/* ------------------------------------------------------------------
   Bachelier Maths — landing styles
   Vanilla CSS, mobile-first, < 20 KB.
   ------------------------------------------------------------------ */

/* ---------- Tokens ------------------------------------------------ */
:root {
  --bg-primary: #0D0D14;
  --bg-elevated: #15151E;
  --bg-overlay: rgba(255, 255, 255, 0.04);

  --gold: #c9a84c;
  --gold-light: #e6c870;
  --gold-dark: #a08540;
  --blue: #4A9EFF;

  --text-primary: #FFFFFF;
  --text-secondary: rgba(255, 255, 255, 0.7);
  --text-muted: rgba(255, 255, 255, 0.5);
  --border: rgba(255, 255, 255, 0.1);

  --gradient-gold: linear-gradient(135deg, var(--gold-light) 0%, var(--gold) 50%, var(--gold-dark) 100%);
  --gradient-hero: radial-gradient(ellipse at top, rgba(74, 158, 255, 0.15) 0%, transparent 50%);

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;

  --transition-fast: 150ms ease;
  --transition-med: 250ms ease;
}

/* ---------- Fonts (self-hosted) ----------------------------------- */
@font-face {
  font-family: 'Poppins';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('/assets/fonts/Poppins-Regular.woff2') format('woff2');
}
@font-face {
  font-family: 'Poppins';
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url('/assets/fonts/Poppins-Medium.woff2') format('woff2');
}
@font-face {
  font-family: 'Poppins';
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url('/assets/fonts/Poppins-SemiBold.woff2') format('woff2');
}
@font-face {
  font-family: 'Poppins';
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url('/assets/fonts/Poppins-Bold.woff2') format('woff2');
}

/* ---------- Reset ------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: 'Poppins', -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", sans-serif;
  font-size: 15px;
  line-height: 1.6;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
img, svg { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
button {
  font-family: inherit; cursor: pointer;
  background: transparent; border: none; color: inherit; padding: 0;
}
ul { list-style: none; padding: 0; margin: 0; }
body.no-scroll { overflow: hidden; }

/* ---------- Layout primitives ------------------------------------- */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}
.section { padding: 64px 0; }
.section-narrow { padding: 48px 0; }
@media (min-width: 1024px) {
  .container { padding: 0 32px; }
  .section { padding: 120px 0; }
  .section-narrow { padding: 80px 0; }
}

/* ---------- Typography utilities ---------------------------------- */
.eyebrow {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--gold);
  background: rgba(201, 168, 76, 0.15);
  padding: 6px 14px;
  border-radius: 999px;
}
@media (min-width: 1024px) {
  .eyebrow { font-size: 12px; letter-spacing: 2px; }
}
.h-hero {
  font-size: 40px; line-height: 1.1; font-weight: 700;
  letter-spacing: -0.02em; margin: 0;
}
.h-section {
  font-size: 32px; line-height: 1.15; font-weight: 700;
  letter-spacing: -0.015em; margin: 0;
}
.h-card {
  font-size: 22px; line-height: 1.3; font-weight: 600;
  letter-spacing: -0.01em; margin: 0;
}
.body-lg {
  font-size: 17px; line-height: 1.5;
  color: var(--text-secondary);
}
.caption {
  font-size: 13px; line-height: 1.4; font-weight: 500;
  color: var(--text-muted);
}
@media (min-width: 1024px) {
  .h-hero    { font-size: 64px; line-height: 1.05; }
  .h-section { font-size: 48px; line-height: 1.1; }
  .h-card    { font-size: 26px; }
  .body-lg   { font-size: 19px; }
  .caption   { font-size: 14px; }
}

