:root {
    --bg: #0c0c1e;
    --card: #161633;
    --card2: #1e1e44;
    --border: #2d2d5e;
    --text: #e0e0f0;
    --text2: #8888bb;
    --accent: #6c5ce7;
    --accent2: #a29bfe;
    --green: #00cec9;
    --radius: 14px;
}

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

body {
    background: var(--bg);
    color: var(--text);
    font-family: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    min-height: 100vh;
}

.app {
    max-width: 1100px;
    margin: 0 auto;
    padding: 24px 20px 60px;
}

/* ===== 头部 ===== */
.header { text-align: center; padding: 36px 0 28px; }
.header h1 {
    font-size: 2.2rem;
    background: linear-gradient(135deg, var(--accent2), var(--green));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.desc { color: var(--text2); margin-top: 6px; font-size: 1.05rem; }

/* ===== 步骤区块 ===== */
.step {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 28px;
    margin-bottom: 22px;
    position: relative;
}
.step-badge {
    position: absolute; top: -14px; left: 24px;
    width: 30px; height: 30px;
    background: var(--accent); color: #fff;
    border-radius: 50%; display: flex; align-items: center; justify-content: center;
    font-weight: 700; font-size: 0.95rem;
}
.step h2 { margin-bottom: 16px; font-size: 1.3rem; }

/* ===== 上传 ===== */
.upload-zone {
    border: 2px dashed var(--border); border-radius: var(--radius);
    padding: 44px 20px; text-align: center; cursor: pointer;
    transition: all .25s ease; background: var(--card2);
}
.upload-zone:hover, .upload-zone.drag-over { border-color: var(--accent); background: #252555; }
.upload-icon { font-size: 2.6rem; }
.upload-zone p { color: var(--text); margin-top: 8px; }
.upload-hint { color: var(--text2); font-size: .85rem; }

.sample-area { margin-top: 14px; display: flex; align-items: center; gap: 10px; color: var(--text2); font-size: .9rem; }
.sample-thumbs { display: flex; gap: 10px; }
.sample-thumb {
    width: 72px; height: 50px; border-radius: 8px; overflow: hidden;
    cursor: pointer; border: 2px solid var(--border); transition: border-color .2s;
}
.sample-thumb:hover { border-color: var(--accent); }
.sample-thumb img { width: 100%; height: 100%; object-fit: cover; }

/* ===== 处理中 ===== */
.processing { text-align: center; padding: 24px 0; }
.spinner {
    width: 52px; height: 52px; border: 4px solid var(--border);
    border-top-color: var(--accent); border-radius: 50%;
    animation: spin .8s linear infinite; margin: 0 auto 16px;
}
@keyframes spin { to { transform: rotate(360deg); } }

.progress-track {
    width: 320px; max-width: 80%; height: 8px;
    background: var(--border); border-radius: 4px; margin: 12px auto; overflow: hidden;
}
.progress-fill { height: 100%; width: 0%; background: linear-gradient(90deg, var(--accent), var(--green)); border-radius: 4px; transition: width .3s; }
#progressPct { color: var(--text2); font-size: .9rem; }

/* ===== 对比行 ===== */
.compare-row { display: flex; gap: 18px; flex-wrap: wrap; margin-bottom: 22px; }
.img-card { flex: 1; min-width: 280px; background: var(--card2); border-radius: 10px; padding: 14px; text-align: center; }
.img-card h3 { font-size: 1rem; margin-bottom: 10px; }
.hint { color: var(--text2); font-size: .8rem; font-weight: 400; }
.img-card canvas { display: block; max-width: 100%; max-height: 400px; border-radius: 6px; background: #000; margin: 0 auto; image-rendering: auto; }

/* ===== 深度图上传区域 ===== */
.depth-upload-area { margin-top: 10px; display: flex; align-items: center; justify-content: center; gap: 8px; flex-wrap: wrap; }
.btn-depth-upload, .btn-depth-reset { font-size: .82rem; padding: 5px 14px; }
.depth-upload-hint { color: var(--text2); font-size: .78rem; }

