/* ==========================================================================
   La Chambre Secrète（ラ・シャンブル・スクレット）— RIE Official Website
   静けさの中に、わずかな緊張感がある小さな美術館
   ========================================================================== */

/* --------------------------------------------------------------------------
   Design Tokens
   -------------------------------------------------------------------------- */
:root {
  --color-bg-primary: #1D241F;      /* 深いオリーブブラック */
  --color-bg-secondary: #171C19;    /* 控えめなトーン差の背景 */
  --color-bg-frame: #131715;        /* 額装・背景の暗部 */

  --color-text-main: #E8E1D5;       /* アンティークアイボリー */
  --color-text-muted: #B8B0A2;      /* 補助色（視認性を確保） */
  --color-text-dim: #A29B8F;        /* 小さな文字も判読できる明度 */

  --color-accent-bordeaux: #74333C; /* 沈んだボルドー */
  --color-accent-brass: #B49A70;    /* くすんだ真鍮色 */
  --color-border-subtle: rgba(180, 154, 112, 0.22);
  --color-border-hairline: rgba(232, 225, 213, 0.1);

  --font-serif: "Cormorant Garamond", "Shippori Mincho", "Yu Mincho", "Hiragino Mincho ProN", "Noto Serif JP", serif;
  --transition-quiet: 0.3s ease;
}

/* --------------------------------------------------------------------------
   Reset & Base
   -------------------------------------------------------------------------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  background-color: var(--color-bg-primary);
  color: var(--color-text-main);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-serif);
  font-weight: 350;
  line-height: 1.95;
  letter-spacing: 0.05em;
  background-color: var(--color-bg-primary);
  color: var(--color-text-main);
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-quiet);
}

a:hover, a:focus-visible {
  color: var(--color-accent-brass);
}

a:focus-visible,
button:focus-visible,
.artwork-card:focus-visible {
  outline: 1.5px solid var(--color-accent-brass);
  outline-offset: 4px;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
  -webkit-user-drag: none;
}

/* --------------------------------------------------------------------------
   1. 控えめな入室シークエンス
   -------------------------------------------------------------------------- */
#entrance-curtain {
  position: fixed;
  inset: 0;
  background-color: var(--color-bg-secondary);
  z-index: 9999;
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  pointer-events: none;
  opacity: 1;
  transition: opacity 0.5s ease-out;
}

#entrance-curtain.loaded {
  opacity: 0;
  visibility: hidden;
}

.entrance-brand {
  text-align: center;
  padding: 0 1.5rem;
}

.entrance-title {
  font-size: clamp(1.3rem, 3.2vw, 1.85rem);
  letter-spacing: 0.18em;
  font-weight: 300;
  color: var(--color-text-main);
  margin-bottom: 0.3rem;
}

.entrance-sub {
  font-size: 0.78rem;
  letter-spacing: 0.22em;
  color: var(--color-accent-brass);
  text-transform: uppercase;
}

/* --------------------------------------------------------------------------
   Header（3項目のみ・薄く控えめ）
   -------------------------------------------------------------------------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  padding: 1.1rem 2.2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: rgba(29, 36, 31, 0.94);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  border-bottom: 1px solid var(--color-border-hairline);
}

.header-brand {
  font-size: 1.15rem;
  letter-spacing: 0.18em;
  font-weight: 300;
  font-family: var(--font-serif);
}

.header-brand a {
  color: var(--color-text-main);
  transition: color var(--transition-quiet);
}

.header-brand a:hover {
  color: var(--color-accent-brass);
}

.nav-links {
  display: flex;
  gap: 1.8rem;
  list-style: none;
}

.nav-links a {
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  position: relative;
  padding-bottom: 2px;
}

.nav-links a::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0%;
  height: 1px;
  background-color: var(--color-accent-brass);
  transition: width var(--transition-quiet);
}

.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}

/* --------------------------------------------------------------------------
   Hero Section
   -------------------------------------------------------------------------- */
.hero-section {
  min-height: 88vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 6rem 1.5rem 3rem;
}

.hero-art-frame {
  max-width: 680px;
  width: 100%;
  margin-bottom: 2.2rem;
  background: var(--color-bg-frame);
  padding: 8px;
  border: 1px solid var(--color-border-subtle);
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.45);
}

