/* ==========================================================
   common.css : 헤더, 푸터, 버튼, 서브페이지 공통 레이아웃
   ========================================================== */

/* ---------- 레이아웃 ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 20px;
}
@media (min-width: 992px) { .container { padding: 0 30px; } }

.section { padding: 70px 0; }
@media (min-width: 768px) { .section { padding: 100px 0; } }
@media (min-width: 992px) { .section { padding: 130px 0; } }
.section.bg-gray { background: var(--color-bg-gray); }
.section.bg-point { background: var(--color-point); color: #fff; }

.sec-title { font-size: 26px; margin-bottom: 16px; }
.sec-desc { font-size: 15px; color: var(--color-text-sub); }
@media (min-width: 768px) {
  .sec-title { font-size: 36px; margin-bottom: 20px; }
  .sec-desc { font-size: 17px; }
}
@media (min-width: 992px) { .sec-title { font-size: 44px; } }
.sec-head { margin-bottom: 40px; }
@media (min-width: 768px) { .sec-head { margin-bottom: 60px; } }

/* ---------- 버튼 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  height: 48px; padding: 0 28px; border-radius: 24px;
  font-weight: 700; font-size: 15px; transition: all .25s;
  border: 1px solid transparent; white-space: nowrap;
}
.btn-point { background: var(--color-point); color: #fff; }
.btn-point:hover { background: var(--color-point-dark); }
.btn-white { background: #fff; color: var(--color-point); }
.btn-white:hover { background: #f0f3ff; }
.btn-outline { border-color: var(--color-point); color: var(--color-point); }
.btn-outline:hover { background: var(--color-point); color: #fff; }
.btn-gray { background: #ddd; color: #555; }
.btn-lg { height: 56px; padding: 0 40px; border-radius: 28px; font-size: 16px; }
.btn-sm { height: 38px; padding: 0 18px; font-size: 13px; border-radius: 19px; }
.btn-block { width: 100%; }
.btn .arrow { margin-left: 8px; font-size: 14px; }

/* ---------- 헤더 ---------- */
.header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  height: var(--header-h-m);
  background: transparent;
  transition: background .3s, box-shadow .3s;
}
.header.is-fixed, .header.is-sub, .header.is-open, .header:hover {
  background: #fff; box-shadow: 0 1px 0 rgba(0,0,0,.06);
}
.header .inner {
  position: relative; display: flex; align-items: center; justify-content: space-between;
  height: 100%; max-width: 1400px; margin: 0 auto; padding: 0 20px;
}
.header .logo { display: block; width: 130px; height: 100%; display: flex; align-items: center; }
.header .logo img { width: 100%; }
.header .logo .logo-white { display: none; }
.header.is-main:not(.is-fixed):not(.is-open):not(:hover) .logo .logo-color { display: none; }
.header.is-main:not(.is-fixed):not(.is-open):not(:hover) .logo .logo-white { display: block; }

.gnb { display: none; }
.header .util { display: flex; align-items: center; gap: 10px; }
.btn-login {
  display: inline-flex; align-items: center; gap: 6px; height: 36px; padding: 0 16px;
  border-radius: 18px; border: 1px solid var(--color-point); color: var(--color-point);
  font-size: 13px; font-weight: 700;
}
.btn-login::before {
  content: ""; width: 14px; height: 14px;
  background: url(../images/common/header-icon-login-999.svg) no-repeat center / contain;
}
.header.is-main:not(.is-fixed):not(.is-open):not(:hover) .btn-login { border-color: #fff; color: #fff; }
.header.is-main:not(.is-fixed):not(.is-open):not(:hover) .btn-login::before { background-image: url(../images/common/header-icon-login-fff.svg); }

.btn-menu { position: relative; width: 36px; height: 36px; }
.btn-menu span {
  position: absolute; left: 8px; right: 8px; height: 2px; background: var(--color-text);
  transition: transform .3s, opacity .3s, top .3s;
}
.btn-menu span:nth-child(1) { top: 11px; }
.btn-menu span:nth-child(2) { top: 17px; }
.btn-menu span:nth-child(3) { top: 23px; }
.header.is-main:not(.is-fixed):not(.is-open):not(:hover) .btn-menu span { background: #fff; }
.header.is-open .btn-menu span:nth-child(1) { top: 17px; transform: rotate(45deg); }
.header.is-open .btn-menu span:nth-child(2) { opacity: 0; }
.header.is-open .btn-menu span:nth-child(3) { top: 17px; transform: rotate(-45deg); }

