/* ============================================================
   SEA Lab — Smart Energy & Automation Laboratory
   공통 스타일시트
   ============================================================ */

:root{
  --navy:#0d2c54;
  --navy-2:#143a6b;
  --navy-3:#1b4d8c;
  --accent:#00a97f;
  --accent-2:#00c896;
  --gold:#c8a24a;
  --ink:#1c2430;
  --gray:#5b6675;
  --gray-2:#8b95a3;
  --line:#e3e8ef;
  --bg:#ffffff;
  --bg-soft:#f6f8fb;
  --bg-soft-2:#eef2f7;
  --radius:10px;
  --maxw:1200px;
  --shadow:0 2px 14px rgba(13,44,84,.07);
  --shadow-lg:0 10px 40px rgba(13,44,84,.13);
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:"Pretendard","Noto Sans KR","Malgun Gothic","맑은 고딕",-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  color:var(--ink);
  background:var(--bg);
  line-height:1.7;
  font-size:16px;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button{font-family:inherit}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px}

/* ---------- 상단 유틸바 ---------- */
.topbar{background:var(--navy);color:#c9d6e8;font-size:13px}
.topbar .wrap{display:flex;justify-content:space-between;align-items:center;height:36px}
.topbar a{opacity:.85;margin-left:18px}
.topbar a:hover{opacity:1;color:#fff}
.topbar .dept{letter-spacing:.02em}

/* ---------- 헤더 / 네비 ---------- */
.site-header{
  position:sticky;top:0;z-index:100;background:#fff;
  border-bottom:1px solid var(--line);
}
.site-header.scrolled{box-shadow:var(--shadow)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:78px}

.logo{display:flex;align-items:center;gap:12px}
.logo-mark{
  width:46px;height:46px;border-radius:11px;flex:0 0 46px;
  background:linear-gradient(135deg,var(--navy) 0%,var(--navy-3) 55%,var(--accent) 100%);
  color:#fff;display:flex;align-items:center;justify-content:center;
  font-weight:800;font-size:15px;letter-spacing:.06em;
  box-shadow:0 3px 10px rgba(13,44,84,.25);
}
.logo-txt strong{display:block;font-size:19px;font-weight:800;color:var(--navy);letter-spacing:-.02em;line-height:1.25}
.logo-txt span{display:block;font-size:11.5px;color:var(--gray-2);letter-spacing:.04em;text-transform:uppercase}

/* 메인 메뉴 */
.gnb{display:flex;align-items:stretch;height:78px}
.gnb > li{position:relative;display:flex;align-items:center}
.gnb > li > a{
  padding:0 20px;font-weight:600;font-size:16.5px;color:var(--ink);
  height:100%;display:flex;align-items:center;position:relative;letter-spacing:-.01em;
}
.gnb > li > a::after{
  content:"";position:absolute;left:20px;right:20px;bottom:22px;height:2px;
  background:var(--accent);transform:scaleX(0);transition:transform .22s;
}
.gnb > li:hover > a::after,
.gnb > li.active > a::after{transform:scaleX(1)}
.gnb > li:hover > a,.gnb > li.active > a{color:var(--navy)}

.submenu{
  position:absolute;top:78px;left:50%;transform:translateX(-50%) translateY(-6px);
  min-width:190px;background:#fff;border:1px solid var(--line);border-radius:8px;
  box-shadow:var(--shadow-lg);padding:8px;opacity:0;visibility:hidden;transition:.2s;
}
.gnb > li:hover .submenu{opacity:1;visibility:visible;transform:translateX(-50%) translateY(0)}
.submenu a{display:block;padding:9px 14px;font-size:14.5px;color:var(--gray);border-radius:6px}
.submenu a:hover{background:var(--bg-soft);color:var(--navy);font-weight:600}

.nav-toggle{display:none;background:none;border:0;font-size:26px;color:var(--navy);cursor:pointer;padding:6px}

/* ---------- 페이지 히어로 ---------- */
.page-hero{
  background:linear-gradient(120deg,var(--navy) 0%,var(--navy-3) 100%);
  color:#fff;padding:64px 0 58px;position:relative;overflow:hidden;
}
.page-hero::after{
  content:"";position:absolute;right:-90px;top:-90px;width:340px;height:340px;border-radius:50%;
  background:radial-gradient(circle,rgba(0,169,127,.35),transparent 68%);
}
.page-hero h1{margin:0 0 8px;font-size:38px;font-weight:800;letter-spacing:-.03em}
.page-hero p{margin:0;color:#b9cbe2;font-size:15.5px}
.breadcrumb{font-size:13px;color:#9fb6d3;margin-bottom:14px}
.breadcrumb span{margin:0 7px;opacity:.55}

