/* =================================================================
   照片瀑布流 · 样式表
   纯本地资源，不引用任何 CDN 字体或图标库
   ================================================================= */

/* ---------------- 设计变量 ---------------- */

/* 装饰性图标 SVG 不拦截鼠标事件：点击会穿透到父按钮/链接，
   避免“点到 SVG 而非按钮”导致 data-close 等判断失效。 */
button svg, a svg, .user-chip svg, .modal-close svg, .lb-btn svg { pointer-events: none; }

:root {
  --bg:            #f7f7f8;
  --bg-elev:       #ffffff;
  --bg-sunken:     #f0f0f2;
  --text:          #17181c;
  --text-soft:     #5f6470;
  --text-faint:    #91959f;
  --border:        #e5e6ea;
  --border-strong: #d3d5db;
  --accent:        #17181c;
  --accent-text:   #ffffff;
  --accent-soft:   rgba(23, 24, 28, .06);
  --focus:         #4b6bfb;
  --danger:        #d92d20;
  --danger-soft:   #fee4e2;
  --shadow-sm:     0 1px 2px rgba(16, 18, 27, .05);
  --shadow-md:     0 4px 16px rgba(16, 18, 27, .08);
  --shadow-lg:     0 18px 48px rgba(16, 18, 27, .16);
  --radius:        14px;
  --radius-sm:     10px;
  --topbar-h:      64px;
  --skeleton-a:    #eceef1;
  --skeleton-b:    #f6f7f8;
  --header-bg:     rgba(255, 255, 255, .82);
}

[data-theme="dark"] {
  --bg:            #0e0f12;
  --bg-elev:       #17191d;
  --bg-sunken:     #202329;
  --text:          #eceef2;
  --text-soft:     #a3a8b4;
  --text-faint:    #71767f;
  --border:        #282c33;
  --border-strong: #3a3f48;
  --accent:        #f2f3f5;
  --accent-text:   #101216;
  --accent-soft:   rgba(255, 255, 255, .08);
  --focus:         #6c8bff;
  --danger:        #ff6b5e;
  --danger-soft:   rgba(255, 107, 94, .16);
  --shadow-sm:     0 1px 2px rgba(0, 0, 0, .4);
  --shadow-md:     0 4px 18px rgba(0, 0, 0, .45);
  --shadow-lg:     0 20px 56px rgba(0, 0, 0, .6);
  --skeleton-a:    #202329;
  --skeleton-b:    #282c33;
  --header-bg:     rgba(14, 15, 18, .8);
}

/* ---------------- 基础 ---------------- */

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

/* hidden 属性优先级要高于组件自身的 display，否则显隐切换会失效 */
[hidden] { display: none !important; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
               "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC",
               "Noto Sans CJK SC", Roboto, Helvetica, Arial, sans-serif;
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body.no-scroll { overflow: hidden; }

img { display: block; max-width: 100%; }

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

a { color: inherit; text-decoration: none; }

:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
  border-radius: 6px;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 8px;
  z-index: 200;
  background: var(--bg-elev);
  padding: 8px 14px;
  border-radius: 8px;
  box-shadow: var(--shadow-md);
}
.skip-link:focus { left: 12px; }

/* ---------------- 顶栏 ---------------- */

.topbar {
  position: sticky;
  top: 0;
  z-index: 60;
  background: var(--header-bg);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--border);
}

.topbar-inner {
  max-width: 1760px;
  margin: 0 auto;
  height: var(--topbar-h);
  padding: 0 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand { display: flex; align-items: center; gap: 11px; min-width: 0; }

.brand-mark {
  width: 34px;
  height: 34px;
  flex: none;
  display: grid;
  place-items: center;
  border-radius: 10px;
  background: var(--accent);
  color: var(--accent-text);
}
.brand-mark svg { width: 19px; height: 19px; }

.brand-text { display: flex; flex-direction: column; min-width: 0; line-height: 1.25; }
.brand-text strong {
  font-size: 16px;
  font-weight: 650;
  letter-spacing: .2px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.brand-text small {
  font-size: 12px;
  color: var(--text-faint);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.topbar-actions { display: flex; align-items: center; gap: 10px; }

