/* ==========================================================================
   【风格 03 · 极简信标】狗狗加速 GouGouJiaSu (DOGO) - 瑞士极简工程风样式库
   基准调色板：暖纸白 #F4F2EC | 国际橙 #FF4D00 | 炭黑 #1A1A1A
   零依赖 | 纯原生 CSS | 秒开级性能 | 响应式媒体查询
   ========================================================================== */

:root {
  --color-paper: #F4F2EC;
  --color-orange: #FF4D00;
  --color-dark: #1A1A1A;
  --color-dim: #737373;
  --color-border: rgba(26, 26, 26, 0.12);
  --color-border-hover: rgba(26, 26, 26, 0.35);
  --color-grid: rgba(26, 26, 26, 0.055);

  --bg-card: rgba(255, 255, 255, 0.72);
  --bg-card-hover: #ffffff;

  --font-heading: "Noto Sans SC", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;

  --shadow-sm: 0 2px 8px rgba(26, 26, 26, 0.04);
  --shadow-md: 0 10px 30px rgba(26, 26, 26, 0.06);
  --shadow-orange: 0 6px 20px rgba(255, 77, 0, 0.28);
  --shadow-orange-lg: 0 10px 28px rgba(255, 77, 0, 0.38);

  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --radius-full: 9999px;

  --transition: all 0.22s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  font-family: var(--font-heading);
  background-color: var(--color-paper);
  color: var(--color-dark);
  line-height: 1.6;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
  background-color: var(--color-paper);
}

/* 键盘可访问性：无障碍跳过导航链接 */
.skip-link {
  position: absolute;
  top: -120px;
  left: 24px;
  background-color: var(--color-orange);
  color: #ffffff !important;
  padding: 12px 20px;
  font-family: var(--font-heading);
  font-size: 0.92rem;
  font-weight: 700;
  border-radius: var(--radius-sm);
  z-index: 9999;
  text-decoration: none;
  box-shadow: 0 4px 16px rgba(255, 77, 0, 0.4);
  transition: top 0.2s ease;
}

.skip-link:focus,
.skip-link:focus-visible {
  top: 16px;
  outline: 3px solid var(--color-dark);
  outline-offset: 2px;
}

/* 键盘焦点样式 */
:focus-visible {
  outline: 2px solid var(--color-orange);
  outline-offset: 3px;
}

/* 固定页眉不遮挡锚点目标 */
section[id],
div[id],
article[id],
[id] {
  scroll-margin-top: 84px;
}

/* 遵循系统的减弱动画偏好 (Accessibility & Reduced Motion) */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  #beacon-canvas {
    display: none !important;
  }
}

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

img, svg {
  vertical-align: middle;
}

/* 全屏 Canvas 背景 (fixed 定位) */
#beacon-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 0;
  pointer-events: none;
}

/* 页面主体内容容器层 */
.page-wrapper {
  position: relative;
  z-index: 1;
  width: 100%;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 28px;
  padding-right: 28px;
}

/* ==========================================================================
   顶部工程导航栏 (Site Header)
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(244, 242, 236, 0.82);
  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: 68px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--color-dark);
}

.brand-crosshair {
  color: var(--color-orange);
  font-size: 1.2rem;
  font-weight: 900;
  line-height: 1;
}

.brand-name-cn {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 1.12rem;
  color: var(--color-dark);
  letter-spacing: -0.02em;
}

.brand-name-en {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--color-dim);
  font-weight: 600;
  letter-spacing: 0.08em;
  border-left: 1px solid var(--color-border);
  padding-left: 8px;
  margin-left: 4px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
  list-style: none;
}

.nav-link {
  font-size: 0.88rem;
  font-weight: 600;
  color: #4a4a4a;
  letter-spacing: -0.01em;
  padding: 6px 4px;
  position: relative;
}

.nav-link:hover {
  color: var(--color-orange);
}

.nav-link.nav-kb-link {
  color: var(--color-orange);
  font-weight: 700;
  border-bottom: 2px solid var(--color-orange);
}

