/* OKX下载指南网站样式 - 深色高级版 */
:root {
    --primary-color: #0a0e17;
    --secondary-color: #121826;
    --accent-color: #00d4ff;
    --accent-gradient: linear-gradient(90deg, #00d4ff, #0095ff);
    --success-color: #00ff9d;
    --warning-color: #ffb347;
    --danger-color: #ff6b9d;
    --text-primary: #ffffff;
    --text-secondary: #b0b7c3;
    --text-muted: #8a94a6;
    --card-bg: rgba(18, 24, 38, 0.8);
    --card-border: rgba(255, 255, 255, 0.05);
    --surface-dark: #0d1117;
    --surface-darker: #070a0f;
    --border-radius: 16px;
    --border-radius-lg: 24px;
    --box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
    --box-shadow-hover: 0 20px 60px rgba(0, 212, 255, 0.2);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
}

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

body {
    font-family: 'Inter', sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background: radial-gradient(ellipse at top, var(--surface-dark) 0%, var(--surface-darker) 100%);
    min-height: 100vh;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 头部样式 */
header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    padding: 3rem 0 2rem;
    text-align: center;
    border-bottom-left-radius: var(--border-radius-lg);
    border-bottom-right-radius: var(--border-radius-lg);
    box-shadow: 0 10px 50px rgba(0, 0, 0, 0.4);
    position: relative;
    overflow: hidden;
}

header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 100%;
    background: radial-gradient(circle at 30% 20%, rgba(0, 212, 255, 0.1) 0%, transparent 50%);
    pointer-events: none;
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
    margin-bottom: 15px;
    position: relative;
    z-index: 1;
}

.logo i {
    font-size: 3rem;
    color: var(--accent-color);
    filter: drop-shadow(0 0 15px rgba(0, 212, 255, 0.5));
}

.logo h1 {
    font-family: 'Poppins', sans-serif;
    font-weight: 800;
    font-size: 3rem;
    background: linear-gradient(90deg, #00d4ff, #0095ff, #0066ff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.5px;
}

.tagline {
    font-size: 1.2rem;
    opacity: 0.85;
    max-width: 700px;
    margin: 0 auto;
    margin-top: 10px;
    color: var(--text-secondary);
    position: relative;
    z-index: 1;
}

/* 主要内容区域 */
main {
    padding: 3rem 0;
}

section {
    margin-bottom: 4rem;
}

/* 英雄区域 */
.hero {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    padding: 3rem;
    box-shadow: var(--box-shadow);
    margin-bottom: 4rem;
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(10px);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 100%;
    background: radial-gradient(circle at 80% 20%, rgba(0, 212, 255, 0.05) 0%, transparent 50%);
    pointer-events: none;
}

.hero h2 {
    font-family: 'Poppins', sans-serif;
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
    position: relative;
    z-index: 1;
}

.hero p {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    max-width: 800px;
    line-height: 1.8;
    position: relative;
    z-index: 1;
}

.stats {
    display: flex;
    gap: 2rem;
    flex-wrap: wrap;
    margin-top: 2.5rem;
    position: relative;
    z-index: 1;
}

.stat {
    display: flex;
    align-items: center;
    gap: 12px;
    background: rgba(255, 255, 255, 0.05);
    padding: 12px 24px;
    border-radius: 50px;
    font-weight: 500;
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(5px);
}

.stat i {
    color: var(--accent-color);
    font-size: 1.2rem;
}

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

/* 下载区域 */
.download-section h2, .instructions h2 {
    font-family: 'Poppins', sans-serif;
    font-size: 2rem;
    margin-bottom: 2rem;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 12px;
}

.download-section h2 i, .instructions h2 i {
    color: var(--accent-color);
}

.platforms {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2.5rem;
    margin-top: 2rem;
}

.platform-card {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    padding: 2.5rem 2rem;
    box-shadow: var(--box-shadow);
    transition: var(--transition);
    text-align: center;
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(10px);
    position: relative;
    overflow: hidden;
}

.platform-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--accent-gradient);
}

.platform-card:hover {
    transform: translateY(-12px);
    box-shadow: var(--box-shadow-hover);
    border-color: rgba(0, 212, 255, 0.3);
}

.platform-icon {
    font-size: 4rem;
    margin-bottom: 1.5rem;
}

.platform-icon .fa-windows {
    color: #0078d7;
}

.platform-icon .fa-apple {
    color: #ffffff;
}

.platform-icon .fa-android {
    color: #3ddc84;
}

.platform-card h3 {
    font-size: 1.6rem;
    margin-bottom: 0.8rem;
    color: var(--text-primary);
}

.platform-card p {
    color: var(--text-secondary);
    margin-bottom: 1.8rem;
    min-height: 60px;
    line-height: 1.6;
}

