/* 首屏英雄区 - 蓝色科技背景，清晰版 */
.hero {
    margin-top: 72px;
    height: 88vh;
    position: relative;
    overflow: hidden;
    display: flex;
    justify-content: center;
    align-items: center;
    color: #ffffff;
    font-family: "PingFang SC", "Microsoft YaHei", "HarmonyOS Sans SC", "Inter", system-ui, sans-serif;
}

/* 背景动图：不透明，保留原色 */
.hero-bg-media {
    position: absolute;
    inset: 0;
    z-index: 0;
}

.hero-gif-bg {
    width: 100%;
    height: 80vh;
    object-fit: cover;
    opacity: 1;
    image-rendering: -webkit-optimize-contrast;
    image-rendering: crisp-edges;
    image-rendering: pixelated;
    transform: translateZ(0);
    backface-visibility: hidden;
}
/* 左上角相关样式保留，但HTML已经删掉元素，不会渲染 */
.hero-top-left {
    position: absolute;
    left: 40px;
    top: 40px;
    display: flex;
    align-items: center;
    gap: 14px;
    z-index: 3;
}

.hero-logo {
    width: 48px;
    height: 48px;
    object-fit: contain;
}

.hero-title-text {
    display: flex;
    flex-direction: column;
    line-height: 1.3;
}

.hero-school-name {
    font-size: 16px;
    color: #ffffff;
    letter-spacing: 1px;
    font-weight: 700;
    white-space: nowrap;
}
.hero-assoc-name {
    font-size: 16px;
    color: #165DFF;
    letter-spacing: 1px;
    font-weight: 700;
}

/* 中间标题 */
.hero-content {
    position: relative;
    z-index: 3;
    text-align: center;
}

.hero-main-title {
    font-size: 56px;
    font-weight: 800;
    color: #ffffff;
    letter-spacing: 6px;
    text-shadow:
        0 2px 8px rgba(0, 0, 0, 0.8),
        0 0 30px rgba(56, 189, 248, 0.9);
    opacity: 0;
    animation: textPop 1.2s ease-out forwards;
    animation-delay: 0.3s;
}

.hero-subtitle {
    margin-top: 16px;
    font-size: 20px;
    color: #e0f2fe;
    letter-spacing: 3px;
    font-weight: 500;
    opacity: 0;
    animation: textPop 1.2s ease-out forwards;
    animation-delay: 0.6s;
}

/* 移动端适配 */
@media (max-width: 992px) {
    .hero-top-left {
        left: 24px;
        top: 30px;
    }

    .hero-logo {
        width: 42px;
        height: 42px;
    }

    .hero-school-name {
        font-size: 14px;
    }
    .hero-assoc-name {
        font-size: 14px;
    }

    .hero-main-title {
        font-size: 42px;
        letter-spacing: 4px;
    }

    .hero-subtitle {
        font-size: 16px;
        letter-spacing: 2px;
    }
}

@media (max-width: 600px) {
    .hero-top-left {
        left: 16px;
        top: 24px;
    }

    .hero-logo {
        width: 36px;
        height: 36px;
    }

    .hero-school-name {
        font-size: 12px;
    }
    .hero-assoc-name {
        font-size: 12px;
    }

    .hero-main-title {
        font-size: 32px;
        letter-spacing: 2px;
        padding: 0 24px;
    }

    .hero-subtitle {
        font-size: 14px;
        letter-spacing: 1px;
    }
}

/* 文字弹出动画 */
@keyframes textPop {
    from {
        opacity: 0;
        transform: translateY(12px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}