:root {
  --bg: #f6f8fb;
  --panel: #ffffff;
  --line: #e5e7eb;
  --text: #1f2937;
  --muted: #6b7280;
  --accent: #4f8ff7;
  --accent-soft: #eaf2ff;
  --danger: #cf4d4d;
  --shadow: 0 2px 10px rgba(15, 23, 42, 0.06);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  min-height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: "Hiragino Kaku Gothic ProN", "Yu Gothic", "Meiryo", "Noto Sans JP", sans-serif;
  line-height: 1.65;
}

button,
input,
select,
textarea {
  font: inherit;
  color: inherit;
}

.app-shell {
  display: grid;
  grid-template-columns: 252px 360px minmax(420px, 1fr);
  gap: 14px;
  padding: 16px;
  min-height: 100vh;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 16px;
  box-shadow: var(--shadow);
  min-height: 0;
}

.left-column,
.center-column,
.right-column {
  padding: 16px;
}

.left-column {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.brand-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

.brand-logo {
  display: block;
  width: min(190px, 100%);
  height: auto;
  max-height: 56px;
  object-fit: contain;
}

.beta-badge {
  border: 1px solid #d7e6ff;
  color: #2c62bf;
  background: var(--accent-soft);
  border-radius: 999px;
  padding: 2px 10px;
  font-size: 0.75rem;
}

.brand-copy {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.left-actions {
  display: grid;
  gap: 8px;
}

.btn {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 10px 12px;
  cursor: pointer;
  transition: 0.15s ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: var(--accent);
  border-color: #3f7ee0;
  color: #fff;
}

.btn-secondary {
  background: #fff;
}

.btn-danger {
  color: var(--danger);
  background: #fff;
  border-color: #f2d6d6;
}

.btn-plain {
  background: transparent;
  border: none;
  color: var(--muted);
  padding: 8px 0;
}

#help-open-btn {
  text-align: left;
}

.left-section h2 {
  margin: 0 0 8px;
  font-size: 0.9rem;
  color: var(--muted);
}

.filter-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 6px;
}

.filter-btn,
.tag-btn {
  width: 100%;
  text-align: left;
  border: 1px solid transparent;
  background: transparent;
  padding: 8px 10px;
  border-radius: 10px;
  cursor: pointer;
}

.filter-btn:hover,
.tag-btn:hover {
  background: #f8fafc;
}

.filter-btn.is-active,
.tag-btn.is-active {
  background: var(--accent-soft);
  border-color: #c7ddff;
  color: #1f4f9f;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.tag-btn {
  width: auto;
  border: 1px solid #e7eef9;
  background: #f8fbff;
  font-size: 0.86rem;
}

.storage-hint {
  margin-top: auto;
  border-top: 1px solid var(--line);
  padding-top: 12px;
  color: var(--muted);
  font-size: 0.88rem;
}

.storage-hint p {
  margin: 2px 0;
}

.center-column {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.list-toolbar {
  display: grid;
  gap: 8px;
}

input,
select,
textarea {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 10px 12px;
  background: #fff;
}

input:focus,
select:focus,
textarea:focus {
  outline: 2px solid #b8d0f8;
  border-color: #b8d0f8;
}

.note-list {
  display: grid;
  gap: 10px;
  overflow: auto;
  padding-right: 2px;
}

.note-card {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
  padding: 12px;
  cursor: pointer;
  box-shadow: 0 1px 5px rgba(15, 23, 42, 0.04);
}

.note-card.is-active {
  border-color: #bdd7ff;
  background: #f9fbff;
}

.note-card h3 {
  margin: 0 0 6px;
  font-size: 1rem;
}

.card-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 8px;
  align-items: center;
  color: var(--muted);
  font-size: 0.82rem;
}

.type-badge {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  padding: 2px 9px;
  background: #f2f6ff;
  border: 1px solid #dae6ff;
  color: #335ea7;
  font-size: 0.76rem;
}

.tag-chip {
  background: #f7f7f8;
  border: 1px solid #ececec;
  border-radius: 999px;
  padding: 1px 8px;
  font-size: 0.75rem;
  color: #4b5563;
}

