/* ============================================================
   暖纸 + 墨 + 赤陶
   全站不使用任何渐变，强调靠色块与描边。
   ============================================================ */

:root {
  --paper:       #FAF8F4;
  --paper-2:     #F2EEE7;
  --card:        #FFFFFF;
  --ink:         #1A1815;
  --ink-2:       #6B6560;
  --ink-3:       #9A938B;
  --line:        #E5E0D8;
  --line-2:      #C9BEB0;
  --brand:       #B4472A;
  --brand-dark:  #96381F;
  --brand-soft:  #F6E7E2;
  --accent:      #4A5D3A;
  --shadow:      0 1px 2px rgba(26, 24, 21, .05), 0 8px 24px rgba(26, 24, 21, .07);
  --radius:      10px;

  /* 文件类型色：全部落在暖色与土色范围内，没有蓝紫 */
  --k-image:   #4A5D3A;
  --k-sheet:   #6B7A3A;
  --k-doc:     #B4472A;
  --k-slide:   #C4703A;
  --k-pdf:     #A83232;
  --k-text:    #6B6560;
  --k-archive: #8A6B3A;
  --k-other:   #9A938B;
  --k-folder:  #B4A48C;
}

*, *::before, *::after { box-sizing: border-box; }

html, body { height: 100%; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 15px/1.6 system-ui, -apple-system, "Segoe UI", "PingFang SC",
        "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  -webkit-font-smoothing: antialiased;
  overflow-wrap: break-word;
}

body.is-locked { overflow: hidden; }

[hidden] { display: none !important; }

:focus-visible {
  outline: 2px solid var(--brand);
  outline-offset: 2px;
  border-radius: 4px;
}

/* ---------- 通用控件 ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  min-height: 36px;
  padding: 0 14px;
  border: 1px solid var(--line-2);
  border-radius: 8px;
  background: var(--card);
  color: var(--ink);
  font: inherit;
  font-size: 14px;
  text-decoration: none;
  cursor: pointer;
  transition: border-color .12s, background-color .12s, color .12s;
  user-select: none;
}

.btn:hover { border-color: var(--ink-3); background: var(--paper); }

.btn--primary {
  background: var(--brand);
  border-color: var(--brand);
  color: #fff;
  font-weight: 600;
}

.btn--primary:hover { background: var(--brand-dark); border-color: var(--brand-dark); }

.btn--icon {
  min-width: 36px;
  padding: 0 8px;
  font-size: 15px;
  line-height: 1;
}

.btn:disabled { opacity: .4; cursor: default; }

.select {
  min-height: 36px;
  padding: 0 30px 0 10px;
  border: 1px solid var(--line-2);
  border-radius: 8px;
  background: var(--card);
  color: var(--ink);
  font: inherit;
  font-size: 14px;
  cursor: pointer;
  appearance: none;
  background-image: none;
}

/* ---------- 致命错误 ---------- */

.fatal {
  max-width: 640px;
  margin: 14vh auto;
  padding: 28px 30px;
  background: var(--card);
  border: 1px solid var(--line);
  border-left: 4px solid var(--brand);
  border-radius: var(--radius);
  line-height: 1.75;
}

.fatal h2 { margin: 0 0 12px; font-size: 17px; }
.fatal p { margin: 0 0 10px; color: var(--ink-2); }
.fatal code {
  padding: 2px 6px;
  background: var(--paper-2);
  border-radius: 4px;
  font-family: ui-monospace, "Cascadia Code", Consolas, monospace;
  font-size: 13px;
  color: var(--ink);
}

/* ---------- 密码门 ---------- */

.gate {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 24px;
}

.gate__card {
  width: 100%;
  max-width: 360px;
  padding: 36px 32px 28px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  box-shadow: var(--shadow);
  text-align: center;
}

.gate__mark {
  width: 52px;
  height: 52px;
  margin: 0 auto 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--brand);
  color: #fff;
  font-size: 24px;
  font-weight: 700;
  border-radius: 12px;
}

.gate__title { margin: 0 0 6px; font-size: 20px; letter-spacing: .01em; }
.gate__hint { margin: 0 0 22px; color: var(--ink-2); font-size: 13.5px; }

.gate__input {
  width: 100%;
  min-height: 42px;
  padding: 0 14px;
  margin-bottom: 12px;
  border: 1px solid var(--line-2);
  border-radius: 8px;
  background: var(--paper);
  color: var(--ink);
  font: inherit;
  font-size: 15px;
  text-align: center;
}

.gate__input:focus { background: var(--card); border-color: var(--brand); outline: none; }

.gate__submit { width: 100%; min-height: 42px; }

.gate__error {
  min-height: 20px;
  margin: 12px 0 0;
  color: var(--brand);
  font-size: 13.5px;
}

