:root {
  --bg-primary: #f4f6ff;
  --bg-secondary: #e7e9f6;
  --surface: #ffffff;
  --text-primary: #2c3b78;
  --text-secondary: #4f5e96;
  --accent-start: #879ef3;
  --accent-end: #6882e5;
  --border-glass: rgba(255, 255, 255, 0.5);
  --shadow: 0 12px 40px rgba(44, 59, 120, 0.12);
  --shadow-soft: 0 8px 24px rgba(44, 59, 120, 0.1);
  --radius-lg: 24px;
  --radius-md: 16px;
  --radius-sm: 12px;
  --max-width: 1080px;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  background: radial-gradient(circle at 15% 10%, rgba(135, 158, 243, 0.35), transparent 32%),
    radial-gradient(circle at 80% 20%, rgba(104, 130, 229, 0.28), transparent 35%),
    linear-gradient(180deg, var(--bg-primary), var(--bg-secondary));
  color: var(--text-primary);
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  min-height: 100%;
}

body {
  min-height: 100vh;
  line-height: 1.55;
}

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

a:focus-visible,
button:focus-visible {
  outline: 3px solid rgba(104, 130, 229, 0.45);
  outline-offset: 2px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: -9999px;
}

.skip-link:focus {
  left: 16px;
  top: 16px;
  z-index: 1000;
  background: #fff;
  color: var(--text-primary);
  padding: 8px 12px;
  border-radius: 8px;
}

.page-shell {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 20px 16px 48px;
}

.topbar {
  position: sticky;
  top: 12px;
  z-index: 30;
  margin-bottom: 18px;
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.62);
  border: 1px solid var(--border-glass);
  box-shadow: var(--shadow-soft);
  backdrop-filter: saturate(140%) blur(14px);
  -webkit-backdrop-filter: saturate(140%) blur(14px);
}

.topbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 14px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text-primary);
  font-weight: 700;
  letter-spacing: 0.2px;
}

.brand-logo {
  width: 92px;
  height: auto;
}

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

.nav-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  padding: 8px 12px;
  text-decoration: none;
  color: var(--text-secondary);
  font-weight: 600;
  font-size: 14px;
}

.nav-link[aria-current="page"] {
  background: linear-gradient(180deg, var(--accent-start), var(--accent-end));
  color: #fff;
}

.lang-switch {
  position: relative;
  display: inline-flex;
  flex-direction: column;
  align-items: flex-end;
}

.lang-trigger {
  border: 0;
  border-radius: 999px;
  padding: 8px 12px;
  background: linear-gradient(180deg, rgba(135, 158, 243, 0.24), rgba(104, 130, 229, 0.22));
  color: var(--text-primary);
  font-weight: 700;
  font-size: 12px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  box-shadow: 0 8px 18px rgba(104, 130, 229, 0.2);
}

.lang-trigger[aria-expanded="true"] .lang-trigger-caret {
  transform: rotate(180deg);
}

.lang-trigger-caret {
  transition: transform 0.16s ease;
}

.lang-trigger-name {
  font-size: 12px;
  font-weight: 600;
}

.lang-menu {
  margin-top: 8px;
  min-width: 218px;
  max-height: 320px;
  overflow-y: auto;
  border-radius: 14px;
  padding: 6px;
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid rgba(255, 255, 255, 0.8);
  box-shadow: 0 18px 36px rgba(44, 59, 120, 0.2);
  backdrop-filter: blur(14px) saturate(130%);
  -webkit-backdrop-filter: blur(14px) saturate(130%);
  position: absolute;
  top: 100%;
  right: 0;
  z-index: 40;
}

.lang-menu-item {
  width: 100%;
  border: 0;
  background: transparent;
  color: var(--text-primary);
  padding: 9px 10px;
  border-radius: 10px;
  text-align: left;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
}

.lang-menu-item:hover {
  background: rgba(104, 130, 229, 0.12);
}

.lang-menu-item[aria-current="true"] {
  background: linear-gradient(180deg, rgba(135, 158, 243, 0.2), rgba(104, 130, 229, 0.16));
}

