:root{
  --navy:#17324D;
  --deep-navy:#0F2538;
  --navy-soft:#1b3c57;
  --yellow:#FFE27A;
  --gold:#E8B923;
  --sky:#A8D8FF;
  --ivory:#F7F1E8;
  --beige:#E8DCCB;
  --warm-white:#FFFDF8;
  --white:#FFFFFF;
  --text:#17324D;
  --text-muted:rgba(15,37,56,.65);
  --radius-lg:24px;
  --radius-md:20px;
  --radius-sm:14px;
  --shadow:0 4px 24px rgba(15,37,56,.06);
  --shadow-md:0 10px 32px rgba(15,37,56,.10);
  --max:1180px;
}

*{box-sizing:border-box;margin:0;padding:0;}
html{scroll-behavior:smooth;}
body{
  font-family:'Pretendard',-apple-system,BlinkMacSystemFont,'Malgun Gothic',sans-serif;
  background:var(--ivory);
  color:var(--text);
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
  letter-spacing:-0.01em;
  word-break:keep-all;
  overflow-wrap:break-word;
}
a{text-decoration:none;color:inherit;}
ul{list-style:none;}
img{max-width:100%;display:block;}
.container{max-width:var(--max);margin:0 auto;padding:0 24px;}
.container--narrow{max-width:900px;}

/* ---------- line-break safety ---------- */
h1,h2,h3,h4,p,li,blockquote,
.badge,.tip-box,.info-item__value,.emphasis-box,
.preview-row__grade,.preview-row__score{
  text-wrap:balance;
}

/* ---------- fade-in ---------- */
.fade{opacity:0;transform:translateY(16px);transition:opacity .6s ease, transform .6s ease;}
.fade.in{opacity:1;transform:translateY(0);}

/* ---------- eyebrow ---------- */
.eyebrow{display:flex;align-items:center;gap:14px;margin-bottom:20px;}
.eyebrow__line{width:44px;height:2px;background:var(--navy);opacity:.35;flex:0 0 44px;}
.eyebrow__text{font-size:14px;font-weight:700;color:var(--navy);letter-spacing:.01em;}
.eyebrow__num{
  display:inline-flex;align-items:center;justify-content:center;
  width:26px;height:26px;border-radius:50%;background:var(--sky);color:var(--navy);
  font-size:12px;font-weight:800;flex:0 0 26px;
}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:16px 28px;border-radius:999px;font-weight:700;font-size:16px;
  transition:transform .15s ease, box-shadow .15s ease, background .15s ease;
  white-space:nowrap;border:2px solid transparent;cursor:pointer;
}
.btn--primary{background:var(--sky);color:var(--navy);}
.btn--primary:hover{transform:translateY(-2px);box-shadow:0 10px 24px rgba(168,216,255,.5);}
.btn--outline{background:transparent;border:2px solid var(--white);color:var(--white);}
.btn--outline:hover{background:rgba(255,255,255,.1);}
.btn--outline-navy{background:var(--warm-white);border:2px solid rgba(23,50,77,.15);color:var(--navy);}
.btn--outline-navy:hover{background:var(--ivory);}
.btn--sm{padding:10px 20px;font-size:14px;}
.btn__arrow{font-size:15px;transition:transform .15s ease;}
.btn:hover .btn__arrow{transform:translateX(3px);}
.btn__icon{display:inline-flex;align-items:center;justify-content:center;width:22px;height:22px;border-radius:50%;background:rgba(23,50,77,.12);font-size:10px;font-weight:800;flex:0 0 22px;}
.btn__icon svg{width:13px;height:13px;}