/* 모바일 메뉴 */
.mobile-nav {
  position: fixed; top: var(--header-h-m); left: 0; right: 0; bottom: 0; z-index: 99;
  background: #fff; overflow-y: auto; padding: 10px 20px 40px;
  transform: translateX(100%); transition: transform .35s ease;
}
.header.is-open + .mobile-nav { transform: translateX(0); }
.mobile-nav .m-depth1 > li { border-bottom: 1px solid var(--color-line); }
.mobile-nav .m-depth1 > li > button {
  display: flex; align-items: center; justify-content: space-between; width: 100%;
  padding: 18px 0; font-size: 17px; font-weight: 700; text-align: left;
}
.mobile-nav .m-depth1 > li > button::after {
  content: ""; width: 12px; height: 12px;
  background: url(../images/common/menu_icon_arrow_up.svg) no-repeat center / contain;
  transform: rotate(180deg); transition: transform .3s;
}
.mobile-nav .m-depth1 > li.is-open > button::after { transform: rotate(0); }
.mobile-nav .m-depth2 { display: none; padding: 0 0 14px 12px; }
.mobile-nav .m-depth1 > li.is-open .m-depth2 { display: block; }
.mobile-nav .m-depth2 a { display: block; padding: 10px 0; font-size: 15px; color: var(--color-text-sub); }
.mobile-nav .m-depth2 a.is-active { color: var(--color-point); font-weight: 700; }
.mobile-nav .m-login { margin-top: 24px; }

@media (min-width: 992px) {
  .header { height: var(--header-h); }
  .header .inner { padding: 0 40px; }
  .header .logo { width: 160px; }
  .btn-menu, .mobile-nav { display: none; }
  .btn-login { height: 40px; padding: 0 20px; font-size: 14px; }

  .gnb { display: flex; height: 100%; }
  .gnb > li { position: relative; height: 100%; }
  .gnb > li > a {
    display: flex; align-items: center; height: 100%; padding: 0 28px;
    font-size: 17px; font-weight: 700; color: var(--color-text); transition: color .2s;
  }
  .header.is-main:not(.is-fixed):not(:hover) .gnb > li > a { color: #fff; }
  .gnb > li:hover > a, .gnb > li.is-active > a { color: var(--color-point); }
  .gnb > li > a::after {
    content: ""; position: absolute; left: 28px; right: 28px; bottom: 0; height: 3px;
    background: var(--color-point); transform: scaleX(0); transition: transform .25s;
  }
  .gnb > li:hover > a::after, .gnb > li.is-active > a::after { transform: scaleX(1); }

  .gnb .depth2 {
    position: absolute; top: 100%; left: 50%; transform: translateX(-50%) translateY(10px);
    min-width: 180px; padding: 14px 0; background: #fff; border-radius: 10px;
    box-shadow: var(--shadow); opacity: 0; visibility: hidden; transition: all .25s;
  }
  .gnb > li:hover .depth2 { opacity: 1; visibility: visible; transform: translateX(-50%) translateY(0); }
  .gnb .depth2 a {
    display: block; padding: 9px 24px; font-size: 15px; color: var(--color-text-sub);
    text-align: center; white-space: nowrap; transition: color .2s, background .2s;
  }
  .gnb .depth2 a:hover, .gnb .depth2 a.is-active { color: var(--color-point); background: var(--color-point-light); }
}
@media (min-width: 1200px) { .gnb > li > a { padding: 0 34px; } }

