/* 학생회 소통 플랫폼 — 심플한 라이트/다크 UI */
:root{
  --blue:#3182f6;--blue-d:#1b64da;--blue-l:#e8f3ff;
  --bg:#f2f4f6;--card:#fff;--ink:#191f28;--ink2:#4e5968;--mute:#6b7684;--line:#e5e8eb;--soft:#f2f4f6;
  --red:#e5484d;--red-l:#fdecec;--green:#12a150;--green-l:#e6f7ee;--amber:#b25e09;--amber-l:#fff3e0;
  --shadow:0 1px 2px rgba(15,23,42,.04),0 6px 20px rgba(15,23,42,.06);
  --r:16px;color-scheme:light;
}
@media (prefers-color-scheme:dark){:root:not([data-theme=light]){
  --blue:#4593fc;--blue-d:#3182f6;--blue-l:rgba(69,147,252,.16);
  --bg:#17171c;--card:#202027;--ink:#f2f4f6;--ink2:#c9ced6;--mute:#9ea6b0;--line:#33343c;--soft:#2a2b33;
  --red:#ff6b6f;--red-l:rgba(255,107,111,.14);--green:#3ddc84;--green-l:rgba(61,220,132,.13);--amber:#ffb257;--amber-l:rgba(255,178,87,.14);
  --shadow:0 1px 2px rgba(0,0,0,.4),0 8px 24px rgba(0,0,0,.3);color-scheme:dark}}
:root[data-theme=dark]{
  --blue:#4593fc;--blue-d:#3182f6;--blue-l:rgba(69,147,252,.16);
  --bg:#17171c;--card:#202027;--ink:#f2f4f6;--ink2:#c9ced6;--mute:#9ea6b0;--line:#33343c;--soft:#2a2b33;
  --red:#ff6b6f;--red-l:rgba(255,107,111,.14);--green:#3ddc84;--green-l:rgba(61,220,132,.13);--amber:#ffb257;--amber-l:rgba(255,178,87,.14);
  --shadow:0 1px 2px rgba(0,0,0,.4),0 8px 24px rgba(0,0,0,.3);color-scheme:dark}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font-family:Pretendard Variable,Pretendard,-apple-system,BlinkMacSystemFont,system-ui,'Noto Sans KR',sans-serif;line-height:1.6;font-size:16px;-webkit-font-smoothing:antialiased}
button,input,select,textarea{font:inherit;color:inherit}
:focus-visible{outline:3px solid var(--blue);outline-offset:2px}
a{color:var(--blue)}
h1,h2,h3{margin:0;letter-spacing:-.02em}
h2{font-size:26px;line-height:1.3}
h3{font-size:18px}
.boot{padding:80px 20px;text-align:center;color:var(--mute)}
[hidden]{display:none!important}

/* 레이아웃 */
.topbar{position:sticky;top:0;z-index:30;background:color-mix(in srgb,var(--card) 88%,transparent);backdrop-filter:saturate(1.4) blur(12px);-webkit-backdrop-filter:saturate(1.4) blur(12px);border-bottom:1px solid var(--line);display:flex;align-items:center;gap:10px;padding:10px 20px;padding-top:max(10px,env(safe-area-inset-top))}
.brand{font-weight:800;font-size:18px;letter-spacing:-.03em;display:flex;align-items:center;gap:8px;color:var(--ink);text-decoration:none}
.brand img{width:28px;height:28px;border-radius:8px}
.topbar .sp{flex:1}
.who{font-size:14px;color:var(--mute);max-width:42vw;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.icon-btn{border:0;background:var(--soft);width:36px;height:36px;border-radius:50%;cursor:pointer;font-size:16px;line-height:1}
.shell{display:grid;grid-template-columns:200px minmax(0,1fr);max-width:1080px;margin:0 auto;gap:8px}
.side{position:sticky;top:57px;align-self:start;padding:18px 10px;display:flex;flex-direction:column;gap:4px}
.side a{display:flex;align-items:center;gap:10px;padding:11px 14px;border-radius:12px;color:var(--ink2);text-decoration:none;font-weight:600}
.side a:hover{background:var(--soft)}
.side a[aria-current=page]{background:var(--blue-l);color:var(--blue)}
.side .ico{width:22px;text-align:center}
.badge{margin-left:auto;background:var(--red);color:#fff;border-radius:99px;font-size:12px;font-weight:700;padding:0 7px;min-width:20px;text-align:center;line-height:20px}
main{padding:24px 20px 90px;min-width:0}
.page-head{margin-bottom:18px}
.sub{color:var(--mute);margin:4px 0 0}

