:root {
    --primary-color: #4285F4;
    --error-color: #EA4335;
    --success-color: #34A853;
    --warning-color: #FBBC05;
    --text-color: #202124;
    --secondary-text: #5F6368;
    --border-color: #DADCE0;
    --background-color: #FFFFFF;
    --card-shadow: 0 1px 2px 0 rgba(60,64,67,0.3), 0 2px 6px 2px rgba(60,64,67,0.15);
    --input-focus-shadow: 0 0 0 2px rgba(66,133,244,0.3);
}

body {
    font-family: 'Google Sans', 'Roboto', Arial, sans-serif;
    background-color: #F8F9FA;
    color: var(--text-color);
    margin: 0;
    padding: 20px;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    line-height: 1.5;
}

.card {
    background-color: var(--background-color);
    border-radius: 8px;
    box-shadow: var(--card-shadow);
    padding: 24px;
    max-width: 500px;
    height: auto;
    width: 100%;
    box-sizing: border-box;
}

h1 {
    color: var(--text-color);
    font-size: 24px;
    font-weight: 500;
    margin: 0 0 20px 0;
    text-align: center;
}

.input-group {
    margin-bottom: 20px;
}

label {
    display: block;
    margin-bottom: 8px;
    color: var(--secondary-text);
    font-size: 14px;
    font-weight: 500;
}

.input-field, .text-input, .rgb-input {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 14px;
    box-sizing: border-box;
    transition: border 0.2s, box-shadow 0.2s;
}

.input-field:focus, .text-input:focus, .rgb-input:focus {
    border-color: var(--primary-color);
    outline: none;
    box-shadow: var(--input-focus-shadow);
}

.rgb-inputs {
    display: flex;
    gap: 10px;
}

.rgb-inputs > div {
    flex: 1;
}

.btn {
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 4px;
    padding: 10px 24px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    width: 100%;
    transition: background-color 0.2s, box-shadow 0.2s;
}

.btn:hover {
    background-color: #3367D6;
    box-shadow: 0 1px 2px 0 rgba(66,133,244,0.3);
}

.btn:active {
    background-color: #2A56C6;
}

#error {
    color: var(--error-color);
    font-size: 13px;
    margin: 10px 0;
    min-height: 20px;
}

.result {
    margin-top: 24px;
    border-top: 1px solid var(--border-color);
    padding-top: 16px;
}

.result-item {
    display: flex;
    justify-content: space-between;
    margin-bottom: 12px;
}

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

.result-value {
    font-weight: 500;
}

.highlight {
    color: var(--primary-color);
    font-weight: 500;
}

.note {
    margin-top: 24px;
    padding-top: 16px;
    border-top: 1px solid var(--border-color);
    font-size: 13px;
    color: var(--secondary-text);
}

.note p {
    margin: 8px 0;
}

/* 颜色选择器特定样式 */
.color-preview {
    width: 100%;
    height: 80px;
    border-radius: 4px;
    margin-bottom: 20px;
    border: 1px solid var(--border-color);
    transition: background-color 0.2s;
}

input[type="color"] {
    width: 100%;
    height: 40px;
    margin-bottom: 20px;
    cursor: pointer;
    border: 1px solid var(--border-color);
    border-radius: 4px;
}

input[type="radio"] {
    margin-right: 8px;
}

/* 调整主容器 */
.main-container {
    max-width: 1200px;
    width: 100%;
    padding: 20px;
}

@media (max-width: 600px) {
    .card {
        padding: 16px;
    }
    
    h1 {
        font-size: 20px;
    }
}

/* 预设颜色区域样式 */
.preset-colors {
    margin: 20px 0;
}

.preset-colors h3 {
    margin-bottom: 10px;
    font-size: 16px;
    color: #555;
}

.color-group {
    margin-bottom: 15px;
}

.color-group h4 {
    margin: 10px 0 5px;
    font-size: 14px;
    color: #666;
}

.color-item {
    display: flex;
    align-items: center;
    gap: 6px;  /* 缩小间距 */
    cursor: pointer;
    padding: 2px;  /* 缩小内边距 */
    border-radius: 4px;
}

.preset-color {
    width: 30px;  /* 缩小宽度 */
    height: 30px;  /* 缩小高度 */
    border-radius: 4px;
    border: 1px solid var(--border-color);
}

.color-label {
    font-size: 12px;  /* 缩小字体 */
    color: var(--secondary-text);
    white-space: nowrap;
}

.preset-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));  /* 调整最小宽度 */
    gap: 8px;  /* 缩小间距 */
}

.preset-color:hover {
    background-color: rgba(0,0,0,0.05);
}