/* ============================================================
   yurislave(百合奴隷) — Personal Website / style.css
   コンセプト:「シンプルなWebサイトが、静かな宇宙空間の中に存在している」
   ------------------------------------------------------------
   目次
   1. デザイントークン
   2. リセット & ベーススタイル
   3. 背景(縦長写真をスクロールで流す + フォールバック)
   4. 宇宙の装飾(星の瞬き / 星雲 / 流星)
   5. スキップリンク
   6. ヘッダー & グローバルナビ
   7. Hero(ファーストビュー)
   8. 汎用パーツ(コンテナ / セクション見出し / ふわっと表示)
   9. Profile
   10. Music
   11. Works
   12. Blog
   13. Links
   14. フッター
   15. クリックエフェクト
   16. レスポンシブ調整
   17. アニメーション抑制(prefers-reduced-motion)
   ============================================================ */


/* ------------------------------------------------------------
   1. デザイントークン
------------------------------------------------------------ */
:root {
  /* カラー(使用色数は最小限) */
  --c-bg: #05070f;                        /* 一番暗い背景 */
  --c-text: #e9edf6;                      /* メイン文字:白〜ごく薄い青 */
  --c-text-sub: #949db1;                  /* サブ文字:グレー〜淡い青 */
  --c-line: rgba(255, 255, 255, 0.13);    /* 線:薄い半透明の白 */
  --c-line-strong: rgba(255, 255, 255, 0.28);
  --c-accent: #8ea6f2;                    /* アクセント:淡い青〜青紫 */
  --c-panel: rgba(10, 15, 28, 0.50);      /* カードの下地 */
  --c-hover: rgba(255, 255, 255, 0.04);   /* ホバー時のごく薄い明るさ */
  --c-header: rgba(6, 10, 20, 0.72);      /* ヘッダー:半透明の濃紺 */

  /* その他 */
  --header-h: 60px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}


/* ------------------------------------------------------------
   2. リセット & ベーススタイル
------------------------------------------------------------ */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 16px);
}

body {
  font-family: "Helvetica Neue", Arial,
    "Hiragino Kaku Gothic ProN", "Hiragino Sans", Meiryo, sans-serif;
  font-size: 16px;
  line-height: 1.85;
  letter-spacing: 0.02em;
  color: var(--c-text);
  background-color: var(--c-bg);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
  position: relative;   /* クリックエフェクト(15.)を収めるため */
  overflow: hidden;
}

button {
  position: relative;
  overflow: hidden;
  font-family: inherit;
}

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

ul {
  list-style: none;
}

a:focus-visible,
button:focus-visible {
  outline: 1px solid var(--c-accent);
  outline-offset: 3px;
}

::selection {
  background: rgba(142, 166, 242, 0.28);
}


/* ------------------------------------------------------------
   3. 背景(縦長の宇宙写真をスクロールで下へ流す)
   ・.bg          固定表示の土台
   ・.bg__photo   画像本体。JSが幅/高さ/translateYを計算して設定する
                  (画像の上端から開始 → ページ最下部で下端に到達)
   ・.bg::before  画像がないとき・読み込み中のフォールバック(淡い星雲)
------------------------------------------------------------ */
.bg {
  position: fixed;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  background-color: var(--c-bg);
}

/* フォールバック:控えめな星雲のグラデーション */
.bg::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(60% 50% at 72% 18%, rgba(64, 84, 160, 0.16), transparent 70%),
    radial-gradient(52% 42% at 18% 82%, rgba(96, 78, 158, 0.10), transparent 70%);
}

/* 宇宙画像。初期状態はJS無効でも破綻しないよう cover で上寄りに表示。
   JSが有効なら自然サイズから精密にサイズ計算される */
.bg__photo {
  position: absolute;
  left: 50%;
  top: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center top;
  transform: translate(-50%, 0);
  will-change: transform; /* 流れる動き専用。transformだけ動かす */
}

/* 読みやすさ用のオーバーレイ(上と下をやや濃く) */
.bg__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    180deg,
    rgba(4, 7, 15, 0.58),
    rgba(4, 7, 15, 0.36) 45%,
    rgba(4, 7, 15, 0.68)
  );
}


