/* =========================================================
   GPIE Keynote 2026 — Design System
   A founder's note on the AI era.
   ========================================================= */

:root {
  /* Core palette */
  --ink:        #07070c;   /* deep base */
  --ink-2:      #0c0d15;
  --ink-3:      #11131d;
  --paper:      #f4f3ee;   /* off-white text */
  --paper-dim:  #b7b8c4;
  --paper-mute: #6f7180;
  --line:       rgba(255,255,255,0.10);
  --line-soft:  rgba(255,255,255,0.06);

  /* Accents */
  --cyan:    #4fe3d0;
  --blue:    #5b8cff;
  --violet:  #9a6bff;
  --amber:   #f2b34a;
  --rose:    #ff6a8b;
  --green:   #6ee79b;

  /* Chapter accent (overridden per chapter) */
  --accent:  var(--cyan);
  --accent-2: var(--blue);

  --glow: 0 0 60px -12px var(--accent);

  --maxw: 1180px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);

  --serif: "Shippori Mincho", "Noto Serif JP", serif;
  --jp:    "Noto Sans JP", system-ui, sans-serif;
  --en:    "Space Grotesk", "Inter", system-ui, sans-serif;
  --mono:  "Space Mono", "Space Grotesk", monospace;
}

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

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--jp);
  background: var(--ink);
  color: var(--paper);
  line-height: 1.85;
  overflow-x: hidden;
  font-feature-settings: "palt" 1;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
}

/* Grain + vignette ambience */
body::before {
  content: "";
  position: fixed; inset: 0;
  pointer-events: none; z-index: 1;
  background:
    radial-gradient(120% 80% at 50% -10%, rgba(91,140,255,0.06), transparent 60%),
    radial-gradient(100% 60% at 100% 110%, rgba(154,107,255,0.05), transparent 60%);
  mix-blend-mode: screen;
}
body::after {
  content: "";
  position: fixed; inset: 0;
  pointer-events: none; z-index: 2;
  opacity: 0.035;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

::selection { background: var(--accent); color: var(--ink); }

a { color: inherit; text-decoration: none; }

/* =========================================================
   Layout primitives
   ========================================================= */
.wrap { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 28px; }

.deck { position: relative; z-index: 3; }

.slide {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 120px 0 110px;
  border-bottom: 1px solid var(--line-soft);
  overflow: hidden;
}
.slide-inner { width: 100%; }

/* chapter color themes */
.slide[data-accent="arrival"]  { --accent: var(--cyan);   --accent-2: var(--blue); }
.slide[data-accent="threat"]   { --accent: var(--rose);   --accent-2: var(--amber); }
.slide[data-accent="future"]   { --accent: var(--violet); --accent-2: var(--blue); }
.slide[data-accent="cover"]    { --accent: var(--cyan);   --accent-2: var(--violet); }
.slide[data-accent="end"]      { --accent: var(--cyan);   --accent-2: var(--green); }

/* =========================================================
   Slide meta header / footer
   ========================================================= */
.meta-top {
  display: flex; justify-content: space-between; align-items: baseline;
  gap: 16px; margin-bottom: 46px;
  font-family: var(--en);
  font-size: 0.72rem; letter-spacing: 0.22em; text-transform: uppercase;
  color: var(--paper-mute);
}
.meta-top .chapter { color: var(--paper-dim); }
.meta-top .pageno { color: var(--accent); font-weight: 600; }

.sect-num {
  display: inline-flex; align-items: center; gap: 12px;
  font-family: var(--mono); font-size: 0.78rem; letter-spacing: 0.18em;
  color: var(--accent); margin-bottom: 22px;
}
.sect-num::before {
  content: ""; width: 34px; height: 1px; background: var(--accent);
  display: inline-block; opacity: 0.7;
}

.meta-foot {
  position: absolute; left: 0; right: 0; bottom: 30px;
  display: flex; justify-content: space-between; align-items: center;
  font-family: var(--en); font-size: 0.68rem; letter-spacing: 0.2em;
  text-transform: uppercase; color: var(--paper-mute);
}
.meta-foot .gpie { color: var(--accent); font-weight: 600; letter-spacing: 0.3em; }

