/* Study Smarter with AI — a Grassroots Intelligence service.
   Built on the Grassroots brand system (ChunkFive + Source Sans 3, cream/green/rust). */
@font-face{font-family:'ChunkFive';src:url('/assets/fonts/ChunkFive-Regular.otf') format('opentype');font-weight:400;font-display:swap}
@font-face{font-family:'Source Sans 3';src:url('/assets/fonts/SourceSans3-Regular.ttf') format('truetype');font-weight:400;font-display:swap}
@font-face{font-family:'Source Sans 3';src:url('/assets/fonts/SourceSans3-Bold.ttf') format('truetype');font-weight:700;font-display:swap}
@font-face{font-family:'Source Sans 3';src:url('/assets/fonts/SourceSans3-Italic.ttf') format('truetype');font-weight:400;font-style:italic;font-display:swap}

:root{
  --green:#6E9E4E; --green-d:#4F7A38; --brown:#8C5E3C; --brown-d:#5E3B23;
  --gold:#D9A93E; --gold-l:#F4E6BE; --cream:#FBF6EA; --ink:#33312E; --mute:#6B6760;
  --rust:#A85535; --olive:#5E7A38; --mono:'Source Sans 3',ui-monospace,SFMono-Regular,Menlo,monospace;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--cream);color:var(--ink);
  font-family:'Source Sans 3',-apple-system,Segoe UI,Roboto,sans-serif;font-size:17px;line-height:1.6}
h1,h2,h3,h4{font-family:'ChunkFive',Rockwell,Georgia,serif;font-weight:400;line-height:1.15;color:var(--brown)}
a{color:var(--green-d)}
img{max-width:100%;display:block}

/* Header / nav */
.site-header{background:#fff;border-bottom:1px solid #eadfc7;position:sticky;top:0;z-index:50}
.nav-wrap{max-width:1140px;margin:0 auto;display:flex;align-items:center;gap:16px;padding:12px 20px;flex-wrap:wrap}
.wordmark{display:flex;align-items:center;gap:10px;text-decoration:none}
.wordmark .bk{display:inline-flex;align-items:center;line-height:1}
.wordmark .bk svg{width:28px;height:28px;display:block}
.wordmark .nm{font-family:'ChunkFive',Georgia,serif;color:var(--brown);font-size:21px;letter-spacing:.01em}
.wordmark .sub{display:block;font-family:'Source Sans 3',sans-serif;color:var(--green-d);font-size:10.5px;font-weight:700;text-transform:uppercase;letter-spacing:.08em;margin-top:1px}
.nav-links{margin-left:auto;display:flex;gap:14px;flex-wrap:wrap;align-items:center;justify-content:flex-end}
.nav-links a{color:var(--brown);text-decoration:none;font-weight:700;font-size:12.5px;text-transform:uppercase;letter-spacing:.02em}
.nav-links a:hover{color:var(--green-d)}

/* Buttons */
.btn{display:inline-block;border:2px solid var(--rust);color:var(--rust);background:transparent;
  padding:11px 22px;border-radius:4px;text-decoration:none;font-weight:700;font-size:13px;
  text-transform:uppercase;letter-spacing:.06em;transition:.15s;cursor:pointer}
.btn:hover{background:var(--rust);color:#fff}
.btn.solid{background:var(--rust);color:#fff;border-color:var(--rust)}
.btn.solid:hover{background:#8f4527;border-color:#8f4527}
.btn.green{border-color:var(--green-d);color:var(--green-d)}
.btn.green:hover{background:var(--green-d);color:#fff}
.btn.green.solid{background:var(--green-d);color:#fff}
.btn.green.solid:hover{background:#3d6029}

/* Hero */
.hero{background:linear-gradient(180deg,var(--gold-l),var(--cream));padding:60px 24px 50px}
.hero-wrap{max-width:1140px;margin:0 auto;display:grid;grid-template-columns:1.05fr .95fr;gap:44px;align-items:center}
.hero h1{font-size:clamp(32px,5vw,52px);margin:0 0 14px;color:var(--brown)}
.hero .designed{font-family:'ChunkFive',Rockwell,Georgia,serif;color:var(--green-d);font-size:clamp(17px,2.2vw,22px);margin:0 0 18px}
.hero p.sub{color:#4a463f;margin:0 0 26px;font-size:18px}
.hero .ctas{display:flex;gap:14px;flex-wrap:wrap}
.hero-art img{width:100%;border-radius:16px;box-shadow:0 10px 30px rgba(94,59,35,.18)}
@media (max-width:860px){.hero-wrap{grid-template-columns:1fr;gap:28px}.hero-art{order:-1}}

