:root {
  --bg: #EEF1F5;
  --surface: #FFFFFF;
  --ink: #1E2A38;
  --ink-soft: #5B6B7C;
  --line: #DCE2E9;
  --brass: #B8863B;
  --brass-dark: #93692A;
  --danger: #B4432F;
  --room-col-w: 170px; /* 週曆左側「教室」欄寬度，可由使用者拖曳調整（見 .col-resize-handle） */
  --font-scale: 1; /* 全站字體大小倍率，可由使用者手動調整（見右上角 A- / A+ 按鈕） */
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; height: 100%; }
body {
  font-family: 'IBM Plex Sans TC', 'IBM Plex Sans', sans-serif;
  background: var(--bg);
  color: var(--ink);
  font-size: calc(14px * var(--font-scale));
  overflow: hidden;
}
button, input, select, textarea { font-family: inherit; }
.app { display: flex; height: 100vh; height: 100dvh; }

/* sidebar */
.sidebar {
  width: 240px; flex-shrink: 0; background: var(--surface);
  border-right: 1px solid var(--line); padding: 20px 14px; height: 100vh; height: 100dvh;
  padding-top: max(20px, env(safe-area-inset-top));
  padding-bottom: max(20px, env(safe-area-inset-bottom));
  padding-left: max(14px, env(safe-area-inset-left));
  display: flex; flex-direction: column; overflow: hidden;
}
.brand { font-weight: 700; font-size: calc(16px * var(--font-scale)); margin-bottom: 18px; display: flex; align-items: baseline; gap: 6px; flex-shrink: 0; }
.brand-title { color: var(--brass-dark); }
.brand-sub { font-weight: 500; font-size: calc(12.5px * var(--font-scale)); color: var(--ink); }
.sidebar-filters { display: flex; flex-direction: column; gap: 6px; margin-bottom: 12px; flex-shrink: 0; }
.side-input { border: 1px solid var(--line); border-radius: 6px; padding: 6px 8px; font-size: calc(12.5px * var(--font-scale)); background: #fff; color: var(--ink); width: 100%; }
.side-input:focus { outline: 2px solid var(--brass); border-color: var(--brass); }
.room-list-scroll { flex: 1; overflow-y: auto; -webkit-overflow-scrolling: touch; min-height: 0; padding-right: 2px; }
.room-count { font-size: calc(11px * var(--font-scale)); color: var(--ink-soft); padding: 2px 4px 8px; }
.cat-dot { width: 8px; height: 8px; border-radius: 2px; flex-shrink: 0; display: inline-block; }
.room-row {
  width: 100%; display: flex; align-items: center; gap: 8px; padding: 6px 10px 6px 28px;
  border-radius: 6px; cursor: pointer; font-size: calc(13px * var(--font-scale)); color: var(--ink);
}
.room-row:hover { background: var(--bg); }
.room-row.checked { background: #FBF3E3; }
.room-row input[type="checkbox"] { flex-shrink: 0; width: 15px; height: 15px; accent-color: var(--brass); cursor: pointer; }
.room-row-text { flex: 1; min-width: 0; overflow: hidden; }
.room-row-text span { display: block; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.room-cap { font-family: 'IBM Plex Mono', monospace; font-size: calc(11px * var(--font-scale)); color: var(--ink-soft); white-space: nowrap; }
.side-btn-row { display: flex; gap: 6px; }
.side-btn { flex: 1; padding: 6px 0; font-size: calc(12px * var(--font-scale)); }
.room-loc { display: block; font-size: calc(10.5px * var(--font-scale)); color: var(--ink-soft); }
.month-loc-select { width: 160px; }

