/* 笔记存为 .md —— 页面样式。变量沿用 site.css，深浅色自动跟随系统。 */

.hub-head,
footer { max-width: 1180px; }

.tool-main { max-width: 1180px; }

.crumbs { padding-top: 0.6rem; }

/* ---------- 整体骨架 ---------- */

.nb-app {
  display: grid;
  grid-template-columns: 236px minmax(0, 1fr);
  grid-template-rows: minmax(0, 1fr);
  height: min(78vh, 780px);
  min-height: 480px;
  margin: 1.5rem 0 0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: var(--shadow);
  overflow: hidden;
  transition: grid-template-columns 0.2s ease;
}

/* 折叠态：左侧列表收起 */
.nb-app.side-hidden { grid-template-columns: 0 minmax(0, 1fr); }
.nb-app.side-hidden .nb-side {
  visibility: hidden;
  border-inline-end-color: transparent;
  transition: visibility 0.2s;
}

/* ---------- 左侧笔记列表 ---------- */

.nb-side {
  display: flex;
  flex-direction: column;
  min-width: 0;
  min-height: 0;
  overflow: hidden;
  background: var(--surface-2);
  border-inline-end: 1px solid var(--border);
}

.nb-side-head {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  padding: 0.7rem 0.7rem 0.55rem;
}

.nb-new {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  min-height: 36px;
  border: 1px solid var(--accent);
  border-radius: 8px;
  background: var(--accent);
  color: var(--accent-text);
  font: inherit;
  font-size: 0.84rem;
  font-weight: 600;
  cursor: pointer;
  transition: filter 0.12s ease, box-shadow 0.12s ease;
}

.nb-new:hover { filter: brightness(1.06); box-shadow: 0 2px 8px color-mix(in srgb, var(--accent) 30%, transparent); }

.nb-search {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.3rem 0.5rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  color: var(--text-dim);
}

.nb-search:focus-within { border-color: var(--accent); color: var(--accent); }

.nb-search input {
  width: 100%;
  min-width: 0;
  border: 0;
  background: none;
  color: var(--text);
  font: inherit;
  font-size: 0.82rem;
}

.nb-search input:focus { outline: none; }
.nb-search input::-webkit-search-cancel-button { -webkit-appearance: none; }

.nb-notes {
  flex: 1;
  min-height: 0;
  margin: 0;
  padding: 0 0.45rem 0.4rem;
  list-style: none;
  overflow-y: auto;
  overscroll-behavior: contain;
}

.nb-notes li { margin: 0 0 0.15rem; }

.nb-note {
  display: block;
  width: 100%;
  padding: 0.5rem 0.6rem;
  border: 1px solid transparent;
  border-radius: 8px;
  background: none;
  color: inherit;
  font: inherit;
  text-align: start;
  cursor: pointer;
  transition: background 0.12s ease, border-color 0.12s ease, box-shadow 0.12s ease;
}

.nb-note:hover { background: color-mix(in srgb, var(--accent) 8%, transparent); }

.nb-note[aria-current="true"] {
  background: var(--surface);
  border-color: var(--border);
  box-shadow: inset 3px 0 0 var(--accent), 0 1px 2px rgb(16 24 40 / 6%);
}

.nb-note-t {
  display: block;
  overflow: hidden;
  font-size: 0.86rem;
  font-weight: 600;
  line-height: 1.35;
  white-space: nowrap;
  text-overflow: ellipsis;
}

.nb-note-m {
  display: block;
  margin-top: 0.15rem;
  overflow: hidden;
  color: var(--text-dim);
  font-size: 0.72rem;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
  text-overflow: ellipsis;
}

.nb-empty {
  margin: 0.4rem 0.8rem 0.8rem;
  color: var(--text-dim);
  font-size: 0.8rem;
}

.nb-side-foot {
  display: flex;
  gap: 0.3rem;
  padding: 0.45rem 0.55rem;
  border-top: 1px solid var(--border);
}

.nb-ghost {
  flex: 1;
  min-height: 30px;
  padding: 0.2rem 0.3rem;
  border: 1px solid transparent;
  border-radius: 7px;
  background: none;
  color: var(--text-dim);
  font: inherit;
  font-size: 0.76rem;
  cursor: pointer;
}