.download-btn {
    display: inline-block;
    background: var(--accent-gradient);
    color: white;
    padding: 14px 28px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    margin-bottom: 1.2rem;
    width: 100%;
    text-align: center;
    border: none;
    font-size: 1rem;
    letter-spacing: 0.5px;
    position: relative;
    overflow: hidden;
}

.download-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;
}

.download-btn:hover {
    background: linear-gradient(90deg, #0095ff, #0066ff);
    transform: scale(1.05);
    color: white;
    box-shadow: 0 10px 25px rgba(0, 212, 255, 0.3);
}

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

.file-info {
    font-size: 0.9rem;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin-top: 1.2rem;
}

.file-info i {
    color: var(--accent-color);
}

/* 邀请区域 */
.invite-section {
    margin-top: 4rem;
}

.invite-card {
    background: linear-gradient(135deg, rgba(10, 14, 23, 0.9) 0%, rgba(18, 24, 38, 0.9) 100%);
    border-radius: var(--border-radius);
    padding: 3rem;
    color: white;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(20px);
    position: relative;
    overflow: hidden;
}

.invite-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 100%;
    background: radial-gradient(circle at 20% 50%, rgba(0, 212, 255, 0.1) 0%, transparent 70%);
    pointer-events: none;
}

.invite-header {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 1.5rem;
    position: relative;
    z-index: 1;
}

.invite-header i {
    font-size: 2.5rem;
    color: var(--accent-color);
    filter: drop-shadow(0 0 10px rgba(0, 212, 255, 0.5));
}

.invite-header h2 {
    font-family: 'Poppins', sans-serif;
    font-size: 2rem;
    background: linear-gradient(90deg, #00d4ff, #ffffff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.invite-card > p {
    opacity: 0.9;
    margin-bottom: 2.5rem;
    font-size: 1.2rem;
    color: var(--text-secondary);
    position: relative;
    z-index: 1;
}

.invite-code-container {
    background: var(--glass-bg);
    border-radius: var(--border-radius);
    padding: 2rem;
    margin-bottom: 2.5rem;
    backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    position: relative;
    z-index: 1;
}

.register-btn {
    display: block;
    background: linear-gradient(90deg, #00ff9d, #00d4ff);
    color: #0a0e17;
    padding: 16px 32px;
    border-radius: 12px;
    text-decoration: none;
    font-weight: 700;
    transition: var(--transition);
    margin-bottom: 1.5rem;
    width: 100%;
    text-align: center;
    font-size: 1.1rem;
    letter-spacing: 0.5px;
    border: none;
    box-shadow: 0 10px 30px rgba(0, 255, 157, 0.3);
    position: relative;
    overflow: hidden;
}

.register-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
    transition: left 0.7s;
}

.register-btn:hover {
    background: linear-gradient(90deg, #00d4ff, #00ff9d);
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(0, 255, 157, 0.4);
    color: #0a0e17;
}

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

.register-btn i {
    margin-right: 10px;
    font-size: 1.2rem;
}

.invite-code {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: rgba(0, 0, 0, 0.3);
    border-radius: 12px;
    padding: 20px 25px;
    margin-bottom: 1.5rem;
    border: 1px solid rgba(0, 212, 255, 0.2);
}

#inviteCode {
    font-family: 'Courier New', monospace;
    font-size: 2rem;
    font-weight: 800;
    color: var(--accent-color);
    letter-spacing: 3px;
    text-shadow: 0 0 10px rgba(0, 212, 255, 0.3);
}

.copy-btn {
    background: var(--accent-gradient);
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 10px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1rem;
    letter-spacing: 0.5px;
}

.copy-btn:hover {
    background: linear-gradient(90deg, #0095ff, #0066ff);
    transform: scale(1.05);
    box-shadow: 0 10px 20px rgba(0, 212, 255, 0.3);
}

.invite-note {
    text-align: center;
    font-style: italic;
    opacity: 0.8;
    color: var(--text-secondary);
    font-size: 0.95rem;
    position: relative;
    z-index: 1;
}

.invite-benefits {
    background: rgba(255, 255, 255, 0.03);
    border-radius: var(--border-radius);
    padding: 2rem;
    border: 1px solid var(--glass-border);
    position: relative;
    z-index: 1;
}

.invite-benefits h3 {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 1.5rem;
    font-size: 1.4rem;
    color: var(--text-primary);
}

.invite-benefits h3 i {
    color: var(--success-color);
    filter: drop-shadow(0 0 8px rgba(0, 255, 157, 0.3));
}

.invite-benefits ul {
    list-style: none;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 12px;
}

.invite-benefits li {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
    color: var(--text-secondary);
}

.invite-benefits i {
    color: var(--success-color);
    font-size: 1.1rem;
}

/* 使用指南 */
.steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2.5rem;
    margin-top: 2rem;
}

.step {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    padding: 2.5rem 2rem;
    box-shadow: var(--box-shadow);
    text-align: center;
    position: relative;
    transition: var(--transition);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(10px);
    min-height: 280px;
}