.photo-count {
  font-size: 13px;
  color: var(--text-faint);
  font-variant-numeric: tabular-nums;
  padding-right: 2px;
}

/* ---------------- 按钮 ---------------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  height: 38px;
  padding: 0 15px;
  border: 1px solid transparent;
  border-radius: 10px;
  background: transparent;
  font-size: 14px;
  font-weight: 550;
  cursor: pointer;
  white-space: nowrap;
  transition: background .16s ease, border-color .16s ease,
              transform .12s ease, opacity .16s ease;
}
.btn svg { width: 16px; height: 16px; flex: none; }
.btn:active { transform: scale(.975); }
.btn[disabled] { opacity: .45; cursor: not-allowed; transform: none; }

.btn-primary { background: var(--accent); color: var(--accent-text); }
.btn-primary:hover:not([disabled]) { opacity: .88; }

.btn-ghost { border-color: var(--border-strong); color: var(--text-soft); }
.btn-ghost:hover { background: var(--accent-soft); color: var(--text); }

.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover:not([disabled]) { opacity: .9; }

.btn-block { width: 100%; height: 42px; }

.icon-btn {
  width: 38px;
  height: 38px;
  display: inline-grid;
  place-items: center;
  border: 1px solid transparent;
  border-radius: 10px;
  background: transparent;
  color: var(--text-soft);
  cursor: pointer;
  transition: background .16s ease, color .16s ease;
}
.icon-btn:hover { background: var(--accent-soft); color: var(--text); }
.icon-btn svg { width: 19px; height: 19px; }

#btn-theme .ico-moon { display: none; }
[data-theme="dark"] #btn-theme .ico-sun { display: none; }
[data-theme="dark"] #btn-theme .ico-moon { display: block; }

/* ---------------- 用户菜单 ---------------- */

.admin-only[data-auth="admin"] { display: flex; align-items: center; gap: 10px; }

.user-chip {
  position: relative;
  display: flex;
  align-items: center;
  gap: 7px;
  height: 38px;
  padding: 0 9px 0 5px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--bg-elev);
  cursor: pointer;
  user-select: none;
  transition: border-color .16s ease;
}
.user-chip:hover { border-color: var(--border-strong); }

.avatar {
  width: 27px;
  height: 27px;
  flex: none;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--accent);
  color: var(--accent-text);
  font-size: 12px;
  font-weight: 650;
  text-transform: uppercase;
}

.user-name {
  font-size: 13.5px;
  max-width: 110px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.user-chip .caret { width: 14px; height: 14px; color: var(--text-faint); transition: transform .18s ease; }
.user-chip.open .caret { transform: rotate(180deg); }

.user-menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  min-width: 168px;
  padding: 6px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-6px);
  transition: opacity .16s ease, transform .16s ease, visibility .16s;
}
.user-chip.open .user-menu { opacity: 1; visibility: visible; transform: none; }

.menu-item {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 9px 10px;
  border: 0;
  border-radius: 8px;
  background: transparent;
  font-size: 14px;
  text-align: left;
  cursor: pointer;
}
.menu-item svg { width: 16px; height: 16px; color: var(--text-faint); }
.menu-item:hover { background: var(--accent-soft); }

.menu-sep {
  height: 1px;
  margin: 5px 8px;
  background: var(--border);
}
.menu-item.menu-danger { color: var(--danger); }
.menu-item.menu-danger svg { color: var(--danger); }
.menu-item.menu-danger:hover { background: var(--danger-soft); }

.mono { font-family: var(--mono-font, ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace); }
.confirm-input {
  width: 100%;
  padding: 9px 11px;
  border: 1px solid var(--border);
  border-radius: 9px;
  background: var(--bg);
  color: var(--text);
  font-size: 15px;
  letter-spacing: 1px;
}
.confirm-input:focus {
  outline: none;
  border-color: var(--focus);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--focus) 18%, transparent);
}