/* ------------------------------------------------------------
   4. 宇宙の装飾(すべてごく控えめ)
   ・.bg__fx         装飾レイヤーの土台(クリック不可)
   ・.bg__glow       星雲の淡い光。20秒以上かけてほんの少し呼吸する
   ・.bg__stars .star 小さな星。JSが生成。opacityだけでゆっくり瞬く
   ・.shooting-star  流星。JSが十数秒〜数十秒に1回だけ発光させる
------------------------------------------------------------ */
.bg__fx {
  position: absolute;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
}

/* --- 星雲の呼吸 --- */
.bg__glow {
  position: absolute;
  inset: -10%;
  background:
    radial-gradient(42% 32% at 70% 22%, rgba(96, 118, 190, 0.16), transparent 70%),
    radial-gradient(38% 30% at 24% 74%, rgba(126, 102, 196, 0.11), transparent 72%);
  animation: glow-breathe 24s ease-in-out infinite alternate;
}

@keyframes glow-breathe {
  from { opacity: 0.45; transform: translate3d(0, 0, 0); }
  to   { opacity: 1;    transform: translate3d(1.2%, -1%, 0); }
}

/* --- 星の瞬き --- */
.star {
  position: absolute;
  border-radius: 50%;
  background: #e6ecff;
  opacity: var(--tw-min, 0.08);
  animation: twinkle 4s ease-in-out infinite;
}

/* 少しだけ明るい星(数個だけ) */
.star--bright {
  box-shadow: 0 0 6px rgba(205, 218, 255, 0.8);
}

/* 星の密度変更が画面上でも分かるよう、最小限の視認性を確保 */
.bg__stars .star {
  display: block;
  min-width: 1px;
  min-height: 1px;
}

@keyframes twinkle {
  0%, 100% { opacity: var(--tw-min, 0.08); }
  50%      { opacity: var(--tw-max, 0.7); }
}

/* --- 流星(普段は見えない。JSが位置と角度を決めて発射) --- */
.shooting-star {
  position: absolute;
  left: 0;
  top: 0;
  width: 150px;
  height: 1px;
  transform: rotate(var(--sang, 120deg));
  opacity: 0;
}

.shooting-star span {
  display: block;
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(228, 238, 255, 0.85));
  transform: translateX(-60px);
}

.shooting-star.is-active {
  animation: shoot-fade 1.6s ease-out forwards;
}

.shooting-star.is-active span {
  animation: shoot-move 1.6s ease-out forwards;
}

@keyframes shoot-fade {
  0%   { opacity: 0; }
  12%  { opacity: 0.55; }
  70%  { opacity: 0.25; }
  100% { opacity: 0; }
}

@keyframes shoot-move {
  to { transform: translateX(90px); }
}


/* ------------------------------------------------------------
   5. スキップリンク
------------------------------------------------------------ */
.skip-link {
  position: fixed;
  top: -56px;
  left: 16px;
  z-index: 200;
  padding: 10px 16px;
  font-size: 0.8rem;
  background: var(--c-bg);
  border: 1px solid var(--c-line);
  transition: top 0.2s ease;
}

.skip-link:focus {
  top: 12px;
}


/* ------------------------------------------------------------
   6. ヘッダー & グローバルナビ
------------------------------------------------------------ */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: var(--c-header);
  border-bottom: 1px solid var(--c-line);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition: background-color 0.3s ease;
}

.header.is-scrolled {
  background: rgba(5, 8, 16, 0.86);
}

.header__inner {
  max-width: 1120px;
  margin-inline: auto;
  padding-inline: 24px;
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.header__logo {
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.22em;
  color: var(--c-text);
  transition: color 0.3s ease;
}

.header__logo:hover {
  color: var(--c-accent);
}

/* --- ナビ --- */
.gnav__list {
  display: flex;
  gap: 32px;
}

.gnav__link {
  display: inline-block;
  padding: 6px 2px;
  font-size: 0.82rem;
  letter-spacing: 0.14em;
  color: var(--c-text-sub);
  transition: color 0.3s ease;
}

