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

/* 改进：使用 CSS 变量提高可维护性和主题切换能力 */
:root {
    --primary-color: #0066ff;
    --primary-hover: #0052cc;
    --border-color: #d0d0d0;
    --text-color: #333;
    --bg-color: #fff;
    --bg-light: #f5f5f5;
    --bg-lighter: #f9f9f9;
    --text-secondary: #999;
    --error-color: #ff4444;
    --success-color: #44aa44;
    --info-color: #4488ff;
    --border-radius: 12px;
    --gap-size: 16px;
    --padding-size: 24px;
}

body {
    font-family: system-ui, -apple-system, sans-serif;
    background-color: var(--bg-light);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px 80px;
    min-height: 100vh;
}

.wrapper {
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.page-title {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 24px;
    color: var(--text-color);
    align-self: flex-start;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

.container {
    display: flex;
    height: calc(100vh - 40px);
    gap: var(--gap-size);
    max-width: 1600px;
    width: 100%;
    background-color: var(--bg-light);
}

/* 左侧控制面板 */
.control-panel {
    width: 47.6%;
    background-color: var(--bg-color);
    overflow-y: auto;
    padding: var(--padding-size);
    border-radius: var(--border-radius);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.control-panel h2 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--text-color);
}

.section {
    margin-bottom: 24px;
}

.section:last-child {
    margin-bottom: 0;
}

/* 上传按钮 */
.upload-button-wrapper {
    display: flex;
    justify-content: center;
}

.btn-select {
    display: inline-block;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 6px;
    padding: 10px 20px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.2s;
}

.btn-select:hover {
    background-color: var(--primary-hover);
}

.file-status {
    font-size: 12px;
    color: var(--text-secondary);
    margin-top: 8px;
}

/* 表单 */
.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-bottom: 16px;
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group label {
    font-size: 13px;
    font-weight: 500;
    margin-bottom: 6px;
    color: var(--text-color);
}

.form-group input[type="number"],
.form-group input[type="color"],
.form-group select {
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 13px;
    font-family: inherit;
}

.form-group input[type="color"] {
    padding: 4px;
    height: 40px;
    cursor: pointer;
}

.form-group input[type="number"],
.form-group select {
    background-color: var(--bg-color);
}

/* 改进：保留焦点指示以提升可访问性，使用 outline 而不是移除它 */
.form-group input[type="number"]:focus,
.form-group input[type="color"]:focus,
.form-group select:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

.input-group {
    display: flex;
    align-items: center;
    gap: 8px;
}

.input-group input {
    flex: 1;
}

.unit {
    font-size: 12px;
    color: var(--text-secondary);
}

/* 文本框 */
textarea {
    width: 100%;
    height: 120px;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 13px;
    font-family: inherit;
    resize: vertical;
}

textarea:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* 按钮组 */
.button-group {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.btn-primary,
.btn-secondary,
.btn-download {
    padding: 12px 20px;
    border: none;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
}

.btn-primary:hover:not(:disabled) {
    background-color: var(--primary-hover);
}

.btn-secondary {
    background-color: var(--bg-light);
    color: var(--text-color);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover:not(:disabled) {
    background-color: #e8e8e8;
}

.btn-download {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    font-weight: 600;
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
}

.btn-download:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(102, 126, 234, 0.6);
}

.btn-download:active:not(:disabled) {
    transform: translateY(0);
}

.btn-download span {
    font-size: 16px;
}

.btn-primary:disabled,
.btn-secondary:disabled,
.btn-download:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* 右侧预览区域 */
.preview-panel {
    width: 52.4%;
    background-color: var(--bg-color);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    border-radius: var(--border-radius);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.fullscreen-hint {
    position: absolute;
    top: 16px;
    right: 16px;
    background-color: #333;
    color: white;
    padding: 8px 12px;
    border-radius: 4px;
    font-size: 12px;
    opacity: 0;
    transition: opacity 0.3s;
    pointer-events: none;
    z-index: 10;
}

.fullscreen-hint span {
    background-color: #555;
    padding: 2px 6px;
    border-radius: 2px;
    margin: 0 4px;
}

.preview-panel:fullscreen .fullscreen-hint {
    opacity: 1;
}

#canvas {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    cursor: pointer;
}

.placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 16px;
    color: var(--text-secondary);
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    padding: 0 80px;
    box-sizing: border-box;
}

.placeholder svg {
    opacity: 0.3;
}

.placeholder p {
    font-size: 14px;
}

/* 全屏模式 */
.preview-panel:fullscreen {
    background-color: #000;
}

.preview-panel:fullscreen #canvas {
    max-width: 100vw;
    max-height: 100vh;
}

/* 改进：添加 toast 通知样式 */
.toast-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 9999;
    pointer-events: none;
}

.toast {
    background-color: #333;
    color: white;
    padding: 12px 20px;
    border-radius: 6px;
    margin-bottom: 10px;
    font-size: 14px;
    opacity: 0;
    transform: translateX(400px);
    transition: all 0.3s ease;
    pointer-events: auto;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.toast.show {
    opacity: 1;
    transform: translateX(0);
}

.toast-success {
    background-color: var(--success-color);
}

.toast-error {
    background-color: var(--error-color);
}

.toast-info {
    background-color: var(--info-color);
}

/* 改进：添加 prefers-reduced-motion 支持，尊重用户的动画偏好 */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* 响应式设计 */
@media (max-width: 1024px) {
    .container {
        flex-direction: column;
        height: auto;
        gap: var(--gap-size);
    }

    .control-panel {
        width: 100%;
        max-height: 50vh;
    }

    .preview-panel {
        width: 100%;
        height: 50vh;
    }
}

@media (max-width: 768px) {
    :root {
        --padding-size: 16px;
    }

    .control-panel {
        padding: var(--padding-size);
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .button-group {
        grid-template-columns: 1fr;
    }

    .toast-container {
        top: 10px;
        right: 10px;
        left: 10px;
    }

    .toast {
        transform: translateX(0);
        opacity: 0;
    }

    .toast.show {
        opacity: 1;
    }
}