/* ============================================================
   eBPF DEEP DIVE — Mission Control Editorial theme adaptation
   deep navy → indigo drift + orange lead accent. No build step.
   ============================================================ */

:root {
  --ink: #0b1017;
  --squid: #161d26;
  --panel: #131a24;
  --line: #2a3543;
  --fog: #a6b2c3;
  --paper: #f3f3f7;
  --orange: #ff9900;
  --orange-hot: #ffb84d;
  --blue: #41b3ff;
  --green: #00e500;
  --pink: #ff5c85;
  --purple: #ad5cff;
  --yellow: #fbd332;
  --step: cubic-bezier(.19, 1, .22, 1);
  --disp: 'Pretendard Variable', Pretendard, -apple-system, sans-serif;
  --mono: 'JetBrains Mono', 'SF Mono', ui-monospace, monospace;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html, body {
  height: 100%; overflow: hidden;
  background: linear-gradient(118deg, #0b0d20 0%, #10123a 55%, #150f3e 100%);
}

body {
  font-family: var(--disp);
  color: var(--paper);
  -webkit-font-smoothing: antialiased;
  word-break: keep-all;
}

/* ---------- atmosphere ---------- */
.atmosphere { position: fixed; inset: 0; pointer-events: none; z-index: 0; }
.atmosphere::before {
  content: ''; position: absolute; inset: 0;
  background:
    radial-gradient(1100px 750px at 102% -8%, rgba(139, 60, 255, .16), transparent 58%),
    radial-gradient(1000px 800px at 105% 110%, rgba(65, 90, 255, .12), transparent 55%),
    radial-gradient(1200px 700px at 8% -10%, rgba(255, 153, 0, .05), transparent 60%);
}
.atmosphere::after {
  content: ''; position: absolute; inset: 0; opacity: .05; mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='240' height='240'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='240' height='240' filter='url(%23n)'/%3E%3C/svg%3E");
}
.gridlines {
  position: fixed; inset: 0; z-index: 0; pointer-events: none; opacity: .5;
  background:
    linear-gradient(to right, rgba(139,149,165,.045) 1px, transparent 1px) 0 0 / 8.333vw 100%,
    linear-gradient(to bottom, rgba(139,149,165,.03) 1px, transparent 1px) 0 0 / 100% 12.5vh;
  mask-image: radial-gradient(120% 90% at 50% 45%, #000 55%, transparent 100%);
  -webkit-mask-image: radial-gradient(120% 90% at 50% 45%, #000 55%, transparent 100%);
}

/* ---------- deck chrome ---------- */
.brandstripe {
  position: fixed; z-index: 42; top: 0; left: 0; bottom: 0; width: 6px;
  background: linear-gradient(180deg, #ff9900 0%, #ff415e 32%, #b43bf0 66%, #3b2bdb 100%);
}
.hud {
  position: fixed; z-index: 40; left: 0; right: 0; bottom: 0;
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 28px; pointer-events: none;
  font-family: var(--mono); font-size: 13px; letter-spacing: .14em;
  color: var(--fog); text-transform: uppercase;
}
.hud .brand b { color: var(--orange); }
.hud .legal { font-size: 11px; letter-spacing: .04em; text-transform: none; opacity: .75; }
.hud .brand { margin-left: auto; margin-right: 26px; }
.progress {
  position: fixed; z-index: 41; top: 0; left: 6px; height: 3px; width: 0;
  background: linear-gradient(90deg, var(--orange), var(--orange-hot));
  box-shadow: 0 0 12px rgba(255,153,0,.6);
  transition: width .45s var(--step);
}
.navbtns {
  position: fixed; z-index: 43; right: 22px; bottom: 52px; display: flex; gap: 8px;
}
.navbtns button {
  width: 38px; height: 38px; border-radius: 10px; cursor: pointer;
  background: rgba(19,26,36,.8); border: 1px solid var(--line); color: var(--fog);
  font-size: 16px; transition: border-color .25s, color .25s;
}
.navbtns button:hover { border-color: var(--orange); color: var(--orange); }

/* ---------- slides ---------- */
.slide {
  position: fixed; inset: 0; z-index: 1;
  display: flex; flex-direction: column; justify-content: center;
  padding: 4.5vh 3.8vw 7vh;
  visibility: hidden; opacity: 0; transform: translateY(14px);
  transition: opacity .55s var(--step), transform .55s var(--step), visibility 0s .55s;
}
.slide.active {
  visibility: visible; opacity: 1; transform: none; z-index: 2;
  transition: opacity .55s var(--step), transform .55s var(--step), visibility 0s 0s;
}

