/* Tandem — feuille de style principale */
:root {
  --ink: #0f1115;
  --ink-2: #2a2d35;
  --paper: #f5f2ec;
  --paper-2: #ebe6dc;
  --violet: #5b3df5;
  --violet-deep: #3a22c9;
  --lime: #d4ff4f;
  --muted: #6b6f78;
  --line: rgba(15, 17, 21, 0.12);
  --line-light: rgba(255, 255, 255, 0.18);

  --f-display: "Bricolage Grotesque", "Inter", system-ui, sans-serif;
  --f-body: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
  --f-mono: "JetBrains Mono", ui-monospace, "SFMono-Regular", Consolas, monospace;

  --gutter: clamp(16px, 4vw, 48px);
  --max: 1240px;
  --radius: 18px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

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

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--f-body);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img, svg { display: block; max-width: 100%; }
a { color: inherit; }

.wrap { width: 100%; max-width: var(--max); margin: 0 auto; padding: 0 var(--gutter); }

.label {
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h1, h2, h3 { font-family: var(--f-display); font-weight: 700; letter-spacing: -0.03em; line-height: 1; margin: 0; }
h2 { font-size: clamp(36px, 6vw, 76px); }
h3 { font-size: clamp(22px, 2.4vw, 28px); letter-spacing: -0.02em; line-height: 1.15; }
p { margin: 0; }

.btn {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 15px 24px; border-radius: 999px;
  font-weight: 600; font-size: 16px; text-decoration: none;
  transition: transform 0.3s var(--ease), background 0.3s, color 0.3s;
}
.btn:hover { transform: translateY(-2px); }
.btn .arrow { transition: transform 0.3s var(--ease); }
.btn:hover .arrow { transform: translateX(4px); }
.btn-lime { background: var(--lime); color: var(--ink); }
.btn-ink { background: var(--ink); color: var(--paper); }
.btn-ghost { border: 1px solid currentColor; }

/* ---------- Navigation ---------- */
.nav {
  position: fixed; inset: 0 0 auto 0; z-index: 50;
  padding: 16px 0;
  transition: background 0.4s, backdrop-filter 0.4s, color 0.4s;
  color: #fff;
}
.nav.scrolled { background: rgba(245, 242, 236, 0.85); backdrop-filter: blur(12px); color: var(--ink); border-bottom: 1px solid var(--line); }
.nav .wrap { display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.logo { display: flex; align-items: center; gap: 10px; text-decoration: none; font-family: var(--f-display); font-weight: 700; font-size: 22px; letter-spacing: -0.03em; }
.logo svg { width: 38px; height: 22px; }
.nav-links { display: flex; align-items: center; gap: 28px; list-style: none; margin: 0; padding: 0; font-size: 15px; }
.nav-links a { text-decoration: none; opacity: 0.85; }
.nav-links a:hover { opacity: 1; }
.lang { font-family: var(--f-mono); font-size: 12px; letter-spacing: 0.08em; display: flex; gap: 6px; }
.lang a { text-decoration: none; opacity: 0.5; }
.lang a[aria-current] { opacity: 1; }
.nav .btn { padding: 10px 18px; font-size: 14px; }
.nav.scrolled .btn-lime { background: var(--violet); color: #fff; }
.logo .wheel-b { stroke: var(--lime); transition: stroke 0.4s; }
.nav.scrolled .logo .wheel-b { stroke: var(--violet); }

/* ---------- Hero ---------- */
.hero {
  position: relative; min-height: 100svh;
  background: var(--violet); color: #fff;
  display: flex; align-items: center;
  padding: 120px 0 80px; overflow: hidden;
}
.hero .wrap { display: grid; grid-template-columns: 1.15fr 0.85fr; gap: 40px; align-items: center; }
.hero h1 { font-size: clamp(52px, 9vw, 132px); letter-spacing: -0.045em; line-height: 0.92; }
.hero h1 .hl { color: var(--lime); }
.hero .lead { margin-top: 28px; max-width: 540px; font-size: clamp(17px, 1.6vw, 20px); color: rgba(255, 255, 255, 0.85); }
.hero .ctas { margin-top: 36px; display: flex; flex-wrap: wrap; gap: 14px; }
.hero .tag { display: inline-flex; gap: 8px; align-items: center; margin-bottom: 28px; color: var(--lime); }
.hero .tag::before { content: ""; width: 8px; height: 8px; border-radius: 50%; background: var(--lime); animation: pulse 2s infinite; }
@keyframes pulse { 50% { opacity: 0.3; } }

