* {
  box-sizing: border-box;
}

:root {
  --color-text: #1a1a1a;
  --color-text-secondary: #666666;
  --color-text-light: #999999;
  --color-border: #e0e0e0;
  --color-border-dark: #cccccc;
  --color-bg: #ffffff;
  --color-bg-subtle: #fafafa;
  --color-bg-muted: #f5f5f5;
  --color-accent: #2c3e50;
  --color-accent-light: #34495e;
  --color-accent-hover: #1a252f;
  --line-width: 1px;
  --radius-sm: 2px;
  --radius-md: 4px;
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-xxl: 48px;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "Noto Sans SC", Arial, sans-serif;
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color 0.15s ease;
}

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

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

/* ========== Logo & Header ========== */

.logo-img {
  width: 120px;
  max-width: 100%;
  height: auto;
}

.logo-container {
  text-align: left;
  width: 64px;
  height: 64px;
  max-width: 100%;
  height: auto;
  flex-shrink: 0;
}

.logo-align {
  text-align: center;
}

.logo-align {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
}

.logo-header-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
}

.logo-border {
  color: var(--color-text);
}

.logo-size {
  width: 120px;
  height: auto;
  max-width: 100%;
}

.logo-img-custom {
  text-align: left;
  max-width: 100%;
  height: auto;
}

.logo-size-custom {
  max-width: 100%;
  height: auto;
}

.main-container {
  background-color: var(--color-bg);
  border-bottom: var(--line-width) solid var(--color-border);
  padding: var(--space-xl) var(--space-md);
}

.slogan-container {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-sm) 0;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.slogan-line {
  flex: 1;
  height: 1px;
  background-color: var(--color-border-dark);
  min-width: 40px;
  max-width: 120px;
}

.slogan-line-left {
  width: 60px;
  max-width: 100%;
  border: none;
  margin-right: var(--space-sm);
}

.slogan-line-right {
  width: 60px;
  max-width: 100%;
  border: none;
  margin-left: var(--space-sm);
}

.slogan-text {
  color: var(--color-text-secondary);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.5px;
  white-space: nowrap;
  padding: 0 var(--space-sm);
}

.slogan-container-text {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-secondary);
  font-size: 12px;
  flex-wrap: wrap;
}

.page-title-main {
  text-align: center;
  color: var(--color-text);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-top: var(--space-md);
  padding-top: var(--space-md);
  border-top: var(--line-width) solid var(--color-border);
}

/* ========== Navigation Bar ========== */

.header-row {
  background-color: var(--color-bg-subtle);
  border-bottom: var(--line-width) solid var(--color-border);
  padding: var(--space-sm) var(--space-md);
}

.nav-center {
  text-align: center;
}

.nav-padding {
  padding: var(--space-xs);
}

.nav-title {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--color-text-light);
}

.nav-location {
  color: var(--color-text-secondary);
  font-size: 13px;
  font-weight: 500;
}

.nav-subtitle {
  font-size: 16px;
}

.title-color {
  color: var(--color-text-light);
}

.content-padding {
  padding: var(--space-xs);
}

.content-padding-alt {
  padding: var(--space-xs);
}

/* ========== Layout System ========== */

.gjs-row {
  display: flex;
  flex-wrap: wrap;
  width: 100%;
  gap: 0;
}

.gjs-cell {
  flex: 1;
  min-width: 0;
}

.content-row {
  background-color: var(--color-bg);
  padding: var(--space-xl) var(--space-md);
}

.content-width-limiter {
  width: 100%;
  max-width: 720px;
  margin-left: auto;
  margin-right: auto;
}

.content-bg-yellow,
.content-bg-white {
  background-color: var(--color-bg);
  border: var(--line-width) solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: var(--space-xl);
}

/* ========== Typography ========== */

.desc-font {
  font-size: 15px;
}

.title-text {
  text-align: center;
  color: var(--color-text);
  font-size: 20px;
  font-weight: 600;
}

.white-text {
  color: var(--color-bg);
}

.center-text,
.center-align {
  text-align: center;
}

.left-align,
.left-text,
.text-center,
.content-main-text {
  text-align: left;
}

.text-center-nav {
  text-align: center;
}

.section-padding {
  padding: var(--space-sm);
}

.no-margin {
  margin: 0;
}

.padding-10 {
  padding: var(--space-md);
}

/* ========== Section Styles ========== */

.notice-header {
  margin-bottom: var(--space-lg);
}

.page-header-section {
  margin-bottom: var(--space-lg);
}

.section-header {
  margin-bottom: var(--space-lg);
}

.section-header-alt {
  margin-bottom: var(--space-lg);
}

.section-header-repeat {
  margin-bottom: var(--space-lg);
}

.section-title {
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  color: var(--color-text);
  text-align: left;
  padding: var(--space-sm) 0;
  border-bottom: var(--line-width) solid var(--color-border);
  margin-bottom: var(--space-md);
}

.yellowgreen-title {
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  color: var(--color-text);
  text-align: left;
  padding: var(--space-sm) 0;
  border-bottom: var(--line-width) solid var(--color-border);
  margin-bottom: var(--space-md);
}

.section-title-text {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
}

.section-title-text-main {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--color-accent);
  text-align: left;
  padding: var(--space-sm) var(--space-md);
  border-left: 3px solid var(--color-accent);
  background-color: transparent !important;
  margin-bottom: var(--space-md);
}

