:root {
  --color-bg: #faf7f2;
  --color-surface: #ffffff;
  --color-border: #e4ddd0;
  --color-text: #2b2621;
  --color-text-secondary: #6b6156;
  --color-accent: #8a5a3b;
  --color-accent-contrast: #ffffff;
  --radius: 10px;
  --radius-lg: 20px;
  --radius-sm: 10px;
  --max-width: 960px;
  --font-sans: "Noto Sans", "Noto Sans KR", "Segoe UI", system-ui, -apple-system, sans-serif;

  /* Pastel palette, applied in order: 자주 - 분홍 - 주황 - 노랑 - 연두 - 민트 - 하늘 - 파랑 - 네이비 - 보라 */
  --c1: rgba(214, 163, 199, 0.55);
  --c2: rgba(247, 197, 214, 0.55);
  --c3: rgba(248, 202, 159, 0.55);
  --c4: rgba(247, 224, 150, 0.55);
  --c5: rgba(202, 224, 158, 0.55);
  --c6: rgba(163, 223, 200, 0.55);
  --c7: rgba(160, 205, 230, 0.55);
  --c8: rgba(160, 180, 230, 0.55);
  --c9: rgba(150, 160, 200, 0.55);
  --c10: rgba(196, 170, 220, 0.55);
}

* {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  line-height: 1.6;
  font-size: 17px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--color-accent);
  color: var(--color-accent-contrast);
  padding: 0.75em 1em;
  z-index: 100;
  border-radius: 0 0 var(--radius) 0;
}

.skip-link:focus {
  left: 0;
}

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

:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
}

/* Site name style: uppercase bold gothic (sans-serif) for domain-like site names */
.site-name {
  text-transform: uppercase;
  font-weight: 800;
  letter-spacing: 0.02em;
  font-family: var(--font-sans);
}

/* Bilingual text handling */
.bilingual {
  display: flex;
  flex-direction: column;
  gap: 0.15em;
}

.bilingual-inline {
  flex-direction: row;
  flex-wrap: wrap;
  gap: 0.4em;
  align-items: baseline;
}

.bilingual-block {
  gap: 0.6em;
}

.bilingual .vi-text,
.bilingual .ko-text {
  font-size: 0.94em;
  color: var(--color-text-secondary);
  font-weight: 400;
}

body.lang-vi .bilingual .vi-text {
  order: -1;
  font-size: 1em;
  color: var(--color-text);
  font-weight: 600;
}

body.lang-ko .bilingual .ko-text {
  order: -1;
  font-size: 1em;
  color: var(--color-text);
  font-weight: 600;
}

h1 .bilingual .vi-text,
h1 .bilingual .ko-text,
h2 .bilingual .vi-text,
h2 .bilingual .ko-text {
  font-weight: 700;
  color: var(--color-text);
}

/* ---- Pastel convex "water drop" boxes with asymmetric corners ---- */
/* Top-left & bottom-right rounded, top-right & bottom-left sharp */
.asym {
  border-radius: var(--radius-lg) 0 var(--radius-lg) 0;
}

.asym-sm {
  border-radius: var(--radius-sm) 0 var(--radius-sm) 0;
}

.bubble {
  --box-color: var(--c7);
  position: relative;
  background: linear-gradient(160deg, rgba(255, 255, 255, 0.8), var(--box-color) 68%);
  box-shadow:
    inset 0 2px 3px rgba(255, 255, 255, 0.75),
    inset 0 -8px 14px rgba(0, 0, 0, 0.05),
    0 6px 14px rgba(0, 0, 0, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.6);
}

/* Manual color utility classes (for single, non-grouped elements) */
.box-c1 { --box-color: var(--c1); }
.box-c2 { --box-color: var(--c2); }
.box-c3 { --box-color: var(--c3); }
.box-c4 { --box-color: var(--c4); }
.box-c5 { --box-color: var(--c5); }
.box-c6 { --box-color: var(--c6); }
.box-c7 { --box-color: var(--c7); }
.box-c8 { --box-color: var(--c8); }
.box-c9 { --box-color: var(--c9); }
.box-c10 { --box-color: var(--c10); }

/* Automatic sequential coloring for a group of boxes */
.pastel-group > :nth-child(10n+1) { --box-color: var(--c1); }
.pastel-group > :nth-child(10n+2) { --box-color: var(--c2); }
.pastel-group > :nth-child(10n+3) { --box-color: var(--c3); }
.pastel-group > :nth-child(10n+4) { --box-color: var(--c4); }
.pastel-group > :nth-child(10n+5) { --box-color: var(--c5); }
.pastel-group > :nth-child(10n+6) { --box-color: var(--c6); }
.pastel-group > :nth-child(10n+7) { --box-color: var(--c7); }
.pastel-group > :nth-child(10n+8) { --box-color: var(--c8); }
.pastel-group > :nth-child(10n+9) { --box-color: var(--c9); }
.pastel-group > :nth-child(10n) { --box-color: var(--c10); }

/* Header */
.site-header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1.25rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.brand-title {
  font-size: 1.5rem;
  margin: 0;
  line-height: 1.3;
}

.brand-subtitle {
  margin: 0.35rem 0 0;
  font-size: 0.98rem;
}

.header-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.lang-toggle {
  font-family: inherit;
  font-size: 0.95rem;
  font-weight: 700;
  padding: 0.5em 1.1em;
  border: 1px solid rgba(255, 255, 255, 0.6);
  color: var(--color-text);
  cursor: pointer;
}

