/* Lumina Cloud - Modern Design System & Styling */
:root {
  --bg-dark: #07090e;
  --bg-card: rgba(15, 23, 42, 0.65);
  --bg-card-hover: rgba(30, 41, 59, 0.75);
  --border-light: rgba(255, 255, 255, 0.1);
  --border-glow: rgba(56, 189, 248, 0.4);
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --accent-cyan: #38bdf8;
  --accent-blue: #2563eb;
  --accent-sunlight: #fef08a;
  --sun-gold: rgba(253, 224, 71, 0.15);
  --sun-cyan: rgba(56, 189, 248, 0.2);
  --radius-lg: 16px;
  --radius-xl: 24px;
  --shadow-glow: 0 0 40px rgba(56, 189, 248, 0.15);
}

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

html {
  scroll-behavior: smooth;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background-color: var(--bg-dark);
  color: var(--text-main);
  line-height: 1.6;
}

body {
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
}

/* Sunlight Background Optical Elements (阳光元素) */
.sunlight-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

.sun-flare-top {
  position: absolute;
  top: -150px;
  right: -100px;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, var(--sun-gold) 0%, rgba(251, 146, 60, 0.08) 35%, transparent 70%);
  filter: blur(60px);
  animation: pulse-flare 8s infinite alternate ease-in-out;
}

.sun-flare-blue {
  position: absolute;
  top: 20%;
  left: -200px;
  width: 700px;
  height: 700px;
  background: radial-gradient(circle, var(--sun-cyan) 0%, rgba(37, 99, 235, 0.1) 40%, transparent 75%);
  filter: blur(80px);
  animation: pulse-flare 12s infinite alternate-reverse ease-in-out;
}

.sun-beam {
  position: absolute;
  top: -20%;
  right: 10%;
  width: 1200px;
  height: 400px;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.05) 0%, rgba(56, 189, 248, 0.03) 40%, transparent 80%);
  transform: rotate(-35deg);
  filter: blur(30px);
}

@keyframes pulse-flare {
  0% { transform: scale(1) translate(0, 0); opacity: 0.8; }
  100% { transform: scale(1.15) translate(-20px, 30px); opacity: 1; }
}

/* Typography & White-Blue Gradient (字体 自然白蓝渐变色) */
.text-gradient {
  background: linear-gradient(135deg, #ffffff 0%, #bae6fd 45%, #38bdf8 80%, #0284c7 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

.text-gradient-gold {
  background: linear-gradient(135deg, #ffffff 0%, #fef08a 50%, #f59e0b 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Floating Animations (价格表和教学表全部要浮动展示) */
.float-card {
  animation: cardFloat 6s ease-in-out infinite;
}

.float-card-delay-1 {
  animation: cardFloat 6.5s ease-in-out 1s infinite;
}

.float-card-delay-2 {
  animation: cardFloat 7s ease-in-out 2s infinite;
}

@keyframes cardFloat {
  0%, 100% { transform: translateY(0px); }
  50% { transform: translateY(-10px); }
}

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

/* Navigation */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  backdrop-filter: blur(16px);
  background: rgba(7, 9, 14, 0.75);
  border-bottom: 1px solid var(--border-light);
  padding: 14px 0;
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.4rem;
  font-weight: 800;
  text-decoration: none;
  color: #fff;
}

.logo-img {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  object-fit: cover;
  box-shadow: 0 0 20px rgba(56, 189, 248, 0.4);
  border: 1px solid rgba(255, 255, 255, 0.2);
  transition: transform 0.3s;
}

.logo:hover .logo-img {
  transform: scale(1.05);
}

.nav-links {
  display: flex;
  gap: 24px;
  list-style: none;
  align-items: center;
}

.nav-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.95rem;
  transition: color 0.3s;
}

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

.btn-cta {
  background: linear-gradient(135deg, #0284c7 0%, #2563eb 100%);
  color: #fff !important;
  padding: 10px 24px;
  border-radius: 50px;
  font-weight: 600 !important;
  box-shadow: 0 4px 20px rgba(37, 99, 235, 0.35);
  transition: all 0.3s ease !important;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.btn-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 25px rgba(56, 189, 248, 0.5);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.08);
  color: #f8fafc !important;
  border: 1px solid var(--border-light);
  padding: 10px 24px;
  border-radius: 50px;
  font-weight: 600 !important;
  transition: all 0.3s ease !important;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  backdrop-filter: blur(8px);
}

.btn-secondary:hover {
  background: rgba(56, 189, 248, 0.15);
  border-color: var(--accent-cyan);
  transform: translateY(-2px);
}

/* Hero Section (Two Column Layout for H1 + Right Side Vertical Metrics) */
.hero {
  padding: 160px 0 100px;
}

.hero-wrapper {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 48px;
  align-items: center;
}

.hero-left {
  text-align: left;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(56, 189, 248, 0.1);
  border: 1px solid rgba(56, 189, 248, 0.3);
  padding: 6px 18px;
  border-radius: 30px;
  font-size: 0.85rem;
  color: var(--accent-cyan);
  margin-bottom: 24px;
}