.section-title-text-sub {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text);
  text-align: left;
  padding: var(--space-sm) var(--space-md);
  border-left: 2px solid var(--color-border-dark);
  background-color: transparent !important;
  border-radius: 0;
  margin-bottom: var(--space-md);
}

.section-title-text-sub-sub {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text-secondary);
  text-align: left;
  background-color: transparent;
  margin-bottom: var(--space-sm);
  padding-bottom: var(--space-sm);
  border-bottom: var(--line-width) dashed var(--color-border);
}

.subsection-header {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text);
  text-align: left;
  margin: var(--space-lg) 0 var(--space-md) 0;
  padding-left: var(--space-md);
  border-left: 2px solid var(--color-accent);
}

.sub-subsection-header {
  font-size: 13px;
  font-weight: 500;
  color: var(--color-text-secondary);
  text-align: left;
  margin: var(--space-md) 0 var(--space-sm) 0;
  padding-left: calc(var(--space-md) + var(--space-sm));
}

.subsection-content {
  background-color: var(--color-bg-subtle);
  padding: var(--space-md);
  border-radius: var(--radius-sm);
  display: block;
  border: var(--line-width) solid var(--color-border);
}

/* ========== Content Boxes ========== */

.content-bg {
  background-color: var(--color-bg-subtle);
}

.content-bg-alt {
  background-color: var(--color-bg-subtle);
}

.content-section {
  background-color: var(--color-bg-subtle);
}

.grey-bg {
  background-color: var(--color-bg-muted);
}

.darkgrey-bg {
  background-color: #e8e8e8;
}

.blue-bg {
  background-color: #e8f4fc;
}

.lightblue-bg {
  background-color: #f0f7ff;
}

.gold-bg {
  background-color: #fffef0;
}

.yellow-bg {
  background-color: #fefefe;
}

.yellowgreen-bg {
  background-color: transparent;
}

.content-bg-lightgrey {
  background-color: transparent;
  padding: var(--space-md) 0;
}

.content-bg-white {
  background-color: var(--color-bg);
  border: var(--line-width) solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: var(--space-lg);
  box-shadow: none;
}

.content-bg-white-text {
  background-color: var(--color-bg);
  border: var(--line-width) solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: var(--space-lg);
  box-shadow: none;
}

.content-bg-white-sub {
  background-color: var(--color-bg);
  border: var(--line-width) solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: var(--space-lg);
  box-shadow: none;
}

.content-bg-white-section {
  background-color: var(--color-bg);
  border: var(--line-width) solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: var(--space-lg);
  box-shadow: none;
}

.content-section-no-margin {
  margin: 0;
}

.bg-image-reset,
.bg-reset,
.page-section-reset {
  background-image: unset;
  background-repeat: unset;
  background-position: unset;
  background-attachment: unset;
  background-size: unset;
}

.content-box {
  background-color: var(--color-bg);
  border: var(--line-width) solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: var(--space-md);
  margin: var(--space-sm) 0;
  box-shadow: none;
}

/* ========== Notice / Alert Boxes ========== */

.notice-box {
  padding: 0 0 0 var(--space-md);
  background-color: var(--color-bg-subtle);
  border: var(--line-width) solid var(--color-border);
  border-left: 3px solid var(--color-accent);
}

.notice-box-red {
  background-color: #fef9f9;
  padding: var(--space-md);
  margin: var(--space-sm) 0;
  position: relative;
  overflow: hidden;
  border: var(--line-width) solid #f5c6c6;
  border-left: 3px solid #e74c3c;
  border-radius: var(--radius-sm);
  color: #c0392b;
  font-size: 14px;
  line-height: 1.6;
}

.notice-box-red::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background-color: #e74c3c;
}

.notice-box-alt {
  padding: 0 0 0 var(--space-md);
  background-color: var(--color-bg-subtle);
  border: var(--line-width) solid var(--color-border);
}

.function-box-blue {
  background-color: #f8faff;
  padding: var(--space-md);
  margin: var(--space-sm) 0;
  position: relative;
  overflow: hidden;
  border: var(--line-width) solid #d0dce8;
  border-left: 3px solid var(--color-accent);
  border-radius: var(--radius-sm);
}

.function-box-blue::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background-color: var(--color-accent);
}

.quote-box-grey {
  background-color: var(--color-bg-subtle);
  padding: var(--space-md);
  margin: var(--space-sm) 0;
  position: relative;
  overflow: hidden;
  border: var(--line-width) solid var(--color-border);
  border-left: 3px solid var(--color-text-light);
  border-radius: var(--radius-sm);
  font-style: italic;
  color: var(--color-text-secondary);
}

.quote-box-grey::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background-color: var(--color-text-light);
}

/* ========== Quick Navigation (Sidebar) ========== */

.quick-nav {
  position: fixed;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 36px;
  background-color: var(--color-bg);
  border: var(--line-width) solid var(--color-border);
  border-left: none;
  z-index: 1001;
  font-size: 12px;
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  overflow: hidden;
  padding: var(--space-md) var(--space-xs);
  user-select: none;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  box-shadow: 2px 0 8px rgba(0, 0, 0, 0.06);
}

.quick-nav:hover {
  width: 200px;
  padding: var(--space-md);
  box-shadow: 4px 0 16px rgba(0, 0, 0, 0.1);
}

.quick-nav-title {
  color: var(--color-accent);
  font-size: 11px;
  font-weight: 700;
  text-align: center;
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: var(--space-sm);
  writing-mode: vertical-rl;
  text-orientation: mixed;
  white-space: nowrap;
}

