* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
}

:root {
    --primary-color: #0066CC;
    --primary-light: #0071e3;
    --text-color: #1d1d1f;
    --text-secondary: #86868b;
    --background-color: #f5f5f7;
    --card-bg: #ffffff;
    --border-radius: 14px;
    --spacing: 28px;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s cubic-bezier(0.42, 0, 0.58, 1);
}

body {
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.5;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 3rem 2rem;
    width: 100%;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

header {
    text-align: center;
    margin-bottom: 3rem;
    animation: fadeIn 0.8s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes slideIn {
    from { opacity: 0; transform: translateX(-10px); }
    to { opacity: 1; transform: translateX(0); }
}

header h1 {
    font-weight: 600;
    font-size: 3rem;
    letter-spacing: -0.5px;
    color: var(--text-color);
    background: linear-gradient(90deg, #0066CC, #5AC8FA);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 0.5rem;
}

.tagline {
    font-size: 1.1rem;
    color: var(--text-secondary);
    font-weight: 400;
    opacity: 0.8;
    margin-top: 0.5rem;
}

.drag-hint {
    font-size: 0.9rem;
    color: var(--primary-color);
    font-weight: 500;
    margin-top: 0.5rem;
    opacity: 0.8;
}

.drag-hint i {
    margin-right: 6px;
}

main {
    display: flex;
    flex-direction: column;
    gap: var(--spacing);
    flex-grow: 1;
    animation: fadeIn 0.8s ease-out 0.2s backwards;
}

@media (min-width: 768px) {
    main {
        flex-direction: row;
        align-items: stretch;
    }
}

.controls {
    background-color: var(--card-bg);
    padding: var(--spacing);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    width: 100%;
    position: relative;
    overflow: hidden;
    z-index: 1;
    transition: var(--transition);
}

.controls::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 6px;
    background: linear-gradient(90deg, #0066CC, #5AC8FA);
    z-index: 2;
}

.controls:hover {
    box-shadow: var(--shadow-md), 0 10px 30px rgba(0, 102, 204, 0.1);
    transform: translateY(-2px);
}

@media (min-width: 768px) {
    .controls {
        width: 320px;
        flex-shrink: 0;
    }
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
    animation: slideIn 0.5s ease;
    animation-fill-mode: both;
}

.control-group:nth-child(1) { animation-delay: 0.1s; }
.control-group:nth-child(2) { animation-delay: 0.2s; }
.control-group:nth-child(3) { animation-delay: 0.3s; }
.control-group:nth-child(4) { animation-delay: 0.4s; }

label {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-left: 2px;
}

input, select {
    padding: 12px 16px;
    border-radius: 10px;
    border: 1px solid #e2e2e7;
    font-size: 1rem;
    background-color: #fff;
    transition: var(--transition);
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.04);
}

input:hover, select:hover {
    border-color: #b2b2b7;
}

input:focus, select:focus {
    border-color: var(--primary-color);
    outline: none;
    box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.15);
}

input[type="color"] {
    height: 52px;
    cursor: pointer;
    padding: 4px;
}

/* 颜色信息显示 */
.color-info {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: 8px;
}

#color-code {
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.9rem;
    color: var(--text-secondary);
    background: #f8f9fa;
    padding: 4px 8px;
    border-radius: 4px;
    border: 1px solid #e9ecef;
    flex: 1;
}

#copy-color {
    background: none;
    border: 1px solid #e9ecef;
    color: var(--text-secondary);
    padding: 6px 8px;
    border-radius: 4px;
    cursor: pointer;
    transition: var(--transition);
    margin: 0;
    box-shadow: none;
}

#copy-color:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
    transform: none;
    box-shadow: none;
}

/* 颜色输入框样式 */
#color-input {
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.95rem;
    transition: var(--transition);
}

#color-input.invalid {
    border-color: #ff4757;
    background-color: #fff5f5;
}

#color-input.valid {
    border-color: #2ed573;
    background-color: #f0fff4;
}

.color-input-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 8px;
    gap: 12px;
}

