/* =========================================================
   common.css — ARCA 안전교육컨설팅 공통 디자인 시스템
   (메인 홈페이지와 통일. 헤더/푸터/버튼/컬러/타이포/섹션 공통)
   ========================================================= */

:root{
  --navy:#1f3a5f; --navy-deep:#16293f; --blue:#2e7db8; --green:#4a9d74;
  --gold:#c2a15a; --ink:#1b2733; --gray:#5b6570; --line:#e3e8ee;
  --bg:#ffffff; --bg-soft:#f5f8fb; --bg-navy:#17293e;
}
*{margin:0;padding:0;box-sizing:border-box;}
html{scroll-behavior:smooth;}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  *{animation-duration:.001ms !important;animation-iteration-count:1 !important;transition-duration:.001ms !important;}
}
body{font-family:"Pretendard",-apple-system,sans-serif;color:var(--ink);line-height:1.65;background:var(--bg);-webkit-font-smoothing:antialiased;overflow-x:hidden;}
a{text-decoration:none;color:inherit;}
img{display:block;max-width:100%;}
ul{list-style:none;}
.wrap{max-width:1160px;margin:0 auto;padding:0 24px;}

/* 키보드 포커스 표시 (접근성) */
a:focus-visible,
button:focus-visible,
[tabindex]:focus-visible{
  outline:3px solid var(--blue);
  outline-offset:2px;
  border-radius:4px;
}

/* header */
header{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.94);backdrop-filter:blur(8px);border-bottom:1px solid var(--line);}
.nav{position:relative;display:flex;align-items:center;justify-content:space-between;height:72px;}
.logo img{height:64px;width:auto;}
.gnb{display:flex;align-items:center;gap:30px;}
.gnb a{font-size:15px;font-weight:500;color:var(--ink);transition:color .2s;}
.gnb a:hover{color:var(--blue);}
.gnb a.current{color:var(--blue);font-weight:700;}
.nav-cta{background:linear-gradient(135deg, var(--navy), var(--blue));padding:10px 20px;border-radius:6px;font-size:14px;font-weight:600;transition:opacity .2s;}
.gnb a.nav-cta, .nav-cta{color:#fff !important;}
.nav-cta:hover{opacity:.88;}
.menu-toggle{display:none;background:none;border:none;font-size:26px;color:var(--navy);cursor:pointer;min-width:44px;min-height:44px;}

/* 게시판 드롭다운 (PC 전용 - 901px 이상에서만 호버 동작) */
.gnb .has-sub{position:relative;}
.gnb .has-sub > a{display:flex;align-items:center;gap:4px;}
@media (min-width:901px){
  .gnb .has-sub > a::after{content:"";width:6px;height:6px;border-right:1.5px solid currentColor;border-bottom:1.5px solid currentColor;transform:rotate(45deg);margin-top:-3px;opacity:.7;}
  .sub-menu{
    list-style:none;margin:0;padding:8px 0;position:absolute;top:calc(100% + 14px);left:50%;transform:translateX(-50%);
    min-width:160px;background:#fff;border:1px solid var(--line);border-radius:10px;box-shadow:0 12px 30px rgba(0,0,0,.12);
    opacity:0;visibility:hidden;transform:translateX(-50%) translateY(6px);transition:opacity .18s,transform .18s,visibility .18s;
    z-index:200;
  }
  .gnb .has-sub:hover .sub-menu,
  .gnb .has-sub:focus-within .sub-menu{opacity:1;visibility:visible;transform:translateX(-50%) translateY(0);}
  .sub-menu a:hover{background:var(--bg-soft);color:var(--blue);}
}
.sub-menu li{list-style:none;}
.sub-menu a{display:block;padding:10px 18px;font-size:14px;font-weight:500;color:var(--ink);white-space:nowrap;}

/* buttons (메인과 동일) */
.btn-primary{display:inline-block;background:#fff;color:var(--navy);padding:15px 30px;border-radius:8px;font-size:16px;font-weight:700;transition:transform .15s,box-shadow .2s;box-shadow:0 6px 20px rgba(0,0,0,.15);min-height:44px;}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 10px 28px rgba(0,0,0,.22);}
.btn-ghost{display:inline-block;border:1.5px solid rgba(255,255,255,.55);color:#fff;padding:14px 24px;border-radius:8px;font-size:15px;font-weight:600;transition:background .2s,border-color .2s;min-height:44px;}
.btn-ghost:hover{background:rgba(255,255,255,.12);border-color:#fff;}

/* section common */
section{padding:88px 0;}
.sec-head{text-align:center;max-width:640px;margin:0 auto 52px;}
.sec-head .tag{font-size:13px;font-weight:700;letter-spacing:.12em;color:var(--blue);text-transform:uppercase;margin-bottom:14px;}
.sec-head h2{font-size:34px;font-weight:800;color:var(--navy);letter-spacing:-.02em;margin-bottom:14px;overflow-wrap:break-word;}
.sec-head p{font-size:17px;color:var(--gray);}

