/* style.css */
:root {
    --primary-color: #4A90E2;
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
    --shadow-lg: 0 10px 30px rgba(0,0,0,0.1);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
    margin: 0; 
    font-family: 'Inter', sans-serif;
    background: var(--bg); 
    color: var(--text);
    /* 修改以下部分 */
    display: flex; 
    flex-direction: column; /* 纵向排列 */
    align-items: center;    /* 水平居中 */
    justify-content: flex-start; /* 从顶部开始 */
    min-height: 100vh;
    padding: 0; /* 移除默认内边距，方便导航栏置顶 */
}

.container {
    background: var(--card-bg);
    padding: 40px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    width: 100%;
    max-width: 900px;
    transition: var(--transition);
}

.header {
    text-align: center;
    margin-bottom: 40px;
}

h1 {
    font-weight: 700;
    font-size: 2.5rem;
    margin-bottom: 10px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-bottom: 30px;
}

/* 颜色选择器区域 */
.color-picker-section {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    margin-bottom: 50px;
}

@media (max-width: 768px) {
    .color-picker-section {
        grid-template-columns: 1fr;
        gap: 30px;
    }
}

.color-preview {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.color-display {
    position: relative;
    height: 180px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    transition: var(--transition);
    cursor: pointer;
}

.color-display:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.12);
}

.color-info {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: rgba(0,0,0,0.8);
    color: white;
    padding: 15px;
    backdrop-filter: blur(10px);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.color-hex {
    font-family: 'SF Mono', monospace;
    font-size: 1.2rem;
    font-weight: 600;
}

.copy-btn {
    background: rgba(255,255,255,0.2);
    border: none;
    color: white;
    padding: 6px 12px;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    cursor: pointer;
    transition: var(--transition);
}

.copy-btn:hover {
    background: rgba(255,255,255,0.3);
}

.color-picker-wrapper {
    position: relative;
}

.color-picker-wrapper input[type="color"] {
    width: 100%;
    height: 50px;
    border-radius: var(--radius-md);
    border: 2px solid var(--border-color);
    cursor: pointer;
    transition: var(--transition);
}

.color-picker-wrapper input[type="color"]:hover {
    border-color: var(--primary-color);
}

/* 输入区域 */
.color-inputs {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.input-group {
    background: var(--bg-color);
    padding: 15px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.input-group:focus-within {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(74, 144, 226, 0.1);
}

.input-group label {
    display: block;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.input-group input {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-family: 'SF Mono', monospace;
    font-size: 1rem;
    background: white;
    transition: var(--transition);
}

.input-group input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(74, 144, 226, 0.1);
}

/* 调色板区域 */
.palette-section {
    margin-top: 40px;
}

.section-title {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 25px;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 10px;
}

.palette-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 25px;
}

.palette-card {
    background: var(--card-bg);
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.palette-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.palette-header {
    padding: 15px;
    background: var(--bg-color);
    border-bottom: 1px solid var(--border-color);
}

.palette-title {
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--text-primary);
}

.palette-colors {
    display: flex;
    height: 80px;
}

.color-item {
    flex: 1;
    position: relative;
    cursor: pointer;
    transition: var(--transition);
}

.color-item:hover {
    flex: 1.2;
}

.color-item .color-tooltip {
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(0,0,0,0.9);
    color: white;
    padding: 8px 12px;
    border-radius: var(--radius-sm);
    font-family: 'SF Mono', monospace;
    font-size: 0.8rem;
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    margin-bottom: 10px;
}

.color-item:hover .color-tooltip {
    opacity: 1;
    visibility: visible;
}

/* 实用工具区域 */
.utilities-section {
    margin-top: 50px;
    padding-top: 40px;
    border-top: 1px solid var(--border-color);
}

.utility-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.utility-card {
    background: var(--bg-color);
    padding: 20px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.utility-card:hover {
    border-color: var(--primary-color);
}

.utility-card h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 15px;
    color: var(--text-primary);
}

.contrast-ratio {
    font-family: 'SF Mono', monospace;
    font-size: 1.8rem;
    font-weight: 700;
    margin: 10px 0;
}

.contrast-ratio.good { color: #10b981; }
.contrast-ratio.fair { color: #f59e0b; }
.contrast-ratio.poor { color: #ef4444; }

/* 通知系统 */
.notification {
    position: fixed;
    bottom: 30px;
    right: 30px;
    background: var(--text-primary);
    color: white;
    padding: 12px 24px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    gap: 10px;
    opacity: 0;
    transform: translateY(20px);
    transition: var(--transition);
    z-index: 1000;
}

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

.notification.success {
    background: linear-gradient(135deg, #10b981, #059669);
}

/* 加载动画 */
.loading-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 30px auto;
}

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

/* 暗色模式支持 */
@media (prefers-color-scheme: dark) {
    :root {
        --bg-color: #0f172a;
        --card-bg: #1e293b;
        --text-primary: #f1f5f9;
        --text-secondary: #94a3b8;
        --border-color: #334155;
    }
    
    body {
        background: var(--bg-color);
    }
}