/**
 * 智能抠图工具 - 样式文件
 * 设计风格：现代、专业、简洁
 */

/* ==================== CSS变量定义 ==================== */
:root {
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --primary-light: #818cf8;
    --secondary-color: #64748b;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --bg-hover: #475569;
    
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    
    --border-color: #334155;
    --border-light: #475569;
    
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 350ms ease;
    
    --font-sans: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-display: 'Space Grotesk', 'Noto Sans SC', sans-serif;
}

/* ==================== 全局重置 ==================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html, body {
    height: 100%;
    overflow: hidden;
}

body {
    font-family: var(--font-sans);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ==================== 应用容器 ==================== */
.app-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
    background: linear-gradient(135deg, var(--bg-primary) 0%, #1a1f2e 100%);
}

/* ==================== 顶部导航栏 ==================== */
.header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
    height: 64px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow-md);
    z-index: 100;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-icon {
    width: 32px;
    height: 32px;
    color: var(--primary-color);
}

.logo-text {
    font-family: var(--font-display);
    font-size: 20px;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.header-actions {
    display: flex;
    gap: 12px;
}

/* 顶部导航链接 */
.header-nav {
    display: flex;
    gap: 24px;
    align-items: center;
}

.header-nav .nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    padding: 6px 12px;
    border-radius: var(--radius-md);
    transition: color var(--transition-fast), background var(--transition-fast);
}

.header-nav .nav-link:hover {
    color: var(--text-primary);
    background: var(--bg-tertiary);
}

/* ==================== 语言切换器 ==================== */
.lang-switcher {
    position: relative;
}

.lang-switcher-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: color var(--transition-fast), background var(--transition-fast), border-color var(--transition-fast);
}

.lang-switcher-btn:hover {
    color: var(--text-primary);
    background: var(--bg-tertiary);
    border-color: var(--border-light);
}

.lang-switcher-btn svg {
    flex-shrink: 0;
}

.lang-dropdown {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    min-width: 120px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-4px);
    transition: opacity var(--transition-fast), visibility var(--transition-fast), transform var(--transition-fast);
    z-index: 200;
    overflow: hidden;
}

.lang-dropdown.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.lang-option {
    display: block;
    width: 100%;
    padding: 10px 16px;
    font-size: 14px;
    color: var(--text-secondary);
    background: transparent;
    border: none;
    cursor: pointer;
    text-align: left;
    transition: color var(--transition-fast), background var(--transition-fast);
}

.lang-option:hover {
    color: var(--text-primary);
    background: var(--bg-tertiary);
}

.lang-option.active {
    color: var(--primary-color);
    font-weight: 600;
}

@media (max-width: 768px) {
    .header-nav {
        display: none;
    }
}

/* ==================== 按钮样式 ==================== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    font-size: 14px;
    font-weight: 500;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: var(--font-sans);
}

.btn svg {
    width: 18px;
    height: 18px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-hover) 100%);
    color: white;
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(99, 102, 241, 0.4);
}

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

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

.btn-secondary:hover:not(:disabled) {
    background: var(--bg-hover);
    border-color: var(--border-light);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-large {
    padding: 14px 32px;
    font-size: 16px;
}

.btn-full {
    width: 100%;
    justify-content: center;
    margin-top: 7px;
    margin-bottom: 7px;
}

/* ==================== 主要内容区域 ==================== */
.main-content {
    display: flex;
    flex: 1;
    overflow: hidden;
}

/* ==================== 左侧工具栏 ==================== */
.toolbar {
    width: 280px;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    overflow-y: auto;
    padding: 20px;
}

.tool-section {
    margin-bottom: 24px;
}

.tool-section-title {
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    margin: 12px;
}

.tool-buttons {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.tool-btn {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: var(--font-sans);
    font-size: 14px;
    text-align: left;
}

.tool-btn svg {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

.tool-btn:hover {
    background: var(--bg-hover);
    border-color: var(--border-light);
    color: var(--text-primary);
}

.tool-btn.active {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-hover) 100%);
    border-color: var(--primary-color);
    color: white;
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

/* ==================== 工具参数 ==================== */
.tool-params {
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    padding: 16px;
}

.param-group {
    display: none;
}

.param-group.active {
    display: block;
}

.param-group[data-tool="postProcess"] {
    display: block;
}

.param-item {
    margin-bottom: 16px;
}

.section-divider {
    display: flex;
    align-items: center;
    gap: 12px;
    margin: 16px 0;
    width: 100%;
}