/* staggered child reveals */
.slide [data-a] { opacity: 0; transform: translateY(22px); }
.slide.active [data-a] {
  opacity: 1; transform: none;
  transition: opacity .7s var(--step), transform .7s var(--step);
}
.slide.active [data-a="1"] { transition-delay: .05s; }
.slide.active [data-a="2"] { transition-delay: .16s; }
.slide.active [data-a="3"] { transition-delay: .27s; }
.slide.active [data-a="4"] { transition-delay: .38s; }
.slide.active [data-a="5"] { transition-delay: .49s; }
.slide.active [data-a="6"] { transition-delay: .60s; }
.slide.active [data-a="7"] { transition-delay: .71s; }
.slide.active [data-a="8"] { transition-delay: .82s; }

/* ---------- shared typographic system ---------- */
.kicker {
  font-family: var(--mono); font-size: 13px; font-weight: 700;
  letter-spacing: .3em; text-transform: uppercase; color: var(--orange);
  display: flex; align-items: center; gap: 14px; margin-bottom: 2.2vh;
}
.kicker::after { content: ''; height: 1px; width: 120px; background: linear-gradient(90deg, var(--orange), transparent); }

h1.display {
  font-weight: 900; font-size: clamp(38px, 5.6vw, 80px); line-height: 1.06;
  letter-spacing: -0.015em; text-wrap: balance;
}
h1.display .dim { color: var(--fog); font-weight: 300; }
h1.display .hot { color: var(--orange); }
h1.display.md { font-size: clamp(30px, 3.8vw, 54px); }

.sub {
  margin-top: 2.4vh; font-weight: 300; font-size: clamp(17px, 1.7vw, 24px);
  color: #c7d0dc; max-width: 82ch; line-height: 1.6;
}
.sub b, .sub strong { color: var(--paper); font-weight: 700; }
.sub .hot { color: var(--orange); }

.mono-tag {
  font-family: var(--mono); color: var(--fog); font-size: 13px;
  letter-spacing: .25em; text-transform: uppercase; margin-top: 3vh;
}

/* ---------- cover ---------- */
.cover .chips { display: flex; gap: 14px; margin-top: 4.5vh; flex-wrap: wrap; }
.chip {
  font-family: var(--mono); font-size: 14px; letter-spacing: .08em; color: #c7d0dc;
  border: 1px solid var(--line); border-radius: 999px; padding: 11px 20px; background: var(--panel);
}
.chip.hot { color: var(--orange); border-color: rgba(255,153,0,.45); }

/* ---------- chapter dividers ---------- */
.chapter { justify-content: center; }
.chapter .num {
  position: absolute; right: 4vw; bottom: -6vh; z-index: -1;
  font-weight: 900; font-size: 44vh; line-height: 1; letter-spacing: -.04em;
  color: transparent; -webkit-text-stroke: 2px rgba(255,153,0,.28); user-select: none;
}
.chapter h1.display { font-size: clamp(48px, 6.8vw, 100px); max-width: 16ch; }

/* ---------- tile grid ---------- */
.tiles { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-top: 3.2vh; }
.tiles.four { grid-template-columns: repeat(4, 1fr); }
.tiles.two { grid-template-columns: repeat(2, 1fr); }
.tile {
  background: var(--panel); border: 1px solid var(--line); border-radius: 14px;
  padding: 28px 22px 20px; position: relative; display: flex; flex-direction: column;
  transition: transform .35s var(--step), border-color .35s;
}
.tile:hover { transform: translateY(-4px); border-color: rgba(255,153,0,.5); }
.tile .tn {
  position: absolute; top: -11px; left: 16px; font-family: var(--mono); font-size: 12px;
  font-weight: 700; color: var(--orange); background: var(--ink);
  border: 1px solid rgba(255,153,0,.4); border-radius: 5px; padding: 2px 8px; letter-spacing: .1em;
}
.tile.tc-blue .tn { color: var(--blue); border-color: rgba(65,179,255,.4); }
.tile.tc-green .tn { color: var(--green); border-color: rgba(0,229,0,.4); }
.tile.tc-purple .tn { color: var(--purple); border-color: rgba(173,92,255,.4); }
.tile.tc-pink .tn { color: var(--pink); border-color: rgba(255,92,133,.4); }
.tile h3 { font-size: clamp(17px, 1.5vw, 21px); font-weight: 700; margin: 6px 0 8px; color: var(--paper); }
.tile p { font-size: clamp(14px, 1.25vw, 17px); font-weight: 300; color: #c7d0dc; line-height: 1.55; }
.tile p b { color: var(--paper); }
.tile .tt {
  display: inline-block; margin-top: auto; align-self: flex-start;
  font-family: var(--mono); font-size: 12px; color: var(--fog); letter-spacing: .08em;
  border: 1px solid var(--line); border-radius: 5px; padding: 4px 10px; margin-top: 14px;
}