.viet-mobile-link {
  font-size: 0.92rem;
  text-decoration: none;
}

.viet-mobile-link:hover {
  text-decoration: underline;
}

/* Main layout */
main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1.5rem 1rem 3rem;
}

.menu-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.9rem;
  margin-bottom: 2.5rem;
}

.menu-card {
  display: block;
  padding: 1.1rem 1.25rem;
  text-decoration: none;
  color: var(--color-text);
  font-size: 1.05rem;
}

.content-section {
  padding: 1.5rem 0;
  border-top: 1px solid var(--color-border);
  scroll-margin-top: 1rem;
}

.content-section h2 {
  margin-top: 0;
  font-size: 1.3rem;
}

.card-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.9rem;
}

.info-card {
  padding: 1.1rem 1.25rem;
}

.placeholder-card {
  color: var(--color-text-secondary);
  font-style: italic;
}

.link-card {
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
}

.link-card-titles {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  margin: 0;
  color: var(--color-text-secondary);
  font-size: 0.95rem;
}

.lang-line:first-child {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--color-text);
}

.external-button {
  display: inline-block;
  align-self: flex-start;
  color: var(--color-text);
  text-decoration: none;
  padding: 0.7em 1.3em;
  font-weight: 700;
}

/* ---- Schedule table ---- */
.schedule-intro {
  margin-top: 0;
}

.schedule-scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.schedule-table {
  border-collapse: collapse;
  width: 100%;
  min-width: 640px;
  font-size: 0.88rem;
  background: var(--color-surface);
}

.schedule-table th,
.schedule-table td {
  border: 1px solid var(--color-border);
  padding: 0.5em 0.6em;
  text-align: center;
  vertical-align: middle;
}

.schedule-table thead th {
  font-weight: 700;
}

.schedule-table thead th.group-treasure {
  background: var(--c7);
}

.schedule-table thead th.group-fs {
  background: var(--c4);
}

.schedule-table thead th.col-date,
.schedule-table thead th.col-chair {
  background: var(--color-surface);
}

.schedule-table .th-vi {
  display: block;
  font-weight: 400;
  font-size: 0.82em;
  color: var(--color-text-secondary);
  margin-top: 0.15em;
}

.schedule-table tbody tr:nth-child(even) {
  background: rgba(160, 205, 230, 0.12);
}

.schedule-table td.col-date {
  font-weight: 600;
  white-space: nowrap;
}

.schedule-note {
  display: block;
  margin-top: 0.2em;
  color: var(--color-accent);
  font-weight: 700;
  font-size: 0.85em;
}

.schedule-multi span {
  display: block;
}

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

/* Footer */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding: 2rem 1rem;
  text-align: center;
}

.footer-links {
  list-style: none;
  margin: 0 0 1rem;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  align-items: center;
}

.footer-links a {
  text-decoration: none;
  font-weight: 700;
}

.footer-links a:hover {
  text-decoration: underline;
}

.footer-note {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  justify-content: center;
}

.footer-admin-link {
  display: inline-block;
  margin-top: 1.25rem;
  font-size: 0.78rem;
  color: var(--color-text-secondary);
  text-decoration: none;
}

.footer-admin-link:hover {
  text-decoration: underline;
}

/* ---- Admin page ---- */
.admin-main {
  max-width: 720px;
  margin: 0 auto;
  padding: 1.5rem 1rem 3rem;
}

.admin-notice {
  padding: 1rem 1.25rem;
  margin-bottom: 1.5rem;
  font-size: 0.92rem;
  color: var(--color-text);
}

.admin-notice strong {
  color: var(--color-accent);
}

.admin-login-form {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  max-width: 360px;
}

.admin-field {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.admin-field label {
  font-weight: 600;
  font-size: 0.92rem;
}

.admin-field input,
.admin-field textarea {
  font-family: inherit;
  font-size: 1rem;
  padding: 0.6em 0.8em;
  border: 1px solid var(--color-border);
  background: rgba(255, 255, 255, 0.85);
}

.admin-error {
  color: #a33d3d;
  font-size: 0.9rem;
  min-height: 1.2em;
}

.admin-button {
  font-family: inherit;
  font-size: 0.95rem;
  font-weight: 700;
  padding: 0.65em 1.2em;
  border: 1px solid rgba(255, 255, 255, 0.6);
  color: var(--color-text);
  cursor: pointer;
}

.admin-button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin: 1.25rem 0;
}

.admin-editor-row {
  padding: 1.1rem 1.25rem;
  margin-bottom: 1rem;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.7rem;
}

.admin-editor-row .admin-field input,
.admin-editor-row .admin-field textarea {
  width: 100%;
}

.admin-editor-row-title {
  font-weight: 700;
  margin: 0 0 0.3rem;
}

.admin-export-output {
  width: 100%;
  min-height: 220px;
  font-family: "Courier New", monospace;
  font-size: 0.82rem;
  padding: 1rem;
  border: 1px solid var(--color-border);
  background: rgba(255, 255, 255, 0.9);
}

.hidden {
  display: none !important;
}

/* Wide screens */
@media (min-width: 640px) {
  .header-inner {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }

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

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

  .footer-links {
    flex-direction: row;
    justify-content: center;
    flex-wrap: wrap;
    gap: 1.5rem;
  }

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