.quick-nav:hover .quick-nav-title {
  writing-mode: horizontal-tb;
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-sm);
  border-bottom: var(--line-width) solid var(--color-border);
}

.quick-nav-hint {
  color: var(--color-text-light);
  font-size: 10px;
  text-align: center;
  writing-mode: vertical-rl;
  text-orientation: mixed;
  white-space: nowrap;
  margin-top: var(--space-sm);
}

.quick-nav:hover .quick-nav-hint {
  display: none;
}

.quick-nav-item {
  color: var(--color-text-secondary);
  text-decoration: none;
  display: block;
  padding: var(--space-sm) var(--space-md);
  margin: 2px 0;
  border-radius: var(--radius-sm);
  transition: all 0.15s ease;
  cursor: pointer;
  white-space: nowrap;
  font-size: 13px;
  font-weight: 500;
  border: var(--line-width) solid transparent;
}

.quick-nav-item:hover {
  color: var(--color-accent);
  background-color: var(--color-bg-subtle);
  border-color: var(--color-border);
  transform: translateX(2px);
}

.quick-nav-divider {
  height: var(--line-width);
  background-color: var(--color-border);
  margin: var(--space-sm) 0;
}

.quick-nav-section {
  color: var(--color-text-light);
  font-weight: 600;
  font-size: 10px;
  letter-spacing: 1px;
  text-transform: uppercase;
  margin: var(--space-md) 0 var(--space-sm) 0;
  padding: var(--space-xs) var(--space-md);
  text-align: left;
}

.quick-nav-content {
  display: none;
}

.quick-nav:hover .quick-nav-content {
  display: block;
}

.quick-nav:not(:hover) .quick-nav-content {
  display: none;
}

.quick-nav-page-title {
  color: var(--color-accent);
  padding: var(--space-sm) var(--space-md);
  font-size: 12px;
  font-weight: 600;
  margin: var(--space-sm) 0;
  text-align: left;
  cursor: pointer;
  border-bottom: var(--line-width) dashed var(--color-border);
}

/* TOC Tree Styles */

.quick-nav-toc-parent {
  position: relative;
  margin: var(--space-xs) 0;
}

.quick-nav-toc-item {
  color: var(--color-text-secondary);
  display: block;
  padding: var(--space-xs) var(--space-md) var(--space-xs) calc(var(--space-md) + var(--space-sm));
  margin: 1px 0;
  border-radius: var(--radius-sm);
  transition: all 0.15s ease;
  cursor: pointer;
  font-size: 12px;
  font-weight: 400;
}

.quick-nav-toc-item:hover {
  color: var(--color-accent);
  background-color: var(--color-bg-subtle);
  transform: translateX(2px);
}

.quick-nav-toc-item-with-children {
  color: var(--color-text);
  text-decoration: none;
  display: block;
  padding: var(--space-sm) var(--space-xxl) var(--space-sm) var(--space-md);
  margin: 2px 0;
  border-radius: var(--radius-sm);
  transition: all 0.15s ease;
  cursor: pointer;
  white-space: nowrap;
  width: 100%;
  box-sizing: border-box;
  font-size: 13px;
  font-weight: 500;
}

.quick-nav-toc-item-with-children:hover {
  color: var(--color-accent);
  background-color: var(--color-bg-subtle);
  transform: translateX(2px);
}

.quick-nav-toc-toggle {
  position: absolute;
  right: var(--space-md);
  top: var(--space-sm);
  width: 16px;
  height: 16px;
  background-color: var(--color-bg-muted);
  border: var(--line-width) solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text-secondary);
  text-align: center;
  line-height: 14px;
  font-size: 12px;
  font-weight: bold;
  cursor: pointer;
  transition: all 0.2s ease;
  z-index: 100;
}

.quick-nav-toc-toggle:hover {
  background-color: var(--color-border);
  color: var(--color-text);
}

.quick-nav-toc-toggle.collapsed::before {
  content: '+';
}

.quick-nav-toc-toggle.expanded::before {
  content: '−';
}

.quick-nav-toc-children {
  display: none;
  padding-left: var(--space-md);
  margin-top: var(--space-xs);
  margin-bottom: var(--space-xs);
}

.quick-nav-toc-children.show {
  display: block;
}

.quick-nav-toc-child-item {
  color: var(--color-text-secondary);
  display: block;
  padding: var(--space-xs) var(--space-md);
  margin: 1px 0;
  border-radius: var(--radius-sm);
  transition: all 0.15s ease;
  cursor: pointer;
  font-size: 11px;
}

.quick-nav-toc-child-item:hover {
  color: var(--color-accent);
  background-color: var(--color-bg-subtle);
  transform: translateX(2px);
}

.quick-nav-toc-children .quick-nav-toc-child-item {
  position: relative;
}

.quick-nav-toc-children .quick-nav-toc-children {
  padding-left: var(--space-md);
}

.quick-nav-toc-children .quick-nav-toc-children .quick-nav-toc-children {
  padding-left: var(--space-md);
}

.quick-nav-toc-children .quick-nav-toc-children .quick-nav-toc-children .quick-nav-toc-children {
  padding-left: var(--space-md);
}

.quick-nav-toc-children .quick-nav-toc-child-item {
  font-size: 11px;
}

.quick-nav-toc-children .quick-nav-toc-children .quick-nav-toc-child-item {
  font-size: 10px;
}

