/* =========================================================
   RADWORKS — corporate site
   方針: イメージ・世界観最優先 / 余白・タイポ・淡い光で魅せる
   ========================================================= */

:root{
  --bg:#FCFDFF;
  --ink:#16202E;          /* チャコールネイビー */
  --ink-soft:#5A6478;
  --line:#E6EAF1;
  --navy:#1B2A4A;
  --accent:#2BB3A3;       /* ブルーグリーン */
  /* 淡い虹（雨上がりの空） */
  --r-blue:#8FC6F2;
  --r-violet:#B3B6F2;
  --r-pink:#F2B4D0;
  --r-mint:#9BE6D4;
  --maxw:1120px;
  --pad:clamp(20px,5vw,64px);
  --ff-en:"Space Grotesk",sans-serif;
  --ff-jp:"Zen Kaku Gothic New",sans-serif;
  --ff-min:"Zen Old Mincho",serif;
  --ease:cubic-bezier(.22,.61,.36,1);
}

/* ---------- Dark theme (ダークグレー基調) ---------- */
[data-theme="dark"]{
  --bg:#2C2F35;          /* Dark Gray（グレー寄りの暗色） */
  --bg-2:#34373E;        /* やや明るいグレー（カード等） */
  --ink:#EEF0F4;
  --ink-soft:#A7AEBA;
  --line:rgba(255,255,255,.12);
  --navy:#D2DAE8;
  --accent:#54DCC8;
}
[data-theme="dark"] .hero__aurora{filter:blur(80px);opacity:.5}
[data-theme="dark"] .blob{mix-blend-mode:screen}
[data-theme="dark"] .arc{opacity:.8}
[data-theme="dark"] .story__aurora{opacity:.4}
[data-theme="dark"] .site-header.is-scrolled{background:rgba(21,23,27,.78);box-shadow:0 1px 0 var(--line)}
[data-theme="dark"] .nav__cta{border-color:var(--ink)}
[data-theme="dark"] .nav__cta:hover{background:#fff;color:#15171B}
[data-theme="dark"] .str{background:var(--bg-2);border-color:var(--line)}
[data-theme="dark"] .str:hover{box-shadow:0 24px 60px -36px rgba(0,0,0,.7)}
[data-theme="dark"] .btn{background:#fff;color:#15171B}
[data-theme="dark"] .nav.is-open{background:rgba(21,23,27,.96)}

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  font-family:var(--ff-jp);
  color:var(--ink);
  background:var(--bg);
  line-height:1.9;
  letter-spacing:.02em;
  font-weight:400;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
ol,ul{list-style:none}

.container{width:100%;max-width:var(--maxw);margin-inline:auto;padding-inline:var(--pad)}

/* ---------- Header ---------- */
.site-header{
  position:fixed;inset:0 0 auto 0;z-index:50;
  display:flex;align-items:center;justify-content:space-between;
  padding:22px var(--pad);
  transition:background .5s var(--ease),padding .5s var(--ease),box-shadow .5s var(--ease);
}
.site-header.is-scrolled{
  background:rgba(252,253,255,.82);
  backdrop-filter:blur(14px);
  padding-block:14px;
  box-shadow:0 1px 0 var(--line);
}
.brand{display:inline-flex;align-items:center}
/* ロゴ画像に近い、やや縦長スリムなフォントでワードマーク表示 */
.brand__mark{
  font-family:"Barlow Semi Condensed",sans-serif;font-weight:600;
  font-size:1.24rem;letter-spacing:.16em;
}
/* ロゴ画像（テーマで白版/濃紺版を出し分け。既定=ダーク→白ロゴ） */
.brand__logo{width:auto;display:block}
.brand__logo--dark{display:none}
[data-theme="light"] .brand__logo--light{display:none}
[data-theme="light"] .brand__logo--dark{display:block}
.nav{display:flex;align-items:center;gap:clamp(20px,2.6vw,40px)}
.nav a{
  font-family:var(--ff-en);font-size:.82rem;font-weight:400;
  letter-spacing:.14em;color:var(--ink);opacity:.82;
  position:relative;transition:opacity .3s;
}
.nav a:not(.nav__cta)::after{
  content:"";position:absolute;left:0;bottom:-6px;width:100%;height:1px;
  background:currentColor;transform:scaleX(0);transform-origin:right;
  transition:transform .4s var(--ease);
}
.nav a:not(.nav__cta):hover{opacity:1}
.nav a:not(.nav__cta):hover::after{transform:scaleX(1);transform-origin:left}
.nav__cta{
  padding:9px 20px;border:1px solid var(--ink);border-radius:100px;
  opacity:1;transition:background .35s var(--ease),color .35s var(--ease);
}
.nav__cta:hover{background:var(--ink);color:#fff}