/* Sub-page banner */
.subhero{background:linear-gradient(180deg,var(--gold-l),var(--cream));text-align:center;padding:56px 24px 44px}
.subhero h1{font-size:clamp(30px,4.6vw,46px);margin:0 0 12px}
.subhero p{max-width:760px;margin:0 auto;color:#4a463f;font-size:18px}

/* Call-to-action band */
.cta-band{background:var(--green-d);color:#fff;text-align:center;padding:56px 24px}
.cta-band h2{color:#fff;font-size:clamp(24px,3.4vw,34px);margin:0 0 10px}
.cta-band p{max-width:640px;margin:0 auto 22px;opacity:.95}
.cta-band .btn{border-color:#fff;color:#fff}
.cta-band .btn:hover{background:#fff;color:var(--green-d)}
.cta-band .btn.solid{background:var(--gold);border-color:var(--gold);color:#3a2c12}
.cta-band .btn.solid:hover{background:#c99a2f;border-color:#c99a2f}

/* Coloured divider */
.brand-divider{height:8px;width:100%;background:linear-gradient(90deg,var(--green) 0%,var(--gold) 50%,var(--rust) 100%)}

/* Generic section */
.section{max-width:1140px;margin:0 auto;padding:56px 20px}
.section.narrow{max-width:900px}
.section-head{text-align:center;max-width:760px;margin:0 auto 8px}
.section-head h2{font-size:clamp(26px,3.6vw,38px);margin:0 0 12px}
.section-head p{color:#4a463f;margin:0 auto;font-size:18px}
.eyebrow{display:block;font-family:'Source Sans 3',sans-serif;font-weight:700;text-transform:uppercase;
  letter-spacing:.09em;font-size:12.5px;color:var(--green-d);margin-bottom:10px}
.center{text-align:center}
.mt{margin-top:26px}

/* Prompt-swap: homework mode vs study-mentor mode (mirrors the Lab study sheet) */
.swap-band{background:#fff;border-top:1px solid #eadfc7;border-bottom:1px solid #eadfc7}
.swap-grid{display:grid;gap:18px;margin-top:30px}
.swap-row{display:grid;grid-template-columns:1fr auto 1fr;gap:16px;align-items:center}
.swap-cell{border:1px solid #eadfc7;border-radius:12px;padding:18px 20px;background:var(--cream)}
.swap-cell .tag{display:block;font-weight:700;text-transform:uppercase;letter-spacing:.07em;font-size:11.5px;margin-bottom:10px}
.swap-cell.bad{border-left:5px solid var(--rust)}
.swap-cell.bad .tag{color:var(--rust)}
.swap-cell.good{border-left:5px solid var(--green-d);background:#f3f6ec}
.swap-cell.good .tag{color:var(--green-d)}
.swap-cell .p{font-family:var(--mono);font-size:14.5px;line-height:1.5;color:#3f3b34;margin:0}
.swap-arrow{text-align:center;color:var(--gold);font-size:22px;line-height:1;margin:-4px 0}
.bigidea{margin-top:26px;background:var(--gold-l);border-radius:12px;padding:18px 22px;color:#4a463f}
.bigidea b{color:var(--brown-d)}
@media (max-width:720px){.swap-row{grid-template-columns:1fr}.swap-arrow{display:none}}

