/* =========================================================
   PublishCalc — design system
   Editorial ledger aesthetic: quiet paper surface, one
   working-green accent, tabular mono figures for all numbers.
   ========================================================= */

:root{
  /* --- palette --- */
  --paper:        #F5F6F2;
  --paper-raised: #FFFFFF;
  --ink:          #1B2420;
  --ink-soft:     #47524B;
  --muted:        #6E7A72;
  --line:         #DBDED2;
  --line-strong:  #C3C8B9;
  --accent:       #2F6E56;      /* ledger green — the one accent */
  --accent-dark:  #234F3F;
  --accent-tint:  #E7EFE9;
  --amber:        #9A5B22;      /* semantic: warnings / disclaimers only */
  --amber-tint:   #F3E7D8;
  --red:          #8C3A2D;      /* semantic: validation errors only */

  /* --- type --- */
  --font-display: "Source Serif 4", Georgia, "Times New Roman", serif;
  --font-body:    "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono:    "IBM Plex Mono", "SFMono-Regular", Consolas, monospace;

  /* --- scale --- */
  --step--1: 0.875rem;
  --step-0:  1rem;
  --step-1:  1.25rem;
  --step-2:  1.625rem;
  --step-3:  2.125rem;
  --step-4:  2.875rem;
  --step-5:  3.75rem;

  --radius-sm: 3px;
  --radius-md: 5px;

  --content-max: 1120px;
  --measure: 68ch;

  --shadow-card: 0 1px 2px rgba(27,36,32,0.06), 0 8px 24px -16px rgba(27,36,32,0.18);
}

*, *::before, *::after{ box-sizing: border-box; }
html{ -webkit-text-size-adjust: 100%; }

body{
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: var(--step-0);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

img, svg{ max-width: 100%; display: block; }

h1, h2, h3, h4{
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.15;
  margin: 0 0 0.5em;
  color: var(--ink);
  letter-spacing: -0.01em;
}
h1{ font-size: var(--step-4); }
h2{ font-size: var(--step-3); }
h3{ font-size: var(--step-2); }
h4{ font-size: var(--step-1); font-family: var(--font-body); font-weight: 700; }

p{ margin: 0 0 1em; color: var(--ink-soft); }
p.lede{ font-size: var(--step-1); color: var(--ink-soft); max-width: var(--measure); }

a{ color: var(--accent-dark); text-decoration-color: var(--line-strong); text-underline-offset: 3px; }
a:hover{ color: var(--accent); }
a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible, summary:focus-visible{
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

.container{
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 0 24px;
}

.eyebrow{
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-dark);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 14px;
}
.eyebrow::before{
  content: "";
  width: 14px;
  height: 1px;
  background: var(--accent);
  display: inline-block;
}

hr, .rule{
  border: none;
  border-top: 1px solid var(--line);
  margin: 48px 0;
}

/* =========================
   Header / nav
   ========================= */
.site-header{
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(245,246,242,0.92);
  backdrop-filter: saturate(140%) blur(6px);
  border-bottom: 1px solid var(--line);
}
.site-header .container{
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}
.brand{
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.15rem;
  color: var(--ink);
  text-decoration: none;
}
.brand svg{ width: 26px; height: 26px; color: var(--accent); }
.brand:hover{ color: var(--ink); }

.nav-links{
  display: flex;
  align-items: center;
  gap: 24px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 0.9rem;
}
.nav-links a{
  color: var(--ink-soft);
  text-decoration: none;
  font-weight: 500;
  white-space: nowrap;
}
.nav-links a:hover, .nav-links a[aria-current="page"]{ color: var(--accent-dark); }

.nav-toggle{
  display: none;
  background: none;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-sm);
  padding: 8px 10px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--ink);
  cursor: pointer;
}

@media (max-width: 1040px) and (min-width: 861px){
  .nav-links{ gap: 14px; font-size: 0.82rem; }
}

@media (max-width: 860px){
  .nav-toggle{ display: inline-flex; }
  .nav-links{
    position: absolute;
    top: 68px; left: 0; right: 0;
    background: var(--paper-raised);
    border-bottom: 1px solid var(--line);
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    padding: 8px 24px 18px;
    display: none;
  }
  .nav-links.open{ display: flex; }
  .nav-links li{ width: 100%; border-top: 1px solid var(--line); }
  .nav-links a{ display: block; padding: 12px 0; }
}

