/* ================================
   抖音代刷服务 - 第八版蓝色专业主题
   设计理念：专业、现代、可靠、科技感
   ================================ */

/* CSS 重置和基础样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* CSS 变量定义 */
:root {
    /* 蓝色专业主题色彩 */
    --primary-blue-dark: #1e3a8a;
    --primary-blue: #3b82f6;
    --primary-blue-light: #60a5fa;
    --accent-cyan: #22d3ee;
    --background-gradient: linear-gradient(135deg, #1e3a8a 0%, #3b82f6 100%);
    
    /* 中性色彩 */
    --white: #ffffff;
    --light-gray: #e5e7eb;
    --medium-gray: #9ca3af;
    --dark-blue-gray: #0f172a;
    --shadow-color: rgba(0, 0, 0, 0.25);
    --glow-color: rgba(255, 255, 255, 0.2);
    
    /* 字体系统 */
    --font-primary: 'Inter', 'SF Pro Display', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
    --font-display: 'SF Pro Display', 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    
    /* 间距系统 */
    --spacing-xs: 8px;
    --spacing-sm: 16px;
    --spacing-md: 24px;
    --spacing-lg: 32px;
    --spacing-xl: 48px;
    --spacing-2xl: 64px;
    --spacing-3xl: 96px;
    
    /* 阴影系统 */
    --shadow-sm: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 10px 25px var(--shadow-color);
    --shadow-lg: 0 15px 35px rgba(0, 0, 0, 0.35);
    --shadow-glow: 0 0 15px var(--glow-color);
    
    /* 边框半径 */
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    
    /* 过渡效果 */
    --transition-fast: all 0.2s cubic-bezier(0.25, 0.8, 0.25, 1);
    --transition-smooth: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    --transition-elastic: all 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    
    /* 动画持续时间 */
    --animation-slow: 3s;
    --animation-medium: 2s;
    --animation-fast: 1s;
}

/* 基础HTML样式 */
html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-primary);
    font-weight: 400;
    line-height: 1.6;
    color: var(--white);
    background: var(--background-gradient);
    overflow-x: hidden;
    position: relative;
    min-height: 100vh;
}

/* 粒子背景容器 */
.particles-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: -3;
    background: transparent;
}

.particles-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        radial-gradient(2px 2px at 20px 30px, var(--white), transparent),
        radial-gradient(2px 2px at 40px 70px, var(--primary-blue-light), transparent),
        radial-gradient(1px 1px at 90px 40px, var(--accent-cyan), transparent),
        radial-gradient(1px 1px at 130px 80px, var(--white), transparent),
        radial-gradient(2px 2px at 160px 30px, var(--primary-blue-light), transparent);
    background-repeat: repeat;
    background-size: 200px 100px;
    animation: particleFloat var(--animation-slow) ease-in-out infinite;
    opacity: 0.6;
}

/* 几何背景图案 */
.geometric-background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: -2;
    overflow: hidden;
}

.geo-grid {
    position: absolute;
    top: 0;
    left: 0;
    width: 120%;
    height: 120%;
    background-image: 
        linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px),
        linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px);
    background-size: 50px 50px;
    animation: gridMove var(--animation-slow) ease-in-out infinite;
}

.light-beam {
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(
        45deg, 
        transparent 40%, 
        rgba(255, 255, 255, 0.02) 45%, 
        rgba(255, 255, 255, 0.05) 50%, 
        rgba(255, 255, 255, 0.02) 55%, 
        transparent 60%
    );
    animation: lightSweep 8s ease-in-out infinite;
}

.floating-elements {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.float-element {
    position: absolute;
    background: linear-gradient(135deg, var(--primary-blue-light), var(--accent-cyan));
    border-radius: 50%;
    opacity: 0.1;
    animation: elementFloat var(--animation-slow) ease-in-out infinite;
}

.element-1 {
    width: 80px;
    height: 80px;
    top: 10%;
    left: 10%;
    animation-delay: 0s;
    animation-duration: 4s;
}

.element-2 {
    width: 120px;
    height: 120px;
    top: 20%;
    right: 15%;
    animation-delay: 1s;
    animation-duration: 5s;
}

.element-3 {
    width: 60px;
    height: 60px;
    bottom: 30%;
    left: 20%;
    animation-delay: 2s;
    animation-duration: 3.5s;
}

