:root {
  --primary: #f45b26;
  --primary-rgb: 244, 91, 38;
  --danger: #c21d2b;
  --danger-rgb: 194, 29, 43;
  --success: #147a2e;
  --success-rgb: 20, 122, 46;
  --warning: #7a5200;
  --warning-rgb: 122, 82, 0;
  --link: #006ccf;
  --link-rgb: 0, 108, 207;
  --primary-contrast: #fff;
  --text: #0e0e0e;
  --text-rgb: 14, 14, 14;
  --background: #fff;
  --background-rgb: 255, 255, 255;
  --secondary-background: #fafafa;
  --secondary-background-rgb: 250, 250, 250;
  --focus: #f5f5f5;
  --focus-rgb: 245, 245, 245;
}

[data-theme="dark"] {
  --primary: #f45b26;
  --primary-rgb: 244, 91, 38;
  --danger: #ed2939;
  --danger-rgb: 237, 41, 57;
  --success: #27c840;
  --success-rgb: 39, 200, 64;
  --warning: #f5a623;
  --warning-rgb: 245, 166, 35;
  --link: #0088ff;
  --link-rgb: 0, 136, 255;
  --text: #fafafa;
  --text-rgb: 250, 250, 250;
  --background: #0e0e0e;
  --background-rgb: 14, 14, 14;
  --secondary-background: #171717;
  --secondary-background-rgb: 23, 23, 23;
  --focus: #262626;
  --focus-rgb: 38, 38, 38;
}

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

body {
  margin: 0;
  font-family: Inter, Arial, sans-serif;
  background: var(--background);
  color: var(--text);
  font-size: 15px;
  line-height: 1.65;
  transition: background 0.2s, color 0.2s;
}

a {
  color: var(--link);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

button,
input {
  font: inherit;
}

.support-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  height: 56px;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 32px;
  border-bottom: 1px solid rgba(var(--text-rgb), 0.08);
  background: var(--background);
}

.nav-logo {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-right: 20px;
  color: var(--text);
  font-size: 15px;
  font-weight: 800;
  text-decoration: none;
  flex-shrink: 0;
}

.nav-logo:hover {
  text-decoration: none;
}

.nav-logo-icon {
  width: 28px;
  height: 28px;
  border-radius: 7px;
  display: grid;
  place-items: center;
  overflow: hidden;
}

.nav-logo-icon img {
  width: 25px;
  height: 25px;
  object-fit: contain;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2px;
  flex: 1;
}

.nav-links a {
  color: rgba(var(--text-rgb), 0.65);
  font-size: 14px;
  font-weight: 500;
  padding: 6px 12px;
  border-radius: 7px;
  text-decoration: none;
  transition: background 0.15s, color 0.15s;
}

.nav-links a:hover,
.nav-links a.active {
  background: var(--focus);
  color: var(--text);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-left: auto;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  min-height: 34px;
  border: 0;
  border-radius: 8px;
  padding: 7px 16px;
  color: var(--text);
  font-size: 14px;
  font-weight: 600;
  white-space: nowrap;
  text-decoration: none;
  cursor: pointer;
}

.btn:hover {
  opacity: 0.88;
  text-decoration: none;
}

.btn-ghost {
  background: transparent;
  border: 1px solid rgba(var(--text-rgb), 0.15);
}

.btn-primary {
  background: var(--primary);
  color: var(--primary-contrast);
}

.btn-sm {
  min-height: 32px;
  padding: 5px 12px;
  font-size: 13px;
}

.theme-toggle {
  width: 34px;
  height: 34px;
  border: 1px solid rgba(var(--text-rgb), 0.12);
  border-radius: 8px;
  display: grid;
  place-items: center;
  background: transparent;
  color: var(--text);
  cursor: pointer;
}

.theme-toggle:hover {
  background: var(--focus);
}

.theme-toggle svg {
  width: 16px;
  height: 16px;
}

.support-loading,
.support-error,
.support-empty {
  max-width: 760px;
  margin: 64px auto;
  padding: 24px;
  border: 1px solid rgba(var(--text-rgb), 0.08);
  border-radius: 12px;
  background: var(--secondary-background);
  text-align: center;
}

.hero {
  position: relative;
  z-index: 5;
  overflow: visible;
  padding: 72px 32px 64px;
  background:
    radial-gradient(ellipse 80% 60% at 50% 0%, rgba(var(--primary-rgb), 0.08), transparent 70%),
    linear-gradient(135deg, rgba(var(--primary-rgb), 0.12), rgba(var(--text-rgb), 0.04) 50%, rgba(var(--primary-rgb), 0.06));
  text-align: center;
}