/* ---------- 섹션 공통 ---------- */
.section{padding:74px 0}
.section.soft{background:var(--bg-soft)}
.section-head{text-align:center;margin-bottom:44px}
.section-head .eyebrow{
  color:var(--accent);font-weight:700;font-size:13px;letter-spacing:.16em;
  text-transform:uppercase;display:block;margin-bottom:10px;
}
.section-head h2{margin:0 0 12px;font-size:31px;font-weight:800;color:var(--navy);letter-spacing:-.03em}
.section-head p{margin:0;color:var(--gray);font-size:15.5px}
.section-head.left{text-align:left}

h3.block-title{
  font-size:21px;font-weight:800;color:var(--navy);margin:0 0 18px;
  padding-left:14px;border-left:4px solid var(--accent);letter-spacing:-.02em;
}

/* ---------- 카드 / 그리드 ---------- */
.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)}

.card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:26px;transition:.22s;
}
.card:hover{border-color:#c9d7ea;box-shadow:var(--shadow);transform:translateY(-3px)}
.card .ico{
  width:48px;height:48px;border-radius:12px;background:var(--bg-soft-2);
  display:flex;align-items:center;justify-content:center;font-size:22px;margin-bottom:16px;
}
.card h4{margin:0 0 9px;font-size:18px;font-weight:700;color:var(--navy);letter-spacing:-.02em}
.card p{margin:0;color:var(--gray);font-size:14.5px;line-height:1.7}

/* ---------- 버튼 ---------- */
.btn{
  display:inline-flex;align-items:center;gap:8px;justify-content:center;
  padding:12px 24px;border-radius:8px;font-weight:700;font-size:15px;
  border:1px solid transparent;cursor:pointer;transition:.18s;line-height:1.4;
}
.btn-primary{background:var(--navy);color:#fff}
.btn-primary:hover{background:var(--navy-3)}
.btn-accent{background:var(--accent);color:#fff}
.btn-accent:hover{background:var(--accent-2)}
.btn-ghost{background:#fff;color:var(--navy);border-color:#c9d7ea}
.btn-ghost:hover{background:var(--bg-soft);border-color:var(--navy-3)}
.btn-outline-light{background:transparent;color:#fff;border-color:rgba(255,255,255,.45)}
.btn-outline-light:hover{background:rgba(255,255,255,.12)}
.btn-danger{background:#d94848;color:#fff}
.btn-danger:hover{background:#c23c3c}
.btn-sm{padding:7px 14px;font-size:13.5px;border-radius:6px}
.btn:disabled{opacity:.5;cursor:not-allowed}

/* ---------- 표 ---------- */
.table{width:100%;border-collapse:collapse;font-size:14.5px;background:#fff}
.table th,.table td{padding:13px 14px;border-bottom:1px solid var(--line);text-align:left;vertical-align:middle}
.table thead th{
  background:var(--bg-soft);color:var(--navy);font-weight:700;font-size:13.5px;
  border-top:2px solid var(--navy);white-space:nowrap;
}
.table tbody tr:hover{background:#fafcff}
.table .num{text-align:center;color:var(--gray-2);width:60px}
.table-wrap{overflow-x:auto;border-radius:var(--radius);border:1px solid var(--line)}

.badge{
  display:inline-block;padding:3px 10px;border-radius:20px;font-size:12px;font-weight:700;
  background:var(--bg-soft-2);color:var(--navy);
}
.badge.chief{background:#fdf3dc;color:#9a7420}
.badge.member{background:#e2f5ee;color:#04795c}
.badge.alumni{background:#eceff3;color:#6a7686}

/* ---------- 폼 ---------- */
.field{margin-bottom:16px}
.field label{display:block;font-weight:700;font-size:13.5px;color:var(--navy);margin-bottom:6px}
.field .hint{font-weight:400;color:var(--gray-2);font-size:12.5px;margin-left:6px}
input[type=text],input[type=date],input[type=password],input[type=number],input[type=email],select,textarea{
  width:100%;padding:11px 13px;border:1px solid #d5dde8;border-radius:7px;font-size:14.5px;
  font-family:inherit;color:var(--ink);background:#fff;transition:.15s;
}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px rgba(0,169,127,.13)}
textarea{resize:vertical;min-height:92px}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:16px}

