/* 现代化设计风格 - TXW365云存储 */

/* 全局变量 - 新配色方案 */
:root {
    /* 主色调 - 深蓝紫渐变 */
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --primary-color: #667eea;
    --primary-dark: #5568d3;
    --primary-light: #7c8ff0;
    
    /* 辅助色 */
    --accent-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --accent-color: #f5576c;
    --success-color: #00d4aa;
    --warning-color: #feca57;
    
    /* 背景色 - 深色主题 */
    --bg-primary: #0f0f23;
    --bg-secondary: #1a1a2e;
    --bg-card: #16213e;
    --bg-card-hover: #1f2b4a;
    
    /* 文字颜色 */
    --text-primary: #ffffff;
    --text-secondary: #a8b2d1;
    --text-muted: #6b7280;
    
    /* 边框和阴影 */
    --border-color: rgba(255, 255, 255, 0.1);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 20px rgba(102, 126, 234, 0.4);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

/* 背景动画效果 */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 20% 30%, rgba(102, 126, 234, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 80% 70%, rgba(118, 75, 162, 0.15) 0%, transparent 50%);
    pointer-events: none;
    z-index: 0;
}

/* 容器 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    position: relative;
    z-index: 1;
}

/* 现代化按钮 */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    border-radius: 12px;
    font-weight: 600;
    font-size: 15px;
    text-decoration: none;
    border: none;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.2);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn:hover::before {
    width: 300px;
    height: 300px;
}

.btn-primary {
    background: var(--primary-gradient);
    color: white;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.6);
}

.btn-accent {
    background: var(--accent-gradient);
    color: white;
    box-shadow: 0 4px 15px rgba(245, 87, 108, 0.4);
}

.btn-accent:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(245, 87, 108, 0.6);
}

.btn-outline {
    background: transparent;
    color: var(--text-primary);
    border: 2px solid var(--border-color);
    backdrop-filter: blur(10px);
}

.btn-outline:hover {
    border-color: var(--primary-color);
    background: rgba(102, 126, 234, 0.1);
}

.btn-large {
    padding: 16px 40px;
    font-size: 17px;
}

/* 玻璃态卡片 */
.glass-card {
    background: rgba(22, 33, 62, 0.6);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 30px;
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
}

.glass-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(102, 126, 234, 0.5);
}

/* 头部导航 - 现代化设计 */
header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(15, 15, 35, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

header.scrolled {
    background: rgba(15, 15, 35, 0.95);
    box-shadow: var(--shadow-md);
}

.header-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 30px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 24px;
    font-weight: 700;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo i {
    font-size: 32px;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.main-nav {
    display: flex;
    align-items: center;
    gap: 40px;
}

.main-nav a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: 15px;
    transition: all 0.3s ease;
    position: relative;
}

.main-nav a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-gradient);
    transition: width 0.3s ease;
}

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

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

/* Hero区域 - 全新设计 */
.hero {
    margin-top: 80px;
    min-height: 600px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    padding: 100px 20px;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(102, 126, 234, 0.2) 0%, transparent 70%);
    animation: float 20s ease-in-out infinite;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: -50%;
    left: -20%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(118, 75, 162, 0.2) 0%, transparent 70%);
    animation: float 15s ease-in-out infinite reverse;
}

@keyframes float {
    0%, 100% {
        transform: translate(0, 0) rotate(0deg);
    }
    50% {
        transform: translate(50px, 50px) rotate(180deg);
    }
}

.hero-content {
    max-width: 800px;
    text-align: center;
    position: relative;
    z-index: 1;
}

.hero h1 {
    font-size: 64px;
    font-weight: 800;
    margin-bottom: 24px;
    background: linear-gradient(135deg, #ffffff 0%, #a8b2d1 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    line-height: 1.2;
    animation: fadeInUp 0.8s ease;
}

.hero-subtitle {
    font-size: 28px;
    color: var(--text-secondary);
    margin-bottom: 16px;
    animation: fadeInUp 0.8s ease 0.2s both;
}

.hero-desc {
    font-size: 18px;
    color: var(--text-muted);
    margin-bottom: 40px;
    animation: fadeInUp 0.8s ease 0.4s both;
}

.hero-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
    animation: fadeInUp 0.8s ease 0.6s both;
}

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

/* 特色功能区 - 网格布局 */
.features-section {
    padding: 100px 20px;
    position: relative;
}

.section-title {
    font-size: 48px;
    font-weight: 700;
    text-align: center;
    margin-bottom: 16px;
    background: linear-gradient(135deg, #ffffff 0%, #a8b2d1 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.section-subtitle {
    font-size: 18px;
    color: var(--text-secondary);
    text-align: center;
    margin-bottom: 60px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.feature-card {
    background: rgba(22, 33, 62, 0.6);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: 24px;
    padding: 40px;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--primary-gradient);
    opacity: 0;
    transition: opacity 0.4s ease;
}

