/* ===== 全局变量 ===== */
:root {
    /* PetiLoop 主题色 */
    --primary-color: #3E87A3;
    --primary-dark: #2C5F6F;
    --primary-light: #5FA2BC;
    --secondary-color: #3E87A3;
    --secondary-dark: #D68910;
    
    /* 渐变背景 */
    --gradient-start: #3E87A3;
    --gradient-mid: #203A58;
    --gradient-end: #1F3F4E;
    
    /* 健康相关颜色 */
    --health-weight: #EF4444;
    --health-exercise: #6DD47E;
    --health-diet: #FFA07A;
    --health-water: #4ECDC4;
    --health-medical: #C084FC;
    
    /* 文本颜色 */
    --text-primary: #333333;
    --text-secondary: #666666;
    --text-tertiary: #999999;
    --text-white: #FFFFFF;
    
    /* 背景颜色 */
    --bg-white: #FFFFFF;
    --bg-light: #F8F9FA;
    --bg-gray: #F5F5F5;
    
    /* 阴影 */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.15);
    
    /* 间距 */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 3rem;
    --spacing-xl: 4rem;
    
    /* 字体 */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

/* ===== 重置样式 ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

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

/* ===== 导航栏 ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    transition: all 0.3s ease;
}

.navbar.scrolled {
    box-shadow: var(--shadow-md);
}

.nav-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--primary-color);
}

.logo-img {
    height: 40px;
    width: auto;
    object-fit: contain;
}

.logo-icon {
    font-size: 1.5rem;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-md);
    align-items: center;
}

.nav-menu a {
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
}

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

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: width 0.3s ease;
}

.nav-menu a:hover::after {
    width: 100%;
}

.btn-download-nav {
    background: var(--secondary-color);
    color: white !important;
    padding: 0.5rem 1.25rem;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.btn-download-nav:hover {
    background: var(--primary-dark);
    color: white !important;
    transform: translateY(-2px);
}

.btn-download-nav::after {
    display: none;
}

/* 语言切换器 */
.lang-switcher {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-left: var(--spacing-sm);
    padding-left: var(--spacing-sm);
    border-left: 1px solid rgba(0, 0, 0, 0.1);
}

.lang-switcher span {
    color: var(--primary-color);
    font-weight: 600;
    font-size: 0.9rem;
}

.lang-switcher a {
    color: var(--text-secondary);
    font-size: 0.9rem;
    text-decoration: none;
    transition: color 0.3s ease;
}

.lang-switcher a:hover {
    color: var(--primary-color);
}

.lang-switcher a::after {
    display: none;
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.mobile-menu-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: all 0.3s ease;
}

/* ===== Hero 区域 ===== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 100px;
    padding-bottom: 120px;
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, #D6E0E4 0%, #E8F0F3 50%, #D6E0E4 100%);
    z-index: -1;
}

.hero-shapes {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    overflow: hidden;
}

.shape {
    position: absolute;
    border-radius: 50%;
    opacity: 0.1;
    animation: float 20s ease-in-out infinite;
}

.shape-1 {
    width: 400px;
    height: 400px;
    background: var(--primary-color);
    top: -100px;
    right: -100px;
    animation-delay: 0s;
}

.shape-2 {
    width: 300px;
    height: 300px;
    background: var(--secondary-color);
    bottom: -50px;
    left: -50px;
    animation-delay: 5s;
}

.shape-3 {
    width: 200px;
    height: 200px;
    background: var(--primary-light);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation-delay: 10s;
}

@keyframes float {
    0%, 100% { 
        transform: translate(0, 0) scale(1);
    }
    33% { 
        transform: translate(30px, -30px) scale(1.1);
    }
    66% { 
        transform: translate(-20px, 20px) scale(0.9);
    }
}

.hero-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    position: relative;
    z-index: 1;
    max-width: 900px;
    margin: 0 auto;
    margin-bottom: 60px;
}

.hero-logo-section {
    margin-bottom: var(--spacing-lg);
    animation: fadeInUp 0.8s ease 0.1s both;
}

.hero-main-logo {
    max-width: 400px;
    width: 100%;
    height: auto;
    filter: drop-shadow(0 8px 24px rgba(0, 0, 0, 0.1));
}

.hero-text-section {
    width: 100%;
}

.hero-title {
    margin-bottom: var(--spacing-md);
    animation: fadeInUp 0.8s ease 0.3s both;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.title-main {
    font-size: 3rem;
    font-weight: 700;
    line-height: 1.3;
    color: var(--text-primary);
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: block;
}

