/* ==========================================================================
   BAJIEVPN (八戒机场) - 实验风 (Dev Avant-Garde / Neo-Brutalist) 官方样式表
   设计灵感：网格背景、纯黑粗线框、荧光色块拼贴、极客控制台、平滑现代微动效
   ========================================================================== */

:root {
  --bg-color: #fafaf8;
  --bg-grid: #e5e5df;
  --text-main: #0c0d0e;
  --text-muted: #575a61;
  --text-light: #8e929b;
  --border-dark: #000000;
  --border-thin: #1a1a1a;
  
  /* 品牌前卫强调色 (参考图1色彩) */
  --c-pink: #ff007a;
  --c-orange: #ff9100;
  --c-cyan: #00d2ff;
  --c-lime: #d4ff00;
  --c-purple: #7928ca;
  --c-green-dark: #1e3a2f; /* 参考图2套餐二沉稳深绿 */
  --c-green-light: #2ee69c;
  --c-card-bg: #ffffff;
  
  --font-mono: "JetBrains Mono", "Fira Code", Menlo, Monaco, Consolas, "Courier New", monospace;
  --font-display: "Clash Display", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  
  --shadow-neo: 4px 4px 0px #000000;
  --shadow-neo-lg: 8px 8px 0px #000000;
  --shadow-neo-sm: 2px 2px 0px #000000;
  --shadow-hover: 6px 6px 0px #000000;
  --radius-sm: 2px;
  --radius-md: 4px;
}

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

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

body {
  background-color: var(--bg-color);
  background-image: 
    linear-gradient(to right, var(--bg-grid) 1px, transparent 1px),
    linear-gradient(to bottom, var(--bg-grid) 1px, transparent 1px);
  background-size: 32px 32px;
  background-position: 0 0;
  color: var(--text-main);
  font-family: var(--font-body);
  line-height: 1.65;
  overflow-x: hidden;
  position: relative;
  -webkit-font-smoothing: antialiased;
}

/* 动态点缀光晕 */
.ambient-glow {
  position: fixed;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.35;
  pointer-events: none;
  z-index: 0;
  transition: transform 0.8s ease-out;
}
.glow-cyan {
  width: 450px;
  height: 450px;
  background: radial-gradient(circle, #00d2ff 0%, rgba(0, 210, 255, 0) 70%);
  top: 10%;
  left: -100px;
  animation: floatOrb 18s ease-in-out infinite alternate;
}
.glow-lime {
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, #d4ff00 0%, rgba(212, 255, 0, 0) 70%);
  top: 15%;
  right: -120px;
  animation: floatOrb 22s ease-in-out infinite alternate-reverse;
}
.glow-pink {
  width: 420px;
  height: 420px;
  background: radial-gradient(circle, #ff007a 0%, rgba(255, 0, 122, 0) 70%);
  bottom: 25%;
  left: 20%;
  animation: floatOrb 20s ease-in-out infinite alternate;
}

@keyframes floatOrb {
  0% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(40px, 30px) scale(1.08); }
  100% { transform: translate(-30px, 60px) scale(0.95); }
}

/* 容器 */
.container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

/* 链接样式 */
a {
  color: inherit;
  text-decoration: none;
}

/* 顶部顶条通知栏 */
.top-notice-bar {
  background: #000;
  color: #fff;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  padding: 8px 16px;
  border-bottom: 2px solid #000;
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: relative;
  z-index: 101;
}
.notice-tag {
  background: var(--c-pink);
  color: #fff;
  padding: 2px 8px;
  font-weight: 700;
  margin-right: 8px;
  border-radius: var(--radius-sm);
}
.notice-cta {
  color: var(--c-lime);
  text-decoration: underline;
  margin-left: 8px;
  font-weight: 600;
}

/* 顶栏 Header (图1实验风线框) */
.header-wrapper {
  padding: 20px 0;
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(250, 250, 248, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 2px solid var(--border-dark);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.brand-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: #000;
  color: #fff;
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: 1.1rem;
  letter-spacing: 0.5px;
  padding: 8px 16px;
  border: 2px solid #000;
  box-shadow: var(--shadow-neo-sm);
  transition: all 0.2s ease;
}
.brand-badge:hover {
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-neo);
  background: #111;
}
.brand-badge span.dot {
  display: inline-block;
  width: 10px;
  height: 10px;
  background: var(--c-lime);
  border-radius: 50%;
  animation: pulse 1.5s infinite;
}
@keyframes pulse {
  0% { transform: scale(0.9); opacity: 0.8; }
  50% { transform: scale(1.3); opacity: 1; }
  100% { transform: scale(0.9); opacity: 0.8; }
}