/* =========================================================
   Typography
   ========================================================= */
.eyebrow {
  font-family: var(--en); font-size: 0.74rem; letter-spacing: 0.34em;
  text-transform: uppercase; color: var(--accent); margin-bottom: 18px;
}
.kicker-en {
  font-family: var(--en); font-size: 0.95rem; letter-spacing: 0.16em;
  color: var(--paper-dim); margin-bottom: 14px; font-weight: 500;
}

.headline {
  font-family: var(--serif);
  font-weight: 700;
  line-height: 1.28;
  font-size: clamp(2.1rem, 6vw, 4.4rem);
  letter-spacing: 0.01em;
  text-wrap: balance;
}
.headline.lg { font-size: clamp(2.6rem, 8vw, 6rem); line-height: 1.1; }

.headline .hl {
  color: var(--accent);
  text-shadow: 0 0 40px color-mix(in srgb, var(--accent) 55%, transparent);
}

.lede {
  font-size: clamp(1rem, 1.5vw, 1.18rem);
  color: var(--paper-dim);
  max-width: 60ch;
  line-height: 2.1;
}
.body { color: var(--paper-dim); font-size: 1rem; line-height: 2.1; }
.body.sm { font-size: 0.92rem; line-height: 1.95; }
.body strong, .lede strong { color: var(--paper); font-weight: 600; }

.subcopy-en {
  font-family: var(--en); font-style: italic; color: var(--paper-mute);
  font-size: 0.98rem; letter-spacing: 0.02em;
}

.note {
  border-left: 2px solid var(--accent);
  padding: 8px 0 8px 22px;
  color: var(--paper-dim);
  font-size: 0.98rem; line-height: 2.05;
}

/* =========================================================
   Cards / grids
   ========================================================= */
.grid { display: grid; gap: 22px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }

.card {
  position: relative;
  background: linear-gradient(160deg, rgba(255,255,255,0.045), rgba(255,255,255,0.012));
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 28px 26px;
  transition: transform .5s var(--ease), border-color .4s, box-shadow .5s;
  overflow: hidden;
}
.card::before {
  content: ""; position: absolute; left: 0; top: 0; height: 3px; width: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  opacity: 0; transition: opacity .4s;
}
.card:hover {
  transform: translateY(-6px);
  border-color: color-mix(in srgb, var(--accent) 45%, transparent);
  box-shadow: 0 24px 60px -30px color-mix(in srgb, var(--accent) 70%, transparent);
}
.card:hover::before { opacity: 1; }

.card .tag {
  font-family: var(--mono); font-size: 0.7rem; letter-spacing: 0.2em;
  color: var(--accent); text-transform: uppercase; margin-bottom: 14px;
  display: block;
}
.card h3 {
  font-family: var(--serif); font-size: 1.4rem; font-weight: 700;
  margin-bottom: 4px; line-height: 1.4;
}
.card .h-en {
  font-family: var(--en); font-size: 0.82rem; letter-spacing: 0.14em;
  color: var(--paper-mute); margin-bottom: 16px; text-transform: uppercase;
}
.card p { color: var(--paper-dim); font-size: 0.92rem; line-height: 1.95; }

.chips { margin-top: 16px; display: flex; flex-wrap: wrap; gap: 7px; }
.chip {
  font-family: var(--mono); font-size: 0.66rem; letter-spacing: 0.04em;
  color: var(--paper-mute);
  border: 1px solid var(--line); border-radius: 999px;
  padding: 4px 10px; transition: color .3s, border-color .3s;
}
.card:hover .chip { color: var(--paper-dim); border-color: color-mix(in srgb, var(--accent) 30%, transparent); }

/* big index number */
.idx {
  font-family: var(--en); font-weight: 700;
  font-size: 2.4rem; line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1px color-mix(in srgb, var(--accent) 70%, transparent);
  margin-bottom: 14px; display: block;
}

/* =========================================================
   Cover (slide 01)
   ========================================================= */
#cover { text-align: left; }
.cover-grid {
  display: grid; grid-template-columns: 1.2fr 0.8fr; gap: 48px; align-items: center;
}
.cover-no {
  font-family: var(--mono); letter-spacing: 0.22em; color: var(--accent);
  font-size: 0.85rem; margin-bottom: 28px;
}
.cover-visual { position: relative; height: 420px; }

