/* Bonjour TCF — the public home page (site/index.html), after the Claude Design « Accueil » mock-up: indigo, lavender
   and mist from the Bonjour TCF system, Source Serif 4 for the headings, Source Sans 3 for the rest. Every class is
   prefixed bt- so nothing here touches styles.css; the language pill, the theme switch and only-in/only-out still come
   from there. No inline styles: the site's CSP forbids them. */

body.bt {
  --h-bg: #F5F6FC; --h-surface: #FFFFFF; --h-surface-2: #E8ECFA; --h-ink: #252B6B; --h-muted: #4A5088; --h-soft: #5B6194;
  --h-line: #DDE2F6; --h-line-strong: #C9D0EE; --h-accent: #252B6B; --h-on-accent: #FFFFFF; --h-lav: #A0AFE8;
  --h-red: #D92932; --h-err: #B3202A; --h-err-bg: #FCEAEA; --h-ok: #17633D; --h-ok-bg: #E5F4EC; --h-warn: #7A4A00; --h-warn-bg: #FFF3D6;
  --h-band: #252B6B; --h-band-ink: #FFFFFF; --h-band-sub: #DCE1F8; --h-band-card: #FFFFFF; --h-band-card-ink: #252B6B; --h-focus: #A0AFE8;
  --h-serif: "Source Serif 4", Georgia, "Times New Roman", serif;
  --h-sans: "Source Sans 3", system-ui, -apple-system, "Segoe UI", Helvetica, Arial, sans-serif;
  --h-shadow: 0 10px 28px rgba(37, 43, 107, .10);
  background: var(--h-bg); color: var(--h-ink); font-family: var(--h-sans); font-size: 18px; line-height: 1.6;
}
:root[data-theme="dark"] body.bt {
  --h-bg: #12142B; --h-surface: #1D2045; --h-surface-2: #2A2E5C; --h-ink: #E9EBFA; --h-muted: #B3B9E0; --h-soft: #B3B9E0;
  --h-line: #3A3F73; --h-line-strong: #4A5090; --h-accent: #A0AFE8; --h-on-accent: #12142B;
  --h-red: #FF6B72; --h-err: #FF8F94; --h-err-bg: #3A1A24; --h-ok: #7FDCA8; --h-ok-bg: #173A2A; --h-warn: #FFC966; --h-warn-bg: #3D2E12;
  --h-band: #1D2045; --h-band-sub: #C9D1F4; --h-band-card: #2A2E5C; --h-band-card-ink: #E9EBFA; --h-focus: #E9EBFA;
  --h-shadow: 0 10px 28px rgba(0, 0, 0, .35);
}
.bt a { color: var(--h-ink); text-underline-offset: 3px; }
.bt a:hover { color: var(--h-accent); }
.bt :focus-visible { outline: 3px solid var(--h-focus); outline-offset: 2px; border-radius: 4px; }
.bt h1, .bt h2, .bt h3 { text-wrap: balance; margin: 0; color: inherit; }
.bt p { margin: 0; }
.bt svg use { pointer-events: none; }

/* layout */
/* the column: up to 1440 px of content, the side gutters growing with the screen (16 px on a phone, 64 px on a wide
   laptop), so a large screen is not half empty */
.bt-wrap { max-width: calc(1440px + 2 * 64px); margin: 0 auto; padding-inline: 16px; box-sizing: border-box; }
@media (min-width: 720px) { .bt-wrap { padding-inline: clamp(32px, 4.5vw, 64px); } }
/* on a wide column the hero's picture may grow with it */
@media (min-width: 1440px) { .bt-hero-fig img { max-width: 620px; } .bt-hero { gap: 72px; } }
.bt-section { padding-block: 72px; }
.bt-stack { display: flex; flex-direction: column; }
.bt-gap4 { gap: 4px; } .bt-gap6 { gap: 6px; } .bt-gap8 { gap: 8px; } .bt-gap12 { gap: 12px; } .bt-gap16 { gap: 16px; } .bt-gap28 { gap: 28px; } .bt-gap32 { gap: 32px; }
.bt-grid { display: grid; gap: 20px; }
.bt-g-auto { grid-template-columns: repeat(auto-fit, minmax(min(100%, 250px), 1fr)); }
.bt-g-wide { grid-template-columns: repeat(auto-fit, minmax(min(100%, 340px), 1fr)); gap: 24px; }
.bt-split { display: flex; flex-wrap: wrap; gap: 48px; }
.bt-split > * { flex: 1 1 340px; min-width: 0; }
.bt-white { background: var(--h-surface); border-block: 1px solid var(--h-line); }

/* type */
.bt-display { font-family: var(--h-serif); font-weight: 600; font-size: clamp(34px, 5vw, 56px); line-height: 1.12; letter-spacing: -.015em; }
.bt-h1 { font-family: var(--h-serif); font-weight: 600; font-size: clamp(30px, 4vw, 44px); line-height: 1.15; letter-spacing: -.01em; }
.bt-h2 { font-family: var(--h-serif); font-weight: 600; font-size: clamp(26px, 3vw, 36px); line-height: 1.2; }
.bt-h3 { font-size: 20px; line-height: 1.4; font-weight: 600; }
.bt-h3-lg { font-size: 26px; line-height: 1.3; }
.bt-eyebrow { font-size: 13px; font-weight: 600; letter-spacing: .08em; text-transform: uppercase; color: var(--h-soft); }
.bt-lead { font-size: 20px; color: var(--h-muted); max-width: 62ch; }
.bt-muted { color: var(--h-muted); }
.bt-small { font-size: 15px; }
.bt-tnum { font-variant-numeric: tabular-nums; }