/* ---------------- 页面容器 ---------------- */

.page {
  max-width: 1760px;
  margin: 0 auto;
  padding: 22px 20px 8px;
}

.notice-area { display: grid; gap: 10px; margin-bottom: 16px; }

.notice {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 11px 14px;
  border-radius: var(--radius-sm);
  font-size: 13.5px;
  border: 1px solid;
}
.notice-warn {
  background: rgba(245, 158, 11, .13);          /* 老浏览器兜底 */
  background: color-mix(in srgb, #f59e0b 13%, var(--bg-elev));
  border-color: rgba(245, 158, 11, .34);
  color: var(--text);
}
.notice-error {
  background: var(--danger-soft);
  border-color: rgba(217, 45, 32, .34);
  color: var(--text);
}
.notice code {
  padding: 1px 5px;
  border-radius: 5px;
  background: var(--accent-soft);
  font-size: 12.5px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}
.notice b { font-weight: 650; }

/* ---------------- 瀑布流 ---------------- */

.grid {
  position: relative;
  width: 100%;
  min-height: 40px;
  transition: height .28s cubic-bezier(.22, .61, .36, 1);
}
/* 窗口缩放 / 首屏铺设时不要做高度补间 */
.grid.layout-static { transition: none; }

.card {
  position: absolute;
  top: 0;
  left: 0;
  overflow: hidden;
  border-radius: var(--radius);
  background: var(--skeleton-a);
  box-shadow: var(--shadow-sm);
  cursor: zoom-in;
  will-change: transform;
  transform: translate3d(0, 0, 0);
  transition: transform .34s cubic-bezier(.22, .61, .36, 1),
              width .34s cubic-bezier(.22, .61, .36, 1),
              height .34s cubic-bezier(.22, .61, .36, 1),
              translate .34s cubic-bezier(.22, .61, .36, 1),
              scale .3s ease,
              box-shadow .2s ease,
              opacity .3s ease;
}
.card.no-anim { transition: box-shadow .2s ease, opacity .3s ease; }
.card:hover { box-shadow: var(--shadow-md); }

/* 入场动画：用独立的 translate 属性，避免和 JS 写入的 transform 打架 */
.card.enter   { opacity: 0; translate: 0 14px; }
.card.entered { opacity: 1; translate: 0 0; }

.card-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0;
  transition: opacity .45s ease, transform .5s cubic-bezier(.22, .61, .36, 1);
}
.card-img.loaded { opacity: 1; }
.card:hover .card-img.loaded { transform: scale(1.035); }

/* 视频卡片：沿用 .card-img 的尺寸/淡入，额外铺底变黑以承载首帧 */
.card-video { object-fit: cover; background: #000; }

/* 视频播放角标（居中，点击穿透到卡片本身） */
.card-play {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: rgba(18, 18, 20, .58);
  color: #fff;
  pointer-events: none;
  box-shadow: 0 4px 14px rgba(0, 0, 0, .4);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  transition: opacity .2s ease, transform .2s ease;
}
.card-play svg { width: 22px; height: 22px; margin-left: 2px; }
.card:hover .card-play { opacity: .82; transform: translate(-50%, -50%) scale(1.06); }

/* 骨架微光 */
.card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(100deg,
              var(--skeleton-a) 30%,
              var(--skeleton-b) 50%,
              var(--skeleton-a) 70%);
  background-size: 220% 100%;
  animation: shimmer 1.4s ease-in-out infinite;
  opacity: 1;
  transition: opacity .35s ease;
  pointer-events: none;
}
.card.is-loaded::before { opacity: 0; animation: none; }

@keyframes shimmer {
  0%   { background-position: 140% 0; }
  100% { background-position: -40% 0; }
}

/* 卡片底部信息条 */
.card-info {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 26px 12px 10px;
  background: linear-gradient(to top, rgba(0, 0, 0, .68), rgba(0, 0, 0, 0));
  color: #fff;
  font-size: 12px;
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 8px;
  opacity: 0;
  transform: translateY(6px);
  transition: opacity .22s ease, transform .22s ease;
  pointer-events: none;
}
.card:hover .card-info,
.card:focus-within .card-info { opacity: 1; transform: none; }

.card-name {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  text-shadow: 0 1px 3px rgba(0, 0, 0, .5);
}
.card-date { flex: none; opacity: .82; font-variant-numeric: tabular-nums; }

