/* --- 1. 基礎與變數 --- */
:root {
  --color-primary: #007aff;
  --color-text: #333333;
  --color-text-secondary: #8a8a8a;
  --color-text-countdown: #000000;
  --color-bg: #f9f9f9;
  --color-card-bg: #ffffff;
  --color-border: #e0e0e0;
  --color-danger: #ff3b30;
  --color-label-bg: #eef5ff;
  --color-label-text: #007aff;
  --default-shadow-color: rgba(0, 0, 0, 0.1); 
}

/* 支援深色模式 */
@media (prefers-color-scheme: dark) {
  :root {
    --color-primary: #0a84ff;
    --color-text: #f2f2f7;
    --color-text-secondary: #a0a0a5;
    --color-text-countdown: #ffffff;
    --color-bg: #000000;
    --color-card-bg: #1c1c1e;
    --color-border: #38383a;
    --color-danger: #ff453a;
    --color-label-bg: #32254c;
    --color-label-text: #c08fff;
    --default-shadow-color: rgba(255, 255, 255, 0.1);
  }
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.5;
  padding-bottom: 70px; 
}

/* --- 2. 導覽列 --- */
.nav-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 60px;
  background-color: var(--color-card-bg);
  border-top: 1px solid var(--color-border);
  display: flex;
  justify-content: space-around;
  align-items: center;
  z-index: 1000;
}

.nav-tab {
  background: none;
  border: none;
  color: var(--color-text-secondary);
  font-size: 14px;
  cursor: pointer;
  padding: 10px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
}

.nav-tab .icon {
  font-size: 22px;
}

.nav-tab.active {
  color: var(--color-primary);
  font-weight: 600;
}

/* --- 3. 頁面佈局 --- */
main {
  padding: 16px;
}

.page {
  display: none; 
}

.page.active {
  display: block; 
}

.page-title {
  font-size: 28px;
  font-weight: bold;
  margin-bottom: 16px;
  color: var(--color-text-countdown);
}

/* --- 4. 活動卡片 (核心設計) --- */
.event-card {
  background-color: var(--color-card-bg);
  border-radius: 12px;
  padding: 16px;
  margin-bottom: 12px;
  box-shadow: 0 0 0 2px var(--shadow-color, transparent), 0 2px 8px rgba(0, 0, 0, 0.05); 
  border: 1px solid var(--color-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: box-shadow 0.3s ease, opacity 0.3s ease;
}

.card-details {
  display: flex;
  flex-direction: column;
  gap: 4px;
  flex-grow: 1;
  width: 70%;
}

.card-labels {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center; /* v1.3.0: 對齊圖示 */
}

/* v1.3.0: 通知圖示 */
.notification-icon {
  font-size: 1.1rem;
  line-height: 1;
  vertical-align: middle;
}

.card-label {
  font-size: 11px;
  font-weight: 500;
  padding: 2px 8px;
  border-radius: 10px;
  background-color: var(--color-label-bg);
  color: var(--color-label-text);
}

.card-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-text-countdown);
}

.card-subtitle {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  overflow-wrap: break-word;
}

.card-date {
  font-size: 0.8rem;
  color: var(--color-text-secondary);
}

.card-countdown {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding-left: 10px;
  flex-shrink: 0; 
  width: 30%;
}

.countdown-days {
  font-size: 2.8rem;
  font-weight: bold;
  color: var(--color-text-countdown);
  line-height: 1;
}

.countdown-unit {
  font-size: 0.8rem;
  color: var(--color-text-secondary);
  font-weight: 500;
}

.countdown-expired {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--color-text-secondary);
}

.event-card.archived {
  opacity: 0.6;
  background-color: var(--color-bg);
}

.event-card.archived .card-title,
.event-card.archived .countdown-days {
  color: var(--color-text-secondary);
  text-decoration: line-through;
}

/* --- 5. 篩選器 (Filter Bar) --- */
.filter-bar {
  display: flex;
  gap: 8px;
  overflow-x: scroll; 
  padding-bottom: 10px;
  margin-bottom: 16px;
  -ms-overflow-style: none; 
  scrollbar-width: none; 
}
.filter-bar::-webkit-scrollbar {
  display: none; 
}

.filter-chip {
  flex-shrink: 0; 
  padding: 8px 12px;
  border-radius: 20px;
  background-color: var(--color-border);
  color: var(--color-text);
  font-size: 0.9rem;
  cursor: pointer;
  transition: background-color 0.2s;
  user-select: none; /* v1.3.0: 避免選取文字 */
}

.filter-chip.selected {
  background-color: var(--color-primary);
  color: white;
  font-weight: 600;
}


/* --- 6. 懸浮按鈕 (FAB) & 狀態按鈕 --- */
.fab {
  position: fixed;
  bottom: 80px; 
  right: 20px;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background-color: var(--color-primary);
  color: white;
  font-size: 32px;
  font-weight: lighter;
  line-height: 56px; 
  text-align: center;
  border: none;
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  z-index: 999;
}

.toggle-archived-btn {
  width: 100%;
  padding: 12px;
  background-color: var(--color-card-bg);
  border: 1px solid var(--color-border);
  color: var(--color-primary);
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  margin-bottom: 16px;
}

/* --- 7. 模態視窗 (Modal) 基礎 --- */
.modal-form {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  z-index: 2000;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 16px;
}

.form-content {
  background-color: var(--color-card-bg);
  padding: 24px;
  border-radius: 16px;
  width: 100%;
  max-width: 400px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.modal-detail-content, 
.modal-form-content {
  max-height: 90vh; 
  overflow-y: auto;
}

