/* 云便签 v3 —— UI 对齐 httcup/md，深浅色跟随系统 */

:root {
  --bg: #f6f7f9;
  --surface: #ffffff;
  --surface-2: #f1f3f5;
  --text: #1f2430;
  --text-dim: #7a8190;
  --border: #e4e7ec;
  --accent: #3b6ef5;
  --accent-text: #ffffff;
  --danger: #d94a4a;
  --radius: 12px;
  --font: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #17191f;
    --surface: #1f222b;
    --surface-2: #262a35;
    --text: #e8eaef;
    --text-dim: #9aa1af;
    --border: #333846;
    --accent: #5b86f7;
    --accent-text: #ffffff;
  }
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.6;
}
a { color: var(--accent); text-decoration: none; }
[hidden] { display: none !important; }

button {
  font-family: var(--font);
  cursor: pointer;
}
.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-size: 0.8rem;
  transition: border-color .12s, color .12s, background .12s, filter .12s;
}
.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, var(--danger) 45%, var(--border)); color: var(--danger); }
.btn-icon { min-height: 34px; min-width: 34px; padding: 0.3rem 0.45rem; color: var(--text-dim); }
.btn-icon:hover { background: var(--surface-2); }

input[type="text"], input[type="password"], input[type="search"] {
  padding: 0.4rem 0.6rem;
  border: 1px solid var(--border); border-radius: 8px;
  background: var(--surface); color: var(--text);
  font: inherit; font-size: 0.86rem; outline: none;
}
input:focus { border-color: var(--accent); }

.err { color: var(--danger); font-size: 0.82rem; margin-top: 0.5rem; min-height: 1.2em; }
.hint { color: var(--text-dim); font-size: 0.78rem; margin-top: 1rem; }
.hint code { background: var(--surface-2); border-radius: 4px; padding: 1px 6px; }
.back-row { margin: 14px 0 0; text-align: center; }

/* ---------- 首页 / 解锁 ---------- */
.home { max-width: 720px; margin: 10vh auto 0; padding: 0 20px; }
.home .card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 32px 30px;
  box-shadow: 0 6px 24px rgb(16 24 40 / 5%);
}
.home h1 { margin: 0 0 6px; font-size: 24px; }
.home .sub { color: var(--text-dim); margin: 0 0 22px; }
.home .row { display: flex; gap: 10px; }
.home .row input { flex: 1; min-width: 0; }

/* 首页使用说明（仿 webnote 双栏） */
.how-card { margin-top: 16px; padding: 24px 26px !important; }
.how-cols { display: grid; grid-template-columns: 1.2fr 1fr; gap: 26px; }
.how-left h3 { margin: 0 0 12px; font-size: 0.95rem; }
.how-left ol { margin: 0; padding-left: 1.3em; color: var(--text); }
.how-left li { font-size: 0.82rem; line-height: 1.8; }
.how-left code, .how-left b { font-weight: 600; }
.how-left code { background: var(--surface-2); border-radius: 4px; padding: 1px 6px; color: var(--accent); }
.how-right {
  background: color-mix(in srgb, var(--accent) 7%, var(--surface));
  border: 1px solid color-mix(in srgb, var(--accent) 22%, var(--border));
  border-radius: 10px; padding: 16px 18px; align-self: start;
}
.how-right h4 { margin: 0 0 10px; font-size: 0.85rem; text-align: center; }
.url-demo {
  background: var(--surface); border: 1px solid var(--border); border-radius: 8px;
  padding: 10px 12px; text-align: center; font-size: 0.85rem;
  color: var(--text-dim); word-break: break-all;
}
.url-demo b { color: var(--accent); font-weight: 700; }
.how-right p { margin: 10px 0 0; font-size: 0.76rem; color: var(--text-dim); line-height: 1.7; }
@media (max-width: 640px) {
  .how-cols { grid-template-columns: 1fr; }
  .home { margin-top: 6vh; }
}

/* ---------- 笔记本骨架 ---------- */
.tool-main { max-width: 1180px; margin: 0 auto; padding: 14px; height: 100vh; }

.nb-app {
  display: grid;
  grid-template-columns: 236px minmax(0, 1fr);
  height: 100%;
  min-height: 0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: 0 6px 24px rgb(16 24 40 / 5%);
  overflow: hidden;
  transition: grid-template-columns .2s ease;
}
.nb-app.side-hidden { grid-template-columns: 0 minmax(0, 1fr); }
.nb-app.side-hidden .nb-side { visibility: hidden; border-inline-end-color: transparent; }

