/* ==========================================================================
   云图官网 (yuntu.homes) - 新野兽主义风格 (Neo-Brutalism) 核心样式表
   配色：高明度柠檬黄 (#FFE600) + 电光紫 (#7C3AED) + 纯黑硬边框 (#111111)
   布局：内容居中 (max-width: 1200px)，两侧优雅留白，稳重简洁
   ========================================================================== */

:root {
  --yellow: #FFE600;
  --yellow-hover: #FFF033;
  --purple: #7C3AED;
  --purple-light: #8B5CF6;
  --purple-dark: #5B21B6;
  --purple-bg: #F3EEFF;
  --pink: #FF5E97;
  --pink-light: #FFEBF2;
  --mint: #00E599;
  --mint-light: #E6FAF2;
  --cyan: #00F0FF;
  --orange: #FF7B00;
  --black: #111111;
  --dark: #1E1E24;
  --white: #FFFFFF;
  --bg: #F8F7F2;
  --bg-pattern: #EFECE1;
  --gray-100: #F4F4F6;
  --gray-200: #E5E7EB;
  --gray-400: #9CA3AF;
  --gray-700: #374151;

  /* 新野兽主义几何规范 */
  --border-thick: 3px solid var(--black);
  --border-med: 2.5px solid var(--black);
  --border-thin: 2px solid var(--black);
  --shadow-base: 4px 4px 0 var(--black);
  --shadow-lg: 6px 6px 0 var(--black);
  --shadow-xl: 8px 8px 0 var(--black);
  --shadow-sm: 2px 2px 0 var(--black);
  --shadow-inset: inset 2px 2px 0 var(--black);

  --radius-none: 0px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-full: 9999px;

  --transition-fast: 0.15s cubic-bezier(0.2, 0, 0, 1);
  --transition-normal: 0.25s cubic-bezier(0.2, 0, 0, 1);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  scroll-padding-top: 90px;
}

body {
  font-family: 'Space Grotesk', -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background-color: var(--bg);
  background-image: radial-gradient(var(--bg-pattern) 1.5px, transparent 1.5px);
  background-size: 24px 24px;
  color: var(--black);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
}

ul, ol {
  list-style: none;
}

button, input {
  font-family: inherit;
}

/* 页面核心居中容器（两侧留白） */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ==========================================================================
   新野兽主义核心原子类 (Neo-Brutalist Utility Classes)
   ========================================================================== */

.neo-box {
  background: var(--white);
  border: var(--border-thick);
  box-shadow: var(--shadow-base);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

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

.neo-box-nohover {
  background: var(--white);
  border: var(--border-thick);
  box-shadow: var(--shadow-base);
  border-radius: var(--radius-md);
}

/* 按钮风格 */
.btn-neo {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  font-weight: 800;
  font-size: 1.05rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  border: var(--border-thick);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-base);
  cursor: pointer;
  transition: all var(--transition-fast);
  user-select: none;
}

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

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

.btn-neo-yellow {
  background: var(--yellow);
  color: var(--black);
}
.btn-neo-yellow:hover {
  background: var(--yellow-hover);
}

.btn-neo-purple {
  background: var(--purple);
  color: var(--white);
}
.btn-neo-purple:hover {
  background: var(--purple-light);
}

.btn-neo-pink {
  background: var(--pink);
  color: var(--white);
}

.btn-neo-white {
  background: var(--white);
  color: var(--black);
}

.btn-neo-sm {
  padding: 8px 16px;
  font-size: 0.9rem;
}

.btn-neo-lg {
  padding: 16px 36px;
  font-size: 1.2rem;
  font-weight: 900;
}

/* 贴纸 Badge / Tag */
.neo-sticker {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  font-weight: 800;
  font-size: 0.88rem;
  border: var(--border-med);
  box-shadow: var(--shadow-sm);
  border-radius: var(--radius-sm);
  white-space: nowrap;
}

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

.tilt-left { transform: rotate(-2.5deg); }
.tilt-right { transform: rotate(2.5deg); }

/* 板块通性 */
.section {
  padding: 70px 0;
  position: relative;
}

.section-header {
  text-align: center;
  margin-bottom: 50px;
}

.section-tag {
  display: inline-block;
  margin-bottom: 12px;
}

.section-title {
  font-size: 2.5rem;
  font-weight: 900;
  color: var(--black);
  letter-spacing: -0.5px;
  margin-bottom: 14px;
  text-transform: uppercase;
}

.section-desc {
  font-size: 1.15rem;
  color: var(--gray-700);
  max-width: 650px;
  margin: 0 auto;
  font-weight: 500;
}

