/* =========================================
   视频进度条生成器 - Premium UI 专属样式
========================================= */

.main-wrapper {
    max-width: 1360px; /* 控制整体跨度使其更紧凑精致 */
    margin: 0 auto;
}

/* ---- Layout ---- */
.tool-layout {
    display: grid;
    grid-template-columns: 1fr 380px; /* 左侧自适应预览，右侧固定高级属性栏宽度 */
    gap: 24px;
    width: 100%;
    align-items: stretch;
    min-height: calc(100vh - 180px);
}
.left-col {
    display: flex;
    flex-direction: column;
}
.right-col {
    display: flex;
    flex-direction: column;
    height: 100%;
}

/* ---- Panel Overrides (Premium look) ---- */
.panel {
    background: var(--bg-app);
    border-radius: 16px;
    border: 1px solid var(--border-color);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.03);
    overflow: hidden;
}
html.dark-mode .panel {
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
    border-color: rgba(255,255,255,0.06);
    background: rgba(20, 20, 20, 0.6);
    backdrop-filter: blur(20px);
}

.preview-panel {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: 24px;
    gap: 24px;
    /* 固定高度的预览框垂直居中显示 */
    justify-content: center;
    align-items: stretch;
}
.controls-panel {
    flex: 1;
    display: flex;
    flex-direction: column;
    max-height: calc(100vh - 180px);
}

/* ---- Tabs Header ---- */
.tabs-header {
    display: flex;
    background: var(--bg-body);
    border-bottom: 1px solid var(--border-color);
    padding: 0 12px;
}
.tab-btn {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: 16px 4px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    position: relative;
    transition: color 0.2s;
}
.tab-btn:hover { color: var(--text-primary); }
.tab-btn.active {
    color: var(--accent);
}
.tab-btn.active::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 10%;
    right: 10%;
    height: 3px;
    border-radius: 3px 3px 0 0;
    background: var(--accent);
}

/* ---- Tabs Content ---- */
.scrollable-content {
    flex: 1;
    overflow-y: auto;
    padding: 24px;
}
.tab-pane {
    display: none;
    animation: fadeIn 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}
.tab-pane.active {
    display: block;   
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(6px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ---- Form Groups & Titles ---- */
.form-group-title {
    font-size: 13px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 8px;
}
.form-group-title::before {
    content: "";
    display: block;
    width: 4px;
    height: 14px;
    background: var(--accent);
    border-radius: 4px;
}

/* ---- Form Rows & Labels ---- */
.form-row {
    display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 12px;
}
.form-label {
    font-size: 13px; color: var(--text-secondary);
    white-space: nowrap; flex-shrink: 0; min-width: 60px;
}

/* Modern Input overrides */
input[type="text"], input[type="number"], .modern-select {
    background: var(--bg-body);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    padding: 8px 12px;
    font-family: inherit; font-size: 13px; outline: none;
    transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
    flex: 1; min-width: 0;
}
input[type="text"]:focus, input[type="number"]:focus, .modern-select:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
    background: var(--bg-app);
}

/* ---- Pill-button groups (Modernized) ---- */
.pill-group { display: flex; gap: 6px; flex-wrap: wrap; background: var(--bg-body); padding: 4px; border-radius: 10px; }
.pill-group.narrow-group { width: 100%; box-sizing: border-box; }
.pill-btn {
    flex: 1;
    background: transparent; border: none;
    color: var(--text-secondary); padding: 6px 12px; border-radius: 6px;
    cursor: pointer; font-size: 12px; font-weight: 600;
    transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
    text-align: center;
}
.pill-btn.active {
    background: var(--bg-app); color: var(--text-primary);
    box-shadow: 0 2px 6px rgba(0,0,0,0.08);
}
html.dark-mode .pill-btn.active {
    box-shadow: 0 2px 6px rgba(0,0,0,0.3); background: rgba(255,255,255,0.08);
}
.pill-btn:hover:not(.active) { color: var(--text-primary); }

