/* ==========================================================================
   xxyun 官网落地页 - Neo-Brutalism (新野兽主义) 增效 CSS 样式库
   全网独家复古波点波浪、几何网格、撞色立体阴影与浮动星形装饰
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@600;700;800;900&display=swap');

:root {
  --yellow: #FFE600;
  --yellow-hover: #FFF500;
  --purple: #7C3AED;
  --purple-light: #C4B5FD;
  --purple-dark: #5B21B6;
  --cyan: #00F0FF;
  --pink: #FF007A;
  --green: #00E676;
  --orange: #FF6B00;
  --bg-main: #FAF8F3;
  --card-bg: #FFFFFF;
  --black: #000000;
  --white: #FFFFFF;
  --gray-100: #F3F4F6;
  --gray-200: #E5E7EB;
  --gray-800: #1F2937;
  
  --border-width: 3px;
  --border: var(--border-width) solid var(--black);
  --shadow-sm: 4px 4px 0px var(--black);
  --shadow-md: 6px 6px 0px var(--black);
  --shadow-lg: 10px 10px 0px var(--black);
  --shadow-hover: 9px 9px 0px var(--black);
  --shadow-active: 2px 2px 0px var(--black);
  
  --radius: 14px;
  --radius-sm: 8px;
  --radius-lg: 20px;
  
  --container-width: 1160px;
}

/* --- 全局波点 + 复古坐标方格纹理背景 --- */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
  background-color: var(--bg-main);
  /* Neo-Brutalist 经典波点 + 方格纸混合纹理 */
  background-image: 
    radial-gradient(rgba(0, 0, 0, 0.12) 1.5px, transparent 1.5px),
    linear-gradient(to right, rgba(0, 0, 0, 0.035) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(0, 0, 0, 0.035) 1px, transparent 1px);
  background-size: 24px 24px, 48px 48px, 48px 48px;
  background-position: 0 0, 0 0, 0 0;
  color: var(--black);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  position: relative;
}

/* 居中版式容器 */
.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 20px;
  position: relative;
  z-index: 2;
}

/* --- 飘浮的新野兽主义复古几何图形装饰 (Floating Shapes) --- */
.bg-decor-shape {
  position: absolute;
  z-index: 1;
  pointer-events: none;
  font-weight: 900;
  user-select: none;
  opacity: 0.85;
}

.decor-star-1 {
  top: 140px; left: 3%;
  font-size: 3rem;
  color: var(--yellow);
  text-shadow: 3px 3px 0px #000;
  animation: floatRot 6s ease-in-out infinite alternate;
}

.decor-star-2 {
  top: 480px; right: 2%;
  font-size: 3.5rem;
  color: var(--purple);
  text-shadow: 3px 3px 0px #000;
  animation: floatRot 8s ease-in-out infinite alternate-reverse;
}

.decor-cross-1 {
  top: 1100px; left: 2%;
  font-size: 2.5rem;
  color: var(--cyan);
  text-shadow: 2px 2px 0px #000;
}

.decor-circle-1 {
  top: 1750px; right: 3%;
  width: 60px; height: 60px;
  border: 4px solid var(--black);
  background-color: var(--pink);
  border-radius: 50%;
  box-shadow: 4px 4px 0px var(--black);
  transform: rotate(15deg);
}

@keyframes floatRot {
  0% { transform: translateY(0) rotate(0deg); }
  100% { transform: translateY(-18px) rotate(15deg); }
}

/* --- 按钮与贴纸组件 --- */
.neo-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 800;
  font-size: 1rem;
  padding: 14px 28px;
  border: var(--border);
  border-radius: var(--radius-sm);
  background-color: var(--yellow);
  color: var(--black);
  box-shadow: var(--shadow-md);
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background-color 0.15s ease;
  user-select: none;
  white-space: nowrap;
}

.neo-btn:hover {
  transform: translate(-3px, -3px);
  box-shadow: var(--shadow-hover);
}

.neo-btn:active {
  transform: translate(2px, 2px);
  box-shadow: var(--shadow-active);
}