/* collapsible location groups (sidebar + week view share this look) */
.loc-group-header {
  display: flex; align-items: center; gap: 7px; padding: 7px 10px; margin-top: 4px;
  cursor: pointer; user-select: none; border-radius: 6px; background: #F3F0E9;
}
.loc-group-header:hover { background: #EEE8DA; }
.loc-group-header input[type="checkbox"] { width: 14px; height: 14px; accent-color: var(--brass); cursor: pointer; flex-shrink: 0; }
.loc-group-arrow { display: inline-block; font-size: calc(10px * var(--font-scale)); color: var(--brass-dark); transition: transform 0.15s; flex-shrink: 0; }
.loc-group-arrow.collapsed { transform: rotate(-90deg); }
.loc-group-name { font-size: calc(12.5px * var(--font-scale)); font-weight: 700; color: var(--ink); flex: 1; min-width: 0; overflow: hidden; white-space: nowrap; text-overflow: ellipsis; }
.loc-group-count { font-family: 'IBM Plex Mono', monospace; font-size: calc(11px * var(--font-scale)); color: var(--ink-soft); flex-shrink: 0; }

/* login overlay */
.login-overlay {
  position: fixed; inset: 0; background: var(--bg); display: flex; align-items: center; justify-content: center; z-index: 100;
  padding: max(20px, env(safe-area-inset-top)) max(20px, env(safe-area-inset-right)) max(20px, env(safe-area-inset-bottom)) max(20px, env(safe-area-inset-left));
}
.login-box {
  background: var(--surface); border: 1px solid var(--line); border-radius: 12px; padding: 32px 30px;
  width: 100%; max-width: 360px; box-shadow: 0 20px 60px rgba(0,0,0,0.12);
}
.login-box .brand { margin-bottom: 10px; }
.login-box p.muted { font-size: calc(12.5px * var(--font-scale)); line-height: 1.6; margin: 0 0 16px; }
.login-box input { width: 100%; margin-bottom: 4px; }
.admin-link {
  padding: 9px 10px; border-radius: 7px; border: 1px solid var(--line);
  background: var(--surface); cursor: pointer; font-size: calc(13px * var(--font-scale)); color: var(--ink-soft);
}
.admin-link:hover { border-color: var(--brass); color: var(--brass-dark); }
.admin-link.active { background: var(--ink); color: #fff; border-color: var(--ink); }
.sidebar-footer { margin-top: auto; display: flex; flex-direction: column; gap: 8px; padding-top: 12px; flex-shrink: 0; }
.font-size-row { display: flex; align-items: center; gap: 6px; }
.font-size-label { font-size: calc(11.5px * var(--font-scale)); color: var(--ink-soft); flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.font-size-btn {
  width: 26px; height: 26px; flex-shrink: 0; border-radius: 6px; border: 1px solid var(--line);
  background: var(--surface); cursor: pointer; font-size: calc(11px * var(--font-scale)); color: var(--ink-soft); font-weight: 700;
  display: flex; align-items: center; justify-content: center; padding: 0;
}
.font-size-btn:hover { border-color: var(--brass); color: var(--brass-dark); }

