/* philosophIAI v2 — « Une journée avec l'IA »
   Le ciel suit la lecture : on part du matin (le comment, le quotidien)
   et l'on arrive à la nuit (le pourquoi, les grandes questions). */

:root {
  --ink: #1f1a14;
  --ink-soft: #5a5046;
  --paper: #fbf6ec;
  --card: rgba(255, 252, 245, 0.82);
  --card-line: rgba(31, 26, 20, 0.14);
  --vermillon: #c4320a;
  --or: #ffc46a;
  --nuit: #0b1022;
  --serif: "Literata", Georgia, "Times New Roman", serif;
  --mono: "Martian Mono", ui-monospace, Menlo, monospace;
  --hand: "Patrick Hand", "Comic Sans MS", system-ui, sans-serif;
  --gutter: clamp(16px, 4vw, 40px);
  --measure: 40rem;
  color-scheme: light;
}

body.is-dark {
  --ink: #efe9dd;
  --ink-soft: #b9b2a6;
  --card: rgba(16, 21, 42, 0.72);
  --card-line: rgba(239, 233, 221, 0.16);
  --vermillon: #ff7a4d;
  color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(17px, 1.05vw + 12px, 20px);
  line-height: 1.62;
  color: var(--ink);
  background: var(--paper);
  overflow-x: hidden;
}

img, svg { max-width: 100%; display: block; }
a { color: inherit; text-decoration-color: var(--vermillon); text-underline-offset: .2em; }
a:hover { color: var(--vermillon); }
:focus-visible { outline: 2px solid var(--vermillon); outline-offset: 3px; border-radius: 4px; }

/* ---------- Ciel ---------- */
.sky {
  position: fixed; inset: 0; z-index: -1; pointer-events: none;
  background: linear-gradient(to bottom, var(--sky-top, #f6d7b8), var(--sky-bottom, #fbefe0));
}
.sky__stars { position: absolute; inset: 0; opacity: var(--stars, 0); transition: opacity .3s linear; }
.sky__stars i {
  position: absolute; width: 2px; height: 2px; border-radius: 50%; background: #fff;
  box-shadow: 0 0 4px rgba(255,255,255,.7);
  animation: twinkle var(--d, 4s) ease-in-out infinite alternate;
}
@keyframes twinkle { from { opacity: .25; } to { opacity: 1; } }
.sky__sun {
  position: absolute; width: clamp(70px, 9vw, 130px); aspect-ratio: 1; border-radius: 50%;
  left: var(--sun-x, 20%); top: var(--sun-y, 70%);
  transform: translate(-50%, -50%);
  background: radial-gradient(circle, #fff6dc 0 35%, var(--or) 60%, rgba(255,196,106,0) 72%);
  filter: drop-shadow(0 0 40px rgba(255, 170, 80, .55));
  opacity: var(--sun-o, 1);
}
.sky__moon {
  position: absolute; width: clamp(34px, 4vw, 54px); aspect-ratio: 1; border-radius: 50%;
  right: 12%; top: 14%;
  box-shadow: inset -10px 6px 0 0 #f4ecd6;
  opacity: var(--moon-o, 0);
  transform: rotate(-20deg);
}
@media (prefers-reduced-motion: reduce) { .sky__stars i { animation: none; } }

/* ---------- Mise en page ---------- */
.wrap { width: min(100% - 2 * var(--gutter), 72rem); margin-inline: auto; }
.measure { max-width: var(--measure); }
.center { margin-inline: auto; text-align: center; }

.kicker {
  font-family: var(--mono); font-size: .68rem; letter-spacing: .14em; text-transform: uppercase;
  color: var(--vermillon); margin: 0 0 1rem;
}
h1, h2, h3 { font-weight: 500; line-height: 1.12; letter-spacing: -.01em; margin: 0 0 .6em; text-wrap: balance; }
h1 { font-size: clamp(2.3rem, 5.5vw + .5rem, 4.6rem); }
h2 { font-size: clamp(1.7rem, 3vw + .6rem, 2.8rem); }
h3 { font-size: clamp(1.2rem, 1vw + .9rem, 1.5rem); }
p { margin: 0 0 1em; text-wrap: pretty; }
.lead { font-size: clamp(1.1rem, .6vw + 1rem, 1.35rem); color: var(--ink-soft); }
em.v { font-style: italic; color: var(--vermillon); }
.mono { font-family: var(--mono); font-size: .72rem; letter-spacing: .06em; }

