/* Proton VPN 官方网站样式 */
:root {
    --primary-purple: #6D4AFF;
    --primary-green: #0ED3CF;
    --bg-light: #FFFFFF;
    --bg-gray: #F8F9FA;
    --text-dark: #1A1A2E;
    --text-light: #FFFFFF;
    --shadow: 0 4px 20px rgba(0,0,0,0.08);
    --shadow-hover: 0 8px 30px rgba(109, 74, 255, 0.15);
    --transition: all 0.3s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-dark);
    background: var(--bg-light);
}

/* 导航栏 */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    z-index: 1000;
    transition: var(--transition);
    border-bottom: 1px solid transparent;
}

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

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 24px;
    font-weight: 700;
    color: var(--primary-purple);
    text-decoration: none;
    transition: var(--transition);
}

.logo:hover {
    transform: scale(1.02);
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary-purple), var(--primary-green));
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 800;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 32px;
    list-style: none;
}

.nav-item {
    position: relative;
}

.nav-link {
    color: var(--text-dark);
    text-decoration: none;
    font-weight: 500;
    font-size: 15px;
    transition: var(--transition);
    padding: 8px 0;
}

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

.nav-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

.btn {
    padding: 12px 24px;
    border-radius: 8px;
    font-weight: 600;
    font-size: 15px;
    text-decoration: none;
    transition: var(--transition);
    cursor: pointer;
    border: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--primary-purple);
    color: var(--primary-purple);
}

.btn-outline:hover {
    background: var(--primary-purple);
    color: white;
    transform: translateY(-2px);
}

.btn-primary {
    background: var(--primary-green);
    color: white;
    box-shadow: 0 4px 15px rgba(14, 211, 207, 0.3);
}

.btn-primary:hover {
    background: #0bb8b5;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(14, 211, 207, 0.4);
}

.btn-large {
    padding: 16px 32px;
    font-size: 17px;
}

/* 移动端菜单 */
.mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 8px;
}

.mobile-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text-dark);
    transition: var(--transition);
}

/* Hero 区域 */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 120px 24px 80px;
    background: linear-gradient(135deg, #f8f9ff 0%, #f0f4ff 100%);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 80%;
    height: 200%;
    background: radial-gradient(ellipse, rgba(109, 74, 255, 0.05) 0%, transparent 70%);
    animation: pulse 8s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 0.5; }
    50% { transform: scale(1.1); opacity: 0.8; }
}

.hero-container {
    max-width: 1400px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-content {
    animation: fadeInUp 0.8s ease;
}

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

.hero-badge {
    display: inline-block;
    background: rgba(109, 74, 255, 0.1);
    color: var(--primary-purple);
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 24px;
}

.hero-title {
    font-size: 56px;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 24px;
    color: var(--text-dark);
}

.hero-title span {
    background: linear-gradient(135deg, var(--primary-purple), var(--primary-green));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 20px;
    color: #666;
    margin-bottom: 32px;
    line-height: 1.6;
}

.hero-trust {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 32px;
    flex-wrap: wrap;
}

.trust-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    color: #666;
}

.trust-item svg {
    color: var(--primary-green);
}

.hero-actions {
    display: flex;
    gap: 16px;
    margin-bottom: 48px;
    flex-wrap: wrap;
}

.hero-stats {
    display: flex;
    gap: 40px;
    flex-wrap: wrap;
}

.stat-item {
    text-align: center;
}

.stat-number {
    font-size: 32px;
    font-weight: 700;
    color: var(--primary-purple);
    display: block;
}

.stat-label {
    font-size: 14px;
    color: #666;
}

/* VPN 模拟器 */
.hero-visual {
    position: relative;
    animation: fadeInRight 0.8s ease 0.2s both;
}

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

.vpn-simulator {
    background: linear-gradient(145deg, #1a1a2e, #2d2d44);
    border-radius: 24px;
    padding: 32px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    position: relative;
    overflow: hidden;
}

.vpn-simulator::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-purple), var(--primary-green));
}

.simulator-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 24px;
}

.simulator-title {
    color: white;
    font-size: 18px;
    font-weight: 600;
}

.simulator-status {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--primary-green);
    font-size: 14px;
    font-weight: 500;
}

.status-dot {
    width: 8px;
    height: 8px;
    background: var(--primary-green);
    border-radius: 50%;
    animation: blink 2s ease-in-out infinite;
}

@keyframes blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.simulator-map {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 16px;
    padding: 24px;
    margin-bottom: 24px;
    position: relative;
    min-height: 200px;
}

.map-world {
    width: 100%;
    height: 180px;
    position: relative;
}

.map-dot {
    position: absolute;
    width: 12px;
    height: 12px;
    background: var(--primary-green);
    border-radius: 50%;
    box-shadow: 0 0 20px var(--primary-green);
    animation: mapPulse 2s ease-in-out infinite;
}