.quick-nav-toc-children .quick-nav-toc-children .quick-nav-toc-children .quick-nav-toc-child-item {
  font-size: 10px;
}

/* ========== Float Buttons ========== */

.float-button {
  position: fixed;
  right: var(--space-lg);
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  background-color: var(--color-bg);
  color: var(--color-text-secondary);
  border: var(--line-width) solid var(--color-border);
  cursor: pointer;
  font-size: 11px;
  font-weight: 600;
  z-index: 1000;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  line-height: 1.3;
  letter-spacing: 0.5px;
}

.float-button:hover {
  background-color: var(--color-accent);
  color: var(--color-bg);
  border-color: var(--color-accent);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(44, 62, 80, 0.15);
}

.back-to-top {
  bottom: var(--space-xl);
}

.nav-hub {
  bottom: var(--space-lg);
}

/* ========== Footer ========== */

.footer-row {
  background-color: var(--color-bg-subtle);
  border-top: var(--line-width) solid var(--color-border);
  padding: var(--space-xl) var(--space-md);
}

.footer-row-alt {}

.footer-gradient {
  background-color: var(--color-bg-subtle);
  background-image: none;
}

.copyright-color,
.copyright-text {
  color: var(--color-text-light);
  font-size: 12px;
  line-height: 1.8;
}

.copyright-center {
  text-align: center;
}

/* ========== Mobile Navigation ========== */

.mobile-nav {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background-color: var(--color-bg);
  border-top: var(--line-width) solid var(--color-border);
  padding: var(--space-sm) var(--space-md);
  z-index: 1000;
  flex-direction: column;
  gap: var(--space-sm);
}

.mobile-nav-title {
  color: var(--color-accent);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  text-align: center;
  margin-bottom: var(--space-xs);
}

.mobile-nav-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-sm);
}

.mobile-nav-link {
  color: var(--color-text-secondary);
  text-decoration: none;
  padding: var(--space-xs) var(--space-md);
  border: var(--line-width) solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 12px;
  font-weight: 500;
  transition: all 0.15s ease;
}

.mobile-nav-link:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
  background-color: var(--color-bg-subtle);
}

/* ========== News Carousel ========== */

.news-card {
  background-color: var(--color-bg);
  border: var(--line-width) solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: var(--space-lg);
  margin: var(--space-sm) 0;
  transition: all 0.2s ease;
  width: 100%;
}

.news-card:hover {
  border-color: var(--color-accent);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

.news-card-content {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-lg);
  flex-wrap: wrap;
  padding: var(--space-sm) 0;
}

.news-card-image {
  flex: 0 0 auto;
  max-width: 180px;
  width: 100%;
}

.news-card-image img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-sm);
  border: var(--line-width) solid var(--color-border);
  transition: transform 0.2s ease;
}

.news-card-image img:hover {
  transform: scale(1.02);
}

.news-card-info {
  flex: 1;
  min-width: 180px;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  align-items: center;
  text-align: center;
}

.news-card-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
  margin: 0;
}

.news-card-date {
  font-size: 12px;
  color: var(--color-text-light);
  margin: 0;
}

.news-card-hint {
  font-size: 11px;
  color: var(--color-accent);
  font-style: normal;
  margin: 0;
  padding: var(--space-xs) var(--space-sm);
  background-color: var(--color-bg-subtle);
  border: var(--line-width) solid var(--color-border);
  border-radius: var(--radius-sm);
}

.news-card-text-only {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--space-xl) var(--space-lg);
  min-height: 140px;
  cursor: pointer;
  text-decoration: none;
  transition: all 0.2s ease;
  color: var(--color-text);
  border: var(--line-width) solid transparent;
}

.news-card-text-only:hover {
  background-color: var(--color-bg-subtle);
  border-color: var(--color-border);
}

.news-card-text-only .news-card-title {
  font-size: 18px;
  margin-bottom: var(--space-sm);
}

.news-card-text-only .news-card-date {
  margin-bottom: var(--space-md);
}

.news-carousel-container {
  position: relative;
  width: 100%;
  max-width: 720px;
  margin: 0 auto;
  padding: var(--space-lg) 60px;
}

.news-carousel-wrapper {
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
}

.news-carousel-track {
  display: flex;
  transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  width: 100%;
}

.news-carousel-card {
  flex: 0 0 100%;
  padding: 0 var(--space-sm);
  transition: opacity 0.25s ease, transform 0.25s ease;
  display: flex;
  align-items: center;
}

.news-carousel-card.prev-preview,
.news-carousel-card.next-preview {
  opacity: 0.4;
  transform: scale(0.97);
}

.news-carousel-nav-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 36px;
  height: 36px;
  background-color: var(--color-bg);
  color: var(--color-text);
  border: var(--line-width) solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 18px;
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  justify-content: center;
}

.news-carousel-nav-btn:hover {
  background-color: var(--color-accent);
  color: var(--color-bg);
  border-color: var(--color-accent);
}

.news-carousel-nav-btn.disabled {
  opacity: 0.3;
  pointer-events: none;
}

.news-carousel-nav-btn.prev {
  left: 10px;
}

.news-carousel-nav-btn.next {
  right: 10px;
}

/* ========== ID Selectors (Legacy Support) ========== */

#content-box-main,
#content-box-white,
#section-1,
#content-section-white,
#content-box-white-sub,
#content-box-white-sub-sub,
#section-2,
#content-box-white-section2,
#content-box-white-section3,
#content-box-white-section3-sub {
  background-color: var(--color-bg);
}

hr {
  border: none;
  border-top: var(--line-width) solid var(--color-border);
  margin: var(--space-md) 0;
}

p {
  margin: var(--space-sm) 0;
  line-height: 1.7;
}

strong {
  font-weight: 600;
  color: var(--color-text);
}

/* ========== Responsive Design ========== */

@media (max-width: 768px) {
  .gjs-row {
    flex-direction: column;
    padding: var(--space-sm);
    gap: var(--space-sm);
  }