/* =========================
   Buttons / form controls
   ========================= */
.btn{
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.925rem;
  padding: 12px 20px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--accent);
  background: var(--accent);
  color: #fff;
  cursor: pointer;
  text-decoration: none;
  transition: background 0.15s ease, transform 0.05s ease;
}
.btn:hover{ background: var(--accent-dark); border-color: var(--accent-dark); color: #fff; }
.btn:active{ transform: translateY(1px); }
.btn-ghost{
  background: transparent;
  color: var(--ink);
  border-color: var(--line-strong);
}
.btn-ghost:hover{ background: var(--paper-raised); border-color: var(--ink-soft); color: var(--ink); }
.btn-sm{ padding: 8px 14px; font-size: 0.85rem; }

.field{ margin-bottom: 18px; }
.field label{
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--ink);
}
.field .hint{
  font-size: 0.78rem;
  color: var(--muted);
  margin-top: 5px;
}
.field input[type="number"],
.field input[type="text"],
.field select{
  width: 100%;
  font-family: var(--font-mono);
  font-size: 0.95rem;
  padding: 10px 12px;
  background: var(--paper-raised);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-sm);
  color: var(--ink);
}
.field input:focus, .field select:focus{ border-color: var(--accent); }
.field-row{
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
@media (max-width: 620px){ .field-row{ grid-template-columns: 1fr; } }

.field-error{
  font-size: 0.78rem;
  color: var(--red);
  margin-top: 5px;
  display: none;
}
.field.has-error input, .field.has-error select{ border-color: var(--red); }
.field.has-error .field-error{ display: block; }

/* =========================
   Cards / layout blocks
   ========================= */
.card{
  background: var(--paper-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 28px;
  box-shadow: var(--shadow-card);
}

.tool-shell{
  display: grid;
  grid-template-columns: minmax(280px, 380px) 1fr;
  gap: 32px;
  align-items: start;
}
@media (max-width: 880px){
  .tool-shell{ grid-template-columns: 1fr; }
}

.tool-grid{
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}
@media (max-width: 880px){ .tool-grid{ grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px){ .tool-grid{ grid-template-columns: 1fr; } }

.tool-card{
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 22px;
  background: var(--paper-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  text-decoration: none;
  color: var(--ink);
  transition: border-color 0.15s ease, transform 0.1s ease;
}
.tool-card:hover{ border-color: var(--accent); transform: translateY(-2px); color: var(--ink); }
.tool-card .num{
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent-dark);
  letter-spacing: 0.06em;
}
.tool-card h3{ margin: 0; font-size: 1.15rem; }
.tool-card p{ margin: 0; font-size: 0.9rem; color: var(--muted); }
.tool-card .icon{ width: 30px; height: 30px; color: var(--accent); }

/* =========================
   Ledger result display — signature element
   Tabular rows with dotted leaders, like an account book.
   ========================= */
.ledger{
  background: var(--paper-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  overflow: hidden;
}
.ledger-head{
  padding: 16px 22px;
  background: var(--accent-tint);
  border-bottom: 1px solid var(--line);
  display: flex;
  align-items: baseline;
  justify-content: space-between;
}
.ledger-head .label{
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--accent-dark);
}
.ledger-row{
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 6px 8px;
  padding: 14px 22px;
  border-bottom: 1px solid var(--line);
}
.ledger-row:last-child{ border-bottom: none; }
.ledger-row .rlabel{
  font-size: 0.9rem;
  color: var(--ink-soft);
}
.ledger-row .leader{
  flex: 1;
  min-width: 20px;
  border-bottom: 1px dotted var(--line-strong);
  height: 0;
  transform: translateY(-4px);
}
.ledger-row .rvalue{
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--ink);
  text-decoration: none;
}
@media (max-width: 420px){
  .ledger-row{ padding: 12px 16px; }
  .ledger-row .leader{ display: none; }
  .ledger-row{ justify-content: space-between; }
}
.ledger-row.total .rvalue{
  font-size: 1.3rem;
  color: var(--accent-dark);
}
.ledger-row.total{ background: var(--accent-tint); border-top: 2px solid var(--accent); }
.ledger-foot{
  padding: 14px 22px;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  border-top: 1px solid var(--line);
}

