/* ============================================================
   bluestella — DL ページ
   黑色背景・深蓝色前景 / 全屏视频 / 滚动覆盖
   ============================================================ */

:root{
  --black:#000000;
  --ink:#02040a;
  --deep:#061225;
  --deep-2:#0a1d3d;
  --blue:#12315f;
  --line:rgba(111,216,255,.14);
  --aqua:#6fd8ff;
  --aqua-soft:#b9e9ff;
  --gold:#e8b45a;
  --gold-soft:#f7d9a0;
  --text:#dfe7f3;
  --muted:#8fa2bd;
  --serif:'Noto Serif JP','Yu Mincho','Hiragino Mincho ProN','MS PMincho',serif;
  --script:'Caveat','Segoe Script','Brush Script MT',cursive;
}

*{box-sizing:border-box;margin:0;padding:0}
[hidden]{display:none!important}
html{scroll-behavior:smooth}
body{
  background:var(--black);
  color:var(--text);
  font-family:var(--serif);
  font-weight:300;
  line-height:1.9;
  letter-spacing:.06em;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
body.nav-open{overflow:hidden}
::selection{background:rgba(111,216,255,.25);color:#fff}
a{color:inherit;text-decoration:none}
ul{list-style:none}
video,svg{display:block}
img{display:block;max-width:100%}

/* ============================================================
   HERO（固定背景）
   ============================================================ */
.hero{
  position:fixed;
  inset:0;
  height:100vh;
  height:100svh;
  overflow:hidden;
  z-index:0;
  will-change:filter,transform;
  background:
    radial-gradient(120% 90% at 50% 120%, rgba(18,49,95,.55), rgba(2,4,10,.9) 62%),
    linear-gradient(180deg,#02060f 0%,#041226 55%,#02040a 100%);
}
.hero__video{
  position:absolute;inset:0;
  width:100%;height:100%;
  object-fit:cover;
  z-index:1;
  user-select:none;
  pointer-events:none;
  will-change:transform;
}
.hero__overlay{
  position:absolute;inset:0;
  z-index:2;
  background:
    linear-gradient(180deg, rgba(2,4,10,.55) 0%, rgba(2,4,10,.18) 35%, rgba(2,4,10,.18) 58%, var(--ink) 96%),
    radial-gradient(90% 60% at 50% 50%, rgba(2,4,10,.25), rgba(2,4,10,.5));
}
.hero__canvas{
  position:absolute;inset:0;
  z-index:3;
  pointer-events:none;
}

/* 光のエフェクト */
.light{
  position:absolute;
  z-index:4;
  width:62vmin;height:62vmin;
  border-radius:50%;
  pointer-events:none;
  filter:blur(8px);
  mix-blend-mode:screen;
}
.light--aqua{
  top:-12vmin;right:-8vmin;
  background:radial-gradient(circle, rgba(111,216,255,.32) 0%, rgba(111,216,255,.10) 42%, transparent 72%);
  animation:drift 9s ease-in-out infinite;
}
.light--orange{
  bottom:-14vmin;left:-10vmin;
  background:radial-gradient(circle, rgba(232,180,90,.30) 0%, rgba(232,180,90,.08) 42%, transparent 72%);
  animation:drift 11s ease-in-out infinite reverse;
}
@keyframes drift{
  0%,100%{transform:translate(0,0) scale(1)}
  50%{transform:translate(3vmin,-2vmin) scale(1.08)}
}

