/* ============================================================
   StayHero（在留大将）— 设计系统：藏青·和风
   藏青 #1b4068 + 米白 + 青海波纹 + 明朝体标题
   （与 TransHero 青绿科技风彻底区分）
   ============================================================ */
:root{
  --navy:#1b4068; --navy-deep:#0f2845; --navy-soft:#35608f;
  --wave:#4a82b8; --accent:#c75b39; --gold:#b88a3e;
  --ink:#16242f; --ink-soft:#4c5b66; --ink-faint:#8a99a3;
  --bg:#faf6ee; --bg-alt:#f1ead9; --surface:#ffffff;
  --line:#e4dac7; --line-soft:#efe7d6;
  --shadow:0 12px 40px -12px rgba(15,40,69,.22);
  --shadow-sm:0 4px 16px -6px rgba(15,40,69,.16);
  --radius:18px; --radius-sm:12px; --wrap:1120px;
  --font:"Noto Sans JP","Hiragino Sans",-apple-system,"Segoe UI",sans-serif;
  --font-serif:"Noto Serif JP","Hiragino Mincho ProN","Yu Mincho",serif;
  --font-en:"Inter",var(--font);
}
*{box-sizing:border-box;margin:0;padding:0}
html{font-size:16px;scroll-behavior:smooth;-webkit-font-smoothing:antialiased}
body{font-family:var(--font);color:var(--ink);background:var(--bg);line-height:1.85;letter-spacing:.02em;overflow-x:hidden}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}

/* 青海波（せいがいは）背景纹 */
.bg-wave{position:fixed;inset:0;z-index:0;pointer-events:none;opacity:.05;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='80' height='40' viewBox='0 0 80 40'%3E%3Cg fill='none' stroke='%231b4068' stroke-width='1.3'%3E%3Cpath d='M0 40 A40 40 0 0 1 80 40'/%3E%3Cpath d='M-40 40 A40 40 0 0 1 40 40 M40 40 A40 40 0 0 1 120 40'/%3E%3Cpath d='M0 40 A26 26 0 0 1 52 40 M28 40 A26 26 0 0 1 80 40'/%3E%3Cpath d='M0 40 A13 13 0 0 1 26 40 M27 40 A13 13 0 0 1 53 40 M54 40 A13 13 0 0 1 80 40'/%3E%3C/g%3E%3C/svg%3E");background-size:80px 40px}
main,header,footer,section{position:relative;z-index:1}
.wrap{width:min(var(--wrap),92%);margin-inline:auto}

/* 导航 */
.nav{position:sticky;top:0;z-index:50;background:rgba(250,246,238,.85);backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
.nav__inner{display:flex;align-items:center;gap:16px;height:66px}
.brand{display:flex;align-items:center;gap:11px;font-weight:800;font-size:1.12rem;flex-shrink:0;white-space:nowrap}
.brand .mark{width:36px;height:36px;border-radius:10px;object-fit:cover;background:#fff;box-shadow:var(--shadow-sm);flex:0 0 auto}
.brand .jp{color:var(--navy-soft);font-weight:600;font-size:.82rem;letter-spacing:.06em;font-family:var(--font-serif);white-space:nowrap}
.nav__links{display:flex;gap:3px;margin-left:auto;align-items:center}
.nav__links a{padding:7px 11px;border-radius:10px;font-size:.88rem;font-weight:600;color:var(--ink-soft);transition:.18s;white-space:nowrap}
.nav__links a:hover{background:var(--bg-alt);color:var(--navy)}
.nav__links a.cta{background:var(--navy);color:#fff}
.nav__links a.cta:hover{background:var(--navy-deep);color:#fff}
.langsel{display:flex;gap:2px;border:1px solid var(--line);border-radius:10px;padding:3px;background:var(--surface)}
.langsel a{padding:4px 9px;border-radius:7px;font-size:.78rem;font-weight:700;color:var(--ink-faint)}
.langsel a.on{background:var(--navy);color:#fff}
html[lang="ja"] .langsel a[data-l="ja"],html[lang="zh"] .langsel a[data-l="zh"],html[lang="en"] .langsel a[data-l="en"],html[lang="vi"] .langsel a[data-l="vi"]{background:var(--navy);color:#fff}
.burger{display:none;margin-left:auto;width:42px;height:42px;border:1px solid var(--line);border-radius:10px;background:var(--surface);cursor:pointer;flex-direction:column;gap:4px;align-items:center;justify-content:center}
.burger span{width:18px;height:2px;background:var(--ink);border-radius:2px}

