/* ============================================================
   Admin 管理介面（A3）
   ============================================================ */

.admin-page {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.admin-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  padding: 14px 0;
  border-bottom: 2px solid rgba(58, 42, 26, 0.1);
  margin-bottom: 4px;
  flex-wrap: wrap;
}
.admin-header__brand {
  font-size: 22px;
  font-weight: 800;
  color: var(--fg);
}
.admin-header__sub {
  font-size: 12px;
  color: var(--fg-soft);
  margin-top: 2px;
}
.admin-header__title {
  font-size: 18px;
  font-weight: 700;
  color: var(--fg);
  flex: 1;
  text-align: center;
}
.admin-header__tools {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.admin-warn {
  background: rgba(255, 200, 80, 0.2);
  border: 1.5px solid rgba(255, 138, 76, 0.45);
  border-radius: 14px;
  padding: 12px 16px;
  font-size: 14px;
  color: var(--fg);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  justify-content: space-between;
}
.btn-link {
  background: transparent;
  border: none;
  color: var(--accent);
  font-weight: 700;
  cursor: pointer;
  text-decoration: underline;
  padding: 4px 6px;
  font-family: inherit;
  font-size: 14px;
}

.admin-section {
  background: rgba(255, 255, 255, 0.5);
  border-radius: var(--radius-card);
  padding: 16px 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.admin-section--danger {
  background: rgba(255, 200, 200, 0.18);
  border: 1.5px solid rgba(220, 100, 80, 0.35);
}
.admin-section__title {
  font-size: 16px;
  font-weight: 800;
  margin: 0;
  color: var(--fg);
}
.admin-hint {
  font-size: 12px;
  color: var(--fg-soft);
  line-height: 1.5;
}
.admin-empty {
  font-size: 13px;
  color: var(--fg-soft);
  text-align: center;
  padding: 12px;
  background: rgba(236, 220, 185, 0.4);
  border-radius: 10px;
}

/* 學習者卡片 */
.admin-cards {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.admin-card {
  background: #fff;
  border: 2px solid transparent;
  border-radius: 16px;
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  box-shadow: var(--card-shadow);
  transition: border-color 0.2s;
}
.admin-card:hover { border-color: var(--accent); }
.admin-card__head {
  display: flex;
  gap: 12px;
  align-items: center;
}
.admin-card__avatar {
  width: 56px; height: 56px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--accent);
}
.admin-card__info { flex: 1; display: flex; flex-direction: column; gap: 2px; }
.admin-card__name {
  font-size: 17px;
  font-weight: 700;
  color: var(--fg);
}
.admin-card__meta {
  display: flex;
  gap: 8px;
  align-items: center;
}
.admin-card__lv {
  background: rgba(255, 138, 76, 0.15);
  color: var(--accent);
  font-weight: 800;
  font-size: 12px;
  padding: 2px 8px;
  border-radius: 10px;
}
.admin-card__title {
  font-size: 12px;
  color: var(--fg-soft);
}
.admin-card__stats {
  font-size: 12px;
  color: var(--fg-soft);
  margin-top: 2px;
}
.admin-card__actions {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 6px;
}
.admin-card__actions button {
  padding: 8px 12px;
  font-size: 13px;
}
.admin-card__danger {
  color: #b34a30;
  border-color: rgba(220, 100, 80, 0.4);
}
.admin-card__danger:disabled {
  opacity: 0.4;
  cursor: default;
}

/* 詳情頁 */
.admin-detail-hero {
  display: flex;
  gap: 14px;
  align-items: center;
}
.admin-detail-hero__avatar {
  width: 72px; height: 72px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--accent);
}
.admin-detail-hero__name {
  font-size: 22px;
  font-weight: 800;
}
.admin-detail-hero__id {
  font-size: 11px;
  color: var(--fg-soft);
  margin: 2px 0;
}
.admin-detail-hero__lv {
  font-size: 14px;
  font-weight: 700;
  color: var(--accent);
}

.admin-stat-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}
.admin-stat {
  background: rgba(255, 255, 255, 0.6);
  border-radius: 12px;
  padding: 10px 8px;
  text-align: center;
}
.admin-stat__num {
  font-size: 22px;
  font-weight: 800;
  color: var(--accent);
  line-height: 1.2;
}
.admin-stat__lbl {
  font-size: 11px;
  color: var(--fg-soft);
  margin-top: 2px;
}

/* SRS 直方圖 */
.srs-table {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.srs-row {
  display: grid;
  grid-template-columns: 50px 1fr 36px;
  gap: 8px;
  align-items: center;
}
.srs-row__lbl {
  font-size: 12px;
  font-weight: 700;
  color: var(--fg-soft);
}
.srs-row__bar {
  background: rgba(58, 42, 26, 0.08);
  border-radius: 8px;
  height: 16px;
  overflow: hidden;
}
.srs-row__fill {
  background: linear-gradient(90deg, var(--accent), #ffab70);
  height: 100%;
  transition: width 0.4s;
}
.srs-row__num {
  font-size: 12px;
  font-weight: 700;
  color: var(--fg);
  text-align: right;
}

