/* ===== Reset & Base ===== */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  color: #1a1a2e;
  background: #f5f6fa;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a {
  text-decoration: none;
  color: inherit;
}

ul, ol {
  list-style: none;
}

img {
  max-width: 100%;
  display: block;
}

/* ===== Top Header Bar ===== */
.top-header {
  background: #fff;
  border-bottom: 1px solid #e8e8e8;
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.06);
}

.top-header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 4px;
}

.logo svg {
  height: 30px;
  width: auto;
}

.logo-text {
  font-size: 22px;
  font-weight: 800;
  color: #0064d2;
  letter-spacing: -0.5px;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 6px;
}

.header-link {
  font-size: 13px;
  font-weight: 500;
  color: #555;
  padding: 8px 14px;
  border-radius: 8px;
  transition: all 0.2s ease;
}

.header-link:hover {
  background: #f0f6ff;
  color: #0064d2;
}

.header-divider {
  width: 1px;
  height: 20px;
  background: #ddd;
  margin: 0 4px;
}

.btn-login {
  font-size: 13px;
  font-weight: 600;
  color: #0064d2;
  padding: 8px 20px;
  border: 2px solid #0064d2;
  border-radius: 8px;
  transition: all 0.2s ease;
  cursor: pointer;
  background: transparent;
}

.btn-login:hover {
  background: #0064d2;
  color: #fff;
}

/* ===== Service Navigation ===== */
.service-nav {
  background: #fff;
  border-bottom: 1px solid #e8e8e8;
  overflow-x: auto;
}

.service-nav::-webkit-scrollbar {
  display: none;
}

.service-nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  gap: 4px;
  height: 56px;
}

.service-item {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 500;
  color: #555;
  white-space: nowrap;
  transition: all 0.2s ease;
  cursor: pointer;
}

.service-item:hover {
  background: #f0f6ff;
  color: #0064d2;
}

.service-item svg,
.service-item .service-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

.service-icon {
  font-size: 16px;
}

/* ===== Breadcrumbs ===== */
.breadcrumbs {
  max-width: 1200px;
  margin: 0 auto;
  padding: 16px 24px;
}

.breadcrumbs-list {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: #888;
}

.breadcrumbs-list a {
  color: #0064d2;
  font-weight: 500;
  transition: color 0.2s;
}

.breadcrumbs-list a:hover {
  color: #004fa3;
  text-decoration: underline;
}

.breadcrumbs-list .sep {
  color: #bbb;
}

/* ===== Main Content Layout ===== */
.main-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px 40px;
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 40px;
  align-items: start;
}

/* ===== Article ===== */
.article {
  background: #fff;
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
}

.article-header {
  padding: 32px 36px 0;
}

.article-title {
  font-size: 30px;
  font-weight: 800;
  line-height: 1.3;
  color: #1a1a2e;
  margin-bottom: 16px;
}

.article-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 20px;
  border-bottom: 1px solid #eee;
  margin-bottom: 24px;
}

.meta-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

.author-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, #0064d2, #00a1ff);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 700;
  font-size: 14px;
}

.author-info {
  display: flex;
  flex-direction: column;
}

.author-name {
  font-size: 14px;
  font-weight: 600;
  color: #1a1a2e;
}

.meta-details {
  font-size: 13px;
  color: #888;
  display: flex;
  align-items: center;
  gap: 8px;
}

.meta-details .dot {
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: #bbb;
}

.share-buttons {
  display: flex;
  gap: 8px;
}

.share-btn {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1px solid #ddd;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s;
  background: #fff;
  color: #555;
}

.share-btn:hover {
  border-color: #0064d2;
  color: #0064d2;
  background: #f0f6ff;
}

/* Hero Image */
.hero-image {
  padding: 0 36px;
  margin-bottom: 28px;
}

.hero-image img {
  width: 100%;
  border-radius: 12px;
  display: block;
}

.image-caption {
  font-size: 12px;
  color: #888;
  text-align: center;
  margin-top: 8px;
  font-style: italic;
}

/* Article Body */
.article-body {
  padding: 0 36px 40px;
}

.article-body p {
  font-size: 15px;
  line-height: 1.8;
  color: #333;
  margin-bottom: 20px;
}

.article-body a {
  color: #0064d2;
  font-weight: 500;
  transition: color 0.2s;
}

.article-body a:hover {
  color: #004fa3;
  text-decoration: underline;
}

.article-body h2 {
  font-size: 22px;
  font-weight: 700;
  color: #1a1a2e;
  margin-top: 36px;
  margin-bottom: 16px;
  padding-top: 24px;
  border-top: 1px solid #f0f0f0;
}

.article-body h2:first-child {
  margin-top: 0;
  border-top: none;
  padding-top: 0;
}

.section-image {
  margin: 20px 0;
  border-radius: 12px;
  overflow: hidden;
  position: relative;
}

.section-image img {
  width: 100%;
  display: block;
  border-radius: 12px;
  transition: transform 0.3s ease;
}