/* 通用 */
.section{padding:84px 0}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-family:var(--font-en);font-size:.74rem;font-weight:600;letter-spacing:.18em;text-transform:uppercase;color:var(--navy-soft);margin-bottom:16px}
.eyebrow::before{content:"";width:22px;height:2px;background:var(--gold)}
h1,h2,h3{line-height:1.4;letter-spacing:.01em;font-weight:700;font-family:var(--font-serif)}
.h-sec{font-size:clamp(1.7rem,3.6vw,2.5rem);margin-bottom:14px}
.sub{color:var(--ink-soft);font-size:1.04rem;max-width:54ch}
.btn{display:inline-flex;align-items:center;gap:8px;padding:13px 26px;border-radius:12px;font-weight:700;font-size:.96rem;transition:.18s;cursor:pointer;border:1px solid transparent}
.btn-primary{background:var(--navy);color:#fff;box-shadow:var(--shadow-sm)}
.btn-primary:hover{background:var(--navy-deep);transform:translateY(-1px)}
.btn-ghost{background:var(--surface);color:var(--navy);border-color:var(--line)}
.btn-ghost:hover{border-color:var(--navy);background:var(--bg-alt)}

/* HERO */
.hero{padding:80px 0 64px;background:radial-gradient(ellipse 90% 70% at 70% -10%,var(--bg-alt),transparent 60%)}
.hero__grid{display:grid;grid-template-columns:1.1fr .9fr;gap:48px;align-items:center}
.hero h1{font-size:clamp(2rem,5vw,3.3rem);line-height:1.3}
.hero h1 .grad{background:linear-gradient(120deg,var(--navy),var(--wave));-webkit-background-clip:text;background-clip:text;color:transparent}
.hero__lead{margin:22px 0 28px;font-size:1.12rem;color:var(--ink-soft);max-width:46ch}
.hero__cta{display:flex;gap:12px;flex-wrap:wrap}
.stores{display:flex;gap:12px;flex-wrap:wrap;margin-top:22px}
.store{display:inline-flex;align-items:center;gap:9px;padding:10px 16px;border-radius:12px;background:var(--navy-deep);color:#fff;font-size:.84rem;font-weight:600;transition:.18s}
.store:hover{transform:translateY(-1px);background:#000}
.store small{display:block;font-size:.66rem;opacity:.7;font-weight:500}
.langbadges{display:flex;flex-wrap:wrap;gap:7px;margin-top:26px}
.langbadges span{font-family:var(--font-en);font-size:.72rem;font-weight:600;padding:5px 10px;border-radius:8px;background:var(--surface);border:1px solid var(--line);color:var(--ink-soft)}
.hero__visual{background:linear-gradient(160deg,var(--navy),var(--navy-deep));border-radius:24px;padding:30px;color:#fff;box-shadow:var(--shadow);position:relative;overflow:hidden}
.hero__visual::after{content:"";position:absolute;inset:0;background:radial-gradient(circle at 80% 10%,rgba(74,130,184,.35),transparent 55%)}
.hero__visual .vrow{display:flex;align-items:flex-start;gap:11px;margin-bottom:15px;position:relative;z-index:1}
.hero__visual .vico{font-size:1.4rem}
.hero__visual .vt{font-weight:700}
.hero__visual .vd{font-size:.84rem;opacity:.85;line-height:1.5}

/* 入口卡 */
.pillars{display:grid;grid-template-columns:repeat(2,1fr);gap:22px}
.pillar{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:30px 26px;transition:.2s;display:flex;flex-direction:column}
.pillar:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:var(--navy-soft)}
.pillar .ic{width:50px;height:50px;border-radius:14px;background:var(--bg-alt);display:grid;place-items:center;font-size:1.6rem;margin-bottom:18px}
.pillar h3{font-size:1.24rem;margin-bottom:10px}
.pillar p{color:var(--ink-soft);font-size:.95rem;flex:1}
.pillar .more{margin-top:18px;color:var(--navy);font-weight:700;font-size:.9rem}

/* 数値帯 */
.feat-band{background:var(--navy-deep);color:#fff;border-radius:24px;padding:46px 40px;display:grid;grid-template-columns:repeat(4,1fr);gap:30px}
.feat-band .stat .n{font-size:2.1rem;font-weight:800;font-family:var(--font-serif);background:linear-gradient(120deg,#fff,var(--wave));-webkit-background-clip:text;background-clip:text;color:transparent}
.feat-band .stat .l{font-size:.86rem;opacity:.8;margin-top:4px}

