/* ============================================================
   실습 코스 공용 엔진 — 스타일 (과학쌤과연수)
   토큰은 대문 index.html 과 같은 값(네이비 · 틸 · 슬레이트). 밝게 = :root, 어둡게 = [data-theme="dark"]
   서비스 모의 화면 CSS 는 여기 두지 않는다 — 강좌 폴더에서 따로 둔다
   ============================================================ */

/* ---------- 토큰 ---------- */
:root{
  --bg:#FFFFFF; --bg-alt:#F4F6F9; --surface:#FFFFFF; --surface-2:#F8FAFC;
  --ink:#0F1B2D; --ink-2:#3C4A5E; --ink-3:#6B7889; --line:#DDE3EA; --line-2:#EDF1F5;
  --navy:#132F4C; --navy-2:#1E4A73; --navy-soft:#E8EFF6;
  --accent:#0E7490; --accent-soft:#E0F2F7;
  --ok:#2E7D5B; --ok-soft:#E4F3EC; --warn:#B26A00; --warn-soft:#FBF1DF; --danger:#B04A4A; --danger-soft:#F8E9E9;
  --shadow:0 1px 2px rgba(15,27,45,.06),0 8px 24px -12px rgba(15,27,45,.18);
  --r-sm:8px; --r-md:12px; --r-lg:16px;
  --brand-ink:var(--navy);      /* 글자·아이콘용 네이비 */
  --on-navy:#FFFFFF;            /* 네이비 채움 위 글자 */
  --mark:#0E7490;               /* 화면 위 번호 표시 · 커서 클릭 (원본 주황 대체) */
  --mark-glow:rgba(14,116,144,.5);
  --mark-fill:rgba(14,116,144,.12);
  --font:'Pretendard Variable', Pretendard, 'Noto Sans KR', sans-serif;
  --mono:'Roboto Mono', ui-monospace, Menlo, Consolas, monospace;
  /* 수료증은 종이 문서라 테마와 관계없이 밝게 */
  --cert-paper:#FFFFFF; --cert-ink:#0F1B2D; --cert-ink-2:#3C4A5E; --cert-ink-3:#6B7889;
  --cert-line:#C9D5E2; --cert-frame:#132F4C; --cert-accent:#0E7490; --cert-tint:rgba(19,47,76,.05);
  --cert-seal:#B04A4A;
  color-scheme:light;
}
:root[data-theme="dark"]{
  --bg:#0B1420; --bg-alt:#0F1B2B; --surface:#121F31; --surface-2:#172740;
  --ink:#E8EEF5; --ink-2:#B7C3D2; --ink-3:#7F8EA3; --line:#243549; --line-2:#1B2A3D;
  --navy:#1E4A73; --navy-2:#2B6499; --navy-soft:#16304B;
  --accent:#4FB3C9; --accent-soft:#12303A;
  --ok:#5DBB8A; --ok-soft:#153426; --warn:#E0A23A; --warn-soft:#3A2E14; --danger:#E08A8A; --danger-soft:#3A1E1E;
  --shadow:0 1px 2px rgba(0,0,0,.4),0 8px 24px -12px rgba(0,0,0,.6);
  --brand-ink:#9CC3E6;
  --on-navy:#FFFFFF;
  --mark:#22A3BF; --mark-glow:rgba(34,163,191,.55); --mark-fill:rgba(34,163,191,.14);
  color-scheme:dark;
}

/* ---------- 바탕 ---------- */
*,*::before,*::after{box-sizing:border-box}
[hidden]{display:none !important}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg-alt);color:var(--ink);font-family:var(--font);font-size:16px;line-height:1.7;-webkit-font-smoothing:antialiased;overflow-x:hidden}
button,input,select,textarea{font:inherit;color:inherit}
a{color:var(--accent)}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.ce-ico{width:16px;height:16px;flex:none;display:inline-block;vertical-align:-3px}
.muted{color:var(--ink-3)}
.small{font-size:13px}
kbd{display:inline-block;font-family:var(--mono);font-size:.82em;padding:1px 6px;border:1px solid var(--line);border-bottom-width:2px;border-radius:5px;background:var(--surface);color:var(--ink);white-space:nowrap;line-height:1.5}

.ce-app{max-width:1320px;margin:0 auto;padding:24px 24px 64px}
.panel{background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);box-shadow:var(--shadow)}
.eyebrow{font-size:12px;font-weight:700;letter-spacing:.14em;color:var(--accent);text-transform:uppercase}

