/* ReadProof design system — education-first, minimal, professional.
   Paper + ink + deep green primary, gold used sparingly.
   Crypto/blockchain stays out of this layer by design. */
:root{
  --paper:#FDFCF7; --card:#FFFFFF; --card-warm:#FBF7EC;
  --ink:#17202B; --ink-soft:#3D4A5C; --muted:#7A8699;
  --line:#E7E0CE; --line-soft:#EFEAD9;
  --green:#1B5E3B; --green-dark:#123F27; --green-soft:#E7F2EB;
  --blue:#2456C8; --blue-dark:#173A8A; --blue-soft:#E8EFFC;
  --gold:#B98A2F; --gold-dark:#8A5F16; --gold-soft:#F8F0DA;
  --red:#B3261E;
  --radius:18px; --radius-sm:12px;
  --shadow:0 12px 32px rgba(23,32,43,.08);
  --shadow-lg:0 24px 64px rgba(23,32,43,.12);
  --font-body:"Inter",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-display:"Fraunces",Georgia,serif;
  --font-mono:"IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,monospace;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{animation:none!important;transition:none!important}}
body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--font-body);line-height:1.65;font-size:16px;-webkit-font-smoothing:antialiased}
a{color:var(--green);text-decoration:none}
a:hover{text-decoration:underline}
::selection{background:var(--gold-soft)}
.wrap{max-width:1120px;margin:0 auto;padding:0 22px}
:focus-visible{outline:3px solid var(--gold);outline-offset:2px;border-radius:8px}

/* ── nav ── */
.rp-nav{position:sticky;top:0;z-index:50;background:rgba(253,252,247,.9);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.rp-nav .wrap{display:flex;align-items:center;gap:16px;padding-top:12px;padding-bottom:12px}
.rp-brand{display:flex;align-items:center;gap:10px;font-family:var(--font-display);font-weight:800;font-size:19px;color:var(--ink);letter-spacing:-.01em}
.rp-brand:hover{text-decoration:none}
.rp-brand-mark{width:32px;height:32px;border-radius:9px;background:linear-gradient(150deg,var(--green),var(--green-dark));color:#fff;display:grid;place-items:center;font-size:16px;font-weight:800;flex:none}
.rp-links{margin-left:auto;display:flex;align-items:center;gap:4px;flex-wrap:wrap}
.rp-links a{color:var(--ink-soft);font-size:14px;font-weight:600;padding:8px 12px;border-radius:10px}
.rp-links a:hover{background:var(--green-soft);color:var(--green-dark);text-decoration:none}
.rp-links a.cta{background:var(--green);color:#fff}
.rp-links a.cta:hover{background:var(--green-dark)}
@media(max-width:760px){.rp-links a:not(.cta):not(.keep){display:none}}

/* ── hero ── */
.rp-hero{padding:72px 0 52px;position:relative;overflow:hidden}
.rp-hero::before{content:"";position:absolute;inset:0;background:radial-gradient(700px 320px at 85% 10%,var(--gold-soft),transparent 70%),radial-gradient(600px 300px at 10% 90%,var(--green-soft),transparent 70%);pointer-events:none}
.rp-hero .wrap{position:relative;display:grid;grid-template-columns:1.15fr .85fr;gap:44px;align-items:center}
.rp-eyebrow{display:inline-flex;align-items:center;gap:8px;font-family:var(--font-mono);font-size:11.5px;letter-spacing:.12em;text-transform:uppercase;color:var(--green-dark);background:var(--green-soft);border:1px solid #CFE3D6;padding:7px 13px;border-radius:999px;font-weight:600}
.rp-h1{font-family:var(--font-display);font-size:clamp(2.6rem,5.4vw,4.4rem);line-height:1.02;letter-spacing:-.025em;margin:20px 0 16px;font-weight:800}
.rp-h1 em{font-style:italic;color:var(--green-dark)}
.rp-lead{font-size:1.12rem;color:var(--ink-soft);max-width:34rem;margin:0 0 28px}
.rp-actions{display:flex;gap:12px;flex-wrap:wrap;margin-bottom:22px}
.rp-proofline{display:flex;gap:18px;flex-wrap:wrap;font-size:13px;color:var(--muted)}
.rp-proofline span{display:inline-flex;align-items:center;gap:7px}
.rp-proofline b{color:var(--green-dark)}

