:root {
  --bg: #0f1117;
  --pane: #161923;
  --pane-2: #1c2030;
  --line: #262b3a;
  --text: #e6e8ef;
  --muted: #8b93a7;
  --accent: #5b8cff;
  --accent-soft: rgba(91, 140, 255, .14);
  --danger: #ff6b6b;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f4f5f8;
    --pane: #ffffff;
    --pane-2: #f7f8fb;
    --line: #e2e5ec;
    --text: #1a1d26;
    --muted: #6b7385;
    --accent: #3d6fe0;
    --accent-soft: rgba(61, 111, 224, .10);
  }
}

* { box-sizing: border-box; }

/* ⚠ 必須放在所有規則之前且帶 !important。
   [hidden] 靠瀏覽器預設樣式的 display:none 生效，任何作者端的
   display 宣告（如 .empty{display:flex}）都會蓋掉它 —— 元素會變成
   看不見卻仍攔截點擊與滾動的透明遮罩。這正是先前檢視區「捲不動、
   點不到」的原因。 */
[hidden] { display: none !important; }

html, body { height: 100%; margin: 0; }

body {
  background: var(--bg);
  color: var(--text);
  font: 14px/1.5 "Segoe UI", "Microsoft JhengHei", system-ui, sans-serif;
  overflow: hidden;
}

.screen { display: none; height: 100%; flex-direction: column; }
.screen.active { display: flex; }

/* ── 通用元件 ─────────────────────────────────── */
.btn {
  padding: 6px 12px;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: var(--pane);
  color: var(--text);
  font-size: 13px;
  cursor: pointer;
}

.btn:hover:not(:disabled) { border-color: var(--accent); color: var(--accent); }
.btn:disabled { opacity: .4; cursor: default; }
.btn.ghost { background: transparent; }

.btn.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  padding: 9px;
  font-size: 14px;
}

.btn.primary:hover { opacity: .9; color: #fff; }

.linkbtn {
  background: none; border: none; color: var(--accent);
  cursor: pointer; font-size: inherit; padding: 0; text-decoration: underline;
}

/* ── 畫面一：選單 ─────────────────────────────── */
#screen-home { align-items: center; justify-content: center; }

.home { text-align: center; padding: 24px; }
.home-logo { width: 88px; height: 88px; display: block; margin: 0 auto 14px; }
.home-title { font-size: 30px; margin: 0 0 6px; letter-spacing: 1px; }
.home-sub { color: var(--muted); margin: 0 0 36px; }

.login-logo { width: 56px; height: 56px; align-self: center; margin-bottom: 2px; }

.home-cards { display: flex; gap: 20px; flex-wrap: wrap; justify-content: center; }

.home-card {
  width: 230px;
  padding: 30px 22px;
  display: flex; flex-direction: column; align-items: center; gap: 10px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--pane);
  color: var(--text);
  cursor: pointer;
  transition: border-color .15s, transform .15s, background .15s;
  font: inherit;
}

.home-card:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
  transform: translateY(-3px);
}

/* 未登入時的登入牆：取代卡片區，不透露任何報告資訊 */
.home-guest {
  display: flex; flex-direction: column; align-items: center; gap: 16px;
  padding: 30px 22px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--pane);
  max-width: 360px;
  margin: 0 auto;
}

.home-guest-msg { margin: 0; font-size: 14px; color: var(--muted); line-height: 1.7; }
.home-guest .btn.primary { padding: 9px 28px; }

.home-who {
  margin: 28px 0 0;
  font-size: 12px; color: var(--muted);
  display: flex; gap: 10px; align-items: center; justify-content: center;
}

.hc-icon { font-size: 40px; line-height: 1; }
.hc-name { font-size: 17px; font-weight: 600; }
.hc-desc { font-size: 12px; color: var(--muted); line-height: 1.7; }
.hc-desc em { font-style: normal; color: var(--accent); }

/* ── 標題列 ───────────────────────────────────── */
.bar {
  display: flex; align-items: center; gap: 12px;
  padding: 10px 16px;
  border-bottom: 1px solid var(--line);
  background: var(--pane-2);
  flex: 0 0 auto;
}

.bar-title {
  font-size: 14px; margin: 0; font-weight: 600; flex: 1 1 auto;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}

.bar-right { display: flex; align-items: center; gap: 8px; flex: 0 0 auto; }
.who { color: var(--muted); font-size: 12px; }
.count { color: var(--muted); font-size: 12px; flex: 0 0 auto; }

