/*================================================
  基本設定と変数
=================================================*/
:root {
  --color-bg: #121212;
  --color-surface: #1e1e1e;
  --color-primary: #ffffff;
  --color-secondary: #aaaaaa;
  --color-accent-start: #0072ff;
  --color-accent-end: #00c6ff;
  --color-border: rgba(255, 255, 255, 0.1);
  --bg-image: url("../images/background.png");
  --font-base: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Hiragino Sans", "Noto Sans CJK JP", "Yu Gothic", sans-serif;
  --radius: 12px;
  --content-width: 1100px;
  --header-height: 80px;
}

/*================================================
  基本的なスタイルリセットと共通設定
=================================================*/
*, *::before, *::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  background-color: var(--color-bg);
  color: var(--color-primary);
  font-family: var(--font-base);
  font-weight: 500;
  line-height: 1.7;
  background-image: var(--bg-image);
  transition: background-color 0.3s ease, color 0.3s ease, background-image 0.3s ease;
  color-scheme: dark;
}

/* Hide the main layout until the first view overlay is mounted */
html[data-first-view="pending"] body > * {
  visibility: hidden;
}

html[data-first-view="pending"] body > .first-view-overlay {
  visibility: visible;
}

html[data-theme="white"] {
  --color-bg: #f5f7fb;
  --color-surface: #ffffff;
  --color-primary: #111111;
  --color-secondary: #4a4a4a;
  --color-border: rgba(17, 17, 17, 0.1);
  --bg-image: url("../images/background-light.png");
  color-scheme: light;
}

img {
  max-width: 100%;
  height: auto;
  vertical-align: middle;
}

a {
  color: var(--color-accent-end);
  text-decoration: none;
  transition: opacity 0.2s;
}
a:hover {
  opacity: 0.8;
}

h1, h2, h3 {
  line-height: 1.4;
  font-weight: 700;
}

.no-break {
  white-space: nowrap;
  word-break: keep-all;
  line-break: strict;
}

.container {
  max-width: var(--content-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}
.container.narrow {
    max-width: 800px;
}

/*================================================
  ヘッダー
=================================================*/
.site-header {
  padding: 1rem 0;
  border-bottom: 1px solid var(--color-border);
}
.main-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap; 
  gap: 1rem;
}
.brand {
  display: flex;
  align-items: center;
}
.nav-left {
  display: flex;
  align-items: center;
  gap: 2rem;
  list-style: none;
  padding: 0;
  margin: 0;
}
.nav-left a {
  color: var(--color-secondary);
  font-weight: bold;
  padding: 0.5rem 0;
  border-bottom: 2px solid transparent;
}
.nav-left a:hover,
body[data-page="home"] [data-nav="home"],
body[data-page="about"] [data-nav="about"],
body[data-page="contact"] [data-nav="contact"] {
  color: var(--color-primary);
  border-bottom-color: var(--color-accent-end);
}
.nav-right {
  display: flex;
  align-items: center;
  gap: 1rem;
}
.nav-right img {
  width: 28px;
  height: 28px;
}
.mode-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.8rem;
  height: 2.8rem;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.25);
  background: rgba(255, 255, 255, 0.12);
  color: var(--color-primary);
  flex-shrink: 0;
  cursor: pointer;
  transition: transform 0.2s ease, background 0.3s ease, border-color 0.3s ease, color 0.3s ease, box-shadow 0.3s ease;
}
.mode-toggle:hover {
  transform: translateY(-1px);
  background: rgba(255, 255, 255, 0.2);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
}
.mode-toggle:focus-visible {
  outline: 2px solid var(--color-accent-end);
  outline-offset: 3px;
}
.mode-toggle__icon {
  width: 1.6rem;
  height: 1.6rem;
  transition: transform 0.3s ease, opacity 0.3s ease;
  object-fit: contain;
  pointer-events: none;
}
.mode-toggle.is-light {
  border-color: rgba(17, 17, 17, 0.18);
  background: rgba(255, 255, 255, 0.9);
  color: #111111;
  box-shadow: 0 10px 24px rgba(17, 17, 17, 0.16);
}
.mode-toggle.is-light .mode-toggle__icon {
  transform: rotate(-20deg);
}
html[data-theme="white"] .mode-toggle {
  border-color: rgba(17, 17, 17, 0.2);
  background: rgba(17, 17, 17, 0.08);
  color: var(--color-primary);
  box-shadow: none;
}
html[data-theme="white"] .mode-toggle:hover {
  background: rgba(17, 17, 17, 0.12);
}
html[data-theme="white"] img[data-invert-on-white="true"] {
  filter: invert(1);
}