/* buttons */
.bt-btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 48px; padding: 0 22px; border-radius: 8px; font: 600 17px/1 var(--h-sans); text-decoration: none; cursor: pointer; border: 1.5px solid var(--h-accent); white-space: nowrap; transition: transform 160ms cubic-bezier(0.23, 1, 0.32, 1), background-color 150ms ease-out; }
.bt .bt-primary { background: var(--h-accent); color: var(--h-on-accent); }
.bt .bt-primary:hover { color: var(--h-on-accent); }
/* a press is felt: every button gives a little */
.bt .bt-btn:active, .bt .bt-plan-btn:active { transform: scale(0.97); }
.bt .bt-secondary { background: var(--h-surface); color: var(--h-ink); }
.bt .bt-secondary:hover { background: var(--h-surface-2); color: var(--h-ink); }
.bt-lg { min-height: 56px; font-size: 18px; padding: 0 28px; }

/* header */
.bt-header { position: sticky; top: 0; z-index: 20; background: var(--h-surface); border-bottom: 1px solid var(--h-line); }
.bt-nav { display: flex; align-items: center; gap: 24px; min-height: 72px; }
.bt-logo { display: flex; align-items: center; flex-shrink: 0; text-decoration: none; }
/* the logo is drawn on white: in the dark it keeps a small white plate */
.bt-logo img { display: block; height: 56px; width: auto; }
:root[data-theme="dark"] .bt-logo img { background: #FFFFFF; border-radius: 8px; padding: 2px 6px; }
.bt-links { display: flex; gap: 4px 22px; flex-wrap: wrap; font-weight: 600; font-size: 16px; flex: 1; }
.bt-links a { text-decoration: none; padding: 8px 0; border-bottom: 2px solid transparent; }
.bt-links a:hover { border-bottom-color: var(--h-red); color: var(--h-ink); }
.bt-actions { display: flex; align-items: center; gap: 8px; margin-left: auto; }
.bt-actions .theme-switch { color: var(--h-ink); }
.bt-login { font-weight: 600; font-size: 16px; text-decoration: none; padding: 10px 8px; }
.bt-menu { display: none; position: relative; }
.bt-menu summary { list-style: none; width: 44px; height: 44px; border-radius: 22px; display: grid; place-items: center; cursor: pointer; color: var(--h-ink); }
.bt-menu summary::-webkit-details-marker { display: none; }
.bt-menu summary svg { width: 24px; height: 24px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; }
.bt-menu nav { position: absolute; right: 0; top: 52px; width: 240px; display: flex; flex-direction: column; padding: 8px; background: var(--h-surface); border: 1px solid var(--h-line); border-radius: 8px; box-shadow: var(--h-shadow); }
.bt-menu nav a { min-height: 44px; display: flex; align-items: center; padding: 0 12px; border-radius: 6px; text-decoration: none; font-weight: 600; font-size: 16px; }
.bt-menu nav a:hover { background: var(--h-surface-2); }
@media (max-width: 1060px) {
  .bt-links, .bt-login { display: none; }
  .bt-menu { display: block; }
  .bt-nav { gap: 12px; min-height: 64px; }
  .bt-logo img { height: 44px; }
}
@media (max-width: 520px) {
  .bt-logo img { height: 36px; }
  /* the language and the theme stay; the header button goes (the hero's own button is right below) */
  :root .bt .bt-actions > .bt-btn { display: none !important; }
  .bt-actions .bt-btn { padding: 0 14px; font-size: 15px; min-height: 44px; }
}

/* hero */
.bt-hero { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 440px), 1fr)); gap: 48px; align-items: center; padding-block: 64px 56px; }
.bt-hero-copy { display: flex; flex-direction: column; gap: 22px; min-width: 0; }
.bt-pill { align-self: flex-start; display: inline-flex; align-items: center; gap: 8px; background: var(--h-surface); border: 1px solid var(--h-line); padding: 6px 12px; border-radius: 4px; font-size: 14px; font-weight: 600; }
.bt-pill i { width: 8px; height: 8px; border-radius: 4px; background: var(--h-red); }
.bt-cta-row { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; }
.bt-hero-fig { margin: 0; display: flex; justify-content: center; min-width: 0; }
.bt-hero-fig img { width: 100%; max-width: 540px; height: auto; border-radius: 16px; }

/* demo */
.bt-demo { flex-grow: 2; background: var(--h-bg); border-radius: 16px; padding: 28px; display: flex; flex-direction: column; gap: 12px; }
.bt-ans { display: flex; align-items: center; gap: 12px; min-height: 52px; border-radius: 8px; padding: 8px 16px; font-size: 16px; border: 2px solid; }
.bt-ans svg { width: 22px; height: 22px; flex-shrink: 0; fill: none; stroke: currentColor; stroke-width: 2.4; stroke-linecap: round; stroke-linejoin: round; }
.bt-ans.bad { border-color: var(--h-err); background: var(--h-err-bg); color: var(--h-err); }
.bt-ans.good { border-color: var(--h-ok); background: var(--h-ok-bg); color: var(--h-ok); }
.bt-why { background: var(--h-surface); border-radius: 8px; padding: 16px; font-size: 16px; }

