/* studio aila — 一日の空 = スタジオの歩み（古い順）
   夜明け(hero) → 朝焼け(after grow 2018) → 夏の昼(あまつそらに咲く 2024) → 夕暮れ〜夜(VIRTUAL ENCORE 2027) → 深夜(about / contact) */

:root {
  /* 空 */
  --dawn-top: #c9cde4;
  --dawn-low: #f5dccd;
  --day-high: #7fbfe8;
  --day-low: #cfe9f6;
  --morning-glow: #f6c49e;
  --morning-rose: #eeb1a0;
  --dusk-glow: #f4c095;
  --dusk-sun: #e3876a;
  --dusk-end: #5e4d84;
  --night: #1d1a40;
  --night-deep: #0b0d24;
  --late: #05060f;

  /* インク */
  --ink: #1e2230;
  --ink-soft: #4a5063;
  --ink-dusk: #2b1b26;
  --paper: #f1f2f8;
  --paper-soft: #b9bdd3;
  --stamp: #ff7d2e;
  --moon: #f6f0d8;

  --f-hand: "Klee One", "Hiragino Mincho ProN", serif;
  --f-body: "Zen Kaku Gothic New", "Hiragino Sans", "Yu Gothic", sans-serif;
  --f-latin: "Saira Condensed", "Zen Kaku Gothic New", sans-serif;
  --f-stamp: "Share Tech Mono", ui-monospace, monospace;

  --gutter: clamp(16px, 5vw, 64px);
  --max: 1200px;
  --ease: cubic-bezier(.2, .7, .2, 1);
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--late);
  color: var(--ink);
  font-family: var(--f-body);
  font-size: 15px;
  line-height: 1.9;
  letter-spacing: .04em;
  font-feature-settings: "palt";
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; }
:focus-visible { outline: 2px solid var(--stamp); outline-offset: 3px; border-radius: 2px; }

.skip {
  position: absolute; left: 12px; top: -60px; z-index: 100;
  background: var(--ink); color: var(--paper); padding: 8px 14px; text-decoration: none;
}
.skip:focus { top: 12px; }

.eyebrow {
  display: block;
  font-family: var(--f-latin);
  font-weight: 500;
  font-size: 13px;
  letter-spacing: .32em;
  text-transform: uppercase;
  margin: 0 0 .6em;
  opacity: .75;
}

/* ---------- header ---------- */
.site-header {
  position: fixed; inset: 0 0 auto 0; z-index: 50;
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding: 14px var(--gutter);
  color: var(--ink);
  transition: color .5s var(--ease), background-color .5s var(--ease);
}
.site-header.is-scrolled { background: rgba(244, 238, 240, .72); }
.site-header.is-scrolled[data-tone="light"] { background: rgba(10, 12, 32, .62); }
@media (hover: hover) and (pointer: fine) {
  .site-header.is-scrolled { background: color-mix(in srgb, currentColor 6%, transparent); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px); }
  .site-header.is-scrolled[data-tone="light"] { background: rgba(10, 12, 32, .35); }
}
.site-header[data-tone="light"] { color: var(--paper); }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; }
.brand-mark {
  width: 46px; height: 25px;
  background: currentColor;
  -webkit-mask: url(../img/logo_mark.png) center / contain no-repeat;
          mask: url(../img/logo_mark.png) center / contain no-repeat;
}
.brand-name { font-family: var(--f-latin); font-size: 22px; font-weight: 500; letter-spacing: .06em; line-height: 1; }
.site-nav { display: flex; gap: clamp(14px, 2.6vw, 32px); }
.site-nav a {
  font-family: var(--f-latin); font-size: 15px; letter-spacing: .18em; text-transform: uppercase;
  text-decoration: none; position: relative; padding: 4px 0;
}
.site-nav a::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: 0; height: 1px;
  background: currentColor; transform: scaleX(0); transform-origin: left; transition: transform .35s var(--ease);
}
.site-nav a:hover::after, .site-nav a:focus-visible::after { transform: scaleX(1); }