  .gjs-cell {
    width: 100% !important;
    flex: 0 0 100%;
  }

  .content-width-limiter {
    width: 100%;
    max-width: 100%;
  }

  .logo-header-row {
    flex-direction: row;
    gap: var(--space-sm);
  }

  .main-container {
    padding: var(--space-lg) var(--space-sm);
  }

  .logo-container {
    width: 100%;
    text-align: center;
  }

  .logo-img-custom {
    max-width: 40px !important;
    width: auto !important;
    height: auto !important;
    margin: 0 auto;
    display: block;
  }

  .logo-size-custom {
    max-width: 80px !important;
    width: auto !important;
    height: auto !important;
    margin: 0 auto;
    display: block;
  }

  .logo-size {
    max-width: 80px !important;
    margin: 0 auto;
    display: block;
    width: auto !important;
    height: auto !important;
  }

  .logo-img {
    max-width: 40px !important;
    margin: 0 auto;
    display: block;
    width: auto !important;
    height: auto !important;
  }

  .logo-align {
    text-align: center;
  }

  .page-title-main {
    font-size: 13px;
    padding: var(--space-sm) 0;
    margin-top: var(--space-sm);
  }

  .slogan-container-text {
    font-size: 12px;
  }

  .slogan-line {
    width: 40px;
    max-width: 40px;
  }

  .header-row {
    padding: var(--space-xs) var(--space-sm);
  }

  .nav-padding {
    padding: var(--space-xs);
  }

  .nav-title {
    font-size: 10px;
  }

  .nav-location {
    font-size: 11px;
  }

  .content-row {
    padding: var(--space-md) var(--space-sm);
  }

  .content-bg-white,
  .content-bg-white-text,
  .content-bg-white-sub,
  .content-bg-yellow {
    padding: var(--space-md) var(--space-sm);
  }

  .section-title-text {
    font-size: 14px;
    padding: var(--space-sm) var(--space-md);
  }

  .notice-box-red,
  .function-box-blue,
  .quote-box-grey {
    padding: var(--space-sm) var(--space-md);
    margin: var(--space-sm) var(--space-xs);
    font-size: 13px;
  }

  .float-button {
    right: var(--space-sm);
    width: 40px;
    height: 40px;
    font-size: 10px;
  }

  .back-to-top {
    bottom: 70px;
  }

  .nav-hub {
    bottom: var(--space-md);
  }

  .quick-nav {
    left: 0;
    width: 32px;
    padding: var(--space-sm) var(--space-xs);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    pointer-events: auto;
    cursor: pointer;
  }

  .quick-nav:hover {
    width: 32px;
    padding: var(--space-sm) var(--space-xs);
  }

  .quick-nav:hover .quick-nav-content {
    display: none;
  }

  .quick-nav:hover .quick-nav-title {
    writing-mode: vertical-rl;
    margin-bottom: var(--space-sm);
    padding-bottom: 0;
    border-bottom: none;
  }

  .quick-nav:hover .quick-nav-hint {
    display: block;
  }

  .quick-nav.expanded {
    width: 180px;
    padding: var(--space-md);
  }

  .quick-nav.expanded .quick-nav-content {
    display: block !important;
  }

  .quick-nav.expanded .quick-nav-title {
    writing-mode: horizontal-tb;
    margin-bottom: var(--space-md);
    padding-bottom: var(--space-sm);
    border-bottom: var(--line-width) solid var(--color-border);
  }

  .quick-nav.expanded .quick-nav-hint {
    display: none;
  }

  .quick-nav-page-title {
    font-size: 11px;
    padding: var(--space-xs) var(--space-sm);
    pointer-events: none;
    cursor: default;
  }

  .quick-nav-item,
  .quick-nav-toc-item,
  .quick-nav-toc-item-with-children,
  .quick-nav-toc-child-item {
    pointer-events: auto;
  }

  .footer-row-alt {
    padding: var(--space-lg) var(--space-sm);
  }

  .copyright-color {
    font-size: 11px;
  }

  .center-align,
  .left-align {
    word-wrap: break-word;
    overflow-wrap: break-word;
  }

  .content-padding {
    padding: var(--space-sm);
  }

  .content-padding-alt {
    padding: var(--space-sm);
  }

  .notice-header {
    margin: 0 0 var(--space-md) 0;
  }

  .slogan-container {
    padding: 0 var(--space-sm);
    flex-direction: column;
    gap: var(--space-sm);
  }

  .slogan-text {
    font-size: 11px;
    padding: 0 var(--space-sm);
  }

  .slogan-line {
    width: 40px;
    max-width: 40px;
    margin: 0 auto;
  }

  .section-title,
  .section-title-text {
    font-size: 13px;
  }

  .section-padding {
    padding: var(--space-sm);
  }

  .notice-box-red,
  .function-box-blue,
  .quote-box-grey {
    margin: var(--space-sm) var(--space-xs);
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-sm);
  }