/* ロゴ（右上） */
.hero__logo{
  position:absolute;
  top:6vh;right:5vw;
  z-index:5;
  width:160px;
  user-select:none;
}
.hero__replay{
  display:block;width:100%;padding:0;border:0;
  background:transparent;color:inherit;cursor:pointer;
}
.hero__replay:focus-visible{outline:1px solid var(--aqua-soft);outline-offset:8px}
.logo-mark{
  display:block;
  aspect-ratio:2000 / 1460;
  overflow:hidden;
  filter:drop-shadow(0 0 22px rgba(111,216,255,.35)) drop-shadow(0 0 60px rgba(111,216,255,.18));
}
/* 保留原图片的图形及尺寸，隐藏其中已有的品牌文字。 */
.logo-mark .logo-img{clip-path:inset(0 0 27% 0)}
.logo-img{
  width:100%;height:auto;
  opacity:0;
  transform:translateY(-14px);
}
.is-logo-ready .logo-img{animation:logoIn 2s ease 1.2s forwards}
@keyframes logoIn{to{opacity:1;transform:none}}
.logo-wordmark{
  width:100%;
  height:auto;
  margin:2px auto 0;
  color:var(--aqua-soft);
  filter:drop-shadow(0 0 8px rgba(111,216,255,.28));
}
.logo-wordmark__stroke{
  opacity:0;
  stroke-dasharray:1;
  stroke-dashoffset:1;
}
/* logoIn 结束后由 JS 添加 is-writing，按实际落笔顺序绘制。 */
.is-writing .logo-wordmark__stroke{
  animation:logoWrite var(--write-duration) linear var(--write-delay) both;
}
@keyframes logoWrite{
  0%{opacity:0;stroke-dashoffset:1}
  1%{opacity:1}
  100%{opacity:1;stroke-dashoffset:0}
}

/* ステートメント・理念（左下） */
.hero__statement{
  position:absolute;
  left:6vw;bottom:9vh;
  z-index:5;
  max-width:min(88vw,720px);
  user-select:none;
}
.statement__main{
  font-size:clamp(22px,3.4vw,40px);
  font-weight:400;
  letter-spacing:.18em;
  color:var(--gold-soft);
  text-shadow:0 0 26px rgba(232,180,90,.35);
  opacity:0;
  transform:translateY(18px);
}
.statement__sub{
  margin-top:1.1em;
  font-size:clamp(12px,1.4vw,15px);
  letter-spacing:.22em;
  color:var(--gold);
  opacity:0;
  transform:translateY(18px);
}
.is-loaded .statement__main{animation:rise 1.6s ease 2.4s forwards}
.is-loaded .statement__sub{animation:rise 1.6s ease 3.2s forwards}
@keyframes rise{to{opacity:1;transform:none}}

/* スクロールヒント */
.scroll-hint{
  position:absolute;
  bottom:4vh;left:50%;
  transform:translateX(-50%);
  z-index:5;
  color:var(--muted);
  font-size:10px;
  letter-spacing:.4em;
  text-transform:uppercase;
  user-select:none;
}
.scroll-hint::after{
  content:'';
  display:block;
  margin:10px auto 0;
  width:1px;height:46px;
  background:linear-gradient(180deg,var(--aqua),transparent);
  animation:drop 2.2s ease-in-out infinite;
}
@keyframes drop{
  0%{transform:scaleY(0);transform-origin:top}
  50%{transform:scaleY(1);transform-origin:top}
  50.1%{transform-origin:bottom}
  100%{transform:scaleY(0);transform-origin:bottom}
}

/* メニュートリガー */
.menu-trigger{
  position:fixed;
  top:26px;left:26px;
  z-index:60;
  width:46px;height:46px;
  background:rgba(6,18,37,.4);
  border:1px solid rgba(111,216,255,.25);
  border-radius:50%;
  cursor:pointer;
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:5px;
  transition:border-color .4s, background .4s;
  backdrop-filter:blur(4px);
}
.menu-trigger span{
  display:block;width:18px;height:1px;background:var(--aqua);
  transition:transform .4s, opacity .4s;
}
.menu-trigger:hover{border-color:var(--aqua);background:rgba(18,49,95,.55)}
.menu-trigger:hover span{background:#fff}

/* ナビゲーション（顶部横向，向右展开） */
.nav{
  position:fixed;
  top:26px;
  left:84px;
  z-index:70;
  opacity:0;
  visibility:hidden;
  transform:translateX(-12px);
  pointer-events:none;
  transition:opacity .35s ease, transform .35s ease, visibility .35s;
}
.nav.is-open{
  opacity:1;
  visibility:visible;
  transform:translateX(0);
  pointer-events:auto;
}
.nav__list{
  display:flex;
  flex-direction:row;
  align-items:center;
  height:46px;
}
.nav__list li{margin:0;height:100%}
.nav__list a{
  display:flex;
  align-items:center;
  height:100%;
  padding:0 20px;
  font-size:13px;
  letter-spacing:.16em;
  color:var(--text);
  white-space:nowrap;
  transition:color .3s;
}
.nav__list a:hover{color:var(--aqua)}

