/* ==========================================================
   海中画廊 — Portfolio Stylesheet
   深夜の図書館・美術館のような、静かで上品な世界観
   ========================================================== */

:root {
  /* 配色：深い墨紺を基調に、真鍮色をアクセントに */
  --color-bg: #10141f;            /* 深いダークネイビー（墨紺） */
  --color-bg-soft: #161b29;       /* カードなどの少し明るい面 */
  --color-ink: #e8e4da;           /* 生成り色の文字 */
  --color-ink-dim: #8b8778;       /* 控えめな文字 */
  --color-accent: #c2a05e;        /* 真鍮・古金色のアクセント */
  --color-line: rgba(194, 160, 94, 0.25);

  --font-serif-jp: "Shippori Mincho", "Hiragino Mincho ProN", serif;
  --font-serif-en: "Cormorant Garamond", Georgia, serif;

  --space-section: clamp(4rem, 10vw, 8rem);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  background-color: var(--color-bg);
  /* 奥行きを感じるごく淡いグラデーション */
  background-image:
    radial-gradient(ellipse 80% 50% at 50% -10%, rgba(194, 160, 94, 0.06), transparent),
    radial-gradient(ellipse 60% 40% at 80% 110%, rgba(70, 90, 140, 0.08), transparent);
  color: var(--color-ink);
  font-family: var(--font-serif-jp);
  font-weight: 400;
  line-height: 1.9;
  letter-spacing: 0.06em;
  min-height: 100vh;
}

/* ----------------------------------------------------------
   ヘッダー
   ---------------------------------------------------------- */
.site-header {
  text-align: center;
  padding: var(--space-section) 2rem calc(var(--space-section) * 0.6);
}

.site-header__eyebrow {
  font-family: var(--font-serif-en);
  font-size: 0.85rem;
  letter-spacing: 0.45em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 1.75rem;
}

.site-header__title {
  font-size: clamp(2rem, 5vw, 3.25rem);
  font-weight: 500;
  letter-spacing: 0.25em;
  margin-bottom: 2rem;
}

/* タイトル下の細い飾り線 */
.site-header__title::after {
  content: "";
  display: block;
  width: 3.5rem;
  height: 1px;
  background: var(--color-accent);
  margin: 2rem auto 0;
  opacity: 0.6;
}

.site-header__lead {
  font-size: 0.95rem;
  color: var(--color-ink-dim);
  letter-spacing: 0.12em;
}

/* ----------------------------------------------------------
   ジャンルフィルター
   ---------------------------------------------------------- */
.filter {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.5rem 2.5rem;
  padding: 0 2rem 4rem;
}

.filter__btn {
  appearance: none;
  background: none;
  border: none;
  cursor: pointer;
  font-family: var(--font-serif-jp);
  font-size: 0.9rem;
  letter-spacing: 0.2em;
  color: var(--color-ink-dim);
  padding: 0.5rem 0.25rem;
  position: relative;
  transition: color 0.4s ease;
}

.filter__btn::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 0;
  width: 0;
  height: 1px;
  background: var(--color-accent);
  transition: width 0.4s ease, left 0.4s ease;
}

.filter__btn:hover {
  color: var(--color-ink);
}

.filter__btn.is-active {
  color: var(--color-accent);
}

.filter__btn.is-active::after {
  left: 0;
  width: 100%;
}

/* ----------------------------------------------------------
   作品グリッド
   ---------------------------------------------------------- */
.gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: clamp(1.5rem, 3vw, 3rem);
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 clamp(1.5rem, 4vw, 3rem) var(--space-section);
}

.gallery__item {
  cursor: pointer;
  background: var(--color-bg-soft);
  border: 1px solid var(--color-line);
  padding: 0.9rem;                     /* 額縁のようなマット */
  opacity: 0;
  transform: translateY(16px);
  animation: fade-in 0.9s ease forwards;
  transition: border-color 0.5s ease, transform 0.5s ease;
}

.gallery__item:hover {
  border-color: rgba(194, 160, 94, 0.6);
  transform: translateY(-4px);
}

/* 表示時にひとつずつ浮かび上がる */
@keyframes fade-in {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.gallery__frame {
  overflow: hidden;
  aspect-ratio: 4 / 5;
}

.gallery__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  filter: brightness(0.92);
  transition: filter 0.6s ease, transform 0.8s ease;
}

.gallery__item:hover .gallery__img {
  filter: brightness(1);
  transform: scale(1.04);
}