/* ホバーで下に細い線がゆっくり伸びる */
.gnav__link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 1px;
  background: var(--c-accent);
  transform: scaleX(0);
  transform-origin: right center;
  transition: transform 0.45s var(--ease);
}

.gnav__link:hover {
  color: var(--c-text);
}

.gnav__link:hover::after {
  transform: scaleX(1);
  transform-origin: left center;
}

/* --- モバイル用メニューボタン(PCでは非表示) --- */
.menu-btn {
  display: none;
  width: 40px;
  height: 40px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
}

.menu-btn span {
  display: block;
  width: 20px;
  height: 1px;
  background: var(--c-text);
  transition: transform 0.3s var(--ease), opacity 0.3s ease;
}

.menu-btn.is-open span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.menu-btn.is-open span:nth-child(2) { opacity: 0; }
.menu-btn.is-open span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }


/* ------------------------------------------------------------
   7. Hero(ファーストビュー)
------------------------------------------------------------ */
.hero {
  min-height: 100vh;
  min-height: 100svh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: calc(var(--header-h) + 48px) 24px 64px;
}

.hero__title {
  font-size: clamp(2.4rem, 8vw, 4.4rem);
  font-weight: 600;
  letter-spacing: 0.22em;
  text-indent: 0.22em; /* letter-spacingの分だけ中央を補正 */
  line-height: 1.3;
}

.hero__sub {
  margin-top: 18px;
  font-size: 0.76rem;
  letter-spacing: 0.4em;
  text-indent: 0.4em;
  color: var(--c-text-sub);
}

.hero__desc {
  margin-top: 36px;
  font-size: 0.92rem;
  color: var(--c-text-sub);
}

.hero__explore {
  margin-top: 64px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 30px;
  font-size: 0.78rem;
  letter-spacing: 0.3em;
  text-indent: 0.1em;
  color: var(--c-text-sub);
  border: 1px solid var(--c-line);
  border-radius: 999px;
  transition: color 0.3s ease, border-color 0.3s ease, background-color 0.3s ease;
}

.hero__arrow {
  transition: transform 0.3s var(--ease);
}

.hero__explore:hover {
  color: var(--c-text);
  border-color: var(--c-line-strong);
  background: rgba(255, 255, 255, 0.03);
}

.hero__explore:hover .hero__arrow {
  transform: translateY(3px);
}

/* --- ページを開いたときの控えめなフェードイン --- */
@keyframes fade-up {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero__title,
.hero__sub,
.hero__desc,
.hero__explore {
  animation: fade-up 1s var(--ease) both;
}

.hero__title   { animation-delay: 0.15s; }
.hero__sub     { animation-delay: 0.30s; }
.hero__desc    { animation-delay: 0.45s; }
.hero__explore { animation-delay: 0.60s; }


/* ------------------------------------------------------------
   8. 汎用パーツ
------------------------------------------------------------ */
.container {
  max-width: 1040px;
  margin-inline: auto;
  padding-inline: 24px;
}

.section {
  padding-block: 120px;
}

.section-head {
  margin-bottom: 48px;
}

.section-head::before {
  content: "";
  display: block;
  width: 28px;
  height: 1px;
  margin-bottom: 22px;
  background: var(--c-accent);
  opacity: 0.75;
}

.section-head__title {
  font-size: clamp(1.6rem, 3.4vw, 2.1rem);
  font-weight: 600;
  letter-spacing: 0.16em;
}

.section-head__lead {
  margin-top: 6px;
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  color: var(--c-text-sub);
}

/* ふわっと表示(JS有効時のみ。IntersectionObserverで .is-visible を付与) */
.js [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.9s ease, transform 0.9s var(--ease);
}

.js [data-reveal].is-visible {
  opacity: 1;
  transform: translateY(0);
}


/* ------------------------------------------------------------
   9. Profile
------------------------------------------------------------ */
.profile {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 48px;
  align-items: start;
}