.section-divider::before,
.section-divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background-color: #475569;
    min-width: 20px;
}

.divider-text {
    font-size: 12px;
    color: var(--text-secondary);
    white-space: nowrap;
    font-weight: 500;
}

.param-item:last-child {
    margin-bottom: 0;
}

.param-item label {
    display: block;
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 8px;
    margin-top: 8px;
}

.param-item input[type="range"] {
    width: calc(100% - 50px);
    height: 6px;
    background: var(--bg-secondary);
    border-radius: 3px;
    outline: none;
    -webkit-appearance: none;
    appearance: none;
}

.param-item input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    background: var(--primary-color);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 2px 6px rgba(99, 102, 241, 0.3);
    transition: transform var(--transition-fast);
}

.param-item input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.1);
}

.param-value {
    display: inline-block;
    width: 40px;
    text-align: right;
    font-size: 13px;
    color: var(--text-primary);
    font-weight: 500;
}

.param-item input[type="checkbox"] {
    margin-right: 8px;
    cursor: pointer;
}

.param-select {
    width: 100%;
    padding: 8px 12px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 13px;
    font-family: var(--font-sans);
    cursor: pointer;
    outline: none;
    transition: all var(--transition-fast);
}

.param-select:hover {
    border-color: var(--border-light);
}

/* ==================== 画笔模式按钮 ==================== */
.brush-mode-buttons {
    display: flex;
    gap: 8px;
    width: 100%;
}

.mode-btn {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 12px 8px;
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: 12px;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.mode-btn svg {
    width: 24px;
    height: 24px;
    margin-bottom: 4px;
}

.mode-btn:hover {
    border-color: var(--border-light);
    background: var(--bg-tertiary);
}

.mode-btn.active {
    border-color: var(--primary-color);
    background: rgba(99, 102, 241, 0.1);
    color: var(--primary-color);
}

.mode-btn.active svg {
    color: var(--primary-color);
}

#brushSubtractMode.active {
    border-color: #EF4444;
    background: rgba(239, 68, 68, 0.1);
    color: #EF4444;
}

.shape-buttons {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
    width: 100%;
}

.shape-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 12px 8px;
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.shape-btn svg {
    width: 24px;
    height: 24px;
}

.shape-btn:hover {
    border-color: var(--border-light);
    background: var(--bg-tertiary);
}

.shape-btn.active {
    border-color: var(--primary-color);
    background: rgba(99, 102, 241, 0.1);
    color: var(--primary-color);
}

.shape-btn.active svg {
    color: var(--primary-color);
}

.shape-hint {
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    padding: 12px;
    margin-top: 8px;
}

.shape-hint p {
    margin: 4px 0;
    font-size: 12px;
    color: var(--text-secondary);
}

#brushSubtractMode.active svg {
    color: #EF4444;
}

/* ==================== 画笔提示 ==================== */
.brush-hint {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 12px;
    margin-top: 8px;
}

.brush-hint p {
    font-size: 12px;
    color: var(--text-secondary);
    margin: 4px 0;
    line-height: 1.5;
}

.brush-hint p strong {
    color: var(--text-primary);
}

.param-select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(99, 102, 241, 0.2);
}

.param-select option {
    background: var(--bg-secondary);
    color: var(--text-primary);
    padding: 8px;
}

/* ==================== 画布区域 ==================== */
.canvas-area {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    overflow: hidden;
    position: relative;
    background: 
        linear-gradient(45deg, #1a1f2e 25%, transparent 25%),
        linear-gradient(-45deg, #1a1f2e 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, #1a1f2e 75%),
        linear-gradient(-45deg, transparent 75%, #1a1f2e 75%);
    background-size: 20px 20px;
    background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
    background-color: var(--bg-primary);
}

/* ==================== 缩放控制 ==================== */
.zoom-controls {
    position: absolute;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    align-items: center;
    gap: 8px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 8px 12px;
    box-shadow: var(--shadow-lg);
    z-index: 10;
}

.zoom-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.zoom-btn svg {
    width: 18px;
    height: 18px;
}

.zoom-btn:hover {
    background: var(--bg-hover);
    border-color: var(--border-light);
}

.zoom-btn:active {
    transform: scale(0.95);
}

.zoom-level {
    min-width: 50px;
    text-align: center;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-primary);
    user-select: none;
}

