:root {
  --paper: #edf2ec;
  --paper-strong: #fbfff8;
  --ink: #20242b;
  --muted: #687070;
  --line: #c7cabd;
  --blue: #243c98;
  --teal: #087b70;
  --coral: #d04b39;
  --gold: #d69b2d;
  --green: #2e6d3d;
  --shadow: 0 18px 45px rgba(32, 36, 43, 0.14);
  --font-display: "Avenir Next Condensed", "DIN Condensed", "Gill Sans", sans-serif;
  --font-body: "Iowan Old Style", Georgia, serif;
  --font-ui: "Avenir Next", "Gill Sans", sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background:
    linear-gradient(rgba(36, 60, 152, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(8, 123, 112, 0.06) 1px, transparent 1px),
    var(--paper);
  background-size: 34px 34px;
  font-family: var(--font-body);
}

button,
input {
  font: inherit;
}

.app-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(290px, 370px);
  height: 100vh;
  min-height: 100vh;
  overflow: hidden;
}

.workbench {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr) auto;
  height: 100vh;
  min-height: 100vh;
  border-right: 3px solid var(--ink);
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 24px clamp(24px, 4vw, 58px) 14px;
}

.eyebrow,
.result-kicker {
  margin: 0 0 4px;
  color: var(--teal);
  font-family: var(--font-ui);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 0;
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 7vw, 5.4rem);
  font-weight: 800;
  letter-spacing: 0;
  line-height: 0.9;
  text-transform: uppercase;
}

.desktop-note {
  display: none;
  margin: 12px 0 0;
  padding: 5px 9px;
  border: 2px solid rgba(32, 36, 43, 0.34);
  border-radius: 6px;
  color: var(--muted);
  background: rgba(251, 255, 248, 0.64);
  font-family: var(--font-ui);
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.02em;
}

h2 {
  margin-bottom: 0;
  font-family: var(--font-display);
  font-size: 3.25rem;
  font-weight: 800;
  letter-spacing: 0;
  line-height: 0.9;
  text-transform: uppercase;
}

h3 {
  margin: 0 0 12px;
  color: var(--muted);
  font-family: var(--font-ui);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.reset-button,
.prompt button {
  min-height: 42px;
  border: 2px solid var(--ink);
  border-radius: 6px;
  color: var(--ink);
  background: var(--paper-strong);
  box-shadow: 4px 4px 0 var(--ink);
  cursor: pointer;
  font-family: var(--font-ui);
  font-size: 0.88rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.reset-button {
  padding: 0 18px;
}

.reset-button:hover,
.prompt button:hover {
  transform: translate(1px, 1px);
  box-shadow: 3px 3px 0 var(--ink);
}

.fraction-stage {
  position: relative;
  display: grid;
  align-content: center;
  gap: 10px;
  min-height: 0;
  padding: 18px clamp(24px, 6vw, 86px) 24px;
}

.rail-label {
  width: min(100%, 820px);
  margin: 0 auto -4px;
  color: var(--muted);
  font-family: var(--font-ui);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.denominator-label {
  margin-top: -4px;
}

.dropzone {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 12px;
  width: min(100%, 820px);
  min-height: clamp(104px, 17vh, 142px);
  margin: 0 auto;
  padding: 18px;
  border: 2px dashed rgba(32, 36, 43, 0.28);
  border-radius: 8px;
  background: rgba(255, 253, 246, 0.58);
  transition: border-color 160ms ease, background 160ms ease, transform 160ms ease;
}

.dropzone:empty::before {
  content: "";
  width: 78px;
  height: 18px;
  border-top: 3px solid rgba(32, 36, 43, 0.14);
  border-bottom: 3px solid rgba(32, 36, 43, 0.14);
}

.dropzone.drag-over {
  border-color: var(--teal);
  background: rgba(8, 123, 112, 0.09);
  transform: scale(1.01);
}

.dropzone.active-zone {
  border-color: var(--gold);
  background:
    linear-gradient(135deg, rgba(214, 155, 45, 0.12), transparent 42%),
    rgba(255, 253, 246, 0.7);
}

