/* ==========================================================================
   青云梯 (qingyuntijc.cyou) - 官方主样式表
   主题：浅青晶澜 · 极速专线 (Light Cyan Crystal Azure Theme)
   视觉特性：明亮清新的浅青色底蕴 + 晶润白玉毛玻璃卡片 + 现代微交互与全端自适应
   ========================================================================== */

:root {
  /* 浅青色核心色彩 */
  --bg-page: #ecf8f9;
  --bg-page-alt: #e0f4f6;
  --bg-card: rgba(255, 255, 255, 0.94);
  --bg-card-hover: #ffffff;
  --bg-glass: rgba(255, 255, 255, 0.85);
  --bg-subtle: rgba(8, 145, 178, 0.08);

  /* 边框与微光 */
  --border-color: rgba(8, 145, 178, 0.18);
  --border-focus: rgba(8, 145, 178, 0.55);
  --border-light: rgba(207, 237, 240, 0.7);

  /* 主色调：活力浅青、深青与碧蓝 */
  --primary: #0891b2;
  --primary-hover: #0e7490;
  --cyan-bright: #06b6d4;
  --cyan-light: #22d3ee;
  --cyan-soft: #cffafe;
  --accent: #0284c7;
  --amber: #f59e0b;
  --emerald: #10b981;

  /* 文字配色：深邃青墨色，提供高对比度极佳可读性 */
  --text-heading: #083344;
  --text-main: #164e63;
  --text-sub: #334155;
  --text-muted: #64748b;

  /* 浅青流光渐变 */
  --gradient-brand: linear-gradient(135deg, #0891b2 0%, #06b6d4 50%, #0284c7 100%);
  --gradient-pill: linear-gradient(135deg, rgba(8, 145, 178, 0.12) 0%, rgba(6, 182, 212, 0.16) 100%);
  --gradient-card: linear-gradient(180deg, rgba(255, 255, 255, 0.98) 0%, rgba(240, 252, 253, 0.92) 100%);

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;

  --shadow-card: 0 10px 30px -8px rgba(8, 145, 178, 0.12), 0 4px 14px rgba(15, 23, 42, 0.04);
  --shadow-hover: 0 18px 40px -10px rgba(8, 145, 178, 0.22), 0 8px 20px rgba(15, 23, 42, 0.06);
  --shadow-glow: 0 0 25px rgba(6, 182, 212, 0.28);
}

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

html {
  scroll-behavior: smooth;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background-color: var(--bg-page);
  color: var(--text-main);
  line-height: 1.6;
}

body {
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
  background-color: var(--bg-page);
  /* 专属浅青色视觉渐变，营造晶莹清透的空灵水青感 */
  background-image: 
    radial-gradient(circle at 10% 12%, rgba(34, 211, 238, 0.22) 0%, transparent 45%),
    radial-gradient(circle at 90% 25%, rgba(6, 182, 212, 0.16) 0%, transparent 40%),
    radial-gradient(circle at 50% 65%, rgba(8, 145, 178, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 20% 88%, rgba(34, 211, 238, 0.18) 0%, transparent 45%),
    linear-gradient(180deg, #ecf8f9 0%, #f4fafb 30%, #e2f5f7 70%, #ecf8f9 100%);
  background-attachment: fixed;
  color: var(--text-main);
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: all 0.25s ease;
}

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

.container {
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */
.header-nav {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(236, 248, 249, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  box-shadow: 0 4px 16px rgba(8, 145, 178, 0.05);
  transition: all 0.3s ease;
}

.nav-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
}

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

.logo-img {
  width: 42px;
  height: 42px;
  border-radius: var(--radius-sm);
  filter: drop-shadow(0 2px 8px rgba(8, 145, 178, 0.25));
}

.logo-text {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-heading);
  letter-spacing: -0.5px;
}

.logo-badge {
  font-size: 0.72rem;
  padding: 3px 8px;
  border-radius: 9999px;
  background: var(--gradient-pill);
  color: var(--primary);
  border: 1px solid var(--border-color);
  font-weight: 700;
}

.nav-links {
  display: flex;
  align-items: center;
  list-style: none;
  gap: 30px;
}

.nav-links a {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-main);
  padding: 6px 4px;
  position: relative;
}

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

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 2px;
  background: var(--primary);
  transition: width 0.25s ease;
}

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

.mobile-menu-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-heading);
  font-size: 1.5rem;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  cursor: pointer;
}

/* Mobile Nav Drawer */
.mobile-nav-drawer {
  display: none;
  position: fixed;
  top: 76px;
  left: 0;
  width: 100%;
  background: rgba(236, 248, 249, 0.98);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
  padding: 24px;
  z-index: 999;
  box-shadow: 0 16px 30px rgba(8, 145, 178, 0.12);
}