.nav-toggle{display:none;width:34px;height:24px;background:none;border:0;cursor:pointer;position:relative}
.nav-toggle span{position:absolute;left:0;width:100%;height:1.5px;background:var(--ink);transition:transform .4s var(--ease),opacity .3s}
.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){transform:translateY(6px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] span:nth-child(2){transform:translateY(-6px) rotate(-45deg)}

/* ---------- Hero ---------- */
.hero{
  position:relative;min-height:100svh;
  display:flex;flex-direction:column;justify-content:center;
  padding:0 var(--pad);overflow:hidden;
}
.hero__aurora{position:absolute;inset:0;z-index:0;filter:blur(60px);opacity:.9}
.blob{position:absolute;border-radius:50%;mix-blend-mode:multiply;will-change:transform}
.blob--1{width:46vw;height:46vw;left:-6vw;top:-4vw;
  background:radial-gradient(circle at 30% 30%,var(--r-blue),transparent 68%);
  animation:drift1 18s var(--ease) infinite alternate}
.blob--2{width:42vw;height:42vw;right:-4vw;top:6vw;
  background:radial-gradient(circle at 60% 40%,var(--r-pink),transparent 68%);
  animation:drift2 22s var(--ease) infinite alternate}
.blob--3{width:38vw;height:38vw;left:28vw;bottom:-10vw;
  background:radial-gradient(circle at 50% 50%,var(--r-mint),transparent 66%);
  animation:drift3 20s var(--ease) infinite alternate}
.blob--4{width:50vw;height:50vw;right:-10vw;top:-12vw;
  background:radial-gradient(circle at 50% 50%,var(--r-violet),transparent 70%);
  animation:drift1 24s var(--ease) infinite alternate}
/* 虹のアーク（控えめ・抽象） */
.arc{
  position:absolute;left:50%;top:58%;translate:-50% 0;
  width:120vw;height:120vw;border-radius:50%;
  background:conic-gradient(from 210deg at 50% 50%,transparent 0deg,
     rgba(143,198,242,.0) 18deg,rgba(143,198,242,.35) 30deg,
     rgba(179,182,242,.32) 38deg,rgba(242,180,208,.30) 46deg,
     rgba(155,230,212,.0) 58deg,transparent 70deg);
  -webkit-mask:radial-gradient(circle at 50% 50%,transparent 49.3%,#000 49.5%,#000 50.2%,transparent 50.4%);
          mask:radial-gradient(circle at 50% 50%,transparent 49.3%,#000 49.5%,#000 50.2%,transparent 50.4%);
  opacity:.55;
}
/* FV背景動画レイヤー */
.hero__media{position:absolute;inset:0;z-index:1;overflow:hidden}
.hero__video{width:100%;height:100%;object-fit:cover;display:block}
.hero__overlay{
  position:absolute;inset:0;
  background:
    radial-gradient(120% 95% at 28% 42%,transparent 0%,rgba(18,20,24,.5) 100%),
    linear-gradient(180deg,rgba(18,20,24,.28),rgba(18,20,24,.6));
}

/* 動画が無い/読めない時はフォールバック（aurora）を見せる */
.hero--no-video .hero__overlay{opacity:0}
.hero--no-video .hero__aurora{opacity:.62}

.hero__inner{position:relative;z-index:2;max-width:var(--maxw);margin-inline:auto;width:100%}
.hero__eyebrow{
  font-family:var(--ff-en);font-size:.8rem;letter-spacing:.4em;
  color:var(--ink-soft);margin-bottom:clamp(20px,3vw,34px);
}
.hero__copy{
  font-family:var(--ff-min);font-weight:500;
  font-size:clamp(2.8rem,9vw,7.2rem);
  line-height:1.12;letter-spacing:.04em;
}
.hero__copy span{display:inline-block}
.hero__sub{
  margin-top:clamp(20px,3vw,34px);
  font-family:var(--ff-en);font-size:clamp(.78rem,1.6vw,.98rem);
  letter-spacing:.16em;color:var(--ink-soft);font-weight:300;
}
.hero__scroll{
  position:absolute;left:50%;bottom:34px;translate:-50% 0;z-index:2;
  display:flex;flex-direction:column;align-items:center;gap:10px;
  font-family:var(--ff-en);font-size:.66rem;letter-spacing:.3em;color:var(--ink-soft);
}
.hero__scroll i{width:1px;height:46px;background:linear-gradient(var(--ink-soft),transparent);position:relative;overflow:hidden}
.hero__scroll i::after{content:"";position:absolute;top:0;left:0;width:100%;height:40%;background:var(--ink);animation:scrolldot 2.2s var(--ease) infinite}

