/* =========================================================
   Tokens
   ========================================================= */
:root {
  --c-ink: #000;
  --c-text: #1a1a1a;
  --c-sub: #6b6b6b;
  --c-line: #b5b5b5;
  --c-dark: #3a3735;
  /* KV・画像プレースホルダー */
  --c-bg: #fff;

  /* 大きい見出し：Helvetica → Inter Tight（Google Fonts）
     小さい文字　：Helvetica → Arial（Windows）→ Inter（Android等、Arialが無い環境）

     Adobe Fontsに切り替える場合は以下に差し替え
     （family名は管理画面の「CSSで使用」の表記に合わせる）
     --f-en-display: "Helvetica Neue", Helvetica, "neue-haas-grotesk-display", Arial, sans-serif;
     --f-en: "Helvetica Neue", Helvetica, "neue-haas-grotesk-text", Arial, sans-serif; */
  /* 見出し内の「」など和文記号用に和文フォントも続けて指定 */
  --f-en-display: "Helvetica Neue", Helvetica, "Inter Tight", Arial, "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", "Yu Gothic", sans-serif;
  --f-en: "Helvetica Neue", Helvetica, Arial, "Inter", sans-serif;
  --f-ja: "Helvetica Neue", Helvetica, Arial, "Inter", "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", "Yu Gothic", sans-serif;

  --container: 1100px;
  --gutter: 16px;
  --section-gap: clamp(96px, 14vw, 180px);
  --header-h: 60px;
  --fv-pad-top: calc(var(--header-h) + 32px);
  --fv-pad-bottom: 40px;
}

@media (min-width: 768px) {
  :root {
    --fv-pad-top: 15vh;
    --fv-pad-bottom: 7.5vh;
  }
}

/* =========================================================
   Base
   ========================================================= */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-h);
  -webkit-text-size-adjust: 100%;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}

body {
  margin: 0;
  background: var(--c-bg);
  color: var(--c-text);
  font-family: var(--f-ja);
  font-size: 16px;
  line-height: 1.9;
  font-feature-settings: "palt";
  -webkit-font-smoothing: antialiased;
}

body::after {
  content: "";
  position: fixed;
  inset: -50%;
  z-index: 1000;
  pointer-events: none;
  opacity: .07;
  /* 0.04〜0.1あたりで調整 */
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='200' height='200'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

body.is-menu-open {
  overflow: hidden;
}

h1,
h2,
h3,
h4,
p,
ul,
ol,
dl,
dd {
  margin: 0;
}

ul,
ol {
  padding: 0;
  list-style: none;
}

a {
  color: inherit;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

.container {
  width: 100%;
  max-width: calc(var(--container) + var(--gutter) * 2);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

@media (min-width: 768px) {
  :root {
    --gutter: 40px;
  }
}

.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

.sub {
  display: block;
  font-size: .55em;
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: .02em;
  color: var(--c-sub);
  margin-bottom: .3em;
}

/* =========================================================
   Typography Utilities（テキスト装飾・汎用クラス）
   ========================================================= */

/* --- 強調系 --- */
/* 太字強調 */
.u-bold,
.bold {
  font-weight: 700;
}

/* マーカー風・黒帯反転（白文字＋黒背景） */
.u-highlight {
  display: inline-block;
  padding: .05em .35em;
  background: var(--c-ink);
  color: #fff;
  font-weight: 700;
  line-height: 1.4;
}

/* 繊細な下線強調 */
.u-underline {
  text-decoration: underline;
  text-underline-offset: 4px;
  text-decoration-thickness: 1.5px;
}

/* 圏点・アンダードット（文字の上の「・」） */
.u-emphasis {
  text-emphasis: filled dot;
  -webkit-text-emphasis: filled dot;
  text-emphasis-position: over right;
  -webkit-text-emphasis-position: over right;
}

/* サイズアップ強調（115%） */
.u-large {
  font-size: 1.15em;
  font-weight: 700;
}

/* 薄いグレーテキスト（注釈・補足など） */
.u-muted {
  color: var(--c-sub);
}

/* 控えめな小サイズ文字（約80%） */
.u-small {
  font-size: .8em;
}

/* グレー＋小サイズ（※注記・補足説明の1行など） */
.u-note {
  font-size: .8em;
  color: var(--c-sub);
  line-height: 1.7;
}

/* 細字・ライトウェイト */
.u-light {
  font-weight: 400;
}

/* 取り消し線（終了・変更前表記など） */
.u-del {
  text-decoration: line-through;
  color: var(--c-sub);
}