.tandem-visual { position: relative; width: 100%; aspect-ratio: 1 / 0.82; }
.tandem-visual svg { width: 100%; height: 100%; overflow: visible; }
.wheel { transform-box: fill-box; transform-origin: center; }
.chain path { animation: chain 0.9s linear infinite; }
@keyframes chain { to { stroke-dashoffset: -16; } }
.speed line { animation: speed 1.6s linear infinite; }
.speed line:nth-child(2) { animation-delay: -0.6s; }
.speed line:nth-child(3) { animation-delay: -1.1s; }
@keyframes speed { 0% { transform: translateX(40px); opacity: 0; } 30% { opacity: 1; } 100% { transform: translateX(-60px); opacity: 0; } }
.ground { animation: chain 0.6s linear infinite; }

.bubble {
  position: absolute; z-index: 2;
  display: flex; flex-direction: column; gap: 4px;
  padding: 12px 16px; border-radius: 14px;
  box-shadow: 0 18px 40px rgba(20, 8, 90, 0.35);
  animation: bob 4s ease-in-out infinite;
  min-width: 190px;
}
.bubble .who { font-family: var(--f-mono); font-size: 10px; letter-spacing: 0.12em; text-transform: uppercase; opacity: 0.7; }
.bubble .what { font-family: var(--f-display); font-weight: 600; font-size: 17px; letter-spacing: -0.01em; transition: opacity 0.35s, transform 0.35s var(--ease); }
.bubble .what.out { opacity: 0; transform: translateY(8px); }
.bubble-agent { left: 0; top: 4%; background: var(--lime); color: var(--ink); }
.bubble-human { right: 0; top: 18%; background: #fff; color: var(--ink); animation-delay: -2s; }
.bubble::after { content: ""; position: absolute; bottom: -7px; width: 14px; height: 14px; background: inherit; transform: rotate(45deg); border-radius: 2px; }
.bubble-agent::after { left: 40%; }
.bubble-human::after { left: 30%; }
@keyframes bob { 50% { transform: translateY(-8px); } }

.hero .scroll-hint { position: absolute; left: var(--gutter); bottom: 28px; color: rgba(255, 255, 255, 0.6); }

/* Mots révélés */
.split .w { display: inline-block; overflow: hidden; vertical-align: top; padding-bottom: 0.08em; margin-bottom: -0.08em; }
.split .w > span { display: inline-block; transform: translateY(105%); transition: transform 0.9s var(--ease); }
.split.in .w > span { transform: none; }

/* ---------- Bande défilante ---------- */
.marquee { background: var(--ink); color: var(--paper); overflow: hidden; padding: 22px 0; border-block: 1px solid var(--ink-2); }
.marquee.lime { background: var(--lime); color: var(--ink); }
.marquee-track { display: flex; width: max-content; animation: marquee 32s linear infinite; }
.marquee-track span { font-family: var(--f-display); font-weight: 600; font-size: clamp(24px, 3.4vw, 44px); letter-spacing: -0.02em; padding-right: 0.6em; white-space: nowrap; }
.marquee-track span.dot { color: var(--violet); }
.marquee.lime .marquee-track span.dot { color: var(--violet); }
.marquee.reverse .marquee-track { animation-direction: reverse; }
@keyframes marquee { to { transform: translateX(-50%); } }

/* ---------- Sections ---------- */
section { position: relative; }
.section { padding: clamp(80px, 12vw, 160px) 0; }
.section-head { display: grid; grid-template-columns: 220px 1fr; gap: 32px; margin-bottom: clamp(48px, 7vw, 88px); }
.section-head .label { padding-top: 14px; color: var(--muted); }
.section-head .intro { margin-top: 24px; max-width: 640px; font-size: 19px; color: var(--ink-2); }
.dark { background: var(--ink); color: var(--paper); }
.dark .section-head .label { color: rgba(245, 242, 236, 0.55); }
.dark .section-head .intro { color: rgba(245, 242, 236, 0.75); }

