@charset "UTF-8";

/* ===========================================
   Format CSS
   意図的なスタイル（タイポグラフィ・レイアウト等）
   =========================================== */


/* ============================
   Base
   ============================ */
body {
  background-color: #071327;
  color: #ffffff;
  font-family: "Noto Serif", "Noto Serif JP", serif;
  font-weight: 400;
}


/* ============================
   Hero Section
   ============================ */
.hero {
  position: relative;
  width: 100%;
  min-height: 100vh;
  min-height: 100svh;
  display: flex;
  justify-content: center;
  align-items: center;
  text-align: center;
  overflow: hidden;
}

.hero {
  background-color: #071327;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: url("images/hero.jpg");
  background-position: center;
  background-size: cover;
  background-repeat: no-repeat;
  opacity: 0.55;
  -webkit-mask-image: linear-gradient(
    to bottom,
    #000 0%,
    #000 70%,
    transparent 100%
  );
  mask-image: linear-gradient(
    to bottom,
    #000 0%,
    #000 70%,
    transparent 100%
  );
  z-index: 0;
  transform-origin: center;
}

body:not(.is-locked) .hero::before {
  animation: heroKenBurns 24s ease-in-out infinite alternate;
}

@keyframes heroKenBurns {
  0% {
    transform: scale(1) translate(0, 0);
  }
  100% {
    transform: scale(1.12) translate(-1.5%, 1%);
  }
}

.hero__inner {
  position: relative;
  z-index: 1;
  width: 100%;
  padding: 2rem 1rem;
}

.hero__caption,
.hero__title,
.hero__subtitle,
.hero .player,
.hero__scroll {
  opacity: 0;
  transform: translateY(20px);
  filter: blur(4px);
}

body:not(.is-locked) .hero__caption,
body:not(.is-locked) .hero__title,
body:not(.is-locked) .hero__subtitle,
body:not(.is-locked) .hero .player,
body:not(.is-locked) .hero__scroll {
  animation: heroFadeUp 1.2s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

body:not(.is-locked) .hero__caption  { animation-delay: 0.2s; }
body:not(.is-locked) .hero__title    { animation-delay: 0.5s; }
body:not(.is-locked) .hero__subtitle { animation-delay: 0.9s; }
body:not(.is-locked) .hero .player   { animation-delay: 1.3s; }
body:not(.is-locked) .hero__scroll   { animation-delay: 1.8s; }

@keyframes heroFadeUp {
  to {
    opacity: 1;
    transform: translateY(0);
    filter: blur(0);
  }
}

@media (prefers-reduced-motion: reduce) {
  .hero::before {
    animation: none;
  }
  .hero__caption,
  .hero__title,
  .hero__subtitle,
  .hero .player,
  .hero__scroll {
    opacity: 1;
    transform: none;
    filter: none;
    animation: none;
  }
}

.hero__caption {
  font-size: 0.95rem;
  line-height: 1.9;
  margin-bottom: 2rem;
}

.hero__title {
  font-size: clamp(3.5rem, 12vw, 8rem);
  font-weight: 500;
  line-height: 1.2;
  letter-spacing: 0.1em;
  margin-bottom: 1.5rem;
}

.hero__subtitle {
  font-size: clamp(1rem, 3vw, 1.5rem);
  font-weight: 400;
  line-height: 1.6;
  letter-spacing: 0.15em;
  margin-bottom: 6rem;
}


/* ============================
   Audio Player
   ============================ */
.player {
  width: min(100%, 600px);
  margin: 3rem auto 0;
  padding: 0 1rem;
}

.player__notice {
  font-size: 1.0625rem;
  letter-spacing: 0.1em;
  margin-bottom: 1.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
}

.player__notice::before,
.player__notice::after {
  content: "";
  display: block;
  width: 80px;
  height: 1px;
  background-color: #ffffff;
}