/* ---------- header ---------- */
.header{
  position:fixed;top:0;left:0;right:0;z-index:100;
  background:rgba(255,253,248,.88);backdrop-filter:blur(10px);
  border-bottom:1px solid rgba(15,37,56,.06);
}
.header__inner{display:flex;align-items:center;justify-content:space-between;height:80px;}
.logo{font-size:21px;font-weight:800;color:var(--navy);display:flex;align-items:center;}
.logo__img{height:50px;width:50px;border-radius:12px;object-fit:cover;display:block;}
.nav{display:flex;gap:32px;}
.nav a{font-weight:600;font-size:15px;color:var(--text);opacity:.8;}
.nav a:hover{opacity:1;color:var(--navy);}
.header__cta{padding:11px 22px;font-size:14px;}
.hamburger{display:none;flex-direction:column;gap:5px;background:none;border:none;cursor:pointer;padding:8px;}
.hamburger span{width:22px;height:2px;background:var(--navy);display:block;}

/* ---------- sections ---------- */
.section{padding:110px 0;position:relative;}
.section--navy{background:var(--deep-navy);}
.section__title{font-size:clamp(26px,3.6vw,40px);font-weight:800;color:var(--text);margin-bottom:20px;line-height:1.45;}
.section--navy .section__title{color:var(--white);}
.section__desc{font-size:16px;color:var(--text-muted);max-width:640px;margin-bottom:48px;line-height:1.85;}
.section--navy .section__desc{color:rgba(255,255,255,.75);}
.hl{color:var(--gold);}
.section--navy .hl{color:var(--yellow);}

/* decorative background arcs (svg, absolute, behind content) */
.section__arcs{position:absolute;top:0;right:0;width:520px;height:100%;overflow:hidden;pointer-events:none;z-index:0;opacity:.5;}
.section__content{position:relative;z-index:1;}

/* ---------- grid utility ---------- */
.grid{display:grid;gap:22px;}
.grid--2{grid-template-columns:repeat(2,1fr);}
.grid--3{grid-template-columns:repeat(3,1fr);}
.grid--4{grid-template-columns:repeat(4,1fr);}
.grid--5{grid-template-columns:repeat(5,1fr);}

/* ---------- icon circle variants ---------- */
.icon-circle{
  display:flex;align-items:center;justify-content:center;flex:0 0 52px;
  width:52px;height:52px;border-radius:50%;margin-bottom:18px;
}
.icon-circle svg{width:24px;height:24px;}
.icon-circle--beige{background:var(--beige);color:var(--navy);}
.icon-circle--sky{background:var(--sky);color:var(--navy);}
.icon-circle--yellow{background:var(--yellow);color:var(--navy);}
.icon-circle--ring{background:transparent;border:1.6px solid rgba(23,50,77,.25);color:var(--navy);}
.icon-circle--red{color:#E24C3F;}
.icon-circle--white{background:rgba(255,255,255,.12);color:var(--white);}
.icon-circle--sm{width:44px;height:44px;flex:0 0 44px;margin-bottom:0;}
.icon-circle--sm svg{width:20px;height:20px;}

/* ---------- hero ---------- */
.hero{padding:150px 0 100px;background:var(--ivory);position:relative;overflow:hidden;}
.hero__grid{display:grid;grid-template-columns:1.05fr .95fr;gap:64px;align-items:center;}
.hero__title{color:var(--text);font-size:clamp(32px,4.2vw,50px);font-weight:800;line-height:1.35;margin-bottom:22px;}
.hero__desc{color:var(--text-muted);font-size:17px;margin-bottom:36px;line-height:1.85;}
.hero__stats{display:flex;flex-wrap:wrap;gap:28px;margin-bottom:40px;}
.hero__stat{display:flex;flex-direction:column;align-items:center;gap:10px;text-align:center;width:100px;}
.hero__stat .icon-circle{margin-bottom:0;}
.hero__stat span{font-size:13px;font-weight:700;color:var(--text);}
.hero__btns{display:flex;flex-wrap:wrap;gap:12px;}