/* ---------- 空 ---------- */
.sky { position: relative; overflow: hidden; }
.sky--dawn  { background: linear-gradient(180deg, var(--dawn-top) 0%, #dcd6e6 45%, var(--dawn-low) 100%); }
.sky--morning { background: linear-gradient(180deg, var(--dawn-low) 0%, var(--morning-rose) 28%, var(--morning-glow) 58%, #f3e1cc 82%, var(--day-low) 100%); }
.sky--day   { background: linear-gradient(180deg, var(--day-low) 0%, var(--day-high) 40%, var(--day-low) 74%, var(--dusk-glow) 90%, var(--dusk-sun) 100%); }
.sky--night { background: linear-gradient(180deg, var(--dusk-sun) 0%, var(--dusk-end) 16%, var(--night) 38%, var(--night-deep) 100%); color: var(--paper); }
.sky--late  { background: linear-gradient(180deg, var(--night-deep) 0%, #080a1c 100%); color: var(--paper); }
.sky--deep  { background: linear-gradient(180deg, #080a1c 0%, var(--late) 100%); color: var(--paper); }

.stars {
  position: absolute; inset: 0; pointer-events: none;
  background-image:
    radial-gradient(1.4px 1.4px at 12% 18%, #fff 50%, transparent 51%),
    radial-gradient(1px 1px at 27% 42%, #fff 50%, transparent 51%),
    radial-gradient(1.6px 1.6px at 44% 9%, #fff 50%, transparent 51%),
    radial-gradient(1px 1px at 63% 31%, #fff 50%, transparent 51%),
    radial-gradient(1.2px 1.2px at 81% 14%, #fff 50%, transparent 51%),
    radial-gradient(1px 1px at 92% 47%, #fff 50%, transparent 51%),
    radial-gradient(1.2px 1.2px at 7% 66%, #fff 50%, transparent 51%),
    radial-gradient(1px 1px at 55% 72%, #fff 50%, transparent 51%),
    radial-gradient(1.4px 1.4px at 74% 86%, #fff 50%, transparent 51%),
    radial-gradient(1px 1px at 34% 91%, #fff 50%, transparent 51%);
  background-size: 520px 520px;
  opacity: 0;
  mask-image: linear-gradient(180deg, transparent 0%, #000 30%);
  -webkit-mask-image: linear-gradient(180deg, transparent 0%, #000 30%);
}
.sky--night .stars { opacity: .55; }
.stars--dim { opacity: .35; mask-image: none; -webkit-mask-image: none; }

/* ---------- 光：スクロール位置＝時刻（main.js が位置と色を更新）
   太陽や月を「描く」のではなく、フィルムに入り込む光漏れ・ハレーションとして見せる ---------- */
.celestial { position: fixed; inset: 0; z-index: 1; pointer-events: none; overflow: hidden; }
.leak {
  position: absolute; left: 0; top: 0;
  width: 120vmax; height: 120vmax; margin: -60vmax 0 0 -60vmax;
  border-radius: 50%;
  will-change: transform, opacity;
}
.leak--sun {
  background: radial-gradient(circle,
    rgb(var(--sun, 255 236 205) / .95) 0,
    rgb(var(--sun, 255 236 205) / .55) 4%,
    rgb(var(--sun, 255 236 205) / .22) 14%,
    rgb(var(--burn, 255 150 110) / .12) 28%,
    transparent 52%);
  transform: translate(50vw, 86vh);
}
.leak--moon {
  background: radial-gradient(circle,
    rgb(214 224 255 / .32) 0,
    rgb(190 204 255 / .14) 6%,
    rgb(150 160 240 / .07) 20%,
    transparent 44%);
  opacity: 0;
}

/* 本文は光より手前、雲は光より手前・本文より奥 */
.hero-inner, .sea, .work-grid, .about-inner, .contact-inner { position: relative; z-index: 2; }

