/* ============================================================
   ARK Formation — index.css
   Styles de la landing page. Dépend de : global.css
   ============================================================ */

/* ── BASE ────────────────────────────────────────────────── */
html { scroll-behavior: smooth; }
body {
  background: var(--white);
  color: var(--text-1);
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 17px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* ── NAV ─────────────────────────────────────────────────── */
nav { position: fixed; top: 0; left: 0; right: 0; z-index: 100; height: 52px; display: flex; align-items: center; justify-content: space-between; padding: 0 20px; background: rgba(255,255,255,.88); backdrop-filter: saturate(180%) blur(20px); -webkit-backdrop-filter: saturate(180%) blur(20px); border-bottom: 1px solid var(--border); }
.nav-logo { font-size: 16px; font-weight: 600; letter-spacing: -.01em; }
.nav-links { display: flex; gap: 24px; list-style: none; }
.nav-links a { font-size: 13px; color: var(--text-2); text-decoration: none; transition: color .15s; }
.nav-links a:hover { color: var(--text-1); }
.nav-cta { font-size: 13px; font-weight: 500; color: var(--accent); text-decoration: none; white-space: nowrap; }

/* ── ARK LOGO ────────────────────────────────────────────── */
#ark-logo { font-family: 'Times New Roman', serif; font-size: clamp(52px,15vw,140px); font-weight: 400; letter-spacing: .15em; line-height: 1; margin-bottom: 24px; will-change: filter, opacity; opacity: 0; animation: fadeUp .9s ease .05s forwards; }

/* ── HERO ────────────────────────────────────────────────── */
.hero { min-height: 100vh; display: flex; flex-direction: column; align-items: center; justify-content: center; text-align: center; padding: 100px 20px 60px; background: var(--off-white); }
.hero-eyebrow { font-size: 12px; font-weight: 500; color: var(--accent); letter-spacing: .04em; margin-bottom: 16px; opacity: 0; animation: fadeUp .7s ease .2s forwards; }
.hero-title { font-size: clamp(34px,7.5vw,88px); font-weight: 600; letter-spacing: -.03em; line-height: 1.05; margin-bottom: 20px; max-width: 820px; opacity: 0; animation: fadeUp .7s ease .3s forwards; }
.hero-title .accent { color: var(--accent); }
.hero-sub { font-size: clamp(15px,2.5vw,21px); font-weight: 300; color: var(--text-2); max-width: 500px; line-height: 1.6; margin-bottom: 36px; opacity: 0; animation: fadeUp .7s ease .4s forwards; }
.hero-actions { display: flex; gap: 16px; align-items: center; flex-wrap: wrap; justify-content: center; opacity: 0; animation: fadeUp .7s ease .5s forwards; }
.hero-footnote { margin-top: 40px; font-size: 12px; color: var(--text-3); line-height: 1.9; opacity: 0; animation: fadeUp .7s ease .6s forwards; }

/* ── BOUTONS ─────────────────────────────────────────────── */
.btn-primary { font-size: 16px; font-weight: 500; background: var(--accent); color: #fff; padding: 14px 26px; border-radius: 980px; text-decoration: none; transition: all .2s; display: inline-block; white-space: nowrap; }
.btn-primary:hover { background: var(--accent-h); transform: scale(1.02); }
.btn-ghost { font-size: 16px; font-weight: 500; color: var(--accent); text-decoration: none; }
.btn-ghost::after { content: ' →'; }
.btn-ghost:hover { opacity: .7; }

/* ── STATEMENT ───────────────────────────────────────────── */
.statement { background: var(--text-1); padding: 80px 20px; text-align: center; }
.statement-text { font-size: clamp(18px,4vw,44px); font-weight: 500; letter-spacing: -.02em; line-height: 1.35; color: var(--white); max-width: 700px; margin: 0 auto; }
.statement-text em { color: #86c7f5; font-style: normal; }

