/* --- THEME DEFINITIONS --- */
/* 預設主題 (薰衣草田) */
:root {
    --page-bg: #f5f3ff; --card-bg: #ffffff; --card-border: #ddd6fe; --heading-color: #6d28d9; --text-color: #5b21b6; --subtle-text-color: #a78bfa; --button-bg: #8b5cf6; --button-text: #ffffff; --accent-color: #7c3aed; --danger-color: #ef4444;
}

/* 主題選擇器 */
#theme-strawberry:checked ~ #page-wrapper { --page-bg: #fff1f2; --card-bg: #ffffff; --card-border: #fecdd3; --heading-color: #be123c; --text-color: #881337; --subtle-text-color: #fb7185; --button-bg: #f43f5e; --button-text: #ffffff; --accent-color: #e11d48; }
#theme-mint:checked ~ #page-wrapper { --page-bg: #f0fdfa; --card-bg: #ffffff; --card-border: #99f6e4; --heading-color: #0d9488; --text-color: #0f766e; --subtle-text-color: #2dd4bf; --button-bg: #14b8a6; --button-text: #ffffff; --accent-color: #14b8a6; }
#theme-lavender:checked ~ #page-wrapper { --page-bg: #f5f3ff; --card-bg: #ffffff; --card-border: #ddd6fe; --heading-color: #6d28d9; --text-color: #5b21b6; --subtle-text-color: #a78bfa; --button-bg: #8b5cf6; --button-text: #ffffff; --accent-color: #7c3aed; }
#theme-orange:checked ~ #page-wrapper { --page-bg: #fffaf0; --card-bg: #ffffff; --card-border: #fde68a; --heading-color: #d97706; --text-color: #b45309; --subtle-text-color: #f59e0b; --button-bg: #f59e0b; --button-text: #ffffff; --accent-color: #f59e0b; }
#theme-blueberry:checked ~ #page-wrapper { --page-bg: #eff6ff; --card-bg: #ffffff; --card-border: #bfdbfe; --heading-color: #1d4ed8; --text-color: #1e3a8a; --subtle-text-color: #60a5fa; --button-bg: #3b82f6; --button-text: #ffffff; --accent-color: #2563eb; }
#theme-caramel-pudding:checked ~ #page-wrapper { --page-bg: #fffbeb; --card-bg: #ffffff; --card-border: #fcd34d; --heading-color: #b45309; --text-color: #78350f; --subtle-text-color: #d97706; --button-bg: #f59e0b; --button-text: #ffffff; --accent-color: #d97706; }
#theme-burgundy-red:checked ~ #page-wrapper { --page-bg: #f4e9e9; --card-bg: #ffffff; --card-border: #800020; --heading-color: #5c001f; --text-color: #4a0404; --subtle-text-color: #900020; --button-bg: #800020; --button-text: #ffffff; --accent-color: #900020; }


/* --- THEME APPLICATION --- */
body { font-family: 'Noto Sans TC', sans-serif; }
#page-wrapper { background-color: var(--page-bg); color: var(--text-color); transition: background-color 0.3s, color 0.3s; }
.themed-card { background-color: var(--card-bg); border-color: var(--card-border); }
.themed-heading { color: var(--heading-color); }
.themed-button-primary { background-color: var(--button-bg); color: var(--button-text); }
.themed-button-primary:hover { background-color: var(--heading-color); }
.themed-accent-text { color: var(--accent-color); }
.themed-accent-text-hover:hover { color: var(--heading-color); }
.themed-button-danger-text { color: var(--subtle-text-color); }
.themed-button-danger-text:hover { color: var(--danger-color); }
.tab-btn.active { color: var(--heading-color); border-bottom-color: var(--heading-color); }
.option-radio:checked { border-color: var(--heading-color); background-color: var(--heading-color); }
input.peer:checked + .toggle-bg { background-color: var(--button-bg); }
.settings-tab-btn.active { color: var(--heading-color); border-bottom-color: var(--heading-color); }


/* --- CUSTOM STYLES & LAYOUT --- */
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.6; }
}
#loading-text {
    animation: pulse 1.5s ease-in-out infinite;
    color: var(--heading-color);
}

/* Input Tabs */
.tab-btn {
    @apply py-3 px-1 border-b-2 border-transparent text-gray-500 hover:text-gray-700 hover:border-gray-300 text-sm font-medium transition-colors;
}
.tab-content { display: none; }
.tab-content.active { display: block; }
.tabs-container::-webkit-scrollbar { display: none; }
.tabs-container { -ms-overflow-style: none; scrollbar-width: none; }

