/* ---------------------------------------------------------------
   Constructivist palette: paper, black ink, one red.
   Everything is hard-edged. No rounded corners except the circles.
   --------------------------------------------------------------- */
:root {
  --paper:  #EBE5D9;
  --paper2: #F5F1E8;
  --ink:    #14100E;
  --red:    #D42B1E;
  --grey:   #6E675E;

  --display: "Archivo Black", Haettenschweiler, "Arial Narrow Bold", Impact, sans-serif;
  --ui: "Oswald", "Arial Narrow", "Helvetica Neue", Arial, sans-serif;
}

* { box-sizing: border-box; }

html, body { overflow-x: hidden; }

body {
  margin: 0;
  min-height: 100vh;
  background: var(--paper);
  color: var(--ink);
  font: 400 17px/1.5 var(--ui);
  -webkit-font-smoothing: antialiased;
}

/* --- decorative geometry ---------------------------------------
   Fixed, clipped and pointer-transparent, so it can never sit on
   top of the interface or create a scrollbar.                    */
.bg {
  position: fixed;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
  z-index: 0;
}

.bg-wedge {
  position: absolute;
  top: -30vh;
  left: -21vw;
  width: 33vw;
  height: 82vh;
  background: var(--ink);
  transform: rotate(-19deg);
}

.bg-bar {
  position: absolute;
  bottom: -8vh;
  right: -20vw;
  width: 78vw;
  height: 13vh;
  background: var(--red);
  transform: rotate(-19deg);
}

.bg-circle {
  position: absolute;
  top: 40vh;
  right: -13vw;
  width: 32vw;
  height: 32vw;
  min-width: 240px;
  min-height: 240px;
  border-radius: 50%;
  background: var(--red);
}

.bg-ring {
  position: absolute;
  bottom: 14vh;
  left: 4vw;
  width: 16vw;
  height: 16vw;
  min-width: 120px;
  min-height: 120px;
  border: 10px solid var(--ink);
  border-radius: 50%;
}

/* vertical rail of text down the left edge */
.railtext {
  position: fixed;
  left: 14px;
  top: 50%;
  transform: translateY(-50%) rotate(180deg);
  writing-mode: vertical-rl;
  font: 600 12px/1 var(--ui);
  letter-spacing: .42em;
  text-transform: uppercase;
  color: var(--ink);
  opacity: .55;
  pointer-events: none;
  z-index: 1;
}

/* --- layout ----------------------------------------------------- */
.wrap {
  position: relative;
  z-index: 2;
  max-width: 680px;
  margin: 0 auto;
  padding: 68px 24px 90px 56px;
}

/* --- masthead ---------------------------------------------------- */
.titleblock { margin-bottom: 30px; }

.kicker {
  font: 600 11px/1 var(--ui);
  letter-spacing: .34em;
  text-transform: uppercase;
  color: var(--red);
  margin-bottom: 12px;
}

h1 {
  font-family: var(--display);
  font-weight: 400;
  font-size: clamp(1.85rem, 6vw, 2.7rem);
  line-height: 1.02;
  letter-spacing: -0.02em;
  text-transform: uppercase;
  margin: 0;
}
h1 span { display: inline; }
.t1 { color: var(--ink); }
.t2 { color: var(--red); }
.qm { color: var(--ink); }

.rule {
  height: 5px;
  max-width: 260px;
  margin: 16px 0 14px;
  background: var(--ink);
  /* the red tick that breaks the bar */
  background-image: linear-gradient(90deg, var(--red) 0 44px, transparent 44px);
}

.tagline {
  margin: 0;
  max-width: 46ch;
  font-size: .98rem;
  color: var(--grey);
}

/* --- buttons ------------------------------------------------------ */
.btn {
  font: 600 .95rem/1 var(--ui);
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--ink);
  background: var(--paper2);
  border: 3px solid var(--ink);
  border-radius: 0;
  padding: 15px 26px;
  cursor: pointer;
  box-shadow: 6px 6px 0 var(--ink);
  transition: background .12s, color .12s, transform .08s, box-shadow .12s;
}
.btn:hover { background: var(--ink); color: var(--paper2); }
.btn:active { transform: translate(4px, 4px); box-shadow: 2px 2px 0 var(--ink); }
.btn:focus-visible { outline: 3px solid var(--red); outline-offset: 4px; }