.notice-box{
  background:#f0f7ff;border:1px solid #cfe2f8;border-left:4px solid var(--navy-3);
  padding:16px 18px;border-radius:8px;font-size:14px;color:#2c4b70;margin-bottom:22px;
}
.notice-box strong{color:var(--navy)}
.warn-box{
  background:#fff8ec;border:1px solid #f3e0bd;border-left:4px solid var(--gold);
  padding:16px 18px;border-radius:8px;font-size:14px;color:#7a5f24;
}

/* ---------- 푸터 ---------- */
.site-footer{background:var(--navy);color:#a9bdd6;padding:52px 0 30px;font-size:14px;margin-top:0}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr;gap:40px;padding-bottom:30px;border-bottom:1px solid rgba(255,255,255,.12)}
.site-footer h5{color:#fff;font-size:15px;margin:0 0 14px;font-weight:700}
.site-footer p{margin:0 0 6px;line-height:1.8;font-size:13.5px}
.site-footer ul{list-style:none;padding:0;margin:0}
.site-footer li{margin-bottom:7px;font-size:13.5px}
.site-footer a:hover{color:#fff}
.copyright{padding-top:22px;font-size:12.5px;color:#7f96b3;display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px}

/* ---------- 탭 ---------- */
.tabs{display:flex;gap:6px;border-bottom:2px solid var(--line);margin-bottom:30px;flex-wrap:wrap}
.tabs button{
  background:none;border:0;padding:13px 22px;font-size:15.5px;font-weight:700;color:var(--gray-2);
  cursor:pointer;border-bottom:3px solid transparent;margin-bottom:-2px;transition:.15s;
}
.tabs button:hover{color:var(--navy)}
.tabs button.on{color:var(--navy);border-bottom-color:var(--accent)}
.tab-panel{display:none}
.tab-panel.on{display:block}

/* ---------- 모달 ---------- */
.modal-back{
  position:fixed;inset:0;background:rgba(13,28,48,.55);z-index:500;
  display:none;align-items:center;justify-content:center;padding:24px;
}
.modal-back.on{display:flex}
.modal{
  background:#fff;border-radius:12px;width:100%;max-width:560px;max-height:90vh;
  overflow:auto;box-shadow:var(--shadow-lg);
}
.modal-head{padding:20px 26px;border-bottom:1px solid var(--line);display:flex;justify-content:space-between;align-items:center}
.modal-head h3{margin:0;font-size:19px;color:var(--navy);font-weight:800}
.modal-body{padding:24px 26px}
.modal-foot{padding:16px 26px;border-top:1px solid var(--line);display:flex;justify-content:flex-end;gap:10px;background:var(--bg-soft)}
.x-btn{background:none;border:0;font-size:24px;color:var(--gray-2);cursor:pointer;line-height:1}

/* ---------- 토스트 ---------- */
#toast{
  position:fixed;left:50%;bottom:34px;transform:translateX(-50%) translateY(20px);
  background:var(--navy);color:#fff;padding:13px 24px;border-radius:8px;font-size:14.5px;
  font-weight:600;z-index:900;opacity:0;pointer-events:none;transition:.25s;box-shadow:var(--shadow-lg);
}
#toast.on{opacity:1;transform:translateX(-50%) translateY(0)}
#toast.err{background:#c23c3c}

/* ---------- 반응형 ---------- */
@media (max-width:960px){
  .grid-3,.grid-4{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr;gap:26px}
  .nav-toggle{display:block}
  .gnb{
    position:absolute;top:78px;left:0;right:0;background:#fff;flex-direction:column;
    height:auto;border-top:1px solid var(--line);box-shadow:var(--shadow-lg);display:none;padding:8px 0;
  }
  .gnb.open{display:flex}
  .gnb > li{display:block}
  .gnb > li > a{height:auto;padding:13px 24px}
  .gnb > li > a::after{display:none}
  .submenu{position:static;transform:none;opacity:1;visibility:visible;box-shadow:none;border:0;
    padding:0 0 8px 24px;min-width:0;display:none}
  .gnb > li.open-sub .submenu{display:block}
  .page-hero h1{font-size:29px}
}
@media (max-width:640px){
  .grid-2,.grid-3,.grid-4{grid-template-columns:1fr}
  .form-row{grid-template-columns:1fr}
  .topbar{display:none}
  .section{padding:52px 0}
}