:focus-visible {
  outline: 2px solid var(--c-ink);
  outline-offset: 3px;
}

/* 画像プレースホルダー（本番は <img> に差し替え） */
.ph {
  background: var(--c-dark);
}

.ph--black {
  background: #000;
}

/* =========================================================
   Compact header（スクロール後に表示）
   ========================================================= */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-inline: var(--gutter);
  background: rgba(255, 255, 255, .94);
  border-bottom: 1px solid #e5e5e5;
  transform: translateY(-100%);
  transition: transform .4s ease;
}

.site-header.is-visible,
body.is-menu-open .site-header {
  transform: none;
}

.site-header__title {
  font-family: var(--f-en);
  font-weight: 700;
  font-size: 15px;
  line-height: 1.2;
  letter-spacing: .02em;
  text-decoration: none;
}

.menu-btn {
  position: relative;
  width: 44px;
  height: 44px;
  margin-right: -10px;
  padding: 0;
  border: 0;
  background: none;
  cursor: pointer;
}

.menu-btn__line {
  position: absolute;
  left: 11px;
  width: 22px;
  height: 1.5px;
  background: var(--c-ink);
  transition: transform .3s ease, top .3s ease;
}

.menu-btn__line:nth-child(1) {
  top: 18px;
}

.menu-btn__line:nth-child(2) {
  top: 25px;
}

.menu-btn[aria-expanded="true"] .menu-btn__line:nth-child(1) {
  top: 21.5px;
  transform: rotate(45deg);
}

.menu-btn[aria-expanded="true"] .menu-btn__line:nth-child(2) {
  top: 21.5px;
  transform: rotate(-45deg);
}

.global-nav {
  position: fixed;
  inset: var(--header-h) 0 0 0;
  z-index: 99;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--c-bg);
}

.global-nav[hidden] {
  display: none;
}

.global-nav__list {
  text-align: center;
}

.global-nav__list a {
  position: relative;
  display: inline-block;
  padding: 10px 20px;
  font-family: var(--f-en-display);
  font-weight: 700;
  font-size: 24px;
  text-decoration: none;
  transition: color .2s ease;
  z-index: 0;
}

.global-nav__list a::before {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--c-ink);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform .2s cubic-bezier(0.2, 0.8, 0.2, 1);
  z-index: -1;
}

.global-nav__list a:hover {
  color: #fff;
  text-decoration: none;
}

.global-nav__list a:hover::before {
  transform: scaleX(1);
}

/* =========================================================
   FV
   ========================================================= */
.fv__head {
  display: flex;
  justify-content: space-between;
  align-items: stretch;
  gap: 40px;
  padding-top: var(--fv-pad-top);
  padding-bottom: var(--fv-pad-bottom);
}

.fv__title {
  font-family: var(--f-en-display);
  font-weight: 700;
  font-size: clamp(26px, 4.4vw, 46px);
  line-height: 1.22;
  letter-spacing: .005em;
}

.fv__line {
  display: block;
}

.fv__line>span {
  display: block;
}

.fv__word {
  display: inline-block;
  white-space: nowrap;
}

.is-fv-pending .fv__title {
  visibility: hidden;
}

.fv__small {
  display: block;
  font-size: .6em;
}

.brackets {
  position: relative;
  display: inline-block;
  padding-inline: .45em .4em;
  font-size: 1.2em;
}

/* 鉤括弧「：細線で描画（行数に合わせて自動伸縮） */
.brackets::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: .38em;
  border-top: 1px solid currentColor;
  border-left: 1px solid currentColor;
  pointer-events: none;
}

/* 鉤括弧」：細線で描画（行数に合わせて自動伸縮） */
.brackets::after {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  right: 0;
  width: .38em;
  border-bottom: 1px solid currentColor;
  border-right: 1px solid currentColor;
  pointer-events: none;
}

@media (min-width: 768px) {
  .fv__small {
    display: inline;
  }
}

.fv__nav {
  display: none;
}

@media (min-width: 768px) {
  .fv__head {
    padding-top: var(--fv-pad-top);
    padding-bottom: var(--fv-pad-bottom);
  }

  .fv__nav {
    display: block;
    flex-shrink: 0;
    padding: 0 0 12px 28px;
    margin-top: calc(-1 * var(--fv-pad-top));
    /* 縦線を画面上端から伸ばす */
    padding-top: var(--fv-pad-top);
    border-left: 1px solid var(--c-ink);
  }