/* 學習日曆 grid */
.cal-grid {
  display: grid;
  grid-template-columns: repeat(15, 1fr);
  gap: 3px;
  padding: 4px 0;
}
.cal-cell {
  aspect-ratio: 1;
  border-radius: 3px;
  background: rgba(58, 42, 26, 0.06);
}
.cal-cell--0 { background: rgba(58, 42, 26, 0.06); }
.cal-cell--1 { background: rgba(255, 138, 76, 0.25); }
.cal-cell--2 { background: rgba(255, 138, 76, 0.5); }
.cal-cell--3 { background: rgba(255, 138, 76, 0.75); }
.cal-cell--4 { background: var(--accent); }

/* record tab 學習日曆補充樣式 */
.record-cal-stats {
  display: flex;
  gap: 16px;
  font-size: 13px;
  color: var(--fg-soft);
  margin-top: 10px;
}
.record-cal-stats strong { color: var(--accent); font-weight: 800; }
.record-cal-legend {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-top: 8px;
  font-size: 11px;
  color: var(--fg-soft);
}
.record-cal-legend .cal-cell {
  width: 12px;
  height: 12px;
  aspect-ratio: unset;
}

/* record tab SRS 分布 chip */
.record-srs { display: flex; flex-direction: column; gap: 6px; }
.record-srs-row {
  display: grid;
  grid-template-columns: 44px 60px 1fr 32px;
  align-items: center;
  gap: 8px;
  padding: 8px 10px;
  border-radius: 12px;
  background: rgba(236, 220, 185, 0.35);
  border: 1.5px solid transparent;
  cursor: pointer;
  font: inherit;
  text-align: left;
  transition: background 0.15s, border-color 0.15s;
}
.record-srs-row:hover:not(:disabled) { background: rgba(255, 138, 76, 0.12); }
.record-srs-row.is-active {
  background: rgba(255, 138, 76, 0.2);
  border-color: var(--accent);
}
.record-srs-row:disabled { opacity: 0.4; cursor: default; }
.record-srs-lv { font-weight: 800; color: var(--accent); font-size: 14px; }
.record-srs-label { font-size: 13px; color: var(--fg); }
.record-srs-bar {
  display: block;
  height: 8px;
  border-radius: 4px;
  background: rgba(58, 42, 26, 0.08);
  overflow: hidden;
}
.record-srs-fill {
  display: block;
  height: 100%;
  background: var(--accent);
  border-radius: 4px;
}
.record-srs-num { font-weight: 800; text-align: right; font-size: 13px; }
.record-srs-hint {
  font-size: 11px;
  color: var(--fg-soft);
  margin-top: 8px;
  text-align: center;
}

/* 事件列表 */
.admin-events {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.admin-event {
  display: grid;
  grid-template-columns: 1fr auto auto auto;
  gap: 10px;
  align-items: center;
  padding: 8px 10px;
  background: rgba(255, 255, 255, 0.65);
  border-radius: 10px;
  font-size: 12px;
}
.admin-event__kind { color: var(--fg); font-weight: 600; }
.admin-event__sid { color: var(--fg-soft); font-family: ui-monospace, monospace; font-size: 11px; }
.admin-event__exp { color: var(--accent); font-weight: 800; }
.admin-event__time { color: var(--fg-soft); font-size: 11px; }

.admin-toolbar {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.admin-toggle {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 0;
  font-size: 14px;
  color: var(--fg);
  cursor: pointer;
}
.admin-toggle input[type="checkbox"] {
  width: 20px;
  height: 20px;
  accent-color: var(--accent);
  cursor: pointer;
}
.admin-card__dev-badge {
  display: inline-block;
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.1em;
  background: rgba(58, 42, 26, 0.9);
  color: #fff;
  padding: 2px 8px;
  border-radius: 8px;
  margin-left: 6px;
}

/* Modal */
.admin-modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(58, 42, 26, 0.55);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9000;
  padding: 16px;
  animation: fade-in-overlay 0.2s ease-out forwards;
}
.admin-modal {
  background: var(--bg);
  border-radius: var(--radius-card);
  border: 3px solid var(--accent);
  padding: 20px 22px;
  max-width: 420px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: 0 16px 40px rgba(0,0,0,0.4);
  animation: scale-up-card 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards;
}
.admin-modal__title {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 800;
}
.admin-modal__hint {
  font-size: 13px;
  color: var(--fg-soft);
  margin: 0 0 12px;
  line-height: 1.6;
}
.admin-modal__actions {
  display: flex;
  gap: 10px;
  justify-content: flex-end;
  margin-top: 6px;
}