/* ---------- 버튼 ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:44px;padding:0 16px;border-radius:var(--r-md);border:1px solid var(--line);background:var(--surface);color:var(--ink);font-size:14.5px;font-weight:600;cursor:pointer;text-decoration:none;transition:background .15s,border-color .15s,color .15s,filter .15s}
.btn:hover{border-color:var(--accent);color:var(--ink)}
.btn.primary{background:var(--navy);border-color:var(--navy);color:var(--on-navy)}
.btn.primary:hover{filter:brightness(1.15);color:var(--on-navy)}
.btn.ghost{background:transparent}
.btn.sm{min-height:36px;padding:0 12px;font-size:13.5px}
.btn.xl{min-height:52px;padding:0 26px;font-size:16px}
.btn:disabled{opacity:.5;cursor:not-allowed;filter:none}
.btn.danger-soft{color:var(--danger)}
.btn.danger-soft:hover{border-color:var(--danger)}
.icon-btn{display:inline-grid;place-items:center;width:44px;height:44px;border-radius:var(--r-md);border:1px solid var(--line);background:var(--surface);color:var(--ink-2);cursor:pointer;transition:border-color .15s,color .15s}
.icon-btn:hover{border-color:var(--accent);color:var(--accent)}
.icon-btn .ce-ico{width:19px;height:19px}

/* ---------- 상단 바 ---------- */
.ce-top{display:flex;justify-content:space-between;align-items:flex-end;gap:16px;flex-wrap:wrap;margin-bottom:18px}
.ce-back{display:inline-flex;align-items:center;gap:6px;margin-bottom:10px;font-size:13.5px;font-weight:600;color:var(--ink-2);text-decoration:none;transition:color .15s}
.ce-back:hover{color:var(--accent)}
.ce-top h1{margin:4px 0 0;font-size:28px;font-weight:700;letter-spacing:-.02em;line-height:1.3;color:var(--ink);display:flex;align-items:center;gap:12px;word-break:keep-all}
.h1-ico{display:inline-grid;place-items:center;width:40px;height:40px;border-radius:10px;background:var(--navy);color:var(--on-navy);flex:none}
.h1-ico .ce-ico{width:22px;height:22px}
.ce-top-r{display:flex;gap:8px;align-items:center;flex-wrap:wrap}

/* 세그먼트 (운영체제 · 실제/모형) */
.seg{display:inline-flex;align-items:center;gap:2px;padding:3px;border:1px solid var(--line);border-radius:999px;background:var(--surface)}
.seg button{border:none;background:transparent;font-size:13px;line-height:1;padding:9px 13px;border-radius:999px;cursor:pointer;color:var(--ink-2);white-space:nowrap;display:inline-flex;align-items:center;gap:6px;transition:background .15s,color .15s}
.seg button:hover{color:var(--ink)}
.seg button.on{background:var(--navy);color:var(--on-navy);font-weight:700}
.seg button .ce-ico{width:14px;height:14px}

/* ---------- 시작 카드 ---------- */
.ce-intro{padding:32px 34px;display:grid;grid-template-columns:1.25fr 1fr;gap:32px;align-items:start}
.ce-intro h2{font-size:24px;letter-spacing:-.02em;margin:6px 0 10px;line-height:1.35;word-break:keep-all}
.ce-intro .lead{font-size:16px;color:var(--ink-2);margin:0 0 14px;word-break:keep-all}
.ce-intro ul.bul{list-style:none;margin:0 0 18px;padding:0}
.ce-intro ul.bul li{display:flex;gap:10px;align-items:flex-start;margin:6px 0;font-size:15px;word-break:keep-all}
.ce-intro ul.bul li .ce-ico{color:var(--accent);margin-top:4px}
.ce-meta{display:flex;gap:8px;flex-wrap:wrap;margin:0 0 20px}
.ce-meta span{display:inline-flex;align-items:center;gap:6px;padding:5px 11px;border-radius:999px;background:var(--bg-alt);border:1px solid var(--line);font-size:13px;color:var(--ink-2)}
.ce-outline{border:1px solid var(--line);border-radius:var(--r-md);padding:16px 18px;background:var(--surface-2)}
.ce-outline .st{display:flex;align-items:center;gap:8px;font-weight:700;font-size:14px;margin:10px 0 4px}
.ce-outline .st:first-child{margin-top:0}
.ce-outline ol{margin:0;padding-left:34px;font-size:14px;color:var(--ink-2)}
.ce-outline li{margin:2px 0}

/* ---------- 코스 상단 (진행도 · 버튼) ---------- */
.course-bar{display:flex;align-items:center;gap:18px;flex-wrap:wrap;padding:14px 18px;margin-bottom:16px}
.progress-wrap{flex:1;min-width:200px}
.progress-label{font-size:13px;color:var(--ink-2);margin-bottom:6px;display:flex;justify-content:space-between;gap:8px}
.progress-label b{color:var(--ink)}
.progress{height:8px;background:var(--line-2);border-radius:999px;overflow:hidden}
.progress-fill{height:100%;width:0;background:var(--accent);border-radius:999px;transition:width .4s}
.course-actions{display:flex;gap:8px;flex-wrap:wrap;align-items:center}
.nav-toggle{display:none}