/* 场景/列表 */
.scenes{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.scene{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-sm);padding:24px}
.scene h4{font-size:1.05rem;margin-bottom:8px;display:flex;align-items:center;gap:9px;font-family:var(--font-serif)}
.scene p{color:var(--ink-soft);font-size:.9rem}

/* CTA */
.endcta{background:linear-gradient(160deg,var(--navy),var(--navy-deep));border-radius:24px;padding:56px 40px;text-align:center;color:#fff}
.endcta h2{font-size:clamp(1.6rem,3.5vw,2.3rem);margin-bottom:12px}
.endcta p{opacity:.92;margin-bottom:26px}
.endcta .btn-primary{background:#fff;color:var(--navy)}
.endcta .btn-ghost{background:transparent;color:#fff;border-color:rgba(255,255,255,.4)}
.qr-block{display:flex;gap:22px;justify-content:center;margin-top:28px;flex-wrap:wrap}
.qr-item{background:#fff;border-radius:14px;padding:12px 12px 8px;box-shadow:0 8px 22px rgba(0,0,0,.16)}
.qr-item img{display:block;border-radius:6px;width:130px;height:130px}
.qr-item span{display:block;text-align:center;font-size:.72rem;color:var(--navy);font-weight:700;margin-top:8px}
@media(max-width:640px){.qr-block{display:none}}

/* FAQ */
.faqlist{margin-top:24px;display:flex;flex-direction:column;gap:12px}
.faqlist details{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:16px 20px}
.faqlist summary{font-weight:700;cursor:pointer;font-family:var(--font-serif)}
.faqlist p{margin-top:10px;color:var(--ink-soft)}

/* 页脚 */
.foot{background:var(--navy-deep);color:#c9d6e3;padding:54px 0 30px;margin-top:20px}
.foot__top{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:36px;padding-bottom:32px;border-bottom:1px solid rgba(255,255,255,.12)}
.foot h5{color:#fff;font-size:.8rem;letter-spacing:.12em;text-transform:uppercase;margin-bottom:14px;font-weight:700}
.foot a{display:block;color:#a9bdd1;font-size:.92rem;padding:5px 0;transition:.15s}
.foot a:hover{color:#fff}
.foot__brand p{font-size:.92rem;color:#9fb3c7;max-width:36ch;margin-top:12px}
.foot__company{padding:22px 0 4px;border-top:1px solid rgba(255,255,255,.1);margin-top:6px;font-size:.85rem;color:#9fb3c7;line-height:1.85}
.foot__company .fc-grid{display:grid;grid-template-columns:1fr 1fr;gap:0 30px;margin:8px 0}
.foot__company b{color:#d6e2ee;font-weight:600;margin-right:9px;font-size:.78rem}
.foot__company a{color:#a9bdd1;display:inline}
.foot__company .fc-legal{display:flex;gap:18px;flex-wrap:wrap;margin-top:12px}
.foot__company .fc-legal a{color:#9fc6e8;font-weight:600}
.foot__bottom{padding-top:22px;font-size:.82rem;color:#7e93a8;display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px}

/* 语言显隐 */
[data-lang]{display:none}
html[lang="ja"] [data-lang="ja"],html[lang="zh"] [data-lang="zh"],html[lang="en"] [data-lang="en"],html[lang="vi"] [data-lang="vi"]{display:revert}

/* 响应式 */
@media(max-width:920px){.hero__grid{grid-template-columns:1fr;gap:32px}.pillars{grid-template-columns:1fr}.feat-band{grid-template-columns:repeat(2,1fr);padding:36px 28px}.scenes{grid-template-columns:1fr}.foot__top{grid-template-columns:1fr 1fr}}
@media(max-width:1180px){.nav__links{position:fixed;inset:66px 0 auto 0;flex-direction:column;background:var(--surface);border-bottom:1px solid var(--line);padding:14px;gap:4px;display:none;box-shadow:var(--shadow)}.nav__links.open{display:flex}.nav__links a{width:100%;font-size:.95rem;padding:11px 12px}.langsel{margin-top:8px}.burger{display:flex}}
@media(max-width:640px){.section{padding:60px 0}.feat-band{grid-template-columns:1fr;text-align:center}.foot__top,.foot__company .fc-grid{grid-template-columns:1fr}}