/* the showcase: a real screen of the app, in a browser frame on a lavender ground, its points on the left */
/* the demonstration's section: a light blue ground across the page */
.bt-demo-band { background: #EEF1FB; border-block: 1px solid var(--h-line); }
.bt-showcase { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: clamp(32px, 5vw, 80px); align-items: center; }
.bt-shot { width: 100%; max-width: 640px; justify-self: end; }
@media (max-width: 960px) { .bt-showcase { grid-template-columns: minmax(0, 1fr); } .bt-shot { justify-self: center; } }
.bt-showcase-copy { display: flex; flex-direction: column; gap: 16px; }
.bt-showcase-list { list-style: none; margin: 8px 0 0; padding: 0; display: flex; flex-direction: column; gap: 14px; font-size: 17px; line-height: 1.5; }
.bt-showcase-list li { display: flex; gap: 12px; }
.bt-showcase-list svg { width: 22px; height: 22px; flex-shrink: 0; margin-top: 1px; padding: 4px; border-radius: 11px; border: 1.5px solid var(--h-red); fill: none; stroke: var(--h-red); stroke-width: 3; stroke-linecap: round; stroke-linejoin: round; box-sizing: border-box; }
/* the capture on the section's own blue: no plate, a thin outline and a soft shadow lift it */
.bt-shot { margin: 0; display: flex; flex-direction: column; gap: 14px; }
.bt-shot-frame { display: block; overflow: hidden; border-radius: 12px; background: #FFFFFF; border: 1px solid #C9D0EE; box-shadow: 0 1px 2px rgba(37, 43, 107, .06), 0 18px 40px rgba(37, 43, 107, .14); transition: transform 300ms cubic-bezier(0.23, 1, 0.32, 1), box-shadow 300ms cubic-bezier(0.23, 1, 0.32, 1); }
@media (hover: hover) and (pointer: fine) { .bt-shot-frame:hover { transform: translateY(-4px); box-shadow: 0 2px 4px rgba(37, 43, 107, .08), 0 26px 52px rgba(37, 43, 107, .18); } }
.bt-shot-bar { display: flex; align-items: center; gap: 6px; height: 30px; padding: 0 12px; background: #EEF0F8; border-bottom: 1px solid #DDE2F6; }
.bt-shot-bar i { width: 10px; height: 10px; border-radius: 5px; background: #C9D0EE; }
.bt-shot-bar span { margin-left: 10px; padding: 2px 12px; border-radius: 6px; background: #FFFFFF; font-size: 12px; color: #5B6194; }
.bt-shot-frame img { display: block; width: 100%; height: auto; }
.bt-shot figcaption { color: var(--h-muted); text-align: center; }
/* the switch between the two screens: two radios drawn as a segmented control (no script); one screen shows at a time */
.bt-shot-tabs { align-self: center; display: inline-flex; gap: 4px; padding: 4px; border-radius: 999px; background: #FFFFFF; border: 1px solid #C9D0EE; }
.bt-shot-tabs input { position: absolute; opacity: 0; pointer-events: none; }
.bt-shot-tabs label { min-height: 40px; display: inline-flex; align-items: center; padding: 0 16px; border-radius: 999px; font-size: 15px; font-weight: 600; color: #252B6B; cursor: pointer; transition: background-color 150ms ease-out, color 150ms ease-out; }
.bt-shot-tabs input:checked + label { background: #252B6B; color: #FFFFFF; }
.bt-shot-tabs input:focus-visible + label { outline: 3px solid var(--h-focus); outline-offset: 2px; }
.bt-shot [data-shot="ce"] { display: none; }
.bt-shot:has(#bt-shot-ce:checked) [data-shot="co"] { display: none; }
.bt-shot:has(#bt-shot-ce:checked) [data-shot="ce"] { display: block; animation: bt-fade-in 220ms ease-out; }
.bt-shot:has(#bt-shot-co:checked) .bt-shot-frame[data-shot="co"] { animation: bt-fade-in 220ms ease-out; }
@keyframes bt-fade-in { from { opacity: 0; } }

/* the four tests */
.bt-card { background: var(--h-surface); border: 1px solid var(--h-line); border-radius: 16px; padding: 24px; display: flex; flex-direction: column; gap: 10px; min-width: 0; }
.bt-card-lg { padding: 32px; }
.bt-card-link { text-decoration: none; transition: border-color 150ms ease-out; }
.bt-card-link:hover { border-color: var(--h-accent); }
.bt-ic { width: 32px; height: 32px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.bt-list { margin: 0; padding-left: 20px; color: var(--h-muted); display: flex; flex-direction: column; gap: 6px; }
.bt-list strong { color: var(--h-ink); }