/* ---------- Header ------------------------------------------------ */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: transparent;
  transition: background-color var(--transition-med), backdrop-filter var(--transition-med);
}
.site-header.scrolled {
  background: rgba(13, 13, 20, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 60px;
}
@media (min-width: 1024px) { .header-inner { height: 72px; } }
.wordmark {
  font-size: 18px; font-weight: 700; letter-spacing: -0.01em;
  color: var(--text-primary);
}
@media (min-width: 1024px) { .wordmark { font-size: 20px; } }
/* Header brand: app-icon logo + wordmark (scoped so the footer wordmark is unaffected) */
.site-header .wordmark {
  display: inline-flex;
  align-items: center;
  gap: 9px;
}
.wordmark-logo {
  flex: 0 0 auto;
  width: 28px; height: 28px;
  border-radius: 6px;
}
@media (min-width: 1024px) {
  .wordmark-logo { width: 32px; height: 32px; border-radius: 7px; }
}
.nav-desktop {
  display: none;
  gap: 32px; align-items: center;
}
@media (min-width: 1024px) { .nav-desktop { display: flex; } }
.nav-desktop a {
  font-size: 15px; font-weight: 500; color: var(--text-secondary);
  transition: color var(--transition-fast);
}
.nav-desktop a:hover { color: var(--text-primary); }
.cta-header {
  display: inline-block;
  padding: 10px 20px;
  background: var(--gold);
  color: #000; font-weight: 600; font-size: 14px;
  border-radius: var(--radius-md);
  transition: transform var(--transition-fast), background var(--transition-fast);
}
.cta-header:hover { transform: scale(1.02); background: var(--gold-light); }

.nav-socials {
  display: inline-flex !important;
  flex-direction: row !important;
  flex-wrap: nowrap !important;
  align-items: center;
  gap: 18px;
  padding-left: 8px;
}
.nav-socials a {
  display: inline-flex;
  flex: 0 0 auto;
  width: 32px; height: 32px;
  align-items: center; justify-content: center;
  opacity: 0.75;
  transition: opacity var(--transition-fast), transform var(--transition-fast);
}
.nav-socials a:hover { opacity: 1; transform: scale(1.08); }
.nav-socials img { width: 26px; height: 26px; display: block; }
.menu-toggle {
  display: inline-flex; align-items: center; justify-content: center;
  width: 44px; height: 44px;
}
.menu-toggle svg { width: 24px; height: 24px; }
@media (min-width: 1024px) { .menu-toggle { display: none; } }

/* ---------- Mobile menu ------------------------------------------- */
.mobile-menu {
  position: fixed; inset: 0; z-index: 200;
  background: rgba(13, 13, 20, 0.97);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  display: flex; flex-direction: column;
  padding: 80px 24px 32px;
  transform: translateX(100%);
  transition: transform var(--transition-med);
}
.mobile-menu.open { transform: translateX(0); }
.mobile-menu-close {
  position: absolute; top: 12px; right: 16px;
  width: 44px; height: 44px;
  display: inline-flex; align-items: center; justify-content: center;
}
.mobile-menu nav {
  display: flex; flex-direction: column; gap: 4px;
}
.mobile-menu nav a {
  font-size: 22px; font-weight: 600; padding: 16px 0;
  border-bottom: 1px solid var(--border);
}
.mobile-menu .cta-mobile {
  margin-top: 32px;
}

/* ---------- Hero -------------------------------------------------- */
.hero {
  padding: 32px 0 64px;
  background: var(--gradient-hero);
}
.hero-inner {
  display: flex; flex-direction: column; gap: 40px;
  align-items: center;
}
.hero-content { text-align: center; }
.hero-content > * + * { margin-top: 20px; }
.hero h1 { margin-top: 24px; }
.hero-cta-row {
  display: flex; flex-direction: column; align-items: center; gap: 14px;
}
.hero-trust {
  color: var(--text-muted);
  font-size: 13px;
  letter-spacing: 0.2px;
}
.hero-socials {
  display: inline-flex !important;
  flex-direction: row !important;
  flex-wrap: nowrap !important;
  align-items: center;
  gap: 16px;
  padding: 8px 18px 8px 16px;
  background: var(--bg-overlay);
  border: 1px solid var(--border);
  border-radius: 999px;
  max-width: 100%;
}
.hero-socials > span {
  flex: 0 0 auto;
  font-size: 13px; font-weight: 500;
  color: var(--text-secondary);
  letter-spacing: 0.2px;
  margin-right: 2px;
  white-space: nowrap;
}
.hero-socials a {
  display: inline-flex;
  flex: 0 0 auto;
  width: 32px; height: 32px;
  align-items: center; justify-content: center;
  opacity: 0.85;
  transition: opacity var(--transition-fast), transform var(--transition-fast);
}
.hero-socials a:hover { opacity: 1; transform: scale(1.1); }
.hero-socials img { width: 28px; height: 28px; display: block; }
.hero-mockup {
  width: 100%;
  max-width: 320px;
}
.hero-mockup img { width: 100%; height: auto; }