/* ==========================================================================
   1. 顶部悬浮导航栏 (Sticky Header)
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(248, 247, 242, 0.95);
  backdrop-filter: blur(8px);
  border-bottom: var(--border-thick);
  padding: 12px 0;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.logo-badge {
  background: var(--yellow);
  border: var(--border-thick);
  box-shadow: var(--shadow-sm);
  padding: 6px 12px;
  font-weight: 900;
  font-size: 1.25rem;
  border-radius: var(--radius-sm);
  letter-spacing: -0.5px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.logo-tagline {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--gray-700);
  background: var(--white);
  border: var(--border-thin);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-link {
  font-weight: 700;
  font-size: 0.95rem;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  border: 2px solid transparent;
  transition: all var(--transition-fast);
}

.nav-link:hover {
  background: var(--yellow);
  border: var(--border-thin);
  box-shadow: var(--shadow-sm);
  transform: translate(-1px, -1px);
}

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

.mobile-menu-btn {
  display: none;
  background: var(--yellow);
  border: var(--border-thick);
  padding: 8px 12px;
  font-size: 1.2rem;
  font-weight: 900;
  cursor: pointer;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-sm);
}

/* ==========================================================================
   2. 英雄首屏 (Hero Section)
   ========================================================================== */
.hero-section {
  padding: 60px 0 50px 0;
  overflow: hidden;
}

.hero-wrapper {
  background: var(--white);
  border: var(--border-thick);
  box-shadow: var(--shadow-xl);
  border-radius: var(--radius-lg);
  padding: 50px 40px;
  position: relative;
  overflow: hidden;
}

.hero-corner-badge {
  position: absolute;
  top: 20px;
  right: -35px;
  background: var(--pink);
  color: var(--white);
  font-weight: 900;
  font-size: 0.85rem;
  padding: 6px 45px;
  transform: rotate(45deg);
  border: var(--border-thin);
  box-shadow: var(--shadow-sm);
  letter-spacing: 1px;
}

.hero-sticker-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-bottom: 24px;
}

.hero-headline {
  font-size: 3.4rem;
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -1.5px;
  margin-bottom: 20px;
}

.hero-headline .highlight-yellow {
  background: var(--yellow);
  padding: 2px 12px;
  border: var(--border-thick);
  box-shadow: 4px 4px 0 var(--black);
  display: inline-block;
  margin: 0 4px;
}

.hero-headline .highlight-purple {
  background: var(--purple);
  color: var(--white);
  padding: 2px 12px;
  border: var(--border-thick);
  box-shadow: 4px 4px 0 var(--black);
  display: inline-block;
  margin: 0 4px;
}

.hero-subtext {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--gray-700);
  max-width: 800px;
  margin-bottom: 35px;
  line-height: 1.6;
}

.hero-cta-group {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 20px;
  margin-bottom: 40px;
}

.hero-guarantee {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--gray-700);
}

/* 跑马灯状态条 */
.hero-marquee {
  background: var(--black);
  color: var(--yellow);
  border: var(--border-thick);
  padding: 12px 16px;
  font-weight: 800;
  font-size: 1rem;
  display: flex;
  align-items: center;
  justify-content: space-around;
  flex-wrap: wrap;
  gap: 16px;
  border-radius: var(--radius-sm);
}

.marquee-item {
  display: flex;
  align-items: center;
  gap: 8px;
}

.status-dot-green {
  width: 10px;
  height: 10px;
  background-color: var(--mint);
  border-radius: 50%;
  display: inline-block;
  box-shadow: 0 0 0 3px rgba(0, 229, 153, 0.4);
  animation: pulse-green 1.8s infinite;
}

@keyframes pulse-green {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(0, 229, 153, 0.7); }
  70% { transform: scale(1); box-shadow: 0 0 0 6px rgba(0, 229, 153, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(0, 229, 153, 0); }
}

/* ==========================================================================
   3. 核心优势板块 (Core Advantages)
   ========================================================================== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.feature-card {
  padding: 32px 26px;
  background: var(--white);
  position: relative;
  display: flex;
  flex-direction: column;
}

.feature-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}

.feature-icon-box {
  width: 58px;
  height: 58px;
  border: var(--border-thick);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  box-shadow: var(--shadow-sm);
  border-radius: var(--radius-sm);
}

.feature-num {
  font-size: 1.5rem;
  font-weight: 900;
  color: var(--gray-400);
}

