/* CoolSmile 新トップ デザイン案（日英共通）— 外部フォント不使用＝表示速度優先（SEO） */
:root{
  --ink:#0d1b26; --sub:#51616d; --line:#e2e8ec; --bg:#f6f9fb; --card:#fff;
  --navy:#06131f; --navy2:#0b2436; --ice:#5fd4ff; --ice2:#9be7ff; --accent:#00a3e0; --warn:#ff6a3d;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:-apple-system,BlinkMacSystemFont,"Hiragino Sans","Hiragino Kaku Gothic ProN","Noto Sans JP","Yu Gothic UI","Yu Gothic",YuGothic,Meiryo,sans-serif;
  color:var(--ink);background:var(--bg);line-height:1.8;-webkit-font-smoothing:antialiased}
img{max-width:100%;height:auto;display:block}  /* height:auto がないと縮小時に縦横比が崩れる */
a{color:inherit}
.wrap{max-width:1180px;margin:0 auto;padding:0 28px}
.eyebrow{font-size:12px;letter-spacing:.24em;text-transform:uppercase;font-weight:700;color:var(--accent)}
h2{font-size:clamp(26px,3.4vw,40px);line-height:1.35;margin:12px 0 18px;letter-spacing:.01em}
.lead{color:var(--sub);font-size:17px;max-width:720px}
section{padding:110px 0}

/* ヘッダー */
header{position:fixed;inset:0 0 auto 0;z-index:50;transition:.3s}
header .bar{display:flex;align-items:center;justify-content:space-between;height:72px}
.logo{display:flex;align-items:baseline;gap:10px;text-decoration:none;color:#fff}
.logo b{font-size:22px;letter-spacing:.02em}
.logo span{font-size:11px;letter-spacing:.2em;opacity:.7}
nav{display:flex;gap:28px;align-items:center;font-size:14px}
nav a{color:#fff;text-decoration:none;opacity:.85}
nav a:hover{opacity:1}
.lang{border:1px solid rgba(255,255,255,.35);border-radius:999px;padding:4px 12px;font-size:12px}
.btn{display:inline-flex;align-items:center;gap:8px;border-radius:999px;padding:14px 28px;font-weight:700;text-decoration:none;font-size:15px;transition:.2s}
.btn-ice{background:var(--ice);color:var(--navy)}
.btn-ice:hover{background:var(--ice2)}
.btn-ghost{border:1px solid rgba(255,255,255,.4);color:#fff}
.btn-ghost:hover{background:rgba(255,255,255,.08)}
.btn-dark{background:var(--navy);color:#fff}
nav .btn{padding:9px 20px;font-size:13px}

/* ヒーロー */
.hero{position:relative;min-height:min(100vh,920px);padding:40px 0 70px;display:flex;align-items:center;color:#fff;overflow:hidden;
  background:radial-gradient(1200px 700px at 80% 10%,#123a55 0%,transparent 60%),linear-gradient(160deg,var(--navy) 0%,var(--navy2) 100%)}
.hero::before{content:"";position:absolute;inset:-20%;
  background:conic-gradient(from 200deg at 70% 40%,transparent 0 60%,rgba(95,212,255,.18) 70%,transparent 80%);
  animation:spin 28s linear infinite;filter:blur(40px)}
@keyframes spin{to{transform:rotate(360deg)}}
.hero .grid{position:relative;display:grid;grid-template-columns:1.15fr .85fr;gap:56px;align-items:center;padding-top:72px}
.badge{display:inline-flex;gap:10px;align-items:center;border:1px solid rgba(95,212,255,.45);color:var(--ice2);
  border-radius:999px;padding:6px 16px;font-size:13px;letter-spacing:.08em}
.badge i{width:8px;height:8px;border-radius:50%;background:var(--ice);box-shadow:0 0 12px var(--ice)}
.hero h1{font-size:clamp(36px,5vw,66px);word-break:keep-all;line-height:1.15;margin:24px 0 22px;letter-spacing:-.01em}
.hero h1 em{font-style:normal;background:linear-gradient(90deg,var(--ice),#fff);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p.sub{font-size:17px;opacity:.85;max-width:560px}
.hero .ctas{display:flex;gap:14px;margin-top:36px;flex-wrap:wrap}
.hero-visual{position:relative;border-radius:24px;overflow:hidden;box-shadow:0 30px 80px rgba(0,0,0,.45);border:1px solid rgba(255,255,255,.12)}
.hero-visual img{width:100%;aspect-ratio:4/5;object-fit:cover}
.hero-visual .tag{position:absolute;left:16px;bottom:16px;background:rgba(6,19,31,.75);backdrop-filter:blur(8px);
  padding:10px 14px;border-radius:12px;font-size:12px;line-height:1.5}
.hero-visual .tag b{display:block;font-size:20px;color:var(--ice)}
.stats{position:relative;display:grid;grid-template-columns:repeat(4,1fr);gap:1px;margin-top:64px;
  background:rgba(255,255,255,.12);border-radius:18px;overflow:hidden}
.stats div{background:rgba(6,19,31,.6);padding:22px 20px}
.stats b{display:block;font-size:30px;color:var(--ice);line-height:1.2}
.stats span{font-size:13px;opacity:.8}