/* 回顶部按钮 */
.to-top{
  position:fixed;
  right:26px;
  bottom:26px;
  z-index:60;
  width:46px;
  height:46px;
  background:rgba(6,18,37,.4);
  border:1px solid rgba(111,216,255,.25);
  border-radius:50%;
  color:var(--aqua);
  font-size:18px;
  line-height:1;
  cursor:pointer;
  display:flex;
  align-items:center;
  justify-content:center;
  opacity:0;
  pointer-events:none;
  transition:opacity .3s ease, border-color .3s, background .3s, color .3s;
}
.to-top.is-visible{opacity:1;pointer-events:auto}
.to-top:hover{border-color:var(--aqua);background:rgba(18,49,95,.55);color:#fff}
.to-top svg{width:22px;height:22px;display:block}

/* ============================================================
   MAIN（ビデオを覆い上げる）
   ============================================================ */
.main{
  position:relative;
  z-index:1;
  margin-top:100vh;
  margin-top:100svh;
  background:transparent;
}
/* 内容背景遮罩：上滑时由透明→不透明（JS 控制 opacity） */
.main-scrim{
  position:sticky;
  top:0;
  width:100%;
  height:100vh;
  height:100svh;
  margin-bottom:-100vh;
  margin-bottom:-100svh;
  z-index:0;
  pointer-events:none;
  background:linear-gradient(180deg, transparent 0%, var(--deep) 28%, #04101f 62%, var(--ink) 100%);
}
/* 内容区压暗层：越往下背景越黑（JS 控制 opacity） */
.main-darken{
  position:sticky;
  top:0;
  width:100%;
  height:100vh;
  height:100svh;
  margin-bottom:-100vh;
  margin-bottom:-100svh;
  z-index:1;
  pointer-events:none;
  background:#000;
  opacity:0;
}
/* 上拉后的 3D 星空／深海背景（sticky 固定于视口，不占布局高度） */
.starfield{
  position:sticky;
  top:0;
  width:100%;
  height:100vh;
  height:100svh;
  margin-bottom:-100vh;
  margin-bottom:-100svh;
  z-index:2;
  pointer-events:none;
}
.starfield canvas{display:block;pointer-events:none}
.section{
  position:relative;
  z-index:3;
  max-width:1080px;
  margin:0 auto;
  padding:14vh 7vw;
}
.section + .section{border-top:1px solid var(--line)}

/* スクロールフェードイン */
.reveal{
  opacity:0;
  transform:translateY(26px);
  transition:opacity 1.4s ease, transform 1.4s ease;
}
.reveal.is-visible{opacity:1;transform:none}

/* 見出し */
.section__head{
  display:flex;align-items:baseline;gap:18px;
  margin-bottom:2.6rem;
}
.section__index{
  font-size:12px;letter-spacing:.3em;color:var(--aqua);opacity:.7;
}
.section__title{
  font-size:clamp(20px,2.6vw,30px);
  font-weight:300;
  letter-spacing:.34em;
  color:#fff;
}

/* Story */
.story__mark{
  color:var(--aqua);
  font-size:18px;
  text-align:center;
  margin-bottom:3rem;
  opacity:.8;
}
.story p{
  font-size:clamp(14px,1.7vw,18px);
  color:var(--text);
  opacity:.85;
}
.story p + p{margin-top:1.6em}

/* Profile */
.profile__body{padding-left:clamp(0px,3vw,40px)}
.profile__line{
  font-size:clamp(15px,2vw,20px);
  letter-spacing:.12em;
  color:var(--text);
}
.profile__line--space{height:2.2em}
.profile__line--last{color:var(--gold-soft)}

