16px;
}

.dark-bg .section-title {
  color: var(--color-text-inverse);
}

.section-subtitle {
  font-size: 1.1rem;
  color: var(--color-text-muted);
  max-width: 720px;
  line-height: 1.7;
}

.dark-bg .section-subtitle {
  color: #A0A0A0;
}

/* ==========================================================================
   工作学习场景 (非对称网格)
   ========================================================================== */
.scenarios-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.scenario-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 40px;
  position: relative;
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

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

.scenario-card-header {
  margin-bottom: 20px;
}

.scenario-tag {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--color-cobalt);
  background: var(--color-cobalt-subtle);
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  margin-bottom: 14px;
}

.scenario-title {
  font-size: 1.4rem;
  font-weight: 700;
  line-height: 1.35;
  color: var(--color-surface-dark);
  margin-bottom: 12px;
}

.scenario-desc {
  font-size: 0.98rem;
  line-height: 1.7;
  color: var(--color-text-muted);
  margin-bottom: 24px;
}

.scenario-link {
  font-size: 0.92rem;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--color-cobalt);
}

.scenario-link:hover {
  gap: 10px;
}

/* ==========================================================================
   实用计算工具：文件传输时间估算器
   ========================================================================== */
.calculator-box {
  background: var(--color-surface);
  border: 2px solid var(--color-surface-dark);
  border-radius: var(--radius-md);
  padding: 48px;
  box-shadow: 8px 8px 0px rgba(17, 17, 17, 0.08);
}

.calculator-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
}

.calc-form-group {
  margin-bottom: 24px;
}

.calc-label {
  display: block;
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--color-surface-dark);
  margin-bottom: 8px;
}

.calc-input-row {
  display: flex;
  gap: 10px;
}

.calc-input {
  flex: 1;
  padding: 12px 16px;
  font-size: 1.05rem;
  font-family: var(--font-mono);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-bg);
  color: var(--color-surface-dark);
  transition: border-color var(--transition-normal);
}

.calc-input:focus {
  border-color: var(--color-cobalt);
  background: #FFFFFF;
}

.calc-select {
  width: 110px;
  padding: 12px 14px;
  font-size: 0.95rem;
  font-weight: 600;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-bg);
  color: var(--color-surface-dark);
  cursor: pointer;
}

.calc-btn-group {
  display: flex;
  gap: 12px;
  margin-top: 16px;
}

.calc-btn-primary {
  flex: 1;
  padding: 14px 20px;
  background: var(--color-cobalt);
  color: #FFFFFF;
  border: none;
  font-size: 1rem;
  font-weight: 700;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background var(--transition-normal);
}

.calc-btn-primary:hover {
  background: var(--color-cobalt-bright);
}

.calc-btn-reset {
  padding: 14px 20px;
  background: var(--color-surface-soft);
  color: var(--color-text-main);
  border: 1px solid var(--color-border);
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  cursor: pointer;
}

.calc-result-panel {
  background: var(--color-surface-soft);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 32px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.calc-result-header {
  margin-bottom: 20px;
}

.calc-result-label {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-cobalt);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 6px;
}

.calc-result-value {
  font-size: 2.2rem;
  font-weight: 900;
  color: var(--color-surface-dark);
  font-family: var(--font-mono);
  line-height: 1.2;
}

.calc-result-subrange {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin-top: 6px;
}

.calc-math-breakdown {
  margin-top: 20px;
  padding: 16px;
  background: #FFFFFF;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-family: var(--font-mono);
  color: #333333;
  line-height: 1.6;
}

.calc-disclaimer {
  margin-top: 20px;
  font-size: 0.82rem;
  line-height: 1.6;
  color: #666666;
  border-top: 1px dashed var(--color-border);
  padding-top: 14px;
}

/* ==========================================================================
   专题文章专区 (Insights Cards)
   ========================================================================== */
.articles-editorial-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.article-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 32px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all var(--transition-normal);
}

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

.article-card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.82rem;
  color: var(--color-text-light);
  margin-bottom: 16px;
}

.article-card-category {
  font-weight: 700;
  color: var(--color-cobalt);
}

.article-card-title {
  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--color-surface-dark);
  margin-bottom: 14px;
}

.article-card-desc {
  font-size: 0.92rem;
  color: var(--color-text-muted);
  line-height: 1.65;
  margin-bottom: 24px;
  flex-grow: 1;
}

.article-asset-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.78rem;
  color: #444444;
  background: var(--color-surface-soft);
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  margin-bottom: 20px;
  border: 1px solid rgba(229, 223, 197, 0.6);
}

.article-card-link {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--color-cobalt);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.article-card-link:hover {
  gap: 10px;
}

/* ==========================================================================
   套餐说明 (Plans Grid & Detail)
   集中管理数据、价格来源披露、核验状态、限制说明
   ========================================================================== */
.plans-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.plan-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 32px 24px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all var(--transition-normal);
}

