/* =========================================================
   CAHIERS MANUFACTORIEL — Design System
   Moderne & audacieux · responsive · bilingue
   ========================================================= */

:root {
  /* Palette */
  --ink: #131210;
  --ink-soft: #2a2723;
  --paper: #f4efe6;
  --paper-2: #ece5d8;
  --white: #ffffff;
  --vermilion: #e2391c;
  --vermilion-dk: #b82a12;
  --ochre: #e8a33d;
  --clay: #8a4b2e;
  --cobalt: #20324d;
  --line: rgba(19, 18, 16, 0.14);
  --muted: #6c655b;

  /* Type */
  --sans: "Helvetica Neue", "Arial", system-ui, sans-serif;
  --serif: "Georgia", "Times New Roman", serif;

  /* Spacing / layout */
  --maxw: 1320px;
  --gutter: clamp(1.1rem, 4vw, 4rem);
  --radius: 4px;
  --header-h: 72px;

  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  font-family: var(--sans);
  background: var(--paper);
  color: var(--ink);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; }

::selection { background: var(--vermilion); color: var(--white); }

/* ---------- Typographic scale ---------- */
h1, h2, h3, h4 { margin: 0 0 .4em; font-weight: 800; line-height: 1.02; letter-spacing: -0.02em; }
.display {
  font-size: clamp(2.6rem, 9vw, 8.5rem);
  text-transform: uppercase;
  line-height: 0.92;
  letter-spacing: -0.03em;
}
.eyebrow {
  font-size: .72rem;
  text-transform: uppercase;
  letter-spacing: .28em;
  font-weight: 700;
  color: var(--vermilion);
}
.lead { font-size: clamp(1.05rem, 2.2vw, 1.5rem); line-height: 1.45; max-width: 60ch; }

/* ---------- Layout helpers ---------- */
.wrap { width: 100%; max-width: var(--maxw); margin: 0 auto; padding-inline: var(--gutter); }
.section { padding-block: clamp(3.5rem, 9vw, 8rem); }
.section-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 2rem; flex-wrap: wrap; margin-bottom: clamp(1.8rem, 4vw, 3.5rem); }
.section-head h2 { font-size: clamp(1.9rem, 5vw, 3.6rem); text-transform: uppercase; margin: 0; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: .6em;
  padding: .95em 1.7em;
  font-size: .82rem; font-weight: 700; text-transform: uppercase; letter-spacing: .14em;
  border: 1.5px solid var(--ink); background: var(--ink); color: var(--paper);
  border-radius: 999px;
  transition: transform .35s var(--ease), background .3s, color .3s;
}
.btn:hover { transform: translateY(-3px); background: var(--vermilion); border-color: var(--vermilion); color: #fff; }
.btn--ghost { background: transparent; color: var(--ink); }
.btn--ghost:hover { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.btn--accent { background: var(--vermilion); border-color: var(--vermilion); color: #fff; }
.btn--accent:hover { background: var(--ink); border-color: var(--ink); }
.btn--sm { padding: .6em 1.1em; font-size: .72rem; }
.btn[disabled] { opacity: .4; pointer-events: none; }

/* =========================================================
   HEADER
   ========================================================= */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(244, 239, 230, 0.82);
  backdrop-filter: saturate(140%) blur(14px);
  border-bottom: 1px solid var(--line);
  transition: transform .4s var(--ease);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; height: var(--header-h); }
.brand { display: flex; flex-direction: column; line-height: 1; }
.brand b { font-size: 1.02rem; font-weight: 800; text-transform: uppercase; letter-spacing: -0.01em; }
.brand span { font-size: .58rem; letter-spacing: .3em; text-transform: uppercase; color: var(--muted); margin-top: 3px; }

.nav { display: flex; align-items: center; gap: clamp(1rem, 2.4vw, 2.3rem); }
.nav a.navlink { font-size: .78rem; text-transform: uppercase; letter-spacing: .14em; font-weight: 600; position: relative; padding: .3em 0; }
.nav a.navlink::after { content: ""; position: absolute; left: 0; bottom: 0; height: 2px; width: 0; background: var(--vermilion); transition: width .35s var(--ease); }
.nav a.navlink:hover::after, .nav a.navlink.active::after { width: 100%; }

.header-tools { display: flex; align-items: center; gap: 1rem; }
.lang-toggle { display: inline-flex; border: 1px solid var(--line); border-radius: 999px; overflow: hidden; }
.lang-toggle button { background: transparent; border: 0; padding: .35em .7em; font-size: .68rem; font-weight: 700; letter-spacing: .1em; color: var(--muted); }
.lang-toggle button.active { background: var(--ink); color: var(--paper); }

