/* Layout: worksheet-paper cards on a soft classroom-blue ground; one coral action colour, sunshine for highlights. */
:root {
  --ink: #1F3A5F;
  --ink-soft: #4A5D73;
  --paper: #FFFFFF;
  --ground: #F2F6FA;
  --line: #D9E2EA;
  --coral: #C9441C;
  --coral-hover: #A83714;
  --teal: #1F8577;
  --sun: #FFD166;
  --sun-soft: #FFF3CC;
  --display: 'Fredoka', 'Baloo 2', 'Trebuchet MS', system-ui, sans-serif;
  --body: 'Andika', 'Segoe UI', system-ui, -apple-system, sans-serif;
  --r: 18px;
  color-scheme: light;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } * { transition: none !important; animation: none !important; } }
body { margin: 0; background: var(--ground); color: var(--ink); font-family: var(--body); font-size: 17px; line-height: 1.6; }
img { max-width: 100%; height: auto; display: block; }
a { color: var(--coral); }
a:hover { color: var(--coral-hover); }
:focus-visible { outline: 3px solid var(--teal); outline-offset: 3px; border-radius: 6px; }
h1, h2, h3 { font-family: var(--display); font-weight: 600; line-height: 1.15; text-wrap: balance; margin: 0; }
p { margin: 0; }
.wrap { width: 100%; max-width: 1160px; margin: 0 auto; padding-left: max(18px, env(safe-area-inset-left, 0px)); padding-right: max(18px, env(safe-area-inset-right, 0px)); }
.skip { position: absolute; left: -999px; top: 8px; background: var(--paper); padding: 8px 14px; border-radius: 8px; z-index: 20; }
.skip:focus { left: 12px; }
.muted { color: var(--ink-soft); }
.eyebrow { font-size: 13px; font-weight: 700; letter-spacing: .12em; text-transform: uppercase; color: var(--teal); }
.eyebrow.light { color: var(--sun); }
.sec-h { font-size: clamp(24px, 3vw, 32px); }

/* header */
.site-head { background: var(--paper); border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 10; }
.head-row { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding-block: 12px; flex-wrap: wrap; }
.brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; color: var(--ink); }
.brand:hover { color: var(--ink); }
.logo-mark { width: 40px; height: 40px; color: var(--ink); flex-shrink: 0; }
.brand-name { font-family: var(--display); font-weight: 700; font-size: 24px; letter-spacing: -.01em; }
.brand-name em { font-style: normal; color: var(--coral); }
.nav { display: flex; gap: 6px; flex-wrap: wrap; }
.nav a { text-decoration: none; color: var(--ink); font-weight: 700; font-size: 15px; padding: 8px 12px; border-radius: 999px; }
.nav a:hover { background: var(--ground); color: var(--ink); }

/* buttons */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; font-family: var(--display); font-weight: 600; font-size: 18px; text-decoration: none; padding: 13px 24px; border-radius: 999px; border: 2.5px solid transparent; min-height: 48px; transition: transform .15s ease, background .15s ease; }
.btn:hover { transform: translateY(-1px); }
.btn-coral { background: var(--coral); color: #fff; }
.btn-coral:hover { background: var(--coral-hover); color: #fff; }
.btn-ghost { border-color: var(--ink); color: var(--ink); background: var(--paper); }
.btn-ghost:hover { background: var(--sun-soft); color: var(--ink); }
.btn-sun { background: var(--sun); color: var(--ink); }
.btn-sun:hover { background: #FFC53D; color: var(--ink); }
.btn-big { font-size: 21px; padding: 16px 32px; width: 100%; max-width: 380px; }