/* ---------- 雲：ページ全体に一枚。色と濃さは時刻に合わせて縦方向に連続して変わる
   --s1〜--s4 は各セクションの上端（px）。main.js が実寸を入れる ---------- */
main { position: relative; }
.sky-clouds {
  --s1: 12%; --s2: 30%; --s3: 55%; --s4: 75%;
  position: absolute; inset: 0; z-index: 1; pointer-events: none; overflow: hidden;
}
/* 雲の模様1枚分（2000px）だけ左に広げておき、その分を横に流してループさせる */
.sky-clouds-layer {
  position: absolute; top: 0; bottom: 0; left: -2000px; width: calc(100% + 2000px);
  background: linear-gradient(180deg,
    #f7ddd6 0,
    #f8d2c0 calc(var(--s1) * .85),
    #f6bfa6 var(--s1),
    #f9d3bd calc(var(--s1) + (var(--s2) - var(--s1)) * .6),
    #fdf1e8 var(--s2),
    #ffffff calc(var(--s2) + (var(--s3) - var(--s2)) * .2),
    #ffffff calc(var(--s2) + (var(--s3) - var(--s2)) * .6),
    #ffd8bf calc(var(--s3) - (var(--s3) - var(--s2)) * .12),
    #f29c7c var(--s3),
    #9a7fae calc(var(--s3) + (var(--s4) - var(--s3)) * .25),
    #4a4878 calc(var(--s3) + (var(--s4) - var(--s3)) * .6),
    #2c2d52 var(--s4),
    #1b1c38 100%);
  -webkit-mask-image: url(../img/clouds.webp), linear-gradient(180deg,
    rgba(0,0,0,.18) 0,
    rgba(0,0,0,.4) var(--s1),
    rgba(0,0,0,.6) calc(var(--s1) + (var(--s2) - var(--s1)) * .7),
    rgba(0,0,0,.85) calc(var(--s2) + (var(--s3) - var(--s2)) * .15),
    rgba(0,0,0,.5) calc(var(--s2) + (var(--s3) - var(--s2)) * .55),
    rgba(0,0,0,.8) var(--s3),
    rgba(0,0,0,.45) calc(var(--s3) + (var(--s4) - var(--s3)) * .5),
    rgba(0,0,0,.22) var(--s4),
    rgba(0,0,0,.1) 100%);
          mask-image: url(../img/clouds.webp), linear-gradient(180deg,
    rgba(0,0,0,.18) 0,
    rgba(0,0,0,.4) var(--s1),
    rgba(0,0,0,.6) calc(var(--s1) + (var(--s2) - var(--s1)) * .7),
    rgba(0,0,0,.85) calc(var(--s2) + (var(--s3) - var(--s2)) * .15),
    rgba(0,0,0,.5) calc(var(--s2) + (var(--s3) - var(--s2)) * .55),
    rgba(0,0,0,.8) var(--s3),
    rgba(0,0,0,.45) calc(var(--s3) + (var(--s4) - var(--s3)) * .5),
    rgba(0,0,0,.22) var(--s4),
    rgba(0,0,0,.1) 100%);
  -webkit-mask-size: 2000px 900px, 100% 100%;
          mask-size: 2000px 900px, 100% 100%;
  -webkit-mask-repeat: repeat, no-repeat;
          mask-repeat: repeat, no-repeat;
  -webkit-mask-composite: source-in;
          mask-composite: intersect;
}
@keyframes cloud-slide { from { transform: translateX(0); } to { transform: translateX(2000px); } }
@media (hover: hover) and (pointer: fine) {
  .sky-clouds-layer { will-change: transform; animation: cloud-slide 260s linear infinite; }
}

/* ---------- 星のまたたき ---------- */
.stars::after {
  content: ""; position: absolute; inset: 0;
  background-image:
    radial-gradient(1.6px 1.6px at 18% 28%, #fff 50%, transparent 51%),
    radial-gradient(1.2px 1.2px at 39% 63%, #fff 50%, transparent 51%),
    radial-gradient(1.8px 1.8px at 71% 22%, #fff 50%, transparent 51%),
    radial-gradient(1.2px 1.2px at 86% 71%, #fff 50%, transparent 51%),
    radial-gradient(1.4px 1.4px at 58% 88%, #fff 50%, transparent 51%);
  background-size: 380px 380px;
  animation: twinkle 3.2s ease-in-out infinite alternate;
}
@keyframes twinkle { from { opacity: .1; } to { opacity: 1; } }

/* ---------- フィルム：粒子と周辺減光（ページ全体に一枚かける） ---------- */
.film { position: fixed; inset: 0; z-index: 45; pointer-events: none; }
.film::before {
  content: ""; position: absolute; inset: -60px;
  background: url(../img/grain.png) 0 0 / 200px 200px;
  opacity: .55;
}
@media (hover: hover) and (pointer: fine) {
  .film::before { will-change: transform; animation: grain .9s steps(6) infinite; }
}
.film::after {
  content: ""; position: absolute; inset: 0;
  background: radial-gradient(ellipse 120% 100% at 50% 45%, transparent 55%, rgba(40, 18, 30, .2) 100%);
}
@keyframes grain {
  0% { transform: translate(0, 0); } 17% { transform: translate(-22px, 14px); }
  33% { transform: translate(18px, -26px); } 50% { transform: translate(-30px, -8px); }
  67% { transform: translate(26px, 22px); } 83% { transform: translate(-10px, 30px); }
  100% { transform: translate(0, 0); }
}

