/* ============================================================
   ACADEMIC PRESENTATION DESIGN SYSTEM  ·  theme.css
   Bespoke 16:9 HTML slide framework — print-to-PDF via Chromium.
   Replicates the author's house style (white canvas, geometric-sans
   underlined headings, signature accent, type-only highlighting)
   and refines it (token-driven recolor, emphasis discipline,
   density caps, real captions).

   PER-DECK USAGE: override ONLY the --accent* tokens in an inline
   <style> block in the deck file. Everything else stays fixed.
   ============================================================ */

/* vendored fonts — fully offline, no CDN. Bricolage Grotesque (display) + Inter (body);
   mono falls back to the universal system monospace stack. */
@import url('vendor/fonts/fonts.css');

/* ---------- DESIGN TOKENS ---------- */
:root {
  /* Per-deck accent — OVERRIDE THESE ONLY. Default = signature purple. */
  --accent:        #6B30D8;   /* headers, kickers, page no., structural emphasis */
  --accent-ink:    #4A1E97;   /* darker accent for small text / links on white   */
  --accent-soft:   #EFE9FB;   /* callout / recall-box fill                        */
  --accent-line:   #D6C8F2;   /* hairline borders, underline rule, table head     */

  /* Fixed across every deck — near-monochrome ink on white, NO washed gray. */
  --ink:        #14241B;   /* slide titles + bold keywords (emphasis tier 1) — green-tinted near-black */
  --body:       #1F2A24;   /* body copy — de-blued */
  --muted:      #3C4A43;   /* captions, footnotes, footer — green-slate, not gray */
  --critical:   #C0392B;   /* tier-3: the ONE key claim / warning per slide  */
  --annot-2:    #1F6F8B;   /* second diagram-annotation colour ONLY (teal, CB-safe vs green) */
  --paper:      #FFFFFF;
  --panel:      #F2F6F3;   /* alternate panel / code background — green-tinted */
  --rule:       #D7E0DB;  /* faint green hairline */

  --font-display: 'Bricolage Grotesque', 'Segoe UI', system-ui, sans-serif;
  --font-body:    'Inter', 'Segoe UI', system-ui, sans-serif;
  --font-mono:    'JetBrains Mono', ui-monospace, 'Courier New', monospace;

  /* ---- TYPE SCALE — minor third (x1.2), 24px body floor. size+weight hierarchy only. ---- */
  --fs-title-hero:   72px;  /* .t-title (title slide)            — Bricolage 800 */
  --fs-thanks:       72px;  /* .slide--closing .thanks           — Bricolage 800 */
  --fs-sec:          52px;  /* .slide--section .sec-title        — Bricolage 800 */
  --fs-title:        42px;  /* .slide-title (content head/claim) — Bricolage 700 */
  --fs-stat:         48px;  /* .stat .num                       — Bricolage 800 */
  --fs-lead:         27px;  /* .lead-text / .t-occasion         — Inter 500 */
  --fs-body:         24px;  /* p, .bullets > li  (BODY FLOOR)   — Inter 400 */
  --fs-sub:          21px;  /* sub-bullets, .small, .t-instr    — Inter 400/500 */
  --fs-card:         20px;  /* .card-title, .recall p           — Inter/Bricolage 600 */
  --fs-table:        19px;  /* table.t, default acad            — Inter 400 */
  --fs-table-tight:  17px;  /* table.acad.tight                 — raised from 13.5px */
  --fs-cap:          17px;  /* .figcaption                      — Inter 600, raised from 15px */
  --fs-kicker:       15px;  /* .kicker, .runbar .ctx, foot      — Bricolage 600 */
  --fs-foot:         13px;  /* .slide-foot, .refnote, .acad-note floor */
  /* Weights, explicit (only loaded weights used) */
  --w-disp-hero: 800; --w-disp-strong: 700; --w-disp-med: 600;
  --w-body-bold: 700; --w-body-semi: 600;  --w-body-med: 500; --w-body-reg: 400;

  --slide-w: 1280px;
  --slide-h: 720px;
  --pad-x: 72px;   /* left/right safe margin */
  --pad-y: 52px;   /* top/bottom safe margin */
}