.player__notice-br {
  display: none;
}

@media (max-width: 640px) {
  .player__notice-br {
    display: inline;
  }

  .player__notice::before,
  .player__notice::after {
    width: 40px;
  }
}

.player__card {
  display: flex;
  align-items: center;
  gap: 2rem;
  padding: 1.75rem 2rem;
  background-color: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 1rem;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.player__button {
  flex-shrink: 0;
  width: 4.5rem;
  height: 4.5rem;
  border-radius: 50%;
  background-color: #ffffff;
  display: flex;
  justify-content: center;
  align-items: center;
  box-shadow:
    0 0 0 0 rgba(255, 255, 255, 0.5),
    0 0 24px rgba(255, 255, 255, 0.45),
    0 0 56px rgba(255, 255, 255, 0.25),
    0 0 96px rgba(255, 255, 255, 0.12);
  animation: playerGlow 2.6s ease-in-out infinite;
  transition: transform 0.2s ease, background-color 0.2s ease;
}

.player__button:hover {
  transform: scale(1.05);
}

@keyframes playerGlow {
  0%, 100% {
    box-shadow:
      0 0 0 0 rgba(255, 255, 255, 0.45),
      0 0 24px rgba(255, 255, 255, 0.4),
      0 0 56px rgba(255, 255, 255, 0.22),
      0 0 96px rgba(255, 255, 255, 0.1);
  }
  50% {
    box-shadow:
      0 0 0 6px rgba(255, 255, 255, 0.08),
      0 0 36px rgba(255, 255, 255, 0.6),
      0 0 80px rgba(255, 255, 255, 0.32),
      0 0 130px rgba(255, 255, 255, 0.16);
  }
}

.player.is-playing .player__button {
  animation: none;
  box-shadow:
    0 0 18px rgba(255, 255, 255, 0.25),
    0 0 40px rgba(255, 255, 255, 0.12);
}

@media (prefers-reduced-motion: reduce) {
  .player__button {
    animation: none;
  }
}

.player__icon {
  width: 1.75rem;
  height: 1.75rem;
  fill: #071327;
}

.player__icon-pause {
  display: none;
}

.player.is-playing .player__icon-play {
  display: none;
}

.player.is-playing .player__icon-pause {
  display: block;
}

.player__body {
  flex: 1;
  min-width: 0;
  text-align: left;
}

.player__title {
  font-size: 1.125rem;
  font-weight: 600;
  letter-spacing: 0.05em;
}

.player__vocal {
  font-size: 0.8125rem;
  letter-spacing: 0.08em;
  margin-top: 0.25rem;
  opacity: 0.85;
}

.player__progress {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  margin-top: 0.875rem;
}

.player__time {
  font-size: 0.75rem;
  font-variant-numeric: tabular-nums;
  opacity: 0.85;
  flex-shrink: 0;
}

.player__seek {
  flex: 1;
  position: relative;
  height: 3px;
  background-color: rgba(255, 255, 255, 0.25);
  border-radius: 999px;
  cursor: pointer;
}

.player__seek-fill {
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  width: 0%;
  background-color: #ffffff;
  border-radius: 999px;
}

.player__seek-thumb {
  position: absolute;
  top: 50%;
  left: 0%;
  width: 0.75rem;
  height: 0.75rem;
  border-radius: 50%;
  background-color: #ffffff;
  transform: translate(-50%, -50%);
  pointer-events: none;
}

.player__credit {
  font-size: 0.9375rem;
  letter-spacing: 0.08em;
  margin-top: 1rem;
  opacity: 0.9;
}

.player__credit-br {
  display: none;
}

@media (max-width: 640px) {
  .player__credit-sep {
    display: none;
  }

  .player__credit-br {
    display: inline;
  }
}

.player__audio {
  display: none;
}


/* ============================
   Scroll Indicator
   ============================ */
.hero__scroll {
  position: absolute;
  right: 1.5rem;
  bottom: 1.5rem;
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  color: #ffffff;
  font-size: 0.75rem;
  letter-spacing: 0.25em;
  text-decoration: none;
  writing-mode: vertical-rl;
}