/* Flip cards (poor habit -> better habit) */
.flip-instr{text-align:center;color:var(--mute);font-size:15px;margin:22px auto 0;max-width:640px}
.flip-instr b{color:var(--brown-d)}
.flip-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:20px}
.flip{perspective:1100px;background:none;border:0;padding:0;margin:0;width:100%;font:inherit;text-align:left;cursor:pointer;display:block}
.flip-inner{position:relative;width:100%;min-height:170px;transition:transform .55s cubic-bezier(.2,.7,.3,1);transform-style:preserve-3d}
.flip.flipped .flip-inner{transform:rotateY(180deg)}
.flip-face{position:absolute;inset:0;-webkit-backface-visibility:hidden;backface-visibility:hidden;border:1px solid #eadfc7;border-radius:12px;padding:20px;display:flex;flex-direction:column}
.flip-face.front{background:var(--cream);border-left:5px solid var(--rust)}
.flip-face.back{background:#f3f6ec;border-left:5px solid var(--green-d);transform:rotateY(180deg)}
.flip-face .tag{display:block;font-weight:700;text-transform:uppercase;letter-spacing:.07em;font-size:11.5px;margin-bottom:10px}
.flip-face.front .tag{color:var(--rust)}
.flip-face.back .tag{color:var(--green-d)}
.flip-face .p{font-family:var(--mono);font-size:14.5px;line-height:1.5;color:#3f3b34;margin:0}
.flip-hint{margin-top:auto;padding-top:12px;font-size:11.5px;font-weight:700;letter-spacing:.03em;color:var(--mute)}
.flip:hover .flip-face{box-shadow:0 4px 14px rgba(94,59,35,.10)}
.flip:focus-visible{outline:2px solid var(--green);outline-offset:3px;border-radius:14px}
@media (max-width:800px){.flip-grid{grid-template-columns:1fr}}

/* Tiers (KS3 / GCSE / A-level) */
.tiers{display:grid;grid-template-columns:repeat(3,1fr);gap:26px;margin-top:30px}
.tier{background:#fff;border:1px solid #eadfc7;border-radius:14px;overflow:hidden;display:flex;flex-direction:column}
.tier img{width:100%;aspect-ratio:16/11;object-fit:cover}
.tier .body{padding:22px 22px 24px}
.tier .stage{font-family:'Source Sans 3',sans-serif;font-weight:700;text-transform:uppercase;letter-spacing:.07em;font-size:12px;color:var(--green-d)}
.tier h3{font-size:23px;color:var(--rust);margin:6px 0 12px}
.tier p{color:#4a463f;margin:0;font-size:16px}
@media (max-width:900px){.tiers{grid-template-columns:1fr}}

/* How it works / feature cards */
.features{display:grid;grid-template-columns:repeat(3,1fr);gap:26px;margin-top:30px}
.feature{background:#fff;border:1px solid #eadfc7;border-radius:12px;padding:24px}
.ic{width:54px;height:54px;border-radius:14px;display:inline-flex;align-items:center;justify-content:center;margin-bottom:14px}
.ic svg{width:28px;height:28px;display:block}
.ic.green{background:rgba(110,158,78,.16)}
.ic.rust{background:rgba(168,85,53,.14)}
.ic.gold{background:rgba(217,169,62,.22)}
.feature h3{font-size:21px;color:var(--rust);margin:0 0 10px}
.feature p{color:#4a463f;margin:0;font-size:16px}
@media (max-width:900px){.features{grid-template-columns:1fr}}

/* Pricing */
.pricing{display:grid;grid-template-columns:repeat(3,1fr);gap:26px;margin-top:30px;align-items:stretch}
.price{background:#fff;border:1px solid #eadfc7;border-radius:14px;padding:28px 24px;display:flex;flex-direction:column;text-align:center}
.price.feat{border:2px solid var(--green-d);box-shadow:0 8px 24px rgba(79,122,56,.14)}
.price .badge{align-self:center;background:var(--green-d);color:#fff;font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:.06em;padding:4px 12px;border-radius:20px;margin-bottom:12px}
.price h3{font-size:22px;color:var(--brown);margin:0 0 6px}
.price .amt{font-family:'ChunkFive',Georgia,serif;color:var(--rust);font-size:34px;margin:6px 0 2px}
.price .per{color:var(--mute);font-size:13.5px;margin-bottom:14px}
.price p{color:#4a463f;font-size:15.5px;margin:0 0 18px;flex:1}
.price .btn{align-self:center}
.price-note{text-align:center;color:var(--mute);font-size:14px;font-style:italic;margin-top:22px}
@media (max-width:900px){.pricing{grid-template-columns:1fr}}