/*================================================
  メインコンテンツ
=================================================*/
main.page {
  padding-top: 3rem;
  padding-bottom: 3rem;
}
.section {
    padding: 3rem 0;
}
.section.alt {
    background-color: var(--color-surface);
}

/*================================================
  トップページ: ヒーローセクション
=================================================*/
.hero {
  padding: 4rem 0;
  text-align: center;
}

.hero > h1 {
  font-size: 2.8rem;
  margin-top: 0;
  margin-bottom: 2.5rem;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.35em;
  text-wrap: balance;   /* 行のバランスを最適化 */
  word-break: keep-all; /* 単語や中点で折らない */
  line-break: strict;   /* 日本語禁則処理 */
}

.hero > h1 span {
  display: inline-block;
  white-space: nowrap;  /* 各語の途中で折れない */
}

.hero-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2.5rem;
}
.hero-media, .hero-copy {
  width: 100%;
}
.hero-copy {
  text-align: center;
  max-width: 800px;
}
.hero-copy .lead {
  font-size: 1.25rem;
  margin-bottom: 1.5rem;
}
.hero-copy .greeting {
  color: var(--color-secondary);
}

/*================================================
  汎用グリッド
=================================================*/
.grid {
  display: grid;
  gap: 1.5rem;
}
.grid.two {
  grid-template-columns: repeat(2, 1fr);
}

/* ギャラリー */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}
.gallery-grid img {
  border-radius: var(--radius);
  aspect-ratio: 1 / 1;
  object-fit: cover;
  width: 100%;
}

/*================================================
  コンポーネント（ボタン、カードなど）
=================================================*/
.cta-row {
  margin-top: 2rem;
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: center;
  justify-content: center;
}
.btn {
  display: inline-block;
  padding: 0.75rem 1.75rem;
  border-radius: 9999px;
  font-weight: bold;
  text-align: center;
  border: 2px solid transparent;
  transition: transform 0.2s;
}
.btn:hover {
  transform: translateY(-2px);
}
.btn.primary {
  background: linear-gradient(45deg, var(--color-accent-start), var(--color-accent-end));
  color: var(--color-primary);
}
.btn.ghost {
  border-color: var(--color-secondary);
  color: var(--color-primary);
}
.btn.lg {
  padding: 1rem 2rem;
}

/* カード */
.card {
  background-color: var(--color-surface);
  padding: 2rem;
  border-radius: var(--radius);
}
.card.info {
  background: linear-gradient(45deg, rgba(0, 114, 255, 0.1), rgba(0, 198, 255, 0.1));
  border: 1px solid var(--color-accent-start);
}

/* お問い合わせページ */
.contact-actions {
  margin-top: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

/* ABOUTページ: コンテンツ中央配置のまま文字を左揃え */
body[data-page="about"] .page .container {
  text-align: left;
}
body[data-page="about"] .about-details {
  margin-top: 2.5rem;
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
}
body[data-page="about"] .about-details > div {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
body[data-page="about"] .about-details h2 {
  margin: 0;
}
body[data-page="about"] .about-details p {
  margin: 0;
}
body[data-page="about"] .about-details p + p {
  margin-top: 0.5rem;
}

.checklist {
  list-style: "? ";
  padding-left: 1.5rem;
}
.muted {
  color: var(--color-secondary);
  font-size: 0.9rem;
}

/*================================================
  フッター
=================================================*/
.site-footer {
  text-align: center;
  padding: 3rem 0;
  color: var(--color-secondary);
  border-top: 1px solid var(--color-border);
}

/*================================================
  レスポンシブ設定
=================================================*/
@media (max-width: 768px) {
  .main-nav {
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
  }
  .nav-left {
    order: 3;
    width: 100%;
    margin-top: 0.5rem;
    gap: 1rem;
    font-size: 0.9rem;
    flex-wrap: wrap; 
    justify-content: center;
  }

  .nav-right {
    order: 2;
    width: auto;
    margin-left: auto;
    justify-content: flex-end;
    gap: 0.75rem;
    align-self: flex-start;
  }

  .mode-toggle {
    margin: 0;
  }

  .hero {
    padding: 2rem 0;
  }
  .hero > h1 {
    font-size: 2rem;
    flex-direction: column;   /* ← スマホでは縦並びに */
    align-items: center;
    gap: 0.2em;
  }

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

  .gallery-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}