/* ===== 高级深度调控面板 ===== */
.depth-tuning { margin-bottom: 18px; padding: 16px; background: var(--card2); border-radius: 10px; border: 1px solid var(--border); }
.depth-tuning h3 { font-size: 1rem; margin-bottom: 12px; color: var(--accent2); }
.depth-tuning .hint { color: var(--text2); font-size: .78rem; font-weight: 400; }
.tuning-grid { display: flex; flex-wrap: wrap; gap: 16px; align-items: flex-end; }
.tuning-grid .ctrl-group { display: flex; flex-direction: column; gap: 4px; min-width: 140px; }
.tuning-grid .ctrl-group label { color: var(--text2); font-size: .82rem; }
.tuning-grid .ctrl-group input[type="range"] { width: 130px; accent-color: var(--accent); }
.tuning-grid .ctrl-group span { color: var(--accent2); font-size: .82rem; }
.tuning-grid .ctrl-hint { color: var(--text2); font-size: .72rem; }
.ctrl-check { flex-direction: row !important; align-items: center; gap: 6px !important; }
.ctrl-check label { white-space: nowrap; }
.ctrl-check input[type="checkbox"] { width: 18px; height: 18px; accent-color: var(--accent); cursor: pointer; }
.btn-accent { background: var(--accent) !important; border-color: var(--accent2) !important; color: #fff !important; }
.btn-accent:hover { background: var(--accent2) !important; }

/* ===== 动画控制 ===== */
.anim-controls {
    display: flex; flex-wrap: wrap; gap: 18px; align-items: flex-start;
    margin-bottom: 18px; padding: 16px; background: var(--card2); border-radius: 10px;
}
.ctrl-group { display: flex; flex-direction: column; gap: 4px; }
.ctrl-group label { color: var(--text2); font-size: .82rem; }
.ctrl-group select {
    background: var(--bg); color: var(--text); border: 1px solid var(--border);
    border-radius: 6px; padding: 6px 10px; font-size: .92rem; cursor: pointer;
}
.ctrl-group input[type="range"] { width: 110px; accent-color: var(--accent); }
.ctrl-group span { color: var(--accent2); font-size: .82rem; }
.btn {
    padding: 8px 18px; border: 1px solid var(--border); border-radius: 8px;
    background: var(--card); color: var(--text); font-size: .9rem; cursor: pointer; transition: all .2s;
}
.btn:hover { background: var(--accent); border-color: var(--accent); }
.btn-video { border-color: var(--green); color: var(--green); }
.btn-video:hover { background: rgba(0, 206, 201, 0.1); }

/* ===== 动画视口 ===== */
.anim-viewport { border-radius: 12px; overflow: hidden; background: #000; position: relative; max-height: 520px; }
.anim-viewport:hover .fullscreen-toggle, .anim-viewport:hover .rotate-toggle { opacity: 1; }
.fullscreen-toggle {
    position: absolute; top: 12px; right: 12px; z-index: 10;
    padding: 8px 16px; border: 1px solid rgba(255,255,255,0.35); border-radius: 8px;
    background: rgba(0,0,0,0.55); color: #fff; font-size: .88rem; cursor: pointer;
    opacity: 0; transition: opacity .25s ease, background .2s; backdrop-filter: blur(4px);
}
.fullscreen-toggle:hover { background: rgba(108,92,231,0.7); border-color: var(--accent2); }

.rotate-toggle {
    position: absolute; top: 12px; right: 88px; z-index: 10;
    padding: 8px 16px; border: 1px solid rgba(255,255,255,0.35); border-radius: 8px;
    background: rgba(0,0,0,0.55); color: #fff; font-size: .88rem; cursor: pointer;
    opacity: 0; transition: opacity .25s ease, background .2s; backdrop-filter: blur(4px);
}
.rotate-toggle:hover { background: rgba(108,92,231,0.7); border-color: var(--accent2); }

