/* 영문법 허브 페이지(grammar.html) 전용 스타일 — elementary/middle/high-school-grammar.css와
   같은 K웹툰(만화 패널) 팔레트로 맞춘다(26.09.13 전면 개편). 굵은 잉크선 + 하드 오프셋
   그림자 + Navi 캐릭터로 사이트 다른 K웹툰 하부 페이지(/reading, /phonics, /adventure)와
   통일성을 유지한다. */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --ink:#17322f;--ink2:#285d50;--gray:#5c7a71;--light:#f0ece0;--white:#fffdf7;--paper:#f7f3e9;
  --font:'Pretendard','Apple SD Gothic Neo',system-ui,sans-serif;
  --gr1:#28a745;--gr2:#1a7a32;--gold:#f0c869;
  --sh-sm:3px 3px 0 var(--ink);--sh-md:5px 5px 0 var(--ink);
}
html{font-size:17px;scroll-behavior:smooth}
body{font-family:var(--font);color:var(--ink);background:var(--paper);line-height:1.75;overflow-x:hidden}

.site-header{position:sticky;top:0;z-index:50;background:var(--white);border-bottom:3px solid var(--ink)}
.site-header-inner{max-width:1180px;margin:0 auto;padding:10px 18px;display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.logo{display:flex;align-items:center;gap:8px;text-decoration:none;color:var(--ink);font-weight:950}
.logo-icon{font-size:22px}
.logo span{color:var(--gr1)}
.header-back{margin-left:auto;padding:7px 14px;border-radius:10px;border:2px solid var(--ink);background:var(--light);color:var(--ink2);
  font-size:13px;font-weight:800;text-decoration:none;white-space:nowrap}
.header-back:hover{background:var(--gold)}

.hero{max-width:1180px;margin:0 auto;padding:20px 18px 0}
.hero-card{position:relative;border-radius:18px;border:3px solid var(--ink);box-shadow:var(--sh-md);
  padding:26px 150px 26px 24px;color:#fff;background:linear-gradient(135deg,var(--gr1),var(--gr2));overflow:hidden}
.hero-card::after{content:"";position:absolute;right:18px;bottom:0;width:120px;height:120px;
  background:url("/assets/kwebtoon/sprites/navi/happy.webp") center/contain no-repeat;
  filter:drop-shadow(3px 3px 0 rgba(0,0,0,.35));pointer-events:none}
@media(max-width:640px){.hero-card{padding:24px}.hero-card::after{display:none}}
.hero-badge{display:inline-block;padding:4px 12px;border-radius:999px;background:rgba(255,255,255,.22);
  font-size:12px;font-weight:800;margin-bottom:10px}
.hero-title{font-size:26px;font-weight:950;line-height:1.35}
.hero-sub{font-size:14px;opacity:.92;margin-top:6px;max-width:520px}
.hero-chips{display:flex;gap:6px;flex-wrap:wrap;margin-top:12px}
.hero-chip{padding:4px 11px;border-radius:999px;background:rgba(255,255,255,.2);font-size:12px;font-weight:700}

.page-body{max-width:1180px;margin:0 auto;padding:18px}
.hub-section-title{font-size:14px;font-weight:900;color:var(--ink2);margin:26px 0 4px}
.hub-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:14px;margin-top:16px}
.hub-card{display:flex;flex-direction:column;gap:6px;text-decoration:none;color:inherit;
  background:var(--white);border:3px solid var(--ink);border-radius:16px;padding:22px;
  box-shadow:var(--sh-sm);transition:transform .12s,box-shadow .12s}
.hub-card:hover{border-color:var(--ink);background:#f0fdf4;transform:translate(-2px,-2px);box-shadow:var(--sh-md)}
.hub-emoji{font-size:30px}
.hub-title{font-size:16px;font-weight:900;color:var(--ink)}
.hub-target{font-size:12.5px;font-weight:800;color:var(--gr2)}
.hub-desc{font-size:13px;color:var(--ink2);line-height:1.6}

.footer{margin-top:20px}