/* ---------- ladder / rungs ---------- */
.ladder { margin-top: 2.8vh; display: flex; flex-direction: column; gap: 14px; }
.rung {
  display: grid; grid-template-columns: 60px 1fr auto; gap: 1.6vw; align-items: center;
  background: var(--panel); border: 1px solid var(--line); border-radius: 14px;
  padding: 2.4vh 1.6vw; position: relative; overflow: hidden;
}
.rung::before { content: ''; position: absolute; left: 0; top: 0; bottom: 0; width: 4px; background: var(--rc, var(--fog)); }
.rung .k { font-family: var(--mono); font-weight: 700; font-size: 19px; color: var(--rc, var(--fog)); }
.rung h3 { font-size: clamp(17px, 1.7vw, 22px); font-weight: 700; }
.rung h3 code { font-family: var(--mono); font-size: .85em; color: var(--rc, var(--paper)); }
.rung p { font-weight: 300; font-size: clamp(14.5px, 1.35vw, 18px); color: #c7d0dc; margin-top: 4px; line-height: 1.5; }
.rung p b { color: var(--paper); }
.rung .tag {
  font-family: var(--mono); font-size: 12px; letter-spacing: .1em; white-space: nowrap;
  color: var(--rc, var(--fog)); border: 1px solid var(--rc, var(--line)); border-radius: 6px; padding: 4px 10px;
}
.dial-axis {
  display: flex; justify-content: space-between; margin-top: 1.6vh;
  font-family: var(--mono); font-size: 12px; color: var(--fog); letter-spacing: .18em; text-transform: uppercase;
}

/* ---------- split layouts ---------- */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 2.4vw; margin-top: 3vh; align-items: stretch; }
.split.w64 { grid-template-columns: 1.6fr 1fr; }
.split.w46 { grid-template-columns: 1fr 1.6fr; }

.panel {
  background: var(--panel); border: 1px solid var(--line); border-radius: 14px; padding: 2.6vh 1.6vw;
}
.panel > h3 {
  font-family: var(--mono); font-size: 13px; font-weight: 700; letter-spacing: .2em;
  text-transform: uppercase; color: var(--pc, var(--orange)); margin-bottom: 1.6vh;
}
.panel ul { list-style: none; }
.panel li {
  font-weight: 300; font-size: clamp(14.5px, 1.35vw, 18px); color: #c7d0dc;
  line-height: 1.55; padding: .9vh 0 .9vh 22px; position: relative;
  border-bottom: 1px solid rgba(42,53,67,.6);
}
.panel li:last-child { border-bottom: none; }
.panel li::before { content: '▸'; position: absolute; left: 0; color: var(--pc, var(--orange)); }
.panel li b { color: var(--paper); font-weight: 700; }
.panel li code, .rung p code, .tile p code, .take p code, .compare td code {
  font-family: var(--mono); font-size: .85em; color: var(--blue);
  background: rgba(65,179,255,.08); border-radius: 4px; padding: 1px 6px;
}

/* ---------- code block ---------- */
.codeblock {
  margin-top: 2.6vh; background: #0d1420; border: 1px solid var(--line); border-radius: 14px;
  font-family: var(--mono); font-size: clamp(13px, 1.15vw, 16.5px); line-height: 1.75;
  padding: 2.8vh 2vw; overflow: hidden; position: relative; white-space: pre;
}
.codeblock::before {
  content: attr(data-file); position: absolute; top: 0; right: 0; font-size: 12px;
  color: var(--fog); background: var(--panel); border-bottom-left-radius: 10px;
  padding: 6px 14px; letter-spacing: .1em; font-family: var(--mono);
}
.codeblock .cm { color: #93a1b5; }
.codeblock .ck { color: var(--orange); }
.codeblock .cs { color: var(--green); }
.codeblock .cv { color: var(--blue); }
.split .codeblock { margin-top: 0; }