  .fv__nav a {
    position: relative;
    display: inline-block;
    padding: 2px 6px;
    margin-inline: -6px;
    font-family: var(--f-en);
    font-weight: 700;
    font-size: 15px;
    line-height: 1.6;
    text-decoration: none;
    transition: color .2s ease;
    z-index: 0;
  }

  .fv__nav a::before {
    content: "";
    position: absolute;
    inset: 0;
    background: var(--c-ink);
    transform: scaleX(0);
    transform-origin: left center;
    transition: transform .2s cubic-bezier(0.2, 0.8, 0.2, 1);
    z-index: -1;
  }

  .fv__nav a:hover {
    color: #fff;
    text-decoration: none;
  }

  .fv__nav a:hover::before {
    transform: scaleX(1);
  }
}

/* KV */
.kv {
  --kv-shade: rgba(0, 0, 0, .25);
  /* ロゴの可読性確保。アー写に合わせて調整、不要なら 0 */
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  /* SP：縦積み（leftが上、rightが下） */
  background: var(--c-dark);
  overflow: hidden;
}

@media (min-width: 768px) {
  .kv {
    grid-template-columns: 1fr 1fr;
    aspect-ratio: 1440 / 600;
    /* PC：デザインに合わせて調整 */
  }
}

.kv__item {
  position: relative;
  display: grid;
  place-items: center;
  aspect-ratio: 375 / 260;
  /* SP：1枚あたりの比率 */
  overflow: hidden;
}

@media (min-width: 768px) {
  .kv__item {
    aspect-ratio: auto;
  }
}

.kv__item::after {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--kv-shade);
  pointer-events: none;
}

.kv__photo {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 30%;
  /* 顔位置に合わせて個別に調整 */
}

.kv__logo {
  position: absolute;
  top: 72%;
  left: 50%;
  translate: -50% -50%;
  z-index: 1;
  width: auto;
  height: 40%;
  max-width: 80%;
  object-fit: contain;
}

.kv__cross {
  position: absolute;
  z-index: 2;
  top: 50%;
  /* SP：写真と写真の境目（中央） */
  left: 50%;
  width: clamp(48px, 11vw, 140px);
  height: auto;
  aspect-ratio: 1;
  translate: -50% -50%;
  overflow: visible;
}

@media (min-width: 768px) {
  .kv__cross {
    top: 72%;
    /* PC：ロゴの高さに合わせる */
  }
}

.kv__cross line {
  stroke: #fff;
  stroke-width: 1.2;
  vector-effect: non-scaling-stroke;
  fill: none;
}

/* =========================================================
   Section
   ========================================================= */
.section {
  padding-top: var(--section-gap);
}

.section:last-of-type {
  padding-bottom: var(--section-gap);
}

.section-head {
  margin-bottom: clamp(40px, 6vw, 72px);
}

.section-head__label {
  font-family: var(--f-en);
  font-size: 10px;
  line-height: 1;
  letter-spacing: .04em;
  color: var(--c-sub);
}

.section-head__title {
  margin-top: 14px;
  font-family: var(--f-en-display);
  font-weight: 400;
  font-size: clamp(36px, 5vw, 52px);
  line-height: 1.1;
  letter-spacing: .01em;
}

/* =========================================================
   Project
   ========================================================= */
.project__lead {
  margin-bottom: clamp(40px, 6vw, 64px);
  font-weight: 700;
  font-size: clamp(16px, 1.6vw, 18px);
  line-height: 2;
}

.artists {
  display: grid;
  gap: 72px;
}

@media (min-width: 768px) {
  .artists {
    grid-template-columns: 1fr 1fr;
    gap: 56px;
    align-items: start;
  }
}

/* KVと同じアー写のトリミング違い。別ファイルで書き出す想定
   （同じファイルを使う場合は object-position で位置を調整） */
.artist__img {
  width: 100%;
  aspect-ratio: 1.43;
  object-fit: cover;
  object-position: center 25%;
  background: var(--c-dark);
}

.artist__name {
  margin: 28px 0 20px;
  font-family: var(--f-en-display);
  font-weight: 700;
  font-size: clamp(28px, 3.2vw, 36px);
  line-height: 1.2;
}

.artist__body p+p {
  margin-top: 1em;
}

.media__title {
  margin: 36px 0 10px;
  font-family: var(--f-en);
  font-weight: 700;
  font-size: 13px;
  letter-spacing: .04em;
}

.media {
  font-size: 13px;
  line-height: 1.9;
  overflow-wrap: anywhere;
  /* 長いURLの折り返し */
}