/* card grid (메인 사업영역 카드 재사용 - ISO 과정 카드에도 사용) */
.biz-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;}
.biz-card{border:1px solid var(--line);border-radius:14px;padding:38px 30px;transition:transform .2s,box-shadow .2s,border-color .2s;background:#fff;}
.biz-card:hover{transform:translateY(-6px);box-shadow:0 16px 40px rgba(31,58,95,.12);}
.biz-card:nth-child(1){background:#f8fbf8;border-color:#74b784;}
.biz-card:nth-child(1) h3{color:#5aa06f;}
.biz-card:nth-child(2){background:#f6f9fc;border-color:#6b9bc9;}
.biz-card:nth-child(2) h3{color:#3d7db0;}
.biz-card:nth-child(3){background:#faf8f2;border-color:#c4a75a;}
.biz-card:nth-child(3) h3{color:#a8873c;}
.biz-card h3{font-size:21px;font-weight:700;color:var(--navy);margin-bottom:12px;overflow-wrap:break-word;}
.biz-card p{font-size:15px;color:var(--gray);margin-bottom:20px;}
.biz-card .go{font-size:14px;font-weight:600;color:var(--blue);}

/* strengths (특징 카드) */
.strength{background:var(--bg-soft);}
.st-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px;}
.st-card{background:#fff;border-radius:12px;padding:30px 24px;text-align:center;border:1px solid var(--line);}
.st-card h4{font-size:17px;font-weight:700;color:var(--navy);margin-bottom:10px;}
.st-card p{font-size:14px;color:var(--gray);line-height:1.55;}

/* cta band */
.cta-band{background:linear-gradient(120deg,var(--blue),var(--navy));color:#fff;text-align:center;}
.cta-band h2{font-size:30px;font-weight:800;margin-bottom:14px;overflow-wrap:break-word;}
.cta-band p{font-size:17px;color:#dce8f3;margin-bottom:30px;}
.cta-band .btn-primary{background:#fff;color:var(--navy);}

/* footer */
footer{background:var(--navy-deep);color:#9fb2c6;padding:52px 0 30px;}
.foot-menu{display:flex;gap:36px;flex-wrap:wrap;margin-bottom:38px;padding-bottom:30px;border-bottom:1px solid rgba(255,255,255,.1);}
.foot-menu a{font-size:15px;color:#c3d2e0;font-weight:500;}
.foot-menu a:hover{color:#fff;}
.foot-main{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:30px;margin-bottom:30px;}
.foot-logo{height:56px;opacity:.95;}
.foot-info{font-size:14px;line-height:1.9;text-align:right;}
.foot-info a{text-decoration:underline;text-underline-offset:2px;}
.foot-bottom{border-top:1px solid rgba(255,255,255,.1);padding-top:22px;font-size:13px;color:#7e93a8;}

/* scroll reveal (공통 모션, prefers-reduced-motion 대응은 상단 전역 규칙 참조) */
.reveal{opacity:0;transform:translateY(18px);transition:opacity .6s ease,transform .6s ease;}
.reveal.in{opacity:1;transform:none;}

/* responsive: header / grids 공통 */
@media (max-width:900px){
  .biz-grid{grid-template-columns:repeat(2,1fr);}
  .st-grid{grid-template-columns:repeat(2,1fr);}
  .gnb{display:none;}
  .gnb.open{display:flex;flex-direction:column;align-items:stretch;position:absolute;top:100%;left:0;right:0;background:#fff;border-bottom:1px solid var(--line);box-shadow:0 10px 26px rgba(0,0,0,.10);padding:6px 0;gap:0;z-index:200;}
  .gnb.open a{padding:15px 24px;font-size:16px;border-bottom:1px solid #f1f4f8;color:var(--ink);min-height:44px;display:flex;align-items:center;}
  .gnb.open a:last-child{border-bottom:none;}
  .gnb.open a.nav-cta{margin:10px 20px 8px;padding:14px;border-radius:8px;text-align:center;}
  .gnb .has-sub > a::after{display:none;}
  .gnb.open .sub-menu{
    position:static;opacity:1;visibility:visible;transform:none;box-shadow:none;border:none;border-radius:0;
    background:var(--bg-soft);padding:2px 0;margin:0;
  }
  .gnb.open .sub-menu a{padding-left:44px;font-size:14.5px;border-bottom:1px solid #eef1f5;}
  .menu-toggle{display:block;}
  .menu-toggle.active{color:var(--blue);}
}
@media (max-width:560px){
  .biz-grid{grid-template-columns:1fr;}
  .st-grid{grid-template-columns:1fr;}
  section{padding:60px 0;}
  .sec-head h2{font-size:27px;}
  .foot-main{flex-direction:column;align-items:flex-start;gap:20px;}
  .foot-info{text-align:left;}
}