/* 暖白棕色编辑室 (Warm White & Brown Editorial Room Style) */
:root {
  --bg-color: #FBF8F3;
  --primary-color: #604638;
  --accent-color: #B99573;
  --text-color: #302A26;
  --card-bg: #FFFFFF;
  --card-border: #E6DDD0;
  --alt-bg: #F7F3EC;
  --muted-text: #766B63;
  --focus-ring: #604638;

  --font-heading: Georgia, "Songti SC", SimSun, serif;
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
}

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

html {
  font-size: 17px;
  scroll-behavior: smooth;
  background-color: var(--bg-color);
  color: var(--text-color);
  font-family: var(--font-body);
  line-height: 1.7;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background-color: var(--bg-color);
  color: var(--text-color);
  overflow-x: hidden;
}

/* Base Accessibility & Focus */
a {
  color: var(--primary-color);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--accent-color);
}

:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 3px;
}

/* Link Underline Expansion Effect */
.editorial-link {
  position: relative;
  display: inline-block;
  color: var(--primary-color);
  font-weight: 600;
  text-decoration: none;
}

.editorial-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 0%;
  height: 1.5px;
  background-color: var(--accent-color);
  transition: width 0.25s ease;
}

.editorial-link:hover::after,
.editorial-link:focus::after {
  width: 100%;
}

/* Animations & Reduced Motion */
.fade-in-up {
  animation: fadeInUpShort 0.5s ease forwards;
}

@keyframes fadeInUpShort {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@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;
  }
}

/* Typography Rules */
h1, h2, h3, h4 {
  font-family: var(--font-heading);
  color: var(--primary-color);
  line-height: 1.3;
  font-weight: 700;
}

h1 {
  font-size: 35px; /* Mobile Default */
  margin-bottom: 1.2rem;
}

@media (min-width: 1024px) {
  h1 {
    font-size: 54px; /* Desktop Standard */
    line-height: 1.25;
  }
}

h2 {
  font-size: 28px;
  margin-bottom: 1rem;
  position: relative;
}

h2.section-title::after {
  content: "";
  display: block;
  width: 36px;
  height: 2px;
  background-color: var(--accent-color);
  margin-top: 10px;
}

h3 {
  font-size: 20px;
  margin-bottom: 0.75rem;
}

p {
  margin-bottom: 1rem;
  font-size: 17px;
  color: var(--text-color);
}

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

/* Container */
.container {
  width: 100%;
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Header & Mobile Navigation */
.site-header {
  width: 100%;
  background-color: rgba(251, 248, 243, 0.95);
  border-bottom: 1px solid var(--card-border);
  position: sticky;
  top: 0;
  z-index: 1000;
  backdrop-filter: blur(8px);
}

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

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-heading);
  font-size: 22px;
  font-weight: 700;
  color: var(--primary-color);
}

.brand-logo img {
  height: 38px;
  width: auto;
}

.nav-desktop {
  display: none;
}

@media (min-width: 900px) {
  .nav-desktop {
    display: flex;
    align-items: center;
    gap: 2rem;
  }

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

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

.nav-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.5rem 1.2rem;
  background-color: var(--primary-color);
  color: #FBF8F3 !important;
  font-size: 15px;
  font-weight: 600;
  border-radius: 4px;
  transition: background-color 0.2s ease;
}

.nav-cta:hover {
  background-color: var(--accent-color);
}

.mobile-menu-btn {
  display: flex;
  flex-direction: column;
  justify-content: space-around;
  width: 32px;
  height: 32px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 4px;
  z-index: 1100;
}

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

@media (min-width: 900px) {
  .mobile-menu-btn {
    display: none;
  }
}

/* Mobile Drawer */
.mobile-nav-drawer {
  position: fixed;
  top: 72px;
  left: 0;
  width: 100%;
  background-color: var(--bg-color);
  border-bottom: 1px solid var(--card-border);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
  transform: translateY(-150%);
  transition: transform 0.3s ease;
  z-index: 999;
  box-shadow: 0 10px 20px rgba(96, 70, 56, 0.08);
}

.mobile-nav-drawer.open {
  transform: translateY(0);
}

.mobile-nav-drawer a {
  font-size: 17px;
  font-weight: 500;
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--card-border);
  color: var(--text-color);
}

/* Hero Section (上下布局) */
.hero-section {
  padding: 4rem 0 3rem 0;
  border-bottom: 1px solid var(--card-border);
}

.hero-top {
  max-width: 860px;
  margin-bottom: 3rem;
}

.hero-tag {
  display: inline-block;
  font-family: var(--font-heading);
  font-size: 13px;
  letter-spacing: 1.5px;
  color: var(--accent-color);
  text-transform: uppercase;
  margin-bottom: 1rem;
  border-bottom: 1px solid var(--accent-color);
  padding-bottom: 2px;
}

.hero-summary {
  font-size: 19px;
  line-height: 1.8;
  color: #4A4039;
  margin-bottom: 2rem;
}