.hero-art-inner {
  width: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  background: #111513;
}

/* 画像はトリミングせず自然に収める */
.hero-art-inner img,
.hero-art-inner svg {
  max-width: 100%;
  max-height: 62vh;
  height: auto;
  object-fit: contain;
  display: block;
}

.hero-text-block {
  max-width: 600px;
}

.hero-sub-title {
  font-size: 0.8rem;
  letter-spacing: 0.25em;
  color: var(--color-accent-brass);
  text-transform: uppercase;
  margin-bottom: 0.5rem;
}

.hero-main-copy {
  font-size: clamp(1.25rem, 2.6vw, 1.75rem);
  font-weight: 350;
  line-height: 1.65;
  letter-spacing: 0.12em;
  color: var(--color-text-main);
  margin-bottom: 0.6rem;
}

.hero-artist-tag {
  font-size: 0.8rem;
  letter-spacing: 0.2em;
  color: var(--color-text-muted);
}

/* --------------------------------------------------------------------------
   01 / WORKS（作品を最も美しく鑑賞する空間・トリミングなし）
   -------------------------------------------------------------------------- */
.section-wrapper {
  max-width: 1080px;
  margin: 0 auto;
  padding: 6rem 1.8rem;
}

.section-head {
  margin-bottom: 3.5rem;
  text-align: center;
}

.section-num {
  font-size: 0.72rem;
  letter-spacing: 0.28em;
  color: var(--color-accent-brass);
  margin-bottom: 0.25rem;
  text-transform: uppercase;
  display: block;
}

.section-title {
  font-size: clamp(1.5rem, 2.6vw, 1.95rem);
  font-weight: 350;
  letter-spacing: 0.16em;
  color: var(--color-text-main);
}

/* 作品リスト（中央配置・ゆったりとした作品ごとの呼吸） */
.works-list {
  display: flex;
  flex-direction: column;
  gap: 7rem;
  align-items: center;
}

.artwork-item {
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.artwork-card {
  cursor: pointer;
  max-width: 760px;
  width: 100%;
  transition: transform var(--transition-quiet);
}

.artwork-card:hover {
  transform: translateY(-2px);
}

.artwork-frame {
  background: var(--color-bg-frame);
  padding: 8px;
  border: 1px solid var(--color-border-subtle);
  box-shadow: 0 14px 32px rgba(0, 0, 0, 0.4);
  display: flex;
  justify-content: center;
  align-items: center;
}

.artwork-canvas {
  width: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  background-color: #111513;
}

/* トリミングせず縦横比を完全に維持 */
.artwork-canvas img,
.artwork-canvas svg {
  max-width: 100%;
  max-height: 72vh;
  width: auto;
  height: auto;
  object-fit: contain;
  display: block;
}

/* 作品情報（余計な解説を排除し、事実のみを静かに添える） */
.artwork-meta {
  margin-top: 1.1rem;
  text-align: center;
}

.artwork-title {
  font-size: 0.95rem;
  font-weight: 400;
  letter-spacing: 0.12em;
  color: var(--color-text-main);
  margin-bottom: 0.2rem;
}

.artwork-specs {
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  color: var(--color-text-dim);
}

.artwork-specs span::after {
  content: " / ";
  color: rgba(180, 154, 112, 0.35);
}

.artwork-specs span:last-child::after {
  content: "";
}

/* --------------------------------------------------------------------------
   02 / STATEMENT（通路の壁に刻まれたような静寂の2文）
   -------------------------------------------------------------------------- */
.statement-section {
  background-color: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border-hairline);
  border-bottom: 1px solid var(--color-border-hairline);
  padding: 8rem 2rem;
}

.statement-inner {
  max-width: 580px;
  margin: 0 auto;
  text-align: center;
}

.statement-body {
  font-size: 1.05rem;
  line-height: 2.4;
  color: var(--color-text-main);
  letter-spacing: 0.09em;
  font-weight: 350;
}

.statement-body p {
  margin-bottom: 1.8rem;
}

.statement-body p:last-child {
  margin-bottom: 0;
}

.statement-author {
  margin-top: 2.4rem;
  font-family: "Baskerville", "Palatino Linotype", "Book Antiqua", Georgia, serif;
  font-size: 0.88rem;
  letter-spacing: 0.16em;
  color: var(--color-accent-brass);
}