/* ---------- hero（夜明け） ---------- */
.hero { min-height: 100svh; display: flex; flex-direction: column; }
.hero-inner {
  flex: 1;
  width: min(100% - var(--gutter) * 2, var(--max));
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: clamp(24px, 6vw, 96px);
  padding: 120px 0 40px;
}
.hero-brand .eyebrow { margin-left: .3em; }
.hero-logo { margin: 0; width: min(440px, 100%); }
.hero-logo img { filter: drop-shadow(0 1px 0 rgba(255,255,255,.35)); }
.hero-letter {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  font-feature-settings: normal;   /* 横組み用の palt を外す（縦組みで字の中心がずれるため） */
  margin: 0;
  font-family: var(--f-hand);
  font-weight: 600;
  font-size: clamp(22px, 2.6vw, 34px);
  line-height: 2.1;
  letter-spacing: .14em;
  height: min(30em, 62svh);
  color: var(--ink);
}
.hero-letter span { display: block; }
.hero-letter .hero-letter-sub {
  font-weight: 400;
  font-size: .56em;
  color: var(--ink-soft);
  letter-spacing: .2em;
  padding-top: 3.2em;
}
.hero-letter span:nth-child(4) { margin-right: 1.4em; }

/* 波（ロゴの三本線） */
.sea { position: relative; height: 96px; color: var(--ink); }
.wave {
  position: absolute; left: -120px; right: -120px; height: 14px;
  background: currentColor;
  -webkit-mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='60' height='14' viewBox='0 0 60 14'%3E%3Cpath d='M0 7 Q15 -1 30 7 T60 7' fill='none' stroke='%23000' stroke-width='3' stroke-linecap='round'/%3E%3C/svg%3E") left center / 60px 14px repeat-x;
          mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='60' height='14' viewBox='0 0 60 14'%3E%3Cpath d='M0 7 Q15 -1 30 7 T60 7' fill='none' stroke='%23000' stroke-width='3' stroke-linecap='round'/%3E%3C/svg%3E") left center / 60px 14px repeat-x;
  animation: drift 9s linear infinite;
}
.wave--1 { top: 8px; opacity: .55; }
.wave--2 { top: 40px; left: 6%; right: 6%; opacity: .35; animation-duration: 13s; animation-direction: reverse; }
.wave--3 { top: 70px; left: 16%; right: 16%; opacity: .2; animation-duration: 17s; }
@keyframes drift { to { transform: translateX(60px); } }

/* ---------- works ---------- */
.works-anchor { position: relative; top: -40px; }
.work { padding: clamp(64px, 9vw, 120px) 0; }
.work-grid {
  position: relative;
  width: min(100% - var(--gutter) * 2, var(--max));
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  column-gap: clamp(16px, 3vw, 40px);
  row-gap: 40px;
  align-items: center;
}
.work-visual { grid-column: 1 / span 7; margin: 0; position: relative; }
.work-visual img { width: 100%; box-shadow: 0 30px 60px -30px rgba(20, 30, 60, .45); }
.work-body { grid-column: 8 / span 5; }
.work--flip .work-visual { grid-column: 6 / span 7; grid-row: 1; }
.work--flip .work-body { grid-column: 1 / span 5; grid-row: 1; }
/* 夜 */
.work--night .work-visual { grid-column: 1 / span 6; }
.work--night .work-body { grid-column: 8 / span 5; }

/* 公式サイトのOGP画像をリンクカードとして表示（自サーバーには置かない） */
.linkcard-link {
  display: block; text-decoration: none; color: var(--paper);
  border: 1px solid rgba(255, 255, 255, .16); border-radius: 10px; overflow: hidden;
  background: rgba(255, 255, 255, .04);
  box-shadow: 0 30px 60px -30px rgba(0, 0, 0, .6);
  transition: transform .3s var(--ease), border-color .3s var(--ease);
}
.linkcard-link:hover { transform: translateY(-2px); border-color: rgba(255, 255, 255, .34); }
.linkcard-media {
  position: relative; display: block; aspect-ratio: 16 / 9;
  background: radial-gradient(circle at 70% 40%, #3a2f6e 0%, var(--night-deep) 70%);
}
.linkcard-media img { width: 100%; height: 100%; object-fit: cover; box-shadow: none; }
.linkcard-meta { display: grid; gap: 2px; padding: 12px 16px 13px; border-top: 1px solid rgba(255, 255, 255, .1); }
.linkcard-domain { font-family: var(--f-latin); font-size: 12px; letter-spacing: .14em; color: var(--paper-soft); }
.linkcard-title { font-size: 14px; font-weight: 500; letter-spacing: .06em; }
.linkcard-credit { margin-top: 8px; font-size: 11px; letter-spacing: .1em; color: var(--paper-soft); text-align: right; }