/* ---------- compare table ---------- */
.compare { width: 100%; border-collapse: collapse; margin-top: 2.8vh; }
.compare th {
  font-family: var(--mono); font-size: 13px; letter-spacing: .12em; text-transform: uppercase;
  color: var(--fog); text-align: left; padding: 1.4vh 1.2vw; border-bottom: 2px solid var(--line);
}
.compare th.hl { color: var(--orange); }
.compare td {
  font-weight: 300; font-size: clamp(14px, 1.3vw, 18px); color: #c7d0dc;
  padding: 1.5vh 1.2vw; border-bottom: 1px solid rgba(42,53,67,.6); line-height: 1.5; vertical-align: top;
}
.compare td:first-child { font-weight: 700; color: var(--paper); white-space: nowrap; }
.compare td b { color: var(--paper); }
.compare td.good { color: var(--green); }
.compare td.bad { color: var(--pink); }

/* ---------- takeaways ---------- */
.takeaways { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-top: 3.2vh; }
.take { border-top: 4px solid var(--orange); background: var(--panel); border-radius: 0 0 16px 16px; padding: 2.8vh 1.6vw; }
.take .tk { font-family: var(--mono); font-weight: 700; font-size: 42px; color: transparent; -webkit-text-stroke: 1.5px var(--orange); }
.take h3 { font-size: clamp(17px, 1.7vw, 23px); font-weight: 900; margin: 1.2vh 0 1vh; }
.take p { font-weight: 300; font-size: clamp(14px, 1.3vw, 18px); color: #c7d0dc; line-height: 1.55; }
.take p b { color: var(--paper); }

/* ---------- resources ---------- */
.rescols { display: grid; grid-template-columns: 1fr 1fr; gap: 3vw; margin-top: 2.6vh; }
.rescols h3 {
  font-family: var(--mono); font-size: 13px; letter-spacing: .22em; color: var(--orange);
  text-transform: uppercase; margin-bottom: 1.4vh;
}
.rl { display: flex; align-items: center; gap: 14px; padding: 1.3vh 0; border-bottom: 1px solid var(--line); }
.rl .mglyph { width: 28px; height: 28px; font-size: 12px; border: 1px solid var(--line); color: var(--fog); flex: none; }
.rl a { color: var(--paper); text-decoration: none; font-weight: 400; font-size: clamp(14px, 1.3vw, 17px); }
.rl a:hover { color: var(--orange-hot); }
.rl span.rtag { font-family: var(--mono); font-size: 12px; color: var(--fog); margin-left: auto; letter-spacing: .06em; white-space: nowrap; }

/* monogram glyph */
.mglyph {
  border-radius: 7px; display: flex; align-items: center; justify-content: center;
  font-family: var(--mono); font-weight: 700; font-size: 13px;
}

/* ---------- SVG diagrams ---------- */
.arch { position: relative; margin-top: 2vh; flex: 1; min-height: 0; }
.arch svg { width: 100%; height: 100%; max-height: 66vh; display: block; margin: 0 auto; }
.arch .an { font-family: var(--disp); font-weight: 700; fill: var(--paper); }
.arch .am { font-family: var(--mono); fill: var(--fog); }
.wire { stroke-dasharray: 7 7; animation: wireflow 1.2s linear infinite; fill: none; stroke-width: 2; }
@keyframes wireflow { to { stroke-dashoffset: -14; } }
.wire-static { fill: none; stroke-width: 2; }

/* ---------- overview agenda ---------- */
.agenda { display: flex; flex-direction: column; gap: 18px; margin-top: 3.4vh; }
.ag {
  display: grid; grid-template-columns: 90px 1fr auto; gap: 2vw; align-items: center;
  background: var(--panel); border: 1px solid var(--line); border-radius: 14px; padding: 3vh 2vw;
}
.ag .n { font-family: var(--mono); font-weight: 700; font-size: 34px; color: transparent; -webkit-text-stroke: 1.5px var(--orange); }
.ag h3 { font-size: clamp(20px, 2vw, 28px); font-weight: 900; }
.ag p { font-weight: 300; font-size: clamp(14.5px, 1.4vw, 19px); color: #c7d0dc; margin-top: 4px; }
.ag .tag {
  font-family: var(--mono); font-size: 12px; letter-spacing: .12em; color: var(--fog);
  border: 1px solid var(--line); border-radius: 6px; padding: 5px 12px; white-space: nowrap;
}