.gallery__meta {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  padding: 0.9rem 0.2rem 0.2rem;
}

.gallery__title {
  font-size: 0.85rem;
  letter-spacing: 0.12em;
}

.gallery__genre {
  font-family: var(--font-serif-en);
  font-style: italic;
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--color-accent);
  white-space: nowrap;
}

/* フィルターで隠す */
.gallery__item.is-hidden {
  display: none;
}

/* ----------------------------------------------------------
   ライトボックス
   ---------------------------------------------------------- */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(10, 13, 20, 0.94);
  backdrop-filter: blur(6px);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.4s ease, visibility 0.4s ease;
}

.lightbox.is-open {
  opacity: 1;
  visibility: visible;
}

.lightbox__figure {
  max-width: min(88vw, 1100px);
  text-align: center;
}

.lightbox__img {
  max-width: 100%;
  max-height: 78vh;
  display: block;
  margin: 0 auto;
  border: 1px solid var(--color-line);
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.6);
}

.lightbox__caption {
  margin-top: 1.5rem;
  display: flex;
  justify-content: center;
  align-items: baseline;
  gap: 1.5rem;
}

.lightbox__title {
  font-size: 0.95rem;
  letter-spacing: 0.2em;
}

.lightbox__genre {
  font-family: var(--font-serif-en);
  font-style: italic;
  font-size: 0.85rem;
  color: var(--color-accent);
}

/* 閉じる・前後ボタン */
.lightbox__close,
.lightbox__nav {
  appearance: none;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--color-ink-dim);
  font-family: var(--font-serif-en);
  line-height: 1;
  transition: color 0.3s ease;
  z-index: 101;
}

.lightbox__close:hover,
.lightbox__nav:hover {
  color: var(--color-accent);
}

.lightbox__close {
  position: absolute;
  top: 1.5rem;
  right: 2rem;
  font-size: 2.5rem;
  font-weight: 300;
}

.lightbox__nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  font-size: 3.5rem;
  padding: 1rem;
}

.lightbox__nav--prev { left: 1rem; }
.lightbox__nav--next { right: 1rem; }

/* ----------------------------------------------------------
   プロフィール
   ---------------------------------------------------------- */
.profile {
  text-align: center;
  max-width: 620px;
  margin: 0 auto;
  padding: calc(var(--space-section) * 0.75) 2rem;
  border-top: 1px solid rgba(194, 160, 94, 0.12);
}

.profile__eyebrow {
  font-family: var(--font-serif-en);
  font-size: 0.8rem;
  letter-spacing: 0.45em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 1.75rem;
}

.profile__name {
  font-size: 1.5rem;
  font-weight: 500;
  letter-spacing: 0.35em;
  text-indent: 0.35em; /* 字間ぶんの右寄りを補正して中央に */
  margin-bottom: 1.25rem;
}

.profile__bio {
  font-size: 0.9rem;
  color: var(--color-ink-dim);
  letter-spacing: 0.12em;
  margin-bottom: 2.5rem;
}

.profile__links {
  list-style: none;
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 1rem 3rem;
}

.profile__link {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-serif-jp);
  font-size: 0.85rem;
  letter-spacing: 0.18em;
  color: var(--color-ink-dim);
  text-decoration: none;
  padding-bottom: 0.3rem;
  border-bottom: 1px solid transparent;
  transition: color 0.4s ease, border-color 0.4s ease;
}

.profile__link:hover {
  color: var(--color-accent);
  border-bottom-color: var(--color-line);
}

.profile__icon {
  width: 1.1em;
  height: 1.1em;
}

/* ----------------------------------------------------------
   フッター
   ---------------------------------------------------------- */
.site-footer {
  text-align: center;
  padding: 3rem 2rem 4rem;
  border-top: 1px solid rgba(194, 160, 94, 0.12);
}

.site-footer__note {
  font-family: var(--font-serif-en);
  font-size: 0.8rem;
  letter-spacing: 0.25em;
  color: var(--color-ink-dim);
}

/* ----------------------------------------------------------
   モバイル調整
   ---------------------------------------------------------- */
@media (max-width: 600px) {
  .gallery {
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
  }

  .gallery__meta {
    flex-direction: column;
    gap: 0.1rem;
  }

  .lightbox__nav {
    font-size: 2.5rem;
    padding: 0.5rem;
  }

  .lightbox__close {
    right: 1rem;
  }
}