.neo-btn-purple {
  background-color: var(--purple);
  color: var(--white);
}
.neo-btn-purple:hover { background-color: var(--purple-dark); }
.neo-btn-cyan { background-color: var(--cyan); color: var(--black); }
.neo-btn-pink { background-color: var(--pink); color: var(--white); }
.neo-btn-white { background-color: var(--white); color: var(--black); }

.neo-btn-lg {
  font-size: 1.15rem;
  padding: 18px 38px;
  border-radius: var(--radius);
}

/* 贴纸 Badge */
.sticker {
  display: inline-block;
  padding: 6px 16px;
  font-weight: 900;
  font-size: 0.88rem;
  border: var(--border);
  box-shadow: var(--shadow-sm);
  border-radius: 30px;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  transform: rotate(-2deg);
  white-space: nowrap;
  transition: transform 0.2s ease;
}

.sticker:hover {
  transform: rotate(1deg) scale(1.05);
}

.sticker-yellow { background-color: var(--yellow); color: var(--black); }
.sticker-purple { background-color: var(--purple); color: var(--white); }
.sticker-cyan { background-color: var(--cyan); color: var(--black); }
.sticker-pink { background-color: var(--pink); color: var(--white); }
.sticker-green { background-color: var(--green); color: var(--black); }

/* 板块标题组件（带有醒目的黄紫高亮底座） */
.section-header {
  text-align: center;
  margin-bottom: 55px;
  position: relative;
}

.section-header .section-tag {
  margin-bottom: 14px;
}

.section-header h2 {
  font-size: 2.6rem;
  margin-bottom: 12px;
  display: inline-block;
  position: relative;
}

/* 板块标题高亮背板 */
.title-highlight-yellow {
  background-color: var(--yellow);
  padding: 2px 16px;
  border: var(--border);
  box-shadow: 4px 4px 0px var(--black);
  transform: rotate(-1deg);
  display: inline-block;
  border-radius: 6px;
}

.title-highlight-purple {
  background-color: var(--purple);
  color: var(--white);
  padding: 2px 16px;
  border: var(--border);
  box-shadow: 4px 4px 0px var(--black);
  transform: rotate(1deg);
  display: inline-block;
  border-radius: 6px;
}

.section-header p {
  font-size: 1.15rem;
  font-weight: 700;
  color: #4B5563;
  max-width: 700px;
  margin: 14px auto 0 auto;
}

/* --- 1. 顶部导航栏 --- */
.site-header {
  position: sticky;
  top: 15px;
  z-index: 1000;
  margin-bottom: 35px;
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background-color: var(--white);
  border: var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
  padding: 14px 28px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.6rem;
  font-weight: 900;
  color: var(--black);
}

.brand-logo .logo-badge {
  background-color: var(--yellow);
  border: 2px solid var(--black);
  padding: 2px 8px;
  border-radius: 6px;
  font-size: 0.8rem;
}

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

.nav-links a {
  font-weight: 800;
  font-size: 0.95rem;
  transition: color 0.15s ease;
  position: relative;
}

.nav-links a:hover {
  color: var(--purple);
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0%;
  height: 3px;
  background-color: var(--yellow);
  transition: width 0.2s ease;
}

.nav-links a:hover::after {
  width: 100%;
}

.header-cta {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* --- 2. Hero 视觉主场 --- */
.hero-section {
  padding: 20px 0 60px 0;
  position: relative;
}

.hero-card {
  background-color: var(--white);
  border: var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: 60px 40px;
  text-align: center;
  position: relative;
  overflow: hidden;
  /* 背景复古对角黑线方格 */
  background-image: 
    linear-gradient(135deg, rgba(255, 230, 0, 0.15) 25%, transparent 25%), 
    linear-gradient(225deg, rgba(255, 230, 0, 0.15) 25%, transparent 25%);
  background-size: 60px 60px;
}

/* 右上角与左下角复古波点装饰卡片 */
.hero-card::before {
  content: '';
  position: absolute;
  top: -20px; right: -20px;
  width: 140px; height: 140px;
  background: radial-gradient(circle, var(--purple) 25%, transparent 25%);
  background-size: 16px 16px;
  opacity: 0.25;
  transform: rotate(12deg);
}