/* ---------- Section commons ---------- */
.section{padding-block:clamp(90px,13vw,180px);position:relative}
.sec-label{
  font-family:var(--ff-en);font-size:.74rem;letter-spacing:.34em;
  color:var(--accent);margin-bottom:clamp(22px,3vw,34px);
  display:flex;align-items:center;gap:14px;
}
.sec-label::before{content:"";width:34px;height:1px;background:var(--accent);opacity:.6}
.sec-title{
  font-family:var(--ff-min);font-weight:500;
  font-size:clamp(1.7rem,4.4vw,3rem);line-height:1.32;letter-spacing:.03em;
}

/* ---------- About ---------- */
.about__lead{
  font-family:var(--ff-min);font-weight:500;
  font-size:clamp(1.8rem,5vw,3.4rem);line-height:1.4;letter-spacing:.04em;
  margin-bottom:clamp(36px,5vw,60px);
}
.about__body p{color:var(--ink-soft);font-size:clamp(.95rem,1.5vw,1.04rem)}
.about__body p+p{margin-top:1.4em}

/* ---------- Service ---------- */
.svc-list{margin-top:clamp(44px,6vw,72px);border-top:1px solid var(--line)}
.svc{
  display:flex;gap:clamp(20px,5vw,68px);align-items:baseline;
  padding:clamp(26px,4vw,44px) 0;border-bottom:1px solid var(--line);
  transition:padding-left .5s var(--ease);
}
.svc:hover{padding-left:14px}
.svc__no{font-family:var(--ff-en);font-size:.92rem;color:var(--accent);letter-spacing:.1em;flex:0 0 auto;padding-top:.5em}
.svc__main h3{font-size:clamp(1.2rem,2.6vw,1.6rem);font-weight:500;letter-spacing:.04em;margin-bottom:.7em}
.svc__main p{color:var(--ink-soft);font-size:clamp(.92rem,1.4vw,1rem);max-width:680px}

/* ---------- Strength ---------- */
.str-grid{
  margin-top:clamp(44px,6vw,72px);
  display:grid;grid-template-columns:repeat(2,1fr);gap:clamp(24px,3vw,48px);
}
.str{padding:clamp(28px,3vw,40px);border:1px solid var(--line);border-radius:14px;background:#fff;transition:transform .5s var(--ease),box-shadow .5s var(--ease)}
.str:hover{transform:translateY(-6px);box-shadow:0 24px 60px -36px rgba(22,32,46,.4)}
.str h3{font-size:clamp(1.06rem,2vw,1.24rem);font-weight:500;margin-bottom:.8em;letter-spacing:.03em}
.str p{color:var(--ink-soft);font-size:.95rem}

/* ---------- Story ---------- */
.story{overflow:hidden}
.story__aurora{position:absolute;inset:0;z-index:0;filter:blur(70px);opacity:.5;pointer-events:none}
.story .container{position:relative;z-index:1}
.story__logo{margin:0 auto clamp(28px,4vw,44px);display:flex;justify-content:center}
.story__logo .brand__logo{height:clamp(92px,11vw,140px)}
.story__title{font-family:var(--ff-min);font-weight:500;font-size:clamp(1.8rem,5vw,3.4rem);line-height:1.4;letter-spacing:.04em;margin-bottom:clamp(36px,5vw,60px)}
.story__body p{color:var(--ink-soft);font-size:clamp(.95rem,1.5vw,1.04rem)}
.story__body p+p{margin-top:1.4em}
.story__career{margin-top:clamp(38px,4.5vw,58px);border-top:1px solid var(--line)}
.story__career>div{display:flex;gap:clamp(18px,4vw,44px);padding:clamp(13px,1.8vw,18px) 0;border-bottom:1px solid var(--line)}
.story__career dt{flex:0 0 clamp(64px,9vw,88px);font-family:var(--ff-en);font-size:.86rem;letter-spacing:.04em;font-weight:500;color:var(--accent)}
.story__career dd{color:var(--ink-soft);font-size:clamp(.9rem,1.4vw,.98rem);line-height:1.5}
.story__sign{margin-top:clamp(30px,3.6vw,44px);text-align:right;line-height:1.5}
.story__sign small{display:block;font-size:.82rem;letter-spacing:.08em;color:var(--ink-soft);margin-bottom:.4em}
.story__sign strong{font-family:var(--ff-min);font-weight:500;font-size:clamp(1.15rem,2.4vw,1.5rem);letter-spacing:.18em}