.color-format-buttons {
    display: flex;
    gap: 4px;
}

.format-btn {
    background: #f8f9fa;
    border: 1px solid #e9ecef;
    color: var(--text-secondary);
    padding: 4px 8px;
    border-radius: 4px;
    cursor: pointer;
    transition: var(--transition);
    margin: 0;
    box-shadow: none;
    font-size: 0.75rem;
    font-weight: 500;
}

.format-btn:hover {
    background: #e9ecef;
    transform: none;
    box-shadow: none;
}

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

.color-validation {
    display: flex;
    align-items: center;
    gap: 4px;
    font-size: 0.8rem;
    transition: var(--transition);
}

.valid-icon {
    color: #2ed573;
}

.invalid-icon {
    color: #ff4757;
}

.validation-text {
    color: var(--text-secondary);
}

/* 预设颜色样式 */
.preset-colors {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    padding: 8px;
    background: #f8f9fa;
    border-radius: 8px;
    border: 1px solid #e9ecef;
}

.preset-color {
    width: 32px;
    height: 32px;
    border-radius: 6px;
    cursor: pointer;
    border: 2px solid transparent;
    transition: var(--transition);
    position: relative;
}

.preset-color:hover {
    border-color: var(--primary-color);
    transform: scale(1.1);
}

.preset-color[data-color="#FFFFFF"] {
    border: 2px solid #e9ecef;
}

.preset-color[data-color="#FFFFFF"]:hover {
    border-color: var(--primary-color);
}

/* 拖拽样式 */
body.drag-over {
    background-color: rgba(0, 102, 204, 0.1);
}

body.drag-over::after {
    content: '拖拽图片到此处提取颜色';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 102, 204, 0.9);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    font-weight: 600;
    z-index: 9999;
    pointer-events: none;
}

/* 通知样式 */
.notification {
    position: fixed;
    top: 20px;
    right: 20px;
    background: var(--primary-color);
    color: white;
    padding: 12px 20px;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 102, 204, 0.3);
    transform: translateX(100%);
    opacity: 0;
    transition: all 0.3s ease;
    z-index: 1000;
    font-weight: 500;
}

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

/* 快速操作按钮 */
.quick-actions {
    display: flex;
    gap: 8px;
}

.quick-actions button {
    flex: 1;
    padding: 10px;
    margin: 0;
    font-size: 0.9rem;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    box-shadow: 0 2px 8px rgba(102, 126, 234, 0.3);
}

.quick-actions button:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
}

.quick-actions button.active {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    box-shadow: 0 4px 12px rgba(245, 87, 108, 0.4);
}

/* 渐变控制 */
.gradient-direction {
    margin-top: 8px;
}

.gradient-direction label {
    font-size: 0.85rem;
    margin-bottom: 4px;
    display: block;
}

/* 颜色历史 */
.color-history {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    min-height: 40px;
    padding: 8px;
    background: #f8f9fa;
    border-radius: 8px;
    border: 1px solid #e9ecef;
}

.color-history-item {
    width: 32px;
    height: 32px;
    border-radius: 6px;
    cursor: pointer;
    border: 2px solid transparent;
    transition: var(--transition);
    position: relative;
}

.color-history-item:hover {
    border-color: var(--primary-color);
    transform: scale(1.1);
}

.color-history-item::after {
    content: attr(data-color);
    position: absolute;
    bottom: -25px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.7rem;
    color: var(--text-secondary);
    background: rgba(0, 0, 0, 0.8);
    color: white;
    padding: 2px 6px;
    border-radius: 3px;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s;
    white-space: nowrap;
}