.title-sub {
    font-size: 1.5rem;
    font-weight: 400;
    color: var(--text-secondary);
    display: block;
    margin-top: var(--spacing-xs);
}

.hero-description {
    font-size: 1.25rem;
    line-height: 1.8;
    margin-bottom: var(--spacing-lg);
    color: var(--text-secondary);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
    animation: fadeInUp 0.8s ease 0.5s both;
}

.hero-features {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
    animation: fadeInUp 0.8s ease 0.7s both;
}

.hero-feature-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
    background: rgba(255, 255, 255, 0.6);
    border-radius: 50px;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.8);
    font-size: 0.95rem;
    color: var(--text-primary);
    font-weight: 500;
    transition: all 0.3s ease;
}

.hero-feature-item:hover {
    background: rgba(255, 255, 255, 0.9);
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

.feature-icon-small {
    font-size: 1.25rem;
    line-height: 1;
}

.hero-buttons {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
    animation: fadeInUp 0.8s ease 0.9s both;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 0.875rem 1.75rem;
    border-radius: 12px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
}

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

.btn-primary:hover {
    background: var(--secondary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.8);
    color: var(--text-primary);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(0, 0, 0, 0.1);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 1);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.hero-image {
    display: flex;
    justify-content: center;
    align-items: center;
    animation: fadeInRight 1s ease 0.3s both;
}

.phone-mockup {
    position: relative;
    width: 300px;
    height: 600px;
    background: transparent;
    border-radius: 40px;
    padding: 0;
    box-shadow: none;
}

.phone-screen {
    width: 100%;
    height: 100%;
    background: transparent;
    border-radius: 30px;
    overflow: hidden;
    position: relative;
}

.hero-logo-image {
    width: 100%;
    height: 100%;
    object-fit: contain;
    object-position: center;
    border-radius: 30px;
}

.preview-header {
    display: flex;
    align-items: center;
    gap: 12px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--bg-gray);
}

.preview-avatar {
    font-size: 2rem;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-light);
    border-radius: 12px;
}

.preview-info {
    flex: 1;
}

.preview-name {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.9rem;
}

.preview-status {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.preview-cards {
    display: flex;
    flex-direction: column;
    gap: 12px;
    flex: 1;
}

.preview-card {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px;
    border-radius: 16px;
    background: var(--bg-light);
}

.card-weight {
    background: linear-gradient(135deg, rgba(239, 68, 68, 0.1), rgba(239, 68, 68, 0.05));
}

.card-exercise {
    background: linear-gradient(135deg, rgba(109, 212, 126, 0.1), rgba(109, 212, 126, 0.05));
}

.card-diet {
    background: linear-gradient(135deg, rgba(255, 160, 122, 0.1), rgba(255, 160, 122, 0.05));
}

.card-icon {
    font-size: 1.5rem;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-white);
    border-radius: 12px;
}

.card-content {
    flex: 1;
}

.card-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-bottom: 4px;
}

.card-value {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 1rem;
}

.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    animation: bounce 2s infinite;
    z-index: 10;
    pointer-events: none;
}

.scroll-arrow {
    width: 24px;
    height: 40px;
    border: 2px solid rgba(62, 135, 163, 0.5);
    border-radius: 12px;
    position: relative;
}

.scroll-arrow::after {
    content: '';
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    width: 6px;
    height: 6px;
    background: rgba(62, 135, 163, 0.5);
    border-radius: 50%;
    animation: scrollDown 2s infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(-10px); }
}

@keyframes scrollDown {
    0% { opacity: 1; transform: translateX(-50%) translateY(0); }
    100% { opacity: 0; transform: translateX(-50%) translateY(20px); }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* ===== 功能特色 ===== */
.features {
    padding: var(--spacing-xl) 0;
    background: var(--bg-light);
}

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

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
}

/* 功能模块样式 */
.feature-module {
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-lg) 0;
}

.feature-module-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    align-items: center;
    max-width: 1100px;
    margin: 0 auto;
}

.feature-module-reverse .feature-module-content {
    direction: rtl;
}

.feature-module-reverse .feature-module-text,
.feature-module-reverse .feature-module-image {
    direction: ltr;
}

.feature-module-text {
    display: flex;
    flex-direction: column;
    opacity: 0;
    transform: translateX(-30px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.feature-module-reverse .feature-module-text {
    transform: translateX(30px);
}

.feature-module.animated .feature-module-text {
    opacity: 1;
    transform: translateX(0);
}

.feature-module-image {
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    opacity: 0;
    transform: translateX(30px);
    transition: opacity 0.8s ease 0.2s, transform 0.8s ease 0.2s;
}

