:root {
  --bg: #f6f7f9; --panel: #fff; --ink: #14181d; --ink-soft: #5b6672;
  --line: #e2e6eb; --accent: #2f6df6; --accent-soft: #e8effe;
  --up: #12855b; --up-soft: #e3f5ec;
  --down: #c0392b; --down-soft: #fceceb;
  --warn: #a5670a; --warn-soft: #fdf1dc;
  --shadow: 0 1px 2px rgba(16,24,40,.06), 0 8px 24px rgba(16,24,40,.06);
  --radius: 14px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1216; --panel: #171b21; --ink: #e9edf2; --ink-soft: #9aa6b2;
    --line: #262c34; --accent: #6b9bff; --accent-soft: #1b2740;
    --up: #4ecf9a; --up-soft: #12281f;
    --down: #ff7b6b; --down-soft: #2b1614;
    --warn: #e8b44f; --warn-soft: #2c2213;
    --shadow: 0 1px 2px rgba(0,0,0,.4), 0 8px 24px rgba(0,0,0,.35);
  }
}
* { box-sizing: border-box; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 15px/1.55 -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
#app { max-width: 1120px; margin: 0 auto; padding: 34px 20px 60px; }

.top { display: flex; align-items: flex-start; gap: 16px; flex-wrap: wrap; }
.brand h1 { margin: 0; font-size: 30px; letter-spacing: -.02em; }
.brand .sub { margin: 5px 0 0; color: var(--ink-soft); }
.head-right { margin-left: auto; display: flex; align-items: center; gap: 12px; }
.summary { font-size: 13px; color: var(--ink-soft); font-variant-numeric: tabular-nums; }
.btn {
  border: 1px solid var(--line); background: var(--panel); color: var(--ink);
  border-radius: 999px; padding: 7px 16px; font-size: 13px; font-weight: 600; cursor: pointer;
}
.btn:hover { border-color: var(--accent); color: var(--accent); }
.btn:disabled { opacity: .5; cursor: default; }

.filter {
  width: 100%; margin: 22px 0 18px; padding: 11px 16px; font-size: 15px;
  background: var(--panel); color: var(--ink);
  border: 1px solid var(--line); border-radius: 999px; outline: 0;
}
.filter:focus { border-color: var(--accent); box-shadow: 0 0 0 4px var(--accent-soft); }

.grid { display: grid; gap: 14px; grid-template-columns: repeat(auto-fill, minmax(290px, 1fr)); }

.card {
  display: flex; flex-direction: column; gap: 9px;
  background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 16px 17px 15px; box-shadow: var(--shadow);
  text-decoration: none; color: inherit;
  transition: transform .14s ease, border-color .14s ease;
}
.card:hover { transform: translateY(-2px); border-color: var(--accent); }
.card.is-down { opacity: .72; }
.card.is-down:hover { transform: none; border-color: var(--down); }

.card .row { display: flex; align-items: center; gap: 10px; }
.card .icon { font-size: 24px; line-height: 1; }
.card h2 { margin: 0; font-size: 16.5px; font-weight: 660; letter-spacing: -.01em; }
.card .tagline { font-size: 12px; color: var(--ink-soft); }
.card .desc { font-size: 13.5px; color: var(--ink-soft); flex: 1; }

.status { margin-left: auto; display: flex; align-items: center; gap: 6px; font-size: 12px; font-weight: 600; }
.dot { width: 9px; height: 9px; border-radius: 50%; flex: none; }
.status.up   { color: var(--up); }   .status.up .dot   { background: var(--up); }
.status.down { color: var(--down); } .status.down .dot { background: var(--down); }
.status.error{ color: var(--warn); } .status.error .dot{ background: var(--warn); }
.status.checking { color: var(--ink-soft); }
.status.checking .dot { background: var(--ink-soft); animation: pulse 1s ease-in-out infinite; }
@keyframes pulse { 50% { opacity: .3; } }
@media (prefers-reduced-motion: reduce) {
  .status.checking .dot { animation: none; }
  .card:hover { transform: none; }
}