.nb-ghost:hover { border-color: var(--border); background: var(--surface); color: var(--accent); }

/* ---------- 右侧编辑区 ---------- */

.nb-editor {
  display: grid;
  grid-template-rows: auto auto minmax(0, 1fr) auto;
  min-width: 0;
  min-height: 0;
}

.nb-bar {
  grid-row: 1;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem 0.7rem;
  padding: 0.6rem 0.85rem;
  border-bottom: 1px solid var(--border);
}

.nb-title {
  flex: 1 1 12rem;
  min-width: 0;
  padding: 0.32rem 0.45rem;
  border: 1px solid transparent;
  border-radius: 7px;
  background: none;
  color: var(--text);
  font: inherit;
  font-size: 1rem;
  font-weight: 650;
  letter-spacing: -0.01em;
}

.nb-title:hover { border-color: var(--border); }
.nb-title:focus { border-color: var(--accent); outline: none; background: var(--surface); }

.nb-state {
  flex: none;
  color: var(--text-dim);
  font-size: 0.74rem;
  font-variant-numeric: tabular-nums;
}

.nb-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  min-height: 34px;
  padding: 0.3rem 0.7rem;
  border: 1px solid var(--border);
  border-radius: 7px;
  background: var(--surface);
  color: var(--text);
  font: inherit;
  font-size: 0.8rem;
  cursor: pointer;
  transition: border-color 0.12s ease, color 0.12s ease, background 0.12s ease, filter 0.12s ease;
}

.btn:hover { border-color: var(--accent); color: var(--accent); }

.btn-primary {
  border-color: var(--accent);
  background: var(--accent);
  color: var(--accent-text);
  font-weight: 600;
}

.btn-primary:hover { filter: brightness(1.06); color: var(--accent-text); }

.btn-quiet { border-color: transparent; color: var(--text-dim); }
.btn-quiet:hover { border-color: color-mix(in srgb, #d94a4a 45%, var(--border)); color: #d94a4a; }

/* 顶栏折叠按钮 */

.nb-bar-toggles {
  display: flex;
  align-items: center;
  gap: 0.3rem;
  flex: none;
}

.btn-icon {
  min-height: 34px;
  min-width: 34px;
  padding: 0.3rem 0.45rem;
  color: var(--text-dim);
}

.btn-icon:hover { background: var(--surface-2); }

.btn-icon[aria-pressed="false"] {
  border-color: transparent;
  background: none;
  color: var(--text-dim);
  opacity: 0.62;
}

.btn-prev {
  --nb-green: #199d55;
  padding-inline: 0.6rem;
  font-size: 0.78rem;
  font-weight: 650;
  border-color: var(--nb-green);
  background: var(--nb-green);
  color: #ffffff;
}

.btn-prev:hover {
  border-color: var(--nb-green);
  background: var(--nb-green);
  color: #ffffff;
  filter: brightness(1.07);
}

.btn-prev[aria-pressed="false"] {
  background: none;
  border-color: var(--nb-green);
  color: var(--nb-green);
  opacity: 0.85;
  text-decoration: line-through;
}

@media (prefers-color-scheme: dark) {
  .btn-prev { --nb-green: #2fa367; }
}

/* 移动端视图切换（桌面隐藏） */

.nb-views { grid-row: 2; display: none; gap: 0.3rem; padding: 0.4rem 0.85rem 0; }

.nb-view {
  flex: 1;
  min-height: 32px;
  border: 1px solid var(--border);
  border-radius: 7px;
  background: var(--surface);
  color: var(--text-dim);
  font: inherit;
  font-size: 0.8rem;
  cursor: pointer;
}

.nb-view.is-on { border-color: var(--accent); color: var(--accent); font-weight: 600; }

/* ---------- 编辑 + 预览 ---------- */

.nb-split {
  grid-row: 3;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  grid-template-rows: minmax(0, 1fr);
  min-height: 0;
  transition: grid-template-columns 0.2s ease;
}