/* ---------- RESET ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html, body { background: #4a4a55; }
body { font-family: var(--font-body); color: var(--body); -webkit-print-color-adjust: exact; print-color-adjust: exact; }

/* ---------- DECK + SLIDE FRAME ---------- */
.deck { display: flex; flex-direction: column; align-items: center; gap: 28px; padding: 28px 0; }

.slide {
  position: relative;
  width: var(--slide-w);
  height: var(--slide-h);
  flex: 0 0 auto;
  background: var(--paper);
  color: var(--body);
  overflow: hidden;
  padding: var(--pad-y) var(--pad-x);
  display: flex;
  flex-direction: column;
  box-shadow: 0 8px 40px rgba(0,0,0,.35);
}

/* ---------- SLIDE HEADER ---------- */
.kicker {
  font-family: var(--font-display);
  font-weight: var(--w-disp-med);
  font-size: var(--fs-kicker);
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 8px;
}
.slide-title {
  font-family: var(--font-display);
  font-weight: var(--w-disp-strong);
  font-size: var(--fs-title);
  line-height: 1.12;
  color: var(--ink);
  padding-bottom: 0;
  margin-bottom: 22px;
}
/* header band — kicker + title, separated by ONE subtle full-width hairline.
   No stubby accent stub; refined, professional. */
.kicker + .slide-title { margin-bottom: 14px; }
.kicker + .slide-title {
  border-bottom: 1px solid rgba(20,20,20,.08);
  padding-bottom: 16px;
}
.slide-title .lead { color: var(--accent); }   /* coloured acronym/initial letters */

/* running wordmark bar variant (method slides) */
.runbar {
  display: flex; align-items: baseline; gap: 14px;
  border-bottom: 1px solid rgba(20,20,20,.08);
  padding-bottom: 12px; margin-bottom: 20px;
}
.runbar .mark { font-family: var(--font-display); font-weight: var(--w-disp-hero); color: var(--accent); font-size: 20px; letter-spacing: .02em; }
.runbar .ctx  { font-size: var(--fs-kicker); color: var(--muted); }

/* ---------- SLIDE BODY ---------- */
.slide-body { flex: 1 1 auto; min-height: 0; }
/* vcenter — balances slides whose content is shorter than the body,
   so whitespace splits evenly instead of pooling at the bottom */
.slide-body.vcenter { display: flex; flex-direction: column; justify-content: center; }

p { font-size: var(--fs-body); line-height: 1.5; color: var(--body); margin-bottom: 12px; }
.lead-text { font-size: var(--fs-lead); line-height: 1.45; }
.small { font-size: var(--fs-sub); }

ul, ol { list-style: none; }
.bullets > li {
  position: relative;
  font-size: var(--fs-body); line-height: 1.45;
  padding-left: 28px; margin-bottom: 14px;
  color: var(--body);
}
.bullets > li::before {
  content: ""; position: absolute; left: 4px; top: 11px;
  width: 9px; height: 9px; border-radius: 2px;
  background: var(--accent);
}
.bullets ul > li {            /* sub-bullets */
  position: relative; font-size: var(--fs-sub); line-height: 1.4;
  padding-left: 24px; margin: 8px 0 0 0; color: var(--muted);
}
.bullets ul > li::before {
  content: ""; position: absolute; left: 2px; top: 9px;
  width: 7px; height: 7px; border-radius: 50%;
  background: transparent; border: 2px solid var(--accent-line);
}