/* ---------- 레이아웃 ---------- */
.course-layout{display:grid;grid-template-columns:280px minmax(0,1fr);gap:16px;align-items:start}
.sidebar{padding:14px;position:sticky;top:12px;max-height:calc(100vh - 24px);overflow:auto}
.stage{margin-bottom:12px}
.stage:last-child{margin-bottom:0}
.stage-title{display:flex;align-items:center;gap:8px;font-weight:700;font-size:13.5px;padding:6px 8px;border-radius:var(--r-sm);color:var(--ink)}
.stage-title .sn{width:24px;height:24px;border-radius:7px;display:grid;place-items:center;font-size:11.5px;font-weight:700;color:#fff;flex:none}
.stage-title .sn .ce-ico{width:14px;height:14px}
.stage-title .sub{font-weight:400;font-size:12px;color:var(--ink-3)}
.stage-title .st-sub{font-weight:500;color:var(--ink-3);font-size:12px;margin-left:auto}
.lsn{display:flex;align-items:center;gap:8px;width:100%;text-align:left;border:none;background:none;color:var(--ink);padding:8px 8px 8px 14px;border-radius:var(--r-sm);cursor:pointer;font-size:13.5px;line-height:1.35;border-left:3px solid transparent;transition:background .15s}
.lsn:hover{background:var(--bg-alt)}
.lsn.cur{background:var(--navy-soft);font-weight:700;border-left-color:var(--stage,var(--navy))}
.lsn .mark{width:18px;height:18px;border-radius:50%;border:1.5px solid var(--line);display:grid;place-items:center;flex:none;color:#fff}
.lsn .mark .ce-ico{width:12px;height:12px;stroke-width:2.6}
.lsn.done .mark{background:var(--ok);border-color:var(--ok)}
.lsn .t{flex:1;word-break:keep-all}
.lsn .min{font-size:11.5px;color:var(--ink-3);white-space:nowrap}

/* ---------- 레슨 ---------- */
.lesson{padding:26px 28px;min-height:520px;min-width:0}
.lesson-head{margin-bottom:16px}
.lesson-head .eyebrow{display:flex;align-items:center;gap:6px;margin-bottom:4px;flex-wrap:wrap}
.lesson-head .eyebrow .dot{width:9px;height:9px;border-radius:50%;flex:none}
.lesson-head h2{font-size:24px;font-weight:700;letter-spacing:-.02em;margin:0 0 10px;line-height:1.35;word-break:keep-all}
.goal{display:flex;gap:10px;align-items:flex-start;padding:12px 14px;border-radius:var(--r-md);background:var(--bg-alt);border:1px solid var(--line-2);font-size:14.5px;line-height:1.6}
.goal .ce-ico{color:var(--accent);width:18px;height:18px;margin-top:2px}
.lesson-body{font-size:15px;line-height:1.75;word-break:keep-all}
.lesson-body p{margin:8px 0}
.lesson-body b,.lesson-body strong{color:var(--ink)}
.lesson-body ul,.lesson-body ol{margin:6px 0 10px;padding-left:20px}
.lesson-body li{margin:3px 0}
.lesson-body h4{margin:18px 0 8px;font-size:15.5px}
.lesson-body code{font-family:var(--mono);font-size:.88em;background:var(--bg-alt);border:1px solid var(--line-2);border-radius:5px;padding:0 5px}
.lesson-body a{color:var(--accent)}

.stepper{display:flex;gap:6px;flex-wrap:wrap;align-items:center;margin:18px 0 14px}
.stepper button{border:1px solid var(--line);background:var(--surface);color:var(--ink-2);width:32px;height:32px;border-radius:50%;font-size:12.5px;cursor:pointer;font-weight:700;transition:background .15s,border-color .15s}
.stepper button:hover{border-color:var(--accent)}
.stepper button.cur{background:var(--navy);color:var(--on-navy);border-color:var(--navy)}
.stepper button.past{background:var(--ok-soft);color:var(--ok);border-color:transparent}
.stepper .stepper-name{font-size:13.5px;color:var(--ink-2);margin-left:6px}

.step-grid{display:grid;grid-template-columns:minmax(300px,.9fr) minmax(380px,1.35fr);gap:20px;align-items:start}
.step-guide{font-size:15px;line-height:1.75;min-width:0}
.step-guide .stitle{font-size:17px;font-weight:700;margin:0 0 6px;display:flex;gap:8px;align-items:center;letter-spacing:-.01em;word-break:keep-all}
.step-guide .stitle .sno{width:26px;height:26px;border-radius:8px;background:var(--navy);color:var(--on-navy);display:grid;place-items:center;font-size:12.5px;flex:none}
/* 번호 붙인 동작 목록 — 작성자가 <ol class="acts"><li><span class="n">1</span><span>…</span></li></ol> 로 쓴다 */
.step-guide ol.acts,.lesson-body ol.acts{padding-left:0;list-style:none;margin:8px 0}
.step-guide ol.acts li,.lesson-body ol.acts li{display:flex;gap:8px;margin:5px 0;align-items:flex-start}
.step-guide ol.acts .n,.lesson-body ol.acts .n{flex:none;width:20px;height:20px;border-radius:50%;background:var(--mark);color:#fff;font-size:11px;font-weight:700;display:grid;place-items:center;margin-top:4px}