/* ── 畫面二：上傳 ─────────────────────────────── */
.center-box { flex: 1 1 auto; display: flex; align-items: center; justify-content: center; }

.card-form {
  width: 300px; padding: 28px 30px;
  background: var(--pane); border: 1px solid var(--line); border-radius: 12px;
  display: flex; flex-direction: column; gap: 14px;
}

.card-form h3 { margin: 0 0 4px; font-size: 15px; }
.card-form label { display: flex; flex-direction: column; gap: 5px; font-size: 12px; color: var(--muted); }

.card-form input {
  padding: 9px 11px; border: 1px solid var(--line); border-radius: 7px;
  background: var(--pane-2); color: var(--text); font-size: 14px;
}

.card-form input:focus { outline: none; border-color: var(--accent); }
.form-err { color: var(--danger); font-size: 12px; min-height: 16px; margin: 0; }

.upload-box { flex: 1 1 auto; display: flex; flex-direction: column; min-height: 0; padding: 20px; gap: 18px; }

/* ── 分類：上傳端 ─────────────────────────────── */
.cat-row {
  display: flex; align-items: center; gap: 10px; flex-wrap: wrap;
  flex: 0 0 auto;
}

.cat-row > label { font-size: 13px; color: var(--muted); }

.cat-select {
  min-width: 180px;
  padding: 7px 10px;
  border: 1px solid var(--line); border-radius: 7px;
  background: var(--pane-2); color: var(--text); font-size: 14px;
}

.cat-select:focus { outline: none; border-color: var(--accent); }
.cat-hint { font-size: 12px; color: var(--muted); }

/* ── 分類：檢視端篩選 ─────────────────────────── */
.cat-filter {
  display: flex; flex-wrap: wrap; gap: 6px;
  padding: 4px 16px 2px; flex: 0 0 auto;
}

.chip {
  padding: 3px 11px;
  border: 1px solid var(--line); border-radius: 999px;
  background: transparent; color: var(--muted);
  font-size: 12px; cursor: pointer;
}

.chip:hover { border-color: var(--accent); color: var(--accent); }

.chip.active {
  background: var(--accent); border-color: var(--accent); color: #fff;
}

.card .cat {
  font-size: 10px; padding: 2px 6px; border-radius: 4px;
  background: var(--line); color: var(--muted); flex: 0 0 auto;
}

/* ── 檢視導覽：擁有者 → 群組 → 小分類 ──────────── */
.owner-nav, .group-nav, .sub-nav {
  display: flex; flex-wrap: wrap; align-items: center; gap: 6px;
  padding: 3px 16px; flex: 0 0 auto;
}
.owner-nav { padding-top: 8px; }
.owner-nav .chip { font-weight: 600; }
.group-nav { padding-bottom: 3px; }
.sub-nav { padding-bottom: 8px; border-bottom: 1px solid var(--line); }
.owner-nav:empty, .group-nav:empty, .sub-nav:empty { display: none; }
.chip.sub { font-size: 11px; padding: 2px 9px; }

/* 導覽層級的前綴標籤 */
.nav-label {
  font-size: 11px; color: var(--muted);
  min-width: 42px; margin-right: 2px; user-select: none;
}

.sort-select {
  padding: 5px 8px; border: 1px solid var(--line); border-radius: 7px;
  background: var(--pane-2); color: var(--text); font-size: 12px;
}
.sort-select:focus { outline: none; border-color: var(--accent); }

/* ── 管理畫面 ─────────────────────────────────── */
.manage-body {
  flex: 1 1 auto; overflow-y: auto;
  width: 100%; max-width: 780px; margin: 0 auto;
  padding: 24px 24px 48px;
  display: flex; flex-direction: column; gap: 16px;
}

.manage-section {
  background: var(--pane); border: 1px solid var(--line);
  border-radius: 12px; padding: 18px 20px;
}
.manage-section h4 {
  margin: 0 0 14px; font-size: 14px; font-weight: 600; color: var(--text);
  display: flex; align-items: center; gap: 8px;
}
.manage-section h4::before {
  content: ""; width: 3px; height: 15px; border-radius: 2px; background: var(--accent);
}