/* 导航栏模块化线框按钮 (图1风格) */
.nav-box {
  display: flex;
  align-items: center;
  gap: 8px;
  background: #fff;
  padding: 4px;
  border: 2px solid var(--border-dark);
  box-shadow: var(--shadow-neo-sm);
}
.nav-link {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 600;
  padding: 6px 14px;
  border: 1px solid transparent;
  color: var(--text-main);
  transition: all 0.15s ease;
  white-space: nowrap;
}
.nav-link:hover, .nav-link.active {
  background: #000;
  color: #fff;
  border-color: #000;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}
.btn-cmd {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  background: #fff;
  border: 2px solid #000;
  padding: 7px 12px;
  box-shadow: var(--shadow-neo-sm);
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
}
.btn-register-primary {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 800;
  background: var(--c-lime);
  color: #000;
  border: 2px solid #000;
  padding: 8px 18px;
  box-shadow: var(--shadow-neo);
  transition: all 0.18s ease;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.btn-register-primary:hover {
  background: #e1ff33;
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-hover);
}

/* 移动端菜单开关 */
.mobile-toggle {
  display: none;
  background: #000;
  color: #fff;
  border: none;
  padding: 8px 12px;
  font-family: var(--font-mono);
  font-weight: bold;
  cursor: pointer;
}

/* HERO SECTION - 参考图1 Avant-Garde 视觉结构 */
.hero-section {
  padding: 60px 0 80px;
  position: relative;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 40px;
  align-items: center;
}
.hero-tag-pill {
  display: inline-block;
  background: var(--c-pink);
  color: #fff;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 800;
  padding: 4px 12px;
  border: 2px solid #000;
  box-shadow: 2px 2px 0px #000;
  margin-bottom: 24px;
  transform: rotate(-1.5deg);
  text-transform: uppercase;
}

/* 大字标题拼贴块 (图1的 DIGITAL ALCHEMIST 风格) */
.hero-title-avant {
  font-family: var(--font-display);
  font-size: clamp(2.8rem, 5.5vw, 4.8rem);
  font-weight: 900;
  line-height: 1.05;
  letter-spacing: -1.5px;
  margin-bottom: 20px;
  text-transform: uppercase;
}
.hero-title-avant .title-row-1 {
  display: block;
  font-weight: 900;
  color: #000;
}
.hero-title-avant .color-tiles {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 2px;
  margin: 6px 0;
}
.tile-block {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 2px 10px;
  color: #fff;
  font-weight: 900;
  border: 2px solid #000;
  box-shadow: 2px 2px 0 #000;
}
.tile-pink { background: var(--c-pink); }
.tile-orange { background: var(--c-orange); }
.tile-cyan { background: var(--c-cyan); }
.tile-lime { background: #b4df00; color: #000; }
.hero-title-avant .title-outline {
  display: block;
  color: transparent;
  -webkit-text-stroke: 2px #000;
  position: relative;
}
.hero-title-avant .title-underline-bar {
  display: block;
  width: 100%;
  height: 6px;
  background: #94af00;
  border: 2px solid #000;
  margin-top: 10px;
}

.hero-description {
  font-size: 1.15rem;
  color: var(--text-muted);
  max-width: 580px;
  margin-bottom: 30px;
  line-height: 1.7;
}
.hero-description strong {
  color: #000;
  background: rgba(212, 255, 0, 0.4);
  padding: 0 4px;
}