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

.plan-card.featured {
  border: 2px solid var(--color-cobalt);
  background: #FFFFFF;
}

.plan-badge {
  position: absolute;
  top: -12px;
  right: 20px;
  background: var(--color-cobalt);
  color: #FFFFFF;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 999px;
  letter-spacing: 0.04em;
}

.plan-header {
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 20px;
  margin-bottom: 20px;
}

.plan-name {
  font-size: 1.45rem;
  font-weight: 800;
  color: var(--color-surface-dark);
  margin-bottom: 8px;
}

.plan-price-wrap {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 8px;
}

.plan-currency {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--color-cobalt);
}

.plan-price-number {
  font-size: 2.5rem;
  font-weight: 900;
  color: var(--color-surface-dark);
  line-height: 1;
  font-family: var(--font-mono);
}

.plan-period {
  font-size: 0.88rem;
  color: var(--color-text-light);
  font-weight: 500;
}

.plan-key-metric {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 12px;
  background: var(--color-surface-soft);
  border-radius: var(--radius-sm);
  margin-top: 12px;
}

.plan-metric-data {
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--color-cobalt);
}

.plan-metric-bandwidth {
  font-size: 0.82rem;
  color: #555555;
  font-weight: 600;
}

.plan-features-list {
  list-style: none;
  margin-bottom: 24px;
  flex-grow: 1;
}

.plan-feature-item {
  font-size: 0.88rem;
  line-height: 1.6;
  color: var(--color-text-main);
  padding: 6px 0;
  display: flex;
  align-items: flex-start;
  gap: 8px;
}

.plan-feature-item::before {
  content: "✓";
  color: var(--color-cobalt);
  font-weight: 800;
  font-size: 0.95rem;
}

.plan-limitations {
  border-top: 1px dashed var(--color-border);
  padding-top: 14px;
  margin-bottom: 20px;
}

.plan-limits-title {
  font-size: 0.78rem;
  font-weight: 700;
  color: #777777;
  text-transform: uppercase;
  margin-bottom: 6px;
}

.plan-limit-text {
  font-size: 0.8rem;
  color: #777777;
  line-height: 1.5;
}

.plan-cta-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 14px 18px;
  background: var(--color-cobalt);
  color: #FFFFFF !important;
  font-size: 0.95rem;
  font-weight: 700;
  border-radius: var(--radius-sm);
  text-align: center;
  transition: all var(--transition-normal);
  border: 1px solid var(--color-cobalt);
}

.plan-cta-btn:hover {
  background: var(--color-cobalt-bright);
  border-color: var(--color-cobalt-bright);
  box-shadow: 0 4px 12px rgba(0, 71, 171, 0.25);
}

.plans-disclosure-note {
  margin-top: 36px;
  padding: 20px 24px;
  background: var(--color-surface-soft);
  border-left: 4px solid var(--color-cobalt);
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  color: var(--color-text-muted);
  line-height: 1.7;
}

/* ==========================================================================
   用户评价模块 (声明“暂无已核验的公开评价”)
   ========================================================================== */
.reviews-section {
  padding: 70px 0;
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  background: #FFFFFF;
}

.reviews-empty-state {
  max-width: 680px;
  margin: 0 auto;
  text-align: center;
  padding: 48px 32px;
  background: var(--color-bg);
  border: 1px dashed var(--color-border);
  border-radius: var(--radius-md);
}

.reviews-empty-icon {
  font-size: 2rem;
  color: var(--color-text-light);
  margin-bottom: 16px;
}

.reviews-empty-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-surface-dark);
  margin-bottom: 8px;
}

.reviews-empty-desc {
  font-size: 0.92rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* ==========================================================================
   FAQ 折叠交互组件 (支持键盘操作)
   ========================================================================== */
.faq-accordion-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  max-width: 900px;
  margin: 0 auto;
}

.faq-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  transition: border-color var(--transition-normal);
}

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

.faq-question-btn {
  width: 100%;
  padding: 22px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  background: none;
  border: none;
  text-align: left;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-surface-dark);
  cursor: pointer;
  font-family: inherit;
}

.faq-icon-cross {
  font-size: 1.4rem;
  font-weight: 400;
  color: var(--color-cobalt);
  transition: transform var(--transition-normal);
  line-height: 1;
}

.faq-item.active .faq-icon-cross {
  transform: rotate(45deg);
}

.faq-answer-panel {
  padding: 0 28px 24px;
  font-size: 0.98rem;
  line-height: 1.8;
  color: #444444;
  white-space: pre-line;
}

.faq-item:not(.active) .faq-answer-panel {
  display: none;
}

/* ==========================================================================
   正文排版（文章页与详情页）
   ========================================================================== */
.article-header {
  padding: 60px 0 40px;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 48px;
}

.breadcrumb-nav {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  color: var(--color-text-light);
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.breadcrumb-separator {
  color: var(--color-border);
}