/* 卡片删除按钮 */
.card-del {
  position: absolute;
  top: 9px;
  right: 9px;
  width: 30px;
  height: 30px;
  display: none;
  place-items: center;
  border: 0;
  border-radius: 9px;
  background: rgba(18, 18, 20, .58);
  color: #fff;
  cursor: pointer;
  opacity: 0;
  transform: scale(.9);
  transition: opacity .18s ease, transform .18s ease, background .18s ease;
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
}
.card-del svg { width: 15px; height: 15px; }
body.is-admin .card-del { display: grid; }
.card:hover .card-del,
.card:focus-within .card-del { opacity: 1; transform: none; }
.card-del:hover { background: var(--danger); }

.card.removing { opacity: 0; scale: .92; pointer-events: none; }

/* ---------------- 状态区 ---------------- */

.grid-status {
  min-height: 26px;
  padding: 22px 0 6px;
  text-align: center;
  font-size: 13px;
  color: var(--text-faint);
}

.spinner-dot {
  display: inline-block;
  width: 15px;
  height: 15px;
  border: 2px solid var(--border-strong);
  border-top-color: var(--text-soft);
  border-radius: 50%;
  animation: spin .7s linear infinite;
  vertical-align: -3px;
  margin-right: 7px;
}
@keyframes spin { to { transform: rotate(360deg); } }

.sentinel { height: 1px; }

.empty-state {
  padding: 84px 20px 96px;
  text-align: center;
  color: var(--text-faint);
}
.empty-state svg { width: 58px; height: 58px; margin-bottom: 14px; opacity: .55; }
.empty-state h2 { margin: 0 0 6px; font-size: 17px; font-weight: 600; color: var(--text-soft); }
.empty-state p { margin: 0; font-size: 14px; }

.page-foot {
  max-width: 1760px;
  margin: 0 auto;
  padding: 30px 20px 44px;
  text-align: center;
  font-size: 12.5px;
  color: var(--text-faint);
}
.page-foot .dot { margin: 0 6px; }

/* ---------------- 弹窗 ---------------- */

.modal {
  position: fixed;
  inset: 0;
  z-index: 120;
  display: grid;
  place-items: center;
  padding: 20px;
}
.modal[hidden] { display: none; }

.modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(12, 13, 16, .48);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  animation: fade .2s ease;
}
@keyframes fade { from { opacity: 0; } }

.modal-panel {
  position: relative;
  width: 100%;
  max-height: calc(100vh - 40px);
  overflow-y: auto;
  padding: 26px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 18px;
  box-shadow: var(--shadow-lg);
  animation: pop .24s cubic-bezier(.2, .8, .3, 1);
}
@keyframes pop { from { opacity: 0; transform: translateY(14px) scale(.97); } }

.modal-xs { max-width: 380px; }
.modal-sm { max-width: 404px; }
.modal-md { max-width: 560px; }

.modal-close {
  position: absolute;
  top: 14px;
  right: 14px;
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  border: 0;
  border-radius: 8px;
  background: transparent;
  color: var(--text-faint);
  cursor: pointer;
}
.modal-close svg { width: 17px; height: 17px; }
.modal-close:hover { background: var(--accent-soft); color: var(--text); }

.modal-title { margin: 0 0 4px; font-size: 19px; font-weight: 650; letter-spacing: .2px; }
.modal-sub { margin: 0 0 20px; font-size: 13.5px; color: var(--text-faint); }

.modal-foot {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  margin-top: 20px;
}

/* ---------------- 表单 ---------------- */

.field { display: block; margin-bottom: 15px; }
.field-label {
  display: block;
  margin-bottom: 6px;
  font-size: 13px;
  font-weight: 550;
  color: var(--text-soft);
}
.field input {
  width: 100%;
  height: 42px;
  padding: 0 13px;
  border: 1px solid var(--border-strong);
  border-radius: 10px;
  background: var(--bg);
  transition: border-color .16s ease, box-shadow .16s ease;
}
.field input::placeholder { color: var(--text-faint); }
.field input:focus {
  outline: none;
  border-color: var(--focus);
  box-shadow: 0 0 0 3px rgba(75, 107, 251, .18);
}

.field-pass { position: relative; display: block; }
.field-pass input { padding-right: 42px; }
.pass-toggle {
  position: absolute;
  right: 5px;
  top: 5px;
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  border: 0;
  border-radius: 7px;
  background: transparent;
  color: var(--text-faint);
  cursor: pointer;
}
.pass-toggle svg { width: 17px; height: 17px; }
.pass-toggle:hover { color: var(--text); background: var(--accent-soft); }
.pass-toggle.on { color: var(--focus); }

