/* ===================================================================
   99吧机场 (99vpn.homes) - 现代高雅纯白极简风格 CSS
   设计原则：干净、真实、克制、无过度修饰，纯白底色配微蓝高光
   =================================================================== */

:root {
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Courier New", monospace;

  /* 纯白轻奢质感底色 */
  --bg-primary: #FFFFFF;
  --bg-secondary: #F8FAFC;
  --bg-tertiary: #F1F5F9;
  --bg-card: #FFFFFF;

  --text-main: #0F172A;
  --text-sub: #334155;
  --text-muted: #64748B;
  --text-light: #94A3B8;

  --border-color: #E2E8F0;
  --border-light: #EDF2F7;
  --border-hover: #CBD5E1;

  /* 经典科技蓝 */
  --primary: #2563EB;
  --primary-hover: #1D4ED8;
  --primary-light: #EFF6FF;
  --primary-border: #BFDBFE;

  --accent-emerald: #10B981;
  --accent-amber: #D97706;

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(15, 23, 42, 0.06), 0 2px 4px -2px rgba(15, 23, 42, 0.04);
  --shadow-lg: 0 10px 15px -3px rgba(15, 23, 42, 0.07), 0 4px 6px -4px rgba(15, 23, 42, 0.03);
  --shadow-xl: 0 20px 25px -5px rgba(15, 23, 42, 0.08), 0 8px 10px -6px rgba(15, 23, 42, 0.04);

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 9999px;

  --transition-fast: all 0.15s ease-out;
  --transition-normal: all 0.25s ease-out;
}

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

html {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-main);
  line-height: 1.6;
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
  -webkit-font-smoothing: antialiased;
}

body {
  position: relative;
  overflow-x: hidden;
  background: var(--bg-primary);
}

/* 极简动态背景 Canvas */
#dynamic-bg-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -2;
  pointer-events: none;
  opacity: 0.7;
}

.ambient-glow {
  position: fixed;
  width: 500px;
  height: 500px;
  border-radius: 50%;
  filter: blur(100px);
  pointer-events: none;
  z-index: -3;
  opacity: 0.35;
}

.glow-top-right {
  top: -100px;
  right: -50px;
  background: radial-gradient(circle, rgba(59, 130, 246, 0.3) 0%, transparent 70%);
}

.glow-mid-left {
  top: 45%;
  left: -150px;
  background: radial-gradient(circle, rgba(99, 102, 241, 0.2) 0%, transparent 70%);
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

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

/* 顶部轻量通知条 */
.top-notice-bar {
  background: #0F172A;
  color: #F8FAFC;
  font-size: 0.85rem;
  padding: 9px 16px;
  text-align: center;
  position: relative;
  z-index: 50;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 12px;
}

.top-notice-bar .badge {
  background: var(--primary);
  color: #FFF;
  padding: 2px 7px;
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 700;
}

.top-notice-bar a {
  color: #93C5FD;
  font-weight: 600;
  text-decoration: underline;
}

/* 导航栏 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  transition: var(--transition-normal);
}

.site-header.scrolled {
  box-shadow: var(--shadow-sm);
  background: rgba(255, 255, 255, 0.98);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-main);
  letter-spacing: -0.5px;
}

.brand-logo .logo-icon {
  width: 34px;
  height: 34px;
  background: var(--primary);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #FFFFFF;
  font-size: 0.95rem;
  font-weight: 900;
}

.brand-logo .brand-highlight {
  color: var(--primary);
}

.nav-links {
  display: flex;
  align-items: center;
  list-style: none;
  gap: 26px;
}

.nav-links a {
  color: var(--text-sub);
  font-size: 0.92rem;
  font-weight: 500;
  transition: var(--transition-fast);
}

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

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

.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.4rem;
  color: var(--text-main);
  cursor: pointer;
}

/* 按钮设计 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  font-size: 0.92rem;
  font-weight: 600;
  padding: 9px 20px;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: var(--transition-fast);
  white-space: nowrap;
}

.btn-lg {
  padding: 12px 28px;
  font-size: 1rem;
}

.btn-sm {
  padding: 6px 14px;
  font-size: 0.85rem;
}

.btn-primary {
  background: var(--primary);
  color: #FFFFFF;
}

.btn-primary:hover {
  background: var(--primary-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
}

