/* Base styles that apply to all themes */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
}

a {
    text-decoration: none;
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
}

/* Utility classes */
.text-center {
    text-align: center;
}

.mt-1 { margin-top: 1rem; }
.mt-2 { margin-top: 2rem; }
.mt-3 { margin-top: 3rem; }
.mt-4 { margin-top: 4rem; }
.mt-5 { margin-top: 5rem; }

.mb-1 { margin-bottom: 1rem; }
.mb-2 { margin-bottom: 2rem; }
.mb-3 { margin-bottom: 3rem; }
.mb-4 { margin-bottom: 4rem; }
.mb-5 { margin-bottom: 5rem; }

.p-1 { padding: 1rem; }
.p-2 { padding: 2rem; }
.p-3 { padding: 3rem; }
.p-4 { padding: 4rem; }
.p-5 { padding: 5rem; }

/* Layout styles */
.flex {
    display: flex;
}

.flex-col {
    flex-direction: column;
}

.justify-between {
    justify-content: space-between;
}

.items-center {
    align-items: center;
}

.grid {
    display: grid;
}

/* Animation classes */
.fade-in {
    animation: fadeIn 0.5s ease-in;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.slide-up {
    animation: slideUp 0.5s ease-out;
}

@keyframes slideUp {
    from { 
        opacity: 0;
        transform: translateY(20px);
    }
    to { 
        opacity: 1;
        transform: translateY(0);
    }
}

/* PC端样式（min-width: 769px） */
@media (min-width: 769px) {
    .containers {
      width: 90%;
      margin: auto;
      padding: 0 10px;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    
    .main-nav a{
        font-size: .8rem;
    }
    
    .language-switcher {
        font-size: 0.8rem;
    }
    
    .btn-contact{
        font-size: 0.8rem;
    }
}

/* 通用移动端样式 */
@media (max-width: 768px) {
    /* 基础布局调整 */
    .container {
        width: 95%;
        padding: 0 10px;
    }
    
    .containers {
        width: 95%;
        padding: 0 10px;
        display: flex;
        justify-content: space-between;
        align-items: center;
    }
    
    /* 导航栏优化 */
    .navbar {
        padding: 0.8rem 0;
    }
    
    .logo img {
        height: 30px;
    }
    
    .main-nav {
        display: none;
        position: fixed;
        top: 70px;
        left: 0;
        width: 100%;
        background-color: var(--darker-bg);
        padding: 1rem;
        box-shadow: 0 5px 10px rgba(0, 0, 0, 0.3);
        z-index: 999;
    }
    
    .main-nav.active {
        display: block;
    }
    
    .main-nav ul {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .main-nav li {
        width: 100%;
    }
    
    .main-nav a {
        display: block;
        padding: 0.8rem;
    }
    
    .mobile-menu-btn {
        display: block;
        background: none;
        border: none;
        color: white;
        font-size: 1.5rem;
        cursor: pointer;
        margin-left: .2rem;
    }
    
    .nav-actions {
        margin-left: auto;
        gap: 1rem;
    }
    
    .language-switcher {
        font-size: 0.9rem;
    }
    
    .btn-contact {
        padding: 0.4rem 1rem;
        font-size: 0.9rem;
    }
    
    /* 页面标题优化 */
    .page-hero h1 {
        font-size: 1.8rem;
        margin-bottom: 0.5rem;
    }
    
    .page-hero p {
        font-size: 1rem;
    }
    
    /* 内容卡片优化 */
    .content-card {
        padding: 1.5rem;
    }
    
    /* 按钮优化 */
    .btn-primary, .btn-secondary {
        display: block;
        width: 100%;
        text-align: center;
        margin-bottom: 0.5rem;
    }
    
    /* 页脚优化 */
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .footer-col {
        margin-bottom: 1.5rem;
    }
    
    /* 通用间距调整 */
    section {
        padding: 2.5rem 0;
    }
    
    h2 {
        font-size: 1.5rem;
    }
    
    h3 {
        font-size: 1.2rem;
    }
}