/* main */
.main {
  --pad-l: max(28px, env(safe-area-inset-left)); --pad-r: max(28px, env(safe-area-inset-right));
  flex: 1; min-width: 0; height: 100vh; height: 100dvh; overflow-y: auto; -webkit-overflow-scrolling: touch; overflow-x: hidden;
  padding: 0 var(--pad-r) 20px var(--pad-l);
}
/* 週曆「依教室」顯示時鎖住外層捲動，改由 .roomgrid-wrap 自己的捲軸處理（見 app.js
   renderCalendar 的說明）；避免外層 + 內層同時可以垂直捲動，導致 iOS Safari 上
   position:sticky 的地點/日期列跟著亂掉。 */
.main.lock-scroll { overflow-y: hidden; }
.topbar {
  display: flex; align-items: center; justify-content: space-between; margin-bottom: 18px; flex-wrap: wrap; gap: 12px;
  position: sticky; top: 0; z-index: 10; background: var(--bg);
  padding: max(20px, calc(env(safe-area-inset-top) + 8px)) 0 12px;
}
.topbar-left { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.nav-btn {
  width: 30px; height: 30px; border-radius: 6px; border: 1px solid var(--line); background: var(--surface);
  display: flex; align-items: center; justify-content: center; cursor: pointer; color: var(--ink); font-size: calc(16px * var(--font-scale));
}
.nav-btn:hover { border-color: var(--brass); color: var(--brass-dark); }
.header-label { font-size: calc(19px * var(--font-scale)); font-weight: 700; min-width: 150px; }
.today-btn, .btn-ghost {
  padding: 6px 12px; border-radius: 6px; border: 1px solid var(--line); background: var(--surface);
  font-size: calc(12.5px * var(--font-scale)); cursor: pointer; color: var(--ink-soft);
}
.today-btn:hover, .btn-ghost:hover { border-color: var(--brass); color: var(--brass-dark); }
.view-toggle { display: flex; border: 1px solid var(--line); border-radius: 7px; overflow: hidden; }
.view-toggle button { padding: 6px 14px; border: none; background: var(--surface); cursor: pointer; font-size: calc(13px * var(--font-scale)); color: var(--ink-soft); }
.view-toggle button.active { background: var(--ink); color: #fff; }
.new-btn {
  padding: 8px 16px; border-radius: 7px; border: none; background: var(--brass); color: #fff;
  font-weight: 600; font-size: calc(13px * var(--font-scale)); cursor: pointer;
}
.new-btn:hover { background: var(--brass-dark); }
.muted { color: var(--ink-soft); }
.err-text { color: var(--danger); font-size: calc(13px * var(--font-scale)); }

/* month view — outer keeps the fixed border/rounded corners, .month-grid-scroll is the
   part that actually scrolls horizontally (swipeable) when the grid can't fully fit,
   and .month-grid itself has a minimum width so cells stay readable instead of being
   squeezed down to fit a narrow screen. */
.month-grid-outer { background: var(--surface); border: 1px solid var(--line); border-radius: 10px; overflow: hidden; }
.month-grid-scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; }
.month-grid { display: grid; grid-template-columns: repeat(7, minmax(0, 1fr)); min-width: 770px; }
.month-dow { text-align: center; font-size: calc(12px * var(--font-scale)); font-weight: 600; color: var(--ink-soft); padding: 8px 0; border-bottom: 1px solid var(--line); background: #F7F8FA; }
.month-cell {
  border: none; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line);
  background: var(--surface); min-height: calc(118px * var(--font-scale)); min-width: 0; padding: 8px; cursor: pointer;
  display: flex; flex-direction: column; gap: 5px; align-items: flex-start; text-align: left;
}
.month-cell:hover { background: #FAF6EE; }
.month-cell.muted-cell { color: #B7C0CB; background: #FAFBFC; }
.month-daynum { font-family: 'IBM Plex Mono', monospace; font-size: calc(13px * var(--font-scale)); }
.month-cell.today .month-daynum {
  background: var(--brass); color: #fff; border-radius: 50%; width: calc(22px * var(--font-scale)); height: calc(22px * var(--font-scale));
  display: flex; align-items: center; justify-content: center; font-weight: 700;
}
.month-chips { display: flex; flex-direction: column; gap: 3px; width: 100%; min-width: 0; }
.month-chip {
  background: color-mix(in srgb, var(--chip-color) 20%, white); border-left: 3px solid var(--chip-color);
  color: var(--ink); border-radius: 4px; padding: 2px 6px 2px 5px; width: 100%; min-width: 0; box-sizing: border-box;
  display: flex; flex-direction: column; gap: 0; border-top: none; border-right: none; border-bottom: none; text-align: left; font-family: inherit; cursor: pointer;
}
.month-chip:hover { background: color-mix(in srgb, var(--chip-color) 32%, white); }
.month-chip-line1 { font-size: calc(10px * var(--font-scale)); font-weight: 700; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; line-height: 1.3; }
.month-chip-line2 { font-size: calc(9.5px * var(--font-scale)); opacity: 0.92; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; line-height: 1.25; }
.month-more { font-size: calc(10.5px * var(--font-scale)); color: var(--ink-soft); }

