/* ===== Books page — page-specific styles =====
   Reuses tokens from styles.css: --bg, --paper, --navy, --amber, --rule, --serif, --sans, etc.
   Visual idiom: editorial, arena-tinted, navy + amber accent, frame corners.
*/

/* -- Hero ------------------------------------------------------------- */
.bk-hero{
  padding: 28px 0 56px;
  border-bottom: 1px solid var(--rule);
}
.bk-hero-grid{
  display:grid;
  grid-template-columns: 0.95fr 1.05fr;
  gap: 56px;
  align-items: center;
}
.bk-hero-text{ display:flex; flex-direction:column; }
.bk-title{
  font-family: var(--serif);
  font-weight: 400;
  font-size: 56px;
  line-height: 1.05;
  letter-spacing: -0.012em;
  color: var(--navy);
  margin: 4px 0 22px;
}
.bk-title em{ font-style: italic; color: var(--navy-3); font-weight: 400; }
.bk-lede{
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--ink-2);
  max-width: 520px;
  margin: 0 0 18px;
}
.bk-hero-text .ac-rule{
  display:block; width:64px; height:2px; background:var(--amber); margin: 4px 0 28px;
}
.bk-hero-meta{
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  border-top: 1px solid var(--rule);
  padding-top: 20px;
  max-width: 540px;
}
.bk-hero-meta > div{
  display:flex; flex-direction:column; gap: 4px;
  padding-right: 18px;
}
.bk-hero-meta > div + div{
  border-left: 1px solid var(--rule);
  padding-left: 18px;
}
.bk-meta-num{
  font-family: var(--serif);
  font-size: 28px;
  line-height: 1;
  color: var(--navy);
  letter-spacing: -.01em;
}
.bk-meta-lbl{
  font-family: var(--sans);
  font-size: 11px;
  line-height: 1.4;
  font-weight: 600;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--muted);
}