/* 按钮规范 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--font-heading);
  font-size: 0.92rem;
  font-weight: 700;
  padding: 11px 24px;
  border-radius: var(--radius-sm);
  transition: var(--transition);
  cursor: pointer;
  letter-spacing: -0.01em;
  white-space: nowrap;
}

.btn-solid-orange,
.btn-primary {
  background-color: var(--color-orange);
  color: #ffffff;
  border: 1px solid var(--color-orange);
  box-shadow: var(--shadow-orange);
}

.btn-solid-orange:hover,
.btn-primary:hover {
  background-color: #e04400;
  border-color: #e04400;
  transform: translateY(-2px);
  box-shadow: var(--shadow-orange-lg);
}

.btn-outline-dark,
.btn-secondary {
  background-color: transparent;
  color: var(--color-dark);
  border: 1px solid var(--color-dark);
}

.btn-outline-dark:hover,
.btn-secondary:hover {
  background-color: var(--color-dark);
  color: #ffffff;
  transform: translateY(-2px);
}

.btn-lg {
  padding: 14px 32px;
  font-size: 1rem;
}

/* ==========================================================================
   首屏主视觉区 (Hero Section) · 瑞士极简工程风固定两栏
   ========================================================================== */
.hero-section {
  padding: 64px 0 72px;
  position: relative;
  border-bottom: 1px solid var(--color-border);
}

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

/* 左栏：自上而下严格按要求排布 */
.hero-col-left {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

/* 1. eyebrow 小字 */
.eyebrow-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--color-dim);
  text-transform: uppercase;
  margin-bottom: 24px;
  padding: 5px 12px;
  border: 1px solid var(--color-border);
  background: rgba(255, 255, 255, 0.45);
  border-radius: var(--radius-sm);
}

.eyebrow-tag .badge-plus {
  color: var(--color-orange);
  font-weight: 900;
}

/* 2. 大标题 + 行内 9s 匀速旋转徽章 + 脉冲橙点 */
.hero-headline {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 8px;
  margin-bottom: 24px;
}

.hero-brand-title {
  display: block;
  font-size: clamp(2.2rem, 4.4vw, 3.5rem);
  font-weight: 900;
  line-height: 1.12;
  letter-spacing: -0.04em;
  color: var(--color-dark);
}

.hero-slogan-title {
  display: inline-flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  font-size: clamp(1.85rem, 3.8vw, 3rem);
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -0.03em;
  color: var(--color-dark);
}

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

/* 行内动效徽章：橙色圆角方框以 9s 匀速旋转，中心一颗脉冲缩放的橙点 */
.inline-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border: 2px solid var(--color-orange);
  border-radius: 6px;
  vertical-align: middle;
  animation: rotateBadge 9s linear infinite;
  transform-origin: center center;
  position: relative;
  flex-shrink: 0;
  background: rgba(255, 77, 0, 0.05);
}

.inline-badge-dot {
  width: 8px;
  height: 8px;
  background-color: var(--color-orange);
  border-radius: 50%;
  animation: pulseDot 1.8s ease-in-out infinite;
}

@keyframes rotateBadge {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

@keyframes pulseDot {
  0%, 100% { transform: scale(0.75); opacity: 0.6; }
  50% { transform: scale(1.35); opacity: 1; }
}

/* 3. 副标题 */
.hero-subtitle {
  font-size: 1.08rem;
  line-height: 1.72;
  color: #3f3f3f;
  max-width: 620px;
  margin-bottom: 38px;
  letter-spacing: -0.01em;
}

/* 4. 按钮两枚 */
.hero-actions {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}

/* 5. 三列数据 */
.hero-metrics-bar {
  width: 100%;
  max-width: 620px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  padding-top: 28px;
  border-top: 1px solid var(--color-border);
}

.metric-col {
  display: flex;
  flex-direction: column;
}

.metric-value {
  font-family: var(--font-mono);
  font-size: 1.85rem;
  font-weight: 700;
  color: var(--color-dark);
  line-height: 1.1;
  margin-bottom: 4px;
  letter-spacing: -0.03em;
}

.metric-label {
  font-size: 0.82rem;
  color: var(--color-dim);
  font-weight: 600;
}