/* =========================================================
   Snowball (slide 03) — flow
   ========================================================= */
.flow { display: grid; grid-template-columns: 1fr 1fr 1.1fr; gap: 18px; align-items: stretch; }
.flow .var .vlabel {
  font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.16em;
  color: var(--accent); text-transform: uppercase; margin-bottom: 10px;
}
.flow .result {
  background: linear-gradient(160deg, color-mix(in srgb, var(--accent) 14%, transparent), rgba(255,255,255,0.01));
  border-color: color-mix(in srgb, var(--accent) 35%, transparent);
}
.op {
  display: flex; align-items: center; justify-content: center;
  font-family: var(--en); font-size: 1.4rem; color: var(--accent); font-weight: 700;
}
.growth-svg { width: 100%; height: 64px; margin-top: 16px; display: block; }
.grow-line { stroke-dasharray: 360; stroke-dashoffset: 360; }
.card.in-view .grow-line { animation: drawLine 1.8s var(--ease) forwards; }
@keyframes drawLine { to { stroke-dashoffset: 0; } }

/* =========================================================
   Threats vectors (slide 05)
   ========================================================= */
.vec { display: flex; gap: 18px; align-items: flex-start; }
.vec .num {
  font-family: var(--en); font-weight: 700; font-size: 1.3rem;
  color: var(--accent); min-width: 42px;
}

/* phases (slide 06) */
.phases { display: grid; grid-template-columns: 1fr auto 1fr auto 1fr; gap: 12px; align-items: center; }
.phase {
  border: 1px solid var(--line); border-radius: 14px; padding: 26px 22px; text-align: center;
  background: rgba(255,255,255,0.02);
}
.phase.outcome { border-color: color-mix(in srgb, var(--rose) 45%, transparent); background: color-mix(in srgb, var(--rose) 10%, transparent); }
.phase .pn { font-family: var(--mono); font-size: 0.68rem; letter-spacing: 0.18em; color: var(--accent); margin-bottom: 12px; }
.phase h4 { font-family: var(--serif); font-size: 1.3rem; margin-bottom: 8px; }
.phase p { font-size: 0.85rem; color: var(--paper-mute); }
.arrow { font-family: var(--en); font-size: 1.5rem; color: var(--accent); }

/* =========================================================
   Jobs table (slide 07)
   ========================================================= */
.jobs { width: 100%; border-collapse: collapse; font-size: 0.95rem; }
.jobs thead th {
  font-family: var(--en); font-size: 0.72rem; letter-spacing: 0.18em; text-transform: uppercase;
  color: var(--paper-mute); text-align: left; padding: 14px 18px; border-bottom: 1px solid var(--line);
}
.jobs td { padding: 18px; border-bottom: 1px solid var(--line-soft); vertical-align: middle; }
.jobs .dom { font-family: var(--serif); font-size: 1.1rem; }
.jobs .dom small { display: block; font-family: var(--en); font-size: 0.72rem; color: var(--paper-mute); letter-spacing: 0.1em; margin-top: 3px; }
.jobs .rate { font-family: var(--en); font-weight: 700; font-size: 1.5rem; color: var(--rose); }
.jobs .out { color: var(--paper-dim); font-size: 0.9rem; }
.jobs tr { transition: background .3s; }
.jobs tbody tr:hover { background: rgba(255,255,255,0.025); }

.bar { height: 5px; border-radius: 4px; background: rgba(255,255,255,0.08); overflow: hidden; margin-top: 8px; }
.bar > i { display: block; height: 100%; width: 0; background: linear-gradient(90deg, var(--amber), var(--rose)); border-radius: 4px; transition: width 1.4s var(--ease); }

/* =========================================================
   Two column (slides 08,09,12)
   ========================================================= */
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 54px; }
.col-head {
  font-family: var(--en); font-size: 0.8rem; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--accent); margin-bottom: 18px; padding-bottom: 12px; border-bottom: 1px solid var(--line);
}

