/* ==========================================================================
   Nexgen Placement — interview booking
   No frameworks, no external fonts, no gradients. Works down to 320px.
   ========================================================================== */

:root {
  /* Neutrals */
  --page:        #f6f7f8;
  --surface:     #ffffff;
  --ink:         #16202a;
  --ink-soft:    #5a6873;
  --line:        #e1e6ea;
  --line-strong: #cfd7de;

  /* Single accent hue, used at four strengths for the demand scale */
  --accent:      #1b4965;
  --accent-deep: #123548;
  --tint-high:   #f2f6f8;
  --tint-medium: #dce8ef;
  --tint-low:    #bed3e0;
  --tint-border-high:   #dce4ea;
  --tint-border-medium: #bcd2de;
  --tint-border-low:    #93b5c8;

  --danger:      #8c2f2f;
  --danger-tint: #fbefee;
  --ok:          #1d6b53;

  --radius: 8px;
  --radius-lg: 12px;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--page);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
               "Helvetica Neue", Arial, "Noto Sans", sans-serif;
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

.wrap {
  width: 100%;
  max-width: 68rem;
  margin: 0 auto;
  padding-left: 1rem;
  padding-right: 1rem;
}

.is-hidden { display: none !important; }

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--accent);
  color: #fff;
  padding: 0.6rem 1rem;
  z-index: 10;
  border-radius: 0 0 var(--radius) 0;
}
.skip-link:focus { left: 0; }

/* ------------------------------- header --------------------------------- */

.site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--line);
}

.brand {
  margin: 0;
  padding: 1rem 0;
  font-size: 1rem;
  font-weight: 650;
  letter-spacing: -0.01em;
}

/* -------------------------------- intro --------------------------------- */

.intro { padding: 2.25rem 0 1.5rem; }

.intro h1 {
  margin: 0 0 0.5rem;
  font-size: 1.875rem;
  line-height: 1.2;
  letter-spacing: -0.021em;
  font-weight: 660;
}

.intro__sub {
  margin: 0;
  max-width: 44rem;
  color: var(--ink-soft);
  font-size: 1rem;
}

/* -------------------------------- cards --------------------------------- */

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
}

.card__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1rem;
}

.card__title {
  margin: 0 0 1rem;
  font-size: 1.0625rem;
  font-weight: 640;
  letter-spacing: -0.008em;
}

.card__head .card__title { margin-bottom: 0; }

/* ---------------------------- booking layout ---------------------------- */

.booking {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  align-items: start;
}

@media (min-width: 56rem) {
  .booking {
    grid-template-columns: minmax(20rem, 24rem) 1fr;
  }
}

.form-card,
.done-card {
  margin-top: 1rem;
  max-width: 38rem;
}

/* ------------------------------- calendar ------------------------------- */

.cal__bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}

.cal__month {
  margin: 0;
  font-size: 0.9375rem;
  font-weight: 620;
  text-align: center;
  flex: 1;
}

.iconbtn {
  width: 2.25rem;
  height: 2.25rem;
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--ink);
  font-size: 1.25rem;
  line-height: 1;
  cursor: pointer;
}

.iconbtn:hover:not(:disabled) { border-color: var(--accent); }
.iconbtn:disabled { opacity: 0.35; cursor: not-allowed; }

.cal__dow,
.cal__grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 0.25rem;
}

.cal__dow {
  margin-bottom: 0.25rem;
}

.cal__dow span {
  text-align: center;
  font-size: 0.75rem;
  color: var(--ink-soft);
  padding: 0.25rem 0;
}

.cal__cell { aspect-ratio: 1 / 1; }

.day {
  width: 100%;
  height: 100%;
  min-height: 2.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid transparent;
  border-radius: var(--radius);
  background: transparent;
  color: var(--ink-soft);
  font: inherit;
  font-size: 0.9375rem;
  font-variant-numeric: tabular-nums;
  cursor: not-allowed;
}

.day--open {
  background: var(--tint-high);
  border-color: var(--tint-border-high);
  color: var(--ink);
  font-weight: 600;
  cursor: pointer;
}

.day--open:hover { border-color: var(--accent); }

.day--selected,
.day--open[aria-pressed="true"] {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.day--empty { visibility: hidden; }

.hint {
  margin: 0.875rem 0 0;
  font-size: 0.8125rem;
  color: var(--ink-soft);
}

/* -------------------------------- slots --------------------------------- */

.slots {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(6.5rem, 1fr));
  gap: 0.5rem;
  min-height: 3rem;
}

.slot {
  padding: 0.7rem 0.4rem;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--ink);
  font: inherit;
  font-weight: 580;
  font-variant-numeric: tabular-nums;
  text-align: center;
  cursor: pointer;
}

/* Demand scale: one hue, three strengths. Never red or orange. */
.slot--high {
  background: var(--tint-high);
  border-color: var(--tint-border-high);
}
.slot--medium {
  background: var(--tint-medium);
  border-color: var(--tint-border-medium);
}
.slot--low {
  background: var(--tint-low);
  border-color: var(--tint-border-low);
}

.slot:hover:not(:disabled) { border-color: var(--accent); }

.slot[aria-pressed="true"] {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  box-shadow: inset 0 0 0 1px var(--accent-deep);
}

.slot:disabled { opacity: 0.55; cursor: progress; }

/* -------------------------------- legend -------------------------------- */

.legend {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  margin-top: 1.125rem;
  padding-top: 0.875rem;
  border-top: 1px solid var(--line);
  font-size: 0.8125rem;
  color: var(--ink-soft);
}