.fraction-bar {
  width: min(100%, 840px);
  height: 5px;
  margin: 0 auto;
  border-radius: 999px;
  background: var(--ink);
  box-shadow: 0 8px 0 rgba(8, 123, 112, 0.15);
}

.prompt {
  position: absolute;
  right: clamp(18px, 3vw, 42px);
  bottom: 28px;
  width: min(360px, calc(100% - 36px));
  padding: 16px;
  border: 2px solid var(--ink);
  border-radius: 8px;
  background: var(--paper-strong);
  box-shadow: var(--shadow);
  font-family: var(--font-ui);
}

.prompt p {
  margin: 0 0 12px;
  color: var(--ink);
  font-size: 0.95rem;
  line-height: 1.35;
}

.prompt-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.prompt button {
  padding: 0 12px;
  font-size: 0.76rem;
}

.prompt .ghost-button {
  box-shadow: none;
}

.result-panel {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: center;
  gap: clamp(18px, 4vw, 38px);
  padding: 18px clamp(24px, 4vw, 58px) 20px;
  border-top: 3px solid var(--ink);
  background:
    linear-gradient(90deg, rgba(208, 75, 57, 0.12), transparent 42%),
    var(--paper-strong);
}

.equals-mark {
  color: var(--teal);
  font-family: var(--font-display);
  font-size: clamp(4.2rem, 12vw, 8.5rem);
  font-weight: 900;
  line-height: 0.75;
}

.result-name {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 7vw, 6.1rem);
  font-weight: 800;
  letter-spacing: 0;
  line-height: 0.82;
  text-transform: uppercase;
}

.result-formula {
  margin: 10px 0 0;
  color: var(--muted);
  font-family: var(--font-ui);
  font-size: clamp(1rem, 2vw, 1.35rem);
  font-weight: 800;
  letter-spacing: 0.02em;
}

.palette-panel {
  height: 100vh;
  min-height: 100vh;
  overflow-y: auto;
  padding: 30px 24px;
  background:
    linear-gradient(180deg, rgba(36, 60, 152, 0.12), transparent 260px),
    var(--paper-strong);
}

.palette-heading {
  margin-bottom: 26px;
}

.palette-group + .palette-group {
  margin-top: 28px;
}

.dimension-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.dimension-card {
  position: relative;
  display: grid;
  gap: 3px;
  min-height: 82px;
  padding: 12px 12px 42px;
  border-radius: 8px;
  color: var(--ink);
  background: var(--paper);
  box-shadow: 5px 5px 0 rgba(32, 36, 43, 0.1);
  cursor: pointer;
  touch-action: manipulation;
  user-select: none;
  transition: transform 150ms ease, box-shadow 150ms ease, background 150ms ease;
}

.dimension-card:active {
  cursor: grabbing;
}

.dimension-card.drag-source {
  opacity: 0.48;
}

.dimension-card:hover {
  transform: translateY(-2px);
  background: #ffffff;
  box-shadow: 5px 7px 0 rgba(32, 36, 43, 0.14);
}

.dimension-card.basic {
  border: 5px solid var(--blue);
}

.dimension-card.composite {
  border: 3px dashed rgba(32, 36, 43, 0.55);
}

.dimension-card.is-token {
  min-width: 136px;
  min-height: 76px;
  padding-bottom: 42px;
  box-shadow: 5px 5px 0 rgba(8, 123, 112, 0.18);
}

.dimension-name {
  padding-right: 16px;
  font-family: var(--font-display);
  font-size: clamp(1.03rem, 1.55vw, 1.45rem);
  font-weight: 900;
  letter-spacing: 0;
  line-height: 0.9;
  text-transform: uppercase;
  white-space: normal;
}

.dimension-card.is-token .dimension-name {
  font-size: 1.55rem;
}

.dimension-card.long-name .dimension-name {
  font-size: 0.98rem;
  line-height: 1;
}

