:root {
  color-scheme: light dark;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;

  --bg: #f4f3ef;
  --panel: #ffffff;
  --sidebar: #ebe9e3;
  --text: #1d1c1a;
  --muted: #7a776f;
  --border: #dedbd3;
  --hover: rgba(0, 0, 0, 0.045);
  --accent: #b4530a;
  --accent-soft: rgba(180, 83, 10, 0.12);
  --danger: #c0392b;
  --code-bg: #f1efe9;
  --shadow: 0 12px 32px rgba(0, 0, 0, 0.1);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #171716;
    --panel: #1e1e1c;
    --sidebar: #131312;
    --text: #e9e7e0;
    --muted: #8e8b83;
    --border: #2c2c29;
    --hover: rgba(255, 255, 255, 0.05);
    --accent: #e39a4f;
    --accent-soft: rgba(227, 154, 79, 0.16);
    --danger: #e5695a;
    --code-bg: #262624;
    --shadow: 0 12px 32px rgba(0, 0, 0, 0.55);
  }
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

html,
body {
  height: 100%;
  margin: 0;
}

body {
  font-family: var(--font-sans);
  font-size: 14px;
  background: var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
}

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

button {
  cursor: pointer;
}

.muted {
  color: var(--muted);
}

/* ---------- 布局 ---------- */

.app {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  height: 100dvh;
}

.sidebar {
  display: flex;
  flex-direction: column;
  min-height: 0;
  background: var(--sidebar);
  border-right: 1px solid var(--border);
}

.workspace {
  display: flex;
  flex-direction: column;
  min-width: 0;
  min-height: 0;
  background: var(--panel);
}

/* ---------- 侧栏 ---------- */

.sidebar-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 12px 8px 16px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 9px;
  font-weight: 650;
  font-size: 15px;
  letter-spacing: -0.01em;
}

.brand.big {
  font-size: 20px;
  gap: 10px;
  margin-bottom: 6px;
}

.search {
  position: relative;
  padding: 0 12px 10px;
}

.search-icon {
  position: absolute;
  left: 22px;
  top: 9px;
  color: var(--muted);
  pointer-events: none;
}

.search input {
  width: 100%;
  padding: 7px 10px 7px 30px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--panel);
  font-size: 13px;
  outline: none;
}

.search input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.note-list {
  flex: 1;
  margin: 0;
  padding: 0 8px 8px;
  list-style: none;
  overflow-y: auto;
}

.note-item {
  padding: 9px 10px;
  border-radius: 8px;
  cursor: pointer;
  user-select: none;
}

.note-item:hover {
  background: var(--hover);
}

.note-item.active {
  background: var(--accent-soft);
}

.note-item .title {
  font-weight: 560;
  font-size: 14px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.note-item .title.untitled {
  color: var(--muted);
  font-weight: 400;
}

.note-item .meta {
  display: flex;
  gap: 8px;
  margin-top: 3px;
  font-size: 12px;
  color: var(--muted);
}

.note-item .time {
  flex: none;
}

.note-item .excerpt {
  flex: 1;
  min-width: 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.list-empty {
  padding: 32px 12px;
  text-align: center;
  color: var(--muted);
  font-size: 13px;
}

.sidebar-foot {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 16px;
  border-top: 1px solid var(--border);
  font-size: 12px;
  color: var(--muted);
}

.link-btn {
  margin-left: auto;
  padding: 0;
  border: 0;
  background: none;
  color: var(--muted);
  font-size: 12px;
}

.link-btn:hover {
  color: var(--text);
  text-decoration: underline;
}

/* ---------- 工具栏 ---------- */

.toolbar {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  border-bottom: 1px solid var(--border);
  min-height: 46px;
}

.spacer {
  flex: 1;
}

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  padding: 0;
  border: 0;
  border-radius: 7px;
  background: transparent;
  color: var(--muted);
}

.icon-btn:hover {
  background: var(--hover);
  color: var(--text);
}

.menu-btn {
  display: none;
}

.seg {
  display: inline-flex;
  padding: 2px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
}

.seg button {
  padding: 3px 10px;
  border: 0;
  border-radius: 6px;
  background: transparent;
  color: var(--muted);
  font-size: 13px;
}

.seg button.active {
  background: var(--panel);
  color: var(--text);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

.seg.disabled {
  opacity: 0.4;
  pointer-events: none;
}

.status {
  font-size: 12px;
  color: var(--muted);
  transition: color 0.2s;
}

.status[data-kind="dirty"] {
  color: var(--accent);
}

.status[data-kind="error"] {
  color: var(--danger);
}

.word-count {
  font-size: 12px;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 5px 10px;
  border: 1px solid var(--border);
  border-radius: 7px;
  background: var(--panel);
  color: var(--text);
  font-size: 13px;
  line-height: 1.3;
}

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

.btn:disabled {
  opacity: 0.4;
  pointer-events: none;
}

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

.btn.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  font-weight: 560;
}

.btn.primary:hover {
  filter: brightness(1.08);
}

.btn.block {
  width: 100%;
  justify-content: center;
  padding: 9px;
}

/* ---------- 编辑区 ---------- */

.panes {
  flex: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  min-height: 0;
}

.workspace[data-view="edit"] .panes,
.workspace[data-view="preview"] .panes {
  grid-template-columns: 1fr;
}

