/* ============================================================
   1st Anniversary — Vertical Timeline Album (mosaic edition)
   ============================================================ */

:root {
  --bg: #f6f0e7;
  --bg-soft: #ece1d2;
  --bg-deep: #e3d4c0;
  --white: #fffdf9;
  --text: #3a322a;
  --text-soft: #8a7d6d;
  --accent: #b08d6a;       /* rose gold */
  --accent-2: #c98a7a;     /* dusty rose */
  --accent-3: #9aa67e;     /* sage */
  --accent-light: #d8c7b2;
  --radius: 12px;
  --shadow: 0 8px 28px rgba(90, 70, 50, 0.14);
  --shadow-soft: 0 3px 12px rgba(90, 70, 50, 0.08);
}

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

html { scroll-behavior: smooth; }

body {
  --season-bg-1: #f7f1e6;
  --season-bg-2: #f3ead8;
  font-family: 'Noto Serif JP', serif;
  font-weight: 300;
  color: var(--text);
  /* 季節でゆっくり変わる背景(JSが --season-bg-* を更新) */
  background-color: var(--season-bg-1);
  background-image:
    linear-gradient(180deg, var(--season-bg-1), var(--season-bg-2)),
    radial-gradient(circle at 12% 8%, rgba(201, 138, 122, 0.08), transparent 38%),
    radial-gradient(circle at 88% 22%, rgba(154, 166, 126, 0.08), transparent 42%);
  background-attachment: fixed;
  transition: background-color 1.2s ease;
  -webkit-font-smoothing: antialiased;
  line-height: 1.7;
}

img { display: block; max-width: 100%; }

/* ---------- Hero ---------- */
.hero {
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 2rem;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 50% 35%, var(--white) 0%, transparent 60%);
  opacity: 0.7;
  pointer-events: none;
}
.hero__inner { position: relative; animation: heroRise 1.4s ease both; }
@keyframes heroRise {
  from { opacity: 0; transform: translateY(26px); }
  to { opacity: 1; transform: none; }
}

.hero__eyebrow {
  font-family: 'Cormorant Garamond', serif;
  font-style: italic;
  font-size: clamp(1rem, 3.5vw, 1.4rem);
  letter-spacing: 0.18em;
  color: var(--accent-2);
  margin-bottom: 1.2rem;
}

.hero__title {
  font-family: 'Cormorant Garamond', serif;
  font-weight: 500;
  font-size: clamp(2.8rem, 13vw, 6rem);
  letter-spacing: 0.04em;
  line-height: 1.05;
  background: linear-gradient(120deg, var(--accent) 0%, var(--accent-2) 50%, var(--accent) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero__rule {
  width: 100%;
  max-width: 240px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.7rem;
  margin: 1.6rem 0;
  color: var(--accent);
}
.hero__rule span {
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent-light), transparent);
}
.hero__rule::after {
  content: '❧';
  font-size: 1.1rem;
  color: var(--accent-2);
  order: 0;
}

.hero__lead {
  font-size: clamp(0.95rem, 3.6vw, 1.15rem);
  color: var(--text-soft);
  letter-spacing: 0.05em;
}

.hero__scroll {
  position: absolute;
  bottom: 2rem;
  font-family: 'Cormorant Garamond', serif;
  font-style: italic;
  font-size: 0.95rem;
  letter-spacing: 0.15em;
  color: var(--text-soft);
  animation: float 2.4s ease-in-out infinite;
}
@keyframes float {
  0%, 100% { transform: translateY(0); opacity: 0.7; }
  50% { transform: translateY(8px); opacity: 1; }
}

/* ---------- Timeline ---------- */
.timeline {
  max-width: 1180px;
  margin: 0 auto;
  padding: 2rem 1.5rem 2rem;
  /* 左に時間軸を通すための余白 */
  padding-left: 3.2rem;
  position: relative;
}

.loading {
  text-align: center;
  color: var(--text-soft);
  padding: 4rem 0;
}

/* 季節カラー(各シーズンのアクセント) */
.season-summer { --s: #c98a7a; }
.season-autumn { --s: #c4894f; }
.season-winter { --s: #6f8a93; }
.season-spring { --s: #c585a0; }
.season-etc    { --s: #a99176; }

/* ---------- Season divider(季節の章見出し) ---------- */
.season-divider {
  position: relative;
  text-align: center;
  margin: 1rem 0 3rem;
  padding: 2.5rem 0 1.5rem;
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.9s ease, transform 0.9s ease;
}
.season-divider.is-visible { opacity: 1; transform: none; }
.season-divider__icon {
  display: block;
  font-size: 1.8rem;
  margin-bottom: 0.3rem;
  filter: saturate(0.85);
}
.season-divider__label {
  font-family: 'Cormorant Garamond', serif;
  font-style: italic;
  font-size: clamp(1.8rem, 7vw, 3rem);
  letter-spacing: 0.08em;
  color: var(--s, var(--accent));
  line-height: 1.1;
}
.season-divider__sub {
  font-family: 'Cormorant Garamond', serif;
  font-size: 0.95rem;
  letter-spacing: 0.2em;
  color: var(--text-soft);
  margin-top: 0.2rem;
}