.element-4 {
    width: 100px;
    height: 100px;
    bottom: 20%;
    right: 20%;
    animation-delay: 0.5s;
    animation-duration: 4.5s;
}

.element-5 {
    width: 40px;
    height: 40px;
    top: 50%;
    left: 50%;
    animation-delay: 1.5s;
    animation-duration: 3s;
}

/* 渐变波浪背景 */
.wave-background {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 300px;
    pointer-events: none;
    z-index: -1;
    overflow: hidden;
}

.wave {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.wave-1 {
    animation: waveMove 8s ease-in-out infinite;
}

.wave-2 {
    animation: waveMove 6s ease-in-out infinite reverse;
    animation-delay: 1s;
}

.wave-3 {
    animation: waveMove 10s ease-in-out infinite;
    animation-delay: 2s;
}

/* 导航栏样式 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(15, 23, 42, 0.9);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    z-index: 1000;
    transition: var(--transition-smooth);
}

.nav-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

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

.nav-logo {
    width: 40px;
    height: 40px;
    filter: brightness(0) invert(1);
}

.brand-name {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--white);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.nav-link {
    color: var(--light-gray);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition-smooth);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-blue);
    transition: var(--transition-smooth);
}

.nav-link:hover {
    color: var(--white);
}

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

.nav-cta {
    background: var(--background-gradient);
    color: var(--white);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-md);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition-smooth);
    box-shadow: var(--shadow-sm);
}

.nav-cta:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    cursor: pointer;
    padding: var(--spacing-xs);
}

.mobile-menu-toggle span {
    width: 25px;
    height: 3px;
    background: var(--white);
    transition: var(--transition-smooth);
    border-radius: 2px;
}

/* 主要内容区域 */
.main-content {
    position: relative;
    z-index: 1;
    margin-top: 70px;
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* 英雄区域样式 */
.hero-section {
    padding: var(--spacing-3xl) 0;
    text-align: center;
    position: relative;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
    animation: heroFadeIn 1s ease-out;
}

.hero-logo {
    position: relative;
    margin-bottom: var(--spacing-xl);
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.hero-logo-img {
    width: 120px;
    height: 120px;
    filter: brightness(0) invert(1);
    animation: logoFloat var(--animation-medium) ease-in-out infinite;
    position: relative;
    z-index: 2;
}

.logo-glow-effect {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 140px;
    height: 140px;
    background: radial-gradient(circle, var(--primary-blue) 0%, transparent 70%);
    border-radius: 50%;
    opacity: 0.3;
    animation: glowPulse var(--animation-slow) ease-in-out infinite;
    z-index: 1;
}

.hero-title {
    font-family: var(--font-display);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    line-height: 1.2;
}

.title-line-1 {
    display: block;
    font-size: clamp(2rem, 5vw, 3.75rem);
    color: var(--white);
    margin-bottom: var(--spacing-xs);
}

.title-line-2 {
    display: block;
    font-size: clamp(1.5rem, 4vw, 2.5rem);
    color: var(--primary-blue-light);
    font-weight: 600;
}

.hero-subtitle {
    font-size: clamp(1rem, 2vw, 1.25rem);
    color: var(--light-gray);
    margin-bottom: var(--spacing-xl);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

/* 按钮样式 */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-md) var(--spacing-xl);
    font-family: var(--font-primary);
    font-weight: 600;
    font-size: 1.125rem;
    text-decoration: none;
    border-radius: var(--radius-md);
    transition: var(--transition-elastic);
    position: relative;
    overflow: hidden;
    min-width: 180px;
    justify-content: center;
    cursor: pointer;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.6s ease;
}

.btn:hover::before {
    left: 100%;
}

.btn-primary {
    background: var(--background-gradient);
    color: var(--white);
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.1);
    color: var(--white);
    border: 2px solid var(--primary-blue-light);
    box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
    transform: translateY(-3px);
    background: var(--primary-blue-light);
    box-shadow: var(--shadow-lg);
}

.btn-arrow,
.btn-icon {
    font-size: 1.25rem;
    transition: var(--transition-smooth);
}