/* 팁: why(왜) · info(참고) · warn(주의) */
.tip{display:flex;gap:10px;align-items:flex-start;margin:12px 0;padding:11px 13px;border-radius:var(--r-sm);font-size:14px;line-height:1.6;border-left:4px solid var(--accent);background:var(--accent-soft);word-break:keep-all}
.tip > .ce-ico{margin-top:3px;color:var(--accent)}
.tip.why{border-left-color:var(--ok);background:var(--ok-soft)}
.tip.why > .ce-ico{color:var(--ok)}
.tip.warn{border-left-color:var(--warn);background:var(--warn-soft)}
.tip.warn > .ce-ico{color:var(--warn)}
.tip b{margin-right:2px}

/* 복사 상자 */
.copybox{margin:12px 0;border:1px solid var(--line);border-radius:var(--r-md);background:var(--surface-2);overflow:hidden}
.copybox .cb-head{display:flex;justify-content:space-between;align-items:center;gap:8px;padding:6px 8px 6px 12px;font-size:12.5px;color:var(--ink-2);border-bottom:1px solid var(--line-2);background:var(--surface)}
.copybox .cb-head > span{display:inline-flex;align-items:center;gap:6px;min-width:0}
.copybox pre{margin:0;padding:12px 14px;font-size:13px;line-height:1.6;white-space:pre-wrap;word-break:break-word;font-family:var(--mono);max-height:320px;overflow:auto;color:var(--ink)}
.copybox.prompt pre{font-family:var(--font);font-size:14px}
.copybox .cb-btn{display:inline-flex;align-items:center;gap:5px;border:1px solid var(--line);background:var(--surface);border-radius:var(--r-sm);padding:5px 11px;font-size:12.5px;font-weight:600;cursor:pointer;color:var(--ink);transition:border-color .15s}
.copybox .cb-btn:hover{border-color:var(--accent)}
.copybox .cb-btn .ce-ico{width:14px;height:14px}

.step-nav{display:flex;justify-content:space-between;gap:8px;margin-top:18px;flex-wrap:wrap}
.step-nav .grow{flex:1}

/* ---------- 화면 영역 ---------- */
.screen-wrap{position:sticky;top:12px;min-width:0}
.screen-label{font-size:12px;color:var(--ink-3);margin-bottom:6px;display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:6px}
.screen-label > span:first-child{display:inline-flex;align-items:center;gap:6px;flex-wrap:wrap}
.screen-label .ce-ico{width:14px;height:14px}
.screen-tools{display:inline-flex;gap:8px;align-items:center;flex-wrap:wrap}
.os-tag{display:inline-flex;align-items:center;gap:4px;font-size:11px;padding:1px 8px;border-radius:999px;background:var(--line-2);color:var(--ink-2)}
.os-tag .ce-ico{width:11px;height:11px}
.real-link{display:inline-flex;align-items:center;gap:4px;color:var(--accent);text-decoration:none;font-weight:600}
.real-link:hover{text-decoration:underline}
.replay-btn{display:inline-flex;align-items:center;gap:4px;border:1px solid var(--line);background:var(--surface);border-radius:999px;font-size:11.5px;padding:3px 10px;cursor:pointer;color:var(--ink)}
.replay-btn:hover{border-color:var(--accent)}
.replay-btn .ce-ico{width:11px;height:11px}
.view-seg{display:inline-flex;align-items:center;gap:2px;padding:2px;border:1px solid var(--line);border-radius:999px;background:var(--surface)}
.view-seg button{display:inline-flex;align-items:center;gap:4px;border:none;background:transparent;font-size:11.5px;line-height:1;padding:5px 10px;border-radius:999px;cursor:pointer;color:var(--ink-2);white-space:nowrap}
.view-seg button.on{background:var(--navy);color:var(--on-navy);font-weight:700}
.view-seg .ce-ico{width:12px;height:12px}

/* 브라우저 틀 — 실제 서비스 화면을 흉내 내므로 틀은 늘 밝게 */
.browser{border-radius:12px;overflow:hidden;border:1px solid #cfd3da;background:#fff;box-shadow:0 12px 30px rgba(15,27,45,.14);color:#202124;font-size:12px;line-height:1.45;font-family:var(--font)}
.browser *{box-sizing:border-box}
.b-top{display:flex;align-items:center;gap:8px;padding:7px 10px;background:#dfe3ea;border-bottom:1px solid #c9cdd5}
.b-dots span{display:inline-block;width:10px;height:10px;border-radius:50%;margin-right:4px}
.b-url{flex:1;background:#fff;border-radius:999px;padding:4px 12px;font-size:11.5px;color:#4b5563;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;min-width:0}
.b-body{min-height:340px;position:relative;overflow:hidden}
.b-body:has(.real-shot){min-height:0}
.b-ext{color:#6b7280;font-size:13px;padding:0 4px}
.browser.win .b-top.win{justify-content:space-between;padding:6px 8px 0;background:#e8ebef;border-bottom:none}
.browser.win .b-tab{background:#fff;border-radius:8px 8px 0 0;padding:6px 14px;font-size:11.5px;color:#1f2937;max-width:60%;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.b-winctl i{font-style:normal;font-size:10px;color:#4b5563;margin-left:14px}
.browser.win .b-nav{display:flex;align-items:center;gap:8px;padding:6px 10px;background:#fff;border-bottom:1px solid #dfe3ea}
.browser.win .b-arrows{color:#6b7280;font-size:13px;letter-spacing:.2em}
.browser.win .b-url{background:#f1f3f4}
.m-muted{color:#6b7280}

