/* ==================== Variables ==================== */
:root{
  --navy:#123a63;
  --green:#1e8449;
  --green-dark:#146c3a;
  --green-light:#e8f6ec;
  --orange:#ef6c2c;
  --orange-dark:#d84315;
  --sky-top:#eaf6fb;
  --sky-bot:#dcefe0;
  --text:#22303f;
  --text-mute:#5b6b7a;
  --border:#e3e9ee;
  --card-bg:#ffffff;
  --header-h:72px;
  --max-w:1120px;
  --radius:16px;
  --shadow:0 8px 24px rgba(18,58,99,.08);
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  font-family:"Pretendard","Apple SD Gothic Neo","Malgun Gothic",-apple-system,BlinkMacSystemFont,sans-serif;
  color:var(--text);
  background:#fff;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;}
h1,h2,h3,h4,p,ul{margin:0;}
ul{padding:0;list-style:none;}
.container{max-width:var(--max-w);margin:0 auto;padding:0 24px;}

/* section anchors sit below fixed header */
section[id]{scroll-margin-top:var(--header-h);}

/* ==================== Header ==================== */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:100;
  height:var(--header-h);
  background:rgba(255,255,255,.92);
  backdrop-filter:blur(8px);
  border-bottom:1px solid transparent;
  transition:border-color .2s, box-shadow .2s;
}
.site-header.scrolled{
  border-bottom-color:var(--border);
  box-shadow:0 2px 12px rgba(18,58,99,.06);
}
.header-inner{
  max-width:var(--max-w);
  margin:0 auto;
  height:var(--header-h);
  padding:0 24px;
  display:flex;align-items:center;gap:28px;
}
.brand{display:flex;align-items:center;gap:8px;font-weight:800;font-size:17px;color:var(--navy);white-space:nowrap;}
.brand-icon{width:26px;height:26px;}
.main-nav{display:flex;gap:26px;flex:1;}
.nav-link{font-size:15px;font-weight:600;color:var(--text);padding:6px 2px;position:relative;white-space:nowrap;}
.nav-link::after{
  content:"";position:absolute;left:0;bottom:-4px;width:0;height:2px;background:var(--green);
  transition:width .2s;
}
.nav-link:hover::after,.nav-link.active::after{width:100%;}
.nav-link.active{color:var(--green-dark);}
.cta-btn{
  display:flex;align-items:center;gap:6px;
  background:var(--green);color:#fff;font-weight:700;font-size:14px;
  padding:10px 18px;border-radius:999px;white-space:nowrap;
  box-shadow:0 4px 12px rgba(30,132,73,.28);
  transition:background .2s, transform .2s;
}
.cta-btn:hover{background:var(--green-dark);transform:translateY(-1px);}
.hamburger{display:none;flex-direction:column;justify-content:center;gap:5px;width:32px;height:32px;background:none;border:0;cursor:pointer;padding:0;}
.hamburger span{display:block;width:100%;height:2px;background:var(--navy);border-radius:2px;transition:.25s;}
.mobile-nav{
  display:none;
  flex-direction:column;
  background:#fff;
  border-top:1px solid var(--border);
  padding:8px 24px 16px;
}
.mobile-nav .nav-link{padding:12px 4px;border-bottom:1px solid var(--border);font-size:16px;}
.mobile-nav .nav-link:last-child{border-bottom:0;}
.site-header.open .mobile-nav{display:flex;}
.site-header.open .hamburger span:nth-child(1){transform:translateY(7px) rotate(45deg);}
.site-header.open .hamburger span:nth-child(2){opacity:0;}
.site-header.open .hamburger span:nth-child(3){transform:translateY(-7px) rotate(-45deg);}