.feature-card:hover {
    transform: translateY(-10px);
    border-color: var(--primary-color);
    box-shadow: 0 20px 40px rgba(102, 126, 234, 0.3);
}

.feature-card:hover::before {
    opacity: 0.05;
}

.feature-icon {
    width: 80px;
    height: 80px;
    background: var(--primary-gradient);
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
    position: relative;
    z-index: 1;
}

.feature-icon i {
    font-size: 36px;
    color: white;
}

.feature-card h3 {
    font-size: 24px;
    margin-bottom: 16px;
    color: var(--text-primary);
    position: relative;
    z-index: 1;
}

.feature-card p {
    color: var(--text-secondary);
    line-height: 1.8;
    position: relative;
    z-index: 1;
}

/* 价格卡片 - 3D效果 */
.pricing-section {
    padding: 100px 20px;
    background: var(--bg-secondary);
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 40px;
    perspective: 1000px;
}

.pricing-card {
    background: rgba(22, 33, 62, 0.8);
    backdrop-filter: blur(20px);
    border: 2px solid var(--border-color);
    border-radius: 30px;
    padding: 50px 40px;
    text-align: center;
    transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    transform-style: preserve-3d;
}

.pricing-card::before {
    content: '';
    position: absolute;
    top: -2px;
    left: -2px;
    right: -2px;
    bottom: -2px;
    background: var(--primary-gradient);
    border-radius: 30px;
    opacity: 0;
    transition: opacity 0.5s ease;
    z-index: -1;
}

.pricing-card:hover {
    transform: translateY(-15px) rotateX(5deg);
    box-shadow: 0 30px 60px rgba(0, 0, 0, 0.5);
}

.pricing-card:hover::before {
    opacity: 1;
}

.pricing-card.featured {
    border-color: var(--primary-color);
    transform: scale(1.05);
}

.pricing-card.featured::before {
    opacity: 0.3;
}

.pricing-badge {
    display: inline-block;
    padding: 8px 20px;
    background: var(--accent-gradient);
    color: white;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 20px;
}

.pricing-card h3 {
    font-size: 28px;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.pricing-price {
    margin-bottom: 30px;
}

.pricing-price .amount {
    font-size: 56px;
    font-weight: 800;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.pricing-price .currency {
    font-size: 24px;
    color: var(--text-secondary);
}

.pricing-price .period {
    font-size: 18px;
    color: var(--text-muted);
}

.pricing-features {
    list-style: none;
    margin-bottom: 30px;
    text-align: left;
}

.pricing-features li {
    padding: 12px 0;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 12px;
}

.pricing-features i {
    color: var(--success-color);
    font-size: 18px;
}

/* 视频卡片 - 悬浮效果 */
.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 30px;
}

.video-card {
    background: rgba(22, 33, 62, 0.6);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    overflow: hidden;
    transition: all 0.4s ease;
    cursor: pointer;
}

.video-card:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.5);
    border-color: var(--primary-color);
}

.video-thumbnail {
    position: relative;
    width: 100%;
    padding-top: 56.25%;
    overflow: hidden;
    background: #000;
}

.video-thumbnail img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}

.video-card:hover .video-thumbnail img {
    transform: scale(1.1);
}

.video-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.9) 0%, rgba(118, 75, 162, 0.9) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.video-card:hover .video-overlay {
    opacity: 1;
}

.video-overlay i {
    font-size: 64px;
    color: white;
}

.video-info {
    padding: 24px;
}

.video-info h3 {
    font-size: 18px;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.video-info p {
    color: var(--text-secondary);
    font-size: 14px;
}

/* Footer - 现代化 */
footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 80px 20px 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 50px;
    margin-bottom: 50px;
}

.footer-section h4 {
    font-size: 20px;
    margin-bottom: 24px;
    color: var(--text-primary);
}

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

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

.footer-section a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: all 0.3s ease;
}

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

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 40px;
    }
    
    .hero-subtitle {
        font-size: 20px;
    }
    
    .section-title {
        font-size: 32px;
    }
    
    .features-grid,
    .pricing-grid,
    .video-grid {
        grid-template-columns: 1fr;
    }
    
    .main-nav {
        display: none;
    }
}

/* 加载动画 */
@keyframes shimmer {
    0% {
        background-position: -1000px 0;
    }
    100% {
        background-position: 1000px 0;
    }
}

.loading {
    animation: shimmer 2s infinite;
    background: linear-gradient(to right, transparent 0%, rgba(255,255,255,0.1) 50%, transparent 100%);
    background-size: 1000px 100%;
}


