:root{
  --paper:#F5F6FA;
  --paper-line:#E5E8F1;
  --ink:#16233B;
  --ink-soft:#5B6472;
  --stamp-red:#B23B32;
  --brand-blue:#2F5FE0;
  --brand-blue-pale:#E7EDFB;
  --card:#FFFFFF;
  --divider:#DDE1EC;
  --whatsapp:#25D366;
  --whatsapp-dark:#178A45;

  --font-serif:'Source Serif 4', Georgia, 'Times New Roman', serif;
  --font-mono:'IBM Plex Mono', 'Courier New', monospace;
  --font-body:'Inter', system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
}

@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --paper:#10141F;
    --paper-line:#1C2233;
    --ink:#E9ECF5;
    --ink-soft:#9CA6BA;
    --stamp-red:#E2756C;
    --brand-blue:#8FADF5;
    --brand-blue-pale:#1B2848;
    --card:#161B29;
    --divider:#283044;
    --whatsapp-dark:#1DA851;
  }
}
:root[data-theme="dark"]{
  --paper:#10141F;
  --paper-line:#1C2233;
  --ink:#E9ECF5;
  --ink-soft:#9CA6BA;
  --stamp-red:#E2756C;
  --brand-blue:#8FADF5;
  --brand-blue-pale:#1B2848;
  --card:#161B29;
  --divider:#283044;
  --whatsapp-dark:#1DA851;
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:var(--font-body);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;}
h1,h2,h3{
  font-family:var(--font-serif);
  color:var(--ink);
  margin:0 0 .5em;
  line-height:1.18;
  font-weight:600;
}
p{margin:0 0 1em;color:var(--ink-soft);max-width:62ch;}

.container{
  max-width:1120px;
  margin:0 auto;
  padding-inline:24px;
}

.section{padding-block:84px;}
@media (max-width:640px){.section{padding-block:52px;}}
.section h2{
  font-size:clamp(1.55rem, 3vw, 2.15rem);
  max-width:34ch;
}
.section h2::before{
  content:"";
  display:block;
  width:34px;
  height:4px;
  border-radius:2px;
  background:var(--brand-blue);
  margin-bottom:16px;
}
.cta-final h2::before{background:var(--whatsapp);}

/* Buttons — cut like a stamped ticket, press on interaction */
.btn{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-weight:600;
  font-family:var(--font-body);
  font-size:1rem;
  border-radius:5px;
  border:1.5px solid var(--ink);
  padding:13px 26px;
  background:var(--card);
  color:var(--ink);
  cursor:pointer;
  box-shadow:3px 3px 0 var(--ink);
  transition:transform .12s ease, box-shadow .12s ease;
  white-space:nowrap;
}
.btn svg{width:19px;height:19px;fill:currentColor;flex-shrink:0;}
.btn:hover{transform:translate(3px,3px);box-shadow:0 0 0 var(--ink);}
.btn:active{transform:translate(3px,3px);box-shadow:none;}
.btn-lg{padding:15px 30px;font-size:1.02rem;}
.btn-sm{padding:8px 16px;font-size:.88rem;box-shadow:2px 2px 0 var(--ink);}
.btn-sm:hover{transform:translate(2px,2px);}

.btn-whatsapp{
  background:var(--whatsapp);
  border-color:var(--whatsapp-dark);
  color:#fff;
  box-shadow:3px 3px 0 var(--whatsapp-dark);
}
.btn-whatsapp.btn-sm{box-shadow:2px 2px 0 var(--whatsapp-dark);}
.btn-whatsapp:hover{box-shadow:0 0 0 var(--whatsapp-dark);}

.btn-ghost{background:transparent;}

/* Header */
.site-header{
  position:sticky;
  top:0;
  z-index:50;
  background:var(--paper);
  border-bottom:1.5px solid var(--ink);
}
.header-inner{
  display:flex;
  align-items:center;
  gap:24px;
  height:68px;
}
.brand{
  display:flex;
  align-items:center;
  height:26px;
  margin-right:auto;
}
.brand img{height:100%;width:auto;}

