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

:root {
    --bg-dark: #0a0a0a;
    --bg-gradient: linear-gradient(135deg, #0a0a0a 0%, #1a1a1a 50%, #0f0f0f 100%);
    --accent-warm: #e85d04;
    --accent-gold: #f48c06;
    --text-primary: #f5f5f5;
    --text-secondary: #a0a0a0;
    --text-muted: #606060;
}

html, body {
    height: 100%;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    background: var(--bg-gradient);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    position: relative;
    overflow-x: hidden;
}

.noise-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1000;
    opacity: 0.03;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
}

.header {
    padding: 60px 40px 40px;
    position: relative;
    z-index: 10;
}

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

.company-name {
    font-size: clamp(48px, 10vw, 96px);
    font-weight: 800;
    letter-spacing: -0.03em;
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--accent-gold) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.1;
    margin-bottom: 16px;
    transform: translateX(-5px);
}

.slogan {
    font-size: clamp(16px, 3vw, 24px);
    color: var(--text-secondary);
    font-weight: 300;
    letter-spacing: 0.1em;
    transform: translateX(3px);
}

.main-content {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px;
    position: relative;
    z-index: 10;
}

.upgrade-notice {
    text-align: center;
    max-width: 600px;
    position: relative;
}

.notice-line {
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--accent-warm), var(--accent-gold));
    margin: 0 auto 32px;
    border-radius: 2px;
    animation: linePulse 2s cubic-bezier(0.4, 0, 0.2, 1) infinite;
}

@keyframes linePulse {
    0%, 100% {
        transform: scaleX(1);
        opacity: 1;
    }
    50% {
        transform: scaleX(1.5);
        opacity: 0.7;
    }
}

.notice-title {
    font-size: clamp(32px, 6vw, 56px);
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

.notice-desc {
    font-size: clamp(14px, 2vw, 18px);
    color: var(--text-secondary);
    margin-bottom: 40px;
    font-weight: 400;
}

.loading-bar {
    width: 100%;
    max-width: 300px;
    height: 2px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 1px;
    margin: 0 auto;
    overflow: hidden;
    position: relative;
}

.loading-progress {
    height: 100%;
    width: 30%;
    background: linear-gradient(90deg, var(--accent-warm), var(--accent-gold));
    border-radius: 1px;
    animation: loadingMove 1.8s cubic-bezier(0.65, 0, 0.35, 1) infinite;
}

@keyframes loadingMove {
    0% {
        transform: translateX(-100%);
    }
    100% {
        transform: translateX(400%);
    }
}

.footer {
    padding: 32px 40px;
    text-align: center;
    position: relative;
    z-index: 10;
}

.icp-link {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 13px;
    letter-spacing: 0.05em;
    transition: color 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
}

.icp-link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--accent-warm);
    transition: width 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.icp-link:hover {
    color: var(--text-secondary);
}

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

@media (max-width: 768px) {
    .header {
        padding: 40px 24px 32px;
    }
    
    .company-name {
        transform: translateX(-3px);
    }
    
    .slogan {
        transform: translateX(2px);
    }
    
    .main-content {
        padding: 24px;
    }
    
    .footer {
        padding: 24px;
    }
}

@media (max-width: 480px) {
    .header {
        padding: 32px 20px 24px;
    }
    
    .main-content {
        padding: 20px;
    }
    
    .notice-line {
        width: 40px;
        margin-bottom: 24px;
    }
    
    .notice-desc {
        margin-bottom: 32px;
    }
    
    .footer {
        padding: 20px;
    }
    
    .icp-link {
        font-size: 12px;
    }
}