/* Main Design System & UI Overrides */
html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Noto Sans JP', sans-serif;
    color: #333;
    line-height: 1.8;
    letter-spacing: 0.05em;
    overflow-x: hidden;
    background-color: #fff;
    /* Right-click prevention */
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

/* Section Spacing */
section {
    margin-bottom: 80px;
}

@media (min-width: 768px) {
    section {
        margin-bottom: 120px;
    }
}

/* Section Heading Design */
.section-heading {
    text-align: center;
    margin-bottom: 60px;
}

.section-heading-en {
    display: block;
    font-family: 'Playfair Display', serif;
    font-size: 1.5rem;
    font-weight: 700;
    font-style: italic;
    color: #00AFAD; /* tiffanyDark */
    letter-spacing: 0.1em;
    text-transform: uppercase;
    margin-bottom: 4px;
}

.section-heading-jp {
    display: block;
    font-size: 35px;
    font-weight: 700;
    color: #333;
}

@media (min-width: 768px) {
    .section-heading {
        margin-bottom: 80px;
    }
    .section-heading-jp {
        font-size: 2rem;
    }
}

/* Swiper Fade Effect Adjustment */
.swiper-fade .swiper-slide {
    pointer-events: none;
    transition-property: opacity;
}

.swiper-fade .swiper-slide-active {
    pointer-events: auto;
}

/* Accordion Custom */
.accordion-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out;
}

.accordion-item.active .accordion-content {
    max-height: 500px;
}

.accordion-item.active .chevron {
    transform: rotate(180deg);
}

/* Back to Top Button Animation */
#topBtn {
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all 0.4s cubic-bezier(0.165, 0.84, 0.44, 1);
}

#topBtn.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

/* SP Menu Overlay */
#sp-menu-overlay {
    z-index: 1000;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s;
}

#sp-menu-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

/* Swiper Gallery Image Size */
.gallery-swiper .swiper-slide img {
    width: 100%;
    height: auto;
    max-width: 100%;
}

/* Custom UI - Premium Button Styles */
.btn-premium {
    transition: all 0.3s;
    box-shadow: 0 4px 14px 0 rgba(129, 216, 208, 0.39);
}

.btn-premium:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(129, 216, 208, 0.5);
}

/* Swiper Voice Style */
.voice-card {
    background: #fff;
    padding: 2rem;
    border: 1px solid #f0f0f0;
    height: 100%;
}

/* Responsive image gap fix */
img {
    vertical-align: bottom;
}