/* hero */
.hero { background: var(--paper); border-bottom: 1px solid var(--line); overflow: hidden; }
.hero-row { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr); gap: 40px; align-items: center; padding-block: 56px 64px; }
.hero-copy { display: flex; flex-direction: column; gap: 18px; min-width: 0; }
.hero h1 { font-size: clamp(38px, 5.4vw, 64px); font-weight: 700; letter-spacing: -.02em; }
.hl { background: linear-gradient(transparent 62%, var(--sun) 62%); padding: 0 4px; }
.lead { font-size: 19px; color: var(--ink-soft); max-width: 34em; }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; }
.hero-facts { list-style: none; display: flex; gap: 22px; padding: 0; margin: 4px 0 0; flex-wrap: wrap; color: var(--ink-soft); font-size: 15px; }
.hero-facts b { font-family: var(--display); color: var(--ink); font-size: 20px; margin-right: 4px; }
.hero-stack { position: relative; height: 440px; }
.hero-stack img { position: absolute; width: 58%; border-radius: 6px; box-shadow: 0 14px 34px rgba(31, 58, 95, .18); border: 1px solid var(--line); background: #fff; }
.hero-stack img:nth-child(1) { left: 0; top: 40px; transform: rotate(-7deg); }
.hero-stack img:nth-child(2) { left: 21%; top: 6px; transform: rotate(2deg); z-index: 2; }
.hero-stack img:nth-child(3) { right: 0; top: 56px; transform: rotate(8deg); }

/* how */
.how { padding-block: 48px; }
.how-steps { list-style: none; padding: 0; margin: 22px 0 0; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }
.how-steps li { background: var(--paper); border: 1px solid var(--line); border-radius: var(--r); padding: 22px; display: flex; flex-direction: column; gap: 8px; }
.step-n { width: 40px; height: 40px; border-radius: 50%; background: var(--sun); display: inline-flex; align-items: center; justify-content: center; font-family: var(--display); font-weight: 700; font-size: 20px; }
.how-steps h3 { font-size: 21px; }
.how-steps p { color: var(--ink-soft); }

/* catalogue */
.catalog { padding-block: 8px 56px; }
.cat-head { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.chips { display: flex; gap: 10px; flex-wrap: wrap; margin: 18px 0 26px; }
.chip { font: 700 15px var(--body); color: var(--ink); background: var(--paper); border: 2px solid var(--line); border-radius: 999px; padding: 9px 16px; cursor: pointer; min-height: 44px; scroll-margin-top: 90px; }
.chip span { color: var(--ink-soft); font-weight: 400; margin-left: 4px; }
.chip:hover { border-color: var(--ink); }
.chip.is-on { background: var(--ink); border-color: var(--ink); color: #fff; }
.chip.is-on span { color: #D4DEE8; }
.ws-grid { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(210px, 1fr)); gap: 20px; }
.ws-card a { display: flex; flex-direction: column; height: 100%; text-decoration: none; color: var(--ink); background: var(--paper); border: 1px solid var(--line); border-radius: var(--r); overflow: hidden; transition: transform .15s ease, box-shadow .15s ease; }
.ws-card a:hover { transform: translateY(-3px); box-shadow: 0 12px 26px rgba(31, 58, 95, .14); color: var(--ink); }
.ws-thumb { display: block; background: var(--ground); padding: 14px 14px 0; border-bottom: 1px solid var(--line); }
.ws-thumb img { width: 100%; aspect-ratio: 600 / 849; object-fit: cover; object-position: top; border-radius: 4px 4px 0 0; box-shadow: 0 -1px 6px rgba(31, 58, 95, .08); max-height: 230px; }
.ws-meta { display: flex; flex-direction: column; gap: 6px; padding: 14px 16px 16px; flex: 1; }
.ws-kind { font-size: 12px; font-weight: 700; letter-spacing: .06em; text-transform: uppercase; color: var(--teal); }
.ws-title { font-family: var(--display); font-weight: 600; font-size: 18px; line-height: 1.25; }
.ws-free { margin-top: auto; align-self: flex-start; font-size: 13px; font-weight: 700; background: var(--sun-soft); padding: 3px 10px; border-radius: 999px; }
.ws-grid.small { grid-template-columns: repeat(4, minmax(0, 1fr)); }

/* bundle band */
.bundle-band { background: var(--ink); color: #fff; }
.bundle-row { display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(0, .8fr); gap: 40px; align-items: center; padding-block: 52px; }
.bundle-copy { display: flex; flex-direction: column; gap: 14px; align-items: flex-start; }
.bundle-copy h2 { font-size: clamp(28px, 3.6vw, 40px); }
.bundle-copy p { color: #D4DEE8; max-width: 36em; }
.bundle-img { border-radius: 10px; transform: rotate(2deg); box-shadow: 0 18px 40px rgba(0, 0, 0, .3); max-height: 380px; width: auto; justify-self: center; }