.metric-coord-tag {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: rgba(26, 26, 26, 0.35);
  margin-top: 3px;
}

/* 右栏：极简几何信标犬 SVG 主视觉 */
.hero-col-right {
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  width: 100%;
}

.svg-beacon-wrapper {
  width: 100%;
  max-width: 480px;
  aspect-ratio: 1 / 1;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.svg-beacon-dog {
  width: 100%;
  height: 100%;
  overflow: visible;
}

/* SVG 动画清单样式定义 */
/* ④ 外圈虚线仪表环 40s 缓慢旋转 */
.rotate-ring-40s {
  transform-origin: 260px 260px;
  animation: rotateGauge 40s linear infinite;
}

@keyframes rotateGauge {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

/* ⑤ 两枚小十字标记呼吸闪烁 */
.cross-breathe {
  animation: crossFade 3.2s ease-in-out infinite;
}

.cross-breathe-delay {
  animation: crossFade 3.2s ease-in-out infinite;
  animation-delay: 1.6s;
}

@keyframes crossFade {
  0%, 100% { opacity: 0.2; transform: scale(0.9); }
  50% { opacity: 1; transform: scale(1.1); }
}

/* ==========================================================================
   通用章节头部样式 (Section Header)
   ========================================================================== */
.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 52px;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-orange);
  background: rgba(255, 77, 0, 0.08);
  border: 1px solid rgba(255, 77, 0, 0.2);
  padding: 4px 12px;
  border-radius: var(--radius-sm);
  margin-bottom: 14px;
}

.section-title {
  font-size: 2.15rem;
  font-weight: 900;
  letter-spacing: -0.03em;
  color: var(--color-dark);
  margin-bottom: 14px;
}

.section-desc {
  font-size: 1rem;
  color: #555555;
  line-height: 1.65;
}

/* ==========================================================================
   核心优势板块 (3个图文卡片)
   ========================================================================== */
.advantages-section {
  padding: 80px 0;
  border-bottom: 1px solid var(--color-border);
}

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

.adv-card {
  background: var(--bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 34px 28px;
  transition: var(--transition);
  position: relative;
  display: flex;
  flex-direction: column;
  backdrop-filter: blur(8px);
}

.adv-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--color-dark);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.adv-icon-wrap {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-sm);
  background: rgba(26, 26, 26, 0.05);
  border: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-orange);
  margin-bottom: 22px;
}

.adv-title {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--color-dark);
  margin-bottom: 10px;
  letter-spacing: -0.02em;
}

.adv-desc {
  font-size: 0.92rem;
  color: #555555;
  line-height: 1.68;
  margin-bottom: 22px;
  flex-grow: 1;
}

.adv-feature-list {
  list-style: none;
  border-top: 1px solid var(--color-border);
  padding-top: 16px;
}

.adv-feature-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.86rem;
  color: #4a4a4a;
  margin-bottom: 10px;
}

.adv-feature-list li:last-child {
  margin-bottom: 0;
}

.check-dot {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: rgba(255, 77, 0, 0.12);
  color: var(--color-orange);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  font-weight: 900;
  flex-shrink: 0;
}

/* ==========================================================================
   流媒体与 AI 支持图卡
   ========================================================================== */
.support-section {
  padding: 80px 0;
  border-bottom: 1px solid var(--color-border);
}

.support-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}

.support-card {
  background: var(--bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 34px;
  transition: var(--transition);
  backdrop-filter: blur(8px);
}

.support-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--color-dark);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.support-card-head {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 16px;
}

.support-card-icon {
  width: 46px;
  height: 46px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 77, 0, 0.1);
  color: var(--color-orange);
  border: 1px solid rgba(255, 77, 0, 0.2);
}

.support-card-title {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--color-dark);
}

.support-card-desc {
  font-size: 0.92rem;
  color: #555555;
  margin-bottom: 24px;
  line-height: 1.65;
}

.tags-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.brand-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(26, 26, 26, 0.04);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 7px 12px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--color-dark);
  transition: var(--transition);
}

.brand-badge:hover {
  border-color: var(--color-orange);
  color: var(--color-orange);
}