.cart-btn { position: relative; background: transparent; border: 0; display: inline-flex; align-items: center; gap: .4em; font-size: .78rem; font-weight: 700; text-transform: uppercase; letter-spacing: .12em; }
.cart-count {
  min-width: 20px; height: 20px; padding: 0 5px; border-radius: 999px;
  background: var(--vermilion); color: #fff; font-size: .66rem; font-weight: 800;
  display: inline-flex; align-items: center; justify-content: center;
  transform: scale(0); transition: transform .3s var(--ease);
}
.cart-count.show { transform: scale(1); }

.burger { display: none; flex-direction: column; gap: 5px; background: transparent; border: 0; padding: 6px; }
.burger span { width: 24px; height: 2px; background: var(--ink); transition: .3s var(--ease); }
.burger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.burger.open span:nth-child(2) { opacity: 0; }
.burger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* =========================================================
   HERO
   ========================================================= */
.hero { position: relative; padding-top: clamp(2.5rem, 6vw, 5rem); padding-bottom: clamp(2.5rem, 6vw, 5rem); overflow: hidden; }
.hero::before {
  content: ""; position: absolute; inset: 0; z-index: -1;
  background:
    radial-gradient(60% 80% at 85% 10%, rgba(226,57,28,.16), transparent 60%),
    radial-gradient(50% 60% at 5% 90%, rgba(232,163,61,.20), transparent 60%);
}
.hero-grid { display: grid; grid-template-columns: 1.15fr .85fr; gap: clamp(2rem, 5vw, 5rem); align-items: center; }
.hero h1 { margin: .2em 0 .4em; }
.hero h1 .o { color: var(--vermilion); }
.hero-cta { display: flex; gap: 1rem; flex-wrap: wrap; margin-top: 2rem; }
.hero-art { position: relative; aspect-ratio: 4/5; }
.hero-stats { display: flex; gap: clamp(1.5rem,4vw,3rem); margin-top: 3rem; border-top: 1px solid var(--line); padding-top: 1.5rem; }
.hero-stats div b { display: block; font-size: clamp(1.6rem, 4vw, 2.6rem); font-weight: 800; }
.hero-stats div span { font-size: .72rem; text-transform: uppercase; letter-spacing: .15em; color: var(--muted); }

/* Marquee */
.marquee { background: var(--ink); color: var(--paper); padding: .8rem 0; overflow: hidden; white-space: nowrap; }
.marquee-track { display: inline-block; animation: marquee 26s linear infinite; }
.marquee-track span { font-size: .9rem; text-transform: uppercase; letter-spacing: .22em; font-weight: 700; margin: 0 1.6rem; }
.marquee-track span .dot { color: var(--vermilion); margin-left: 1.6rem; }
@keyframes marquee { to { transform: translateX(-50%); } }

/* =========================================================
   BOOK COVER (CSS generated)
   ========================================================= */
.cover {
  position: relative; aspect-ratio: 3/4; border-radius: 3px; overflow: hidden;
  display: flex; flex-direction: column; justify-content: space-between;
  padding: 1rem; color: #fff;
  box-shadow: -10px 14px 30px rgba(0,0,0,.22), inset 14px 0 22px rgba(0,0,0,.16), inset 1px 0 0 rgba(255,255,255,.25);
  transition: transform .5s var(--ease), box-shadow .5s var(--ease);
}
.cover::before { /* spine */
  content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 10px;
  background: linear-gradient(90deg, rgba(0,0,0,.4), rgba(255,255,255,.12) 60%, rgba(0,0,0,.25));
}
.cover .c-num { font-size: .7rem; font-weight: 800; letter-spacing: .1em; opacity: .85; }
.cover .c-title { font-size: clamp(1rem, 2.4vw, 1.5rem); font-weight: 800; text-transform: uppercase; line-height: .98; letter-spacing: -.01em; }
.cover .c-author { font-size: .68rem; text-transform: uppercase; letter-spacing: .14em; opacity: .9; }
.cover .c-mark { font-size: .55rem; letter-spacing: .2em; text-transform: uppercase; opacity: .8; }

/* =========================================================
   PRODUCT GRID / CARDS
   ========================================================= */
.grid { display: grid; gap: clamp(1.4rem, 3vw, 2.6rem); }
.grid--cat { grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); }