/* =========================================================
   Balance diagram (slide 10)
   ========================================================= */
.balance { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 18px; }
.pillar { border: 1px solid var(--line); border-radius: 16px; padding: 26px; background: rgba(255,255,255,0.02); }
.pillar.bridge { border-color: color-mix(in srgb, var(--cyan) 40%, transparent); background: color-mix(in srgb, var(--cyan) 8%, transparent); }
.pillar .pk { font-family: var(--mono); font-size: 0.68rem; letter-spacing: 0.16em; color: var(--accent); text-transform: uppercase; margin-bottom: 10px; }
.pillar h4 { font-family: var(--serif); font-size: 1.45rem; margin-bottom: 4px; }
.pillar .sub { font-size: 0.82rem; color: var(--paper-mute); margin-bottom: 16px; }
.pillar .chem { font-family: var(--en); font-size: 0.78rem; letter-spacing: 0.1em; color: var(--accent-2); margin: 14px 0 10px; }
.pillar .pm { font-size: 0.85rem; color: var(--paper-dim); }
.pillar .up { color: var(--green); }
.pillar .down { color: var(--rose); }

.balance-diagram { margin: 30px auto 0; max-width: 600px; }
.balance-diagram svg { width: 100%; height: auto; }

/* diagnosis types (slide 11) */
.types { display: grid; grid-template-columns: repeat(3,1fr); gap: 18px; }
.type.answer { border-color: color-mix(in srgb, var(--cyan) 50%, transparent); box-shadow: 0 20px 60px -36px var(--cyan); }

/* =========================================================
   GPIE manifesto (slide 12)
   ========================================================= */
.manifesto-title {
  font-family: var(--en); font-weight: 700; font-size: clamp(2.6rem, 7.5vw, 5.6rem);
  line-height: 0.98; letter-spacing: -0.01em;
}
.manifesto-title span { display: block; color: var(--paper); }
.manifesto-title .e { -webkit-text-stroke: 1.5px var(--paper); color: transparent; }

.status-pill {
  display: inline-flex; align-items: center; gap: 9px;
  font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.16em; text-transform: uppercase;
  border: 1px solid color-mix(in srgb, var(--green) 50%, transparent); color: var(--green);
  border-radius: 999px; padding: 7px 16px; margin-top: 22px;
}
.status-pill .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--green); box-shadow: 0 0 12px var(--green); animation: pulse 1.8s infinite; }
@keyframes pulse { 0%,100%{opacity:1} 50%{opacity:.3} }

/* domains (slide 13) */
.domains { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }
.domain { border: 1px solid var(--line); border-radius: 16px; padding: 30px; background: linear-gradient(160deg, rgba(255,255,255,0.04), rgba(255,255,255,0.01)); transition: transform .5s var(--ease), border-color .4s; }
.domain:hover { transform: translateY(-5px); border-color: color-mix(in srgb, var(--violet) 45%, transparent); }
.domain .dk { font-family: var(--mono); font-size: 0.7rem; letter-spacing: 0.16em; color: var(--violet); text-transform: uppercase; margin-bottom: 14px; }
.domain h3 { font-family: var(--serif); font-size: 1.4rem; line-height: 1.4; margin-bottom: 14px; }
.domain p { color: var(--paper-dim); font-size: 0.9rem; line-height: 2; }

/* =========================================================
   End (slide 14)
   ========================================================= */
#end { text-align: center; }
#end .headline { margin: 0 auto; }
.tobe { font-family: var(--en); font-style: italic; color: var(--accent); letter-spacing: 0.1em; font-size: 1.1rem; }
.thanks { font-family: var(--serif); font-size: clamp(1.6rem,4vw,2.6rem); }

/* =========================================================
   Progress + nav
   ========================================================= */
.progress { position: fixed; top: 0; left: 0; height: 3px; width: 0; z-index: 60;
  background: linear-gradient(90deg, var(--cyan), var(--blue), var(--violet)); transition: width .15s linear; }

.topbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 50;
  display: flex; justify-content: space-between; align-items: center;
  padding: 16px 28px; backdrop-filter: blur(10px);
  background: linear-gradient(180deg, rgba(7,7,12,0.85), rgba(7,7,12,0));
  transition: background .4s;
}
.brand { font-family: var(--en); font-weight: 700; letter-spacing: 0.22em; font-size: 0.95rem; }
.brand small { color: var(--paper-mute); font-weight: 400; letter-spacing: 0.14em; font-size: 0.68rem; display: block; }
.topbar .yr { font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.18em; color: var(--paper-mute); }