/* -- Hero shelf ------------------------------------------------------- */
.bk-hero-shelf{
  position: relative;
  aspect-ratio: 3/2;
  background: var(--bg-soft);
  border: 1px solid var(--rule);
  overflow: hidden;
}
.bk-hero-shelf.has-img{ background: #2A241A; }
.bk-shelf-img{
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  object-fit: cover;
  display: block;
}
.bk-hero-shelf-tag{
  position: absolute;
  bottom: 22px; left: 22px;
  display:flex; align-items: center; gap: 10px;
  font-family: var(--sans);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--azul-marino);
  background: rgba(250,250,248,.92);
  padding: 7px 12px;
  z-index: 3;
}
.bk-hero-shelf-tag .mono{
  font-family: var(--mono);
  font-weight: 500;
  text-transform: none;
  letter-spacing: 0;
  font-size: 11px;
  color: rgba(11,29,58,.7);
  padding-left: 10px;
  border-left: 1px solid rgba(11,29,58,.25);
}
.bk-shelf-stage{
  position: absolute; inset: 0;
  display: flex; align-items: flex-end; justify-content: center;
  padding: 32px 56px 0;
}
.bk-shelf-spines{
  position: relative; z-index: 2;
  display: flex; align-items: flex-end; gap: 10px;
  height: 78%;
  padding-bottom: 8%;
}
.bk-spine{
  position: relative;
  width: 56px;
  height: 100%;
  display: flex;
  align-items: stretch;
  justify-content: center;
  box-shadow:
    inset 0 0 0 1px rgba(11,29,58,.18),
    -1px 0 0 rgba(11,29,58,.08),
    1px 0 0 rgba(11,29,58,.08),
    0 10px 24px rgba(11,29,58,.18);
  transform-origin: bottom center;
  border-radius: 1px;
}
.bk-spine.light{
  box-shadow:
    inset 0 0 0 1px rgba(11,29,58,.18),
    -1px 0 0 rgba(11,29,58,.08),
    1px 0 0 rgba(11,29,58,.08),
    0 10px 24px rgba(11,29,58,.12);
}
.bk-spine-top{
  position: absolute; top: 0; left: 0; right: 0;
  height: 4px;
  border-bottom: 1px solid;
  opacity: .8;
}
.bk-spine-bottom{
  position: absolute; bottom: 0; left: 0; right: 0;
  height: 4px;
  border-top: 1px solid;
  opacity: .8;
}
.bk-spine-title{
  position: absolute;
  top: 36px; bottom: 64px;
  left: 50%;
  transform: translateX(-50%) rotate(90deg);
  transform-origin: center top;
  font-family: var(--sans);
  font-weight: 600;
  font-size: 14px;
  letter-spacing: .18em;
  text-transform: uppercase;
  white-space: nowrap;
  line-height: 1;
  /* rotate places text vertically along the spine */
  width: max-content;
  margin-top: 0;
  /* simpler: use writing-mode */
}
/* Use writing-mode for clean vertical text instead of rotate above */
.bk-spine-title{
  top: 18px; bottom: 50px; left: 0; right: 0;
  transform: none;
  writing-mode: vertical-rl;
  text-orientation: mixed;
  display: flex; align-items: flex-start; justify-content: center;
  padding: 4px 0;
}
.bk-spine-foot{
  position: absolute;
  bottom: 14px; left: 8px; right: 8px;
  text-align: center;
  font-family: var(--sans);
  font-size: 8.5px;
  font-weight: 700;
  letter-spacing: .14em;
  text-transform: uppercase;
  padding-top: 6px;
  border-top: 1px solid;
  opacity: .85;
}
.bk-shelf-line{
  position: absolute;
  left: 32px; right: 32px;
  bottom: 14%;
  height: 1px;
  background: rgba(11,29,58,.25);
  z-index: 1;
}
.bk-shelf-line::after{
  content: ""; position: absolute; left:0; right:0; top: 1px; height: 18px;
  background: linear-gradient(180deg, rgba(11,29,58,.06) 0%, rgba(11,29,58,0) 100%);
}
.bk-shelf-shadow{
  position: absolute;
  left: 18%; right: 18%;
  bottom: calc(14% - 10px);
  height: 14px;
  background: radial-gradient(50% 100% at 50% 0%, rgba(11,29,58,.32) 0%, rgba(11,29,58,0) 100%);
  z-index: 1;
  filter: blur(2px);
}
.bk-shelf-branch{
  position: absolute;
  right: 36px;
  bottom: 14%;
  width: 78px;
  height: 200px;
  z-index: 3;
}
/* re-use ac-hero-photo frame-corners styling */
.bk-hero-shelf .frame-corners{ position:absolute; inset:14px; pointer-events:none; z-index: 4; }
.bk-hero-shelf .frame-corners span{
  position:absolute; width:16px; height:16px;
  border: 1px solid rgba(250,250,248,.6);
}
.bk-hero-shelf .frame-corners .tl{top:0;left:0;border-right:0;border-bottom:0}
.bk-hero-shelf .frame-corners .tr{top:0;right:0;border-left:0;border-bottom:0}
.bk-hero-shelf .frame-corners .bl{bottom:0;left:0;border-right:0;border-top:0}
.bk-hero-shelf .frame-corners .br{bottom:0;right:0;border-left:0;border-top:0}

/* -- Listing toolbar -------------------------------------------------- */
.bk-listing{ padding-top: 56px; }
.bk-toolbar{
  display:flex; align-items:flex-end; justify-content:space-between;
  gap: 24px;
  margin-bottom: 28px;
  border-bottom: 1px solid var(--rule);
  padding-bottom: 18px;
}
.bk-listing-title{
  font-family: var(--serif);
  font-size: 30px;
  font-weight: 400;
  letter-spacing: -.005em;
  color: var(--navy);
  margin: 0;
}
.bk-toolbar-right{
  display:flex; align-items:center; gap: 16px;
}
.bk-sort{
  position: relative;
  display:flex; align-items:center; gap: 10px;
  font-family: var(--sans); font-size: 13px; color: var(--ink-2);
  font-weight: 500;
}
.bk-sort > span{ color: var(--muted); }
.bk-sort select{
  appearance: none; -webkit-appearance: none;
  background: var(--paper);
  border: 1px solid var(--rule);
  color: var(--navy);
  font: inherit;
  font-weight: 600;
  padding: 8px 32px 8px 12px;
  cursor: pointer;
}
.bk-sort-caret{
  position: absolute; right: 10px; top: 50%;
  width: 14px; height: 14px; transform: translateY(-50%);
  color: var(--navy);
  pointer-events: none;
}
.bk-pill{
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--sans);
  font-size: 13px; font-weight: 600;
  color: var(--navy);
  background: var(--paper);
  border: 1px solid var(--rule);
  padding: 8px 14px;
  transition: background .15s ease, border-color .15s ease, transform .15s ease;
}
.bk-pill svg{ width: 14px; height: 14px; }
.bk-pill:hover{ border-color: var(--navy); background: #fff; transform: translateY(-1px); }