/* the weekly loop */
.bt-band { background: var(--h-band); color: var(--h-band-ink); }
.bt-band .bt-eyebrow { color: var(--h-lav); }
.bt-band p { color: var(--h-band-sub); }
.bt-loop { gap: 44px; padding-bottom: 96px; }
.bt-loop-head { display: flex; flex-wrap: wrap; align-items: flex-end; gap: 24px; justify-content: space-between; }
.bt-loop-intro { max-width: 640px; }
.bt-coach { display: flex; align-items: center; gap: 12px; background: rgba(255, 255, 255, .08); border: 1px solid rgba(160, 175, 232, .35); border-radius: 16px; padding: 12px 18px 12px 12px; max-width: 340px; }
.bt-coach img { width: 64px; height: 64px; object-fit: contain; object-position: bottom; border-radius: 32px; background: #E8ECFA; flex-shrink: 0; }
.bt-coach span { font-size: 15px; line-height: 1.45; color: var(--h-band-ink); }
.bt-steps { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 250px), 1fr)); gap: 24px; }
.bt-step { display: flex; flex-direction: column; gap: 16px; min-width: 0; }
.bt-step-rail { display: flex; align-items: center; gap: 10px; }
.bt-step-num { width: 44px; height: 44px; border-radius: 22px; background: var(--h-band-card); color: var(--h-band-card-ink); font-weight: 700; display: flex; align-items: center; justify-content: center; flex-shrink: 0; }
.bt-step:last-child .bt-step-num { background: var(--h-red); color: #FFFFFF; }
.bt-dash { flex: 1; border-top: 2px dashed var(--h-lav); }
.bt-step h3 { font-size: 22px; }
.bt-when { font-size: 13px; font-weight: 600; color: var(--h-lav); text-transform: uppercase; letter-spacing: .06em; }
.bt-vignette { background: var(--h-band-card); color: var(--h-band-card-ink); border-radius: 14px; padding: 16px; display: flex; flex-direction: column; gap: 10px; box-shadow: 0 10px 24px rgba(0, 0, 0, .2); font-size: 14px; transition: transform 250ms cubic-bezier(0.23, 1, 0.32, 1); }
.bt-band .bt-vignette p { color: inherit; }
.bt-step:nth-child(1) .bt-vignette { transform: rotate(-1.5deg); }
.bt-step:nth-child(2) .bt-vignette { transform: rotate(1deg); }
.bt-step:nth-child(3) .bt-vignette { transform: rotate(-1deg); }
.bt-step:nth-child(4) .bt-vignette { transform: rotate(1.5deg); }
@media (hover: hover) and (pointer: fine) { .bt-step:hover .bt-vignette { transform: rotate(0) translateY(-4px); } }
.bt-vrow { display: flex; justify-content: space-between; align-items: center; gap: 8px; }
.bt-vhead { font-size: 12px; font-weight: 600; opacity: .8; }
.bt-strong { font-weight: 600; }
.bt-dim { opacity: .8; }
.bt-timer { font-size: 18px; }
.bt-vtext { font-size: 15px; line-height: 1.7; }
.bt-mark { border-bottom: 3px solid var(--h-red); }
.bt-vnote { background: var(--h-surface-2); border-radius: 8px; padding: 10px; font-size: 13px; line-height: 1.5; }
.bt-bars { display: grid; grid-template-columns: 28px 1fr 18px; gap: 6px 8px; align-items: center; font-weight: 700; font-size: 13px; }
.bt-bar { position: relative; height: 8px; border-radius: 4px; background: var(--h-surface-2); }
.bt-bar b { position: absolute; inset: 0 auto 0 0; border-radius: 4px; background: var(--h-accent); }
.bt-bar i { position: absolute; left: 83%; top: -3px; width: 2px; height: 14px; background: var(--h-red); }
.bt-bar-thin { height: 6px; }
.bt-bar .w46 { width: 46%; } .bt-bar .w55 { width: 55%; } .bt-bar .w60 { width: 60%; } .bt-bar .w64 { width: 64%; } .bt-bar .w73 { width: 73%; }
.bt-seg { display: grid; grid-template-columns: 1fr 1fr; background: var(--h-surface-2); border-radius: 8px; padding: 3px; text-align: center; font-weight: 600; font-size: 13px; }
.bt-seg span { padding: 6px; }
.bt-seg .on { background: var(--h-accent); color: var(--h-on-accent); border-radius: 6px; }
.bt-chip { font-weight: 700; font-size: 12px; padding: 1px 6px; border-radius: 4px; }
.bt-chip.bad { background: var(--h-err-bg); color: var(--h-err); }
.bt-chip.mid { background: var(--h-warn-bg); color: var(--h-warn); }
.bt-chip.good { background: var(--h-ok-bg); color: var(--h-ok); }
.bt-chip-accent { align-self: flex-start; background: var(--h-accent); color: var(--h-on-accent); }
.bt-loop-back { position: relative; height: 48px; margin: 0 22px; border: 2px dashed var(--h-lav); border-top: 0; border-radius: 0 0 28px 28px; }
.bt-band .bt-loop-label { position: relative; margin: -62px auto 0; background: var(--h-band); padding: 0 16px; display: flex; align-items: center; gap: 8px; font-size: 16px; font-weight: 600; color: var(--h-band-ink); }
.bt-loop-label svg { width: 18px; height: 18px; flex-shrink: 0; fill: none; stroke: currentColor; stroke-width: 2.4; stroke-linecap: round; stroke-linejoin: round; }
@media (max-width: 560px) { .bt-band .bt-loop-label { text-align: center; max-width: 80%; } }