/* Direction Toggle */
.dir-toggle { display: flex; gap: 6px; width: 100%; background: var(--bg-body); padding: 4px; border-radius: 10px; }
.dir-btn {
    flex: 1; background: transparent; border: none;
    color: var(--text-secondary); padding: 8px; border-radius: 6px;
    cursor: pointer; font-size: 13px; text-align: center; font-weight: 600;
    transition: all 0.2s;
}
.dir-btn.active {
    background: var(--bg-app); color: var(--text-primary); box-shadow: 0 2px 6px rgba(0,0,0,0.08);
}
html.dark-mode .dir-btn.active { background: rgba(255,255,255,0.08); box-shadow: 0 2px 6px rgba(0,0,0,0.3); }

/* Range Slider */
.modern-range {
    -webkit-appearance: none; appearance: none;
    flex: 1; height: 6px; border-radius: 3px;
    background: var(--bg-body); outline: none; cursor: pointer;
    box-shadow: inset 0 1px 2px rgba(0,0,0,0.05);
}
html.dark-mode .modern-range { box-shadow: inset 0 1px 3px rgba(0,0,0,0.3); }
.modern-range::-webkit-slider-thumb {
    -webkit-appearance: none; width: 18px; height: 18px; border-radius: 50%;
    background: #fff; cursor: pointer;
    box-shadow: 0 2px 5px rgba(0,0,0,0.2), 0 0 0 1px rgba(0,0,0,0.05);
    transition: transform 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}
.modern-range::-webkit-slider-thumb:hover { transform: scale(1.15); }
html.dark-mode .modern-range::-webkit-slider-thumb { background: #e0e0e0; }
.range-val { font-size: 12px; color: var(--text-secondary); font-family: monospace; min-width: 44px; text-align: right; }

/* Colors */
.modern-color .color-row { display: flex; align-items: center; gap: 8px; flex: 1; background: var(--bg-body); padding: 4px 8px; border-radius: 8px; border: 1px solid var(--border-color); }
input[type="color"] {
    width: 24px; height: 24px; padding: 0; border: none; border-radius: 4px; cursor: pointer; background: none; flex-shrink: 0;
    overflow: hidden;
}
input[type="color"]::-webkit-color-swatch-wrapper { padding: 0; }
input[type="color"]::-webkit-color-swatch { border: none; border-radius: 4px; box-shadow: inset 0 0 0 1px rgba(0,0,0,0.1); }
.color-text { flex: 1; background: transparent !important; border: none !important; font-family: monospace !important; padding: 0 !important; }

/* Buttons */
.btn {
    border-radius: 8px; font-weight: 600; cursor: pointer; transition: all 0.2s;
    user-select: none; text-align: center;
}
.btn-primary {
    background: var(--accent); color: white; border: none;
    box-shadow: 0 4px 14px var(--accent-glow);
}
.btn-primary:hover { filter: brightness(1.1); transform: translateY(-1px); box-shadow: 0 6px 20px var(--accent-glow); }
.btn-primary:active { transform: translateY(1px); }
.btn-normal {
    background: var(--bg-body); border: 1px solid var(--border-color); color: var(--text-primary);
}
.btn-normal:hover { background: var(--bg-hover, rgba(0,0,0,0.05)); }
.btn-sm { padding: 6px 12px; font-size: 12px; }

/* Toggle Switch */
.toggle-switch { position: relative; width: 44px; height: 24px; flex-shrink: 0; cursor: pointer; }
.toggle-switch input { display: none; }
.toggle-track {
    position: absolute; inset: 0; background: var(--bg-body); border: 1px solid var(--border-color);
    border-radius: 12px; transition: all 0.3s;
}
.toggle-thumb {
    position: absolute; top: 2px; left: 2px; width: 18px; height: 18px;
    border-radius: 50%; background: var(--text-secondary);
    transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), background 0.3s;
    box-shadow: 0 2px 4px rgba(0,0,0,0.2);
}
html.dark-mode .toggle-thumb { background: #999; }
.toggle-switch input:checked ~ .toggle-track { background: var(--accent); border-color: var(--accent); }
.toggle-switch input:checked ~ .toggle-thumb { transform: translateX(20px); background: #fff; }
.toggle-label { font-size: 13px; color: var(--text-secondary); cursor: pointer; }