/* 折叠态：右侧预览收起，编辑区占满 */
.nb-split.prev-hidden { grid-template-columns: minmax(0, 1fr); }
.nb-split.prev-hidden .nb-read { display: none; }
.nb-split.prev-hidden .nb-write { border-inline-end: 0; }

.nb-pane {
  display: flex;
  flex-direction: column;
  min-width: 0;
  min-height: 0;
}

.nb-write { border-inline-end: 1px solid var(--border); }

.nb-tools {
  display: flex;
  flex-wrap: wrap;
  gap: 0.1rem 0.1rem;
  padding: 0.3rem 0.45rem;
  border-bottom: 1px solid var(--border);
}

.nb-tools button {
  flex: none;
  min-height: 28px;
  padding: 0.1rem 0.45rem;
  border: 1px solid transparent;
  border-radius: 6px;
  background: none;
  color: var(--text-dim);
  font: inherit;
  font-size: 0.76rem;
  line-height: 1;
  cursor: pointer;
  white-space: nowrap;
}

.nb-tools button:hover { border-color: var(--border); background: var(--surface-2); color: var(--accent); }

.nb-sep { flex: none; width: 1px; margin: 0.25rem 0.2rem; background: var(--border); }

#src {
  flex: 1 1 0;
  min-height: 0;
  width: 100%;
  padding: 1rem 1.1rem 1.2rem;
  border: 0;
  background: none;
  color: var(--text);
  font-family: ui-monospace, SFMono-Regular, "SF Mono", "Cascadia Mono", Consolas, "Noto Sans Mono CJK SC", monospace;
  font-size: 0.9rem;
  line-height: 1.8;
  resize: none;
  tab-size: 2;
}

#src:focus { outline: none; }

.nb-read {
  overflow-y: auto;
  overscroll-behavior: contain;
  background: color-mix(in srgb, var(--accent) 2.5%, var(--surface));
}

.nb-prev { padding: 0.85rem 1.15rem 1.4rem; }

.nb-prev-empty {
  margin: 0;
  padding: 1.2rem 1.15rem;
  color: var(--text-dim);
  font-size: 0.86rem;
}

/* ---------- 预览排版 ---------- */

.nb-prev > :first-child { margin-top: 0; }

.nb-prev h1,
.nb-prev h2,
.nb-prev h3,
.nb-prev h4,
.nb-prev h5,
.nb-prev h6 {
  margin: 1.35rem 0 0.55rem;
  line-height: 1.35;
  letter-spacing: -0.01em;
}

.nb-prev h1 { font-size: 1.36rem; }
.nb-prev h2 { font-size: 1.16rem; }
.nb-prev h3 { font-size: 1.02rem; }
.nb-prev h4, .nb-prev h5, .nb-prev h6 { font-size: 0.94rem; }

.nb-prev h1,
.nb-prev h2 { padding-bottom: 0.25rem; border-bottom: 1px solid var(--border); }

.nb-prev p { margin: 0 0 0.8rem; font-size: 0.92rem; line-height: 1.75; }

.nb-prev ul,
.nb-prev ol { margin: 0 0 0.85rem; padding-inline-start: 1.35rem; font-size: 0.92rem; line-height: 1.75; }
.nb-prev li { margin: 0.18rem 0; }
.nb-prev li > ul,
.nb-prev li > ol { margin: 0.18rem 0 0.1rem; }
.nb-prev li input[type="checkbox"] { margin-inline-end: 0.35rem; accent-color: var(--accent); }

.nb-prev blockquote {
  margin: 0 0 0.85rem;
  padding: 0.1rem 0 0.1rem 0.85rem;
  border-inline-start: 3px solid var(--border);
  color: var(--text-dim);
}

.nb-prev blockquote p:last-child { margin-bottom: 0; }

.nb-prev hr { margin: 1.3rem 0; border: 0; border-top: 1px solid var(--border); }

.nb-prev code {
  padding: 0.08em 0.32em;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--surface-2);
  font-family: ui-monospace, SFMono-Regular, "Cascadia Mono", Consolas, monospace;
  font-size: 0.86em;
}

.nb-prev .md-pre {
  position: relative;
  margin: 0 0 0.9rem;
  padding: 0.75rem 0.9rem;
  overflow-x: auto;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 0.83rem;
  line-height: 1.6;
}