/* --------------------------------------------------------------------------
   03 / PROFILE & CONTACT（作家紹介と連絡先の自然な統合）
   -------------------------------------------------------------------------- */
.profile-contact-section {
  padding: 7rem 2rem 5.5rem;
}

.profile-contact-card {
  max-width: 580px;
  margin: 0 auto;
}

.profile-block {
  text-align: center;
  margin-bottom: 3rem;
}

.profile-name {
  margin: 1.4rem 0 0.75rem;
}

.profile-name img {
  width: clamp(9rem, 15vw, 10.75rem);
  height: auto;
  margin-inline: auto;
}

.profile-role {
  font-size: 0.76rem;
  letter-spacing: 0.2em;
  color: var(--color-accent-brass);
  text-transform: uppercase;
  margin-bottom: 1.2rem;
}

.profile-desc {
  font-size: 0.9rem;
  line-height: 2.1;
  color: var(--color-text-muted);
}

.contact-wrap {
  border: 1px solid var(--color-border-subtle);
  background: var(--color-bg-secondary);
  padding: 2.2rem 1.8rem;
}

.contact-title {
  font-size: 0.85rem;
  letter-spacing: 0.16em;
  color: var(--color-accent-brass);
  text-transform: uppercase;
  margin-bottom: 1.4rem;
  text-align: center;
}

.form-group {
  margin-bottom: 1.2rem;
}

.form-group label {
  display: block;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
  margin-bottom: 0.35rem;
}

.form-group input,
.form-group textarea {
  width: 100%;
  background: var(--color-bg-primary);
  border: 1px solid var(--color-border-subtle);
  color: var(--color-text-main);
  padding: 0.7rem;
  font-family: inherit;
  font-size: 0.86rem;
  outline: none;
  transition: border-color var(--transition-quiet);
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--color-accent-brass);
}

.form-actions {
  display: flex;
  gap: 0.8rem;
  margin-top: 1.5rem;
}

.btn-quiet {
  flex: 1;
  background: transparent;
  color: var(--color-accent-brass);
  border: 1px solid var(--color-accent-brass);
  padding: 0.75rem 1rem;
  font-family: inherit;
  font-size: 0.8rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  cursor: pointer;
  text-align: center;
  transition: background-color var(--transition-quiet), color var(--transition-quiet);
}

.btn-quiet:hover {
  background-color: var(--color-accent-brass);
  color: var(--color-bg-primary);
}

.btn-quiet.secondary {
  border-color: var(--color-border-subtle);
  color: var(--color-text-muted);
}

.btn-quiet.secondary:hover {
  background-color: var(--color-border-subtle);
  color: var(--color-text-main);
}

.form-status-msg {
  margin-top: 0.8rem;
  font-size: 0.78rem;
  color: var(--color-accent-brass);
  display: none;
  text-align: center;
}

/* --------------------------------------------------------------------------
   Lightbox Modal
   -------------------------------------------------------------------------- */
.lightbox-modal {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  max-width: none;
  max-height: none;
  margin: 0;
  border: 0;
  color: var(--color-text-main);
  background-color: rgba(22, 27, 24, 0.97);
  z-index: 10000;
  display: none;
  justify-content: center;
  align-items: center;
  padding: 1.2rem;
}

.lightbox-modal[open] {
  display: flex;
}

.lightbox-modal::backdrop {
  background: #171C19;
}

.lightbox-close-btn {
  position: absolute;
  top: 1.2rem;
  right: 1.8rem;
  background: none;
  border: none;
  color: var(--color-text-muted);
  font-size: 2rem;
  font-weight: 200;
  cursor: pointer;
  line-height: 1;
  padding: 0.5rem;
  transition: color var(--transition-quiet);
  z-index: 10001;
}

.lightbox-close-btn:hover {
  color: var(--color-accent-brass);
}

.lightbox-content {
  max-width: 960px;
  width: 100%;
  max-height: 100%;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.lightbox-image-wrap {
  max-width: 100%;
  max-height: 78vh;
  background: #0d110f;
  border: 1px solid var(--color-border-subtle);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.7);
  display: flex;
  justify-content: center;
  align-items: center;
}

