/* ==========================================================================
   NOIR BARBER — booking page (extends main.css, same design tokens)
   Sections: hero · progress stepper · service step · date/time step ·
             details form · review step · confirmation · sticky summary
   ========================================================================== */

/* ---------- Hero ---------- */
.bk-hero {
  position: relative;
  padding: calc(var(--nav-h) + env(safe-area-inset-top, 0px) + 48px) var(--gutter) 48px;
  border-bottom: 1px solid var(--line);
}
.bk-hero__inner { display: grid; gap: 16px; max-width: 560px; }
.bk-hero__inner .mono { letter-spacing: .18em; }
.bk-hero__title { font: 800 clamp(2.6rem, 7vw, 4.4rem)/1 var(--f-display); }
.bk-hero__sub { color: var(--ash); font-size: 1.0625rem; line-height: 1.6; max-width: 42ch; }

/* ---------- Progress stepper ---------- */
.bk-steps {
  --progress: 0%;
  display: flex; align-items: stretch; gap: 0;
  margin-bottom: clamp(40px, 6vw, 72px);
  border-bottom: 1px solid var(--line);
  position: relative;
  scroll-margin-top: calc(var(--nav-h) + 20px);
}
#panelConfirm { scroll-margin-top: calc(var(--nav-h) + 20px); }
.bk-steps::after {
  content: ""; position: absolute; inset-inline-start: 0; bottom: -1px; height: 2px;
  width: var(--progress); background: var(--bronze); transition: width .5s var(--ease-out);
}
.bk-steps__item {
  flex: 1 1 0; display: flex; align-items: center; gap: 10px;
  padding-block: 16px; color: var(--ash); min-width: 0;
}
.bk-steps__n { font: 700 .8125rem/1 var(--f-mono); flex: none; }
.bk-steps__label { font: 500 .8125rem/1 var(--f-body); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.bk-steps__item[data-state="current"] { color: var(--ivory); }
.bk-steps__item[data-state="current"] .bk-steps__n { color: var(--bronze-hi); }
.bk-steps__item[data-state="done"] { color: var(--bronze-hi); }
.bk-steps__item[data-state="done"] .bk-steps__n::before { content: "✓"; }
.bk-steps__item[data-state="done"] .bk-steps__n { font-size: 0; }
.bk-steps__item[data-state="done"] .bk-steps__n::before { font-size: .8125rem; }

/* ---------- Grid: main column + sticky summary ---------- */
.bk-grid { display: grid; grid-template-columns: minmax(0, 1fr); gap: clamp(32px, 5vw, 56px); }
.bk-panel[hidden] { display: none; }
.bk-panel { animation: fadeUp .5s var(--ease-out); }
.bk-panel__hint { color: var(--ash); margin-top: 8px; max-width: 46ch; }

/* ---------- Step 1: service ---------- */
.bk-selected {
  border: 1px solid var(--line-strong); background: var(--tobacco);
  padding: 28px clamp(20px, 4vw, 32px); display: grid; gap: 10px; justify-items: start;
}
.bk-selected__name { font: 700 1.5rem/1.25 var(--f-display); }
.bk-selected__meta { color: var(--bronze-hi); font: 500 .9375rem/1 var(--f-body); }

.bk-svc-list { margin-top: 24px; border-top: 1px solid var(--line-strong); }
.bk-svc { border-bottom: 1px solid var(--line); }
.bk-svc__row {
  width: 100%; display: grid; grid-template-columns: auto 1fr auto auto; align-items: center;
  gap: 16px; padding: 18px 4px; cursor: pointer; text-align: start;
  transition: background .25s;
}
.bk-svc__row:hover, .bk-svc__row:focus-visible { background: rgba(237, 230, 218, .03); }
.bk-svc__check {
  display: inline-flex; align-items: center; justify-content: center; flex: none;
  width: 22px; height: 22px; border-radius: 999px; border: 1px solid var(--line-strong);
  color: transparent; font-size: .7rem; transition: border-color .3s, color .3s, background .3s;
}
.bk-svc.is-selected .bk-svc__check { background: var(--bronze); border-color: var(--bronze); color: var(--soot); }
.bk-svc.is-selected .bk-svc__name { color: var(--bronze-hi); }
.bk-svc__name { font: 600 1.0625rem/1.3 var(--f-body); }
.bk-svc__time { color: var(--ash); font: 500 .8125rem/1 var(--f-body); letter-spacing: normal; white-space: nowrap; }
.bk-svc__price { font: 600 1rem/1 var(--f-mono); white-space: nowrap; }
.bk-svc__row:focus-visible { outline: 2px solid var(--bronze-hi); outline-offset: -2px; }