/* ── SECTIONS ────────────────────────────────────────────── */
.section { padding: 80px 20px; }
.section-center { text-align: center; }
.section-bg { background: var(--light-gray); }
.inner    { max-width: 680px; margin: 0 auto; }
.inner-sm { max-width: 680px; margin: 0 auto; }
.section-eyebrow { font-size: 12px; font-weight: 500; color: var(--accent); letter-spacing: .04em; margin-bottom: 10px; }
.section-title { font-size: clamp(26px,5vw,56px); font-weight: 600; letter-spacing: -.025em; line-height: 1.08; margin-bottom: 14px; }
.section-sub { font-size: clamp(15px,2vw,19px); font-weight: 300; color: var(--text-2); line-height: 1.6; max-width: 520px; margin: 0 auto; }

/* ── STATS ───────────────────────────────────────────────── */
.stats-row { display: grid; grid-template-columns: repeat(3,1fr); gap: 1px; background: var(--mid-gray); border-radius: var(--r-lg); overflow: hidden; max-width: 860px; margin: 48px auto 0; }
.stat-cell { background: var(--white); padding: 40px 20px; text-align: center; }
.stat-val { font-size: clamp(32px,6vw,52px); font-weight: 600; letter-spacing: -.03em; line-height: 1; margin-bottom: 8px; }
.stat-label { font-size: 13px; color: var(--text-2); font-weight: 300; }

/* ── MANIFESTO ───────────────────────────────────────────── */
.manifesto-block { max-width: 720px; margin: 0 auto; text-align: center; }
.manifesto-quote { font-size: clamp(17px,2.8vw,28px); font-weight: 400; letter-spacing: -.015em; line-height: 1.55; margin-bottom: 28px; }
.manifesto-quote strong { font-weight: 600; }
.manifesto-body { font-size: clamp(14px,1.8vw,17px); color: var(--text-2); line-height: 1.75; font-weight: 300; }

/* ── PROGRAMME SLIDER ────────────────────────────────────── */
.programme-slider-wrap { margin-top: 28px; margin-left: -20px; margin-right: -20px; }
.prog-card-grid { width: 100%; height: 700px; display: flex; overflow-x: auto; overflow-y: hidden; align-items: center; scroll-snap-type: x mandatory; scrollbar-width: none; }
.prog-card-grid::-webkit-scrollbar { display: none; }
.prog-card-inner { display: flex; align-items: center; justify-content: flex-start; gap: 80px; padding: 300px 300px; }
.prog-card { width: calc(70vw - 2 * var(--gallery-pad)); height: 700px; flex-shrink: 0; scroll-snap-align: center; background: #0a0a0a; border-radius: 24px; display: flex; flex-direction: row; position: relative; overflow: hidden; }
.prog-card::before { content: ''; position: absolute; inset: 0; border-radius: 24px; border: 1px solid rgba(255,255,255,.08); pointer-events: none; z-index: 2; }
.prog-card-content { position: relative; z-index: 1; padding: 44px 100px; display: flex; flex-direction: column; justify-content: center; flex: 1; }
.prog-bg { position: absolute; bottom: 0; left: 0; right: 0; height: 65%; z-index: 0; pointer-events: none; }
.prog-card-macro .prog-bg { background: radial-gradient(ellipse at 30% 90%,rgba(0,210,180,.6) 0%,rgba(0,120,255,.2) 45%,transparent 70%); filter: blur(30px); }
.prog-card-geo   .prog-bg { background: radial-gradient(ellipse at 25% 90%,rgba(0,80,255,.75) 0%,rgba(0,40,180,.25) 50%,transparent 70%); filter: blur(30px); }
.prog-card-quant .prog-bg { background: radial-gradient(ellipse at 20% 90%,rgba(130,0,255,.8) 0%,rgba(80,0,200,.3) 45%,transparent 70%); filter: blur(30px); }
.prog-card-label { font-size: 11px; font-weight: 600; letter-spacing: .1em; text-transform: uppercase; color: rgba(255,255,255,.4); margin-bottom: 14px; }
.prog-card-title { font-size: clamp(28px,5vw,52px); font-weight: 600; letter-spacing: -.03em; line-height: 1.05; color: #fff; margin-bottom: 16px; }
.prog-card-desc  { font-size: clamp(13px,1.6vw,16px); font-weight: 300; color: rgba(255,255,255,.65); line-height: 1.7; max-width: 520px; }
.prog-card-tags  { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 20px; }
.prog-card-tag   { font-size: 11px; font-weight: 500; color: rgba(255,255,255,.6); background: rgba(255,255,255,.08); padding: 4px 11px; border-radius: 980px; border: 1px solid rgba(255,255,255,.1); }

