/* KANON — 奏でた音が、花になる。 */

:root {
  --ink: #f2ecec;
  --ink-dim: rgba(242, 236, 236, 0.55);
  --accent: #e8a0b8;      /* 春: 桜 */
  --bg: #0b0813;
  --serif: 'Shippori Mincho B1', serif;
  --sans: 'Zen Kaku Gothic New', sans-serif;
  --mono: 'IBM Plex Mono', monospace;
  --load: 0;
}
body[data-season="natsu"] { --accent: #8fe6a0; }
body[data-season="aki"]   { --accent: #eab276; }
body[data-season="fuyu"]  { --accent: #a8c4e8; }

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

html, body {
  height: 100%;
  overflow: hidden;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--serif);
  -webkit-font-smoothing: antialiased;
}

body.has-cursor { cursor: none; }
body.has-cursor a, body.has-cursor button { cursor: none; }

.mono { font-family: var(--mono); }

/* 明るい季節（春・夏）でも文字が読めるよう、常時うっすら影 */
.site-header, .intro, .stage-caption, .site-footer {
  text-shadow: 0 1px 3px rgba(8, 6, 20, 0.55), 0 4px 26px rgba(8, 6, 20, 0.40);
}
.brand__mark { filter: drop-shadow(0 1px 2px rgba(8, 6, 20, 0.5)); }

/* ═══════════ WebGL キャンバス ═══════════ */
.garden-canvas {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100vh;
  display: block;
}

body.no-webgl .garden-canvas { display: none; }
body.no-webgl {
  background:
    radial-gradient(ellipse 90% 60% at 50% 100%, #221224 0%, transparent 60%),
    linear-gradient(to bottom, #0a0716 0%, #171024 55%, #241226 100%);
}

/* フィルムグレイン */
.grain {
  position: fixed;
  inset: -50%;
  pointer-events: none;
  z-index: 3;
  opacity: 0.05;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2'/%3E%3C/filter%3E%3Crect width='120' height='120' filter='url(%23n)'/%3E%3C/svg%3E");
  animation: grain 7s steps(8) infinite;
}
@keyframes grain {
  0%, 100% { transform: translate(0, 0); }
  25% { transform: translate(-2%, 3%); }
  50% { transform: translate(3%, -2%); }
  75% { transform: translate(-3%, -3%); }
}

/* ═══════════ ローダー ═══════════ */
.loader {
  position: fixed;
  inset: 0;
  z-index: 60;
  background: var(--bg);
  display: grid;
  place-items: center;
  transition: opacity 1.1s ease 0.25s, visibility 1.1s ease 0.25s;
}
body.is-loaded .loader { opacity: 0; visibility: hidden; }

.loader__bloom {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 42vmin;
  height: 42vmin;
  transform: translate(-50%, -50%) scale(calc(0.25 + var(--load) * 0.75));
  border-radius: 50%;
  background:
    radial-gradient(circle at 50% 50%, rgba(232, 160, 184, calc(var(--load) * 0.22)) 0%, transparent 55%),
    radial-gradient(circle at 50% 42%, rgba(232, 160, 184, calc(var(--load) * 0.12)) 0%, transparent 40%);
  filter: blur(2px);
}

.loader__center { position: relative; text-align: center; }
.loader__kanji {
  font-size: clamp(2.6rem, 8vmin, 4.6rem);
  font-weight: 500;
  letter-spacing: 0.35em;
  text-indent: 0.35em;
  color: var(--ink);
  opacity: calc(0.35 + var(--load) * 0.65);
}
.loader__count {
  margin-top: 1.2rem;
  font-family: var(--mono);
  font-weight: 300;
  font-size: 0.9rem;
  letter-spacing: 0.2em;
  color: var(--ink-dim);
}
.loader__count small { font-size: 0.7em; margin-left: 0.15em; }

/* ═══════════ カスタムカーソル ═══════════ */
.cursor {
  position: fixed;
  left: 0;
  top: 0;
  z-index: 70;
  pointer-events: none;
  --charge: 0;
}
.cursor__dot {
  position: absolute;
  left: -3px;
  top: -3px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  transition: transform 0.2s ease;
}
.cursor__ring {
  position: absolute;
  left: -17px;
  top: -17px;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  border: 1px solid color-mix(in srgb, var(--accent) 55%, transparent);
  transition: transform 0.25s ease, opacity 0.25s ease;
}
.cursor__charge {
  position: absolute;
  left: -17px;
  top: -17px;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: radial-gradient(circle, color-mix(in srgb, var(--accent) 45%, transparent) 0%, transparent 65%);
  transform: scale(var(--charge));
  opacity: calc(var(--charge) * 0.9);
}
.cursor.is-hover .cursor__ring { transform: scale(1.5); opacity: 0.5; }
.cursor.is-down .cursor__ring { transform: scale(0.6); }
.cursor.is-charging .cursor__dot { transform: scale(1.6); }