.hero-cta-group {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
  margin-bottom: 36px;
}
.btn-large-primary {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  font-weight: 800;
  padding: 14px 28px;
  background: var(--c-pink);
  color: #fff;
  border: 3px solid #000;
  box-shadow: var(--shadow-neo-lg);
  display: inline-flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  transition: all 0.2s ease;
}
.btn-large-primary:hover {
  transform: translate(-3px, -3px);
  box-shadow: 11px 11px 0 #000;
  background: #ff1a8c;
}
.btn-large-outline {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  font-weight: 700;
  padding: 14px 24px;
  background: #fff;
  color: #000;
  border: 3px solid #000;
  box-shadow: var(--shadow-neo);
  transition: all 0.2s ease;
}
.btn-large-outline:hover {
  background: #f0f0f0;
  transform: translate(-2px, -2px);
  box-shadow: 6px 6px 0 #000;
}

/* 核心特性胶囊列表 */
.hero-badges-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.pill-badge {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  background: #fff;
  border: 1.5px solid #000;
  padding: 4px 10px;
  box-shadow: 2px 2px 0 #000;
}

/* 终端小黑板卡片 (参考图1右下角状态框) */
.hero-code-card {
  position: relative;
}
.terminal-window {
  background: #0d0f12;
  border: 3px solid #000;
  box-shadow: var(--shadow-neo-lg);
  color: #79f59f;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  padding: 0;
  border-radius: var(--radius-sm);
  overflow: hidden;
  position: relative;
  transform: rotate(1deg);
  transition: transform 0.3s ease;
}
.terminal-window:hover {
  transform: rotate(0deg) scale(1.01);
}
.terminal-header {
  background: #1c2027;
  padding: 8px 12px;
  border-bottom: 2px solid #000;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.terminal-dots {
  display: flex;
  gap: 6px;
}
.terminal-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  border: 1px solid #000;
}
.terminal-dot.red { background: #ff5f56; }
.terminal-dot.yellow { background: #ffbd2e; }
.terminal-dot.green { background: #27c93f; }
.terminal-title {
  color: #8b949e;
  font-size: 0.75rem;
}
.terminal-body {
  padding: 20px;
  line-height: 1.7;
}
.terminal-comment { color: #6e7681; }
.terminal-var { color: #ff7b72; }
.terminal-func { color: #d2a8ff; }
.terminal-val { color: #79c0ff; }
.terminal-highlight {
  color: var(--c-lime);
  background: rgba(212, 255, 0, 0.1);
  padding: 2px 6px;
  border-left: 2px solid var(--c-lime);
  margin: 6px 0;
  display: block;
}

/* 小黄便利贴微动效 */
.sticky-note {
  position: absolute;
  bottom: -25px;
  left: -20px;
  background: var(--c-lime);
  color: #000;
  border: 2px solid #000;
  box-shadow: var(--shadow-neo);
  padding: 8px 14px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 800;
  transform: rotate(-4deg);
  z-index: 2;
}

/* SECTION通用头部 */
.section-head {
  margin-bottom: 48px;
  position: relative;
}
.section-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 800;
  background: #000;
  color: #fff;
  padding: 4px 12px;
  margin-bottom: 12px;
  box-shadow: 2px 2px 0 var(--c-cyan);
}
.section-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 3.5vw, 2.8rem);
  font-weight: 900;
  letter-spacing: -0.5px;
  line-height: 1.2;
}
.section-desc {
  color: var(--text-muted);
  font-size: 1.05rem;
  margin-top: 10px;
  max-width: 650px;
}

/* 核心优势模块 (网格卡片) */
.features-section {
  padding: 80px 0;
  border-top: 2px dashed #000;
}
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.feature-box {
  background: #fff;
  border: 3px solid #000;
  box-shadow: var(--shadow-neo);
  padding: 30px 24px;
  position: relative;
  transition: all 0.2s ease;
}
.feature-box:hover {
  transform: translate(-3px, -3px);
  box-shadow: var(--shadow-neo-lg);
}
.feature-icon-badge {
  width: 52px;
  height: 52px;
  background: #000;
  color: #fff;
  border: 2px solid #000;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  margin-bottom: 20px;
  box-shadow: 3px 3px 0 var(--c-pink);
}
.feature-box:nth-child(2) .feature-icon-badge { box-shadow: 3px 3px 0 var(--c-orange); }
.feature-box:nth-child(3) .feature-icon-badge { box-shadow: 3px 3px 0 var(--c-cyan); }
.feature-box:nth-child(4) .feature-icon-badge { box-shadow: 3px 3px 0 var(--c-lime); }
.feature-box:nth-child(5) .feature-icon-badge { box-shadow: 3px 3px 0 var(--c-purple); }
.feature-box:nth-child(6) .feature-icon-badge { box-shadow: 3px 3px 0 var(--c-pink); }