/* ── buttons ── */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:9px;min-height:48px;padding:0 22px;border-radius:14px;font-weight:700;font-size:15px;border:1px solid transparent;cursor:pointer;transition:transform .14s ease,box-shadow .14s ease,background .14s ease}
.btn:hover{text-decoration:none;transform:translateY(-1px)}
.btn-primary{background:var(--green);color:#fff;box-shadow:0 10px 24px rgba(27,94,59,.28)}
.btn-primary:hover{background:var(--green-dark);color:#fff}
.btn-dark{background:var(--ink);color:#fff}
.btn-dark:hover{background:#000;color:#fff}
.btn-ghost{background:#fff;color:var(--ink);border-color:var(--line)}
.btn-ghost:hover{border-color:var(--green);color:var(--green-dark)}
.btn-gold{background:linear-gradient(180deg,#E9CE8F,var(--gold));color:#241A05}
.btn-sm{min-height:38px;padding:0 15px;font-size:13.5px;border-radius:11px}
.btn-lg{min-height:56px;padding:0 30px;font-size:16.5px}

/* ── sections ── */
.rp-section{padding:56px 0}
.rp-section.tight{padding:36px 0}
.rp-kicker{font-family:var(--font-mono);font-size:11.5px;letter-spacing:.14em;text-transform:uppercase;color:var(--gold-dark);font-weight:600;margin:0 0 10px}
.rp-h2{font-family:var(--font-display);font-size:clamp(1.7rem,3.2vw,2.5rem);letter-spacing:-.02em;line-height:1.1;margin:0 0 12px;font-weight:800}
.rp-sub{color:var(--ink-soft);max-width:44rem;margin:0 0 30px;font-size:1.03rem}
.rp-center{text-align:center}
.rp-center .rp-sub{margin-left:auto;margin-right:auto}

/* ── cards & grids ── */
.rp-grid{display:grid;gap:18px}
.rp-grid.cols-3{grid-template-columns:repeat(3,1fr)}
.rp-grid.cols-2{grid-template-columns:repeat(2,1fr)}
.rp-grid.cols-4{grid-template-columns:repeat(4,1fr)}
@media(max-width:900px){.rp-grid.cols-3,.rp-grid.cols-4{grid-template-columns:1fr 1fr}}
@media(max-width:620px){.rp-grid.cols-3,.rp-grid.cols-2,.rp-grid.cols-4{grid-template-columns:1fr}}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:26px;box-shadow:var(--shadow);position:relative}
.card.flat{box-shadow:none}
.role-card{overflow:hidden;padding-top:0}
.role-card .role-band{height:8px;margin:0 -26px 20px;border-radius:var(--radius) var(--radius) 0 0}
.role-card.student .role-band{background:linear-gradient(90deg,#1E7A4C,#58CC02)}
.role-card.reader .role-band{background:linear-gradient(90deg,#173A8A,#3B82F6)}
.role-card.teacher .role-band{background:linear-gradient(90deg,#8A5F16,#E3B341)}
.role-tag{display:inline-block;font-family:var(--font-mono);font-size:10.5px;letter-spacing:.14em;font-weight:600;padding:5px 11px;border-radius:999px;margin-bottom:12px}
.student .role-tag{background:var(--green-soft);color:var(--green-dark)}
.reader .role-tag{background:var(--blue-soft);color:var(--blue-dark)}
.teacher .role-tag{background:var(--gold-soft);color:var(--gold-dark)}
.card h3{font-family:var(--font-display);font-size:1.42rem;margin:0 0 8px;letter-spacing:-.01em}
.card p{color:var(--ink-soft);margin:0 0 14px;font-size:.96rem}
.check-list{list-style:none;margin:0 0 20px;padding:0;display:grid;gap:9px}
.check-list li{display:flex;gap:10px;align-items:flex-start;font-size:.93rem;color:var(--ink-soft)}
.check-list li::before{content:"✓";flex:none;width:22px;height:22px;border-radius:50%;display:grid;place-items:center;font-size:12px;font-weight:800;margin-top:1px}
.student .check-list li::before{background:var(--green-soft);color:var(--green-dark)}
.reader .check-list li::before{background:var(--blue-soft);color:var(--blue-dark)}
.teacher .check-list li::before{background:var(--gold-soft);color:var(--gold-dark)}
.role-figure{display:block;width:100%;height:auto;border-radius:14px;margin-bottom:18px;background:var(--card-warm);border:1px solid var(--line-soft)}

/* ── flow (Book → Read → Challenge → Proof) ── */
.flow{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(5,1fr);gap:0;align-items:stretch}
.flow li{position:relative;background:var(--card);border:1px solid var(--line);padding:20px 16px;text-align:center}
.flow li:first-child{border-radius:var(--radius-sm) 0 0 var(--radius-sm)}
.flow li:last-child{border-radius:0 var(--radius-sm) var(--radius-sm) 0;background:var(--green-dark);color:#fff;border-color:var(--green-dark)}
.flow li:not(:last-child)::after{content:"→";position:absolute;right:-14px;top:50%;transform:translateY(-50%);z-index:2;width:26px;height:26px;border-radius:50%;background:var(--gold);color:#fff;font-size:14px;font-weight:800;display:grid;place-items:center}
.flow .flow-ic{font-size:26px;display:block;margin-bottom:8px}
.flow b{display:block;font-size:.92rem}
.flow span{font-size:.78rem;opacity:.75}
@media(max-width:760px){.flow{grid-template-columns:1fr}.flow li:first-child{border-radius:var(--radius-sm) var(--radius-sm) 0 0}.flow li:last-child{border-radius:0 0 var(--radius-sm) var(--radius-sm)}.flow li:not(:last-child)::after{content:"↓";right:50%;top:auto;bottom:-14px;transform:translateX(50%)}}