section { padding-block: clamp(4rem, 10vh, 8rem); }

/* ---------- En-tête ---------- */
.site-head {
  position: sticky; top: 0; z-index: 10;
  backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
  background: color-mix(in srgb, var(--card) 70%, transparent);
  border-bottom: 1px solid var(--card-line);
}
.site-head .wrap { display: flex; align-items: center; justify-content: space-between; gap: 1rem; min-height: 60px; }
.logo { font-family: var(--serif); font-size: 1.25rem; text-decoration: none; letter-spacing: -.01em; white-space: nowrap; }
.logo b { font-weight: 600; color: var(--vermillon); }
.site-nav { display: flex; gap: clamp(.7rem, 2vw, 1.6rem); font-family: var(--mono); font-size: .68rem; letter-spacing: .08em; text-transform: uppercase; }
.site-nav a { text-decoration: none; padding: .4rem 0; }
.site-nav a[aria-current="page"] { color: var(--vermillon); }
@media (max-width: 640px) {
  .site-head .wrap { flex-wrap: wrap; justify-content: center; padding-block: .5rem; min-height: 0; gap: .2rem; }
  .site-nav { font-size: .6rem; gap: .9rem; }
}

/* ---------- Boutons ---------- */
.btns { display: flex; flex-wrap: wrap; gap: .8rem; margin-top: 2rem; }
.center .btns { justify-content: center; }
.btn {
  display: inline-flex; align-items: center; gap: .55em;
  font-family: var(--mono); font-size: .72rem; letter-spacing: .06em; text-transform: uppercase;
  padding: .95em 1.4em; border-radius: 999px; text-decoration: none;
  background: var(--ink); color: var(--paper); border: 1px solid var(--ink);
  transition: transform .2s ease, background .2s ease;
}
body.is-dark .btn { color: var(--nuit); }
.btn:hover { transform: translateY(-2px); color: var(--paper); background: var(--vermillon); border-color: var(--vermillon); }
.btn--ghost { background: transparent; color: var(--ink); }
body.is-dark .btn--ghost { color: var(--ink); }

/* ---------- Héros ---------- */
.hero { min-height: calc(100svh - 60px); display: grid; align-content: center; padding-block: 3rem 5rem; }
.hero h1 { max-width: 14ch; }
.hero .lead { max-width: 34rem; }
.hero__clock { font-family: var(--mono); font-size: .8rem; color: var(--ink-soft); margin-bottom: 1.5rem; display: flex; gap: .6rem; align-items: center; }
.hero__clock::before { content: ""; width: 8px; height: 8px; border-radius: 50%; background: var(--vermillon); animation: pulse 2s ease-in-out infinite; }
@keyframes pulse { 50% { opacity: .3; } }

/* ---------- Le chemin (BD → histoire → idées → porte) ---------- */
.path { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; background: var(--card-line); border: 1px solid var(--card-line); border-radius: 18px; overflow: hidden; margin-top: 2.5rem; }
.path > div { background: var(--card); padding: 1.4rem 1.3rem 1.5rem; }
.path .num { font-family: var(--mono); font-size: .65rem; color: var(--vermillon); letter-spacing: .1em; }
.path h3 { margin: .5rem 0 .35rem; font-size: 1.15rem; }
.path p { font-size: .9rem; color: var(--ink-soft); margin: 0; }
@media (max-width: 820px) { .path { grid-template-columns: 1fr 1fr; } }
@media (max-width: 460px) { .path { grid-template-columns: 1fr; } }

