:root {
    /* base */
    --unit: 8rem;
    --base-vw: 1710;
    --vw: 100vw;
    --section-scale: calc(1280 / 1710);

    /* spacing */
    --space-0-5: calc(var(--unit) * .5);
    --space-1: calc(var(--unit) * 1);
    --space-1-5: calc(var(--unit) * 1.5);
    --space-2: calc(var(--unit) * 2);
    --space-3: calc(var(--unit) * 3);
    --space-4: calc(var(--unit) * 4);
    --space-5: calc(var(--unit) * 5);
    --space-6: calc(var(--unit) * 6);
    --space-8: calc(var(--unit) * 8);
    --space-9: calc(var(--unit) * 9);
    --space-10: calc(var(--unit) * 10);

    /* font */
    --font-mincho: "yu-mincho-pr6n", sans-serif;
    --font-optima: "optima-lt-pro", sans-serif;

    /* colors */
    --primary: #555;
    --accent: #bbb06c;
    --rose: rgb(239 90 91 / 1);
    --scalp: rgb(8 168 171 / 1);
    --repair: #73e6ac;
}
@media (max-width: 768px) {
  :root { 
    --base-vw: 768;
    }
}
html {
    scroll-behavior: smooth;
    font-size: calc(100vw / var(--base-vw));
}
body {
    font-size: 16rem;
    font-family: var(--font-noto);
    color: var(--primary);
}
.l-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    overflow: clip;
}
.bg {
    position: fixed;
    z-index: -1;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}
.bg::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background-image: url(images/bg.jpg);
    background-position: center;
    background-size: cover;
    background-repeat: no-repeat;
}
.inner {
    width: calc(var(--vw, 100vw) * var(--section-scale));
    margin-inline: auto;
    padding-top: var(--space-10);
}
.main_heading {
    font-size: 32rem;
    font-family: var(--font-mincho);
    background: linear-gradient(45deg, #B89543 0%, #BBB06C 49%, #B89543 100%);
    color: transparent;
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    text-align: center;
    line-height: 1.875;
}
.main_heading .txt-sm {
    display: inline-block;
    padding: 0 4rem 0 2rem;
    font-size: 18rem;
    vertical-align: 35%;
}
small.caution {
    display: block;
    padding-top: 60rem;
    text-align: right;
}
br.sp {
    display: none;
}
@media screen and (max-width: 768px) {
    html {
        font-size: 0.8px;
    }
    .inner {
        width: auto;
        padding-inline: 30rem;
    }
    .main_heading {
        font-size: 24rem;
        line-height: 1.5;
    }
    .main_heading .txt-sm {
        vertical-align: 20%;
    }
    br.pc {
        display: none;
    }
    br.sp {
        display: block;
    }
    small.caution {
        padding-top: 40rem;
    }
}
@media screen and (max-width: 500px) {
    .main_heading {
        text-align: left;
    }
}


.mv {
    width: 100vw;
    height: 100dvh;
}
.mv_image  {
    width: 100%;
    height: 100%;
    object-fit: cover;
}
.intro {
    text-align: center;
}
.intro_desc {
    padding-top: 20rem;
    font-size: 18rem;
    line-height: 2;
}
@media screen and (max-width: 500px) {
    .intro_desc {
        text-align: left;
    }
}

.product .inner {
    padding-top: 120rem;
}
.product_heading {
    display: flex;
    justify-content: center;
    width: 100%;
    font-family: var(--font-optima);
    font-weight: 400;
    font-size: 40rem;
    color: rgba(0, 0, 0, 0);
    line-height: 1;
    -webkit-background-clip: text;
    background-clip: text;
    background-image: url(../img/hairmilk/liner-bg.png);
    background-position: center;
    background-repeat: no-repeat;
}
.product_list {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 40rem;
    padding-top: 40rem;
}
.product_thumb {
    padding: 40rem;
    border-radius: 11rem;
    background-color: rgb(251 224 174 / .2);
    text-align: center;
}
.product_item:nth-child(2) .product_thumb {
    background-color: rgb(239 90 91 / .2);
}
.product_item:nth-child(3) .product_thumb {
    background-color: rgb(8 168 171 / .2);
}
.product_item:nth-child(4) .product_thumb {
    background-color: rgb(168 244 205 / .2);
}
.product_thumb_image {
    width: 125rem;
}
.product_name {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 125rem;
    padding-top: 16rem;
    font-size: 24rem;
    font-family: var(--font-mincho);
    text-align: center;
}
.product_item:nth-child(2) .product_name {
    color: var(--rose);
}
.product_item:nth-child(3) .product_name {
    color: var(--scalp);
}
.product_item:nth-child(4) .product_name {
    color: var(--repair);
}
.product_price {
    padding-top: 12rem;
    font-family: var(--font-noto);
    text-align: center;
}
.product_price .txt-sm {
    font-size: 14rem;
}
.product_price .yen{
    font-size: 24rem;
}
.product_price .num {
    padding-left: 8rem;
    font-size: 32rem;
    font-family: var(--font-optima);
}
.product_text {
    padding-top: 16rem;
    line-height: 1.875;
}
@media screen and (max-width: 768px) {
    .product_list {
        grid-template-columns: repeat(2, 1fr);
    }
}
@media screen and (max-width: 500px) {
    .product_list {
        grid-template-columns: 1fr;
    }
    .product_name {
        display: block;
        min-height: auto;
    }
    .product_name,
    .product_desc,
    .product_price {
        text-align: left;
    }
}


