/* ==========================================================================
   Boring Tool Site — shared stylesheet
   Mobile-first. Automatic dark mode via prefers-color-scheme. No external deps.
   ========================================================================== */

:root {
  --bg:        #f6f7f9;
  --surface:   #ffffff;
  --surface-2: #f0f2f5;
  --border:    #dde1e7;
  --text:      #1a1d21;
  --text-soft: #555b63;
  --brand:     #1565c0;
  --brand-dk:  #0d47a1;
  --accent:    #00897b;
  --good:      #2e7d32;
  --warn:      #c62828;
  --radius:    10px;
  --shadow:    0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.04);
  --maxw:      720px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg:        #15171a;
    --surface:   #1e2125;
    --surface-2: #262a2f;
    --border:    #353a40;
    --text:      #e6e8eb;
    --text-soft: #a3a9b2;
    --brand:     #5a9fed;
    --brand-dk:  #3d7fc9;
    --accent:    #4db6ac;
    --good:      #66bb6a;
    --warn:      #ef5350;
    --shadow:    0 1px 3px rgba(0,0,0,.4);
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 17px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
}

a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ---- Header / nav ---- */
.site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 10;
}
.site-header .wrap {
  display: flex; align-items: center; gap: 1rem; flex-wrap: wrap;
  max-width: 960px; margin: 0 auto; padding: .6rem 1rem;
}
.logo { font-weight: 700; font-size: 1.15rem; color: var(--text); white-space: nowrap; }
.logo span { color: var(--brand); }
.nav { display: flex; gap: .9rem; flex-wrap: wrap; font-size: .92rem; }
.nav a { color: var(--text-soft); }

/* ---- Layout ---- */
main { max-width: var(--maxw); margin: 0 auto; padding: 1rem 1rem 3rem; }

.breadcrumb { font-size: .82rem; color: var(--text-soft); margin: .4rem 0 1rem; }
.breadcrumb a { color: var(--text-soft); }
.breadcrumb span { margin: 0 .35rem; }

h1 { font-size: 1.6rem; line-height: 1.25; margin: .2rem 0 .4rem; }
.lede { color: var(--text-soft); margin: 0 0 1.2rem; font-size: 1.02rem; }

h2 { font-size: 1.25rem; margin: 1.8rem 0 .6rem; }
h3 { font-size: 1.05rem; margin: 1.2rem 0 .4rem; }

/* ---- Tool card (above the fold) ---- */
.tool {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.5rem;
  margin-bottom: 1rem;
}
.field { margin-bottom: 1.25rem; }
.field label { display: block; font-size: 1.05rem; font-weight: 700; margin-bottom: .45rem; }
.field .hint { font-weight: 400; color: var(--text-soft); font-size: .88rem; }

.input-wrap { position: relative; display: flex; align-items: stretch; }
.input-wrap .affix {
  display: flex; align-items: center; padding: 0 .95rem;
  background: var(--surface-2); border: 1px solid var(--border);
  color: var(--text-soft); font-size: 1.2rem; font-weight: 600;
}
.input-wrap .affix.pre  { border-right: 0; border-radius: 8px 0 0 8px; }
.input-wrap .affix.post { border-left: 0;  border-radius: 0 8px 8px 0; }

input[type="number"], input[type="text"], select {
  width: 100%; padding: .85rem .9rem; font-size: 1.3rem; font-weight: 500;
  color: var(--text); background: var(--surface);
  border: 1px solid var(--border); border-radius: 8px;
  -moz-appearance: textfield;
}
.input-wrap .affix.pre + input  { border-radius: 0 8px 8px 0; }
.input-wrap input:has(+ .affix.post) { border-radius: 8px 0 0 8px; }
input:focus, select:focus { outline: 2px solid var(--brand); outline-offset: -1px; }

.row2 { display: grid; grid-template-columns: 1fr 1fr; gap: .7rem; }
@media (max-width: 460px) { .row2 { grid-template-columns: 1fr; } }

.btn {
  display: inline-block; width: 100%; cursor: pointer;
  background: var(--brand); color: #fff; font-size: 1.2rem; font-weight: 700;
  border: 0; border-radius: 8px; padding: 1rem; margin-top: .3rem;
}
.btn:hover { background: var(--brand-dk); }
.btn.secondary {
  background: transparent; color: var(--brand);
  border: 1px solid var(--border); font-size: .9rem; padding: .55rem;
  width: auto; margin: 0;
}

/* segmented toggle */
.seg { display: flex; border: 1px solid var(--border); border-radius: 8px; overflow: hidden; margin-bottom: .85rem; }
.seg button {
  flex: 1; padding: .55rem; border: 0; cursor: pointer;
  background: var(--surface); color: var(--text-soft); font-size: .9rem; font-weight: 600;
}
.seg button.active { background: var(--brand); color: #fff; }