.mobile-nav-drawer.active {
  display: block;
}

.mobile-nav-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.mobile-nav-links a {
  display: block;
  padding: 10px 14px;
  font-weight: 600;
  color: var(--text-heading);
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.6);
}

/* ==========================================================================
   Buttons & CTAs
   ========================================================================== */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  background: var(--gradient-brand);
  color: #ffffff !important;
  font-weight: 700;
  font-size: 0.98rem;
  border-radius: 9999px;
  box-shadow: 0 8px 20px -4px rgba(8, 145, 178, 0.35);
  border: none;
  cursor: pointer;
  transition: all 0.3s ease;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 26px -4px rgba(8, 145, 178, 0.45);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 26px;
  background: rgba(255, 255, 255, 0.9);
  color: var(--text-heading) !important;
  font-weight: 600;
  font-size: 0.98rem;
  border-radius: 9999px;
  border: 1px solid var(--border-color);
  box-shadow: 0 4px 12px rgba(8, 145, 178, 0.08);
  cursor: pointer;
  transition: all 0.25s ease;
}

.btn-secondary:hover {
  background: #ffffff;
  border-color: var(--primary);
  color: var(--primary) !important;
  transform: translateY(-2px);
}

/* ==========================================================================
   Hero Banner Section
   ========================================================================== */
.hero-section {
  padding: 160px 0 80px;
  text-align: center;
  position: relative;
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 22px;
  border-radius: 9999px;
  background: rgba(255, 255, 255, 0.85);
  border: 1px solid var(--border-color);
  color: var(--primary);
  font-size: 0.88rem;
  font-weight: 700;
  margin-bottom: 24px;
  box-shadow: 0 4px 14px rgba(8, 145, 178, 0.08);
}

.hero-title {
  font-size: 3.4rem;
  font-weight: 900;
  line-height: 1.25;
  color: var(--text-heading);
  letter-spacing: -1px;
  margin-bottom: 22px;
}

.text-gradient {
  background: linear-gradient(135deg, #0891b2 0%, #06b6d4 50%, #0284c7 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.2rem;
  color: var(--text-sub);
  max-width: 820px;
  margin: 0 auto 36px;
  line-height: 1.7;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 50px;
}

/* Metrics Row */
.metrics-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 30px;
}

.metric-box {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px 18px;
  box-shadow: var(--shadow-card);
  transition: all 0.3s ease;
}

.metric-box:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: var(--cyan-bright);
}

.metric-num {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--primary);
  margin-bottom: 6px;
  font-variant-numeric: tabular-nums;
}

.metric-label {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-sub);
}

/* ==========================================================================
   Section Headers
   ========================================================================== */
.section-padding {
  padding: 90px 0;
}

.section-header {
  text-align: center;
  max-width: 780px;
  margin: 0 auto 50px;
}

.section-tag {
  display: inline-block;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--primary);
  background: rgba(255, 255, 255, 0.8);
  border: 1px solid var(--border-color);
  padding: 6px 16px;
  border-radius: 9999px;
  margin-bottom: 12px;
}

.section-title {
  font-size: 2.3rem;
  font-weight: 800;
  color: var(--text-heading);
  margin-bottom: 14px;
  line-height: 1.3;
}

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

/* ==========================================================================
   Interactive Protocol & Routing Mode (全新模式展示区)
   ========================================================================== */
.protocols-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 30px;
}

.protocol-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px 26px;
  box-shadow: var(--shadow-card);
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.protocol-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
  border-color: var(--primary);
}

.protocol-badge {
  position: absolute;
  top: 20px;
  right: 20px;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 9999px;
  background: var(--cyan-soft);
  color: var(--primary);
}

.protocol-icon {
  font-size: 2.4rem;
  margin-bottom: 16px;
}

.protocol-card h3 {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-heading);
  margin-bottom: 10px;
}

.protocol-card p {
  font-size: 0.94rem;
  color: var(--text-sub);
  line-height: 1.6;
}

/* ==========================================================================
   Real-time Latency Monitor
   ========================================================================== */
.ping-card-wrapper {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 36px;
  box-shadow: var(--shadow-card);
  max-width: 980px;
  margin: 0 auto;
}

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

.ping-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 22px;
  background: rgba(240, 252, 253, 0.7);
  border: 1px solid rgba(8, 145, 178, 0.15);
  border-radius: var(--radius-md);
  transition: all 0.25s ease;
}

.ping-item:hover {
  background: #ffffff;
  border-color: var(--primary);
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(8, 145, 178, 0.1);
}

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

.ping-flag {
  font-size: 1.9rem;
}

.ping-name {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-heading);
}

.ping-detail {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.ping-badge {
  text-align: right;
  min-width: 80px;
}

.ping-val {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--emerald);
  font-variant-numeric: tabular-nums;
}