/* ---- Preview area ---- */
.preview-wrap {
    /* 不使用固定高度，完全由 JS 计算出的 aspectRatio 支撑 */
    flex: none;
    align-self: center; /* 防止被父级 stretch 拉伸宽度，保证比例 */
    position: relative;
    overflow: hidden;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    display: flex; align-items: center; justify-content: center;
    background-color: var(--bg-body);
    box-sizing: border-box;
    /* 利用自适应搭配最大宽高以及 aspect-ratio 确保无论怎么拉伸都不会破坏比例 */
    width: auto;
    height: auto;
    max-width: 100%;
    max-height: calc(100vh - 200px); /* 限制最大高度，防止竖屏过长 */
    margin: 0 auto;
}
html.dark-mode .preview-wrap {
    background-color: var(--bg-body);
}
#preview-canvas { 
    display: block; 
    width: 100%;
    height: 100%;
    object-fit: contain; 
    background:
        linear-gradient(45deg, #ccc 25%, transparent 25%),
        linear-gradient(-45deg, #ccc 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, #ccc 75%),
        linear-gradient(-45deg, transparent 75%, #ccc 75%);
    background-size: 20px 20px;
    background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
    background-color: #eee;
    box-shadow: inset 0 2px 10px rgba(0,0,0,0.1);
}
html.dark-mode #preview-canvas {
    background-image:
        linear-gradient(45deg, #222 25%, transparent 25%),
        linear-gradient(-45deg, #222 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, #222 75%),
        linear-gradient(-45deg, transparent 75%, #222 75%);
    background-color: #181818;
}

.scrubber-row { display: flex; align-items: center; gap: 16px; background: var(--bg-body); padding: 12px 16px; border-radius: 12px; border: 1px solid var(--border-color); }
.scrub-play-btn { width: 36px; height: 36px; border-radius: 50%; padding: 0; display: flex; align-items: center; justify-content: center; border: none; background: var(--accent); color: white; box-shadow: 0 4px 10px var(--accent-glow); }
.scrub-play-btn:hover { transform: scale(1.05); }
#time-display { font-family: monospace; font-size: 13px; color: var(--text-secondary); }

/* Style Preset Tabs */
.style-tabs { display: flex; gap: 8px; margin-bottom: 24px; }
.style-tab {
    flex: 1; padding: 12px 8px; border-radius: 10px; text-align: center; font-size: 13px; font-weight: 600;
    cursor: pointer; border: 1px solid var(--border-color); background: var(--bg-body); color: var(--text-secondary);
    transition: all 0.2s; display: flex; flex-direction: column; align-items: center; justify-content: center;
}
.style-tab.active {
    background: var(--accent); color: #fff; border-color: var(--accent);
    box-shadow: 0 6px 16px var(--accent-glow); transform: translateY(-2px);
}
.style-tab:hover:not(.active) { background: var(--bg-app); color: var(--text-primary); border-color: var(--text-tertiary); }

/* Sub sections */
.sub-form-group { padding: 12px; background: var(--bg-body); border-radius: 10px; border: 1px solid var(--border-color); margin-bottom: 12px; }

/* Chapter List */
.chapter-list {
    display: flex; flex-direction: column; gap: 8px;
    max-height: 240px; overflow-y: auto; padding-right: 4px;
}
.chapter-item {
    display: flex; align-items: center; gap: 8px;
    background: var(--bg-body); padding: 6px; border-radius: 8px; border: 1px solid var(--border-color);
}
.chapter-time { width: 70px !important; text-align: center; }
.chapter-name { flex: 1; }
.btn-del {
    width: 32px; height: 32px; border-radius: 6px; border: none; background: rgba(239,68,68,0.1); color: #ef4444; cursor: pointer; transition: all 0.2s;
}
.btn-del:hover { background: #ef4444; color: white; }