.profile__figure {
  border: 1px solid var(--c-line);
  border-radius: 6px;
  overflow: hidden;
  background: var(--c-panel);
}

.profile__figure img {
  width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
}

.profile__name {
  font-size: 1.15rem;
  font-weight: 600;
  letter-spacing: 0.08em;
}

.profile__role {
  margin-top: 2px;
  font-size: 0.82rem;
  letter-spacing: 0.1em;
  color: var(--c-text-sub);
}

.profile__text {
  margin-top: 20px;
  font-size: 0.92rem;
}


/* ------------------------------------------------------------
   10. Music
------------------------------------------------------------ */
.music-list {
  border-top: 1px solid var(--c-line);
}

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

.music-item {
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 20px 12px;
  transition: background-color 0.3s ease, transform 0.3s var(--ease);
}

.music-item:hover {
  background: var(--c-hover);
  transform: translateX(4px);
}

.music-item__no {
  min-width: 2em;
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  color: var(--c-text-sub);
}

.music-item__main {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.music-item__title {
  font-size: 0.98rem;
  letter-spacing: 0.04em;
}

.music-item__meta {
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  color: var(--c-text-sub);
}

.music-item__arrow {
  margin-left: auto;
  color: var(--c-text-sub);
  transition: transform 0.3s var(--ease), color 0.3s ease;
}

.music-item:hover .music-item__arrow {
  transform: translateX(3px);
  color: var(--c-accent);
}


/* ------------------------------------------------------------
   11. Works
------------------------------------------------------------ */
.works-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px 24px;
}

.work-card {
  display: flex;
  flex-direction: column;
  border: 1px solid var(--c-line);
  border-radius: 8px;
  overflow: hidden;
  background: var(--c-panel);
  transition: border-color 0.3s ease;
}

.work-card:hover {
  border-color: var(--c-line-strong);
}

.work-card__thumb {
  display: block;
  aspect-ratio: 3 / 2;
  overflow: hidden;
  background: #0c1322;
}

.work-card__thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s var(--ease), filter 0.5s ease;
}

.work-card:hover .work-card__thumb img {
  transform: scale(1.03);
  filter: brightness(1.08);
}

.work-card__body {
  display: block;
  padding: 16px 18px 18px;
}

.work-card__category {
  display: block;
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-accent);
}

.work-card__title {
  display: block;
  margin-top: 6px;
  font-size: 0.94rem;
  font-weight: 500;
  letter-spacing: 0.04em;
}


/* ------------------------------------------------------------
   12. Blog
------------------------------------------------------------ */
.blog-list {
  border-top: 1px solid var(--c-line);
}

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

.blog-item {
  display: flex;
  align-items: baseline;
  gap: 20px;
  padding: 18px 10px;
  transition: background-color 0.3s ease;
}

.blog-item:hover {
  background: var(--c-hover);
}

.blog-item__date {
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  white-space: nowrap;
  color: var(--c-text-sub);
}

.blog-item__category {
  flex-shrink: 0;
  padding: 1px 12px;
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  border: 1px solid var(--c-line);
  border-radius: 999px;
  color: var(--c-text-sub);
  white-space: nowrap;
}

.blog-item__title {
  font-size: 0.94rem;
  letter-spacing: 0.03em;
}

.blog-item__arrow {
  margin-left: auto;
  color: var(--c-text-sub);
  transition: transform 0.3s var(--ease), color 0.3s ease;
}

.blog-item:hover .blog-item__arrow {
  transform: translateX(3px);
  color: var(--c-accent);
}


/* ------------------------------------------------------------
   13. Links
------------------------------------------------------------ */
.links-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.link-card {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 20px 22px;
  border: 1px solid var(--c-line);
  border-radius: 8px;
  background: var(--c-panel);
  transition: background-color 0.3s ease, border-color 0.3s ease;
}

.link-card:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: var(--c-line-strong);
}

.link-card__body {
  flex: 1;
  min-width: 0;
}

.link-card__name {
  display: block;
  font-size: 0.95rem;
  letter-spacing: 0.06em;
}