/* the candidates' results: the three certificates whole, side by side, as sheets laid on the page (a slight tilt
   each); under a real pointer a sheet straightens and comes forward. A click opens it full size. */
.bt-results-head { max-width: 760px; }
.bt-results { width: 100%; max-width: 1040px; margin-inline: auto; box-sizing: border-box; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: clamp(20px, 3vw, 40px); padding: 12px clamp(8px, 3vw, 48px) 20px; }
@media (max-width: 860px) { .bt-results { grid-template-columns: minmax(0, 420px); justify-content: center; gap: 28px; } }
.bt-result { margin: 0; }
.bt-result-doc { display: block; border-radius: 6px; background: #FFFFFF; box-shadow: 0 1px 2px rgba(37, 43, 107, .08), 0 14px 32px rgba(37, 43, 107, .14); transition: transform 300ms cubic-bezier(0.23, 1, 0.32, 1), box-shadow 300ms cubic-bezier(0.23, 1, 0.32, 1); }
.bt-result-doc img { display: block; width: 100%; height: auto; border-radius: 6px; }
.bt-result:nth-child(1) .bt-result-doc { transform: rotate(-1.6deg); }
.bt-result:nth-child(2) .bt-result-doc { transform: translateY(-10px); }
.bt-result:nth-child(3) .bt-result-doc { transform: rotate(1.6deg); }
@media (hover: hover) and (pointer: fine) {
  .bt-result .bt-result-doc:hover { transform: rotate(0) translateY(-14px) scale(1.02); box-shadow: 0 2px 4px rgba(37, 43, 107, .08), 0 26px 48px rgba(37, 43, 107, .2); }
}
.bt-result-doc:active { transform: rotate(0) scale(0.99); }
@media (max-width: 860px) { .bt-result:nth-child(n) .bt-result-doc { transform: none; } }
@media (prefers-reduced-motion: reduce) { .bt-result .bt-result-doc, .bt-result .bt-result-doc:hover { transform: none; transition: none; } }
.bt-results-note { max-width: 760px; }

/* the reviews: the centre's average with its stars, a word, and the way to Trustpilot */
.bt-reviews { display: flex; flex-wrap: wrap; align-items: center; gap: 24px 40px; padding: 28px 32px; border-radius: 16px; background: var(--h-surface-2); }
.bt-reviews-score { display: flex; flex-direction: column; gap: 6px; flex: 0 0 auto; }
.bt-reviews-n { font-size: 48px; font-weight: 700; line-height: 1; }
.bt-reviews-n span { font-size: 20px; font-weight: 600; color: var(--h-muted); margin-left: 2px; }
.bt-stars { display: inline-flex; gap: 3px; color: #D92932; }
.bt-stars svg { width: 22px; height: 22px; fill: currentColor; }
.bt-star-half { display: inline-flex; width: 11px; overflow: hidden; }
.bt-star-half svg { flex: none; }
.bt-reviews-text { flex: 1 1 320px; display: flex; flex-direction: column; gap: 6px; }
.bt .bt-trust { gap: 10px; background: var(--h-surface); color: var(--h-ink); }
.bt .bt-trust:hover { background: #FFFFFF; color: var(--h-ink); }
.bt-trust svg { width: 18px; height: 18px; fill: #00B67A; }

/* plans: three cards in the page's own style; lifetime in the middle, red with indigo, a little taller */
/* three upright cards, centred: on a wide screen each card stays taller than it is wide (never a square) */
.bt-pricing { align-items: center; }
.bt-pricing-head { align-items: center; text-align: center; max-width: 680px; }
.bt-plans { width: 100%; max-width: 1060px; display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 290px), 1fr)); gap: 24px; align-items: stretch; padding-block: 12px; }
.bt-plan { min-height: 480px; display: flex; flex-direction: column; gap: 6px; padding: 32px 28px 28px; border-radius: 16px; background: var(--h-surface); border: 1px solid var(--h-line-strong); }
.bt-plan-top { display: flex; align-items: center; justify-content: space-between; gap: 8px; }
.bt-plan-name { font-size: 20px; font-weight: 600; }
.bt-plan-for { font-size: 15px; color: var(--h-muted); }
.bt-plan-price { display: flex; align-items: baseline; gap: 6px; margin: 14px 0 12px; }
.bt-plan-price span { font-size: 46px; font-weight: 700; line-height: 1.1; }
.bt-plan-price small { font-size: 15px; color: var(--h-muted); }
.bt-plan-list { list-style: none; margin: 0 0 20px; padding: 0; display: flex; flex-direction: column; gap: 10px; font-size: 16px; line-height: 1.45; }
.bt-plan-list li { display: flex; gap: 10px; }
.bt-plan-list svg { width: 18px; height: 18px; flex-shrink: 0; margin-top: 3px; fill: none; stroke: var(--h-ok); stroke-width: 2.6; stroke-linecap: round; stroke-linejoin: round; }
.bt .bt-plan-btn { margin-top: auto; min-height: 48px; display: flex; align-items: center; justify-content: center; border-radius: 8px; border: 1.5px solid var(--h-accent); background: var(--h-surface); color: var(--h-ink); font-weight: 600; font-size: 17px; text-decoration: none; transition: background-color 150ms ease-out, transform 160ms cubic-bezier(0.23, 1, 0.32, 1); }
.bt .bt-plan-btn:hover { background: var(--h-surface-2); color: var(--h-ink); }
/* the lifetime pass: white with red — a red frame and band, the price, the badge, the checks and the button in red */
.bt-plan.main { --red: #D92932; position: relative; overflow: hidden; margin-block: -12px; padding: 44px 28px 32px; background: #FFFFFF; color: #252B6B; border: 2px solid var(--red); box-shadow: 0 16px 36px rgba(217, 41, 50, .16); }
.bt-plan.main::before { content: ""; position: absolute; inset: 0 0 auto; height: 10px; background: var(--red); }
.bt-plan.main .bt-plan-for, .bt-plan.main .bt-plan-price small { color: #4A5088; }
.bt-plan.main .bt-plan-price span { color: var(--red); }
.bt-plan-badge { flex-shrink: 0; padding: 3px 10px; border-radius: 4px; background: #D92932; color: #FFFFFF; font-size: 13px; font-weight: 700; }
.bt-plan.main .bt-plan-list svg { padding: 3px; border-radius: 10px; background: var(--red); stroke: #FFFFFF; stroke-width: 3; width: 20px; height: 20px; margin-top: 2px; box-sizing: border-box; }
.bt .bt-plan.main .bt-plan-btn { background: var(--red); border-color: var(--red); color: #FFFFFF; }
.bt .bt-plan.main .bt-plan-btn:hover { background: #B3202A; border-color: #B3202A; color: #FFFFFF; }
:root[data-theme="dark"] .bt-plan.main { background: #1D2045; color: #E9EBFA; --red: #E0363F; }
:root[data-theme="dark"] .bt-plan.main .bt-plan-for, :root[data-theme="dark"] .bt-plan.main .bt-plan-price small { color: #B3B9E0; }
:root[data-theme="dark"] .bt-plan.main .bt-plan-price span { color: #FF6B72; }