/* ---------- Step 2: month calendar + time ---------- */
.cal { margin-top: 20px; max-width: 420px; }
.cal__head { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 16px; }
.cal__label { font: 700 1.0625rem/1 var(--f-display); }
.cal__nav {
  flex: none; width: 38px; height: 38px; display: inline-flex; align-items: center; justify-content: center;
  border: 1px solid var(--line-strong); color: var(--ivory); transition: border-color .25s, color .25s, opacity .25s;
}
.cal__nav:hover, .cal__nav:focus-visible { border-color: var(--bronze); color: var(--bronze-hi); }
.cal__nav:disabled { opacity: .25; pointer-events: none; }
.cal__weekdays { display: grid; grid-template-columns: repeat(7, 1fr); gap: 4px; margin-bottom: 6px; }
.cal__weekdays span { text-align: center; font: 600 .6875rem/1 var(--f-body); color: var(--ash); }
.cal__grid { display: grid; grid-template-columns: repeat(7, 1fr); gap: 4px; }
.cal__day {
  aspect-ratio: 1; display: flex; align-items: center; justify-content: center;
  font: 600 .9375rem/1 var(--f-mono); color: var(--ivory); border: 1px solid transparent;
  transition: border-color .25s, background .25s, color .25s, opacity .25s;
}
.cal__day:hover, .cal__day:focus-visible { border-color: var(--bronze); }
.cal__day.is-selected { background: var(--bronze); color: var(--soot); }
.cal__day.is-today:not(.is-selected) { border-color: var(--line-strong); color: var(--bronze-hi); }
.cal__day.is-out { color: var(--ash); opacity: .3; }
.cal__day.is-closed:not(.is-selected) { opacity: .4; }
.cal__day:disabled { opacity: .2; pointer-events: none; }
.cal__day.is-empty { visibility: hidden; pointer-events: none; }

.bk-slots-wrap { margin-top: 36px; }
.bk-slots-label { font: 600 .8125rem/1 var(--f-body); color: var(--ash); margin-bottom: 16px; }
.bk-slots { display: grid; grid-template-columns: repeat(auto-fill, minmax(84px, 1fr)); gap: 10px; }
.slot {
  min-height: 48px; border: 1px solid var(--line-strong); font: 600 .875rem/1 var(--f-mono);
  transition: border-color .25s, background .25s, color .25s, opacity .25s;
}
.slot:hover, .slot:focus-visible { border-color: var(--bronze); color: var(--bronze-hi); }
.slot.is-selected { background: var(--bronze); border-color: var(--bronze); color: var(--soot); }
.slot.is-unavailable { opacity: .28; text-decoration: line-through; cursor: not-allowed; }

.bk-empty { padding: 40px 0; text-align: center; display: grid; gap: 8px; justify-items: center; }
.bk-empty__title { font: 700 1.125rem/1.4 var(--f-display); }
.bk-empty__text { color: var(--ash); }

/* ---------- Step 3: details form ---------- */
.bk-form { margin-top: 24px; display: grid; gap: 22px; max-width: 480px; }
.field { display: grid; gap: 8px; }
.field label { font: 600 .875rem/1 var(--f-body); }
.field input, .field textarea {
  width: 100%; background: var(--tobacco); border: 1px solid var(--line-strong); color: var(--ivory);
  padding: 14px 16px; font: 400 1rem/1.5 var(--f-body); transition: border-color .25s;
}
.field input::placeholder, .field textarea::placeholder { color: var(--ash); opacity: .7; }
.field input:focus-visible, .field textarea:focus-visible { border-color: var(--bronze); outline: none; }
.field input[aria-invalid="true"], .field textarea[aria-invalid="true"] { border-color: #c0604a; }
.field__err { color: #e08a72; font: 500 .8125rem/1.4 var(--f-body); min-height: 1em; }
.field textarea { resize: vertical; min-height: 90px; }

