/* ==========================================================================
   KTM云 (ktmyun.xyz) 官方设计系统与样式表
   ========================================================================== */

:root {
  --bg-dark: #07090e;
  --bg-card: rgba(18, 24, 38, 0.7);
  --bg-card-hover: rgba(26, 35, 56, 0.85);
  --border-color: rgba(0, 242, 254, 0.15);
  --border-glow: rgba(0, 242, 254, 0.4);
  
  --primary-cyan: #00f2fe;
  --primary-blue: #4facfe;
  --accent-purple: #7f00ff;
  --accent-neon: #00f5a0;
  --accent-amber: #ff9a9e;
  
  --text-main: #f1f5f9;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-full: 9999px;
  
  --shadow-glow: 0 0 25px rgba(0, 242, 254, 0.25);
  --shadow-card: 0 10px 30px -10px rgba(0, 0, 0, 0.5);
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Reset & Base */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  background-color: var(--bg-dark);
  color: var(--text-main);
  font-family: var(--font-family);
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
}

/* Background Animated Gradient Orbs */
.bg-glow-orb {
  position: fixed;
  border-radius: 50%;
  filter: blur(120px);
  z-index: -1;
  pointer-events: none;
  opacity: 0.35;
  animation: orbFloat 18s ease-in-out infinite alternate;
}

.orb-1 {
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, var(--primary-cyan) 0%, rgba(0, 242, 254, 0) 70%);
  top: -100px;
  left: -100px;
}

.orb-2 {
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, var(--accent-purple) 0%, rgba(127, 0, 255, 0) 70%);
  bottom: 10%;
  right: -150px;
  animation-delay: -5s;
}

.orb-3 {
  width: 450px;
  height: 450px;
  background: radial-gradient(circle, var(--primary-blue) 0%, rgba(79, 172, 254, 0) 70%);
  top: 40%;
  left: 30%;
  animation-delay: -9s;
}

@keyframes orbFloat {
  0% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(60px, 40px) scale(1.1); }
  100% { transform: translate(-40px, 80px) scale(0.95); }
}

/* Custom Mouse Trail Canvas */
#trail-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: 99999;
}

/* Typography Helpers */
h1, h2, h3, h4, h5, h6 {
  color: #ffffff;
  font-weight: 700;
  line-height: 1.25;
}

.gradient-text {
  background: linear-gradient(135deg, var(--primary-cyan) 0%, var(--primary-blue) 50%, var(--accent-neon) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.gradient-purple-text {
  background: linear-gradient(135deg, #a855f7 0%, var(--primary-cyan) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Header Navbar */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(7, 9, 14, 0.75);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
  padding: 1rem 0;
  transition: var(--transition);
}

.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

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

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
}

.brand-logo img, .brand-logo svg {
  width: 42px;
  height: 42px;
  filter: drop-shadow(0 0 10px rgba(0, 242, 254, 0.5));
}

.brand-name {
  font-size: 1.4rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  color: #fff;
}

.brand-name span {
  color: var(--primary-cyan);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
  list-style: none;
}

.nav-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  transition: var(--transition);
}

.nav-links a:hover {
  color: var(--primary-cyan);
  text-shadow: 0 0 12px rgba(0, 242, 254, 0.4);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.6rem;
  border-radius: var(--radius-full);
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: var(--transition);
  border: 1px solid transparent;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary-cyan) 0%, var(--primary-blue) 100%);
  color: #040914;
  box-shadow: 0 4px 20px rgba(0, 242, 254, 0.35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(0, 242, 254, 0.55);
}

.btn-outline {
  background: rgba(255, 255, 255, 0.03);
  border-color: var(--border-color);
  color: var(--text-main);
}

.btn-outline:hover {
  border-color: var(--primary-cyan);
  background: rgba(0, 242, 254, 0.08);
  color: #fff;
}

.btn-lg {
  padding: 1rem 2.2rem;
  font-size: 1.1rem;
}

/* Hero Section */
.hero {
  padding: 10rem 0 5rem;
  text-align: center;
  position: relative;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 1.2rem;
  background: rgba(0, 242, 254, 0.08);
  border: 1px solid rgba(0, 242, 254, 0.25);
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  color: var(--primary-cyan);
  margin-bottom: 1.5rem;
  box-shadow: inset 0 0 15px rgba(0, 242, 254, 0.1);
}

