/* ActiveLab — one stylesheet for every page.
   Brand colours live here; change them once and the whole site follows. */
:root {
  --green: #9AC483;
  --blue: #4294D5;
  --white: #fff;
  --ink: #1d2a33;
  --max: 1180px;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; font-family: Montserrat, system-ui, sans-serif; color: var(--white); background: var(--blue); line-height: 1.55; }
img { display: block; max-width: 100%; height: auto; }
a { color: inherit; }
h1, h2, h3, h4 { line-height: 1.2; margin: 0 0 .6em; font-weight: 700; }
p { margin: 0 0 1em; }

/* ---------- header ---------- */
.top { position: sticky; top: 0; z-index: 20; background: var(--white); display: flex; align-items: center; justify-content: space-between;
  padding: 18px clamp(18px, 4vw, 60px); border-bottom: 1px solid #e6e6e6; }
.logo img { height: 40px; width: auto; }
.top nav { display: flex; gap: 22px; }
.top nav a { color: var(--green); text-decoration: none; font-weight: 600; font-size: 14px; letter-spacing: .06em; text-transform: uppercase; }
.top nav a.here, .top nav a:hover { text-decoration: underline; text-underline-offset: 5px; }
.burger { display: none; }

/* ---------- buttons ---------- */
.btn { display: inline-block; background: var(--blue); color: var(--white); text-decoration: none; font-weight: 700; font-size: 13px;
  letter-spacing: .14em; text-transform: uppercase; padding: 15px 36px; transition: transform .2s, background .2s; }
.btn:hover { transform: translateY(-2px); }
.article .btn, .ghost { background: transparent; border: 2px solid var(--white); }
.article .btn:hover, .ghost:hover { background: var(--white); color: var(--blue); }

/* ---------- home: hero slideshow ---------- */
.hero { position: relative; overflow: hidden; background: var(--green); min-height: min(78vh, 720px); display: grid; place-items: center;
  transition: background-color 1s ease; }
.slides, .slide { position: absolute; inset: 0; }
.slide img { position: absolute; width: 30%; aspect-ratio: 3 / 2; object-fit: cover; object-position: 50% 35%;
  box-shadow: 0 18px 40px rgba(0,0,0,.18); opacity: 0; transition: transform .9s cubic-bezier(.7,0,.2,1), opacity .6s; }
.slide .p1 { left: 4%; top: 10%; transform: translateX(-60px) rotate(-3deg); }
.slide .p2 { right: 4%; bottom: 10%; transform: translateX(60px) rotate(3deg); }
.slide:nth-child(even) .p1 { left: auto; right: 4%; top: 10%; }
.slide:nth-child(even) .p2 { right: auto; left: 4%; bottom: 10%; }
.slide.on img { opacity: 1; transform: none; }
.hero-text { position: relative; z-index: 2; text-align: center; max-width: 380px; padding: 0 20px; }
.hero-text h1 { font-size: clamp(28px, 3.2vw, 40px); text-transform: uppercase; letter-spacing: .04em; }
.hero-text p { font-size: 17px; }
.arrow { position: absolute; z-index: 3; bottom: 24px; background: none; border: 0; color: var(--white); font-size: 26px; cursor: pointer; padding: 8px 14px; }
.prev { left: calc(50% - 60px); } .next { left: calc(50% + 10px); }
.hero-text .btn { margin-bottom: 40px; }

/* ---------- home: who is it for ---------- */
.who { background: var(--white); color: var(--green); display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center;
  max-width: var(--max); margin: 0 auto; padding: 90px clamp(20px, 5vw, 60px); }
.who h2 { font-size: 32px; }
.who li p { font-weight: 600; font-size: 17px; }
.who ul { padding-left: 1.1em; }
.fader { position: relative; aspect-ratio: 2 / 3; max-width: 420px; justify-self: center; width: 100%; }
.fader img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; opacity: 0; transition: opacity 1.2s; }
.fader img.on { opacity: 1; }
body:has(.who) { background: var(--white); }

