/* 有限会社シーエスエフ 公式サイト CSS */
:root{--bg:#ffffff;--bg-elev:#f9fafb;--text:#1f2937;--muted:#4b5563;--brand:#2563eb;--brand-2:#3b82f6;--ok:#10b981;--warn:#f59e0b;--surface:#f3f4f6}

*{box-sizing:border-box}

html,body{margin:0;padding:0;background:var(--bg);color:var(--text);font:16px/1.6 system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,"Apple Color Emoji","Segoe UI Emoji"}

a{color:var(--brand);text-decoration:none}
a:hover{text-decoration:underline}

.container{max-width:1200px;margin:0 auto;padding:0 16px}

header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.9);backdrop-filter:saturate(150%) blur(6px);border-bottom:1px solid #e5e7eb}

.nav{display:flex;align-items:center;justify-content:space-between;height:60px}

.brand{display:flex;align-items:center;gap:10px;font-weight:700;color:var(--brand)}

.brand-badge{width:28px;height:28px;border-radius:8px;background:linear-gradient(135deg,var(--brand),var(--brand-2));display:grid;place-items:center;color:#fff;font-size:14px}

.nav ul{display:flex;gap:16px;list-style:none;margin:0;padding:0}

.nav a{display:inline-block;padding:8px 10px;border-radius:8px;color:var(--text)}

.nav a:hover{background:#f3f4f6}

.mobile-toggle{display:none;appearance:none;background:none;border:0;color:var(--text);font-size:22px;cursor:pointer}

@media (max-width:768px){
  .nav ul{
    position:absolute;
    top:100%;
    left:0;
    right:0;
    background:rgba(255,255,255,0.95);
    backdrop-filter:saturate(150%) blur(6px);
    border:1px solid #e5e7eb;
    border-top:none;
    flex-direction:column;
    gap:0;
    padding:8px 0;
    margin:0;
    display:none;
    z-index:100;
  }
  .nav ul.active{display:flex}
  .nav ul li{width:100%}
  .nav ul a{display:block;padding:12px 20px;margin:0;border-radius:0;width:100%}
  .mobile-toggle{display:block}
}

.hero{padding:72px 0 40px;background:linear-gradient(180deg,rgba(249,250,251,0.9),rgba(255,255,255,0.7)),url('../../images/hero_background.jpg');background-size:cover;background-position:center bottom}

.hero .tag{margin-bottom:16px}

.hero h1{font-size:clamp(28px,4vw,40px);line-height:1.2;margin:0 0 12px}

.hero p{color:var(--muted);margin:0 0 18px}

.cta{display:flex;gap:12px;flex-wrap:wrap}

.btn{display:inline-flex;align-items:center;gap:10px;padding:12px 16px;border-radius:12px;border:1px solid #d1d5db;background:#fff;color:var(--brand);font-weight:600}

.btn.primary{background:linear-gradient(135deg,var(--brand),var(--brand-2));border-color:transparent;color:#fff}

.grid{display:grid;gap:16px}

.grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}

.grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}

@media (max-width:900px){.grid-3{grid-template-columns:repeat(2,minmax(0,1fr))}}

@media (max-width:640px){.grid-3,.grid-2{grid-template-columns:1fr}}

section{padding:44px 0;border-top:1px solid #e5e7eb;scroll-margin-top:70px}

h2{font-size:22px;margin:0 0 12px}

.lead{color:var(--muted);margin:0 0 24px}

.card{background:var(--bg-elev);border:1px solid #e5e7eb;border-radius:16px;padding:18px;display:flex;flex-direction:column;align-items:flex-start;gap:8px;height:100%}

.card h3{margin:0 0 6px;font-size:18px;display:flex;align-items:center;gap:8px}

.tag{display:inline-block;padding:4px 8px;border:1px solid #d1d5db;border-radius:999px;font-size:12px;color:var(--muted)}

.icon{font-size:22px;color:var(--brand)}

footer{padding:36px 0;background:var(--surface);border-top:1px solid #e5e7eb}

.small{font-size:13px;color:var(--muted)}

.notice{border-left:3px solid var(--warn);padding:10px 14px;background:#fef3c7;border-radius:10px}

.icon{display:inline-flex;align-items:center;justify-content:center;width:32px;height:32px;border-radius:10px;background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#fff}

.icon svg{display:block}

form{display:flex;flex-direction:column;gap:20px;width:100%}

.form-group{display:flex;flex-direction:column;gap:6px}

.form-group label{font-weight:600;color:var(--text);font-size:14px}

.form-group input,.form-group textarea{padding:12px 16px;border:1px solid #d1d5db;border-radius:10px;font-size:16px;background:var(--bg);color:var(--text);transition:border-color 0.2s,box-shadow 0.2s;width:100%}

.form-group input:focus,.form-group textarea:focus{outline:none;border-color:var(--brand);box-shadow:0 0 0 3px rgba(37,99,235,0.1)}

.form-group textarea{resize:vertical;min-height:160px;font-family:inherit}

.form-submit{align-self:flex-start}

.ceo-signature{margin-top:24px;margin-left:auto;width:fit-content;text-align:right;padding-top:16px}

.ceo-signature .company{font-size:14px;color:var(--muted);margin-bottom:4px}

.ceo-signature .title{font-size:14px;color:var(--muted);margin-bottom:8px}

.ceo-signature .name{font-weight:600;color:var(--text)}