/* 撮影日スタンプ = 発売・頒布年月 */
.stamp {
  position: absolute; right: 14px; bottom: 10px;
  font-family: var(--f-stamp);
  font-size: clamp(15px, 1.6vw, 20px);
  letter-spacing: .12em;
  color: var(--stamp);
  text-shadow:
    -1px 0 0 rgba(255, 30, 60, .55),
    1px 0 0 rgba(0, 210, 255, .35),
    0 0 7px rgba(255, 110, 30, .8),
    0 0 1px rgba(255, 200, 150, .9);
  pointer-events: none;
}

.work-label {
  display: flex; align-items: center; gap: 12px; flex-wrap: wrap;
  margin: 0 0 18px;
  font-family: var(--f-latin); font-size: 14px; letter-spacing: .2em;
}
.chip {
  font-family: var(--f-body); font-size: 12px; font-weight: 700; letter-spacing: .12em;
  padding: 3px 10px 2px; border: 1px solid currentColor; border-radius: 999px; line-height: 1.6;
}
.work-title { margin: 0 0 22px; }
.work-title img { width: min(360px, 100%); }
.sky--day .work-title img { filter: drop-shadow(0 0 1px #2a5aa0) drop-shadow(0 0 1px #2a5aa0) drop-shadow(0 4px 10px rgba(20, 60, 120, .3)); }
.work-title--type {
  font-family: var(--f-latin); font-weight: 400; font-size: clamp(48px, 6vw, 76px);
  letter-spacing: .04em; line-height: 1; color: var(--ink-dusk);
}
.work-title--night {
  font-family: var(--f-latin); font-weight: 400; font-size: clamp(44px, 5.4vw, 68px);
  letter-spacing: .08em; line-height: 1; color: var(--moon);
}
.work-title--night span { display: block; margin-top: 14px; font-family: var(--f-body); font-size: 12px; letter-spacing: .5em; color: var(--paper-soft); }
.work-catch {
  font-family: var(--f-hand); font-weight: 600;
  font-size: clamp(17px, 1.7vw, 20px);
  line-height: 1.9; margin: 0 0 16px;
}
.work-text { margin: 0 0 22px; color: var(--ink-soft); }
.sky--morning .work-text { color: var(--ink-dusk); }
.sky--night .work-text { color: var(--paper-soft); }

.work-meta { margin: 0 0 26px; font-size: 13px; line-height: 1.7; }
.work-meta div { display: grid; grid-template-columns: 6.5em 1fr; gap: 8px; padding: 7px 0; border-top: 1px solid color-mix(in srgb, currentColor 22%, transparent); }
.work-meta div:last-child { border-bottom: 1px solid color-mix(in srgb, currentColor 22%, transparent); }
.work-meta dt { opacity: .7; }
.work-meta dd { margin: 0; }
.work-credit { margin: 18px 0 0; font-size: 12px; opacity: .6; letter-spacing: .06em; }

.work-links { display: flex; flex-wrap: wrap; gap: 12px; margin: 0; }
.btn {
  display: inline-flex; align-items: center; gap: .6em;
  padding: 11px 22px 10px;
  font-family: var(--f-body); font-size: 14px; font-weight: 500; letter-spacing: .1em;
  text-decoration: none; border-radius: 999px;
  background: var(--ink); color: var(--paper); border: 1px solid var(--ink);
  transition: transform .25s var(--ease), background-color .25s var(--ease), color .25s var(--ease);
}
.btn::after { content: "→"; font-family: var(--f-latin); transition: transform .25s var(--ease); }
.btn:hover { transform: translateY(-1px); }
.btn:hover::after { transform: translateX(3px); }
.btn--ghost { background: transparent; color: var(--ink); }
.btn--ghost:hover { background: color-mix(in srgb, var(--ink) 8%, transparent); }
.sky--night .btn { background: var(--paper); color: var(--night-deep); border-color: var(--paper); }
.sky--night .btn--ghost { background: transparent; color: var(--paper); }
.sky--night .btn--ghost:hover { background: rgba(255,255,255,.08); }