/* ── SLIDER CONTROLS ─────────────────────────────────────── */
.slider-controls  { display: flex; align-items: center; justify-content: center; gap: 17px; margin-top: 28px; }
.slider-dots-bar  { display: flex; align-items: center; gap: 8px; background: rgba(0,0,0,.06); border-radius: 980px; padding: 14px 20px; }
.slider-dot       { width: 10px; height: 10px; border-radius: 50%; background: rgba(0,0,0,.18); border: none; cursor: pointer; padding: 0; transition: width .45s cubic-bezier(.4,0,.2,1), border-radius .45s; flex-shrink: 0; position: relative; overflow: hidden; }
.slider-dot.active{ width: 73px; border-radius: 6px; background: rgba(0,0,0,.15); }
.slider-dot-fill  { position: absolute; top: 0; left: 0; height: 100%; width: 0%; background: rgba(0,0,0,.65); border-radius: 6px; pointer-events: none; }
.slider-play-btn  { width: 38px; height: 38px; border-radius: 50%; background: rgba(0,0,0,.08); border: none; cursor: pointer; display: flex; align-items: center; justify-content: center; transition: background .15s; color: var(--text-1); }
.slider-play-btn:hover { background: rgba(0,0,0,.14); }
.slider-play-btn svg { width: 13px; height: 13px; fill: currentColor; }
.slider-play-wrap { flex-shrink: 0; }

/* ── FOR WHO ─────────────────────────────────────────────── */
.forwho-grid { max-width: 520px; margin: 48px auto 0; }
.forwho-card { border-radius: var(--r-lg); padding: 36px 28px; }
.forwho-card.yes { background: var(--text-1); }
.forwho-list { list-style: none; display: flex; flex-direction: column; gap: 14px; }
.forwho-list li { font-size: 15px; line-height: 1.5; display: flex; gap: 12px; align-items: flex-start; color: rgba(255,255,255,.85); }
.fi { flex-shrink: 0; color: #86c7f5; font-size: 13px; margin-top: 2px; }

/* ── PHILOSOPHY ──────────────────────────────────────────── */
.philosophy-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 16px; max-width: 960px; margin: 48px auto 0; }
.philosophy-card { background: var(--white); border-radius: var(--r-lg); padding: 28px 24px; border: 1px solid var(--mid-gray); }
.phil-icon  { width: 40px; height: 40px; border-radius: 10px; background: rgba(0,113,227,.08); display: flex; align-items: center; justify-content: center; font-size: 18px; margin-bottom: 14px; }
.phil-title { font-size: 16px; font-weight: 600; letter-spacing: -.01em; margin-bottom: 8px; }
.phil-text  { font-size: 13px; color: var(--text-2); line-height: 1.7; font-weight: 300; }