.feature-title {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 800;
  margin-bottom: 12px;
}
.feature-text {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.65;
}

/* ==========================================================================
   套餐 PRICING SECTION - 严格按照图2设计与内容还原
   ========================================================================== */
.pricing-section {
  padding: 90px 0;
  background: rgba(255, 255, 255, 0.65);
  border-top: 2px solid #000;
  border-bottom: 2px solid #000;
}
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  align-items: stretch;
}

/* 图2的套餐卡片基础结构 */
.pricing-card {
  background: #ffffff;
  border: 3px solid #000;
  box-shadow: var(--shadow-neo-lg);
  padding: 36px 30px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}
.pricing-card:hover {
  transform: translateY(-6px);
  box-shadow: 10px 10px 0 #000;
}

/* 图2中的套餐二特别高亮：深墨绿色背景与浅色文本 */
.pricing-card.card-featured {
  background: var(--c-green-dark);
  color: #ffffff;
  border: 3px solid #000;
  transform: translateY(-8px);
}
.pricing-card.card-featured:hover {
  transform: translateY(-12px);
  box-shadow: 12px 12px 0 #000;
}

/* 推荐小贴纸 */
.pricing-ribbon {
  position: absolute;
  top: -14px;
  right: 20px;
  background: var(--c-lime);
  color: #000;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 800;
  padding: 4px 10px;
  border: 2px solid #000;
  box-shadow: 2px 2px 0 #000;
  text-transform: uppercase;
}

.plan-header {
  margin-bottom: 24px;
}
.plan-name {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 900;
  letter-spacing: -0.5px;
  margin-bottom: 20px;
  color: #1e3a2f; /* 套餐一/三标题色 */
}
.pricing-card.card-featured .plan-name {
  color: #ffffff;
}

.plan-subtitle {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-muted);
  line-height: 1.5;
  margin-bottom: 8px;
}
.pricing-card.card-featured .plan-subtitle {
  color: #cfdad4;
}

.plan-specs {
  font-size: 0.95rem;
  color: var(--text-muted);
  margin-bottom: 24px;
  line-height: 1.5;
}
.pricing-card.card-featured .plan-specs {
  color: #e2ece7;
}

/* 特性列表 (图2还原) */
.plan-features-list {
  list-style: none;
  margin-bottom: 24px;
  border-top: 1px dashed rgba(0, 0, 0, 0.15);
  border-bottom: 1px dashed rgba(0, 0, 0, 0.15);
  padding: 18px 0;
}
.pricing-card.card-featured .plan-features-list {
  border-color: rgba(255, 255, 255, 0.2);
}
.plan-features-list li {
  font-size: 0.92rem;
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 10px;
  line-height: 1.4;
  color: #2b303a;
}
.pricing-card.card-featured .plan-features-list li {
  color: #e5ede9;
}
.plan-features-list li:last-child {
  margin-bottom: 0;
}
.plan-icon {
  font-size: 1.1rem;
  flex-shrink: 0;
}

/* 可选周期 (图2还原) */
.plan-cycles {
  font-size: 0.86rem;
  color: #6c757d;
  margin-bottom: 30px;
  font-family: var(--font-body);
}
.pricing-card.card-featured .plan-cycles {
  color: #a4b8af;
}

/* 价格展示 (图2还原) */
.plan-price-box {
  margin-bottom: 16px;
  display: flex;
  align-items: baseline;
  gap: 6px;
}
.price-currency {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 800;
  color: #1e3a2f;
}
.pricing-card.card-featured .price-currency {
  color: #2ee69c;
}
.price-amount {
  font-family: var(--font-display);
  font-size: 2.8rem;
  font-weight: 900;
  letter-spacing: -1px;
  line-height: 1;
  color: #1e3a2f;
}
.pricing-card.card-featured .price-amount {
  color: #2ee69c;
}
.price-unit {
  font-size: 0.88rem;
  color: #6c757d;
}
.pricing-card.card-featured .price-unit {
  color: #9ebdb1;
}