.hero h1 {
  position: relative;
  margin: 0 0 14px;
  font-size: clamp(28px, 5vw, 44px);
  font-weight: 800;
  letter-spacing: -0.02em;
}

.hero h1 span {
  color: var(--primary);
}

.hero p {
  position: relative;
  max-width: 520px;
  margin: 0 auto 32px;
  color: rgba(var(--text-rgb), 0.6);
  font-size: 16px;
}

.search-wrap {
  position: relative;
  z-index: 20;
  max-width: 560px;
  margin: 0 auto;
}

.search-wrap input {
  width: 100%;
  height: 52px;
  border: 1.5px solid rgba(var(--text-rgb), 0.12);
  border-radius: 14px;
  background: var(--background);
  color: var(--text);
  padding: 0 78px 0 48px;
  font-size: 15px;
  box-shadow: 0 8px 32px rgba(var(--text-rgb), 0.08);
  outline: none;
}

.search-wrap input:focus {
  border-color: var(--primary);
  box-shadow: 0 8px 32px rgba(var(--primary-rgb), 0.16);
}

.search-icon {
  position: absolute;
  top: 50%;
  left: 17px;
  z-index: 1;
  color: rgba(var(--text-rgb), 0.45);
  transform: translateY(-50%);
}

.search-kbd {
  position: absolute;
  top: 50%;
  right: 14px;
  border-radius: 6px;
  background: var(--focus);
  color: rgba(var(--text-rgb), 0.45);
  padding: 3px 7px;
  font-size: 12px;
  transform: translateY(-50%);
}

.search-results {
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  right: 0;
  z-index: 1000;
  display: none;
  overflow: hidden;
  border: 1.5px solid rgba(var(--text-rgb), 0.1);
  border-radius: 12px;
  background: var(--background);
  box-shadow: 0 8px 32px rgba(var(--text-rgb), 0.12);
  text-align: left;
}

.search-results.visible {
  display: block;
}

.search-result-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 12px 16px;
  color: var(--text);
  text-decoration: none;
}

.search-result-item:hover {
  background: var(--focus);
  text-decoration: none;
}

.search-result-icon,
.category-icon,
.article-category,
.related-card-icon {
  color: var(--primary);
  background: rgba(var(--primary-rgb), 0.1);
}

.search-result-icon {
  width: 30px;
  height: 30px;
  border-radius: 7px;
  display: grid;
  place-items: center;
  flex-shrink: 0;
}

.search-result-icon svg {
  width: 15px;
  height: 15px;
}

.search-result-text strong {
  display: block;
  color: var(--text);
  font-size: 13.5px;
  font-weight: 700;
}

.search-result-text span,
.search-no-result {
  color: rgba(var(--text-rgb), 0.5);
  font-size: 12px;
}

.search-no-result {
  padding: 16px;
  text-align: center;
}

.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 32px;
}

.section {
  padding: 56px 0;
  border-bottom: 1px solid rgba(var(--text-rgb), 0.07);
}

.section-header {
  margin-bottom: 24px;
}

.section-header h2 {
  margin: 0 0 6px;
  font-size: 22px;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.section-header p {
  margin: 0;
  color: rgba(var(--text-rgb), 0.58);
}

.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px;
}

.category-card,
.article-card,
.related-card {
  border: 1.5px solid rgba(var(--text-rgb), 0.08);
  border-radius: 12px;
  background: var(--background);
  color: var(--text);
  text-decoration: none;
  transition: border-color 0.15s, background 0.15s, transform 0.15s;
}

.category-card {
  min-height: 160px;
  padding: 18px;
}

.category-card:hover,
.article-card:hover,
.related-card:hover {
  border-color: var(--primary);
  background: rgba(var(--primary-rgb), 0.04);
  text-decoration: none;
  transform: translateY(-1px);
}

.category-icon {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  display: grid;
  place-items: center;
  margin-bottom: 14px;
}

.category-icon svg {
  width: 19px;
  height: 19px;
}

.category-card h3,
.article-card h3 {
  margin: 0 0 7px;
  color: var(--text);
  font-size: 15px;
}

