/* ===== CSS 变量 & 主题 ===== */
:root {
  --bg:          #f7f4ef;
  --bg2:         #eee8dd;
  --card:        #ffffff;
  --border:      #ddd5c8;
  --text:        #1e1e1e;
  --text2:       #666058;
  --accent:      #2d6a5f;
  --accent-h:    #245549;
  --danger:      #c0392b;
  --shadow:      0 2px 12px rgba(0,0,0,.08);
  --radius:      12px;
  --nav-w:       220px;
}
[data-theme="dark"] {
  --bg:          #1a1a1a;
  --bg2:         #222222;
  --card:        #2a2a2a;
  --border:      #3a3a3a;
  --text:        #e8e0d4;
  --text2:       #9a9080;
  --accent:      #4a9d8f;
  --accent-h:    #5bbdad;
  --danger:      #e05c4b;
  --shadow:      0 2px 12px rgba(0,0,0,.4);
}

/* ===== 重置 ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 15px; }
body {
  font-family: -apple-system, "Helvetica Neue", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  min-height: 100vh;
}
a { color: inherit; text-decoration: none; }
button { cursor: pointer; font: inherit; }
img { display: block; max-width: 100%; }

/* ===== 布局 ===== */
#app { display: flex; min-height: 100vh; }

.nav {
  width: var(--nav-w);
  flex-shrink: 0;
  background: var(--card);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  padding: 20px 0;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 20px 20px;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--accent);
  border-bottom: 1px solid var(--border);
  margin-bottom: 12px;
}
.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 20px;
  color: var(--text2);
  border-left: 3px solid transparent;
  transition: background .15s, color .15s;
}
.nav-item:hover  { background: var(--bg2); color: var(--text); }
.nav-item.active { background: var(--bg2); color: var(--accent); border-left-color: var(--accent); font-weight: 600; }
.nav-spacer { flex: 1; }
.nav-bottom { border-top: 1px solid var(--border); padding-top: 12px; }

.main { flex: 1; min-width: 0; display: flex; flex-direction: column; }
.topbar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 24px;
  height: 56px;
  background: var(--card);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
}
.topbar-title { font-size: 1rem; font-weight: 600; flex: 1; }
.content { padding: 24px; flex: 1; }

/* ===== 公共组件 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--text);
  font-size: .9rem;
  transition: background .15s, border-color .15s;
}
.btn:hover    { background: var(--bg2); }
.btn-primary  { background: var(--accent); color: #fff; border-color: var(--accent); }
.btn-primary:hover { background: var(--accent-h); border-color: var(--accent-h); }
.btn-danger   { color: var(--danger); border-color: var(--danger); }
.btn-danger:hover { background: var(--danger); color: #fff; }
.btn-icon     { padding: 6px; border-radius: 8px; border: none; background: transparent; color: var(--text2); }
.btn-icon:hover { background: var(--bg2); color: var(--text); }
.btn-sm       { padding: 5px 10px; font-size: .82rem; }

.input {
  width: 100%;
  padding: 9px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  color: var(--text);
  font: inherit;
  font-size: .9rem;
  transition: border-color .15s;
  outline: none;
}
.input:focus { border-color: var(--accent); }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

/* ===== 照片网格 ===== */
.photo-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 8px;
}
.photo-thumb {
  aspect-ratio: 1;
  background: var(--bg2);
  border-radius: 8px;
  overflow: hidden;
  cursor: pointer;
  position: relative;
}
.photo-thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform .2s; }
.photo-thumb:hover img { transform: scale(1.04); }
.photo-thumb .media-badge {
  position: absolute;
  right: 8px;
  bottom: 8px;
  padding: 4px 8px;
  border-radius: 999px;
  background: rgba(0,0,0,.72);
  color: #fff;
  font-size: .72rem;
  line-height: 1;
  z-index: 2;
}
.photo-thumb .check {
  position: absolute; top: 6px; left: 6px;
  width: 22px; height: 22px;
  border-radius: 50%;
  border: 2px solid rgba(255,255,255,.8);
  background: rgba(0,0,0,.3);
  opacity: 0;
  display: flex;
  align-items: center; justify-content: center;
  transition: opacity .15s;
  pointer-events: auto;   /* 可独立点击进入选择模式 */
  z-index: 2;
  cursor: pointer;
}
.photo-thumb:hover .check { opacity: 1; }
.photo-thumb.selected .check { opacity: 1; background: var(--accent); border-color: var(--accent); }
.photo-thumb.selected { outline: 3px solid var(--accent); outline-offset: -3px; }

.date-group { margin-bottom: 28px; }
.date-label {
  font-size: .82rem; font-weight: 600; color: var(--text2);
  margin-bottom: 8px;
  display: flex; align-items: center; gap: 8px;
}
.date-label .date-text { flex: 1; }
.date-select-all {
  display: none;
  padding: 4px 8px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--text2);
  font-size: .74rem;
}
body.selection-mode .date-select-all { display: inline-flex; }

