/* 프로젝터 강의용 — 큰 글씨·높은 대비·넉넉한 여백. --fs로 전체 배율 조절(A- A A+). */
:root{--fs:19px;--ink:#12151b;--head:#0a0d12;--muted:#454c56;--line:#dce1e7;
  --accent:#c2410c;--accent2:#e2502a;--surface:#f4f6f8;--note:#eef4fb;--note-bar:#2f6fb3;--note-ink:#204c78;}
*{box-sizing:border-box;}
html{scroll-behavior:smooth;font-size:var(--fs);}
body{font-family:'Pretendard','Apple SD Gothic Neo',system-ui,sans-serif;color:var(--ink);
  font-size:1rem;line-height:1.85;letter-spacing:-.003em;margin:0;background:#fff;
  word-break:keep-all;overflow-wrap:break-word;-webkit-font-smoothing:antialiased;}
a{color:var(--accent);text-decoration:none;}a:hover{text-decoration:underline;}
.wrap{max-width:960px;margin:0 auto;padding:16px 40px 140px;}

/* 상단 네비 바 */
.nav{position:sticky;top:0;z-index:5;background:rgba(255,255,255,.96);backdrop-filter:blur(6px);
  border-bottom:1.5px solid var(--line);margin:0 -40px 20px;padding:13px 40px;
  display:flex;align-items:center;gap:10px;font-size:.82rem;}
.nav .home{font-weight:800;color:var(--head);letter-spacing:-.02em;font-size:.9rem;}
.nav .spacer{flex:1;}
.nav a.btn{padding:8px 15px;border:1.5px solid var(--line);border-radius:9px;color:var(--ink);
  background:#fff;white-space:nowrap;font-weight:600;}
.nav a.btn:hover{border-color:var(--accent);color:var(--accent);text-decoration:none;}
.nav a.btn.disabled{opacity:.32;pointer-events:none;}
/* 글자 크기 조절 */
.fs{display:flex;gap:4px;align-items:center;margin-right:4px;}
.fs button{width:34px;height:34px;border:1.5px solid var(--line);border-radius:8px;background:#fff;
  color:var(--ink);font-weight:700;cursor:pointer;line-height:1;padding:0;}
.fs button:hover{border-color:var(--accent);color:var(--accent);}
.fs .lab{font-size:.72rem;color:var(--muted);margin-right:2px;}

/* ===== index ===== */
.cover{padding:40px 0 30px;border-bottom:3px solid var(--head);}
.cover h1{font-size:2.6rem;font-weight:800;letter-spacing:-.03em;margin:0;color:var(--head);}
.cover .sub{color:var(--muted);font-size:1.05rem;margin-top:16px;}
.cover .meta{color:var(--muted);font-size:.9rem;margin-top:18px;}
.dayband{margin:40px 0 16px;font-size:.95rem;font-weight:800;color:var(--accent);letter-spacing:.05em;
  padding-bottom:9px;border-bottom:2px solid var(--line);}
.tocgrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:14px;}
.card{display:block;padding:18px 20px;background:#fff;border:1.5px solid var(--line);border-radius:13px;
  color:var(--ink);transition:.12s;}
.card:hover{border-color:var(--accent);box-shadow:0 4px 18px rgba(194,65,12,.1);text-decoration:none;transform:translateY(-2px);}
.card .cn{font-size:.78rem;font-weight:800;color:var(--accent);letter-spacing:.03em;}
.card .ct{font-size:1.02rem;font-weight:700;margin-top:6px;line-height:1.5;color:var(--head);}

/* ===== 본문 ===== */
h1{font-size:2rem;font-weight:800;letter-spacing:-.025em;margin:20px 0 22px;padding-bottom:16px;
  border-bottom:3px solid var(--head);color:var(--head);line-height:1.3;}
h2{font-size:1.4rem;font-weight:800;margin:44px 0 14px;padding-top:14px;border-top:3px solid var(--accent);
  letter-spacing:-.015em;color:var(--head);line-height:1.4;}
h3{font-size:1.14rem;font-weight:700;color:var(--head);margin:32px 0 10px;}
h4{font-size:1.02rem;font-weight:700;margin:22px 0 8px;color:var(--head);}
p{margin:0 0 15px;}
ul,ol{margin:12px 0 18px;padding-left:26px;}li{margin:0 0 9px;}
strong{font-weight:700;color:#000;}
hr{border:none;border-top:1.5px solid var(--line);margin:34px 0;}
/* 표 — 프로젝터에서 읽히게 크게 */
table{border-collapse:collapse;width:100%;margin:20px 0;font-size:.95rem;display:block;overflow-x:auto;}