.hero-badge i {
  display: inline-block;
  width: 8px;
  height: 8px;
  background: var(--accent-neon);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--accent-neon);
}

.hero-title {
  font-size: 3.5rem;
  line-height: 1.15;
  margin-bottom: 1.5rem;
  letter-spacing: -1px;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-muted);
  max-width: 780px;
  margin: 0 auto 2.5rem;
}

.hero-cta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.2rem;
  margin-bottom: 4rem;
  flex-wrap: wrap;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  max-width: 900px;
  margin: 0 auto;
  padding: 1.5rem;
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
}

.stat-item h3 {
  font-size: 1.8rem;
  color: var(--primary-cyan);
}

.stat-item p {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Feature Highlights Grid */
.section {
  padding: 5rem 0;
}

.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 3.5rem;
}

.section-tag {
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--primary-cyan);
  margin-bottom: 0.5rem;
}

.section-title {
  font-size: 2.3rem;
  margin-bottom: 1rem;
}

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

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.feature-card {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 2rem;
  transition: var(--transition);
}

.feature-card:hover {
  transform: translateY(-5px);
  border-color: var(--border-glow);
  box-shadow: var(--shadow-glow);
  background: var(--bg-card-hover);
}

.feature-icon {
  width: 54px;
  height: 54px;
  border-radius: var(--radius-sm);
  background: rgba(0, 242, 254, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  color: var(--primary-cyan);
  margin-bottom: 1.5rem;
  border: 1px solid rgba(0, 242, 254, 0.2);
}

.feature-card h3 {
  font-size: 1.25rem;
  margin-bottom: 0.75rem;
}

.feature-card p {
  color: var(--text-muted);
  font-size: 0.95rem;
}

/* ==========================================================================
   PRICING SECTION - EXACT REQUIREMENT: ALL IN ONE ROW (一排)
   ========================================================================== */
.pricing-section {
  background: linear-gradient(180deg, rgba(7, 9, 14, 0) 0%, rgba(13, 17, 26, 0.8) 50%, rgba(7, 9, 14, 0) 100%);
  padding: 6rem 0;
  position: relative;
}

.pricing-row-wrapper {
  width: 100%;
  overflow-x: auto;
  padding: 1rem 0 2rem 0;
  /* Hide scrollbar for Chrome, Safari and Opera */
  -ms-overflow-style: none;  /* IE and Edge */
  scrollbar-width: none;  /* Firefox */
}

.pricing-row-wrapper::-webkit-scrollbar {
  display: none;
}

.pricing-row {
  display: flex;
  flex-direction: row;
  flex-wrap: nowrap;
  gap: 1.5rem;
  min-width: min-content;
  justify-content: center;
  align-items: stretch;
}

.price-card {
  flex: 0 0 280px;
  width: 280px;
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2rem 1.5rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
  transition: var(--transition);
}

.price-card:hover {
  transform: translateY(-8px);
  border-color: var(--primary-cyan);
  box-shadow: 0 15px 35px rgba(0, 242, 254, 0.25);
}

.price-card.popular {
  border-color: var(--primary-cyan);
  background: rgba(18, 30, 50, 0.85);
  box-shadow: 0 0 30px rgba(0, 242, 254, 0.2);
}

.popular-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, var(--primary-cyan), var(--primary-blue));
  color: #000;
  font-size: 0.75rem;
  font-weight: 800;
  padding: 0.3rem 1.2rem;
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.price-header {
  margin-bottom: 1.5rem;
  text-align: center;
}

.plan-name {
  font-size: 1.3rem;
  margin-bottom: 0.5rem;
}

.plan-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  min-height: 40px;
}

.price-amount {
  font-size: 2.5rem;
  font-weight: 800;
  color: #fff;
  margin: 1rem 0;
  text-align: center;
}

.price-amount span {
  font-size: 1rem;
  color: var(--text-muted);
  font-weight: 400;
}