/* ---------- La journée : les questions du comment ---------- */
.day { position: relative; margin-top: 3rem; }
.day::before { content: ""; position: absolute; left: 4.6rem; top: .5rem; bottom: .5rem; width: 1px; background: var(--card-line); }
.hour { display: grid; grid-template-columns: 4.2rem 1fr; gap: 1.6rem; margin-bottom: 1.6rem; align-items: start; }
.hour time { font-family: var(--mono); font-size: .8rem; padding-top: 1.55rem; text-align: right; color: var(--ink-soft); position: relative; }
.hour time::after { content: ""; position: absolute; right: -1.15rem; top: 1.85rem; width: 9px; height: 9px; border-radius: 50%; background: var(--paper); border: 2px solid var(--vermillon); }
.axis {
  background: var(--card); border: 1px solid var(--card-line); border-radius: 18px;
  padding: 1.4rem 1.5rem 1.5rem; position: relative;
  transition: transform .25s ease, box-shadow .25s ease;
}
.axis:hover { transform: translateY(-3px); box-shadow: 0 18px 40px -24px rgba(0,0,0,.35); }
.axis__how { font-size: clamp(1.35rem, 1.5vw + 1rem, 1.85rem); margin: 0 0 .3rem; }
.axis__then { display: flex; gap: .6rem; align-items: baseline; font-size: 1.05rem; margin: 0 0 1rem; }
.axis__then::before { content: "↳"; color: var(--vermillon); font-family: var(--mono); }
.axis__pitch { font-family: var(--hand); font-size: 1.15rem; line-height: 1.35; color: var(--ink-soft); border-left: 3px solid var(--or); padding-left: .9rem; margin-bottom: 1rem; }
.axis__foot { display: flex; flex-wrap: wrap; gap: .5rem; align-items: center; justify-content: space-between; }
.tags { display: flex; flex-wrap: wrap; gap: .35rem; }
.tag { font-family: var(--mono); font-size: .6rem; letter-spacing: .08em; text-transform: uppercase; border: 1px solid var(--card-line); padding: .35em .7em; border-radius: 999px; color: var(--ink-soft); text-decoration: none; }
a.tag:hover { border-color: var(--vermillon); }
.status { font-family: var(--mono); font-size: .62rem; letter-spacing: .08em; text-transform: uppercase; color: var(--ink-soft); }
.status--open { color: var(--vermillon); }
.axis--open { border-color: color-mix(in srgb, var(--vermillon) 45%, transparent); }
.axis a.cover { position: absolute; inset: 0; border-radius: inherit; }
@media (max-width: 560px) {
  .day::before { left: .3rem; }
  .hour { grid-template-columns: 1fr; gap: .4rem; padding-left: 1.4rem; }
  .hour time { text-align: left; padding-top: 0; }
  .hour time::after { right: auto; left: -1.38rem; top: .3rem; }
}

/* ---------- La bascule ---------- */
.shift { min-height: 140svh; position: relative; }
.shift__sticky { position: sticky; top: 18vh; text-align: center; }
.shift__hows { list-style: none; padding: 0; margin: 0 auto 2.5rem; display: grid; gap: .3rem; font-size: clamp(1.1rem, 1.6vw + .7rem, 1.7rem); }
.shift__hows li { transition: opacity .6s ease, filter .6s ease, transform .6s ease; }
.shift__hows li.done { opacity: .28; filter: blur(1.5px); transform: scale(.96); text-decoration: line-through; text-decoration-color: var(--vermillon); }
.shift__why { font-size: clamp(1.8rem, 4vw + .5rem, 3.6rem); opacity: 0; transform: translateY(16px); transition: opacity .9s ease, transform .9s ease; max-width: 18ch; margin-inline: auto; }
.shift__why.on { opacity: 1; transform: none; }
.shift__note { max-width: 32rem; margin: 1.5rem auto 0; color: var(--ink-soft); opacity: 0; transition: opacity 1s ease .3s; }
.shift__why.on + .shift__note { opacity: 1; }
@media (prefers-reduced-motion: reduce) {
  .shift { min-height: 0; }
  .shift__sticky { position: static; }
  .shift__why, .shift__note { opacity: 1; transform: none; }
}