/* Settings Tabs */
.settings-tab-btn {
    @apply pb-2 px-1 border-b-2 border-transparent text-gray-500 hover:text-gray-700 hover:border-gray-300 text-sm font-semibold transition-colors;
}
.settings-tab-content { display: none; }
.settings-tab-content.active { display: block; }

/* *** NEW: Collapsible Settings Card *** */
.collapsible-content {
    max-height: 1000px; /* Adjust as needed */
    overflow: visible;
    transition: max-height 0.5s ease-in-out, opacity 0.3s ease-in-out;
    opacity: 1;
}
#common-settings-card.is-collapsed .collapsible-content {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
}
#common-settings-card.is-collapsed #collapse-settings-btn svg {
    transform: rotate(180deg);
}
#common-settings-card.is-collapsed .mb-4 { /* Reduce bottom margin of title when collapsed */
    margin-bottom: 0;
}


.drag-over { border-color: var(--accent-color) !important; background-color: var(--page-bg) !important; }
.question-card.sortable-ghost { background: var(--page-bg); opacity: 0.7; border-left-color: var(--accent-color); }
.option-radio { -webkit-appearance: none; -moz-appearance: none; appearance: none; border: 2px solid #9ca3af; border-radius: 50%; width: 1.25rem; height: 1.25rem; transition: all 0.2s; margin-right: 0.5rem; flex-shrink: 0; }

/* Theme Chooser */
.theme-chooser {
    cursor: pointer;
    height: 2rem;
    width: 2rem;
    border-radius: 9999px;
    border-width: 2px;
    transition: all 150ms ease-in-out;
}
label.theme-chooser[for="theme-strawberry"] { background-color: #fff1f2; border-color: #fecdd3; }
label.theme-chooser[for="theme-mint"] { background-color: #f0fdfa; border-color: #99f6e4; }
label.theme-chooser[for="theme-lavender"] { background-color: #f5f3ff; border-color: #ddd6fe; }
label.theme-chooser[for="theme-orange"] { background-color: #fffaf0; border-color: #fde68a; }
label.theme-chooser[for="theme-blueberry"] { background-color: #eff6ff; border-color: #bfdbfe; }
label.theme-chooser[for="theme-caramel-pudding"] { background-color: #fffbeb; border-color: #fcd34d; }
label.theme-chooser[for="theme-burgundy-red"] { background-color: #fce7f3; border-color: #fda4af; }

#theme-strawberry:checked ~ #page-wrapper label[for="theme-strawberry"],
#theme-mint:checked ~ #page-wrapper label[for="theme-mint"],
#theme-lavender:checked ~ #page-wrapper label[for="theme-lavender"],
#theme-orange:checked ~ #page-wrapper label[for="theme-orange"],
#theme-blueberry:checked ~ #page-wrapper label[for="theme-blueberry"],
#theme-caramel-pudding:checked ~ #page-wrapper label[for="theme-caramel-pudding"],
#theme-burgundy-red:checked ~ #page-wrapper label[for="theme-burgundy-red"] {
    outline: 3px solid var(--accent-color);
    transform: scale(1.1);
}

/* Visitor Counter */
#visitor-counter {
    font-weight: 500;
    color: var(--text-color);
    min-width: 2rem;
    display: inline-block;
    text-align: center;
}

/* Language Choice Modal */
#language-choice-modal-content.open {
    transform: scale(1);
    opacity: 1;
}

/* Mobile FAB */
#mobile-fab {
    transition: transform 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275), background-color 0.3s ease;
}
#mobile-fab.rotate-180 {
    transform: rotate(180deg);
}
#mobile-fab:active {
    transform: scale(0.9) rotate(var(--tw-rotate, 0deg));
}

/* Input Error Highlight */
.input-error {
    border-color: var(--danger-color) !important;
    box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.2) !important;
    animation: shake 0.5s cubic-bezier(.36,.07,.19,.97) both;
}

@keyframes shake {
  10%, 90% { transform: translate3d(-1px, 0, 0); }
  20%, 80% { transform: translate3d(2px, 0, 0); }
  30%, 50%, 70% { transform: translate3d(-4px, 0, 0); }
  40%, 60% { transform: translate3d(4px, 0, 0); }
}

/* Toast Position Override */
#toast {
    top: 20px !important;
    left: 50% !important;
    transform: translateX(-50%) !important;
    bottom: auto !important;
    right: auto !important;
}
/* 統一按鈕與圖示對齊樣式 */
button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

button svg {
    flex-shrink: 0;
}

#clear-content-btn {
    transition: all 0.2s ease;
}

#clear-content-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 2px 4px rgba(220, 38, 38, 0.1);
}