.map-dot::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 24px;
    height: 24px;
    border: 2px solid var(--primary-green);
    border-radius: 50%;
    opacity: 0;
    animation: ripple 2s ease-out infinite;
}

@keyframes mapPulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.2); }
}

@keyframes ripple {
    0% { width: 12px; height: 12px; opacity: 1; }
    100% { width: 40px; height: 40px; opacity: 0; }
}

.map-dot:nth-child(1) { top: 30%; left: 20%; animation-delay: 0s; }
.map-dot:nth-child(2) { top: 40%; left: 50%; animation-delay: 0.5s; }
.map-dot:nth-child(3) { top: 25%; left: 75%; animation-delay: 1s; }
.map-dot:nth-child(4) { top: 60%; left: 35%; animation-delay: 1.5s; }

.map-line {
    position: absolute;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--primary-green), transparent);
    transform-origin: left center;
    animation: lineFlow 3s linear infinite;
}

@keyframes lineFlow {
    0% { opacity: 0; transform: scaleX(0); }
    50% { opacity: 1; transform: scaleX(1); }
    100% { opacity: 0; transform: scaleX(1); }
}

.simulator-info {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}

.info-item {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 12px;
    padding: 16px;
    text-align: center;
}

.info-label {
    color: rgba(255, 255, 255, 0.6);
    font-size: 12px;
    margin-bottom: 4px;
}

.info-value {
    color: white;
    font-size: 18px;
    font-weight: 600;
}

.info-value.green {
    color: var(--primary-green);
}

/* 通用区块 */
.section {
    padding: 100px 24px;
}

.section-gray {
    background: var(--bg-gray);
}

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

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-title {
    font-size: 42px;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--text-dark);
}

.section-subtitle {
    font-size: 18px;
    color: #666;
    max-width: 600px;
    margin: 0 auto;
}

/* 价值主张卡片 */
.value-cards {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.value-card {
    background: white;
    border-radius: 16px;
    padding: 32px 24px;
    text-align: center;
    transition: var(--transition);
    border: 1px solid #eee;
}

.value-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-hover);
    border-color: var(--primary-purple);
}

.value-icon {
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, rgba(109, 74, 255, 0.1), rgba(14, 211, 207, 0.1));
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    margin: 0 auto 20px;
}

.value-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-dark);
}

.value-desc {
    font-size: 14px;
    color: #666;
    line-height: 1.6;
}

/* 功能卡片 */
.feature-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.feature-card {
    background: white;
    border-radius: 16px;
    padding: 32px;
    transition: var(--transition);
    border: 1px solid #eee;
    position: relative;
}

.feature-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-hover);
}

.feature-tag {
    position: absolute;
    top: 16px;
    right: 16px;
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 600;
}

.feature-tag.paid {
    background: var(--primary-green);
    color: white;
}

.feature-tag.free {
    background: #e0e0e0;
    color: #666;
}

.feature-icon {
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, var(--primary-purple), var(--primary-green));
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    margin-bottom: 20px;
}

.feature-title {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-dark);
}

.feature-desc {
    font-size: 15px;
    color: #666;
    line-height: 1.6;
    margin-bottom: 16px;
}

.feature-link {
    color: var(--primary-purple);
    text-decoration: none;
    font-weight: 600;
    font-size: 14px;
    display: inline-flex;
    align-items: center;
    gap: 4px;
    transition: var(--transition);
}

.feature-link:hover {
    gap: 8px;
}

/* 平台支持 */
.platform-grid {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 24px;
    margin-bottom: 40px;
}

.platform-item {
    text-align: center;
    padding: 24px 16px;
    background: white;
    border-radius: 16px;
    transition: var(--transition);
    border: 1px solid #eee;
}

.platform-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow);
    border-color: var(--primary-purple);
}

.platform-icon {
    width: 48px;
    height: 48px;
    margin: 0 auto 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 32px;
}

.platform-name {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 12px;
}

.platform-btn {
    display: inline-block;
    padding: 8px 16px;
    background: var(--primary-purple);
    color: white;
    border-radius: 6px;
    font-size: 13px;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
}

.platform-btn:hover {
    background: #5a3ae0;
}

/* 定价卡片 */
.pricing-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    margin-bottom: 40px;
}

.toggle-btn {
    padding: 10px 24px;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    background: transparent;
    color: #666;
}

.toggle-btn.active {
    background: var(--primary-purple);
    color: white;
}

.pricing-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    align-items: stretch;
}

.pricing-card {
    background: white;
    border-radius: 20px;
    padding: 40px 32px;
    border: 2px solid #eee;
    transition: var(--transition);
    position: relative;
}

.pricing-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-hover);
}

.pricing-card.featured {
    border-color: var(--primary-purple);
    transform: scale(1.02);
}

.pricing-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--primary-purple);
    color: white;
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
}

.pricing-name {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--text-dark);
}

.pricing-price {
    font-size: 48px;
    font-weight: 700;
    color: var(--primary-purple);
    margin-bottom: 8px;
}