.lightbox-image-wrap img,
.lightbox-image-wrap svg {
  max-width: 100%;
  max-height: 78vh;
  width: auto;
  height: auto;
  object-fit: contain;
  display: block;
}

.lightbox-meta {
  margin-top: 1rem;
  text-align: center;
}

.lightbox-title {
  font-size: 0.95rem;
  font-weight: 400;
  letter-spacing: 0.12em;
  color: var(--color-text-main);
  margin-bottom: 0.2rem;
}

.lightbox-specs {
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  color: var(--color-text-dim);
}

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */
.site-footer {
  border-top: 1px solid var(--color-border-hairline);
  padding: 3rem 1.5rem;
  text-align: center;
  font-size: 0.74rem;
  letter-spacing: 0.16em;
  color: var(--color-text-dim);
  background-color: var(--color-bg-secondary);
}

/* --------------------------------------------------------------------------
   Responsive (Smartphone)
   -------------------------------------------------------------------------- */
@media (max-width: 767px) {
  .site-header {
    padding: 0.9rem 1.2rem;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.3rem 1.2rem;
  }

  .nav-links {
    gap: 1.1rem;
  }

  .nav-links a {
    font-size: 0.72rem;
    letter-spacing: 0.12em;
  }

  .hero-section {
    padding: 8rem 1rem 2.5rem;
    min-height: 80vh;
  }

  .works-list {
    gap: 4.5rem;
  }

  .artwork-canvas img,
  .artwork-canvas svg {
    max-height: 60vh;
  }

  .section-wrapper {
    padding: 4.5rem 1.2rem;
  }

  .statement-section {
    padding: 5.5rem 1.2rem;
  }

  .statement-body {
    font-size: 0.98rem;
    line-height: 2.2;
  }

  .profile-contact-section {
    padding: 5rem 1.2rem 4rem;
  }

  .contact-wrap {
    padding: 1.6rem 1.1rem;
  }

  .form-actions {
    flex-direction: column;
  }

  .btn-quiet {
    width: 100%;
  }

  .lightbox-close-btn {
    top: 0.8rem;
    right: 1rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  #entrance-curtain {
    display: none !important;
  }
}

/* 読み上げ、狭い画面、公開用文書 */
[hidden] { display: none !important; }
fieldset { border: 0; min-width: 0; }
section[id] { scroll-margin-top: 8rem; }
a, p, h1, h2, h3, label { overflow-wrap: anywhere; }
input, textarea { border-radius: 0; }
.form-group input, .form-group textarea {
  font-size: 1rem;
  border-color: #8A8478;
}
.form-group input:focus-visible, .form-group textarea:focus-visible {
  outline: 2px solid var(--color-accent-brass);
  outline-offset: 3px;
}
.btn-quiet:disabled { cursor: wait; opacity: 0.65; }
.form-status-msg:not(:empty) { display: block; }
.privacy-note, .contact-availability, .preview-note, .rights-note {
  font-size: 0.82rem;
  line-height: 1.9;
  margin-block: 1rem;
  color: var(--color-text-muted);
}
.privacy-note a, .site-footer a, .legal-page a {
  text-decoration: underline;
  text-underline-offset: 0.25em;
}
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}
.skip-link {
  position: fixed;
  top: 0.5rem;
  left: 0.5rem;
  transform: translateY(-200%);
  padding: 0.6rem 1rem;
  background: var(--color-bg-secondary);
  z-index: 10002;
}
.skip-link:focus { transform: translateY(0); }
.legal-page { max-width: 48rem; margin: auto; padding: 3rem 1.5rem; }
.legal-page h1 { font-size: 1.6rem; margin-block: 2rem; }
.legal-page h2 { font-size: 1.1rem; margin-block: 2rem 0.8rem; }
.legal-page p { margin-block: 1rem; }
.lightbox-close-btn { min-width: 44px; min-height: 44px; }
.hero-site-title {
  font-size: clamp(1.7rem, 5vw, 3rem);
  font-weight: 350;
  letter-spacing: 0.13em;
  margin-bottom: 2rem;
}
.coming-soon { text-align: center; padding-block: 3rem; }