.hero__photo-wrap{position:relative;}
.hero__photo{
  width:100%;aspect-ratio:4/5;object-fit:cover;border-radius:var(--radius-lg);
  box-shadow:var(--shadow-md);
}
.hero__preview{
  position:absolute;left:-32px;bottom:-32px;width:calc(100% - 40px);
  border-radius:var(--radius-lg);box-shadow:0 16px 40px rgba(15,37,56,.25);
}
.preview-row{display:flex;align-items:center;justify-content:space-between;padding:10px 0;border-bottom:1px dashed rgba(255,255,255,.15);}
.preview-row:last-child{border-bottom:none;}
.preview-row__grade{font-weight:700;color:var(--white);font-size:14px;}
.preview-row__score{font-size:13px;color:rgba(255,255,255,.65);font-weight:600;display:flex;align-items:center;gap:6px;}
.preview-row__score .after{
  display:inline-flex;align-items:center;
  color:var(--navy);font-weight:800;font-size:15px;
  background:var(--yellow);padding:2px 8px;border-radius:8px;
}

/* ---------- preview section (성적향상 미리보기, standalone) ---------- */
.preview-card{
  background:var(--warm-white);border:1px solid rgba(23,50,77,.08);border-radius:var(--radius-md);
  padding:28px;box-shadow:var(--shadow);text-align:center;
}
.preview-card__grade{font-size:14px;font-weight:700;color:var(--text-muted);padding-bottom:14px;margin-bottom:14px;border-bottom:1px dashed rgba(23,50,77,.12);}
.preview-card__score{font-size:22px;font-weight:700;color:var(--text);display:flex;align-items:center;justify-content:center;gap:10px;}

/* ---------- shared score-arrow / pill ---------- */
.score-arrow{color:var(--text-muted);font-weight:400;}
.score-pill{
  display:inline-flex;align-items:center;
  color:var(--navy);font-weight:800;font-size:inherit;
  background:var(--yellow);padding:2px 10px;border-radius:8px;
}
.score-pill--muted{background:rgba(23,50,77,.08);color:var(--text-muted);font-weight:700;}

/* ---------- videos ---------- */
.video-grid{grid-template-columns:repeat(3,1fr);}
.video-card{display:flex;flex-direction:column;gap:14px;}
.video-wrap{position:relative;border-radius:var(--radius-md);overflow:hidden;background:#000;aspect-ratio:16/9;box-shadow:var(--shadow);}
.video-wrap img{width:100%;height:100%;object-fit:cover;}
.video-card__label{font-size:14px;font-weight:700;color:var(--text);text-align:center;}
.video-fallback{
  display:block;text-align:center;background:var(--sky);color:var(--navy);
  font-size:13px;font-weight:700;padding:10px 16px;border-radius:999px;
}
.video-fallback:hover{background:#93c9f5;}

/* ---------- philosophy ---------- */
.philosophy{background:var(--ivory);padding:120px 0;position:relative;overflow:hidden;}
.philosophy__grid{display:grid;grid-template-columns:1.2fr .8fr;gap:40px;align-items:center;}
.philosophy__title{font-size:clamp(28px,4vw,44px);font-weight:800;color:var(--text);line-height:1.4;margin-bottom:28px;}
.philosophy__body p{font-size:16px;color:var(--text-muted);line-height:1.9;margin-bottom:20px;}
.philosophy__graphic{position:relative;height:340px;}
.philosophy__graphic svg{position:absolute;inset:0;width:100%;height:100%;}

/* ---------- trust cards (말보다 결과로) ---------- */
.trust-card{
  background:var(--warm-white);border:1px solid rgba(23,50,77,.06);border-radius:var(--radius-md);
  padding:32px 24px;box-shadow:var(--shadow);text-align:center;position:relative;overflow:hidden;
}
.trust-card__icon{margin:0 auto 18px;}
.trust-card__num{font-size:26px;font-weight:800;color:var(--text);margin-bottom:8px;white-space:nowrap;}
.trust-card__divider{width:36px;height:3px;background:var(--gold);margin:14px auto;border-radius:2px;}
.trust-card__label{font-size:14px;color:var(--text-muted);font-weight:600;}
.trust-card__dots{
  position:absolute;bottom:14px;left:0;right:0;
  display:grid;grid-template-columns:repeat(6,1fr);gap:6px;padding:0 24px;opacity:.35;
}
.trust-card__dots span{width:3px;height:3px;border-radius:50%;background:var(--navy);margin:0 auto;}