/* ---------- Event(時間軸付き) ---------- */
.event {
  position: relative;
  margin-bottom: 5.5rem;
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.9s ease, transform 0.9s ease;
}
.event.is-visible { opacity: 1; transform: none; }

/* 左の時間軸: ドット + 下に伸びる縦線 */
.event__axis {
  position: absolute;
  left: -2.1rem;
  top: 2.6rem;
  bottom: -5.5rem;
  width: 2px;
  display: flex;
  justify-content: center;
}
.event__line {
  width: 2px;
  height: 100%;
  background: linear-gradient(180deg, var(--s, var(--accent-light)), var(--accent-light) 40%, transparent);
  opacity: 0.5;
}
.event__dot {
  position: absolute;
  top: 0;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--season-bg-1, #fff);
  border: 2px solid var(--s, var(--accent));
  box-shadow: 0 0 0 4px var(--season-bg-1, #fff);
  transition: transform 0.4s ease, background 0.4s ease;
}
.event.is-visible .event__dot {
  background: var(--s, var(--accent));
  transform: scale(1.1);
}
@media (max-width: 600px) {
  .event__axis { left: -1.4rem; }
}

/* event header with big decorative number */
.event__head {
  position: relative;
  text-align: center;
  margin-bottom: 2rem;
  padding-top: 2.4rem;
}
.event__num {
  position: absolute;
  top: -0.6rem;
  left: 50%;
  transform: translateX(-50%);
  font-family: 'Cormorant Garamond', serif;
  font-style: italic;
  font-size: clamp(4rem, 16vw, 7rem);
  line-height: 1;
  color: var(--s, var(--accent));
  opacity: 0.14;
  pointer-events: none;
  user-select: none;
  z-index: 0;
}
.event__date {
  position: relative;
  z-index: 1;
  font-family: 'Cormorant Garamond', serif;
  font-style: italic;
  font-size: 1.1rem;
  letter-spacing: 0.12em;
  color: var(--accent-2);
}
.event__title {
  position: relative;
  z-index: 1;
  font-weight: 600;
  font-size: clamp(1.3rem, 5vw, 1.9rem);
  letter-spacing: 0.03em;
  margin: 0.3rem 0 0.5rem;
  color: var(--text);
}
.event__count {
  position: relative;
  z-index: 1;
  font-family: 'Cormorant Garamond', serif;
  font-style: italic;
  font-size: 0.85rem;
  color: var(--text-soft);
}
.event__rule {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  margin: 0.9rem auto 0;
  width: 120px;
  color: var(--accent-2);
  font-size: 0.7rem;
}
.event__rule::before,
.event__rule::after {
  content: '';
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent-light), transparent);
}
.event__rule::after { content: '◆'; flex: 0; color: var(--accent-2); }
/* small diamond in the middle */
.event__rule span { display: none; }

/* ---------- Mosaic Grid ---------- */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(210px, 1fr));
  grid-auto-rows: 8px;        /* base row unit; JS sets span per cell */
  gap: 10px;
}

.cell {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius);
  background: var(--bg-soft);
  cursor: pointer;
  box-shadow: var(--shadow-soft);
  grid-row-end: span 30;      /* fallback before JS runs */
  transition: box-shadow 0.35s ease, transform 0.35s ease;
}
.cell::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 60%, rgba(40, 30, 20, 0.18));
  opacity: 0;
  transition: opacity 0.4s ease;
}
.cell:hover { box-shadow: var(--shadow); transform: translateY(-3px); }
.cell:hover::after { opacity: 1; }

.cell img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s ease, opacity 0.6s ease;
  opacity: 0;
}
.cell img.is-loaded { opacity: 1; }
.cell:hover img { transform: scale(1.07); }

/* occasional feature cells get a warm ring */
.cell.is-feature { box-shadow: 0 0 0 3px var(--white), var(--shadow); }

/* ---------- Closing ---------- */
.closing {
  text-align: center;
  padding: 5rem 2rem 6rem;
  background: linear-gradient(180deg, transparent 0%, var(--bg-soft) 60%, var(--bg-deep) 100%);
}
.closing__script {
  font-family: 'Cormorant Garamond', serif;
  font-style: italic;
  font-size: clamp(1.8rem, 7vw, 2.8rem);
  background: linear-gradient(120deg, var(--accent-2), var(--accent));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  margin-bottom: 0.6rem;
}
.closing__text {
  font-size: 1rem;
  letter-spacing: 0.08em;
  color: var(--text-soft);
}