.nb-prev .md-pre code {
  padding: 0;
  border: 0;
  background: none;
  font-size: 1em;
  white-space: pre;
}

.nb-prev .md-pre[data-lang]::before {
  content: attr(data-lang);
  position: absolute;
  inset-block-start: 0.3rem;
  inset-inline-end: 0.6rem;
  color: var(--text-dim);
  font-size: 0.68rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.nb-prev .md-table-wrap { margin: 0 0 0.9rem; overflow-x: auto; }

.nb-prev table { width: 100%; border-collapse: collapse; font-size: 0.86rem; }

.nb-prev th,
.nb-prev td { padding: 0.4rem 0.6rem; border: 1px solid var(--border); text-align: start; }
.nb-prev thead th { background: var(--surface-2); font-weight: 600; }

.nb-prev a { color: var(--accent); text-decoration: underline; text-underline-offset: 2px; }
.nb-prev a:hover { color: var(--accent-deep); }
.nb-prev .md-img { color: var(--text-dim); }

.nb-prev del { color: var(--text-dim); }

/* ---------- 状态条 ---------- */

.nb-status {
  grid-row: 4;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.25rem 0.8rem;
  padding: 0.4rem 0.9rem;
  border-top: 1px solid var(--border);
  color: var(--text-dim);
  font-size: 0.74rem;
  font-variant-numeric: tabular-nums;
}

.nb-hint { color: var(--text-dim); }

/* ---------- 轻提示 ---------- */

.nb-toast {
  position: fixed;
  inset-block-end: 1.5rem;
  inset-inline-start: 50%;
  z-index: 60;
  margin: 0;
  padding: 0.5rem 0.95rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--text);
  color: var(--bg);
  font-size: 0.82rem;
  transform: translateX(-50%);
  animation: nb-toast-in 0.16s ease-out;
}

@keyframes nb-toast-in {
  from { opacity: 0; transform: translate(-50%, 6px); }
  to { opacity: 1; transform: translate(-50%, 0); }
}

@media (prefers-reduced-motion: reduce) {
  .nb-toast { animation: none; }
}

/* ---------- 窄屏 ---------- */

@media (max-width: 900px) {
  .nb-app {
    grid-template-columns: minmax(0, 1fr);
    height: auto;
    min-height: 0;
  }

  /* 折叠按钮是桌面端功能，窄屏用「编辑 / 预览」切换 */
  .nb-bar-toggles { display: none; }
  .nb-app.side-hidden { grid-template-columns: minmax(0, 1fr); }
  .nb-app.side-hidden .nb-side { visibility: visible; border-inline-end-color: var(--border); }

  .nb-side {
    border-inline-end: 0;
    border-bottom: 1px solid var(--border);
  }

  .nb-side-head {
    flex-direction: row;
    align-items: center;
    gap: 0.4rem;
    padding: 0.5rem 0.6rem;
  }

  .nb-new { flex: none; padding-inline: 0.6rem; }
  .nb-search { flex: 1; min-width: 0; }

  .nb-notes {
    display: flex;
    gap: 0.3rem;
    padding: 0 0.55rem 0.5rem;
    overflow-x: auto;
    overflow-y: hidden;
  }

  .nb-notes li { flex: 0 0 auto; max-width: 12rem; margin: 0; }

  .nb-note { padding: 0.35rem 0.6rem; }
  .nb-note-t { white-space: nowrap; }

  .nb-side-foot { display: none; }

  .nb-views { display: flex; }

  .nb-split { grid-template-columns: minmax(0, 1fr); height: 62vh; min-height: 340px; }
  .nb-write { border-inline-end: 0; }

  .nb-split[data-view="write"] .nb-read { display: none; }
  .nb-split[data-view="read"] .nb-write { display: none; }

  .nb-status .nb-hint { display: none; }
}

@media (max-width: 620px) {
  .nb-bar { padding: 0.5rem 0.6rem; }
  .nb-title { flex-basis: 100%; font-size: 0.95rem; }
  .nb-state { order: 3; }
  .nb-actions { order: 2; margin-inline-start: auto; }
  .nb-split { height: 58vh; }
}