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

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.8rem 1.8rem;
  background-color: var(--primary-color);
  color: #FBF8F3;
  font-size: 16px;
  font-weight: 600;
  border-radius: 4px;
  border: 1px solid var(--primary-color);
  transition: all 0.2s ease;
}

.btn-primary:hover {
  background-color: var(--accent-color);
  border-color: var(--accent-color);
  color: #FFFFFF;
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.8rem 1.8rem;
  background-color: transparent;
  color: var(--primary-color);
  font-size: 16px;
  font-weight: 600;
  border-radius: 4px;
  border: 1px solid var(--primary-color);
  transition: all 0.2s ease;
}

.btn-secondary:hover {
  background-color: var(--alt-bg);
  color: var(--primary-color);
}

/* Hero Bottom: 横向网络资料索引 */
.hero-bottom-index {
  margin-top: 2rem;
  background-color: var(--card-bg);
  border: 1px solid var(--card-border);
  border-top: 3px solid var(--accent-color);
  padding: 1.5rem;
  border-radius: 4px;
}

.index-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px dashed var(--card-border);
}

.index-title {
  font-family: var(--font-heading);
  font-size: 16px;
  font-weight: 700;
  color: var(--primary-color);
  letter-spacing: 0.5px;
}

.index-meta {
  font-size: 13px;
  color: var(--accent-color);
}

.index-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.2rem;
}

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

.index-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.index-label {
  font-size: 13px;
  color: var(--muted-text);
}

.index-value {
  font-size: 15px;
  font-weight: 600;
  color: var(--primary-color);
}

/* Standard Section Layout */
.section {
  padding: 4rem 0;
  border-bottom: 1px solid var(--card-border);
}

.section-subtitle {
  font-size: 16px;
  color: var(--muted-text);
  margin-top: 0.5rem;
  margin-bottom: 2.5rem;
}

/* Three Core Advantages */
.advantages-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

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

.adv-card {
  background-color: var(--card-bg);
  border: 1px solid var(--card-border);
  padding: 2rem 1.5rem;
  border-radius: 4px;
  position: relative;
}

.adv-number {
  font-family: var(--font-heading);
  font-size: 32px;
  font-weight: 700;
  color: var(--accent-color);
  margin-bottom: 1rem;
}

/* Global Nodes (两列地区档案) */
.nodes-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

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

.node-archive-card {
  background-color: var(--card-bg);
  border: 1px solid var(--card-border);
  border-left: 4px solid var(--primary-color);
  padding: 1.5rem;
  border-radius: 4px;
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
}

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

.node-region {
  font-family: var(--font-heading);
  font-size: 20px;
  font-weight: 700;
  color: var(--primary-color);
}

.node-tag {
  font-size: 12px;
  padding: 2px 8px;
  background-color: var(--alt-bg);
  color: var(--accent-color);
  border: 1px solid var(--card-border);
  border-radius: 3px;
}

/* AI & Streaming Coverage */
.scenarios-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

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

.scenario-card {
  background-color: var(--card-bg);
  border: 1px solid var(--card-border);
  padding: 1.8rem;
  border-radius: 4px;
}

.tags-wrapper {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 1rem 0;
}

.tech-tag {
  font-size: 13px;
  padding: 4px 10px;
  background-color: var(--alt-bg);
  color: var(--primary-color);
  border-radius: 3px;
  border: 1px solid var(--card-border);
}

.disclaimer-box {
  margin-top: 2rem;
  padding: 1rem 1.2rem;
  background-color: var(--alt-bg);
  border-left: 3px solid var(--accent-color);
  font-size: 14px;
  color: var(--muted-text);
}

/* Pricing Section (纵向对照清单) */
.pricing-vertical-list {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  max-width: 860px;
  margin: 0 auto;
}

.price-item {
  background-color: var(--card-bg);
  border: 1px solid var(--card-border);
  padding: 1.8rem;
  border-radius: 4px;
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
  position: relative;
}

@media (min-width: 768px) {
  .price-item {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
}

.price-item.featured {
  border: 2px solid var(--accent-color);
  background-color: #FFFDF9;
}

.featured-badge {
  position: absolute;
  top: -12px;
  right: 20px;
  background-color: var(--accent-color);
  color: #FFFFFF;
  font-size: 12px;
  font-weight: 700;
  padding: 2px 10px;
  border-radius: 3px;
  letter-spacing: 0.5px;
}

.price-details {
  flex: 1;
}

.price-amount {
  font-family: var(--font-heading);
  font-size: 32px;
  font-weight: 700;
  color: var(--primary-color);
}

.price-placeholder-note {
  font-size: 13px;
  color: var(--accent-color);
  margin-top: 4px;
  font-style: italic;
}

/* SEO Articles Entrance (编辑目录: 桌面3列, 平板2列, 手机1列) */
.articles-editorial-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.8rem;
}

@media (min-width: 768px) and (max-width: 1023px) {
  .articles-editorial-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

