@import url('https://fonts.googleapis.com/css2?family=Shippori+Mincho:wght@400;700&display=swap');

body {
    margin: 0;
    padding: 0;
    background: #f0f0f0;
}

#customer_header {
    width: 100%;
    font-family: "Shippori Mincho", "Noto Serif JP", serif;
    background: #fff;
    margin-bottom: 20px;
}

/* Logo Area */
.customer_logo_area {
    position: absolute;
    top: 40px;
    left: 40px;
    z-index: 100;
}

.customer_logo_area img {
    height: 45px;
    width: auto;
    display: block;
    filter: drop-shadow(0 2px 15px rgba(0,0,0,0.4));
}

/* Vertical Slogan */
.customer_sub_title_vertical {
    position: absolute;
    right: 15%;
    top: 75px;
    writing-mode: vertical-rl;
    font-size: 20px;
    letter-spacing: 0.4em;
    line-height: 1.8;
    text-shadow: 0 2px 20px rgba(0,0,0,0.5);
    z-index: 100;
    color: #fff;
}

.customer_sub_title_vertical span {
    display: block;
    margin-left: 10px;
}

/* Banner Area - Compact & Integrated */
.customer_main_banner {
    position: relative;
    width: 100%;
    min-height: 700px;
    background: url('https://storage.489ban.net/storage/customer/1335/fv01-scaled.jpg') center 27% / cover no-repeat;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    align-items: center;
    color: #fff;
}

.customer_main_banner::after {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(to bottom, 
        rgba(0,0,0,0.1) 0%, 
        transparent 30%, 
        transparent 60%, 
        rgba(10,21,48,0.5) 85%, 
        #0a1530 100%);
    pointer-events: none;
}

.customer_banner_content {
    position: relative;
    z-index: 1;
    width: 100%;
    max-width: 1400px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 220px auto 0;
    padding-bottom: 20px;
}

.customer_hero_text {
    text-align: center;
    animation: fadeUp 1.2s cubic-bezier(0.23, 1, 0.32, 1);
}

.customer_en_tagline {
    font-size: 18px;    
    margin-bottom: 10px;
    letter-spacing: 0.15em;
    text-shadow: 0 2px 15px rgba(0,0,0,0.5);
}

.customer_main_title {
    font-weight: 500;
    font-size: 64px;
    letter-spacing: 0.17em;
    text-transform: uppercase;
    margin: 0;
    line-height: 1;
    text-shadow: 0 4px 25px rgba(0,0,0,0.7);
}

/* Navigation - Floating organically in the sea */
.customer_nav_wrapper {
    position: relative;
    z-index: 100;
    margin-top: 150px; 
    padding-bottom: 15px;
    width: 100%;
}

.customer_button_container {
    max-width: 850px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    padding: 0 20px;
    box-sizing: border-box;
}

.customer_dropdown_container { 
    position: relative; 
    opacity: 0;
    animation: fadeIn 0.8s ease-out 0.4s forwards;
    width: 100%;
}

.customer_dropdown_container:hover { z-index: 1001; }

.customer_filter_btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 20px 10px;
    color: #fff;
    text-decoration: none;
    border: 1px solid rgba(255, 255, 255, 0.15);
    background: rgba(10, 21, 48, 0.4); 
    backdrop-filter: blur(1px);
    transition: all 0.5s cubic-bezier(0.19, 1, 0.22, 1);
    cursor: pointer;
    width: 100%;
    box-sizing: border-box;
}

.customer_filter_btn:hover {
    background: #fff;
    color: #0a1530;
    border-color: #fff;
    transform: translateY(-4px);
    box-shadow: 0 15px 40px rgba(0,0,0,0.5);
}

.customer_btn_en {
    font-size: 11px;
    letter-spacing: 0.2em;
    margin-bottom: 4px;
    color: #dee041;
    opacity: 1;
}

.customer_btn_jp {
    font-size: 16px;
    font-weight: 500;
    letter-spacing: 0.18em;
}

.customer_filter_btn:hover .customer_btn_en {
    color: #c9a063;
    opacity: 1; 
}

.customer_has_dropdown::after {
    content: "";
    position: absolute;
    bottom: 12px;
    right: 12px;
    width: 5px;
    height: 5px;
    border-right: 1px solid #c9a063;
    border-bottom: 1px solid #c9a063;
    transform: rotate(45deg);
}

/* Dropdown Menu */
.customer_dropdown_menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background: #fff;
    box-shadow: 0 25px 50px rgba(0,0,0,0.6);
    z-index: 1000;
    padding: 15px 0;
    border-top: 3px solid #c9a063;
}

.customer_dropdown_menu::before {
    content: "";
    position: absolute;
    top: -15px;
    left: 0;
    width: 100%;
    height: 15px;
    background: transparent;
}

.customer_dropdown_container:hover .customer_dropdown_menu { display: block; }

.customer_dropdown_item {
    display: block;
    padding: 12px 20px;
    color: #0a1530;
    text-decoration: none;
    font-size: 14px;
    letter-spacing: 0.15em;
    text-align: center;
}

.customer_dropdown_item:hover { color: #d4a72c; background: #f8faff; }

@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes fadeUp { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }

/* Mobile */
@media (max-width: 768px) {
    .customer_main_banner { min-height: 700px; background-position: center 55%; }
    .customer_logo_area { top: 20px; left: 20px; }
    .customer_logo_area img { height: 25px; }
    .customer_sub_title_vertical { font-size: 14px; right: 20px; top: 20px; }
    .customer_banner_content { margin-top: 140px; }
    .customer_main_title { font-size: 30px; }
    .customer_en_tagline { margin-top: 40px; font-size: 12px; }
    .customer_nav_wrapper { margin-top: 120px; padding-bottom: 15px; }
    .customer_filter_btn { padding: 15px; }
    .customer_button_container { grid-template-columns: repeat(2, 1fr); gap: 10px; }
}