@charset "utf-8";
/* 共通設定
========================================================================== */
html {
    font-size: 62.5%;
    /* 10px */
}
*,
*::before,
*::after {
    box-sizing: border-box;
    -webkit-box-sizing: border-box;
}
body {
    min-width: inherit;
    color: #333;
    font-size: 1.6rem;
    line-height: 1.6;
    font-weight: 500;
    font-family: "Noto Sans JP", "Hiragino Sans", "ヒラギノ角ゴ Pro", "Hiragino Kaku Gothic Pro", "メイリオ", "Meiryo", sans-serif;
    height: 100vh;
}
a {
    color: #000000;
    text-decoration: none;
}
img {
    max-width: 100%;
    vertical-align: bottom;
}
ul, ol {
    list-style: none;
}
.container {
    position: relative;
    width: 100%;
    margin: 0 auto;
    box-shadow: 0 0 calc(10 * 100vw / 750) rgba(0, 0, 0, .16);
    background-color: #ffffff;
}

@media screen and (min-width: 751px) {
.container {
    width: min(calc(1200 * 100vw / 1200), 1200px);
    box-shadow: 0 0 min(calc(10 * 100vw / 1200), 10px) rgba(0, 0, 0, .16);
}
}

/* SP・PC 表示切替え
---------------------------------------------------------- */
@media screen and (min-width: 751px) {
.is-pc {
    display: block;
}
.is-sp {
    display: none;
}
}
@media screen and (max-width: 750px) {
.is-pc {
    display: none;
}
.is-sp {
    display: block;
}
}

/* タグ
---------------------------------------------------------- */
#tag {
    position: absolute;
    top: 0;
    left: 0;
    width: 1px;
    height: 1px;
    overflow: hidden;
}
/* 思い出の年賀状を見る ボタン
---------------------------------------------------------- */
.btn_main {
    position: relative;
    margin-inline: auto;
    width: calc(600 * 100vw / 750);
    background: #FF6B00;
    background: linear-gradient(90deg, #FF6B00 0%, #FF6B00 100%);
    border-radius: calc(10 * 100vw / 750);
}
.btn_main a {
    position: relative;
    padding: calc(49 * 100vw / 750) 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: calc(12 * 100vw / 750) 0;
    border-radius: calc(10 * 100vw / 750);
    box-shadow: calc(10 * 100vw / 750) calc(10 * 100vw / 750) calc(15 * 100vw / 750) rgba(0, 0, 0, .30);
    transition: .3s all;
}
:is(.btn_main-desc,.btn_main-caution) {
    color: #fff;
}
.btn_main-desc {
    font-size: calc(46 * 100vw / 750);
    font-weight: 700;
    line-height: 1;
    letter-spacing: .03em;
    display: flex;
    align-items: center;
}
.btn_main-desc span {
    position: relative;
    left: calc(6 * 100vw / 750);
    width: calc(44 * 100vw / 750);
    height: calc(44 * 100vw / 750);
    border-radius: 50%;
    background: #ffffff;
}
.btn_main-desc span::after {
    content: "";
    width: calc(17 * 100vw / 750);
    height: calc(22 * 100vw / 750);
    position: absolute;
    top: 50%;
    left: 56%;
    background: #FF6B00;
    transform: translate(-50%, -50%);
    clip-path: polygon(0 0, 0 100%, 100% 50%);
    transition: .3s all;
}
.btn_main-caution {
    font-size: calc(28 * 100vw / 750);
    font-weight: 700;
    letter-spacing: .05em;
}

@media screen and (min-width: 751px) {
.btn_main {
    width: min(calc(560 * 100vw / 1200), 560px);
    border-radius: min(calc(10 * 100vw / 1200), 10px);
    transition: .3s all;
}
.btn_main::before {
    content: "";
    height: 100%;
    left: 0;
    position: absolute;
    top: 0;
    transition: all .3s ease-out;
    width: 100%;
    border-radius: min(calc(10 * 100vw / 1200), 10px);
    background: #FF5E3B;
    background: linear-gradient(90deg, #FF2990 0%, #FF5E3B 100%);
    opacity: 0;
}
.btn_main a {
    padding: min(calc(32 * 100vw / 1200), 32px) 0 min(calc(28 * 100vw / 1200), 28px);
    gap: min(calc(8 * 100vw / 1200), 8px) 0;
    border-radius: min(calc(10 * 100vw / 1200), 10px);
    box-shadow: min(calc(10 * 100vw / 1200), 10px) min(calc(10 * 100vw / 1200), 10px) min(calc(15 * 100vw / 1200), 15px) rgba(0, 0, 0, .30);
}
.btn_main-desc {
    font-size: min(calc(40 * 100vw / 1200), 40px);
    letter-spacing: .05em;
}
.btn_main-desc span {
    left: min(calc(8 * 100vw / 1200), 8px);
    width: min(calc(38 * 100vw / 1200), 38px);
    height: min(calc(38 * 100vw / 1200), 38px);
}
.btn_main-desc span::after {
    content: "";
    width: min(calc(15 * 100vw / 1200), 15px);
    height: min(calc(19 * 100vw / 1200), 19px);
}
.btn_main-caution {
    font-size: min(calc(22 * 100vw / 1200), 22px);
}
.btn_main:hover {
    transform: scale(1.05);
}
.btn_main:hover::before {
    opacity: 1;
}
.btn_main:hover .btn_main-desc span::after {
    background: #FF5844;
}
}