.media li {
  padding-block: 2px;
}

.media a {
  position: relative;
  display: inline-block;
  padding: 1px 4px;
  margin-inline: -4px;
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color .2s ease;
  z-index: 0;
}

.media a::before {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--c-ink);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform .2s cubic-bezier(0.2, 0.8, 0.2, 1);
  z-index: -1;
}

.media a:hover {
  color: #fff;
  text-decoration: none;
}

.media a:hover::before {
  transform: scaleX(1);
}

/* =========================================================
   Release
   ========================================================= */
.release {
  display: grid;
  gap: 40px;
}

@media (min-width: 900px) {
  .release {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 40px;
    align-items: start;
  }
}

.release__jacket {
  aspect-ratio: 1;
}

.release__type {
  font-family: var(--f-en);
  font-weight: 700;
  font-size: 14px;
}

.release__title {
  margin-top: 16px;
  font-family: var(--f-en-display);
  font-weight: 700;
  font-size: clamp(22px, 2.4vw, 28px);
  line-height: 1.55;
}

.release__edition {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 16px;
  margin-top: 28px;
  font-size: 14px;
}

.badge {
  display: inline-block;
  padding: 2px 12px;
  border: 1px solid var(--c-ink);
  font-weight: 700;
  font-size: 12px;
  line-height: 1.6;
}

.release__code small {
  font-size: .8em;
}

.btn {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 56px;
  font-family: var(--f-en);
  font-weight: 700;
  font-size: 14px;
  letter-spacing: .04em;
  text-decoration: none;
  transition: background-color .25s, color .25s;
}

.btn--primary {
  margin-top: 24px;
  background: var(--c-ink);
  color: #fff;
  border: 1px solid var(--c-ink);
}

.btn--primary:hover {
  background: #fff;
  color: var(--c-ink);
}

.btn--outline {
  min-width: 200px;
  min-height: 50px;
  padding-inline: 32px;
  border: 1px solid var(--c-ink);
}

.btn--outline:hover {
  background: var(--c-ink);
  color: #fff;
}

.release__subtitle {
  margin: 40px 0 12px;
  font-family: var(--f-en);
  font-weight: 700;
  font-size: 14px;
}

.tracklist {
  counter-reset: track;
  font-size: 15px;
  line-height: 2.2;
  margin: 40px 0;
}

.tracklist li {
  counter-increment: track;
}

.tracklist li::before {
  content: counter(track, decimal-leading-zero) ". ";
  font-family: var(--f-en);
}

.new {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: .1em .5em;
  margin-left: .8em;
  background: var(--c-ink);
  color: #fff;
  font-size: 11px;
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: .04em;
  vertical-align: middle;
}

.bonus {
  margin-top: 40px;
  border: 1px solid var(--c-line);
}

.bonus__title {
  padding: 8px 16px;
  border-bottom: 1px solid var(--c-line);
  font-weight: 400;
  font-size: 14px;
  text-align: center;
  letter-spacing: .1em;
}

.bonus__list {
  counter-reset: bonus;
  padding: 24px 24px 28px;
  font-size: 14px;
  line-height: 1.8;
}

.bonus__list li {
  counter-increment: bonus;
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: baseline;
  gap: .6em;
}

.bonus__list li+li {
  margin-top: 14px;
}

.bonus__list li::before {
  content: counter(bonus);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.55em;
  height: 1.55em;
  border-radius: 50%;
  background: var(--c-ink);
  color: #fff;
  font-family: var(--f-en);
  font-size: 11px;
  font-weight: 700;
  line-height: 1;
  vertical-align: middle;
  transform: translateY(-.05em);
}

/* =========================================================
   Live
   ========================================================= */
.live__title {
  margin-bottom: clamp(40px, 6vw, 64px);
  font-family: var(--f-en-display);
  font-weight: 700;
  font-size: clamp(22px, 3vw, 34px);
  line-height: 1.35;
}

.live-list {
  display: grid;
  gap: 32px;
}

@media (min-width: 768px) {
  .live-list {
    grid-template-columns: 1fr 1fr;
    gap: 48px 40px;
  }
}

.moreinfo {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 96px;
  padding: 16px 20px;
  border: 1px solid var(--c-line);
  font-family: var(--f-en);
  font-size: 14px;
  letter-spacing: .06em;
  color: var(--c-sub);
  text-align: center;
}

@media (min-width: 1000px) {
  .moreinfo {
    min-height: 112px;
    font-size: 15px;
  }
}

