/* ==========================================================================
   肯德基云官网 (kennoji.xyz) - Sleek Dark Cyber Luxury Theme
   ========================================================================== */

:root {
  --bg-dark: #090d16;
  --bg-card: #121826;
  --bg-card-hover: #1a2235;
  --bg-glass: rgba(18, 24, 38, 0.75);
  
  --primary: #e60012;
  --primary-glow: rgba(230, 0, 18, 0.35);
  --primary-hover: #ff1a2d;
  --accent-amber: #ffb703;
  --accent-cyan: #06b6d4;
  
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  
  --border-light: rgba(255, 255, 255, 0.08);
  --border-glow: rgba(230, 0, 18, 0.4);
  
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 24px;
  --radius-full: 9999px;

  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
}

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

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

body {
  font-family: var(--font-family);
  background-color: var(--bg-dark);
  color: var(--text-main);
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
}

/* Background Ambient Glows */
body::before {
  content: '';
  position: fixed;
  top: -15%;
  left: 20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, var(--primary-glow) 0%, transparent 70%);
  z-index: -1;
  pointer-events: none;
  filter: blur(80px);
}

body::after {
  content: '';
  position: fixed;
  bottom: 10%;
  right: 10%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(6, 182, 212, 0.15) 0%, transparent 70%);
  z-index: -1;
  pointer-events: none;
  filter: blur(90px);
}

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

a {
  color: inherit;
  text-decoration: none;
  transition: var(--transition);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* Header & Navbar */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(9, 13, 22, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-light);
  padding: 16px 0;
  transition: var(--transition);
}

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

.brand-link {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-logo-img {
  width: 38px;
  height: 38px;
  object-fit: contain;
  border-radius: var(--radius-sm);
  background: rgba(230, 0, 18, 0.1);
  padding: 4px;
  border: 1px solid rgba(230, 0, 18, 0.3);
}

.brand-title {
  font-size: 20px;
  font-weight: 800;
  letter-spacing: -0.5px;
  background: linear-gradient(135deg, #ffffff 0%, #cbd5e1 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.brand-badge {
  font-size: 11px;
  background: linear-gradient(135deg, var(--primary) 0%, #ff4d4d 100%);
  color: #ffffff;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  font-weight: 700;
  text-transform: uppercase;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav-link {
  font-size: 15px;
  color: var(--text-muted);
  font-weight: 500;
}

.nav-link:hover {
  color: #ffffff;
}

.btn-header-cta {
  background: linear-gradient(135deg, var(--primary) 0%, #d90429 100%);
  color: #ffffff !important;
  padding: 10px 22px;
  border-radius: var(--radius-full);
  font-weight: 700;
  font-size: 14px;
  box-shadow: 0 4px 20px var(--primary-glow);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.btn-header-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 28px rgba(230, 0, 18, 0.5);
}

/* Mobile Toggle */
.mobile-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-main);
  font-size: 24px;
  cursor: pointer;
}

/* Hero Section */
.hero-section {
  padding: 160px 0 90px 0;
  position: relative;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 60px;
  align-items: center;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: rgba(230, 0, 18, 0.12);
  border: 1px solid rgba(230, 0, 18, 0.3);
  padding: 6px 16px;
  border-radius: var(--radius-full);
  font-size: 13px;
  color: #ff6b6b;
  font-weight: 600;
  margin-bottom: 24px;
}

.hero-tag-dot {
  width: 8px;
  height: 8px;
  background-color: var(--primary);
  border-radius: 50%;
  box-shadow: 0 0 10px var(--primary);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { transform: scale(0.95); opacity: 0.8; }
  50% { transform: scale(1.2); opacity: 1; }
  100% { transform: scale(0.95); opacity: 0.8; }
}

.hero-title {
  font-size: 52px;
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -1.5px;
  margin-bottom: 24px;
}

.hero-title span {
  background: linear-gradient(135deg, #ff4d4d 0%, var(--primary) 50%, #ff8080 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-desc {
  font-size: 18px;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 36px;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary) 0%, #b8000a 100%);
  color: #ffffff;
  padding: 16px 36px;
  border-radius: var(--radius-md);
  font-size: 16px;
  font-weight: 700;
  box-shadow: 0 8px 30px var(--primary-glow);
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 40px rgba(230, 0, 18, 0.55);
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text-main);
  border: 1px solid var(--border-light);
  padding: 16px 30px;
  border-radius: var(--radius-md);
  font-size: 16px;
  font-weight: 600;
}

.btn-secondary:hover {
  background: var(--bg-card-hover);
  border-color: rgba(255, 255, 255, 0.2);
  transform: translateY(-2px);
}

/* Hero Live Monitor Card */
.hero-card-monitor {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: 0 20px 50px rgba(0,0,0,0.5);
  position: relative;
  overflow: hidden;
}

.hero-card-monitor::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary) 0%, var(--accent-amber) 100%);
}