.feature-title {
  font-size: 1.35rem;
  font-weight: 800;
  margin-bottom: 12px;
  color: var(--black);
}

.feature-desc {
  color: var(--gray-700);
  font-size: 0.98rem;
  line-height: 1.65;
  margin-bottom: 20px;
  flex-grow: 1;
}

.feature-tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

/* ==========================================================================
   4. 节点延迟与状态板块 (Node Latency & Status)
   ========================================================================== */
.node-dashboard {
  background: var(--white);
  border: var(--border-thick);
  box-shadow: var(--shadow-xl);
  border-radius: var(--radius-lg);
  padding: 36px;
}

.node-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 28px;
  padding-bottom: 20px;
  border-bottom: var(--border-thick);
}

.node-title-group h3 {
  font-size: 1.5rem;
  font-weight: 900;
  display: flex;
  align-items: center;
  gap: 10px;
}

.node-metrics-summary {
  display: flex;
  align-items: center;
  gap: 20px;
}

.metric-pill {
  border: var(--border-thin);
  padding: 6px 14px;
  font-weight: 700;
  font-size: 0.9rem;
  background: var(--gray-100);
  border-radius: var(--radius-sm);
}

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

.node-item {
  background: var(--bg);
  border: var(--border-thick);
  box-shadow: var(--shadow-base);
  border-radius: var(--radius-md);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  transition: all var(--transition-fast);
}

.node-item:hover {
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-lg);
  background: var(--white);
}

.node-item-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.node-flag-name {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 1.1rem;
}

.node-flag {
  font-size: 1.4rem;
}

.node-stats-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--white);
  border: var(--border-thin);
  padding: 10px 14px;
  border-radius: var(--radius-sm);
}

.node-ping {
  font-weight: 900;
  font-size: 1.25rem;
  color: var(--purple-dark);
}

.node-load-bar-wrap {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.node-load-label {
  display: flex;
  justify-content: space-between;
  font-size: 0.85rem;
  font-weight: 700;
}

.progress-bar-bg {
  width: 100%;
  height: 10px;
  background: var(--gray-200);
  border: var(--border-thin);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  border-radius: var(--radius-full);
  transition: width 0.6s ease;
}

.fill-green { background: var(--mint); }
.fill-yellow { background: var(--yellow); }
.fill-purple { background: var(--purple); }

/* ==========================================================================
   5. 套餐价格板块 (Pricing Plans)
   ========================================================================== */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
}

.pricing-card {
  background: var(--white);
  border: var(--border-thick);
  box-shadow: var(--shadow-base);
  border-radius: var(--radius-lg);
  padding: 30px 22px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all var(--transition-fast);
}

.pricing-card:hover {
  transform: translate(-3px, -3px);
  box-shadow: var(--shadow-xl);
}

.pricing-card.featured {
  background: #FFFDF0;
  border-width: 3.5px;
  border-color: var(--black);
  transform: scale(1.03);
  box-shadow: var(--shadow-xl);
  z-index: 10;
}

.pricing-card.featured:hover {
  transform: scale(1.03) translate(-3px, -3px);
}

.pricing-badge-popular {
  position: absolute;
  top: -16px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--purple);
  color: var(--white);
  border: var(--border-thick);
  box-shadow: var(--shadow-sm);
  padding: 4px 18px;
  font-weight: 900;
  font-size: 0.85rem;
  letter-spacing: 1px;
  border-radius: var(--radius-sm);
  white-space: nowrap;
}

.plan-title {
  font-size: 1.35rem;
  font-weight: 900;
  margin-bottom: 6px;
}

.plan-subtitle {
  font-size: 0.88rem;
  color: var(--gray-700);
  font-weight: 600;
  margin-bottom: 20px;
}

.plan-price-wrap {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 22px;
  padding-bottom: 18px;
  border-bottom: var(--border-thick);
}

.currency {
  font-size: 1.5rem;
  font-weight: 900;
}

.price-amount {
  font-size: 3rem;
  font-weight: 900;
  line-height: 1;
}

.price-cycle {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--gray-700);
}

.plan-features {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 28px;
  flex-grow: 1;
}

.plan-feature-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.92rem;
  font-weight: 600;
}

.check-icon {
  width: 20px;
  height: 20px;
  min-width: 20px;
  border: var(--border-thin);
  background: var(--yellow);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 900;
  border-radius: var(--radius-sm);
  box-shadow: 1px 1px 0 var(--black);
}

