html,
body {
    height: 100%;
    margin: 0;
    padding: 0;
    font-family: 'Montserrat', Arial, sans-serif;
    background: #d6d6d6;
    overflow: hidden;
}

body {
    min-height: 100vh;
    width: 100vw;
    overflow-x: hidden;
}

.container {
    max-width: 1310px;
    background: #fff;
    height: 90vh;
    max-height: 90vh;
    margin: 15px auto;
    border: 4px solid #222;
    box-shadow: 0 8px 32px #4443;
    min-height: 95vh;
    position: relative;
    display: flex;
    flex-direction: column;
    padding: 0;
    overflow: hidden;
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 18px 35px 8px 35px;
    font-size: 14px;
    z-index: 10;
    flex-wrap: wrap;
}

.navbar .brand {
    font-weight: bold;
    letter-spacing: 2px;
    margin-right: 20px;
    font-size: .9rem;
    color: #111;
}

.navbar ul {
    list-style: none;
    display: flex;
    flex-direction: row;
    gap: 24px;
    margin: 0;
    padding: 0;
    flex-wrap: wrap;
}

.navbar ul li a {
    text-transform: uppercase;
    color: #de2b2f;
    text-decoration: none;
    font-weight: bold;
    opacity: 1;
    z-index: 2;
    font-size: 1em;
    border-bottom: none;
    transition: border-bottom 0.2s, padding-bottom 0.2s;
}

.navbar ul li a:hover,
.navbar ul li a.active {
    border-bottom: 2px solid #de2b2f;
    padding-bottom: 2px;
}

.navbar .utils {
    display: flex;
    align-items: center;
    gap: 18px;
    font-family: monospace;
    font-size: 1em;
}

.navbar .menu-icon {
    width: 20px;
    height: 20px;
    background: #222;
    mask: url('data:image/svg+xml;utf8,<svg fill="white" viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg"><rect y="5" width="24" height="2"></rect><rect y="11" width="24" height="2"></rect><rect y="17" width="24" height="2"></rect></svg>') center/contain no-repeat;
    -webkit-mask: url('data:image/svg+xml;utf8,<svg fill="white" viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg"><rect y="5" width="24" height="2"></rect><rect y="11" width="24" height="2"></rect><rect y="17" width="24" height="2"></rect></svg>') center/contain no-repeat;
}

.main-card {
    position: relative;
    flex: 1 1 auto;
    padding: 0 35px 35px 35px;
    text-align: left;
    background: #fff;
    min-height: 700px;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
}

.background-text {
    font-size: 5vw;
    font-weight: 900;
    color: #111;
    opacity: 1;
    letter-spacing: -0.07em;
    text-transform: uppercase;
    position: relative;
    z-index: 1;
    white-space: nowrap;
    margin-top: 2vw;
    margin-bottom: 0;
    line-height: 1;
    display: block;
    transform: translateX(-1.5%);
}

.red-kanji {
    position: absolute;
    left: 8vw;
    top: 6vw;
    font-size: 6vw;
    font-family: 'Noto Sans JP', Arial, sans-serif;
    color: #de2b2f;
    font-weight: bold;
    z-index: 2;
    opacity: 1;
    user-select: none;
    filter: drop-shadow(0 3px 3px #de2b2f);
    white-space: nowrap;
}

.center-mask {
    display: block;
    width: 6vw;
    min-width: 60px;
    max-width: 120px;
    z-index: 10;
    position: relative;
    margin-top: 2vw;
    margin-bottom: 2vw;
    transform: translateX(-20%) translateY(-20%);
    object-fit: contain;
}

.subtitle {
    margin-top: 1vw;
    font-size: 1.8vw;
    color: #222;
    letter-spacing: 2px;
    font-family: 'Montserrat', Arial, sans-serif;
    font-weight: bold;
    z-index: 2;
    position: relative;
    top: -.5vw;
    transform: translateX(-1.05%);
}

.warning {
    font-size: .9em;
    margin: 1px 0 8px 0;
    color: #555;
    font-family: 'Montserrat', Arial, sans-serif;
    z-index: 2;
    position: relative;
    text-transform: uppercase;
    top: -0.2vw;
    transform: translateX(-2%);
    max-width: 100%;
    word-break: break-word;
    width: 40vw;
}

.warning1 {
    font-size: .9em;
    margin: 1px 0 8px 0;
    color: #555;
    font-family: 'Montserrat', Arial, sans-serif;
    z-index: 2;
    position: relative;
    text-transform: uppercase;
    top: -0.2vw;
    transform: translateX(-2%);
    max-width: 100%;
    word-break: break-word;
    width: 40vw;
}

