/* =========================================================
   TOP EDU PREP — Apple / iPad Product-Page Design System
   Type: SF Pro system stack (display + text) + IBM Plex Mono (data)
   Palette: White / Light Gray / Deep Black / Apple Blue accent
   ========================================================= */
:root{
  --navy-900:#1D1D1F;   /* primary text / dark surfaces */
  --navy-800:#2C2C2E;
  --navy-700:#3A3A3C;
  --navy-600:#48484A;
  --gold-500:#0071E3;   /* accent blue */
  --gold-400:#2997FF;   /* light accent blue */
  --gold-100:#E8F1FD;   /* pale blue tint */
  --cream:#F5F5F7;      /* app light gray bg */
  --cream-2:#FBFBFD;
  --ink:#1D1D1F;
  --ink-soft:#6E6E73;
  --white:#FFFFFF;
  --line:rgba(0,0,0,0.08);
  --shadow: 0 20px 45px -18px rgba(0,0,0,0.16);
  --radius-s:12px;
  --radius-m:22px;
  --maxw:1180px;
  --sf: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'SF Pro Text', 'Helvetica Neue', 'Noto Sans KR', Pretendard, sans-serif;
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--white);
  color:var(--ink);
  font-family:var(--sf);
  font-size:17px;
  line-height:1.55;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4{
  font-family:var(--sf);
  font-weight:700;
  color:var(--navy-900);
  line-height:1.08;
  letter-spacing:-0.02em;
  margin:0 0 .5em;
}
h1{font-size:clamp(2.6rem,5.6vw,4.4rem); font-weight:700;}
h2{font-size:clamp(1.9rem,3.4vw,2.9rem);}
h3{font-size:1.3rem; letter-spacing:-0.01em;}
p{margin:0 0 1em; color:var(--ink-soft); font-weight:400;}
a{color:inherit; text-decoration:none;}
.mono{font-family:'IBM Plex Mono',monospace; letter-spacing:.01em;}
.eyebrow{
  font-family:var(--sf);
  font-size:.82rem;
  font-weight:600;
  letter-spacing:.01em;
  color:var(--gold-500);
  display:inline-block;
  margin-bottom:.9em;
}
.wrap{max-width:var(--maxw); margin:0 auto; padding:0 28px;}
img{max-width:100%; display:block;}
.skip-link{position:absolute; left:-9999px; top:0; background:var(--navy-900); color:var(--white); padding:10px 16px; z-index:999; border-radius:0 0 10px 0;}
.skip-link:focus{left:12px; top:12px;}

/* ---------- Top notice bar ---------- */
.notice-bar{
  background:var(--navy-900); color:rgba(255,255,255,.82);
  font-family:var(--sf); font-size:.8rem; font-weight:500;
}
.notice-bar .wrap{display:flex; align-items:center; justify-content:space-between; padding:9px 28px; flex-wrap:wrap; gap:6px;}
.notice-bar a{color:var(--gold-400); font-weight:600;}
.notice-bar .ddays{display:flex; gap:18px; flex-wrap:wrap;}
.notice-bar .ddays span b{color:var(--white); font-weight:600;}

/* ---------- Header / nav (glassmorphism) ---------- */
header.site{
  background:rgba(255,255,255,.72);
  backdrop-filter:saturate(180%) blur(20px);
  -webkit-backdrop-filter:saturate(180%) blur(20px);
  border-bottom:1px solid var(--line);
  position:sticky; top:0; z-index:50;
}
.nav-row{display:flex; align-items:center; justify-content:space-between; padding:13px 28px; max-width:var(--maxw); margin:0 auto;}
.brand{display:flex; align-items:center; gap:10px;}
.brand .mark{
  width:36px;height:36px;border-radius:11px;
  background:linear-gradient(145deg,#0071E3,#2997FF);
  display:flex;align-items:center;justify-content:center;
  color:var(--white); font-family:var(--sf); font-weight:700; font-size:.92rem;
}
.brand .word{font-family:var(--sf); font-weight:700; font-size:1.08rem; color:var(--navy-900); letter-spacing:-0.01em;}
.brand .word small{display:block; font-family:var(--sf); font-size:.62rem; letter-spacing:.06em; color:var(--ink-soft); font-weight:500; margin-top:1px;}

nav.primary ul{list-style:none; display:flex; gap:26px; margin:0; padding:0;}
nav.primary a{
  font-family:var(--sf); font-size:.87rem; font-weight:500;
  color:var(--ink-soft); position:relative; padding:6px 0;
  transition:color .2s;
}
nav.primary a:hover{color:var(--navy-900);}
nav.primary a.active{color:var(--navy-900); font-weight:600;}