.legend__label { font-weight: 600; color: var(--ink); }

.legend__scale { display: inline-flex; gap: 0.1875rem; }

.swatch {
  width: 1.125rem;
  height: 0.75rem;
  border-radius: 3px;
  border: 1px solid var(--line-strong);
  display: inline-block;
}
.swatch--high   { background: var(--tint-high);   border-color: var(--tint-border-high); }
.swatch--medium { background: var(--tint-medium); border-color: var(--tint-border-medium); }
.swatch--low    { background: var(--tint-low);    border-color: var(--tint-border-low); }

/* ------------------------------- messages ------------------------------- */

.alert {
  margin: 0 0 1rem;
  padding: 0.7rem 0.85rem;
  border-radius: var(--radius);
  font-size: 0.9375rem;
  border: 1px solid transparent;
}

.alert--info {
  background: var(--tint-high);
  border-color: var(--tint-border-medium);
  color: var(--accent-deep);
}

.alert--error,
#globalAlert {
  background: var(--danger-tint);
  border-color: #e8cbc9;
  color: var(--danger);
}

.muted {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.9375rem;
}

.linkbtn {
  border: 0;
  background: none;
  padding: 0;
  font: inherit;
  font-size: 0.875rem;
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 2px;
  cursor: pointer;
}

.linkbtn:disabled { opacity: 0.5; cursor: progress; }

.chosen {
  margin: 0 0 1.25rem;
  padding: 0.75rem 0.85rem;
  border-radius: var(--radius);
  background: var(--tint-high);
  border: 1px solid var(--tint-border-medium);
  color: var(--accent-deep);
  font-weight: 560;
}

/* -------------------------------- fields -------------------------------- */

.field { margin-bottom: 1.125rem; }

.field__label {
  display: block;
  margin-bottom: 0.3rem;
  font-size: 0.9375rem;
  font-weight: 570;
}

.req { color: var(--danger); }
.opt { font-weight: 400; color: var(--ink-soft); }

.field__input {
  width: 100%;
  padding: 0.625rem 0.7rem;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--ink);
  font: inherit;
  font-size: 1rem;
}

.field__input:focus { border-color: var(--accent); }

.field__input--area { resize: vertical; min-height: 4.5rem; }

.field__input.has-error { border-color: var(--danger); }

.field__hint {
  margin: 0.3rem 0 0;
  font-size: 0.8125rem;
  color: var(--ink-soft);
}

.field__error {
  margin: 0.3rem 0 0;
  font-size: 0.8125rem;
  color: var(--danger);
}

/* ------------------------------- actions -------------------------------- */

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.25rem;
}

.btn {
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius);
  border: 1px solid transparent;
  font: inherit;
  font-weight: 590;
  cursor: pointer;
}

.btn--primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}
.btn--primary:hover:not(:disabled) {
  background: var(--accent-deep);
  border-color: var(--accent-deep);
}
.btn--primary:disabled { opacity: 0.62; cursor: progress; }

.btn--ghost {
  background: transparent;
  border-color: var(--line-strong);
  color: var(--ink-soft);
}
.btn--ghost:hover:not(:disabled) { border-color: var(--ink); color: var(--ink); }
.btn--ghost:disabled { opacity: 0.5; cursor: not-allowed; }

/* ----------------------------- confirmation ----------------------------- */

.done-card { border-color: var(--ok); }

.done__tick {
  margin: 0 0 0.35rem;
  font-size: 1.75rem;
  line-height: 1;
  color: var(--ok);
}

.done__title {
  margin: 0 0 1.125rem;
  font-size: 1.4375rem;
  letter-spacing: -0.016em;
  font-weight: 650;
}

.done__list { margin: 0; }

.done__row {
  display: grid;
  grid-template-columns: 7rem 1fr;
  gap: 0.5rem;
  padding: 0.5rem 0;
  border-top: 1px solid var(--line);
}

.done__row dt {
  color: var(--ink-soft);
  font-size: 0.9375rem;
}

.done__row dd {
  margin: 0;
  font-weight: 560;
  overflow-wrap: anywhere;
}

.done__row dd a { color: var(--accent); }

.done__note {
  margin: 1.125rem 0 0;
  font-size: 0.9375rem;
  color: var(--ink-soft);
}

.done__ref {
  margin: 0.875rem 0 0;
  font-size: 0.8125rem;
  color: var(--ink-soft);
  font-variant-numeric: tabular-nums;
}

@media (max-width: 26rem) {
  .done__row { grid-template-columns: 1fr; gap: 0.1rem; }
}

/* -------------------------------- footer -------------------------------- */

.site-footer {
  margin-top: 2.5rem;
  padding: 1.25rem 0 2.5rem;
  color: var(--ink-soft);
  font-size: 0.8125rem;
}
.site-footer p { margin: 0; }

/* ----------------------------- interaction ------------------------------ */

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* Keep focus visible against the solid selected state */
.slot[aria-pressed="true"]:focus-visible,
.day--selected:focus-visible,
.btn--primary:focus-visible {
  outline-color: var(--ink);
}

[aria-busy="true"] { cursor: progress; }

/* ------------------------------ small screens --------------------------- */

@media (max-width: 22.5rem) {
  .wrap { padding-left: 0.75rem; padding-right: 0.75rem; }
  .card { padding: 1rem 0.875rem; }
  .intro h1 { font-size: 1.625rem; }
  .slots { grid-template-columns: repeat(auto-fill, minmax(5.25rem, 1fr)); }
  .day { min-height: 2.25rem; font-size: 0.875rem; }
}