/* ==================== 全局样式 ==================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
    background: #ffffff;
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
    color: #1a1a1a;
    line-height: 1.6;
}

/* ==================== 背景 - 极简留白 ==================== */
/* 移除所有复杂背景效果，保持干净简洁 */

/* ==================== 主容器 ==================== */
.main-container {
    position: relative;
    z-index: 1;
    max-width: 1000px;
    margin: 0 auto;
    padding: 80px 24px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

/* ==================== Logo 区域 ==================== */
.logo-section {
    margin-bottom: 40px;
    animation: fadeIn 1s ease-out;
}

.orange-logo {
    position: relative;
    width: 120px;
    height: 120px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.orange-core {
    position: relative;
    width: 60px;
    height: 60px;
    z-index: 2;
}

.segment {
    position: absolute;
    width: 20px;
    height: 20px;
    background: #ff6b35;
    border-radius: 50%;
    top: 50%;
    left: 50%;
    transform-origin: 0 0;
    animation: pulse 2s ease-in-out infinite;
}

.segment-1 { transform: translate(-50%, -50%) rotate(0deg) translateX(25px); }
.segment-2 { transform: translate(-50%, -50%) rotate(60deg) translateX(25px); }
.segment-3 { transform: translate(-50%, -50%) rotate(120deg) translateX(25px); }
.segment-4 { transform: translate(-50%, -50%) rotate(180deg) translateX(25px); }
.segment-5 { transform: translate(-50%, -50%) rotate(240deg) translateX(25px); }
.segment-6 { transform: translate(-50%, -50%) rotate(300deg) translateX(25px); }

@keyframes pulse {
    0%, 100% {
        opacity: 1;
        transform: translate(-50%, -50%) rotate(var(--rotation)) translateX(25px) scale(1);
    }
    50% {
        opacity: 0.7;
        transform: translate(-50%, -50%) rotate(var(--rotation)) translateX(25px) scale(1.1);
    }
}

.knowledge-ring {
    position: absolute;
    border-radius: 50%;
    border: 1.5px solid #e0e0e0;
    animation: rotate 30s linear infinite;
}

.ring-1 {
    width: 90px;
    height: 90px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.ring-2 {
    width: 110px;
    height: 110px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation-direction: reverse;
    animation-duration: 35s;
}

.ring-3 {
    width: 130px;
    height: 130px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation-duration: 40s;
}

@keyframes rotate {
    from { transform: translate(-50%, -50%) rotate(0deg); }
    to { transform: translate(-50%, -50%) rotate(360deg); }
}

.ai-nodes {
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
}

.node {
    position: absolute;
    width: 6px;
    height: 6px;
    background: #ff6b35;
    border-radius: 50%;
    animation: nodeFade 3s ease-in-out infinite;
}

.node-1 { top: 10%; left: 50%; }
.node-2 { top: 50%; right: 10%; }
.node-3 { bottom: 10%; left: 50%; }
.node-4 { top: 50%; left: 10%; }

@keyframes nodeFade {
    0%, 100% { opacity: 0.3; }
    50% { opacity: 1; }
}

/* ==================== 标题区域 ==================== */
.main-title {
    font-size: 2.5rem;
    font-weight: 600;
    color: #1a1a1a;
    text-align: center;
    margin-bottom: 12px;
    letter-spacing: -0.5px;
    line-height: 1.2;
}

.subtitle {
    font-size: 1.125rem;
    color: #666666;
    text-align: center;
    margin-bottom: 48px;
    min-height: 24px;
    font-weight: 400;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

/* ==================== 建设中状态区域 ==================== */
.construction-section {
    margin-bottom: 60px;
    animation: fadeIn 1s ease-out 0.3s both;
    width: 100%;
    max-width: 400px;
    text-align: center;
}

.construction-icon {
    margin-bottom: 24px;
}

.construction-icon .icon {
    font-size: 4rem;
    display: block;
    animation: bounce 2s ease-in-out infinite;
}

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

.construction-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: #1a1a1a;
    margin-bottom: 12px;
}

.construction-description {
    font-size: 1rem;
    color: #666666;
    line-height: 1.6;
}

/* ==================== 特性卡片 ==================== */
.features-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 16px;
    width: 100%;
    max-width: 800px;
    margin-bottom: 60px;
    animation: fadeIn 1s ease-out 0.5s both;
}

.feature-card {
    background: #ffffff;
    border-radius: 12px;
    padding: 24px;
    text-align: center;
    border: 1px solid #e5e5e5;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.feature-card:hover {
    border-color: #ff6b35;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    transform: translateY(-2px);
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 12px;
    display: block;
}

.feature-card h3 {
    font-size: 1.125rem;
    color: #1a1a1a;
    margin-bottom: 8px;
    font-weight: 600;
}

.feature-card p {
    color: #666666;
    font-size: 0.875rem;
    line-height: 1.5;
}

/* ==================== 底部信息 ==================== */
.footer-info {
    text-align: center;
    animation: fadeIn 1s ease-out 0.7s both;
}

.contact-section {
    margin-bottom: 12px;
    font-size: 0.875rem;
}

.contact-label {
    color: #666666;
    margin-right: 6px;
}

.contact-email {
    color: #ff6b35;
    text-decoration: none;
    transition: all 0.2s ease;
    font-weight: 500;
}

.contact-email:hover {
    color: #e55a2b;
    text-decoration: underline;
}

.beian-section {
    margin-bottom: 10px;
}

.beian-link {
    color: #999999;
    text-decoration: none;
    font-size: 0.8rem;
    transition: all 0.2s ease;
}

.beian-link:hover {
    color: #666666;
    text-decoration: underline;
}

.copyright {
    color: #cccccc;
    font-size: 0.75rem;
}

/* ==================== 响应式设计 ==================== */
@media screen and (max-width: 768px) {
    .main-container {
        padding: 60px 20px;
    }

    .main-title {
        font-size: 1.875rem;
    }

    .subtitle {
        font-size: 1rem;
    }

    .features-grid {
        gap: 12px;
    }

    .feature-card {
        padding: 20px;
    }

    .feature-icon {
        font-size: 2rem;
    }

    .feature-card h3 {
        font-size: 1rem;
    }

    .feature-card p {
        font-size: 0.8125rem;
    }
}

/* ==================== PC 端优化 ==================== */
@media screen and (min-width: 769px) {
    .features-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 20px;
    }

    .feature-card {
        padding: 28px 24px;
    }

    .main-title {
        font-size: 2.75rem;
    }

    .subtitle {
        font-size: 1.25rem;
    }

    .orange-logo {
        width: 140px;
        height: 140px;
    }

    .orange-core {
        width: 70px;
        height: 70px;
    }

    .segment {
        width: 24px;
        height: 24px;
    }
}

/* ==================== 大屏优化 ==================== */
@media screen and (min-width: 1200px) {
    .main-container {
        padding: 100px 40px;
    }

    .main-title {
        font-size: 3rem;
    }

    .features-grid {
        max-width: 900px;
        gap: 24px;
    }

    .feature-card {
        padding: 32px 28px;
    }
}