/**
 * 公共样式 - 所有页面共享
 * 包含：CSS 变量、重置样式、页面标题、通用区块、页脚、响应式
 */

:root {
    --primary: #5EAAA8;
    --primary-dark: #4A8A8A;
    --primary-light: #8FCACA;
    --primary-pale: #C5E4E3;
    --white: #ffffff;
    --off-white: #f8f9fa;
    --text-dark: #1a1a1a;
    --text-light: #333333;
    --text-gray: #666666;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'WenQuanYi Micro Hei', sans-serif;
    color: var(--text-light);
    line-height: 1.6;
    padding-top: 64px;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ========== 页面标题 ========== */
.page-header {
    aspect-ratio: 3840 / 919;
    min-height: 200px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 0;
    text-align: center;
    color: #e39423;
}

.page-header p {
    font-size: 18px;
    opacity: 0.9;
    margin-top: 333px;
}

/* ========== 通用区块 ========== */
.section {
    padding: 100px 0;
}

.section-title {
    text-align: center;
    margin-bottom: 60px;
}

.section-title h2 {
    font-size: 42px;
    font-weight: 700;
    color: var(--text-dark);
    font-family: 'STSong', 'SimSun', serif;
    margin-bottom: 15px;
}

.section-title p {
    font-size: 16px;
    color: var(--text-gray);
}

.title-decoration {
    width: 60px;
    height: 3px;
    background: var(--primary);
    margin: 20px auto 0;
}

/* ========== 页脚 ========== */
.footer {
    background: var(--text-dark);
    color: white;
    padding: 80px 0 30px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 50px;
    margin-bottom: 50px;
}

.footer-brand h3 {
    font-size: 28px;
    margin-bottom: 20px;
    font-family: 'STSong', 'SimSun', serif;
}

.footer-brand p {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.8;
    margin-bottom: 20px;
}

.footer-social {
    display: flex;
    gap: 15px;
}

.footer-social a {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    text-decoration: none;
    transition: all 0.3s;
}

.footer-social a:hover {
    background: var(--primary);
    transform: translateY(-3px);
}

.footer-column h4 {
    font-size: 18px;
    margin-bottom: 25px;
    position: relative;
    padding-bottom: 10px;
}

.footer-column h4::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 30px;
    height: 2px;
    background: var(--primary);
}

.footer-column ul {
    list-style: none;
}

.footer-column li {
    margin-bottom: 12px;
}

.footer-column a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    font-size: 14px;
    transition: all 0.3s;
}

.footer-column a:hover {
    color: var(--primary);
    padding-left: 5px;
}

.footer-contact li {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 15px;
    font-size: 14px;
    color: rgba(255, 255, 255, 0.7);
}

.footer-contact i {
    color: var(--primary);
    width: 20px;
}

.footer-bottom {
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 14px;
    color: rgba(255, 255, 255, 0.5);
}

.footer-links a {
    color: rgba(255, 255, 255, 0.5);
    text-decoration: none;
    margin-left: 20px;
}

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

/* ========== 滚动动画 ========== */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ========== 响应式：1024px ========== */
@media (max-width: 1024px) {
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* ========== 响应式：768px ========== */
@media (max-width: 768px) {
    .page-header {
        min-height: 180px;
    }

    .page-header p {
        font-size: 15px;
    }

    .section {
        padding: 60px 0;
    }

    .section-title {
        margin-bottom: 40px;
    }

    .section-title h2 {
        font-size: 26px;
        letter-spacing: 1px;
    }

    .title-decoration {
        width: 40px;
        height: 2px;
        margin-top: 15px;
    }

    .footer {
        padding: 50px 0 24px;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .footer-bottom {
        flex-direction: column;
        gap: 12px;
        text-align: center;
    }
}

/* ========== 响应式：480px ========== */
@media (max-width: 480px) {
    .page-header p {
        font-size: 14px;
    }

    .section-title h2 {
        font-size: 22px;
    }
}