/* ============================================
   MomentStitcher · 柔和奶油设计语言
   令牌驱动，亮/暗双主题（规格 §2）
   ============================================ */
:root {
    --bg: #F5EFE9;
    --surface: #FFFDF9;
    --surface-2: #FFF6EE;
    --primary: #FF7A4D;
    --primary-strong: #F0663A;
    --primary-soft: #FFF1E6;
    --text: #3D2E24;
    --text-2: #B0947E;
    --hairline: #F3E7DC;
    --shadow: 0 2px 12px rgba(180, 140, 110, .12);
    --r-card: 16px;
    --r-tile: 10px;
    --r-small: 8px;
    --dur: .18s;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #201914;
        --surface: #2A211B;
        --surface-2: #332821;
        --primary: #FF8A5E;
        --primary-strong: #FF9E78;
        --primary-soft: #4A3327;
        --text: #F3EAE2;
        --text-2: #C4A88E;
        --hairline: #3A2E25;
        --shadow: 0 2px 12px rgba(0, 0, 0, .35);
    }
}

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

[hidden] { display: none !important; }

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    min-height: 100dvh;
    padding: 20px;
    display: flex;
    flex-direction: column;
    position: relative;
    isolation: isolate;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body::before {
    content: '';
    position: fixed;
    z-index: 0;
    inset: -45%;
    background: linear-gradient(115deg, transparent 38%, var(--primary) 48%, transparent 58%);
    opacity: .055;
    transform: translate3d(-18%, -10%, 0);
    animation: backgroundDrift 18s ease-in-out infinite alternate;
    pointer-events: none;
}

@keyframes backgroundDrift {
    to { transform: translate3d(18%, 10%, 0) rotate(4deg); }
}

.app { position: relative; z-index: 1; width: 100%; max-width: 1280px; margin: auto; }

/* 页头 */
.app-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    flex-wrap: wrap;
    padding: 6px 4px 14px;
}
.app-header .brand { display: flex; flex-direction: column; }
.app-header h1 { font-size: 22px; font-weight: 800; display: inline; letter-spacing: .5px; }
.brand-mark { color: var(--primary); }
.tagline { font-size: 13px; color: var(--text-2); margin-top: 2px; }

/* 版本切换按钮 */
.version-switch {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    margin-left: auto;
    padding: 9px 18px;
    border-radius: 999px;
    font-size: 13px;
    font-weight: 700;
    line-height: 1;
    color: #fff;
    background: linear-gradient(135deg, var(--primary), var(--primary-strong));
    box-shadow: 0 4px 12px rgba(255, 122, 77, .35);
    text-decoration: none;
    white-space: nowrap;
    cursor: pointer;
    transition: transform var(--dur) ease-out, box-shadow var(--dur) ease-out, filter var(--dur) ease-out;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
}
.version-switch:hover { transform: translateY(-1px); box-shadow: 0 6px 16px rgba(255, 122, 77, .45); filter: brightness(1.03); }
.version-switch:active { transform: scale(.96); }
.version-switch svg { flex-shrink: 0; }

/* 双栏工作区 */
.workspace {
    display: grid;
    grid-template-columns: 5fr 7fr;
    gap: 14px;
    align-items: start;
}
.panel {
    background: var(--surface);
    border-radius: var(--r-card);
    padding: 14px;
    box-shadow: var(--shadow);
}

/* 拖放卡 */
.upload-card {
    background: var(--surface-2);
    border: 2px dashed var(--primary);
    border-radius: 14px;
    padding: 22px 14px;
    text-align: center;
    color: var(--text-2);
    cursor: pointer;
    transition: transform var(--dur) ease-out, background var(--dur) ease-out;
    -webkit-tap-highlight-color: transparent;
    user-select: none;
    -webkit-user-select: none;
}
.upload-card:hover { background: var(--primary-soft); }
.upload-card.dragover { background: var(--primary-soft); transform: scale(1.01); }
.upload-card .i { display: inline-block; width: 26px; height: 26px; color: var(--primary); }
.upload-card .i svg { width: 26px; height: 26px; }
.upload-hint { margin: 6px 0 10px; font-size: 13px; }

/* 按钮 */
.btn {
    border: none;
    border-radius: 12px;
    padding: 10px 22px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: transform var(--dur) ease-out, background var(--dur) ease-out, opacity var(--dur) ease-out;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
}
.btn:active { transform: scale(.97); }
.btn-primary { background: var(--primary); color: #fff; box-shadow: 0 4px 10px rgba(255, 122, 77, .35); }
.btn-primary:hover:not(:disabled) { background: var(--primary-strong); }
.btn-primary:disabled { background: var(--hairline); color: var(--text-2); box-shadow: none; cursor: not-allowed; }
.btn-soft { background: var(--surface-2); color: var(--primary); }
.btn-soft:hover { background: var(--primary-soft); }
.btn-ghost { background: transparent; color: var(--text-2); border: 1px solid var(--hairline); }
.btn-ghost:hover:not(:disabled) { color: var(--primary); }