/* 分段控制 */
.mode-tabs {
  display: inline-flex; margin-bottom: 14px;
  border: 1px solid var(--line); border-radius: 8px; overflow: hidden;
}
.mode-tabs .btn {
  border: none; border-radius: 0; border-right: 1px solid var(--line);
  padding: 7px 16px;
}
.mode-tabs .btn:last-child { border-right: none; }
.mode-tabs .btn:hover:not(.active) { color: var(--accent); }
.mode-tabs .btn.active { background: var(--accent); color: #fff; }

/* 依擁有者：方格 */
.owner-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
  gap: 10px; margin-bottom: 6px;
}
.owner-grid:empty { display: none; }
.owner-box {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 4px; padding: 18px 10px; cursor: pointer;
  border: 1px solid var(--line); border-radius: 10px;
  background: var(--pane-2); color: var(--text); font: inherit;
  transition: border-color .12s, background .12s;
}
.owner-box:hover { border-color: var(--accent); }
.owner-box.active { border-color: var(--accent); background: var(--accent-soft); }
.ob-name { font-size: 15px; font-weight: 600; }
.ob-sub { font-size: 11px; color: var(--muted); }

/* 群組清單列 */
.browse-groups { display: flex; flex-direction: column; gap: 8px; }
.browse-row {
  display: grid; grid-template-columns: 1fr auto; row-gap: 4px; column-gap: 10px;
  align-items: center; padding: 10px 12px;
  border: 1px solid var(--line); border-radius: 9px;
  background: var(--pane-2); cursor: pointer;
  transition: border-color .12s, background .12s;
}
.browse-row:hover { border-color: var(--accent); }
.browse-row.flash { border-color: var(--accent); background: var(--accent-soft); }
.br-name { font-weight: 600; font-size: 14px; }
.br-count {
  font-size: 11px; color: var(--muted); justify-self: end;
  border: 1px solid var(--line); border-radius: 999px; padding: 1px 9px;
}
.br-users { font-size: 12px; color: var(--muted); grid-column: 1 / -1; }

/* 表單列 */
.inline-form { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.inline-form input, .inline-form select {
  padding: 8px 10px; border: 1px solid var(--line); border-radius: 7px;
  background: var(--pane-2); color: var(--text); font-size: 13px;
  min-width: 120px; height: 36px;
}
.inline-form input:focus, .inline-form select:focus { outline: none; border-color: var(--accent); }
.inline-form .btn { height: 36px; }
.mg-hint { font-size: 12px; color: var(--muted); margin: 10px 0 0; }

/* 對話框標題列（可見性 modal 用）*/
.modal-head {
  display: flex; align-items: center; justify-content: space-between; margin-bottom: 4px;
}
.modal-head h3 { margin: 0; }

/* ── 可見性清單 ───────────────────────────────── */
.vis-list { display: flex; flex-direction: column; gap: 6px; margin: 8px 0; max-height: 50vh; overflow-y: auto; }
.vis-row { display: flex; align-items: center; gap: 6px; font-size: 14px; cursor: pointer; }

.dropzone {
  border: 2px dashed var(--line);
  border-radius: 12px;
  padding: 44px 20px;
  text-align: center;
  transition: border-color .15s, background .15s;
  flex: 0 0 auto;
}

.dropzone.dragover { border-color: var(--accent); background: var(--accent-soft); }
.dropzone.busy { opacity: .6; pointer-events: none; }

.dz-icon { font-size: 30px; color: var(--accent); }
.dz-title { margin: 8px 0 3px; font-size: 15px; }
.dz-sub { margin: 0; font-size: 12px; color: var(--muted); }

.progress {
  margin: 16px auto 0; width: 60%; height: 4px;
  background: var(--line); border-radius: 2px; overflow: hidden;
}

.progress .bar-fill {
  height: 100%; width: 40%; background: var(--accent);
  animation: slide 1.1s ease-in-out infinite;
}

@keyframes slide {
  0% { margin-left: -40%; }
  100% { margin-left: 100%; }
}

.recent { flex: 1 1 auto; min-height: 0; display: flex; flex-direction: column; }
.recent h4 { margin: 0 0 8px; font-size: 12px; color: var(--muted); font-weight: 600; }
.recent-list {
  overflow-y: auto; display: grid; gap: 10px; align-content: flex-start;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
}

/* ── 畫面三：檢視 ─────────────────────────────── */
.view-screen { display: none; }
.view-screen.active { display: flex; }

.list-pane {
  flex: 0 0 auto; height: 34%;
  display: flex; flex-direction: column;
  background: var(--pane); min-height: 0; overflow: hidden;
}

.list-pane.collapsed { height: auto !important; }
.list-pane.collapsed .report-list { display: none; }