/* Export Actions */
.export-actions { display: flex; flex-direction: column; gap: 12px; margin-top: 24px; }
.export-progress { display: none; margin-top: 16px; background: var(--bg-body); padding: 12px; border-radius: 8px; border: 1px solid var(--border-color); }
.export-progress.on { display: block; }
.ep-bar { height: 6px; background: var(--border-color); border-radius: 3px; overflow: hidden; margin-top: 8px; }
.ep-fill { height: 100%; background: var(--accent); border-radius: 3px; width: 0%; transition: width 0.15s linear; }
.ep-row { display: flex; justify-content: space-between; align-items: center; }
.ep-status { font-size: 12px; font-weight: 600; color: var(--text-primary); }

.compat-warn { display: none; margin-top: 12px; padding: 12px; background: rgba(245,158,11,0.1); border-left: 4px solid #f59e0b; border-radius: 0 6px 6px 0; font-size: 12px; color: #d97706; line-height: 1.5; }
html.dark-mode .compat-warn { color: #fcd34d; }

.divider { height: 1px; background: var(--border-color); margin: 20px 0; }

.bulk-area { display: none; margin-top: 12px; background: var(--bg-body); padding: 12px; border-radius: 10px; border: 1px solid var(--border-color); }
.bulk-area.on { display: block; animation: fadeIn 0.3s; }
.modern-textarea { width: 100%; height: 100px; resize: vertical; background: var(--bg-app); border: 1px solid var(--border-color); border-radius: 6px; padding: 10px; font-size: 13px; font-family: monospace; color: var(--text-primary); box-sizing: border-box; margin-top: 8px; outline: none; }
.modern-textarea:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-glow); }

/* Responsive adjustments */
@media (max-width: 1024px) {
    .tool-layout {
        grid-template-columns: 1fr;
        grid-template-rows: auto auto;
    }
    .preview-panel {
        min-height: 50vh;
    }
}

/* Ensure color inputs align better inside their container */
.color-row input[type="color"] {
    width: 28px;
    height: 28px;
    border-radius: 4px;
    border: 1px solid var(--border-color);
}
.color-row input[type="text"] {
    background: transparent;
    border: none;
    box-shadow: none;
}
.color-row input[type="text"]:focus {
    box-shadow: none;
}

/* Preview background controls (macOS 15.7.4 Style) */
.mac-file-upload {
    display: block;
    width: 100%;
    box-sizing: border-box;
    cursor: pointer;
    background: var(--bg-body);
    border: 1px solid var(--border-color); /* 极细描边 */
    border-radius: 10px;
    /* 实体感与精细投影：多层投影 + 柔和外阴影 + 微弱内发光 */
    box-shadow: 
        0 2px 4px rgba(0,0,0,0.02),
        0 6px 12px rgba(0,0,0,0.03),
        inset 0 1px 0 rgba(255,255,255,0.1);
    /* 弹簧曲线动画：阻尼感位移与缩放 */
    transition: transform 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.1),
                background-color 0.2s ease,
                box-shadow 0.3s ease;
    padding: 14px 12px;
    text-align: center;
    user-select: none;
}

html.dark-mode .mac-file-upload {
    background: rgba(40, 40, 40, 0.6);
    border-color: rgba(255,255,255,0.06);
    box-shadow: 
        0 2px 6px rgba(0,0,0,0.2), 
        0 8px 16px rgba(0,0,0,0.3),
        inset 0 1px 0 rgba(255,255,255,0.05); /* 深色内发光 */
    backdrop-filter: blur(12px);
}

.mac-file-upload:hover {
    background: var(--bg-app);
    box-shadow: 
        0 4px 8px rgba(0,0,0,0.04),
        0 12px 24px rgba(0,0,0,0.05),
        inset 0 1px 0 rgba(255,255,255,0.15);
}
html.dark-mode .mac-file-upload:hover {
    background: rgba(50, 50, 50, 0.8);
}

/* 交互：确定性反馈 (下压微缩实体反馈) */
.mac-file-upload:active {
    transform: scale(0.97);
    box-shadow: 0 1px 2px rgba(0,0,0,0.05); 
}

.mac-file-upload-content {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.mac-file-upload-content .icon {
    font-size: 16px;
}

.mac-file-upload-content .text {
    font-size: 13px;
    color: var(--text-primary);
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}