/* ============================================================
   첫토익 웹 공용 디자인 시스템
   ------------------------------------------------------------
   로그인 전 소개 페이지(랜딩 + /about /classes /app /natodan
   /reviews /faq /location) 전체가 이 파일 하나를 공유한다.
   색·폰트·여백을 바꾸려면 여기만 수정하면 전 페이지에 반영됨.

   ⚠️ 학생·강사 앱(Flutter)은 이 파일과 무관 — 절대 영향 없음.
   ============================================================ */

:root{
  --yellow:#FFD600; --yellow-deep:#F5C800; --yellow-soft:#FFF7CC;
  --ink:#111827; --ink-2:#374151; --ink-3:#6B7280; --ink-4:#9CA3AF;
  --bg:#FFFFFF; --bg-soft:#FAFAF8; --bg-cream:#FFFCF2;
  --dark:#15171C;
  --line:#EAE7DF; --line-2:#F0EEE8;
  --blue:#2563EB; --blue-soft:#EFF4FF;
  --green:#1B9E4B; --green-soft:#F1FAF4;
  --radius:20px; --radius-lg:28px; --radius-pill:999px;
  --shadow-sm:0 1px 2px rgba(17,24,39,.05), 0 4px 14px rgba(17,24,39,.05);
  --shadow-md:0 6px 24px rgba(17,24,39,.08), 0 2px 6px rgba(17,24,39,.04);
  --shadow-lg:0 24px 60px rgba(17,24,39,.12);
  --max:1200px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  background:var(--bg); color:var(--ink);
  font-family:'Pretendard Variable','Pretendard',-apple-system,BlinkMacSystemFont,"Apple SD Gothic Neo","Noto Sans KR",sans-serif;
  line-height:1.7; letter-spacing:-.01em;
  -webkit-font-smoothing:antialiased; text-rendering:optimizeLegibility;
}
img,video{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
.wrap{max-width:var(--max);margin:0 auto;padding:0 24px}
.wrap-narrow{max-width:860px;margin:0 auto;padding:0 24px}

/* ── 헤더 ─────────────────────────────────────────── */
.nav{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.86);backdrop-filter:saturate(180%) blur(14px);border-bottom:1px solid var(--line-2)}
.nav-in{max-width:var(--max);margin:0 auto;padding:12px 24px;display:flex;align-items:center;gap:22px}
.brand{display:flex;align-items:center;gap:9px;font-weight:900;font-size:17px;letter-spacing:-.02em;flex-shrink:0}
.brand .mark{width:30px;height:30px;border-radius:9px;background:var(--yellow);display:grid;place-items:center;font-size:15px;color:var(--ink)}
.brand .t2{color:var(--ink-4)}
.nav-links{display:flex;gap:20px;font-size:14.5px;font-weight:600;color:var(--ink-2);margin-left:6px}
.nav-links a{padding:6px 0;border-bottom:2px solid transparent;transition:.18s}
.nav-links a:hover{color:var(--ink);border-bottom-color:var(--yellow)}
.nav-links a[aria-current="page"]{color:var(--ink);font-weight:800;border-bottom-color:var(--yellow)}
.nav-cta{margin-left:auto;display:flex;gap:8px;align-items:center}

/* 모바일 메뉴 */
.nav-toggle{display:none;background:none;border:1.5px solid var(--line);border-radius:10px;font-size:15px;cursor:pointer;padding:7px 11px;color:var(--ink-2)}
.mnav{display:none;border-top:1px solid var(--line-2);background:#fff}
.mnav.open{display:block}
.mnav a{display:block;padding:13px 24px;font-size:15px;font-weight:700;border-bottom:1px solid var(--line-2);color:var(--ink-2)}
.mnav a[aria-current="page"]{color:var(--ink);background:var(--yellow-soft)}

/* ── 버튼 ─────────────────────────────────────────── */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:7px;font-weight:800;border-radius:var(--radius-pill);transition:transform .16s, box-shadow .16s, background .16s, border-color .16s;white-space:nowrap;cursor:pointer;border:0}
.btn:active{transform:translateY(1px)}
.btn-sm{padding:9px 16px;font-size:14px}
.btn-lg{padding:15px 28px;font-size:16px}
.btn-ghost{border:1.5px solid var(--line);color:var(--ink-2);background:#fff}
.btn-ghost:hover{border-color:var(--ink-4);color:var(--ink)}
.btn-yellow{background:var(--yellow);color:var(--ink);box-shadow:0 3px 10px rgba(245,200,0,.35)}
.btn-yellow:hover{background:var(--yellow-deep);box-shadow:0 6px 18px rgba(245,200,0,.45)}
.btn-dark{background:var(--ink);color:#fff}
.btn-dark:hover{background:#000}

