/* ==========================================================================
   Sunshore — Base（リセット・タイポ・レイアウト土台・カーソル・ヘッダー・共通モーション状態）
   ========================================================================== */

*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }

html { -webkit-text-size-adjust: 100%; }

body {
  background: var(--c-bg);
  color: var(--c-ink);
  font-family: var(--f-sans);
  font-size: var(--step-0);
  line-height: 1.7;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

/* 慣性スクロール：body の実スクロールを content の transform に補間して反映。
   scroll-root が本来の高さを占有し、content は fixed 化して translateY される。 */
.scroll-content { will-change: transform; }
body.has-smooth .scroll-content {
  position: fixed;
  inset: 0;
  width: 100%;
}
/* スムーズ無効（reduced-motion / モバイル / 失敗時）は素のスクロールへ */

img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; cursor: pointer; background: none; border: 0; }
ol, ul { list-style: none; padding: 0; }

.mono { font-family: var(--f-mono); font-weight: 400; letter-spacing: 0.02em; }

::selection { background: var(--c-accent-soft); color: var(--c-ink); }

/* ---- 見出し共通 ---- */
.section-title {
  font-size: var(--step-3);
  line-height: 1;
  letter-spacing: -0.03em;
  font-weight: 600;
}
.section-label {
  font-size: var(--step--1);
  color: var(--c-ink-soft);
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

/* =========================================================
   カスタムカーソル（lerp 追従・水滴拡縮・マグネティック吸着）
   モバイル／reduced-motion では JS 側で非表示化
   ========================================================= */
.cursor {
  position: fixed;
  top: 0; left: 0;
  z-index: 9999;
  pointer-events: none;
  mix-blend-mode: multiply;
  opacity: 0;
  transition: opacity 0.4s ease;
}
body.cursor-active .cursor { opacity: 1; }

.cursor__dot,
.cursor__ring {
  position: absolute;
  top: 0; left: 0;
  border-radius: 50%;
  transform: translate(-50%, -50%);
  will-change: transform;
}
.cursor__dot {
  width: 6px; height: 6px;
  background: var(--c-accent);
}
.cursor__ring {
  width: 38px; height: 38px;
  border: 1px solid var(--c-turquoise);
  transition: width 0.3s var(--ease-wave), height 0.3s var(--ease-wave),
              border-color 0.3s ease, background 0.3s ease;
}
body.cursor-hover .cursor__ring {
  width: 62px; height: 62px;
  border-color: var(--c-accent);
  background: rgba(201, 164, 76, 0.06);
}
body.cursor-down .cursor__ring { width: 30px; height: 30px; }

/* 実カーソルを消すのはポインタ精細デバイスのみ（JS が body.cursor-active を付与） */
body.cursor-active,
body.cursor-active a,
body.cursor-active button,
body.cursor-active [data-magnetic] { cursor: none; }

/* =========================================================
   ヘッダー
   ========================================================= */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  padding: clamp(1rem, 2vw, 1.6rem) var(--margin);
  transition: background 0.4s ease, color 0.4s ease, transform 0.5s var(--ease-wave);
  mix-blend-mode: normal;
}
/* スクロールで自動的に隠す／出す（JS が data-hidden を付与） */
.site-header[data-hidden="true"] { transform: translateY(-110%); }

.brand {
  display: inline-flex;
  align-items: center;
  letter-spacing: -0.01em;
}
.brand__logo {
  height: clamp(30px, 3.4vw, 40px);
  width: auto;
}
.brand--footer .brand__logo { height: clamp(46px, 5vw, 60px); }

.nav {
  display: flex;
  gap: clamp(1rem, 2.4vw, 2.6rem);
  font-size: var(--step--1);
  letter-spacing: 0.02em;
}
.nav a { position: relative; padding: 0.4rem 0; color: var(--c-ink-soft); transition: color 0.3s ease; }
.nav a::after {
  content: "";
  position: absolute;
  left: 0; bottom: 0;
  width: 100%; height: 1px;
  background: currentColor;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s var(--ease-wave);
}
.nav a:hover { color: var(--c-ink); }
.nav a:hover::after { transform: scaleX(1); }

.nav-toggle { display: none; width: 32px; height: 20px; position: relative; }
.nav-toggle span {
  position: absolute; left: 0; width: 100%; height: 1.4px; background: var(--c-ink);
  transition: transform 0.4s var(--ease-wave), opacity 0.3s ease;
}
.nav-toggle span:nth-child(1) { top: 4px; }
.nav-toggle span:nth-child(2) { bottom: 4px; }
.nav-toggle[aria-expanded="true"] span:nth-child(1) { top: 9px; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { bottom: 9px; transform: rotate(-45deg); }

/* =========================================================
   共通アニメーション初期状態（JS で is-in を付与して再生）
   ========================================================= */
[data-anim-fade] {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 1s var(--ease-wave), transform 1s var(--ease-wave);
  will-change: opacity, transform;
}
[data-anim-fade].is-in { opacity: 1; transform: none; }

/* 文字スプリット：カーニングを保持するため単語は分割してもインラインで詰める */
.split-word { display: inline-block; white-space: nowrap; }
.split-char {
  display: inline-block;
  transform: translateY(1.1em) rotate(2deg);
  opacity: 0;
  will-change: transform, opacity;
  transition: transform 0.9s var(--ease-wave), opacity 0.9s var(--ease-wave);
}
.is-in .split-char { transform: none; opacity: 1; }

/* reduced-motion：すべての演出を停止し、最終状態で即時表示 */
@media (prefers-reduced-motion: reduce) {
  [data-anim-fade],
  .split-char { opacity: 1 !important; transform: none !important; transition: none !important; }
  * { scroll-behavior: auto !important; }
  .site-header { transition: none; }
}