.hero-card::after {
  content: '';
  position: absolute;
  bottom: -20px; left: -20px;
  width: 140px; height: 140px;
  background: radial-gradient(circle, var(--yellow) 30%, transparent 30%);
  background-size: 16px 16px;
  opacity: 0.35;
}

.hero-stickers-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 15px;
  flex-wrap: wrap;
  margin-bottom: 28px;
  position: relative;
  z-index: 3;
}

.hero-title {
  font-size: 3.8rem;
  line-height: 1.12;
  margin-bottom: 22px;
  position: relative;
  z-index: 3;
}

.hero-title .highlight-yellow {
  background-color: var(--yellow);
  padding: 4px 14px;
  border: 3px solid var(--black);
  display: inline-block;
  transform: rotate(-1.5deg);
  box-shadow: 5px 5px 0px var(--black);
  border-radius: 8px;
}

.hero-title .highlight-purple {
  color: var(--purple);
  text-shadow: 3px 3px 0px var(--black);
}

.hero-subtitle {
  font-size: 1.35rem;
  font-weight: 700;
  color: #374151;
  max-width: 800px;
  margin: 0 auto 38px auto;
  position: relative;
  z-index: 3;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 22px;
  flex-wrap: wrap;
  margin-bottom: 50px;
  position: relative;
  z-index: 3;
}

/* 核心优势数据跑马灯 */
.stats-ticker {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  background-color: var(--bg-main);
  border: var(--border);
  border-radius: var(--radius);
  padding: 22px;
  box-shadow: var(--shadow-sm);
  position: relative;
  z-index: 3;
}

.stat-item {
  text-align: center;
}

.stat-item .stat-num {
  font-size: 2.2rem;
  font-weight: 900;
  color: var(--purple);
  text-shadow: 1px 1px 0px var(--black);
}

.stat-item .stat-label {
  font-size: 0.92rem;
  font-weight: 800;
  color: #4B5563;
}

/* --- 3. 核心优势板块 --- */
.advantages-section {
  padding: 70px 0;
  position: relative;
}

.advantages-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}

.advantage-card {
  background-color: var(--white);
  border: var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
  padding: 34px 26px;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  position: relative;
  overflow: hidden;
}

.advantage-card::before {
  content: '';
  position: absolute;
  top: 0; right: 0;
  width: 60px; height: 60px;
  background-color: rgba(0, 0, 0, 0.03);
  border-bottom-left-radius: 60px;
}

.advantage-card:hover {
  transform: translate(-5px, -5px);
  box-shadow: var(--shadow-hover);
}

.advantage-icon {
  width: 64px;
  height: 64px;
  border: var(--border);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  margin-bottom: 22px;
  box-shadow: var(--shadow-sm);
}

.bg-yellow { background-color: var(--yellow); }
.bg-purple { background-color: var(--purple-light); }
.bg-cyan { background-color: var(--cyan); }
.bg-pink { background-color: var(--pink); }
.bg-green { background-color: var(--green); }
.bg-orange { background-color: var(--orange); }

.advantage-card h3 {
  font-size: 1.4rem;
  margin-bottom: 12px;
}

.advantage-card p {
  color: #4B5563;
  font-size: 0.98rem;
  font-weight: 600;
  line-height: 1.6;
}

/* --- 4. 节点延迟和状态板块 (黑底赛博朋克极光风格背景背板) --- */
.nodes-section {
  padding: 70px 0;
}

.nodes-card {
  background-color: #12131C;
  color: var(--white);
  border: var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: 45px;
  position: relative;
  /* 赛博朋克复古网格背景 */
  background-image: 
    linear-gradient(rgba(124, 58, 237, 0.15) 1px, transparent 1px),
    linear-gradient(90deg, rgba(124, 58, 237, 0.15) 1px, transparent 1px);
  background-size: 30px 30px;
}

.nodes-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 35px;
  flex-wrap: wrap;
  gap: 15px;
}