.logo-dark-mode{display:none;}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]) .logo-light-mode{display:none;}
  :root:not([data-theme="light"]) .logo-dark-mode{display:block;}
}
:root[data-theme="dark"] .logo-light-mode{display:none;}
:root[data-theme="dark"] .logo-dark-mode{display:block;}
.nav-desktop{
  display:flex;
  gap:30px;
  margin-right:auto;
}
.nav-desktop a{
  color:var(--ink-soft);
  font-weight:500;
  font-size:.94rem;
}
.nav-desktop a:hover{color:var(--brand-blue);}
.nav-cta{flex-shrink:0;}

.nav-toggle{
  display:none;
  flex-direction:column;
  justify-content:center;
  gap:5px;
  width:34px;
  height:34px;
  background:none;
  border:none;
  cursor:pointer;
  flex-shrink:0;
}
.nav-toggle span{
  width:100%;
  height:2px;
  background:var(--ink);
}
.nav-mobile{
  display:none;
  flex-direction:column;
  padding:6px 24px 18px;
  border-top:1px solid var(--divider);
}
.nav-mobile a{
  padding:12px 0;
  border-bottom:1px solid var(--divider);
  color:var(--ink);
  font-weight:500;
}
.nav-mobile a:last-child{border-bottom:none;}

@media (max-width:860px){
  .nav-desktop{display:none;}
  .nav-toggle{display:flex;}
  .site-header.nav-open .nav-mobile{display:flex;}
  .nav-cta{display:none;}
}

/* Hero — a document sitting on ruled ledger paper */
.hero{
  background-image:repeating-linear-gradient(
    to bottom,
    transparent 0,
    transparent 27px,
    var(--paper-line) 27px,
    var(--paper-line) 28px
  );
  padding-block:96px 88px;
}
@media (max-width:640px){.hero{padding-block:48px 56px;}}
.hero-inner{
  display:flex;
  justify-content:center;
}
.hero-stack{display:none;}

.hero-doc{
  position:relative;
  background:var(--card);
  border:1.5px solid var(--ink);
  padding:52px 52px 60px;
  max-width:700px;
  width:100%;
}
.hero-doc::before,
.hero-doc::after{
  content:"";
  position:absolute;
  inset:0;
  border:1.5px solid var(--ink);
  z-index:-1;
}
.hero-doc::before{background:var(--card);transform:translate(9px,9px);}
.hero-doc::after{background:var(--brand-blue-pale);transform:translate(18px,18px);}

.hero-doc-head{
  display:flex;
  justify-content:space-between;
  align-items:baseline;
  gap:16px;
  border-bottom:1px solid var(--divider);
  padding-bottom:18px;
  margin-bottom:30px;
  flex-wrap:wrap;
}
.hero-doc-brand{
  display:block;
  height:20px;
}
.hero-doc-brand img{height:100%;width:auto;}
.hero-doc-folio{
  font-family:var(--font-mono);
  font-size:.82rem;
  color:var(--ink-soft);
}

.hero-doc h1{
  font-size:clamp(1.9rem, 4vw, 2.7rem);
  max-width:20ch;
}
.hero-sub{
  font-size:1.08rem;
  max-width:52ch;
  margin-bottom:30px;
}
.hero-actions{
  display:flex;
  flex-wrap:wrap;
  gap:14px;
  margin-bottom:26px;
}
.hero-fine{
  font-size:.88rem;
  color:var(--ink-soft);
  max-width:48ch;
  margin-bottom:0;
}

.stamp{
  position:absolute;
  right:-14px;
  bottom:-26px;
  width:124px;
  height:124px;
  border:3px solid var(--stamp-red);
  border-radius:50%;
  display:flex;
  flex-direction:column;
  align-items:center;
  justify-content:center;
  gap:1px;
  transform:rotate(-11deg);
  color:var(--stamp-red);
  font-family:var(--font-mono);
  font-size:.58rem;
  font-weight:600;
  letter-spacing:.03em;
  text-align:center;
  background:var(--card);
}
.stamp::before{
  content:"";
  position:absolute;
  inset:7px;
  border:1px solid var(--stamp-red);
  border-radius:50%;
}
.stamp-mid{
  font-family:var(--font-serif);
  font-size:1rem;
  font-weight:700;
  letter-spacing:0;
}
@media (max-width:640px){
  .hero-doc{padding:36px 28px 44px;}
  .stamp{
    position:static;
    transform:rotate(-4deg);
    margin:28px auto 0;
  }
}