/* ---------- 서브페이지 상단 ---------- */
.sub-top {
  position: relative; margin-top: var(--header-h-m); height: 260px;
  display: flex; align-items: center; color: #fff; overflow: hidden;
  background: var(--color-point) center / cover no-repeat;
}
.sub-top::before { content: ""; position: absolute; inset: 0; background: rgba(20, 40, 120, .45); }
.sub-top .container { position: relative; }
.sub-top .breadcrumb { display: flex; flex-wrap: wrap; gap: 6px; font-size: 13px; opacity: .85; margin-bottom: 12px; }
.sub-top .breadcrumb li + li::before { content: ">"; margin-right: 6px; opacity: .7; }
.sub-top h1 { font-size: 30px; }
.sub-top.top-platform { background-image: url(../images/page/subtop/menu_platform-subtop-bg.jpg); }
.sub-top.top-withus { background-image: url(../images/page/subtop/menu_withus-subtop-bg.jpg); }
.sub-top.top-generalpay { background-image: url(../images/page/subtop/generalpay-subtop-bg.jpg); }
.sub-top.top-personalpay { background-image: url(../images/page/subtop/personalpay-subtop-bg.jpg); }
.sub-top.top-onsitepay { background-image: url(../images/page/subtop/onsitepay-subtop-bg.jpg); }
.sub-top.top-closer { background-image: url(../images/page/subtop/menu_closer-subtop-bg.jpg); }
@media (min-width: 768px) {
  .sub-top { height: 340px; }
  .sub-top h1 { font-size: 40px; }
  .sub-top .breadcrumb { font-size: 14px; }
}
@media (min-width: 992px) {
  .sub-top { margin-top: var(--header-h); height: 420px; }
  .sub-top h1 { font-size: 48px; }
}

/* 서브페이지 인트로 (제목 + 설명) */
.page-intro { text-align: center; }
.page-intro .sec-title { margin-bottom: 14px; }
.page-intro .sec-desc { max-width: 720px; margin: 0 auto; }

/* ---------- 카드/그리드 공통 ---------- */
.grid { display: grid; gap: 20px; }
.grid-2 { grid-template-columns: 1fr; }
.grid-3 { grid-template-columns: 1fr; }
.grid-4 { grid-template-columns: repeat(2, 1fr); }
.grid-5 { grid-template-columns: repeat(2, 1fr); }
@media (min-width: 768px) {
  .grid { gap: 24px; }
  .grid-2 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(3, 1fr); }
  .grid-4 { grid-template-columns: repeat(4, 1fr); }
  .grid-5 { grid-template-columns: repeat(5, 1fr); }
}

.card {
  background: #fff; border-radius: var(--radius); padding: 32px 24px;
  box-shadow: 0 4px 20px rgba(0,0,0,.05); border: 1px solid #f0f0f0;
}

/* 이미지+텍스트 2단 (feature) */
.feature { display: flex; flex-direction: column; gap: 30px; align-items: center; }
.feature + .feature { margin-top: 70px; }
.feature .txt { flex: 1; }
.feature .img { flex: 1; width: 100%; }
.feature .img img { width: 100%; border-radius: var(--radius); }
.feature h3 { font-size: 24px; margin-bottom: 14px; }
.feature p { font-size: 15px; color: var(--color-text-sub); }
@media (min-width: 768px) {
  .feature { flex-direction: row; gap: 60px; }
  .feature.reverse { flex-direction: row-reverse; }
  .feature + .feature { margin-top: 110px; }
  .feature h3 { font-size: 30px; margin-bottom: 20px; }
  .feature p { font-size: 17px; }
}

/* 단계(step) 목록 */
.steps { display: grid; gap: 16px; grid-template-columns: 1fr; counter-reset: step; }
.steps li {
  position: relative; text-align: center; padding: 34px 20px 30px;
  background: #fff; border-radius: var(--radius); border: 1px solid #eee;
}
.steps li .icon { height: 70px; display: flex; align-items: center; justify-content: center; margin-bottom: 18px; }
.steps li .icon img { max-height: 70px; }
.steps li .num {
  display: inline-flex; align-items: center; justify-content: center;
  width: 28px; height: 28px; border-radius: 50%; background: var(--color-point); color: #fff;
  font-size: 13px; font-weight: 700; margin-bottom: 10px;
}
.steps li .tit { font-size: 17px; font-weight: 700; line-height: 1.4; }
@media (min-width: 768px) {
  .steps { gap: 20px; }
  .steps.cols-3 { grid-template-columns: repeat(3, 1fr); }
  .steps.cols-4 { grid-template-columns: repeat(4, 1fr); }
  .steps.cols-5 { grid-template-columns: repeat(5, 1fr); }
  .steps li:not(:last-child)::after {
    content: ""; position: absolute; top: 50%; right: -16px; width: 12px; height: 12px;
    border-top: 2px solid #ccc; border-right: 2px solid #ccc; transform: translateY(-50%) rotate(45deg);
  }
}