.live-card {
  display: grid;
  grid-template-columns: 96px minmax(0, 1fr);
  gap: 20px;
  align-items: stretch;
}

@media (min-width: 1000px) {
  .live-card {
    grid-template-columns: 112px minmax(0, 1fr);
  }
}

.live-card__place {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
  min-height: 96px;
  padding: 14px 8px;
  background: var(--c-ink);
  color: #fff;
  font-family: var(--f-en);
  font-weight: 700;
  font-size: 14px;
  line-height: 1.25;
  text-align: center;
}

@media (min-width: 1000px) {
  .live-card__place {
    min-height: 112px;
    font-size: 16px;
  }
}

.live-card__body {
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.live-card__date {
  font-family: var(--f-en);
  font-weight: 700;
  font-size: 18px;
  line-height: 1.3;
}

.live-card__date small {
  font-size: .7em;
}

.live-card__venue {
  margin-top: 4px;
  font-weight: 700;
  font-size: 13px;
  line-height: 1.6;
}

.live-card__time {
  font-size: 13px;
  line-height: 1.6;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--c-line);
}

.live-card__links {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.7;
}

.live-card__links div {
  display: flex;
  gap: .5em;
}

.live-card__links dt {
  font-family: var(--f-en);
  font-weight: 700;
}

.live-card__links dt::before {
  content: "[";
}

.live-card__links dt::after {
  content: "]";
}

/* =========================================================
   News
   ========================================================= */
.news-list {
  border-top: 1px solid var(--c-line);
}

.news-list>li {
  border-bottom: 1px solid var(--c-line);
}

.news-item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 8px 20px;
  align-items: center;
  padding: 24px 4px;
  text-decoration: none;
  transition: opacity .25s;
}

a.news-item:hover {
  opacity: .6;
}

.news-item__date {
  font-family: var(--f-en);
  font-size: 14px;
}

.news-item__cat {
  justify-self: start;
  min-width: 72px;
  padding: 0 8px;
  border: 1px solid var(--c-ink);
  font-family: var(--f-en);
  font-size: 11px;
  line-height: 1.7;
  text-align: center;
}

.news-item__title {
  grid-column: 1 / -1;
  font-size: 15px;
  line-height: 1.7;
}

@media (min-width: 768px) {
  .news-item {
    grid-template-columns: 110px 96px 1fr;
    gap: 24px;
    padding: 28px 8px;
  }

  .news-item__title {
    grid-column: auto;
  }
}

.news-list__loading,
.news-list__empty {
  padding: 28px 8px;
  font-size: 14px;
  color: var(--c-sub);
}

.news__more {
  display: flex;
  justify-content: center;
  margin-top: 48px;
}

/* =========================================================
   Footer
   ========================================================= */
.site-footer {
  padding: 56px var(--gutter) 40px;
  border-top: 1px solid #d9d9d9;
  text-align: center;
}

.share__title {
  font-family: var(--f-en);
  font-weight: 700;
  font-size: 14px;
  letter-spacing: .04em;
}

.share__list {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-top: 16px;
}

.share__btn {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 72px;
  height: 44px;
  padding-inline: 16px;
  border: 1px solid var(--c-ink);
  font-family: var(--f-en);
  font-weight: 700;
  font-size: 14px;
  text-decoration: none;
  transition: background-color .25s, color .25s;
}

.share__btn:hover {
  background: var(--c-ink);
  color: #fff;
}

.copyright {
  margin-top: 64px;
  font-size: 11px;
  color: var(--c-sub);
}

/* =========================================================
   Back to top
   ========================================================= */
.back-to-top {
  position: fixed;
  right: 20px;
  bottom: 24px;
  z-index: 90;
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  aspect-ratio: 1;
  border: 0;
  background: transparent;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translateY(12px);
  transition: opacity .3s ease, visibility .3s ease, transform .3s ease;
}

@media (min-width: 768px) {
  .back-to-top {
    right: 32px;
    bottom: 32px;
    width: 48px;
    height: 48px;
  }
}

.back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateY(0);
}

.back-to-top svg {
  width: 100%;
  height: 100%;
  display: block;
}

.back-to-top rect {
  fill: #fff;
  transition: fill .25s ease;
}

.back-to-top line {
  fill: none;
  stroke: #3d3838;
  stroke-miterlimit: 10;
  stroke-width: 1.5px;
  vector-effect: non-scaling-stroke;
  transition: stroke .25s ease;
}

.back-to-top:hover rect {
  fill: var(--c-ink);
}

.back-to-top:hover line {
  stroke: #fff;
}