/* ============================================================
   4U STUDIO — 后台样式
   ============================================================ */

:root {
  --paper: #f7f5f2;
  --surface: #ffffff;
  --ink: #1a1917;
  --ink-2: #55514c;
  --ink-3: #918b83;
  --line: #e4dfd8;
  --line-2: #efece7;
  --accent: #1a1917;
  --danger: #a4443c;
  --ok: #4a7a5a;

  --sans: -apple-system, BlinkMacSystemFont, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --serif: "Songti SC", "Source Han Serif SC", Georgia, serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 13.5px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

[hidden] { display: none !important; }

button { font: inherit; color: inherit; cursor: pointer; }

:focus-visible { outline: 1px solid var(--ink); outline-offset: 2px; }

/* ---------------------------- 登录 ---------------------------- */

.login-wrap {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
}

.login-card {
  width: 100%;
  max-width: 340px;
  background: var(--surface);
  border: 1px solid var(--line);
  padding: 40px 32px 34px;
}

.login-card .mark {
  font-family: var(--serif);
  font-size: 14px;
  letter-spacing: 0.34em;
  text-transform: uppercase;
  margin: 0 0 6px;
}

.login-card .sub {
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--ink-3);
  text-transform: uppercase;
  margin: 0 0 30px;
}

.login-card input {
  width: 100%;
  padding: 11px 13px;
  border: 1px solid var(--line);
  background: #fff;
  font: inherit;
  margin-bottom: 12px;
}

.login-card button {
  width: 100%;
  padding: 11px;
  border: 0;
  background: var(--ink);
  color: #f7f5f2;
  letter-spacing: 0.14em;
  font-size: 12px;
  text-transform: uppercase;
  transition: opacity 0.3s;
}
.login-card button:hover { opacity: 0.85; }
.login-card button:disabled { opacity: 0.5; cursor: default; }

.err {
  color: var(--danger);
  font-size: 12px;
  min-height: 18px;
  margin: 10px 0 0;
}

/* ---------------------------- 框架 ---------------------------- */

.app-bar {
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  background: var(--surface);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 30;
}

.app-bar .brand {
  font-family: var(--serif);
  font-size: 13px;
  letter-spacing: 0.3em;
  text-transform: uppercase;
}
.app-bar .brand span {
  font-family: var(--sans);
  letter-spacing: 0.14em;
  color: var(--ink-3);
  font-size: 11px;
  margin-left: 10px;
}

.app-bar .right { display: flex; align-items: center; gap: 16px; font-size: 12px; }
.app-bar .right a { color: var(--ink-2); text-decoration: none; border-bottom: 1px solid var(--line); padding-bottom: 1px; }
.app-bar .right a:hover { border-color: var(--ink-3); }

.mode-tag {
  font-size: 10.5px;
  letter-spacing: 0.1em;
  color: var(--ink-3);
  border: 1px solid var(--line);
  padding: 3px 8px;
  text-transform: uppercase;
}

.ghost {
  background: transparent;
  border: 1px solid var(--line);
  padding: 5px 12px;
  font-size: 12px;
  color: var(--ink-2);
  transition: border-color 0.3s, color 0.3s;
}
.ghost:hover { border-color: var(--ink-3); color: var(--ink); }

.app-body {
  display: grid;
  grid-template-columns: 248px minmax(0, 1fr);
  height: calc(100vh - 56px);
}

/* ---------------------------- 左侧项目列表 ---------------------------- */

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

.side-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 16px 12px;
  border-bottom: 1px solid var(--line-2);
  font-size: 10.5px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-3);
}

.side-head button {
  border: 1px solid var(--line);
  background: transparent;
  padding: 3px 9px;
  font-size: 11.5px;
  letter-spacing: 0;
  color: var(--ink-2);
  text-transform: none;
}
.side-head button:hover { border-color: var(--ink-3); color: var(--ink); }

.plist {
  list-style: none;
  margin: 0;
  padding: 6px;
  overflow-y: auto;
  flex: 1;
}

.plist li {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px;
  border-radius: 2px;
  cursor: pointer;
  user-select: none;
  transition: background 0.2s;
}
.plist li:hover { background: var(--paper); }
.plist li.is-active { background: var(--paper); box-shadow: inset 2px 0 0 var(--ink); }
.plist li.dragging { opacity: 0.4; }
.plist li.drag-over { box-shadow: inset 0 2px 0 var(--ink); }

.plist .thumb {
  width: 38px;
  height: 30px;
  background: var(--line-2);
  flex: 0 0 auto;
  overflow: hidden;
}
.plist .thumb img { width: 100%; height: 100%; object-fit: cover; display: block; }

.plist .txt { min-width: 0; flex: 1; }
.plist .txt b {
  display: block;
  font-weight: 500;
  font-size: 12.5px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.plist .txt small { color: var(--ink-3); font-size: 10.5px; letter-spacing: 0.06em; }

.plist .dot {
  width: 5px; height: 5px; border-radius: 50%;
  background: var(--line); flex: 0 0 auto;
}
.plist .dot.on { background: var(--ok); }

/* ---------------------------- 编辑区 ---------------------------- */

.editor {
  overflow-y: auto;
  padding: 26px clamp(20px, 3vw, 40px) 90px;
  min-height: 0;
}

.editor-inner { max-width: 880px; }

.empty-pane {
  display: grid;
  place-items: center;
  height: 100%;
  color: var(--ink-3);
  font-size: 13px;
  letter-spacing: 0.06em;
}

.field-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 20px;
}

.field { display: flex; flex-direction: column; gap: 6px; }
.field.full { grid-column: 1 / -1; }