/* ═══════════ ヘッダー ═══════════ */
.site-header {
  position: fixed;
  z-index: 20;
  top: 0;
  left: 0;
  right: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: clamp(1rem, 3vmin, 1.8rem) clamp(1.2rem, 4vmin, 2.6rem);
  opacity: 0;
  transition: opacity 1s ease 1.2s;
}
body.is-loaded .site-header { opacity: 1; }

.brand { display: inline-flex; align-items: center; gap: 0.6rem; color: var(--ink); }
.brand__mark { width: 26px; height: 26px; color: var(--accent); transition: color 1.2s ease; }
.brand__name {
  font-family: var(--mono);
  font-weight: 400;
  font-size: 0.95rem;
  letter-spacing: 0.42em;
}

.header__right { display: flex; align-items: center; gap: clamp(1rem, 3vw, 2rem); }
.counter {
  font-weight: 300;
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  color: var(--ink-dim);
}
.counter span { color: var(--ink); }
.share {
  font-weight: 400;
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  color: var(--ink-dim);
  text-decoration: none;
  transition: color 0.3s ease;
}
.share:hover { color: var(--accent); }

/* ═══════════ タイトル ═══════════ */
.stage {
  position: fixed;
  inset: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  pointer-events: none;
}
.intro {
  text-align: left;
  padding: 0 1.4rem 6vmin clamp(1.4rem, 7vw, 6.5rem);
  transition: opacity 1.6s ease, transform 1.6s ease;
}
body.is-played .intro { opacity: 0; transform: translateY(-2vmin); }

/* 常設キャプション（タイトル退場後も残る種明かしの一行） */
.stage-caption {
  position: absolute;
  left: 50%;
  bottom: clamp(5.4rem, 14vmin, 7.6rem);
  transform: translateX(-50%);
  font-weight: 300;
  font-size: clamp(0.6rem, 1.5vmin, 0.72rem);
  letter-spacing: 0.22em;
  color: rgba(242, 236, 236, 0.42);
  white-space: nowrap;
  opacity: 0;
  transition: opacity 1.4s ease 2.4s;
}
body.is-loaded .stage-caption { opacity: 1; }
.stage-caption { text-align: center; line-height: 2.1; }
.stage-caption__science {
  font-size: 0.88em;
  color: rgba(242, 236, 236, 0.30);
}

.lang-toggle {
  margin-left: 1.1em;
  padding: 0.1em 0.55em;
  border: 1px solid rgba(242, 236, 236, 0.22);
  border-radius: 999px;
  font-size: 0.92em;
  letter-spacing: 0.1em;
  color: rgba(242, 236, 236, 0.55) !important;
}
.lang-toggle:hover { color: var(--accent) !important; border-color: var(--accent); }

.intro__eyebrow {
  font-weight: 300;
  font-size: clamp(0.62rem, 1.6vmin, 0.78rem);
  letter-spacing: 0.34em;
  color: var(--ink-dim);
  margin-bottom: clamp(1.2rem, 3.5vmin, 2.2rem);
  opacity: 0;
  transition: opacity 1.2s ease 1.35s;
}
body.is-loaded .intro__eyebrow { opacity: 1; }

.intro__title {
  font-weight: 500;
  font-size: clamp(2.5rem, 10.5vmin, 7rem);
  line-height: 1.42;
  letter-spacing: 0.14em;
}
.intro__line { display: block; overflow: hidden; }
.intro__line--indent { padding-left: 1.6em; }
.intro__line-inner {
  display: inline-block;
  transform: translateY(110%);
  transition: transform 1.3s cubic-bezier(0.19, 1, 0.22, 1);
}
body.is-loaded .intro__line-inner { transform: translateY(0); }
.intro__line:nth-child(2) .intro__line-inner { transition-delay: 0.18s; }