.color-history-item:hover::after {
    opacity: 1;
}

input[type="number"] {
    -moz-appearance: textfield;
}

input[type="number"]::-webkit-outer-spin-button,
input[type="number"]::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

button {
    background: linear-gradient(90deg, #0066CC, #0095ff);
    color: white;
    border: none;
    padding: 14px 26px;
    font-size: 1rem;
    font-weight: 500;
    border-radius: 10px;
    cursor: pointer;
    transition: var(--transition);
    margin-top: 0.8rem;
    box-shadow: 0 4px 10px rgba(0, 102, 204, 0.25);
    animation: slideIn 0.5s ease 0.5s backwards;
    position: relative;
    overflow: hidden;
}

button i {
    margin-right: 8px;
    transition: transform 0.3s ease;
}

button.downloading i {
    animation: downloadPulse 1.5s ease;
}

@keyframes downloadPulse {
    0% { transform: translateY(0); }
    20% { transform: translateY(3px); }
    30% { transform: translateY(-5px); }
    40% { transform: translateY(0); }
    50% { transform: translateY(0); }
    100% { transform: translateY(0); }
}

button::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(rgba(255, 255, 255, 0.1), rgba(255, 255, 255, 0));
    opacity: 0;
    transition: opacity 0.3s ease;
}

button:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 15px rgba(0, 102, 204, 0.35);
}

button:hover::after {
    opacity: 1;
}

button:active {
    transform: translateY(1px);
    box-shadow: 0 2px 5px rgba(0, 102, 204, 0.25);
}

/* 下载区域 */
.download-section {
    margin-top: 1rem;
}

.download-info {
    margin-top: 8px;
    text-align: center;
}

.download-info small {
    color: var(--text-secondary);
    font-size: 0.8rem;
}

/* 预览容器增强 */
.preview-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    padding: 0 4px;
}

.preview-title {
    font-weight: 500;
    color: var(--text-color);
    font-size: 1rem;
}

.preview-controls {
    display: flex;
    gap: 4px;
}

.preview-controls button {
    background: none;
    border: 1px solid #e9ecef;
    color: var(--text-secondary);
    padding: 6px 8px;
    border-radius: 6px;
    cursor: pointer;
    transition: var(--transition);
    margin: 0;
    box-shadow: none;
    font-size: 0.8rem;
}

.preview-controls button:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
    transform: none;
    box-shadow: none;
}

/* 加载动画 */
.loading-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.9);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    border-radius: 8px;
}

.loading-overlay.show {
    opacity: 1;
    visibility: visible;
}

.loading-spinner {
    width: 32px;
    height: 32px;
    border: 3px solid #f3f3f3;
    border-top: 3px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 8px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.loading-overlay span {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.preview-container {
    flex-grow: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: var(--card-bg);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
    padding: var(--spacing);
    overflow: hidden;
    position: relative;
    transition: var(--transition);
}

.preview-container::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    width: 6px;
    background: linear-gradient(180deg, #0066CC, #5AC8FA);
    z-index: 2;
}

.preview-container:hover {
    box-shadow: var(--shadow-md), 0 10px 30px rgba(0, 102, 204, 0.1);
}

.preview-wrapper {
    max-width: 100%;
    overflow: auto;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 300px;
    position: relative;
    transition: transform 0.3s ease;
    padding: 10px;
}

/* 预览信息 */
.preview-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 1rem;
    padding: 8px 12px;
    background: rgba(255, 255, 255, 0.8);
    border-radius: 8px;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.scale-info, .canvas-info {
    font-weight: 500;
}

/* Footer 增强 */
.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.footer-links {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

kbd {
    background: #f8f9fa;
    border: 1px solid #dee2e6;
    border-radius: 3px;
    padding: 2px 6px;
    font-size: 0.8rem;
    font-family: monospace;
    margin: 0 2px;
}

canvas {
    display: block;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    border-radius: 3px;
    opacity: 1;
    transition: opacity 0.3s ease, transform 0.5s ease;
    transform-origin: center center;
}

footer {
    text-align: center;
    margin-top: 3rem;
    color: var(--text-secondary);
    font-size: 0.95rem;
    padding: 1rem;
    opacity: 0.8;
    animation: fadeIn 0.8s ease-out 0.4s backwards;
}

/* 滚动条样式 */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
    border-radius: 5px;
}

::-webkit-scrollbar-thumb {
    background: #c1c1c1;
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: #a8a8a8;
}