/* ==========================================================================
   工具页共用样式（线框图 06–20 的三栏布局 + 全屏课堂模式）
   ========================================================================== */

.tool { position: relative; }
.tool__badge {
  display: inline-block;
  margin-bottom: 14px;
  padding: 3px 12px;
  border-radius: 999px;
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--blue-600);
  font-size: 12.5px;
  font-weight: 600;
}

.tool__grid {
  display: grid;
  gap: 20px;
  grid-template-columns: 1fr;
}
@media (min-width: 1000px) {
  .tool__grid { grid-template-columns: 300px minmax(0, 1fr) 260px; }
  .tool--two .tool__grid { grid-template-columns: 320px minmax(0, 1fr); }
}
@media (min-width: 700px) and (max-width: 999px) {
  .tool__grid { grid-template-columns: 1fr 1fr; }
  .tool__col--main { grid-column: 1 / -1; order: -1; }
}

.tool__col { display: flex; flex-direction: column; gap: 16px; min-width: 0; }

.panel {
  padding: 18px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
}
.panel--muted { background: var(--bg); }
.panel--accent {
  background: var(--bg);
  border-color: var(--yellow-500);
  border-left-width: 4px;
}
.panel__title { margin: 0 0 4px; font-size: 16px; }
.panel--accent .panel__title { color: var(--text); }
.panel__desc { margin: 0 0 14px; color: var(--text-muted); font-size: 13.5px; line-height: 1.6; }
.panel__actions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }
.panel__actions .btn { flex: 1 1 auto; }

/* 中间主显示区 */
.stage {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 20px;
  min-height: 320px;
  padding: 32px 24px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  text-align: center;
}
.stage__label { margin: 0; color: var(--text-muted); font-size: 14px; }
.stage__result {
  margin: 0;
  font-size: clamp(40px, 9vw, 92px);
  font-weight: 800;
  line-height: 1.1;
  color: var(--blue-600);
  letter-spacing: .06em;
  word-break: break-all;
}
.stage__result--placeholder { color: var(--text-muted); font-weight: 500; letter-spacing: 0; }
.stage__hint { margin: 0; color: var(--text-muted); font-size: 13.5px; }
.btn--stage { min-height: 54px; padding: 0 40px; font-size: 17px; font-weight: 600; }

/* 历史记录 / 标签组 */
.chips { display: flex; flex-wrap: wrap; gap: 7px; }
.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  border-radius: 999px;
  background: var(--bg);
  border: 1px solid var(--border);
  font-size: 14px;
}
.chip--recent { background: var(--blue-600); border-color: var(--blue-600); color: var(--text-on-brand); }
.chip__remove {
  border: 0; background: transparent; color: inherit;
  cursor: pointer; font-size: 15px; line-height: 1; padding: 0 2px;
}

/* 名单来源选择器 */
.source__temp { margin-top: 10px; }
.source__temp-actions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 8px; }
.source__actions { display: flex; gap: 8px; margin: 10px 0; }

/* ==========================================================================
   分组结果
   ========================================================================== */

.groups {
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(auto-fill, minmax(190px, 1fr));
  width: 100%;
}
.group-card {
  padding: 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-control);
  background: var(--surface);
}
.group-card__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 10px;
}
.group-card__name {
  border: 1px solid transparent;
  border-radius: 6px;
  background: transparent;
  color: var(--text);
  font: inherit;
  font-weight: 700;
  font-size: 15px;
  padding: 2px 6px;
  min-width: 0;
  width: 100%;
}
.group-card__name:hover { border-color: var(--border); }
.group-card__name:focus { border-color: var(--blue-600); background: var(--bg); }
.group-card__count { color: var(--text-muted); font-size: 12.5px; white-space: nowrap; }
.group-card__list { display: flex; flex-direction: column; gap: 4px; min-height: 30px; }
.group-card.is-drop-target { border-color: var(--blue-600); border-style: dashed; }

.member {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 6px;
  padding: 5px 9px;
  border-radius: 7px;
  background: var(--bg);
  font-size: 14px;
  cursor: grab;
}
.member.is-locked { border: 1px solid var(--yellow-500); }
.member.is-dragging { opacity: .4; }
.member__lock {
  border: 0; background: transparent; cursor: pointer;
  font-size: 13px; line-height: 1; padding: 2px 4px; color: var(--text-muted);
}
.member.is-locked .member__lock { color: var(--text); }

/* ==========================================================================
   随机排序结果
   ========================================================================== */