@media (max-width:760px){
  .shell{display:block}
  .side{position:fixed;left:0;right:0;bottom:0;top:auto;z-index:30;flex-direction:row;justify-content:space-around;gap:0;padding:6px 6px calc(6px + env(safe-area-inset-bottom));background:var(--card);border-top:1px solid var(--line)}
  .side a{flex-direction:column;gap:2px;padding:6px 4px;font-size:11px;flex:1;text-align:center;position:relative;border-radius:10px}
  .side .badge{position:absolute;top:0;right:calc(50% - 22px);margin:0;line-height:16px;min-width:16px;font-size:10px;padding:0 4px}
  .side .ico{font-size:19px;line-height:1.2}
  main{padding:18px 14px 100px}
  h2{font-size:22px}
}

/* 카드 · 버튼 · 폼 */
.card{background:var(--card);border-radius:var(--r);padding:18px 20px;margin-bottom:12px;box-shadow:var(--shadow)}
.card.click{cursor:pointer;transition:transform .15s}
.card.click:hover{transform:translateY(-1px)}
.card h3{margin:6px 0 4px}
.meta{color:var(--mute);font-size:14px}
.row{display:flex;gap:8px;flex-wrap:wrap;align-items:center}
.row.sb{justify-content:space-between}
.grow{flex:1}
.btn{background:var(--blue);color:#fff;border:0;border-radius:12px;padding:10px 18px;font-weight:700;cursor:pointer;transition:filter .15s}
.btn:hover{filter:brightness(1.06)}
.btn:disabled{opacity:.5;cursor:default}
.btn.ghost{background:var(--soft);color:var(--ink2)}
.btn.danger{background:var(--red)}
.btn.sm{padding:6px 12px;font-size:14px;border-radius:10px}
.btn.block{width:100%;padding:14px}
.btn.google{background:#fff;color:#1f1f1f;border:1px solid #dadce0}
.btn.kakao{background:#fee500;color:#191919}
.btn.social{display:flex;align-items:center;justify-content:center;gap:10px;font-size:16px;padding:14px;width:100%}
.linkbtn{background:none;border:0;color:var(--mute);cursor:pointer;padding:4px;text-decoration:underline;font-size:14px}
input,select,textarea{width:100%;background:var(--card);border:1.5px solid var(--line);border-radius:12px;padding:11px 14px;font-size:16px}
input:focus,select:focus,textarea:focus{border-color:var(--blue);outline:none}
textarea{min-height:110px;resize:vertical}
input[type=checkbox]{width:auto;accent-color:var(--blue)}
.field{display:grid;gap:6px;margin-bottom:12px}
.field>span{font-size:14px;font-weight:600;color:var(--ink2)}
.field small{color:var(--mute)}
form.f{display:grid;gap:10px}
.err{color:var(--red);font-size:14px;margin:0;min-height:20px}
.chip{border:1.5px solid var(--line);background:var(--card);border-radius:99px;padding:6px 14px;cursor:pointer;font-size:14px;font-weight:600;color:var(--ink2)}
.chip[aria-pressed=true]{background:var(--ink);color:var(--card);border-color:var(--ink)}
.tag{display:inline-block;border-radius:99px;padding:2px 11px;font-size:13px;font-weight:700;background:var(--blue-l);color:var(--blue)}
.tag.red{background:var(--red-l);color:var(--red)}.tag.green{background:var(--green-l);color:var(--green)}.tag.amber{background:var(--amber-l);color:var(--amber)}.tag.gray{background:var(--soft);color:var(--mute)}
.empty{text-align:center;color:var(--mute);padding:36px 16px;background:var(--card);border-radius:var(--r)}
.notice{background:var(--blue-l);color:var(--ink2);border-radius:14px;padding:14px 16px;font-size:15px;margin-bottom:14px}
.notice.warn{background:var(--amber-l)}
.notice b{color:var(--ink)}
pre.txt{white-space:pre-wrap;word-break:break-word;font:inherit;margin:10px 0}
.thumbrow{display:flex;gap:12px;align-items:flex-start}
.thumbrow img{width:72px;height:72px;object-fit:cover;border-radius:12px;flex:none;background:var(--soft)}
.gallery{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:8px;margin:12px 0}
.gallery img{width:100%;aspect-ratio:1;object-fit:cover;border-radius:12px;cursor:zoom-in;background:var(--soft)}
.previews{display:flex;gap:8px;flex-wrap:wrap}
.previews .pv{position:relative}
.previews img{width:72px;height:72px;object-fit:cover;border-radius:10px}
.previews button{position:absolute;top:-6px;right:-6px;width:22px;height:22px;border-radius:50%;border:0;background:var(--ink);color:var(--card);cursor:pointer;font-size:12px;line-height:1}
.kv{display:grid;grid-template-columns:110px 1fr;gap:6px 12px;font-size:15px}
.kv dt{color:var(--mute)}.kv dd{margin:0;word-break:break-word}
.tabs{display:flex;gap:6px;margin-bottom:14px;overflow-x:auto}
.code{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:26px;font-weight:800;letter-spacing:.08em;background:var(--soft);padding:12px 16px;border-radius:12px;text-align:center;margin:10px 0;user-select:all}