.section-image:hover img {
  transform: scale(1.01);
}

.section-image .image-caption {
  margin-top: 8px;
}

.read-also {
  background: #f0f6ff;
  border-left: 4px solid #0064d2;
  padding: 14px 18px;
  border-radius: 0 8px 8px 0;
  margin: 20px 0;
  font-size: 14px;
}

.read-also span {
  font-weight: 600;
  color: #1a1a2e;
}

.read-also a {
  color: #0064d2;
  font-weight: 500;
}

/* Tips List */
.tips-list {
  padding-left: 20px;
  margin: 16px 0 20px;
  list-style: decimal;
}

.tips-list li {
  font-size: 15px;
  color: #333;
  line-height: 1.8;
  margin-bottom: 6px;
  padding-left: 4px;
}

/* ===== Sidebar ===== */
.sidebar {
  position: sticky;
  top: 140px;
}

.toc-card {
  background: #fff;
  border-radius: 16px;
  padding: 24px;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
}

.toc-title {
  font-size: 16px;
  font-weight: 700;
  color: #1a1a2e;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 2px solid #0064d2;
}

.toc-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.toc-list a {
  display: block;
  padding: 10px 12px;
  font-size: 14px;
  color: #555;
  border-radius: 8px;
  transition: all 0.2s ease;
  font-weight: 500;
  border-left: 3px solid transparent;
}

.toc-list a:hover,
.toc-list a.active {
  background: #f0f6ff;
  color: #0064d2;
  border-left-color: #0064d2;
}

/* ===== Footer ===== */
.footer {
  background: #1a1a2e;
  color: #ccc;
  margin-top: 60px;
}

.footer-top {
  max-width: 1200px;
  margin: 0 auto;
  padding: 48px 24px 32px;
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 40px;
}

.footer-brand .logo-text {
  color: #fff;
  font-size: 24px;
  margin-bottom: 12px;
}

.footer-brand p {
  font-size: 13px;
  line-height: 1.7;
  color: #999;
}

.footer-social {
  display: flex;
  gap: 10px;
  margin-top: 16px;
}

.social-icon {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.08);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ccc;
  font-size: 14px;
  transition: all 0.2s;
  cursor: pointer;
}

.social-icon:hover {
  background: #0064d2;
  color: #fff;
}

.footer-col h4 {
  font-size: 14px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 16px;
}

.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-col ul li a,
.footer-col ul li span {
  font-size: 13px;
  color: #999;
  transition: color 0.2s;
}

.footer-col ul li a:hover {
  color: #0064d2;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.footer-bottom p {
  font-size: 12px;
  color: #666;
}

.footer-bottom-links {
  display: flex;
  gap: 20px;
}

.footer-bottom-links a {
  font-size: 12px;
  color: #666;
  transition: color 0.2s;
}

.footer-bottom-links a:hover {
  color: #0064d2;
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .main-container {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
    order: -1;
  }

  .toc-card {
    margin-bottom: 0;
  }
}

@media (max-width: 768px) {
  .top-header-inner {
    height: 56px;
    padding: 0 16px;
  }

  .header-right {
    gap: 2px;
  }

  .header-link {
    font-size: 12px;
    padding: 6px 8px;
  }

  .header-link.hide-mobile {
    display: none;
  }

  .service-nav-inner {
    padding: 0 16px;
  }

  .breadcrumbs {
    padding: 12px 16px;
  }

  .main-container {
    padding: 0 16px 32px;
    gap: 24px;
  }

  .article-header {
    padding: 24px 20px 0;
  }

  .article-title {
    font-size: 22px;
  }

  .article-meta {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }

  .hero-image {
    padding: 0 20px;
  }

  .article-body {
    padding: 0 20px 32px;
  }

  .article-body h2 {
    font-size: 19px;
  }

  .footer-top {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
    padding: 32px 16px 24px;
  }

  .footer-bottom {
    flex-direction: column;
    gap: 12px;
    text-align: center;
    padding: 16px;
  }
}

@media (max-width: 480px) {
  .logo-text {
    font-size: 18px;
  }

  .footer-top {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .article-title {
    font-size: 20px;
  }
}

/* ===== AR Button ===== */
.btn-ar,
.article-body .btn-ar,
.article-body a.btn-ar {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 12px;
  background: linear-gradient(135deg, #0064d2, #0084ff);
  color: #ffffff !important;
  padding: 12px 22px;
  border-radius: 10px;
  font-weight: 600;
  font-size: 14px;
  transition: all 0.3s ease;
  box-shadow: 0 4px 12px rgba(0, 100, 210, 0.3);
  text-decoration: none !important;
}

.btn-ar:hover,
.article-body .btn-ar:hover,
.article-body a.btn-ar:hover {
  background: linear-gradient(135deg, #004fa3, #0064d2);
  color: #ffffff !important;
  text-decoration: none !important;
  box-shadow: 0 6px 20px rgba(0, 100, 210, 0.4);
  transform: translateY(-2px);
}

.ar-button-wrapper {
  margin-bottom: 24px;
}