/* ---------- math case cards ---------- */
.case-card{
  background:var(--warm-white);border:1px solid rgba(23,50,77,.06);border-radius:var(--radius-md);
  padding:26px;box-shadow:var(--shadow);text-align:center;
}
.case-card__avatar{margin:0 auto 14px;}
.case-card__grade{font-size:15px;font-weight:700;color:var(--text);margin-bottom:10px;}
.case-card__score{font-size:19px;font-weight:700;color:var(--text);display:flex;align-items:center;justify-content:center;gap:8px;}
.case-card__note{margin-top:8px;font-size:12px;color:var(--text-muted);}
.case-note{font-size:14px;color:var(--text-muted);text-align:center;line-height:1.9;margin-top:36px;}

/* ---------- point cards (문제집만...) ---------- */
.point-card{
  background:var(--warm-white);border:1px solid rgba(23,50,77,.08);border-radius:var(--radius-md);
  padding:28px 24px;text-align:center;
}
.point-card__label{font-size:15px;font-weight:700;color:var(--text);margin-top:4px;}
.point-card__divider{width:28px;height:2px;background:var(--gold);margin:12px auto 0;border-radius:2px;}
.emphasis-box{
  position:relative;overflow:hidden;
  background:var(--navy);color:var(--white);border-radius:var(--radius-lg);
  padding:36px 40px;text-align:center;font-size:clamp(17px,2.3vw,21px);font-weight:700;line-height:1.7;margin-top:44px;
}
.emphasis-box .hl{color:var(--yellow);}

/* ---------- process / system (6단계) ---------- */
.process-row{display:grid;grid-template-columns:1fr auto 1fr auto 1fr;gap:16px;align-items:center;margin-bottom:22px;}
.process-row:last-child{margin-bottom:0;}
.process-arrow{color:var(--sky);font-size:24px;font-weight:700;}
.process-card{background:var(--warm-white);border:1px solid rgba(23,50,77,.06);border-radius:var(--radius-md);padding:26px;box-shadow:var(--shadow);}
.process-card__num{
  display:inline-flex;align-items:center;justify-content:center;
  width:32px;height:32px;border-radius:50%;background:var(--sky);color:var(--navy);
  font-weight:800;font-size:13px;margin-bottom:14px;
}
.process-card h3{font-size:17px;margin-bottom:8px;color:var(--text);}
.process-card p{font-size:13.5px;color:var(--text-muted);margin-bottom:16px;line-height:1.7;}
.process-card__icon{color:var(--navy);opacity:.8;}
.process-card__icon svg{width:26px;height:26px;}

/* ---------- english case cards ---------- */
.echo-card{
  background:var(--warm-white);border:1px solid rgba(23,50,77,.06);border-radius:var(--radius-md);
  padding:26px;box-shadow:var(--shadow);
}
.echo-card__meta{font-size:12px;font-weight:700;color:var(--text-muted);margin-bottom:6px;}
.echo-card__category{font-size:15px;font-weight:700;color:var(--text);margin-bottom:14px;}
.echo-card__headline{display:none;}
.echo-card__row{display:flex;align-items:center;gap:10px;padding-top:14px;border-top:1px solid rgba(23,50,77,.08);margin-bottom:14px;}
.echo-card__row-label{font-size:11px;color:var(--text-muted);display:block;margin-bottom:4px;}
.echo-card__tag{text-align:center;font-size:14px;font-weight:800;color:var(--gold);}