/* ---------- home: article cards ---------- */
.articles { background: var(--green); padding: 80px clamp(20px, 5vw, 60px); }
.articles h2 { text-align: center; font-size: 30px; margin-bottom: 40px; }
.cards { max-width: var(--max); margin: 0 auto; display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 34px; }
.card { display: grid; grid-template-columns: 150px 1fr; gap: 18px; align-items: center; text-decoration: none; }
.card img { width: 150px; aspect-ratio: 3 / 4; object-fit: cover; transition: transform .4s; }
.card:hover img { transform: scale(1.03); }
.card b { display: block; font-size: 19px; margin-bottom: 4px; }
.card span { font-size: 15px; }
.sign { background: var(--blue); padding: 60px 20px 0; }
.sign img { width: 100%; max-width: 560px; margin: 0 auto; }

/* ---------- articles + exercise pages ---------- */
.article { max-width: var(--max); margin: 0 auto; padding: 70px clamp(20px, 5vw, 60px); }
.cols { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: start; }
.text h2, .text h3 { font-size: 30px; }
.text h4 { font-size: 20px; }
.text p { font-size: 17px; }
.back { display: inline-block; margin-bottom: 26px; font-weight: 700; text-decoration: none; }
.pics { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }
.pics img { width: 100%; object-fit: cover; }
.pics.n1, .pics.n2 { grid-template-columns: 1fr; max-width: 460px; }
.pics img:nth-child(even) { margin-top: 70px; }
.pics.n1 img, .pics.n2 img { margin-top: 0; }

/* exercises catalogue */
.exercises .text img { margin-top: 30px; }
.groups { columns: 2; column-gap: 40px; }
.group { break-inside: avoid; margin-bottom: 28px; }
.group h4 { font-size: 20px; }
.group p { margin: 0 0 .45em; }
.group a { color: #d9f2cc; font-weight: 600; text-underline-offset: 3px; }

/* ---------- footer ---------- */
footer { background: var(--blue); text-align: center; padding: 70px 20px 50px; }
.foot-logo { width: 300px; margin: 0 auto 30px; filter: brightness(0) invert(1); }
footer a { text-underline-offset: 3px; }
.small { font-size: 13px; }

/* ---------- phones ---------- */
@media (max-width: 800px) {
  .logo img { height: 30px; }
  .burger { display: block; width: 30px; height: 22px; position: relative; cursor: pointer; }
  .burger span, .burger::before, .burger::after { content: ""; position: absolute; left: 0; right: 0; height: 3px; background: var(--green); border-radius: 2px; }
  .burger::before { top: 0; } .burger span { top: 9.5px; } .burger::after { bottom: 0; }
  .top nav { display: none; position: absolute; top: 100%; left: 0; right: 0; background: var(--white); flex-direction: column; gap: 0; padding: 6px 0 14px;
    box-shadow: 0 10px 20px rgba(0,0,0,.08); }
  .top nav a { padding: 12px 24px; font-size: 15px; }
  #menu:checked ~ nav { display: flex; }

  .hero { min-height: 600px; place-items: start center; }
  .hero-text { margin-top: 300px; }
  .slide img { width: 56%; }
  .slide .p1, .slide:nth-child(even) .p1 { left: 6%; right: auto; top: 24px; }
  .slide .p2, .slide:nth-child(even) .p2 { right: 6%; left: auto; top: 110px; bottom: auto; }

  .who, .cols { grid-template-columns: 1fr; gap: 36px; }
  .who { padding: 60px 22px; }
  .fader { max-width: 340px; }
  .cards { grid-template-columns: 1fr; gap: 24px; }
  .card { grid-template-columns: 110px 1fr; }
  .card img { width: 110px; }
  .article { padding: 44px 22px; }
  .text h2, .text h3 { font-size: 26px; }
  .pics img:nth-child(even) { margin-top: 30px; }
  .groups { columns: 1; }
}

@media (prefers-reduced-motion: reduce) { * { transition: none !important; } }