.form-content h2 {
  font-size: 1.5rem;
  margin-bottom: 8px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-group label {
  font-weight: 500;
  font-size: 0.9rem;
}

.form-group input:not([type="checkbox"]),
.form-group select {
  width: 100%;
  padding: 12px;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  font-size: 1rem;
  background-color: var(--color-bg);
  color: var(--color-text);
  transition: background-color 0.2s;
}
.form-group input:disabled,
.form-group select:disabled {
    background-color: var(--color-border);
    color: var(--color-text-secondary);
}

.form-group-inline {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.form-group-inline label {
  flex-grow: 1;
}

.form-toggle {
  appearance: none;
  width: 50px;
  height: 28px;
  background-color: var(--color-border);
  border-radius: 14px;
  position: relative;
  cursor: pointer;
}
.form-toggle:checked {
  background-color: var(--color-primary);
}
.form-toggle::before {
  content: '';
  position: absolute;
  top: 2px;
  left: 2px;
  width: 24px;
  height: 24px;
  background-color: white;
  border-radius: 50%;
  transition: transform 0.2s ease;
}
.form-toggle:checked::before {
  transform: translateX(22px);
}

.form-buttons {
  display: flex;
  gap: 12px;
  margin-top: 16px;
}

.form-btn {
  flex-grow: 1;
  padding: 12px;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  border: none;
  cursor: pointer;
}

.btn-secondary {
  background-color: var(--color-border);
  color: var(--color-text);
}

.btn-primary {
  background-color: var(--color-primary);
  color: white;
}
.form-btn.danger {
  background-color: var(--color-danger);
  color: white;
}

/* --- 8. 詳細資料視窗 (Detail Modal) --- */
#event-detail-window {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.detail-item {
  padding: 8px 0;
  border-bottom: 1px dashed var(--color-border);
}
.detail-item:last-child {
    border-bottom: none;
}
.detail-item-label {
  font-size: 0.8rem;
  color: var(--color-text-secondary);
  display: block;
}
.detail-item-value {
  font-size: 1rem;
  font-weight: 500;
  overflow-wrap: break-word;
}

.detail-actions {
  display: flex;
  gap: 8px; /* 縮小間距以容納 4 個按鈕 */
  margin-top: 16px;
}
.detail-actions .form-btn {
    flex-grow: 1;
    font-size: 0.85rem; /* 縮小字體 */
    padding: 10px 5px; /* 減少 padding */
}
.detail-actions #btn-detail-edit {
    flex-grow: 0.8; /* 編輯按鈕小一點 */
}


/* --- 9. 設定頁面與管理子頁面 --- */
.settings-group {
  background-color: var(--color-card-bg);
  border-radius: 12px;
  margin-bottom: 20px;
  overflow: hidden;
  border: 1px solid var(--color-border);
}

.settings-item {
  padding: 14px 16px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--color-border);
  cursor: pointer;
}
.settings-item:last-child {
  border-bottom: none;
}

.settings-item-label {
  font-size: 1rem;
  font-weight: 500;
  flex-grow: 1;
}

.settings-item-value {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
}

.settings-item button {
  width: 100%;
  padding: 12px;
  background: none;
  border: none;
  font-size: 1rem;
  color: var(--color-primary);
  cursor: pointer;
  text-align: left;
}
.settings-item button.danger {
  color: var(--color-danger);
  text-align: center;
}

/* v1.3.0: 通知時間輸入 */
.settings-input-time {
    border: 1px solid var(--color-border);
    border-radius: 8px;
    padding: 5px 8px;
    font-size: 1rem;
    background-color: var(--color-bg);
    color: var(--color-text);
}

/* 預設集顏色管理 (子頁面) */
.preset-item {
    padding: 12px 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--color-border);
    cursor: default;
}
.preset-name {
    font-weight: 600;
    flex-grow: 1;
    margin-right: 16px;
}
.preset-controls {
    display: flex;
    align-items: center;
    gap: 16px;
}

.preset-color-picker {
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
    width: 28px;
    height: 28px;
    padding: 0;
    border: none;
    background: transparent;
    cursor: pointer;
    border-radius: 50%;
    overflow: hidden;
    position: relative;
    border: 2px solid var(--color-text-secondary);
    box-shadow: 0 0 0 2px var(--color-card-bg);
    transition: opacity 0.2s;
}
.preset-color-picker:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}
.preset-color-picker::-webkit-color-swatch-wrapper {
    padding: 0;
}
.preset-color-picker::-webkit-color-swatch {
    border: none;
    border-radius: 50%;
}

/* --- 10. v1.3.0 新表單元素 --- */

/* 標籤勾選 (Feature 6) */
.form-labels-container {
    max-height: 150px;
    overflow-y: auto;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    padding: 10px;
    background-color: var(--color-bg);
}
.label-checkbox-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 4px 0;
}
.label-checkbox-item input[type="checkbox"] {
    width: 18px;
    height: 18px;
}
.label-checkbox-item label {
    font-weight: normal;
}

/* 進階週期 (Feature 4) */
.form-recurrence-container {
    display: flex;
    align-items: center;
    gap: 8px;
}
.form-recurrence-container input[type="number"] {
    width: 80px; /* 限制數字輸入框寬度 */
    flex-grow: 0;
}
.form-recurrence-container select {
    flex-grow: 1; /* 下拉選單佔滿剩餘空間 */
}

/* --- 11. 空狀態與輔助 --- */
.empty-state {
  text-align: center;
  padding: 40px 20px;
  color: var(--color-text-secondary);
}
.empty-state-icon {
  font-size: 40px;
  margin-bottom: 16px;
}