.btn:hover .btn-arrow {
    transform: translateX(5px);
}

.btn:hover .btn-icon {
    animation: iconBounce 0.6s ease-in-out;
}

/* 套餐区域样式 */
.packages-section {
    padding: var(--spacing-3xl) 0;
    position: relative;
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.section-title {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(2rem, 4vw, 2.5rem);
    color: var(--white);
    margin-bottom: var(--spacing-md);
}

.section-subtitle {
    font-size: clamp(1rem, 2vw, 1.125rem);
    color: var(--light-gray);
    max-width: 600px;
    margin: 0 auto;
}

.packages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-xl);
    max-width: 1200px;
    margin: 0 auto;
}

/* 套餐卡片样式 */
.package-card {
    background: rgba(15, 23, 42, 0.7);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    position: relative;
    transition: var(--transition-smooth);
    border: 1px solid rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    overflow: hidden;
}

.package-glow {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--background-gradient);
    opacity: 0;
    transition: var(--transition-smooth);
}

.package-card:hover .package-glow {
    opacity: 1;
}

.package-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-blue-light);
}

.popular-package {
    border-color: var(--accent-cyan);
    box-shadow: 0 0 30px rgba(34, 211, 238, 0.3);
}

.popular-badge {
    position: absolute;
    top: -1px;
    right: var(--spacing-md);
    background: var(--accent-cyan);
    color: var(--dark-blue-gray);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: 0 0 var(--radius-md) var(--radius-md);
    font-weight: 700;
    font-size: 0.875rem;
    z-index: 10;
}

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

.package-title {
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 1.5rem;
    color: var(--white);
    margin-bottom: var(--spacing-sm);
}

.package-price {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: 4px;
    margin-bottom: var(--spacing-sm);
}

.price-currency {
    font-size: 1.5rem;
    color: var(--primary-blue-light);
    font-weight: 600;
}

.price-amount {
    font-family: var(--font-display);
    font-size: clamp(2rem, 4vw, 2.5rem);
    font-weight: 700;
    color: var(--white);
}

.package-description {
    color: var(--light-gray);
    font-size: 0.95rem;
}

.package-features {
    margin-bottom: var(--spacing-xl);
}

.feature-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.feature-item:last-child {
    border-bottom: none;
}

.feature-icon {
    font-size: 1.5rem;
    width: 40px;
    text-align: center;
}

.feature-text {
    flex: 1;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.feature-name {
    color: var(--light-gray);
    font-size: 0.95rem;
}

.feature-value {
    color: var(--white);
    font-weight: 600;
    font-size: 0.95rem;
}

.package-footer {
    text-align: center;
}

.package-btn {
    display: inline-block;
    width: 100%;
    padding: var(--spacing-md);
    background: var(--background-gradient);
    color: var(--white);
    text-decoration: none;
    border-radius: var(--radius-md);
    font-weight: 600;
    transition: var(--transition-smooth);
    box-shadow: var(--shadow-sm);
}

.package-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

.featured-btn {
    background: linear-gradient(135deg, var(--accent-cyan), var(--primary-blue));
}

/* 友情链接区域样式 */
.links-section {
    padding: var(--spacing-3xl) 0;
    position: relative;
}

.links-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
    max-width: 1000px;
    margin: 0 auto;
}

.link-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    background: rgba(15, 23, 42, 0.5);
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    transition: var(--transition-smooth);
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.link-item:hover {
    transform: translateY(-4px);
    background: rgba(15, 23, 42, 0.8);
    border-color: var(--primary-blue-light);
    box-shadow: var(--shadow-md);
}

.link-icon {
    flex-shrink: 0;
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--background-gradient);
    border-radius: var(--radius-md);
}

.link-icon-img {
    width: 24px;
    height: 24px;
    filter: brightness(0) invert(1);
}

.icon-placeholder {
    font-size: 1.5rem;
    color: var(--white);
}

.link-content {
    flex: 1;
}

.link-title {
    font-weight: 600;
    color: var(--white);
    margin-bottom: 4px;
    font-size: 1rem;
}

.link-url {
    color: var(--primary-blue-light);
    text-decoration: none;
    font-size: 0.9rem;
    transition: var(--transition-smooth);
}

.link-url:hover {
    color: var(--accent-cyan);
}

/* 页脚样式 */
.footer {
    background: rgba(15, 23, 42, 0.9);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding: var(--spacing-xl) 0;
    text-align: center;
}

.footer-content {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.footer-info {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.copyright {
    color: var(--medium-gray);
    font-size: 0.875rem;
}

