/* KTX v2 공통 화면 스타일  코레일 블루, 맑은 고딕 */
:root{
  --blue:#005BAC;--blue-d:#004585;--light:#00B2E3;--gray:#6B6F76;--tint:#EEF4FB;--line:#D8E4F0;
  --ink:#1F2328;--bg:#F5F7FA;--ok:#0E8A6D;--warn:#B26A00;--bad:#C0392B;--yellow:#FFF6D6;--card:#fff;
  --fs:15px;
}
html.big{--fs:18px}
html.bigger{--fs:21px}
*{box-sizing:border-box}
html{font-size:var(--fs)}
body{margin:0;font-family:'Malgun Gothic','맑은 고딕','Apple SD Gothic Neo',sans-serif;background:var(--bg);color:var(--ink);line-height:1.55;-webkit-text-size-adjust:100%}
a{color:var(--blue)}
button,input,select,textarea{font:inherit;color:inherit}
.hidden{display:none!important}
.muted{color:var(--gray)}
.small{font-size:.86rem}
.tiny{font-size:.78rem}
.right{text-align:right}
.center{text-align:center}
.row{display:flex;gap:8px;align-items:center;flex-wrap:wrap}
.row.between{justify-content:space-between}
.grow{flex:1;min-width:0}
.stack>*+*{margin-top:10px}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
@media (max-width:640px){.grid2,.grid3{grid-template-columns:1fr}}

/* 글 표시  줄바꿈 유지와 주소 자동 연결 */
.txt{white-space:pre-wrap;word-break:break-word;overflow-wrap:anywhere}

/* 상단 */
.head{position:sticky;top:0;z-index:20;box-shadow:0 1px 4px rgba(0,0,0,.05)}
.top{background:#fff;border-bottom:2px solid var(--blue);padding:8px 14px;display:flex;align-items:center;gap:10px;min-height:50px}
.logo{font-weight:800;color:var(--blue);font-size:1.3rem;letter-spacing:1px;text-decoration:none;white-space:nowrap}
.logo small{color:var(--gray);font-weight:400;font-size:.72rem;letter-spacing:0;margin-left:6px}
.top .title{flex:1;min-width:0;font-weight:700;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.top .me{font-size:.86rem;color:var(--gray);white-space:nowrap}

/* 탭 */
.tabs{display:flex;background:#fff;border-bottom:1px solid var(--line);overflow-x:auto}
.tabs button{flex:1;min-width:72px;border:0;background:none;padding:11px 8px;color:var(--gray);cursor:pointer;border-bottom:3px solid transparent;white-space:nowrap;position:relative}
.tabs button.on{color:var(--blue);font-weight:700;border-bottom-color:var(--blue)}
.tabs button .dot{position:absolute;top:7px;right:calc(50% - 26px);width:8px;height:8px;border-radius:50%;background:#E8462B}
.subtabs{display:flex;gap:6px;flex-wrap:wrap;margin-bottom:10px}
.subtabs button{border:1px solid var(--line);background:#fff;border-radius:16px;padding:5px 13px;cursor:pointer;color:var(--gray)}
.subtabs button.on{background:var(--blue);border-color:var(--blue);color:#fff}

main,.main{max-width:980px;margin:0 auto;padding:14px}
.wide{max-width:1240px}

/* 카드와 입력 */
.card{background:var(--card);border:1px solid var(--line);border-radius:10px;padding:14px 16px;margin-bottom:12px}
.card h2{margin:0 0 10px;font-size:1.1rem;color:var(--blue)}
.card h3{margin:0 0 8px;font-size:1rem;color:var(--blue)}
label.f{font-size:.84rem;color:var(--gray);display:block;margin:10px 0 4px}
input[type=text],input[type=password],input[type=number],input[type=date],input[type=url],input[type=search],input:not([type]),select,textarea{
  width:100%;border:1px solid #C9D6E4;border-radius:8px;padding:9px 10px;background:#fff;font-size:1rem}
input:focus,select:focus,textarea:focus{outline:2px solid var(--light);outline-offset:0;border-color:var(--light)}
textarea{min-height:90px;resize:vertical;line-height:1.5}
textarea.short{min-height:60px}
textarea.tall{min-height:160px}
.check{display:flex;gap:8px;align-items:flex-start;font-size:.9rem;margin-top:8px;cursor:pointer}
.check input{width:auto;margin-top:4px}
.hint{font-size:.82rem;color:var(--gray);margin-top:6px}

.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;border:1px solid #C9D6E4;background:#fff;border-radius:8px;padding:8px 14px;cursor:pointer;white-space:nowrap;text-decoration:none;color:var(--ink);font-size:.95rem}
.btn:hover{border-color:var(--blue)}
.btn.pri{background:var(--blue);border-color:var(--blue);color:#fff}
.btn.pri:hover{background:var(--blue-d)}
.btn.bad{color:var(--bad);border-color:#E6B8B2}
.btn.ghost{border-color:transparent;background:transparent;color:var(--gray);padding:6px 8px}
.btn.sm{padding:4px 10px;font-size:.84rem;border-radius:6px}
.btn.lg{padding:12px 20px;font-size:1.05rem}
.btn.full{width:100%}
.btn:disabled{opacity:.55;cursor:default}
.chip{display:inline-block;border-radius:12px;padding:1px 9px;font-size:.78rem;background:var(--tint);color:var(--blue);white-space:nowrap}
.chip.live{background:#E3F6EF;color:var(--ok)}
.chip.ready{background:#FFF3DC;color:var(--warn)}
.chip.closed{background:#ECEDEF;color:var(--gray)}
.chip.bad{background:#FBE9E7;color:var(--bad)}