/* 번호 강조 · 커서 재생 */
.hl{position:relative;outline:3px solid var(--mark) !important;outline-offset:2px;border-radius:6px;animation:ce-pulse 1.4s infinite;z-index:2}
.hl::after{content:attr(data-n);position:absolute;top:-11px;left:-11px;width:20px;height:20px;border-radius:50%;background:var(--mark);color:#fff;font-size:11px;font-weight:700;display:grid;place-items:center;font-family:var(--font);box-shadow:0 2px 6px rgba(0,0,0,.25)}
@keyframes ce-pulse{0%,100%{box-shadow:0 0 0 0 var(--mark-glow)}60%{box-shadow:0 0 0 9px transparent}}
.hl.clicked{background-color:var(--mark-fill) !important;animation:none}
.cursor{position:absolute;left:0;top:0;width:22px;height:22px;pointer-events:none;z-index:9;filter:drop-shadow(0 2px 3px rgba(0,0,0,.35));transition:opacity .5s}
.cursor svg{width:100%;height:100%;display:block}
.cursor.click::after{content:'';position:absolute;left:-9px;top:-9px;width:36px;height:36px;border-radius:50%;border:3px solid var(--mark);animation:ce-ripple .32s ease-out forwards}
.cursor.fade{opacity:0}
@keyframes ce-ripple{0%{transform:scale(.3);opacity:1}100%{transform:scale(1.4);opacity:0}}

/* 실제 캡처 */
.real-shot{position:relative;background:#fff;cursor:zoom-in}
.real-shot img{display:block;width:100%;height:auto}
.real-hl{position:absolute;border-radius:6px}
.real-tag{position:absolute;right:8px;bottom:8px;display:inline-flex;align-items:center;gap:4px;font-size:10.5px;padding:2px 8px;border-radius:999px;background:rgba(15,27,45,.74);color:#fff;pointer-events:none}
.real-tag .ce-ico{width:11px;height:11px}
.step-grid.real-mode{grid-template-columns:1fr}
.step-grid.real-mode .screen-wrap{position:static}
.lightbox{position:fixed;inset:0;background:rgba(11,20,32,.88);z-index:200;display:grid;place-items:center;padding:20px;cursor:zoom-out}
.lightbox .real-shot{width:min(96vw,1400px);cursor:zoom-out;border-radius:8px;overflow:hidden;box-shadow:0 30px 80px rgba(0,0,0,.5)}
.lightbox .real-hl{animation:none}
.lightbox .hint{position:absolute;bottom:14px;left:50%;transform:translateX(-50%);color:#fff;font-size:13px;opacity:.85}

/* 개념 그림 — 테마를 따른다 */
.browser.dg{background:var(--surface);border-color:var(--line);color:var(--ink);box-shadow:var(--shadow)}
.diagram{background:var(--surface);min-height:300px;padding:20px;display:flex;flex-direction:column;justify-content:center;gap:12px;color:var(--ink);font-size:13px}
.dg-row{display:flex;align-items:center;gap:10px;justify-content:center;flex-wrap:wrap}
.dg-box{border:1.5px solid var(--line);border-radius:var(--r-md);padding:10px 14px;min-width:110px;text-align:center;font-size:12.5px;background:var(--surface-2);color:var(--ink-2)}
.dg-box b{display:block;font-size:13.5px;margin-bottom:2px;color:var(--ink)}
.dg-box.acc{border-color:var(--accent);background:var(--accent-soft)}
.dg-arrow{font-size:20px;color:var(--ink-3)}
.dg-note{text-align:center;font-size:12px;color:var(--ink-3)}

/* 완성 앱 단독 */
.app-only{background:#f3f4f6;min-height:340px;padding:18px;display:grid;place-items:center}
.app-only-in{width:min(100%,360px)}