.category-card p,
.article-card p {
  margin: 0;
  color: rgba(var(--text-rgb), 0.58);
  font-size: 13px;
  line-height: 1.5;
}

.article-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.article-card {
  display: grid;
  grid-template-columns: 36px 1fr;
  gap: 12px;
  padding: 16px;
}

.article-card svg {
  width: 18px;
  height: 18px;
  margin-top: 2px;
  color: var(--primary);
}

.cta-section {
  text-align: center;
  padding: 64px 32px;
  border-top: 1px solid rgba(var(--text-rgb), 0.07);
}

.cta-icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: var(--primary);
  color: #fff;
  display: grid;
  place-items: center;
  margin: 0 auto 20px;
}

.cta-section h2 {
  margin: 0 0 8px;
  font-size: clamp(20px, 4vw, 28px);
  font-weight: 800;
}

.cta-section p {
  margin: 0 0 24px;
  color: rgba(var(--text-rgb), 0.55);
}

.breadcrumb-bar {
  border-bottom: 1px solid rgba(var(--text-rgb), 0.07);
  background: var(--secondary-background);
  padding: 10px 32px;
}

.breadcrumb {
  max-width: 960px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 6px;
  color: rgba(var(--text-rgb), 0.5);
  font-size: 13px;
}

.breadcrumb a {
  color: rgba(var(--text-rgb), 0.5);
}

.breadcrumb-current {
  color: var(--text);
  font-weight: 600;
}

.layout {
  max-width: 960px;
  margin: 0 auto;
  padding: 40px 32px;
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 48px;
  align-items: start;
}

.sidebar {
  position: sticky;
  top: 76px;
}

.sidebar-section {
  margin-bottom: 28px;
}

.sidebar-title,
.toc-title {
  margin-bottom: 8px;
  color: rgba(var(--text-rgb), 0.4);
  font-size: 11.5px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.sidebar-link {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 1px;
  border-radius: 7px;
  color: rgba(var(--text-rgb), 0.65);
  padding: 6px 10px;
  font-size: 13.5px;
  text-decoration: none;
}

.sidebar-link:hover,
.sidebar-link.active {
  background: var(--focus);
  color: var(--text);
  text-decoration: none;
}

.sidebar-link.active {
  background: rgba(var(--primary-rgb), 0.1);
  color: var(--primary);
  font-weight: 700;
}

.sidebar-link svg {
  width: 14px;
  height: 14px;
  flex-shrink: 0;
}

.toc {
  border-left: 2px solid rgba(var(--text-rgb), 0.08);
  padding-left: 14px;
}

.toc-link {
  display: block;
  margin: 6px 0;
  color: rgba(var(--text-rgb), 0.55);
  font-size: 13px;
  line-height: 1.4;
}

.toc-link.active {
  color: var(--primary);
  font-weight: 700;
}

.toc-link.level-3 {
  padding-left: 12px;
}

.article-header {
  margin-bottom: 36px;
}

.article-category {
  width: fit-content;
  min-height: 24px;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 14px;
  padding: 4px 10px;
  font-size: 12px;
  font-weight: 700;
}

.article-category svg {
  width: 12px;
  height: 12px;
}

.article-title {
  margin: 0 0 12px;
  font-size: clamp(30px, 5vw, 44px);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
}

.article-description {
  max-width: 680px;
  margin: 0 0 16px;
  color: rgba(var(--text-rgb), 0.62);
  font-size: 16px;
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  color: rgba(var(--text-rgb), 0.48);
  font-size: 13px;
}

.meta-item {
  display: inline-flex;
  align-items: center;
  gap: 5px;
}

.meta-item svg {
  width: 13px;
  height: 13px;
}

.article-divider {
  height: 1px;
  margin-bottom: 34px;
  background: rgba(var(--text-rgb), 0.08);
}

.article-content h1,
.article-content h2,
.article-content h3,
.article-content h4 {
  color: var(--text);
  font-weight: 800;
  letter-spacing: -0.02em;
}

.article-content h1 {
  margin: 38px 0 16px;
  font-size: 30px;
}

.article-content h2 {
  margin: 34px 0 14px;
  font-size: 24px;
}

.article-content h3 {
  margin: 26px 0 10px;
  font-size: 18px;
}

.article-content p,
.article-content ul,
.article-content ol,
.support-table-wrap,
.article-content pre {
  margin: 0 0 18px;
}

.article-content p,
.article-content li {
  color: rgba(var(--text-rgb), 0.76);
}