.article-main-title {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 900;
  line-height: 1.25;
  color: var(--color-surface-dark);
  letter-spacing: -0.02em;
  margin-bottom: 20px;
}

.article-meta-row {
  display: flex;
  align-items: center;
  gap: 20px;
  font-size: 0.9rem;
  color: var(--color-text-muted);
  flex-wrap: wrap;
}

.article-body {
  max-width: 860px;
  margin: 0 auto;
  font-size: 1.08rem;
  line-height: 1.85;
  color: #222222;
}

.article-body h2 {
  font-size: 1.75rem;
  font-weight: 800;
  margin-top: 52px;
  margin-bottom: 20px;
  color: var(--color-surface-dark);
  letter-spacing: -0.01em;
}

.article-body h3 {
  font-size: 1.35rem;
  font-weight: 700;
  margin-top: 36px;
  margin-bottom: 16px;
  color: var(--color-surface-dark);
}

.article-body h4 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-top: 24px;
  margin-bottom: 12px;
  color: var(--color-cobalt);
}

.article-body p {
  margin-bottom: 22px;
}

.article-body ul, .article-body ol {
  margin-bottom: 24px;
  padding-left: 28px;
}

.article-body li {
  margin-bottom: 10px;
}

.article-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 32px 0;
  font-size: 0.95rem;
  background: #FFFFFF;
  border-radius: var(--radius-sm);
  overflow: hidden;
  border: 1px solid var(--color-border);
}

.article-body th {
  background: var(--color-surface-soft);
  padding: 14px 18px;
  text-align: left;
  font-weight: 700;
  color: var(--color-surface-dark);
  border-bottom: 2px solid var(--color-border);
}

.article-body td {
  padding: 14px 18px;
  border-bottom: 1px solid var(--color-border);
  color: #333333;
}

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

.article-body pre {
  background: var(--color-surface-dark);
  color: #E2E8F0;
  padding: 20px 24px;
  border-radius: var(--radius-sm);
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  line-height: 1.6;
  margin: 28px 0;
}

.article-body code:not(pre code) {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: var(--color-surface-soft);
  color: var(--color-cobalt);
  padding: 2px 6px;
  border-radius: 4px;
  border: 1px solid rgba(229, 223, 197, 0.6);
}

.article-footer-cta {
  margin-top: 60px;
  padding: 36px;
  background: var(--color-cobalt-subtle);
  border: 1px solid rgba(0, 71, 171, 0.2);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}

.article-related-section {
  margin-top: 70px;
  padding-top: 48px;
  border-top: 1px solid var(--color-border);
}

/* ==========================================================================
   页脚 (Footer)
   严格遵守品牌真实身份，不编造历史/注册地址，清晰展示统一入口
   ========================================================================== */
.site-footer {
  margin-top: auto;
  background: var(--color-surface-dark);
  color: var(--color-text-inverse);
  padding: 70px 0 36px;
  border-top: 1px solid var(--color-border-dark);
}

.footer-top-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 48px;
  margin-bottom: 56px;
}

.footer-brand-title {
  font-size: 1.5rem;
  font-weight: 800;
  color: #FFFFFF;
  margin-bottom: 14px;
}

.footer-brand-desc {
  font-size: 0.9rem;
  color: #999999;
  line-height: 1.7;
  max-width: 380px;
  margin-bottom: 20px;
}

.footer-heading {
  font-size: 0.95rem;
  font-weight: 700;
  color: #FFFFFF;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 20px;
}

.footer-links-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-link {
  font-size: 0.9rem;
  color: #A0A0A0;
  transition: color var(--transition-normal);
}

.footer-link:hover {
  color: #FFFFFF;
}

.footer-bottom-bar {
  padding-top: 32px;
  border-top: 1px solid var(--color-border-dark);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.82rem;
  color: #777777;
  flex-wrap: wrap;
  gap: 16px;
}

/* ==========================================================================
   响应式调整
   ========================================================================== */
@media (max-width: 1080px) {
  .plans-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .articles-editorial-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-top-grid {
    grid-template-columns: 1fr 1fr;
    gap: 36px;
  }
}

@media (max-width: 768px) {
  .nav-menu {
    display: none;
  }
  .mobile-menu-btn {
    display: block;
  }
  .hero-statement-section {
    padding: 48px 0 60px;
  }
  .hero-statement-title {
    font-size: 2.2rem;
  }
  .scenarios-grid {
    grid-template-columns: 1fr;
  }
  .calculator-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .calculator-box {
    padding: 24px;
  }
  .articles-editorial-grid {
    grid-template-columns: 1fr;
  }
  .plans-grid {
    grid-template-columns: 1fr;
  }
  .footer-top-grid {
    grid-template-columns: 1fr;
  }
  .article-footer-cta {
    flex-direction: column;
    align-items: flex-start;
  }
}