/* ---------- Lightbox ---------- */
.lb {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(28, 22, 16, 0.94);
  backdrop-filter: blur(4px);
}
.lb[hidden] { display: none; }

.lb__stage {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  max-width: 92vw;
  max-height: 84vh;
}

.lb__img {
  max-width: 92vw;
  max-height: 84vh;
  border-radius: 6px;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
  opacity: 0;
  transition: opacity 0.3s ease;
}
.lb__img.is-shown { opacity: 1; }

.lb__spinner {
  position: absolute;
  width: 40px;
  height: 40px;
  border: 3px solid rgba(255, 255, 255, 0.25);
  border-top-color: rgba(255, 255, 255, 0.9);
  border-radius: 50%;
  opacity: 0;
  animation: spin 0.8s linear infinite;
}
.lb__stage.is-loading .lb__spinner { opacity: 1; }
@keyframes spin { to { transform: rotate(360deg); } }

.lb__close,
.lb__nav {
  position: absolute;
  background: rgba(255, 255, 255, 0.1);
  border: none;
  color: #fff;
  cursor: pointer;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s;
  z-index: 2;
}
.lb__close:hover,
.lb__nav:hover { background: rgba(255, 255, 255, 0.25); }

.lb__close {
  top: calc(1rem + env(safe-area-inset-top, 0px));
  right: 1rem;
  width: 44px;
  height: 44px;
  font-size: 1.6rem;
  line-height: 1;
}

.lb__nav {
  top: 50%;
  transform: translateY(-50%);
  width: 50px;
  height: 50px;
  font-size: 2rem;
  line-height: 1;
}
.lb__prev { left: 1rem; }
.lb__next { right: 1rem; }

.lb__counter {
  position: absolute;
  top: calc(1.4rem + env(safe-area-inset-top, 0px));
  left: 50%;
  transform: translateX(-50%);
  color: rgba(255, 255, 255, 0.8);
  font-family: 'Cormorant Garamond', serif;
  font-style: italic;
  font-size: 0.95rem;
  letter-spacing: 0.08em;
}

.lb__caption {
  position: absolute;
  bottom: calc(1.4rem + env(safe-area-inset-bottom, 0px));
  left: 50%;
  transform: translateX(-50%);
  width: 90%;
  text-align: center;
  color: rgba(255, 255, 255, 0.85);
  font-size: 0.9rem;
  letter-spacing: 0.04em;
}

/* ---------- Month navigation(右端の縦ナビ) ---------- */
.monthnav {
  position: fixed;
  right: max(0.6rem, env(safe-area-inset-right, 0px));
  top: 50%;
  transform: translateY(-50%);
  z-index: 500;
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  padding: 0.5rem 0.3rem;
  max-height: 80vh;
  overflow: hidden;
}
.mn__item {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 0.5rem;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.18rem 0.2rem;
  color: var(--text-soft);
  font-family: 'Cormorant Garamond', serif;
  font-size: 0.78rem;
  letter-spacing: 0.05em;
  transition: color 0.3s ease;
}
.mn__label {
  opacity: 0;
  transform: translateX(6px);
  transition: opacity 0.3s ease, transform 0.3s ease;
  white-space: nowrap;
  line-height: 1;
}
.mn__label em { font-style: italic; opacity: 0.7; }
.mn__dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent-light);
  flex: none;
  transition: transform 0.3s ease, background 0.3s ease;
}
/* ホバー or アクティブでラベル表示 */
.monthnav:hover .mn__label { opacity: 1; transform: none; }
.mn__item:hover { color: var(--s, var(--accent)); }
.mn__item:hover .mn__dot { background: var(--s, var(--accent)); transform: scale(1.3); }
.mn__item.is-active { color: var(--s, var(--accent)); }
.mn__item.is-active .mn__label { opacity: 1; transform: none; font-weight: 600; }
.mn__item.is-active .mn__dot {
  background: var(--s, var(--accent));
  transform: scale(1.7);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--s, var(--accent)) 22%, transparent);
}

/* ---------- Responsive ---------- */
@media (max-width: 600px) {
  .timeline { padding: 2rem 0.8rem 1rem; padding-left: 1.8rem; }
  .event { margin-bottom: 4rem; }
  .grid { grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); gap: 6px; }
  .lb__prev { left: 0.4rem; }
  .lb__next { right: 0.4rem; }
  .lb__nav { width: 42px; height: 42px; font-size: 1.7rem; }
  /* スマホは月ナビをドットのみ・細く */
  .monthnav { gap: 0.05rem; padding: 0.3rem 0.15rem; }
  .mn__label { display: none; }
  .mn__item.is-active .mn__label { display: none; }
  .mn__dot { width: 5px; height: 5px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
}