.badge-dot {
  width: 8px;
  height: 8px;
  background-color: #22c55e;
  border-radius: 50%;
  box-shadow: 0 0 10px #22c55e;
}

.hero h1 {
  font-size: 3.2rem;
  font-weight: 900;
  letter-spacing: -0.02em;
  margin-bottom: 20px;
  line-height: 1.25;
}

.hero p {
  font-size: 1.15rem;
  color: var(--text-muted);
  margin-bottom: 32px;
}

.hero-btns {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

/* Right Side Vertical Metrics Display (指令1：直排自动上下展示，位置换去H1右边页面) */
.hero-right {
  position: relative;
}

.vertical-ticker-window {
  height: 480px;
  overflow: hidden;
  position: relative;
  border-radius: var(--radius-xl);
  padding: 12px 0;
  mask-image: linear-gradient(to bottom, transparent 0%, black 8%, black 92%, transparent 100%);
  -webkit-mask-image: linear-gradient(to bottom, transparent 0%, black 8%, black 92%, transparent 100%);
}

.vertical-ticker-track {
  display: flex;
  flex-direction: column;
  gap: 16px;
  animation: verticalAutoScroll 16s ease-in-out infinite alternate;
}

.vertical-ticker-track:hover {
  animation-play-state: paused;
}

@keyframes verticalAutoScroll {
  0% { transform: translateY(0); }
  25% { transform: translateY(-135px); }
  50% { transform: translateY(-270px); }
  75% { transform: translateY(-405px); }
  100% { transform: translateY(0); }
}

.vertical-metric-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 24px 28px;
  backdrop-filter: blur(16px);
  display: flex;
  align-items: center;
  gap: 20px;
  transition: all 0.3s ease;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.4);
}

.vertical-metric-card:hover {
  border-color: var(--border-glow);
  transform: translateX(-4px);
  background: var(--bg-card-hover);
}

.vertical-metric-icon {
  width: 52px;
  height: 52px;
  background: rgba(56, 189, 248, 0.12);
  border: 1px solid rgba(56, 189, 248, 0.25);
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-cyan);
  flex-shrink: 0;
}

.vertical-metric-info {
  text-align: left;
}

.vertical-metric-number {
  font-size: 2.2rem;
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 4px;
}

.vertical-metric-label {
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* Feature Grid */
.features-section {
  padding: 80px 0;
}

.section-header {
  text-align: center;
  margin-bottom: 60px;
}

.section-header h2 {
  font-size: 2.5rem;
  margin-bottom: 16px;
  font-weight: 800;
}

.section-header p {
  color: var(--text-muted);
  font-size: 1.1rem;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 28px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-xl);
  padding: 36px;
  backdrop-filter: blur(12px);
  transition: all 0.3s ease;
}

.feature-card:hover {
  border-color: var(--border-glow);
  box-shadow: var(--shadow-glow);
}

.feature-icon {
  width: 56px;
  height: 56px;
  background: rgba(56, 189, 248, 0.1);
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-cyan);
  margin-bottom: 20px;
}

.feature-card h3 {
  font-size: 1.35rem;
  margin-bottom: 12px;
}

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

/* Pricing Section (价格表) */
.pricing-section {
  padding: 80px 0;
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 28px;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-xl);
  padding: 40px;
  backdrop-filter: blur(16px);
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all 0.3s ease;
}

.pricing-card.popular {
  border-color: var(--accent-cyan);
  background: rgba(15, 23, 42, 0.85);
  box-shadow: 0 0 35px rgba(56, 189, 248, 0.2);
}

.popular-badge {
  position: absolute;
  top: -14px;
  right: 28px;
  background: linear-gradient(135deg, #38bdf8, #2563eb);
  color: #fff;
  font-size: 0.8rem;
  font-weight: 700;
  padding: 4px 14px;
  border-radius: 20px;
}

.price-title {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.price-val {
  font-size: 3rem;
  font-weight: 900;
  color: #fff;
  margin-bottom: 6px;
}

.price-unit {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.pricing-features {
  list-style: none;
  margin-bottom: 32px;
}

.pricing-features li {
  padding: 10px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  color: #cbd5e1;
  font-size: 0.95rem;
  display: flex;
  align-items: center;
  gap: 10px;
}

.pricing-features li svg {
  color: #22c55e;
  flex-shrink: 0;
}

/* Tutorial Section (教学表) */
.tutorial-section {
  padding: 80px 0;
}

.tutorial-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.tutorial-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 28px;
  backdrop-filter: blur(12px);
  transition: all 0.3s ease;
}

.tutorial-card:hover {
  border-color: var(--accent-cyan);
}

.platform-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 16px;
}

.platform-header svg {
  width: 36px;
  height: 36px;
  color: var(--accent-cyan);
}