@media (max-width: 900px) {
  .tiles, .tiles.four, .takeaways { grid-template-columns: 1fr 1fr; }
  .split, .split.w64, .split.w46, .rescols { grid-template-columns: 1fr; }
}

/* ---- speaker notes (S: 스피커 뷰 팝업 · N: 오버레이) ---- */
.slide .notes { display: none; }  /* 발표자 노트 — 청중 화면에 렌더되지 않음 */
#notesbar {
  position: fixed; left: 50%; bottom: 9vh; transform: translateX(-50%);
  width: min(72vw, 980px); max-height: 26vh; overflow-y: auto; z-index: 55;
  background: rgba(11, 16, 23, .93); border: 1px solid var(--line);
  border-left: 3px solid var(--orange); border-radius: 10px;
  padding: 14px 20px; font-size: 15px; line-height: 1.65; color: var(--paper);
  backdrop-filter: blur(6px); box-shadow: 0 16px 44px rgba(0,0,0,.5);
}
#notesbar em { color: var(--fog); }
#notesbar b { color: var(--orange-hot); }
#notesbar code { font-family: var(--mono); font-size: .9em; color: var(--blue); }

/* ---- presenter · speakers · survey QR ---- */
.hud .keys { font-family: var(--mono); font-size: 11px; letter-spacing: .1em; color: var(--fog); opacity: .55; margin-left: 26px; }
.hud .keys b { color: var(--orange); font-weight: 700; }

.speakers { display: flex; gap: 46px; margin-top: 4.2vh; flex-wrap: wrap; }
.speakers[hidden] { display: none; }
.speakers .spk { border-left: 2px solid var(--line); padding-left: 18px; }
.speakers .spk h4 { font-family: var(--disp); font-size: 21px; font-weight: 800; color: var(--paper); margin: 0 0 6px; }
.speakers .spk p { margin: 2px 0; font-family: var(--mono); font-size: 12px; letter-spacing: .06em; }
.speakers .spk .t { color: var(--fog); text-transform: uppercase; }
.speakers .spk .c { color: var(--orange); font-weight: 700; }
.speakers .spk .l { color: var(--fog); opacity: .8; }

.qrbox { position: absolute; right: 3.8vw; bottom: 13vh; display: flex; flex-direction: column; align-items: center; gap: 10px; }
.qrbox[hidden] { display: none; }
.qrbox .qr { width: 128px; height: 128px; background: #fff; border-radius: 10px; padding: 8px; box-sizing: border-box; }
.qrbox .qr svg { width: 100%; height: 100%; display: block; }
.qrbox > span { font-family: var(--mono); font-size: 11px; letter-spacing: .18em; color: var(--fog); }