  /* Mobile Carousel */
  .news-carousel-container {
    padding: 0 !important;
    margin: 0 !important;
    max-width: 100% !important;
    width: 100% !important;
    overflow: visible !important;
    position: relative !important;
    left: 0 !important;
    right: 0 !important;
  }

  .news-carousel-wrapper {
    width: 100% !important;
    overflow: hidden !important;
    position: relative !important;
  }

  .news-carousel-track {
    display: flex !important;
    transition: transform 0.3s ease !important;
    width: 100% !important;
  }

  .news-carousel-card {
    flex: 0 0 100% !important;
    width: 100% !important;
    padding: var(--space-xs) !important;
    box-sizing: border-box !important;
  }

  .news-card {
    padding: var(--space-md) !important;
    margin: 0 !important;
    box-sizing: border-box !important;
    width: 100% !important;
  }

  .news-card-content {
    display: flex !important;
    flex-direction: column !important;
    align-items: center !important;
    gap: var(--space-sm) !important;
    padding: var(--space-xs) !important;
  }

  .news-card-image {
    max-width: 140px !important;
    width: 100% !important;
    flex: 0 0 auto !important;
  }

  .news-card-image img {
    width: 100% !important;
    height: auto !important;
    max-width: 140px !important;
  }

  .news-card-info {
    flex: 1 !important;
    min-width: auto !important;
    width: 100% !important;
    text-align: center !important;
  }

  .news-card-title {
    font-size: 14px !important;
    margin: 0 0 var(--space-xs) 0 !important;
  }

  .news-card-date {
    font-size: 11px !important;
    margin: 0 0 var(--space-xs) 0 !important;
  }

  .news-card-hint {
    font-size: 10px !important;
    padding: var(--space-xs) var(--space-sm) !important;
    margin: 0 !important;
  }

  .news-card-text-only {
    padding: var(--space-lg) var(--space-md) !important;
    min-height: 110px !important;
  }

  .news-card-text-only .news-card-title {
    font-size: 15px !important;
    margin-bottom: var(--space-sm) !important;
  }

  .news-card-text-only .news-card-date {
    font-size: 11px !important;
    margin-bottom: var(--space-sm) !important;
  }

  .news-card-text-only .news-card-hint {
    font-size: 10px !important;
  }

  .news-carousel-nav-btn {
    position: absolute !important;
    top: 50% !important;
    transform: translateY(-50%) !important;
    width: 32px !important;
    height: 32px !important;
    font-size: 16px !important;
    border-radius: var(--radius-sm) !important;
    padding: 0 !important;
    line-height: 30px !important;
    z-index: 100 !important;
    background-color: var(--color-bg) !important;
    color: var(--color-text) !important;
    border: var(--line-width) solid var(--color-border) !important;
    cursor: pointer !important;
    display: flex !important;
    align-items: center !important;
    justify-content: center !important;
  }

  .news-carousel-nav-btn.prev {
    left: 4px !important;
  }

  .news-carousel-nav-btn.next {
    right: 4px !important;
  }

  .news-carousel-nav-btn.disabled {
    opacity: 0.2 !important;
    pointer-events: none !important;
  }

  .news-carousel-card.prev-preview,
  .news-carousel-card.next-preview {
    opacity: 0.25 !important;
    transform: scale(0.95) !important;
  }
}

@media (max-width: 375px) {
  .gjs-row {
    padding: var(--space-sm);
  }

  .main-container {
    padding: var(--space-md) var(--space-sm);
  }

  .page-title-main {
    font-size: 12px;
  }

  .nav-title {
    font-size: 9px;
  }

  .nav-location {
    font-size: 10px;
  }

  .notice-box-red,
  .function-box-blue,
  .quote-box-grey {
    padding: var(--space-sm);
    margin: var(--space-xs);
    font-size: 12px;
  }

  .float-button {
    width: 36px;
    height: 36px;
    font-size: 9px;
    right: var(--space-xs);
  }

  .back-to-top {
    bottom: 65px;
  }

  .nav-hub {
    bottom: var(--space-sm);
  }
}

@media (min-width: 769px) and (max-width: 1024px) {
  .gjs-row {
    padding: var(--space-md) var(--space-lg);
  }

  .quick-nav {
    width: 32px;
    padding: var(--space-md) var(--space-xs);
  }

  .quick-nav:hover {
    width: 180px;
    padding: var(--space-md);
  }

  .quick-nav-title {
    font-size: 10px;
  }

  .quick-nav-hint {
    font-size: 9px;
  }

  .quick-nav-item {
    font-size: 12px;
    padding: var(--space-sm) var(--space-md);
  }

  .quick-nav-toc-item {
    font-size: 11px;
    padding: var(--space-xs) var(--space-md) var(--space-xs) calc(var(--space-md) + var(--space-sm));
  }

  .content-width-limiter {
    max-width: 640px;
  }
}

/* ========== Collapsible Blocks (Details/Summary) ========== */

details {
  border: var(--line-width) solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: var(--space-md);
  margin: var(--space-sm) 0;
  background-color: var(--color-bg-subtle);
}

details summary {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 0;
  transition: color 0.15s ease;
}

details summary::-webkit-details-marker {
  display: none;
}

details summary::before {
  content: '▸';
  flex-shrink: 0;
  font-size: 12px;
  color: var(--color-accent);
  transition: transform 0.2s ease;
}

details[open] summary::before {
  content: '▾';
}

details summary:hover {
  color: var(--color-accent);
}

details > .indented,
details > div {
  margin-top: var(--space-md);
  padding-left: var(--space-md);
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text-secondary);
}

details > .indented p,
details > .indented p,
details > div p {
  margin: var(--space-xs) 0;
  line-height: 1.7;
}