.reveal { opacity: 0; transform: translateY(28px); transition: opacity 0.9s var(--ease), transform 0.9s var(--ease); }
.reveal.in { opacity: 1; transform: none; }

/* Problèmes */
.problems { display: grid; grid-template-columns: 1fr 1fr; gap: 0 48px; }
.problem { display: flex; gap: 18px; align-items: baseline; padding: 22px 0; border-top: 1px solid var(--line); font-size: clamp(18px, 1.8vw, 22px); }
.problem .x { font-family: var(--f-mono); color: var(--violet); font-size: 16px; flex: none; }

/* ---------- Échelle de maturité (défilement) ---------- */
.ladder-section { background: var(--ink); color: var(--paper); padding: clamp(64px, 9vw, 120px) 0; }
.ladder-scroll { height: 300vh; }
.ladder-sticky { position: sticky; top: 0; height: 100svh; display: flex; align-items: center; overflow: hidden; padding: 88px 0 32px; }
.ladder-sticky .wrap { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: 56px; align-items: center; }
.ladder-copy .label { color: var(--lime); }
.ladder-copy h2 { margin-top: 20px; }
.ladder-copy p { margin-top: 24px; color: rgba(245, 242, 236, 0.72); font-size: 18px; max-width: 460px; }
.ladder-progress { margin-top: 36px; height: 3px; background: rgba(255, 255, 255, 0.12); border-radius: 3px; overflow: hidden; max-width: 460px; }
.ladder-progress span { display: block; height: 100%; width: 0; background: var(--lime); }

.steps { display: flex; flex-direction: column-reverse; gap: 10px; }
.step {
  display: grid; grid-template-columns: 56px 1fr auto; gap: 18px; align-items: center;
  padding: 14px 22px; border-radius: 14px;
  border: 1px solid var(--line-light);
  background: rgba(255, 255, 255, 0.03);
  opacity: 0.35; transform: translateX(24px);
  transition: all 0.6s var(--ease);
}
.step:nth-child(1) { margin-right: 0; }
.step:nth-child(2) { margin-right: 6%; }
.step:nth-child(3) { margin-right: 12%; }
.step:nth-child(4) { margin-right: 18%; }
.step:nth-child(5) { margin-right: 24%; }
.step .num { font-family: var(--f-display); font-size: 34px; font-weight: 700; color: rgba(255, 255, 255, 0.4); }
.step .name { font-family: var(--f-display); font-weight: 600; font-size: 21px; letter-spacing: -0.01em; }
.step .desc { font-size: 14px; color: rgba(245, 242, 236, 0.65); line-height: 1.45; margin-top: 2px; }
.step .offer { font-family: var(--f-mono); font-size: 11px; letter-spacing: 0.08em; text-transform: uppercase; padding: 6px 10px; border-radius: 999px; border: 1px solid var(--line-light); white-space: nowrap; }
.step.on { opacity: 1; transform: none; }
.step.current { background: var(--violet); border-color: var(--violet); }
.step.current .num { color: var(--lime); }
.step.current .offer { background: var(--lime); color: var(--ink); border-color: var(--lime); }

/* ---------- Règle des 3 mois ---------- */
.payback { background: var(--lime); }
.payback .grid { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(32px, 6vw, 96px); align-items: center; }
.big-number { font-family: var(--f-display); font-weight: 800; font-size: clamp(120px, 20vw, 280px); line-height: 0.82; letter-spacing: -0.06em; }
.big-number small { display: block; font-size: 0.24em; letter-spacing: -0.02em; font-weight: 700; margin-top: 12px; }
.payback .copy p { margin-top: 20px; font-size: 19px; max-width: 520px; }
.formula { margin-top: 24px; font-family: var(--f-mono); font-size: 13px; background: rgba(15, 17, 21, 0.08); padding: 14px 16px; border-radius: 10px; line-height: 1.6; }