.price-features {
  list-style: none;
  margin-bottom: 2rem;
  flex-grow: 1;
}

.price-features li {
  padding: 0.6rem 0;
  font-size: 0.9rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 0.6rem;
  border-bottom: 1px dashed rgba(255, 255, 255, 0.06);
}

.price-features li i {
  color: var(--accent-neon);
  font-size: 1rem;
}

/* User Reviews Section */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.8rem;
}

.review-card {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.8rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.review-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1rem;
}

.user-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary-cyan), var(--accent-purple));
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: #fff;
  font-size: 1.1rem;
}

.user-info h4 {
  font-size: 1rem;
}

.user-info p {
  font-size: 0.8rem;
  color: var(--text-dim);
}

.star-rating {
  color: #fbbf24;
  margin-bottom: 0.8rem;
  font-size: 0.9rem;
}

.review-text {
  font-size: 0.92rem;
  color: var(--text-muted);
  font-style: italic;
  margin-bottom: 1rem;
}

.review-badge {
  font-size: 0.75rem;
  color: var(--accent-neon);
  background: rgba(0, 245, 160, 0.08);
  padding: 0.3rem 0.8rem;
  border-radius: var(--radius-full);
  display: inline-block;
  width: fit-content;
}

/* FAQ Accordion Section */
.faq-container {
  max-width: 860px;
  margin: 0 auto;
}

.faq-item {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  margin-bottom: 1rem;
  overflow: hidden;
  transition: var(--transition);
}

.faq-question {
  padding: 1.4rem 1.8rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  font-weight: 600;
  font-size: 1.05rem;
  user-select: none;
}

.faq-toggle {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: rgba(0, 242, 254, 0.1);
  color: var(--primary-cyan);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  transition: var(--transition);
}

.faq-item.active .faq-toggle {
  transform: rotate(45deg);
  background: var(--primary-cyan);
  color: #000;
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s cubic-bezier(0, 1, 0, 1);
  padding: 0 1.8rem;
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.7;
}

.faq-item.active .faq-answer {
  max-height: 500px;
  padding: 0 1.8rem 1.6rem;
  transition: max-height 0.4s ease-in-out;
}

/* Article Matrix Grid (SEO Articles) */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: var(--transition);
  overflow: hidden;
}

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

.article-image {
  width: 100%;
  height: 180px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  margin-bottom: 1.2rem;
  background: rgba(4, 9, 20, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.05);
  position: relative;
}

.article-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition);
}

.article-card:hover .article-image img {
  transform: scale(1.06);
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  font-size: 0.8rem;
  color: var(--text-dim);
  margin-bottom: 0.8rem;
}

.article-tag {
  background: rgba(0, 242, 254, 0.1);
  color: var(--primary-cyan);
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
}

.article-card h3 {
  font-size: 1.15rem;
  margin-bottom: 0.8rem;
  line-height: 1.4;
}

.article-card h3 a {
  color: #fff;
  text-decoration: none;
  transition: var(--transition);
}

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

.article-excerpt {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-link {
  color: var(--primary-cyan);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  transition: var(--transition);
}

.article-link:hover {
  gap: 0.8rem;
}

/* Article Detail Page Specific Layout */
.article-detail-page {
  padding: 9rem 0 5rem;
}

.article-header {
  max-width: 900px;
  margin: 0 auto 3rem;
  text-align: center;
}

.article-title-large {
  font-size: 2.8rem;
  line-height: 1.25;
  margin: 1.2rem 0;
}

.article-content-container {
  max-width: 860px;
  margin: 0 auto;
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 3rem 2.5rem;
  box-shadow: var(--shadow-card);
}

.article-body {
  font-size: 1.05rem;
  line-height: 1.85;
  color: #cbd5e1;
}

.article-body h2 {
  font-size: 1.7rem;
  margin: 2.5rem 0 1.2rem;
  color: #fff;
  border-left: 4px solid var(--primary-cyan);
  padding-left: 1rem;
}

.article-body h3 {
  font-size: 1.3rem;
  margin: 1.8rem 0 1rem;
  color: var(--primary-cyan);
}

.article-body p {
  margin-bottom: 1.4rem;
}

.article-body ul, .article-body ol {
  margin: 1rem 0 1.5rem 1.5rem;
  color: #cbd5e1;
}

