/* imgfit 前端共享样式 —— 套件外壳，图片域五个页面与 PDF 域三个页面共用。
   设计令牌与各页面保持一致；跨域的差异样式写在各自域的 css 里
   （PDF 域在 pdffit/static/pdf.css）。 */

:root {
  --bg: #F4F5F7;
  --panel: #FFFFFF;
  --panel-2: #FAFBFC;
  --border: #E5E7EB;
  --border-strong: #D5D8DE;
  --text: #1F2328;
  --muted: #6B7280;
  --faint: #9AA1AC;
  --accent: #2B5CE6;
  --accent-soft: #EDF2FF;
  --accent-line: #C7D7FF;
  --ok: #12805C;
  --danger: #C0392B;
  --radius: 12px;
  --shadow: 0 1px 2px rgba(16,24,40,.04), 0 6px 18px rgba(16,24,40,.06);
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg); color: var(--text);
  font: 14px/1.6 -apple-system, BlinkMacSystemFont, "PingFang SC", "Helvetica Neue", "Microsoft YaHei", sans-serif;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; }
.hide { display: none !important; }

/* ---------- 顶栏 ---------- */
header.top {
  position: sticky; top: 0; z-index: 30;
  background: rgba(255,255,255,.88);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--border);
}
.top-inner { max-width: 1400px; margin: 0 auto; padding: 12px 24px; display: flex; align-items: center; gap: 12px; }
.logo {
  width: 32px; height: 32px; border-radius: 9px; flex: none;
  background: linear-gradient(135deg, #2B5CE6, #6E8CFF);
  display: grid; place-items: center; color: #fff; font-weight: 700; font-size: 15px;
  box-shadow: 0 3px 10px rgba(43,92,230,.28);
}
header.top h1 { font-size: 15px; margin: 0; font-weight: 600; }
header.top .sub { font-size: 12px; color: var(--muted); margin-top: 1px; }
.tabs { display: flex; gap: 3px; background: #F0F1F4; border-radius: 9px; padding: 3px; margin-left: 10px; flex-wrap: wrap; }
.tabs a { padding: 6px 13px; border-radius: 7px; font-size: 12.5px; color: var(--muted); transition: all .15s; white-space: nowrap; }
.tabs a:hover { color: var(--text); }
.tabs a.active { background: #fff; color: var(--text); font-weight: 600; box-shadow: 0 1px 3px rgba(16,24,40,.10); }
/* 导航分组：图片域与 PDF 域各一排，用竖线隔开。
   两域的 "无缝拼接" 与 "PDF 合并" 名字相近，分组标签是唯一的区分线索，
   去掉它用户很容易点错。 */
.tabs .nav-group {
  align-self: center; padding: 0 3px 0 7px;
  font-size: 10px; letter-spacing: .6px; color: var(--faint); font-weight: 600;
}
.tabs .nav-sep { width: 1px; align-self: stretch; margin: 4px 4px; background: var(--border-strong); }
.top-inner .ver { margin-left: auto; font-size: 12px; color: var(--faint); font-variant-numeric: tabular-nums; }
@media (max-width: 780px) { .top-inner { flex-wrap: wrap; } .top-inner .ver { margin-left: 0; } }

/* ---------- 布局 ---------- */
.layout {
  max-width: 1400px; margin: 0 auto; padding: 20px 24px 64px;
  display: grid; grid-template-columns: 336px 1fr; gap: 20px; align-items: start;
}
@media (max-width: 980px) {
  .layout { grid-template-columns: 1fr; padding: 16px 14px 48px; }
  aside.panel { position: static !important; }
}

/* ---------- 控制面板 ---------- */
aside.panel {
  position: sticky; top: 70px;
  background: var(--panel); border: 1px solid var(--border);
  border-radius: var(--radius); box-shadow: var(--shadow);
  padding: 4px 0; max-height: calc(100vh - 96px); overflow-y: auto;
}
aside.panel::-webkit-scrollbar { width: 8px; }
aside.panel::-webkit-scrollbar-thumb { background: #DCDFE5; border-radius: 8px; }
.group { padding: 14px 16px; border-bottom: 1px solid #F0F1F4; }
.group:last-child { border-bottom: none; }
.group > .label {
  font-size: 12px; font-weight: 600; color: var(--muted);
  letter-spacing: .4px; margin-bottom: 10px; display: flex; align-items: center; gap: 6px;
}
.group > .label .hint { font-weight: 400; color: var(--faint); letter-spacing: 0; }