.lang-menu-code {
  font-size: 11px;
  font-weight: 800;
  color: var(--accent-end);
  min-width: 40px;
}

.lang-menu-name {
  font-weight: 600;
}

.lang-trigger-code {
  font-weight: 800;
}

.lang-trigger,
.lang-menu-item,
.lang-trigger-caret,
.lang-menu {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.lang-menu[hidden] {
  display: none !important;
}

.lang-trigger:focus-visible,
.lang-menu-item:focus-visible {
  border: 0;
  outline: 3px solid rgba(104, 130, 229, 0.38);
  outline-offset: 2px;
}

.hero,
.content-card,
.notice-card {
  background: rgba(255, 255, 255, 0.68);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  backdrop-filter: saturate(145%) blur(16px);
  -webkit-backdrop-filter: saturate(145%) blur(16px);
}

.hero {
  padding: 28px 24px;
  margin-bottom: 18px;
  position: relative;
  overflow: hidden;
}

.hero::after {
  content: "";
  position: absolute;
  width: 220px;
  height: 220px;
  right: -50px;
  top: -70px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(135, 158, 243, 0.5), rgba(135, 158, 243, 0));
  pointer-events: none;
}

.hero h1 {
  margin: 0;
  font-size: clamp(28px, 5vw, 44px);
  line-height: 1.1;
}

.hero p {
  margin: 12px 0 0;
  max-width: 760px;
  color: var(--text-secondary);
  font-size: 17px;
}

.badges {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

.badge {
  font-size: 12px;
  padding: 7px 11px;
  border-radius: 999px;
  background: rgba(104, 130, 229, 0.14);
  color: var(--text-primary);
  font-weight: 700;
}

.grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-bottom: 18px;
}

.tile-link {
  display: block;
  text-decoration: none;
  color: inherit;
}

.content-card {
  padding: 20px;
  height: 100%;
}

.content-card h2 {
  margin: 0 0 8px;
  font-size: 21px;
}

.content-card p {
  margin: 0;
  color: var(--text-secondary);
}

.arrow {
  margin-top: 12px;
  color: var(--accent-end);
  font-weight: 700;
}

.notice-card {
  padding: 16px 18px;
  margin-bottom: 18px;
  color: var(--text-secondary);
  font-size: 14px;
}

.doc {
  padding: 24px;
}

.doc h1 {
  margin: 0;
  font-size: clamp(28px, 4vw, 38px);
}

.doc .meta {
  margin-top: 10px;
  color: var(--text-secondary);
  font-size: 14px;
}

.doc article {
  margin-top: 20px;
}

.doc section {
  margin: 0 0 18px;
}

.doc h2 {
  margin: 0 0 8px;
  font-size: 20px;
}

.doc h3 {
  margin: 12px 0 6px;
  font-size: 16px;
}

.doc p,
.doc li {
  color: var(--text-primary);
  font-size: 15px;
}

.doc ul {
  margin: 8px 0 0 20px;
  padding: 0;
}

.doc table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 8px;
  overflow: hidden;
  border-radius: 12px;
}

.doc th,
.doc td {
  text-align: left;
  vertical-align: top;
  padding: 10px;
  border-bottom: 1px solid rgba(44, 59, 120, 0.12);
  font-size: 14px;
}

.doc th {
  background: rgba(104, 130, 229, 0.14);
  color: var(--text-primary);
}

.footer {
  margin-top: 20px;
  padding: 16px;
  text-align: center;
  color: var(--text-secondary);
  font-size: 13px;
}

[data-lang] {
  display: none;
}

[data-lang].is-visible {
  display: block;
}

@media (max-width: 920px) {
  .topbar-inner {
    flex-wrap: wrap;
  }

  .nav {
    order: 3;
    width: 100%;
    justify-content: flex-start;
    overflow-x: auto;
    padding-bottom: 2px;
  }

  .grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 560px) {
  .hero,
  .content-card,
  .doc {
    padding: 18px;
  }

  .brand-logo {
    width: 78px;
  }

  .lang-switch {
    margin-left: auto;
  }

  .lang-trigger-name {
    display: none;
  }

  .lang-menu {
    right: 0;
    min-width: min(86vw, 280px);
  }
}