/* -- Book grid -------------------------------------------------------- */
.bk-grid{
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.bk-card{
  display:flex; flex-direction: column;
  background: var(--paper);
  border: 1px solid var(--rule);
  transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
}
.bk-card:hover{
  transform: translateY(-2px);
  border-color: var(--navy);
  box-shadow: 0 8px 24px rgba(11,29,58,.08);
}
.bk-card-cover{
  position: relative;
  display:flex; align-items: center; justify-content: center;
  aspect-ratio: 4/3;
  background:
    linear-gradient(180deg, rgba(11,29,58,.025) 0%, rgba(11,29,58,0) 60%),
    var(--bg);
  border-bottom: 1px solid var(--rule);
  padding: 22px 26px 18px;
  overflow: hidden;
}
.bk-card-cover-inner{
  position: relative;
  height: 100%;
  display:flex; align-items:flex-end; justify-content:center;
}
.bk-card-cover-inner img{
  max-height: 100%;
  max-width: 100%;
  width: auto;
  height: 100%;
  object-fit: contain;
  box-shadow:
    -1px 0 0 rgba(11,29,58,.12),
    0 14px 22px rgba(11,29,58,.18),
    0 4px 8px rgba(11,29,58,.1);
}
.bk-card-cover::after{
  /* shelf line under the book */
  content: "";
  position: absolute;
  left: 18px; right: 18px;
  bottom: 14px;
  height: 1px;
  background: rgba(11,29,58,.18);
}
.bk-card-cover-frame{ position: absolute; inset: 10px; pointer-events:none; }
.bk-card-cover-frame .fc{ position:absolute; width:12px; height:12px; border: 1px solid rgba(11,29,58,.3); }
.bk-card-cover-frame .fc.tl{top:0;left:0;border-right:0;border-bottom:0}
.bk-card-cover-frame .fc.tr{top:0;right:0;border-left:0;border-bottom:0}
.bk-card-cover-frame .fc.bl{bottom:0;left:0;border-right:0;border-top:0}
.bk-card-cover-frame .fc.br{bottom:0;right:0;border-left:0;border-top:0}

.bk-card-body{
  display:flex; flex-direction: column; gap: 10px;
  padding: 18px 20px 18px;
  flex: 1;
}
.bk-card-title{
  font-family: var(--serif); font-weight: 400;
  font-size: 20px; line-height: 1.2;
  color: var(--navy); margin: 0; letter-spacing: -.005em;
}
.bk-card-lede{
  font-family: var(--sans);
  font-size: 13.5px; line-height: 1.55;
  color: var(--ink-2);
  margin: 0;
}
.bk-card-meta{
  display:flex; align-items: center; gap: 8px;
  font-family: var(--sans);
  font-size: 11.5px; font-weight: 600;
  color: var(--muted);
  letter-spacing: .06em;
  margin-top: 4px;
}
.bk-card-meta .dot{ opacity: .6; }
.bk-card-link{
  margin-top: auto;
  padding-top: 12px;
  border-top: 1px solid var(--rule);
}

/* listing foot */
.bk-listing-foot{
  display:flex; justify-content:center;
  padding: 28px 0 0;
}
.bk-ghost-btn{
  display:inline-flex; align-items:center; gap: 10px;
  font-family: var(--sans); font-size: 13px; font-weight: 600;
  color: var(--navy);
  background: transparent;
  border: 1px solid var(--navy);
  padding: 12px 24px;
  cursor: pointer;
  transition: background .15s ease, color .15s ease;
}
.bk-ghost-btn:hover{ background: var(--ink-block); color: var(--on-ink); }
.bk-ghost-btn svg{ width: 14px; height: 14px; }

/* -- Featured (legacy, no longer used) -------------------------------- */
.bk-featured-wrap{
  padding: 56px 0 64px;
}