.field label {
  font-size: 10.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-3);
}

.field input[type="text"],
.field input[type="number"],
.field textarea,
.field select {
  width: 100%;
  padding: 9px 11px;
  border: 1px solid var(--line);
  background: #fff;
  font: inherit;
  font-size: 13.5px;
  color: var(--ink);
  border-radius: 2px;
}
.field textarea { resize: vertical; min-height: 96px; line-height: 1.75; }
.field input:focus, .field textarea:focus, .field select:focus {
  outline: none;
  border-color: var(--ink-3);
}
.field .hint { font-size: 11px; color: var(--ink-3); }

.switch {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 12.5px;
  color: var(--ink-2);
  cursor: pointer;
}
.switch input { width: 15px; height: 15px; accent-color: #1a1917; }

.section-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin: 34px 0 14px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
}

.section-bar h2 {
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-2);
  font-weight: 500;
  margin: 0;
}

.btn {
  border: 0;
  background: var(--ink);
  color: #f7f5f2;
  padding: 9px 20px;
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  text-decoration: none;
  display: inline-block;
}
.btn:hover { opacity: 0.86; }
.btn:disabled { opacity: 0.45; cursor: default; }

.btn-line {
  background: transparent;
  border: 1px solid var(--line);
  color: var(--ink-2);
  padding: 8px 16px;
  font-size: 12px;
}
.btn-line:hover { border-color: var(--ink-3); color: var(--ink); }

.btn-danger { color: var(--danger); border-color: #e8d7d5; }
.btn-danger:hover { border-color: var(--danger); color: var(--danger); }

/* ---------------------------- 上传区 ---------------------------- */

.dropzone {
  border: 1px dashed #cfc8bf;
  background: #fff;
  padding: 34px 20px;
  text-align: center;
  transition: border-color 0.25s, background 0.25s;
  cursor: pointer;
  margin-bottom: 18px;
}
.dropzone:hover, .dropzone.is-over { border-color: var(--ink-3); background: #fdfcfa; }
.dropzone strong { display: block; font-weight: 500; font-size: 13px; margin-bottom: 4px; }
.dropzone span { font-size: 11.5px; color: var(--ink-3); }

.uploads { list-style: none; margin: 0 0 20px; padding: 0; }
.uploads li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 12px;
  padding: 6px 0;
  border-bottom: 1px solid var(--line-2);
  color: var(--ink-2);
}
.uploads .name { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.uploads .bar { width: 120px; height: 3px; background: var(--line-2); flex: 0 0 auto; }
.uploads .bar i { display: block; height: 100%; width: 0; background: var(--ink); transition: width 0.2s linear; }
.uploads .pct { width: 38px; text-align: right; font-variant-numeric: tabular-nums; color: var(--ink-3); }
.uploads .sizes {
  flex: 0 0 auto;
  font-size: 10.5px;
  color: var(--ink-3);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}
.uploads .sizes:empty { display: none; }
.uploads li.done .pct { color: var(--ok); }
.uploads li.fail .pct { color: var(--danger); }

/* ---------------------------- 图片网格 ---------------------------- */

.photo-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(132px, 1fr));
  gap: 10px;
}

.ph {
  position: relative;
  background: #fff;
  border: 1px solid var(--line-2);
  aspect-ratio: 4 / 3;
  overflow: hidden;
  cursor: grab;
  transition: box-shadow 0.2s, opacity 0.2s;
}
.ph.dragging { opacity: 0.35; cursor: grabbing; }
.ph.is-cover { box-shadow: inset 0 0 0 2px var(--ink); }

.ph img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  pointer-events: none;
}

.ph .idx {
  position: absolute;
  top: 4px; left: 5px;
  font-size: 10px;
  color: #fff;
  background: rgba(20, 19, 18, 0.55);
  padding: 1px 5px;
  letter-spacing: 0.06em;
}

.ph .cover-badge {
  position: absolute;
  top: 4px; right: 5px;
  font-size: 9.5px;
  letter-spacing: 0.08em;
  background: rgba(20, 19, 18, 0.82);
  color: #f7f5f2;
  padding: 1px 5px;
  text-transform: uppercase;
}

.ph .ops {
  position: absolute;
  inset: auto 0 0 0;
  display: flex;
  background: rgba(20, 19, 18, 0.82);
  opacity: 0;
  transition: opacity 0.2s;
}
.ph:hover .ops { opacity: 1; }

.ph .ops button {
  flex: 1;
  border: 0;
  background: transparent;
  color: #efebe6;
  font-size: 10.5px;
  padding: 6px 2px;
  letter-spacing: 0.05em;
}
.ph .ops button:hover { background: rgba(255, 255, 255, 0.12); }

.ph .ops button[data-act="del"]:hover { color: #e8a7a1; }

/* ---------------------------- 浮动提示 ---------------------------- */

.toast {
  position: fixed;
  left: 50%;
  bottom: 34px;
  transform: translate(-50%, 14px);
  background: var(--ink);
  color: #f7f5f2;
  padding: 10px 20px;
  font-size: 12.5px;
  letter-spacing: 0.04em;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s, transform 0.3s;
  z-index: 400;
  max-width: 80vw;
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }
.toast.err { background: var(--danger); }

/* ---------------------------- 响应式 ---------------------------- */

@media (max-width: 820px) {
  .app-body { grid-template-columns: 1fr; height: auto; }
  .side {
    border-right: 0;
    border-bottom: 1px solid var(--line);
    max-height: 42vh;
  }
  .editor { padding: 20px 16px 80px; }
  .field-grid { grid-template-columns: 1fr; }
  .mode-tag { display: none; }
}