/* 터미널 · 편집기 모형 (어두운 화면이 원래 모습) */
.browser.term{background:#0c0c0c;color:#e5e7eb;border-color:#2a2f3a;font-family:var(--mono);font-size:11.5px;line-height:1.55}
.t-top{display:flex;align-items:center;gap:8px;padding:6px 10px;background:#1f2430;border-bottom:1px solid #2a2f3a;color:#cbd5e1;font-size:11px;font-family:var(--font)}
.t-top.mac{justify-content:space-between}
.t-top .t-title{flex:1;text-align:center;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;min-width:0}
.t-top.win{justify-content:space-between;padding:4px 6px 0;border-bottom:none}
.t-top.win .t-tab{display:inline-flex;align-items:center;gap:6px;background:#0c0c0c;border-radius:6px 6px 0 0;padding:5px 12px;font-size:11px;color:#e5e7eb;white-space:nowrap}
.t-top.win .t-tab .ce-ico{width:12px;height:12px}
.t-top.win .t-tab i{font-style:normal;opacity:.6;margin-left:6px}
.t-top.win .t-plus{flex:1;padding-left:8px;opacity:.7}
.t-top.win .b-winctl i{color:#cbd5e1}
.t-top.win.ed{padding:5px 8px;background:#2b2d31;border-bottom:1px solid #1e1f22}
.t-top.win.ed .e-menu{white-space:nowrap;font-size:10.5px;opacity:.85}
.tbody{padding:10px 12px;min-height:300px}
.tlines{white-space:pre-wrap;word-break:break-word}
.tl{padding:1px 4px;border-radius:4px;margin:0 -4px}
.tl.cmd .tp{color:#7dd3fc}.tl.cmd .td{color:#c4b5fd}.tl.cmd .tc{color:#fff;font-weight:600}
.tl.ok{color:#86efac}.tl.err{color:#fca5a5}.tl.dim{color:#6b7280}.tl.out{color:#d1d5db}
.tl.ai{color:#e5e7eb}.tl.ai .tdot{color:#4FB3C9}.tl.tool .tdot.tool{color:#86efac}
.tl.me{color:#fff}.tl .tprompt{color:#4FB3C9;font-weight:700}
.tl.hl{outline-offset:0}
.tinput{border:1px solid #3f4653;border-radius:6px;padding:6px 10px;margin:6px 0;color:#fff;background:#111318}
.tcaret{animation:ce-blink 1s steps(1) infinite;color:#fff}
@keyframes ce-blink{50%{opacity:0}}
.tbox{border:1px solid #4b5563;border-radius:6px;padding:8px 12px;margin:6px 0;color:#e5e7eb;background:#111318}
.tbox b{color:#fbbf24}
.task{border:1px solid #4FB3C9;border-radius:6px;padding:8px 12px;margin:6px 0;background:#0f1a1e}
.task .sel{color:#fff;font-weight:700}.task .opt{color:#9ca3af}
.browser.ed{font-size:11px}
.ebody{display:grid;grid-template-columns:150px minmax(0,1fr);min-height:320px;background:#1e1f22;color:#d4d4d4;font-family:var(--font)}
.ebody.with-chat{grid-template-columns:140px minmax(0,1fr) 230px}
.eside{background:#181818;border-right:1px solid #2b2d31;padding:6px 0;font-size:10.5px}
.es-head{padding:4px 10px;letter-spacing:.08em;color:#9ca3af;font-size:9.5px}
.es-proj{padding:3px 10px;font-weight:700;color:#e5e7eb}
.ef{display:flex;align-items:center;gap:5px;padding:2px 10px 2px 18px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;color:#cbd5e1}
.ef .ce-ico{width:12px;height:12px;opacity:.8}
.ef.on{background:#2a2d2e;color:#fff}
.emain{display:flex;flex-direction:column;min-width:0}
.etabs{display:flex;background:#181818;border-bottom:1px solid #2b2d31}
.etabs span{padding:5px 12px;font-size:10.5px;color:#9ca3af}.etabs span.on{background:#1e1f22;color:#fff;border-top:1px solid #4FB3C9}
.ecode{margin:0;padding:10px 12px;font-family:var(--mono);font-size:10.5px;line-height:1.5;color:#d4d4d4;white-space:pre-wrap;word-break:break-word;flex:1;max-height:240px;overflow:hidden}
.eterm{border-top:1px solid #2b2d31;background:#181818;padding:4px 10px 8px;font-family:var(--mono);font-size:10.5px}
.et-head{display:flex;gap:14px;font-size:9.5px;letter-spacing:.08em;color:#9ca3af;padding:2px 0 6px;font-family:var(--font)}
.et-head span:first-child{color:#fff;border-bottom:1px solid #fff}
.echat{border-left:1px solid #2b2d31;background:#181818;display:flex;flex-direction:column;min-width:0}
.ec-head{display:flex;justify-content:space-between;padding:6px 10px;border-bottom:1px solid #2b2d31;font-size:10.5px;color:#e5e7eb}
.ec-msgs{flex:1;padding:8px;display:flex;flex-direction:column;gap:6px;overflow:hidden}
.ecm{font-size:10.5px;line-height:1.5;padding:6px 8px;border-radius:8px;background:#26282d;color:#d4d4d4}
.ecm.me{background:#2f3340;color:#fff;align-self:flex-end;max-width:92%}
.ec-diff{display:flex;justify-content:space-between;align-items:center;gap:6px;margin:0 8px 6px;padding:6px 8px;border:1px solid #3f4653;border-radius:6px;font-size:10px;color:#cbd5e1}
.ec-accept{background:#0E7490;color:#fff;border-radius:5px;padding:2px 8px;font-size:10.5px;white-space:nowrap}
.ec-input{margin:6px 8px 8px;border:1px solid #3f4653;border-radius:8px;padding:6px 8px;font-size:10.5px;color:#fff;display:flex;justify-content:space-between;gap:6px;background:#111318}
.ec-input .send{color:#4FB3C9}