/* === EMPHASIS SYSTEM — type-only, 3 tiers + numeric. Use sparingly. ===
   Per-slide budget: <=3 .kw, <=2 .hl, 0-1 .hl-soft, 0-1 .crit. */
/* Tier 1 — key TERM. Weight + ink, no colour shift. Default emphasis. */
.kw       { font-weight: var(--w-body-bold); color: var(--ink); }
/* Tier 2 — structural / accented term. Accent-ink so it stays legible on white. */
.hl       { font-weight: var(--w-body-semi); color: var(--accent-ink); }
/* Soft chip — ONE per slide max, single load-bearing phrase. Green tint, not gray. */
.hl-soft  { background: var(--accent-soft); color: var(--accent-ink); font-weight: var(--w-body-semi);
            padding: .06em .26em; border-radius: 5px;
            -webkit-box-decoration-break: clone; box-decoration-break: clone; }
/* Tier 3 — the ONE critical claim/warning per slide. Never more than one phrase. */
.crit     { font-weight: var(--w-body-bold); color: var(--critical); }
/* NUMERIC highlight — foreground a metric in running prose, captions, table cells.
   Tabular-nums for alignment; accent-ink; display face for weight contrast vs Inter body.
   Use for pAUC / params / FLOPs / latency numbers inside sentences. */
.num-hl   { font-family: var(--font-display); font-weight: var(--w-disp-strong);
            color: var(--accent-ink); font-variant-numeric: tabular-nums; letter-spacing: .01em; }

/* ---------- LAYOUT HELPERS ---------- */
.cols { display: grid; gap: 32px; height: 100%; }
.cols-2 { grid-template-columns: 1fr 1fr; }
.cols-3 { grid-template-columns: 1fr 1fr 1fr; }
.cols-5-7 { grid-template-columns: 5fr 7fr; }
.cols-7-5 { grid-template-columns: 7fr 5fr; }
.col { min-width: 0; display: flex; flex-direction: column; }
.v-center { justify-content: center; }
.divider-v { border-left: 2px solid var(--rule); }

/* === IMAGE+TEXT SLIDE CONTRACT (shared, all decks inherit) ===
   Both columns share ONE vertical-centering rule so their midlines align.
   The grid row is full-height; every column centres its own content. */
.cols-7-5, .cols-5-7 { align-items: stretch; }
.cols-7-5 > .col,
.cols-5-7 > .col {
  display: flex; flex-direction: column; justify-content: center;  /* shared midline */
  min-height: 0;                                                    /* allow figure to fit */
}
/* FIGURE COLUMN — fills its box, vertically centred, NOT max-height-capped by literals. */
.col.figcol, .col.figfill, .col.fig-cap-row { justify-content: center; min-height: 0; }
.col.figcol .figure,
.col.figfill .figure,
.col.fig-cap-row .figure {
  flex: 1 1 auto; min-height: 0;
  display: flex; align-items: center; justify-content: center; width: 100%;
}
.col.figcol .figure img, .col.figcol .figure svg,
.col.figfill .figure img, .col.figfill .figure svg,
.col.fig-cap-row .figure img, .col.fig-cap-row .figure svg {
  max-width: 100%; max-height: 100%; width: auto; height: auto; object-fit: contain;
}
.col.figcol .figcaption,
.col.figfill .figcaption,
.col.fig-cap-row .figcaption { flex: 0 0 auto; margin-top: 10px; }   /* caption never steals figure space */
/* two stacked figures in one column: split height evenly, each half centred */
.col.figcol.two-up { gap: 18px; }
.col.figcol.two-up .figure { flex: 1 1 50%; }
.col.figcol.two-up .fig-mini-label { flex: 0 0 auto; }

/* ---------- CARDS / CALLOUTS ---------- */
.card {
  background: var(--panel);
  border: 1px solid var(--rule);
  border-radius: 12px;
  padding: 20px 22px;
}
.card .card-title { font-family: var(--font-display); font-weight: var(--w-disp-med); font-size: var(--fs-card); color: var(--ink); margin-bottom: 8px; }

/* "Remember (Abstract Sentence N)" recall box — token-driven so recolor is total */
.recall {
  background: var(--accent-soft);
  border: 1.5px solid var(--accent-line);
  border-left: 5px solid var(--accent);
  border-radius: 10px;
  padding: 14px 18px;
}
.recall .recall-tag {
  font-family: var(--font-display); font-weight: 700; font-size: 13px;
  letter-spacing: .08em; text-transform: uppercase; color: var(--accent);
  display: block; margin-bottom: 4px;
}
.recall p { font-size: var(--fs-card); margin: 0; color: var(--body); }