/* 移动端菜单 */
.mobile-menu-btn {
    display: none;
    font-size: 28px;
    color: var(--text-primary);
    cursor: pointer;
    background: none;
    border: none;
}

.mobile-menu {
    display: none;
    position: fixed;
    top: 80px;
    left: 0;
    right: 0;
    background: rgba(15, 15, 35, 0.98);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    z-index: 999;
    padding: 20px;
    flex-direction: column;
    gap: 10px;
    max-height: calc(100vh - 80px);
    overflow-y: auto;
}

.mobile-menu.active {
    display: flex;
}

.mobile-menu a {
    padding: 16px 20px;
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: 12px;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 12px;
}

.mobile-menu a:hover {
    background: rgba(102, 126, 234, 0.1);
    color: var(--text-primary);
}

.mobile-menu .btn-nav {
    margin-top: 10px;
}

/* VIP状态显示 */
.vip-status {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: linear-gradient(135deg, rgba(255, 215, 0, 0.2) 0%, rgba(255, 165, 0, 0.2) 100%);
    border: 1px solid rgba(255, 215, 0, 0.4);
    border-radius: 20px;
    color: #ffd700;
    font-size: 14px;
    font-weight: 600;
}

.vip-status i {
    font-size: 16px;
}

.btn-nav {
    background: var(--primary-gradient);
    color: white !important;
    padding: 10px 24px;
    border-radius: 12px;
    transition: all 0.3s ease;
    font-weight: 600;
}

.btn-nav:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.6);
}

/* 响应式优化 */
@media (max-width: 1024px) {
    .header-container {
        padding: 0 20px;
    }
    
    .main-nav {
        gap: 24px;
    }
}

@media (max-width: 768px) {
    .main-nav {
        display: none;
    }
    
    .mobile-menu-btn {
        display: block;
    }
    
    .hero h1 {
        font-size: 40px;
    }
    
    .hero-subtitle {
        font-size: 20px;
    }
    
    .section-title {
        font-size: 32px;
    }
    
    .features-grid,
    .pricing-grid,
    .video-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
    
    /* 关于我们响应式 */
    #about > .container > div:first-of-type {
        grid-template-columns: 1fr !important;
    }
}

@media (max-width: 480px) {
    .hero {
        padding: 60px 20px;
    }
    
    .hero h1 {
        font-size: 32px;
    }
    
    .hero-subtitle {
        font-size: 18px;
    }
    
    .hero-desc {
        font-size: 16px;
    }
    
    .btn-large {
        padding: 14px 28px;
        font-size: 15px;
    }
    
    .section-title {
        font-size: 28px;
    }
    
    .pricing-price .amount {
        font-size: 48px;
    }
    
    .feature-card {
        padding: 30px 20px;
    }
}

/* 滚动条美化 */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
    background: var(--primary-gradient);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-dark);
}

/* 平滑滚动 */
html {
    scroll-behavior: smooth;
}

/* 选中文本样式 */
::selection {
    background: rgba(102, 126, 234, 0.3);
    color: var(--text-primary);
}

/* 链接悬停效果 */
a {
    transition: all 0.3s ease;
}

/* 图片加载优化 */
img {
    max-width: 100%;
    height: auto;
}

/* 按钮禁用状态 */
.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
}

/* 加载动画 */
.loading-spinner {
    width: 40px;
    height: 40px;
    border: 4px solid rgba(102, 126, 234, 0.2);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* 工具提示 */
.tooltip {
    position: relative;
    display: inline-block;
}

.tooltip .tooltiptext {
    visibility: hidden;
    background: rgba(22, 33, 62, 0.95);
    color: var(--text-primary);
    text-align: center;
    border-radius: 8px;
    padding: 8px 12px;
    position: absolute;
    z-index: 1;
    bottom: 125%;
    left: 50%;
    transform: translateX(-50%);
    opacity: 0;
    transition: opacity 0.3s;
    font-size: 14px;
    white-space: nowrap;
    border: 1px solid var(--border-color);
}

.tooltip:hover .tooltiptext {
    visibility: visible;
    opacity: 1;
}

/* 徽章样式 */
.badge {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 600;
}

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

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

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

/* 分隔线 */
.divider {
    height: 1px;
    background: var(--border-color);
    margin: 40px 0;
}

/* 文本渐变效果 */
.gradient-text {
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* 脉冲动画 */
@keyframes pulse-glow {
    0%, 100% {
        box-shadow: 0 0 20px rgba(102, 126, 234, 0.4);
    }
    50% {
        box-shadow: 0 0 40px rgba(102, 126, 234, 0.8);
    }
}

.pulse-glow {
    animation: pulse-glow 2s ease-in-out infinite;
}