/* ==================== Hero ==================== */
.hero{
  position:relative;
  padding:calc(var(--header-h) + 64px) 24px 72px;
  overflow:hidden;
  text-align:center;
  color:#fff;
}
.hero-bg{
  position:absolute;inset:0;z-index:0;
  background:
    radial-gradient(circle at 15% 20%,rgba(255,255,255,.12),transparent 45%),
    radial-gradient(circle at 85% 0%,rgba(255,255,255,.10),transparent 40%),
    linear-gradient(155deg,#1a4f82 0%,#146c3a 55%,#0f5c33 100%);
}
.hero-inner{position:relative;z-index:1;max-width:760px;margin:0 auto;}
.hero-eyebrow{
  display:inline-block;font-size:14px;font-weight:700;letter-spacing:.02em;
  background:rgba(255,255,255,.15);padding:8px 18px;border-radius:999px;margin-bottom:20px;
}
.hero-title{font-size:clamp(28px,5.4vw,48px);font-weight:900;line-height:1.32;margin-bottom:28px;}
.hero-title .accent{color:#a8e6b5;}
.hero-title .accent-orange{color:#ffb27a;}
.hero-title-img-wrap{margin:0 0 28px;}
.hero-title-img{
  display:block;width:100%;max-width:560px;margin:0 auto;
  border-radius:20px;box-shadow:0 18px 44px rgba(0,0,0,.28);
}
.hero-facts{display:flex;flex-wrap:wrap;justify-content:center;gap:14px 28px;margin-bottom:24px;}
.hero-fact{display:flex;align-items:center;gap:8px;font-size:15px;font-weight:600;color:#eef6f0;}
.dday-badge{
  display:inline-block;background:rgba(255,255,255,.92);color:var(--green-dark);
  font-weight:800;font-size:15px;padding:10px 22px;border-radius:999px;margin-bottom:30px;
  box-shadow:0 6px 18px rgba(0,0,0,.15);
}
.hero-buttons{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;}
.btn{padding:14px 28px;border-radius:999px;font-weight:700;font-size:15px;transition:.2s;}
.btn-primary{background:var(--orange);color:#fff;box-shadow:0 8px 20px rgba(239,108,44,.4);}
.btn-primary:hover{background:var(--orange-dark);transform:translateY(-2px);}
.btn-outline{border:2px solid rgba(255,255,255,.75);color:#fff;}
.btn-outline:hover{background:rgba(255,255,255,.15);}

/* ==================== Sections ==================== */
.section{padding:80px 0;}
.section-alt{background:linear-gradient(180deg,var(--sky-top),var(--sky-bot) 60%,#fff);}
.section-eyebrow{color:var(--green);font-weight:800;letter-spacing:.08em;font-size:13px;margin-bottom:10px;}
.section-title{font-size:clamp(24px,3.4vw,32px);font-weight:900;color:var(--navy);margin-bottom:14px;}
.section-desc{color:var(--text-mute);font-size:16px;max-width:760px;margin-bottom:36px;}
.sub-title{font-size:19px;font-weight:800;color:var(--navy);margin:48px 0 18px;}
.section-note{color:var(--text-mute);font-size:13.5px;margin-top:16px;}

/* info grid */
.info-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-bottom:30px;}
.info-card{background:var(--card-bg);border:1px solid var(--border);border-radius:var(--radius);padding:20px 22px;box-shadow:var(--shadow);}
.info-label{display:inline-block;font-size:12.5px;font-weight:800;color:var(--green);background:var(--green-light);padding:4px 10px;border-radius:6px;margin-bottom:10px;}
.info-value{font-size:15.5px;font-weight:700;color:var(--text);}
.info-value small{display:block;font-weight:500;color:var(--text-mute);font-size:13px;margin-top:4px;}

.highlight-box{
  background:linear-gradient(120deg,var(--green-light),#fff6ea);
  border:1px solid #cfe9d6;border-radius:var(--radius);
  padding:22px 26px;margin-bottom:36px;
}
.highlight-box h3{font-size:16.5px;font-weight:800;color:var(--green-dark);margin-bottom:6px;}
.highlight-box p{font-size:14.5px;color:var(--text);}

.content-blocks{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;}
.content-block{background:var(--card-bg);border:1px solid var(--border);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow);}
.content-block h4{color:var(--navy);font-size:16px;font-weight:800;margin-bottom:8px;}
.content-block p{font-size:14px;color:var(--text-mute);}

/* timeline */
.timeline{display:flex;flex-direction:column;gap:14px;}
.timeline-group{background:var(--card-bg);border:1px solid var(--border);border-radius:var(--radius);padding:22px 24px;box-shadow:var(--shadow);}
.timeline-group.featured{border-color:#bfe3cb;background:linear-gradient(120deg,#f3fbf5,#fff);}
.timeline-group-head{display:flex;align-items:center;gap:10px;font-weight:800;font-size:16.5px;color:var(--navy);margin-bottom:14px;}
.time-range{margin-left:auto;font-size:13.5px;font-weight:700;color:var(--green-dark);background:var(--green-light);padding:4px 12px;border-radius:999px;}
.dot{width:11px;height:11px;border-radius:50%;flex:none;}
.dot-gray{background:#9aa7b3;}
.dot-blue{background:#3182ce;}
.dot-green{background:var(--green);}
.dot-orange{background:var(--orange);}
.timeline-list li{position:relative;padding-left:16px;font-size:14.5px;color:var(--text);margin-bottom:8px;}
.timeline-list li:last-child{margin-bottom:0;}
.timeline-list li::before{content:"";position:absolute;left:0;top:9px;width:5px;height:5px;border-radius:50%;background:#c3ccd5;}
.timeline-list small{color:var(--text-mute);}

/* program layout images */
.layout-wrap{display:grid;grid-template-columns:1.15fr 1fr;gap:20px;margin-bottom:12px;}
.layout-figure{background:var(--card-bg);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);}
.layout-figure img{width:100%;height:280px;object-fit:cover;}
.layout-figure figcaption{padding:14px 18px;font-size:13px;color:var(--text-mute);}