.order-list { width: 100%; display: flex; flex-direction: column; gap: 5px; }
.order-row {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-control);
  background: var(--surface);
  text-align: left;
}
.order-row.is-fixed { border-color: var(--yellow-500); }
.order-row__no {
  display: flex; align-items: center; justify-content: center;
  width: 28px; height: 28px; border-radius: 50%;
  background: var(--bg); color: var(--blue-600);
  font-size: 13px; font-weight: 700; flex-shrink: 0;
  font-variant-numeric: tabular-nums;
}
.order-row__name { flex: 1; min-width: 0; }
.order-row__pin {
  border: 0; background: transparent; cursor: pointer;
  color: var(--text-muted); font-size: 13px; padding: 4px 6px;
}
.order-row.is-fixed .order-row__pin { color: var(--text); }

/* ==========================================================================
   全屏课堂模式（文档 10.6）
   ========================================================================== */

body.is-fullscreen { overflow: hidden; }

.fs {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: flex;
  flex-direction: column;
  /* 投影环境固定用高对比配色，不跟随暗色模式的低对比装饰色 */
  background: var(--surface);
  color: var(--text);
}
.fs__bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 24px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
.fs__title { font-size: 16px; font-weight: 600; color: var(--text-muted); }
.fs__close {
  min-height: var(--tap-min);
  padding: 0 18px;
  border: 1px solid var(--border);
  border-radius: var(--radius-control);
  background: var(--surface);
  color: var(--text);
  font: inherit;
  font-size: 15px;
  cursor: pointer;
}
.fs__close:hover { border-color: var(--blue-600); color: var(--blue-600); }

.fs__body {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 28px;
  padding: 24px;
  min-height: 0;
  text-align: center;
}

/* 投影字号（文档 10.6 / 第 18 章） */
.fs .stage__result { font-size: clamp(72px, 15vw, 160px); }
.fs .stage__label { font-size: clamp(16px, 2vw, 24px); }
.fs .btn--stage { min-height: 64px; font-size: 20px; padding: 0 52px; }
.fs .chips { justify-content: center; max-width: 900px; }
.fs .chip { font-size: 16px; padding: 6px 14px; }
.fs .groups { max-width: 1400px; }
.fs .group-card__name { font-size: 20px; }
.fs .member { font-size: 19px; padding: 7px 12px; }

/* ==========================================================================
   计时器
   ========================================================================== */

.timer { gap: 16px; }
.timer__time {
  margin: 0;
  font-size: clamp(56px, 13vw, 128px);
  font-weight: 800;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  letter-spacing: .02em;
  color: var(--text);
}
/* 告警级别同时改颜色和字重，不靠颜色单一维度 */
.timer__time[data-level="warn"]     { color: var(--yellow-500); }
.timer__time[data-level="critical"] { color: var(--danger-text); font-weight: 900; }
.timer__time[data-level="done"]     { color: var(--danger-text); font-weight: 900; }
.timer__time.is-flashing { animation: timer-flash 0.7s steps(1) infinite; }
@keyframes timer-flash { 50% { opacity: .25; } }

.timer__bar {
  width: min(100%, 560px);
  height: 8px;
  border-radius: 999px;
  background: var(--border);
  overflow: hidden;
}
.timer__bar-fill {
  height: 100%;
  width: 0%;
  border-radius: 999px;
  background: var(--blue-600);
  transition: width .2s linear;
}
.timer__bar-fill[data-level="warn"]     { background: var(--yellow-500); }
.timer__bar-fill[data-level="critical"],
.timer__bar-fill[data-level="done"]     { background: var(--danger); }

.timer__inputs { display: flex; align-items: center; gap: 8px; }
.timer__inputs .input { width: 90px; }

.fs .timer__time { font-size: clamp(120px, 26vw, 240px); }
.fs .timer__bar { height: 14px; width: min(90%, 1000px); }

/* ==========================================================================
   计分板
   ========================================================================== */