.nav-cta{
  display:inline-flex; align-items:center; gap:6px;
  background:var(--gold-500); color:var(--white)!important;
  padding:9px 20px; border-radius:999px; font-family:var(--sf); font-size:.85rem; font-weight:600;
  white-space:nowrap; transition:background .2s, transform .2s;
}
.nav-cta:hover{background:#0077ED; transform:translateY(-1px);}
.burger{display:none; background:none; border:none; cursor:pointer; padding:6px;}
.burger span{display:block; width:22px; height:2px; background:var(--navy-900); margin:5px 0; border-radius:2px;}

@media (max-width:920px){
  nav.primary{position:fixed; inset:0 0 0 26%; background:rgba(29,29,31,.97); backdrop-filter:blur(10px); transform:translateX(100%); transition:transform .32s cubic-bezier(.4,0,.2,1); z-index:60; padding:90px 30px;}
  nav.primary.open{transform:translateX(0);}
  nav.primary ul{flex-direction:column; gap:22px;}
  nav.primary a{color:rgba(255,255,255,.92); font-size:1.05rem;}
  .nav-cta{display:none;}
  .burger{display:block;}
}

/* ---------- Buttons (pill, Apple-style) ---------- */
.btn{
  display:inline-flex; align-items:center; gap:8px;
  padding:13px 26px; border-radius:999px;
  font-family:var(--sf); font-size:.9rem; font-weight:600;
  border:1px solid transparent; cursor:pointer; transition:all .2s;
}
.btn-primary{background:var(--gold-500); color:var(--white);}
.btn-primary:hover{background:#0077ED; transform:translateY(-1px);}
.btn-outline{background:transparent; color:var(--gold-500); border-color:var(--gold-500);}
.btn-outline:hover{background:var(--gold-500); color:var(--white);}
.btn-gold{background:var(--white); color:var(--navy-900); border-color:transparent;}
.btn-gold:hover{background:var(--gold-100); transform:translateY(-1px);}

/* ---------- Hero (gradient mesh, dark) ---------- */
.hero{
  background:
    radial-gradient(900px 500px at 15% -10%, rgba(41,151,255,.35), transparent 60%),
    radial-gradient(800px 500px at 90% 0%, rgba(191,90,242,.28), transparent 55%),
    radial-gradient(700px 400px at 60% 100%, rgba(0,113,227,.25), transparent 60%),
    #000000;
  color:var(--white);
  padding:110px 0 88px;
  position:relative; overflow:hidden;
}
.hero .wrap{display:grid; grid-template-columns:1.1fr .9fr; gap:56px; align-items:center;}
.hero h1{color:var(--white);}
.hero h1 em{
  font-style:normal;
  background:linear-gradient(90deg,#2997FF,#BF5AF2);
  -webkit-background-clip:text; background-clip:text; color:transparent;
}
.hero p.lead{color:rgba(255,255,255,.72); font-size:1.12rem; max-width:46ch; font-weight:400;}
.hero .cta-row{display:flex; gap:14px; margin-top:30px; flex-wrap:wrap;}
.hero .btn-outline{border-color:rgba(255,255,255,.4); color:var(--white);}
.hero .btn-outline:hover{background:rgba(255,255,255,.12); border-color:rgba(255,255,255,.6);}

.hero-rhythm{
  background:rgba(255,255,255,.06);
  border:1px solid rgba(255,255,255,.14);
  border-radius:var(--radius-m);
  padding:28px;
  backdrop-filter:blur(20px);
}
.hero-rhythm .eyebrow{color:var(--gold-400);}
.rhythm-step{display:flex; gap:14px; padding:13px 0; border-bottom:1px solid rgba(255,255,255,.08);}
.rhythm-step:last-child{border-bottom:none;}
.rhythm-step .t{font-family:var(--sf); color:var(--gold-400); font-size:.72rem; font-weight:700; letter-spacing:.04em; min-width:64px;}
.rhythm-step .d strong{color:var(--white); display:block; font-size:.96rem; margin-bottom:2px; font-weight:600;}
.rhythm-step .d span{color:rgba(255,255,255,.6); font-size:.84rem;}