.ping-bar-bg {
  width: 100%;
  height: 5px;
  background: #e2e8f0;
  border-radius: 9999px;
  margin-top: 6px;
  overflow: hidden;
}

.ping-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, #10b981, #06b6d4);
  border-radius: 9999px;
}

/* ==========================================================================
   Bento Advantages Grid
   ========================================================================== */
.bento-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.bento-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 34px 28px;
  box-shadow: var(--shadow-card);
  transition: all 0.3s ease;
}

.bento-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
  border-color: var(--cyan-bright);
}

.bento-card.span-2 {
  grid-column: span 2;
}

.bento-icon {
  font-size: 2.2rem;
  margin-bottom: 16px;
}

.bento-card h3 {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--text-heading);
  margin-bottom: 12px;
}

.bento-card p {
  color: var(--text-sub);
  font-size: 0.95rem;
  line-height: 1.65;
}

/* ==========================================================================
   Pricing Cards Matrix
   ========================================================================== */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 36px 26px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: var(--shadow-card);
  transition: all 0.3s ease;
  position: relative;
}

.pricing-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-hover);
  border-color: var(--primary);
}

.pricing-card.popular {
  background: var(--gradient-card);
  border: 2px solid var(--primary);
  box-shadow: 0 16px 36px -8px rgba(8, 145, 178, 0.28);
  transform: translateY(-6px);
}

.pricing-card.popular:hover {
  transform: translateY(-12px);
  box-shadow: 0 20px 45px -8px rgba(8, 145, 178, 0.35);
}

.popular-tag {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--gradient-brand);
  color: #ffffff;
  font-size: 0.78rem;
  font-weight: 800;
  padding: 4px 16px;
  border-radius: 9999px;
  white-space: nowrap;
  box-shadow: 0 4px 12px rgba(8, 145, 178, 0.35);
}

.plan-title {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--text-heading);
  margin-bottom: 6px;
}

.plan-subtitle {
  font-size: 0.84rem;
  color: var(--text-muted);
  margin-bottom: 20px;
  min-height: 40px;
}

.plan-price-box {
  margin-bottom: 24px;
  padding-bottom: 20px;
  border-bottom: 1px solid rgba(8, 145, 178, 0.15);
}

.plan-price {
  font-size: 2.5rem;
  font-weight: 900;
  color: var(--primary);
  line-height: 1;
}

.plan-price span {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-sub);
}

.plan-features {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 28px;
}

.plan-features li {
  font-size: 0.9rem;
  color: var(--text-sub);
  display: flex;
  align-items: center;
  gap: 10px;
}

.plan-features svg {
  width: 18px;
  height: 18px;
  color: var(--primary);
  flex-shrink: 0;
}

/* ==========================================================================
   Testimonials
   ========================================================================== */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.testimonial-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px 26px;
  box-shadow: var(--shadow-card);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all 0.3s ease;
}

.testimonial-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
  border-color: var(--primary);
}

.testimonial-stars {
  color: #f59e0b;
  font-size: 1.1rem;
  margin-bottom: 14px;
}

.testimonial-text {
  font-size: 0.95rem;
  color: var(--text-sub);
  line-height: 1.7;
  margin-bottom: 20px;
}

.testimonial-user {
  display: flex;
  align-items: center;
  gap: 12px;
}

.user-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--gradient-brand);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1.1rem;
  box-shadow: 0 4px 10px rgba(8, 145, 178, 0.25);
}

.user-name {
  font-size: 0.98rem;
  font-weight: 700;
  color: var(--text-heading);
}

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

/* ==========================================================================
   FAQ Accordion
   ========================================================================== */
.faq-wrapper {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
  overflow: hidden;
  transition: all 0.25s ease;
}

.faq-question {
  padding: 20px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text-heading);
  user-select: none;
}

.faq-icon {
  font-size: 0.85rem;
  color: var(--primary);
  transition: transform 0.3s ease;
}

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

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.3s ease;
  padding: 0 24px;
  background: rgba(240, 252, 253, 0.5);
  color: var(--text-sub);
  font-size: 0.95rem;
  line-height: 1.7;
}

.faq-item.active .faq-answer {
  max-height: 260px;
  padding: 0 24px 20px;
}

/* ==========================================================================
   Articles Matrix
   ========================================================================== */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  box-shadow: var(--shadow-card);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all 0.3s ease;
}

.article-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
  border-color: var(--primary);
}

.article-badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--primary);
  background: var(--cyan-soft);
  padding: 4px 12px;
  border-radius: 9999px;
  margin-bottom: 14px;
}

.article-card h3 {
  font-size: 1.15rem;
  font-weight: 800;
  line-height: 1.45;
  margin-bottom: 12px;
}