.nodes-title {
  display: flex;
  align-items: center;
  gap: 14px;
}

.nodes-title h2 {
  color: var(--white);
}

.pulse-dot {
  width: 16px;
  height: 16px;
  background-color: var(--green);
  border: 2px solid var(--black);
  border-radius: 50%;
  box-shadow: 0 0 0 0 rgba(0, 230, 118, 0.8);
  animation: pulse 1.6s infinite;
}

@keyframes pulse {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(0, 230, 118, 0.8); }
  70% { transform: scale(1); box-shadow: 0 0 0 12px rgba(0, 230, 118, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(0, 230, 118, 0); }
}

.nodes-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.node-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background-color: #1E202E;
  border: 2.5px solid #374151;
  border-radius: var(--radius-sm);
  padding: 18px 22px;
  box-shadow: 4px 4px 0px #000;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.node-item:hover {
  border-color: var(--yellow);
  transform: translateY(-2px);
}

.node-info {
  display: flex;
  align-items: center;
  gap: 14px;
}

.node-flag {
  font-size: 1.8rem;
}

.node-name {
  font-weight: 800;
  font-size: 1.08rem;
  color: var(--white);
}

.node-type {
  font-size: 0.8rem;
  font-weight: 800;
  background-color: var(--yellow);
  color: var(--black);
  border: 1.5px solid var(--black);
  padding: 2px 7px;
  border-radius: 4px;
  margin-left: 8px;
}

.node-metrics {
  display: flex;
  align-items: center;
  gap: 16px;
}

.node-ping {
  font-family: Consolas, monospace;
  font-weight: 900;
  font-size: 1.1rem;
  color: #10B981;
  background-color: #064E3B;
  border: 1.5px solid #10B981;
  padding: 4px 12px;
  border-radius: 6px;
}

.node-status-badge {
  font-size: 0.85rem;
  font-weight: 800;
  padding: 4px 12px;
  border: 1.5px solid var(--black);
  border-radius: 6px;
  background-color: var(--green);
  color: var(--black);
}

/* --- 5. 套餐价格板块 (带有黄色方格网纹包覆背景) --- */
.pricing-section {
  padding: 70px 0;
  position: relative;
}

.pricing-toggle-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 50px;
}

.pricing-toggle-wrap .toggle-btn {
  padding: 10px 24px;
  font-weight: 900;
  font-size: 1rem;
  border: var(--border);
  border-radius: 30px;
  background-color: var(--white);
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: all 0.2s ease;
}

.pricing-toggle-wrap .toggle-btn.active {
  background-color: var(--purple);
  color: var(--white);
  box-shadow: var(--shadow-md);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
}

.pricing-card {
  background-color: var(--white);
  border: var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
  padding: 34px 26px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.pricing-card:hover {
  transform: translate(-5px, -5px);
  box-shadow: var(--shadow-hover);
}

.pricing-card.featured {
  background-color: #FEFCE8;
  background-image: radial-gradient(var(--yellow) 30%, transparent 30%);
  background-size: 18px 18px;
  border-width: 4px;
  transform: scale(1.03);
  box-shadow: var(--shadow-lg);
}

.pricing-card.featured:hover {
  transform: scale(1.03) translate(-4px, -4px);
}

.pricing-badge {
  position: absolute;
  top: -16px;
  right: 16px;
}

.pricing-header h3 {
  font-size: 1.55rem;
  margin-bottom: 10px;
}

.pricing-price {
  font-size: 3rem;
  font-weight: 900;
  margin-bottom: 4px;
  display: flex;
  align-items: baseline;
  gap: 4px;
  color: var(--black);
}

.pricing-price span {
  font-size: 1.05rem;
  font-weight: 800;
  color: #6B7280;
}

.pricing-desc {
  font-size: 0.92rem;
  color: #4B5563;
  font-weight: 700;
  margin-bottom: 26px;
}

.pricing-features {
  list-style: none;
  margin-bottom: 32px;
}

.pricing-features li {
  font-weight: 700;
  font-size: 0.95rem;
  padding: 9px 0;
  border-bottom: 1.5px dashed var(--gray-200);
  display: flex;
  align-items: center;
  gap: 10px;
}

.pricing-features li::before {
  content: '✓';
  font-weight: 900;
  color: var(--black);
  background-color: var(--yellow);
  border: 1.5px solid var(--black);
  width: 22px;
  height: 22px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  flex-shrink: 0;
}

