:root {
  --support-bg: #f8f9fa;
  --support-surface: #fff;
  --support-text: #202124;
  --support-muted: #5f6368;
  --support-border: #dadce0;
  --support-link: #1a73e8;
  --support-link-hover: #174ea6;
  --support-accent: #d32f2f;
  --support-sidebar-w: 300px;
  --support-max: 1120px;
  --support-radius: 12px;
  --support-read-max: 720px;

  /* Typography — Google Help / Material scale */
  --support-font: "Roboto", "Noto Sans KR", system-ui, -apple-system, sans-serif;
  --support-text-xs: 0.75rem; /* 12px */
  --support-text-sm: 0.875rem; /* 14px */
  --support-text-md: 1rem; /* 16px */
  --support-text-lg: 1.125rem; /* 18px */
  --support-text-xl: 1.375rem; /* 22px */
  --support-text-2xl: 1.75rem; /* 28px */
  --support-text-3xl: 2.25rem; /* 36px */
  --support-line-body: 1.625;
  --support-line-tight: 1.333;
  --support-line-snug: 1.4;
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  margin: 0;
  color: var(--support-text);
  background: var(--support-bg);
  font-family: var(--support-font);
  font-size: var(--support-text-md);
  font-weight: 400;
  line-height: var(--support-line-body);
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a:hover {
  text-decoration: underline;
  color: var(--support-link-hover);
}

.support-header {
  background: var(--support-surface);
  border-bottom: 1px solid var(--support-border);
  position: sticky;
  top: 0;
  z-index: 20;
}

.support-header-inner {
  max-width: calc(var(--support-max) + 48px);
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.support-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: inherit;
  text-decoration: none;
  font-weight: 500;
  font-size: var(--support-text-md);
  letter-spacing: 0;
}

.support-brand:hover {
  text-decoration: none;
  color: inherit;
}

.support-brand-mark {
  width: 32px;
  height: 32px;
}

.support-brand-sub {
  font-weight: 400;
  color: var(--support-muted);
  font-size: var(--support-text-sm);
}

.support-header-actions {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 10px;
}

.support-search-wrap {
  flex: 1 1 240px;
  max-width: 420px;
  min-width: 180px;
}

.support-search {
  width: 100%;
  padding: 10px 14px 10px 38px;
  border: 1px solid var(--support-border);
  border-radius: 999px;
  font-family: inherit;
  font-size: var(--support-text-sm);
  line-height: 1.4;
  background: var(--support-bg) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='18' height='18' fill='none' stroke='%235f6368' stroke-width='2'%3E%3Ccircle cx='8' cy='8' r='5.5'/%3E%3Cpath d='M12.5 12.5L16 16'/%3E%3C/svg%3E") 12px center no-repeat;
}

.support-search:focus {
  outline: 2px solid rgba(26, 115, 232, 0.35);
  border-color: var(--support-link);
  background-color: #fff;
}

.support-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border-radius: 999px;
  border: 1px solid var(--support-border);
  background: #fff;
  color: var(--support-text);
  font-family: inherit;
  font-size: var(--support-text-sm);
  font-weight: 500;
  line-height: 1.4;
  cursor: pointer;
  text-decoration: none;
}

.support-btn:hover {
  background: var(--support-bg);
  text-decoration: none;
  color: var(--support-text);
}

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

.support-btn-primary:hover {
  background: #b71c1c;
  border-color: #b71c1c;
  color: #fff;
}

.support-hero {
  margin: 0 0 28px;
  padding: 8px 0 4px;
  max-width: var(--support-read-max);
}

.support-hero h1 {
  margin: 0 0 12px;
  font-size: clamp(var(--support-text-2xl), 3.2vw, var(--support-text-3xl));
  font-weight: 400;
  line-height: var(--support-line-tight);
  letter-spacing: -0.02em;
  color: var(--support-text);
}

.support-hero p {
  margin: 0;
  color: var(--support-muted);
  max-width: 640px;
  font-size: var(--support-text-md);
  line-height: var(--support-line-body);
}