.score-grid {
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(auto-fill, minmax(190px, 1fr));
  width: 100%;
}
.score-card {
  padding: 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  background: var(--surface);
  text-align: center;
}
.score-card__head { display: flex; align-items: center; gap: 6px; margin-bottom: 8px; }
.score-card__rank {
  color: var(--text-muted); font-size: 12.5px; font-weight: 700;
  font-variant-numeric: tabular-nums; flex-shrink: 0;
}
.score-card__name {
  flex: 1; min-width: 0;
  border: 1px solid transparent; border-radius: 6px;
  background: transparent; color: var(--text);
  font: inherit; font-weight: 600; font-size: 14.5px;
  padding: 3px 6px; text-align: left;
}
.score-card__name:hover { border-color: var(--border); }
.score-card__name:focus { border-color: var(--blue-600); background: var(--bg); }
.score-card__score {
  margin: 6px 0 12px;
  font-size: 40px; font-weight: 800; line-height: 1;
  color: var(--blue-600); font-variant-numeric: tabular-nums;
}
.score-card__score.is-bump { animation: score-bump .28s ease-out; }
@keyframes score-bump { 0% { transform: scale(1); } 45% { transform: scale(1.22); } 100% { transform: scale(1); } }
.score-card__buttons { display: grid; grid-template-columns: repeat(4, 1fr); gap: 5px; }
.score-card__buttons .btn { padding: 0 4px; min-height: 36px; }

.fs .score-card__score { font-size: clamp(56px, 7vw, 96px); }
.fs .score-card__name { font-size: 19px; }
.fs .score-grid { grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); max-width: 1500px; }

/* ==========================================================================
   转盘
   ========================================================================== */

.wheel { gap: 18px; }
.wheel__wrap { width: min(100%, 380px); aspect-ratio: 1; }
.wheel__canvas { display: block; width: 100%; height: 100%; }
.fs .wheel__wrap { width: min(58vh, 620px); }

/* ==========================================================================
   成绩统计
   ========================================================================== */

.stat-grid {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  width: 100%;
}
.stat-tile {
  padding: 14px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius-control);
  background: var(--surface);
}
.stat-tile__label { margin: 0; color: var(--text-muted); font-size: 12.5px; }
.stat-tile__value {
  margin: 4px 0 0;
  font-size: 26px; font-weight: 800; line-height: 1.1;
  color: var(--blue-600); font-variant-numeric: tabular-nums;
}
.stat-tile__note { margin: 3px 0 0; color: var(--text-muted); font-size: 11.5px; }

.chart__wrap { width: 100%; height: 300px; }
.chart { display: block; width: 100%; height: 100%; }

.table-wrap { width: 100%; overflow-x: auto; }
.data-table { width: 100%; border-collapse: collapse; font-size: 14.5px; }
.data-table th, .data-table td {
  padding: 8px 12px;
  border-bottom: 1px solid var(--border);
  text-align: left;
  white-space: nowrap;
}
.data-table th { color: var(--text-muted); font-size: 13px; font-weight: 600; }
.data-table tbody tr:hover { background: var(--bg); }
.data-table tr.is-absent td { color: var(--text-muted); }

/* ==========================================================================
   座位表
   ========================================================================== */

.seating-wrap { display: flex; flex-direction: column; gap: 18px; width: 100%; align-items: center; }
.podium {
  padding: 10px 48px;
  border-radius: var(--radius-control);
  background: var(--text);
  color: var(--surface);
  font-weight: 700;
  letter-spacing: .3em;
}
.seating { display: flex; flex-direction: column; gap: 10px; }
.seat-row { display: flex; gap: 10px; align-items: stretch; }
.aisle { width: 26px; flex-shrink: 0; }

.seat {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 106px;
  min-height: 56px;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface);
  font-size: 15px;
  font-weight: 600;
  cursor: grab;
  text-align: center;
}
.seat--empty { background: transparent; border-style: dashed; color: var(--text-muted); font-weight: 400; cursor: default; }
.seat.is-locked { border-color: var(--yellow-500); border-width: 2px; }
.seat.is-dragging { opacity: .4; }
.seat.is-drop-target { border-color: var(--blue-600); border-style: dashed; }
.seat__name { word-break: break-all; }
.seat__lock {
  position: absolute; top: 2px; right: 2px;
  border: 0; background: transparent; cursor: pointer;
  font-size: 11px; padding: 2px; line-height: 1;
}

@media (max-width: 700px) {
  .seat { width: 78px; min-height: 48px; font-size: 13px; }
  .aisle { width: 14px; }
}

/* ==========================================================================
   课程表
   ========================================================================== */

.schedule__title { margin: 0 0 14px; font-size: 20px; text-align: center; }
.schedule { width: 100%; border-collapse: separate; border-spacing: 4px; }
.schedule th, .schedule td { padding: 0; }
.schedule th {
  padding: 8px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 14px;
}
.schedule__corner, .schedule__period { color: var(--text-muted); font-size: 12.5px; white-space: nowrap; }
.schedule__break td {
  padding: 6px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-muted);
  font-size: 12.5px;
  text-align: center;
  letter-spacing: .3em;
}