/* --- TEXTAREA HIGHLIGHTING SYSTEM --- */
.textarea-wrapper textarea,
#text-input-backdrop {
    font-family: 'Noto Sans TC', system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    font-size: 1rem;
    line-height: 1.6;
    padding: 1rem;
    margin: 0;
    box-sizing: border-box;
    width: 100%;
    letter-spacing: normal;
    word-spacing: normal;
    overflow-y: scroll; /* 強制顯示捲軸，確保寬度一致 */
}

#text-input-backdrop {
    color: transparent;
    white-space: pre-wrap;
    word-wrap: break-word;
    border: 2px solid transparent;
    background-color: transparent; /* 確保背景透明 */
    pointer-events: none; /* 讓點擊穿透到 textarea */
    z-index: 5; /* 位於 textarea 下層 */
}

.textarea-wrapper textarea {
    z-index: 10; /* 位於上層 */
    background-color: transparent; /* 讓高亮透出來 */
}

#text-input-backdrop {
    color: transparent;
    white-space: pre-wrap;
    word-wrap: break-word;
    border: 2px solid transparent; /* Match textarea border width */
}

/* 高亮樣式 */
.highlight-keyword {
    background-color: #e0e7ff; /* indigo-100 */
    border-bottom: 2px solid #818cf8; /* indigo-400 */
    border-radius: 2px;
    color: transparent;
}

.highlight-vocab {
    background-color: #d1fae5; /* emerald-100 */
    border-bottom: 2px solid #34d399; /* emerald-400 */
    border-radius: 2px;
    color: transparent;
}

/* 捲軸強化樣式 */
.custom-scrollbar::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}
.custom-scrollbar::-webkit-scrollbar-track {
    background: #f1f1f1;
    border-radius: 10px;
}
.custom-scrollbar::-webkit-scrollbar-thumb {
    background: #c7d2fe; /* indigo-200 */
    border-radius: 10px;
}
.custom-scrollbar::-webkit-scrollbar-thumb:hover {
    background: #818cf8; /* indigo-400 */
}
.custom-scrollbar {
    scrollbar-width: thin;
    scrollbar-color: #c7d2fe #f1f1f1;
}

/* 模擬密碼輸入效果 */
.password-mask {
    -webkit-text-security: disc;
}

/* --- Library UI Enhancement --- */
#work-content-library:not(.hidden) {
    display: flex;
    flex-direction: column;
    justify-content: flex-start; /* 強制頂部對齊 */
    height: 100%; /* 填滿父容器 */
    min-height: 500px;
    padding-top: 0.5rem;
}

#lib-quiz-list {
    flex-grow: 1;
    height: 0; /* 關鍵：讓 flex-grow 正常運作於滾動容器 */
    overflow-y: auto;
    overflow-x: hidden;
    padding-right: 8px;
}

/* 主題化標籤 (Badges) */
.lib-badge {
    background-color: var(--theme-light, #e0e7ff);
    color: var(--theme-color, #4f46e5);
    border: 1px solid var(--theme-border, #c7d2fe);
    padding: 2px 8px;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 600;
}

/* 主題化卡片 */
.lib-card {
    transition: all 0.3s ease;
    border: 1px solid #e5e7eb;
}
.lib-card:hover {
    border-color: var(--theme-color, #4f46e5);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
    transform: translateY(-2px);
}

/* 主題化篩選選單 Focus */
#work-content-library select:focus {
    border-color: var(--theme-color, #4f46e5);
    outline: none;
    box-shadow: 0 0 0 2px var(--theme-light, #e0e7ff);
}

/* 強制版本歷程彈窗高度與捲動 */
#version-modal .flex-col {
    max-height: 80vh !important;
}
#version-history-content {
    max-height: calc(80vh - 100px) !important;
    overflow-y: auto !important;
    display: block !important;
}

/* --- [Phase 2.2] Themed Slider --- */
.themed-range-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--button-bg, #8b5cf6);
    cursor: pointer;
    box-shadow: 0 1px 3px rgba(0,0,0,0.3);
    margin-top: -2px; /* Center alignment adjustment for h-1.5 track */
    transition: background 0.3s ease;
}

.themed-range-slider::-moz-range-thumb {
    width: 16px;
    height: 16px;
    border: none;
    border-radius: 50%;
    background: var(--button-bg, #8b5cf6);
    cursor: pointer;
    box-shadow: 0 1px 3px rgba(0,0,0,0.3);
    transition: background 0.3s ease;
}

/* Override default focus ring to match theme */
.themed-range-slider:focus {
    outline: none;
}
.themed-range-slider:focus::-webkit-slider-thumb {
    box-shadow: 0 0 0 3px var(--card-border, #ddd6fe);
}