th{background:#eef1f4;font-weight:700;text-align:left;color:var(--head);
  border-top:2px solid var(--head);border-bottom:1.5px solid #c2c9d2;padding:12px 15px;white-space:nowrap;}
td{border-bottom:1px solid #e6eaef;padding:12px 15px;vertical-align:top;line-height:1.65;}
tbody tr:last-child td{border-bottom:2px solid var(--head);}
tbody tr:hover td{background:#fafbfc;}
/* 코드 */
code{font-family:'D2Coding','SF Mono',ui-monospace,monospace;font-size:.92em;background:#eaeef2;
  border-radius:5px;padding:2px 6px;color:#0d47a1;}
pre{font-family:'D2Coding','SF Mono',ui-monospace,monospace;font-size:.92rem;line-height:1.7;
  background:var(--surface);border:1.5px solid var(--line);border-radius:10px;padding:18px 20px;
  overflow-x:auto;margin:20px 0;}
pre code{background:none;padding:0;font-size:inherit;color:var(--ink);}
/* 터미널 명령 — 앞의 $ 는 표시용(선택·복사되지 않는다) */
pre.term{background:#10151c;border-color:#10151c;}
pre.term code{color:#e8edf3;}
.ps{color:#7f8b99;user-select:none;-webkit-user-select:none;}
/* 터미널 명령 상자 — 복사 버튼 (복사되는 글에는 $ 가 없다) */
.termbox{margin:20px 0;border-radius:10px;overflow:hidden;border:1.5px solid #10151c;}
.termbox .prompt-bar{background:#1b222c;border-bottom:1px solid #2b3440;
  display:flex;align-items:center;justify-content:space-between;padding:8px 12px 8px 18px;}
.termbox .prompt-lab{font-size:.74rem;font-weight:800;letter-spacing:.06em;color:#7fd7ee;}
.termbox button.copy{border-color:#3d4854;background:transparent;color:#9fe3f5;}
.termbox button.copy:hover{background:#5be3ff;border-color:#5be3ff;color:#0b1220;}
.termbox button.copy.done{background:#1f7a4d;border-color:#1f7a4d;color:#fff;}
.termbox pre.term{margin:0;border:none;border-radius:0;}
/* AI에게 입력하는 프롬프트 — 복사 버튼 */
.prompt{margin:20px 0;border:1.5px solid #f0cdbd;border-left:6px solid var(--accent);border-radius:10px;
  background:#fffaf7;overflow:hidden;}
.prompt-bar{display:flex;align-items:center;justify-content:space-between;padding:8px 12px 8px 18px;
  border-bottom:1.5px solid #f6e0d5;background:#fdf1ea;}
.prompt-lab{font-size:.74rem;font-weight:800;letter-spacing:.06em;color:var(--accent);}
.prompt pre{margin:0;border:none;border-radius:0;background:transparent;white-space:pre-wrap;
  word-break:break-word;}
button.copy{font:inherit;font-size:.78rem;font-weight:700;padding:5px 14px;border:1.5px solid #e9bfa9;
  border-radius:7px;background:#fff;color:var(--accent);cursor:pointer;line-height:1.4;}
button.copy:hover{background:var(--accent);border-color:var(--accent);color:#fff;}
button.copy.done{background:#1f7a4d;border-color:#1f7a4d;color:#fff;}
/* 인용: 요약 / 강의 노트 — 프로젝터에서 확실히 구분 */
blockquote{margin:22px 0;border-radius:10px;}
blockquote.intro{padding:18px 24px;background:#fdf3ee;border-left:6px solid var(--accent2);
  font-weight:500;font-size:1.03rem;}
blockquote.intro p,blockquote.note p{margin:0 0 8px;}
blockquote.intro p:last-child,blockquote.note p:last-child{margin:0;}
blockquote.note{padding:18px 24px;background:var(--note);border-left:6px solid var(--note-bar);}
blockquote.note strong:first-child{color:var(--note-ink);}
/* [잠깐] — 건너뛰면 실습이 깨지는 안내(예: Claude Code 재시작). 가장 눈에 띄게 */
blockquote.stop{padding:18px 24px 18px 22px;background:#fff4e5;border-left:8px solid #d97706;
  box-shadow:0 2px 10px rgba(217,119,6,.13);}
blockquote.stop p{margin:0 0 8px;font-size:1.04rem;}
blockquote.stop p:last-child{margin:0;}
blockquote.stop strong:first-child{color:#b45309;}
/* 다이어그램(SVG) — 크게, 은은한 테두리 */
figure.diagram,p img{margin:28px auto;text-align:center;}
img{max-width:100%;height:auto;border:1.5px solid var(--line);border-radius:12px;background:#fff;