/* ゲーム内スチル：本文の中、ボタンの上に横2枚 */
.work-strip { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin: 0 0 26px; }
.work-strip img { width: 100%; box-shadow: 0 14px 28px -18px rgba(20, 30, 60, .45); }

/* ---------- about / contact（深夜） ---------- */
.about, .contact { padding: clamp(80px, 11vw, 140px) 0; }
.about-inner, .contact-inner { position: relative; width: min(100% - var(--gutter) * 2, 760px); margin: 0 auto; }
.section-title { font-family: var(--f-hand); font-weight: 600; font-size: clamp(26px, 3vw, 34px); letter-spacing: .12em; line-height: 1.5; margin: 0 0 28px; }
.about-lead, .contact-lead { margin: 0 0 36px; color: var(--paper-soft); }
.about-table { margin: 0; font-size: 14px; }
.about-table div { display: grid; grid-template-columns: 8em 1fr; gap: 16px; padding: 16px 0; border-top: 1px solid rgba(255,255,255,.14); }
.about-table div:last-child { border-bottom: 1px solid rgba(255,255,255,.14); }
.about-table dt { color: var(--paper-soft); }
.about-table dd { margin: 0; }
.about-table a { text-underline-offset: 4px; }

.form { display: grid; gap: 22px; }
.field label { display: block; font-size: 13px; letter-spacing: .1em; margin-bottom: 8px; }
.req { font-size: 11px; color: var(--stamp); margin-left: .4em; letter-spacing: .1em; }
.hint { margin: 6px 0 0; font-size: 12px; color: var(--paper-soft); }
.field input, .field select, .field textarea {
  width: 100%;
  font: inherit; font-size: 16px; letter-spacing: .02em;
  color: var(--paper);
  background: rgba(255,255,255,.04);
  border: 1px solid rgba(255,255,255,.22);
  border-radius: 6px;
  padding: 12px 14px;
  transition: border-color .2s, background-color .2s;
}
.field select { appearance: none; -webkit-appearance: none;
  background-image: linear-gradient(45deg, transparent 50%, var(--paper-soft) 50%), linear-gradient(135deg, var(--paper-soft) 50%, transparent 50%);
  background-position: calc(100% - 20px) 55%, calc(100% - 15px) 55%;
  background-size: 5px 5px; background-repeat: no-repeat; }
.field select option { color: var(--ink); }
.field input:focus, .field select:focus, .field textarea:focus { outline: none; border-color: var(--stamp); background-color: rgba(255,255,255,.07); }
.field [aria-invalid="true"] { border-color: #ff8f8f; }
.field--trap { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
.form-error { margin: 0; color: #ffb3a1; font-size: 14px; }
.btn--send { justify-self: start; border: none; cursor: pointer; background: var(--paper); color: var(--late); padding: 13px 34px 12px; }
.btn--send:disabled { opacity: .5; cursor: wait; }

/* ---------- footer ---------- */
.site-footer {
  background: var(--late); color: var(--paper-soft);
  padding: 56px var(--gutter) 40px;
  display: flex; flex-direction: column; align-items: center; gap: 18px;
  font-size: 13px;
}
.footer-mark {
  width: 96px; height: 52px; background: var(--paper-soft); opacity: .8;
  -webkit-mask: url(../img/logo_mark.png) center / contain no-repeat;
          mask: url(../img/logo_mark.png) center / contain no-repeat;
}
.footer-nav { display: flex; flex-wrap: wrap; justify-content: center; gap: 8px 24px; }
.footer-nav a { text-decoration: none; }
.footer-nav a:hover { color: var(--paper); }
.copyright { margin: 0; font-family: var(--f-latin); letter-spacing: .2em; font-size: 12px; }