/* Nested details */
details details {
  margin: var(--space-sm) 0;
  background-color: transparent;
  border-color: var(--color-border);
}

/* ========== Callout Boxes ========== */

.callout {
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
  padding: var(--space-md);
  border-radius: var(--radius-sm);
  border: var(--line-width) solid var(--color-border);
  background-color: var(--color-bg-subtle);
  margin: var(--space-sm) 0;
  line-height: 1.6;
}

.callout .icon,
.callout img.icon {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  font-size: 18px;
  margin-right: 0;
}

.callout p {
  margin: 0;
  font-size: 14px;
  color: var(--color-text-secondary);
}

.callout h1,
.callout h2,
.callout h3 {
  margin: 0 0 var(--space-xs) 0;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text);
}

/* Callout with gray bg (Notion style) */
.block-color-gray_background.callout {
  background-color: var(--color-bg-muted);
}

/* ========== Link to Page (Notion style) ========== */

.link-to-page {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  border: var(--line-width) solid var(--color-border);
  border-radius: var(--radius-sm);
  text-decoration: none !important;
  color: var(--color-accent) !important;
  font-weight: 500;
  font-size: 14px;
  transition: all 0.15s ease;
  margin: var(--space-sm) 0;
}

.link-to-page:hover {
  background-color: var(--color-bg-subtle);
  border-color: var(--color-accent);
  text-decoration: none !important;
}

.link-to-page .icon {
  font-size: 16px;
}

/* ========== Dark Mode ========== */

@media (prefers-color-scheme: dark) {
  :root {
    --color-text: #e8e6e3;
    --color-text-secondary: #a0a0a0;
    --color-text-light: #707070;
    --color-border: #333333;
    --color-border-dark: #444444;
    --color-bg: #1a1a1a;
    --color-bg-subtle: #222222;
    --color-bg-muted: #2a2a2a;
    --color-accent: #5d9ccc;
    --color-accent-light: #7ab8e0;
    --color-accent-hover: #8ecfff;
  }

  body {
    color: var(--color-text);
    background-color: var(--color-bg);
  }

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

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

  .main-container {
    background-color: var(--color-bg);
    border-bottom-color: var(--color-border);
  }

  .slogan-line,
  .slogan-line-left,
  .slogan-line-right {
    background-color: var(--color-border-dark);
  }

  .slogan-text {
    color: var(--color-text-secondary);
  }

  .page-title-main {
    color: var(--color-text);
    border-top-color: var(--color-border);
  }

  .header-row {
    background-color: var(--color-bg-subtle);
    border-bottom-color: var(--color-border);
  }

  .nav-title {
    color: var(--color-text-light);
  }

  .nav-location {
    color: var(--color-text-secondary);
  }

  .title-color {
    color: var(--color-text-light);
  }

  .content-row {
    background-color: var(--color-bg);
  }

  .content-bg-yellow,
  .content-bg-white,
  .content-bg-white-text,
  .content-bg-white-sub,
  .content-bg-white-section {
    background-color: var(--color-bg-subtle);
    border-color: var(--color-border);
  }

  .content-bg-lightgrey {
    background-color: transparent;
  }

  .section-title-text-main {
    color: var(--color-accent);
    border-left-color: var(--color-accent);
  }

  .section-title-text-sub {
    color: var(--color-text);
    border-left-color: var(--color-border-dark);
  }

  .section-title-text-sub-sub {
    color: var(--color-text-secondary);
    border-bottom-color: var(--color-border);
  }

  .subsection-header {
    color: var(--color-text);
    border-left-color: var(--color-accent);
  }

  .sub-subsection-header {
    color: var(--color-text-secondary);
  }

  .subsection-content {
    background-color: var(--color-bg-muted);
    border-color: var(--color-border);
  }

  .content-bg {
    background-color: var(--color-bg-subtle);
  }

  .content-bg-alt {
    background-color: var(--color-bg-subtle);
  }

  .content-section {
    background-color: var(--color-bg-subtle);
  }

  .grey-bg {
    background-color: var(--color-bg-muted);
  }

  .darkgrey-bg {
    background-color: #333333;
  }

  .blue-bg {
    background-color: #1a2833;
  }

  .lightblue-bg {
    background-color: #1e2d38;
  }

  .gold-bg {
    background-color: #2a2518;
  }

  .yellow-bg {
    background-color: var(--color-bg);
  }

  .yellowgreen-bg {
    background-color: transparent;
  }

  .content-box {
    background-color: var(--color-bg-subtle);
    border-color: var(--color-border);
  }

  .notice-box {
    background-color: var(--color-bg-muted);
    border-color: var(--color-border);
    border-left-color: var(--color-accent);
  }

  .notice-box-red {
    background-color: #2a1a1a;
    border-color: #5c3030;
    border-left-color: #e74c3c;
    color: #e0a0a0;
  }

  .notice-box-alt {
    background-color: var(--color-bg-muted);
    border-color: var(--color-border);
  }

  .function-box-blue {
    background-color: #1a1e24;
    border-color: #2a3544;
    border-left-color: var(--color-accent);
  }

  .quote-box-grey {
    background-color: var(--color-bg-muted);
    border-color: var(--color-border);
    border-left-color: var(--color-text-light);
    color: var(--color-text-secondary);
  }