.btn-secondary {
  background: #FFFFFF;
  color: var(--text-main);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover {
  background: var(--bg-tertiary);
  border-color: var(--border-hover);
}

.btn-white {
  background: #FFFFFF;
  color: var(--primary);
  font-weight: 700;
}

.btn-white:hover {
  background: #F8FAFC;
}

/* 章节通用 */
.section {
  padding: 75px 0;
  position: relative;
}

.section-head {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 45px auto;
}

.section-badge {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--primary);
  background: var(--primary-light);
  border: 1px solid var(--primary-border);
  padding: 4px 12px;
  border-radius: var(--radius-full);
  margin-bottom: 12px;
}

.section-title {
  font-size: 2.1rem;
  font-weight: 800;
  line-height: 1.3;
  color: var(--text-main);
  margin-bottom: 12px;
  letter-spacing: -0.5px;
}

.section-subtitle {
  font-size: 1.05rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ===================================================================
   板块 1：Hero 顶部
   =================================================================== */
.hero-section {
  padding: 60px 0 70px 0;
  text-align: center;
  position: relative;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  padding: 5px 14px;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  color: var(--text-sub);
  margin-bottom: 22px;
  box-shadow: var(--shadow-sm);
}

.tag-status {
  background: #DCFCE7;
  color: #166534;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 2px 7px;
  border-radius: var(--radius-full);
}

.hero-title {
  font-size: 3rem;
  font-weight: 900;
  line-height: 1.25;
  letter-spacing: -1px;
  color: var(--text-main);
  margin-bottom: 20px;
}

.hero-title .highlight {
  color: var(--primary);
}

.hero-description {
  font-size: 1.15rem;
  color: var(--text-sub);
  max-width: 780px;
  margin: 0 auto 32px auto;
  line-height: 1.75;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 45px;
  flex-wrap: wrap;
}

/* 实测数据栏（非 AI 假大空大数字） */
.proof-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  max-width: 980px;
  margin: 0 auto;
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 20px 24px;
  box-shadow: var(--shadow-md);
  text-align: left;
}

.proof-item {
  border-right: 1px solid var(--border-light);
  padding-right: 14px;
}

.proof-item:last-child {
  border-right: none;
  padding-right: 0;
}

.proof-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.proof-value {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--primary);
  line-height: 1.2;
}

.proof-unit {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-sub);
}

.proof-desc {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: 3px;
}

/* ===================================================================
   板块 3：节点延迟面板
   =================================================================== */
.node-status-card {
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.status-header {
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.status-header-info {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
}

.live-pill {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent-emerald);
}

.status-meta {
  font-size: 0.82rem;
  color: var(--text-muted);
}

.node-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(270px, 1fr));
  gap: 16px;
  padding: 24px;
}

.node-item {
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 16px 18px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: var(--transition-fast);
}

.node-item:hover {
  border-color: var(--primary-border);
  box-shadow: var(--shadow-sm);
}

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

.node-name {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-main);
}

.node-tag {
  font-size: 0.72rem;
  padding: 2px 6px;
  border-radius: 4px;
  font-weight: 600;
  background: var(--primary-light);
  color: var(--primary);
}

.node-ping-display {
  display: flex;
  align-items: baseline;
  gap: 6px;
}

.node-ping-value {
  font-family: var(--font-mono);
  font-size: 1.3rem;
  font-weight: 800;
}

.node-ping-unit {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.node-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 8px;
  border-top: 1px dashed var(--border-light);
  font-size: 0.78rem;
  color: var(--text-muted);
}

.node-tags-list {
  display: flex;
  gap: 5px;
}

.node-tags-list span {
  background: var(--bg-tertiary);
  color: var(--text-sub);
  padding: 2px 5px;
  border-radius: 3px;
  font-size: 0.7rem;
}

/* ===================================================================
   板块 4：套餐价格
   =================================================================== */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.pricing-card {
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px 26px;
  position: relative;
  display: flex;
  flex-direction: column;
  transition: var(--transition-fast);
  box-shadow: var(--shadow-sm);
}

