* {
  box-sizing: border-box;
}

:root {
  --paper: #f3f0e8;
  --ink: #171716;
  --muted: #737067;
  --line: rgba(23,23,22,.22);
  --exact: #ff2f91;
  --selected: #7452ff;
  --error: #e84a2d;
  --blur: 12px;
  --calendar-opacity: .28;
  --cell-scale: 1;
}

html, body {
  margin: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: #d8d4cb;
  color: var(--ink);
  font-family: "IBM Plex Mono", monospace;
}

button, textarea, select {
  font: inherit;
}

button {
  color: inherit;
}

.app {
  width: 100vw;
  height: 100vh;
  position: relative;
  overflow: hidden;
  background: var(--paper);
}

/* BACKGROUND CALENDAR */
.calendar-bg {
  position: absolute;
  inset: 0;
  padding: 82px 34px 28px;
  filter: blur(var(--blur));
  opacity: var(--calendar-opacity);
  transform: scale(1.02);
  transition: filter .7s ease, opacity .7s ease, transform .7s ease;
  pointer-events: none;
}

.calendar-chrome {
  height: 78px;
  display: flex;
  justify-content: space-between;
  align-items: end;
  border-bottom: 2px solid var(--ink);
  padding-bottom: 16px;
}

.calendar-kicker {
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--muted);
  margin-bottom: 8px;
}

.calendar-state {
  font-family: "Inter", sans-serif;
  font-size: 32px;
  font-weight: 700;
  letter-spacing: -.045em;
}

.calendar-month {
  font-family: "Inter", sans-serif;
  font-size: 28px;
  font-weight: 700;
  letter-spacing: -.04em;
}

.weekdays {
  height: 40px;
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  border-left: 1px solid var(--ink);
}

.weekdays span {
  display: grid;
  place-items: center;
  border-right: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--muted);
}

.calendar-grid {
  height: calc(100vh - 228px);
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  grid-template-rows: repeat(6, 1fr);
  border-left: 1px solid var(--ink);
}

.day-cell {
  position: relative;
  border-right: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
  background: transparent;
  overflow: hidden;
}

.day-cell.empty {
  background: rgba(23,23,22,.03);
}

.day-number {
  position: absolute;
  top: 12px;
  left: 14px;
  font-family: "Inter", sans-serif;
  font-size: clamp(24px, 2.1vw, 38px);
  font-weight: 700;
  letter-spacing: -.05em;
}

.day-cell.period {
  background:
    repeating-linear-gradient(
      135deg,
      rgba(116,82,255,.14) 0 10px,
      transparent 10px 20px
    );
}

.day-cell.candidate {
  outline: 3px solid rgba(116,82,255,.45);
  outline-offset: -5px;
}

.day-cell.exact {
  background: var(--exact);
  color: #fff;
  z-index: 2;
}

.day-cell.selected {
  background: var(--selected);
  color: #fff;
  z-index: 2;
}

.day-cell.dim {
  opacity: .18;
}

.day-cell.crossed::before,
.day-cell.crossed::after {
  content: "";
  position: absolute;
  left: 8%;
  top: 49%;
  width: 84%;
  height: 5px;
  background: var(--error);
  transform-origin: center;
  opacity: .88;
}

.day-cell.crossed::before {
  transform: rotate(32deg);
}

.day-cell.crossed::after {
  transform: rotate(-32deg);
}

.calendar-vignette {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at center, transparent 35%, rgba(243,240,232,.3) 75%, rgba(243,240,232,.65) 100%);
  pointer-events: none;
}

/* TOP */
.topbar {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 82px;
  padding: 0 34px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  z-index: 5;
  border-bottom: 1px solid rgba(23,23,22,.18);
  background: rgba(243,240,232,.72);
  backdrop-filter: blur(10px);
}

.brand {
  font-family: "Inter", sans-serif;
  font-size: clamp(34px, 3.8vw, 64px);
  font-weight: 700;
  letter-spacing: -.06em;
  line-height: 1;
}

.date-slot {
  text-align: right;
}

.date-slot span {
  display: block;
  font-size: 10px;
  letter-spacing: .12em;
  color: var(--muted);
  margin-bottom: 5px;
}

.date-slot strong {
  font-family: "Inter", sans-serif;
  font-size: clamp(19px, 1.8vw, 30px);
  letter-spacing: -.04em;
}

/* CENTER CARD */
.interaction-shell {
  position: absolute;
  inset: 82px 0 0;
  display: grid;
  place-items: center;
  z-index: 4;
  pointer-events: none;
}

.interaction-card {
  width: min(980px, 74vw);
  min-height: 360px;
  padding: 34px 42px 38px;
  background: rgba(246,243,235,.88);
  border: 2px solid var(--ink);
  box-shadow: 0 26px 80px rgba(23,23,22,.18);
  backdrop-filter: blur(18px);
  pointer-events: auto;
}

.step-row {
  display: flex;
  gap: 10px;
  align-items: baseline;
  margin-bottom: 18px;
}