/* top
========================================================================== */
.top {
    font-family: "Noto Sans JP", sans-serif;
    position: relative;
}
.logo_text {
    font-size: calc(16 * 100vw / 750);
    margin-bottom: calc(4 * 100vw / 750);
    color: #fff;
}
.top_logo {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 2%;
    left: 2%;
    line-height: 1.6;
}
.header_logo-link {
    width: calc(310 * 100vw / 750);
    min-width: 140px;
    line-height: 1;
}
.header_logo-images {
    width: 100%;
}

@media screen and (min-width: 751px) {
.top {
    position: relative;
}
.top_logo {
    top: 2%;
    line-height: 2;
}
.logo_text {
    font-size: min(calc(11 * 100vw / 1200), 11px);
    margin-bottom: 0;
}
.header_logo-link {
    width: min(calc(290 * 100vw / 1200), 290px);
}
}

/* entrance
========================================================================== */
.entrance {
    margin: calc(86 * 100vw / 750) calc(32 * 100vw / 750) calc(142 * 100vw / 750);
}
.entrance h2 {
    margin-bottom: calc(48 * 100vw / 750);
    font-size: calc(38 * 100vw / 750);
    font-weight: 900;
    letter-spacing: .07em;
    text-align: center;
    color: #FF7A1F;
}
.entrance_wrap {
    margin-bottom: calc(104 * 100vw / 750);
    font-size: calc(30 * 100vw / 750);
    line-height: 1.8;
    display: flex;
    flex-direction: column;
    gap: calc(60 * 100vw / 750) 0;
}

@media screen and (min-width: 751px) {
.entrance {
    margin: min(calc(72 * 100vw / 1200), 72px) auto min(calc(126 * 100vw / 1200), 126px);
}
.entrance h2 {
    margin-bottom: min(calc(44 * 100vw / 1200), 44px);
    font-size: min(calc(38 * 100vw / 1200), 38px);
}
.entrance_wrap {
    margin-bottom: min(calc(92 * 100vw / 1200), 92px);
    font-size: min(calc(23 * 100vw / 1200), 23px);
    letter-spacing: 0;
    gap: min(calc(48 * 100vw / 1200), 48px) 0;
    text-align: center;
}
}

/* howto
========================================================================== */
.howto {
    margin: 0 calc(68 * 100vw / 750) calc(24 * 100vw / 750);
}
.howto h3 {
    margin: 0 auto calc(104 * 100vw / 750);
    padding: calc(18 * 100vw / 750) 0;
    width: calc(550 * 100vw / 750);
    font-size: calc(36 * 100vw / 750);
    font-weight: 700;
    line-height: 1;
    letter-spacing: .03em;
    text-align: center;
    color: #FF7A1F;
    border: 3px solid #FF7A1F;
    border-radius: calc(27 * 100vw / 750);
}
.howto dl {
    margin-bottom: calc(152 * 100vw / 750);
    display: flex;
    flex-direction: column;
    gap: calc(140 * 100vw / 750) 0;
}
.howto_item {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: calc(44 * 100vw / 750) 0;
    counter-increment: count 1;
}
.howto_item::before {
    font-family: "Notable", sans-serif;
    content: counter(count) "";
    font-size: calc(132* 100vw / 750);
    font-weight: 900;
    position: absolute;
    top: 0;
    left: 0;
    color: #FF7A1F;
    transform: translateY(-50%);
}
.howto_images {
    width: calc(572 * 100vw / 750);
}
.howto_desc {
    font-size: calc(28 * 100vw / 750);
    line-height: 2;
    text-align: justify;
}
.howto_caution {
    font-size: calc(26 * 100vw / 750);
    line-height: 2;
}

@media screen and (min-width: 751px) {
.howto {
    margin: 0 min(calc(107 * 100vw / 1200), 107px) min(calc(24 * 100vw / 1200), 24px);
}
.howto h3 {
    margin: 0 auto min(calc(68 * 100vw / 1200), 68px);
    padding: min(calc(14 * 100vw / 1200), 14px) 0 min(calc(17 * 100vw / 1200), 17px);
    width: min(calc(500 * 100vw / 1200), 500px);
    font-size: min(calc(31 * 100vw / 1200), 31px);
    border-radius: min(calc(27 * 100vw / 1200), 27px);
}
.howto dl {
    margin-bottom: min(calc(130 * 100vw / 1200), 130px);
    gap: min(calc(70 * 100vw / 1200), 70px) 0;
}
.howto_item {
    display: flex;
    gap: 0 min(calc(56 * 100vw / 1200), 56px);
}
.howto_item:nth-child(odd) {
    flex-direction: row;
}
.howto_item:nth-child(even) {
    flex-direction: row-reverse;
}