.monitor-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--border-light);
}

.monitor-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 8px;
}

.monitor-status {
  font-size: 12px;
  background: rgba(16, 185, 129, 0.15);
  color: #10b981;
  border: 1px solid rgba(16, 185, 129, 0.3);
  padding: 3px 10px;
  border-radius: var(--radius-full);
  font-weight: 600;
}

.node-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.node-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.05);
  padding: 12px 16px;
  border-radius: var(--radius-sm);
}

.node-info {
  display: flex;
  align-items: center;
  gap: 10px;
}

.node-flag {
  font-size: 18px;
}

.node-name {
  font-size: 14px;
  font-weight: 600;
}

.node-tech {
  font-size: 11px;
  color: var(--text-dim);
  background: rgba(255, 255, 255, 0.05);
  padding: 2px 6px;
  border-radius: 4px;
}

.node-ping {
  font-size: 13px;
  font-weight: 700;
  color: #10b981;
  font-family: monospace;
}

/* Stats Counter Grid */
.stats-section {
  padding: 40px 0;
  border-top: 1px solid var(--border-light);
  border-bottom: 1px solid var(--border-light);
  background: rgba(18, 24, 38, 0.4);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.stat-box {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  padding: 28px 20px;
  border-radius: var(--radius-md);
  text-align: center;
  transition: var(--transition);
}

.stat-box:hover {
  border-color: var(--border-glow);
  transform: translateY(-4px);
}

.stat-number {
  font-size: 38px;
  font-weight: 900;
  background: linear-gradient(135deg, #ffffff 0%, #cbd5e1 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 6px;
}

.stat-label {
  font-size: 14px;
  color: var(--text-muted);
}

/* Section Title Standard */
.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 60px auto;
}

.section-pill {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 1px;
  color: var(--primary);
  background: rgba(230, 0, 18, 0.1);
  border: 1px solid rgba(230, 0, 18, 0.25);
  padding: 4px 14px;
  border-radius: var(--radius-full);
  margin-bottom: 16px;
  text-transform: uppercase;
}

.section-title {
  font-size: 38px;
  font-weight: 800;
  letter-spacing: -0.8px;
  margin-bottom: 16px;
}

.section-desc {
  font-size: 16px;
  color: var(--text-muted);
  line-height: 1.6;
}

/* Features Grid */
.section-padding {
  padding: 90px 0;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.feature-card:hover {
  border-color: rgba(230, 0, 18, 0.4);
  transform: translateY(-6px);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.4);
}

.feature-icon-wrap {
  width: 56px;
  height: 56px;
  background: rgba(230, 0, 18, 0.1);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 26px;
  color: var(--primary);
  margin-bottom: 24px;
  border: 1px solid rgba(230, 0, 18, 0.2);
}

.feature-card h3 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 12px;
}

.feature-card p {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.6;
}

/* Pricing Grid */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  align-items: stretch;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 36px 24px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: var(--transition);
}

.pricing-card:hover {
  border-color: var(--border-glow);
  transform: translateY(-6px);
}

.pricing-card.popular {
  background: linear-gradient(180deg, rgba(230, 0, 18, 0.08) 0%, var(--bg-card) 40%);
  border: 2px solid var(--primary);
  box-shadow: 0 12px 40px rgba(230, 0, 18, 0.25);
}

.popular-tag {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, var(--primary) 0%, #ff4d4d 100%);
  color: #ffffff;
  font-size: 12px;
  font-weight: 800;
  padding: 4px 16px;
  border-radius: var(--radius-full);
  white-space: nowrap;
  box-shadow: 0 4px 14px var(--primary-glow);
}

.plan-name {
  font-size: 22px;
  font-weight: 800;
  margin-bottom: 8px;
}

.plan-subtitle {
  font-size: 13px;
  color: var(--text-dim);
  margin-bottom: 24px;
  min-height: 38px;
}

.price-box {
  margin-bottom: 28px;
}

.price-currency {
  font-size: 20px;
  font-weight: 700;
  color: var(--primary);
}

.price-val {
  font-size: 46px;
  font-weight: 900;
  color: var(--text-main);
}

.price-period {
  font-size: 14px;
  color: var(--text-muted);
}

.plan-features {
  list-style: none;
  margin-bottom: 32px;
  flex: 1;
}

.plan-features li {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.plan-features li i {
  color: var(--primary);
  font-style: normal;
  font-weight: 900;
}

.btn-plan {
  width: 100%;
  text-align: center;
  padding: 14px 0;
  border-radius: var(--radius-md);
  font-weight: 700;
  font-size: 15px;
}

/* Articles Grid Section (云端探索) */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}

.article-card:hover {
  border-color: var(--border-glow);
  transform: translateY(-5px);
}

.article-tag {
  font-size: 12px;
  color: var(--primary);
  font-weight: 700;
  margin-bottom: 12px;
  text-transform: uppercase;
}

.article-title {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 12px;
  line-height: 1.4;
}

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

.article-excerpt {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 20px;
  flex: 1;
}

.article-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 12px;
  color: var(--text-dim);
  padding-top: 14px;
  border-top: 1px solid var(--border-light);
}

.article-read-link {
  color: var(--primary);
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 4px;
}

