/* 座位表管理工具样式：BEM 命名，类名前缀 sp-，避免与全局样式冲突。 */

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

:root {
  --sp-bg: #f5f7fb;
  --sp-panel: #ffffff;
  --sp-ink: #1f2937;
  --sp-muted: #6b7280;
  --sp-line: #e5e7eb;
  --sp-primary: #2563eb;
  --sp-primary-dark: #1d4ed8;
  --sp-accent: #f59e0b;
  --sp-success: #059669;
  --sp-danger: #dc2626;
  --sp-male: #dbeafe;
  --sp-male-ink: #1d4ed8;
  --sp-female: #fce7f3;
  --sp-female-ink: #be185d;
  --sp-empty: #ffffff;
  --sp-aisle: #fef9c3;
  --sp-podium: #fde68a;
  --sp-selected: #2563eb;
  --sp-radius: 10px;
}

.sp-body {
  margin: 0;
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  background: var(--sp-bg);
  color: var(--sp-ink);
}

.sp-shell {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.sp-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 24px;
  background: var(--sp-panel);
  border-bottom: 1px solid var(--sp-line);
  gap: 16px;
}

.sp-topbar__left,
.sp-topbar__right {
  display: flex;
  align-items: center;
  gap: 12px;
}

.sp-topbar__back {
  font-size: 20px;
  color: var(--sp-ink);
  text-decoration: none;
  padding: 4px 10px;
  border-radius: 8px;
}

.sp-topbar__back:hover {
  background: var(--sp-bg);
}

.sp-topbar__class-name {
  font-size: 16px;
  font-weight: 600;
  border: 1px dashed transparent;
  padding: 4px 10px;
  border-radius: 6px;
  background: transparent;
  min-width: 200px;
  color: var(--sp-ink);
}

.sp-topbar__class-name:hover,
.sp-topbar__class-name:focus {
  border-color: var(--sp-line);
  outline: none;
  background: var(--sp-bg);
}

.sp-topbar__save-tip {
  font-size: 12px;
  color: var(--sp-muted);
}

.sp-topbar__chip {
  font-size: 13px;
  padding: 6px 12px;
  border-radius: 999px;
  background: var(--sp-bg);
  color: var(--sp-muted);
  border: 1px solid var(--sp-line);
}

.sp-topbar__chip--button {
  cursor: pointer;
  background: var(--sp-primary);
  color: #fff;
  border-color: var(--sp-primary);
}

.sp-topbar__chip--button:hover {
  background: var(--sp-primary-dark);
}

.sp-topbar__chip--ghost {
  cursor: pointer;
  background: var(--sp-panel);
  color: var(--sp-primary);
  border-color: var(--sp-primary);
}

.sp-topbar__chip--ghost:hover {
  background: rgba(37, 99, 235, 0.08);
}

label.sp-topbar__chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  user-select: none;
}

label.sp-topbar__chip input[type="checkbox"] {
  margin: 0;
  cursor: pointer;
}

.sp-toolbar {
  display: flex;
  align-items: center;
  gap: 10px;
  justify-content: center;
  padding: 12px 24px;
  background: var(--sp-panel);
  border-bottom: 1px solid var(--sp-line);
  flex-wrap: wrap;
}

.sp-toolbar__group {
  display: flex;
  align-items: center;
  gap: 6px;
}

.sp-toolbar__label {
  font-size: 13px;
  color: var(--sp-muted);
}

.sp-toolbar__select {
  padding: 6px 10px;
  border-radius: 8px;
  border: 1px solid var(--sp-line);
  background: var(--sp-panel);
  font-size: 13px;
  min-width: 130px;
}

.sp-toolbar__divider {
  width: 1px;
  height: 24px;
  background: var(--sp-line);
}

.sp-toolbar__btn {
  font-size: 13px;
  padding: 7px 14px;
  border-radius: 8px;
  border: 1px solid var(--sp-line);
  background: var(--sp-panel);
  color: var(--sp-ink);
  cursor: pointer;
}