/* 로그인 화면 */
.landing{max-width:460px;margin:0 auto;padding:max(48px,8vh) 20px 40px}
.landing h1{font-size:30px;line-height:1.3;margin:18px 0 10px}
.landing .lead{color:var(--ink2);margin-bottom:26px}
.landing ul{list-style:none;padding:0;margin:26px 0;display:grid;gap:12px}
.landing li{display:flex;gap:12px;align-items:flex-start;color:var(--ink2);font-size:15px}
.landing li b{color:var(--ink)}
.landing li span.i{font-size:22px;line-height:1.3}
.gap{display:grid;gap:10px}
.fine{color:var(--mute);font-size:13px;margin-top:20px}

/* 다이얼로그 */
dialog{border:0;border-radius:20px;padding:22px;width:min(420px,92vw);background:var(--card);color:var(--ink);box-shadow:0 20px 60px rgba(0,0,0,.3)}
dialog.wide{width:min(860px,96vw)}
dialog::backdrop{background:rgba(15,23,42,.55)}
.dlg-msg{color:var(--ink2);white-space:pre-line;margin:8px 0 16px}
.dlg-btns{display:flex;gap:8px;justify-content:flex-end;margin-top:14px}
.lb{margin:0;text-align:center}
.lb img{max-width:100%;max-height:78vh;border-radius:12px}
.lb-close{margin-top:12px}

/* 토스트 */
#toasts{position:fixed;left:0;right:0;bottom:90px;display:grid;gap:8px;justify-items:center;z-index:99;pointer-events:none;padding:0 16px}
.toast{background:var(--ink);color:var(--card);padding:11px 18px;border-radius:99px;font-size:15px;font-weight:600;box-shadow:var(--shadow);max-width:92vw}
.toast.err{background:var(--red);color:#fff}.toast.ok{background:var(--green);color:#fff}

/* DM */
.dm{display:grid;grid-template-columns:270px minmax(0,1fr);gap:12px;align-items:start}
.dm .list .card{margin-bottom:8px;padding:14px 16px}
.dm .list .card[aria-current=true]{outline:2px solid var(--blue)}
.dm.open .list.hide-m{display:block}
@media (max-width:760px){.dm{display:block}.dm.open .list{display:none}}
.chat{background:var(--card);border-radius:var(--r);box-shadow:var(--shadow);display:flex;flex-direction:column;height:calc(100vh - 150px);min-height:420px}
@media (max-width:760px){.chat{height:calc(100dvh - 190px)}}
.chat-head{padding:12px 16px;border-bottom:1px solid var(--line);display:flex;align-items:center;gap:10px}
.chat-head .back{display:none}
@media (max-width:760px){.chat-head .back{display:inline-block}}
.msgs{flex:1;overflow-y:auto;padding:14px 14px 6px;display:flex;flex-direction:column;gap:6px}
.day{align-self:center;font-size:12px;color:var(--mute);background:var(--soft);border-radius:99px;padding:2px 12px;margin:8px 0}
.bub{max-width:78%;display:flex;flex-direction:column;gap:2px}
.bub.mine{align-self:flex-end;align-items:flex-end}
.bub .b{background:var(--soft);padding:9px 13px;border-radius:16px 16px 16px 4px;white-space:pre-wrap;word-break:break-word}
.bub.mine .b{background:var(--blue);color:#fff;border-radius:16px 16px 4px 16px}
.bub .b.lock{font-style:italic;color:var(--mute);background:var(--soft)}
.bub .b img{max-width:100%;max-height:260px;border-radius:10px;display:block;cursor:zoom-in}
.bub .t{font-size:11px;color:var(--mute);display:flex;gap:8px}
.bub .t button{background:none;border:0;color:var(--mute);cursor:pointer;font-size:11px;padding:0;text-decoration:underline}
.composer{border-top:1px solid var(--line);padding:10px;display:flex;gap:8px;align-items:flex-end}
.composer textarea{min-height:44px;max-height:120px;resize:none;padding:10px 14px;border-radius:22px}
.composer .btn{border-radius:22px;height:44px;white-space:nowrap;flex:none}
.fp{font-size:12px;color:var(--mute);font-family:ui-monospace,Menlo,monospace}