/* ===== 全屏播放覆盖层 ===== */
.fullscreen-overlay {
    position: fixed; inset: 0; z-index: 9999; background: #000;
    display: flex; justify-content: center; align-items: center;
    width: 100vw !important; height: 100vh !important; max-width: 100vw !important; max-height: 100vh !important;
    aspect-ratio: auto !important; border-radius: 0 !important; margin: 0 !important; padding: 0 !important;
}
.fullscreen-overlay #anim-container { width: 100%; height: 100%; display: flex; justify-content: center; align-items: center; }
.fullscreen-overlay #anim-container canvas { max-width: 100vw; max-height: 100vh; object-fit: contain; }
.fullscreen-overlay .fullscreen-toggle { opacity: 1; top: 20px; right: 20px; font-size: 1rem; padding: 10px 20px; }
.fullscreen-overlay .rotate-toggle { opacity: 1; top: 20px; right: 110px; font-size: 1rem; padding: 10px 20px; }

/* ESC 退出提示 */
.fullscreen-hint {
    position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%); z-index: 10000;
    color: rgba(255,255,255,0.55); font-size: .85rem; pointer-events: none;
    animation: hintFade 3s ease forwards;
}
@keyframes hintFade { 0% { opacity: 0; } 20% { opacity: 1; } 80% { opacity: 1; } 100% { opacity: 0; } }
#anim-container { display: flex; justify-content: center; align-items: center; }
#anim-container canvas { display: block; max-width: 100%; max-height: 520px; border-radius: 6px; image-rendering: auto; }

/* ===== 统计 ===== */
.depth-stats { margin-top: 16px; display: grid; grid-template-columns: repeat(auto-fit, minmax(130px, 1fr)); gap: 10px; }
.stat { background: var(--card2); border-radius: 8px; padding: 12px; text-align: center; }
.stat-label { color: var(--text2); font-size: .78rem; }
.stat-val { color: var(--accent2); font-size: 1.15rem; font-weight: 600; margin-top: 2px; }

/* ===== 导出进度遮罩层 ===== */
.export-overlay {
    position: fixed; inset: 0; z-index: 10000; background: rgba(0, 0, 0, 0.75);
    backdrop-filter: blur(6px); display: none; justify-content: center; align-items: center;
}
.export-modal {
    background: var(--card2); border: 1px solid var(--border); border-radius: var(--radius);
    padding: 30px; width: 340px; text-align: center; box-shadow: 0 10px 30px rgba(0,0,0,0.5);
}
.export-modal h3 { margin-bottom: 15px; font-size: 1.2rem; color: #fff; }
.export-log { margin-top: 15px; color: var(--text2); font-size: 0.95rem; }

/* ===== 新增：SBS 3D 并排图预览区 ===== */
.sbs-preview {
    margin-top: 18px;
    width: 100%;
    overflow: hidden;
    display: flex;
    justify-content: center;
    align-items: center;
    background: #000;
    border-radius: 10px;
    padding: 10px;
    border: 1px solid var(--border);
}

#sbsCanvas {
    transition: width 0.15s ease-out; /* 缩放时增加平滑过渡 */
    width: 100%; /* 默认 100%，由 JS 动态控制 */
    height: auto;
    border-radius: 6px;
    image-rendering: auto;
}

/* ===== 响应式 ===== */
@media (max-width: 640px) {
    .compare-row { flex-direction: column; }
    .anim-controls, .tuning-grid { flex-direction: column; align-items: stretch; }
    .ctrl-group { width: 100%; }
    .ctrl-group input[type="range"], .ctrl-group select { width: 100%; box-sizing: border-box; }
    .header h1 { font-size: 1.5rem; }
    
    /* 移动端保证按钮可见，不依赖 hover */
    .fullscreen-toggle, .rotate-toggle { opacity: 0.85; padding: 6px 12px; font-size: 0.8rem; }
    .rotate-toggle { right: 80px; }
    
    .fullscreen-overlay .rotate-toggle { right: 100px; padding: 8px 16px; font-size: 0.95rem; }
    .fullscreen-overlay .fullscreen-toggle { padding: 8px 16px; font-size: 0.95rem; }
}