/* ============================================================
   증명서 (Certificate) — 첨부 PPT 양식 재현
   A4 세로 210 × 297mm / 좌표는 PPT 원본 인치값을 mm 환산
   ============================================================ */
.cert-stage{background:#dfe5ec;padding:26px;border-radius:var(--radius);overflow:auto}

.cert-paper{
  position:relative;
  width:210mm;height:297mm;
  background:#fff;margin:0 auto;
  box-shadow:0 6px 30px rgba(0,0,0,.18);
  overflow:hidden;
  color:#0b0b0b;
  font-family:"윤명조 130","윤명조","YoonMyungjo","Nanum Myeongjo","NanumMyeongjo",
              "Batang","바탕","Times New Roman",serif;
  box-sizing:border-box;
}
.cert-paper *{box-sizing:border-box}
.cert-paper > div{position:absolute}
.cert-paper img{display:block;width:100%;height:100%;object-fit:contain}

/* 문서번호 : PPT (1.00in, 0.80in) 12pt */
.c-docno{left:25.4mm;top:20.3mm;font-size:12pt;letter-spacing:.02em;white-space:nowrap}

/* 대학 심볼마크 : PPT (2.03in, 0.98in) 4.21 × 1.28in → 원형이므로 높이 기준 중앙 */
.c-logo{left:51.6mm;top:24.9mm;width:106.9mm;height:32.5mm}

/* 제목 "증 명 서" : PPT (1.28in, 2.34in) 5.70 × 0.82in, 43pt */
.c-title{left:32.5mm;top:59.4mm;width:144.8mm;
  font-size:43pt;text-align:center;letter-spacing:.28em;text-indent:.28em;line-height:1.15}

/* 성명 : PPT (1.63in, 3.84in) 5.00 × 0.68in, 35pt */
.c-name{left:41.4mm;top:97.5mm;width:127mm;
  font-size:35pt;text-align:center;letter-spacing:.12em;text-indent:.12em;line-height:1.2}

/* 금색 밑줄 : PPT (2.89in, 4.63in) 2.49 × 0.04in */
.c-underline{left:73.4mm;top:117.6mm;width:63.2mm;height:1.2mm}
.c-underline img{object-fit:fill}

/* 인적사항 라벨 : PPT (1.59in, 5.05in) 17.5pt */
.c-label{left:40.4mm;top:128.3mm;width:36mm;
  font-size:17.5pt;line-height:1.55;white-space:nowrap}

/* 인적사항 값 : PPT (2.93in, 5.05in) */
.c-value{left:74.4mm;top:128.3mm;width:110mm;
  font-size:17.5pt;line-height:1.55;white-space:nowrap}

/* 본문 : PPT (0.93in, 6.53in) 6.40 × 1.02in, 16pt */
.c-body{left:22mm;top:165.9mm;width:165.9mm;
  font-size:16pt;text-align:center;line-height:1.72;word-break:keep-all;
  overflow-wrap:break-word}

/* 발급일 : PPT (2.56in, 8.14in) 3.14in, 21pt */
.c-date{left:60mm;top:206.8mm;width:90mm;
  font-size:21pt;text-align:center;letter-spacing:.06em;white-space:nowrap}

/* 동아리 엠블럼 : PPT (6.17in, 7.91in) 1.45 × 1.34in */
.c-emblem{left:156.7mm;top:200.9mm;width:36.8mm;height:34mm}

/* 지도교수 : PPT (2.60in, 8.70in) 2.49in, 17.3pt */
.c-signer{left:60mm;top:221mm;width:75mm;
  font-size:17.3pt;text-align:center;letter-spacing:.04em;white-space:nowrap}

/* 서명 : PPT (4.73in, 8.59in) 1.21 × 0.54in */
.c-sign{left:120.1mm;top:218.2mm;width:30.7mm;height:13.7mm}

