:root {
  --blue-900: #0b2742;
  --blue-700: #0f4c81;
  --blue-100: #eaf4fd;
  --gray-900: #1c2630;
  --gray-700: #5c6976;
  --gray-300: #d7e0e8;
  --gray-100: #f5f7fa;
  --white: #fff;
  --danger: #b42318;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "Segoe UI", "Noto Sans JP", "Noto Sans CJK JP", Arial, sans-serif;
  background: #f3f6f9;
  color: var(--gray-900);
}
button, input, textarea, select {
  font: inherit;
}
.hidden { display: none !important; }
.login-view {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
}
.login-card {
  width: min(440px, 100%);
  padding: 30px;
  background: var(--white);
  border: 1px solid #e1e8ef;
  border-radius: 8px;
  box-shadow: 0 18px 48px rgba(17, 50, 82, .12);
}
.eyebrow {
  margin: 0 0 8px;
  color: var(--blue-700);
  font-size: 12px;
  text-transform: uppercase;
  font-weight: 800;
}
h1 { margin: 0 0 20px; color: var(--blue-900); }
.help, .small { color: var(--gray-700); }
.small { font-size: 13px; }
label {
  display: grid;
  gap: 7px;
  margin: 14px 0;
  color: var(--gray-700);
  font-weight: 800;
}
input, textarea, select {
  width: 100%;
  border: 1px solid var(--gray-300);
  border-radius: 8px;
  background: var(--white);
  padding: 11px 12px;
  color: var(--gray-900);
}
textarea { min-height: 92px; resize: vertical; }
button {
  border: 0;
  border-radius: 8px;
  padding: 11px 15px;
  background: var(--blue-700);
  color: var(--white);
  font-weight: 800;
  cursor: pointer;
}
.ghost {
  background: var(--white);
  color: var(--blue-900);
  border: 1px solid var(--gray-300);
}
.link { display: inline-flex; align-items: center; text-decoration: none; }
.danger { background: var(--danger); }
.error { color: var(--danger); font-weight: 800; min-height: 22px; }
.admin-shell {
  display: grid;
  grid-template-columns: 280px 1fr;
  min-height: 100vh;
}
.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  overflow: auto;
  padding: 22px;
  background: var(--blue-900);
  color: var(--white);
}
.side-brand {
  display: grid;
  gap: 4px;
  margin-bottom: 18px;
}
.side-brand strong { font-size: 18px; }
.side-brand span { color: #b9cde0; font-size: 13px; }
.sidebar select {
  margin-bottom: 18px;
  background: #143c62;
  color: var(--white);
  border-color: #2f5b82;
}
#adminMenu {
  display: grid;
  gap: 8px;
  margin-bottom: 18px;
}
#adminMenu button {
  width: 100%;
  text-align: left;
  background: transparent;
  border: 1px solid rgba(255,255,255,.14);
  color: #e8f3ff;
}
#adminMenu button.active {
  background: #eaf4fd;
  color: var(--blue-900);
}
.editor {
  padding: clamp(18px, 3vw, 38px);
}
.editor-head {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  align-items: start;
  margin-bottom: 20px;
  padding-bottom: 18px;
  border-bottom: 1px solid #dce5ee;
}
.actions, .save-panel {
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
}
.inline-actions {
  display: flex;
  gap: 12px;
  align-items: center;
  flex-wrap: wrap;
  margin-top: 12px;
}
.inline-message {
  min-height: auto;
  margin: 0;
}
#editorForm {
  display: grid;
  gap: 16px;
}
.form-section, .array-item, .image-preview {
  background: var(--white);
  border: 1px solid #e1e8ef;
  border-radius: 8px;
  padding: 18px;
  box-shadow: 0 10px 28px rgba(17, 50, 82, .05);
}
.form-section h2 {
  margin: 0 0 14px;
  font-size: 19px;
  color: var(--blue-900);
}
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}
.array-head {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
  margin-bottom: 10px;
}
.array-head strong { color: var(--blue-900); }
.muted { color: var(--gray-700); font-size: 13px; }
.save-panel {
  position: sticky;
  bottom: 0;
  margin-top: 24px;
  padding: 14px;
  background: rgba(243,246,249,.96);
  border-top: 1px solid #dce5ee;
  backdrop-filter: blur(12px);
}
#statusText { color: var(--blue-700); font-weight: 800; }
.image-preview img, .image-preview svg {
  max-width: min(520px, 100%);
  height: auto;
  display: block;
  margin-top: 12px;
  border: 1px solid #e1e8ef;
  border-radius: 8px;
}
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}
.gallery-item {
  margin: 0;
  overflow: hidden;
  border: 1px solid #e1e8ef;
  border-radius: 8px;
  background: #fff;
}
.gallery-item img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  display: block;
  background: #fff7ef;
}
.gallery-item figcaption {
  display: grid;
  gap: 4px;
  padding: 10px;
}
.gallery-item span {
  color: var(--gray-700);
  font-size: 12px;
  word-break: break-all;
}
.code-box { min-height: 210px; font-family: Consolas, monospace; }

@media (max-width: 820px) {
  .admin-shell { grid-template-columns: 1fr; }
  .sidebar { position: static; height: auto; }
  .editor-head { flex-direction: column; }
  .grid-2 { grid-template-columns: 1fr; }
  .gallery-grid { grid-template-columns: 1fr; }
}