/* Slide deck: a fixed 1600×900 stage scaled to fit the screen. */
html, body { height: 100%; }
body.deck { overflow: hidden; background: var(--paper-3); }
.viewport { position: fixed; inset: 0 0 36px 0; overflow: hidden; }
.stage { position: absolute; left: 50%; top: 50%; width: 1600px; height: 900px; transform-origin: center center; background: var(--paper); overflow: hidden; font-size: 30px; line-height: 1.35; box-shadow: 0 20px 60px -30px rgba(0, 0, 0, 0.5); }
.stage::before { content: ""; position: absolute; inset: 0; pointer-events: none; background: repeating-linear-gradient(0deg, transparent 0 58px, color-mix(in srgb, var(--line) 35%, transparent) 58px 59px); opacity: 0.3; }
.slide { position: absolute; inset: 0; display: flex; flex-direction: column; padding: 56px 72px 70px; }
.slide > * { position: relative; }
.slide-kicker { font-family: var(--font-display); font-weight: 800; font-size: 22px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--barn); }
.slide-title { font-size: 64px; margin: 0 0 22px; }
.slide-body { flex: 1; min-height: 0; display: flex; flex-direction: column; }
.slide .lead { font-size: 36px; color: var(--ink-2); max-width: 1250px; }
.slide .huge { font-family: var(--font-display); font-weight: 800; font-size: 100px; line-height: 1.02; letter-spacing: -0.02em; }
.slide ul.points { font-size: 34px; margin: 0; padding-left: 1.1em; }
.slide ul.points li + li { margin-top: 12px; }
.slide .card { padding: 24px 28px; }
.slide .btn { font-size: 26px; min-height: 64px; }
.slide .chip { font-size: 22px; }
.cols { display: grid; gap: 40px; grid-template-columns: 1fr 1fr; align-items: start; flex: 1; min-height: 0; }
.cols.c-60 { grid-template-columns: 3fr 2fr; }
.center { text-align: center; }

/* bridge (yesterday → today) */
.bridge { display: flex; align-items: center; justify-content: space-between; gap: 16px; margin-top: 30px; }
.bridge .bstep { display: grid; justify-items: center; gap: 6px; text-align: center; flex: 1; padding: 22px 10px; border-radius: var(--radius-lg); background: var(--card); border: 2px solid var(--line); }
.bridge .bstep .e { font-size: 84px; line-height: 1; }
.bridge .bstep b { font-size: 30px; }
.bridge .bstep .small { font-size: 22px; }
.bridge .bstep.today { background: var(--field-2); border-color: var(--field); }
.bridge .arr { font-size: 48px; color: var(--ink-3); }

/* ladder */
.ladder-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; margin-top: 10px; }
.ladder-grid .rung { display: flex; gap: 14px; align-items: flex-start; background: var(--card); border: 2px solid var(--line); border-left: 10px solid var(--c); border-radius: var(--radius-lg); padding: 18px 20px; min-height: 180px; }
.ladder-grid .rung .ln { display: grid; place-items: center; flex: none; width: 54px; height: 54px; border-radius: 50%; background: var(--c); color: #fff; font: 800 28px var(--font-display); }
.ladder-grid .rung b { font-size: 30px; display: block; }
.ladder-grid .rung .small { font-size: 22px; color: var(--ink-2); }

/* principles */
.princ { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.princ .p { background: var(--card); border: 2px solid var(--line); border-radius: var(--radius-lg); padding: 18px 22px; }
.princ .p .e { font-size: 44px; }
.princ .p b { font-size: 30px; display: block; margin: 6px 0; }
.princ .p .small { font-size: 22px; color: var(--ink-2); }

/* topic slide */
.topic-slide .demos { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; margin-top: 18px; }
.topic-slide .demo { background: var(--card); border: 2px solid var(--line); border-radius: var(--radius-lg); padding: 18px 20px; text-decoration: none; color: var(--ink); display: grid; gap: 6px; align-content: start; min-height: 230px; }
.topic-slide .demo:hover { border-color: var(--field); }
.topic-slide .demo .rg { font-size: 20px; color: var(--barn); font-weight: 800; letter-spacing: 0.06em; text-transform: uppercase; }
.topic-slide .demo b { font-size: 30px; }
.topic-slide .demo .small { font-size: 22px; color: var(--ink-2); }
.topic-slide .big-idea { font-size: 34px; background: var(--harvest-2); border-left: 10px solid var(--harvest); padding: 14px 22px; border-radius: 0 var(--radius) var(--radius) 0; margin: 0; }
.topic-slide .emoji { font-size: 110px; line-height: 1; }

/* steps */
.steps4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.steps4 .s { background: var(--card); border: 2px solid var(--line); border-radius: var(--radius-lg); padding: 22px; }
.steps4 .s .n { display: grid; place-items: center; width: 56px; height: 56px; border-radius: 50%; background: var(--field); color: #fff; font: 800 30px var(--font-display); margin-bottom: 10px; }
.steps4 .s b { font-size: 30px; display: block; }
.steps4 .s .small { font-size: 22px; color: var(--ink-2); }

/* footer and overlays */
.deck-foot { position: fixed; left: 0; right: 0; bottom: 0; height: 36px; display: flex; align-items: center; gap: 18px; padding: 0 20px; font-size: 15px; color: var(--ink-3); background: var(--paper-3); }
.deck-foot .sp { flex: 1; }
.overlay { position: fixed; inset: 0; z-index: 20; display: grid; place-items: center; background: color-mix(in srgb, var(--ink) 70%, transparent); padding: 4vh 4vw; }
.overlay .panel { background: var(--card); color: var(--ink); border-radius: var(--radius-lg); padding: 2rem 2.4rem; max-width: 1100px; width: 100%; max-height: 90vh; overflow: auto; font-size: clamp(16px, 1.6vw, 24px); box-shadow: var(--shadow); }
.overlay .panel h2 { margin-top: 0; }
.overlay .qr { text-align: center; }
.overlay .qr img { width: min(60vh, 520px); height: auto; background: #fff; padding: 14px; border-radius: 18px; }
.overlay .qr .url { font-family: var(--font-display); font-size: clamp(28px, 4vw, 64px); font-weight: 800; margin-top: 12px; }
.overview { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.overview button { text-align: left; font: inherit; padding: 12px 14px; border-radius: 12px; border: 2px solid var(--line); background: var(--paper); color: var(--ink); cursor: pointer; }
.overview button.on { border-color: var(--field); background: var(--field-2); }
.notes-md p, .notes-md li { font-size: inherit; }