/* worksheet page */
.crumbs { padding-block: 18px 6px; font-size: 15px; color: var(--ink-soft); }
.crumbs a { color: var(--ink-soft); }
.ws-page { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 44px; align-items: start; padding-block: 14px 52px; }
.ws-preview { background: var(--paper); border: 1px solid var(--line); border-radius: var(--r); padding: 20px; }
.ws-preview img { box-shadow: 0 6px 22px rgba(31, 58, 95, .14); border-radius: 3px; }
.ws-info { display: flex; flex-direction: column; gap: 16px; min-width: 0; position: sticky; top: 92px; }
.ws-info h1 { font-size: clamp(30px, 3.8vw, 44px); }
.file-note { font-size: 14px; color: var(--ink-soft); margin-top: -6px; }
.info-box { background: var(--paper); border: 1px solid var(--line); border-radius: var(--r); padding: 18px 20px; display: flex; flex-direction: column; gap: 8px; }
.info-box h2 { font-size: 19px; }
.info-box.tip { background: var(--sun-soft); border-color: #F5DE96; }
.ticks { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 6px; }
.ticks li { padding-left: 30px; position: relative; }
.ticks li::before { content: ""; position: absolute; left: 0; top: 4px; width: 20px; height: 20px; border-radius: 50%; background: var(--teal) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20'%3E%3Cpath d='M5 10.5l3 3 7-7' fill='none' stroke='white' stroke-width='2.4' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center / 100% no-repeat; }
.related { padding-block: 0 56px; }
.related .sec-h { margin-bottom: 20px; }

/* practice book */
.pb { display: grid; grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr); gap: 44px; align-items: start; padding-block: 40px 60px; }
.pb-media img { border-radius: 10px; box-shadow: 0 14px 34px rgba(31, 58, 95, .18); }
.pb-info { display: flex; flex-direction: column; gap: 16px; min-width: 0; }
.pb-info h1 { font-size: clamp(32px, 4vw, 48px); }
.price-row { display: flex; align-items: baseline; gap: 14px; flex-wrap: wrap; }
.price { font-family: var(--display); font-weight: 700; font-size: 44px; color: var(--ink); }

/* prose pages */
.prose { max-width: 760px; padding-block: 48px 64px; display: flex; flex-direction: column; gap: 16px; }
.prose h1 { font-size: clamp(32px, 4vw, 46px); }
.prose h2 { font-size: 22px; margin-top: 10px; }
.contact-mail { font-size: 22px; font-family: var(--display); }

/* footer */
.site-foot { background: var(--paper); border-top: 1px solid var(--line); padding-top: 40px; }
.foot-grid { display: grid; grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr) minmax(0, 1fr); gap: 32px; }
.foot-brand { display: flex; flex-direction: column; gap: 12px; color: var(--ink-soft); max-width: 30em; }
.foot-h { font-size: 17px; margin-bottom: 8px; }
.foot-list { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 6px; }
.foot-list a { color: var(--ink-soft); text-decoration: none; }
.foot-list a:hover { color: var(--coral); text-decoration: underline; }
.foot-base { border-top: 1px solid var(--line); margin-top: 32px; padding-block: 18px; font-size: 14px; color: var(--ink-soft); }

/* responsive */
@media (max-width: 900px) {
  .hero-row, .bundle-row, .ws-page, .pb { grid-template-columns: minmax(0, 1fr); }
  .hero-stack { height: 360px; max-width: 520px; width: 100%; margin: 0 auto; }
  .ws-info { position: static; }
  .ws-grid.small { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .bundle-img { max-height: 300px; }
}
@media (max-width: 640px) {
  body { font-size: 16px; }
  .hero-row { padding-block: 34px 40px; gap: 24px; }
  .hero-stack { height: 260px; }
  .how-steps { grid-template-columns: minmax(0, 1fr); }
  .ws-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
  .ws-title { font-size: 15.5px; }
  .ws-thumb { padding: 8px 8px 0; }
  .ws-meta { padding: 10px 12px 12px; }
  .foot-grid { grid-template-columns: minmax(0, 1fr); gap: 22px; }
  .nav a { padding: 6px 9px; font-size: 14px; }
  .brand-name { font-size: 21px; }
}