.pricing-price span {
    font-size: 16px;
    color: #666;
    font-weight: 400;
}

.pricing-desc {
    font-size: 14px;
    color: #666;
    margin-bottom: 24px;
}

.pricing-features {
    list-style: none;
    margin-bottom: 32px;
}

.pricing-features li {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 0;
    font-size: 15px;
    color: var(--text-dark);
    border-bottom: 1px solid #f0f0f0;
}

.pricing-features li:last-child {
    border-bottom: none;
}

.check-icon {
    color: var(--primary-green);
    font-size: 18px;
}

.cross-icon {
    color: #ccc;
    font-size: 18px;
}

/* FAQ */
.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background: white;
    border-radius: 12px;
    margin-bottom: 16px;
    border: 1px solid #eee;
    overflow: hidden;
    transition: var(--transition);
}

.faq-item:hover {
    border-color: var(--primary-purple);
}

.faq-question {
    padding: 24px;
    font-size: 17px;
    font-weight: 600;
    color: var(--text-dark);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--transition);
}

.faq-question:hover {
    color: var(--primary-purple);
}

.faq-toggle {
    font-size: 24px;
    transition: var(--transition);
}

.faq-item.active .faq-toggle {
    transform: rotate(45deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease;
}

.faq-item.active .faq-answer {
    max-height: 1000px;
}

.faq-content {
    padding: 0 24px 24px;
    color: #666;
    line-height: 1.8;
}

.faq-steps {
    list-style: none;
    counter-reset: step;
}

.faq-steps li {
    counter-increment: step;
    padding: 12px 0;
    padding-left: 40px;
    position: relative;
    border-bottom: 1px solid #f0f0f0;
}

.faq-steps li:last-child {
    border-bottom: none;
}

.faq-steps li::before {
    content: counter(step);
    position: absolute;
    left: 0;
    top: 12px;
    width: 28px;
    height: 28px;
    background: var(--primary-purple);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 13px;
    font-weight: 600;
}

/* 页脚 */
.footer {
    background: #1a1a2e;
    color: white;
    padding: 80px 24px 40px;
}

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

.footer-grid {
    display: grid;
    grid-template-columns: 2fr repeat(4, 1fr);
    gap: 40px;
    margin-bottom: 60px;
}

.footer-brand {
    max-width: 280px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 24px;
    font-weight: 700;
    color: white;
    margin-bottom: 16px;
    text-decoration: none;
}

.footer-desc {
    color: rgba(255, 255, 255, 0.6);
    font-size: 14px;
    line-height: 1.6;
    margin-bottom: 20px;
}

.footer-social {
    display: flex;
    gap: 12px;
}

.social-link {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    text-decoration: none;
    transition: var(--transition);
}

.social-link:hover {
    background: var(--primary-purple);
    transform: translateY(-2px);
}

.footer-column h4 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 20px;
    color: white;
}

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

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

.footer-links a {
    color: rgba(255, 255, 255, 0.6);
    text-decoration: none;
    font-size: 14px;
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--primary-green);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
}

.footer-copyright {
    color: rgba(255, 255, 255, 0.6);
    font-size: 14px;
}

.footer-legal {
    display: flex;
    gap: 24px;
}

.footer-legal a {
    color: rgba(255, 255, 255, 0.6);
    text-decoration: none;
    font-size: 14px;
    transition: var(--transition);
}

.footer-legal a:hover {
    color: var(--primary-green);
}

/* 友情链接 */
.friend-links {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 12px;
    padding: 20px;
    margin-top: 30px;
}

.friend-links-title {
    color: rgba(255, 255, 255, 0.8);
    font-size: 14px;
    margin-bottom: 12px;
}

#my-friend-links {
    color: rgba(255, 255, 255, 0.6);
    font-size: 13px;
    line-height: 1.8;
}

#my-friend-links a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    margin-right: 16px;
    transition: var(--transition);
}

#my-friend-links a:hover {
    color: var(--primary-green);
}

/* 响应式 */
@media (max-width: 1200px) {
    .hero-container {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .hero-visual {
        max-width: 500px;
        margin: 0 auto;
    }
    
    .value-cards {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .feature-cards {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .platform-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .footer-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }
    
    .mobile-toggle {
        display: flex;
    }
    
    .hero {
        padding: 100px 24px 60px;
    }
    
    .hero-title {
        font-size: 36px;
    }
    
    .hero-subtitle {
        font-size: 16px;
    }
    
    .section {
        padding: 60px 24px;
    }
    
    .section-title {
        font-size: 28px;
    }
    
    .value-cards,
    .feature-cards,
    .pricing-cards {
        grid-template-columns: 1fr;
    }
    
    .platform-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
}

/* 动画 */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* 返回顶部 */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 48px;
    height: 48px;
    background: var(--primary-purple);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 999;
    border: none;
    font-size: 20px;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background: #5a3ae0;
    transform: translateY(-4px);
}