* {
    box-sizing: border-box;
}

:root {
    color-scheme: light dark;

    /* ===== 默认：浅色主题 ===== */
    --page-bg: #f9fafb;
    --page-text: #111827;

    --compare-bg: #ffffff;
    --compare-border: #d1d5db;
    --compare-shadow: 0 10px 30px rgba(15, 23, 42, 0.12);

    --pane-bg: #f9fafb;
    --pane-border: #e5e7eb;

    --select-bg: #ffffff;
    --select-border: #d1d5db;
    --select-text: #111827;

    --label-bg: rgba(15, 23, 42, 0.85);
    --label-border: rgba(55, 65, 81, 0.9);

    --footer-text: #6b7280;
}

/* ===== 深色主题：覆盖变量 ===== */
@media (prefers-color-scheme: dark) {
    :root {
        --page-bg: #111827;
        --page-text: #e5e7eb;

        --compare-bg: #020617;
        --compare-border: #1f2937;
        --compare-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);

        --pane-bg: #020617;
        --pane-border: #1f2937;

        --select-bg: #020617;
        --select-border: #374151;
        --select-text: #e5e7eb;

        --footer-text: #6b7280;
    }
}

body {
    margin: 0;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    background: var(--page-bg);
    color: var(--page-text);
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding: 16px;
}

/* 整个组件外层容器 */
.compare-root {
    width: 100%;
    max-width: 1100px;
    border-radius: 12px;
    background: var(--compare-bg);
    border: 1px solid var(--compare-border);
    box-shadow: var(--compare-shadow);
    padding: 16px 16px 20px;
    margin-bottom: 16px;
    /* 多个组件时稍微有点间距 */
}

.compare-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
    gap: 12px;
}

.compare-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--page-text);
}

.compare-groups {
    display: flex;
    justify-content: flex-end;
}

.compare-groups select {
    border-radius: 999px;
    border: 1px solid var(--select-border);
    background: var(--select-bg);
    padding: 4px 10px;
    font-size: 13px;
    color: var(--select-text);
    cursor: pointer;
    outline: none;
}

.compare-main {
    display: flex;
    gap: 8px;
    height: 420px;
    margin-top: 4px;
}

.compare-pane {
    flex: 1;
    position: relative;
    border-radius: 10px;
    overflow: hidden;
    background: var(--pane-bg);
    border: 1px solid var(--pane-border);
    cursor: grab;
    user-select: none;
    touch-action: none;
}

.compare-pane:active {
    cursor: grabbing;
}

.compare-pane-label {
    position: absolute;
    top: 8px;
    left: 8px;
    padding: 2px 8px;
    border-radius: 999px;
    background: var(--label-bg);
    border: 1px solid var(--label-border);
    font-size: 11px;
    color: #e5e7eb;
    z-index: 3;
    pointer-events: none;
}

.compare-pane img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    transform-origin: center center;
    transform: translate(0px, 0px) scale(1);
    will-change: transform;
    pointer-events: none;
}

/* 加载遮罩 & 动画 */
.compare-loading {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(1px);
    background: rgba(15, 23, 42, 0.25);
    z-index: 2;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.18s ease-out;
}

.compare-loading.visible {
    opacity: 1;
    pointer-events: auto;
}

.compare-loading-inner {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    font-size: 11px;
    color: #e5e7eb;
}

.compare-spinner {
    width: 22px;
    height: 22px;
    border-radius: 999px;
    border: 2px solid rgba(243, 244, 246, 0.3);
    border-top-color: #e5e7eb;
    animation: compare-spin 0.7s linear infinite;
}

@keyframes compare-spin {
    to {
        transform: rotate(360deg);
    }
}

.compare-footer {
    margin-top: 8px;
    font-size: 12px;
    color: var(--footer-text);
    display: flex;
    justify-content: space-between;
    gap: 8px;
    flex-wrap: wrap;
}

.compare-footer span {
    white-space: nowrap;
}

@media (max-width: 768px) {
    .compare-main {
        flex-direction: column;
        height: 360px;
    }
}