.card { position: relative; }
.card .cover-wrap { perspective: 1200px; margin-bottom: 1rem; }
.card:hover .cover { transform: rotateY(-12deg) translateY(-6px); box-shadow: -18px 22px 44px rgba(0,0,0,.3); }
.card h3 { font-size: 1.05rem; text-transform: uppercase; margin: 0 0 .15em; letter-spacing: -.01em; }
.card .meta { font-size: .76rem; color: var(--muted); }
.card-foot { display: flex; align-items: center; justify-content: space-between; margin-top: .7rem; gap: .6rem; }
.price { font-weight: 800; font-size: 1rem; }
.tag { font-size: .6rem; font-weight: 800; text-transform: uppercase; letter-spacing: .12em; padding: .3em .6em; border-radius: 999px; }
.tag--preorder { background: var(--ochre); color: var(--ink); }
.tag--research { background: var(--cobalt); color: #fff; }
.tag--soon { background: var(--paper-2); color: var(--muted); }

/* Filter bar */
.filters { display: flex; gap: .5rem; flex-wrap: wrap; margin-bottom: 2rem; }
.chip { border: 1px solid var(--line); background: transparent; border-radius: 999px; padding: .5em 1.1em; font-size: .74rem; font-weight: 700; text-transform: uppercase; letter-spacing: .08em; transition: .25s; }
.chip.active, .chip:hover { background: var(--ink); color: var(--paper); border-color: var(--ink); }

/* =========================================================
   PRODUCT PAGE
   ========================================================= */
.product { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(2rem, 6vw, 5rem); align-items: start; }
.product-visual { position: sticky; top: calc(var(--header-h) + 1.5rem); }
.product-visual .cover { aspect-ratio: 3/4; max-width: 460px; margin-inline: auto; }
.product h1 { font-size: clamp(2rem, 6vw, 4rem); text-transform: uppercase; }
.product .price-lg { font-size: 1.8rem; font-weight: 800; margin: 1rem 0; }
.spec { width: 100%; border-collapse: collapse; margin: 1.5rem 0; }
.spec th, .spec td { text-align: left; padding: .7rem 0; border-bottom: 1px solid var(--line); font-size: .88rem; vertical-align: top; }
.spec th { width: 42%; text-transform: uppercase; letter-spacing: .08em; font-size: .72rem; color: var(--muted); font-weight: 700; }
.qty { display: inline-flex; align-items: center; border: 1.5px solid var(--ink); border-radius: 999px; overflow: hidden; }
.qty button { background: transparent; border: 0; padding: .5em .9em; font-size: 1.1rem; font-weight: 700; }
.qty input { width: 44px; text-align: center; border: 0; background: transparent; font-weight: 700; font-size: 1rem; -moz-appearance: textfield; }
.qty input::-webkit-outer-spin-button, .qty input::-webkit-inner-spin-button { -webkit-appearance: none; }
.buy-row { display: flex; gap: 1rem; align-items: center; flex-wrap: wrap; margin: 1.6rem 0; }

/* =========================================================
   CART / CHECKOUT
   ========================================================= */
.cart-layout { display: grid; grid-template-columns: 1.6fr .9fr; gap: clamp(2rem,5vw,4rem); align-items: start; }
.cart-item { display: grid; grid-template-columns: 84px 1fr auto; gap: 1.2rem; padding: 1.3rem 0; border-bottom: 1px solid var(--line); align-items: center; }
.cart-item .cover { aspect-ratio: 3/4; padding: .5rem; box-shadow: -4px 6px 14px rgba(0,0,0,.2); }
.cart-item .ci-title { font-weight: 800; text-transform: uppercase; font-size: .95rem; }
.cart-item .ci-meta { font-size: .76rem; color: var(--muted); }
.ci-remove { background: transparent; border: 0; color: var(--muted); font-size: .74rem; text-decoration: underline; margin-top: .3rem; }
.summary { background: var(--white); border: 1px solid var(--line); border-radius: var(--radius); padding: 1.8rem; position: sticky; top: calc(var(--header-h) + 1.5rem); }
.summary h3 { text-transform: uppercase; font-size: 1.1rem; }
.summary .row { display: flex; justify-content: space-between; padding: .55rem 0; font-size: .9rem; }
.summary .row.total { border-top: 1px solid var(--line); margin-top: .6rem; padding-top: 1rem; font-size: 1.25rem; font-weight: 800; }
.summary .btn { width: 100%; justify-content: center; margin-top: 1.2rem; }

.empty-state { text-align: center; padding: clamp(3rem,8vw,6rem) 1rem; }
.empty-state h2 { font-size: clamp(1.6rem,5vw,2.6rem); text-transform: uppercase; }

