/* ===== 工具页面专属样式 ===== */

/* ── 上传区域 ── */
.split-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    backdrop-filter: blur(18px);
    box-shadow: 0 18px 42px var(--shadow);
    overflow: hidden;
}

.upload-area {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    padding: 4rem 2rem;
    cursor: pointer;
    transition: background 180ms ease, border-color 180ms ease;
    border: 2px dashed var(--border);
    border-radius: 12px;
    background: color-mix(in srgb, var(--accent) 3%, transparent);
    min-height: 260px;
}

.upload-area:hover {
    background: color-mix(in srgb, var(--accent) 8%, transparent);
    border-color: var(--accent);
}

.upload-area.drag-over {
    background: color-mix(in srgb, var(--accent) 14%, transparent);
    border-color: var(--accent-hover);
    border-style: solid;
}

.upload-icon {
    color: var(--text-muted);
    opacity: 0.6;
}

.upload-area:hover .upload-icon {
    color: var(--accent);
    opacity: 0.8;
}

.upload-text {
    margin: 0;
    font-size: 1.1rem;
    font-weight: 600;
}

.upload-hint {
    margin: 0;
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* ── 双栏布局 ── */
.split-layout {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 1.25rem;
    align-items: start;
}

.split-layout.is-hidden {
    display: none;
}

@media (max-width: 820px) {
    .split-layout {
        grid-template-columns: 1fr;
    }
}

/* ── 左侧设置面板 ── */
.split-settings {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1.25rem;
    backdrop-filter: blur(18px);
    box-shadow: 0 18px 42px var(--shadow);
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.settings-title {
    margin: 0;
    font-size: 1rem;
    font-weight: 700;
}

.field-row {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 0.5rem;
    align-items: center;
}

.field-label {
    font-size: 0.92rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text);
    white-space: nowrap;
}

.field-label output {
    font-weight: 700;
    color: var(--accent);
    min-width: 2ch;
    text-align: right;
}

/* ── 范围滑块 ── */
.range-slider {
    grid-column: 1 / -1;
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 6px;
    border-radius: 3px;
    background: color-mix(in srgb, var(--accent) 25%, var(--border));
    outline: none;
    transition: background 180ms ease;
    cursor: pointer;
}

.range-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--accent);
    border: 2px solid var(--bg);
    box-shadow: 0 2px 8px rgba(0,0,0,0.3);
    cursor: pointer;
    transition: transform 120ms ease;
}

.range-slider::-webkit-slider-thumb:hover {
    transform: scale(1.15);
}

.range-slider::-moz-range-thumb {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--accent);
    border: 2px solid var(--bg);
    box-shadow: 0 2px 8px rgba(0,0,0,0.3);
    cursor: pointer;
}

/* ── 颜色选择器 ── */
.color-picker-row {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    grid-column: 1 / -1;
}

.color-input {
    -webkit-appearance: none;
    appearance: none;
    width: 36px;
    height: 36px;
    border: 2px solid var(--border);
    border-radius: 8px;
    cursor: pointer;
    background: none;
    padding: 2px;
}

.color-input::-webkit-color-swatch-wrapper {
    padding: 0;
}

.color-input::-webkit-color-swatch {
    border: none;
    border-radius: 5px;
}

.color-input::-moz-color-swatch {
    border: none;
    border-radius: 5px;
}

/* ── 输出格式单选 ── */
.format-row {
    display: flex;
    gap: 0.5rem;
    grid-column: 1 / -1;
}

.radio-chip {
    flex: 1;
    text-align: center;
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 150ms ease;
    background: transparent;
    color: var(--text-muted);
}

.radio-chip input {
    display: none;
}

.radio-chip[data-checked] {
    border-color: var(--accent);
    background: color-mix(in srgb, var(--accent) 15%, transparent);
    color: var(--accent);
}

.radio-chip:hover {
    border-color: var(--accent-hover);
}

/* ── 开关 ── */
.switch {
    position: relative;
    display: inline-block;
    width: 40px;
    height: 22px;
    cursor: pointer;
    justify-self: end;
}

.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.switch-track {
    position: absolute;
    inset: 0;
    border-radius: 22px;
    background: color-mix(in srgb, var(--accent) 20%, var(--border));
    transition: background 180ms ease;
}

.switch-track::after {
    content: "";
    position: absolute;
    top: 3px;
    left: 3px;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--text);
    transition: transform 180ms ease, background 180ms ease;
}

.switch input:checked + .switch-track {
    background: var(--accent);
}

.switch input:checked + .switch-track::after {
    transform: translateX(18px);
    background: white;
}

/* ── 信息徽章 ── */
.info-badge {
    padding: 0.35rem 0.75rem;
    border-radius: 6px;
    background: color-mix(in srgb, var(--accent) 12%, transparent);
    border: 1px solid color-mix(in srgb, var(--accent) 30%, transparent);
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--accent);
    text-align: center;
}

/* ── 下载按钮 ── */
.download-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    width: 100%;
    padding: 0.85rem 1.25rem;
    border: none;
    border-radius: 10px;
    background: var(--accent);
    color: white;
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 180ms ease;
    box-shadow: 0 4px 16px color-mix(in srgb, var(--accent) 40%, transparent);
}

.download-btn:hover:not(:disabled) {
    background: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 8px 28px color-mix(in srgb, var(--accent) 50%, transparent);
}

.download-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    transform: none;
}

.download-btn:focus-visible {
    outline: 3px solid color-mix(in srgb, var(--accent) 68%, white);
    outline-offset: 4px;
}

.download-hint {
    margin: -0.5rem 0 0;
    font-size: 0.78rem;
    color: var(--text-muted);
    text-align: center;
}

/* ── 右侧预览 ── */
.split-preview {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    backdrop-filter: blur(18px);
    box-shadow: 0 18px 42px var(--shadow);
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.preview-container {
    flex: 1;
    min-height: 400px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: auto;
    padding: 1rem;
    background:
        repeating-conic-gradient(var(--bg-soft) 0% 25%, transparent 0% 50%) 0 0 / 20px 20px;
}

.preview-container canvas {
    max-width: 100%;
    height: auto;
    display: block;
}

.preview-info {
    margin: 0;
    padding: 0.75rem 1rem;
    font-size: 0.82rem;
    color: var(--text-muted);
    text-align: center;
    border-top: 1px solid var(--border);
}

/* ── 加载遮罩 ── */
.loading-overlay {
    position: fixed;
    inset: 0;
    z-index: 999;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    background: color-mix(in srgb, var(--bg) 85%, transparent);
    backdrop-filter: blur(8px);
}

.loading-overlay.is-hidden {
    display: none;
}

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

.loading-overlay p {
    margin: 0;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text);
}