/* 加载 */
.load-more { text-align: center; padding: 24px 0; color: var(--text2); font-size: .88rem; }
.spinner {
  width: 24px; height: 24px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin .7s linear infinite;
  margin: 0 auto 8px;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ===== 相册卡片 ===== */
.album-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 16px;
}
.album-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  cursor: pointer;
  transition: box-shadow .2s, transform .2s;
}
.album-card:hover { box-shadow: var(--shadow); transform: translateY(-2px); }
.album-cover { aspect-ratio: 1; background: var(--bg2); overflow: hidden; }
.album-cover img { width: 100%; height: 100%; object-fit: cover; }
.album-cover-empty { width: 100%; height: 100%; display: flex; align-items: center; justify-content: center; color: var(--text2); }
.album-info { padding: 10px 12px; }
.album-name { font-weight: 600; font-size: .9rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.album-count { font-size: .78rem; color: var(--text2); margin-top: 2px; }

/* ===== 灯箱 ===== */
.lightbox { position: fixed; inset: 0; background: rgba(0,0,0,.92); z-index: 1000; display: none; flex-direction: column; }
.lightbox.open { display: flex; }
.lightbox-header { display: flex; align-items: center; gap: 8px; padding: 12px 16px; color: #ccc; }
.lightbox-header .lb-title { flex: 1; font-size: .9rem; }
.lightbox-body { flex: 1; display: flex; align-items: center; justify-content: center; position: relative; min-height: 0; }
.lightbox-img { max-width: 100%; max-height: 100%; object-fit: contain; border-radius: 4px; user-select: none; }
.lightbox-video { max-width: 100%; max-height: 100%; border-radius: 4px; background: #000; }
.hidden { display: none !important; }
.lb-nav {
  position: absolute; top: 50%; transform: translateY(-50%);
  width: 44px; height: 44px; border-radius: 50%;
  background: rgba(255,255,255,.12); border: none; color: #fff;
  display: flex; align-items: center; justify-content: center;
  transition: background .15s;
}
.lb-nav:hover { background: rgba(255,255,255,.25); }
.lb-prev { left: 16px; }
.lb-next { right: 16px; }
.lb-nav.hidden { opacity: 0; pointer-events: none; }
.lightbox-info {
  padding: 12px 20px;
  background: rgba(0,0,0,.6);
  color: #ccc; font-size: .82rem;
  display: flex; flex-wrap: wrap; gap: 16px;
}
.lb-info-item { display: flex; flex-direction: column; gap: 2px; }
.lb-info-item span:first-child { font-size: .7rem; color: #888; text-transform: uppercase; letter-spacing: .5px; }

/* ===== 上传 ===== */
.upload-zone {
  position: relative;
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 36px 20px;
  text-align: center; color: var(--text2);
  transition: border-color .2s, background .2s;
  cursor: pointer;
}
.upload-zone input[type="file"] {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}
.upload-zone.drag-over { border-color: var(--accent); background: rgba(45,106,95,.06); }
.upload-queue {
  margin-top: 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-height: 40vh;
  overflow-y: auto;
  padding-right: 4px;
  scrollbar-color: var(--border) transparent;
}
.upload-queue::-webkit-scrollbar {
  width: 10px;
}
.upload-queue::-webkit-scrollbar-track {
  background: transparent;
}
.upload-queue::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 999px;
  border: 2px solid transparent;
  background-clip: padding-box;
}
.upload-queue::-webkit-scrollbar-thumb:hover {
  background: var(--text2);
  background-clip: padding-box;
}
.upload-item {
  display: flex; align-items: center; gap: 10px;
  padding: 8px 12px; background: var(--bg2); border-radius: 8px; font-size: .85rem;
}
.upload-item .up-name { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.upload-item .btn { flex-shrink: 0; }
.progress-bar { width: 100%; height: 4px; background: var(--border); border-radius: 2px; overflow: hidden; }
.progress-fill { height: 100%; background: var(--accent); transition: width .2s; }
.up-status { font-size: .75rem; white-space: nowrap; }
.up-status.done  { color: var(--accent); }
.up-status.error { color: var(--danger); }

/* ===== 登录页 ===== */
.login-wrap { min-height: 100vh; display: flex; align-items: center; justify-content: center; background: var(--bg); }
.login-card { width: 360px; padding: 36px 32px; background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); }
.login-logo { text-align: center; margin-bottom: 28px; color: var(--accent); font-size: 1.3rem; font-weight: 700; display: flex; align-items: center; justify-content: center; gap: 8px; }
.form-group { margin-bottom: 16px; }
.form-label { display: block; font-size: .83rem; font-weight: 600; color: var(--text2); margin-bottom: 5px; }
.login-error { color: var(--danger); font-size: .84rem; margin-top: 8px; min-height: 1.2em; }