/* 左侧 */
.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-size: 0.84rem; font-weight: 600;
  transition: filter .12s, box-shadow .12s;
}
.nb-new:hover { filter: brightness(1.06); }
.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); }
.nb-search input { width: 100%; min-width: 0; border: 0; background: none; padding: 0; font-size: 0.82rem; }
.nb-search input:focus { outline: none; border: 0; }

.nb-notes { flex: 1; min-height: 0; margin: 0; padding: 0 0.45rem 0.4rem; list-style: none; overflow-y: auto; }
.nb-notes li { margin: 0 0 0.15rem; position: relative; }
.nb-note {
  display: block; width: 100%; padding: 0.5rem 1.6rem 0.5rem 0.6rem;
  border: 1px solid transparent; border-radius: 8px;
  background: none; color: inherit; font: inherit; text-align: start;
  transition: background .12s, border-color .12s;
}
.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);
}
.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; white-space: nowrap; text-overflow: ellipsis; }
.note-del {
  position: absolute; top: 0.4rem; right: 0.3rem;
  min-width: 20px; min-height: 20px; padding: 0;
  border: 0; border-radius: 5px; background: none;
  color: var(--text-dim); font-size: 12px; line-height: 1;
}
.note-del:hover { color: var(--danger); background: var(--surface); }
.nb-empty { margin: 0.4rem 0.8rem 0.8rem; color: var(--text-dim); font-size: 0.8rem; }
.nb-side-foot {
  display: flex; flex-wrap: wrap; 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-size: 0.76rem;
}
.nb-ghost:hover { border-color: var(--border); background: var(--surface); color: var(--accent); }

/* 编辑区 */
.nb-editor { display: grid; grid-template-rows: auto minmax(0, 1fr) auto; min-width: 0; min-height: 0; }
.nb-bar {
  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 10rem; 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-state.saved { color: #199d55; }
.nb-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 0.35rem; }

.nb-bar-toggles { display: flex; align-items: center; gap: 0.3rem; flex: none; }
.nb-bar-toggles .btn-icon[aria-pressed="false"] { border-color: transparent; background: none; 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: #fff; }
.btn-prev:hover { border-color: var(--nb-green); background: var(--nb-green); color: #fff; filter: brightness(1.07); }
.btn-prev[aria-pressed="false"] { background: none; color: var(--nb-green); opacity: .85; text-decoration: line-through; }

.nb-views { 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-size: 0.8rem;
}
.nb-view.is-on { border-color: var(--accent); color: var(--accent); font-weight: 600; }

/* 编辑 + 预览 */
.nb-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  min-height: 0;
  transition: grid-template-columns .2s ease;
}
.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-split.read-view { grid-template-columns: minmax(0, 1fr); }
.nb-split.read-view .nb-write { display: none; }
.nb-split.read-view .nb-read { 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;
  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; 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: var(--mono); font-size: 0.9rem; line-height: 1.8;
  resize: none; outline: none; tab-size: 2;
}
#src[readonly] { color: var(--text-dim); }

.nb-read { overflow-y: auto; 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 { margin: 1.35rem 0 0.55rem; line-height: 1.35; }
.nb-prev h1 { font-size: 1.36rem; }
.nb-prev h2 { font-size: 1.16rem; }
.nb-prev h3 { font-size: 1.02rem; }
.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 ul.todo { list-style: none; padding-inline-start: 0.4rem; }
.nb-prev li { margin: 0.18rem 0; }
.nb-prev .task-done { color: var(--text-dim); text-decoration: line-through; }
.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 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: var(--mono); font-size: 0.86em;
}
.nb-prev pre {
  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 pre code { padding: 0; border: 0; background: none; font-size: 1em; white-space: pre; }
.nb-prev table { width: 100%; border-collapse: collapse; margin: 0 0 0.9rem; 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 th { background: var(--surface-2); font-weight: 600; }
.nb-prev img { max-width: 100%; border-radius: 8px; }
.nb-prev a { text-decoration: underline; text-underline-offset: 2px; }
.nb-prev del { color: var(--text-dim); }

/* 状态条 */
.nb-status {
  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;
}
#stat.warn { color: #b45309; font-weight: 600; }
#stat.full { color: var(--danger); font-weight: 700; }

/* 顶栏过期时间徽标（醒目） */
.nb-expiry {
  flex: none; margin-left: 0.4rem; padding: 0.12rem 0.5rem;
  border-radius: 999px; font-size: 0.72rem; font-weight: 700;
  color: #b45309; background: rgb(245 158 11 / 14%);
  border: 1px solid rgb(245 158 11 / 40%); white-space: nowrap;
}
@media (prefers-color-scheme: dark) {
  .nb-expiry { color: #fbbf24; background: rgb(245 158 11 / 18%); border-color: rgb(245 158 11 / 45%); }
}