.dimension-card.is-token.long-name {
  min-width: 176px;
}

.dimension-card.is-token.long-name .dimension-name {
  font-size: 1.15rem;
}

.dimension-unit,
.dimension-symbol {
  color: var(--muted);
  font-family: var(--font-ui);
  font-size: 0.83rem;
  font-weight: 800;
  line-height: 1.15;
}

.dimension-symbol {
  color: var(--green);
}

.place-controls {
  position: absolute;
  right: 8px;
  bottom: 8px;
  left: 8px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
}

.place-button {
  min-height: 26px;
  border: 2px solid rgba(32, 36, 43, 0.72);
  border-radius: 5px;
  color: var(--ink);
  background: var(--paper-strong);
  cursor: pointer;
  font-family: var(--font-ui);
  font-size: 0.74rem;
  font-weight: 900;
  letter-spacing: 0.02em;
}

.place-button:hover {
  border-color: var(--teal);
  color: var(--teal);
}

.token-controls {
  position: absolute;
  right: 8px;
  bottom: 8px;
  left: 8px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
}

.token-controls.has-fracture {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.token-button {
  min-height: 26px;
  border: 2px solid var(--ink);
  border-radius: 5px;
  color: var(--ink);
  background: var(--gold);
  cursor: pointer;
  font-family: var(--font-ui);
  font-size: 1rem;
  font-weight: 900;
  letter-spacing: 0.02em;
  line-height: 1;
}

.token-button:hover {
  background: var(--paper-strong);
  color: var(--teal);
}

.remove-token {
  position: absolute;
  right: -8px;
  top: -8px;
  display: grid;
  place-items: center;
  width: 24px;
  height: 24px;
  border: 2px solid var(--ink);
  border-radius: 50%;
  color: var(--ink);
  background: var(--gold);
  cursor: pointer;
  font-family: var(--font-ui);
  font-size: 0.85rem;
  font-weight: 900;
  line-height: 1;
}

.remove-token:hover {
  background: var(--coral);
  color: #ffffff;
}

.shake {
  animation: shake 260ms ease;
}

@keyframes shake {
  0%,
  100% {
    transform: translateX(0);
  }

  35% {
    transform: translateX(-6px);
  }

  70% {
    transform: translateX(5px);
  }
}

@media (max-width: 920px) {
  .app-shell {
    grid-template-columns: 1fr;
    height: auto;
    overflow: visible;
  }

  .workbench {
    height: auto;
    min-height: 76vh;
    border-right: 0;
    border-bottom: 3px solid var(--ink);
  }

  .palette-panel {
    height: auto;
    min-height: auto;
    overflow: visible;
  }

  .dimension-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  body {
    padding-bottom: 112px;
  }

  .topbar,
  .result-panel {
    padding-left: 18px;
    padding-right: 18px;
  }

  .topbar {
    align-items: flex-start;
    flex-direction: column;
    gap: 14px;
    padding-top: 18px;
  }

  .desktop-note {
    display: inline-block;
  }

  h1 {
    font-size: clamp(2.2rem, 12vw, 3.2rem);
  }

  .fraction-stage {
    min-height: 318px;
    padding-left: 16px;
    padding-right: 16px;
  }

  .dropzone {
    justify-content: flex-start;
    min-height: 104px;
    padding: 12px;
  }

  .dimension-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .result-panel {
    position: fixed;
    right: 0;
    bottom: 0;
    left: 0;
    z-index: 30;
    grid-template-columns: 1fr;
    gap: 8px;
    padding-top: 12px;
    padding-bottom: 14px;
    box-shadow: 0 -10px 24px rgba(32, 36, 43, 0.16);
  }

  .equals-mark {
    display: none;
  }

  .result-name {
    font-size: clamp(1.85rem, 11vw, 2.6rem);
    line-height: 0.9;
  }

  .result-formula {
    margin-top: 5px;
    font-size: 0.95rem;
  }

  .prompt:not([hidden]) {
    position: fixed;
    right: 12px;
    bottom: 100px;
    left: 12px;
    z-index: 40;
    width: auto;
    padding: 14px;
  }
}