/* ==========================================
   谷谷AI智影 - 分层合作伙伴展示样式
   ========================================== */

.partners-section-tier {
    padding: 80px 0;
    background: var(--dark-bg);
    position: relative;
    overflow: hidden;
}

.partners-section-tier::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 25% 25%, rgba(168, 85, 247, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 75% 75%, rgba(236, 72, 153, 0.08) 0%, transparent 50%);
    pointer-events: none;
}

.partners-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
    position: relative;
    z-index: 1;
}

.partners-header {
    text-align: center;
    margin-bottom: 4rem;
}

.partners-title {
    font-family: 'Poppins', sans-serif;
    font-size: clamp(2.5rem, 5vw, 4rem);
    color: var(--text-primary);
    margin-bottom: 1rem;
    background: var(--gradient-cyber);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    display: inline-block;
    text-shadow: var(--glow-purple);
}

.partners-subtitle {
    font-size: 1.2rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.6;
}

/* 分层容器 */
.partners-tiers {
    display: flex;
    flex-direction: column;
    gap: 3rem;
}

/* 单个层级 */
.partner-tier {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 25px;
    padding: 2.5rem;
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    box-shadow: var(--shadow-lg);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.partner-tier::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(168, 85, 247, 0.1), transparent);
    transition: left 0.8s ease;
}

.partner-tier:hover::before {
    left: 100%;
}

.partner-tier:hover {
    transform: translateY(-5px);
    box-shadow: 
        0 20px 40px rgba(168, 85, 247, 0.2),
        0 10px 25px rgba(0, 0, 0, 0.1);
    border-color: var(--neon-purple);
}

/* 层级标题 */
.tier-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid var(--glass-border);
    position: relative;
    z-index: 2;
}

.tier-title {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.tier-icon {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: white;
    text-shadow: var(--glow-purple);
}

.tier-strategic .tier-icon {
    background: linear-gradient(135deg, #FFD700, #FFA500);
    box-shadow: 0 8px 25px rgba(255, 215, 0, 0.4);
}

.tier-core .tier-icon {
    background: linear-gradient(135deg, #C0C0C0, #A8A8A8);
    box-shadow: 0 8px 25px rgba(192, 192, 192, 0.4);
}

.tier-cooperative .tier-icon {
    background: linear-gradient(135deg, #CD7F32, #B8860B);
    box-shadow: 0 8px 25px rgba(205, 127, 50, 0.4);
}

.tier-name {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0;
}

.tier-description {
    font-size: 1rem;
    color: var(--text-secondary);
    margin: 0.5rem 0 0 0;
    opacity: 0.9;
}

.tier-count {
    background: var(--dark-bg-secondary);
    color: var(--neon-purple);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 600;
    border: 1px solid var(--glass-border);
}

/* Logo网格 */
.tier-logos {
    display: grid;
    gap: 1.5rem;
    align-items: center;
    justify-items: center;
    position: relative;
    z-index: 2;
}

/* 战略合作伙伴 - 大尺寸，3列 */
.tier-strategic .tier-logos {
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
}

.tier-strategic .partner-logo-tier {
    width: 160px;
    height: 120px;
    padding: 1.5rem;
}

/* 核心合作伙伴 - 中等尺寸，4列 */
.tier-core .tier-logos {
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
}

.tier-core .partner-logo-tier {
    width: 120px;
    height: 90px;
    padding: 1.2rem;
}

/* 合作伙伴 - 小尺寸，5列 */
.tier-cooperative .tier-logos {
    grid-template-columns: repeat(auto-fit, minmax(110px, 1fr));
}

.tier-cooperative .partner-logo-tier {
    width: 100px;
    height: 75px;
    padding: 1rem;
}

/* Logo样式 */
.partner-logo-tier {
    background: rgba(255, 255, 255, 0.98);
    border-radius: 15px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    border: 2px solid transparent;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.partner-logo-tier::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(168, 85, 247, 0.15), transparent);
    transition: left 0.5s ease;
}

.partner-logo-tier:hover::before {
    left: 100%;
}

.partner-logo-tier:hover {
    transform: translateY(-8px) scale(1.05);
    border-color: var(--neon-purple);
    box-shadow: 
        0 15px 30px rgba(168, 85, 247, 0.3),
        0 8px 20px rgba(0, 0, 0, 0.15);
    background: rgba(255, 255, 255, 1);
}

.partner-logo-tier img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    filter: none;
    transition: all 0.3s ease;
    position: relative;
    z-index: 1;
}

.partner-logo-tier:hover img {
    transform: scale(1.1);
}

/* 响应式设计 */
@media (max-width: 1200px) {
    .tier-strategic .tier-logos {
        grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    }
    
    .tier-core .tier-logos {
        grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    }
    
    .tier-cooperative .tier-logos {
        grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
    }
}

@media (max-width: 768px) {
    .partners-section-tier {
        padding: 60px 0;
    }
    
    .partners-container {
        padding: 0 1rem;
    }
    
    .partners-tiers {
        gap: 2rem;
    }
    
    .partner-tier {
        padding: 2rem;
        border-radius: 20px;
    }
    
    .tier-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }
    
    .tier-name {
        font-size: 1.5rem;
    }
    
    .tier-strategic .tier-logos {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .tier-core .tier-logos {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .tier-cooperative .tier-logos {
        grid-template-columns: repeat(4, 1fr);
    }
    
    .tier-strategic .partner-logo-tier {
        width: 140px;
        height: 100px;
    }
    
    .tier-core .partner-logo-tier {
        width: 100px;
        height: 75px;
    }
    
    .tier-cooperative .partner-logo-tier {
        width: 80px;
        height: 60px;
    }
}

@media (max-width: 480px) {
    .tier-strategic .tier-logos,
    .tier-core .tier-logos {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .tier-cooperative .tier-logos {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .tier-strategic .partner-logo-tier {
        width: 120px;
        height: 90px;
    }
    
    .tier-core .partner-logo-tier {
        width: 90px;
        height: 65px;
    }
    
    .tier-cooperative .partner-logo-tier {
        width: 70px;
        height: 50px;
    }
}

/* 高对比度模式支持 */
@media (prefers-contrast: high) {
    .partner-tier {
        border: 3px solid #fff;
        background: #000;
    }
    
    .partner-logo-tier {
        border: 2px solid #fff;
        background: #fff;
    }
}

/* 减少动画偏好支持 */
@media (prefers-reduced-motion: reduce) {
    .partner-tier,
    .partner-logo-tier,
    .partner-tier::before,
    .partner-logo-tier::before {
        transition: none;
        animation: none;
    }
    
    .partner-tier:hover,
    .partner-logo-tier:hover {
        transform: none;
    }
    
    .partner-logo-tier:hover img {
        transform: none;
    }
}