/* ---------- english system dark cards ---------- */
.area-card{
  background:var(--warm-white);border:1px solid rgba(23,50,77,.06);border-radius:var(--radius-md);
  padding:26px;box-shadow:var(--shadow);
}
.area-card h3{font-size:17px;margin-bottom:8px;color:var(--text);}
.area-card p{font-size:14px;color:var(--text-muted);}
.banner{
  display:flex;align-items:center;gap:16px;flex-wrap:wrap;
  background:var(--navy);color:var(--white);border-radius:999px;
  padding:20px 32px;margin-top:44px;font-size:15px;font-weight:600;line-height:1.7;
}
.banner__icon{flex:0 0 auto;}
.banner .hl-chip{background:var(--yellow);color:var(--navy);padding:2px 10px;border-radius:6px;font-weight:800;}

/* ---------- two column: why-us list + reviews ---------- */
.split{display:grid;grid-template-columns:1fr 1fr;gap:64px;}
.feature-list__item{
  display:flex;gap:18px;padding:20px 0;border-bottom:1px solid rgba(23,50,77,.08);
}
.feature-list__item:first-child{padding-top:0;}
.feature-list__item h3{font-size:16px;margin-bottom:6px;color:var(--text);}
.feature-list__item p{font-size:14px;color:var(--text-muted);}
.feature-quote{
  border-left:4px solid var(--navy);padding-left:18px;margin-top:24px;
  font-size:16px;font-weight:700;color:var(--text);line-height:1.7;
}
.review-card{background:var(--warm-white);border:1px solid rgba(23,50,77,.06);border-radius:var(--radius-md);padding:26px;box-shadow:var(--shadow);}
.review-card__quote{font-size:15.5px;font-weight:700;color:var(--text);line-height:1.7;margin-bottom:14px;}
.review-card__quote::before{content:"\201C";color:var(--gold);font-size:22px;font-weight:800;margin-right:2px;}
.review-card__author{font-size:13px;font-weight:600;color:var(--text-muted);}

/* ---------- checklist (추천대상) ---------- */
.check-grid{grid-template-columns:repeat(2,1fr);}
.check-item{
  background:var(--warm-white);border:1px solid rgba(23,50,77,.08);border-radius:var(--radius-sm);
  padding:18px 20px;display:flex;align-items:flex-start;gap:12px;font-weight:600;font-size:14.5px;color:var(--text);
}
.check-item__mark{
  flex:0 0 22px;width:22px;height:22px;border-radius:50%;background:var(--navy);
  color:var(--white);display:flex;align-items:center;justify-content:center;font-weight:800;font-size:12px;margin-top:1px;
}

/* ---------- class info ---------- */
.info-bar{
  display:grid;grid-template-columns:repeat(5,1fr);
  background:var(--warm-white);border:1px solid rgba(23,50,77,.08);border-radius:var(--radius-lg);
  padding:32px 12px;box-shadow:var(--shadow);margin-bottom:24px;
}
.info-item{text-align:center;padding:0 12px;border-right:1px solid rgba(23,50,77,.08);}
.info-item:last-child{border-right:none;}
.info-item .icon-circle{margin:0 auto 12px;}
.info-item__label{font-size:12px;color:var(--text-muted);margin-bottom:6px;}
.info-item__value{font-size:15px;font-weight:700;color:var(--text);}
.tip-box{
  background:var(--sky);border-radius:var(--radius-sm);
  padding:20px 24px;font-size:14px;color:var(--navy);line-height:1.8;font-weight:600;
  display:flex;align-items:center;gap:12px;
}
.tip-box strong{font-weight:800;}

/* ---------- final cta ---------- */
.final-cta{background:var(--beige);}
.final-cta__grid{display:grid;grid-template-columns:.85fr 1.15fr;gap:56px;align-items:center;}
.final-cta__photo{
  display:flex;align-items:center;justify-content:center;
}
.final-cta__photo img{width:100%;max-width:280px;border-radius:var(--radius-lg);box-shadow:var(--shadow-md);margin:0 auto;}
.final-cta__title{font-size:clamp(26px,3.6vw,36px);font-weight:800;color:var(--text);line-height:1.45;margin-bottom:18px;}
.final-cta__desc{font-size:15px;color:var(--text-muted);margin-bottom:32px;line-height:1.8;}
.final-cta__btns{display:flex;flex-wrap:wrap;gap:12px;}