/* ── 섹션 ─────────────────────────────────────────── */
section{padding:96px 0}
.sec-soft{background:var(--bg-soft)}
.sec-cream{background:var(--bg-cream)}
.sec-dark{background:var(--dark);color:#fff}
.label{display:inline-block;background:#fff;border:1px solid var(--line);color:var(--ink-3);font-weight:800;font-size:12px;letter-spacing:.14em;padding:7px 15px;border-radius:var(--radius-pill);margin-bottom:18px}
h1.page-h{font-size:clamp(30px,4vw,48px);line-height:1.28;font-weight:900;letter-spacing:-.035em}
h2.sec-h{font-size:clamp(26px,3.2vw,40px);line-height:1.32;font-weight:900;letter-spacing:-.035em}
h3.sub-h{font-size:clamp(19px,2vw,24px);font-weight:900;letter-spacing:-.03em;margin-bottom:12px}
.sec-lead{margin-top:16px;font-size:clamp(14.5px,1.25vw,17px);color:var(--ink-2);line-height:1.85}
.center{text-align:center}
.center .sec-lead{max-width:640px;margin-left:auto;margin-right:auto}
.mark{background:linear-gradient(transparent 58%, var(--yellow) 58%);padding:0 3px}
.body-p{font-size:16px;color:var(--ink-2);line-height:1.9;margin:14px 0}
.body-p b,.body-p strong{color:var(--ink);font-weight:800}

/* ── 페이지 헤더(하위 페이지 공통 상단) ──────────── */
.page-head{padding:64px 0 12px}
.page-head .crumb{font-size:13px;color:var(--ink-4);font-weight:700;margin-bottom:14px}
.page-head .crumb a:hover{color:var(--ink-2)}

/* ── 카드 ─────────────────────────────────────────── */
.cards{display:grid;gap:18px;margin-top:44px}
.g2{grid-template-columns:repeat(2,1fr)}
.g3{grid-template-columns:repeat(3,1fr)}
.g4{grid-template-columns:repeat(4,1fr)}
.card{background:#fff;border:1px solid var(--line-2);border-radius:var(--radius);padding:26px;box-shadow:var(--shadow-sm);transition:transform .22s, box-shadow .22s}
.card:hover{transform:translateY(-3px);box-shadow:var(--shadow-md)}
.card .ic{font-size:26px;margin-bottom:14px;display:block}
.card h3{font-size:17.5px;font-weight:800;letter-spacing:-.025em;margin-bottom:9px}
.card p{font-size:14.5px;color:var(--ink-3);line-height:1.75}
.card ul{margin:10px 0 0 18px;font-size:14.5px;color:var(--ink-3)}
.card li{margin:5px 0}

/* ── 단계/스텝 ────────────────────────────────────── */
.steps{margin-top:44px;display:grid;gap:16px}
.step{display:grid;grid-template-columns:64px 1fr;gap:22px;align-items:start;background:#fff;border:1px solid var(--line-2);border-radius:var(--radius);padding:28px;box-shadow:var(--shadow-sm)}
.step-no{width:52px;height:52px;border-radius:16px;background:var(--yellow);display:grid;place-items:center;font-weight:900;font-size:19px}
.step-b{background:var(--blue-soft);color:var(--blue)}
.step h3{font-size:19px;font-weight:900;letter-spacing:-.03em;margin-bottom:6px}
.step .who{font-size:13px;font-weight:700;color:var(--ink-4);margin-bottom:10px}
.step p{font-size:15px;color:var(--ink-2);line-height:1.8}
.step ul{margin:12px 0 0 18px;font-size:14.5px;color:var(--ink-3)}
.step li{margin:5px 0}

/* ── 표 ───────────────────────────────────────────── */
.table-wrap{margin-top:32px;overflow-x:auto;border:1px solid var(--line-2);border-radius:var(--radius);background:#fff;box-shadow:var(--shadow-sm)}
table{width:100%;border-collapse:collapse;min-width:520px}
th,td{padding:16px 18px;text-align:left;font-size:15px;border-bottom:1px solid var(--line-2)}
th{background:var(--bg-cream);font-weight:800;font-size:14px;color:var(--ink-2);white-space:nowrap}
tr:last-child td{border-bottom:0}
td b{font-weight:800}

/* ── FAQ ──────────────────────────────────────────── */
.faq{margin-top:40px;display:grid;gap:12px}
details{background:#fff;border:1px solid var(--line-2);border-radius:16px;padding:20px 24px;box-shadow:var(--shadow-sm)}
details[open]{border-color:var(--yellow)}
summary{font-weight:800;font-size:16px;letter-spacing:-.02em;cursor:pointer;list-style:none;display:flex;justify-content:space-between;gap:16px;align-items:center}
summary::-webkit-details-marker{display:none}
summary::after{content:'+';font-size:22px;font-weight:400;color:var(--ink-4);transition:.2s}
details[open] summary::after{transform:rotate(45deg)}
details p{margin-top:14px;font-size:15px;color:var(--ink-2);line-height:1.85}

