/* ==========================================================================
   梦想云 (mengxiangyun.xyz) - Global Theme & Stylesheet
   Aesthetic: Premium Dark Cyberpunk / Glassmorphism / Tech Glow
   ========================================================================== */

:root {
  --bg-dark: #07090e;
  --bg-card: rgba(18, 24, 38, 0.75);
  --bg-card-hover: rgba(28, 36, 56, 0.85);
  --border-color: rgba(255, 255, 255, 0.08);
  --border-glow: rgba(255, 77, 77, 0.35);
  
  --primary-red: #ff4d4d;
  --primary-red-hover: #ff3333;
  --primary-red-glow: rgba(255, 77, 77, 0.4);
  
  --accent-cyan: #00f2fe;
  --accent-blue: #4facfe;
  --accent-purple: #7000ff;
  
  --text-main: #f0f4f8;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  
  --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --radius-lg: 16px;
  --radius-md: 12px;
  --radius-sm: 8px;
}

/* Reset & Basic Setup */
*, *::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-sans);
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
}

/* Background Canvas Layer */
#tech-bg {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: -2;
  pointer-events: none;
}

#mouse-trail {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 9999;
  pointer-events: none;
}

/* Container */
.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Header & Navigation */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(7, 9, 14, 0.85);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  padding: 16px 0;
  transition: var(--transition);
}

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

.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text-main);
  font-weight: 700;
  font-size: 22px;
}

.brand-logo svg {
  height: 36px;
  width: auto;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

.nav-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 15px;
  font-weight: 500;
  transition: var(--transition);
}

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 22px;
  border-radius: 30px;
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: var(--transition);
  border: 1px solid transparent;
}

.btn-primary {
  background: linear-gradient(135deg, #ff4d4d 0%, #f04438 100%);
  color: #ffffff;
  box-shadow: 0 4px 20px var(--primary-red-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 26px rgba(255, 77, 77, 0.6);
  background: linear-gradient(135deg, #ff5c5c 0%, #ff3333 100%);
}

.btn-recommend {
  background: rgba(0, 242, 254, 0.1);
  color: var(--accent-cyan);
  border: 1px solid rgba(0, 242, 254, 0.3);
  box-shadow: 0 0 15px rgba(0, 242, 254, 0.15);
}

.btn-recommend:hover {
  background: rgba(0, 242, 254, 0.2);
  border-color: var(--accent-cyan);
  box-shadow: 0 0 22px rgba(0, 242, 254, 0.4);
  transform: translateY(-2px);
  color: #fff;
}

.btn-outline {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-main);
  border: 1px solid var(--border-color);
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.2);
}

.btn-lg {
  padding: 14px 32px;
  font-size: 17px;
  border-radius: 36px;
}

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

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: 20px;
  background: rgba(255, 77, 77, 0.1);
  border: 1px solid rgba(255, 77, 77, 0.25);
  color: var(--primary-red);
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 24px;
}

.hero-title {
  font-size: 54px;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: 24px;
  background: linear-gradient(180deg, #ffffff 0%, #cbd5e1 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-title span {
  background: linear-gradient(135deg, #ff4d4d 0%, #00f2fe 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 19px;
  color: var(--text-muted);
  max-width: 760px;
  margin: 0 auto 36px;
  line-height: 1.6;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}

.protocol-tags {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

.protocol-tag {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  font-size: 13px;
  color: var(--text-muted);
}

/* Sections */
.section {
  padding: 90px 0;
  position: relative;
}

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

.section-tag {
  color: var(--primary-red);
  font-size: 14px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 12px;
}

.section-title {
  font-size: 38px;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 16px;
}

.section-subtitle {
  font-size: 16px;
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto;
}

/* Features Grid */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: var(--transition);
  backdrop-filter: blur(12px);
}

.feature-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-glow);
  transform: translateY(-4px);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.4);
}

.feature-icon {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  background: rgba(255, 77, 77, 0.1);
  color: var(--primary-red);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  margin-bottom: 20px;
}

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

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

/* Pricing Section - STRICT SINGLE ROW ON DESKTOP */
.pricing-row {
  display: flex;
  flex-direction: row;
  justify-content: space-between;
  gap: 20px;
  width: 100%;
}

.pricing-card {
  flex: 1;
  min-width: 0;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px 20px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: var(--transition);
  backdrop-filter: blur(12px);
}

.pricing-card.popular {
  border-color: var(--primary-red);
  background: rgba(28, 20, 30, 0.85);
  box-shadow: 0 0 30px rgba(255, 77, 77, 0.2);
}

.popular-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, #ff4d4d, #f04438);
  color: #fff;
  font-size: 12px;
  font-weight: 700;
  padding: 4px 14px;
  border-radius: 12px;
  white-space: nowrap;
  letter-spacing: 0.05em;
}

.pricing-header h3 {
  font-size: 19px;
  font-weight: 700;
  margin-bottom: 8px;
  text-align: center;
}

.pricing-desc {
  font-size: 13px;
  color: var(--text-muted);
  text-align: center;
  min-height: 38px;
}

.pricing-price {
  margin: 24px 0;
  text-align: center;
}

.price-amount {
  font-size: 36px;
  font-weight: 800;
  color: var(--text-main);
}