.sp-toolbar__btn:hover {
  background: var(--sp-bg);
}

.sp-toolbar__btn--primary {
  background: var(--sp-primary);
  border-color: var(--sp-primary);
  color: #fff;
}

.sp-toolbar__btn--primary:hover {
  background: var(--sp-primary-dark);
}

.sp-toolbar__btn--ghost {
  background: transparent;
}

.sp-toolbar__btn--text {
  border: none;
  background: transparent;
  color: var(--sp-muted);
}

.sp-toolbar__btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.sp-main {
  flex: 1;
  padding: 24px;
  display: flex;
  justify-content: center;
}

.sp-canvas {
  background: var(--sp-panel);
  padding: 24px;
  border-radius: 14px;
  border: 1px solid var(--sp-line);
  box-shadow: 0 4px 14px rgba(15, 23, 42, 0.04);
  width: 100%;
  max-width: 1280px;
}

.sp-canvas__hint {
  font-size: 12px;
  color: var(--sp-muted);
  margin-bottom: 14px;
}

.sp-canvas__quickbar {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  padding: 8px 10px;
  margin-bottom: 12px;
  background: var(--sp-panel);
  border: 1px dashed var(--sp-line);
  border-radius: var(--sp-radius);
}

.sp-canvas__quickbar-label {
  font-size: 12px;
  color: var(--sp-muted);
}

.sp-canvas__quickbar-label strong {
  color: var(--sp-primary);
  margin: 0 2px;
}

.sp-grid {
  display: grid;
  gap: 8px;
}

.sp-cell {
  border-radius: var(--sp-radius);
  padding: 10px 8px;
  min-height: 64px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  font-size: 13px;
  cursor: pointer;
  user-select: none;
  border: 2px solid transparent;
  transition: transform 80ms ease, box-shadow 120ms ease;
  background: var(--sp-empty);
}

.sp-cell:hover {
  box-shadow: 0 2px 8px rgba(15, 23, 42, 0.08);
  transform: translateY(-1px);
}

.sp-cell--seat-empty {
  background: var(--sp-empty);
  color: var(--sp-muted);
  border-color: var(--sp-line);
}

.sp-cell--male {
  background: var(--sp-male);
  color: var(--sp-male-ink);
}

.sp-cell--female {
  background: var(--sp-female);
  color: var(--sp-female-ink);
}

.sp-cell--unknown-gender {
  background: #ecfdf5;
  color: #047857;
}

.sp-cell--aisle {
  background: var(--sp-aisle);
  color: #92400e;
  cursor: default;
}

.sp-cell--podium {
  background: var(--sp-podium);
  color: #92400e;
  font-weight: 600;
}

.sp-cell--locked {
  border-color: var(--sp-accent);
}

.sp-cell--selected {
  border-color: var(--sp-selected);
  box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.18);
}

.sp-cell--drag-over {
  outline: 2px dashed var(--sp-primary);
  outline-offset: -2px;
}

.sp-cell__name {
  font-weight: 600;
  font-size: 14px;
}

.sp-cell__attr {
  font-size: 12px;
  color: inherit;
  opacity: 0.85;
}

.sp-cell__lock {
  position: relative;
  font-size: 10px;
  color: var(--sp-accent);
}

.sp-footer {
  display: flex;
  gap: 18px;
  align-items: center;
  padding: 12px 24px;
  background: var(--sp-panel);
  border-top: 1px solid var(--sp-line);
  font-size: 13px;
  color: var(--sp-muted);
}

.sp-footer__stat strong {
  color: var(--sp-ink);
  margin: 0 4px;
}

.sp-footer__status {
  margin-left: auto;
}

.sp-footer__status.success {
  color: var(--sp-success);
}

.sp-footer__status.error {
  color: var(--sp-danger);
}

.sp-mask {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.32);
  opacity: 0;
  pointer-events: none;
  transition: opacity 160ms ease;
  z-index: 10;
}