/* ── CTA ──────────────────────────────────────────── */
.cta-final{background:linear-gradient(150deg,#FFE55C,#FFD600);padding:88px 0}
.cta-final h2{font-size:clamp(28px,3.4vw,42px);font-weight:900;letter-spacing:-.035em;line-height:1.3}
.cta-final p{margin-top:18px;font-size:16.5px;color:var(--ink-2);line-height:1.8}
.cta-actions{margin-top:34px;display:flex;gap:12px;justify-content:center;flex-wrap:wrap}

/* ── 푸터 ─────────────────────────────────────────── */
footer.site{background:var(--dark);color:rgba(255,255,255,.62);padding:56px 0 40px;font-size:14px}
footer.site .cols{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:40px;margin-bottom:36px}
footer.site h4{color:#fff;font-size:15px;font-weight:800;margin-bottom:14px}
footer.site a{color:rgba(255,255,255,.62);line-height:2}
footer.site a:hover{color:var(--yellow)}
footer.site .bottom{border-top:1px solid rgba(255,255,255,.1);padding-top:22px;font-size:13px;color:rgba(255,255,255,.4)}

/* ── 스크롤 등장 ──────────────────────────────────── */
.reveal{opacity:0;transform:translateY(22px);transition:opacity .7s cubic-bezier(.16,1,.3,1), transform .7s cubic-bezier(.16,1,.3,1)}
.reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){.reveal{opacity:1;transform:none;transition:none}html{scroll-behavior:auto}}

/* ── 반응형 ───────────────────────────────────────── */
@media (max-width:1024px){
  .g4{grid-template-columns:repeat(2,1fr)}
  footer.site .cols{grid-template-columns:1fr 1fr}
}
@media (max-width:820px){
  section{padding:68px 0}
  .page-head{padding:44px 0 8px}
  .nav-links{display:none}
  .nav-toggle{display:block;margin-left:auto}
  .nav-cta{display:none}
  .nav-in{gap:10px}
  .g2,.g3{grid-template-columns:1fr}
  .step{grid-template-columns:1fr;gap:14px}
  footer.site .cols{grid-template-columns:1fr}
}

/* ── 토리 FAB — 전 소개 페이지 상주 마스코트 ─────────
   클릭 시 앱 챗봇(/chatbot)으로 연결. 앱의 ToriFab 과 동일한
   말풍선 + 모션 아바타 구성을 웹에서 재현. */
.tori-fab{position:fixed;right:22px;bottom:22px;z-index:80;display:flex;align-items:center;gap:10px;
  animation:toriIn .6s cubic-bezier(.16,1,.3,1) .8s both}
.tori-bubble{background:#fff;border:1px solid var(--line);border-radius:var(--radius-pill);
  padding:10px 16px;font-size:13.5px;font-weight:800;color:var(--ink-2);white-space:nowrap;
  box-shadow:var(--shadow-md);animation:toriBob 3.4s ease-in-out infinite}
.tori-btn{width:76px;height:76px;border-radius:50%;border:0;padding:0;cursor:pointer;overflow:hidden;
  background:radial-gradient(circle at 50% 40%, #FFF7CC, #FFE87A);
  box-shadow:0 8px 26px rgba(245,200,0,.42), 0 2px 8px rgba(17,24,39,.12);
  display:grid;place-items:center;transition:transform .22s cubic-bezier(.16,1,.3,1), box-shadow .22s;
  animation:toriFloat 4.2s ease-in-out infinite}
.tori-btn:hover{transform:scale(1.07) translateY(-3px);box-shadow:0 14px 34px rgba(245,200,0,.5)}
.tori-btn:active{transform:scale(.97)}
.tori-btn img,.tori-btn video{width:100%;height:100%;object-fit:cover;display:block}
.tori-close{position:absolute;top:-6px;right:-6px;width:22px;height:22px;border-radius:50%;
  background:#fff;border:1px solid var(--line);color:var(--ink-3);font-size:12px;line-height:1;
  cursor:pointer;display:grid;place-items:center;box-shadow:var(--shadow-sm);opacity:0;transition:opacity .2s}
.tori-wrap{position:relative}
.tori-fab:hover .tori-close{opacity:1}
@keyframes toriFloat{0%,100%{translate:0 0}50%{translate:0 -7px}}
@keyframes toriBob{0%,100%{translate:0 0}50%{translate:0 -3px}}
@keyframes toriIn{from{opacity:0;transform:translateY(20px) scale(.9)}to{opacity:1;transform:none}}
@media (prefers-reduced-motion:reduce){
  .tori-fab,.tori-btn,.tori-bubble{animation:none}
}
@media (max-width:820px){
  .tori-fab{right:14px;bottom:14px;gap:8px}
  .tori-btn{width:62px;height:62px}
  .tori-bubble{font-size:12.5px;padding:8px 13px}
}
@media (max-width:420px){
  .tori-bubble{display:none}
}