/* --- 6. 知识库与教程板块 --- */
.kb-section {
  padding: 70px 0;
}

.kb-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
}

.article-card {
  background-color: var(--white);
  border: var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
  padding: 26px 22px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  position: relative;
}

.article-card:hover {
  transform: translate(-5px, -5px);
  box-shadow: var(--shadow-hover);
}

.article-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.82rem;
  font-weight: 800;
  margin-bottom: 14px;
}

.article-cat {
  background-color: var(--yellow);
  border: 1.5px solid var(--black);
  padding: 2px 9px;
  border-radius: 4px;
  font-weight: 900;
}

.article-title {
  font-size: 1.15rem;
  font-weight: 900;
  line-height: 1.4;
  margin-bottom: 12px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-summary {
  font-size: 0.9rem;
  color: #4B5563;
  margin-bottom: 22px;
  font-weight: 600;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 2px solid var(--black);
  padding-top: 14px;
  font-size: 0.88rem;
  font-weight: 900;
}

.read-link {
  color: var(--purple);
  display: flex;
  align-items: center;
  gap: 4px;
}

/* --- 7. 用户评价板块 --- */
.reviews-section {
  padding: 70px 0;
}

.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}

.review-card {
  background-color: var(--white);
  border: var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
  padding: 30px 26px;
  position: relative;
  transition: transform 0.2s ease;
}

.review-card:hover {
  transform: translate(-3px, -3px);
}

.review-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 18px;
}

.review-avatar {
  width: 54px;
  height: 54px;
  border: var(--border);
  border-radius: 50%;
  background-color: var(--yellow);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 900;
  font-size: 1.3rem;
  box-shadow: var(--shadow-sm);
}

.review-user-info h4 {
  font-size: 1.1rem;
  margin-bottom: 2px;
}

.review-user-info span {
  font-size: 0.82rem;
  font-weight: 700;
  color: #6B7280;
}

.review-stars {
  color: #F59E0B;
  margin-bottom: 14px;
  font-size: 1.15rem;
}

.review-comment {
  font-size: 0.98rem;
  color: #374151;
  font-weight: 600;
  line-height: 1.6;
}

/* --- 8. 常见问题板块 (FAQ Accordion) --- */
.faq-section {
  padding: 70px 0;
}

.faq-container {
  max-width: 880px;
  margin: 0 auto;
}

.faq-item {
  background-color: var(--white);
  border: var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
  margin-bottom: 20px;
  overflow: hidden;
}

.faq-question {
  width: 100%;
  padding: 22px 26px;
  background: none;
  border: none;
  text-align: left;
  font-size: 1.18rem;
  font-weight: 900;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  color: var(--black);
}

.faq-icon {
  width: 36px;
  height: 36px;
  border: var(--border);
  border-radius: 50%;
  background-color: var(--yellow);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 900;
  font-size: 1.2rem;
  transition: transform 0.25s ease, background-color 0.25s ease;
  box-shadow: var(--shadow-sm);
  flex-shrink: 0;
}

.faq-item.active .faq-icon {
  transform: rotate(45deg);
  background-color: var(--purple);
  color: var(--white);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s cubic-bezier(0, 1, 0, 1), padding 0.35s ease;
  padding: 0 26px;
  color: #374151;
  font-weight: 600;
  line-height: 1.7;
}

.faq-item.active .faq-answer {
  max-height: 500px;
  padding: 0 26px 26px 26px;
  border-top: 2px dashed var(--gray-200);
}

/* --- 9. 文章模态阅读器 --- */
.modal-overlay {
  position: fixed;
  top: 0; left: 0;
  width: 100vw; height: 100vh;
  background-color: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(6px);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
}

.modal-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.modal-content-wrapper {
  background-color: var(--bg-main);
  border: var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  width: 100%;
  max-width: 920px;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  position: relative;
}

.modal-header {
  background-color: var(--white);
  border-bottom: var(--border);
  padding: 22px 30px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-header h3 {
  font-size: 1.35rem;
}