/* Problem — ledger comparison, no cards */
.problem{background:var(--card);}
.problem-intro{
  max-width:68ch;
  font-size:1.05rem;
  margin-top:18px;
}
.ledger-compare{
  display:grid;
  grid-template-columns:1fr 1fr;
  margin-top:44px;
  border-top:1.5px solid var(--ink);
  border-bottom:1.5px solid var(--ink);
}
.ledger-col{padding:32px 40px;}
.ledger-col:first-child{border-right:1px solid var(--divider);}
.ledger-col h3{
  font-family:var(--font-mono);
  font-size:.8rem;
  font-weight:600;
  color:var(--ink-soft);
  margin-bottom:20px;
}
.ledger-col ul{
  list-style:none;
  padding:0;
  margin:0;
  display:flex;
  flex-direction:column;
  gap:14px;
}
.ledger-col li{
  color:var(--ink-soft);
  text-decoration:line-through;
  text-decoration-color:var(--divider);
  text-decoration-thickness:1.5px;
  font-size:.98rem;
}
.ledger-col-after{background:var(--brand-blue-pale);}
.ledger-col-after h3{
  color:var(--brand-blue);
  display:flex;
  align-items:center;
  gap:8px;
}
.ledger-col-after h3 svg{width:16px;height:16px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;}
.ledger-col-after p{color:var(--ink);font-size:1.05rem;margin:0;max-width:none;}

@media (max-width:760px){
  .ledger-compare{grid-template-columns:1fr;}
  .ledger-col:first-child{border-right:none;border-bottom:1px solid var(--divider);}
}

/* Modules — a horizontal slider of app-style cards */
.modules-head{
  display:flex;
  justify-content:space-between;
  align-items:flex-end;
  gap:16px;
  flex-wrap:wrap;
}
.modules-head h2{margin-bottom:0;}

.slider-nav{display:flex;gap:10px;flex-shrink:0;}
.slider-btn{
  width:40px;
  height:40px;
  border-radius:50%;
  border:1.5px solid var(--ink);
  background:var(--card);
  color:var(--ink);
  display:flex;
  align-items:center;
  justify-content:center;
  cursor:pointer;
  box-shadow:2px 2px 0 var(--ink);
  transition:transform .12s ease, box-shadow .12s ease, opacity .12s ease;
}
.slider-btn svg{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;}
.slider-btn:hover{transform:translate(2px,2px);box-shadow:0 0 0 var(--ink);}
.slider-btn:disabled{opacity:.3;cursor:default;transform:none;box-shadow:2px 2px 0 var(--ink);}

.modules-track{
  display:flex;
  gap:20px;
  margin-top:36px;
  padding:4px 4px 14px;
  overflow-x:auto;
  scroll-snap-type:x mandatory;
  scrollbar-width:none;
}
.modules-track::-webkit-scrollbar{display:none;}

.module-slide{
  flex:0 0 auto;
  width:270px;
  scroll-snap-align:start;
  background:var(--card);
  border:1px solid var(--divider);
  border-radius:16px;
  padding:26px 22px;
}
.module-icon{
  width:50px;
  height:50px;
  border-radius:13px;
  display:flex;
  align-items:center;
  justify-content:center;
  margin-bottom:18px;
  font-size:1.5rem;
  line-height:1;
}
.module-slide h3{font-size:1.02rem;margin-bottom:8px;}
.module-slide p{margin:0;font-size:.9rem;max-width:none;}

.module-icon-blue{background:#E7EDFB;color:#2F5FE0;}
.module-icon-amber{background:#FBF0DD;color:#B8710A;}
.module-icon-green{background:#E1F3EA;color:#12895A;}
.module-icon-violet{background:#EEE7FA;color:#6D3FC0;}
.module-icon-rose{background:#FBE7EE;color:#C23E6B;}
.module-icon-teal{background:#E1F2F4;color:#0E7C8C;}
.module-icon-indigo{background:#E8E6F7;color:#4338A8;}