.btn-primary {
  background: var(--red);
  color: var(--paper2);
  font-size: 1.02rem;
  padding: 17px 32px;
  letter-spacing: .18em;
}
.btn-primary:hover { background: var(--ink); color: var(--paper2); }

/* --- help button --------------------------------------------------- */
.help-btn {
  position: fixed;
  top: 22px;
  right: 22px;
  z-index: 5;
  width: 54px;
  height: 54px;
  border-radius: 50%;
  border: 4px solid var(--ink);
  background: var(--paper2);
  color: var(--ink);
  font: 400 1.5rem/1 var(--display);
  cursor: pointer;
  box-shadow: 5px 5px 0 var(--ink);
  transition: background .12s, color .12s, transform .08s, box-shadow .12s;
}
.home-btn {
  right: 90px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.help-btn:hover { background: var(--red); color: var(--paper2); }
.help-btn:active { transform: translate(3px, 3px); box-shadow: 2px 2px 0 var(--ink); }
.help-btn:focus-visible { outline: 3px solid var(--red); outline-offset: 4px; }


/* --- manual date entry ------------------------------------------------- */
.controls {
  display: flex;
  align-items: flex-start;
  gap: 26px;
  flex-wrap: wrap;
}

.picker { position: relative; }

.picker-label {
  display: block;
  font: 600 11px/1 var(--ui);
  letter-spacing: .28em;
  text-transform: uppercase;
  color: var(--grey);
  margin-bottom: 8px;
}

.picker-row {
  display: flex;
  gap: 10px;
}

#pickDate {
  font: 600 .95rem/1 var(--ui);
  letter-spacing: .04em;
  color: var(--ink);
  background: var(--paper2);
  border: 3px solid var(--ink);
  border-radius: 0;
  padding: 13px 12px;
  box-shadow: 6px 6px 0 var(--ink);
  font-variant-numeric: tabular-nums;
}
#pickDate:focus {
  outline: 3px solid var(--red);
  outline-offset: 3px;
}
/* the native picker glyph, recoloured to match the poster */
#pickDate::-webkit-calendar-picker-indicator {
  cursor: pointer;
  filter: grayscale(1) contrast(2);
}

.btn-go { padding: 13px 22px; }

.picker-error {
  margin: 12px 0 0;
  background: var(--red);
  color: var(--paper2);
  font: 600 .82rem/1.35 var(--ui);
  letter-spacing: .05em;
  text-transform: uppercase;
  padding: 9px 12px;
  max-width: 34ch;
}

/* --- date card ------------------------------------------------------ */
.card {
  position: relative;
  margin-top: 40px;
  padding: 34px 28px 30px;
  background: var(--paper2);
  border: 4px solid var(--ink);
  box-shadow: 12px 12px 0 var(--ink);
}

.card-tab {
  position: absolute;
  top: -17px;
  left: 22px;
  background: var(--red);
  color: var(--paper2);
  font: 600 11px/1 var(--ui);
  letter-spacing: .3em;
  text-transform: uppercase;
  padding: 9px 14px;
}

.date-text {
  font-family: var(--display);
  font-size: clamp(1.5rem, 6.4vw, 2.35rem);
  line-height: 1;
  text-transform: uppercase;
  letter-spacing: -0.01em;
  margin-bottom: 26px;
}

.actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

/* --- the answer ------------------------------------------------------ */
.answer {
  margin-top: 28px;
  background: var(--ink);
  color: var(--paper2);
  border-left: 14px solid var(--red);
  font-family: var(--display);
  font-size: clamp(1.9rem, 8vw, 3rem);
  line-height: 1;
  text-transform: uppercase;
  padding: 18px 20px;
}

/* --- the worked steps -------------------------------------------------- */
.work {
  margin-top: 26px;
  border: 3px solid var(--ink);
  background: var(--paper);
  padding: 22px 24px 20px;
}

.work ol {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: step;
}
.work li {
  counter-increment: step;
  position: relative;
  padding: 9px 0 9px 46px;
  border-bottom: 1px solid rgba(20, 16, 14, .18);
}
.work li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: 8px;
  width: 30px;
  height: 30px;
  background: var(--ink);
  color: var(--paper2);
  font: 600 .9rem/30px var(--ui);
  text-align: center;
}