.brand-badge-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--color-orange);
}

/* ==========================================================================
   套餐价格对比表 (Pricing)
   ========================================================================== */
.pricing-section {
  padding: 80px 0;
  border-bottom: 1px solid var(--color-border);
}

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

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 38px 30px;
  position: relative;
  display: flex;
  flex-direction: column;
  transition: var(--transition);
  backdrop-filter: blur(8px);
}

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

.pricing-card.featured {
  border: 2px solid var(--color-orange);
  background: #ffffff;
  box-shadow: 0 8px 30px rgba(255, 77, 0, 0.12);
}

.popular-ribbon {
  position: absolute;
  top: -13px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-orange);
  color: #fff;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  padding: 4px 14px;
  border-radius: var(--radius-sm);
  white-space: nowrap;
}

.plan-name {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--color-dark);
  margin-bottom: 6px;
}

.plan-tagline {
  font-size: 0.85rem;
  color: var(--color-dim);
  margin-bottom: 22px;
}

.plan-price-wrap {
  display: flex;
  align-items: baseline;
  gap: 6px;
  margin-bottom: 24px;
  padding-bottom: 22px;
  border-bottom: 1px solid var(--color-border);
}

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

.price-number {
  font-size: 2.8rem;
  font-weight: 900;
  line-height: 1;
  color: var(--color-dark);
  font-family: var(--font-mono);
  letter-spacing: -0.04em;
}

.price-period {
  font-size: 0.82rem;
  color: var(--color-dim);
}

.plan-features {
  list-style: none;
  margin-bottom: 30px;
  flex-grow: 1;
}

.plan-features li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.88rem;
  color: #444444;
  margin-bottom: 12px;
}

.plan-features li svg {
  color: var(--color-orange);
  flex-shrink: 0;
}

/* ==========================================================================
   用户评价板块 (Reviews)
   ========================================================================== */
.reviews-section {
  padding: 80px 0;
  border-bottom: 1px solid var(--color-border);
}

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

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 32px 28px;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  backdrop-filter: blur(8px);
}

.review-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--color-dark);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.review-stars {
  color: var(--color-orange);
  font-size: 1.05rem;
  margin-bottom: 14px;
  letter-spacing: 2px;
}

.review-comment {
  font-size: 0.92rem;
  color: #444444;
  line-height: 1.7;
  margin-bottom: 22px;
  flex-grow: 1;
}

.review-author {
  display: flex;
  align-items: center;
  gap: 12px;
  border-top: 1px solid var(--color-border);
  padding-top: 16px;
}

.author-avatar {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-sm);
  background: rgba(26, 26, 26, 0.08);
  color: var(--color-dark);
  font-family: var(--font-mono);
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}

.author-info h3,
.author-info h4 {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--color-dark);
}

.author-info p {
  font-size: 0.78rem;
  color: var(--color-dim);
}

/* ==========================================================================
   常见问题 (FAQ)
   ========================================================================== */
.faq-section {
  padding: 80px 0;
  border-bottom: 1px solid var(--color-border);
}

.faq-list {
  max-width: 820px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  overflow: hidden;
  transition: var(--transition);
}

.faq-item[open] {
  border-color: var(--color-dark);
  background: #ffffff;
}

.faq-summary {
  padding: 18px 22px;
  font-size: 0.98rem;
  font-weight: 700;
  color: var(--color-dark);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
  list-style: none;
}

.faq-summary::-webkit-details-marker {
  display: none;
}

.faq-arrow {
  width: 18px;
  height: 18px;
  color: var(--color-dim);
  transition: transform 0.25s ease;
  flex-shrink: 0;
}

.faq-item[open] .faq-arrow {
  transform: rotate(180deg);
  color: var(--color-orange);
}

.faq-content {
  padding: 0 22px 20px;
  font-size: 0.92rem;
  color: #555555;
  line-height: 1.72;
  border-top: 1px solid rgba(26, 26, 26, 0.06);
  padding-top: 14px;
}

/* 内链导流卡片 */
.related-links-box {
  background: var(--bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 24px;
  backdrop-filter: blur(8px);
}