.card-snippet {
  margin: 8px 0 0;
  color: #4b5563;
  font-size: 0.9rem;
}

.empty-state {
  border: 1px dashed #d5dbe5;
  border-radius: 12px;
  padding: 22px 14px;
  background: #fafcff;
  color: #5b6472;
}

.empty-title {
  margin: 0 0 6px;
  font-weight: 600;
  color: #1f2937;
}

.right-column {
  display: flex;
  flex-direction: column;
  gap: 12px;
  overflow: hidden;
}

.tab-row {
  display: flex;
  gap: 8px;
}

.tab-btn {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 7px 16px;
  background: #fff;
  cursor: pointer;
}

.tab-btn.is-active {
  background: var(--accent-soft);
  border-color: #c9ddff;
  color: #1f4f9f;
}

.editor-view,
.preview-view {
  overflow: auto;
  display: grid;
  gap: 10px;
  padding-right: 2px;
}

.editor-view[hidden],
.preview-view[hidden] {
  display: none !important;
}

.field-label {
  color: var(--muted);
  font-size: 0.88rem;
}

.field-grid {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 10px;
}

.meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
  color: var(--muted);
  font-size: 0.84rem;
}

.meta-row p {
  margin: 0;
}

textarea {
  min-height: 220px;
  resize: vertical;
}

.editor-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
}

#save-status-text {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.action-row {
  display: flex;
  gap: 8px;
}

.preview-header h2 {
  margin: 0 0 4px;
}

.preview-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  color: var(--muted);
  font-size: 0.9rem;
}

.markdown-body {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 14px;
}

.markdown-body h1,
.markdown-body h2,
.markdown-body h3 {
  margin: 1.2em 0 0.5em;
}

.markdown-body h1:first-child,
.markdown-body h2:first-child,
.markdown-body h3:first-child {
  margin-top: 0;
}

.markdown-body p,
.markdown-body li {
  margin: 0.5em 0;
}

.markdown-body hr {
  border: none;
  border-top: 1px solid var(--line);
  margin: 1em 0;
}

.markdown-body a {
  color: #2f6ac8;
}

.inline-note-link {
  border: none;
  background: #eef4ff;
  color: #2759a9;
  border-radius: 8px;
  padding: 1px 6px;
  cursor: pointer;
}

.inline-note-link.is-disabled {
  cursor: default;
  color: #8791a1;
  background: #f2f4f8;
}

.related-section {
  border-top: 1px solid var(--line);
  padding-top: 10px;
}

.related-section h3 {
  margin: 0 0 8px;
  font-size: 1rem;
}

.related-list {
  display: grid;
  gap: 8px;
}

.related-item {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 10px;
  background: #fff;
  cursor: pointer;
}

.related-item p {
  margin: 4px 0 0;
  color: #4b5563;
  font-size: 0.86rem;
}

dialog {
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 0;
  box-shadow: 0 20px 45px rgba(17, 24, 39, 0.18);
}

dialog::backdrop {
  background: rgba(20, 24, 35, 0.25);
}

.dialog-content {
  min-width: 320px;
  padding: 16px;
  display: grid;
  gap: 10px;
}

.dialog-content h3 {
  margin: 0;
}

.dialog-content p {
  margin: 0;
  color: var(--muted);
}

.dialog-actions {
  display: grid;
  gap: 8px;
}

.help-dialog-content {
  max-width: 760px;
}

.help-body {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 12px;
  background: #fff;
  max-height: 70vh;
  overflow: auto;
}

.help-body h4 {
  margin: 14px 0 8px;
  font-size: 1rem;
}

.help-body p {
  margin: 8px 0;
  color: #4b5563;
}

.help-body ul,
.help-body ol {
  margin: 8px 0 10px 18px;
  color: #4b5563;
}

@media (max-width: 1200px) {
  .app-shell {
    grid-template-columns: 220px 320px 1fr;
  }
}

@media (max-width: 900px) {
  .app-shell {
    grid-template-columns: 1fr;
  }

  .left-column,
  .center-column,
  .right-column {
    padding: 14px;
  }

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