.chips { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.chip {
  border: 1px solid var(--border); background: var(--panel-2);
  border-radius: 9px; padding: 8px 10px; cursor: pointer; text-align: left;
  transition: all .15s ease; font-family: inherit; color: var(--text);
}
.chip:hover { border-color: var(--accent-line); background: #fff; }
.chip.active { border-color: var(--accent); background: var(--accent-soft); box-shadow: 0 0 0 1px var(--accent) inset; }
.chip .t { display: block; font-size: 13px; font-weight: 600; }
.chip .d { display: block; font-size: 11px; color: var(--faint); font-variant-numeric: tabular-nums; }
.chip.active .d { color: #6B84CC; }
.badge {
  display: inline-block; margin-left: 5px; padding: 0 5px; border-radius: 5px;
  background: var(--accent); color: #fff; font-size: 9.5px; font-weight: 500;
  vertical-align: 1px; letter-spacing: .2px;
}

.seg { display: flex; background: #F0F1F4; border-radius: 9px; padding: 3px; gap: 3px; }
.seg button {
  flex: 1; border: 0; background: transparent; border-radius: 7px; padding: 8px 4px;
  font: inherit; font-size: 12.5px; color: var(--muted); cursor: pointer; transition: all .15s;
}
.seg button:hover { color: var(--text); }
.seg button.active { background: #fff; color: var(--text); font-weight: 600; box-shadow: 0 1px 3px rgba(16,24,40,.10); }
.seg button:disabled { opacity: .4; cursor: not-allowed; }
.seg-desc { font-size: 11.5px; color: var(--faint); margin-top: 8px; line-height: 1.5; }

.slider { margin-bottom: 13px; }
.slider:last-child { margin-bottom: 2px; }
.slider .row { display: flex; justify-content: space-between; align-items: baseline; margin-bottom: 5px; }
.slider .row .n { font-size: 12.5px; color: #4B5563; display: flex; align-items: center; gap: 6px; }
.slider .row .v { font-size: 12px; color: var(--muted); font-variant-numeric: tabular-nums; }
input[type=range] {
  -webkit-appearance: none; appearance: none; width: 100%; height: 4px; border-radius: 4px;
  background: #E3E6EB; outline: none; margin: 0;
}
input[type=range]::-webkit-slider-runnable-track { height: 4px; border-radius: 4px; background: #E3E6EB; }
input[type=range]:disabled::-webkit-slider-runnable-track { background: #EDEFF2; }
input[type=range]::-webkit-slider-thumb {
  -webkit-appearance: none; width: 15px; height: 15px; border-radius: 50%; margin-top: -5.5px;
  background: #fff; border: 2px solid var(--accent); cursor: pointer;
  box-shadow: 0 1px 4px rgba(16,24,40,.22); transition: transform .12s;
}
input[type=range]::-webkit-slider-thumb:hover { transform: scale(1.12); }
input[type=range]:disabled { opacity: .45; }
input[type=range]:disabled::-webkit-slider-thumb { cursor: not-allowed; border-color: #9AA1AC; }