.calc { margin-top: 32px; background: var(--ink); color: var(--paper); border-radius: var(--radius); padding: 28px; }
.calc .row { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.calc label { display: block; font-family: var(--f-mono); font-size: 11px; letter-spacing: 0.1em; text-transform: uppercase; color: rgba(245, 242, 236, 0.6); margin-bottom: 10px; }
.calc .val { font-family: var(--f-display); font-size: 28px; font-weight: 600; }
.calc input[type="range"] { width: 100%; accent-color: var(--lime); }
.calc .result { margin-top: 24px; padding-top: 22px; border-top: 1px solid var(--line-light); display: flex; justify-content: space-between; align-items: end; gap: 16px; flex-wrap: wrap; }
.calc .result .amount { font-family: var(--f-display); font-size: clamp(36px, 5vw, 52px); font-weight: 700; color: var(--lime); letter-spacing: -0.03em; line-height: 1; }
.calc .note { font-size: 13px; color: rgba(245, 242, 236, 0.55); max-width: 260px; }

/* ---------- Offres ---------- */
.offers { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.offer-card {
  position: relative; display: flex; flex-direction: column; gap: 14px;
  min-height: 340px; padding: 28px; border-radius: var(--radius);
  background: #fff; border: 1px solid var(--line);
  transition: transform 0.5s var(--ease), background 0.4s, color 0.4s, border-color 0.4s;
}
.offer-card:hover { transform: translateY(-6px); background: var(--violet); color: #fff; border-color: var(--violet); }
.offer-card:hover .label, .offer-card:hover .price { color: var(--lime); }
.offer-card .label { color: var(--violet); }
.offer-card h3 { margin-top: 4px; }
.offer-card p { font-size: 16px; opacity: 0.85; }
.offer-card .price { margin-top: auto; font-family: var(--f-mono); font-size: 13px; letter-spacing: 0.04em; color: var(--ink-2); }
.offer-card.feature { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.offer-card.feature .label, .offer-card.feature .price { color: var(--lime); }
.offer-card .badge { position: absolute; top: 24px; right: 24px; font-family: var(--f-mono); font-size: 10px; letter-spacing: 0.1em; text-transform: uppercase; background: var(--lime); color: var(--ink); padding: 5px 9px; border-radius: 999px; }

/* ---------- Principes ---------- */
.principles { list-style: none; margin: 0; padding: 0; counter-reset: p; }
.principle { display: grid; grid-template-columns: 120px 1fr 1fr; gap: 32px; padding: 32px 0; border-top: 1px solid var(--line-light); align-items: baseline; }
.principle:last-child { border-bottom: 1px solid var(--line-light); }
.principle .n { font-family: var(--f-mono); font-size: 13px; color: var(--lime); }
.principle h3 { font-size: clamp(24px, 3vw, 38px); }
.principle p { color: rgba(245, 242, 236, 0.7); }

/* ---------- Preuve ---------- */
.proof { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 16px; }
.proof-card { border-radius: var(--radius); padding: clamp(28px, 4vw, 48px); background: #fff; border: 1px solid var(--line); }
.proof-card.main { background: var(--violet); color: #fff; border: 0; }
.proof-card.main .label { color: var(--lime); }
.proof-card h3 { margin-top: 18px; font-size: clamp(26px, 3vw, 40px); }
.proof-card p { margin-top: 16px; opacity: 0.85; }
.stats { margin-top: 32px; display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.stat .v { font-family: var(--f-display); font-size: clamp(40px, 5vw, 64px); font-weight: 700; letter-spacing: -0.04em; line-height: 1; color: var(--lime); }
.stat .k { font-size: 14px; opacity: 0.8; margin-top: 8px; }
.proof-card .label { color: var(--violet); }
.proof-card ul { margin: 20px 0 0; padding: 0; list-style: none; }
.proof-card li { padding: 12px 0; border-top: 1px solid var(--line); font-size: 16px; }

/* ---------- Appel final ---------- */
.final { background: var(--violet); color: #fff; text-align: center; overflow: hidden; }
.final h2 { font-size: clamp(48px, 9vw, 128px); letter-spacing: -0.045em; }
.final h2 .hl { color: var(--lime); }
.final p { margin: 28px auto 0; max-width: 560px; font-size: 19px; color: rgba(255, 255, 255, 0.85); }
.final .ctas { margin-top: 40px; display: flex; justify-content: center; flex-wrap: wrap; gap: 14px; }