/* -- Upcoming books -------------------------------------------------- */
.bk-upcoming-wrap{
  padding: 56px 0 64px;
  border-top: 1px solid var(--rule);
  margin-top: 56px;
}
.bk-upcoming-head{
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 40px;
  align-items: end;
  margin-bottom: 36px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--rule);
}
.bk-upcoming-head-left{ display:flex; flex-direction:column; }
.bk-upcoming-title{
  font-family: var(--serif);
  font-weight: 400;
  font-size: 38px;
  line-height: 1.1;
  letter-spacing: -.01em;
  color: var(--navy);
  margin: 6px 0 14px;
}
.bk-upcoming-title em{ font-style: italic; color: var(--navy-3); }
.bk-upcoming-lede{
  font-family: var(--sans);
  font-size: 14.5px;
  line-height: 1.6;
  color: var(--ink-2);
  margin: 0;
  max-width: 620px;
}
.bk-topic-chip{
  display: inline-flex; align-items: baseline; gap: 6px;
  font-family: var(--sans);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .14em;
  text-transform: uppercase;
  padding: 2px 8px;
  border: 1px solid currentColor;
  vertical-align: middle;
  line-height: 1.6;
}
.bk-topic-chip.data    { color: var(--azul-medio); }
.bk-topic-chip.ia      { color: var(--navy); }
.bk-topic-chip.digital { color: var(--amber-2); }

.bk-upcoming-meta{
  list-style: none; padding: 0; margin: 0;
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 0;
  font-family: var(--sans);
  border-left: 1px solid var(--rule);
}
.bk-upcoming-meta li{
  padding: 4px 18px;
  display:flex; flex-direction: column; gap: 4px;
  border-right: 1px solid var(--rule);
}
.bk-upcoming-meta li:last-child{ border-right: 0; }
.bk-upcoming-meta strong{
  font-family: var(--serif);
  font-weight: 400;
  font-size: 24px;
  color: var(--navy);
  letter-spacing: -.01em;
  line-height: 1;
}
.bk-upcoming-meta span{
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--muted);
  line-height: 1.35;
}

.bk-upcoming-foot{
  display: flex;
  justify-content: center;
  padding-top: 32px;
}

/* Grid */
.bk-upcoming-grid{
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}
.bk-up-card{
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  background: var(--paper);
  border: 1px solid var(--rule);
  transition: transform .2s ease, border-color .2s ease, box-shadow .2s ease;
  min-height: 220px;
}
.bk-up-card:hover{
  transform: translateY(-2px);
  border-color: var(--navy);
  box-shadow: 0 8px 22px rgba(11,29,58,.08);
}
.bk-up-spine{
  display:flex; flex-direction: column;
  justify-content: space-between;
  align-items: center;
  padding: 14px 0;
  writing-mode: vertical-rl;
  text-orientation: mixed;
  background: var(--ink-block);
  color: var(--on-ink);
}
.bk-up-spine-id{
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .06em;
  font-weight: 500;
  transform: rotate(180deg);
}
.bk-up-spine-mono{
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: .06em;
  color: rgba(250,250,248,.7);
  transform: rotate(180deg);
}
/* Topic tones — applied as top border accent */
.bk-up-card.tone-navy { border-top: 3px solid var(--navy); }
.bk-up-card.tone-blue { border-top: 3px solid var(--azul-medio); }
.bk-up-card.tone-amber{ border-top: 3px solid var(--amber); }

.bk-up-body{
  display:flex; flex-direction: column;
  padding: 16px 18px 16px;
  gap: 8px;
}
.bk-up-cat{
  font-family: var(--sans);
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--muted);
}
.bk-up-card.tone-navy  .bk-up-cat{ color: var(--navy); }
.bk-up-card.tone-blue  .bk-up-cat{ color: var(--azul-medio); }
.bk-up-card.tone-amber .bk-up-cat{ color: var(--amber-2); }