  display:block;margin:28px auto;box-shadow:0 2px 12px rgba(20,24,31,.05);}
/* 하단 이전/다음 */
.pager{display:flex;gap:14px;margin-top:56px;padding-top:24px;border-top:1.5px solid var(--line);}
.pager a{flex:1;padding:16px 20px;border:1.5px solid var(--line);border-radius:12px;background:#fff;
  color:var(--ink);font-size:.95rem;font-weight:600;}
.pager a:hover{border-color:var(--accent);text-decoration:none;box-shadow:0 3px 14px rgba(194,65,12,.08);}
.pager a.next{text-align:right;}
.pager a .lbl{display:block;font-size:.78rem;color:var(--muted);margin-bottom:5px;font-weight:600;}
.pager a.disabled{opacity:.32;pointer-events:none;}
/* 키보드 힌트 토스트 */
.hint{position:fixed;left:50%;bottom:24px;transform:translateX(-50%);background:var(--head);color:#fff;
  padding:10px 18px;border-radius:24px;font-size:.82rem;opacity:0;transition:opacity .3s;pointer-events:none;z-index:9;}
.hint.show{opacity:.92;}
/* 왼쪽 끝 저자 표기 — 모든 페이지, 작고 은은하게 */
.byline{position:fixed;left:9px;bottom:26px;writing-mode:vertical-rl;transform:rotate(180deg);
  font-size:.7rem;letter-spacing:.1em;color:#98a1ac;white-space:nowrap;z-index:4;pointer-events:none;}
.byline b{font-weight:700;color:#7c8592;}
/* 푸터 */
.foot{margin-top:56px;padding:26px 0 8px;border-top:1.5px solid var(--line);text-align:center;
  color:var(--muted);font-size:.82rem;line-height:1.7;}
.foot b{display:block;font-weight:800;color:var(--head);letter-spacing:.04em;}
.foot a{color:var(--muted);}
/* 도어락 잠금 화면 (index 전용) */
#doorlock{position:fixed;inset:0;z-index:9999;background:radial-gradient(1200px 600px at 50% 20%,#1c2a44,#0b1220 70%);
  display:flex;align-items:center;justify-content:center;}
#doorlock.open{display:none;}
.lock-body{width:300px;padding:26px 24px 28px;border-radius:28px;
  background:linear-gradient(180deg,#2b2f36,#14171c);box-shadow:0 30px 70px rgba(0,0,0,.6),inset 0 1px 0 rgba(255,255,255,.08);
  border:1px solid #3a404a;text-align:center;color:#dfe6ee;user-select:none;}
.lock-brand{font-size:12px;letter-spacing:.3em;color:#8e9aab;margin-bottom:10px;}
.lock-icon{font-size:38px;line-height:1;margin:2px 0 10px;}
.lock-screen{margin-bottom:16px;height:54px;border-radius:12px;background:#0a0f14;border:1px solid #2a3340;
  box-shadow:inset 0 0 18px rgba(0,200,255,.15);display:flex;align-items:center;justify-content:center;gap:14px;}
.lock-screen .dot{width:14px;height:14px;border-radius:50%;background:#1d2a36;box-shadow:inset 0 0 4px #000;}
.lock-screen .dot.on{background:#5be3ff;box-shadow:0 0 10px #5be3ff;}
.lock-pad{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;}
.lock-pad button{height:58px;border-radius:50%;border:1px solid #46505c;cursor:pointer;font-size:20px;font-weight:700;
  background:radial-gradient(circle at 35% 30%,#4a525d,#20252c);color:#eaf2ff;box-shadow:0 6px 12px rgba(0,0,0,.45),inset 0 1px 0 rgba(255,255,255,.12);}
.lock-pad button:active{transform:translateY(2px);box-shadow:0 2px 6px rgba(0,0,0,.5);}
.lock-pad button.fn{color:#5be3ff;}
.lock-body.shake{animation:lockshake .35s;}
@keyframes lockshake{0%,100%{transform:translateX(0)}25%{transform:translateX(-8px)}75%{transform:translateX(8px)}}
.lock-body.ok .lock-screen{box-shadow:inset 0 0 18px rgba(108,255,154,.35);}
.lock-body.ok .lock-screen .dot.on{background:#6cff9a;box-shadow:0 0 10px #6cff9a;}
@media print{.nav,.pager,.hint,button.copy,.byline,#doorlock{display:none;}.wrap{max-width:none;padding:0;}}
@media(max-width:640px){.byline{display:none;}.wrap{padding:12px 18px 90px;}.nav{margin:0 -18px 16px;padding:11px 18px;}
  .nav .home{display:none;}}