.serial {
    font-family: 'JetBrains Mono', 'Courier New', monospace;
    font-size: 1.4em;
    margin-bottom: 35px;
    margin-top: 8px;
    letter-spacing: 2px;
    color: #24282b;
    position: relative;
    top: 13vw;
    transform: translateX(-1.75%);
}

.barcode-row {
    display: flex;
    flex-direction: row;
    align-items: flex-end;
    justify-content: space-between;
    margin-top: 30px;
    margin-bottom: 10%;
    position: relative;
    top: 6.75vw;
    transform: translateX(-1.75%);
    flex-wrap: wrap;
    width: 100%;
    gap: 16px;
}

.barcode-row img,
.barcode-row svg {
    height: 56px;
    margin-right: 0;
}

.wave-graph {
    height: 36px;
    min-width: unset;
    margin-bottom: 12px;
    transform: translateX(15%);
}


/* Background image */

.bg-img {
    position: absolute;
    top: 0%;
    left: 36%;
    width: 100%;
    height: 100%;
    object-fit: cover;
    z-index: 1;
    opacity: 1;
    pointer-events: none;
}


/* Responsive adjustments */

@media (max-width: 900px) {
    .navbar .menu-icon {
        opacity: 0;
        position: relative;
        top: -10%;
    }
    .navbar ul li a {
        position: relative;
        size: 90%;
        gap: 12px;
        top: -10%;
    }
    .navbar .brand,
    .navbar .utils span {
        opacity: 0;
    }
    .container {
        max-width: 95%;
        max-height: 100vh;
        border-width: 3px;
    }
    .main-card {
        padding: 0 12px 22px 12px;
        min-height: 60vw;
    }
    .background-text {
        font-size: 5vw !important;
        transform: translateY(-50%) translateX(-2%);
    }
    .red-kanji {
        font-size: 9vw !important;
        transform: translateX(40%) translateY(-55%);
    }
    .center-mask {
        width: 5vw;
        max-width: 120px;
        transform: translateX(-13%) translateY(-50%);
    }
    .barcode-row {
        font-size: 1em;
        transform: translateY(61%) translateX(-3%);
    }
    .serial {
        font-size: 1em;
        transform: translateX(-2%);
        top: 47vw;
    }
    .subtitle {
        transform: translateY(27%) translateX(-2%);
    }
    .subtitle {
        font-size: 1.2em;
    }
    .warning {
        font-size: .8em;
        width: 65vw;
    }
    .bg-img {
        left: 0;
        width: 100%;
        height: 100%;
        opacity: 0.2;
    }
}

@media (max-width: 650px) {
    .navbar {
        padding: 10px 12px;
    }
    .navbar ul {
        gap: 8px;
    }
    .background-text,
    .red-kanji {
        font-size: 13vw !important;
    }
    .center-mask {
        width: 38vw;
        min-width: 45px;
        max-width: 100px;
    }
    .barcode-row {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }
    .main-card {
        padding: 0 4vw 8vw 4vw;
    }
    .red-kanji {
        left: 8vw;
        top: 18vw;
    }
}

@media (max-width: 480px) {
    /* body {
        overflow: auto;
    } */
    .container {
        border-width: 2px;
        overflow: auto;
    }
    .background-text {
        font-size: 18vw !important;
    }
    .red-kanji {
        font-size: 17vw !important;
        left: 6vw;
        top: 21vw;
    }
    .subtitle {
        font-size: 1.5em;
        margin-top: 8px;
        position: static;
        transform: translateX(-3%) translateY(170%);
    }
    .warning {
        font-size: 1em;
        width: 80vw;
        transform: translateX(-3%) translateY(25%);
    }
    .warning1 {
        font-size: 1em;
        width: 80vw;
        transform: translateX(-3%) translateY(75%);
    }
    .barcode-row {
        transform: translateX(-3%) translateY(10%);
    }
    .serial {
        top: 12.5dvh;
        transform: translateX(-3%);
    }
}

@media (max-width: 380px) {
    .background-text {
        font-size: 15vw !important;
    }
    .red-kanji {
        font-size: 15vw !important;
        left: 5vw;
        top: 20vw;
    }
    .center-mask {
        width: 35vw;
        min-width: 35px;
        max-width: 80px;
    }
    .subtitle {
        font-size: 1.2em;
        transform: translateY(30%) translateX(-3%);
    }
    .warning {
        font-size: 0.8em;
        transform: translateY(5%) translateX(-3%);
    }
    .warning1 {
        font-size: 0.8em;
        transform: translateY(20%) translateX(-3%);
    }
    .serial {
        font-size: 0.9em;
        transform: translateY(20%) translateX(-3%);
    }
}