.feature .inner {
    max-width: 980rem;
    padding-top: 120rem;
    overflow: hidden;
}
.feature_cont {
    padding-top: 60rem;
}
.feature_cont_item {
    padding-top: 40rem;
    display: flex;
    align-items: center;
    gap: 40rem;
}
.feature_graph {
    width: 50%;
}
.feature_desc {
    font-size: 18rem;
    line-height: 1.875;
}
.feature_care {
    padding-top: 80rem;
}
.feature_heading {
    gap: 20rem;
    position: relative;
    font-family: var(--font-mincho);
    font-size: 24rem;
    overflow: hidden;
}
.feature_heading::after {
    content: "";
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    height: 1px;
    width: 100%;
    margin-left: 12rem;
    background-color: var(--primary);
}
.feature_care_heading {
    display: flex;
    align-items: center;
}
.feature_care .feature_heading::after {
    display: none;
}
.feature_heading_en {
    display: inline-block;
    font-family: var(--font-optima);
    font-weight: 400;
    font-size: 32rem;
    color: rgba(0, 0, 0, 0);
    line-height: 1;
    -webkit-background-clip: text;
    background-clip: text;
    background-image: url(../img/hairmilk/liner-bg.png);
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
}
.feature_care_cont {
    background-color: rgb(255 253 249 / .6);
    border-radius: 11rem;
    border: 1px solid var(--accent);
    padding: 60rem;
}
.feature_care_cont:nth-child(2) {
    margin-top: 60rem;
}
.feature_care_text {
    padding-top: 20rem;
    font-size: 18rem;
    line-height: 1.875;
}
.feature_care_text .txt-sm {
    display: inline-block;
    padding: 0 4rem 0 2rem;
    font-size: 12rem;
    vertical-align: 20%;
}
.feature_care_list {
    max-width: 800rem;
    margin-inline: auto;
    padding-top: 40rem;
}
.feature_care_item:nth-child(n+2) {
    padding-top: 40rem;
}
.feature_care_name {
    list-style: disc;
    font-family: var(--font-mincho);
    font-size: 20rem;
    color: #9C8B7B;
}
.feature_care_desc {
    padding-top: 8rem;
    line-height: 1.875;
}
@media screen and (max-width: 768px) {
    .feature_cont_item {
        flex-direction: column;
    }
}
@media screen and (max-width: 500px) {
    .feature_heading::after {
        display: none;
    }
    .feature_cont_item {
        flex-direction: column;
    }
    .feature_graph {
        width: 85%;
    }
    .feature_care_heading {
        flex-direction: column;
    }
    .feature_care_cont {
        padding: 50rem 30rem;
    }
}


.tech {
    margin-top: 120rem;
    background-color: rgba(218, 207, 189, .5);
}
.tech .inner {
    max-width: 980rem;
    padding-bottom: 80rem;
}
.tech_heading {
    padding-bottom: 40rem;
   text-align: left;
   line-height: 1.5;
   border-bottom: 1px solid var(--accent);
}
.tech_cont {
    padding: 40rem 60rem;
    border-top: 1px solid var(--accent);
}
.tech_item_name {
    font-size: 24rem;
    font-family: var(--font-mincho);
}
.tech_item:first-child .tech_item_name {
    font-family: var(--font-optima);
}
.tech_item_name .txt-sm {
    display: inline-block;
    padding-left: 2rem;
    font-size: 12rem;
    vertical-align: 50%;
}
.tech_item_name .en {
    font-family: var(--font-optima);
}
.tech_item:nth-child(n+2) {
    padding-top: 40rem;
}
.tech_item_desc {
    padding-top: 4rem;
    line-height: 1.875;
}
@media screen and (max-width: 500px) {
    .tech_cont {
        padding: 40rem 20rem 0;
    }
}


.page_top {
    margin: 60rem 0;
    text-align: center;
}
.page_top_btn {
    text-align: center;
    border: none;
}
.page_top_circle {
    position: relative;
    display: block;
    margin: auto;
    width: 55rem;
    height: 55rem;
    border-radius: 50%;
    background-image: url(../img/hairmilk/page-top-bg.png);
    background-size: contain;
    background-repeat: no-repeat;
}
.page_top_circle:before {
    content: "";
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%,-50%);
    border-bottom: 7rem solid var(--accent);
    border-right: 7rem solid transparent;
    border-left: 7rem solid transparent;
}
.page_top_text {
    margin-top: 10rem;
    font-family: var(--font-optima);
    font-weight: 400;
    color: var(--accent);
}


.totop {
    position: fixed;
    bottom: 30rem;
    right: 40rem;
    width: 160rem;
    height: 40rem;
}
.totop_link {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
    height: 100%;
    border: 1px solid #555;
    background-color: rgba(255, 255, 255, .5);
    font-size: 12rem;
}
.totop_arrow {
    position: absolute;
    top: 50%;
    right: 16rem;
    transform: translateY(-50%);
    width: 0;
    height: 0;
    border-top: 5rem solid transparent;
    border-bottom: 5rem solid transparent;
    border-left: 7rem solid rgba(85, 85, 85, .7);
}
@media screen and (max-width: 500px) {
    .totop {
        position: fixed;
        right: 20rem;
    }
}