.list-head {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 16px 6px; flex: 0 0 auto;
}

.search {
  flex: 1 1 auto; max-width: 280px;
  padding: 6px 10px; border: 1px solid var(--line); border-radius: 7px;
  background: var(--pane-2); color: var(--text); font-size: 13px;
}

.search:focus { outline: none; border-color: var(--accent); }

.report-list {
  flex: 1 1 auto; min-height: 0; overflow-y: auto;
  display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  align-content: flex-start; gap: 10px;
  padding: 10px 16px 16px;
}

.card {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 12px; min-width: 0;
  border: 1px solid var(--line); border-radius: 10px;
  background: var(--pane-2); cursor: pointer;
  transition: border-color .12s, background .12s, box-shadow .12s;
}

.card:hover { border-color: var(--accent); box-shadow: 0 2px 10px rgba(0,0,0,.18); }
.card.active { border-color: var(--accent); background: var(--accent-soft); }

.card .kind {
  font-size: 10px; font-weight: 700; letter-spacing: .5px;
  padding: 3px 6px; border-radius: 5px; flex: 0 0 auto;
  background: var(--accent-soft); color: var(--accent);
}
.card .kind.pdf { background: rgba(255,107,107,.16); color: var(--danger); }

.card-main { flex: 1 1 auto; min-width: 0; display: flex; flex-direction: column; gap: 2px; }
.card .name {
  font-size: 13px; font-weight: 500;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.card-meta {
  font-size: 11px; color: var(--muted);
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}

.card-acts {
  display: flex; gap: 2px; flex: 0 0 auto;
  opacity: 0; transition: opacity .12s;
}
.card:hover .card-acts, .card.active .card-acts { opacity: 1; }

.card .act {
  border: none; background: none; color: var(--muted);
  cursor: pointer; padding: 2px 3px; font-size: 13px; border-radius: 5px;
}
.card .act:hover { color: var(--accent); background: var(--accent-soft); }
.card .act.del:hover { color: var(--danger); background: rgba(255,107,107,.14); }

.list-empty { color: var(--muted); font-size: 12px; padding: 4px 2px; }

.splitter { flex: 0 0 6px; background: var(--bg); cursor: row-resize; position: relative; }
.splitter::after {
  content: ""; position: absolute; inset: 2px 45%;
  border-radius: 2px; background: var(--line);
}
.splitter:hover::after { background: var(--accent); }
.list-pane.collapsed + .splitter { display: none; }

.viewer { flex: 1 1 auto; min-height: 0; position: relative; background: var(--bg); }

#frame { width: 100%; height: 100%; border: none; background: #fff; display: block; }

/* 拖曳分隔線時 iframe 會吃掉 mousemove */
body.resizing #frame { pointer-events: none; }

.empty {
  position: absolute; inset: 0;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 4px; color: var(--muted);
  pointer-events: none;   /* 雙保險：即使又被顯示出來也不擋操作 */
}

.empty p { margin: 0; }
.empty-sub { font-size: 12px; opacity: .8; }

/* ── 登入對話框 ───────────────────────────────── */
.modal {
  position: fixed; inset: 0; z-index: 60;
  display: flex; align-items: center; justify-content: center;
  background: rgba(0, 0, 0, .55);
}

.modal .card-form { width: 320px; }
.modal-actions { display: flex; gap: 8px; justify-content: flex-end; }
.modal-actions .btn { flex: 0 0 auto; }
.modal-actions .btn.primary { padding: 8px 18px; }

.hint-text { margin: 0; font-size: 13px; color: var(--muted); }

/* 未登入時，清單下方的說明 */
.manage-hint {
  padding: 6px 16px 10px;
  font-size: 12px; color: var(--muted);
  flex: 0 0 auto;
}

.manage-hint button {
  background: none; border: none; color: var(--accent);
  cursor: pointer; font-size: inherit; padding: 0; text-decoration: underline;
}

/* ── Toast ────────────────────────────────────── */
.toast {
  position: fixed; left: 50%; bottom: 24px; transform: translateX(-50%);
  padding: 9px 16px; border-radius: 8px;
  background: var(--pane-2); border: 1px solid var(--line); color: var(--text);
  font-size: 13px; box-shadow: 0 6px 24px rgba(0, 0, 0, .3);
  z-index: 50; max-width: 80vw;
}

.toast.err { border-color: var(--danger); color: var(--danger); }