.platform-title {
  font-size: 1.2rem;
  font-weight: 700;
}

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

.tutorial-steps ol {
  padding-left: 20px;
}

.tutorial-steps li {
  margin-bottom: 8px;
}

/* Articles Section */
.articles-section {
  padding: 80px 0;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-xl);
  padding: 30px;
  backdrop-filter: blur(12px);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all 0.3s;
}

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

.article-tag {
  color: var(--accent-cyan);
  font-size: 0.8rem;
  font-weight: 600;
  margin-bottom: 10px;
  text-transform: uppercase;
}

.article-card h3 {
  font-size: 1.25rem;
  margin-bottom: 12px;
  line-height: 1.4;
}

.article-card h3 a {
  color: #fff;
  text-decoration: none;
  transition: color 0.3s;
}

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

.article-card p {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 20px;
}

.article-meta {
  display: flex;
  justify-content: space-between;
  font-size: 0.8rem;
  color: #64748b;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding-top: 12px;
}

/* Article Detailed Page Styling */
.article-page {
  padding: 160px 0 100px;
}

.article-container {
  max-width: 860px;
  margin: 0 auto;
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-xl);
  padding: 50px;
  backdrop-filter: blur(16px);
}

.article-content {
  color: #e2e8f0;
  font-size: 1.05rem;
  line-height: 1.8;
}

.article-content h2 {
  font-size: 1.8rem;
  margin: 36px 0 16px;
  color: #fff;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  padding-bottom: 8px;
}

.article-content h3 {
  font-size: 1.4rem;
  margin: 28px 0 14px;
  color: var(--accent-cyan);
}

.article-content p {
  margin-bottom: 20px;
}

.article-content ul, .article-content ol {
  margin-bottom: 24px;
  padding-left: 24px;
}

.article-content li {
  margin-bottom: 8px;
}

.article-content a {
  color: var(--accent-cyan);
  text-decoration: underline;
  text-underline-offset: 4px;
}

.article-cta-box {
  background: linear-gradient(135deg, rgba(14, 165, 233, 0.15), rgba(37, 99, 235, 0.15));
  border: 1px solid var(--accent-cyan);
  border-radius: var(--radius-lg);
  padding: 30px;
  margin: 40px 0;
  text-align: center;
}

/* User Reviews Section (用户评价) */
.reviews-section {
  padding: 80px 0;
}

.reviews-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 28px;
  backdrop-filter: blur(12px);
}

.user-info {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 16px;
}

.avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, #38bdf8, #2563eb);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: #fff;
}

.user-name {
  font-weight: 600;
  color: #fff;
}

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

.stars {
  color: #f59e0b;
  margin-bottom: 12px;
}

.review-text {
  font-size: 0.95rem;
  color: #cbd5e1;
}

/* FAQ Section (常见问题FAQ) */
.faq-section {
  padding: 80px 0 120px;
}

.faq-list {
  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-lg);
  overflow: hidden;
  backdrop-filter: blur(12px);
}

.faq-question {
  padding: 24px;
  font-size: 1.1rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: #fff;
  transition: background 0.3s;
}

.faq-question:hover {
  background: rgba(255, 255, 255, 0.03);
}

.faq-answer {
  padding: 0 24px 24px 24px;
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.7;
  display: none;
}

.faq-item.active .faq-answer {
  display: block;
}

.faq-toggle {
  transition: transform 0.3s;
}

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

/* Footer Section & Core PBN Backlinks Area */
footer {
  background: #030712;
  border-top: 1px solid var(--border-light);
  padding: 50px 0 30px;
  text-align: center;
  position: relative;
  z-index: 10;
}

.footer-content {
  max-width: 1000px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
}

.footer-links {
  display: flex;
  gap: 24px;
  list-style: none;
  font-size: 0.9rem;
}

.footer-links a {
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.3s;
}

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

/* Low-Key Footer SEO Links Area (页脚 PBN 权重精准输血管道) */
.seo-backlinks-area {
  margin-top: 15px;
  padding-top: 15px;
  border-top: 1px dashed rgba(255, 255, 255, 0.08);
  font-size: 0.78rem;
  color: #64748b;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

.seo-backlinks-area span {
  opacity: 0.6;
}

.seo-backlinks-area a {
  color: #64748b;
  text-decoration: none;
  transition: color 0.2s ease, opacity 0.2s ease;
}

.seo-backlinks-area a:hover {
  color: var(--accent-cyan);
  opacity: 1;
}

.copyright {
  font-size: 0.85rem;
  color: #475569;
}

/* Responsive adjustments */
@media (max-width: 992px) {
  .hero-wrapper { grid-template-columns: 1fr; text-align: center; }
  .hero-left { text-align: center; }
  .hero-btns { justify-content: center; }
  .hero h1 { font-size: 2.6rem; }
}

@media (max-width: 768px) {
  .hero h1 { font-size: 2.2rem; }
  .nav-links { display: none; }
  .pricing-grid, .grid-3, .tutorial-grid { grid-template-columns: 1fr; }
  .article-container { padding: 24px; }
}