/* ---------- Company ---------- */
.company__list{margin-top:clamp(40px,5vw,60px);border-top:1px solid var(--line)}
.company__list>div{display:flex;gap:clamp(20px,5vw,80px);padding:clamp(18px,2.4vw,26px) 0;border-bottom:1px solid var(--line)}
.company__list dt{flex:0 0 clamp(110px,16vw,180px);font-size:.9rem;letter-spacing:.08em;font-weight:500}
.company__list dd{color:var(--ink-soft);font-size:.96rem}

/* ---------- Contact ---------- */
.contact{text-align:center}
.contact__inner{display:flex;flex-direction:column;align-items:center}
.contact .sec-label{justify-content:center}
.contact .sec-label::before{display:none}
.contact__title{font-family:var(--ff-min);font-weight:500;font-size:clamp(2rem,6vw,4rem);line-height:1.3;letter-spacing:.04em}
.contact__lead{max-width:600px;margin:clamp(26px,3vw,38px) auto;color:var(--ink-soft);font-size:clamp(.95rem,1.5vw,1.02rem)}
.btn{
  display:inline-flex;align-items:center;gap:12px;
  padding:18px 46px;border-radius:100px;background:var(--ink);color:#fff;
  font-family:var(--ff-en);font-size:.9rem;letter-spacing:.12em;
  transition:transform .4s var(--ease),box-shadow .4s var(--ease);
}
.btn:hover{transform:translateY(-3px);box-shadow:0 20px 44px -22px rgba(22,32,46,.7)}
.contact__mail{display:inline-block;margin-top:clamp(18px,2.4vw,26px);font-family:var(--ff-en);font-size:.92rem;letter-spacing:.1em;color:var(--ink-soft);border-bottom:1px solid transparent;transition:color .3s var(--ease),border-color .3s var(--ease)}
.contact__mail:hover{color:var(--ink);border-color:var(--line)}

/* ---------- Footer ---------- */
.site-footer{padding-block:48px;border-top:1px solid var(--line)}
.footer__inner{display:flex;justify-content:space-between;align-items:center;gap:20px}
.footer__brand{font-family:"Barlow Semi Condensed",sans-serif;font-weight:600;letter-spacing:.16em;font-size:1.12rem}
.footer__copy{font-family:var(--ff-en);font-size:.74rem;letter-spacing:.12em;color:var(--ink-soft)}

/* ---------- Reveal ---------- */
.reveal{transition:opacity 1s var(--ease) var(--d,0s),transform 1s var(--ease) var(--d,0s)}
.js .reveal{opacity:0;transform:translateY(26px)}      /* JSがある時だけ隠す＝白画面防止 */
.reveal.is-in{opacity:1;transform:none}

/* ---------- Keyframes ---------- */
@keyframes drift1{to{transform:translate(6vw,4vw) scale(1.12)}}
@keyframes drift2{to{transform:translate(-5vw,5vw) scale(1.1)}}
@keyframes drift3{to{transform:translate(3vw,-5vw) scale(1.15)}}
@keyframes scrolldot{0%{transform:translateY(-100%)}100%{transform:translateY(250%)}}

/* ---------- Responsive ---------- */
@media (max-width:760px){
  .nav{
    position:fixed;inset:0;flex-direction:column;justify-content:center;gap:30px;
    background:rgba(252,253,255,.96);backdrop-filter:blur(16px);
    opacity:0;visibility:hidden;transition:opacity .5s var(--ease),visibility .5s;
  }
  .nav.is-open{opacity:1;visibility:visible}
  .nav a{font-size:1.1rem}
  .nav-toggle{display:block;z-index:60}
  .str-grid{grid-template-columns:1fr}
  .svc{flex-direction:column;gap:10px}
  .company__list>div{flex-direction:column;gap:5px}
  .company__list dt{flex:0 0 auto}   /* 縦並びでは幅指定(=高さ化)を解除して余計な空きを防ぐ */
}

@media (prefers-reduced-motion:reduce){
  *{animation:none!important}
  .reveal{opacity:1;transform:none}
  html{scroll-behavior:auto}
}