/* week view — day blocks (transposed: rooms as rows, time as columns) */
.day-block { background: var(--surface); border: 1px solid var(--line); border-radius: 10px; margin-bottom: 14px; overflow: hidden; transition: box-shadow 0.3s, border-color 0.3s; }
.day-block-highlight { border-color: var(--brass); box-shadow: 0 0 0 2px rgba(184,134,58,0.35); }
.day-block-head { padding: 8px 14px; border-bottom: 1px solid var(--line); background: #F7F8FA; display: flex; gap: 8px; align-items: baseline; }
.day-block-head.today { background: #FBF3E3; }
.day-block-dow { font-size: calc(13px * var(--font-scale)); font-weight: 700; }
.day-block-date { font-family: 'IBM Plex Mono', monospace; color: var(--ink-soft); font-size: calc(12px * var(--font-scale)); }
.day-block-empty { padding: 16px; color: var(--ink-soft); font-size: calc(13px * var(--font-scale)); }
.day-loc-header-row {
  display: flex; background: #F3F0E9; border-bottom: 1px solid var(--line);
  position: sticky; top: var(--day-head-h); z-index: 3;
}
.day-loc-header-label {
  width: var(--room-col-w); flex-shrink: 0; position: sticky; left: 0; background: #F3F0E9; z-index: 2;
  padding: 6px 8px; display: flex; align-items: center; gap: 6px; cursor: pointer; overflow: hidden;
}
.day-loc-header-label .loc-group-name { font-size: calc(12px * var(--font-scale)); font-weight: 700; color: var(--ink); flex: 1; min-width: 0; overflow: hidden; white-space: nowrap; text-overflow: ellipsis; }
.day-loc-header-label .loc-group-count { font-family: 'IBM Plex Mono', monospace; font-size: calc(10.5px * var(--font-scale)); color: var(--ink-soft); flex-shrink: 0; }
.day-loc-header-label input[type="checkbox"] { width: 13px; height: 13px; accent-color: var(--brass); cursor: pointer; flex-shrink: 0; }
.loc-group-hidden-dot { color: var(--brass-dark); font-size: calc(9px * var(--font-scale)); flex-shrink: 0; }
.day-loc-header-track { flex-shrink: 0; cursor: pointer; }
.day-scroll { overflow-x: auto; overflow-y: auto; -webkit-overflow-scrolling: touch; max-height: 360px; }
.day-inner {
  display: inline-block; min-width: 100%; position: relative; --day-head-h: calc(26px * var(--font-scale));
  padding-bottom: calc(var(--day-head-h) * 1.6);
}
.day-timeheader { display: flex; border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 4; background: var(--surface); height: var(--day-head-h); box-sizing: border-box; }
.day-room-label-spacer { width: var(--room-col-w); flex-shrink: 0; border-right: 1px solid var(--line); position: sticky; left: 0; top: 0; background: var(--surface); z-index: 5; }
.day-timeheader-track { display: flex; }
.day-time-tick { flex-shrink: 0; font-family: 'IBM Plex Mono', monospace; font-size: calc(10px * var(--font-scale)); color: var(--ink-soft); padding: 4px 0 4px 3px; border-left: 1px solid #EEF1F5; box-sizing: border-box; }
.day-room-row { display: flex; border-bottom: 1px solid #EEF1F5; }
.day-room-row:last-child { border-bottom: none; }
.day-room-label { width: var(--room-col-w); flex-shrink: 0; border-right: 1px solid var(--line); position: sticky; left: 0; background: var(--surface); z-index: 2; padding: 6px 8px; display: flex; gap: 6px; align-items: flex-start; font-size: calc(12px * var(--font-scale)); }
.day-room-label .cat-dot { margin-top: 4px; flex-shrink: 0; }
.day-room-label-text { min-width: 0; flex: 1; overflow: hidden; }
.day-room-label-text span { display: block; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.day-room-track { position: relative; height: calc(36px * var(--font-scale)); display: flex; }
.day-slot-cell { flex-shrink: 0; height: 100%; border: none; border-left: 1px solid #F1F3F6; background: transparent; cursor: pointer; padding: 0; box-sizing: border-box; }
.day-slot-cell:hover { background: #FAF6EE; }
.day-booking-block {
  position: absolute; top: 3px; bottom: 3px; border-radius: 4px; color: var(--ink); padding: 2px 7px 2px 6px;
  background: color-mix(in srgb, var(--chip-color) 20%, white); border-left: 3px solid var(--chip-color);
  overflow: hidden; box-sizing: border-box; cursor: pointer; z-index: 1;
  display: flex; flex-direction: column; justify-content: center; border-top: none; border-right: none; border-bottom: none; text-align: left; font-family: inherit;
}
.day-booking-block:hover { background: color-mix(in srgb, var(--chip-color) 32%, white); }
.day-booking-time { font-size: calc(10.5px * var(--font-scale)); font-weight: 700; line-height: 1.25; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.day-booking-purpose { font-size: calc(10px * var(--font-scale)); line-height: 1.2; opacity: 0.95; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