.related-links-title {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--color-dark);
  margin-bottom: 16px;
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 10px;
}

.related-links-title svg {
  color: var(--color-orange);
}

.related-links-list {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.related-link-item a {
  font-size: 0.88rem;
  color: #4a4a4a;
  display: inline-block;
  transition: var(--transition);
}

.related-link-item a:hover {
  color: var(--color-orange);
  transform: translateX(3px);
}

/* ==========================================================================
   底部行动号召 (CTA Banner)
   ========================================================================== */
.bottom-cta-banner {
  margin: 72px 0 60px;
  background: #ffffff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 56px 36px;
  text-align: center;
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
}

.bottom-cta-banner::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--color-orange);
}

.cta-banner-title {
  font-size: 2.1rem;
  font-weight: 900;
  color: var(--color-dark);
  letter-spacing: -0.03em;
  margin-bottom: 14px;
}

.cta-banner-desc {
  font-size: 1.02rem;
  color: #555555;
  margin-bottom: 32px;
  max-width: 580px;
  margin-left: auto;
  margin-right: auto;
}

/* ==========================================================================
   页脚 (Site Footer · 严格保留4个标题)
   ========================================================================== */
.site-footer {
  border-top: 1px solid var(--color-border);
  background: rgba(244, 242, 236, 0.85);
  backdrop-filter: blur(12px);
  padding: 36px 0 40px;
}

.footer-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 36px;
  margin-bottom: 20px;
}

.footer-nav-link {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--color-dark);
  transition: var(--transition);
}

.footer-nav-link:hover {
  color: var(--color-orange);
}

.footer-copy {
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--color-dim);
  letter-spacing: 0.02em;
}

/* ==========================================================================
   响应式媒体查询 (@media) · 手机端完美单栏自适应
   ========================================================================== */
@media (max-width: 1024px) {
  .hero-grid-beacon {
    grid-template-columns: 1fr;
    gap: 48px;
  }

  .advantages-grid,
  .pricing-grid,
  .reviews-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .support-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .container {
    padding-left: 18px;
    padding-right: 18px;
  }

  .nav-wrapper {
    height: 60px;
  }

  .nav-links {
    display: none; /* 移动端精简顶部导航，聚焦 CTA */
  }

  .hero-section {
    padding: 40px 0 48px;
  }

  .hero-headline {
    font-size: 2.2rem;
  }

  .hero-metrics-bar {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .advantages-grid,
  .pricing-grid,
  .reviews-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .related-links-list {
    grid-template-columns: 1fr;
  }

  .footer-nav {
    flex-wrap: wrap;
    gap: 20px;
  }

  .btn {
    width: 100%;
  }

  .hero-actions {
    width: 100%;
    flex-direction: column;
  }
}

/* ==========================================================================
   知识科普 3×3 九宫格与 SEO 文章页样式 (Swiss Minimalist Engineering)
   ========================================================================== */
.subpage-hero {
  padding: 60px 0 40px;
  text-align: center;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 48px;
}

.subpage-title {
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 900;
  color: var(--color-dark);
  letter-spacing: -0.03em;
  margin-bottom: 14px;
}

.subpage-subtitle {
  font-size: 1rem;
  color: #555555;
  max-width: 720px;
  margin: 0 auto;
  line-height: 1.65;
}

.subpage-content {
  padding-bottom: 80px;
}

/* 3x3 九宫格 */
.kb-grid-3x3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.kb-card {
  background: var(--bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  transition: var(--transition);
  text-decoration: none;
  color: inherit;
  backdrop-filter: blur(8px);
}

.kb-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--color-dark);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.kb-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.kb-card-num {
  font-family: var(--font-mono);
  font-size: 0.88rem;
  font-weight: 800;
  color: var(--color-orange);
}

.word-badge {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--color-dim);
  background: rgba(26, 26, 26, 0.05);
  border: 1px solid var(--color-border);
  padding: 3px 8px;
  border-radius: var(--radius-sm);
}

.kb-card-title {
  font-size: 1.12rem;
  font-weight: 800;
  line-height: 1.4;
  color: var(--color-dark);
  margin-bottom: 12px;
  letter-spacing: -0.02em;
}