.article-body li {
  margin-bottom: 0.6rem;
}

.article-body blockquote {
  background: rgba(0, 242, 254, 0.05);
  border-left: 4px solid var(--primary-cyan);
  padding: 1.2rem 1.5rem;
  margin: 1.5rem 0;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-style: italic;
  color: var(--text-main);
}

.article-body a {
  color: var(--primary-cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
  font-weight: 500;
  transition: var(--transition);
}

.article-body a:hover {
  color: var(--accent-neon);
  text-shadow: 0 0 8px rgba(0, 245, 160, 0.4);
}

.keyword-badge {
  display: inline-block;
  background: rgba(127, 0, 255, 0.15);
  border: 1px solid rgba(127, 0, 255, 0.3);
  color: #c084fc;
  font-size: 0.85rem;
  padding: 0.2rem 0.7rem;
  border-radius: var(--radius-sm);
  margin: 0.2rem;
  font-weight: 600;
}

.article-cta-box {
  background: linear-gradient(135deg, rgba(0, 242, 254, 0.1) 0%, rgba(127, 0, 255, 0.1) 100%);
  border: 1px solid var(--primary-cyan);
  border-radius: var(--radius-md);
  padding: 2rem;
  text-align: center;
  margin: 3rem 0;
}

.article-cta-box h3 {
  font-size: 1.5rem;
  margin-bottom: 0.8rem;
}

.article-cta-box p {
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

/* Internal Jump Pipeline Links Section inside Articles */
.internal-links-box {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  margin-top: 3rem;
}

.internal-links-box h4 {
  font-size: 1.1rem;
  color: var(--primary-cyan);
  margin-bottom: 1rem;
}

.internal-links-list {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.8rem;
}

.internal-links-list a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.internal-links-list a:hover {
  color: var(--primary-cyan);
}

/* ==========================================================================
   CORE TASK 2: FOOTER PBN WEIGHT PIPELINE (页脚 PBN 权重精准输血管道)
   ========================================================================== */
.footer-pbn {
  background: #040609;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding: 3rem 0 2rem;
  color: var(--text-dim);
  font-size: 0.82rem;
  text-align: center;
  position: relative;
  z-index: 10;
}

.footer-content {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  color: #fff;
  font-size: 1.1rem;
  font-weight: 700;
}

.footer-brand svg, .footer-brand img {
  width: 28px;
  height: 28px;
}

.pbn-links-container {
  width: 100%;
  padding: 1rem;
  background: rgba(255, 255, 255, 0.015);
  border: 1px solid rgba(255, 255, 255, 0.04);
  border-radius: var(--radius-md);
}

.pbn-title {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: rgba(255, 255, 255, 0.35);
  margin-bottom: 0.8rem;
  font-weight: 600;
}

.pbn-links-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.8rem 1.5rem;
  list-style: none;
}

.pbn-links-grid a {
  color: rgba(255, 255, 255, 0.45);
  text-decoration: none;
  font-size: 0.78rem;
  transition: var(--transition);
}

.pbn-links-grid a:hover {
  color: var(--primary-cyan);
  text-shadow: 0 0 6px rgba(0, 242, 254, 0.4);
}

.footer-copy {
  color: rgba(255, 255, 255, 0.3);
  font-size: 0.75rem;
}

/* Mobile Responsiveness */
@media (max-width: 1024px) {
  .hero-title {
    font-size: 2.8rem;
  }
  
  .features-grid, .reviews-grid, .articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .pricing-row {
    justify-content: flex-start;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }
  
  .hero-title {
    font-size: 2.1rem;
  }
  
  .hero-subtitle {
    font-size: 1rem;
  }
  
  .features-grid, .reviews-grid, .articles-grid {
    grid-template-columns: 1fr;
  }
  
  .internal-links-list {
    grid-template-columns: 1fr;
  }
  
  .article-content-container {
    padding: 1.8rem 1.2rem;
  }
  
  .article-title-large {
    font-size: 1.9rem;
  }

  .price-card {
    flex: 0 0 260px;
    width: 260px;
  }
}