.form-error {
  margin: 0 0 14px;
  padding: 9px 12px;
  border-radius: 9px;
  background: var(--danger-soft);
  color: var(--danger);
  font-size: 13px;
  animation: shake .3s ease;
}
@keyframes shake {
  25% { transform: translateX(-4px); }
  75% { transform: translateX(4px); }
}

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

.dropzone {
  padding: 30px 18px;
  border: 1.5px dashed var(--border-strong);
  border-radius: var(--radius);
  background: var(--bg);
  text-align: center;
  color: var(--text-faint);
  cursor: pointer;
  transition: border-color .18s ease, background .18s ease, color .18s ease;
}
.dropzone svg { width: 30px; height: 30px; margin-bottom: 8px; }
.dropzone p { margin: 0 0 3px; font-size: 14px; color: var(--text-soft); }
.dropzone b { color: var(--text); font-weight: 600; }
.dropzone small { font-size: 12px; }
.dropzone:hover, .dropzone.over {
  border-color: var(--focus);
  background: rgba(75, 107, 251, .07);
  color: var(--text-soft);
}

.file-list {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  max-height: 230px;
  overflow-y: auto;
  display: grid;
  gap: 7px;
}
.file-row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 7px 9px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--bg);
  font-size: 13px;
}
.file-thumb {
  width: 38px;
  height: 38px;
  flex: none;
  border-radius: 7px;
  object-fit: cover;
  background: var(--bg-sunken);
}
.file-thumb-video { background: #000; }
.file-meta { min-width: 0; flex: 1; }
.file-name { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.file-size { font-size: 11.5px; color: var(--text-faint); }
.file-row.bad .file-name { color: var(--danger); }
.file-row.bad .file-size { color: var(--danger); }
.file-drop {
  flex: none;
  width: 26px;
  height: 26px;
  display: grid;
  place-items: center;
  border: 0;
  border-radius: 7px;
  background: transparent;
  color: var(--text-faint);
  cursor: pointer;
}
.file-drop:hover { background: var(--danger-soft); color: var(--danger); }
.file-drop svg { width: 14px; height: 14px; }

.progress { display: flex; align-items: center; gap: 10px; margin-top: 16px; }
.progress-bar {
  flex: 1;
  height: 7px;
  border-radius: 999px;
  background: var(--bg-sunken);
  overflow: hidden;
}
.progress-bar i {
  display: block;
  height: 100%;
  width: 0;
  border-radius: inherit;
  background: var(--accent);
  transition: width .2s ease;
}
.progress-text {
  font-size: 12.5px;
  color: var(--text-faint);
  font-variant-numeric: tabular-nums;
  min-width: 34px;
  text-align: right;
}

/* ---------------- 灯箱 ---------------- */

.lightbox {
  position: fixed;
  inset: 0;
  z-index: 140;
  display: grid;
  place-items: center;
  animation: fade .22s ease;
}
.lightbox[hidden] { display: none; }

.lb-backdrop { position: absolute; inset: 0; background: rgba(8, 9, 11, .94); }

.lb-top {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  z-index: 3;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 12px 16px;
  color: #fff;
  background: linear-gradient(to bottom, rgba(0, 0, 0, .6), transparent);
}
.lb-meta { min-width: 0; display: flex; flex-direction: column; line-height: 1.35; }
.lb-name {
  font-size: 14px;
  font-weight: 550;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.lb-info { font-size: 12px; color: rgba(255, 255, 255, .62); }

.lb-tools { display: flex; align-items: center; gap: 4px; flex: none; }
.lb-counter {
  font-size: 12.5px;
  color: rgba(255, 255, 255, .62);
  font-variant-numeric: tabular-nums;
  margin-right: 6px;
}
.lb-btn { color: rgba(255, 255, 255, .8); }
.lb-btn:hover { background: rgba(255, 255, 255, .14); color: #fff; }
#lb-delete:hover { background: var(--danger); color: #fff; }