/* ---------- Pied de page ---------- */
footer { background: var(--ink); color: rgba(245, 242, 236, 0.7); padding: 40px 0 24px; font-size: 14px; }
footer .top { display: flex; justify-content: space-between; gap: 24px; flex-wrap: wrap; padding-bottom: 24px; border-bottom: 1px solid var(--line-light); }
footer .logo { color: var(--paper); font-size: clamp(40px, 5vw, 60px); gap: 16px; align-self: center; line-height: 1; }
footer .logo svg { width: clamp(68px, 8.5vw, 100px); height: auto; }
footer .cols { display: flex; gap: 40px; flex-wrap: wrap; }
footer .cols div { display: flex; flex-direction: column; gap: 4px; }
footer .cols .label { color: rgba(245, 242, 236, 0.45); margin-bottom: 6px; }
footer a { text-decoration: none; }
footer a:hover { color: var(--lime); }
footer .bottom { display: flex; justify-content: space-between; align-items: center; gap: 16px; flex-wrap: wrap; padding-top: 18px; font-size: 12.5px; }

/* ---------- Écrans moyens : l'offre passe sous le nom ---------- */
@media (max-width: 1200px) {
  .step { grid-template-columns: 44px 1fr; gap: 4px 16px; }
  .step .num { grid-row: span 2; }
  .step .offer { grid-column: 2; justify-self: start; }
  .step:nth-child(n) { margin-right: 0; }
  .step:nth-child(2) { margin-left: 3%; }
  .step:nth-child(3) { margin-left: 6%; }
  .step:nth-child(4) { margin-left: 9%; }
  .step:nth-child(5) { margin-left: 12%; }
}

/* ---------- Mobile ---------- */
@media (max-width: 960px) {
  .nav-links li:not(.keep) { display: none; }
  .hero .wrap, .ladder-sticky .wrap, .payback .grid, .proof { grid-template-columns: 1fr; }
  .tandem-visual { max-width: 460px; margin: 0 auto; }
  .section-head { grid-template-columns: 1fr; gap: 12px; }
  .offers { grid-template-columns: 1fr 1fr; }
  .problems { grid-template-columns: 1fr; }
  .principle { grid-template-columns: 60px 1fr; }
  .principle p { grid-column: 2; }
  .ladder-sticky .wrap { gap: 28px; }
  .ladder-copy p { display: none; }
  .step { grid-template-columns: 32px 1fr; gap: 4px 12px; padding: 12px 16px; margin-right: 0 !important; margin-left: 0 !important; transform: translateY(8px); }
  .step .offer { grid-column: 2; justify-self: start; font-size: 10px; padding: 4px 8px; }
  .step .num { font-size: 24px; grid-row: span 2; }
  .step .name { font-size: 18px; }
}
@media (max-width: 620px) {
  body { font-size: 16px; }
  .offers { grid-template-columns: 1fr; }
  .offer-card { min-height: 0; }
  .calc .row { grid-template-columns: 1fr; }
  .nav .btn { display: none; }
  .step .desc { display: none; }
  .steps { gap: 8px; }
  .tandem-visual { padding-top: 64px; aspect-ratio: auto; }
  .bubble { min-width: 0; max-width: 49%; padding: 8px 12px; border-radius: 12px; }
  .bubble .what { font-size: 14px; }
  .bubble .who { font-size: 8.5px; letter-spacing: 0.08em; }
  .bubble-agent, .bubble-human { top: 0; }
  .ladder-copy h2 { font-size: 40px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .reveal, .split .w > span, .step { opacity: 1 !important; transform: none !important; }
  html { scroll-behavior: auto; }
}

/* Badge « fait par un agent » */
.made-by { display: inline-flex; align-items: center; gap: 10px; padding: 7px 14px 7px 8px; border-radius: 999px; border: 1px solid var(--line-light); color: var(--paper); font-size: 12.5px; transition: border-color 0.3s, background 0.3s; }
.made-by:hover { border-color: var(--lime); background: rgba(212, 255, 79, 0.06); color: var(--paper); }
.made-by .dot { width: 22px; height: 22px; border-radius: 50%; background: var(--lime); color: var(--ink); display: grid; place-items: center; font-size: 11px; font-weight: 700; flex: none; }
.made-by strong { color: var(--lime); font-weight: 600; }

/* Mobile polish (audit 2026-10-09) */
.calc .row > div { min-width: 0; }
.calc input[type="range"] { width: 100%; min-width: 0; box-sizing: border-box; }
@media (max-width: 960px) {
  .text-link { display: inline-flex; align-items: center; min-height: 44px; }
}