/* faq */
.bt-faq-wrap { display: grid; grid-template-columns: minmax(0, 1fr); gap: 24px; }
@media (min-width: 900px) { .bt-faq-wrap { grid-template-columns: minmax(0, 1fr) minmax(0, 2fr); gap: 48px; } }
.bt-faq { background: var(--h-surface); border: 1px solid var(--h-line); border-radius: 8px; padding: 14px 20px; }
.bt-faq summary { font-weight: 600; cursor: pointer; min-height: 28px; }
.bt-faq p { margin-top: 8px; color: var(--h-muted); font-size: 16px; }

/* last call */
.bt-last { padding-bottom: 72px; }
.bt-final { background: var(--h-surface-2); border: 0; padding: 40px; flex-direction: row; flex-wrap: wrap; align-items: center; gap: 24px; }
.bt-final img { width: 140px; height: auto; }
.bt-final-text { flex: 1 1 320px; }

/* footer */
.bt-footer { background: #252B6B; color: #DCE1F8; }
.bt-footer a { color: #DCE1F8; }
.bt-footer a:hover { color: #FFFFFF; }
.bt-foot { display: flex; flex-wrap: wrap; gap: 20px 48px; padding-block: 48px; }
.bt-foot nav { display: flex; flex-wrap: wrap; gap: 10px 28px; font-size: 15px; }
.bt-legal { flex-basis: 100%; font-size: 14px; color: #C9D1F4; max-width: 820px; border-top: 1px solid rgba(160, 175, 232, .3); padding-top: 20px; }

@media (prefers-reduced-motion: reduce) {
  .bt-btn, .bt-vignette, .bt-card-link { transition: none; }
  .bt-step:hover .bt-vignette { transform: none; }
  .bt .bt-btn:active, .bt .bt-plan-btn:active { transform: none; }
}

.bt-pricing > p { text-align: center; }

/* ---------- what is inside, in numbers: one row of six under the hero ---------- */
.bt-kpis-wrap { display: flex; flex-direction: column; gap: 16px; padding-block: 8px 56px; }
h2.bt-eyebrow { font-family: var(--h-sans); font-size: 13px; line-height: 1.4; }
.bt-kpis { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(6, minmax(0, 1fr)); background: var(--h-surface); border: 1px solid var(--h-line); border-radius: 20px; box-shadow: var(--h-shadow); }
.bt-kpi { display: flex; flex-direction: column; gap: 4px; padding: 24px 22px; min-width: 0; }
.bt-kpi + .bt-kpi { border-left: 1px solid var(--h-line); }
.bt-kpi-n { font-family: var(--h-serif); font-weight: 600; font-size: clamp(30px, 2.8vw, 40px); line-height: 1.05; color: var(--h-ink); white-space: nowrap; }
.bt-kpi:first-child .bt-kpi-n { color: var(--h-red); }
.bt-kpi-l { font-weight: 700; font-size: 15px; line-height: 1.3; color: var(--h-ink); }
.bt-kpi-s { font-size: 13.5px; line-height: 1.4; color: var(--h-muted); }
@media (max-width: 1100px) {
  .bt-kpis { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .bt-kpi + .bt-kpi { border-left: 0; }
  .bt-kpi:nth-child(3n + 2), .bt-kpi:nth-child(3n + 3) { border-left: 1px solid var(--h-line); }
  .bt-kpi:nth-child(n + 4) { border-top: 1px solid var(--h-line); }
}
@media (max-width: 620px) {
  .bt-kpis { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .bt-kpi { padding: 18px 16px; }
  .bt-kpi:nth-child(n) { border-left: 0; border-top: 0; }
  .bt-kpi:nth-child(even) { border-left: 1px solid var(--h-line); }
  .bt-kpi:nth-child(n + 3) { border-top: 1px solid var(--h-line); }
}