.price-unit {
  font-size: 13px;
  color: var(--text-dim);
}

.pricing-features {
  list-style: none;
  margin-bottom: 28px;
  flex-grow: 1;
}

.pricing-features li {
  font-size: 13px;
  color: var(--text-muted);
  padding: 8px 0;
  border-bottom: 1px dashed rgba(255, 255, 255, 0.05);
  display: flex;
  align-items: center;
  gap: 8px;
}

.pricing-features li svg {
  color: var(--accent-cyan);
  flex-shrink: 0;
}

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

/* Articles Section */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 24px;
}

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

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

.article-content {
  padding: 24px;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.article-meta {
  display: flex;
  gap: 12px;
  font-size: 13px;
  color: var(--text-dim);
  margin-bottom: 12px;
}

.article-meta .category {
  color: var(--primary-red);
  font-weight: 600;
}

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

.article-title a {
  color: var(--text-main);
  text-decoration: none;
  transition: var(--transition);
}

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

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

.article-link {
  color: var(--accent-cyan);
  text-decoration: none;
  font-size: 14px;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: var(--transition);
}

.article-link:hover {
  gap: 10px;
  color: #ffffff;
}

/* User Reviews Section */
.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-color);
  border-radius: var(--radius-lg);
  padding: 28px;
  backdrop-filter: blur(12px);
}

.review-stars {
  color: #ffb800;
  font-size: 16px;
  margin-bottom: 14px;
}

.review-text {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 20px;
  font-style: italic;
}

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

.avatar-placeholder {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary-red), var(--accent-purple));
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: #fff;
}

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

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

/* FAQ Accordion */
.faq-list {
  max-width: 840px;
  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);
  overflow: hidden;
  transition: var(--transition);
}

.faq-question {
  padding: 20px 24px;
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  color: var(--text-main);
  font-size: 17px;
  font-weight: 600;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
}

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

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

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
  color: var(--text-muted);
  font-size: 15px;
  line-height: 1.7;
}

.faq-item.active .faq-answer {
  max-height: 400px;
  padding: 0 24px 20px;
}

/* Article Detail Page Specific Styles */
.article-detail-container {
  max-width: 900px;
  margin: 140px auto 90px;
  padding: 0 24px;
}

.article-header {
  margin-bottom: 40px;
  text-align: center;
}

.article-header h1 {
  font-size: 36px;
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 16px;
}

.article-header .meta-bar {
  display: flex;
  justify-content: center;
  gap: 20px;
  font-size: 14px;
  color: var(--text-dim);
}

.article-body {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 48px;
  backdrop-filter: blur(12px);
  font-size: 16px;
  line-height: 1.8;
  color: #d1d5db;
}

.article-body h2 {
  font-size: 24px;
  color: #fff;
  margin: 32px 0 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-color);
}

.article-body h3 {
  font-size: 20px;
  color: #f3f4f6;
  margin: 24px 0 12px;
}

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

.article-body ul, .article-body ol {
  margin-bottom: 20px;
  padding-left: 24px;
}

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

.article-cta-box {
  margin: 40px 0;
  padding: 28px;
  background: linear-gradient(135deg, rgba(255, 77, 77, 0.15), rgba(0, 242, 254, 0.1));
  border: 1px solid var(--primary-red);
  border-radius: var(--radius-md);
  text-align: center;
}

.article-cta-box h3 {
  font-size: 22px;
  margin-bottom: 12px;
  color: #fff;
}

.article-cta-box p {
  font-size: 15px;
  color: var(--text-muted);
  margin-bottom: 20px;
}

/* Interlinking Grid Box inside Articles */
.interlink-box {
  margin-top: 48px;
  padding: 28px;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
}

.interlink-box h3 {
  font-size: 18px;
  margin-bottom: 16px;
  color: var(--accent-cyan);
}

.interlink-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 12px;
  list-style: none;
  padding: 0;
}

.interlink-list a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 14px;
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: 6px;
}

.interlink-list a:hover {
  color: var(--primary-red);
  transform: translateX(4px);
}

/* Footer & PBN Link Injection Area */
.site-footer {
  background: rgba(5, 7, 10, 0.95);
  border-top: 1px solid var(--border-color);
  padding: 60px 0 30px;
  text-align: center;
}

.footer-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 20px;
  font-weight: 700;
}

.footer-links {
  display: flex;
  gap: 20px;
  list-style: none;
}

.footer-links a {
  color: var(--text-dim);
  text-decoration: none;
  font-size: 14px;
  transition: var(--transition);
}

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

/* PBN Friend Link Section - Exact requirements from task */
.pbn-link-section {
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px dashed rgba(255, 255, 255, 0.05);
  font-size: 13px;
  color: var(--text-dim);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

.pbn-link-section span {
  opacity: 0.6;
}

.pbn-link-section a {
  color: var(--text-muted);
  text-decoration: none;
  transition: var(--transition);
  font-size: 13px;
}

.pbn-link-section a:hover {
  color: var(--accent-cyan);
}

.copyright {
  font-size: 13px;
  color: var(--text-dim);
}

/* Responsive Rules */
@media (max-width: 1024px) {
  .pricing-row {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
  }
  .hero-title {
    font-size: 42px;
  }
}

@media (max-width: 768px) {
  .pricing-row {
    grid-template-columns: 1fr;
  }
  
  .nav-links {
    display: none;
  }
  
  .hero-title {
    font-size: 32px;
  }
  
  .hero-subtitle {
    font-size: 16px;
  }
  
  .section-title {
    font-size: 28px;
  }
  
  .article-body {
    padding: 24px;
  }
}