/* ── steps ── */
.steps{counter-reset:step;display:grid;gap:14px;margin:0;padding:0;list-style:none}
.steps li{background:var(--card);border:1px solid var(--line);border-radius:var(--radius-sm);padding:18px 20px 18px 66px;position:relative}
.steps li::before{counter-increment:step;content:counter(step);position:absolute;left:20px;top:18px;width:32px;height:32px;border-radius:50%;background:var(--green);color:#fff;font-weight:800;display:grid;place-items:center;font-size:15px}
.steps b{display:block;font-size:1rem;margin-bottom:2px}
.steps p{margin:0;color:var(--ink-soft);font-size:.92rem}

/* ── stats ── */
.stat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
@media(max-width:760px){.stat-grid{grid-template-columns:1fr 1fr}}
.stat{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:16px 18px;border-left:4px solid var(--gold)}
.stat .v{font-family:var(--font-display);font-size:1.7rem;font-weight:800;line-height:1.1}
.stat .l{font-size:.8rem;color:var(--muted)}

/* ── table ── */
.tbl-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:var(--radius-sm);background:var(--card)}
table.tbl{width:100%;border-collapse:collapse;font-size:.9rem;min-width:560px}
.tbl th,.tbl td{padding:11px 14px;text-align:left;border-bottom:1px solid var(--line-soft)}
.tbl th{font-family:var(--font-mono);font-size:.68rem;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);background:var(--card-warm)}
.tbl tr:last-child td{border-bottom:0}
.pill{display:inline-block;padding:3px 11px;border-radius:999px;font-size:.75rem;font-weight:700}
.pill.ok{background:var(--green-soft);color:var(--green-dark)}
.pill.warn{background:var(--gold-soft);color:var(--gold-dark)}
.pill.info{background:var(--blue-soft);color:var(--blue-dark)}
.pill.mut{background:#EFF1F4;color:var(--muted)}

/* ── certificate ── */
.cert{background:#fff;border:2px solid var(--gold);border-radius:10px;padding:34px 30px;text-align:center;position:relative;max-width:560px;margin:0 auto;box-shadow:var(--shadow-lg)}
.cert::before{content:"";position:absolute;inset:8px;border:1px dashed var(--gold);border-radius:6px;pointer-events:none}
.cert .cert-k{font-family:var(--font-mono);font-size:.68rem;letter-spacing:.28em;color:var(--gold-dark);margin-bottom:6px}
.cert h3{font-family:var(--font-display);font-size:1.9rem;margin:0 0 4px}
.cert .cert-book{font-family:var(--font-display);font-style:italic;font-size:1.25rem;color:var(--green-dark)}
.cert .cert-name{font-size:1.05rem;font-weight:700;margin-top:10px}
.cert .cert-meta{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;margin-top:16px;font-family:var(--font-mono);font-size:.72rem;color:var(--muted)}
.demo-tag{display:inline-block;font-family:var(--font-mono);font-size:.68rem;letter-spacing:.1em;background:#EFF1F4;color:var(--muted);border:1px dashed #B9C2CF;padding:4px 10px;border-radius:6px}

/* ── book cards ── */
.book-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(210px,1fr));gap:16px}
.book-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius-sm);padding:16px;box-shadow:var(--shadow)}
.book-card img{width:100%;aspect-ratio:3/4;object-fit:cover;border-radius:8px;background:var(--card-warm);margin-bottom:10px}
.book-card h4{font-family:var(--font-display);margin:0 0 2px;font-size:1.05rem}
.book-card .a{font-size:.82rem;color:var(--muted);margin-bottom:8px}

/* ── tech / blockchain note ── */
.tech-band{background:var(--ink);color:#D8DEE8;border-radius:var(--radius);padding:34px 32px;position:relative;overflow:hidden}
.tech-band h3{font-family:var(--font-display);color:#fff;margin:0 0 8px;font-size:1.5rem}
.tech-band p{color:#9AA6B8;margin:0 0 18px;max-width:40rem;font-size:.95rem}
.tech-band code{font-family:var(--font-mono);font-size:.76rem;background:rgba(255,255,255,.08);padding:2px 8px;border-radius:6px;color:#E9CE8F}
.tech-checks{display:grid;gap:8px;margin:0 0 18px;padding:0;list-style:none;font-size:.9rem}
.tech-checks li::before{content:"✓ ";color:#7BD88F;font-weight:800}