.kb-card-excerpt {
  font-size: 0.88rem;
  color: #555555;
  line-height: 1.65;
  margin-bottom: 20px;
  flex-grow: 1;
}

.kb-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--color-border);
  padding-top: 14px;
}

.kb-card-btn {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--color-orange);
}

/* SEO 文章正文页 */
.article-container {
  max-width: 860px;
  margin: 0 auto;
  padding: 50px 24px 80px;
}

.article-header {
  margin-bottom: 40px;
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 30px;
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-dim);
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.article-title {
  font-size: clamp(1.8rem, 3.5vw, 2.5rem);
  font-weight: 900;
  color: var(--color-dark);
  line-height: 1.25;
  letter-spacing: -0.03em;
  margin-bottom: 18px;
}

.article-lead {
  font-size: 1.05rem;
  color: #444444;
  line-height: 1.7;
  background: rgba(255, 77, 0, 0.05);
  border-left: 3px solid var(--color-orange);
  padding: 16px 20px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.article-body {
  font-size: 1rem;
  color: #333333;
  line-height: 1.85;
}

.article-body h2 {
  font-size: 1.45rem;
  font-weight: 800;
  color: var(--color-dark);
  margin: 40px 0 16px;
  letter-spacing: -0.02em;
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 8px;
}

.article-body h3 {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-dark);
  margin: 28px 0 12px;
}

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

.article-body ul, .article-body ol {
  margin-bottom: 22px;
  padding-left: 24px;
}

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

.article-body a {
  color: var(--color-orange);
  text-decoration: underline;
  text-underline-offset: 3px;
  font-weight: 600;
}

.article-cta-box {
  margin: 48px 0;
  background: #ffffff;
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-orange);
  padding: 30px;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-sm);
}

.article-faq-box {
  margin: 48px 0;
  background: var(--bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 30px;
}

@media (max-width: 1024px) {
  .kb-grid-3x3 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .kb-grid-3x3 {
    grid-template-columns: 1fr;
  }
}

/* ==========================================================================
   网站地图小卡片栅格系统 (SiteMap Card Grid System)
   ========================================================================== */
.sitemap-section {
  margin-bottom: 52px;
}

.sitemap-section-title {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--color-dark);
  margin-bottom: 22px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-border);
  letter-spacing: -0.02em;
}

.sitemap-section-title svg {
  color: var(--color-orange);
  flex-shrink: 0;
}

.sitemap-cards-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.sitemap-card {
  display: flex;
  flex-direction: column;
  background: var(--bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 24px 22px;
  text-decoration: none;
  color: inherit;
  transition: var(--transition);
  position: relative;
  backdrop-filter: blur(8px);
}

.sitemap-card:hover {
  background: #ffffff;
  border-color: var(--color-dark);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.sitemap-card:hover .sitemap-card-title {
  color: var(--color-orange);
}

.sitemap-card:hover .sitemap-card-action {
  transform: translateX(4px);
}

.sitemap-card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}

.sitemap-card-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--color-dim);
  background: rgba(26, 26, 26, 0.05);
  border: 1px solid var(--color-border);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
}

.sitemap-card-icon {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  background: rgba(255, 77, 0, 0.08);
  border: 1px solid rgba(255, 77, 0, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-orange);
}

.sitemap-card-title {
  font-size: 1.08rem;
  font-weight: 800;
  color: var(--color-dark);
  margin-bottom: 8px;
  line-height: 1.35;
  letter-spacing: -0.01em;
  transition: color 0.2s ease;
}

.sitemap-card-desc {
  font-size: 0.86rem;
  color: #555555;
  line-height: 1.62;
  margin-bottom: 18px;
  flex-grow: 1;
}

.sitemap-card-action {
  display: flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--color-orange);
  transition: transform 0.2s ease;
  margin-top: auto;
}

.sitemap-card-cta {
  background: #ffffff;
  border-left: 3px solid var(--color-orange);
}

@media (max-width: 1024px) {
  .sitemap-cards-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .sitemap-cards-grid {
    grid-template-columns: 1fr;
  }
}