.article-content ul,
.article-content ol {
  padding-left: 22px;
}

.article-content li + li {
  margin-top: 6px;
}

.article-content code {
  border-radius: 5px;
  background: var(--focus);
  color: var(--primary);
  padding: 2px 5px;
  font-family: "JetBrains Mono", Consolas, monospace;
  font-size: 0.92em;
}

.article-content pre {
  overflow: auto;
  border: 1px solid rgba(var(--text-rgb), 0.08);
  border-radius: 12px;
  background: #111;
  color: #f7f7f7;
  padding: 16px;
}

.article-content pre code {
  background: transparent;
  color: inherit;
  padding: 0;
}

.support-table-wrap {
  overflow-x: auto;
  border: 1px solid rgba(var(--text-rgb), 0.08);
  border-radius: 10px;
}

.article-content table {
  width: 100%;
  border-collapse: collapse;
  min-width: 520px;
}

.article-content th,
.article-content td {
  border-bottom: 1px solid rgba(var(--text-rgb), 0.08);
  padding: 10px 12px;
  text-align: left;
}

.article-content th {
  background: var(--secondary-background);
  color: var(--text);
  font-size: 13px;
}

.article-content tr:last-child td {
  border-bottom: 0;
}

.article-footer {
  margin-top: 48px;
  padding-top: 28px;
  border-top: 1px solid rgba(var(--text-rgb), 0.08);
}

.helpful-row {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.helpful-label {
  color: rgba(var(--text-rgb), 0.6);
  font-size: 14px;
}

.helpful-btn {
  min-height: 34px;
  border: 1.5px solid rgba(var(--text-rgb), 0.12);
  border-radius: 8px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: transparent;
  color: var(--text);
  padding: 7px 14px;
  cursor: pointer;
}

.helpful-btn:hover,
.helpful-btn.selected {
  border-color: var(--primary);
  background: rgba(var(--primary-rgb), 0.06);
  color: var(--primary);
}

.related-title {
  margin: 32px 0 12px;
  font-size: 16px;
}

.related-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.related-card {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
}

.related-card-icon {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  display: grid;
  place-items: center;
  flex-shrink: 0;
}

.related-card-icon svg {
  width: 16px;
  height: 16px;
}

.related-card-title {
  color: var(--text);
  font-size: 13.5px;
  font-weight: 700;
  line-height: 1.3;
}

.related-card-desc {
  margin-top: 2px;
  color: rgba(var(--text-rgb), 0.5);
  font-size: 12px;
}

footer {
  border-top: 1px solid rgba(var(--text-rgb), 0.07);
  background: var(--secondary-background);
  padding: 52px 32px 32px;
}

.footer-grid {
  max-width: 860px;
  margin: 0 auto 40px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
}

.footer-col-title {
  margin-bottom: 14px;
  color: rgba(var(--text-rgb), 0.45);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.footer-col a {
  display: block;
  margin-bottom: 9px;
  color: rgba(var(--text-rgb), 0.7);
  font-size: 13.5px;
}

.footer-bottom {
  max-width: 860px;
  margin: 0 auto;
  border-top: 1px solid rgba(var(--text-rgb), 0.07);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-top: 24px;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text);
  font-size: 14px;
  font-weight: 800;
}

.footer-logo img {
  width: 24px;
  height: 24px;
}

.footer-copy {
  color: rgba(var(--text-rgb), 0.4);
  font-size: 12.5px;
}

@media (max-width: 760px) {
  .support-nav {
    height: auto;
    min-height: 56px;
    flex-wrap: wrap;
    padding: 10px 16px;
  }

  .nav-links {
    order: 3;
    width: 100%;
    overflow-x: auto;
  }

  .nav-actions {
    margin-left: auto;
  }

  .nav-actions .btn-ghost {
    display: none;
  }

  .hero {
    padding: 52px 16px 48px;
  }

  .container {
    padding: 0 16px;
  }

  .article-list,
  .related-grid {
    grid-template-columns: 1fr;
  }

  .breadcrumb-bar {
    padding: 10px 16px;
  }

  .layout {
    grid-template-columns: 1fr;
    padding: 28px 16px;
    gap: 0;
  }

  .sidebar {
    display: none;
  }

  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-bottom {
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (max-width: 440px) {
  .category-grid,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .search-kbd {
    display: none;
  }

  .search-wrap input {
    padding-right: 18px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    transition: none !important;
  }
}