.lb-stage {
  position: relative;
  z-index: 2;
  margin: 0;
  width: 100%;
  height: 100%;
  display: grid;
  place-items: center;
  padding: 62px 74px;
}
.lb-stage img {
  max-width: 100%;
  max-height: 100%;
  width: auto;
  height: auto;
  object-fit: contain;
  border-radius: 6px;
  box-shadow: 0 24px 70px rgba(0, 0, 0, .6);
  opacity: 0;
  transition: opacity .25s ease;
}
.lb-stage img.ready { opacity: 1; }

.lb-stage video {
  max-width: 100%;
  max-height: 100%;
  width: auto;
  height: auto;
  object-fit: contain;
  border-radius: 6px;
  background: #000;
  box-shadow: 0 24px 70px rgba(0, 0, 0, .6);
}

.lb-spinner {
  position: absolute;
  width: 30px;
  height: 30px;
  border: 2.5px solid rgba(255, 255, 255, .22);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin .7s linear infinite;
}
.lb-spinner[hidden] { display: none; }

.lb-nav {
  position: absolute;
  z-index: 3;
  top: 50%;
  transform: translateY(-50%);
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  border: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, .1);
  color: #fff;
  cursor: pointer;
  transition: background .18s ease, opacity .18s ease;
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
}
.lb-nav:hover { background: rgba(255, 255, 255, .22); }
.lb-nav svg { width: 22px; height: 22px; }
.lb-prev { left: 16px; }
.lb-next { right: 16px; }
.lb-nav[disabled] { opacity: .22; cursor: default; }

/* ---------------- 轻提示 ---------------- */

.toast-wrap {
  position: fixed;
  z-index: 200;
  left: 50%;
  bottom: 26px;
  transform: translateX(-50%);
  display: grid;
  gap: 9px;
  justify-items: center;
  pointer-events: none;
}

.toast {
  display: flex;
  align-items: center;
  gap: 9px;
  max-width: min(90vw, 460px);
  padding: 10px 16px;
  border-radius: 999px;
  background: var(--accent);
  color: var(--accent-text);
  font-size: 13.5px;
  box-shadow: var(--shadow-lg);
  animation: toast-in .26s cubic-bezier(.2, .8, .3, 1);
}
.toast.out { animation: toast-out .22s ease forwards; }
.toast.err { background: var(--danger); color: #fff; }
.toast svg { width: 16px; height: 16px; flex: none; }

@keyframes toast-in  { from { opacity: 0; transform: translateY(14px); } }
@keyframes toast-out { to   { opacity: 0; transform: translateY(10px); } }

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

@media (max-width: 900px) {
  .brand-text small { display: none; }
  .photo-count { display: none; }
}

@media (max-width: 640px) {
  :root { --topbar-h: 58px; --radius: 12px; }

  .topbar-inner { padding: 0 12px; gap: 8px; }
  .brand-mark { width: 31px; height: 31px; border-radius: 9px; }
  .brand-text strong { font-size: 15px; }

  .page { padding: 14px 12px 4px; }

  .btn { height: 36px; padding: 0 12px; font-size: 13.5px; }
  #btn-upload span, #btn-login span { display: none; }
  #btn-upload, #btn-login { width: 36px; padding: 0; }
  .user-name { display: none; }
  .user-chip { padding: 0 7px 0 5px; }

  .modal { padding: 12px; align-items: flex-end; }
  .modal-panel { padding: 22px 18px; border-radius: 16px; max-height: calc(100vh - 24px); }
  .modal-sm, .modal-md, .modal-xs { max-width: 100%; }

  .lb-stage { padding: 58px 10px 74px; }
  .lb-nav { top: auto; bottom: 18px; transform: none; width: 42px; height: 42px; }
  .lb-prev { left: calc(50% - 52px); }
  .lb-next { right: calc(50% - 52px); }

  /* 移动端卡片信息条常驻，避免依赖 hover */
  .card-info { opacity: 1; transform: none; padding-top: 20px; }
  .card-del { opacity: 1; transform: none; }

  .toast-wrap { bottom: 18px; }
}

/* 尊重系统的减少动效偏好 */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
}

/* 打印时只留照片 */
@media print {
  .topbar, .page-foot, .modal, .lightbox, .toast-wrap, .grid-status { display: none !important; }
}