.support-home-block {
  margin-bottom: 28px;
}

.support-home-block h3 {
  margin: 0 0 14px;
  font-size: var(--support-text-sm);
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--support-muted);
}

.support-layout {
  max-width: calc(var(--support-max) + 48px);
  margin: 0 auto;
  padding: 24px 24px 56px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) var(--support-sidebar-w);
  gap: 40px;
  align-items: start;
}

.support-main {
  min-width: 0;
  min-height: calc(100vh - 88px);
}

.support-article {
  background: var(--support-surface);
  border: 1px solid var(--support-border);
  border-radius: var(--support-radius);
  padding: 32px 40px 40px;
}

.support-article[hidden] {
  display: none !important;
}

.support-article h2 {
  margin: 0 0 20px;
  max-width: var(--support-read-max);
  font-size: var(--support-text-xl);
  font-weight: 400;
  line-height: var(--support-line-tight);
  letter-spacing: -0.01em;
  color: var(--support-text);
}

.support-article h3 {
  margin: 32px 0 12px;
  max-width: var(--support-read-max);
  font-size: var(--support-text-lg);
  font-weight: 500;
  line-height: var(--support-line-snug);
  letter-spacing: 0;
  color: var(--support-text);
}

.support-article p {
  margin: 0 0 16px;
  max-width: var(--support-read-max);
  font-size: var(--support-text-md);
  line-height: var(--support-line-body);
}

.support-article ul,
.support-article ol {
  margin: 0 0 20px;
  padding-left: 1.5rem;
  max-width: var(--support-read-max);
  font-size: var(--support-text-md);
  line-height: var(--support-line-body);
}

.support-article li {
  margin-bottom: 10px;
}

.support-article li:last-child {
  margin-bottom: 0;
}

.support-article li ul,
.support-article li ol {
  margin-top: 10px;
  margin-bottom: 0;
}

.support-article strong {
  font-weight: 500;
  color: var(--support-text);
}

.support-article code {
  padding: 2px 6px;
  border-radius: 4px;
  background: #f1f3f4;
  font-family: "Roboto Mono", ui-monospace, "Cascadia Code", monospace;
  font-size: 0.9em;
  color: #174ea6;
}

.support-figures {
  display: flex;
  flex-direction: column;
  gap: 24px;
  margin: 0 0 28px;
}

.support-figure {
  margin: 0;
  border: 1px solid var(--support-border);
  border-radius: 10px;
  overflow: hidden;
  background: #f8f9fa;
}

.support-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  vertical-align: top;
  border-bottom: 1px solid var(--support-border);
}

.support-figure img.support-img-missing {
  min-height: 160px;
  object-fit: contain;
  padding: 24px;
  background: repeating-linear-gradient(
    -45deg,
    #f1f3f4,
    #f1f3f4 8px,
    #e8eaed 8px,
    #e8eaed 16px
  );
  opacity: 0.85;
}

.support-figure figcaption {
  padding: 12px 16px;
  font-size: var(--support-text-sm);
  color: var(--support-muted);
  line-height: var(--support-line-snug);
  background: #fff;
}

.support-figure-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 20px;
  margin: 0 0 28px;
}

.support-figure-grid .support-figure {
  margin: 0;
}

.support-note {
  margin: 24px 0;
  padding: 16px 18px;
  max-width: var(--support-read-max);
  border-radius: 8px;
  background: #e8f0fe;
  border-left: 4px solid var(--support-link);
  font-size: var(--support-text-md);
  line-height: var(--support-line-body);
}

.support-note strong {
  display: block;
  margin-bottom: 6px;
  font-weight: 500;
}

.support-kbd {
  display: inline-block;
  padding: 2px 7px;
  border: 1px solid var(--support-border);
  border-radius: 4px;
  background: #f1f3f4;
  font-size: 0.875em;
  font-family: "Roboto Mono", ui-monospace, monospace;
}

.support-steps {
  counter-reset: step;
  list-style: none;
  padding: 0;
  margin: 0 0 24px;
  max-width: var(--support-read-max);
}