@media (min-width: 1024px) {
  .hero { padding: 80px 0 120px; }
  .hero-inner {
    flex-direction: row; justify-content: space-between; gap: 64px;
    align-items: center;
  }
  .hero-content { flex: 1; text-align: left; }
  .hero-cta-row { flex-direction: row; align-items: center; gap: 24px; }
  .hero-mockup { flex: 0 0 360px; max-width: none; }
  .hero-mockup img { max-height: 680px; width: auto; margin: 0 auto; }
}

/* ---------- App Store badge --------------------------------------- */
.appstore-badge {
  display: inline-block;
  height: 56px;
  transition: transform var(--transition-fast);
}
.appstore-badge:hover { transform: scale(1.02); }
.appstore-badge img,
.appstore-badge svg { height: 100%; width: auto; }
@media (min-width: 1024px) { .appstore-badge { height: 64px; } }

/* ---------- Trust strip ------------------------------------------- */
.trust-strip {
  background: var(--bg-elevated);
  padding: 40px 0;
}
.trust-grid {
  display: grid; grid-template-columns: 1fr;
  gap: 28px;
  text-align: center;
}
.trust-item .trust-value {
  font-size: 24px; font-weight: 700; color: var(--text-primary);
  margin-bottom: 4px;
}
.trust-item .trust-label {
  font-size: 14px; color: var(--text-secondary);
}
@media (min-width: 768px) {
  .trust-grid { grid-template-columns: repeat(3, 1fr); }
}
@media (min-width: 1024px) {
  .trust-strip { padding: 56px 0; }
  .trust-item .trust-value { font-size: 28px; }
}

/* ---------- Reviews banner (compact, up to 4-line quote) ----------- */
.reviews-carousel {
  background: var(--bg-elevated);
  border-bottom: 1px solid var(--border);
  padding: 11px 0;
}
.reviews-bar {
  display: flex; align-items: center; gap: 12px;
}
.carousel-viewport {
  flex: 1 1 0;
  min-width: 0;
  overflow: hidden;
}
.carousel-track {
  display: flex; flex-wrap: nowrap; align-items: stretch;
  transition: transform 450ms cubic-bezier(.4, 0, .2, 1);
  will-change: transform;
}
.review-card {
  flex: 0 0 100%;
  min-width: 0;
  display: flex; flex-direction: column; justify-content: center;
  gap: 2px;
  padding: 2px 4px;
}
.review-header {
  display: flex; align-items: center; gap: 10px;
  min-width: 0;
  line-height: 1;
}
.review-stars {
  flex: 0 0 auto;
  color: var(--gold);
  font-size: 12px; letter-spacing: 2px;
  line-height: 1;
}
.review-author {
  flex: 1 1 auto;
  min-width: 0;
  font-size: 11.5px; font-weight: 500;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.review-quote {
  margin: 0;
  font-style: italic;
  color: var(--text-primary);
  font-size: 12px; line-height: 1.3;
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 4;
  overflow: hidden;
}
.carousel-arrow {
  flex: 0 0 32px;
  width: 32px; height: 32px;
  display: inline-flex !important; align-items: center; justify-content: center;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  border-radius: 50%;
  cursor: pointer;
  transition: background var(--transition-fast), color var(--transition-fast),
              border-color var(--transition-fast), transform var(--transition-fast);
}
.carousel-arrow:hover {
  background: var(--gold);
  border-color: var(--gold);
  color: #000;
}
.carousel-arrow:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 2px;
}