.link-card__desc {
  display: block;
  margin-top: 2px;
  font-size: 0.76rem;
  color: var(--c-text-sub);
}

.link-card__arrow {
  color: var(--c-text-sub);
  transition: transform 0.3s var(--ease), color 0.3s ease;
}

.link-card:hover .link-card__arrow {
  transform: translate(2px, -2px);
  color: var(--c-accent);
}


/* ------------------------------------------------------------
   14. フッター
------------------------------------------------------------ */
.footer {
  padding: 56px 24px 44px;
  text-align: center;
  border-top: 1px solid var(--c-line);
  background: rgba(5, 8, 15, 0.55);
}

.footer__logo {
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.24em;
  text-indent: 0.24em;
}

.footer__sub {
  margin-top: 6px;
  font-size: 0.68rem;
  letter-spacing: 0.26em;
  text-indent: 0.26em;
  color: var(--c-text-sub);
}

.footer__copy {
  margin-top: 26px;
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--c-text-sub);
}


/* ------------------------------------------------------------
   15. クリックエフェクト
------------------------------------------------------------ */
.ripple {
  position: absolute;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.10);
  pointer-events: none;
  animation: ripple-effect 0.5s ease-out forwards;
}

/* JSがbody直下に作るクリックエフェクト用レイヤー */
#ripple-layer {
  position: fixed;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
}

#ripple-layer .ripple {
  position: absolute;
}

@keyframes ripple-effect {
  from { transform: scale(0); opacity: 0.6; }
  to   { transform: scale(1); opacity: 0; }
}


/* ------------------------------------------------------------
   16. レスポンシブ調整
------------------------------------------------------------ */

/* --- タブレット(Works 3列 → 2列) --- */
@media (max-width: 900px) {
  .works-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* --- モバイル(ナビ切替 / Profile縦積み / 余白調整) --- */
@media (max-width: 768px) {

  .section {
    padding-block: 84px;
  }

  .menu-btn {
    display: inline-flex;
  }

  .gnav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: rgba(5, 8, 16, 0.94);
    border-bottom: 1px solid var(--c-line);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-6px);
    transition: opacity 0.3s ease, transform 0.3s var(--ease), visibility 0.3s;
  }

  .gnav.is-open {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }

  .gnav__list {
    flex-direction: column;
    gap: 0;
    padding: 8px 24px 16px;
  }

  .gnav__list li + li {
    border-top: 1px solid rgba(255, 255, 255, 0.07);
  }

  .gnav__link {
    display: block;
    padding: 14px 2px;
    font-size: 0.92rem;
  }

  .gnav__link::after {
    display: none;
  }

  .profile {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .profile__figure {
    max-width: 280px;
  }

  /* 縦向きスマホだけ、背景画像に少しだけスクロール余白を持たせる */
  @media (orientation: portrait) {
    .bg__photo {
      /* サイズ自体はJSが計算する。ここでは描画時の基準位置だけ固定 */
      object-position: center top;
    }
  }
}

/* --- 小さい画面(Works 1列 / Links 1列 / Blogの折返し) --- */
@media (max-width: 600px) {

  .works-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .links-grid {
    grid-template-columns: 1fr;
  }

  .blog-item {
    display: grid;
    grid-template-columns: auto auto 1fr;
    align-items: center;
    gap: 4px 14px;
    padding: 16px 4px;
  }

  .blog-item__title {
    grid-column: 1 / -1;
  }

  .blog-item__arrow {
    grid-column: 3;
    grid-row: 1;
    justify-self: end;
  }

  .music-item {
    gap: 16px;
    padding: 16px 6px;
  }
}


/* ------------------------------------------------------------
   17. アニメーション抑制(ユーザーがOSで設定した場合)
------------------------------------------------------------ */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .js [data-reveal] {
    opacity: 1;
    transform: none;
  }

  /* 装飾系は完全に静止(流星は非表示) */
  .shooting-star {
    display: none;
  }

  .bg__glow,
  .star {
    animation: none !important;
    opacity: 0.35;
  }
}