.sp-mask[data-open="1"] {
  opacity: 1;
  pointer-events: auto;
}

.sp-drawer {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: min(440px, 92vw);
  background: var(--sp-panel);
  border-right: 1px solid var(--sp-line);
  transform: translateX(-100%);
  transition: transform 220ms ease;
  z-index: 20;
  display: flex;
  flex-direction: column;
}

.sp-drawer[data-open="1"] {
  transform: translateX(0);
}

.sp-drawer--right {
  left: auto;
  right: 0;
  border-right: none;
  border-left: 1px solid var(--sp-line);
  transform: translateX(100%);
}

.sp-drawer--right[data-open="1"] {
  transform: translateX(0);
}

.sp-drawer__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 18px;
  border-bottom: 1px solid var(--sp-line);
}

.sp-drawer__header h3 {
  margin: 0;
  font-size: 16px;
}

.sp-drawer__close {
  border: none;
  background: transparent;
  font-size: 22px;
  cursor: pointer;
  color: var(--sp-muted);
}

.sp-drawer__body {
  flex: 1;
  padding: 16px 20px 24px;
  overflow-y: auto;
}

.sp-section {
  margin-bottom: 22px;
}

.sp-section__title {
  font-size: 14px;
  margin: 0 0 10px;
}

.sp-section__hint {
  font-size: 12px;
  color: var(--sp-muted);
  margin: 6px 0 0;
}

.sp-form-grid {
  display: grid;
  gap: 10px 12px;
}

.sp-form-grid--2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.sp-field {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 12px;
  color: var(--sp-muted);
  min-width: 0;
}

.sp-field__label {
  font-size: 12px;
  color: var(--sp-muted);
}

.sp-field--actions {
  justify-content: flex-end;
}

.sp-field--inline {
  flex-direction: row;
  align-items: center;
  gap: 8px;
  margin-top: 8px;
}

.sp-field--inline .sp-field__label {
  white-space: nowrap;
}

.sp-field--inline input {
  width: 80px;
}

.sp-field input,
.sp-field select,
.sp-section textarea {
  padding: 6px 10px;
  border-radius: 8px;
  border: 1px solid var(--sp-line);
  background: var(--sp-panel);
  color: var(--sp-ink);
  font-size: 13px;
  width: 100%;
  min-width: 0;
}

.sp-section textarea {
  font-family: "Consolas", "Menlo", monospace;
  resize: vertical;
}

.sp-btn-group {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.sp-btn-group .sp-btn {
  flex: 0 0 auto;
}

.sp-multi-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  font-size: 13px;
  color: var(--sp-muted);
  margin-top: 10px;
}

.sp-multi-toggle label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--sp-ink);
}

.sp-multi-toggle__count strong {
  color: var(--sp-primary);
  margin: 0 4px;
}

.sp-move-pad {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(3, auto);
  gap: 6px;
  margin-top: 12px;
  max-width: 240px;
}

.sp-move-pad__btn {
  padding: 10px 0;
  text-align: center;
  font-size: 14px;
}

.sp-move-pad__btn--up {
  grid-column: 2;
  grid-row: 1;
}

.sp-move-pad__btn--left {
  grid-column: 1;
  grid-row: 2;
}

.sp-move-pad__btn--clear {
  grid-column: 2;
  grid-row: 2;
  font-size: 12px;
}

.sp-move-pad__btn--right {
  grid-column: 3;
  grid-row: 2;
}

.sp-move-pad__btn--down {
  grid-column: 2;
  grid-row: 3;
}

.sp-students-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 10px;
}

.sp-students-toolbar .sp-section__hint {
  margin: 0 0 0 auto;
}

.sp-students-form {
  display: flex;
  flex-direction: column;
  gap: 10px;
  max-height: 360px;
  overflow-y: auto;
  padding-right: 4px;
}

.sp-student-row {
  border: 1px solid var(--sp-line);
  border-radius: 10px;
  padding: 10px 12px;
  background: #fafbfd;
}

.sp-student-row__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px 10px;
}

.sp-student-row__grid label {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 12px;
  color: var(--sp-muted);
  min-width: 0;
}