.feature-module-reverse .feature-module-image {
    transform: translateX(-30px);
}

.feature-module.animated .feature-module-image {
    opacity: 1;
    transform: translateX(0);
}

.feature-screenshot {
    width: 100%;
    max-width: 350px;
    height: auto;
    border-radius: 24px;
    transition: all 0.3s ease;
}

.feature-screenshot:hover {
    transform: translateY(-8px) scale(1.02);
}

.feature-icon {
    width: 80px;
    height: 80px;
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-sm);
    color: var(--text-white);
}

.health-icon {
    background: linear-gradient(135deg, var(--health-weight), #FF6B6B);
}

.ai-icon {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
}

.community-icon {
    background: linear-gradient(135deg, var(--health-medical), #A855F7);
}

.weight-icon {
    background: linear-gradient(135deg, var(--health-weight), #FF6B6B);
}

.sync-icon {
    background: linear-gradient(135deg, var(--health-water), #06B6D4);
}

.feature-title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    line-height: 1.3;
}

.feature-description {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.8;
    font-size: 1.0625rem;
}

.feature-list {
    list-style: none;
    margin-top: var(--spacing-sm);
}

.feature-list li {
    padding: var(--spacing-xs) 0;
    padding-left: 28px;
    position: relative;
    color: var(--text-secondary);
    font-size: 1rem;
    line-height: 1.6;
}

.feature-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: 700;
    font-size: 1.125rem;
}

/* ===== 数据展示 ===== */
.stats {
    padding: var(--spacing-xl) 0;
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-mid));
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    text-align: center;
}

.stat-item {
    color: var(--text-white);
}

.stat-number {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
    opacity: 0;
    animation: fadeInUp 0.8s ease forwards;
    position: relative;
}

.stat-number::after {
    content: '+';
    margin-left: 0.2em;
}

.stat-number.stat-no-plus::after {
    content: '';
}

.stat-label {
    font-size: 1rem;
    opacity: 0.9;
}

/* ===== 关于我们 ===== */
.about {
    padding: var(--spacing-xl) 0;
    background: var(--bg-white);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    align-items: center;
}

.about-description {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: var(--spacing-sm);
}

.about-values {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.value-item {
    background: var(--bg-white);
    padding: var(--spacing-md);
    border-radius: 16px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
    transition: all 0.3s ease;
    border: 1px solid rgba(62, 135, 163, 0.1);
    position: relative;
    overflow: hidden;
}

.value-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: linear-gradient(180deg, var(--primary-color), var(--primary-light));
    opacity: 0;
    transition: opacity 0.3s ease;
}

.value-item:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
    border-color: rgba(62, 135, 163, 0.3);
}

.value-item:hover::before {
    opacity: 1;
}

.value-text {
    position: relative;
    z-index: 1;
}

.value-text h4 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
    position: relative;
    padding-left: var(--spacing-sm);
}

.value-text h4::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 3px;
    height: 20px;
    background: linear-gradient(180deg, var(--primary-color), var(--primary-light));
    border-radius: 2px;
}

.value-text p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.6;
    padding-left: var(--spacing-sm);
}

.about-visual {
    position: relative;
    width: 400px;
    height: 400px;
    margin: 0 auto;
}

.visual-circle {
    position: absolute;
    border-radius: 50%;
    animation: pulse 3s ease-in-out infinite;
}

.circle-1 {
    width: 300px;
    height: 300px;
    background: linear-gradient(135deg, rgba(62, 135, 163, 0.1), rgba(62, 135, 163, 0.05));
    top: 50px;
    left: 50px;
    animation-delay: 0s;
}

.circle-2 {
    width: 200px;
    height: 200px;
    background: linear-gradient(135deg, rgba(243, 164, 38, 0.15), rgba(243, 164, 38, 0.05));
    top: 100px;
    right: 0;
    animation-delay: 1s;
}

.circle-3 {
    width: 150px;
    height: 150px;
    background: linear-gradient(135deg, rgba(109, 212, 126, 0.1), rgba(109, 212, 126, 0.05));
    bottom: 50px;
    left: 0;
    animation-delay: 2s;
}

.visual-center {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 4rem;
    z-index: 10;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.1); opacity: 0.8; }
}

/* ===== 下载区域 ===== */
.download {
    padding: var(--spacing-xl) 0;
    background: linear-gradient(135deg, var(--bg-light), var(--bg-white));
}

.download-content {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.download-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.download-subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.download-buttons {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
    flex-wrap: wrap;
}