/* 알림 줄, 타이머 */
.notice{background:var(--yellow);border-bottom:1px solid #F0DE9C;padding:9px 14px;font-size:.95rem}
.notice .txt{max-width:980px;margin:0 auto}
.timer{background:var(--blue);color:#fff;padding:7px 14px;text-align:center;font-weight:700;font-size:1.05rem;letter-spacing:.5px}
.timer.over{background:var(--bad)}

/* 게시물 */
.post{border:1px solid var(--line);border-radius:9px;padding:10px 12px;margin-bottom:9px;background:#fff}
.post.teacher{background:var(--tint);border-color:#9DC0E4}
.post.pinned{box-shadow:inset 3px 0 0 var(--blue)}
.post .meta{font-size:.8rem;color:var(--gray);display:flex;gap:8px;align-items:center;flex-wrap:wrap;margin-bottom:4px}
.post .meta .who{font-weight:700;color:var(--ink)}
.post .acts{display:flex;gap:6px;align-items:center;flex-wrap:wrap;margin-top:6px}
.reply{margin-top:8px;padding:8px 10px;background:#F3F8FD;border-left:3px solid var(--blue);border-radius:4px}
.post.teacher .reply{background:#fff}
.like{border:1px solid var(--line);background:#fff;border-radius:14px;font-size:.82rem;padding:2px 11px;cursor:pointer;color:var(--gray)}
.like.on{background:#FFEDEA;border-color:#F3B7AC;color:#D0391F}

/* 목록, 표 */
.list{list-style:none;margin:0;padding:0}
.list>li{border-bottom:1px solid var(--line);padding:9px 2px}
.list>li:last-child{border-bottom:0}
table.t{width:100%;border-collapse:collapse;font-size:.9rem;background:#fff}
table.t th,table.t td{border:1px solid var(--line);padding:6px 8px;text-align:left;vertical-align:top}
table.t th{background:var(--tint);color:var(--blue-d);font-weight:700;white-space:nowrap}
table.t td.n{text-align:right;white-space:nowrap}
.tscroll{overflow-x:auto}
.empty{color:var(--gray);text-align:center;padding:22px 8px;font-size:.92rem}
.bar{height:8px;background:#E7EEF6;border-radius:4px;overflow:hidden}
.bar>i{display:block;height:100%;background:var(--light)}
.stat{background:var(--tint);border-radius:9px;padding:10px 12px}
.stat b{display:block;font-size:1.45rem;color:var(--blue);line-height:1.2}
.stat span{font-size:.8rem;color:var(--gray)}

/* 슬라이드 */
.slidewrap{position:relative;width:100%;aspect-ratio:16/9;background:#111;border-radius:10px;overflow:hidden}
.slidewrap iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.pdfbox{background:#2B2F35;border-radius:10px;padding:8px;text-align:center}
.pdfbox canvas{max-width:100%;height:auto;background:#fff;border-radius:4px}
.pdfnav{display:flex;gap:8px;justify-content:center;align-items:center;margin-top:8px;color:#fff}

/* 퀴즈 */
.quiz-q{margin-bottom:16px}
.quiz-q .qt{font-weight:700;margin-bottom:6px}
.opt{display:flex;gap:9px;align-items:flex-start;padding:8px 10px;border:1px solid var(--line);border-radius:8px;margin:5px 0;cursor:pointer;background:#fff}
.opt input{width:auto;margin-top:5px}
.opt.right{border-color:#8BD3BC;background:#EEFAF5}
.opt.wrong{border-color:#F0B4AA;background:#FDF0EE}
.scale{display:flex;gap:6px}
.scale label{flex:1;text-align:center;border:1px solid var(--line);border-radius:8px;padding:8px 0;cursor:pointer;background:#fff}
.scale input{display:none}
.scale label.on{background:var(--blue);color:#fff;border-color:var(--blue)}

/* 팝업, 알림 */
.toast{position:fixed;bottom:22px;left:50%;transform:translateX(-50%);background:#23272E;color:#fff;border-radius:8px;padding:10px 18px;font-size:.92rem;z-index:200;max-width:90vw;box-shadow:0 4px 18px rgba(0,0,0,.25)}
.toast.err{background:var(--bad)}
.modal-bg{position:fixed;inset:0;background:rgba(15,25,40,.45);z-index:100;display:flex;align-items:flex-start;justify-content:center;padding:6vh 12px;overflow-y:auto}
.modal{background:#fff;border-radius:12px;max-width:640px;width:100%;padding:18px 20px;box-shadow:0 10px 40px rgba(0,0,0,.25)}
.modal.wide{max-width:960px}
.modal h2{margin:0 0 12px;font-size:1.15rem;color:var(--blue)}
.modal .acts{display:flex;gap:8px;justify-content:flex-end;margin-top:16px;flex-wrap:wrap}

/* 첫 화면(입장, 로그인) */
.gate{max-width:440px;margin:7vh auto 0;padding:0 14px}
.gate .big-logo{font-size:2.6rem;font-weight:800;color:var(--blue);letter-spacing:2px;text-align:center}
.gate .sub{color:var(--gray);text-align:center;margin:2px 0 22px;font-size:.88rem}
.codebox{font-size:1.6rem;letter-spacing:6px;text-align:center;font-weight:700}

.footer{color:#9AA3AD;font-size:.75rem;text-align:center;padding:20px 10px 30px}
.qr svg{width:100%;height:auto;display:block}
.sep{border:0;border-top:1px solid var(--line);margin:14px 0}
.badge-n{display:inline-block;min-width:20px;padding:0 6px;border-radius:10px;background:#E8462B;color:#fff;font-size:.75rem;text-align:center;line-height:18px}
@media print{.top,.tabs,.btn{display:none!important}}