.intro__hint {
  margin-top: clamp(1.6rem, 4.5vmin, 3rem);
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  justify-content: flex-start;
  opacity: 0;
  transition: opacity 1.2s ease 1.9s;
}
body.is-loaded .intro__hint { opacity: 1; }

.hint-chip {
  font-family: var(--sans);
  font-weight: 300;
  font-size: clamp(0.66rem, 1.7vmin, 0.78rem);
  letter-spacing: 0.1em;
  color: var(--ink);
  border: 1px solid rgba(242, 236, 236, 0.20);
  border-radius: 999px;
  padding: 0.38em 1em;
  background: rgba(11, 8, 19, 0.28);
  backdrop-filter: blur(4px);
}

/* ═══════════ 操作ドック ═══════════ */
.dock {
  position: fixed;
  z-index: 20;
  left: 50%;
  bottom: clamp(0.9rem, 3vmin, 1.8rem);
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: clamp(0.5rem, 1.6vw, 1.1rem);
  padding: 0.55rem clamp(0.7rem, 2vw, 1.2rem);
  border-radius: 999px;
  background: rgba(11, 8, 19, 0.55);
  border: 1px solid rgba(242, 236, 236, 0.1);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  opacity: 0;
  transition: opacity 1s ease 1.6s;
  max-width: calc(100vw - 1.2rem);
}
body.is-loaded .dock { opacity: 1; }

.dock__group { display: flex; align-items: center; gap: 0.18rem; }
.dock__label {
  font-weight: 300;
  font-size: 0.58rem;
  letter-spacing: 0.22em;
  color: var(--ink-dim);
  margin-right: 0.45rem;
  white-space: nowrap;
}
.dock__rule { width: 1px; height: 1.5rem; background: rgba(242, 236, 236, 0.12); }

.dock button {
  white-space: nowrap;
  font-family: var(--serif);
  font-weight: 500;
  font-size: clamp(0.72rem, 1.9vmin, 0.84rem);
  letter-spacing: 0.12em;
  color: var(--ink-dim);
  background: transparent;
  border: 1px solid transparent;
  border-radius: 999px;
  padding: 0.4em 0.85em;
  transition: color 0.3s ease, border-color 0.3s ease, background 0.3s ease;
}
.dock button:hover { color: var(--ink); }
.dock button.is-on {
  color: var(--ink);
  border-color: color-mix(in srgb, var(--accent) 55%, transparent);
  background: color-mix(in srgb, var(--accent) 12%, transparent);
}

/* ═══════════ フッター ═══════════ */
.site-footer {
  position: fixed;
  z-index: 20;
  left: 0;
  right: 0;
  bottom: 0;
  display: flex;
  justify-content: space-between;
  padding: 0.9rem clamp(1.2rem, 4vmin, 2.6rem);
  font-weight: 300;
  font-size: 0.62rem;
  letter-spacing: 0.16em;
  color: rgba(242, 236, 236, 0.34);
  pointer-events: none;
  opacity: 0;
  transition: opacity 1s ease 2s;
}
body.is-loaded .site-footer { opacity: 1; }
.site-footer a {
  color: rgba(242, 236, 236, 0.5);
  text-decoration: none;
  pointer-events: auto;
  transition: color 0.3s ease;
}
.site-footer a:hover { color: var(--accent); }

/* ═══════════ レスポンシブ ═══════════ */
@media (max-width: 760px) {
  .dock {
    flex-wrap: wrap;
    justify-content: center;
    border-radius: 20px;
    row-gap: 0.3rem;
    bottom: 2.4rem;
  }
  .dock__rule { display: none; }
  .dock__label { display: none; }
  .stage-caption { white-space: normal; max-width: 84vw; text-align: center; bottom: clamp(12rem, 32vmin, 15rem); line-height: 1.8; }
  .stage-caption__science { display: none; }
  /* スマホではタイトル退場後にだけキャプションを出す（重なり防止） */
  body:not(.is-played) .stage-caption { opacity: 0; }
  .site-footer { justify-content: center; gap: 1.2em; font-size: 0.56rem; padding-bottom: 0.55rem; }
  .site-footer__mission { display: none; }
  .counter { display: none; }
  .intro__line--indent { padding-left: 1em; }
}

/* ═══════════ reduced motion ═══════════ */
@media (prefers-reduced-motion: reduce) {
  .grain { animation: none; }
  .intro__line-inner, .intro__eyebrow, .intro__hint, .dock, .site-header, .site-footer {
    transition: none;
  }
}