/* Hero Section */
#hero-section-aptech {
    height: 100vh;
    position: relative;
    overflow: hidden;
    font-family: 'Pretendard', sans-serif;
}

/* Background Slides */
#background-slides-aptech {
    position: absolute;
    inset: 0;
    z-index: 1;
}

.bg-slide-aptech {
    position: absolute;
    inset: 0;
    background-size: 120%;
    transition: background-size 6s ease-out, background-position 6s ease-out, opacity 1.5s ease-in-out;
    opacity: 0;
    filter: grayscale(50%) contrast(1.1) brightness(0.85) sepia(25%) hue-rotate(15deg) saturate(1.1);
}

.bg-slide-aptech.active {
    opacity: 1;
}

/* Overlay */
#hero-section-aptech > div:nth-child(2) {
    position: absolute;
    inset: 0;
    background: rgba(0,0,0,.1);
    z-index: 2;
}

/* Main Content */
#main-content-aptech {
    position: absolute;
    top: 45%;
    left: 8%;
    right: 5%;
    transform: translateY(-50%);
    color: #fff;
    text-align: left;
    max-width: 85%;
    z-index: 4;
    padding-top: 20px;
}

/* Title Words */
#advanced-word-aptech,
#polytech-word-aptech {
    font-size: 60px;
    line-height: 1;
    margin-bottom: 15px;
    letter-spacing: -2px;
    transform: scaleY(0.88);
    opacity: 0;
    color: #ffffff;
    font-weight: 900;
    text-shadow: 0 2px 4px rgba(178,190,195,0.3);
}

#advanced-word-aptech {
    animation: fadeInSoft-aptech 900ms ease 100ms both;
}

#polytech-word-aptech {
    animation: fadeInSoft-aptech 900ms ease 300ms both;
    margin-bottom: 20px;
}

#aptech-word-aptech {
    font-size: 72px;
    line-height: 1;
    margin-bottom: 15px;
    letter-spacing: -2px;
    transform: scaleY(0.88);
    opacity: 0;
    animation: fadeInSoft-aptech 900ms ease 500ms both;
    color: #f58f27;
    font-weight: 900;
    text-shadow: 0 2px 4px rgba(245,143,39,0.3);
}

#hero-subtitle-aptech {
    font-size: 18px;
    font-weight: 400;
    line-height: 1.6;
    margin: 0;
    color: #ffffff;
    letter-spacing: 1px;
}

/* Navigation Bars */
#navigation-bars-aptech {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 8px;
    z-index: 10;
}

.nav-bar-aptech {
    width: 40px;
    height: 3px;
    background: #fff;
    cursor: pointer;
    transition: all .4s ease;
    border-radius: 2px;
    opacity: .4;
    position: relative;
    overflow: hidden;
}

.nav-bar-aptech.active {
    opacity: 1;
    transform: scale(1.1);
    background: rgba(255,255,255,0.8);
}

.nav-bar-aptech:hover {
    background: rgba(255,255,255,1) !important;
    box-shadow: 0 2px 8px rgba(255,255,255,0.4) !important;
}

.progress-fill-aptech {
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    background: #f58f27;
    width: 0%;
    transition: width .1s linear;
}

/* Progress Indicator */
#progress-indicator-aptech {
    position: absolute;
    bottom: 20px;
    right: 40px;
    color: #fff;
    font-family: 'Montserrat', monospace;
    font-size: 12px;
    font-weight: 400;
    z-index: 10;
    opacity: .8;
    letter-spacing: 1px;
}

/* Mobile Responsive */
@media (max-width: 768px) {
    #hero-section-aptech {
        height: 65vh !important;
    }
    
    #main-content-aptech {
        left: 5% !important;
        right: 5% !important;
        max-width: 90% !important;
        text-align: left !important;
        top: 48% !important;
    }
    
    .bg-slide-aptech {
        background-size: 250% !important;
    }
    
    #advanced-word-aptech,
    #polytech-word-aptech {
        font-size: 32px !important;
        margin-bottom: 12px !important;
        white-space: nowrap !important;
    }
    
    #aptech-word-aptech {
        font-size: 42px !important;
        margin-bottom: 8px !important;
        white-space: nowrap !important;
    }
    
    #hero-subtitle-aptech {
        font-size: 16px !important;
        letter-spacing: .5px !important;
        line-height: 1.5 !important;
    }
    
    #navigation-bars-aptech {
        bottom: 30px !important;
        left: 50% !important;
        transform: translateX(-50%) !important;
        gap: 6px !important;
    }
    
    .nav-bar-aptech {
        width: 30px !important;
        height: 2.5px !important;
    }
    
    #progress-indicator-aptech {
        right: 20px !important;
        bottom: 15px !important;
        font-size: 10px !important;
    }
}

@media (max-width: 480px) {
    #advanced-word-aptech,
    #polytech-word-aptech {
        font-size: 30px !important;
    }
    
    #aptech-word-aptech {
        font-size: 40px !important;
    }
    
    #hero-subtitle-aptech {
        font-size: 15px !important;
    }
}

@media (min-width: 1400px) {
    #advanced-word-aptech,
    #polytech-word-aptech {
        font-size: 70px !important;
    }
    
    #aptech-word-aptech {
        font-size: 84px !important;
    }
    
    #hero-subtitle-aptech {
        font-size: 20px !important;
    }
}

.title-word-aptech:hover {
    transform: scale(1.02);
    transition: transform .3s ease;
}