.canvas-wrapper {
    position: relative;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

#mainCanvas, #overlayCanvas {
    display: block;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    transform-origin: center center;
}

#overlayCanvas {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    cursor: crosshair;
    pointer-events: auto;
}

#mainCanvas {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

#mainCanvas.hidden,
#overlayCanvas.hidden {
    display: none;
}

/* ==================== 上传提示 ==================== */
.upload-prompt {
    text-align: center;
    padding: 60px;
}

.upload-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 24px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    animation: float 3s ease-in-out infinite;
}

.upload-icon svg {
    width: 40px;
    height: 40px;
    color: white;
}

@keyframes float {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-10px);
    }
}

.upload-prompt h2 {
    font-family: var(--font-display);
    font-size: 24px;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.upload-prompt p {
    color: var(--text-secondary);
    margin-bottom: 24px;
}

/* ==================== 右侧信息面板 ==================== */
.info-panel {
    width: 280px;
    background: var(--bg-secondary);
    border-left: 1px solid var(--border-color);
    overflow-y: auto;
    padding: 20px;
}

.panel-section {
    margin-bottom: 24px;
}

.panel-title {
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    margin-bottom: 12px;
}

.info-item {
    display: flex;
    justify-content: space-between;
    padding: 8px 0;
    border-bottom: 1px solid var(--border-color);
}

.info-label {
    color: var(--text-secondary);
    font-size: 13px;
}

.info-value {
    color: var(--text-primary);
    font-size: 13px;
    font-weight: 500;
}

/* ==================== 使用说明 ==================== */
.instructions {
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    padding: 16px;
}

.instruction-item {
    display: flex;
    gap: 12px;
    margin-bottom: 12px;
}

.instruction-item:last-child {
    margin-bottom: 0;
}

.instruction-number {
    width: 24px;
    height: 24px;
    background: var(--primary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    font-weight: 600;
    color: white;
    flex-shrink: 0;
}

.instruction-item p {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* ==================== 快捷键 ==================== */
.shortcuts {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.shortcut-item {
    display: flex;
    align-items: center;
    gap: 12px;
}

kbd {
    display: inline-block;
    padding: 4px 8px;
    font-size: 12px;
    font-family: var(--font-sans);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-weight: 500;
    min-width: 60px;
    text-align: center;
}

.shortcut-item span {
    font-size: 13px;
    color: var(--text-secondary);
}

/* ==================== 页脚样式 ==================== */
.app-footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 16px 24px;
    flex-shrink: 0;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1400px;
    margin: 0 auto;
}

.footer-links {
    display: flex;
    gap: 20px;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 13px;
    transition: color var(--transition-fast);
}

.footer-links a:hover {
    color: var(--primary-color);
}

.footer-copyright {
    font-size: 12px;
    color: var(--text-muted);
}

@media (max-width: 768px) {
    .footer-content {
        flex-direction: column;
        gap: 12px;
        text-align: center;
    }
}

/* ==================== 加载提示 ==================== */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(15, 23, 42, 0.9);
    display: none;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: 20px;
    z-index: 1000;
}

.loading-overlay.active {
    display: flex;
}

.loading-spinner {
    width: 50px;
    height: 50px;
    border: 4px solid var(--bg-tertiary);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

.loading-text {
    font-size: 16px;
    color: var(--text-primary);
    font-weight: 500;
}

/* ==================== 滚动条样式 ==================== */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
    background: var(--bg-tertiary);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--bg-hover);
}

/* ==================== 选区样式 ==================== */
.selection-active {
    cursor: crosshair !important;
}

/* ==================== 响应式设计 ==================== */
@media (max-width: 1200px) {
    .toolbar, .info-panel {
        width: 240px;
    }
}

@media (max-width: 900px) {
    .info-panel {
        display: none;
    }
}

@media (max-width: 600px) {
    .toolbar {
        display: none;
    }
    
    .header {
        padding: 0 16px;
    }
    
    .logo-text {
        display: none;
    }
}

/* ==================== 通知动画 ==================== */
@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

@keyframes slideOut {
    from {
        transform: translateX(0);
        opacity: 1;
    }
    to {
        transform: translateX(100%);
        opacity: 0;
    }
}

.notification {
    font-family: var(--font-sans);
    user-select: none;
    pointer-events: none;
}