/* 底部关键参数 */
.plan-meta-stats {
  font-size: 0.85rem;
  color: #555;
  margin-bottom: 24px;
  line-height: 1.6;
}
.pricing-card.card-featured .plan-meta-stats {
  color: #c0d1c9;
}

/* 分隔线与注册按钮 (图2完全还原为绿字或绿底按钮) */
.pricing-card .plan-divider {
  width: 100%;
  height: 1px;
  background: #000;
  opacity: 0.2;
  margin-bottom: 18px;
}
.pricing-card.card-featured .plan-divider {
  background: #fff;
  opacity: 0.25;
}

.btn-plan-action {
  display: block;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 800;
  padding: 12px 20px;
  border: 2px solid #1e3a2f;
  color: #1e3a2f;
  background: transparent;
  transition: all 0.2s ease;
  letter-spacing: 0.5px;
}
.btn-plan-action:hover {
  background: #1e3a2f;
  color: #fff;
  box-shadow: 4px 4px 0 #000;
}

.pricing-card.card-featured .btn-plan-action {
  border-color: #2ee69c;
  color: #2ee69c;
  background: transparent;
}
.pricing-card.card-featured .btn-plan-action:hover {
  background: #2ee69c;
  color: #0b1f17;
  box-shadow: 4px 4px 0 #000;
}

/* ==========================================================================
   知识库/文章列表模块 (SEO & 内部跳转)
   ========================================================================== */
.kb-section {
  padding: 85px 0;
  position: relative;
}
.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}
.article-card {
  background: #fff;
  border: 3px solid #000;
  box-shadow: var(--shadow-neo);
  padding: 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all 0.2s ease;
  position: relative;
}
.article-card:hover {
  transform: translate(-3px, -3px);
  box-shadow: var(--shadow-neo-lg);
}
.article-card-header {
  margin-bottom: 16px;
}
.article-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 800;
  background: var(--c-cyan);
  color: #000;
  padding: 2px 8px;
  border: 1.5px solid #000;
  margin-bottom: 12px;
}
.article-card:nth-child(2) .article-tag { background: var(--c-lime); }
.article-card:nth-child(3) .article-tag { background: var(--c-pink); color: #fff; }
.article-card:nth-child(4) .article-tag { background: var(--c-orange); color: #fff; }
.article-card:nth-child(5) .article-tag { background: #d2a8ff; }
.article-card:nth-child(6) .article-tag { background: var(--c-cyan); }
.article-card:nth-child(7) .article-tag { background: var(--c-lime); }
.article-card:nth-child(8) .article-tag { background: var(--c-pink); color: #fff; }
.article-card:nth-child(9) .article-tag { background: var(--c-orange); color: #fff; }

.article-card-title {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 800;
  line-height: 1.4;
  margin-bottom: 12px;
}
.article-card-title a {
  color: #000;
}
.article-card-title a:hover {
  text-decoration: underline;
  color: var(--c-purple);
}
.article-excerpt {
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.6;
  margin-bottom: 18px;
}
.article-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid #e0e0e0;
  padding-top: 14px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-light);
}
.article-read-link {
  font-weight: 800;
  color: #000;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}
.article-read-link:hover {
  color: var(--c-pink);
}

/* ==========================================================================
   常见问题 FAQ 折叠模块
   ========================================================================== */
.faq-section {
  padding: 85px 0;
  border-top: 2px dashed #000;
}
.faq-accordion {
  max-width: 900px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.faq-item {
  background: #fff;
  border: 2px solid #000;
  box-shadow: var(--shadow-neo-sm);
  transition: all 0.2s ease;
}
.faq-item.active {
  box-shadow: var(--shadow-neo);
}
.faq-question {
  width: 100%;
  padding: 18px 24px;
  text-align: left;
  background: transparent;
  border: none;
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 800;
  color: #000;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.faq-toggle-icon {
  font-family: var(--font-mono);
  font-size: 1.4rem;
  font-weight: 800;
  transition: transform 0.2s ease;
}
.faq-item.active .faq-toggle-icon {
  transform: rotate(45deg);
}
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
  padding: 0 24px;
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.7;
}
.faq-item.active .faq-answer {
  max-height: 400px;
  padding: 0 24px 20px 24px;
  border-top: 1px dashed #ddd;
}