.support-steps li {
  counter-increment: step;
  position: relative;
  padding: 0 0 20px 48px;
  margin: 0;
  font-size: var(--support-text-md);
  line-height: var(--support-line-body);
}

.support-steps li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: 2px;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: #e8f0fe;
  color: var(--support-link);
  font-weight: 500;
  font-size: var(--support-text-sm);
  display: flex;
  align-items: center;
  justify-content: center;
}

.support-table {
  width: 100%;
  max-width: var(--support-read-max);
  border-collapse: collapse;
  margin: 20px 0 24px;
  font-size: var(--support-text-sm);
  line-height: var(--support-line-snug);
}

.support-table th,
.support-table td {
  border: 1px solid var(--support-border);
  padding: 12px 14px;
  text-align: left;
  vertical-align: top;
}

.support-table th {
  background: #f8f9fa;
  font-weight: 500;
  color: var(--support-text);
}

.support-sidebar {
  position: sticky;
  top: 68px;
  max-height: calc(100vh - 80px);
  overflow: auto;
}

.support-sidebar-card {
  background: var(--support-surface);
  border: 1px solid var(--support-border);
  border-radius: var(--support-radius);
  padding: 16px 0 8px;
}

.support-sidebar-title {
  margin: 0 16px 12px;
  font-family: var(--support-font);
  font-size: var(--support-text-sm);
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  line-height: var(--support-line-snug);
  color: var(--support-muted);
}

.support-nav-section {
  list-style: none;
}

.support-nav-section .support-sidebar-title {
  margin: 20px 16px 10px;
  padding-top: 4px;
}

.support-nav-section:first-child .support-sidebar-title {
  margin-top: 4px;
}

.support-nav {
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--support-font);
}

.support-nav a {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 11px 16px;
  color: var(--support-text);
  text-decoration: none;
  font-family: inherit;
  font-size: var(--support-text-md);
  font-weight: 400;
  line-height: var(--support-line-body);
  letter-spacing: 0.01em;
  border-left: 3px solid transparent;
}

.support-nav a:hover {
  background: #f1f3f4;
  text-decoration: none;
}

.support-nav a.active {
  background: #e8f0fe;
  border-left-color: var(--support-link);
  color: var(--support-link);
  font-weight: 500;
}

.support-nav-icon {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  margin-top: 3px;
  opacity: 0.55;
}

.support-nav a.active .support-nav-icon {
  opacity: 1;
}

.support-topic-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 16px;
  margin-top: 4px;
}

.support-topic-card {
  display: block;
  padding: 20px 18px;
  border: 1px solid var(--support-border);
  border-radius: 10px;
  background: #fff;
  color: inherit;
  text-decoration: none;
  transition: box-shadow 0.15s, border-color 0.15s;
}

.support-topic-card:hover {
  border-color: #bdc1c6;
  box-shadow: 0 2px 8px rgba(60, 64, 67, 0.12);
  text-decoration: none;
  color: inherit;
}

.support-topic-card strong {
  display: block;
  margin-bottom: 6px;
  font-size: var(--support-text-md);
  font-weight: 500;
  line-height: var(--support-line-snug);
}

.support-topic-card span {
  color: var(--support-muted);
  font-size: var(--support-text-sm);
  line-height: var(--support-line-snug);
}

.support-footer {
  max-width: calc(var(--support-max) + 48px);
  margin: 0 auto;
  padding: 0 24px 40px;
  color: var(--support-muted);
  font-size: var(--support-text-sm);
  line-height: var(--support-line-snug);
}

.support-empty {
  padding: 32px;
  text-align: center;
  color: var(--support-muted);
  font-size: var(--support-text-sm);
}

@media (max-width: 900px) {
  .support-layout {
    grid-template-columns: 1fr;
    padding-top: 16px;
    gap: 28px;
  }

  .support-sidebar {
    position: static;
    max-height: none;
    overflow: visible;
  }

  .support-article {
    padding: 24px 20px 32px;
  }

  .support-hero h1 {
    font-size: var(--support-text-2xl);
  }
}