.bk-up-title{
  font-family: var(--serif);
  font-weight: 400;
  font-size: 19px;
  line-height: 1.2;
  letter-spacing: -.005em;
  color: var(--navy);
  margin: 0;
}
.bk-up-lede{
  font-family: var(--sans);
  font-size: 13px;
  line-height: 1.5;
  color: var(--ink-2);
  margin: 0;
}
.bk-up-foot{
  display:flex; align-items: center; justify-content: space-between;
  gap: 10px;
  margin-top: auto;
  padding-top: 14px;
  border-top: 1px solid var(--rule);
}
.bk-up-when{
  font-family: var(--mono);
  font-size: 11.5px;
  font-weight: 500;
  color: var(--ink-2);
  letter-spacing: .02em;
}
.bk-up-pill{
  display:inline-flex; align-items: center; gap: 6px;
  font-family: var(--sans);
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--navy);
  background: transparent;
  border: 1px solid var(--rule);
  padding: 4px 8px;
}
.bk-up-pill-dot{
  width: 6px; height: 6px;
  background: var(--amber);
  border-radius: 50%;
  box-shadow: 0 0 0 2px rgba(255,199,44,.25);
}

/* -- Featured legacy block reset (so old rules don't accidentally apply) */
.bk-featured{
  display: grid;
  grid-template-columns: 0.95fr 1.4fr 1fr;
  gap: 0;
  background: var(--azul-claro);
  border: 1px solid var(--rule);
  padding: 40px 44px;
  align-items: start;
}
.bk-featured-cover{
  position: relative;
  align-self: stretch;
  display:flex; align-items: flex-end; justify-content: center;
  padding-right: 24px;
}
.bk-featured-cover-inner{
  position: relative;
  width: 100%;
  display:flex; align-items: flex-end; justify-content: center;
}
.bk-featured-cover-inner img{
  width: 92%;
  height: auto;
  display: block;
  box-shadow:
    -2px 0 0 rgba(11,29,58,.18),
    0 22px 30px rgba(11,29,58,.22),
    0 6px 10px rgba(11,29,58,.12);
}
.bk-featured-cover::after{
  content: "";
  position: absolute;
  left: 8px; right: 32px;
  bottom: 0;
  height: 1px;
  background: rgba(11,29,58,.25);
}
.bk-featured-cover-frame{ position: absolute; inset: 0; pointer-events: none; }
.bk-featured-cover-frame .fc{ position:absolute; width:14px; height:14px; border: 1px solid rgba(11,29,58,.4); }
.bk-featured-cover-frame .fc.tl{top:0;left:0;border-right:0;border-bottom:0}
.bk-featured-cover-frame .fc.tr{top:0;right:24px;border-left:0;border-bottom:0}
.bk-featured-cover-frame .fc.bl{bottom:6px;left:0;border-right:0;border-top:0}
.bk-featured-cover-frame .fc.br{bottom:6px;right:24px;border-left:0;border-top:0}

.bk-featured-body{
  padding: 0 32px;
  border-left: 1px solid rgba(11,29,58,.15);
  border-right: 1px solid rgba(11,29,58,.15);
}
.bk-featured-badge{
  display:inline-flex; align-items: center; gap: 8px;
  font-family: var(--sans);
  font-size: 11px; font-weight: 700;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--navy);
  background: var(--paper);
  border: 1px solid var(--navy);
  padding: 6px 10px;
  margin-bottom: 16px;
}
.bk-featured-badge-dot{
  width: 6px; height: 6px; background: var(--amber);
  border-radius: 50%;
  box-shadow: 0 0 0 2px rgba(255,199,44,.25);
}
.bk-featured-title{
  font-family: var(--serif); font-weight: 400;
  font-size: 38px; line-height: 1.1;
  color: var(--navy);
  letter-spacing: -.01em;
  margin: 0 0 8px;
}
.bk-featured-sub{
  font-family: var(--serif);
  font-style: italic;
  font-size: 16px; line-height: 1.4;
  color: var(--ink-2);
  margin: 0 0 18px;
  max-width: 460px;
}
.bk-featured-copy{
  font-family: var(--sans);
  font-size: 14px; line-height: 1.6;
  color: var(--ink-2);
  margin: 0 0 22px;
  max-width: 480px;
}
.bk-featured-pills{
  list-style: none; padding: 0; margin: 0;
  display: grid; grid-template-columns: 1fr;
  gap: 14px;
  padding-top: 18px;
  border-top: 1px solid rgba(11,29,58,.15);
}
.bk-featured-pills li{
  display: grid;
  grid-template-columns: 36px 1fr;
  gap: 14px;
  align-items: start;
}
.bk-pill-ic{
  display:flex; align-items: center; justify-content: center;
  width: 36px; height: 36px;
  background: var(--paper);
  border: 1px solid var(--rule);
  color: var(--navy);
}
.bk-pill-ic svg{ width: 18px; height: 18px; }
.bk-featured-pills li > div{ display:flex; flex-direction: column; gap: 2px; }
.bk-featured-pills strong{
  font-family: var(--sans); font-weight: 600;
  font-size: 13px; color: var(--navy);
}
.bk-featured-pills span{
  font-family: var(--sans); font-size: 12.5px;
  line-height: 1.45;
  color: var(--ink-2);
}