/* the four tests: what each one holds */
.bt-ep-n { margin-top: auto; padding-top: 10px; border-top: 1px solid var(--h-line); font-size: 14px; font-weight: 700; color: var(--h-ink); }

/* ---------- the ideas library and the method, each with a preview drawn as in the app ---------- */
#epreuves + #idees { padding-top: 8px; }
.bt-expr-head { max-width: 760px; }
.bt-expr-card { gap: 16px; }
.bt-expr-top { display: flex; align-items: center; gap: 14px; }
.bt-expr-ic { flex: none; width: 48px; height: 48px; border-radius: 24px; display: grid; place-items: center; background: var(--h-surface-2); color: var(--h-ink); }
.bt-expr-ic svg { width: 24px; height: 24px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.bt-mock { margin-top: auto; display: flex; flex-direction: column; gap: 10px; transform: none; text-align: left; background: var(--h-bg); color: var(--h-ink); border: 1px solid var(--h-line); box-shadow: none; }
.bt-mock svg { fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.bt-mock-theme { display: flex; align-items: center; gap: 10px; }
.bt-mock-badge { width: 30px; height: 30px; border-radius: 15px; display: grid; place-items: center; background: var(--h-surface-2); color: var(--h-ink); }
.bt-mock-badge svg { width: 16px; height: 16px; }
.bt-mock-caps { font-size: 11.5px; font-weight: 700; letter-spacing: .06em; text-transform: uppercase; color: var(--h-soft); }
.bt-mock-tag { padding: 3px 8px; border-radius: 6px; background: var(--h-ink); color: var(--h-on-accent); font-size: 12px; font-weight: 700; }
.bt-mock-title { font-size: 16px; line-height: 1.3; color: var(--h-ink); }
.bt-mock-cols { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; }
@media (max-width: 520px) { .bt-mock-cols { grid-template-columns: minmax(0, 1fr); } }
.bt-mock-col { display: flex; flex-direction: column; gap: 6px; padding: 10px 12px; border-radius: 10px; background: var(--h-surface); border: 1px solid var(--h-line); font-size: 13.5px; line-height: 1.35; color: var(--h-ink); }
.bt-mock-col b { display: inline-flex; align-items: center; gap: 6px; font-size: 13px; }
.bt-mock-col b svg { width: 14px; height: 14px; }
.bt-mock-col.good { border-top: 3px solid var(--h-ok); }
.bt-mock-col.good b { color: var(--h-ok); }
.bt-mock-col.bad { border-top: 3px solid var(--h-err); }
.bt-mock-col.bad b { color: var(--h-err); }
.bt-mock-part { display: grid; grid-template-columns: 74px minmax(0, 1fr); gap: 10px; padding: 4px 0 4px 10px; border-left: 4px solid var(--h-lav); }
@media (max-width: 520px) { .bt-mock-part { grid-template-columns: minmax(0, 1fr); gap: 2px; } }
.bt-mock-part.navy { border-left-color: var(--h-ink); }
.bt-mock-part i { font-style: normal; font-size: 10.5px; font-weight: 700; letter-spacing: .05em; text-transform: uppercase; color: var(--h-soft); padding-top: 2px; }
.bt-mock-part p { margin: 0; font-family: var(--h-sans); font-weight: 400; font-size: 14.5px; line-height: 1.5; color: var(--h-ink); }
.bt-mock-part u { font-weight: 600; text-decoration-color: var(--h-red); text-decoration-thickness: 2px; text-underline-offset: 3px; }

/* ---------- the AI Coach at work: a writing correction and the speaking examiner ---------- */
.bt-ai .bt-expr-ic svg { width: 24px; height: 24px; }
.bt-ai-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 8px; }
.bt-ai-list li { display: flex; gap: 10px; align-items: flex-start; line-height: 1.45; }
.bt-ai-list svg { flex: none; width: 20px; height: 20px; margin-top: 1px; fill: none; stroke: var(--h-ok); stroke-width: 2.4; stroke-linecap: round; stroke-linejoin: round; }
/* the writing room filmed while a task 2 is typed (an animated WebP from the app); still for reduced motion */
.bt-ai-write { margin: 0; display: flex; flex-direction: column; gap: 8px; }
.bt-ai-write img { display: block; width: 100%; height: auto; border-radius: 14px; border: 1px solid var(--h-line); box-shadow: 0 10px 26px rgba(37, 43, 107, .12); background: #f5f6fa; }
.bt-ai-write figcaption { font-size: 13.5px; line-height: 1.45; color: var(--h-muted); }
.bt-ai-call { align-items: center; justify-content: center; gap: 14px; padding: 20px; flex: 1 1 auto; } /* fills the card down to the writing card's height */
.bt-ai-face { position: relative; margin: 0; width: min(100%, 300px); }
.bt-ai-face img { display: block; width: 100%; height: auto; border-radius: 16px; box-shadow: 0 12px 30px rgba(37, 43, 107, .16); }
.bt-ai-live { position: absolute; left: 50%; bottom: -12px; transform: translateX(-50%); display: inline-flex; align-items: center; gap: 6px; padding: 4px 12px; border-radius: 999px; background: var(--h-ink); color: #FFFFFF; font-size: 12.5px; font-weight: 600; white-space: nowrap; }
:root[data-theme="dark"] .bt-ai-live { background: #252B6B; }
.bt-ai-live i { width: 7px; height: 7px; border-radius: 50%; background: #4ADE80; }
.bt-ai-bubble { position: relative; margin: 14px 0 0; padding: 12px 16px; max-width: 340px; border-radius: 14px; background: var(--h-surface); border: 1px solid var(--h-line); font-size: 15px; line-height: 1.45; color: var(--h-ink); text-align: center; }