.article-card h3 a {
  color: var(--text-heading);
}

.article-card h3 a:hover {
  color: var(--primary);
}

.article-desc {
  font-size: 0.88rem;
  color: var(--text-sub);
  line-height: 1.6;
  margin-bottom: 20px;
}

.article-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8rem;
  color: var(--text-muted);
  border-top: 1px solid rgba(8, 145, 178, 0.12);
  padding-top: 14px;
}

/* ==========================================================================
   Article Single Page Template
   ========================================================================== */
.article-page-header {
  padding: 140px 0 50px;
  background: rgba(224, 244, 246, 0.7);
  border-bottom: 1px solid var(--border-color);
  text-align: left;
}

.article-body-content {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 50px 40px;
  margin: -30px auto 60px;
  box-shadow: var(--shadow-card);
  line-height: 1.8;
  font-size: 1.05rem;
  color: var(--text-main);
  max-width: 900px;
}

.article-body-content h2 {
  font-size: 1.6rem;
  color: var(--text-heading);
  margin: 36px 0 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--cyan-soft);
}

.article-body-content h3 {
  font-size: 1.25rem;
  color: var(--text-heading);
  margin: 24px 0 12px;
}

.article-body-content p {
  margin-bottom: 20px;
  color: var(--text-sub);
}

.article-body-content ul, .article-body-content ol {
  margin: 16px 0 24px 28px;
  color: var(--text-sub);
}

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

.article-cta-box {
  background: linear-gradient(135deg, #ecfdf5 0%, #e0f2fe 100%);
  border: 1px solid rgba(8, 145, 178, 0.25);
  border-radius: var(--radius-lg);
  padding: 30px;
  margin: 36px 0;
  text-align: center;
}

.article-cta-box h3 {
  font-size: 1.35rem;
  color: var(--text-heading);
  margin-bottom: 10px;
}

.article-nav-links {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 40px;
  padding-top: 24px;
  border-top: 1px solid var(--border-color);
  font-weight: 600;
  font-size: 0.95rem;
}

/* ==========================================================================
   Site Footer & PBN Weight Link Area (核心任务 2)
   ========================================================================== */
.site-footer {
  background: rgba(224, 244, 246, 0.9);
  border-top: 1px solid var(--border-color);
  padding: 60px 0 40px;
  text-align: center;
}

.footer-logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 1.25rem;
  color: var(--text-heading);
  margin-bottom: 16px;
}

.footer-desc {
  color: var(--text-sub);
  font-size: 0.88rem;
  max-width: 620px;
  margin: 0 auto 20px;
  line-height: 1.6;
}

.footer-copyright {
  color: #64748b;
  font-size: 0.82rem;
  margin-bottom: 24px;
}

/* PBN 友情链接区 - 深度融合浅青色主题、美观、低调 */
.pbn-links-area {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 8px 24px;
  background: rgba(255, 255, 255, 0.85);
  border: 1px solid var(--border-color);
  border-radius: 9999px;
  font-size: 0.82rem;
  color: #64748b;
  margin-top: 12px;
  box-shadow: 0 2px 8px rgba(8, 145, 178, 0.06);
}

.pbn-links-title {
  color: #64748b;
  font-weight: 600;
}

.pbn-link-item {
  color: var(--primary);
  text-decoration: none;
  font-weight: 600;
  transition: color 0.2s ease;
}

.pbn-link-item:hover {
  color: var(--primary-hover);
  text-decoration: underline;
}

/* ==========================================================================
   Responsive Media Queries
   ========================================================================== */
@media (max-width: 1080px) {
  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }
  .pricing-card.popular {
    transform: none;
  }
  .pricing-card.popular:hover {
    transform: translateY(-8px);
  }
  .metrics-row {
    grid-template-columns: repeat(2, 1fr);
  }
  .protocols-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 860px) {
  .hero-title {
    font-size: 2.5rem;
  }
  .bento-grid {
    grid-template-columns: 1fr;
  }
  .bento-card.span-2 {
    grid-column: span 1;
  }
  .ping-grid {
    grid-template-columns: 1fr;
  }
  .testimonials-grid {
    grid-template-columns: 1fr;
  }
  .articles-grid {
    grid-template-columns: 1fr;
  }
  .nav-links {
    display: none;
  }
  .mobile-menu-toggle {
    display: block;
  }
  .article-body-content {
    padding: 28px 20px;
  }
}

@media (max-width: 540px) {
  .hero-title {
    font-size: 2.1rem;
  }
  .hero-subtitle {
    font-size: 1rem;
  }
  .pricing-grid {
    grid-template-columns: 1fr;
  }
  .metrics-row {
    grid-template-columns: 1fr;
  }
  .hero-cta-group {
    flex-direction: column;
    width: 100%;
  }
  .hero-cta-group a {
    width: 100%;
  }
  .nav-cta-btn {
    display: none;
  }
}