.pricing-card:hover {
  border-color: var(--primary-border);
  box-shadow: var(--shadow-md);
}

.pricing-card.featured {
  border: 2px solid var(--primary);
  box-shadow: 0 8px 24px rgba(37, 99, 235, 0.12);
}

.pricing-ribbon {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--primary);
  color: #FFFFFF;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 3px 14px;
  border-radius: var(--radius-full);
}

.plan-header {
  margin-bottom: 20px;
}

.plan-title {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 4px;
}

.plan-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.plan-price-wrap {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 22px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--border-light);
}

.price-currency {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
}

.price-number {
  font-size: 3rem;
  font-weight: 900;
  color: var(--text-main);
  line-height: 1;
}

.price-period {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.plan-features-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 28px;
  flex-grow: 1;
  font-size: 0.9rem;
  color: var(--text-sub);
}

.pricing-card .btn {
  width: 100%;
}

/* ===================================================================
   痛点解决板块（取代原 AI 的六大优势）
   =================================================================== */
.pain-solution-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 22px;
}

.pain-card {
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px 22px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  box-shadow: var(--shadow-sm);
}

.pain-header {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.pain-tag {
  font-size: 0.75rem;
  font-weight: 700;
  color: #DC2626;
  background: #FEE2E2;
  padding: 2px 8px;
  border-radius: 4px;
  width: fit-content;
}

.pain-header h3 {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--text-main);
}

.pain-reason {
  font-size: 0.88rem;
  color: var(--text-sub);
  line-height: 1.6;
}

.solution-box {
  background: var(--primary-light);
  border-left: 3px solid var(--primary);
  padding: 12px 14px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: 0.88rem;
  color: var(--text-main);
  line-height: 1.6;
}

.sol-tag {
  display: block;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 4px;
}

/* ===================================================================
   板块 5：常见问题 (FAQ)
   =================================================================== */
.faq-wrap {
  max-width: 820px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.faq-item {
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.faq-question {
  width: 100%;
  padding: 18px 22px;
  background: none;
  border: none;
  text-align: left;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-main);
  gap: 12px;
}

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

.faq-item.active .faq-icon-arrow {
  transform: rotate(180deg);
  color: var(--primary);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
  padding: 0 22px;
  color: var(--text-sub);
  font-size: 0.92rem;
  line-height: 1.65;
}

.faq-answer ul {
  margin: 8px 0 8px 18px;
}

.faq-answer li {
  margin-bottom: 4px;
}

.faq-item.active .faq-answer {
  max-height: 400px;
  padding-bottom: 18px;
}

/* ===================================================================
   板块 5（续）：知识库
   =================================================================== */
.kb-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.kb-card {
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 22px 20px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: var(--shadow-sm);
  transition: var(--transition-fast);
}

.kb-card:hover {
  border-color: var(--primary-border);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.kb-tag {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--primary);
  background: var(--primary-light);
  padding: 2px 8px;
  border-radius: 4px;
  margin-bottom: 10px;
}

.kb-card h3 {
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 8px;
  line-height: 1.4;
}

.kb-card p {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.55;
  margin-bottom: 16px;
  flex-grow: 1;
}

.kb-link {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--primary);
}

.kb-link:hover {
  text-decoration: underline;
}

/* ===================================================================
   板块 6：真实评价
   =================================================================== */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.testi-card {
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 22px 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  box-shadow: var(--shadow-sm);
}

.testi-user-row {
  display: flex;
  align-items: center;
  gap: 10px;
}

.testi-avatar {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: var(--bg-tertiary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: var(--primary);
  font-size: 0.95rem;
}

.testi-name {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--text-main);
}

.testi-role {
  font-size: 0.76rem;
  color: var(--text-muted);
}

.testi-text {
  font-size: 0.88rem;
  color: var(--text-sub);
  line-height: 1.65;
}

/* 底部 CTA */
.cta-banner {
  background: #0F172A;
  border-radius: var(--radius-lg);
  padding: 48px 32px;
  text-align: center;
  color: #FFFFFF;
  margin-top: 30px;
}

.cta-banner h2 {
  font-size: 1.9rem;
  font-weight: 800;
  margin-bottom: 10px;
}