/* ==========================================================================
   文章详情页排版规范 (专门为9篇深度长文定制，SEO友好)
   ========================================================================== */
.article-page-header {
  padding: 50px 0 30px;
  border-bottom: 2px solid #000;
  background: #fff;
}
.breadcrumb-nav {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 20px;
}
.breadcrumb-nav a {
  color: #000;
  text-decoration: underline;
}
.article-main-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 3.8vw, 2.9rem);
  font-weight: 900;
  line-height: 1.25;
  margin-bottom: 18px;
}
.article-meta-info {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 18px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-muted);
}
.article-meta-badge {
  background: #000;
  color: #fff;
  padding: 2px 8px;
  font-weight: 700;
}

.article-content-wrapper {
  padding: 50px 0 80px;
}
.article-layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 40px;
  align-items: start;
}
.article-sidebar {
  position: sticky;
  top: 100px;
}
.sidebar-box {
  background: #fff;
  border: 2px solid #000;
  box-shadow: var(--shadow-neo);
  padding: 20px;
  margin-bottom: 24px;
}
.sidebar-title {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  font-weight: 800;
  border-bottom: 2px solid #000;
  padding-bottom: 8px;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.toc-list {
  list-style: none;
  font-size: 0.88rem;
  line-height: 1.8;
}
.toc-list a {
  color: var(--text-muted);
  transition: color 0.15s ease;
  display: block;
}
.toc-list a:hover {
  color: #000;
  font-weight: 700;
  padding-left: 4px;
}
.sidebar-cta-btn {
  display: block;
  text-align: center;
  background: var(--c-lime);
  color: #000;
  font-family: var(--font-mono);
  font-size: 0.95rem;
  font-weight: 800;
  padding: 12px;
  border: 2px solid #000;
  box-shadow: var(--shadow-neo-sm);
  margin-top: 14px;
}
.sidebar-cta-btn:hover {
  background: #e2ff40;
  transform: translate(-1px, -1px);
}

.article-body {
  background: #fff;
  border: 3px solid #000;
  box-shadow: var(--shadow-neo);
  padding: 44px 50px;
  font-size: 1.05rem;
  line-height: 1.85;
  color: #1a1a1a;
}
.article-body h2 {
  font-family: var(--font-display);
  font-size: 1.8rem;
  font-weight: 800;
  margin: 40px 0 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid #000;
  display: flex;
  align-items: center;
  gap: 10px;
}
.article-body h2::before {
  content: "#";
  color: var(--c-pink);
  font-family: var(--font-mono);
}
.article-body h3 {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 800;
  margin: 28px 0 12px;
  color: #111;
}
.article-body p {
  margin-bottom: 20px;
}
.article-body ul, .article-body ol {
  margin: 16px 0 24px 28px;
}
.article-body li {
  margin-bottom: 8px;
}
.article-body blockquote {
  background: #f7f7f4;
  border-left: 5px solid #000;
  padding: 16px 20px;
  margin: 24px 0;
  font-size: 0.98rem;
  color: #444;
}
.article-body strong {
  color: #000;
  font-weight: 700;
}
.article-body .keyword-highlight {
  background: rgba(255, 235, 59, 0.4);
  padding: 1px 4px;
  border-bottom: 1.5px solid #ff9800;
  font-weight: 600;
}
.article-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  font-size: 0.92rem;
}
.article-body th, .article-body td {
  border: 1px solid #000;
  padding: 12px 14px;
  text-align: left;
}
.article-body th {
  background: #000;
  color: #fff;
  font-family: var(--font-mono);
  font-weight: 700;
}
.article-body tr:nth-child(even) td {
  background: #fafaf7;
}

/* 内部跳转内链盒子 */
.internal-link-card {
  background: #fdfae5;
  border: 2px solid #000;
  padding: 16px 20px;
  margin: 28px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  box-shadow: var(--shadow-neo-sm);
}
.internal-link-card strong {
  display: block;
  font-size: 0.95rem;
  margin-bottom: 4px;
}
.internal-link-card a {
  color: #000;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 800;
  text-decoration: underline;
  white-space: nowrap;
}