.close-modal-btn {
  background-color: var(--yellow);
  border: var(--border);
  border-radius: 50%;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 900;
  font-size: 1.1rem;
  cursor: pointer;
  box-shadow: var(--shadow-sm);
}

.modal-body {
  padding: 40px;
  overflow-y: auto;
  font-size: 1.05rem;
  line-height: 1.85;
  color: #1F2937;
}

.modal-body h2 {
  font-size: 1.85rem;
  margin: 34px 0 18px 0;
  padding-bottom: 8px;
  border-bottom: 3px solid var(--black);
}

.modal-body h3 {
  font-size: 1.4rem;
  margin: 26px 0 14px 0;
}

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

.modal-body ul, .modal-body ol {
  margin: 0 0 24px 26px;
}

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

.code-box {
  background-color: #181825;
  color: #CDD6F4;
  border: var(--border);
  border-radius: var(--radius-sm);
  margin: 24px 0;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.code-header {
  background-color: #11111B;
  border-bottom: 2px solid var(--black);
  padding: 12px 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-family: monospace;
  font-size: 0.88rem;
  color: #A6ADC8;
}

.copy-btn {
  background-color: var(--yellow);
  border: 1.5px solid var(--black);
  padding: 4px 12px;
  border-radius: 4px;
  font-weight: 900;
  cursor: pointer;
  font-size: 0.78rem;
}

.code-box pre {
  padding: 18px;
  overflow-x: auto;
  font-family: Consolas, Monaco, 'Courier New', monospace;
  font-size: 0.92rem;
  line-height: 1.55;
}

.article-table {
  width: 100%;
  border-collapse: collapse;
  margin: 26px 0;
  border: var(--border);
  background-color: var(--white);
  box-shadow: var(--shadow-sm);
}

.article-table th, .article-table td {
  border: 1.5px solid var(--black);
  padding: 14px 18px;
  text-align: left;
  font-size: 0.96rem;
}

.article-table th {
  background-color: var(--yellow);
  font-weight: 900;
}

/* --- 10. 页脚 --- */
.site-footer {
  background-color: var(--white);
  border-top: var(--border);
  padding: 65px 0 35px 0;
  margin-top: 70px;
  position: relative;
  z-index: 2;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 40px;
  margin-bottom: 45px;
}

.footer-brand h3 {
  font-size: 1.7rem;
  margin-bottom: 14px;
}

.footer-brand p {
  color: #4B5563;
  font-size: 0.95rem;
  margin-bottom: 22px;
  font-weight: 600;
}

.footer-links h4 {
  font-size: 1.15rem;
  margin-bottom: 18px;
  border-bottom: 3px solid var(--black);
  padding-bottom: 4px;
  display: inline-block;
}

.footer-links ul {
  list-style: none;
}

.footer-links li {
  margin-bottom: 12px;
  font-weight: 700;
  font-size: 0.92rem;
}

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

.footer-bottom {
  border-top: 2px dashed var(--gray-200);
  padding-top: 26px;
  text-align: center;
  font-size: 0.88rem;
  font-weight: 700;
  color: #6B7280;
}

/* --- 响应式适配 --- */
@media (max-width: 1024px) {
  .advantages-grid { grid-template-columns: repeat(2, 1fr); }
  .pricing-grid { grid-template-columns: repeat(2, 1fr); }
  .kb-grid { grid-template-columns: repeat(2, 1fr); }
  .reviews-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
  .hero-title { font-size: 3rem; }
}

@media (max-width: 768px) {
  .nav-links { display: none; }
  .hero-title { font-size: 2.3rem; }
  .hero-card { padding: 40px 20px; }
  .stats-ticker { grid-template-columns: repeat(2, 1fr); }
  .advantages-grid { grid-template-columns: 1fr; }
  .nodes-grid { grid-template-columns: 1fr; }
  .pricing-grid { grid-template-columns: 1fr; }
  .pricing-card.featured { transform: none; }
  .kb-grid { grid-template-columns: 1fr; }
  .reviews-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .modal-body { padding: 24px 20px; }
  .decor-star-1, .decor-star-2, .decor-cross-1 { display: none; }
}