.cta-banner p {
  font-size: 1rem;
  color: #94A3B8;
  max-width: 600px;
  margin: 0 auto 24px auto;
}

/* 页脚 Footer */
.site-footer {
  background: #F8FAFC;
  border-top: 1px solid var(--border-color);
  padding: 50px 0 25px 0;
  font-size: 0.88rem;
  color: var(--text-muted);
}

.footer-top {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 36px;
  margin-bottom: 36px;
}

.footer-col h4 {
  color: var(--text-main);
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 14px;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 9px;
}

.footer-links a {
  color: var(--text-sub);
}

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

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 20px;
  border-top: 1px solid var(--border-color);
  flex-wrap: wrap;
  gap: 12px;
}

.keyword-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 10px;
}

.keyword-chips span {
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  color: var(--text-sub);
  font-size: 0.72rem;
  padding: 2px 7px;
  border-radius: 4px;
}

/* 文章页面样式保持高质感极简 */
.article-header {
  padding: 50px 0 32px 0;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
}

.breadcrumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.breadcrumbs a {
  color: var(--primary);
}

.article-title {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--text-main);
  line-height: 1.3;
  margin-bottom: 12px;
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.article-layout {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 36px;
  padding: 40px 0;
}

.article-body {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--text-sub);
}

.article-body h2 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-main);
  margin: 36px 0 14px 0;
  padding-bottom: 6px;
  border-bottom: 2px solid var(--primary-light);
}

.article-body h3 {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-main);
  margin: 24px 0 10px 0;
}

.article-body p {
  margin-bottom: 18px;
}

.article-body ul, .article-body ol {
  margin: 0 0 20px 22px;
}

.article-body li {
  margin-bottom: 6px;
}

.article-body blockquote {
  border-left: 3px solid var(--primary);
  background: var(--primary-light);
  padding: 14px 18px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 20px 0;
  color: var(--text-main);
}

.article-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  background: #FFFFFF;
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.article-body th, .article-body td {
  padding: 10px 14px;
  border: 1px solid var(--border-color);
  text-align: left;
  font-size: 0.88rem;
}

.article-body th {
  background: var(--bg-tertiary);
  font-weight: 700;
  color: var(--text-main);
}

.sidebar-sticky {
  position: sticky;
  top: 90px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.sidebar-box {
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 20px;
  box-shadow: var(--shadow-sm);
}

.sidebar-box h4 {
  font-size: 0.98rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 12px;
  border-bottom: 1px solid var(--border-light);
  padding-bottom: 8px;
}

.sidebar-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.sidebar-links a {
  font-size: 0.88rem;
  color: var(--text-sub);
}

.sidebar-links a:hover {
  color: var(--primary);
}

/* 响应式断点 */
@media (max-width: 1024px) {
  .hero-title { font-size: 2.5rem; }
  .proof-bar { grid-template-columns: repeat(2, 1fr); gap: 14px; }
  .pricing-grid { grid-template-columns: 1fr; max-width: 420px; margin: 0 auto; }
  .pain-solution-grid { grid-template-columns: 1fr; }
  .kb-grid { grid-template-columns: repeat(2, 1fr); }
  .testimonials-grid { grid-template-columns: 1fr; }
  .footer-top { grid-template-columns: 1fr 1fr; }
  .article-layout { grid-template-columns: 1fr; }
  .sidebar-sticky { position: static; }
}

@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-links.mobile-open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 68px;
    left: 0;
    width: 100%;
    background: #FFFFFF;
    border-bottom: 1px solid var(--border-color);
    padding: 20px;
    box-shadow: var(--shadow-md);
    gap: 14px;
  }
  .mobile-menu-toggle { display: block; }
  .hero-title { font-size: 2rem; }
  .hero-description { font-size: 1rem; }
  .proof-bar { grid-template-columns: 1fr; }
  .proof-item { border-right: none; border-bottom: 1px solid var(--border-light); padding-bottom: 10px; }
  .proof-item:last-child { border-bottom: none; }
  .kb-grid { grid-template-columns: 1fr; }
  .footer-top { grid-template-columns: 1fr; }
}