/* ---------- 顶栏 ---------- */

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  background: var(--card);
  border-bottom: 1px solid var(--line);
}

.topbar__inner {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 10px 20px;
}

.crumbs {
  flex: 1;
  min-width: 0;
  display: flex;
  align-items: center;
  gap: 2px;
  flex-wrap: wrap;
  font-size: 14px;
}

.crumb {
  padding: 4px 8px;
  border: 0;
  border-radius: 6px;
  background: none;
  color: var(--ink-2);
  font: inherit;
  font-size: 14px;
  cursor: pointer;
  white-space: nowrap;
}

.crumb:hover { background: var(--paper-2); color: var(--ink); }
.crumb--current { color: var(--ink); font-weight: 600; }
.crumb--current:hover { background: none; cursor: default; }
.crumb__sep { color: var(--ink-3); padding: 0 1px; }

.topbar__tools { display: flex; align-items: center; gap: 8px; flex-shrink: 0; }

.folderbar {
  padding: 0 20px 10px;
  color: var(--ink-2);
  font-size: 12.5px;
}

/* ---------- 列表 ---------- */

.listing { padding: 20px 20px 60px; }

.listing--grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(190px, 1fr));
  gap: 16px;
}

.listing--list { display: flex; flex-direction: column; gap: 2px; }

.empty {
  padding: 80px 20px;
  text-align: center;
  color: var(--ink-2);
}

/* 卡片（网格） */
.card {
  display: flex;
  flex-direction: column;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--card);
  color: inherit;
  font: inherit;
  text-align: left;
  overflow: hidden;
  cursor: pointer;
  transition: border-color .12s, box-shadow .12s, transform .12s;
}

.card:hover { border-color: var(--line-2); box-shadow: var(--shadow); transform: translateY(-1px); }

.card__thumb {
  display: flex;
  align-items: center;
  justify-content: center;
  aspect-ratio: 4 / 3;
  background: var(--paper-2);
  overflow: hidden;
}

.card__thumb img { width: 100%; height: 100%; object-fit: cover; display: block; }

.card__body { display: flex; flex-direction: column; gap: 5px; padding: 10px 12px 13px; }

.card__title {
  font-size: 13.5px;
  line-height: 1.45;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  word-break: break-word;
}

.card__meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  color: var(--ink-2);
  font-size: 12px;
}

/* 行（列表视图） */
.row {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr) 96px 148px;
  align-items: center;
  gap: 14px;
  width: 100%;
  padding: 7px 10px;
  border: 1px solid transparent;
  border-radius: 8px;
  background: none;
  color: inherit;
  font: inherit;
  text-align: left;
  cursor: pointer;
}

.row:hover { background: var(--card); border-color: var(--line); }

.row__icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 8px;
  background: var(--paper-2);
  overflow: hidden;
}

.row__icon img { width: 100%; height: 100%; object-fit: cover; display: block; }

.row__title { font-size: 14px; word-break: break-word; }
.row__size, .row__date { color: var(--ink-2); font-size: 12.5px; text-align: right; }

.row__head {
  color: var(--ink-3);
  font-size: 12px;
  padding: 0 10px 6px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 6px;
}

.row__head .row__size, .row__head .row__date { text-align: right; }

/* 类型徽标 */
.badge {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
  min-height: 44px;
  background: var(--k, var(--k-other));
  color: #fff;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .02em;
}

.card__thumb .badge { min-height: 100%; font-size: 15px; }

.k-image   { --k: var(--k-image); }
.k-sheet   { --k: var(--k-sheet); }
.k-doc     { --k: var(--k-doc); }
.k-slide   { --k: var(--k-slide); }
.k-pdf     { --k: var(--k-pdf); }
.k-text    { --k: var(--k-text); }
.k-archive { --k: var(--k-archive); }
.k-other   { --k: var(--k-other); }
.k-folder  { --k: var(--k-folder); }

.folder-glyph { color: var(--k-folder); }

.tag-warn {
  flex-shrink: 0;
  padding: 1px 6px;
  border: 1px solid var(--k-archive);
  border-radius: 4px;
  color: var(--k-archive);
  font-size: 11px;
  white-space: nowrap;
}

/* ---------- 预览器 ---------- */

.viewer {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  flex-direction: column;
  background: rgba(18, 16, 14, .95);
  overscroll-behavior: contain;
}

.viewer__bar {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  padding: 10px 16px;
  background: rgba(18, 16, 14, .8);
  border-bottom: 1px solid rgba(250, 248, 244, .14);
  color: #FAF8F4;
}

.viewer__info { flex: 1; min-width: 0; }

.viewer__name {
  font-size: 14.5px;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.viewer__sub { color: rgba(250, 248, 244, .6); font-size: 12px; }

.viewer__actions { display: flex; align-items: center; gap: 8px; flex-shrink: 0; }