/* ---------- Constellation des notions ---------- */
.constellation { position: relative; margin-top: 3rem; }
.constellation svg.lines { position: absolute; inset: 0; width: 100%; height: 100%; pointer-events: none; overflow: visible; }
.constellation svg.lines line { stroke: rgba(239,233,221,.22); stroke-width: 1; stroke-dasharray: 3 5; }
.stars { display: grid; grid-template-columns: repeat(3, 1fr); gap: clamp(1.2rem, 4vw, 3.5rem) clamp(1rem, 3vw, 2.5rem); position: relative; }
.star { text-decoration: none; display: grid; justify-items: center; text-align: center; gap: .35rem; padding: .6rem; border-radius: 16px; transition: background .25s ease; }
.star:nth-child(3n+2) { transform: translateY(2.2rem); }
.star:hover { background: rgba(255,255,255,.05); color: var(--ink); }
.star__dot { width: 14px; height: 14px; border-radius: 50%; background: #fff; box-shadow: 0 0 0 6px rgba(255,196,106,.12), 0 0 22px 4px rgba(255,196,106,.55); margin-bottom: .5rem; transition: transform .3s ease; }
.star:hover .star__dot { transform: scale(1.4); }
.star__name { font-size: clamp(1.2rem, 1.2vw + .9rem, 1.6rem); }
.star__q { font-size: .88rem; color: var(--ink-soft); max-width: 18rem; }
@media (max-width: 640px) {
  .stars { grid-template-columns: 1fr 1fr; }
  .star:nth-child(3n+2) { transform: none; }
  .star:nth-child(even) { transform: translateY(1.4rem); }
}

/* ---------- Encadrés, citations ---------- */
.card { background: var(--card); border: 1px solid var(--card-line); border-radius: 20px; padding: clamp(1.4rem, 3vw, 2.4rem); }
blockquote { margin: 0; }
.quote { font-size: clamp(1.3rem, 1.6vw + .9rem, 2rem); line-height: 1.3; }
.quote cite { display: block; margin-top: 1rem; font-family: var(--mono); font-size: .65rem; font-style: normal; letter-spacing: .08em; text-transform: uppercase; color: var(--ink-soft); }
.dialogue { display: grid; gap: 1rem; margin: 2rem 0; }
.dialogue p { margin: 0; padding: 1rem 1.2rem; border-radius: 16px; max-width: 34rem; font-size: .98rem; }
.dialogue .h { background: var(--card); border: 1px solid var(--card-line); justify-self: end; border-bottom-right-radius: 4px; }
.dialogue .ia { background: color-mix(in srgb, var(--or) 18%, transparent); border: 1px solid color-mix(in srgb, var(--or) 40%, transparent); border-bottom-left-radius: 4px; }
.dialogue .who { display: block; font-family: var(--mono); font-size: .58rem; letter-spacing: .1em; text-transform: uppercase; color: var(--ink-soft); margin-bottom: .3rem; }

.keep { border-left: 3px solid var(--vermillon); padding: .2rem 0 .2rem 1rem; margin: 1.6rem 0; font-style: italic; }
.keep::before { content: "Question à garder en tête"; display: block; font-family: var(--mono); font-style: normal; font-size: .6rem; letter-spacing: .1em; text-transform: uppercase; color: var(--vermillon); margin-bottom: .3rem; }

/* ---------- Article long (histoire, essai) ---------- */
.prose { max-width: var(--measure); margin-inline: auto; }
.prose h2 { margin-top: 3.5rem; }
.prose h3 { margin-top: 2.5rem; font-family: var(--mono); font-size: .75rem; letter-spacing: .12em; text-transform: uppercase; color: var(--vermillon); font-weight: 500; }
.prose p.drop::first-letter { float: left; font-size: 3.6em; line-height: .85; padding: .08em .1em 0 0; color: var(--vermillon); }
.prose hr { border: 0; text-align: center; margin: 3rem 0; }
.prose hr::after { content: "✦"; color: var(--vermillon); letter-spacing: 1em; }
.prose .opti { font-family: var(--mono); font-size: .85em; background: color-mix(in srgb, var(--or) 18%, transparent); padding: .1em .35em; border-radius: 4px; }
.prose .aside { font-size: .92rem; color: var(--ink-soft); }

.two { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(1rem, 3vw, 2.5rem); }
@media (max-width: 760px) { .two { grid-template-columns: 1fr; } }

.ideas { counter-reset: idea; display: grid; gap: 1.2rem; margin-top: 2rem; }
.idea { counter-increment: idea; }
.idea h3::before { content: counter(idea, decimal-leading-zero) " — "; font-family: var(--mono); font-size: .8rem; color: var(--vermillon); }
.idea ul { margin: .4rem 0 0; padding-left: 1.2rem; columns: 2; }
@media (max-width: 520px) { .idea ul { columns: 1; } }

.next { text-align: center; }
.next .q { font-size: clamp(1.5rem, 2.5vw + .8rem, 2.4rem); max-width: 22ch; margin: .5rem auto 0; }

