/* ============================================
   なおちゃんの世界 — グローバル変数（色・余白の一元管理）
   詳細ページを増やすときもここを触れば全体のトーンを揃えやすい
   ============================================ */
:root {
  --color-sky-top: #c8e8ff;
  --color-sky-mid: #e8f4ff;
  --color-sky-bottom: #f5f9ff;
  --color-text: #2a3f55;
  --color-text-muted: #5a6f82;
  --color-accent: #6ba3d4;
  --color-accent-soft: rgba(107, 163, 212, 0.35);
  --glass-bg: rgba(255, 255, 255, 0.45);
  --glass-border: rgba(255, 255, 255, 0.65);
  --shadow-soft: 0 8px 32px rgba(80, 130, 180, 0.12);
  --radius-lg: 20px;
  --radius-md: 14px;
  --space-section: clamp(3rem, 8vw, 5.5rem);
  --font-sans: "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Yu Gothic UI", "Yu Gothic", Meiryo, system-ui, sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-sans);
  color: var(--color-text);
  line-height: 1.65;
  position: relative;
  overflow-x: hidden;
}

/* 青空＋柔らかい光のベース（body 直下の装飾レイヤー） */
.bg-sky {
  position: fixed;
  inset: 0;
  z-index: -1;
  background: linear-gradient(
    165deg,
    var(--color-sky-top) 0%,
    var(--color-sky-mid) 42%,
    var(--color-sky-bottom) 100%
  );
  pointer-events: none;
}

/* 幻想的なハイライト（放射グラデーションを重ねる） */
.bg-sky::before {
  content: "";
  position: absolute;
  top: -20%;
  left: 50%;
  transform: translateX(-50%);
  width: 120%;
  height: 70%;
  background: radial-gradient(
    ellipse at 50% 0%,
    rgba(255, 255, 255, 0.75) 0%,
    rgba(255, 255, 255, 0) 55%
  );
  opacity: 0.85;
}

.bg-sky::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 40%;
  background: linear-gradient(to top, rgba(200, 230, 255, 0.35), transparent);
}

/* --- ヘッダー: 半透明で「透明感」 --- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  background: rgba(255, 255, 255, 0.35);
  border-bottom: 1px solid var(--glass-border);
}

.site-header__inner {
  max-width: 960px;
  margin: 0 auto;
  padding: 0.85rem 1.25rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}

.site-logo {
  font-weight: 700;
  font-size: 1rem;
  color: var(--color-text);
  text-decoration: none;
  letter-spacing: 0.04em;
}

.site-logo:hover,
.site-logo:focus-visible {
  color: var(--color-accent);
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1rem;
}

.site-nav a {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  text-decoration: none;
  padding: 0.25rem 0;
  border-bottom: 2px solid transparent;
  transition: color 0.2s, border-color 0.2s;
}

.site-nav a:hover,
.site-nav a:focus-visible {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent-soft);
}

/* --- ヒーロー --- */
.hero {
  padding: clamp(3rem, 12vw, 6rem) 1.25rem;
  text-align: center;
}

.hero__content {
  max-width: 640px;
  margin: 0 auto;
  padding: clamp(1.75rem, 5vw, 2.75rem) clamp(1.25rem, 4vw, 2rem);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-soft);
}

.hero__title {
  margin: 0 0 0.5rem;
  font-size: clamp(1.65rem, 5vw, 2.25rem);
  font-weight: 700;
  letter-spacing: 0.06em;
  line-height: 1.3;
}

.hero__tagline {
  margin: 0;
  font-size: clamp(0.95rem, 2.5vw, 1.1rem);
  color: var(--color-text-muted);
  letter-spacing: 0.08em;
}

/* --- セクション共通 --- */
.section {
  padding: var(--space-section) 1.25rem;
}

.section--world {
  padding-top: 0;
}

.section__inner {
  max-width: 960px;
  margin: 0 auto;
}

.section__title {
  margin: 0 0 0.5rem;
  font-size: clamp(1.25rem, 3vw, 1.5rem);
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: none;
  color: var(--color-text);
}

.section__lead {
  margin: 0 0 1.75rem;
  max-width: 52ch;
  color: var(--color-text-muted);
  font-size: 0.95rem;
}

.section--last {
  padding-bottom: clamp(3rem, 10vw, 5rem);
}

/* --- World: 作品カード一覧（グリッドで増設しやすい） --- */
.work-card-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.25rem;
}

.work-card {
  margin: 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-soft);
  border: 1px solid var(--glass-border);
  background: var(--glass-bg);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.work-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 14px 40px rgba(80, 130, 180, 0.18);
}

.work-card__link {
  display: flex;
  flex-direction: column;
  height: 100%;
  color: inherit;
  text-decoration: none;
  outline: none;
}

.work-card__link:focus-visible {
  box-shadow: 0 0 0 3px var(--color-accent-soft);
}

/* サムネ枠: 将来 img を置くときはこの中に */
.work-card__thumb {
  display: block;
  aspect-ratio: 16 / 10;
  background: linear-gradient(
    135deg,
    rgba(180, 220, 255, 0.6) 0%,
    rgba(255, 255, 255, 0.5) 50%,
    rgba(200, 230, 255, 0.45) 100%
  );
  border-bottom: 1px solid var(--glass-border);
}

.work-card__body {
  padding: 1rem 1.1rem 1.15rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.work-card__title {
  font-weight: 700;
  font-size: 1.05rem;
}

.work-card__meta {
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

/* --- Shop / Profile / Other: 仮プレースホルダー --- */
.placeholder-card {
  padding: 1.5rem 1.25rem;
  border-radius: var(--radius-md);
  border: 1px dashed rgba(90, 111, 130, 0.35);
  background: rgba(255, 255, 255, 0.35);
  color: var(--color-text-muted);
  text-align: center;
}

.placeholder-card p {
  margin: 0;
}

/* --- フッター --- */
.site-footer {
  padding: 1.5rem 1.25rem 2rem;
  text-align: center;
  color: var(--color-text-muted);
}

.site-footer__copy {
  margin: 0;
}

/* --- アクセシビリティ: キーボードフォーカス --- */
:focus:not(:focus-visible) {
  outline: none;
}

/* --- モバイル: ナビをややコンパクトに --- */
@media (max-width: 520px) {
  .site-header__inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .site-nav {
    width: 100%;
    justify-content: flex-start;
  }
}