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

.article-toc-card {
  background-color: var(--card-bg);
  border: 1px solid var(--card-border);
  border-top: 3px solid var(--accent-color);
  border-radius: 4px;
  padding: 1.8rem 1.6rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.article-toc-card:hover {
  transform: translateY(-4px);
  border-top-color: var(--primary-color);
  box-shadow: 0 8px 18px rgba(96, 70, 56, 0.08);
}

.article-toc-content {
  padding: 0;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.article-toc-meta {
  font-size: 12px;
  color: var(--accent-color);
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 0.5rem;
}

.article-toc-title {
  font-size: 18px;
  margin-bottom: 0.8rem;
}

.article-toc-desc {
  font-size: 14px;
  color: var(--muted-text);
  margin-bottom: 1.2rem;
  flex: 1;
}

/* Testimonials Block */
.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(--card-bg);
  border: 1px solid var(--card-border);
  padding: 1.8rem;
  border-radius: 4px;
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.testimonial-quote {
  font-size: 15px;
  line-height: 1.7;
  color: var(--text-color);
  font-style: italic;
  margin-bottom: 1.5rem;
}

.testimonial-notice {
  font-size: 12px;
  color: var(--accent-color);
  padding-top: 0.8rem;
  border-top: 1px dashed var(--card-border);
  font-weight: 600;
}

/* Expandable FAQ Accordion */
.faq-accordion {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  max-width: 860px;
  margin: 0 auto;
}

details.faq-item {
  background-color: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 4px;
  padding: 1rem 1.2rem;
  transition: background-color 0.2s ease;
}

details.faq-item[open] {
  background-color: #FFFDF9;
  border-color: var(--accent-color);
}

summary.faq-question {
  font-family: var(--font-heading);
  font-size: 18px;
  font-weight: 700;
  color: var(--primary-color);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

summary.faq-question::-webkit-details-marker {
  display: none;
}

summary.faq-question::after {
  content: "+";
  font-size: 22px;
  color: var(--accent-color);
  transition: transform 0.2s ease;
}

details[open] summary.faq-question::after {
  content: "−";
}

.faq-answer {
  margin-top: 1rem;
  padding-top: 0.8rem;
  border-top: 1px solid var(--card-border);
  font-size: 16px;
  color: var(--text-color);
}

/* Breadcrumbs */
.breadcrumbs {
  padding: 1rem 0;
  font-size: 14px;
  color: var(--muted-text);
  border-bottom: 1px solid var(--card-border);
  margin-bottom: 2rem;
}

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

.breadcrumbs span {
  margin: 0 0.5rem;
  color: var(--card-border);
}

/* Article Detail Page Layout */
.article-container {
  max-width: 840px;
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem 1.5rem;
}

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

.article-header h1 {
  margin-bottom: 1rem;
}

.article-meta-bar {
  display: flex;
  align-items: center;
  gap: 1rem;
  font-size: 14px;
  color: var(--muted-text);
  border-top: 1px solid var(--card-border);
  border-bottom: 1px solid var(--card-border);
  padding: 0.75rem 0;
  margin-top: 1rem;
}

.article-hero-img {
  width: 100%;
  max-height: 400px;
  object-fit: cover;
  border-radius: 4px;
  border: 1px solid var(--card-border);
  margin-bottom: 2rem;
}

.article-body {
  font-size: 17px;
  line-height: 1.8;

  p {
    margin-bottom: 1.5rem;
  }

  h2 {
    margin-top: 2.5rem;
    margin-bottom: 1.2rem;
  }

  h3 {
    margin-top: 1.8rem;
    margin-bottom: 0.8rem;
  }

  ul, ol {
    margin-bottom: 1.5rem;
    padding-left: 1.8rem;
  }

  li {
    margin-bottom: 0.5rem;
  }

  blockquote {
    margin: 1.8rem 0;
    padding: 1.2rem 1.5rem;
    background-color: var(--alt-bg);
    border-left: 4px solid var(--accent-color);
    font-style: italic;
  }
}

.related-articles {
  margin-top: 4rem;
  padding-top: 2rem;
  border-top: 2px solid var(--card-border);
}

.related-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  margin-top: 1rem;
}

@media (min-width: 600px) {
  .related-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.related-card {
  background-color: var(--card-bg);
  border: 1px solid var(--card-border);
  padding: 1rem 1.2rem;
  border-radius: 4px;
}

/* Footer Styling */
.site-footer {
  background-color: #F4EFE6;
  border-top: 1px solid var(--card-border);
  padding: 3.5rem 0 2rem 0;
  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 1fr;
  }
}

.footer-col h4 {
  font-size: 16px;
  margin-bottom: 1rem;
  color: var(--primary-color);
}

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

.footer-col a {
  font-size: 14px;
  color: var(--text-color);
}

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

.footer-bottom {
  border-top: 1px solid var(--card-border);
  padding-top: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  align-items: center;
  justify-content: space-between;
  font-size: 13px;
  color: var(--muted-text);
}

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