/* ==========================================================================
   6. 用户评价板块 (Testimonials)
   ========================================================================== */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.review-card {
  background: var(--white);
  border: var(--border-thick);
  box-shadow: var(--shadow-base);
  border-radius: var(--radius-md);
  padding: 26px;
  display: flex;
  flex-direction: column;
  transition: all var(--transition-fast);
}

.review-card:hover {
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-lg);
}

.review-user-row {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 16px;
}

.user-avatar {
  width: 50px;
  height: 50px;
  border: var(--border-thick);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
}

.user-meta {
  display: flex;
  flex-direction: column;
}

.user-name {
  font-weight: 900;
  font-size: 1.1rem;
}

.user-identity {
  font-size: 0.85rem;
  color: var(--gray-700);
  font-weight: 600;
}

.review-stars {
  color: #FFAA00;
  font-size: 1.1rem;
  margin-bottom: 12px;
  display: flex;
  gap: 2px;
}

.review-text {
  font-size: 0.95rem;
  color: var(--dark);
  line-height: 1.6;
  margin-bottom: 18px;
  flex-grow: 1;
  font-style: italic;
}

.review-highlight-tag {
  align-self: flex-start;
}

/* ==========================================================================
   7. 常见问题板块 (FAQ)
   ========================================================================== */
.faq-wrap {
  max-width: 900px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.faq-item {
  background: var(--white);
  border: var(--border-thick);
  box-shadow: var(--shadow-base);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: all var(--transition-fast);
}

.faq-question {
  padding: 22px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  font-weight: 900;
  font-size: 1.15rem;
  user-select: none;
  background: var(--white);
  gap: 16px;
}

.faq-question:hover {
  background: var(--yellow);
}

.faq-toggle-icon {
  width: 32px;
  height: 32px;
  border: var(--border-thick);
  background: var(--white);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 900;
  font-size: 1.2rem;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-sm);
  transition: transform 0.25s ease;
}

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

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease-out;
  background: #FCFCFA;
  border-top: 0px solid transparent;
}

.faq-item.active .faq-answer {
  border-top: var(--border-thick);
  padding: 22px 24px;
  max-height: 400px;
}

.faq-answer p {
  color: var(--gray-700);
  font-size: 1.02rem;
  line-height: 1.7;
}

/* ==========================================================================
   8. 知识库与教程板块 (Knowledge Base & Articles)
   ========================================================================== */
.tutorials-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
}

.tutorial-card {
  background: var(--white);
  border: var(--border-thick);
  box-shadow: var(--shadow-base);
  border-radius: var(--radius-md);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: all var(--transition-fast);
}

.tutorial-card:hover {
  transform: translate(-3px, -3px);
  box-shadow: var(--shadow-lg);
}

.tutorial-card-banner {
  padding: 24px 20px;
  border-bottom: var(--border-thick);
  font-size: 2.2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.tutorial-body {
  padding: 20px;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.tutorial-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--gray-700);
}

.tutorial-title {
  font-size: 1.15rem;
  font-weight: 800;
  line-height: 1.4;
  margin-bottom: 12px;
  color: var(--black);
}

.tutorial-excerpt {
  font-size: 0.9rem;
  color: var(--gray-700);
  line-height: 1.6;
  margin-bottom: 18px;
  flex-grow: 1;
}

.tutorial-link-btn {
  font-weight: 800;
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--purple-dark);
}

.tutorial-link-btn:hover {
  text-decoration: underline;
}

/* ==========================================================================
   全站底部与转化 Banner (Footer & Bottom CTA)
   ========================================================================== */
.cta-banner-section {
  padding: 50px 0;
}

.cta-banner-box {
  background: var(--purple);
  color: var(--white);
  border: var(--border-thick);
  box-shadow: var(--shadow-xl);
  border-radius: var(--radius-lg);
  padding: 50px 40px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 30px;
}

.cta-text-content h2 {
  font-size: 2.4rem;
  font-weight: 900;
  margin-bottom: 10px;
  line-height: 1.2;
}

.cta-text-content p {
  font-size: 1.15rem;
  opacity: 0.9;
  font-weight: 500;
}

.site-footer {
  background: var(--black);
  color: var(--white);
  border-top: 4px solid var(--yellow);
  padding: 60px 0 30px 0;
}

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

.footer-brand h4 {
  font-size: 1.5rem;
  font-weight: 900;
  color: var(--yellow);
  margin-bottom: 14px;
}

.footer-desc {
  font-size: 0.95rem;
  color: var(--gray-400);
  line-height: 1.7;
  max-width: 360px;
}

.footer-col h5 {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--white);
  margin-bottom: 18px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links a {
  color: var(--gray-400);
  font-size: 0.92rem;
  font-weight: 600;
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: var(--yellow);
  text-decoration: underline;
}