.setup {
  position: fixed; top: 50%; right: 28px; transform: translateY(-50%);
  width: 360px; max-height: 88vh; overflow-y: auto;
  background: var(--panel); border: 1px solid var(--line); border-radius: 16px;
  padding: 22px 24px; z-index: 60; box-shadow: 0 24px 64px rgba(0,0,0,.55);
}
.setup[hidden] { display: none; }
.setup header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 10px; }
.setup .st { font-family: var(--mono); font-size: 13px; letter-spacing: .22em; color: var(--orange); font-weight: 700; }
.setup header button { background: none; border: 0; color: var(--fog); font-size: 20px; cursor: pointer; line-height: 1; padding: 2px 6px; }
.setup header button:hover { color: var(--paper); }
.setup .note { font-size: 12.5px; color: var(--fog); line-height: 1.55; margin: 0 0 14px; }
.setup .seg { display: flex; border: 1px solid var(--line); border-radius: 10px; overflow: hidden; margin-bottom: 14px; }
.setup .seg button { flex: 1; padding: 8px 0; background: none; border: 0; color: var(--fog); font-family: var(--mono); font-size: 12px; cursor: pointer; }
.setup .seg button.on { background: var(--orange); color: var(--ink); font-weight: 700; }
.setup fieldset { border: 0; padding: 0; margin: 0 0 12px; }
.setup fieldset[hidden] { display: none; }
.setup legend { font-family: var(--mono); font-size: 12px; font-weight: 700; color: var(--paper); letter-spacing: .08em; margin-bottom: 6px; padding: 0; }
.setup label { display: block; font-size: 11.5px; color: var(--fog); margin-bottom: 8px; }
.setup input[type="text"], .setup input[type="url"] {
  display: block; width: 100%; margin-top: 4px; padding: 8px 10px; box-sizing: border-box;
  background: #0d141d; border: 1px solid var(--line); border-radius: 8px;
  color: var(--paper); font-family: var(--mono); font-size: 13px;
}
.setup input:focus { outline: none; border-color: var(--orange); }
.setup .chk { display: flex; align-items: center; gap: 8px; font-size: 12.5px; color: var(--paper); margin: 12px 0; }
.setup .chk input { accent-color: var(--orange); }
.setup .survey em { font-style: normal; color: var(--fog); opacity: .8; }
.setup .actions { display: flex; justify-content: space-between; gap: 10px; margin-top: 14px; }
.setup .actions button {
  padding: 9px 16px; border-radius: 9px; border: 1px solid var(--line);
  background: none; color: var(--fog); font-family: var(--mono); font-size: 12px; cursor: pointer;
}
.setup .actions button:hover { border-color: var(--fog); color: var(--paper); }
.setup .actions button.primary { background: var(--orange); border-color: var(--orange); color: var(--ink); font-weight: 700; }
.setup .actions button.primary:hover { background: var(--orange-hot); color: var(--ink); }

/* ---- PDF 버튼 (P 키와 동일 — window.print) ---- */
.pdfbtn {
  position: fixed; top: 14px; right: 22px; z-index: 43; cursor: pointer;
  font-family: var(--mono); font-size: 11px; font-weight: 700; letter-spacing: .14em;
  color: var(--fog); background: rgba(19,26,36,.8); border: 1px solid var(--line);
  border-radius: 8px; padding: 6px 12px; transition: border-color .25s, color .25s;
}
.pdfbtn:hover { border-color: var(--orange); color: var(--orange); }

/* ---- 언어 전환 버튼 (EN ↔ KO — deck.js가 현재 슬라이드 해시를 유지한 채 이동) ---- */
.langbtn {
  position: fixed; top: 14px; right: 84px; z-index: 43; cursor: pointer;
  font-family: var(--mono); font-size: 11px; font-weight: 700; letter-spacing: .14em;
  color: var(--fog); background: rgba(19,26,36,.8); border: 1px solid var(--line);
  border-radius: 8px; padding: 6px 12px; transition: border-color .25s, color .25s;
}
.langbtn:hover { border-color: var(--orange); color: var(--orange); }

/* ---- 인라인 편집 ([data-edit] — 클릭해서 수정, deck.js가 localStorage에 저장) ---- */
[data-edit] { cursor: text; border-radius: 4px; }
[data-edit]:hover { outline: 1px dashed rgba(255,153,0,.45); outline-offset: 3px; }
[data-edit]:focus { outline: 1px dashed rgba(255,153,0,.8); outline-offset: 3px; }

/* ---- print / PDF (P 키 또는 PDF 버튼 → 브라우저 인쇄 → PDF 저장) ---- */
@media print {
  * { -webkit-print-color-adjust: exact; print-color-adjust: exact; }
  @page { size: 13.333in 7.5in; margin: 0; }
  html, body { height: auto !important; overflow: visible !important; }
  .navbtns, .pdfbtn, .langbtn, .progress, .setup, #notesbar, #splash, .hud .keys { display: none !important; }
  /* 노이즈(blend-mode)·그리드(mask)는 페이지 전체 래스터화를 유발해 PDF가 수십 MB로 커진다 — 인쇄 제외 */
  .atmosphere::after, .gridlines { display: none !important; }
  .slide {
    position: relative !important; inset: auto !important; display: flex !important;
    visibility: visible !important; opacity: 1 !important; transform: none !important;
    width: 100vw; height: 100vh; overflow: hidden;
    background: linear-gradient(118deg, #0b0d20 0%, #10123a 55%, #150f3e 100%);
    page-break-after: always; break-after: page;
  }
  .slide [data-a] {
    opacity: 1 !important; transform: none !important; transition: none !important; animation: none !important;
  }
}