/* booth filter + grid */
.booth-filter{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:20px;}
.filter-chip{
  border:1px solid var(--border);background:#fff;color:var(--text-mute);
  font-size:13.5px;font-weight:700;padding:9px 18px;border-radius:999px;cursor:pointer;transition:.2s;
}
.filter-chip:hover{border-color:var(--green);color:var(--green-dark);}
.filter-chip.active{background:var(--green);border-color:var(--green);color:#fff;}
.booth-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;}
.booth-card{background:var(--card-bg);border:1px solid var(--border);border-radius:12px;padding:16px 18px;box-shadow:var(--shadow);}
.booth-card .num{font-size:12px;font-weight:800;color:var(--green);}
.booth-card .org{font-size:14px;font-weight:800;color:var(--navy);margin:6px 0 4px;}
.booth-card .desc{font-size:12.5px;color:var(--text-mute);line-height:1.5;}

/* edu card */
.edu-card{background:var(--card-bg);border:1px solid var(--border);border-radius:var(--radius);padding:26px;box-shadow:var(--shadow);}
.edu-meta{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-bottom:20px;}
.edu-meta p{font-weight:700;font-size:14.5px;margin-top:8px;}
.table-wrap{overflow-x:auto;}
.edu-table{width:100%;border-collapse:collapse;font-size:14px;min-width:480px;}
.edu-table th,.edu-table td{padding:12px 14px;text-align:left;border-bottom:1px solid var(--border);}
.edu-table th{color:var(--navy);font-weight:800;background:var(--green-light);}
.edu-table td{color:var(--text);}

/* map / location */
.map-wrap{border-radius:var(--radius);overflow:hidden;border:1px solid var(--border);box-shadow:var(--shadow);margin-bottom:20px;}
.location-links{display:flex;gap:12px;flex-wrap:wrap;margin-bottom:36px;}
.map-btn{border:1.5px solid var(--green);color:var(--green-dark);font-weight:700;font-size:14px;padding:10px 20px;border-radius:999px;transition:.2s;}
.map-btn:hover{background:var(--green);color:#fff;}
.transport-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;}
.transport-card{background:var(--card-bg);border:1px solid var(--border);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow);}
.transport-card h4{font-size:15.5px;font-weight:800;color:var(--navy);margin-bottom:10px;}
.transport-card p{font-size:13.8px;color:var(--text-mute);}

/* contact */
.contact-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-bottom:8px;}
.contact-card{background:var(--card-bg);border:1px solid var(--border);border-radius:var(--radius);padding:24px;text-align:center;box-shadow:var(--shadow);}
.contact-card h4{color:var(--navy);font-size:16px;font-weight:800;margin-bottom:8px;}
.contact-card p{font-size:13.5px;color:var(--text-mute);}

/* footer */
.site-footer{background:var(--navy);color:#c9d7e3;padding:44px 0 30px;}
.footer-inner{text-align:center;}
.footer-logos{max-width:420px;margin:0 auto 18px;filter:brightness(1.05);background:#fff;border-radius:10px;padding:10px 16px;}
.footer-text{font-size:13.5px;margin-bottom:6px;}
.footer-copy{font-size:12px;color:#8ea3b8;}

/* scroll top */
.scroll-top{
  position:fixed;right:22px;bottom:22px;z-index:90;
  width:44px;height:44px;border-radius:50%;
  background:var(--green);color:#fff;font-size:18px;font-weight:700;
  display:flex;align-items:center;justify-content:center;
  box-shadow:0 8px 20px rgba(0,0,0,.2);
  opacity:0;pointer-events:none;transform:translateY(10px);
  transition:.25s;
}
.scroll-top.show{opacity:1;pointer-events:auto;transform:translateY(0);}

/* ==================== Responsive ==================== */
@media (max-width:960px){
  .main-nav{display:none;}
  .hamburger{display:flex;}
  .info-grid,.content-blocks,.transport-grid,.contact-grid{grid-template-columns:repeat(2,1fr);}
  .booth-grid{grid-template-columns:repeat(2,1fr);}
  .layout-wrap{grid-template-columns:1fr;}
  .edu-meta{grid-template-columns:repeat(2,1fr);}
}
@media (max-width:560px){
  .header-inner{padding:0 16px;gap:12px;}
  .brand span{display:none;}
  .cta-btn span{display:none;}
  .cta-btn{padding:10px 12px;}
  .container{padding:0 18px;}
  .info-grid,.content-blocks,.transport-grid,.contact-grid,.booth-grid,.edu-meta{grid-template-columns:1fr;}
  .hero{padding:calc(var(--header-h) + 40px) 18px 56px;}
  .section{padding:56px 0;}
}