.timestamp {
    color: var(--light-gray);
    font-size: 0.875rem;
    font-weight: 500;
}

/* 动画关键帧 */
@keyframes particleFloat {
    0%, 100% {
        transform: translateY(0px) rotate(0deg);
        opacity: 0.6;
    }
    50% {
        transform: translateY(-20px) rotate(180deg);
        opacity: 1;
    }
}

@keyframes gridMove {
    0%, 100% {
        transform: translate(0, 0);
    }
    50% {
        transform: translate(-25px, -25px);
    }
}

@keyframes lightSweep {
    0% {
        transform: translateX(-100%) rotate(45deg);
    }
    100% {
        transform: translateX(100%) rotate(45deg);
    }
}

@keyframes elementFloat {
    0%, 100% {
        transform: translateY(0px) scale(1);
        opacity: 0.1;
    }
    50% {
        transform: translateY(-30px) scale(1.1);
        opacity: 0.2;
    }
}

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

@keyframes heroFadeIn {
    0% {
        opacity: 0;
        transform: translateY(30px);
    }
    100% {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes logoFloat {
    0%, 100% {
        transform: translateY(0px) rotate(0deg);
    }
    50% {
        transform: translateY(-10px) rotate(5deg);
    }
}

@keyframes glowPulse {
    0%, 100% {
        opacity: 0.3;
        transform: translate(-50%, -50%) scale(1);
    }
    50% {
        opacity: 0.6;
        transform: translate(-50%, -50%) scale(1.1);
    }
}

@keyframes iconBounce {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-5px);
    }
}

/* 响应式设计 */
@media (max-width: 768px) {
    :root {
        --spacing-xl: 32px;
        --spacing-2xl: 48px;
        --spacing-3xl: 64px;
    }
    
    .nav-links {
        position: fixed;
        top: 70px;
        left: 0;
        width: 100%;
        height: calc(100vh - 70px);
        background: rgba(15, 23, 42, 0.95);
        backdrop-filter: blur(10px);
        flex-direction: column;
        justify-content: flex-start;
        align-items: center;
        padding-top: var(--spacing-xl);
        transform: translateX(-100%);
        transition: var(--transition-smooth);
    }
    
    .nav-links.active {
        transform: translateX(0);
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .mobile-menu-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }
    
    .mobile-menu-toggle.active span:nth-child(2) {
        opacity: 0;
    }
    
    .mobile-menu-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -6px);
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .btn {
        width: 100%;
        max-width: 300px;
    }
    
    .packages-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .links-grid {
        grid-template-columns: 1fr;
    }
    
    .link-item {
        flex-direction: column;
        text-align: center;
        gap: var(--spacing-sm);
    }
    
    .footer-info {
        gap: var(--spacing-sm);
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .hero-logo-img {
        width: 80px;
        height: 80px;
    }
    
    .logo-glow-effect {
        width: 100px;
        height: 100px;
    }
    
    .package-card {
        padding: var(--spacing-md);
    }
    
    .btn {
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: 1rem;
        min-width: 160px;
    }
    
    .floating-elements .float-element {
        display: none;
    }
}

/* 高分辨率显示器优化 */
@media (min-width: 1400px) {
    .container {
        max-width: 1400px;
    }
    
    .packages-grid {
        grid-template-columns: repeat(3, 1fr);
        max-width: 1300px;
    }
    
    .hero-logo-img {
        width: 140px;
        height: 140px;
    }
    
    .logo-glow-effect {
        width: 160px;
        height: 160px;
    }
}

/* 打印样式 */
@media print {
    .particles-container,
    .geometric-background,
    .wave-background,
    .navbar,
    .floating-elements {
        display: none;
    }
    
    .main-content {
        margin-top: 0;
    }
    
    * {
        animation: none !important;
        transition: none !important;
    }
    
    .hero-title,
    .section-title,
    .package-title {
        color: #333 !important;
    }
    
    .btn,
    .package-btn {
        background: #f0f0f0 !important;
        color: #333 !important;
        box-shadow: none !important;
    }
}

/* 减少动画（用户偏好设置） */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    .particles-container,
    .geometric-background,
    .floating-elements {
        display: none;
    }
    
    .btn:hover,
    .package-card:hover,
    .link-item:hover {
        transform: none;
    }
}