.inline { display: flex; align-items: center; justify-content: space-between; gap: 10px; }
select, input[type=text], input[type=number] {
  padding: 7px 9px; border: 1px solid var(--border); border-radius: 8px; font: inherit;
  background: var(--panel-2); color: var(--text); font-family: inherit;
}
select { cursor: pointer; }
input[type=text]:focus, input[type=number]:focus, select:focus { outline: none; border-color: var(--accent); background: #fff; }
input.text-full { width: 100%; }
.switch { display: inline-flex; align-items: center; gap: 7px; cursor: pointer; font-size: 12.5px; color: #4B5563; }
.switch input { accent-color: var(--accent); width: 15px; height: 15px; cursor: pointer; }
.swatches { display: flex; gap: 7px; margin-top: 10px; flex-wrap: wrap; }
.swatch {
  width: 26px; height: 26px; border-radius: 8px; cursor: pointer; flex: none;
  border: 1px solid rgba(0,0,0,.10); transition: transform .12s;
}
.swatch:hover { transform: scale(1.08); }
.swatch.active { box-shadow: 0 0 0 2px #fff, 0 0 0 3.5px var(--accent); }

.btn {
  border: 1px solid var(--border); background: #fff; color: var(--text);
  border-radius: 9px; padding: 8px 12px; font: inherit; font-size: 13px;
  cursor: pointer; transition: all .15s; display: inline-flex; align-items: center; gap: 6px;
  justify-content: center;
}
.btn:hover { border-color: var(--border-strong); background: var(--panel-2); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; font-weight: 500; }
.btn.primary:hover { background: #2350CC; border-color: #2350CC; }
.btn:disabled { opacity: .45; cursor: not-allowed; }
.btn.ghost { border-color: transparent; background: transparent; color: var(--muted); }
.btn.ghost:hover { background: #F0F1F4; color: var(--text); }
.btn.block { width: 100%; }
.btn.sm { padding: 5px 9px; font-size: 12px; }

/* ---------- 主区 ---------- */
main { min-width: 0; }
.dropzone {
  background: var(--panel); border: 2px dashed var(--border-strong); border-radius: 16px;
  padding: 60px 28px; text-align: center; cursor: pointer; transition: all .18s ease;
}
.dropzone:hover { border-color: var(--accent-line); background: #FCFDFF; }
.dropzone.drag { border-color: var(--accent); background: var(--accent-soft); transform: scale(.995); }
.dz-icon {
  width: 52px; height: 52px; margin: 0 auto 16px; border-radius: 14px;
  background: var(--accent-soft); display: grid; place-items: center; color: var(--accent);
}
.dz-title { font-size: 16px; font-weight: 600; margin-bottom: 6px; }
.dz-desc { color: var(--muted); font-size: 13px; }
.dz-desc kbd {
  background: #F0F1F4; border: 1px solid var(--border); border-bottom-width: 2px;
  border-radius: 5px; padding: 1px 5px; font-size: 11.5px; font-family: inherit;
}
.dz-demo { margin-top: 18px; display: flex; gap: 8px; justify-content: center; flex-wrap: wrap; }

/* 显示 / 隐藏**只用 `.hide`**（见文件顶部，带 !important）。
   注意：这里曾经照着 collage.html 抄了 `.stage{display:none}` + `.stage.show{display:block}`，
   但那套要配合 `classList.toggle("show")` 才行；本页组用的是 app.js 的 `App.show()`，
   它切的是 `.hide` —— 两套机制打架的后果是 stage 永远 display:none，
   上传后 dropzone 又被加上 .hide，于是右侧整片空白、且不报任何错。
   `.stage` 本身默认 display:block，靠 HTML 上的初始 `class="stage hide"` 保持隐藏。 */
.toolbar {
  display: flex; align-items: center; gap: 10px; flex-wrap: wrap;
  background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 10px 14px; box-shadow: var(--shadow); margin-bottom: 14px;
}
.toolbar .stat { font-size: 13px; color: var(--muted); }
.toolbar .stat b { color: var(--text); font-weight: 600; }
.toolbar .spacer { flex: 1; }
.tagline {
  font-size: 11.5px; padding: 3px 8px; border-radius: 6px;
  background: var(--accent-soft); color: #2B5CE6; font-weight: 500;
}

