/* ========================================
   健身器材国际站 - 蓝白配色B2B风格
   专业、清爽、值得信赖
======================================== */

/* 全局重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* 主色调 - 蓝色系 */
    --color-primary: #0066cc;
    --color-primary-dark: #004c99;
    --color-primary-light: #3385d6;
    --color-secondary: #00a6ff;
    
    /* 辅助色 */
    --color-success: #28a745;
    --color-warning: #ffc107;
    --color-danger: #dc3545;
    --color-info: #17a2b8;
    
    /* 灰度 */
    --color-white: #ffffff;
    --color-gray-50: #f8f9fa;
    --color-gray-100: #f1f3f5;
    --color-gray-200: #e9ecef;
    --color-gray-300: #dee2e6;
    --color-gray-400: #ced4da;
    --color-gray-500: #adb5bd;
    --color-gray-600: #6c757d;
    --color-gray-700: #495057;
    --color-gray-800: #343a40;
    --color-gray-900: #212529;
    
    /* 字体 */
    --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-heading: 'Helvetica Neue', Arial, sans-serif;
    
    /* 间距 */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-xxl: 4rem;
    
    /* 阴影 */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.15);
    
    /* 圆角 */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    
    /* 过渡 */
    --transition: all 0.3s ease;
}

body {
    font-family: var(--font-primary);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-gray-800);
    background-color: var(--color-gray-50);
    overflow-x: hidden;
}

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

.container-fluid {
    width: 100%;
    padding: 0 var(--spacing-md);
}

.container-wide {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* 标题样式 */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    color: var(--color-gray-900);
    line-height: 1.3;
    margin-bottom: var(--spacing-sm);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.75rem; }
h4 { font-size: 1.5rem; }
h5 { font-size: 1.25rem; }
h6 { font-size: 1rem; }

/* 链接 */
a {
    color: var(--color-primary);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    color: var(--color-primary-dark);
}

/* 按钮 */
.btn {
    display: inline-block;
    padding: 0.75rem 2rem;
    font-size: 1rem;
    font-weight: 600;
    text-align: center;
    text-decoration: none;
    border: 2px solid transparent;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
    line-height: 1.5;
}

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

.btn-primary:hover {
    background-color: var(--color-primary-dark);
    border-color: var(--color-primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    color: var(--color-white);
}

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

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

.btn-outline {
    background-color: transparent;
    color: var(--color-gray-700);
    border-color: var(--color-gray-300);
}

.btn-outline:hover {
    background-color: var(--color-gray-100);
    border-color: var(--color-gray-400);
}

.btn-large {
    padding: 1rem 2.5rem;
    font-size: 1.125rem;
}

.btn-small {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

/* ========================================
   顶部导航
======================================== */
.top-bar {
    background-color: var(--color-primary-dark);
    color: var(--color-white);
    padding: 0.5rem 0;
    font-size: 0.875rem;
    transition: all 0.3s ease;
}

.top-bar.hidden {
    transform: translateY(-100%);
    opacity: 0;
    height: 0;
    padding: 0;
    overflow: hidden;
}

.top-bar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.top-bar a {
    color: var(--color-white);
    margin: 0 0.75rem;
}

.top-bar a:hover {
    color: var(--color-secondary);
}

.lang-switch {
    display: flex;
    gap: 0.5rem;
}

.lang-switch a {
    padding: 0.25rem 0.5rem;
    border-radius: 3px;
    margin: 0;
}

.lang-switch a:hover,
.lang-switch a.active {
    background-color: rgba(255, 255, 255, 0.2);
}

/* 主导航 */
.header {
    background-color: var(--color-white);
    box-shadow: var(--shadow-md);
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: all 0.3s ease;
}

.header.scrolled {
    box-shadow: var(--shadow-lg);
}

.header.scrolled .header-main {
    padding: 0.5rem 0;
}

.header.scrolled .nav {
    display: none;
}

.header.scrolled .logo-text {
    font-size: 1.5rem;
}

.header-main {
    padding: 1rem 0;
}

.header-main .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo-text {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--color-primary);
    letter-spacing: -0.5px;
}

.logo-text span {
    color: var(--color-secondary);
}

.nav {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.nav a {
    color: var(--color-gray-700);
    font-weight: 500;
    position: relative;
    padding: 0.5rem 0;
    transition: var(--transition);
}

.nav a:hover,
.nav a.active {
    color: var(--color-primary);
}

.nav a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 3px;
    background-color: var(--color-primary);
    transition: var(--transition);
}

.nav a:hover::after,
.nav a.active::after {
    width: 100%;
}

.header-actions {
    display: flex;
    gap: var(--spacing-sm);
    align-items: center;
}

.search-box {
    position: relative;
}

/* 滚动时的语言切换样式 */
.lang-switch-compact {
    display: none;
    gap: 0.5rem;
    margin-left: 1rem;
}

.header.scrolled .lang-switch-compact {
    display: flex;
}

.lang-switch-compact a {
    padding: 0.375rem 0.75rem;
    background: #f8f9fa;
    border-radius: 4px;
    color: #495057;
    font-size: 0.875rem;
    font-weight: 500;
    transition: all 0.3s ease;
}

.lang-switch-compact a:hover,
.lang-switch-compact a.active {
    background: #0066cc;
    color: white;
}

.search-input {
    padding: 0.625rem 2.5rem 0.625rem 1rem;
    background-color: var(--color-gray-100);
    border: 1px solid var(--color-gray-300);
    border-radius: 25px;
    color: var(--color-gray-800);
    width: 280px;
    transition: var(--transition);
}

.search-input:focus {
    outline: none;
    border-color: var(--color-primary);
    background-color: var(--color-white);
    box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.1);
}