.callout {
  border-left: 5px solid var(--accent);
  background: var(--accent-soft);
  border-radius: 0 10px 10px 0;
  padding: 16px 20px;
}
.callout.is-critical { border-left-color: var(--critical); background: #FBEAE7; }

/* JUSTIFY long-form prose blocks; single-line items are a no-op. Hyphenate to avoid rivers.
   Bullets and table cells stay left-aligned (set elsewhere). */
.callout, .recall p, .card p {
  text-align: justify; hyphens: auto; -webkit-hyphens: auto; text-justify: inter-word;
}

/* stat / number highlight */
.stat-row { display: flex; gap: 28px; }
.stat { flex: 1; }
.stat .num { font-family: var(--font-display); font-weight: var(--w-disp-hero); font-size: var(--fs-stat); color: var(--accent); line-height: 1; font-variant-numeric: tabular-nums; }
.stat .lbl { font-size: var(--fs-kicker); color: var(--muted); margin-top: 6px; }

/* ---------- FIGURES ---------- */
.figure { display: flex; flex-direction: column; align-items: center; gap: 8px; }
.figure img, .figure video { max-width: 100%; max-height: 100%; object-fit: contain; border-radius: 6px; }
.figure.framed img { border: 1px solid var(--rule); background: #fff; padding: 8px; }
.figcaption {
  font-size: var(--fs-cap); color: var(--accent-ink); font-weight: var(--w-body-semi);
  line-height: 1.35;
  text-align: justify; text-align-last: center;   /* flush block, centred final line */
  hyphens: auto; -webkit-hyphens: auto;
}
.figcaption .src { color: var(--muted); font-weight: var(--w-body-reg); }
.fig-mini-label {       /* short coloured phrase above a figure */
  font-family: var(--font-display); font-weight: var(--w-disp-med); font-size: 16px;
  color: var(--accent); margin-bottom: 6px;
}

/* diagram annotation overlays — only --critical and --annot-2 allowed */
.annot { position: absolute; border: 2.5px dashed var(--critical); border-radius: 8px; }
.annot.alt { border-color: var(--annot-2); }
.annot-note { font-size: 15px; font-weight: var(--w-body-semi); color: var(--critical);
  text-align: justify; hyphens: auto; -webkit-hyphens: auto; }
.annot-note.alt { color: var(--annot-2); }

/* ---------- TABLES ---------- */
table.t { border-collapse: collapse; width: 100%; font-size: var(--fs-table); }
table.t th {
  background: var(--accent); color: #fff;
  font-family: var(--font-display); font-weight: var(--w-disp-med);
  text-align: left; padding: 9px 12px;
}
table.t td { padding: 8px 12px; border-bottom: 1px solid var(--rule); text-align: left; }
table.t tr:nth-child(even) td { background: var(--panel); }

/* ---------- EQUATIONS ---------- */
.eq { margin: 14px 0; text-align: center; }
.eq.boxed {
  background: var(--panel); border: 1px solid var(--rule);
  border-radius: 10px; padding: 16px 20px;
}
.katex { font-size: 1.04em; }

/* compact variant — for dense slides, so vcentred content clears title + footer */
.slide.is-tight .eq.boxed { padding: 10px 20px; margin: 4px 0 10px; }
.slide.is-tight .bullets > li { font-size: 22px; margin-bottom: 9px; }
.slide.is-tight .recall { padding: 10px 16px; }
.slide.is-tight .recall p { font-size: 17px; line-height: 1.4; }
.slide.is-tight .figure svg { max-height: 215px; }

/* ---------- CODE / ALGORITHM ---------- */
pre.algo {
  font-family: var(--font-mono); font-size: 15px; line-height: 1.5;
  background: var(--panel); border: 1px solid var(--rule);
  border-radius: 10px; padding: 16px 20px; color: var(--ink);
  white-space: pre-wrap;
}