/* 課題 */
.problem{background:#fff}
.thermo{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:48px}
.card{background:var(--card);border:1px solid var(--line);border-radius:20px;padding:30px}
.card h3{font-size:19px;margin:10px 0 8px}
.card p{color:var(--sub);font-size:15px}
.card .k{font-size:13px;font-weight:700;color:var(--warn);letter-spacing:.06em}
.card.ok{background:var(--navy);color:#fff;border-color:var(--navy)}
.card.ok p{color:#c9d8e2}
.card.ok .k{color:var(--ice)}
.temp-bar{height:10px;border-radius:99px;margin-top:18px;background:linear-gradient(90deg,#3aa6ff,#ffd166,#ff3d3d)}

/* 技術 */
.tech .grid{display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:center}
.tech img{border-radius:20px;box-shadow:0 20px 60px rgba(13,27,38,.15)}
.points{list-style:none;margin-top:26px;display:grid;gap:14px}
.points li{display:flex;gap:14px;align-items:flex-start;font-size:15.5px}
.points li b{flex:none;width:30px;height:30px;border-radius:50%;background:var(--accent);color:#fff;display:grid;place-items:center;font-size:13px}

/* 製品 */
.products{background:#fff}
.pgrid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-top:44px}
.prod{border:1px solid var(--line);border-radius:20px;overflow:hidden;background:var(--bg);text-decoration:none;transition:.25s}
.prod:hover{transform:translateY(-4px);box-shadow:0 20px 50px rgba(13,27,38,.12)}
.prod img{width:100%;aspect-ratio:4/3;object-fit:cover;background:#dfe7ec}
.prod div{padding:22px}
.prod small{color:var(--accent);font-weight:700;letter-spacing:.08em}
.prod h3{font-size:19px;margin:4px 0 6px}
.prod p{color:var(--sub);font-size:14px}

/* 現場 */
.scenes{display:flex;flex-wrap:wrap;gap:12px;margin-top:30px}
.scenes span{background:#fff;border:1px solid var(--line);border-radius:999px;padding:10px 20px;font-size:15px}

/* 専門家・信頼 */
.trust{background:var(--navy);color:#fff}
.trust .lead{color:#b9cad6}
.trust .grid{display:grid;grid-template-columns:.9fr 1.1fr;gap:60px;align-items:start}
.quote{border-left:3px solid var(--ice);padding-left:24px;font-size:18px;line-height:1.9}
.quote cite{display:block;margin-top:14px;font-style:normal;font-size:14px;color:var(--ice2)}
.timeline{list-style:none;display:grid;gap:0}
.timeline li{display:grid;grid-template-columns:90px 1fr;gap:18px;padding:16px 0;border-bottom:1px solid rgba(255,255,255,.1);font-size:15px}
.timeline b{color:var(--ice)}
.logos{display:flex;flex-wrap:wrap;gap:10px;margin-top:30px}
.logos span{border:1px solid rgba(255,255,255,.2);border-radius:8px;padding:8px 14px;font-size:13px;color:#d6e3ec}

/* 注意喚起 */
.caution{background:#fff7f3;border-top:1px solid #ffe0d3;border-bottom:1px solid #ffe0d3;padding:70px 0}
.caution .wrap{display:grid;grid-template-columns:auto 1fr;gap:30px;align-items:center}
.caution .ic{width:72px;height:72px;border-radius:20px;background:var(--warn);color:#fff;display:grid;place-items:center;font-size:36px;font-weight:800}
.caution h2{font-size:26px;margin:0 0 8px}
.caution p{color:#6b4b3e}

/* FAQ */
details{border-bottom:1px solid var(--line);padding:22px 0}
summary{cursor:pointer;font-weight:700;font-size:17px;list-style:none;display:flex;justify-content:space-between;gap:20px}
summary::after{content:"+";color:var(--accent);font-size:22px;line-height:1}
details[open] summary::after{content:"−"}
details p{color:var(--sub);margin-top:12px;font-size:15.5px}

/* ブログ */
.blog{background:#fff}
.bgrid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-top:40px}
.post{text-decoration:none;border-top:2px solid var(--ink);padding-top:18px}
.post time{font-size:13px;color:var(--sub)}
.post h3{font-size:17px;line-height:1.6;margin-top:6px}
.more{display:inline-block;margin-top:34px;font-weight:700;color:var(--accent);text-decoration:none}