.preview-box {
  background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 20px; display: grid; place-items: center; min-height: 420px;
  position: relative;
}
.preview-box img {
  max-width: 100%; max-height: 66vh; display: block; border-radius: 4px;
  box-shadow: 0 10px 34px rgba(16,24,40,.14);
}
.preview-box.busy img { opacity: .45; }
.preview-box .spin {
  position: absolute; width: 30px; height: 30px; border-radius: 50%;
  border: 3px solid rgba(43,92,230,.18); border-top-color: var(--accent);
  animation: spin .7s linear infinite; display: none;
}
.preview-box.busy .spin { display: block; }
@keyframes spin { to { transform: rotate(360deg); } }
.preview-empty { color: var(--muted); font-size: 13.5px; text-align: center; line-height: 1.8; }

.section-title {
  font-size: 12px; font-weight: 600; color: var(--muted); letter-spacing: .4px;
  margin: 22px 0 10px; display: flex; align-items: center; gap: 8px;
}
.section-title .hint { font-weight: 400; color: var(--faint); letter-spacing: 0; }

/* ---------- 可拖拽排序的图片卡片 ---------- */
.sources { display: flex; flex-wrap: wrap; gap: 12px; }
.src {
  position: relative; width: 108px; background: var(--panel);
  border: 1px solid var(--border); border-radius: 11px; padding: 7px;
  box-shadow: var(--shadow); transition: border-color .15s;
  cursor: grab; touch-action: pan-y;
}
.src:hover { border-color: var(--accent-line); }
.src.dragging { opacity: .34; cursor: grabbing; border-color: var(--accent); box-shadow: none; transition: none; }
.src.dragging * { pointer-events: none; }
.src.drop-before::before,
.src.drop-after::after {
  content: ""; position: absolute; top: 3px; bottom: 3px; width: 3px;
  border-radius: 2px; background: var(--accent); z-index: 4;
}
.src.drop-before::before { left: -8px; }
.src.drop-after::after { right: -8px; }
.src .num {
  position: absolute; left: 12px; top: 12px; z-index: 2;
  background: rgba(31,35,40,.78); color: #fff; font-size: 11px;
  min-width: 18px; height: 18px; border-radius: 6px; display: grid; place-items: center;
  padding: 0 4px; font-variant-numeric: tabular-nums;
}
.src .thumb {
  height: 92px; border-radius: 7px; overflow: hidden; background: #EDEFF2;
  display: grid; place-items: center;
}
.src .thumb img { max-width: 100%; max-height: 100%; display: block; -webkit-user-drag: none; user-select: none; }
.src .cap {
  font-size: 10.5px; color: var(--muted); margin-top: 6px; white-space: nowrap;
  overflow: hidden; text-overflow: ellipsis; text-align: center;
}
.src .acts { display: flex; gap: 4px; margin-top: 6px; }
.src .acts button {
  flex: 1; border: 1px solid var(--border); background: #fff; border-radius: 6px;
  padding: 3px 0; font: inherit; font-size: 11px; color: var(--muted); cursor: pointer;
  transition: all .13s; line-height: 1.3;
}
.src .acts button:hover { background: var(--panel-2); color: var(--text); }
.src .acts button.del:hover { color: var(--danger); border-color: #E9BDB6; background: #FDF3F1; }
.src .acts button:disabled { opacity: .35; cursor: not-allowed; }

/* ---------- 统计卡片 ---------- */
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 12px; margin-bottom: 14px; }
.stat-card {
  background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 13px 15px;
}
.stat-card .k { font-size: 11.5px; color: var(--faint); letter-spacing: .3px; }
.stat-card .v { font-size: 19px; font-weight: 600; margin-top: 3px; font-variant-numeric: tabular-nums; }
.stat-card .v small { font-size: 12px; font-weight: 400; color: var(--muted); }
.stat-card.good .v { color: var(--ok); }

/* ---------- 提示 ---------- */
.toast-wrap { position: fixed; right: 20px; bottom: 20px; z-index: 90; display: flex; flex-direction: column; gap: 8px; }
.toast {
  background: #1F2328; color: #fff; padding: 10px 14px; border-radius: 10px; font-size: 13px;
  box-shadow: 0 8px 24px rgba(16,24,40,.22); animation: pop .22s ease; max-width: 380px;
}
.toast.err { background: #B6291C; }
@keyframes pop { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }