/* TaishanNet (泰山网络) - Custom Stylesheet */
/* Color Palette: Limestone #F5F3EF, Dark Slate #353B3D, Dusty Blue #819BA7, Warm White #FFFFFF */

:root {
  --limestone: #F5F3EF;
  --dark-slate: #353B3D;
  --dusty-blue: #819BA7;
  --warm-white: #FFFFFF;
  
  --border-subtle: rgba(53, 59, 61, 0.12);
  --border-strong: rgba(53, 59, 61, 0.25);
  --border-accent: rgba(129, 155, 167, 0.35);
  
  --text-primary: #353B3D;
  --text-secondary: #565E62;
  --text-muted: #788287;
  
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  --font-serif: "Songti SC", "SimSun", "Noto Serif CJK SC", "STSong", Georgia, serif;
  
  --shadow-sm: 0 2px 8px rgba(53, 59, 61, 0.04);
  --shadow-md: 0 8px 24px rgba(53, 59, 61, 0.06);
  --shadow-lg: 0 16px 36px rgba(53, 59, 61, 0.08);
  
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  
  --max-width: 1240px;
}

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

html {
  font-size: 18px;
  scroll-behavior: smooth;
  background-color: var(--limestone);
  color: var(--text-primary);
  text-size-adjust: 100%;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.65;
  background-color: var(--limestone);
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-sans);
  color: var(--dark-slate);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.015em;
}

h1 {
  font-size: 33px; /* Mobile H1 33px */
  margin-bottom: 1rem;
}

@media (min-width: 1024px) {
  h1 {
    font-size: 48px; /* Desktop H1 48px */
  }
}

h2 {
  font-size: 26px;
  margin-bottom: 0.8rem;
}

@media (min-width: 768px) {
  h2 {
    font-size: 32px;
  }
}

h3 {
  font-size: 21px;
  margin-bottom: 0.6rem;
}

p {
  margin-bottom: 1.25rem;
  color: var(--text-secondary);
}

.serif-text {
  font-family: var(--font-serif);
  color: var(--text-muted);
  font-size: 1.05rem;
  line-height: 1.75;
}

a {
  color: var(--text-primary);
  text-decoration: none;
  transition: color 0.2s ease, border-color 0.2s ease;
}

a:hover, a:focus-visible {
  color: var(--dusty-blue);
}

/* Layout Utilities */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.25rem;
  padding-right: 1.25rem;
}

@media (min-width: 768px) {
  .container {
    padding-left: 2rem;
    padding-right: 2rem;
  }
}

.section {
  padding-top: 3.5rem;
  padding-bottom: 3.5rem;
  border-bottom: 1px solid var(--border-subtle);
}

@media (min-width: 1024px) {
  .section {
    padding-top: 5rem;
    padding-bottom: 5rem;
  }
}

.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 3rem auto;
}

.section-header p {
  font-size: 1.1rem;
}

.badge {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  font-size: 0.85rem;
  font-weight: 600;
  border-radius: 999px;
  background-color: rgba(129, 155, 167, 0.15);
  color: var(--dark-slate);
  border: 1px solid var(--dusty-blue);
  margin-bottom: 0.75rem;
}

/* Buttons & CTAs */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.85rem 1.75rem;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  text-decoration: none;
  cursor: pointer;
  transition: all 0.25s ease;
  min-height: 48px;
  line-height: 1;
}

.btn-primary {
  background-color: var(--dark-slate);
  color: var(--warm-white);
  border: 1px solid var(--dark-slate);
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover, .btn-primary:focus-visible {
  background-color: #24292b;
  color: var(--warm-white);
  border-color: #24292b;
  transform: translateY(-1px);
}

.btn-secondary {
  background-color: var(--warm-white);
  color: var(--dark-slate);
  border: 1px solid var(--border-strong);
}

.btn-secondary:hover, .btn-secondary:focus-visible {
  background-color: var(--limestone);
  border-color: var(--dusty-blue);
  color: var(--dark-slate);
}

.btn-accent {
  background-color: var(--dusty-blue);
  color: var(--warm-white);
  border: 1px solid var(--dusty-blue);
}

.btn-accent:hover, .btn-accent:focus-visible {
  background-color: #6d8995;
  color: var(--warm-white);
}

/* Header Navigation */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: rgba(245, 243, 239, 0.92);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-subtle);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--dark-slate);
}

.brand-icon {
  width: 32px;
  height: 32px;
  background-color: var(--dark-slate);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--warm-white);
  font-weight: bold;
}

.nav-desktop {
  display: none;
}

@media (min-width: 868px) {
  .nav-desktop {
    display: flex;
    align-items: center;
    gap: 1.75rem;
  }
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--dark-slate);
  padding: 0.5rem 0;
  position: relative;
}

.nav-link:hover, .nav-link.active {
  color: var(--dusty-blue);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.mobile-menu-btn {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  width: 44px;
  height: 44px;
  padding: 12px 10px;
  background: transparent;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  cursor: pointer;
}

@media (min-width: 868px) {
  .mobile-menu-btn {
    display: none;
  }
}

.mobile-menu-btn span {
  display: block;
  height: 2px;
  width: 100%;
  background-color: var(--dark-slate);
  transition: transform 0.25s ease, opacity 0.25s ease;
}

.mobile-nav {
  display: none;
  position: absolute;
  top: 72px;
  left: 0;
  width: 100%;
  background-color: var(--warm-white);
  border-bottom: 1px solid var(--border-strong);
  padding: 1.5rem;
  box-shadow: var(--shadow-md);
}

.mobile-nav.is-open {
  display: block;
}

.mobile-nav-links {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  list-style: none;
  margin-bottom: 1.5rem;
}

.mobile-nav-links a {
  display: block;
  font-size: 1.1rem;
  font-weight: 500;
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--border-subtle);
}

/* Hero Section */
.hero {
  padding-top: 3rem;
  padding-bottom: 4rem;
}

@media (min-width: 1024px) {
  .hero {
    padding-top: 5rem;
    padding-bottom: 6rem;
  }
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 3rem;
  align-items: center;
}

@media (min-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
  }
}

.hero-copy {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 1.5rem;
  width: 100%;
}

@media (min-width: 480px) {
  .hero-actions {
    width: auto;
  }
}

/* Hero Network Dashboard Visualization (Stone Layers) */
.hero-dashboard {
  background-color: var(--warm-white);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-lg);
  position: relative;
  overflow: hidden;
}

.dashboard-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 1rem;
  margin-bottom: 1.25rem;
  border-bottom: 1px solid var(--border-subtle);
}

.dashboard-title {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--dark-slate);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.dashboard-status {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--dusty-blue);
}

.stone-layers {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  position: relative;
}

.stone-layer {
  background-color: var(--limestone);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: border-color 0.3s ease;
}

.stone-layer:hover {
  border-color: var(--dusty-blue);
}

.layer-info {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.layer-badge {
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.2rem 0.5rem;
  background-color: var(--warm-white);
  border: 1px solid var(--border-subtle);
  border-radius: 4px;
  color: var(--dark-slate);
}

.layer-name {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--dark-slate);
}

.layer-meta {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.linework-container {
  margin-top: 1rem;
  padding: 1rem;
  background-color: var(--limestone);
  border-radius: var(--radius-md);
  border: 1px dashed var(--border-strong);
}

.route-lines {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.route-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.85rem;
}

.route-label {
  width: 80px;
  font-weight: 600;
  color: var(--dark-slate);
}

.route-bar-bg {
  flex: 1;
  height: 8px;
  background-color: var(--warm-white);
  border-radius: 4px;
  overflow: hidden;
  border: 1px solid var(--border-subtle);
}

.route-bar-fill {
  height: 100%;
  background-color: var(--dusty-blue);
  border-radius: 4px;
}

.route-type {
  font-size: 0.75rem;
  color: var(--text-muted);
  width: 90px;
  text-align: right;
}

/* Benefits Section (Asymmetric Layout) */
.benefits-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

@media (min-width: 1024px) {
  .benefits-grid {
    grid-template-columns: 1.3fr 1fr;
  }
}

.benefit-card {
  background-color: var(--warm-white);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 2rem;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.benefit-card-large {
  background-color: var(--warm-white);
  border: 1px solid var(--border-strong);
  position: relative;
}

.benefit-side-stack {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.benefit-icon {
  width: 48px;
  height: 48px;
  border-radius: 10px;
  background-color: var(--limestone);
  border: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.25rem;
  color: var(--dark-slate);
}

/* Geographic Strip (Global Nodes) */
.nodes-strip {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

@media (min-width: 640px) {
  .nodes-strip {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .nodes-strip {
    grid-template-columns: repeat(4, 1fr);
  }
}

.node-card {
  background-color: var(--warm-white);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
}

.node-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.node-flag {
  font-size: 1.5rem;
  line-height: 1;
}

.node-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--dark-slate);
}

.node-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 1rem;
}

.node-tag {
  font-size: 0.75rem;
  padding: 0.2rem 0.5rem;
  background-color: var(--limestone);
  border: 1px solid var(--border-subtle);
  border-radius: 4px;
  color: var(--text-secondary);
}

/* AI & Streaming Scenarios (Open text-and-diagram compositions) */
.scenarios-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

@media (min-width: 1024px) {
  .scenarios-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.scenario-card {
  background-color: var(--warm-white);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-sm);
}

.diagram-box {
  margin-top: 1.5rem;
  background-color: var(--limestone);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.25rem;
}

.app-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1rem;
}

.app-pill {
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0.35rem 0.75rem;
  background-color: var(--warm-white);
  border: 1px solid var(--border-strong);
  border-radius: 6px;
  color: var(--dark-slate);
}

/* Pricing Section */
.pricing-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  align-items: stretch;
}

@media (min-width: 640px) {
  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .pricing-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.pricing-card {
  background-color: var(--warm-white);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 2rem 1.5rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
  box-shadow: var(--shadow-sm);
  transition: transform 0.25s ease, border-color 0.25s ease;
}

.pricing-card:hover {
  transform: translateY(-2px);
  border-color: var(--dusty-blue);
}

.pricing-card.recommended {
  border: 2px solid var(--dark-slate);
  box-shadow: var(--shadow-md);
}

.recommended-badge {
  position: absolute;
  top: -12px;
  right: 1.25rem;
  background-color: var(--dark-slate);
  color: var(--warm-white);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.25rem 0.75rem;
  border-radius: 999px;
  letter-spacing: 0.05em;
}

.price-amount {
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--dark-slate);
  line-height: 1;
  margin: 1rem 0 0.5rem 0;
}

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

.pricing-features {
  list-style: none;
  margin: 1.5rem 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.pricing-features li {
  font-size: 0.9rem;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.pricing-features li::before {
  content: "✓";
  color: var(--dusty-blue);
  font-weight: bold;
}

.placeholder-note {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-style: italic;
  margin-top: 0.5rem;
}

/* Article Cards Section (3 desktop / 2 tablet / 1 mobile columns) */
.articles-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

@media (min-width: 640px) {
  .articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .articles-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.article-card {
  background-color: var(--warm-white);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: var(--shadow-sm);
  transition: border-color 0.25s ease, transform 0.25s ease;
}

.article-card:hover {
  border-color: var(--dusty-blue);
  transform: translateY(-2px);
}

.article-meta {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.article-title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  line-height: 1.35;
}

.article-title a {
  color: var(--dark-slate);
}

.article-excerpt {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 1.25rem;
}

.read-more {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--dusty-blue);
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
}

/* Testimonials Section */
.testimonials-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

@media (min-width: 768px) {
  .testimonials-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.testimonial-card {
  background-color: var(--warm-white);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
}

.testimonial-text {
  font-family: var(--font-serif);
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

.testimonial-user {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--dark-slate);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* FAQ Section */
.faq-list {
  max-width: 840px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.faq-item {
  background-color: var(--warm-white);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.faq-question {
  width: 100%;
  text-align: left;
  padding: 1.25rem 1.5rem;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--dark-slate);
  background: transparent;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.faq-answer {
  padding: 0 1.5rem 1.25rem 1.5rem;
  font-size: 0.95rem;
  color: var(--text-secondary);
  display: block;
}

/* Article Template Styles */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
  list-style: none;
}

.breadcrumb li::after {
  content: "/";
  margin-left: 0.5rem;
  color: var(--border-strong);
}

.breadcrumb li:last-child::after {
  content: "";
}

.article-header {
  margin-bottom: 2.5rem;
}

.article-content {
  background-color: var(--warm-white);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-sm);
  margin-bottom: 3rem;
}

@media (min-width: 768px) {
  .article-content {
    padding: 3rem;
  }
}

.article-content h2 {
  margin-top: 2rem;
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-subtle);
}

.article-content h3 {
  margin-top: 1.5rem;
  margin-bottom: 0.75rem;
}

.article-content ul, .article-content ol {
  margin-bottom: 1.5rem;
  padding-left: 1.5rem;
}

.article-content li {
  margin-bottom: 0.5rem;
}

.related-articles {
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border-subtle);
}

/* Footer */
.site-footer {
  background-color: var(--dark-slate);
  color: var(--limestone);
  padding-top: 4rem;
  padding-bottom: 2.5rem;
  margin-top: auto;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  margin-bottom: 3rem;
}

@media (min-width: 768px) {
  .footer-grid {
    grid-template-columns: 2fr 1fr 1fr;
  }
}

.footer-brand h4 {
  color: var(--warm-white);
  font-size: 1.25rem;
  margin-bottom: 0.75rem;
}

.footer-brand p {
  color: #A0A8AC;
  font-size: 0.9rem;
  max-width: 400px;
}

.footer-col h5 {
  color: var(--warm-white);
  font-size: 0.95rem;
  margin-bottom: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.footer-links a {
  color: #C2C8CB;
  font-size: 0.9rem;
}

.footer-links a:hover {
  color: var(--warm-white);
}

.footer-bottom {
  padding-top: 1.5rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  flex-direction: column;
  gap: 1rem;
  align-items: center;
  justify-content: space-between;
  font-size: 0.85rem;
  color: #A0A8AC;
}

@media (min-width: 768px) {
  .footer-bottom {
    flex-direction: row;
  }
}

/* Reduced Motion Override */
@media (prefers-reduced-motion: reduce) {
  *, ::before, ::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}