/* ---------- 폼 ---------- */
.form { max-width: 820px; margin: 0 auto; }
.form-row { display: flex; flex-direction: column; gap: 8px; padding: 14px 0; border-bottom: 1px solid var(--color-line); }
.form-row > label, .form-row > .lbl { font-weight: 700; font-size: 15px; flex: 0 0 180px; padding-top: 10px; }
.form-row .req::after { content: " *"; color: var(--color-danger); }
.form-row .field { flex: 1; display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.form-row .field > .input, .form-row .field > textarea, .form-row .field > select { flex: 1; min-width: 0; }
.input, textarea, select {
  width: 100%; height: 46px; padding: 0 14px; border: 1px solid #d5d5d5; border-radius: 6px;
  background: #fff; outline: none; transition: border-color .2s;
}
.input:focus, textarea:focus, select:focus { border-color: var(--color-point); }
.input.is-error, textarea.is-error, select.is-error { border-color: var(--color-danger); }
textarea { height: 160px; padding: 12px 14px; resize: vertical; }
select { appearance: none; -webkit-appearance: none;
  background: #fff url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%23555' stroke-width='1.5' fill='none'/%3E%3C/svg%3E") no-repeat right 14px center; padding-right: 36px; }
.form-head { margin: 50px 0 10px; font-size: 20px; }
.form-head:first-child { margin-top: 0; }
.form-head small { display: block; margin-top: 4px; font-family: var(--font-body); font-weight: 400; font-size: 14px; color: var(--color-text-light); }
.radio-group, .check-group { display: flex; flex-wrap: wrap; gap: 8px 22px; }
.radio-group label, .check-group label { display: inline-flex; align-items: center; gap: 6px; cursor: pointer; font-size: 15px; }
.radio-group input, .check-group input { width: 18px; height: 18px; accent-color: var(--color-point); margin: 0; }
.agree-box { margin-top: 30px; padding: 22px 24px; background: var(--color-bg-gray); border-radius: 8px; }
.agree-box .agree-all { padding-bottom: 14px; margin-bottom: 14px; border-bottom: 1px solid #ddd; font-weight: 700; }
.agree-box label { display: flex; align-items: center; gap: 8px; cursor: pointer; font-size: 14px; }
.agree-box label + label { margin-top: 10px; }
.agree-box input { width: 18px; height: 18px; accent-color: var(--color-point); margin: 0; flex: none; }
.agree-box .more { margin-left: auto; font-size: 12px; color: var(--color-text-light); text-decoration: underline; white-space: nowrap; }
.form-actions { display: flex; justify-content: center; gap: 12px; margin-top: 40px; }
.form-msg { font-size: 12px; color: var(--color-danger); width: 100%; display: none; }
.form-row.is-error .form-msg { display: block; }
@media (min-width: 768px) {
  .form-row { flex-direction: row; gap: 20px; padding: 16px 0; }
}

/* ---------- 탭 ---------- */
.tabs { display: flex; flex-wrap: wrap; justify-content: center; gap: 8px; margin-bottom: 40px; }
.tabs button {
  height: 42px; padding: 0 22px; border-radius: 21px; border: 1px solid #ddd;
  font-size: 14px; font-weight: 700; color: var(--color-text-sub); background: #fff; transition: all .2s;
}
.tabs button:hover { border-color: var(--color-point); color: var(--color-point); }
.tabs button.is-active { background: var(--color-point); border-color: var(--color-point); color: #fff; }