/* ---- Results ---- */
.result { margin-top: 1rem; padding-top: 1rem; border-top: 1px solid var(--border); }
.result.hidden { display: none; }
.headline {
  font-size: 1.9rem; font-weight: 700; color: var(--brand); line-height: 1.1;
}
.headline-label { font-size: .85rem; color: var(--text-soft); margin-bottom: .15rem; }
.stats { display: grid; grid-template-columns: 1fr 1fr; gap: .6rem; margin-top: 1rem; }
.stat {
  background: var(--surface-2); border-radius: 8px; padding: .65rem .75rem;
}
.stat .k { font-size: .78rem; color: var(--text-soft); }
.stat .v { font-size: 1.15rem; font-weight: 600; }
.v.good { color: var(--good); }
.v.warn { color: var(--warn); }

table.schedule { width: 100%; border-collapse: collapse; margin-top: 1rem; font-size: .88rem; }
table.schedule th, table.schedule td { padding: .45rem .5rem; text-align: right; border-bottom: 1px solid var(--border); }
table.schedule th:first-child, table.schedule td:first-child { text-align: left; }
table.schedule th { color: var(--text-soft); font-weight: 600; }

/* ---- Ad slots ---- */
.ad-slot {
  margin: 1.2rem 0; min-height: 90px;
  display: flex; align-items: center; justify-content: center;
  background: var(--surface-2); border: 1px dashed var(--border); border-radius: 8px;
  color: var(--text-soft); font-size: .75rem; letter-spacing: .08em; text-transform: uppercase;
}
/* Slim leaderboard placed at the top of a tool page (above-the-fold ad). */
.ad-slot.lead { min-height: 60px; margin: .5rem 0 1rem; }

/* ---- Strategy comparison cards (debt payoff result) ---- */
.strategy-grid { display: grid; grid-template-columns: 1fr 1fr; gap: .8rem; margin-top: 1rem; }
@media (max-width: 480px) { .strategy-grid { grid-template-columns: 1fr; } }
.strategy-card {
  background: var(--surface-2); border: 1px solid var(--border);
  border-radius: 10px; padding: 1.1rem;
}
.strategy-card.win { border-color: var(--good); box-shadow: 0 0 0 1px var(--good); }
.strategy-name { font-size: 1.5rem; font-weight: 800; line-height: 1.1; }
.strategy-sub { font-size: .9rem; color: var(--text-soft); margin: .15rem 0 .7rem; }
.strategy-time { font-size: 2rem; font-weight: 800; color: var(--brand); line-height: 1.05; }
.strategy-int {
  margin-top: .7rem; padding-top: .6rem; border-top: 1px solid var(--border);
  display: flex; justify-content: space-between; align-items: baseline;
  font-size: .92rem; color: var(--text-soft);
}
.strategy-int strong { font-size: 1.3rem; font-weight: 700; color: var(--text); }
#verdict { font-size: 1.15rem; }

/* ---- Supporting content ---- */
.content p { margin: .5rem 0; }
.content ol, .content ul { padding-left: 1.3rem; }
.content li { margin: .3rem 0; }

.faq details {
  border: 1px solid var(--border); border-radius: 8px;
  padding: .2rem .9rem; margin-bottom: .5rem; background: var(--surface);
}
.faq summary { cursor: pointer; font-weight: 600; padding: .6rem 0; }
.faq details[open] summary { border-bottom: 1px solid var(--border); margin-bottom: .5rem; }

.related { list-style: none; padding: 0; display: grid; gap: .5rem; }
.related li a {
  display: block; padding: .7rem .9rem; background: var(--surface);
  border: 1px solid var(--border); border-radius: 8px; font-weight: 600;
}
.related li a:hover { border-color: var(--brand); text-decoration: none; }

.note {
  background: var(--surface-2); border-left: 3px solid var(--accent);
  padding: .7rem .9rem; border-radius: 0 8px 8px 0; font-size: .92rem;
  color: var(--text-soft); margin: 1rem 0;
}

/* ---- Homepage grid ---- */
.hero { text-align: center; padding: 1.5rem 0 .5rem; }
.cat { margin: 2rem 0; }
.tool-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: .7rem; }
.tool-grid a {
  display: block; padding: 1rem; background: var(--surface);
  border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow);
}
.tool-grid a:hover { border-color: var(--brand); text-decoration: none; }
.tool-grid .t { font-weight: 700; color: var(--text); }
.tool-grid .d { font-size: .85rem; color: var(--text-soft); margin-top: .2rem; }

/* ---- Footer ---- */
.site-footer {
  border-top: 1px solid var(--border); background: var(--surface);
  color: var(--text-soft); font-size: .85rem;
}
.site-footer .wrap { max-width: 960px; margin: 0 auto; padding: 1.4rem 1rem; }
.site-footer a { color: var(--text-soft); }
.disclaimer { font-size: .78rem; margin-top: .6rem; }