/* side section nav */
.dots {
  position: fixed; right: 22px; top: 50%; transform: translateY(-50%);
  z-index: 50; display: flex; flex-direction: column; gap: 6px; align-items: flex-end;
}
.dots a {
  position: relative;
  width: 132px; min-height: 22px;
  display: flex; align-items: center; justify-content: flex-end;
  padding: 0 20px 0 8px;
  border: 1px solid rgba(244,243,238,0.08);
  border-radius: 6px;
  background: rgba(7,7,12,0.38);
  color: #aeb6c8;
  transition: background .22s, border-color .22s, color .22s, box-shadow .22s;
}
.dots a::after {
  content: "";
  position: absolute; right: 0; top: 50%; transform: translate(17px, -50%);
  width: 9px; height: 9px; border-radius: 50%;
  border: 1px solid rgba(244,243,238,0.48);
  background: rgba(244,243,238,0.18);
  transition: background .22s, border-color .22s, box-shadow .22s;
}
.dots a span {
  position: static; transform: none;
  font-family: var(--en); font-size: 0.64rem; line-height: 1; letter-spacing: 0.08em; white-space: nowrap;
  color: inherit; opacity: 1; pointer-events: none; transition: none;
  background: transparent; padding: 0; border: 0; border-radius: 0;
  text-shadow: 0 1px 8px rgba(0,0,0,0.75);
}
.dots a:hover {
  color: #ffffff;
  background: rgba(7,7,12,0.82);
  border-color: color-mix(in srgb, var(--accent, var(--cyan)) 42%, transparent);
  box-shadow: 0 0 16px -10px var(--accent, var(--cyan));
}
.dots a:hover::after,
.dots a.active::after {
  background: var(--accent, var(--cyan));
  border-color: var(--accent, var(--cyan));
  box-shadow: 0 0 12px var(--accent, var(--cyan));
}
.dots a.active {
  color: #ffffff;
  background: rgba(7,7,12,0.92);
  border-color: color-mix(in srgb, var(--accent, var(--cyan)) 58%, transparent);
}
@media (max-height: 720px) {
  .dots { gap: 4px; }
  .dots a { width: 126px; min-height: 19px; padding-right: 18px; }
  .dots a span { font-size: 0.58rem; letter-spacing: 0.06em; }
}

/* =========================================================
   Reveal animation
   ========================================================= */
.reveal { opacity: 0; transform: translateY(34px); transition: opacity 1s var(--ease), transform 1s var(--ease); }
.reveal.in { opacity: 1; transform: none; }
.reveal[data-d="1"]{ transition-delay:.08s } .reveal[data-d="2"]{ transition-delay:.16s }
.reveal[data-d="3"]{ transition-delay:.24s } .reveal[data-d="4"]{ transition-delay:.32s }
.reveal[data-d="5"]{ transition-delay:.40s } .reveal[data-d="6"]{ transition-delay:.48s }

/* ambient blob */
.blob { position: absolute; border-radius: 50%; filter: blur(70px); opacity: 0.5; pointer-events: none; z-index: 0; }
.slide-inner { position: relative; z-index: 2; }

/* =========================================================
   Responsive
   ========================================================= */
@media (max-width: 900px) {
  .cover-grid, .two-col { grid-template-columns: 1fr; gap: 34px; }
  .grid-3, .types, .balance { grid-template-columns: 1fr; }
  .grid-2, .domains { grid-template-columns: 1fr; }
  .flow { grid-template-columns: 1fr; }
  .op { transform: rotate(90deg); padding: 4px 0; }
  .phases { grid-template-columns: 1fr; }
  .arrow { transform: rotate(90deg); justify-self: center; }
  .cover-visual { height: 300px; }
  .dots { display: none; }
  .slide { padding: 100px 0 96px; }
  .meta-top { flex-direction: column; gap: 6px; margin-bottom: 32px; }
}
@media (max-width: 560px) {
  .wrap { padding: 0 18px; }
  .jobs thead { display: none; }
  .jobs td { display: block; padding: 6px 14px; }
  .jobs tr { display: block; padding: 14px 0; border-bottom: 1px solid var(--line); }
}

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1 !important; transform: none !important; }
  * { scroll-behavior: auto !important; }
}