/* CTA */
.cta{background:linear-gradient(135deg,#0b2436,#00517a);color:#fff;text-align:center}
.cta .lead{color:#cfe3ee;margin:0 auto}
.cta .row{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:44px;text-align:left}
.cta .box{background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.15);border-radius:20px;padding:28px;text-decoration:none}
.cta .box h3{font-size:19px;margin-bottom:6px}
.cta .box p{font-size:14px;color:#cfe3ee}
.cta .box .go{display:inline-block;margin-top:14px;color:var(--ice);font-weight:700;font-size:14px}

/* フッター */
footer{background:var(--navy);color:#9fb3c2;font-size:14px;padding:64px 0 36px}
footer .grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:40px}
footer h4{color:#fff;font-size:14px;margin-bottom:12px}
footer ul{list-style:none;display:grid;gap:6px}
footer a{text-decoration:none}
footer a:hover{color:#fff}
footer .copy{margin-top:48px;padding-top:24px;border-top:1px solid rgba(255,255,255,.1);font-size:12px}

/* ヒーロー：透過画像（切り抜き）— 枠なしで背景に溶け込ませる */
.hero-cutout{position:relative;min-height:520px;display:grid;place-items:end center}
.hero-cutout .ring{position:absolute;width:88%;aspect-ratio:1;left:6%;top:8%;border-radius:50%;
  background:radial-gradient(circle,rgba(95,212,255,.35) 0%,rgba(95,212,255,.08) 55%,transparent 70%);
  box-shadow:0 0 0 1px rgba(95,212,255,.25) inset}
.hero-cutout img{position:relative;max-height:620px;width:auto;filter:drop-shadow(0 30px 40px rgba(0,0,0,.5))}
.ph-cutout{position:relative;width:78%;height:480px;border:2px dashed rgba(95,212,255,.5);border-radius:24px;
  display:grid;place-items:center;text-align:center;color:var(--ice2);font-size:15px;line-height:1.7}
.hero-cutout img + .ph-cutout{display:none}
.hero-cutout .tag{position:absolute;right:0;bottom:24px;background:rgba(6,19,31,.75);backdrop-filter:blur(8px);
  padding:10px 14px;border-radius:12px;font-size:12px;line-height:1.5;border:1px solid rgba(255,255,255,.12)}
.hero-cutout .tag b{display:block;font-size:20px;color:var(--ice)}

/* 動画 */
.videos{background:linear-gradient(180deg,var(--navy2),var(--navy));color:#fff}
.videos .lead{color:#b9cad6}
.vgrid{display:grid;grid-template-columns:1.6fr 1fr;gap:24px;margin-top:40px}
.vside{display:grid;gap:16px}
.vitem{display:grid;grid-template-columns:160px 1fr;gap:14px;align-items:center}
.vgrid p{font-size:14px;color:#d6e3ec;line-height:1.6}
.vmain p{margin-top:12px;font-size:16px;font-weight:700;color:#fff}
.yt{position:relative;display:block;width:100%;aspect-ratio:16/9;border:0;padding:0;border-radius:14px;overflow:hidden;cursor:pointer;background:#000}
.yt img{width:100%;height:100%;object-fit:cover;opacity:.9;transition:.2s}
.yt:hover img{opacity:1;transform:scale(1.03)}
.yt .play{position:absolute;left:50%;top:50%;width:64px;height:44px;margin:-22px 0 0 -32px;border-radius:12px;background:#f00}
.yt .play::after{content:"";position:absolute;left:26px;top:13px;border-style:solid;border-width:9px 0 9px 15px;border-color:transparent transparent transparent #fff}
.vitem .yt .play{width:40px;height:28px;margin:-14px 0 0 -20px;border-radius:8px}
.vitem .yt .play::after{left:16px;top:8px;border-width:6px 0 6px 10px}
.videos iframe{width:100%;aspect-ratio:16/9;border:0;border-radius:14px}
@media (max-width:900px){.vgrid{grid-template-columns:1fr}.hero-cutout{min-height:380px}.ph-cutout{height:340px}}

/* ヒーロー画像：黒背景の比較写真を、ふちをぼかして背景に溶け込ませる */
.hero-cutout.wide{min-height:auto;display:block}
.hero-cutout.wide .ring{display:none}
/* lighten：黒い背景部分だけが紺の背景に置き換わり、人物はそのまま残る */
.hero-cutout.wide img{max-height:none;width:100%;max-width:600px;margin:0 auto;height:auto;filter:drop-shadow(0 24px 40px rgba(0,0,0,.45))}
.hero .grid > div:first-child{position:relative;z-index:2}
.hero-cutout.wide .tag{position:relative;right:auto;bottom:auto;display:inline-block;margin:-10px auto 0;left:50%;transform:translateX(-50%)}
@media (max-width:900px){.hero-cutout.wide img{width:120%;margin-left:-10%}}