/* meta column */
.bk-featured-meta{
  padding-left: 32px;
  display:flex; flex-direction: column; gap: 16px;
  align-self: stretch;
}
.bk-meta-table{
  margin: 0;
  display: grid; gap: 0;
  font-family: var(--sans);
}
.bk-meta-table > div{
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: 14px;
  padding: 10px 0;
  border-bottom: 1px solid rgba(11,29,58,.12);
  align-items: start;
}
.bk-meta-table > div:first-child{ padding-top: 0; }
.bk-meta-table > div:last-child{ border-bottom: 0; }
.bk-meta-table dt{
  font-size: 12px;
  font-weight: 600;
  color: var(--muted);
  letter-spacing: .04em;
  margin: 0;
}
.bk-meta-table dd{
  font-size: 13px;
  color: var(--ink);
  margin: 0;
  line-height: 1.5;
}
.bk-featured-cta{ margin-top: 6px; justify-content: center; }
.bk-featured-second{
  font-family: var(--sans); font-size: 12.5px;
  text-align: center;
  justify-content: center;
}

/* -- Substack -------------------------------------------------------- */
.bk-substack-wrap{
  padding: 0 0 64px;
}
.bk-substack{
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 24px;
  align-items: center;
  background: var(--azul-claro);
  border: 1px solid var(--rule);
  padding: 22px 28px;
  transition: background .15s ease, transform .15s ease, border-color .15s ease;
}
.bk-substack:hover{ background: #C8DAEC; transform: translateY(-1px); }
.bk-substack-mark{
  display:flex; align-items: center; justify-content: center;
  width: 48px; height: 48px;
  background: var(--ink-block);
}
.bk-substack-mark svg{ width: 24px; height: 24px; }
.bk-substack-text h3{
  font-family: var(--serif);
  font-weight: 400;
  font-size: 19px;
  line-height: 1.25;
  color: var(--navy);
  margin: 0 0 4px;
}
.bk-substack-text p{
  font-family: var(--sans);
  font-size: 13.5px;
  line-height: 1.5;
  color: var(--ink-2);
  margin: 0;
  max-width: 640px;
}
.bk-substack-cta{
  display: inline-flex; align-items: center; gap: 10px;
  font-family: var(--sans);
  font-size: 13px; font-weight: 600;
  color: var(--on-ink);
  background: var(--ink-block);
  padding: 12px 22px;
  white-space: nowrap;
  transition: background .15s ease;
}
.bk-substack-cta svg{ width: 14px; height: 14px; }
.bk-substack:hover .bk-substack-cta{ background: #142D55; }

/* -- Responsive (kept simple — body is min 1240) ----------------- */
@media (max-width: 1100px){
  .bk-hero-grid{ grid-template-columns: 1fr; gap: 32px; }
  .bk-grid{ grid-template-columns: repeat(2, 1fr); }
  .bk-featured{ grid-template-columns: 1fr; gap: 24px; padding: 28px; }
  .bk-featured-body{ border: 0; padding: 0; }
  .bk-featured-meta{ padding-left: 0; }
}
/* Mobile collapse — books.css loads AFTER styles.css, so the ≤640 rules in
   styles.css were being overridden by the base/≤1100 grid declarations here.
   These re-collapse the listings to a single column on phones. */
@media (max-width: 640px){
  .bk-grid{ grid-template-columns: 1fr; }
  .bk-upcoming-head{ grid-template-columns: 1fr; gap: 18px; }
  .bk-upcoming-grid{ grid-template-columns: 1fr; }
  .bk-upcoming-meta{ grid-template-columns: 1fr; border-left: 0; }
  .bk-upcoming-meta li{ border-right: 0; border-bottom: 1px solid var(--rule); }
  .bk-upcoming-meta li:last-child{ border-bottom: 0; }
}