.sp-student-row__grid label.sp-student-row__name {
  grid-column: span 2;
}

.sp-student-row__grid input,
.sp-student-row__grid select {
  padding: 6px 10px;
  border-radius: 8px;
  border: 1px solid var(--sp-line);
  background: var(--sp-panel);
  font-size: 13px;
  width: 100%;
  min-width: 0;
}

.sp-student-row__grid input:invalid {
  border-color: var(--sp-danger);
}

.sp-student-row__footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 8px;
  font-size: 12px;
  color: var(--sp-muted);
}

.sp-student-row__remove {
  border: none;
  background: transparent;
  color: var(--sp-danger);
  cursor: pointer;
  font-size: 12px;
  padding: 2px 6px;
  border-radius: 6px;
}

.sp-student-row__remove:hover {
  background: rgba(220, 38, 38, 0.08);
}

.sp-student-row--collapsed {
  padding: 8px 12px;
  cursor: pointer;
  transition: border-color 120ms ease, background 120ms ease, box-shadow 120ms ease;
}

.sp-student-row--collapsed:hover {
  border-color: var(--sp-primary);
  background: #f0f6ff;
  box-shadow: 0 1px 4px rgba(37, 99, 235, 0.08);
}

.sp-student-row--collapsed:focus {
  outline: 2px solid rgba(37, 99, 235, 0.35);
  outline-offset: 1px;
}

.sp-student-row--expanded {
  border-color: var(--sp-primary);
  background: #ffffff;
  box-shadow: 0 2px 8px rgba(15, 23, 42, 0.06);
}

.sp-student-row__summary {
  display: grid;
  grid-template-columns: 28px minmax(72px, 1fr) minmax(0, 2fr) auto;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--sp-ink);
}

.sp-student-row__index {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--sp-bg);
  color: var(--sp-muted);
  font-size: 12px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.sp-student-row__name-text {
  font-weight: 600;
  color: var(--sp-ink);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.sp-student-row__tags {
  font-size: 12px;
  color: var(--sp-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.sp-student-row__placeholder {
  font-style: italic;
  color: var(--sp-muted);
  font-weight: 400;
}

.sp-student-row__footer-actions {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.sp-csv-fallback {
  margin-top: 12px;
  border: 1px dashed var(--sp-line);
  border-radius: 10px;
  padding: 8px 12px;
}

.sp-csv-fallback summary {
  cursor: pointer;
  font-size: 13px;
  color: var(--sp-muted);
  outline: none;
}

.sp-csv-fallback[open] summary {
  margin-bottom: 8px;
  color: var(--sp-ink);
}

.sp-btn--block {
  width: 100%;
}

.sp-btn {
  padding: 6px 12px;
  border-radius: 8px;
  border: 1px solid var(--sp-line);
  background: var(--sp-panel);
  cursor: pointer;
  font-size: 13px;
  color: var(--sp-ink);
}

.sp-btn:hover {
  background: var(--sp-bg);
}

.sp-btn--primary {
  background: var(--sp-primary);
  border-color: var(--sp-primary);
  color: #fff;
}

.sp-btn--primary:hover {
  background: var(--sp-primary-dark);
}

.sp-history__empty {
  font-size: 13px;
  color: var(--sp-muted);
  text-align: center;
  padding: 20px 0;
}

.sp-history__item {
  border: 1px solid var(--sp-line);
  border-radius: 10px;
  padding: 10px 12px;
  margin-bottom: 10px;
}

.sp-history__title {
  font-size: 14px;
  font-weight: 600;
}

.sp-history__meta {
  font-size: 12px;
  color: var(--sp-muted);
  margin: 4px 0 8px;
}

.sp-history__actions {
  display: flex;
  gap: 6px;
}

.sp-history__btn {
  font-size: 12px;
  padding: 4px 10px;
  border-radius: 6px;
  border: 1px solid var(--sp-line);
  background: var(--sp-panel);
  cursor: pointer;
}

.sp-history__btn--restore {
  color: var(--sp-primary);
  border-color: var(--sp-primary);
}

.sp-history__btn--delete {
  color: var(--sp-danger);
  border-color: var(--sp-danger);
}