@media(max-width:920px){.hero .wrap{grid-template-columns:1fr;}}

/* ---------- Section shells ---------- */
section{padding:88px 0;}
section.tight{padding:56px 0;}
.section-head{max-width:640px; margin-bottom:46px;}
.section-head.center{margin-left:auto; margin-right:auto; text-align:center;}
.bg-navy{background:#000000; color:var(--white);}
.bg-navy h2, .bg-navy h3{color:var(--white);}
.bg-navy p{color:rgba(255,255,255,.68);}
.bg-cream2{background:var(--cream);}

/* ---------- Cards / grids ---------- */
.grid-3{display:grid; grid-template-columns:repeat(3,1fr); gap:20px;}
.grid-2{display:grid; grid-template-columns:repeat(2,1fr); gap:20px;}
.grid-4{display:grid; grid-template-columns:repeat(4,1fr); gap:18px;}
@media(max-width:920px){.grid-3,.grid-4{grid-template-columns:repeat(2,1fr);} .grid-2{grid-template-columns:1fr;}}
@media(max-width:600px){.grid-3,.grid-4{grid-template-columns:1fr;}}

.card{
  background:var(--white); border:1px solid var(--line); border-radius:var(--radius-m);
  padding:30px; transition:transform .25s cubic-bezier(.4,0,.2,1), box-shadow .25s;
}
.card:hover{transform:translateY(-5px); box-shadow:var(--shadow);}
.card .tag{font-family:var(--sf); font-size:.72rem; font-weight:700; letter-spacing:.04em; color:var(--gold-500); text-transform:uppercase;}
.card h3{margin-top:8px;}

.num{
  font-family:var(--sf); font-size:.85rem; font-weight:700; color:var(--white);
  background:linear-gradient(145deg,#0071E3,#2997FF);
  border-radius:50%; width:32px; height:32px;
  display:inline-flex; align-items:center; justify-content:center; margin-bottom:14px;
}

/* ---------- Table ---------- */
table{width:100%; border-collapse:collapse; background:var(--white); border-radius:var(--radius-m); overflow:hidden;}
th,td{padding:16px 18px; text-align:left; border-bottom:1px solid var(--line); font-size:.92rem;}
th{background:var(--cream); color:var(--navy-900); font-family:var(--sf); font-size:.76rem; font-weight:700; letter-spacing:.03em; text-transform:uppercase;}
tr:last-child td{border-bottom:none;}
.table-wrap{overflow-x:auto; box-shadow:var(--shadow); border-radius:var(--radius-m);}

/* ---------- D-day chips ---------- */
.dday-strip{display:flex; gap:14px; flex-wrap:wrap;}
.dday-chip{
  background:var(--white); border:1px solid var(--line); border-radius:var(--radius-m);
  padding:20px 22px; min-width:170px; box-shadow:var(--shadow);
}
.dday-chip .exam{font-family:var(--sf); font-size:.72rem; font-weight:700; letter-spacing:.03em; color:var(--gold-500); text-transform:uppercase;}
.dday-chip .date{font-size:1rem; color:var(--navy-900); font-weight:600; margin:4px 0;}
.dday-chip .count{font-family:'IBM Plex Mono',monospace; font-size:1.5rem; color:var(--navy-900); font-weight:600;}
.dday-chip .count span{font-size:.7rem; color:var(--ink-soft); font-weight:400;}

/* ---------- Timeline (daily rhythm / process) ---------- */
.flow{display:flex; gap:0; overflow-x:auto; padding-bottom:10px;}
.flow-step{flex:1 0 210px; position:relative; padding:0 22px 0 0;}
.flow-step:not(:last-child)::after{content:'→'; position:absolute; right:-4px; top:24px; color:var(--gold-500); font-weight:700;}
.flow-step .fnum{font-family:var(--sf); color:var(--gold-500); font-size:.8rem; font-weight:700;}

/* ---------- Testimonials ---------- */
.quote-card{background:var(--white); border:1px solid var(--line); border-radius:var(--radius-m); padding:28px;}
.quote-card .stars{color:var(--gold-500); letter-spacing:2px; font-size:.85rem; margin-bottom:10px;}
.quote-card p.q{color:var(--ink); font-weight:400;}
.quote-card .who{font-family:var(--sf); font-size:.78rem; font-weight:600; color:var(--ink-soft); margin-top:16px;}