  .quick-nav {
    background-color: var(--color-bg-subtle);
    border-color: var(--color-border);
    box-shadow: 2px 0 8px rgba(0, 0, 0, 0.3);
  }

  .quick-nav:hover {
    box-shadow: 4px 0 16px rgba(0, 0, 0, 0.5);
  }

  .quick-nav-title {
    color: var(--color-accent);
  }

  .quick-nav-hint {
    color: var(--color-text-light);
  }

  .quick-nav-item {
    color: var(--color-text-secondary);
    border-color: transparent;
  }

  .quick-nav-item:hover {
    color: var(--color-accent);
    background-color: var(--color-bg-muted);
    border-color: var(--color-border);
  }

  .quick-nav-divider {
    background-color: var(--color-border);
  }

  .quick-nav-section {
    color: var(--color-text-light);
  }

  .quick-nav-page-title {
    color: var(--color-accent);
    border-bottom-color: var(--color-border);
  }

  .quick-nav-toc-item {
    color: var(--color-text-secondary);
  }

  .quick-nav-toc-item:hover {
    color: var(--color-accent);
    background-color: var(--color-bg-muted);
  }

  .quick-nav-toc-item-with-children {
    color: var(--color-text);
  }

  .quick-nav-toc-item-with-children:hover {
    color: var(--color-accent);
    background-color: var(--color-bg-muted);
  }

  .quick-nav-toc-toggle {
    background-color: var(--color-bg-muted);
    border-color: var(--color-border);
    color: var(--color-text-secondary);
  }

  .quick-nav-toc-toggle:hover {
    background-color: var(--color-border);
    color: var(--color-text);
  }

  .quick-nav-toc-child-item {
    color: var(--color-text-secondary);
  }

  .quick-nav-toc-child-item:hover {
    color: var(--color-accent);
    background-color: var(--color-bg-muted);
  }

  .float-button {
    background-color: var(--color-bg-subtle);
    color: var(--color-text-secondary);
    border-color: var(--color-border);
  }

  .float-button:hover {
    background-color: var(--color-accent);
    color: #1a1a1a;
    border-color: var(--color-accent);
    box-shadow: 0 4px 12px rgba(93, 156, 204, 0.2);
  }

  .footer-row {
    background-color: var(--color-bg-subtle);
    border-top-color: var(--color-border);
  }

  .footer-gradient {
    background-color: var(--color-bg-subtle);
  }

  .copyright-color,
  .copyright-text {
    color: var(--color-text-light);
  }

  .mobile-nav {
    background-color: var(--color-bg-subtle);
    border-top-color: var(--color-border);
  }

  .mobile-nav-title {
    color: var(--color-accent);
  }

  .mobile-nav-link {
    color: var(--color-text-secondary);
    border-color: var(--color-border);
  }

  .mobile-nav-link:hover {
    color: var(--color-accent);
    border-color: var(--color-accent);
    background-color: var(--color-bg-muted);
  }

  .news-card {
    background-color: var(--color-bg-subtle);
    border-color: var(--color-border);
  }

  .news-card:hover {
    border-color: var(--color-accent);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
  }

  .news-card-image img {
    border-color: var(--color-border);
  }

  .news-card-title {
    color: var(--color-text);
  }

  .news-card-date {
    color: var(--color-text-light);
  }

  .news-card-hint {
    color: var(--color-accent);
    background-color: var(--color-bg-muted);
    border-color: var(--color-border);
  }

  .news-card-text-only {
    color: var(--color-text);
    border-color: transparent;
  }

  .news-card-text-only:hover {
    background-color: var(--color-bg-muted);
    border-color: var(--color-border);
  }

  .news-carousel-nav-btn {
    background-color: var(--color-bg-subtle);
    color: var(--color-text);
    border-color: var(--color-border);
  }

  .news-carousel-nav-btn:hover {
    background-color: var(--color-accent);
    color: #1a1a1a;
    border-color: var(--color-accent);
  }

  .news-carousel-nav-btn.disabled {
    opacity: 0.3;
  }

  hr {
    border-top-color: var(--color-border);
  }

  strong {
    color: var(--color-text);
  }

  .white-text {
    color: var(--color-bg);
  }

  .section-title {
    border-bottom-color: var(--color-border);
  }

  .yellowgreen-title {
    border-bottom-color: var(--color-border);
  }

  .section-title-text {
    color: var(--color-text);
  }

  .logo-border {
    color: var(--color-text);
  }

  details {
    border-color: var(--color-border);
    background-color: var(--color-bg-muted);
  }

  details summary {
    color: var(--color-text);
  }

  details summary:hover {
    color: var(--color-accent-hover);
  }

  details summary::before {
    color: var(--color-accent);
  }

  details > .indented,
  details > div {
    color: var(--color-text-secondary);
  }

  details details {
    border-color: var(--color-border);
  }

  .callout {
    border-color: var(--color-border);
    background-color: var(--color-bg-muted);
  }

  .callout p {
    color: var(--color-text-secondary);
  }

  .callout h1,
  .callout h2,
  .callout h3 {
    color: var(--color-text);
  }

  .block-color-gray_background.callout {
    background-color: #2a2a2a;
  }

  .link-to-page {
    border-color: var(--color-border);
    color: var(--color-accent) !important;
  }

  .link-to-page:hover {
    background-color: var(--color-bg-muted);
    border-color: var(--color-accent);
  }
}