/* ---------- Step 4: review ---------- */
.bk-review { display: grid; gap: 0; margin-top: 24px; border-top: 1px solid var(--line-strong); }
.bk-review__row {
  display: flex; align-items: baseline; justify-content: space-between; gap: 20px;
  padding: 18px 0; border-bottom: 1px solid var(--line);
}
.bk-review__row dt { color: var(--ash); font: 500 .8125rem/1 var(--f-body); flex: none; }
.bk-review__row dd { font: 600 1rem/1.4 var(--f-body); text-align: end; }
.bk-review__edit { font: 600 .75rem/1 var(--f-body); color: var(--bronze-hi); flex: none; }
.bk-review__edit:hover { text-decoration: underline; }

/* ---------- Confirmation ---------- */
.bk-confirm { text-align: center; display: grid; justify-items: center; gap: 14px; padding-block: 24px 8px; max-width: 480px; margin-inline: auto; }
.bk-confirm__check {
  width: 64px; height: 64px; border-radius: 999px; background: var(--bronze); color: var(--soot);
  display: flex; align-items: center; justify-content: center; font-size: 1.75rem; margin-bottom: 6px;
}
.bk-confirm__title { font: 800 clamp(1.75rem, 4vw, 2.5rem)/1.2 var(--f-display); }
.bk-confirm__list { display: grid; gap: 0; width: 100%; margin-top: 12px; border-top: 1px solid var(--line); }
.bk-confirm__list > div { display: flex; justify-content: space-between; padding: 14px 4px; border-bottom: 1px solid var(--line); }
.bk-confirm__list dt { color: var(--ash); font: 500 .8125rem/1 var(--f-body); }
.bk-confirm__list dd { font: 600 1rem/1 var(--f-body); }
.bk-confirm__ref { margin-top: 8px; color: var(--bronze-hi); font: 600 .9375rem/1 var(--f-body); }
.bk-confirm__note { color: var(--ash); }
.bk-confirm__actions { display: flex; flex-wrap: wrap; justify-content: center; gap: 14px; margin-top: 16px; width: 100%; }

/* ---------- Sticky summary: mobile bottom bar ---------- */
.bk-summary {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 45;
  padding: 14px var(--gutter) calc(14px + env(safe-area-inset-bottom, 0px));
  background: rgba(15, 13, 11, .94); -webkit-backdrop-filter: blur(14px); backdrop-filter: blur(14px);
  border-top: 1px solid var(--line-strong);
}
.bk-summary[hidden] { display: none; }
.bk-summary__inner { display: flex; align-items: center; justify-content: space-between; gap: 16px; max-width: var(--maxw); margin-inline: auto; }
.bk-summary__info { display: grid; gap: 2px; min-width: 0; }
.bk-summary__name { font: 700 1.0625rem/1.25 var(--f-display); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.bk-summary__meta { font: 400 .8125rem/1 var(--f-body); color: var(--bronze-hi); }
.bk-summary__datetime { color: var(--ash); }
.bk-summary__actions { display: flex; align-items: center; gap: 10px; flex: none; }

/* ==========================================================================
   Tablet ≥ 700px
   ========================================================================== */
@media (min-width: 700px) {
  .bk-steps__label { white-space: normal; }
}

/* ==========================================================================
   Desktop ≥ 1000px — summary becomes a sticky side panel, not a fixed bar
   ========================================================================== */
@media (min-width: 1000px) {
  .bk-hero { padding-top: calc(var(--nav-h) + 80px); padding-bottom: 72px; }
  .bk { padding-top: clamp(56px, 8vw, 100px); }

  .bk-grid { grid-template-columns: 1fr 340px; align-items: start; }
  .bk-col-main { min-width: 0; }

  .bk-summary {
    position: sticky; inset: auto; top: calc(var(--nav-h) + 24px); z-index: 1;
    padding: 28px; background: var(--tobacco); border: 1px solid var(--line-strong); border-top: 1px solid var(--line-strong);
    backdrop-filter: none; -webkit-backdrop-filter: none;
  }
  .bk-summary__inner { flex-direction: column; align-items: stretch; gap: 20px; }
  .bk-summary__actions { flex-direction: column-reverse; }
  .bk-summary__actions .btn { width: 100%; }

  .bk-slots { grid-template-columns: repeat(auto-fill, minmax(96px, 1fr)); }
}