/* ---------- 게시판 ---------- */
.board-info { margin-bottom: 16px; font-size: 14px; color: var(--color-text-sub); }
.board-info strong { color: var(--color-point); }
.board-list { border-top: 2px solid var(--color-text); }
.board-list .row {
  display: grid; grid-template-columns: 1fr; gap: 4px; padding: 16px 6px;
  border-bottom: 1px solid var(--color-line); transition: background .2s;
}
.board-list .row.head { display: none; }
.board-list .row:hover { background: var(--color-bg-gray); }
.board-list .row .num { font-size: 13px; color: var(--color-text-light); }
.board-list .row .num .badge {
  display: inline-block; padding: 2px 10px; border-radius: 12px; background: var(--color-point);
  color: #fff; font-size: 12px; font-weight: 700;
}
.board-list .row .title { font-weight: 500; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.board-list .row.notice-top .title { font-weight: 700; }
.board-list .row .meta { font-size: 13px; color: var(--color-text-light); }
.board-list .row .meta span + span::before { content: "|"; margin: 0 8px; color: #ddd; }
.board-list .row .file { display: none; }
@media (min-width: 768px) {
  .board-list .row { grid-template-columns: 90px 1fr 110px 130px 90px; align-items: center; gap: 0; padding: 18px 10px; text-align: center; }
  .board-list .row.head { display: grid; font-weight: 700; background: var(--color-bg-gray); font-size: 14px; }
  .board-list .row .title { text-align: left; padding: 0 16px; }
  .board-list .row .meta { display: contents; }
  .board-list .row .meta span + span::before { content: none; }
  .board-list .row .file { display: block; }
}
.pagination { display: flex; justify-content: center; gap: 6px; margin-top: 40px; }
.pagination button {
  width: 36px; height: 36px; border-radius: 50%; font-size: 14px; color: var(--color-text-sub);
  display: inline-flex; align-items: center; justify-content: center; transition: all .2s;
}
.pagination button:hover { background: var(--color-bg-gray2); }
.pagination button.is-active { background: var(--color-point); color: #fff; font-weight: 700; }
.pagination button:disabled { opacity: .3; cursor: default; }

/* 게시글 상세 */
.board-view .view-head { padding: 24px 10px; border-top: 2px solid var(--color-text); border-bottom: 1px solid var(--color-line); }
.board-view .view-head .cat { display: inline-block; font-size: 13px; color: var(--color-point); font-weight: 700; margin-bottom: 8px; }
.board-view .view-head h2 { font-size: 22px; font-family: var(--font-body); font-weight: 700; margin-bottom: 10px; }
.board-view .view-head .meta { font-size: 13px; color: var(--color-text-light); }
.board-view .view-head .meta span + span::before { content: "|"; margin: 0 8px; color: #ddd; }
.board-view .view-body { padding: 40px 10px; border-bottom: 1px solid var(--color-line); font-size: 15px; line-height: 1.9; white-space: pre-line; }
.board-view .view-foot { display: flex; justify-content: center; margin-top: 30px; }

/* ---------- 아코디언 (FAQ) ---------- */
.accordion { border-top: 2px solid var(--color-text); }
.accordion .item { border-bottom: 1px solid var(--color-line); }
.accordion .q {
  display: flex; align-items: flex-start; gap: 14px; width: 100%; padding: 20px 10px;
  text-align: left; font-size: 16px; font-weight: 500; transition: color .2s;
}
.accordion .q:hover, .accordion .item.is-open .q { color: var(--color-point); }
.accordion .q .mark, .accordion .a .mark {
  flex: none; width: 30px; height: 30px; border-radius: 50%; display: inline-flex; align-items: center;
  justify-content: center; font-family: var(--font-title); font-weight: 800; font-size: 15px;
}
.accordion .q .mark { background: var(--color-point); color: #fff; }
.accordion .a .mark { background: #ddd; color: #555; }
.accordion .q .txt { flex: 1; padding-top: 3px; }
.accordion .q .cat { font-size: 12px; color: var(--color-text-light); padding-top: 6px; }
.accordion .q::after {
  content: ""; width: 10px; height: 10px; margin: 10px 4px 0; border-right: 2px solid #999;
  border-bottom: 2px solid #999; transform: rotate(45deg); transition: transform .3s;
}
.accordion .item.is-open .q::after { transform: rotate(-135deg); }
.accordion .a { display: none; gap: 14px; padding: 4px 10px 28px; background: var(--color-bg-gray); font-size: 15px; color: var(--color-text-sub); line-height: 1.8; }
.accordion .a .txt { flex: 1; padding-top: 3px; white-space: pre-line; }
.accordion .item.is-open .a { display: flex; padding-top: 24px; }