.schedule-cell {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  width: 100%;
  min-width: 92px;
  min-height: 54px;
  padding: 6px 8px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  color: var(--text);
  font: inherit;
  cursor: pointer;
}
.schedule-cell:hover { border-color: var(--blue-600); }
.schedule-cell__text { font-size: 14.5px; font-weight: 600; }
.schedule-cell__note { font-size: 11.5px; opacity: .75; }
.schedule-cell__add { color: var(--text-muted); font-size: 18px; }
.schedule-cell:not(.has-content) { background: transparent; border-style: dashed; }

/* ==========================================================================
   出题器
   ========================================================================== */

.question-list { width: 100%; margin: 0; padding-left: 26px; }
.question {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 8px 0;
  border-bottom: 1px solid var(--border);
  font-size: 16px;
}
.question__text { font-variant-numeric: tabular-nums; }
.question__answer { color: var(--success-text); font-weight: 700; }
.question__blank { color: var(--text-muted); letter-spacing: .1em; }

/* ==========================================================================
   小测验
   ========================================================================== */

.quiz-card .roster-toolbar { margin-bottom: 14px; }
.q__no { color: var(--text-muted); font-size: 13px; font-weight: 600; }
.q__text { margin: 4px 0 12px; font-size: 16.5px; font-weight: 600; }

.quiz-option {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 7px 10px;
  margin-bottom: 7px;
  border: 1px solid var(--border);
  border-radius: 9px;
  cursor: pointer;
}
.quiz-option:hover { border-color: var(--blue-600); }
.quiz-option.is-correct { border-color: var(--success); background: var(--bg); }
.quiz-option input { width: 18px; height: 18px; accent-color: var(--blue-600); flex-shrink: 0; }
.quiz-option .input { flex: 1; min-height: 36px; }
.quiz-option__letter {
  width: 22px; flex-shrink: 0;
  color: var(--text-muted); font-size: 13px; font-weight: 700;
}

/* ==========================================================================
   二维码 / 文字特效
   ========================================================================== */

.qr-wrap { width: min(100%, 320px); }
.qr-canvas {
  display: block; width: 100%; height: auto;
  border: 1px solid var(--border); border-radius: 12px;
  background: #FFFFFF;   /* 二维码必须白底才扫得出，不跟随主题 */
}

.color-input { min-height: 44px; padding: 4px; cursor: pointer; }

.range { width: 100%; accent-color: var(--blue-600); }
.range__value { color: var(--blue-600); font-variant-numeric: tabular-nums; font-weight: 700; }

.text-stage { min-height: 380px; }
.text-preview {
  max-width: 100%;
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  line-height: 0;
}
/* 透明背景用棋盘格表示，跟设计软件一致 */
.text-preview.is-transparent {
  background-image:
    /* 棋盘格是「无背景」的通用示意，深浅主题下都该长一样，故意不跟随主题 */
    linear-gradient(45deg, #E4E9F2 25%, transparent 25%, transparent 75%, #E4E9F2 75%),
    linear-gradient(45deg, #E4E9F2 25%, transparent 25%, transparent 75%, #E4E9F2 75%);
  background-size: 18px 18px;
  background-position: 0 0, 9px 9px;
  background-color: #FFFFFF;   /* 棋盘格底色，不跟随主题 */
}
.text-canvas { display: block; max-width: 100%; height: auto; }

/* ==========================================================================
   PPT 大纲
   ========================================================================== */

.outline-list { width: 100%; display: flex; flex-direction: column; gap: 8px; }
.outline-row {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-control);
  background: var(--surface);
  flex-wrap: wrap;
}
.outline-row__main { flex: 1; min-width: 200px; display: flex; flex-direction: column; gap: 4px; }
.outline-row__title {
  border: 1px solid transparent; border-radius: 6px;
  background: transparent; color: var(--text);
  font: inherit; font-weight: 600; font-size: 15.5px; padding: 3px 6px;
}
.outline-row__hint {
  border: 1px solid transparent; border-radius: 6px;
  background: transparent; color: var(--text-muted);
  font: inherit; font-size: 13px; padding: 3px 6px;
}
.outline-row__title:hover, .outline-row__hint:hover { border-color: var(--border); }
.outline-row__title:focus, .outline-row__hint:focus { border-color: var(--blue-600); background: var(--bg); }
.outline-row__min {
  color: var(--text-muted); font-size: 12.5px; white-space: nowrap;
  font-variant-numeric: tabular-nums;
}