@media (max-width: 599px) {
  .review-quote { font-size: 11.5px; line-height: 1.3; -webkit-line-clamp: 4; }
}

@media (min-width: 1024px) {
  .reviews-carousel { padding: 14px 0; }
  .reviews-bar      { gap: 16px; }
  .review-stars     { font-size: 14px; }
  .review-quote     { font-size: 14px; line-height: 1.3; }
  .review-author    { font-size: 12.5px; }
}

@media (prefers-reduced-motion: reduce) {
  .carousel-track { transition: none; }
}

/* ---------- Features ---------------------------------------------- */
.section-heading {
  text-align: center; margin-bottom: 48px;
}
.section-heading > * + * { margin-top: 16px; }
.section-heading .body-lg {
  max-width: 640px; margin-left: auto; margin-right: auto;
}
.features-grid {
  display: grid; grid-template-columns: 1fr;
  gap: 20px;
}
@media (min-width: 768px) { .features-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1024px) { .features-grid { grid-template-columns: repeat(3, 1fr); gap: 24px; } }

.feature-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  display: flex; flex-direction: column;
  transition: transform var(--transition-med), border-color var(--transition-med);
}
.feature-card:hover {
  transform: translateY(-4px);
  border-color: rgba(201, 168, 76, 0.4);
}
.feature-icon {
  width: 48px; height: 48px;
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 32px;
  background: rgba(201, 168, 76, 0.12);
  border-radius: var(--radius-md);
  margin-bottom: 20px;
}
.feature-card h3 { margin-bottom: 12px; }
.feature-card p {
  color: var(--text-secondary);
  margin: 0;
  flex-grow: 1;
}
.feature-screenshot {
  margin-top: 20px;
}
.feature-screenshot img {
  height: 360px;
  width: auto;
  max-width: 100%;
  margin-inline: auto;
  border-radius: var(--radius-md);
}
.feature-illustration {
  margin-top: 24px;
  display: flex; justify-content: center; align-items: center;
  min-height: 120px;
}
@media (min-width: 1024px) {
  .feature-card { padding: 32px; }
  .feature-icon { width: 56px; height: 56px; font-size: 36px; }
}

/* ---------- Programme --------------------------------------------- */
.programme-grid {
  display: grid; grid-template-columns: 1fr;
  gap: 16px;
}
@media (min-width: 1024px) { .programme-grid { grid-template-columns: repeat(3, 1fr); gap: 24px; } }

.programme-card {
  background: var(--bg-elevated);
  border-left: 4px solid var(--gold);
  border-radius: var(--radius-md);
  padding: 28px;
}
.programme-card .eyebrow { margin-bottom: 20px; background: transparent; border: 1px solid rgba(201, 168, 76, 0.3); padding: 6px 12px; }
.programme-card .programme-intro {
  font-style: italic; color: var(--text-primary);
  font-size: 17px; line-height: 1.4; font-weight: 500;
  margin: 0 0 14px 0;
}
.programme-card .programme-body {
  color: var(--text-secondary);
  margin: 0;
}

/* ---------- Pédagogie --------------------------------------------- */
.pedagogie {
  position: relative;
  background:
    radial-gradient(ellipse at center, rgba(201, 168, 76, 0.08) 0%, transparent 60%),
    var(--bg-primary);
  text-align: center;
}
.pedagogie-inner { max-width: 720px; margin: 0 auto; }
.pedagogie-inner h2 { margin-bottom: 24px; }
.pedagogie-inner .body-lg {
  color: var(--text-secondary);
  margin: 0;
}
.credentials {
  display: flex; flex-wrap: wrap; justify-content: center; gap: 12px;
  margin-top: 40px;
}
.credential-pill {
  display: inline-block;
  font-size: 11px; font-weight: 700; letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--gold);
  background: var(--bg-elevated);
  border: 1px solid rgba(201, 168, 76, 0.3);
  padding: 10px 18px;
  border-radius: 999px;
}
@media (min-width: 1024px) {
  .credential-pill { font-size: 12px; padding: 12px 22px; }
}

