:root{--bg:#f7f6f2;--card:#fff;--ink:#1d2433;--mut:#6b7280;--line:#e5e2da;--acc:#e8590c;--acc2:#1f3a5f;--A:#2f9e44;--R:#1c7ed6;--F:#e03131;--soft:#fff4e6}
*{box-sizing:border-box}
body{margin:0;font-family:'Pretendard','Apple SD Gothic Neo','Malgun Gothic',system-ui,sans-serif;background:var(--bg);color:var(--ink);line-height:1.7;-webkit-font-smoothing:antialiased}
a{color:var(--acc2)}
button{font:inherit;cursor:pointer}
header{background:var(--card);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20}
.hw{max-width:980px;margin:0 auto;padding:10px 16px;display:flex;align-items:center;gap:12px;flex-wrap:wrap}
.brand{font-weight:800;font-size:18px;color:var(--ink);text-decoration:none;letter-spacing:-.4px}
.brand b{color:var(--acc)}
.hw .sp{flex:1}
.who{font-size:13px;color:var(--mut)}
main{max-width:980px;margin:0 auto;padding:20px 16px 90px}
h1,h2,h3{letter-spacing:-.4px;line-height:1.35}
.hero{padding:34px 0 10px}
.hero h1{font-size:32px;margin:0 0 10px}
.hero p{color:var(--mut);font-size:17px;margin:0 0 6px}
.card{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:20px;margin:14px 0}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.btn{background:var(--acc);color:#fff;border:0;border-radius:10px;padding:10px 16px;font-weight:700}
.btn.sec{background:var(--acc2)}
.btn.ghost{background:#fff;color:var(--ink);border:1px solid var(--line)}
.btn.sm{padding:6px 11px;font-size:13px}
.btn:disabled{opacity:.45;cursor:default}
input,textarea,select{width:100%;font:inherit;padding:10px 12px;border:1px solid var(--line);border-radius:10px;background:#fff;color:var(--ink)}
textarea{min-height:80px;resize:vertical}
label{font-size:13px;color:var(--mut);display:block;margin:10px 0 4px}
.row{display:flex;gap:8px;flex-wrap:wrap;align-items:center}
.mut{color:var(--mut)}.sm{font-size:13px}
.chips{display:flex;gap:6px;flex-wrap:wrap}
.chip{border:1px solid var(--line);background:#fff;border-radius:999px;padding:5px 12px;font-size:13px;color:var(--ink)}
.chip.on{background:var(--acc2);border-color:var(--acc2);color:#fff}
.tabs{display:flex;gap:4px;border-bottom:2px solid var(--line);margin:14px 0 6px;overflow-x:auto}
.tabs button{background:none;border:0;padding:10px 14px;font-weight:700;color:var(--mut);border-bottom:3px solid transparent;margin-bottom:-2px;white-space:nowrap}
.tabs button.on{color:var(--acc);border-bottom-color:var(--acc)}
.sess{display:flex;gap:14px;align-items:flex-start}
.sess .num{font-size:13px;font-weight:800;color:#fff;background:var(--acc);border-radius:8px;padding:2px 9px;white-space:nowrap}
.concept{border-left:4px solid var(--acc);background:var(--soft);padding:10px 14px;border-radius:0 10px 10px 0;margin:8px 0}
.concept b{display:block}
.chap{border:1px solid var(--line);border-radius:12px;margin:10px 0;background:#fff}
.chap summary{padding:12px 14px;font-weight:700;cursor:pointer;list-style:none}
.chap summary::-webkit-details-marker{display:none}
.chap summary small{color:var(--mut);font-weight:500;margin-right:6px}
.chap .in{padding:0 16px 14px}
.note{border-left:3px solid #c9a227;background:#fffbea;padding:8px 12px;border-radius:0 8px 8px 0;font-size:14px;color:#5c4a12;margin:10px 0}
.q{border:1px solid var(--line);border-radius:10px;padding:10px 12px;margin:6px 0;background:#fff}
.tag{display:inline-block;font-size:11px;font-weight:800;border-radius:6px;padding:1px 7px;margin-right:6px;color:#fff;background:var(--acc2)}
.tag.t1{background:#7048e8}.tag.t2{background:var(--acc)}.tag.t3{background:var(--A)}
.post{border-bottom:1px solid var(--line);padding:12px 2px}