/* ── tabs (panels) ── */
.tabs{display:flex;gap:8px;flex-wrap:wrap;margin:0 0 22px}
.tab{border:1px solid var(--line);background:#fff;color:var(--green-dark);font-weight:700;font-size:.88rem;padding:9px 18px;border-radius:999px;cursor:pointer;font-family:var(--font-body)}
.tab[aria-selected="true"]{background:var(--green);border-color:var(--green);color:#fff}

/* ── forms ── */
.field{margin:0 0 14px}
.field label{display:block;font-size:.78rem;font-weight:700;color:var(--muted);margin-bottom:5px}
.field input,.field textarea,.field select{width:100%;font:inherit;padding:11px 13px;border:1px solid var(--line);border-radius:10px;background:#fff;color:var(--ink)}
.field textarea{min-height:96px;resize:vertical}
.form-row{display:flex;gap:12px;flex-wrap:wrap}
.form-row .field{flex:1;min-width:180px}

/* ── footer ── */
.rp-footer{background:var(--ink);color:#B9C2CF;margin-top:64px;font-size:.86rem}
.rp-footer .wrap{display:flex;justify-content:space-between;align-items:center;gap:14px;flex-wrap:wrap;padding-top:26px;padding-bottom:30px}
.rp-footer a{color:#E9CE8F}
.rp-footer .fbrand{font-family:var(--font-display);color:#fff;font-weight:800;font-size:1.05rem}

/* ── redirect ── */
.redirect-box{max-width:560px;margin:9vh auto;text-align:center;background:var(--card);border:1px solid var(--line);border-radius:22px;padding:52px 40px;box-shadow:var(--shadow-lg)}
.redirect-box .count{font-family:var(--font-display);font-size:4.4rem;font-weight:800;color:var(--green-dark);line-height:1;margin:14px 0}
.spinner{width:46px;height:46px;border-radius:50%;border:4px solid var(--line);border-top-color:var(--green);margin:0 auto 8px;animation:spin 1s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}

/* ── misc ── */
.muted{color:var(--muted)}
.mono{font-family:var(--font-mono)}
.ic{width:1.15em;height:1.15em;vertical-align:-.2em;fill:none;stroke:currentColor;flex:none}
h3 .ic{color:var(--green-dark);margin-right:8px}
.rp-kicker .ic{width:1.1em;height:1.1em;vertical-align:-.15em;margin-right:2px}
.qa{list-style:none;margin:14px 0 0;padding:0;display:grid;gap:8px}
.qa li{display:flex;gap:10px;align-items:flex-start;font-size:.92rem;color:var(--ink-soft);border:1px solid var(--line-soft);border-radius:10px;padding:10px 12px;background:#fff}
.qa li.hit{border-color:var(--green);background:var(--green-soft);color:var(--green-dark);font-weight:600}
.qa .k{font-family:var(--font-mono);font-size:.72rem;font-weight:700;border:1px solid var(--line);border-radius:6px;padding:2px 7px;flex:none;margin-top:1px;color:var(--muted)}
.qa li.hit .k{background:var(--green);border-color:var(--green);color:#fff}
.api-dot{display:inline-block;width:8px;height:8px;border-radius:50%;background:#C9CFD8;margin-right:6px;vertical-align:1px}
.api-dot.on{background:var(--green)}
.lang-sw{display:inline-flex;border:1px solid var(--line);border-radius:999px;overflow:hidden;background:#fff;flex:none}
.lang-sw button{border:0;background:transparent;padding:7px 11px;font:inherit;font-size:.76rem;font-weight:700;color:var(--muted);cursor:pointer}
.lang-sw button.on{background:var(--green);color:#fff}
.camp-row{display:flex;gap:10px;align-items:baseline;justify-content:space-between;padding:9px 0;border-bottom:1px solid var(--line-soft);font-size:.9rem}
.camp-row:last-child{border-bottom:0}
.divider-fancy{border:none;border-top:2px dashed var(--line);margin:8px 0 0;position:relative}
.hero-split .panel{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow-lg);padding:28px;position:relative}
.proof-mini{border:1px solid var(--line);border-radius:var(--radius-sm);padding:14px 16px;background:var(--card-warm);font-size:.86rem;margin-top:14px}
code.inline{font-family:var(--font-mono);font-size:.8em;background:var(--gold-soft);padding:1px 7px;border-radius:6px}
@media(max-width:900px){.rp-hero{padding:52px 0 40px}.rp-hero .wrap{grid-template-columns:1fr}.rp-section{padding:42px 0}}