/* ── PRICING ─────────────────────────────────────────────── */
.pricing-inner       { max-width: 860px; margin: 48px auto 0; display: grid; grid-template-columns: 1fr 1fr; gap: 32px; align-items: center; }
.price-card          { border-radius: var(--r-lg); padding: 32px 28px; border: 1px solid var(--mid-gray); background: var(--white); position: relative; }
.price-card.featured { border-color: var(--accent); background: var(--text-1); }
.price-badge         { position: absolute; top: -12px; left: 50%; transform: translateX(-50%); background: var(--accent); color: #fff; font-size: 11px; font-weight: 600; letter-spacing: .05em; text-transform: uppercase; padding: 4px 14px; border-radius: 980px; white-space: nowrap; }
.price-tier          { font-size: 11px; font-weight: 500; color: rgba(255,255,255,.45); text-transform: uppercase; letter-spacing: .06em; margin-bottom: 8px; }
.price-row-amount    { display: flex; align-items: baseline; gap: 12px; margin-bottom: 4px; flex-wrap: wrap; }
.price-amount        { font-size: clamp(38px,6vw,52px); font-weight: 600; letter-spacing: -.03em; color: var(--white); line-height: 1; }
.price-strikethrough { font-size: 22px; font-weight: 500; color: rgba(255,255,255,.3); text-decoration: line-through; }
.price-period        { font-size: 12px; color: rgba(255,255,255,.4); margin-bottom: 24px; font-weight: 300; }
.price-divider       { height: 1px; background: rgba(255,255,255,.1); margin-bottom: 20px; }
.price-features      { list-style: none; display: flex; flex-direction: column; gap: 11px; margin-bottom: 28px; }
.price-features li   { font-size: 14px; display: flex; gap: 10px; align-items: flex-start; color: rgba(255,255,255,.75); line-height: 1.4; }
.check               { color: #86c7f5; flex-shrink: 0; font-size: 13px; }
.price-cta           { display: block; text-align: center; font-size: 15px; font-weight: 500; padding: 14px; border-radius: 980px; text-decoration: none; transition: all .2s; background: var(--accent); color: #fff; }
.price-cta:hover     { background: var(--accent-h); }
.price-small         { font-size: 11px; color: rgba(255,255,255,.3); text-align: center; margin-top: 12px; font-weight: 300; }
.price-note-bottom   { text-align: center; margin-top: 32px; font-size: 13px; color: var(--text-3); font-weight: 300; }

/* ── BOOK ────────────────────────────────────────────────── */
.book-wrap    { display: flex; flex-direction: column; align-items: center; gap: 14px; }
.book-caption { font-size: 12px; color: var(--text-3); font-style: italic; text-align: center; font-family: 'Times New Roman', serif; line-height: 1.6; }

/* ── AUTHOR ──────────────────────────────────────────────── */
.author-section { background: var(--light-gray); }
.author-inner   { max-width: 640px; margin: 0 auto; padding: 80px 20px; text-align: center; }
.author-avatar  { width: 88px; height: 88px; border-radius: 50%; background: var(--mid-gray); margin: 0 auto 20px; display: flex; align-items: center; justify-content: center; font-size: 28px; border: 3px solid var(--white); box-shadow: 0 4px 20px rgba(0,0,0,.1); }
.author-name    { font-size: clamp(22px,4vw,32px); font-weight: 600; letter-spacing: -.02em; margin-bottom: 4px; }
.author-title   { font-size: 14px; color: var(--text-2); font-weight: 300; margin-bottom: 24px; }
.author-bio     { font-size: clamp(14px,2vw,17px); font-weight: 300; line-height: 1.8; color: var(--text-2); margin-bottom: 28px; }
.author-bio strong { color: var(--text-1); font-weight: 500; }
.author-tags    { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; }
.author-tag     { font-size: 12px; color: var(--text-2); background: var(--white); border: 1px solid var(--mid-gray); padding: 5px 13px; border-radius: 980px; }