/* ---------- Campus cards ---------- */
.campus-card{background:var(--white); border:1px solid var(--line); border-radius:var(--radius-m); overflow:hidden;}
.campus-head{background:linear-gradient(145deg,#111,#000); color:var(--white); padding:22px 26px;}
.campus-head .eyebrow{color:var(--gold-400);}
.campus-body{padding:22px 26px;}
.campus-body .line{display:flex; gap:10px; padding:9px 0; border-bottom:1px solid var(--line); font-size:.9rem;}
.campus-body .line:last-child{border-bottom:none;}
.campus-body .line b{font-family:var(--sf); font-size:.72rem; font-weight:700; letter-spacing:.03em; color:var(--gold-500); min-width:64px; text-transform:uppercase;}

/* ---------- FAQ ---------- */
details.faq{background:var(--white); border:1px solid var(--line); border-radius:var(--radius-s); padding:18px 22px; margin-bottom:12px;}
details.faq summary{cursor:pointer; font-family:var(--sf); font-weight:600; color:var(--navy-900); list-style:none; display:flex; justify-content:space-between; align-items:center;}
details.faq summary::-webkit-details-marker{display:none;}
details.faq summary::after{content:'+'; font-family:var(--sf); color:var(--gold-500); font-size:1.3rem; font-weight:300;}
details.faq[open] summary::after{content:'–';}
details.faq p{margin-top:12px; margin-bottom:0;}

/* ---------- Form ---------- */
.form-panel{background:var(--white); border:1px solid var(--line); border-radius:var(--radius-m); padding:34px; box-shadow:var(--shadow);}
.form-row{display:grid; grid-template-columns:1fr 1fr; gap:16px; margin-bottom:16px;}
@media(max-width:600px){.form-row{grid-template-columns:1fr;}}
label{display:block; font-family:var(--sf); font-size:.78rem; font-weight:600; color:var(--ink-soft); margin-bottom:6px;}
input,select,textarea{
  width:100%; padding:13px 16px; border:1px solid var(--line); border-radius:var(--radius-s);
  font-family:var(--sf); font-size:.95rem; background:var(--cream); color:var(--ink);
}
textarea{min-height:110px; resize:vertical;}
input:focus,select:focus,textarea:focus{outline:2px solid var(--gold-500); outline-offset:1px; background:var(--white);}

/* ---------- Footer ---------- */
footer.site{background:#000000; color:rgba(255,255,255,.62); padding:60px 0 26px;}
footer.site h4{color:rgba(255,255,255,.92); font-family:var(--sf); font-size:.82rem; font-weight:700; margin-bottom:16px;}
.footer-grid{display:grid; grid-template-columns:1.4fr 1fr 1fr 1fr; gap:32px;}
footer.site a{display:block; padding:5px 0; font-size:.86rem; color:rgba(255,255,255,.6); transition:color .2s;}
footer.site a:hover{color:var(--gold-400);}
.footer-bottom{border-top:1px solid rgba(255,255,255,.14); margin-top:40px; padding-top:20px; display:flex; justify-content:space-between; flex-wrap:wrap; gap:10px; font-family:var(--sf); font-size:.76rem; color:rgba(255,255,255,.42);}
@media(max-width:920px){.footer-grid{grid-template-columns:1fr 1fr;}}

/* ---------- Breadcrumb / page header ---------- */
.page-head{
  background:
    radial-gradient(700px 400px at 20% -20%, rgba(41,151,255,.18), transparent 60%),
    radial-gradient(700px 400px at 90% 10%, rgba(191,90,242,.14), transparent 60%),
    var(--cream);
  color:var(--ink);
  padding:70px 0 50px;
}
.page-head .eyebrow{color:var(--gold-500);}
.page-head h1{color:var(--navy-900); font-size:clamp(2.1rem,3.8vw,3.1rem);}
.page-head p{color:var(--ink-soft); max-width:60ch; font-size:1.05rem;}

/* ---------- Utility ---------- */
.center{text-align:center;}
.mt-0{margin-top:0;}
.badge{display:inline-block; background:var(--gold-100); color:var(--gold-500); font-family:var(--sf); font-size:.72rem; font-weight:700; padding:6px 12px; border-radius:999px; margin-right:6px;}
.divider{height:1px; background:var(--line); margin:50px 0;}
@media print{.notice-bar,header.site,footer.site,.no-print{display:none!important;}}