.footer-bottom {
  padding-top: 25px;
  border-top: 1px solid #333;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.88rem;
  color: var(--gray-400);
}

/* ==========================================================================
   文章详情页排版风格 (Articles Reading View)
   ========================================================================== */
.article-layout {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 36px;
  padding: 40px 0 80px 0;
}

.article-main {
  background: var(--white);
  border: var(--border-thick);
  box-shadow: var(--shadow-xl);
  border-radius: var(--radius-lg);
  padding: 45px;
}

.article-breadcrumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--gray-700);
  margin-bottom: 24px;
}

.article-header {
  border-bottom: var(--border-thick);
  padding-bottom: 24px;
  margin-bottom: 32px;
}

.article-headline {
  font-size: 2.3rem;
  font-weight: 900;
  line-height: 1.25;
  margin-bottom: 16px;
  color: var(--black);
}

.article-info-bar {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--gray-700);
}

.article-body h2 {
  font-size: 1.75rem;
  font-weight: 900;
  margin: 36px 0 18px 0;
  padding-bottom: 8px;
  border-bottom: var(--border-thin);
  color: var(--black);
}

.article-body h3 {
  font-size: 1.35rem;
  font-weight: 800;
  margin: 26px 0 14px 0;
  color: var(--purple-dark);
}

.article-body p {
  font-size: 1.05rem;
  line-height: 1.8;
  color: #222;
  margin-bottom: 20px;
}

.article-body ul, .article-body ol {
  margin: 16px 0 24px 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.article-body ul {
  list-style: square;
}

.article-body ol {
  list-style: decimal;
}

.article-body li {
  font-size: 1.02rem;
  line-height: 1.7;
}

.article-callout {
  background: var(--yellow);
  border: var(--border-thick);
  box-shadow: var(--shadow-base);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  margin: 28px 0;
  font-weight: 700;
}

.article-callout-purple {
  background: var(--purple-bg);
  border: var(--border-thick);
  box-shadow: var(--shadow-base);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  margin: 28px 0;
}

.article-code-box {
  background: var(--dark);
  color: var(--white);
  border: var(--border-thick);
  box-shadow: var(--shadow-base);
  border-radius: var(--radius-md);
  padding: 18px 20px;
  margin: 24px 0;
  overflow-x: auto;
  font-family: 'Consolas', 'Courier New', monospace;
  font-size: 0.92rem;
  line-height: 1.6;
}

.article-sidebar {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.sidebar-card {
  background: var(--white);
  border: var(--border-thick);
  box-shadow: var(--shadow-base);
  border-radius: var(--radius-md);
  padding: 24px;
}

.sidebar-title {
  font-size: 1.15rem;
  font-weight: 900;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: var(--border-thin);
}

.toc-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.toc-link {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--gray-700);
  transition: color var(--transition-fast);
}

.toc-link:hover {
  color: var(--purple);
  font-weight: 800;
  text-decoration: underline;
}

/* ==========================================================================
   响应式断点适配 (Responsive Media Queries)
   ========================================================================== */
@media (max-width: 1024px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-card.featured {
    transform: none;
  }
  .tutorials-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-top {
    grid-template-columns: 1fr 1fr;
  }
  .article-layout {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .nav-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 20px;
    right: 20px;
    background: var(--white);
    border: var(--border-thick);
    box-shadow: var(--shadow-xl);
    border-radius: var(--radius-md);
    flex-direction: column;
    padding: 20px;
    gap: 12px;
    z-index: 1000;
  }
  .nav-menu.mobile-open {
    display: flex;
  }
  .header-actions .hide-mobile {
    display: none;
  }
  .mobile-menu-btn {
    display: block;
  }
  .hero-headline {
    font-size: 2.3rem;
  }
  .hero-wrapper {
    padding: 30px 20px;
  }
  .features-grid {
    grid-template-columns: 1fr;
  }
  .node-grid {
    grid-template-columns: 1fr;
  }
  .pricing-grid {
    grid-template-columns: 1fr;
  }
  .reviews-grid {
    grid-template-columns: 1fr;
  }
  .tutorials-grid {
    grid-template-columns: 1fr;
  }
  .cta-banner-box {
    padding: 30px 20px;
    flex-direction: column;
    text-align: center;
  }
  .footer-top {
    grid-template-columns: 1fr;
  }
  .article-main {
    padding: 24px 18px;
  }
  .article-headline {
    font-size: 1.8rem;
  }
}