/* ── FAQ ─────────────────────────────────────────────────── */
.faq-wrap              { max-width: 640px; margin: 48px auto 0; }
.faq-item              { border-bottom: 1px solid var(--mid-gray); padding: 20px 0; cursor: pointer; }
.faq-item:first-child  { border-top: 1px solid var(--mid-gray); }
.faq-q                 { display: flex; justify-content: space-between; align-items: center; gap: 16px; }
.faq-q-text            { font-size: clamp(14px,2vw,17px); font-weight: 500; letter-spacing: -.01em; line-height: 1.4; }
.faq-icon              { font-size: 22px; color: var(--text-3); flex-shrink: 0; transition: transform .25s; line-height: 1; }
.faq-item.open .faq-icon { transform: rotate(45deg); }
.faq-a                 { font-size: 14px; color: var(--text-2); font-weight: 300; line-height: 1.7; max-height: 0; overflow: hidden; transition: max-height .3s ease, padding .3s; }
.faq-item.open .faq-a  { max-height: 240px; padding-top: 12px; }

/* ── FOOTER CTA ──────────────────────────────────────────── */
.footer-cta       { padding: 100px 20px; text-align: center; background: var(--off-white); }
.footer-cta-title { font-size: clamp(30px,7vw,72px); font-weight: 600; letter-spacing: -.035em; line-height: 1.05; margin-bottom: 16px; }
.footer-cta-title span { color: var(--accent); }
.footer-cta-sub   { font-size: clamp(14px,2vw,18px); font-weight: 300; color: var(--text-2); margin-bottom: 36px; max-width: 400px; margin-left: auto; margin-right: auto; line-height: 1.5; }

footer   { padding: 20px; border-top: 1px solid var(--mid-gray); text-align: center; }
footer p { font-size: 11px; color: var(--text-3); font-weight: 300; line-height: 1.8; }

/* ── ANIMATIONS ──────────────────────────────────────────── */
@keyframes fadeUp { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }
.reveal         { opacity: 0; transform: translateY(20px); transition: opacity .7s ease, transform .7s ease; }
.reveal.visible { opacity: 1; transform: translateY(0); }

/* ── RESPONSIVE ──────────────────────────────────────────── */
@media (max-width: 900px) {
  .philosophy-grid { grid-template-columns: 1fr 1fr; }
  .pricing-inner   { grid-template-columns: 1fr; max-width: 460px; }
  .book-wrap       { display: none; }
}
@media (max-width: 640px) {
  nav             { padding: 0 16px; }
  .nav-links      { display: none; }
  .hero           { padding: 90px 16px 52px; }
  .hero-actions   { flex-direction: column; width: 100%; gap: 12px; }
  .btn-primary    { width: 100%; text-align: center; padding: 16px 20px; font-size: 17px; }
  .btn-ghost      { font-size: 15px; }
  .section        { padding: 56px 16px; }
  .author-inner, .footer-cta { padding: 72px 16px; }
  .statement      { padding: 56px 16px; }
  .stats-row      { grid-template-columns: 1fr; border-radius: var(--r); }
  .stat-cell      { padding: 28px 20px; border-bottom: 1px solid var(--mid-gray); }
  .stat-cell:last-child { border-bottom: none; }
  .philosophy-grid  { grid-template-columns: 1fr; gap: 10px; }
  .philosophy-card  { padding: 22px 18px; }
  .forwho-card      { padding: 26px 20px; border-radius: var(--r); }
  .forwho-list li   { font-size: 14px; }
  .pricing-inner    { max-width: 100%; }
  .price-card       { padding: 28px 20px; }
  .faq-q-text       { font-size: 14px; }
  .author-avatar    { width: 72px; height: 72px; font-size: 24px; }
  .author-tags      { gap: 6px; }
  .author-tag       { font-size: 11px; padding: 4px 11px; }
  footer p          { font-size: 10px; }
  .prog-card        { padding: 36px 28px 40px; min-height: 360px; border-radius: 18px; }
  .slider-dot       { width: 6px; height: 6px; }
  .slider-dot.active{ width: 18px; }
}
@media (max-width: 380px) {
  #ark-logo       { font-size: 44px; letter-spacing: .08em; }
  .hero-title     { font-size: 30px; }
  .section-title  { font-size: 24px; }
}