.download-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: 1rem 1.5rem;
    background: var(--bg-white);
    border-radius: 12px;
    text-decoration: none;
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
    min-width: 180px;
}

.download-btn:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.download-btn svg {
    color: var(--text-primary);
}

.btn-text {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.btn-label {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 1rem;
}

.btn-sublabel {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.download-qr {
    margin-top: var(--spacing-md);
}

.qr-code {
    display: inline-block;
    text-align: center;
}

.qr-placeholder {
    width: 150px;
    height: 150px;
    background: var(--bg-white);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-xs);
    box-shadow: var(--shadow-sm);
    color: var(--text-primary);
}

.qr-code p {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* ===== 页脚 ===== */
.footer {
    background: var(--text-primary);
    color: var(--text-white);
    padding: var(--spacing-xl) 0 var(--spacing-md);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-md);
}

.footer-logo {
    margin-bottom: var(--spacing-sm);
}

.footer-logo-img {
    max-width: 200px;
    width: 100%;
    height: auto;
}

.footer-brand .logo {
    color: var(--text-white);
    margin-bottom: var(--spacing-xs);
}

.footer-tagline {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.9rem;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
}

.footer-column h4 {
    margin-bottom: var(--spacing-sm);
    font-size: 1rem;
}

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

.footer-column ul li {
    margin-bottom: var(--spacing-xs);
}

.footer-column ul li a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: color 0.3s ease;
    font-size: 0.9rem;
}

.footer-column ul li a:hover {
    color: var(--text-white);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.875rem;
}

.footer-bottom p {
    margin-bottom: var(--spacing-xs);
}

.footer-bottom p:last-child {
    margin-bottom: 0;
}

.footer-icp {
    font-size: 0.75rem;
    color: rgba(255, 255, 255, 0.5);
    margin-top: var(--spacing-xs);
}

.footer-icp a {
    color: rgba(255, 255, 255, 0.5);
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-icp a:hover {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: underline;
}

/* ===== 响应式设计 ===== */
@media (max-width: 768px) {
    .mobile-menu-toggle {
        display: flex;
    }
    
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        flex-direction: column;
        background: var(--bg-white);
        width: 100%;
        padding: var(--spacing-md);
        box-shadow: var(--shadow-md);
        transition: left 0.3s ease;
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .lang-switcher {
        border-left: none;
        border-top: 1px solid rgba(0, 0, 0, 0.1);
        padding-top: var(--spacing-sm);
        margin-top: var(--spacing-sm);
        margin-left: 0;
        padding-left: 0;
        justify-content: center;
    }
    
    .hero {
        padding-bottom: 100px;
    }
    
    .hero-content {
        padding: 0 var(--spacing-sm);
        margin-bottom: 40px;
    }
    
    .hero-main-logo {
        max-width: 280px;
    }
    
    .title-main {
        font-size: 2rem;
    }
    
    .hero-description {
        font-size: 1rem;
    }
    
    .hero-features {
        gap: var(--spacing-xs);
    }
    
    .hero-feature-item {
        font-size: 0.85rem;
        padding: 0.5rem 1rem;
    }
    
    .shape-1 {
        width: 250px;
        height: 250px;
    }
    
    .shape-2 {
        width: 200px;
        height: 200px;
    }
    
    .shape-3 {
        width: 150px;
        height: 150px;
    }
    
    .footer-logo-img {
        max-width: 150px;
    }
    
    .logo-img {
        height: 32px;
    }
    
    .feature-module-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .feature-module-reverse .feature-module-content {
        direction: ltr;
    }
    
    .feature-module-image {
        order: -1;
    }
    
    .feature-screenshot {
        max-width: 280px;
    }
    
    .feature-title {
        font-size: 1.75rem;
    }
    
    .about-content {
        grid-template-columns: 1fr;
    }
    
    .about-values {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
    }
    
    .value-item {
        padding: var(--spacing-sm);
    }
    
    .about-visual {
        width: 300px;
        height: 300px;
    }
    
    .circle-1 {
        width: 200px;
        height: 200px;
    }
    
    .circle-2 {
        width: 150px;
        height: 150px;
    }
    
    .circle-3 {
        width: 100px;
        height: 100px;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
    
    .footer-links {
        grid-template-columns: 1fr;
    }
    
    .download-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .download-btn {
        width: 100%;
        max-width: 300px;
    }
}

@media (max-width: 480px) {
    .title-main {
        font-size: 2rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .download-title {
        font-size: 2rem;
    }
    
    .stat-number {
        font-size: 2rem;
    }
}