.post .meta{font-size:12px;color:var(--mut);display:flex;gap:8px;align-items:center}
.post .body{white-space:pre-wrap;margin:4px 0}
.like{border:1px solid var(--line);background:#fff;border-radius:999px;padding:2px 10px;font-size:12px}
.like.on{background:#fff0f0;border-color:var(--F);color:var(--F)}
.opt{display:block;width:100%;text-align:left;border:2px solid var(--line);background:#fff;border-radius:12px;padding:14px;margin:8px 0;font-size:17px;font-weight:700}
.opt.sel{border-color:var(--acc2);background:#eef3fb}
.opt.ok{border-color:var(--A);background:#ebfbee}
.bar{height:30px;border-radius:8px;background:#eef0f3;margin:6px 0;position:relative;overflow:hidden}
.bar i{position:absolute;left:0;top:0;bottom:0;background:var(--acc2);border-radius:8px;transition:width .4s}
.bar.ok i{background:var(--A)}
.bar span{position:relative;z-index:1;padding:0 10px;line-height:30px;font-weight:700;font-size:14px;color:var(--ink);display:flex;justify-content:space-between}
.bar.ok span,.bar span.w{color:#fff}
#toast{position:fixed;left:50%;bottom:22px;transform:translateX(-50%);z-index:99}
#toast div{background:var(--ink);color:#fff;padding:10px 16px;border-radius:10px;margin-top:6px;font-size:14px;box-shadow:0 8px 24px #0003}
.empty{color:var(--mut);text-align:center;padding:24px}
.code{font-family:ui-monospace,Consolas,monospace;font-weight:800;letter-spacing:3px;background:#fff;border:2px dashed var(--acc);border-radius:10px;padding:6px 14px;font-size:22px}
.diagram{background:#fff;border:1px solid var(--line);border-radius:14px;padding:10px;margin:10px 0;text-align:center}
.diagram svg{width:100%;max-width:100%;height:auto;display:block}
.kpi{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:8px;margin:10px 0}
.kpi div{background:#f3f4f6;border-radius:10px;padding:8px 12px}.kpi small{display:block;color:var(--mut);font-size:12px}.kpi b{font-size:19px}
canvas{width:100%;background:#fff;border:1px solid var(--line);border-radius:10px}
/* 진행자 슬라이드 */
body.show{background:#0f1729;color:#fff}
body.show header{display:none}
body.show main{max-width:none;padding:0}
.deck{min-height:100vh;display:flex;flex-direction:column}
.slide{flex:1;display:flex;flex-direction:column;justify-content:center;padding:5vh 7vw;max-width:1400px;margin:0 auto;width:100%}
.slide h1{font-size:clamp(30px,4.4vw,60px);margin:0 0 2vh}
.slide h2{font-size:clamp(24px,3vw,42px);margin:0 0 2vh;color:#ffd8a8}
.slide p,.slide li{font-size:clamp(18px,1.9vw,28px)}
.slide .kicker{color:#ffa94d;font-weight:800;font-size:clamp(14px,1.3vw,20px);letter-spacing:1px;margin-bottom:1vh}
.slide .note{background:#2a2410;color:#ffe8a3;border-color:#fab005;font-size:clamp(15px,1.4vw,21px)}
.slide .concept{background:#16233d;color:#fff}
.slide .opt{background:#16233d;border-color:#2c3e63;color:#fff}
.slide .bar{background:#1d2b48;height:46px}.slide .bar span{line-height:46px;font-size:clamp(16px,1.6vw,22px);color:#fff}
.slide .diagram{background:#fff;width:100%;max-width:760px;margin:2vh auto;align-self:center}
.slide .code{font-size:clamp(30px,4vw,56px);background:transparent;color:#ffd8a8}
.ctrl{display:flex;gap:8px;align-items:center;padding:10px 16px;background:#0b1120;border-top:1px solid #1e2a44;flex-wrap:wrap}
.ctrl .btn.ghost{background:#16233d;color:#fff;border-color:#2c3e63}
.ctrl .cnt{color:#94a3b8;font-size:13px;margin:0 8px}
.pq{background:#16233d;border-radius:12px;padding:12px 16px;margin:8px 0;font-size:clamp(16px,1.6vw,23px)}
.pq small{color:#94a3b8}
@media(max-width:700px){.grid2,.grid3{grid-template-columns:1fr}.hero h1{font-size:25px}.sess{flex-direction:column;gap:4px}}