/* ---------- Final CTA --------------------------------------------- */
.final-cta {
  background:
    radial-gradient(ellipse at center, rgba(201, 168, 76, 0.15) 0%, transparent 60%),
    var(--bg-primary);
  text-align: center;
  padding: 96px 0;
}
.final-cta h2 { margin-bottom: 32px; }
.final-cta-meta {
  margin-top: 20px;
  color: var(--text-muted);
  font-size: 14px;
}
@media (min-width: 1024px) { .final-cta { padding: 160px 0; } }

/* ---------- FAQ --------------------------------------------------- */
.faq-list {
  display: flex; flex-direction: column; gap: 12px;
  max-width: 800px; margin: 0 auto;
}
.faq-item {
  background: var(--bg-elevated);
  border-radius: var(--radius-md);
  overflow: hidden;
}
.faq-question {
  display: flex; align-items: center; justify-content: space-between;
  width: 100%; padding: 20px 24px; text-align: left;
  font-size: 17px; font-weight: 600;
  color: var(--text-primary);
  transition: background var(--transition-fast);
}
.faq-question:hover { background: rgba(255, 255, 255, 0.02); }
.faq-question svg {
  flex-shrink: 0; width: 20px; height: 20px;
  transition: transform var(--transition-med);
}
.faq-item.open .faq-question svg { transform: rotate(180deg); }
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-med);
  color: var(--text-secondary);
}
.faq-answer-inner {
  padding: 0 24px 24px;
}
.faq-item.open .faq-answer { max-height: 400px; }

/* ---------- Footer ------------------------------------------------ */
.site-footer {
  background: var(--bg-elevated);
  padding: 48px 0 24px;
}
.footer-grid {
  display: grid; grid-template-columns: 1fr;
  gap: 32px;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--border);
}
@media (min-width: 768px) {
  .footer-grid { grid-template-columns: 1fr auto; align-items: start; }
}
.footer-brand .wordmark { font-size: 22px; }
.footer-brand p {
  margin: 8px 0 0;
  color: var(--text-secondary);
  font-size: 14px;
}
.footer-contact {
  display: flex; flex-direction: column; gap: 20px;
}
@media (min-width: 768px) {
  .footer-contact { align-items: flex-end; }
}
.footer-contact a {
  color: var(--text-secondary);
  font-size: 15px;
  transition: color var(--transition-fast);
}
.footer-contact a:hover { color: var(--gold); }
.footer-social {
  display: flex !important;
  flex-direction: row !important;
  flex-wrap: nowrap !important;
  gap: 20px; align-items: center;
}
.footer-social a {
  display: inline-flex;
  flex: 0 0 auto;
  width: 36px; height: 36px;
  align-items: center; justify-content: center;
  opacity: 0.75;
  transition: opacity var(--transition-fast), transform var(--transition-fast);
}
.footer-social a:hover { opacity: 1; transform: scale(1.08); }
.footer-social img { width: 30px; height: 30px; display: block; }

.footer-legal-links {
  display: flex; flex-wrap: wrap; gap: 6px; align-items: center;
  font-size: 14px;
}
.footer-legal-links a {
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}
.footer-legal-links a:hover { color: var(--gold); }
.footer-legal-links span { color: var(--text-muted); }
@media (min-width: 768px) {
  .footer-legal-links { justify-content: flex-end; }
}

.footer-copy {
  text-align: center;
  padding-top: 24px;
  color: var(--text-muted);
  font-size: 13px;
}

/* ---------- Reveal animations ------------------------------------- */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 600ms ease, transform 600ms ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- Focus --------------------------------------------------- */
:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---------- Reduced motion ---------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  .reveal { opacity: 1; transform: none; }
}