.hero__scroll-text {
  text-orientation: mixed;
}

.hero__scroll-line {
  position: relative;
  display: block;
  width: 1px;
  height: 4rem;
  background-color: rgba(255, 255, 255, 0.25);
  overflow: hidden;
}

.hero__scroll-line::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 50%;
  background-color: #ffffff;
  animation: scrollLine 2s ease-in-out infinite;
}

@keyframes scrollLine {
  0% {
    transform: translateY(-100%);
  }
  100% {
    transform: translateY(200%);
  }
}


/* ============================
   Lyrics Section
   ============================ */
.lyrics {
  position: relative;
  padding: 8rem 1.5rem;
  background-color: #071327;
  background-image:
    linear-gradient(rgba(7, 19, 39, 0.8), rgba(7, 19, 39, 0.8)),
    url("images/bg.jpg");
  background-position: center;
  background-size: cover;
  background-repeat: no-repeat;
  background-attachment: fixed;
}

.lyrics__inner {
  position: relative;
  width: min(100%, 640px);
  margin: 0 auto;
  text-align: center;
}

.lyrics__heading {
  font-size: 0.875rem;
  letter-spacing: 0.4em;
  margin-bottom: 1.25rem;
  opacity: 0.7;
}

.lyrics__title {
  font-size: 1rem;
  font-weight: inherit;
  letter-spacing: 0.08em;
  line-height: 2.4;
  margin-bottom: 2.5rem;
}

.lyrics__body {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.lyrics__verse {
  font-size: 1rem;
  line-height: 2.4;
  letter-spacing: 0.08em;
  margin-bottom: 2.5rem;
}

.lyrics__verse:last-child {
  margin-bottom: 0;
}

.lyrics__toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.625rem;
  margin: 1.5rem 0 3rem;
  padding: 0.75rem 1.75rem;
  color: #ffffff;
  font-family: inherit;
  font-size: 0.9375rem;
  letter-spacing: 0.15em;
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.4);
  border-radius: 999px;
  cursor: pointer;
  transition: background-color 0.2s ease, border-color 0.2s ease;
  order: 2;
}

.lyrics.is-open .lyrics__toggle {
  order: 5;
  margin: 3rem 0 0;
}

.lyrics__toggle:hover {
  background-color: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.7);
}

.lyrics__toggle-icon {
  display: inline-block;
  font-size: 1.125rem;
  line-height: 1;
  transition: transform 0.3s ease;
}

.lyrics.is-open .lyrics__toggle-icon {
  transform: rotate(45deg);
}

.lyrics__more {
  display: grid;
  grid-template-rows: 0fr;
  width: 100%;
  transition: grid-template-rows 0.5s ease;
  order: 3;
}

.lyrics__more-inner {
  overflow: hidden;
  min-height: 0;
}

.lyrics.is-open .lyrics__more {
  grid-template-rows: 1fr;
}

.lyrics__final {
  font-size: 1rem;
  letter-spacing: 0.08em;
  line-height: 2.4;
  margin-top: 3rem;
}


/* ============================
   Book Section
   ============================ */
.book {
  padding: 8rem 1.5rem 3rem;
  background: linear-gradient(180deg, #061326 0%, #000000 100%);
}

.book__inner {
  width: min(100%, 960px);
  margin: 0 auto;
  text-align: center;
}

.book__heading {
  font-size: 0.875rem;
  letter-spacing: 0.4em;
  margin-bottom: 1.25rem;
  opacity: 0.7;
}

.book__section-title {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 500;
  letter-spacing: 0.15em;
  margin-bottom: 4rem;
}

.book__content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3.5rem;
  align-items: center;
  text-align: left;
}

.book__image-wrap {
  display: flex;
  justify-content: center;
}

.book__image {
  width: 100%;
  max-width: 320px;
  height: auto;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
}

