:root {
    --reader-font-size: 16px;
    --reader-line-height: 1.85;
}

/* 頂部毛玻璃導航欄 */
.app-navbar {
    background: rgba(255, 255, 255, 0.94);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

/* 卡片式工作區容器 */
.source-pane, .target-pane {
    background: #ffffff;
    border: 1px solid #e2e8f0;
    border-radius: 12px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04), 0 1px 2px rgba(0, 0, 0, 0.02);
    transition: border-color 0.2s, box-shadow 0.2s;
}

.source-pane:focus-within {
    border-color: #3b82f6;
    box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.1);
}

.pane-header {
    background-color: #ffffff;
    border-color: #f1f5f9;
}

.pane-footer {
    background-color: #f8fafc;
    border-color: #f1f5f9;
}

/* 分段切換鈕 (Segmented Control) */
.view-mode-toggle {
    display: inline-flex;
    background: #f1f5f9;
    padding: 2px;
    border-radius: 8px;
}

.mode-tab-btn {
    padding: 3px 9px;
    border-radius: 6px;
    color: #64748b;
    font-weight: 500;
    font-size: 11px;
    transition: all 0.15s ease;
}

.mode-tab-btn.active {
    background: #ffffff;
    color: #0f172a;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.08);
}

/* 按鈕風格整合 */
.btn-primary {
    background-color: #2563eb;
    color: #ffffff;
    transition: background-color 0.15s;
}
.btn-primary:hover { background-color: #1d4ed8; }

.btn-secondary {
    background-color: #f1f5f9;
    color: #334155;
    border: 1px solid #cbd5e1;
    transition: background-color 0.15s;
}
.btn-secondary:hover { background-color: #e2e8f0; }

.btn-ghost {
    background-color: transparent;
    transition: background-color 0.15s, color 0.15s;
}
.btn-ghost:hover {
    background-color: #f1f5f9;
}

.font-controls-box {
    background-color: rgba(0, 0, 0, 0.05);
}

/* 抽屜式詞庫面板 */
.glossary-drawer {
    width: 300px;
    position: absolute;
    right: 10px;
    top: 10px;
    bottom: 10px;
    z-index: 30;
    background-color: #ffffff;
    border-color: #e2e8f0;
}

/* 閱讀器排版色調（柔和米紙色） */
.reader-theme-paper {
    background-color: #f7f3e8;
    color: #2b2621;
}

.reader-theme-paper .pane-header {
    background-color: #eee7d5;
    border-color: #e5ded0;
}

/* ---------------- 深色模式修復 (護眼深石板灰，修復看不清原文與白塊問題) ---------------- */
body.dark-mode {
    background-color: #0b1120;
    color: #e2e8f0;
}

body.dark-mode .app-navbar {
    background: rgba(11, 17, 32, 0.94);
    border-color: #1e293b;
}

body.dark-mode .app-navbar span.text-slate-800 {
    color: #f8fafc;
}

/* 頂部選單修復 */
body.dark-mode .header-select-box {
    background-color: #1e293b;
    border-color: #334155;
}

body.dark-mode .header-select-box select {
    color: #f1f5f9;
}

body.dark-mode .header-select-box select option {
    background-color: #1e293b;
    color: #f1f5f9;
}

/* 卡片與容器深色修復 */
body.dark-mode .source-pane {
    background-color: #151e2e;
    border-color: #243044;
}

body.dark-mode .source-pane .pane-header {
    background-color: #151e2e;
    color: #94a3b8;
    border-color: #243044;
}

body.dark-mode .source-pane textarea,
body.dark-mode .source-pane #sourceLineViewer {
    background-color: #151e2e;
    color: #f1f5f9;
}

body.dark-mode .source-pane .pane-footer {
    background-color: #101726;
    border-color: #243044;
}

body.dark-mode .target-pane {
    background-color: #121927;
    border-color: #243044;
    color: #e2e8f0;
}

body.dark-mode .target-pane .pane-header {
    background-color: #0e1522;
    color: #94a3b8;
    border-color: #243044;
}

body.dark-mode .font-controls-box {
    background-color: rgba(255, 255, 255, 0.08);
    color: #cbd5e1;
}

body.dark-mode .view-mode-toggle {
    background-color: #1e293b;
    border-color: #334155;
}

body.dark-mode .mode-tab-btn {
    color: #94a3b8;
}

body.dark-mode .mode-tab-btn.active {
    background-color: #334155;
    color: #f8fafc;
}

body.dark-mode .btn-secondary {
    background-color: #1e293b;
    color: #e2e8f0;
    border-color: #334155;
}
body.dark-mode .btn-secondary:hover { background-color: #334155; }

body.dark-mode .btn-ghost {
    color: #94a3b8;
}
body.dark-mode .btn-ghost:hover {
    background-color: #1e293b;
    color: #f8fafc;
}