/* week view — alternate "by room" layout: a single grid with rooms as rows (left,
   sticky) and all 7 days of the week as columns (top, sticky). Complements the
   "by day" layout above rather than replacing it — switched via the 依日期/依教室
   toggle next to the 月/週 buttons.
   .roomgrid-wrap is given overflow:auto (both axes) so that position:sticky on the
   date-header row and the location-header rows actually has something to stick against
   while scrolling (an unbounded overflow-x-only container never triggers sticky, since
   it never scrolls vertically itself). Its actual height is set from JS (see
   refitRoomGrid in app.js) rather than a fixed/guessed CSS value, so it always fills
   down to the bottom of the viewport exactly, regardless of how tall the toolbar above
   it ends up being. */
.roomgrid-wrap {
  overflow: auto; -webkit-overflow-scrolling: touch; background: var(--surface); border: 1px solid var(--line); border-radius: 10px;
  width: 100%; box-sizing: border-box;
  /* 實際高度由 JS 量測「這個元素到視窗底部還剩多少空間」後直接設定（見 app.js 的
     refitRoomGrid），這樣不管上方工具列/字體大小/裝置高度怎麼變，都能精準貼齊
     視窗底部，不會再算錯留下一截空白，也不會需要用固定或用猜的高度。 */
}
.roomgrid {
  display: grid; grid-template-columns: var(--room-col-w) repeat(7, minmax(112px, 1fr)); width: 100%; min-width: fit-content;
  position: relative; --roomgrid-head-h: calc(44px * var(--font-scale));
  /* 多留一點底部空間，確保捲到最底時，最後一列還能完全滑出固定表頭（日期列+地點列）的
     覆蓋範圍，不會有最後幾筆行程被蓋住看不到的狀況。 */
  padding-bottom: calc(var(--roomgrid-head-h) * 1.6);
}
.roomgrid-corner { position: sticky; left: 0; top: 0; z-index: 6; height: var(--roomgrid-head-h); box-sizing: border-box; background: var(--surface); border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.roomgrid-daycol-head {
  position: sticky; top: 0; z-index: 5; height: var(--roomgrid-head-h); box-sizing: border-box; background: #F7F8FA; border-bottom: 1px solid var(--line); border-left: 1px solid var(--line);
  padding: 6px 6px; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 2px;
}
.roomgrid-daycol-head.today { background: #FBF3E3; }
.roomgrid-daycol-dow { font-size: calc(12px * var(--font-scale)); font-weight: 700; }
.roomgrid-daycol-date { font-family: 'IBM Plex Mono', monospace; color: var(--ink-soft); font-size: calc(11px * var(--font-scale)); }
/* 地點標題列固定在日期列正下方，捲動時不會被捲走（跟日期列一起形成兩層凍結標題）；
   用跟日期列高度相同的變數對齊，字體變大、日期列變高時，這個 top 位移也會一起跟著調整。