.icon-btn {
    width: 34px;
    height: 34px;
    border: none;
    border-radius: 10px;
    background: var(--surface-2);
    color: var(--text-2);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0;
    transition: transform var(--dur) ease-out, color var(--dur) ease-out;
    -webkit-tap-highlight-color: transparent;
}
.icon-btn:hover { color: var(--primary); }
.icon-btn:active { transform: scale(.94); }
.icon-btn svg, .i svg { width: 18px; height: 18px; display: block; margin: auto; }
.icon-btn.flip svg { transform: rotate(180deg); }

/* 参数行 */
.params-row {
    display: flex;
    gap: 10px;
    align-items: center;
    flex-wrap: wrap;
    background: var(--surface);
    border-radius: 12px;
    padding: 8px 12px;
    margin-bottom: 12px;
}
.field { font-size: 13px; color: var(--text-2); display: inline-flex; align-items: center; gap: 6px; }
.field input[type="number"] {
    width: 64px;
    padding: 6px;
    border: 1px solid var(--hairline);
    border-radius: var(--r-small);
    background: var(--surface);
    color: var(--text);
    text-align: center;
}
.field-quality { margin-left: auto; }
.field-quality input[type="range"] { accent-color: var(--primary); }
#qualityValue { min-width: 38px; font-variant-numeric: tabular-nums; }

/* 图片池磁贴 */
.pool-tiles {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(76px, 1fr));
    gap: 8px;
    margin-top: 10px;
    min-height: 60px;
}
.pool-image {
    position: relative;
    aspect-ratio: 1;
    border-radius: var(--r-tile);
    overflow: hidden;
    cursor: grab;
    background: var(--surface-2);
    border: 1px solid var(--hairline);
    transition: transform var(--dur) ease-out, box-shadow var(--dur) ease-out;
    -webkit-tap-highlight-color: transparent;
    -webkit-touch-callout: none;
    user-select: none;
    -webkit-user-select: none;
    will-change: transform;
}
.pool-image:hover { transform: translateY(-2px); box-shadow: var(--shadow); }
.pool-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    pointer-events: none;
    display: block;
    background: var(--hairline);
}
.pool-image .image-info {
    position: absolute;
    left: 0; right: 0; bottom: 0;
    padding: 3px 6px;
    background: linear-gradient(transparent, rgba(0, 0, 0, .55));
    color: #fff;
    font-size: 10px;
    line-height: 1.3;
    pointer-events: none;
}
.pool-image .image-info span {
    display: block;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.pool-image .remove-btn {
    position: absolute;
    top: 4px; right: 4px;
    width: 22px; height: 22px;
    border: none;
    border-radius: 50%;
    background: rgba(0, 0, 0, .45);
    color: #fff;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
    -webkit-tap-highlight-color: transparent;
}
.pool-image .remove-btn svg { width: 12px; height: 12px; }
.pool-image .remove-btn:hover { background: var(--primary-strong); }

/* 分组卡片 */
.groups { display: flex; flex-direction: column; gap: 10px; min-height: 120px; }
.group-box {
    background: var(--surface);
    border: 1px solid var(--hairline);
    border-radius: var(--r-card);
    padding: 10px 12px;
    transition: border-color var(--dur) ease-out;
}
.group-head { display: flex; align-items: center; gap: 8px; }
.group-title { font-size: 14px; font-weight: 700; }
.badge { font-size: 11px; background: var(--primary-soft); color: var(--primary); border-radius: 999px; padding: 2px 9px; }
.group-head .spacer { flex: 1; }
.mini-preview {
    height: 48px;
    width: 40px;
    border-radius: 6px;
    background: var(--surface-2);
    border: 1px solid var(--hairline);
    cursor: zoom-in;
    flex-shrink: 0;
}
.group-images {
    display: flex;
    flex-direction: column;
    gap: 6px;
    margin-top: 8px;
    overflow: hidden;
    max-height: 1200px;
    transition: max-height .25s ease-out, opacity .2s ease-out, margin-top .25s ease-out;
    position: relative;
}
.group-box.collapsed .group-images { max-height: 0; opacity: 0; margin-top: 0; }
.group-box.collapsed .collapse-toggle svg { transform: rotate(-90deg); }
.collapse-toggle svg { transition: transform var(--dur) ease-out; }

/* 组内磁贴行 */
.group-image {
    display: flex;
    align-items: center;
    gap: 9px;
    background: var(--surface);
    border: 1px solid var(--hairline);
    border-radius: var(--r-tile);
    padding: 6px 8px;
    cursor: grab;
    transition: transform var(--dur) ease-out, box-shadow var(--dur) ease-out, opacity var(--dur) ease-out;
    -webkit-tap-highlight-color: transparent;
    -webkit-touch-callout: none;
    user-select: none;
    -webkit-user-select: none;
    will-change: transform;
}
.group-image:hover { box-shadow: var(--shadow); }
.group-image img {
    width: 44px;
    height: 44px;
    border-radius: 8px;
    object-fit: cover;
    pointer-events: none;
    flex-shrink: 0;
    display: block;
    background: var(--hairline);
}
.group-image .grip { color: var(--text-2); opacity: .6; flex-shrink: 0; display: flex; }
.group-image .grip svg { width: 14px; height: 14px; }
.group-image .meta { flex: 1; min-width: 0; }
.group-image .filename {
    display: block;
    font-size: 13px;
    color: var(--text);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    line-height: 1.4;
}
.group-image small { font-size: 11px; color: var(--text-2); }
.group-image .remove-btn {
    width: 28px; height: 28px;
    border: none;
    border-radius: 8px;
    background: transparent;
    color: var(--text-2);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    padding: 0;
    -webkit-tap-highlight-color: transparent;
}
.group-image .remove-btn:hover { color: var(--primary); background: var(--primary-soft); }
.group-image .remove-btn svg { width: 14px; height: 14px; }