/* ---------- 체크리스트 · 퀴즈 · 완료 ---------- */
.finish{margin-top:22px;border-top:1px dashed var(--line);padding-top:18px}
.finish h4{display:flex;align-items:center;gap:8px;margin:0 0 8px;font-size:16px}
.finish h4 .ce-ico{color:var(--accent);width:18px;height:18px}
.check{display:flex;gap:10px;align-items:flex-start;padding:8px 10px;border-radius:var(--r-sm);cursor:pointer;font-size:14.5px;word-break:keep-all}
.check:hover{background:var(--bg-alt)}
.check input{margin-top:5px;width:16px;height:16px;accent-color:var(--navy);flex:none}
.quiz{margin:14px 0;padding:16px;border:1px solid var(--line);border-radius:var(--r-md);background:var(--surface-2)}
.quiz .qq{display:flex;gap:8px;align-items:flex-start;font-weight:700;margin-bottom:10px;word-break:keep-all}
.quiz .qq .ce-ico{color:var(--accent);margin-top:4px}
.quiz .qo{display:block;width:100%;text-align:left;padding:10px 14px;margin:6px 0;border:1px solid var(--line);border-radius:var(--r-sm);background:var(--surface);color:var(--ink);cursor:pointer;font-size:14.5px;transition:border-color .15s;word-break:keep-all}
.quiz .qo:hover{border-color:var(--accent)}
.quiz .qo.right{border-color:var(--ok);background:var(--ok-soft)}
.quiz .qo.wrong{border-color:var(--danger);background:var(--danger-soft)}
.quiz .exp{margin-top:8px;font-size:14px;color:var(--ink-2);word-break:keep-all}
.quiz .exp:empty{display:none}
.done-banner{display:flex;gap:12px;align-items:center;flex-wrap:wrap;padding:14px 16px;border-radius:var(--r-md);background:var(--ok-soft);border:1px solid var(--ok);margin-top:12px}
.done-banner > .ce-ico{width:26px;height:26px;color:var(--ok)}
.done-banner .grow{flex:1}

/* 토스트 */
.toast{position:fixed;bottom:22px;left:50%;transform:translateX(-50%);background:var(--ink);color:var(--bg);padding:10px 18px;border-radius:999px;font-size:14px;z-index:300;box-shadow:var(--shadow);max-width:calc(100vw - 32px);text-align:center}
.ce-foot{padding:24px 4px 0;font-size:13px;color:var(--ink-3);text-align:center;word-break:keep-all}

/* ================= 수료증 ================= */
.cert-zone{margin-top:22px;padding:20px 22px;border:1px solid var(--line);border-radius:var(--r-lg);background:var(--surface-2)}
.cert-zone > h3{display:flex;align-items:center;gap:8px;margin:0 0 4px;font-size:18px}
.cert-zone > h3 .ce-ico{color:var(--accent);width:20px;height:20px}
.cert-tools{display:flex;gap:8px;flex-wrap:wrap;align-items:flex-end;margin-top:14px}
.cert-tools .f{display:flex;flex-direction:column;gap:4px;font-size:13px;color:var(--ink-2);flex:1;min-width:150px}
.cert-tools input{font-size:15px;min-height:44px;padding:0 12px;border:1px solid var(--line);border-radius:var(--r-md);background:var(--surface);color:var(--ink)}
.cert-tools input:focus{outline:2px solid var(--accent);outline-offset:0;border-color:var(--accent)}
.cert-actions{display:flex;gap:8px;flex-wrap:wrap;align-items:center;margin:14px 0 4px}