.scenario-cards{
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
@media (max-width: 720px){ .scenario-cards{ grid-template-columns: 1fr; } }
.scenario-card{
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 18px;
  background: var(--paper-raised);
}
.scenario-card.realistic{ border-color: var(--accent); box-shadow: var(--shadow-card); }
.scenario-card .tag{
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
}
.scenario-card .big{
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--ink);
  margin: 6px 0;
}

/* =========================
   Explanatory sections
   ========================= */
.section{ padding: 64px 0; }
.section-tight{ padding: 40px 0; }
.two-col{
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: start;
}
@media (max-width: 820px){ .two-col{ grid-template-columns: 1fr; } }

.faq-item{
  border-bottom: 1px solid var(--line);
  padding: 18px 0;
}
.faq-item summary{
  cursor: pointer;
  font-weight: 600;
  color: var(--ink);
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}
.faq-item summary::-webkit-details-marker{ display: none; }
.faq-item summary::after{
  content: "+";
  font-family: var(--font-mono);
  color: var(--accent-dark);
  font-size: 1.1rem;
}
.faq-item[open] summary::after{ content: "\2212"; }
.faq-item p{ margin-top: 12px; }

.notice{
  border: 1px solid var(--line);
  border-left: 3px solid var(--amber);
  background: var(--amber-tint);
  padding: 16px 18px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  color: #4A3016;
}
.notice strong{ color: #4A3016; }
.notice.accent{ border-left-color: var(--accent); background: var(--accent-tint); color: var(--ink-soft); }

.step-list{
  list-style: none;
  margin: 0; padding: 0;
  counter-reset: step;
}
.step-list li{
  counter-increment: step;
  position: relative;
  padding-left: 40px;
  margin-bottom: 18px;
  color: var(--ink-soft);
}
.step-list li::before{
  content: counter(step);
  position: absolute;
  left: 0; top: 0;
  width: 26px; height: 26px;
  border: 1px solid var(--accent);
  color: var(--accent-dark);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 0.8rem;
}

.table-scroll{
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}
table.compare{
  width: 100%;
  min-width: 420px;
  border-collapse: collapse;
  font-size: 0.9rem;
}
table.compare th, table.compare td{
  text-align: left;
  padding: 10px 12px;
  border-bottom: 1px solid var(--line);
}
table.compare th{
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
  font-weight: 600;
}
table.compare td.num{ font-family: var(--font-mono); font-variant-numeric: tabular-nums; }
table.compare tr.highlight td{ background: var(--accent-tint); font-weight: 600; }

.related-links{
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 10px;
}
.related-links a{
  font-size: 0.85rem;
  padding: 8px 14px;
  border: 1px solid var(--line-strong);
  border-radius: 20px;
  text-decoration: none;
  color: var(--ink-soft);
}
.related-links a:hover{ border-color: var(--accent); color: var(--accent-dark); }

/* =========================
   Hero
   ========================= */
.hero{
  padding: 76px 0 56px;
  border-bottom: 1px solid var(--line);
}
.hero h1{ max-width: 15ch; }
.hero .lede{ margin-top: 18px; margin-bottom: 30px; }
.hero-actions{ display: flex; gap: 14px; flex-wrap: wrap; }

/* =========================
   Footer
   ========================= */
.site-footer{
  border-top: 1px solid var(--line);
  padding: 48px 0 32px;
  margin-top: 40px;
  font-size: 0.88rem;
  color: var(--muted);
}
.footer-grid{
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 32px;
  margin-bottom: 32px;
}
@media (max-width: 720px){ .footer-grid{ grid-template-columns: 1fr 1fr; } }
.footer-grid h4{ font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--ink); margin-bottom: 12px; font-family: var(--font-mono); font-weight: 600;}
.footer-grid ul{ list-style: none; margin: 0; padding: 0; }
.footer-grid li{ margin-bottom: 8px; }
.footer-grid a{ color: var(--muted); text-decoration: none; }
.footer-grid a:hover{ color: var(--accent-dark); }
.footer-legal{
  border-top: 1px solid var(--line);
  padding-top: 20px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px 12px;
}
@media (max-width: 560px){
  .footer-legal{ flex-direction: column; gap: 6px; }
}

/* utility */
.text-center{ text-align: center; }
.mt-0{ margin-top: 0; }
.small{ font-size: 0.82rem; color: var(--muted); }
.visually-hidden{
  position: absolute; width: 1px; height: 1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap;
}

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