/* ---------- FOOTER ---------- */
.slide-foot {
  position: absolute; left: var(--pad-x); right: var(--pad-x); bottom: 22px;
  display: flex; justify-content: space-between; align-items: center;
  font-size: var(--fs-foot); color: var(--body);
}
.slide-foot .pg { font-family: var(--font-display); font-weight: var(--w-disp-med); color: var(--accent); font-size: 18px; margin-right: -24px; }
.refnote { font-size: var(--fs-foot); color: var(--body); }
.refnote b { color: var(--ink); font-weight: var(--w-body-semi); }

/* ============================================================
   SPECIAL SLIDE TYPES
   ============================================================ */

/* --- TITLE SLIDE (centered, large, academic) --- */
.slide--title { padding: 0; }
.slide--title .title-inner {
  position: relative; height: 100%;
  padding: 64px var(--pad-x);
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  text-align: center;
}
.t-brand { display: flex; flex-direction: column; align-items: center; gap: 12px; }
.t-brand .mark { display: flex; }
.t-brand .pk {
  font-family: var(--font-display); font-weight: 700; font-size: 24px;
  letter-spacing: .04em; color: var(--accent);
}
.t-title {
  font-family: var(--font-display); font-weight: var(--w-disp-hero);
  font-size: var(--fs-title-hero); line-height: 1.06; letter-spacing: -.02em;
  color: var(--ink); margin: 28px 0 0;
}
.t-title .lead { color: var(--accent); }
.t-occasion {
  font-family: var(--font-display); font-weight: var(--w-disp-med); font-size: var(--fs-lead);
  color: var(--muted); margin-top: 24px; letter-spacing: .01em;
}
.t-meta { margin-top: 30px; display: flex; flex-direction: column; gap: 14px; }
.t-row { font-size: 24px; color: var(--body); line-height: 1.3; }
.t-row .lbl {
  font-family: var(--font-display); font-weight: 700; color: var(--muted);
  letter-spacing: .12em; text-transform: uppercase; font-size: 15px; margin-right: 12px;
}
.t-row strong { color: var(--accent-ink); font-weight: 800; }
.t-rule { width: 420px; height: 2px; background: var(--accent); opacity: .85; margin: 34px 0 0; }
.t-affil { margin-top: 18px; font-size: 19px; color: var(--muted); line-height: 1.45; }
.slide--title .slide-foot { position: absolute; left: var(--pad-x); right: var(--pad-x); bottom: 30px; }
.slide--title .slide-foot .pg { color: var(--accent); }

/* --- SECTION DIVIDER --- */
.slide--section { background: var(--ink); color: #fff; justify-content: center; }
.slide--section .sec-no {
  font-family: var(--font-display); font-weight: 800; font-size: 22px;
  color: var(--accent); letter-spacing: .1em;
}
.slide--section .sec-title {
  font-family: var(--font-display); font-weight: var(--w-disp-hero); font-size: var(--fs-sec);
  line-height: 1.1; margin-top: 10px;
}
.slide--section .sec-title::after {
  content:""; display:block; width:120px; height:5px; border-radius:3px;
  background: var(--accent); margin-top: 22px;
}
.slide--section .sec-pre { color: #C9D6CF; font-size: var(--fs-table); margin-top: 20px; max-width: 60%;
  text-align: justify; hyphens: auto; -webkit-hyphens: auto; }

/* --- TABLE OF CONTENTS --- */
.toc { display: flex; flex-direction: column; gap: 14px; }
.toc-item { display: flex; align-items: baseline; gap: 18px; }
.toc-item .n {
  font-family: var(--font-display); font-weight: 800; font-size: 26px;
  color: var(--accent); width: 44px;
}
.toc-item .t { font-family: var(--font-display); font-weight: 600; font-size: 26px; color: var(--ink); }
.toc-item .d { font-size: 19px; color: var(--muted); }