   拆成「左邊獨立的標籤格」+「每天各自獨立的色塊格」兩種元素（而不是用一個橫跨全部欄位
   的元素），是因為橫跨多欄的 sticky 元素在部分瀏覽器裡橫向捲動會卡住不動；改成跟日期列
   完全一樣「每欄各自獨立」的寫法，就能沿用日期列本來就正常的橫向捲動行為。 */
.roomgrid-loc-label {
  position: sticky; left: 0; top: var(--roomgrid-head-h); z-index: 4; box-sizing: border-box;
  display: flex; align-items: center; gap: 7px; padding: 7px 10px; cursor: pointer; user-select: none;
  background: #F3F0E9; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line);
}
.roomgrid-loc-label:hover { background: #EEE8DA; }
.roomgrid-loc-bar {
  position: sticky; top: var(--roomgrid-head-h); z-index: 3; box-sizing: border-box;
  background: #F3F0E9; border-left: 1px solid var(--line); border-bottom: 1px solid var(--line); cursor: pointer;
}
.roomgrid-loc-bar:hover { background: #EEE8DA; }
.roomgrid-room-label {
  position: sticky; left: 0; z-index: 2; background: var(--surface); border-right: 1px solid var(--line); border-bottom: 1px solid #EEF1F5;
  padding: 6px 8px; display: flex; align-items: center; gap: 6px; font-size: calc(12px * var(--font-scale)); min-width: 0;
}
.roomgrid-room-label .cat-dot { flex-shrink: 0; }
.roomgrid-room-label-text { flex: 1; min-width: 0; overflow: hidden; white-space: nowrap; text-overflow: ellipsis; }
.roomgrid-cell {
  border: none; border-left: 1px solid var(--line); border-bottom: 1px solid #EEF1F5; background: transparent; cursor: pointer;
  padding: 3px; display: flex; flex-direction: column; gap: 3px; align-items: stretch; text-align: left; min-height: calc(40px * var(--font-scale));
}
.roomgrid-cell:hover { background: #FAF6EE; }
.roomgrid-cell.today { background: #FFFDF7; }
.roomgrid-chip {
  color: var(--ink); background: color-mix(in srgb, var(--chip-color) 20%, white); border-left: 3px solid var(--chip-color);
  border-radius: 4px; padding: 2px 6px 2px 5px; border-top: none; border-right: none; border-bottom: none; text-align: left; font-family: inherit; cursor: pointer;
  display: flex; flex-direction: column; gap: 0; min-width: 0; width: 100%;
}
.roomgrid-chip:hover { background: color-mix(in srgb, var(--chip-color) 32%, white); }
.roomgrid-chip-time { font-size: calc(9.5px * var(--font-scale)); font-weight: 700; line-height: 1.25; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.roomgrid-chip-purpose { font-size: calc(9px * var(--font-scale)); line-height: 1.2; opacity: 0.92; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