.step-label {
  font-size: 10px;
  letter-spacing: .11em;
  color: var(--muted);
}

.step-number {
  font-family: "Inter", sans-serif;
  font-size: 22px;
  font-weight: 700;
}

.interaction-card h1 {
  margin: 0;
  font-family: "Inter", sans-serif;
  font-size: clamp(46px, 5vw, 84px);
  line-height: .94;
  letter-spacing: -.06em;
  font-weight: 700;
  min-height: 1.95em;
}

.control-area {
  margin-top: 30px;
}

.experience-input {
  display: grid;
  gap: 16px;
}

.experience-input textarea {
  width: 100%;
  min-height: 160px;
  resize: none;
  border: 2px solid var(--ink);
  background: rgba(255,255,255,.46);
  outline: none;
  padding: 18px;
  font-size: clamp(22px, 2vw, 32px);
  line-height: 1.35;
}

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

.choice, .submit, .restart {
  border: 2px solid var(--ink);
  background: rgba(243,240,232,.72);
  color: var(--ink);
  padding: 16px 24px;
  cursor: pointer;
  font-family: "Inter", sans-serif;
  font-size: clamp(20px, 1.7vw, 28px);
  font-weight: 700;
  letter-spacing: -.03em;
}

.choice:hover, .submit:hover, .restart:hover {
  background: var(--ink);
  color: var(--paper);
}

.submit {
  justify-self: start;
  background: var(--ink);
  color: var(--paper);
}

.date-selectors {
  display: grid;
  grid-template-columns: 1.2fr .8fr 1fr auto;
  gap: 12px;
  align-items: stretch;
}

.date-selectors select {
  min-height: 64px;
  border: 2px solid var(--ink);
  background: rgba(255,255,255,.65);
  padding: 0 14px;
  font-family: "Inter", sans-serif;
  font-size: 20px;
  font-weight: 700;
  outline: none;
}

.date-selectors .confirm-date {
  border: 2px solid var(--ink);
  background: var(--ink);
  color: var(--paper);
  padding: 0 22px;
  cursor: pointer;
  font-family: "Inter", sans-serif;
  font-size: 18px;
  font-weight: 700;
}

.output-kicker {
  font-size: 11px;
  color: var(--muted);
  letter-spacing: .1em;
  margin-bottom: 12px;
}

.output-title {
  margin: 0;
  font-family: "Inter", sans-serif;
  font-size: clamp(64px, 7vw, 118px);
  line-height: .86;
  letter-spacing: -.07em;
  font-weight: 700;
}

.output-title.exact { color: var(--exact); }
.output-title.selected { color: var(--selected); }
.output-title.cannot { color: var(--error); }

.output-date {
  margin-top: 22px;
  font-family: "Inter", sans-serif;
  font-size: clamp(30px, 3vw, 52px);
  font-weight: 700;
  letter-spacing: -.05em;
}

/* TRACE */
.trace-panel {
  position: absolute;
  left: 22px;
  bottom: 22px;
  width: min(350px, 26vw);
  max-height: 38vh;
  overflow: hidden;
  z-index: 6;
  background: rgba(243,240,232,.82);
  border: 1px solid rgba(23,23,22,.34);
  backdrop-filter: blur(14px);
  padding: 14px 14px 10px;
}

.trace-title {
  font-size: 10px;
  letter-spacing: .12em;
  margin-bottom: 10px;
  color: var(--muted);
}

.trace-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  max-height: 31vh;
  overflow-y: auto;
  padding-right: 4px;
}

.trace-item {
  border-top: 1px solid rgba(23,23,22,.14);
  padding-top: 8px;
}

.trace-question {
  font-size: 10px;
  color: var(--muted);
  line-height: 1.4;
  margin-bottom: 3px;
}

.trace-answer {
  font-family: "Inter", sans-serif;
  font-size: 13px;
  font-weight: 700;
  line-height: 1.35;
}

.restart {
  position: absolute;
  right: 22px;
  bottom: 22px;
  z-index: 7;
  font-size: 14px;
  padding: 11px 15px;
  background: rgba(243,240,232,.9);
}

.hidden {
  display: none !important;
}

/* Progressive visual states */
.app[data-progress="0"] {
  --blur: 14px;
  --calendar-opacity: .18;
}

.app[data-progress="1"] {
  --blur: 11px;
  --calendar-opacity: .24;
}

.app[data-progress="2"] {
  --blur: 8px;
  --calendar-opacity: .32;
}

.app[data-progress="3"] {
  --blur: 5px;
  --calendar-opacity: .42;
}

.app[data-progress="4"] {
  --blur: 2px;
  --calendar-opacity: .56;
}

.app[data-progress="5"] {
  --blur: 0px;
  --calendar-opacity: .82;
}

@media (max-width: 900px) {
  .interaction-card {
    width: 88vw;
  }

  .trace-panel {
    display: none;
  }

  .date-selectors {
    grid-template-columns: 1fr 1fr;
  }

  .date-selectors .confirm-date {
    min-height: 60px;
  }
}