.howto_item::before {
    font-size: min(calc(110 * 100vw / 1200), 110px);
    transform: translateY(-50%);
}
.howto_item:nth-child(even)::before {
    left: initial;
    right: 0;
}
.howto_images {
    width: min(calc(480 * 100vw / 1200), 480px);
}
.howto_desc {
    width: min(calc(404 * 100vw / 1200), 404px);
    font-size: min(calc(21 * 100vw / 1200), 21px);
}
.howto_caution {
    font-size: min(calc(18 * 100vw / 1200), 18px);
}
}

/* footer
========================================================================== */
.footer {
    font-family: "Noto Sans JP", sans-serif;
    position: relative;
    height: calc(1219*100vw/750);
}
.footer::after {
    content: "";
    background: url("../images/bg_footer_s.webp") no-repeat center center / cover;
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
}
.footer_inner {
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 100%;
    z-index: 10;
}
.footer_btn {
    margin: 0 auto calc(72* 100vw / 750);
    width: calc(580* 100vw / 750);
    display: flex;
    flex-direction: column;
    gap: calc(36* 100vw / 750);
}
.footer_btn-20th {
    background: #FF5E3B;
}
.footer_btn a{
    position: relative;
    padding: calc(12* 100vw / 750) 0;
    font-size: calc(38* 100vw / 750);
    font-weight: 700;
    letter-spacing: .05em;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    border-radius: calc(44* 100vw / 750);
}
.footer_btn-arrow {
    position: relative;
    left: calc(8* 100vw / 750);
    width: calc(38* 100vw / 750);
    height: calc(38* 100vw / 750);
    border-radius: 50%;
    background: #ffffff;
}
.footer_btn-arrow::after {
    position: absolute;
    content: "";
    top: 50%;
    left: 58%;
    transform: translate(-50%, -50%);
    width: calc(15* 100vw / 750);
    height: calc(20* 100vw / 750);
    clip-path: polygon(0 0, 0 100%, 100% 50%);
}
.footer_btn-20th,
.footer_btn-20th .footer_btn-arrow::after {
    background: #83AEFF
}
.footer_btn-20th {
    background: linear-gradient(90deg, #fe9b71 0%, #e687cb 33%, #8d82f0 67%, #5ebdeb 100%);;
}
.footer_btn-top,
.footer_btn-top .footer_btn-arrow::after {
    background: #EE0000;
}
/* bottom
-------------------------------------------------------------------------- */
.bottom {
    padding: calc(20 * 100vw / 750) 0;
    font-size: calc(24 * 100vw / 750);
    letter-spacing: .02em;
    background: #FF6B00;
    color: #fff;
}
.bottom a {
    color: #fff;
}
/* bread */
.bread_list {
    display: flex;
    justify-content: center;
    margin-bottom: calc(8 * 100vw / 750);
}
.bread_item:not(:last-child)::after {
    padding: 0 calc(8 * 100vw / 750);
    content: "＞";
}
/* copy */
.copyright {
    text-align: center;
}
.copyright_link {
    text-decoration: underline;
}
.copyright_link:hover {
    text-decoration: none;
}

@media screen and (min-width: 751px) {
.footer {
    height: min(calc(980 * 100vw / 1200), 980px);
}
.footer::after {
    background: url("../images/bg_footer.webp") no-repeat center center / cover;
}
.footer_btn {
    margin: 0 auto min(calc(60 * 100vw / 1200), 60px);
    width: min(calc(500 * 100vw / 1200), 500px);
    gap: min(calc(36 * 100vw / 1200), 36px);
}
.footer_btn a {
    padding: min(calc(12 * 100vw / 1200), 12px) 0 min(calc(14 * 100vw / 1200), 14px);
    font-size: min(calc(32 * 100vw / 1200), 32px);
    border-radius: calc(44* 100vw / 750);
    transition: .3s all;
}
.footer_btn-arrow {
    top: min(calc(1* 100vw / 1200), 1px);
    left: min(calc(8 * 100vw / 1200), 8px);
    width: min(calc(32 * 100vw / 1200), 32px);
    height: min(calc(32 * 100vw / 1200), 32px);
}
.footer_btn-arrow::after {
    width: min(calc(15 * 100vw / 1200), 15px);
    height: min(calc(18 * 100vw / 1200), 18px);
    clip-path: polygon(0 0, 0 100%, 100% 50%);
}
.footer_btn-20th:hover {
    filter: brightness(1.1);
}
.footer_btn-top:hover{
    opacity: .7;
}

/* bottom
-------------------------------------------------------------------------- */
.bottom {
    padding: min(calc(14 * 100vw / 1200), 14px) 0;
    font-size: min(calc(12 * 100vw / 1200), 12px);
    letter-spacing: .04em;
}
/* bread */
.bread_list {
    margin-bottom: min(calc(4 * 100vw / 1200), 4px);
}
.bread_item:not(:last-child)::after {
    padding: 0 min(calc(8 * 100vw / 1200), 8px);
}
.bread_item a:hover {
    text-decoration: underline;
}

}