/* 週曆左側「教室」欄寬度調整把手：依日期／依教室兩種版面共用，拖曳時同步更新
   CSS 變數 --room-col-w，兩種版面的欄寬會一起連動改變。 */
.col-resize-handle {
  position: absolute; top: 0; left: var(--room-col-w); width: 7px; height: 100%;
  transform: translateX(-3.5px); cursor: col-resize; z-index: 9; background: transparent; touch-action: none;
}
.col-resize-handle:hover, .col-resize-handle:active { background: rgba(184, 134, 58, 0.35); }


/* modal */
.modal-backdrop { position: fixed; inset: 0; background: rgba(30,42,56,0.45); display: flex; align-items: center; justify-content: center; z-index: 50; padding: 20px; }
.modal { background: var(--surface); border-radius: 12px; width: 100%; max-width: 560px; max-height: 90vh; overflow-y: auto; box-shadow: 0 20px 60px rgba(0,0,0,0.25); }
.modal-head { display: flex; align-items: center; justify-content: space-between; padding: 18px 22px; border-bottom: 1px solid var(--line); }
.modal-head h2 { font-size: calc(16px * var(--font-scale)); margin: 0; }
.icon-btn { background: none; border: none; cursor: pointer; color: var(--ink-soft); font-size: calc(18px * var(--font-scale)); padding: 4px; }
.modal-body { padding: 18px 22px; display: flex; flex-direction: column; gap: 12px; }
.field { display: flex; flex-direction: column; gap: 5px; flex: 1; }
.field span { font-size: calc(12.5px * var(--font-scale)); font-weight: 600; color: var(--ink-soft); }
.field input, .field select, .field textarea { border: 1px solid var(--line); border-radius: 7px; padding: 8px 10px; font-size: calc(13.5px * var(--font-scale)); color: var(--ink); background: #fff; }
.field input:focus, .field select:focus, .field textarea:focus { outline: 2px solid var(--brass); border-color: var(--brass); }
.field em { font-style: normal; font-size: calc(11.5px * var(--font-scale)); color: var(--danger); }
.hint-text { font-style: normal; font-size: calc(11px * var(--font-scale)); color: var(--ink-soft); }
.field-row { display: flex; gap: 12px; }
.line-err { font-size: calc(12px * var(--font-scale)); color: var(--danger); margin-top: -6px; }
.modal-foot { display: flex; justify-content: flex-end; gap: 10px; padding: 16px 22px; border-top: 1px solid var(--line); }
.btn-primary { padding: 8px 18px; border-radius: 7px; border: none; background: var(--ink); color: #fff; font-size: calc(13px * var(--font-scale)); font-weight: 600; cursor: pointer; }
.btn-primary:hover { background: #101a26; }
.btn-danger { padding: 6px 12px; border-radius: 6px; border: 1px solid var(--danger); background: #fff; color: var(--danger); font-size: calc(12.5px * var(--font-scale)); cursor: pointer; }
.btn-danger:hover { background: var(--danger); color: #fff; }
.import-help p { margin: 0 0 6px; font-size: calc(12.5px * var(--font-scale)); color: var(--ink-soft); line-height: 1.6; }
.import-columns { font-family: 'IBM Plex Mono', monospace; font-size: calc(11.5px * var(--font-scale)); background: #F7F8FA; border: 1px solid var(--line); border-radius: 6px; padding: 8px 10px; }
.import-summary { font-size: calc(12.5px * var(--font-scale)); }
.import-summary-line { padding: 4px 0; }
.import-summary-line.warn { color: var(--danger); }
.import-error-list { margin: 4px 0 8px; padding-left: 18px; max-height: 160px; overflow-y: auto; color: var(--danger); font-size: calc(12px * var(--font-scale)); }
.import-error-list li { margin-bottom: 3px; }
.detail-room-head { display: flex; gap: 8px; align-items: flex-start; padding-bottom: 10px; border-bottom: 1px solid var(--line); margin-bottom: 4px; }
.detail-room-head .cat-dot { margin-top: 5px; flex-shrink: 0; }
.detail-row { display: flex; gap: 14px; padding: 5px 0; font-size: calc(13px * var(--font-scale)); }
.detail-label { width: 100px; flex-shrink: 0; color: var(--ink-soft); font-size: calc(12.5px * var(--font-scale)); }
.detail-value { flex: 1; word-break: break-word; }

/* admin table */
.admin-filters { flex-direction: row; align-items: center; flex-wrap: wrap; margin-bottom: 12px; }
.admin-filters .side-input { min-width: 160px; width: auto; }
.room-table-scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; border: 1px solid var(--line); border-radius: 10px; background: var(--surface); }
.room-table { width: 100%; min-width: 640px; border-collapse: collapse; }
.room-table th, .room-table td { padding: 10px 14px; text-align: left; border-bottom: 1px solid var(--line); font-size: calc(13.5px * var(--font-scale)); white-space: nowrap; }
.room-table th { background: #F7F8FA; font-weight: 600; color: var(--ink-soft); font-size: calc(12.5px * var(--font-scale)); }
.room-table td.actions { display: flex; gap: 8px; }
.cat-pill { display: inline-flex; align-items: center; gap: 6px; font-size: calc(12px * var(--font-scale)); }