/* 拖拽状态（类名为测试与逻辑钩子，不可改名） */
.dragging {
    opacity: .55;
    transform: scale(1.04) rotate(2deg);
    box-shadow: 0 8px 24px rgba(0, 0, 0, .22);
    cursor: grabbing;
    z-index: 1000;
}
.drag-over {
    outline: 2px dashed var(--primary);
    outline-offset: 3px;
    border-radius: var(--r-small);
}

/* 底部栏：桌面为普通流，移动端固定 */
.bottom-bar {
    display: flex;
    gap: 10px;
    align-items: center;
    justify-content: flex-end;
    padding: 14px 4px 0;
}
.bottom-bar #stitchBtn { min-width: 140px; }
.progress-wrap { flex: 1; min-width: 0; }
.progress-bar {
    height: 5px;
    border-radius: 3px;
    background: var(--hairline);
    overflow: hidden;
}
.progress-fill {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--primary), #FFB347);
    transition: width .3s ease-out;
}
#progressText { font-size: 12px; color: var(--text-2); margin-top: 4px; }
#paramsToggle { display: none; }

/* 移动端 */
@media (max-width: 959px) {
    body { padding: 12px 12px 80px; }
    .app { margin: 0 auto; }
    .workspace { grid-template-columns: 1fr; }
    .pool-tiles { display: flex; overflow-x: auto; padding-bottom: 4px; }
    .pool-tiles .pool-image { width: 72px; flex: none; }
    #paramsToggle { display: inline-flex; }
    .params-row {
        position: fixed;
        left: 0; right: 0;
        bottom: 72px;
        z-index: 40;
        margin: 0 12px;
        flex-direction: column;
        align-items: stretch;
        box-shadow: 0 -4px 20px rgba(0, 0, 0, .18);
        transform: translateY(130%);
        opacity: 0;
        pointer-events: none;
        transition: transform .25s ease-out, opacity .25s ease-out;
    }
    .params-row.open { transform: translateY(0); opacity: 1; pointer-events: auto; }
    .field-quality { margin-left: 0; }
    .bottom-bar {
        position: fixed;
        left: 0; right: 0; bottom: 0;
        z-index: 50;
        background: var(--surface);
        padding: 10px 14px calc(10px + env(safe-area-inset-bottom));
        box-shadow: 0 -3px 14px rgba(0, 0, 0, .12);
    }
    .bottom-bar #stitchBtn { flex: 1; min-width: 0; }
}

/* 浮层共用 */
.preview-overlay, .result-overlay {
    position: fixed;
    inset: 0;
    z-index: 100;
    background: rgba(30, 20, 14, .55);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 18px;
}
.preview-shell, .result-card {
    background: var(--surface);
    border-radius: var(--r-card);
    box-shadow: var(--shadow);
    animation: rise .25s ease-out;
    max-height: 90vh;
    display: flex;
    flex-direction: column;
}
@keyframes rise {
    from { transform: translateY(18px); opacity: 0; }
}

/* 全屏预览浮层 */
.preview-shell { width: min(560px, 94vw); }
.preview-head {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 12px;
    border-bottom: 1px solid var(--hairline);
}
.preview-meta { flex: 1; font-size: 13px; font-weight: 700; display: flex; gap: 10px; align-items: baseline; min-width: 0; }
.preview-dims { font-size: 11px; font-weight: 400; color: var(--text-2); }
.preview-scroll { overflow: auto; padding: 12px; max-height: calc(90vh - 54px); }
.preview-scroll canvas { width: 100%; border-radius: 8px; display: block; }

/* 结果卡片 */
.result-card { width: min(430px, 94vw); padding: 16px; gap: 10px; }
.result-card h3 { font-size: 16px; }
.result-list { overflow: auto; display: flex; flex-direction: column; gap: 8px; }
.result-item {
    display: flex;
    gap: 10px;
    align-items: center;
    background: var(--surface-2);
    border-radius: 10px;
    padding: 8px;
}
.result-item canvas { width: 40px; border-radius: 6px; background: #fff; flex-shrink: 0; }
.result-item .ri-meta { flex: 1; min-width: 0; font-size: 12px; color: var(--text-2); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.result-actions { display: flex; justify-content: flex-end; gap: 8px; padding-top: 6px; }

/* 动效降级 */
@media (prefers-reduced-motion: reduce) {
    * { transition-duration: .01ms !important; animation-duration: .01ms !important; }
    body::before { animation: none; }
}