.viewer__actions .btn {
  background: rgba(250, 248, 244, .1);
  border-color: rgba(250, 248, 244, .28);
  color: #FAF8F4;
}

.viewer__actions .btn:hover { background: rgba(250, 248, 244, .2); }

.viewer__actions .btn--primary {
  background: var(--brand);
  border-color: var(--brand);
  color: #fff;
}

.viewer__actions .btn--primary:hover { background: var(--brand-dark); }

.viewer__stage {
  position: relative;
  flex: 1;
  min-height: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  touch-action: none;
}

.viewer__stage--doc {
  display: block;
  overflow: auto;
  touch-action: auto;
  padding: 24px 16px 60px;
}

.viewer__transform { transform-origin: center center; will-change: transform; cursor: grab; }
.viewer__transform:active { cursor: grabbing; }
.viewer__transform img { display: block; user-select: none; -webkit-user-drag: none; }

.viewer__hint {
  padding: 6px 16px 10px;
  text-align: center;
  color: rgba(250, 248, 244, .45);
  font-size: 12px;
}

/* 文档模式：白纸卡片 */
.sheet {
  max-width: 900px;
  margin: 0 auto;
  padding: 34px 38px 44px;
  background: #fff;
  color: var(--ink);
  border-radius: var(--radius);
  box-shadow: 0 12px 40px rgba(0, 0, 0, .35);
}

.sheet h1, .sheet h2, .sheet h3, .sheet h4 { line-height: 1.35; margin: 1.4em 0 .6em; }
.sheet h1 { font-size: 23px; }
.sheet h2 { font-size: 19px; }
.sheet h3 { font-size: 16.5px; }
.sheet p { margin: 0 0 .9em; }
.sheet ul, .sheet ol { margin: 0 0 .9em; padding-left: 1.5em; }
.sheet img { max-width: 100%; height: auto; }
.sheet table { border-collapse: collapse; margin: 0 0 1em; max-width: 100%; }
.sheet th, .sheet td { border: 1px solid var(--line-2); padding: 6px 10px; font-size: 13.5px; text-align: left; }
.sheet th { background: var(--paper-2); font-weight: 600; }

.tablewrap { overflow-x: auto; }

.tabs { display: flex; gap: 4px; flex-wrap: wrap; margin-bottom: 18px; }

.tab {
  padding: 5px 12px;
  border: 1px solid var(--line-2);
  border-radius: 999px;
  background: var(--card);
  color: var(--ink-2);
  font: inherit;
  font-size: 13px;
  cursor: pointer;
}

.tab[aria-selected="true"] { background: var(--brand); border-color: var(--brand); color: #fff; }

.sheet pre, .plain {
  margin: 0;
  font-family: ui-monospace, "Cascadia Code", Consolas, "Courier New", monospace;
  font-size: 13px;
  line-height: 1.65;
  white-space: pre-wrap;
  word-break: break-word;
}

.notice {
  max-width: 520px;
  margin: 12vh auto 0;
  padding: 30px 32px;
  background: #fff;
  color: var(--ink);
  border-radius: var(--radius);
  text-align: center;
  line-height: 1.8;
}

.notice__title { margin: 0 0 8px; font-size: 17px; font-weight: 600; }
.notice__text { margin: 0 0 18px; color: var(--ink-2); font-size: 13.5px; }

.spinner {
  display: inline-block;
  width: 18px;
  height: 18px;
  margin-right: 8px;
  border: 2px solid var(--line-2);
  border-top-color: var(--brand);
  border-radius: 50%;
  animation: spin .8s linear infinite;
  vertical-align: -3px;
}

@keyframes spin { to { transform: rotate(360deg); } }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}

/* ---------- 窄屏 ---------- */

@media (max-width: 700px) {
  .topbar__inner { padding: 9px 12px; gap: 10px; flex-wrap: wrap; }
  .topbar__tools { gap: 6px; }
  .select { min-height: 34px; font-size: 13px; }
  .btn { min-height: 34px; padding: 0 11px; font-size: 13px; }
  .btn--icon { min-width: 34px; }
  .folderbar { padding: 0 12px 9px; }

  .listing { padding: 12px 12px 48px; }
  .listing--grid { grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); gap: 11px; }
  .card__body { padding: 8px 10px 11px; }
  .card__title { font-size: 12.5px; }

  .row { grid-template-columns: 40px minmax(0, 1fr) 74px; gap: 10px; padding: 7px 8px; }
  .row__date, .row__head .row__date { display: none; }
  .row__icon { width: 40px; height: 40px; }

  .viewer__bar { padding: 8px 10px; gap: 10px; }
  .viewer__actions { gap: 6px; }
  .viewer__stage--doc { padding: 12px 8px 48px; }
  .sheet { padding: 20px 16px 30px; border-radius: 8px; }
}