.workspace[data-view="edit"] .preview,
.workspace[data-view="preview"] .editor {
  display: none;
}

.editor {
  width: 100%;
  height: 100%;
  padding: 28px 32px 40vh;
  border: 0;
  resize: none;
  outline: none;
  background: var(--panel);
  color: var(--text);
  font-size: 15px;
  line-height: 1.75;
  tab-size: 2;
}

.workspace[data-view="split"] .editor {
  border-right: 1px solid var(--border);
}

.editor::placeholder {
  color: var(--muted);
  opacity: 0.7;
}

.preview {
  overflow-y: auto;
  padding: 28px 36px 40vh;
  background: var(--panel);
}

.workspace[data-view="preview"] .preview,
.workspace[data-view="edit"] .editor {
  padding-left: max(32px, calc((100% - 760px) / 2));
  padding-right: max(32px, calc((100% - 760px) / 2));
}

.empty {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  color: var(--muted);
}

.empty p {
  margin: 0;
}

/* ---------- Markdown 预览排版 ---------- */

.prose {
  font-size: 16px;
  line-height: 1.8;
  word-wrap: break-word;
}

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

.prose h1,
.prose h2,
.prose h3,
.prose h4 {
  line-height: 1.3;
  font-weight: 650;
  letter-spacing: -0.01em;
}

.prose h1 {
  font-size: 1.9em;
  margin: 0 0 0.7em;
}

.prose h2 {
  font-size: 1.45em;
  margin: 1.6em 0 0.6em;
  padding-bottom: 0.25em;
  border-bottom: 1px solid var(--border);
}

.prose h3 {
  font-size: 1.2em;
  margin: 1.4em 0 0.5em;
}

.prose h4 {
  font-size: 1.05em;
  margin: 1.2em 0 0.4em;
}

.prose p,
.prose ul,
.prose ol,
.prose blockquote,
.prose pre,
.prose table {
  margin: 0 0 1em;
}

.prose ul,
.prose ol {
  padding-left: 1.6em;
}

.prose li + li {
  margin-top: 0.25em;
}

.prose li > p {
  margin-bottom: 0.4em;
}

.prose li.task-item,
.prose li:has(> input[type="checkbox"]) {
  list-style: none;
  margin-left: -1.4em;
}

.prose input[type="checkbox"] {
  margin: 0 0.5em 0 0;
  vertical-align: -1px;
  accent-color: var(--accent);
}

.prose a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.prose code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  padding: 0.15em 0.4em;
  border-radius: 5px;
  background: var(--code-bg);
}

.prose pre {
  padding: 14px 16px;
  border-radius: 10px;
  background: var(--code-bg);
  overflow-x: auto;
  line-height: 1.6;
}

.prose pre code {
  padding: 0;
  background: none;
  font-size: 0.85em;
}

.prose blockquote {
  margin-left: 0;
  padding: 0.2em 1em;
  border-left: 3px solid var(--accent);
  color: var(--muted);
}

.prose blockquote > :last-child {
  margin-bottom: 0;
}

.prose img {
  max-width: 100%;
  border-radius: 8px;
}

.prose table {
  display: block;
  max-width: 100%;
  overflow-x: auto;
  border-collapse: collapse;
  font-size: 0.95em;
}

.prose th,
.prose td {
  padding: 6px 12px;
  border: 1px solid var(--border);
  text-align: left;
}

.prose th {
  background: var(--code-bg);
  font-weight: 600;
}

.prose hr {
  margin: 2em 0;
  border: 0;
  border-top: 1px solid var(--border);
}

/* ---------- 登录 ---------- */

.login {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 20px;
  background: var(--bg);
}

.login-card {
  width: min(360px, 100%);
  padding: 28px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--panel);
  box-shadow: var(--shadow);
}

.login-card p {
  margin: 0 0 16px;
  font-size: 13px;
}

.login-card input {
  width: 100%;
  margin-bottom: 12px;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  outline: none;
}

.login-card input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.error {
  min-height: 1.2em;
  margin: 12px 0 0 !important;
  color: var(--danger);
}

.login-card code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  padding: 0.1em 0.35em;
  border-radius: 4px;
  background: var(--code-bg);
}

.login-card .cmd {
  margin: 0 0 14px;
  padding: 10px 12px;
  border-radius: 8px;
  background: var(--code-bg);
  font-family: var(--font-mono);
  font-size: 13px;
  overflow-x: auto;
  user-select: all;
}

/* ---------- 移动端 ---------- */

.backdrop {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.35);
  z-index: 15;
}

@media (max-width: 768px) {
  .app {
    grid-template-columns: minmax(0, 1fr);
  }

  .sidebar {
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    width: min(86vw, 320px);
    z-index: 20;
    transform: translateX(-100%);
    transition: transform 0.22s ease;
    box-shadow: none;
  }

  .app.sidebar-open .sidebar {
    transform: none;
    box-shadow: var(--shadow);
  }

  .app.sidebar-open .backdrop {
    display: block;
  }

  .menu-btn {
    display: inline-flex;
  }

  .seg button[data-view="split"],
  .word-count,
  .btn span {
    display: none;
  }

  .btn {
    padding: 6px 8px;
  }

  .editor,
  .preview {
    padding: 20px 18px 40vh !important;
  }
}