/* Resource cards (link to AI Literacy Lab) */
.resources{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-top:30px}
.res{background:#fff;border:1px solid #eadfc7;border-radius:12px;padding:22px;display:flex;flex-direction:column}
.res h3{font-size:19px;color:var(--rust);margin:0 0 8px}
.res p{color:#4a463f;font-size:15.5px;margin:0 0 16px;flex:1}
.res a.link{font-weight:700;text-decoration:none;color:var(--green-d);font-size:14px}
.res a.link:hover{text-decoration:underline}
@media (max-width:900px){.resources{grid-template-columns:1fr}}

/* Split (about) */
.split{display:grid;grid-template-columns:1fr 1fr;gap:44px;align-items:center;max-width:1140px;margin:0 auto;padding:56px 20px}
.split .media img{width:100%;border-radius:16px;box-shadow:0 8px 24px rgba(94,59,35,.16)}
.split h2{font-size:clamp(26px,3.4vw,34px);margin:0 0 16px}
.split p{color:#4a463f;margin:0 0 14px}
@media (max-width:800px){.split{grid-template-columns:1fr;gap:26px}.split .media{order:-1}}

/* Contact form */
.contact-band{background:#fff;border-top:1px solid #eadfc7}
.form-wrap{max-width:680px;margin:26px auto 0}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.field{margin-bottom:16px}
.field label{display:block;font-weight:700;font-size:14px;color:var(--brown);margin-bottom:6px}
.field input,.field select,.field textarea{width:100%;padding:12px 14px;border:1px solid #d9cdb2;border-radius:8px;
  background:var(--cream);font-family:inherit;font-size:16px;color:var(--ink)}
.field textarea{min-height:120px;resize:vertical}
.field input:focus,.field select:focus,.field textarea:focus{outline:2px solid var(--green);border-color:var(--green)}
.form-actions{display:flex;gap:14px;align-items:center;flex-wrap:wrap}
.form-alt{color:var(--mute);font-size:14px}
@media (max-width:640px){.form-row{grid-template-columns:1fr}}

/* FAQ accordions */
.faq{max-width:820px;margin:26px auto 0}
.faq details{background:#fff;border:1px solid #eadfc7;border-radius:12px;margin-bottom:14px;overflow:hidden}
.faq summary{list-style:none;cursor:pointer;padding:18px 22px;font-family:'ChunkFive',Georgia,serif;color:var(--brown);font-size:18px;display:flex;justify-content:space-between;align-items:center;gap:14px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";color:var(--rust);font-size:26px;line-height:1;flex:0 0 auto}
.faq details[open] summary::after{content:"\2212"}
.faq details[open] summary{border-bottom:1px solid #f0e7d3}
.faq .a{padding:16px 22px 20px;color:#4a463f}
.faq .a p{margin:0 0 12px}
.faq .a p:last-child{margin:0}
.faq .a a{color:var(--green-d)}

/* Policy document */
.policy h2{font-size:23px;margin:34px 0 12px;color:var(--brown)}
.policy h3{font-size:18px;margin:22px 0 8px;color:var(--rust)}
.policy p{color:#4a463f;margin:0 0 14px}
.policy ul{margin:0 0 16px;padding-left:22px;color:#4a463f}
.policy li{margin:0 0 8px}
.policy a{color:var(--green-d)}
.policy-meta{background:#fff;border:1px solid #eadfc7;border-radius:12px;padding:18px 22px;margin:0 0 26px}
.policy-meta p{margin:4px 0;font-size:15px}
.policy-note{background:var(--gold-l);border-radius:10px;padding:14px 18px;font-size:14.5px;color:#4a463f;margin:24px 0}

/* Footer */
.site-footer{background:#2b2925;color:#d9d4ca;padding:40px 20px;font-size:14px}
.footer-wrap{max-width:1140px;margin:0 auto;display:flex;justify-content:space-between;gap:24px;flex-wrap:wrap;align-items:center}
.site-footer a{color:#e7c877;text-decoration:none}
.site-footer a:hover{text-decoration:underline}
.footer-links{display:flex;gap:20px;flex-wrap:wrap}
.footer-note{opacity:.8;margin-top:14px;font-size:13px}