.header.scrolled .search-input {
    width: 400px;
}

.search-btn {
    position: absolute;
    right: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--color-gray-600);
    cursor: pointer;
    font-size: 1.125rem;
}

/* ========================================
   页脚
======================================== */
.footer {
    background-color: var(--color-gray-900);
    color: var(--color-gray-400);
    padding-top: var(--spacing-xxl);
    margin-top: var(--spacing-xxl);
}

.footer-main {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr 1fr;
    gap: var(--spacing-xl);
    padding-bottom: var(--spacing-xl);
    border-bottom: 1px solid var(--color-gray-800);
}

.footer h3,
.footer h4 {
    color: var(--color-white);
    margin-bottom: var(--spacing-md);
}

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

.footer-links li {
    margin-bottom: 0.75rem;
}

.footer-links a {
    color: var(--color-gray-400);
    transition: var(--transition);
}

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

.footer-bottom {
    padding: var(--spacing-lg) 0;
    text-align: center;
}

.social-links {
    display: flex;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-sm);
}

.social-links a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background-color: var(--color-gray-800);
    border-radius: 50%;
    color: var(--color-white);
    transition: var(--transition);
}

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

/* ========================================
   通用组件
======================================== */

/* Section */
.section {
    padding: var(--spacing-xxl) 0;
}

.section-alt {
    background-color: var(--color-white);
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.section-title {
    font-size: 2.25rem;
    margin-bottom: var(--spacing-sm);
    color: var(--color-gray-900);
}

.section-subtitle {
    color: var(--color-gray-600);
    font-size: 1.125rem;
    max-width: 700px;
    margin: 0 auto;
}

/* Card */
.card {
    background-color: var(--color-white);
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: var(--transition);
    height: 100%;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--color-primary);
}

.card-img {
    width: 100%;
    height: 220px;
    object-fit: cover;
    display: block;
}

.card-body {
    padding: var(--spacing-md);
}

.card-title {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-sm);
    color: var(--color-gray-900);
}

.card-text {
    color: var(--color-gray-600);
    margin-bottom: var(--spacing-sm);
    line-height: 1.6;
}

.card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--spacing-sm);
    border-top: 1px solid var(--color-gray-200);
    margin-top: var(--spacing-sm);
}

/* Grid */
.grid {
    display: grid;
    gap: var(--spacing-lg);
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-5 { grid-template-columns: repeat(5, 1fr); }
.grid-6 { grid-template-columns: repeat(6, 1fr); }

/* Badge */
.badge {
    display: inline-block;
    padding: 0.375rem 0.75rem;
    font-size: 0.875rem;
    font-weight: 600;
    border-radius: 12px;
    background-color: var(--color-gray-200);
    color: var(--color-gray-700);
}

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

.badge-success { 
    background-color: var(--color-success); 
    color: var(--color-white);
}

.badge-warning { 
    background-color: var(--color-warning); 
    color: var(--color-gray-900);
}

.badge-info {
    background-color: var(--color-info);
    color: var(--color-white);
}

/* 面包屑 */
.breadcrumb {
    display: flex;
    gap: 0.5rem;
    padding: var(--spacing-md) 0;
    font-size: 0.875rem;
    background-color: var(--color-white);
}

.breadcrumb a {
    color: var(--color-primary);
}

.breadcrumb span {
    color: var(--color-gray-500);
}

/* 分页 */
.pagination {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    margin-top: var(--spacing-xl);
}

.pagination a,
.pagination span {
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 40px;
    height: 40px;
    padding: 0 0.75rem;
    background-color: var(--color-white);
    border: 1px solid var(--color-gray-300);
    border-radius: var(--radius-sm);
    color: var(--color-gray-700);
    transition: var(--transition);
}

.pagination a:hover {
    background-color: var(--color-primary);
    border-color: var(--color-primary);
    color: var(--color-white);
}

.pagination .active {
    background-color: var(--color-primary);
    border-color: var(--color-primary);
    color: var(--color-white);
}

/* ========================================
   广告位样式
======================================== */
.ad-banner {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    margin: var(--spacing-lg) 0;
}

.ad-banner img {
    width: 100%;
    height: auto;
    display: block;
}

.ad-banner-large {
    height: 400px;
}

.ad-banner-medium {
    height: 250px;
}

.ad-banner-small {
    height: 150px;
}

/* ========================================
   特殊效果
======================================== */
.gradient-bg {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
}

.text-gradient {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* 信任标记 */
.trust-badges {
    display: flex;
    justify-content: center;
    gap: 2rem;
    flex-wrap: wrap;
    padding: 2rem 0;
}

.trust-badge {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--color-gray-600);
    font-size: 0.875rem;
}

.trust-badge-icon {
    width: 24px;
    height: 24px;
    color: var(--color-success);
}

/* ========================================
   响应式设计
======================================== */
@media (max-width: 1024px) {
    .footer-main {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .grid-4,
    .grid-5,
    .grid-6 {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 768px) {
    h1 { font-size: 2rem; }
    h2 { font-size: 1.75rem; }
    
    .nav {
        display: none;
    }
    
    .search-input {
        width: 180px;
    }
    
    .footer-main {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .grid-2,
    .grid-3,
    .grid-4,
    .grid-5,
    .grid-6 {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .footer-main,
    .grid-2,
    .grid-3,
    .grid-4,
    .grid-5,
    .grid-6 {
        grid-template-columns: 1fr;
    }
}

/* ========================================
   动画效果
======================================== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in-up {
    animation: fadeInUp 0.6s ease-out;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* 加载动画 */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid var(--color-gray-300);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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