.mock-note{position:fixed;right:12px;bottom:12px;z-index:99;background:#ffe14d;color:#000;font-size:12px;padding:6px 12px;border-radius:8px;font-weight:700}

@media (max-width:900px){
  header nav a:not(.btn):not(.lang){display:none}
  .hero .grid,.tech .grid,.trust .grid{grid-template-columns:1fr}
  .stats{grid-template-columns:repeat(2,1fr)}
  .thermo,.pgrid,.bgrid,.cta .row{grid-template-columns:1fr}
  footer .grid{grid-template-columns:1fr 1fr}
  section{padding:80px 0}
}

/* スマホ幅の調整（ヘッダーが折り返さないように） */
nav .btn,nav .lang{white-space:nowrap}
@media (max-width:480px){
  .wrap{padding:0 18px}
  .logo span{display:none}
  nav{gap:12px}
  nav .btn{padding:8px 14px}
}

/* ヘッダー：一番上では透明 → 下へスクロールで隠れる → 上へ戻すと紺の背景付きで現れる（header.js） */
header{transition:transform .3s ease,background-color .3s ease}
header.is-solid{background:rgba(6,19,31,.92);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);box-shadow:0 1px 0 rgba(255,255,255,.08)}
header.is-hidden{transform:translateY(-100%)}

/* 動画セクション（2026-10-07 ブラッシュアップ） */
.vgrid{grid-template-columns:minmax(0,1.65fr) minmax(0,1fr);gap:32px;align-items:stretch}
.vmain .yt{border-radius:18px;box-shadow:0 24px 60px rgba(0,0,0,.45),0 0 0 1px rgba(255,255,255,.06)}
.vmain p{margin-top:16px;font-size:17px;letter-spacing:.02em}
.vside{display:flex;flex-direction:column;justify-content:space-between;gap:14px}
.vitem{grid-template-columns:minmax(0,46%) 1fr;gap:16px;padding:10px;border-radius:14px;background:rgba(255,255,255,.03);border:1px solid rgba(255,255,255,.06);transition:background .25s,border-color .25s}
.vitem:hover{background:rgba(255,255,255,.07);border-color:rgba(95,212,255,.25)}
.vitem .yt{border-radius:10px}
.vitem p{font-size:13.5px;line-height:1.65;color:#dbe7ef;font-weight:600}
.yt img{opacity:1;transition:transform .5s ease,filter .3s}
.yt:hover img{transform:scale(1.04);filter:brightness(1.05)}
.yt::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,transparent 55%,rgba(0,0,0,.35));pointer-events:none}
/* 再生ボタン：赤い四角 → すりガラスの丸 */
.yt .play{width:72px;height:72px;margin:-36px 0 0 -36px;border-radius:50%;background:rgba(255,255,255,.18);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);border:1.5px solid rgba(255,255,255,.7);z-index:1;transition:transform .25s,background .25s}
.yt .play::after{left:29px;top:24px;border-width:12px 0 12px 19px;border-color:transparent transparent transparent #fff}
.yt:hover .play{transform:scale(1.08);background:rgba(0,163,224,.55);border-color:transparent}
.vitem .yt .play{width:38px;height:38px;margin:-19px 0 0 -19px;border-radius:50%}
.vitem .yt .play::after{left:15px;top:12px;border-width:7px 0 7px 11px}
.videos .more{display:inline-flex;margin-top:28px;padding:10px 22px;border:1px solid rgba(95,212,255,.45);border-radius:999px;text-decoration:none;font-weight:700;font-size:14px}
.videos .more:hover{background:rgba(95,212,255,.1)}
@media (max-width:900px){.vside{gap:10px}.vitem{grid-template-columns:42% 1fr}}
@media (max-width:900px){.vgrid{grid-template-columns:1fr;gap:20px}.vmain .yt .play{width:56px;height:56px;margin:-28px 0 0 -28px}.vmain .yt .play::after{left:22px;top:18px;border-width:10px 0 10px 15px}.vmain p{font-size:15px}}
/* 見出しの改行を自然に（スマホでは手動改行をやめ、言葉の切れ目で折り返す） */
h1,h2,h3{text-wrap:balance;word-break:auto-phrase}
@media (max-width:600px){section h2 br{display:none}}
footer .grid > div:first-child > p:first-child{word-break:keep-all}  /* 「CoolSmile クールスマイル」を途中で折らない */