/* ---------- 下層ページ ---------- */
.page { background: linear-gradient(180deg, var(--dawn-top) 0, var(--dawn-low) 420px, #f6efe9 900px); min-height: 100vh; }
.page-inner { width: min(100% - var(--gutter) * 2, 820px); margin: 0 auto; padding: 140px 0 100px; }
.page h1 { font-family: var(--f-hand); font-weight: 600; font-size: clamp(28px, 3.4vw, 38px); letter-spacing: .12em; margin: 0 0 12px; line-height: 1.5; }
.page h2 { font-family: var(--f-hand); font-weight: 600; font-size: 21px; letter-spacing: .1em; margin: 56px 0 16px; padding-top: 22px; border-top: 1px solid rgba(30,34,48,.18); }
.page p, .page li { color: var(--ink); }
.page .lead { color: var(--ink-soft); margin-bottom: 36px; }
.page ul { padding-left: 1.3em; }
.page li { margin: 4px 0; }
.page table { width: 100%; border-collapse: collapse; font-size: 14px; margin: 8px 0; }
.page th, .page td { text-align: left; vertical-align: top; padding: 12px 10px; border-bottom: 1px solid rgba(30,34,48,.18); }
.page th { font-weight: 500; white-space: nowrap; color: var(--ink-soft); width: 11em; }
.page thead th { color: var(--ink); border-bottom-color: var(--ink); }
.page .note { font-size: 13px; color: var(--ink-soft); }
.page .back { margin-top: 56px; }

/* ---------- reveal ---------- */
.js .reveal { opacity: 0; transform: translateY(24px); transition: opacity 1s var(--ease), transform 1s var(--ease); }
.js .reveal.is-in { opacity: 1; transform: none; }

/* ---------- 読み込み時：手紙を書くように一行ずつ ---------- */
.js .hero-brand .eyebrow { animation: fade-in 1.2s var(--ease) .1s both; }
.js .hero-logo { animation: rise-in 1.4s var(--ease) .2s both; }
.hero-logo img { animation: bob 6s ease-in-out 1.6s infinite alternate; transform-origin: 50% 70%; }
.js .hero-letter span { animation: write 1.2s cubic-bezier(.45, 0, .2, 1) both; }
.js .hero-letter span:nth-child(1) { animation-delay: .8s; }
.js .hero-letter span:nth-child(2) { animation-delay: 1.3s; }
.js .hero-letter span:nth-child(3) { animation-delay: 1.8s; }
.js .hero-letter span:nth-child(4) { animation-delay: 2.7s; }
.js .hero-letter span:nth-child(5) { animation-delay: 3.0s; }
@keyframes fade-in { from { opacity: 0; } to { opacity: .75; } }
@keyframes rise-in { from { opacity: 0; transform: translateY(18px); } to { opacity: 1; transform: none; } }
@keyframes write { from { clip-path: inset(0 0 100% 0); } to { clip-path: inset(0 0 0 0); } }
@keyframes bob { from { transform: translateY(0) rotate(0deg); } to { transform: translateY(-5px) rotate(-.8deg); } }

/* 日付スタンプ：画像が出たあと、焼き付くように点く */
.js .work-visual .stamp { opacity: 0; }
.js .work-visual.is-in .stamp { animation: imprint 1.1s steps(1, end) .9s both; }
@keyframes imprint {
  0% { opacity: 0; } 18% { opacity: .9; } 26% { opacity: .15; } 38% { opacity: 1; }
  46% { opacity: .35; } 58%, 100% { opacity: 1; }
}

/* ---------- responsive ---------- */
@media (max-width: 900px) {
  .work-visual, .work-body, .work--flip .work-visual, .work--flip .work-body,
  .work--night .work-visual, .work--night .work-body { grid-column: 1 / -1; grid-row: auto; }
}
@media (max-width: 680px) {
  body { font-size: 14px; }
  .site-header { padding: 12px 16px; }
  .brand-name { display: none; }
  .site-nav { gap: 14px; }
  .site-nav a { font-size: 13px; letter-spacing: .12em; }
  .hero-inner { grid-template-columns: 1fr; justify-items: center; padding-top: 96px; gap: 36px; }
  .hero-brand { text-align: center; }
  .hero-logo { width: min(260px, 70vw); }
  .hero-letter { height: auto; max-height: 21em; font-size: 20px; }
  .about-table div { grid-template-columns: 1fr; gap: 2px; }
  .work-meta div { grid-template-columns: 5.5em 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .wave, .sky-clouds-layer, .stars::after, .hero-logo img, .film::before { animation: none; }
  .js .hero-brand .eyebrow, .js .hero-logo, .js .hero-letter span, .js .work-visual.is-in .stamp { animation: none; }
  .js .work-visual .stamp { opacity: 1; }
  .js .reveal { opacity: 1; transform: none; transition: none; }
  .btn, .btn::after, .site-nav a::after, .linkcard-link { transition: none; }
}