/* Sommaire de page */
.toc { display: flex; flex-wrap: wrap; gap: .5rem; margin-top: 2rem; }
.toc a { font-family: var(--mono); font-size: .66rem; letter-spacing: .08em; text-transform: uppercase; text-decoration: none; border: 1px solid var(--card-line); background: var(--card); padding: .7em 1.1em; border-radius: 999px; }
.toc a:hover { border-color: var(--vermillon); }
.toc b { color: var(--vermillon); font-weight: 500; }

/* ---------- BD ---------- */
.bd { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin-top: 2.5rem; }
@media (max-width: 900px) { .bd { grid-template-columns: 1fr 1fr; } }
@media (max-width: 560px) { .bd { grid-template-columns: 1fr; } }
.panel {
  position: relative; margin: 0; background: #fffdf7; color: #1f1a14;
  border: 3px solid #1f1a14; border-radius: 6px; overflow: hidden;
  aspect-ratio: 4 / 3.3;
  box-shadow: 5px 5px 0 rgba(31,26,20,.85);
}
.panel svg.scene { position: absolute; inset: 0; width: 100%; height: 100%; }
.panel .cap {
  position: absolute; top: 0; left: 0; z-index: 2;
  font-family: var(--mono); font-size: .58rem; letter-spacing: .08em; text-transform: uppercase;
  background: var(--or); color: #1f1a14; padding: .45em .75em; border-right: 2px solid #1f1a14; border-bottom: 2px solid #1f1a14;
}
.bubble {
  position: absolute; z-index: 3; font-family: var(--hand); font-size: clamp(.92rem, .9vw + .55rem, 1.08rem); line-height: 1.2;
  background: #fff; color: #1f1a14; border: 2px solid #1f1a14; border-radius: 16px; padding: .45em .7em; max-width: 62%;
}
.bubble::after {
  content: ""; position: absolute; width: 12px; height: 12px; background: #fff;
  border-right: 2px solid #1f1a14; border-bottom: 2px solid #1f1a14;
  bottom: -8px; left: var(--tail, 22%); transform: rotate(45deg);
}
.bubble--up::after { bottom: auto; top: -8px; transform: rotate(-135deg); }
.bubble--ia { background: #fff1d6; }
.bubble--ia::after { background: #fff1d6; }
.bubble--think { border-style: dashed; }
.bubble--think::after { display: none; }
.bubble b { font-weight: 400; color: #c4320a; }
.panel--final {
  aspect-ratio: auto; grid-column: 1 / -1; display: grid; place-items: center; text-align: center;
  background: #1f1a14; color: #fbf6ec; padding: clamp(1.6rem, 5vw, 3rem);
}
.panel--final p { font-size: clamp(1.3rem, 2vw + .7rem, 2.1rem); line-height: 1.25; max-width: 26ch; margin: 0 auto; }

/* Curseur « jusqu'où ? » */
.slider { margin-top: 2.5rem; }
.slider label { display: block; font-family: var(--mono); font-size: .68rem; letter-spacing: .1em; text-transform: uppercase; color: var(--vermillon); margin-bottom: 1rem; }
.slider input[type=range] { width: 100%; accent-color: var(--vermillon); }
.slider__steps { display: flex; justify-content: space-between; font-family: var(--mono); font-size: .6rem; color: var(--ink-soft); margin-top: .4rem; gap: .3rem; }
.slider__steps span { flex: 1; text-align: center; }
.slider__steps span:first-child { text-align: left; }
.slider__steps span:last-child { text-align: right; }
.slider output { display: block; margin-top: 1.4rem; font-size: 1.1rem; min-height: 3.4em; }
@media (max-width: 520px) { .slider__steps span:nth-child(even) { visibility: hidden; } }

/* ---------- Pied ---------- */
.site-foot { padding-block: 4rem 3rem; border-top: 1px solid var(--card-line); margin-top: 4rem; font-size: .9rem; color: var(--ink-soft); }
.site-foot .wrap { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 1.5rem; }
.site-foot .motto { font-style: italic; color: var(--ink); }

/* ---------- Apparition au défilement ---------- */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity .8s ease, transform .8s ease; }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) { .reveal { opacity: 1; transform: none; } }
.no-js .reveal { opacity: 1; transform: none; }