.step:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
    border-color: rgba(0, 212, 255, 0.3);
}

.step-number {
    position: absolute;
    top: -25px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--accent-gradient);
    color: white;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 1.4rem;
    box-shadow: 0 10px 20px rgba(0, 212, 255, 0.3);
    border: 3px solid var(--surface-dark);
}

.step h3 {
    margin-top: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
    font-size: 1.4rem;
}

.step p {
    color: var(--text-secondary);
    line-height: 1.7;
}

/* 警告区域 */
.warning-card {
    background: linear-gradient(135deg, rgba(255, 179, 71, 0.1) 0%, rgba(255, 107, 157, 0.05) 100%);
    border-radius: var(--border-radius);
    padding: 2.5rem;
    border-left: 5px solid var(--warning-color);
    border: 1px solid rgba(255, 179, 71, 0.2);
    backdrop-filter: blur(10px);
}

.warning-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 1.5rem;
}

.warning-header i {
    color: var(--warning-color);
    font-size: 1.8rem;
    filter: drop-shadow(0 0 8px rgba(255, 179, 71, 0.3));
}

.warning-header h3 {
    color: var(--warning-color);
    font-size: 1.5rem;
}

.warning-card ul {
    list-style: none;
}

.warning-card li {
    margin-bottom: 12px;
    padding-left: 1.8rem;
    position: relative;
    color: var(--text-secondary);
    line-height: 1.7;
}

.warning-card li:before {
    content: '⚠️';
    position: absolute;
    left: 0;
    top: 2px;
    font-size: 1rem;
}

.warning-card a {
    color: var(--accent-color);
    font-weight: 600;
    text-decoration: none;
    border-bottom: 1px solid rgba(0, 212, 255, 0.3);
}

.warning-card a:hover {
    color: #00b8ff;
    border-bottom-color: #00b8ff;
}

.warning-card strong {
    color: var(--warning-color);
}

/* 页脚 */
footer {
    background: linear-gradient(180deg, var(--primary-color) 0%, #05080f 100%);
    color: white;
    padding: 4rem 0 2rem;
    margin-top: 5rem;
    border-top-left-radius: var(--border-radius-lg);
    border-top-right-radius: var(--border-radius-lg);
    border-top: 1px solid var(--glass-border);
    position: relative;
}

footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--accent-color), transparent);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-section h4 {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 1.5rem;
    color: var(--accent-color);
    font-size: 1.2rem;
}

.footer-section p {
    opacity: 0.7;
    line-height: 1.7;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    padding-top: 2rem;
    text-align: center;
    opacity: 0.6;
    font-size: 0.9rem;
    color: var(--text-muted);
}

.domain-notice {
    color: var(--danger-color);
    font-weight: 600;
    margin-top: 0.8rem;
    font-size: 0.9rem;
    background: rgba(255, 107, 157, 0.1);
    padding: 8px 16px;
    border-radius: 20px;
    display: inline-block;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .logo h1 {
        font-size: 2.2rem;
    }
    
    .logo i {
        font-size: 2.2rem;
    }
    
    .hero h2 {
        font-size: 2rem;
    }
    
    .hero p {
        font-size: 1.1rem;
    }
    
    .platforms, .steps {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .stats {
        flex-direction: column;
        gap: 1rem;
    }
    
    .invite-benefits ul {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .invite-code {
        flex-direction: column;
        gap: 15px;
        text-align: center;
    }
    
    #inviteCode {
        font-size: 1.5rem;
    }
    
    .invite-header h2 {
        font-size: 1.6rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }
    
    .hero, .platform-card, .invite-card, .step, .warning-card {
        padding: 1.8rem;
    }
    
    .download-btn {
        padding: 12px 24px;
        font-size: 0.95rem;
    }
    
    .logo h1 {
        font-size: 1.8rem;
    }
    
    .tagline {
        font-size: 1rem;
    }
}

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

@keyframes glow {
    0%, 100% { box-shadow: 0 10px 40px rgba(0, 212, 255, 0.1); }
    50% { box-shadow: 0 15px 50px rgba(0, 212, 255, 0.2); }
}

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

.platform-card, .step, .invite-card, .warning-card {
    animation: fadeIn 0.8s cubic-bezier(0.22, 0.61, 0.36, 1) forwards;
}

.platform-card:hover {
    animation: float 3s ease-in-out infinite;
}

.invite-card {
    animation: glow 4s ease-in-out infinite;
}

.platform-card:nth-child(2) { animation-delay: 0.1s; }
.platform-card:nth-child(3) { animation-delay: 0.2s; }
.step:nth-child(2) { animation-delay: 0.1s; }
.step:nth-child(3) { animation-delay: 0.2s; }
.step:nth-child(4) { animation-delay: 0.3s; }

/* 滚动动画 */
.fade-in-section {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

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