/* ===== 模态框 ===== */
.modal-overlay { position: fixed; inset: 0; background: rgba(0,0,0,.5); z-index: 1100; display: none; align-items: center; justify-content: center; }
.modal-overlay.open { display: flex; }
.modal { background: var(--card); border-radius: var(--radius); box-shadow: 0 8px 32px rgba(0,0,0,.2); padding: 28px 28px 20px; width: 420px; max-width: 95vw; }
.modal-title { font-size: 1rem; font-weight: 700; margin-bottom: 16px; }
.modal-footer { display: flex; gap: 8px; justify-content: flex-end; margin-top: 20px; }

/* ===== Toast ===== */
.toast-stack {
  position: fixed;
  right: 16px;
  bottom: 16px;
  z-index: 1400;
  display: flex;
  flex-direction: column;
  gap: 10px;
  pointer-events: none;
}
.toast {
  min-width: 220px;
  max-width: 360px;
  padding: 10px 14px;
  border-radius: 10px;
  background: rgba(30, 30, 30, .92);
  color: #fff;
  box-shadow: 0 8px 24px rgba(0,0,0,.22);
  font-size: .85rem;
  line-height: 1.4;
  opacity: 0;
  transform: translateY(8px);
  transition: opacity .18s ease, transform .18s ease;
}
.toast.show {
  opacity: 1;
  transform: translateY(0);
}

/* ===== 工具栏 ===== */
.toolbar { display: flex; align-items: center; gap: 8px; margin-bottom: 16px; flex-wrap: wrap; }
.toolbar-spacer { flex: 1; }
.selected-bar { display: none; align-items: center; gap: 8px; padding: 8px 16px; background: var(--accent); color: #fff; border-radius: 8px; font-size: .88rem; }
.selected-bar.visible { display: flex; }
.selected-count { font-weight: 600; }

/* ===== 分享页 ===== */
.share-wrap { min-height: 100vh; display: flex; flex-direction: column; align-items: center; padding: 40px 16px; background: var(--bg); }
.share-header { text-align: center; margin-bottom: 24px; color: var(--text2); font-size: .9rem; }
.share-header strong { display: block; font-size: 1.3rem; color: var(--text); margin-bottom: 4px; }

/* ===== 空状态 ===== */
.empty { text-align: center; padding: 64px 20px; color: var(--text2); }
.empty svg { margin: 0 auto 16px; opacity: .3; }
.empty p { font-size: .9rem; margin-top: 8px; }

/* ===== 分享图标徽章 ===== */
.photo-thumb .share-badge {
  position: absolute; bottom: 6px; right: 6px;
  width: 20px; height: 20px;
  border-radius: 50%;
  background: rgba(45,106,95,.85);
  display: flex; align-items: center; justify-content: center;
  pointer-events: none;
}
.photo-thumb .share-badge svg { width: 11px; height: 11px; stroke: #fff; }

/* ===== 相册选择弹窗 ===== */
.album-picker-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  gap: 10px;
  max-height: 320px;
  overflow-y: auto;
  margin-top: 8px;
}
.album-picker-item {
  border: 2px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  cursor: pointer;
  transition: border-color .15s, transform .15s;
}
.album-picker-item:hover  { border-color: var(--accent); transform: translateY(-2px); }
.album-picker-item.picked { border-color: var(--accent); background: rgba(45,106,95,.08); }
.album-picker-cover {
  aspect-ratio: 1;
  background: var(--bg2);
  display: flex; align-items: center; justify-content: center;
  color: var(--text2);
  font-size: .7rem;
}
.album-picker-cover img { width: 100%; height: 100%; object-fit: cover; }
.album-picker-name {
  padding: 4px 6px;
  font-size: .78rem;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* ===== 汉堡按钮（移动端） ===== */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  background: none;
  border: none;
  cursor: pointer;
}
.hamburger span {
  display: block;
  width: 22px; height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform .2s, opacity .2s;
}

/* ===== 抽屉遮罩 ===== */
.drawer-overlay {
  display: none;
  position: fixed; inset: 0;
  background: rgba(0,0,0,.4);
  z-index: 900;
}
.drawer-overlay.open { display: block; }

/* ===== 响应式 ===== */
@media (max-width: 640px) {
  .nav {
    position: fixed; top: 0; left: 0;
    height: 100vh; z-index: 950;
    transform: translateX(-100%);
    transition: transform .25s ease;
    box-shadow: 4px 0 16px rgba(0,0,0,.15);
  }
  .nav.open { transform: translateX(0); }
  .hamburger { display: flex; }
  .photo-grid { grid-template-columns: repeat(auto-fill, minmax(100px, 1fr)); gap: 3px; }
  .album-grid  { grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); }
  .content { padding: 10px; }
  .topbar { padding: 0 12px; }
}