/* 抽屜詞庫在 Dark Mode 的深度修復 (原文白皙清晰、編輯框不反白) */
body.dark-mode .glossary-drawer {
    background-color: #131c2e;
    border-color: #223048;
}

body.dark-mode .glossary-drawer .pane-header {
    background-color: #0f1624;
    border-color: #223048;
}

/* 詞庫條目原文顏色 */
.glossary-src-text {
    color: #1e293b;
}
body.dark-mode .glossary-src-text {
    color: #f1f5f9 !important; /* 修正原本黑灰色看不清的問題 */
}

/* 詞庫條目中文譯名顏色 */
.glossary-tgt-text {
    color: #2563eb;
}
body.dark-mode .glossary-tgt-text {
    color: #60a5fa !important;
}

/* 雙向選取高亮修復 (改善刺眼黃底，改為柔和夜讀琥珀光暈) */
.sync-active-source {
    background-color: #fef08a !important;
    border-left: 3px solid #eab308;
    padding-left: 4px;
    border-radius: 2px;
}

.sync-active-target {
    background-color: #fef08a !important;
    border-left: 3px solid #eab308;
    padding-left: 6px;
    border-radius: 2px;
}

body.dark-mode .sync-active-source,
body.dark-mode .sync-active-target {
    background-color: rgba(245, 158, 11, 0.14) !important;
    color: #fde047 !important;
    border-left: 3px solid #eab308;
}

/* 閱讀文字排版 */
.reader-content {
    font-family: -apple-system, BlinkMacSystemFont, "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", sans-serif;
    font-size: var(--reader-font-size);
    line-height: var(--reader-line-height);
    letter-spacing: 0.03em;
    text-align: justify;
}

.reader-content p {
    margin-bottom: 1.25rem;
}

/* 內心獨白樣式 */
.soliloquy-text {
    color: #78716c !important;
    font-style: italic;
    border-left: 2px solid #d6d3d1;
    padding-left: 8px;
    margin-left: 2px;
}

body.dark-mode .soliloquy-text {
    color: #94a3b8 !important;
    border-color: #475569;
}

/* 段落序號徽章標記 (P1, P2...) */
.line-badge {
    font-size: 9px;
    color: #94a3b8;
    user-select: none;
    margin-right: 6px;
    font-family: monospace;
    font-weight: 600;
}

/* 水平拖曳分割條 */
.resizer-h {
    width: 6px;
    cursor: col-resize;
    background-color: #e2e8f0;
    border-radius: 3px;
    transition: background-color 0.2s;
}
.resizer-h:hover, .resizer-h.resizing {
    background-color: #3b82f6;
}

body.dark-mode .resizer-h {
    background-color: #1e293b;
}

/* 垂直拖曳分割條 */
.resizer-v {
    height: 6px;
    cursor: row-resize;
    background-color: #e2e8f0;
    border-radius: 3px;
    transition: background-color 0.2s;
}
.resizer-v:hover, .resizer-v.resizing {
    background-color: #3b82f6;
}

body.dark-mode .resizer-v {
    background-color: #1e293b;
}

/* 隱藏滾動條工具類別 */
.no-scrollbar::-webkit-scrollbar {
    display: none;
}
.no-scrollbar {
    -ms-overflow-style: none;
    scrollbar-width: none;
}

/* 流暢進度條動畫 */
@keyframes indeterminateProgress {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(200%); }
}
.progress-bar-active {
    animation: indeterminateProgress 1.6s infinite ease-in-out;
}

/* 簡約滾動條樣式 */
::-webkit-scrollbar {
    width: 5px;
    height: 5px;
}
::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background: #cbd5e1;
    border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
    background: #94a3b8;
}

body.dark-mode ::-webkit-scrollbar-thumb {
    background: #334155;
}
body.dark-mode ::-webkit-scrollbar-thumb:hover {
    background: #475569;
}