/* the Coach's conditions, in one line under its two panels */
.bt-ai-terms { display: flex; align-items: flex-start; gap: 10px; margin: 0; padding: 14px 18px; border-radius: 12px; background: var(--h-surface-2); color: var(--h-muted); font-size: 14.5px; line-height: 1.5; }
.bt-ai-terms svg { flex: none; width: 18px; height: 18px; margin-top: 2px; fill: none; stroke: var(--h-ink); stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.bt-ai-terms a { color: var(--h-ink); font-weight: 600; }

/* ---------- motion (Emil Kowalski's rules: a purpose for each, ease-out, transform and opacity only) ----------
   Marketing may take a little longer than the app's 150–250 ms; nothing loops, nothing waits on the user — save the
   writing room's film (.bt-ai-write), which repeats with a long pause and stays still under reduced motion. */
:root { --bt-ease: cubic-bezier(0.23, 1, 0.32, 1); }

/* the hero arrives once, in order: the pill, the title, the lead, the buttons, the picture */
.bt-hero-copy > *, .bt-hero-fig { animation: bt-rise 600ms var(--bt-ease) both; }
.bt-hero-copy > :nth-child(2) { animation-delay: 60ms; }
.bt-hero-copy > :nth-child(3) { animation-delay: 120ms; }
.bt-hero-copy > :nth-child(4) { animation-delay: 180ms; }
.bt-hero-copy > :nth-child(5) { animation-delay: 240ms; }
.bt-hero-fig { animation-name: bt-rise-scale; animation-delay: 160ms; }
@keyframes bt-rise { from { opacity: 0; transform: translateY(14px); } }
@keyframes bt-rise-scale { from { opacity: 0; transform: translateY(18px) scale(0.97); } }

/* the rest comes in as it scrolls into view (site.js marks it; without script, everything simply shows) */
.bt-motion [data-reveal] { opacity: 0; transform: translateY(20px); transition: opacity 500ms var(--bt-ease), transform 650ms var(--bt-ease); }
.bt-motion [data-reveal].is-in { opacity: 1; transform: none; }
/* the tilted step cards keep their tilt once in */
.bt-motion .bt-step[data-reveal].is-in .bt-vignette { transition-delay: 0ms; }

/* the header settles a shadow under it once the page moves */
.bt-header { transition: box-shadow 200ms ease-out; }
.bt-header.is-scrolled { box-shadow: 0 6px 20px rgba(37, 43, 107, .08); }

/* cards that open somewhere lift a little under a real pointer */
.bt-plan { transition: transform 220ms var(--bt-ease), box-shadow 220ms var(--bt-ease), opacity 500ms var(--bt-ease); }
@media (hover: hover) and (pointer: fine) {
  .bt-plan:hover { transform: translateY(-6px); box-shadow: 0 18px 40px rgba(37, 43, 107, .12); }
  .bt-card-link { transition: border-color 150ms ease-out, transform 220ms var(--bt-ease); }
  .bt-card-link:hover { transform: translateY(-4px); }
  .bt-card-link:hover .bt-ic { transform: scale(1.08); }
}
.bt-ic { transition: transform 220ms var(--bt-ease); }
/* once a card is in, its hover answers at hover speed, not at the arrival's */
.bt-motion .bt-plan[data-reveal].is-in, .bt-motion .bt-card-link[data-reveal].is-in { transition: opacity 500ms var(--bt-ease), transform 220ms var(--bt-ease), box-shadow 220ms var(--bt-ease), border-color 150ms ease-out; }

/* a FAQ answer fades in under its question */
.bt-faq[open] p { animation: bt-rise 260ms var(--bt-ease); }
.bt-faq summary { transition: color 150ms ease-out; }
.bt-faq summary:hover { color: var(--h-accent); }

/* the demo's correct answer draws the eye once it is on screen */
.bt-motion .bt-demo.is-in .bt-ans.good { animation: bt-pop 420ms var(--bt-ease) 450ms both; }
@keyframes bt-pop { from { opacity: 0; transform: scale(0.97); } }

@media (prefers-reduced-motion: reduce) {
  /* fewer and gentler, not none: things still fade in, nothing travels */
  .bt-hero-copy > *, .bt-hero-fig, .bt-faq[open] p, .bt-motion .bt-demo.is-in .bt-ans.good { animation: bt-fade 200ms ease-out both; animation-delay: 0ms; }
  @keyframes bt-fade { from { opacity: 0; } }
  .bt-motion [data-reveal] { transform: none; transition: opacity 200ms ease-out; }
  .bt-plan:hover, .bt-card-link:hover, .bt-card-link:hover .bt-ic { transform: none; }
}

/* printed or saved as PDF: everything shows, nothing waits for a scroll */
@media print { .bt-motion [data-reveal] { opacity: 1; transform: none; transition: none; } }