/* 用户真实评价区 (文章末尾) */
.article-reviews-section {
  margin-top: 50px;
  padding-top: 40px;
  border-top: 2px dashed #000;
}
.review-block-title {
  font-family: var(--font-display);
  font-size: 1.45rem;
  font-weight: 900;
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.reviews-list {
  display: flex;
  flex-direction: column;
  gap: 18px;
}
.review-item {
  background: #fafaf8;
  border: 2px solid #000;
  padding: 20px;
  box-shadow: 2px 2px 0 #000;
}
.review-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
}
.review-user-info {
  display: flex;
  align-items: center;
  gap: 10px;
}
.review-avatar {
  width: 40px;
  height: 40px;
  background: #000;
  color: #fff;
  font-weight: 800;
  font-family: var(--font-mono);
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid #000;
}
.review-name {
  font-weight: 800;
  font-size: 0.95rem;
}
.review-role {
  font-size: 0.78rem;
  color: var(--text-light);
  font-family: var(--font-mono);
}
.review-stars {
  color: #ff9900;
  letter-spacing: 2px;
  font-size: 0.95rem;
}
.review-text {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* 相关文章推荐网状链接 */
.related-articles-section {
  margin-top: 50px;
  padding-top: 40px;
  border-top: 2px dashed #000;
}
.related-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
  margin-top: 20px;
}
.related-card {
  background: #fff;
  border: 2px solid #000;
  padding: 16px 20px;
  box-shadow: 2px 2px 0 #000;
  transition: all 0.2s ease;
}
.related-card:hover {
  transform: translate(-2px, -2px);
  box-shadow: 4px 4px 0 #000;
}
.related-card a {
  font-weight: 700;
  font-size: 0.95rem;
  display: block;
}

/* ==========================================================================
   底部 CTA 横幅 (实验风强转换区)
   ========================================================================== */
.footer-cta-banner {
  background: #000;
  color: #fff;
  padding: 60px 0;
  border-top: 3px solid #000;
  position: relative;
  overflow: hidden;
}
.cta-banner-inner {
  text-align: center;
  position: relative;
  z-index: 2;
  max-width: 800px;
  margin: 0 auto;
}
.cta-tag {
  background: var(--c-lime);
  color: #000;
  font-family: var(--font-mono);
  font-weight: 900;
  font-size: 0.85rem;
  padding: 4px 14px;
  display: inline-block;
  margin-bottom: 20px;
  transform: rotate(-1deg);
}
.cta-title {
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 4vw, 3.2rem);
  font-weight: 900;
  line-height: 1.15;
  margin-bottom: 16px;
}
.cta-title span.lime { color: var(--c-lime); }
.cta-desc {
  font-size: 1.1rem;
  color: #a0aec0;
  margin-bottom: 30px;
}

/* 官方页脚 Footer */
.site-footer {
  background: #0d0f12;
  color: #9ca3af;
  padding: 50px 0 30px;
  border-top: 2px solid #222;
  font-size: 0.9rem;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}
.footer-brand-title {
  color: #fff;
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: 1.2rem;
  margin-bottom: 12px;
}
.footer-col-title {
  color: #fff;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.95rem;
  margin-bottom: 16px;
  border-bottom: 2px solid #333;
  padding-bottom: 6px;
}
.footer-links-list {
  list-style: none;
  line-height: 2;
}
.footer-links-list a {
  color: #9ca3af;
  transition: color 0.15s ease;
}
.footer-links-list a:hover {
  color: var(--c-lime);
  text-decoration: underline;
}
.footer-bottom {
  border-top: 1px solid #222;
  padding-top: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.8rem;
  font-family: var(--font-mono);
}
.footer-legal-tag {
  color: #6b7280;
}

/* 响应式断点适配 */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 50px;
  }
  .features-grid, .pricing-grid, .articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
  .article-layout {
    grid-template-columns: 1fr;
  }
  .article-sidebar {
    display: none;
  }
}

@media (max-width: 768px) {
  .nav-box {
    display: none;
  }
  .nav-box.mobile-open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 20px;
    right: 20px;
    background: #fff;
    z-index: 99;
  }
  .mobile-toggle {
    display: block;
  }
  .features-grid, .pricing-grid, .articles-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .article-body {
    padding: 24px 20px;
  }
  .related-grid {
    grid-template-columns: 1fr;
  }
}