:root {
    /* 颜色变量 */
    --color-primary: #FF6B6B;
    --color-primary-hover: #FF5252;
    --color-primary-active: #FF3838;
    --color-secondary: #4ECDC4;
    --color-accent: #FFE66D;
    
    --color-text-primary: #2C3E50;
    --color-text-secondary: #7F8C8D;
    --color-text-light: #BDC3C7;
    
    --color-bg-primary: #FFFFFF;
    --color-bg-secondary: #F9FAFB;
    --color-border: #E6E9EC;

    /* 间距变量 */
    --spacing-xs: 8px;
    --spacing-sm: 12px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-xxl: 48px;

    /* 字体变量 */
    --font-family-base: -apple-system, "SF Pro SC", "SF Pro Text", "SF Pro Icons", "PingFang SC", "Helvetica Neue", "Helvetica", "Arial", sans-serif;
}

/* 基础样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-family-base);
    color: var(--color-text-primary);
    line-height: 1.5;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 12px 24px;
    border-radius: 8px;
    border: none;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
}

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

.btn--primary:hover {
    background-color: var(--color-primary-hover);
    transform: translateY(-2px);
}

/* 首页样式 */
.landing {
    height: 100vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, var(--color-bg-secondary) 0%, #fff 100%);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.landing__content {
    max-width: 600px;
    margin: 0 auto;
}

.landing__title {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    line-height: 1.2;
    display: inline-block;
    position: relative;
    background: linear-gradient(
        120deg,
        #FF6B6B 0%,
        #FF8E53 20%,
        #FFB347 40%,
        #4ECDC4 60%,
        #6C88C4 80%,
        #FF6B6B 100%
    );
    background-size: 300% auto;
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    color: transparent;
    animation: rainbow 6s linear infinite;
    /* 平滑渲染 */
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    /* 确保在某些浏览器中正确显示 */
    will-change: background-position;
    transform: translateZ(0);
    -webkit-transform: translateZ(0);
}

@keyframes rainbow {
    to {
        background-position: 300% center;
    }
}

/* 针对 Safari 的特殊处理 */
@media not all and (min-resolution:.001dpcm) { 
    @supports (-webkit-appearance:none) {
        .landing__title {
            -webkit-text-stroke: 1px transparent;
        }
    }
}

.landing__subtitle {
    font-size: 20px;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xl);
}

.landing__cta {
    padding: 16px 48px;
    font-size: 18px;
    letter-spacing: 1px;
    box-shadow: 0 4px 12px rgba(255, 107, 107, 0.2);
    transition: all 0.2s ease;
}

.landing__cta:active {
    transform: scale(0.95);
    opacity: 0.9;
}

/* 特性区域样式 */
.features {
    padding: var(--spacing-xxl) 0;
}

.features__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-xl);
}

.feature-card {
    padding: var(--spacing-xl);
    background: var(--color-bg-primary);
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .landing__title {
        font-size: 36px;
    }
    
    .landing__subtitle {
        font-size: 18px;
    }
    
    .features__grid,
    .process__steps {
        grid-template-columns: 1fr;
    }
}

/* 模态框样式 */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    justify-content: center;
    align-items: center;
    z-index: 1000;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.modal.show {
    display: flex;
    opacity: 1;
}

.modal__content {
    background-color: var(--color-bg-primary);
    padding: var(--spacing-xl);
    border-radius: 12px;
    max-width: 400px;
    width: 90%;
    text-align: center;
    transform: translateY(20px);
    transition: transform 0.3s ease;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.16);
}

.modal.show .modal__content {
    transform: translateY(0);
}

.modal h3 {
    margin-bottom: var(--spacing-md);
    color: var(--color-text-primary);
}

.modal p {
    margin-bottom: var(--spacing-md);
    color: var(--color-text-secondary);
}

.modal__note {
    font-size: 14px;
    color: var(--color-text-light) !important;
    margin-bottom: var(--spacing-lg) !important;
}

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

.btn--secondary:hover {
    background-color: #45b8b0;
    transform: translateY(-2px);
}

/* 底部样式 */
.footer {
    text-align: center;
    position: absolute;
    bottom: var(--spacing-lg);
    left: 0;
    right: 0;
}

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

/* 首页特殊处理 */
body.homepage {
    overflow: hidden;
}