.portfolio-main {
    font-family: sans-serif;
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

.portfolio-banner {
    background-color: #1a1f2e;
    color: white;
    padding: 60px 20px;
    text-align: center;
    margin-bottom: 40px;
}

.portfolio-banner-content {
    max-width: 1200px;
    margin: 0 auto;
}

.portfolio-banner-title {
    font-size: 2.5rem;
    margin-bottom: 15px;
    color: rgb(249, 100, 0);

    opacity: 0;
    transform: translateY(50px);
    transition: all 0.8s ease-out;
}

.portfolio-banner-subtitle {
    font-size: 1.2rem;
    max-width: 700px;
    margin: 0 auto;
    opacity: 0.9;

    opacity: 0; 
    transform: translateY(50px);
    transition: all 0.8s ease-out;
}

.text-visible {
    opacity: 1 !important; 
    transform: translateY(0) !important; 
}

.portfolio-grid {
    display: flex;
    flex-direction: column;
    gap: 40px;
    max-width: 1200px;
    margin: 0 auto;
}

.portfolio-card {
    background-color: white;
    border-radius: 14px;
    overflow: hidden;
    box-shadow: 0 6px 15px rgba(0,0,0,0.1);
    width: 100%;
}

.portfolio-card-image {
    width: 100%;
    position: relative;
    height: auto; 
    overflow: visible; 
}

.portfolio-card-image img {
    width: 100%;
    height: auto; 
    display: block;
}

.portfolio-card-content {
    padding: 20px;
}

.portfolio-card-title {
    font-size: 1.8rem;
    color: rgb(249, 100, 0);
    margin-bottom: 10px;
}

.portfolio-card-text {
    font-size: 1.2rem;
    color: #333;
    line-height: 1.5;
}


/* -------------------- Phone -------------------- */
@media (min-width: 768px) {
    .portfolio-title {
        font-size: 36px;
    }
    
    .portfolio-intro {
        font-size: 18px;
        max-width: 800px;
    }
    
    .portfolio-grid {
        gap: 50px;
    }
    
    .portfolio-card-content {
        padding: 35px 40px;
    }
    
    .portfolio-card-title {
        font-size: 1.7rem;
    }
    
    .portfolio-card-text {
        font-size: 1.1rem;
    }
}

/* -------------------- Tablet -------------------- */
@media (min-width: 1024px) {
    .portfolio-main {
        padding: 60px 40px;
    }
    
    .portfolio-hero {
        margin-bottom: 50px;
    }
    
    .portfolio-title {
        font-size: 40px;
    }
    
    .portfolio-intro {
        font-size: 20px;
        max-width: 900px;
    }
    
    .portfolio-grid {
        gap: 60px;
        max-width: 1400px;
    }
    
    .portfolio-card-content {
        padding: 40px 50px;
    }
    
    .portfolio-card-title {
        font-size: 2.0rem;
    }
    
    .portfolio-card-text {
        font-size: 1.3rem;
        line-height: 1.7;
    }
}

/* -------------------- Desktop -------------------- */
@media (min-width: 1440px) {
    .portfolio-main {
        padding: 80px 60px;
    }
    
    .portfolio-hero {
        margin-bottom: 60px;
    }
    
    .portfolio-title {
        font-size: 44px;
        margin-bottom: 15px;
    }
    
    .portfolio-intro {
        font-size: 22px;
        max-width: 1000px;
    }
    
    .portfolio-grid {
        gap: 70px;
        max-width: 1600px;
    }
    
    .portfolio-card {
        border-radius: 20px;
    }
    
    .portfolio-card-content {
        padding: 50px 60px;
    }
    
    .portfolio-card-title {
        font-size: 2.1rem;
        margin-bottom: 20px;
    }
    
    .portfolio-card-text {
        font-size: 1.3rem;
        line-height: 1.8;
    }
}

/* ⚠️ 注意：我把原来最下面的那两个 @media 删掉了！
   因为它们设置了 max-height: 600px 和 700px，
   如果不删掉，你在电脑上看图片还是会被切掉。 */