/* ---------- footer ---------- */
.footer{background:var(--deep-navy);color:var(--white);padding:48px 0;}
.footer__inner{display:flex;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:24px;}
.footer__brand p{opacity:.6;font-size:13px;margin-top:4px;}
.footer__brand .logo{color:var(--white);font-size:18px;}
.footer__sns{display:flex;gap:20px;}
.footer__sns a{display:flex;align-items:center;gap:6px;font-weight:700;opacity:.85;font-size:14px;}
.footer__sns a:hover{opacity:1;color:var(--sky);}
.footer__sns-icon{width:20px;height:20px;border-radius:6px;display:flex;align-items:center;justify-content:center;background:rgba(255,255,255,.1);flex:0 0 20px;}
.footer__sns-icon svg{width:12px;height:12px;}
.footer__info{text-align:right;font-size:13px;opacity:.65;line-height:1.7;}

/* ---------- floating cta ---------- */
.float-cta{
  position:fixed;bottom:24px;right:24px;z-index:90;
  background:var(--sky);color:var(--navy);font-weight:800;
  padding:15px 24px;border-radius:999px;box-shadow:0 10px 28px rgba(15,37,56,.2);
  font-size:15px;
}

/* ---------- responsive ---------- */
@media (max-width:960px){
  .nav{display:none;}
  .header__cta{display:none;}
  .hamburger{display:flex;}
  .hero__grid{grid-template-columns:1fr;gap:56px;}
  .hero{padding:130px 0 70px;}
  .philosophy__grid{grid-template-columns:1fr;}
  .philosophy__graphic{height:180px;}
  .split{grid-template-columns:1fr;gap:48px;}
  .grid--5,.grid--4{grid-template-columns:repeat(2,1fr);}
  .grid--3,.grid--2{grid-template-columns:1fr;}
  .video-grid{grid-template-columns:1fr;}
  .process-row{grid-template-columns:1fr;gap:14px;}
  .process-arrow{display:none;}
  .check-grid{grid-template-columns:1fr;}
  .info-bar{grid-template-columns:repeat(2,1fr);row-gap:24px;}
  .info-item{border-right:none;border-bottom:1px solid rgba(23,50,77,.08);padding-bottom:20px;}
  .info-item:nth-last-child(-n+2){border-bottom:none;}
  .final-cta__grid{grid-template-columns:1fr;}
  .final-cta__photo{max-width:320px;margin:0 auto;}
  .footer__inner{flex-direction:column;text-align:center;}
  .footer__info{text-align:center;}
  .hero__preview{position:static;width:100%;margin-top:20px;}
}
@media (max-width:600px){
  .grid--5,.grid--4,.grid--3,.grid--2{grid-template-columns:1fr;}
  .section{padding:80px 0;}
  .philosophy{padding:80px 0;}
  .hero__btns{flex-direction:column;align-items:stretch;}
  .hero__btns .btn{width:100%;}
  .final-cta__btns{flex-direction:column;align-items:stretch;}
  .final-cta__btns .btn{width:100%;}
  .hero__stats{gap:16px;justify-content:space-between;}
  .hero__stat{width:auto;flex:1 1 40%;}
}

@media (max-width:960px){
  .nav.nav--open{
    display:flex;position:fixed;top:80px;left:0;right:0;background:var(--warm-white);
    flex-direction:column;padding:20px 24px;gap:0;border-bottom:1px solid rgba(15,37,56,.08);
  }
  .nav.nav--open a{padding:14px 0;border-bottom:1px solid rgba(15,37,56,.06);}
}