/* 발급기관 : PPT (0.45in, 9.81in) 7.37in, 28.4pt — 직인이 붙는 줄 */
.c-org{left:11.4mm;top:249.2mm;width:187.2mm;
  font-size:28.4pt;text-align:center;letter-spacing:.06em;line-height:1.3;white-space:nowrap}
.c-org-in{display:inline-block;position:relative}
.dept-anchor{position:relative;display:inline-block}

/* 영문 기관명 : PPT (1.16in, 10.35in) 10.5pt */
.c-org-en{left:20mm;top:263.4mm;width:170mm;
  font-size:10.5pt;text-align:center;letter-spacing:.04em;line-height:1.4;
  font-family:"Times New Roman",serif}

/* ---------- 직인 ---------- */
.seal{
  position:absolute !important;
  left:100%;top:50%;
  width:24mm;height:24mm;
  object-fit:contain;
  mix-blend-mode:multiply;
  pointer-events:none;
  z-index:5;
}
.seal-fallback{
  position:absolute;left:100%;top:50%;
  width:24mm;height:24mm;
  border:2px dashed #c0392b;border-radius:4px;color:#c0392b;
  display:flex;align-items:center;justify-content:center;text-align:center;
  font-size:9pt;font-weight:700;line-height:1.3;letter-spacing:0;z-index:5;
  font-family:"Malgun Gothic",sans-serif;
}

/* ---------- 인쇄 ---------- */
@page{size:A4 portrait;margin:0}
@media print{
  html,body{background:#fff !important;margin:0 !important;padding:0 !important}
  body *{visibility:hidden !important}
  #printArea,#printArea *{visibility:visible !important}
  #printArea{position:absolute !important;left:0 !important;top:0 !important;width:210mm !important}
  .cert-stage{padding:0 !important;background:none !important;border-radius:0 !important;overflow:visible !important}
  .cert-paper{
    box-shadow:none !important;margin:0 !important;
    width:210mm !important;height:297mm !important;
    page-break-after:always;break-after:page;
  }
  .cert-paper:last-child{page-break-after:auto;break-after:auto}
  .no-print{display:none !important}
  .seal{mix-blend-mode:normal}
}

/* 직인 조정 패널 */
.seal-ctrl{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;align-items:end}
.seal-ctrl .field{margin:0}
.range-val{font-weight:700;color:var(--accent);font-size:13px}

/* AI 튜터 채팅 */
.chat-box{border:1px solid var(--line);border-radius:var(--radius);background:#fff;display:flex;flex-direction:column;height:520px;overflow:hidden}
.chat-head{padding:14px 20px;border-bottom:1px solid var(--line);background:var(--bg-soft);display:flex;align-items:center;gap:10px;font-weight:700;color:var(--navy);font-size:15px}
.chat-log{flex:1;overflow-y:auto;padding:20px;display:flex;flex-direction:column;gap:14px;background:#fbfcfe}
.msg{max-width:78%;padding:12px 16px;border-radius:14px;font-size:14.5px;line-height:1.7;white-space:pre-wrap}
.msg.bot{background:#fff;border:1px solid var(--line);align-self:flex-start;border-bottom-left-radius:4px}
.msg.me{background:var(--navy);color:#fff;align-self:flex-end;border-bottom-right-radius:4px}
.msg .who{display:block;font-size:11.5px;font-weight:700;opacity:.6;margin-bottom:4px;letter-spacing:.04em}
.chat-input{display:flex;gap:10px;padding:14px;border-top:1px solid var(--line);background:#fff}
.chat-input input{flex:1}
.chip-row{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:16px}
.chip{
  padding:7px 14px;border:1px solid #d5dde8;border-radius:20px;background:#fff;
  font-size:13.5px;cursor:pointer;color:var(--gray);transition:.15s;
}
.chip:hover{border-color:var(--accent);color:var(--accent)}
.chip.on{background:var(--navy);border-color:var(--navy);color:#fff;font-weight:700}

.progress{height:9px;background:var(--bg-soft-2);border-radius:20px;overflow:hidden}
.progress > i{display:block;height:100%;background:linear-gradient(90deg,var(--navy-3),var(--accent));border-radius:20px}

/* 통계 타일 */
.stat{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px;text-align:center}
.stat b{display:block;font-size:32px;color:var(--navy);font-weight:800;letter-spacing:-.03em;line-height:1.2}
.stat span{font-size:13.5px;color:var(--gray-2)}

.empty{padding:56px 20px;text-align:center;color:var(--gray-2);font-size:14.5px}