/* Contact */
.contact__notice{
  font-size:13px;color:var(--muted);
  border-left:1px solid var(--aqua);
  padding-left:1.2em;
  margin-bottom:3rem;
  line-height:2.1;
}
.field{margin-bottom:1.8rem}
.field:not(.field--check) label{
  display:block;
  font-size:12px;letter-spacing:.2em;color:var(--muted);
  margin-bottom:.6em;
}
.field .req{color:var(--gold)}
.field input,
.field select,
.field textarea{
  width:100%;
  background:rgba(6,18,37,.6);
  border:1px solid rgba(111,216,255,.22);
  color:var(--text);
  padding:.9em 1em;
  font-family:var(--serif);
  font-size:15px;
  letter-spacing:.05em;
  border-radius:2px;
  outline:none;
  transition:border-color .3s, box-shadow .3s, background .3s;
}
.field select{appearance:none;cursor:pointer}
.field input:focus,
.field select:focus,
.field textarea:focus{
  border-color:var(--aqua);
  box-shadow:0 0 0 1px rgba(111,216,255,.25), 0 0 24px rgba(111,216,255,.12);
  background:rgba(10,29,61,.6);
}
.field input::placeholder,
.field textarea::placeholder{color:#4d617c}
.field textarea{resize:vertical;min-height:150px}
.field--check{margin:2rem 0}
.check{
  display:flex;align-items:flex-start;gap:.8em;
  cursor:pointer;
  margin-bottom:1em;
  font-size:14px;color:var(--text);
}
.check input{position:absolute;opacity:0;pointer-events:none}
.check__box{
  flex:0 0 auto;
  width:18px;height:18px;
  border:1px solid rgba(111,216,255,.4);
  border-radius:2px;
  position:relative;
  margin-top:.3em;
  transition:background .3s, border-color .3s;
}
.check__box::after{
  content:'';
  position:absolute;left:5px;top:1px;
  width:5px;height:10px;
  border:solid var(--gold-soft);
  border-width:0 2px 2px 0;
  transform:rotate(45deg) scale(0);
  transition:transform .3s;
}
.check input:checked + .check__box{background:rgba(111,216,255,.18);border-color:var(--aqua)}
.check input:checked + .check__box::after{transform:rotate(45deg) scale(1)}
.form__submit{
  display:inline-block;
  background:transparent;
  border:1px solid var(--aqua);
  color:var(--aqua-soft);
  padding:.9em 3em;
  font-family:var(--serif);
  font-size:14px;
  letter-spacing:.3em;
  cursor:pointer;
  transition:background .4s, color .4s, box-shadow .4s;
}
.form__submit:hover{background:rgba(111,216,255,.16);color:#fff;box-shadow:0 0 30px rgba(111,216,255,.25)}
.form__error{color:#ff9d9d;font-size:13px;margin-top:1rem}
.form__thanks{
  border:1px solid var(--line);
  padding:3rem 2rem;
  text-align:center;
  color:var(--gold-soft);
  letter-spacing:.15em;
}

/* Privacy */
.privacy__body h3{
  font-size:16px;
  letter-spacing:.18em;
  color:var(--aqua-soft);
  margin:2.2em 0 .6em;
  font-weight:400;
}
.privacy__body h3:first-child{margin-top:0}
.privacy__body p{font-size:13.5px;color:var(--muted);line-height:2}
.privacy__note{
  margin-top:2.5em;
  padding:1em 1.2em;
  border:1px dashed rgba(232,180,90,.4);
  color:var(--gold);
  font-size:13px;
}

.privacy__copy{
  margin-top:3rem;
  font-size:10px;
  letter-spacing:.2em;
  color:#5d6d84;
  text-align:center;
}

/* レスポンシブ */
@media (max-width:640px){
  .hero__logo{top:5vh;right:6vw;width:96px}
  .hero__statement{left:6vw;bottom:13vh}
  .section{padding:11vh 7vw}
  .menu-trigger{top:20px;left:20px}
  .nav{top:20px;left:76px}
  .nav__list a{padding:0 14px;font-size:12px;letter-spacing:.08em}
  .to-top{right:20px;bottom:20px}
}

/* 動きを抑える環境への配慮 */
@media (prefers-reduced-motion: reduce){
  .logo-img,.is-logo-ready .logo-img{opacity:1;transform:none;animation:none}
  .hero__logo .logo-wordmark__stroke{opacity:1;stroke-dashoffset:0;animation:none}
  .statement__main,.statement__sub{opacity:1;transform:none;animation:none}
  .reveal{transition:none}
  .light,.scroll-hint::after{animation:none}
}