.work .note { color: var(--grey); font-size: .88rem; }

.work .total {
  margin-top: 16px;
  font-family: var(--display);
  font-size: 1.16rem;
  line-height: 1.35;
  text-transform: uppercase;
}
.work .total:first-of-type { padding-top: 14px; }

.num {
  font-family: var(--display);
  font-variant-numeric: tabular-nums;
  color: var(--red);
  font-size: 1.08em;
}

/* --- help modal ---------------------------------------------------------- */
.modal {
  position: fixed;
  inset: 0;
  z-index: 20;
  background: rgba(20, 16, 14, .82);
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 32px 18px;
  overflow-y: auto;
}

.modal-box {
  width: 100%;
  max-width: 580px;
  background: var(--paper2);
  border: 5px solid var(--ink);
  box-shadow: 14px 14px 0 var(--red);
}

.modal-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  background: var(--ink);
  padding: 16px 18px 16px 22px;
}
.modal-head h2 {
  margin: 0;
  font-family: var(--display);
  font-weight: 400;
  font-size: 1.7rem;
  text-transform: uppercase;
  color: var(--paper2);
}

.modal-close {
  flex: none;
  width: 38px;
  height: 38px;
  background: var(--red);
  color: var(--paper2);
  border: 0;
  font: 400 1.5rem/1 var(--ui);
  cursor: pointer;
}
.modal-close:hover { background: var(--paper2); color: var(--ink); }
.modal-close:focus-visible { outline: 3px solid var(--red); outline-offset: 3px; }

.modal-body { padding: 24px 26px 30px; }

.lede {
  margin: 0 0 20px;
  padding-left: 14px;
  border-left: 8px solid var(--red);
  font-size: 1.05rem;
}

.modal-body h3 {
  display: inline-block;
  margin: 28px 0 10px;
  padding: 8px 12px;
  background: var(--ink);
  color: var(--paper2);
  font: 600 .78rem/1 var(--ui);
  letter-spacing: .3em;
  text-transform: uppercase;
}

.steps { margin: 0; padding-left: 22px; }
.steps li { margin: 9px 0; }
.steps strong { text-transform: uppercase; letter-spacing: .04em; }

.tbl {
  width: 100%;
  border-collapse: collapse;
  border: 3px solid var(--ink);
}
.tbl th {
  width: 16%;
  padding: 8px 10px;
  text-align: left;
  background: var(--ink);
  color: var(--paper2);
  font: 600 .9rem/1 var(--ui);
  letter-spacing: .1em;
  text-transform: uppercase;
  border-bottom: 1px solid var(--paper2);
}
.tbl td {
  padding: 8px 10px;
  border-bottom: 1px solid rgba(20, 16, 14, .2);
  font-variant-numeric: tabular-nums;
}
.tbl tr:last-child th,
.tbl tr:last-child td { border-bottom: 0; }

.muted { color: var(--grey); font-size: .86em; }

/* The wedge, ring and high disc need a real gutter beside the 680px content
   column, which only exists past ~1200px once their rotated bounding boxes
   are accounted for. Below that they would run under the
   masthead text, so the poster reduces to the bar plus a corner disc. */
@media (max-width: 1200px) {
  .bg-wedge,
  .bg-ring { display: none; }

  .bg-circle {
    top: auto;
    bottom: 3vh;
    right: -14%;
    width: clamp(200px, 58vw, 360px);
    height: clamp(200px, 58vw, 360px);
    min-width: 0;
    min-height: 0;
  }
}

/* --- narrow screens -------------------------------------------------------- */
@media (max-width: 560px) {
  .railtext { display: none; }
  .wrap { padding: 70px 18px 70px 22px; }
  .card { box-shadow: 8px 8px 0 var(--ink); }
  .actions .btn { flex: 1 1 100%; }
  .controls { gap: 22px; }
  .controls > .btn-primary { width: 100%; }
  .picker { width: 100%; }
  .picker-row { width: 100%; }
  #pickDate { flex: 1 1 auto; min-width: 0; }
}

@media (prefers-reduced-motion: reduce) {
  .btn, .help-btn { transition: none; }
}

/* Utility. !important so it beats component rules like .modal { display: flex }. */
.hidden { display: none !important; }