@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]) .module-icon-blue{background:#1B2848;color:#8FADF5;}
  :root:not([data-theme="light"]) .module-icon-amber{background:#2E2413;color:#E8B65B;}
  :root:not([data-theme="light"]) .module-icon-green{background:#153322;color:#5FCB93;}
  :root:not([data-theme="light"]) .module-icon-violet{background:#241D3A;color:#B79BF0;}
  :root:not([data-theme="light"]) .module-icon-rose{background:#331D26;color:#EA9AB6;}
  :root:not([data-theme="light"]) .module-icon-teal{background:#132C30;color:#6FCAD8;}
  :root:not([data-theme="light"]) .module-icon-indigo{background:#1E1D3A;color:#A6A0EE;}
}
:root[data-theme="dark"] .module-icon-blue{background:#1B2848;color:#8FADF5;}
:root[data-theme="dark"] .module-icon-amber{background:#2E2413;color:#E8B65B;}
:root[data-theme="dark"] .module-icon-green{background:#153322;color:#5FCB93;}
:root[data-theme="dark"] .module-icon-violet{background:#241D3A;color:#B79BF0;}
:root[data-theme="dark"] .module-icon-rose{background:#331D26;color:#EA9AB6;}
:root[data-theme="dark"] .module-icon-teal{background:#132C30;color:#6FCAD8;}
:root[data-theme="dark"] .module-icon-indigo{background:#1E1D3A;color:#A6A0EE;}

.slider-dots{
  display:flex;
  gap:8px;
  margin-top:6px;
  justify-content:center;
}
.slider-dot{
  width:7px;
  height:7px;
  padding:0;
  border:none;
  border-radius:50%;
  background:var(--divider);
  cursor:pointer;
}
.slider-dot.active{background:var(--brand-blue);}

@media (max-width:760px){
  .module-slide{width:240px;}
}

/* Benefits — quiet list, no icon circles */
.benefits{background:var(--card);}
.benefits-grid{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:0 56px;
  margin-top:40px;
}
.benefit{
  padding:26px 0;
  border-top:1px solid var(--divider);
}
.benefit-icon{
  width:44px;
  height:44px;
  border-radius:12px;
  background:var(--brand-blue-pale);
  display:flex;
  align-items:center;
  justify-content:center;
  margin-bottom:16px;
  font-size:1.3rem;
  line-height:1;
}
.benefit h3{font-size:1.08rem;margin-bottom:8px;}
.benefit p{font-size:.95rem;margin:0;}
@media (max-width:700px){
  .benefits-grid{grid-template-columns:1fr;gap:0;}
}

/* Final CTA — signed-document footer band */
.cta-final{
  background:var(--ink);
}
.cta-final-inner{max-width:600px;}
.cta-final h2{color:var(--paper);font-size:clamp(1.6rem,3.2vw,2.15rem);max-width:26ch;}
.cta-final p{color:#B7C0D9;font-size:1.08rem;max-width:52ch;}
.cta-final .btn{
  background:var(--whatsapp);
  border-color:var(--whatsapp-dark);
  box-shadow:3px 3px 0 var(--whatsapp-dark);
}
.cta-final .btn:hover{box-shadow:0 0 0 var(--whatsapp-dark);}
.cta-phone{margin-top:22px;font-size:.92rem;color:#93A0BF;}
.cta-phone a{color:var(--paper);font-weight:600;border-bottom:1px solid var(--stamp-red);}

/* Footer */
.site-footer{
  background:#0B1220;
  color:#93A0BF;
  padding-block:44px;
  border-top:1px solid #1B2436;
}
.footer-inner{max-width:520px;}
.footer-brand{margin-bottom:12px;height:20px;display:flex;align-items:center;}
.footer-brand img{height:20px;width:auto;}
.site-footer p{color:#93A0BF;font-size:.9rem;max-width:none;}
.footer-copy{margin-top:14px;font-size:.8rem;color:#64708A;}

/* WhatsApp floating button (mobile) */
.whatsapp-fab{
  position:fixed;
  bottom:22px;
  right:22px;
  width:56px;
  height:56px;
  border-radius:50%;
  background:var(--whatsapp);
  border:1.5px solid var(--whatsapp-dark);
  display:flex;
  align-items:center;
  justify-content:center;
  box-shadow:3px 3px 0 var(--whatsapp-dark);
  z-index:60;
}
.whatsapp-fab svg{width:28px;height:28px;fill:#fff;}
.whatsapp-fab:hover{transform:translate(2px,2px);box-shadow:0 0 0 var(--whatsapp-dark);}