.meta { display: flex; align-items: center; gap: 8px; flex-wrap: wrap;
        border-top: 1px solid var(--line); padding-top: 10px; font-size: 12px; color: var(--ink-soft); }
.meta code { font-size: 11.5px; background: var(--bg); padding: 2px 7px; border-radius: 5px; }
.tags { display: flex; gap: 5px; flex-wrap: wrap; margin-left: auto; }
.tag { font-size: 11px; background: var(--accent-soft); color: var(--accent);
       border-radius: 999px; padding: 2px 9px; font-weight: 600; }

.hint { font-size: 12px; color: var(--down); background: var(--down-soft);
        border-radius: 8px; padding: 7px 11px; }

.empty { text-align: center; color: var(--ink-soft); padding: 40px 10px; }
.foot { margin-top: 40px; text-align: center; font-size: 12px; color: var(--ink-soft); }
.foot code { background: var(--panel); padding: 2px 6px; border-radius: 5px; border: 1px solid var(--line); }

/* ---------- book promo ---------------------------------------------------
   Sits above the tiles because the site is the book's namesake and the tiles
   are the evidence for its claim, not a separate topic. */
.book {
  display: flex; gap: 26px; align-items: center; flex-wrap: wrap;
  background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 24px 26px; margin: 24px 0 4px; box-shadow: var(--shadow);
  position: relative; overflow: hidden;
}
.book::before {
  content: ""; position: absolute; inset: 0 auto 0 0; width: 4px;
  background: linear-gradient(180deg, var(--accent), transparent);
}

.book-covers { flex: none; display: flex; gap: 12px; }
.cover { text-decoration: none; display: flex; flex-direction: column; gap: 6px; align-items: center; }
.cover img {
  width: 130px; height: auto; display: block; border-radius: 6px;
  box-shadow: 0 10px 26px rgba(16, 24, 40, .34);
  transition: transform .16s ease, box-shadow .16s ease;
}
.cover:hover img { transform: translateY(-3px); box-shadow: 0 14px 32px rgba(16, 24, 40, .44); }
.cover span {
  font-size: 11.5px; font-weight: 650; color: var(--ink-soft); letter-spacing: .03em;
}
.cover:hover span { color: var(--accent); }

.book-body { flex: 1; min-width: 280px; }
.book-eyebrow {
  margin: 0 0 4px; font-size: 11px; text-transform: uppercase; letter-spacing: .08em;
  color: var(--accent); font-weight: 700;
}
.book h2 { margin: 0; font-size: 21px; letter-spacing: -.01em; }
.book-by { margin: 3px 0 12px; color: var(--ink-soft); font-size: 13.5px; }
.book-pitch { margin: 0 0 16px; font-size: 14.5px; line-height: 1.6; color: var(--ink-soft); max-width: 62ch; }
.book-pitch strong { color: var(--ink); font-weight: 650; }

.book-editions { display: grid; gap: 12px; }
.edition { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.ed-name {
  min-width: 132px; font-size: 13px; font-weight: 650; color: var(--ink);
}
.ed-formats { display: flex; gap: 8px; flex-wrap: wrap; }
.buy {
  text-decoration: none; font-size: 13px; font-weight: 600;
  background: var(--panel); color: var(--ink); border: 1px solid var(--line);
  border-radius: 999px; padding: 7px 16px; transition: border-color .14s ease, color .14s ease;
}
.buy:hover { border-color: var(--accent); color: var(--accent); }
/* Kindle gets the emphasis: it is the free-with-Unlimited route. */
.buy.kindle { background: var(--accent); border-color: var(--accent); color: #fff; }
.buy.kindle:hover { color: #fff; opacity: .9; }

.book-formats {
  margin: 15px 0 0; font-size: 12.5px; color: var(--ink-soft);
  display: flex; align-items: center; gap: 8px; flex-wrap: wrap;
}
.ku {
  background: var(--accent-soft); color: var(--accent); font-weight: 700;
  font-size: 11px; letter-spacing: .04em; border-radius: 999px; padding: 3px 10px;
}

@media (max-width: 620px) {
  .book { gap: 18px; padding: 20px; }
  .cover img { width: 104px; }
}