/* ---------- 모달 ---------- */
.modal { position: fixed; inset: 0; z-index: 200; display: none; align-items: center; justify-content: center; padding: 20px; }
.modal.is-open { display: flex; }
.modal .dim { position: absolute; inset: 0; background: rgba(0,0,0,.55); }
.modal .panel {
  position: relative; width: 100%; max-width: 640px; max-height: 85vh; overflow-y: auto;
  background: #fff; border-radius: 14px; padding: 36px 28px; box-shadow: var(--shadow);
}
.modal .panel h3 { font-size: 22px; margin-bottom: 20px; padding-right: 30px; }
.modal .close { position: absolute; top: 18px; right: 18px; width: 32px; height: 32px; font-size: 28px; line-height: 1; color: #888; }
.modal .close:hover { color: var(--color-text); }
.modal .panel .body { font-size: 14px; line-height: 1.8; color: var(--color-text-sub); white-space: pre-line; }
.tag-list { display: flex; flex-wrap: wrap; gap: 8px; }
.tag-list li { padding: 6px 14px; border-radius: 16px; background: var(--color-bg-gray2); font-size: 13px; }

/* ---------- 토스트 ---------- */
.toast {
  position: fixed; left: 50%; bottom: 40px; z-index: 300; transform: translate(-50%, 20px);
  padding: 14px 24px; background: rgba(34,34,34,.92); color: #fff; border-radius: 30px;
  font-size: 14px; opacity: 0; visibility: hidden; transition: all .3s; white-space: nowrap;
}
.toast.is-show { opacity: 1; visibility: visible; transform: translate(-50%, 0); }

/* ---------- CTA 배너 ---------- */
.cta-banner { background: var(--color-point); color: #fff; text-align: center; padding: 70px 0; }
.cta-banner h2 { font-size: 24px; margin-bottom: 14px; }
.cta-banner p { font-size: 15px; opacity: .9; margin-bottom: 28px; }
@media (min-width: 768px) {
  .cta-banner { padding: 100px 0; }
  .cta-banner h2 { font-size: 34px; }
  .cta-banner p { font-size: 17px; }
}

/* ---------- 푸터 ---------- */
.footer { background: #1b1b1b; color: #9a9a9a; padding: 50px 0 40px; font-size: 13px; }
.footer .f-top { display: flex; flex-direction: column; gap: 24px; padding-bottom: 30px; border-bottom: 1px solid #333; }
.footer .f-logo img { width: 140px; }
.footer .f-links { display: flex; flex-wrap: wrap; gap: 16px; }
.footer .f-links a { color: #ddd; font-weight: 500; }
.footer .f-links a:hover { color: #fff; }
.footer .f-links a.strong { color: #fff; font-weight: 700; }
.footer .f-info { padding-top: 26px; }
.footer .f-info dl { display: flex; flex-wrap: wrap; gap: 6px 0; }
.footer .f-info dl div { display: flex; gap: 6px; margin-right: 22px; }
.footer .f-info dt { color: #777; }
.footer .f-info dt::after { content: ":"; margin-left: 2px; }
.footer .f-info dd { margin: 0; color: #bbb; }
.footer .f-info dd a:hover { color: #fff; }
.footer .copyright { margin-top: 20px; color: #666; font-size: 12px; }
@media (min-width: 768px) {
  .footer .f-top { flex-direction: row; align-items: center; justify-content: space-between; }
  .footer { padding: 70px 0 50px; }
}

/* ---------- 스크롤 애니메이션 ---------- */
[data-ani] { opacity: 0; transform: translateY(30px); transition: opacity .7s ease, transform .7s ease; }
[data-ani].is-in { opacity: 1; transform: none; }
[data-ani="fade"] { transform: none; }
@media (prefers-reduced-motion: reduce) { [data-ani] { opacity: 1; transform: none; transition: none; } }

/* 상단 이동 버튼 */
.btn-top {
  position: fixed; right: 20px; bottom: 20px; z-index: 90; width: 46px; height: 46px; border-radius: 50%;
  background: #fff; box-shadow: 0 4px 14px rgba(0,0,0,.15); opacity: 0; visibility: hidden; transition: all .3s;
}
.btn-top::before { content: ""; display: block; width: 14px; height: 14px; margin: 0 auto;
  background: url(../images/common/menu_icon_arrow_up.svg) no-repeat center / contain; }
.btn-top.is-show { opacity: 1; visibility: visible; }