/* --- CLOSING --- */
.slide--closing { justify-content: center; align-items: flex-start; }
.slide--closing .close-mark { display:flex; align-items:center; gap:14px; margin-bottom: 26px; }
.slide--closing .close-mark .pk {
  font-family: var(--font-display); font-weight: 700; font-size: 20px;
  letter-spacing: .04em; color: var(--accent);
}
.slide--closing .thanks {
  font-family: var(--font-display); font-weight: var(--w-disp-hero); font-size: var(--fs-thanks);
  line-height: 1.02; color: var(--ink); letter-spacing: -.01em;
}
.slide--closing .close-sub { margin-top: 22px; font-size: var(--fs-lead); color: var(--body); }
.slide--closing .close-sub a { color: var(--accent-ink); font-weight: var(--w-body-semi); text-decoration: none; }
.slide--closing .close-q {
  margin-top: 14px; font-family: var(--font-display); font-weight: var(--w-disp-med);
  font-size: var(--fs-lead); color: var(--accent);
}

/* progress dots counter, e.g. Results (3/8) */
.counter { font-family: var(--font-display); font-weight: 600; font-size: 15px; color: var(--muted); }
.counter b { color: var(--accent); }

/* ============================================================
   SCREEN vs PRINT
   ============================================================ */
@media screen {
  /* fit-to-width review without zooming the browser */
  body.fit .deck { gap: 0; padding: 0; }
}

@media print {
  html, body { background: #fff; }
  .deck { gap: 0; padding: 0; }
  .slide {
    box-shadow: none;
    page-break-after: always;
    break-after: page;
  }
  .slide:last-child { page-break-after: auto; }
}
@page { size: 1280px 720px; margin: 0; }

/* ============================================================
   PRESENTATION RUNTIME (v3) — review + present modes, responsive.
   Driven by deck.js. Print/PDF is fully neutralised below.
   ============================================================ */
@keyframes deckRise {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: none; }
}

/* on-screen furniture */
.deck-progress {
  display: none; position: fixed; left: 0; bottom: 0; height: 3px; width: 0;
  background: var(--accent); z-index: 60; transition: width .4s ease;
}
.deck-hint {
  position: fixed; right: 18px; bottom: 16px; z-index: 60; cursor: pointer;
  font-family: var(--font-body); font-size: 13px; font-weight: 500; color: #fff;
  background: rgba(18,18,26,.86); padding: 8px 14px; border-radius: 8px;
  letter-spacing: .03em; transition: opacity .5s ease;
}

/* ---- PRESENT MODE: one slide, scaled to fit any screen ---- */
body.present { overflow: hidden; background: #0b0b10; }
body.present .deck { display: block; gap: 0; padding: 0; }
body.present .slide {
  position: fixed; top: 50%; left: 50%; margin: 0;
  transform: translate(-50%, -50%) scale(var(--scale, 1));
  opacity: 0; pointer-events: none; transition: opacity .4s ease;
}
body.present .slide.active { opacity: 1; pointer-events: auto; }
body.present .deck-progress { display: block; }
body.present.blanked .slide.active { opacity: 0; }

/* within-slide build: deck.js tags content as .frag and reveals it
   one step per advance. Fragments have NO transition by default, so
   arriving at a slide snaps its content to the built state with no
   flash; only the freshly revealed fragment gets .anim and animates. */
body.present .slide .frag { opacity: 0; transform: translateY(20px); }
body.present .slide .frag.shown { opacity: 1; transform: none; }
body.present .slide .frag.anim {
  transition: opacity .45s ease, transform .45s cubic-bezier(.2,.7,.2,1);
}
/* while switching into/out of present mode, kill all transitions so the
   mode change snaps cleanly — no burst of the review layout fading out */
body.no-anim .slide,
body.no-anim .slide .frag,
body.no-anim .slide .frag.anim { transition: none !important; }
@media (prefers-reduced-motion: reduce) {
  body.present .slide, body.present .slide .frag {
    animation: none !important; transition: none !important;
  }
}

/* ---- print: neutralise the runtime so the PDF stays static ---- */
@media print {
  .deck-progress, .deck-hint { display: none !important; }
  .deck { zoom: 1 !important; }
  body.present { overflow: visible; background: #fff; }
  body.present .deck { display: flex; }
  body.present .slide {
    position: relative; top: auto; left: auto;
    transform: none !important; opacity: 1 !important;
  }
  body.present .slide .frag { opacity: 1 !important; transform: none !important; }
}