/* Testimonials / User Reviews */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.testimonial-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
}

.rating-stars {
  color: var(--accent-amber);
  font-size: 16px;
  margin-bottom: 16px;
}

.testimonial-text {
  font-size: 15px;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 24px;
  font-style: italic;
}

.user-profile {
  display: flex;
  align-items: center;
  gap: 14px;
}

.user-avatar-text {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary) 0%, #ff6b6b 100%);
  color: #ffffff;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
}

.user-name {
  font-size: 15px;
  font-weight: 700;
}

.user-role {
  font-size: 12px;
  color: var(--text-dim);
}

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

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition);
}

.faq-item.active {
  border-color: rgba(230, 0, 18, 0.4);
}

.faq-question {
  padding: 22px 28px;
  font-size: 17px;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
}

.faq-toggle-icon {
  font-size: 20px;
  color: var(--primary);
  transition: transform 0.3s ease;
}

.faq-item.active .faq-toggle-icon {
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s cubic-bezier(0, 1, 0, 1);
  background: rgba(0, 0, 0, 0.2);
}

.faq-answer-inner {
  padding: 0 28px 24px 28px;
  font-size: 15px;
  color: var(--text-muted);
  line-height: 1.7;
}

/* Core Task 2: PBN Footer Friend Links */
.site-footer {
  background: #05080e;
  border-top: 1px solid var(--border-light);
  padding: 60px 0 40px 0;
}

.footer-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.footer-brand-wrap {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
}

.footer-logo-img {
  width: 32px;
  height: 32px;
}

.footer-brand-name {
  font-size: 18px;
  font-weight: 800;
  color: var(--text-main);
}

.footer-copy {
  font-size: 14px;
  color: var(--text-dim);
  margin-bottom: 24px;
}

/* Core Task 2: PBN Links Styling (Integrated, low-profile, clean dofollow) */
.friend-links-area {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding-top: 18px;
  border-top: 1px dashed rgba(255, 255, 255, 0.08);
  font-size: 13px;
  color: var(--text-dim);
}

.friend-link-title {
  color: var(--text-dim);
}

.friend-link-anchor {
  color: #71717a;
  text-decoration: none;
  transition: var(--transition);
}

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

.friend-link-sep {
  color: rgba(255, 255, 255, 0.15);
}

/* Article Page Layout */
.article-header {
  padding: 140px 0 40px 0;
  border-bottom: 1px solid var(--border-light);
  background: linear-gradient(180deg, rgba(230, 0, 18, 0.05) 0%, transparent 100%);
}

.breadcrumb {
  font-size: 13px;
  color: var(--text-dim);
  margin-bottom: 20px;
}

.breadcrumb a {
  color: var(--text-muted);
}

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

.article-main-title {
  font-size: 40px;
  font-weight: 900;
  line-height: 1.25;
  margin-bottom: 20px;
}

.article-post-meta {
  display: flex;
  align-items: center;
  gap: 20px;
  font-size: 14px;
  color: var(--text-muted);
}

.article-body {
  padding: 60px 0;
  max-width: 860px;
  margin: 0 auto;
  font-size: 17px;
  line-height: 1.85;
  color: #e2e8f0;
}

.article-body h2 {
  font-size: 26px;
  font-weight: 800;
  margin: 40px 0 20px 0;
  color: #ffffff;
  border-left: 4px solid var(--primary);
  padding-left: 16px;
}

.article-body h3 {
  font-size: 20px;
  font-weight: 700;
  margin: 30px 0 16px 0;
  color: #f1f5f9;
}

.article-body p {
  margin-bottom: 24px;
}

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

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

.article-cta-box {
  background: linear-gradient(135deg, rgba(230, 0, 18, 0.12) 0%, var(--bg-card) 100%);
  border: 1px solid var(--border-glow);
  padding: 36px;
  border-radius: var(--radius-lg);
  text-align: center;
  margin: 50px 0;
}

.article-cta-box h3 {
  font-size: 24px;
  font-weight: 800;
  margin-bottom: 12px;
  border: none;
  padding: 0;
}

.article-nav-links {
  display: flex;
  justify-content: space-between;
  padding-top: 40px;
  border-top: 1px solid var(--border-light);
  margin-top: 60px;
}

.article-nav-item {
  max-width: 48%;
}

.article-nav-label {
  font-size: 12px;
  color: var(--text-dim);
  margin-bottom: 6px;
}

.article-nav-title {
  font-size: 15px;
  font-weight: 700;
}

/* Responsive Media Queries */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .features-grid, .articles-grid, .testimonials-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .mobile-toggle {
    display: block;
  }
  .nav-menu {
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    background: var(--bg-card);
    flex-direction: column;
    padding: 30px;
    gap: 20px;
    border-bottom: 1px solid var(--border-light);
    display: none;
  }
  .nav-menu.active {
    display: flex;
  }
  .hero-title {
    font-size: 36px;
  }
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-grid, .features-grid, .articles-grid, .testimonials-grid {
    grid-template-columns: 1fr;
  }
}