.cert-wrap{margin-top:16px;overflow-x:auto;padding-bottom:2px}
.cert-sheet{container-type:inline-size;position:relative;width:100%;min-width:620px;aspect-ratio:297/210;overflow:hidden;
  background:var(--cert-paper);color:var(--cert-ink);border-radius:4px;box-shadow:0 18px 44px rgba(15,27,45,.22),0 2px 6px rgba(15,27,45,.12);font-family:var(--font)}
.cert-sheet::before{content:'';position:absolute;inset:0;pointer-events:none;
  background-image:radial-gradient(var(--cert-tint) 1px,transparent 1px);background-size:1.2cqw 1.2cqw}
.cert-band{position:absolute;left:0;right:0;top:0;height:1.1cqw;background:var(--cert-frame)}
.cert-frame{position:absolute;inset:2.6cqw;border:0.28cqw solid var(--cert-frame);border-radius:2px}
.cert-frame::after{content:'';position:absolute;inset:0.6cqw;border:0.1cqw solid var(--cert-line)}
.cert-body{position:relative;z-index:2;height:100%;padding:5.8cqw 8.4cqw 6.4cqw;display:flex;flex-direction:column}
.cert-no{position:absolute;top:4.4cqw;left:8.4cqw;font-size:1.3cqw;letter-spacing:.06em;color:var(--cert-ink-3);font-family:var(--mono)}
.cert-emblem{display:flex;align-items:center;justify-content:center;gap:1cqw;margin-bottom:1.1cqw}
.cert-emblem .ico{width:3.6cqw;height:3.6cqw;border-radius:0.8cqw;background:var(--cert-frame);display:grid;place-items:center;color:#fff}
.cert-emblem .ico svg{width:62%;height:62%}
.cert-emblem .org{font-size:1.6cqw;letter-spacing:.3em;color:var(--cert-ink-2);font-weight:700}
.cert-title{text-align:center;font-size:5.4cqw;font-weight:800;letter-spacing:.34em;text-indent:.34em;color:var(--cert-frame);line-height:1.05;margin:0}
.cert-sub{text-align:center;font-size:1.25cqw;letter-spacing:.42em;text-indent:.42em;color:var(--cert-accent);margin-top:.9cqw;font-weight:600}
.cert-rule{width:14cqw;height:0.2cqw;background:var(--cert-accent);margin:1.2cqw auto 0}
.cert-fields{margin:1.8cqw auto 0;width:100%;max-width:74cqw;border-collapse:collapse;font-size:1.7cqw}
.cert-fields th,.cert-fields td{padding:.55cqw 1.2cqw;text-align:left;vertical-align:middle;border-bottom:0.09cqw solid var(--cert-line)}
.cert-fields th{width:16cqw;font-weight:700;color:var(--cert-ink-3);letter-spacing:.24em;font-size:1.4cqw}
.cert-fields td{color:var(--cert-ink);font-weight:500}
.cert-fields td b{font-weight:800}
.cert-fields .nm{font-size:2.5cqw;font-weight:800;letter-spacing:.1em}
.cert-text{margin-top:auto;padding-top:1.2cqw;text-align:center;font-size:1.6cqw;line-height:1.7;color:var(--cert-ink)}
.cert-date{text-align:center;font-size:1.7cqw;letter-spacing:.2em;margin-top:1.1cqw;color:var(--cert-ink)}
.cert-sign{display:flex;align-items:center;justify-content:center;gap:1.1cqw;margin-top:1cqw}
.cert-sign .who{font-size:2.1cqw;font-weight:800;letter-spacing:.18em;color:var(--cert-ink)}
.cert-seal{width:6cqw;height:6cqw;flex:none;color:var(--cert-seal)}
.cert-seal svg{width:100%;height:100%;display:block}
.cert-foot{margin-top:1.2cqw;display:flex;justify-content:space-between;font-size:1.08cqw;color:var(--cert-ink-3);letter-spacing:.04em}
@supports not (container-type: inline-size){
  .cert-title{font-size:60px}.cert-sub{font-size:12px}.cert-fields{font-size:15px;max-width:none}
  .cert-fields th{font-size:13px;width:130px}.cert-fields .nm{font-size:26px}
  .cert-text{font-size:15px}.cert-date{font-size:16px}.cert-sign .who{font-size:20px}
  .cert-no,.cert-foot{font-size:11px}.cert-emblem .org{font-size:14px}.cert-emblem .ico{width:32px;height:32px}
  .cert-seal{width:64px;height:64px}.cert-body{padding:52px 66px 42px}.cert-frame{inset:20px;border-width:3px}.cert-band{height:10px}
}

/* ---------- 반응형 ---------- */
@media (max-width:1100px){
  .step-grid{grid-template-columns:1fr}
  .screen-wrap{position:static}
}
@media (max-width:900px){
  .ce-app{padding:16px 16px 48px}
  .ce-top h1{font-size:22px}
  .h1-ico{width:34px;height:34px}
  .ce-intro{grid-template-columns:1fr;padding:22px 18px;gap:20px}
  .course-layout{grid-template-columns:1fr}
  .nav-toggle{display:inline-flex}
  .sidebar{position:static;max-height:none;display:none}
  .course-layout.nav-open .sidebar{display:block}
  .lesson{padding:20px 16px}
  .lesson-head h2{font-size:21px}
  .course-bar{padding:12px 14px;gap:12px}
  .course-actions{width:100%}
  .course-actions .btn{flex:1}
  .ebody,.ebody.with-chat{grid-template-columns:1fr}
  .eside,.echat{display:none}
  .cert-zone{padding:16px 14px}
}
@media (prefers-reduced-motion: reduce){
  .hl{animation:none}
  *{transition:none !important}
}

/* ---------- 인쇄: A4 가로 한 장에 수료증만 ----------
   엔진이 인쇄 직전 .cert-wrap 을 body 바로 아래 #printRoot 로 옮기고 body.printing 을 붙인다 */
@page{size:A4 landscape;margin:0}
@media print{
  html,body{margin:0 !important;padding:0 !important;background:#fff !important}
  body.printing > *{display:none !important}
  body.printing > #printRoot{display:block !important}
  #printRoot{position:absolute;inset:0;margin:0;padding:0}
  #printRoot .cert-wrap{margin:0;overflow:visible;padding:0}
  #printRoot .cert-sheet{min-width:0 !important;width:297mm !important;height:210mm !important;aspect-ratio:auto !important;
    border-radius:0 !important;box-shadow:none !important;-webkit-print-color-adjust:exact;print-color-adjust:exact;break-inside:avoid;page-break-inside:avoid}
  body:not(.printing) .ce-top-r,body:not(.printing) .course-bar,body:not(.printing) .sidebar,body:not(.printing) .toast{display:none !important}
}