.settings-section { max-width: 420px; }
.settings-form { display: flex; flex-direction: column; gap: 12px; background: var(--surface); border: 1px solid var(--line); border-radius: 10px; padding: 16px; }
.settings-form .field span { display: block; font-size: calc(12.5px * var(--font-scale)); color: var(--ink-soft); margin-bottom: 4px; }
.settings-form input { width: 100%; box-sizing: border-box; }
.settings-form .btn-primary { align-self: flex-start; }
.settings-msg { font-size: calc(12.5px * var(--font-scale)); color: var(--danger); min-height: 1.2em; }
.settings-msg.ok { color: #2E7D32; }

.toast { position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%); background: var(--ink); color: #fff; padding: 10px 20px; border-radius: 8px; font-size: calc(13px * var(--font-scale)); z-index: 60; box-shadow: 0 10px 30px rgba(0,0,0,0.25); }

/* mobile: sidebar becomes a toggle-able off-canvas drawer instead of disappearing entirely —
   the room checklist is needed for the week view to show anything, so hiding it outright
   made week view (and the sidebar's search/filter controls) unusable on phones/small tablets. */
.sidebar-toggle-btn { display: flex; } /* 電腦版也顯示，可手動收合/展開左側教室篩選欄 */

/* 電腦版：手動收合左側篩選欄（收合後 .main 會自動補滿空間，因為 sidebar 從 flex 版面移除） */
@media (min-width: 721px) {
  body.sidebar-collapsed .sidebar { display: none; }
}
.sidebar-backdrop { display: none; }

@media (max-width: 720px) {
  .sidebar-toggle-btn { display: flex; }
  .sidebar {
    position: fixed;
    top: 0; left: 0; bottom: 0;
    z-index: 55;
    transform: translateX(-100%);
    transition: transform 0.22s ease;
    box-shadow: 4px 0 24px rgba(0,0,0,0.18);
  }
  .sidebar.open { transform: translateX(0); }
  .sidebar-backdrop.open {
    display: block;
    position: fixed; inset: 0; z-index: 54;
    background: rgba(15, 20, 28, 0.4);
  }
  .main { --pad-l: max(14px, env(safe-area-inset-left)); --pad-r: max(14px, env(safe-area-inset-right)); padding: 0 var(--pad-r) 20px var(--pad-l); }
  .topbar { padding: max(14px, calc(env(safe-area-inset-top) + 8px)) 0 10px; }
}

/* bulk-delete list modal */
.bulk-delete-filters { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 10px; }
.bulk-delete-filters .side-input { width: auto; flex: 1; min-width: 120px; }
.bulk-delete-list { max-height: 360px; overflow-y: auto; border: 1px solid var(--line); border-radius: 8px; }
.bulk-delete-row { display: flex; align-items: center; gap: 10px; padding: 8px 12px; border-bottom: 1px solid var(--line); font-size: calc(12.5px * var(--font-scale)); }
.bulk-delete-row:last-child { border-bottom: none; }
.bulk-delete-row input[type="checkbox"] { width: 15px; height: 15px; accent-color: var(--brass); cursor: pointer; flex-shrink: 0; }
.bulk-delete-row-main { flex: 1; min-width: 0; }
.bulk-delete-row-title { font-weight: 600; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.bulk-delete-row-sub { color: var(--ink-soft); font-size: calc(11.5px * var(--font-scale)); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.bulk-delete-toolbar { display: flex; justify-content: space-between; align-items: center; margin-bottom: 8px; font-size: calc(12.5px * var(--font-scale)); color: var(--ink-soft); }