/* 置顶按钮 */
#pinBtn { min-height: 30px; }
#pinBtn[aria-pressed="true"] { border-color: var(--accent); color: var(--accent); background: color-mix(in srgb, var(--accent) 10%, transparent); }

/* 回收站 */
.nb-ghost { position: relative; }
.trash-badge {
  position: absolute; top: -6px; right: -6px; min-width: 16px; height: 16px;
  padding: 0 4px; border-radius: 999px; background: var(--danger); color: #fff;
  font-size: 0.62rem; font-weight: 700; line-height: 16px; text-align: center;
}
.trash-list { list-style: none; margin: 0; padding: 0; max-height: 46vh; overflow-y: auto; }
.trash-list li {
  display: flex; align-items: center; gap: 8px;
  padding: 0.45rem 0.2rem; border-bottom: 1px solid var(--border); font-size: 0.84rem;
}
.trash-list .t-name { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.trash-list .t-time { color: var(--text-dim); font-size: 0.72rem; flex: none; }

/* 弹窗 */
.modal {
  position: fixed; inset: 0; z-index: 70;
  background: rgb(16 24 40 / 40%);
  display: flex; align-items: center; justify-content: center;
  padding: 20px;
}
.modal-card {
  width: 360px; max-width: 100%; max-height: 88vh; overflow-y: auto;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 18px 20px;
  box-shadow: 0 12px 40px rgb(16 24 40 / 18%);
}
.modal-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 6px; }
.modal-head h2 { margin: 0; font-size: 1.05rem; }
.modal-label { margin: 14px 0 6px; color: var(--text-dim); font-size: 0.78rem; font-weight: 600; }
.seg { display: inline-flex; border: 1px solid var(--border); border-radius: 8px; overflow: hidden; }
.seg button { border-radius: 0; padding: 5px 16px; font-size: 0.78rem; background: var(--surface); color: var(--text-dim); border: 0; }
.seg button.on { background: var(--accent); color: var(--accent-text); }
.share-link { display: flex; gap: 6px; }
.share-link input { flex: 1; min-width: 0; font-size: 0.78rem; color: var(--text-dim); }
.qr { display: flex; justify-content: center; padding: 12px 0 4px; }
.qr canvas { border: 1px solid var(--border); border-radius: 8px; }
.meta-rows .row { display: flex; justify-content: space-between; padding: 3px 0; font-size: 0.82rem; }
.meta-rows .k { color: var(--text-dim); }
.meta-rows .v { text-align: right; }
.badge { display: inline-block; padding: 1px 9px; border-radius: 999px; font-size: 0.72rem; background: color-mix(in srgb, var(--accent) 12%, transparent); color: var(--accent); }
.badge.warn { background: #fff3e6; color: #c47616; }
.modal-foot { display: flex; justify-content: flex-end; margin-top: 16px; }

/* 轻提示 */
.nb-toast {
  position: fixed; bottom: 1.5rem; left: 50%; z-index: 80;
  margin: 0; padding: 0.5rem 0.95rem;
  border-radius: 999px;
  background: var(--text); color: var(--surface);
  font-size: 0.82rem;
  transform: translateX(-50%);
}

/* 拖拽遮罩 */
.drop-mask {
  position: fixed; inset: 0; z-index: 90;
  background: color-mix(in srgb, var(--accent) 12%, transparent);
  border: 3px dashed var(--accent);
  display: flex; align-items: center; justify-content: center;
  font-size: 18px; color: var(--accent); font-weight: 600;
  pointer-events: none;
}

/* 响应式 */
@media (max-width: 860px) {
  .tool-main { padding: 0; height: 100vh; }
  .nb-app { grid-template-columns: minmax(0, 1fr); border-radius: 0; border: 0; }
  .nb-editor { grid-template-rows: auto auto minmax(0, 1fr) auto; }
  .nb-side {
    position: fixed; left: 0; top: 0; bottom: 0; width: 260px; z-index: 50;
    transform: translateX(-105%); transition: transform .2s ease;
    box-shadow: 4px 0 24px rgb(16 24 40 / 14%);
  }
  .nb-app.side-open .nb-side { transform: none; visibility: visible; }
  .nb-app.side-hidden .nb-side { visibility: visible; }
  .nb-views { display: flex; }
  .nb-split[data-mv="write"] .nb-read { display: none; }
  .nb-split[data-mv="read"] .nb-write { display: none; }
  .nb-split[data-mv="read"] .nb-read { border-inline-end: 0; }
  .nb-actions .btn span.btn-t { display: none; }
}