.book__info {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 1rem;
}

.book__title {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 500;
  letter-spacing: 0.1em;
  line-height: 1.5;
}

.book__meta {
  font-size: 0.95rem;
  letter-spacing: 0.08em;
  opacity: 0.85;
}

.book__link {
  display: inline-flex;
  align-items: center;
  margin-top: 1rem;
  padding: 0.85rem 2rem;
  color: #ffffff;
  font-size: 0.9375rem;
  letter-spacing: 0.15em;
  border: 1px solid rgba(255, 255, 255, 0.5);
  border-radius: 999px;
  transition: background-color 0.2s ease, border-color 0.2s ease;
}

.book__link:hover {
  background-color: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.8);
}

@media (max-width: 640px) {
  .book__content {
    grid-template-columns: 1fr;
    gap: 2rem;
    text-align: center;
  }

  .book__info {
    align-items: center;
    text-align: center;
  }
}


/* ============================
   Author Section
   ============================ */
.author {
  padding: 3rem 1.5rem 8rem;
  background: linear-gradient(180deg, #000000 0%, #061326 100%);
}

.author__inner {
  width: min(100%, 960px);
  margin: 0 auto;
  text-align: center;
}

.author__heading {
  font-size: 0.875rem;
  letter-spacing: 0.4em;
  margin-bottom: 1.25rem;
  opacity: 0.7;
}

.author__section-title {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 500;
  letter-spacing: 0.15em;
  margin-bottom: 4rem;
}

.author__content {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 3.5rem;
  align-items: start;
  text-align: left;
}

.author__info {
  order: 1;
}

.author__image-wrap {
  order: 2;
  display: flex;
  justify-content: center;
}

.author__image {
  width: 100%;
  max-width: 320px;
  height: auto;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
}

.author__info {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.author__name {
  font-size: clamp(1.25rem, 2.5vw, 1.625rem);
  font-weight: 500;
  letter-spacing: 0.1em;
  margin-bottom: 0.5rem;
}

.author__bio {
  font-size: 0.9375rem;
  line-height: 2;
  letter-spacing: 0.04em;
  opacity: 0.9;
}

@media (max-width: 640px) {
  .author__content {
    grid-template-columns: 1fr;
    gap: 2rem;
    text-align: left;
  }

  .author__image-wrap {
    margin-bottom: 1rem;
  }

  .author__name {
    text-align: center;
  }
}


/* ============================
   Footer / Share
   ============================ */
.footer {
  padding: 6rem 1.5rem 3rem;
  text-align: center;
  background: linear-gradient(180deg, #061326 0%, #000000 100%);
}

.footer__inner {
  width: min(100%, 720px);
  margin: 0 auto;
}

.share__label {
  font-size: 0.8125rem;
  letter-spacing: 0.4em;
  margin-bottom: 1.5rem;
  opacity: 0.7;
}

.share__btns {
  display: flex;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 4rem;
}

.share__fb {
  display: contents;
}

.share__btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 3rem;
  height: 3rem;
  color: #ffffff;
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.4);
  border-radius: 50%;
  transition: background-color 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
  cursor: pointer;
}

.share__btn:hover {
  background-color: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.8);
  transform: translateY(-2px);
}

.share__btn svg {
  width: 1.125rem;
  height: 1.125rem;
}

.share__copy-feedback {
  position: absolute;
  top: -1.75rem;
  left: 50%;
  transform: translateX(-50%);
  font-size: 0.75rem;
  white-space: nowrap;
  opacity: 0;
  transition: opacity 0.2s ease;
  pointer-events: none;
}

.share__btn.is-copied .share__copy-feedback {
  opacity: 1;
}

.footer__legal {
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  line-height: 1.9;
  opacity: 0.7;
}

.footer__notice {
  margin-top: 0.25rem;
}

.footer__link {
  text-decoration: underline;
  text-underline-offset: 0.2em;
  transition: opacity 0.2s ease;
}

.footer__link:hover {
  text-decoration: none;
  opacity: 0.8;
}