.field { margin-bottom: 1.1rem; }
.field label { display: block; font-size: .72rem; text-transform: uppercase; letter-spacing: .12em; font-weight: 700; margin-bottom: .4rem; color: var(--muted); }
.field input, .field select, .field textarea {
  width: 100%; padding: .85em 1em; border: 1.5px solid var(--line); border-radius: var(--radius);
  background: var(--white); font-family: inherit; font-size: .95rem;
}
.field input:focus, .field select:focus, .field textarea:focus { outline: none; border-color: var(--ink); }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.toast {
  position: fixed; bottom: 1.5rem; left: 50%; transform: translateX(-50%) translateY(200%);
  background: var(--ink); color: var(--paper); padding: .9em 1.5em; border-radius: 999px;
  font-size: .85rem; font-weight: 700; z-index: 300; transition: transform .45s var(--ease);
  box-shadow: 0 10px 30px rgba(0,0,0,.3);
}
.toast.show { transform: translateX(-50%) translateY(0); }

/* =========================================================
   EDITORIAL / FEATURE BLOCKS
   ========================================================= */
.feature { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(2rem,5vw,4rem); align-items: center; }
.feature.rev .feature-text { order: 2; }
.feature-text .eyebrow { margin-bottom: 1rem; }
.split-stat { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); }
.split-stat div { background: var(--paper); padding: 1.5rem 1.2rem; }
.split-stat b { display: block; font-size: clamp(1.6rem,4vw,2.4rem); font-weight: 800; }
.split-stat span { font-size: .72rem; text-transform: uppercase; letter-spacing: .12em; color: var(--muted); }

.values { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px,1fr)); gap: 1.5rem; }
.value-card { border-top: 3px solid var(--vermilion); padding-top: 1.2rem; }
.value-card h3 { font-size: 1.1rem; text-transform: uppercase; }
.value-card p { font-size: .92rem; color: var(--ink-soft); }

/* =========================================================
   FOOTER
   ========================================================= */
.site-footer { background: var(--ink); color: var(--paper); padding-block: clamp(3rem,7vw,5rem) 2rem; margin-top: 4rem; }
.footer-top { display: grid; grid-template-columns: 1.6fr 1fr 1fr; gap: 2.5rem; padding-bottom: 3rem; border-bottom: 1px solid rgba(255,255,255,.14); }
.footer-top h4 { text-transform: uppercase; font-size: .78rem; letter-spacing: .16em; color: var(--ochre); margin-bottom: 1rem; }
.footer-top a { display: block; padding: .25rem 0; font-size: .9rem; color: rgba(244,239,230,.78); transition: color .2s; }
.footer-top a:hover { color: #fff; }
.footer-brand .display { font-size: clamp(2.2rem,6vw,4rem); margin: 0; }
.footer-newsletter { display: flex; gap: .5rem; margin-top: 1rem; max-width: 340px; }
.footer-newsletter input { flex: 1; background: transparent; border: 1px solid rgba(255,255,255,.3); border-radius: 999px; padding: .7em 1.1em; color: #fff; }
.footer-newsletter button { border: 0; background: var(--vermilion); color: #fff; border-radius: 999px; padding: 0 1.2em; font-weight: 800; }
.footer-bottom { display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap; padding-top: 1.5rem; font-size: .76rem; color: rgba(244,239,230,.6); }

/* =========================================================
   REVEAL ANIMATION
   ========================================================= */
.reveal { opacity: 0; transform: translateY(28px); transition: opacity .8s var(--ease), transform .8s var(--ease); }
.reveal.in { opacity: 1; transform: none; }

/* =========================================================
   RESPONSIVE
   ========================================================= */
@media (max-width: 980px) {
  .hero-grid, .product, .feature, .feature.rev .feature-text, .cart-layout, .footer-top { grid-template-columns: 1fr; }
  .feature.rev .feature-text { order: 0; }
  .product-visual { position: static; }
  .product-visual .cover { max-width: 320px; }
  .summary { position: static; }
  .footer-top { gap: 2rem; }
}

@media (max-width: 760px) {
  .nav { position: fixed; inset: var(--header-h) 0 auto 0; flex-direction: column; align-items: flex-start;
    background: var(--paper); padding: 1.5rem var(--gutter) 2rem; gap: 1.2rem; border-bottom: 1px solid var(--line);
    transform: translateY(-130%); transition: transform .4s var(--ease); box-shadow: 0 20px 30px rgba(0,0,0,.12); }
  .nav.open { transform: translateY(0); }
  .nav a.navlink { font-size: 1.1rem; }
  .burger { display: flex; }
  .nav .lang-toggle { margin-top: .5rem; }
  .hero-stats { flex-wrap: wrap; gap: 1.4rem; }
  .split-stat { grid-template-columns: 1fr; }
  .cart-item { grid-template-columns: 64px 1fr; }
  .cart-item .ci-price { grid-column: 2; }
  .field-row { grid-template-columns: 1fr; }
}

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