:root {
  color-scheme: light;
  --bg: #eef1f0;
  --panel: #ffffff;
  --ink: #17211f;
  --muted: #64706d;
  --line: #d8dfdc;
  --accent: #087f8c;
  --accent-strong: #05606a;
  --coral: #c8553d;
  --amber: #d59a2f;
  --water: #55b7d6;
  --shadow: 0 18px 45px rgba(23, 33, 31, 0.12);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.72), rgba(255, 255, 255, 0) 28rem),
    var(--bg);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

button,
input,
select {
  font: inherit;
}

.app-shell {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
  padding: 32px 0;
}

.calculator {
  display: grid;
  grid-template-columns: minmax(0, 1.06fr) minmax(340px, 0.94fr);
  gap: 18px;
  align-items: stretch;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.input-panel {
  padding: 24px;
}

.heading,
.result-heading {
  margin-bottom: 20px;
}

.eyebrow {
  margin: 0 0 6px;
  color: var(--accent-strong);
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1,
h2 {
  margin: 0;
  letter-spacing: 0;
}

h1 {
  font-size: clamp(2rem, 3.8vw, 3.5rem);
  line-height: 1;
}

h2 {
  font-size: clamp(2.1rem, 4vw, 4.25rem);
  line-height: 0.95;
}

.field-grid,
.liquid-row,
.stone-row {
  display: grid;
  gap: 14px;
}

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

.liquid-row {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 16px;
}

.stone-row {
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr) auto;
  margin-top: 16px;
}

.stone-actions {
  display: grid;
  align-items: end;
}

.stone-actions .secondary-button {
  min-height: 48px;
  white-space: nowrap;
}

.stone-list {
  display: grid;
  gap: 8px;
  margin: 10px 0 0;
  padding: 0;
  list-style: none;
}

.stone-list.is-empty {
  display: none;
}

.stone-list-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 10px;
  align-items: center;
  min-height: 40px;
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #f8faf9;
  color: var(--ink);
  font-size: 0.84rem;
  font-weight: 800;
}

.stone-list-item span {
  min-width: 0;
  overflow-wrap: anywhere;
}

.stone-remove-button {
  min-height: 28px;
  padding: 0 9px;
  border: 1px solid rgba(200, 85, 61, 0.32);
  border-radius: 6px;
  background: #fff1ee;
  color: #7d2f20;
  font-size: 0.76rem;
  font-weight: 900;
  cursor: pointer;
}

.stone-remove-button:hover {
  border-color: var(--coral);
}

.field {
  display: grid;
  gap: 8px;
  color: var(--muted);
  font-size: 0.88rem;
  font-weight: 700;
}

.field.is-hidden {
  display: none;
}

.input-wrap {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 10px;
  min-height: 48px;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #f8faf9;
  color: var(--muted);
  font-weight: 800;
}

input,
select {
  width: 100%;
  min-width: 0;
  border: 0;
  outline: 0;
  background: transparent;
  color: var(--ink);
  font-weight: 800;
}

select {
  min-height: 48px;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #f8faf9;
}

input:disabled {
  color: #88928f;
}

.input-wrap:focus-within,
select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(8, 127, 140, 0.14);
}

.form-actions {
  display: flex;
  justify-content: flex-end;
  margin-top: 18px;
}

.secondary-button {
  min-height: 40px;
  padding: 0 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #f8faf9;
  color: var(--ink);
  font-weight: 800;
  cursor: pointer;
}

.secondary-button:hover {
  border-color: var(--accent);
}

.result-panel {
  display: grid;
  grid-template-rows: auto auto 1fr auto;
  gap: 18px;
  padding: 22px;
}

.visual {
  min-height: 224px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  align-items: stretch;
  padding: 14px 12px 10px;
  border-radius: 8px;
  background:
    linear-gradient(90deg, rgba(8, 127, 140, 0.12) 1px, transparent 1px),
    linear-gradient(0deg, rgba(8, 127, 140, 0.10) 1px, transparent 1px),
    #f8faf9;
  background-size: 24px 24px;
  overflow: hidden;
}

.stage {
  display: grid;
  grid-template-rows: minmax(158px, 1fr) auto;
  justify-items: center;
  min-width: 0;
  position: relative;
}

.stage > span {
  position: absolute;
  left: 6px;
  top: 6px;
  z-index: 3;
  display: grid;
  place-items: center;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--ink);
  color: #ffffff;
  font-size: 0.78rem;
  font-weight: 900;
}

.stage-scene {
  display: grid;
  place-items: center;
  width: 100%;
  min-height: 158px;
}

.stage-caption {
  position: static;
  display: block;
  width: 100%;
  margin: 8px 0 0;
  overflow-wrap: normal;
  word-break: keep-all;
  color: var(--muted);
  font-size: 0.68rem;
  font-weight: 800;
  line-height: 1.15;
  text-align: center;
}

.caption-action {
  display: inline-block;
  color: var(--ink);
  text-align: center;
  white-space: nowrap;
}

.caption-line {
  display: inline-block;
  text-align: center;
  white-space: nowrap;
}

.mini-scale {
  width: 128px;
  max-width: 100%;
  height: 122px;
  position: relative;
}

.mini-scale::before {
  content: "";
  position: absolute;
  left: 50%;
  bottom: -23px;
  z-index: 0;
  width: 58px;
  height: 23px;
  transform: translateX(-50%);
  border-radius: 8px 8px 0 0;
  background: #52605c;
}

.mini-scale::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 1;
  height: 7px;
  border-radius: 999px;
  background: #52605c;
}

.stage-flask {
  position: absolute;
  left: 50%;
  bottom: 7px;
  z-index: 2;
  width: 62px;
  height: 104px;
  transform: translateX(-50%);
  border: 3px solid #7d8b87;
  border-top: 0;
  border-radius: 4px 4px 11px 11px;
  background:
    linear-gradient(90deg, rgba(255, 255, 255, 0.72) 0 20%, rgba(255, 255, 255, 0.28) 20% 32%, transparent 32%),
    rgba(255, 255, 255, 0.54);
  overflow: visible;
}

.stage-flask::after {
  content: "";
  position: absolute;
  right: 8px;
  top: 18px;
  width: 15px;
  height: 58px;
  background:
    linear-gradient(90deg, rgba(61, 73, 70, 0.38) 0 12px, transparent 12px),
    repeating-linear-gradient(180deg, transparent 0 8px, rgba(61, 73, 70, 0.34) 8px 9px, transparent 9px 13px);
  opacity: 0.78;
}

.flask-rim {
  position: absolute;
  left: -4px;
  right: -4px;
  top: -9px;
  z-index: 3;
  border: 3px solid #7d8b87;
  height: 16px;
  border-radius: 999px;
  background:
    radial-gradient(ellipse at center, rgba(23, 33, 31, 0.12) 0 43%, rgba(255, 255, 255, 0.82) 46% 100%);
  box-shadow: 0 2px 0 rgba(255, 255, 255, 0.38);
}

.water {
  position: absolute;
  inset: auto 0 0;
  height: 68%;
  overflow: hidden;
  border-radius: 0 0 7px 7px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.32), rgba(255, 255, 255, 0) 32%),
    var(--water);
}

.water::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: -8px;
  height: 16px;
  border-radius: 50%;
  background: rgba(85, 183, 214, 0.78);
}

.stage-sample {
  position: absolute;
  z-index: 4;
  width: 24px;
  height: 24px;
  border-radius: 6px;
  background: linear-gradient(135deg, var(--coral), #8f3528);
  box-shadow: 0 9px 16px rgba(143, 53, 40, 0.22);
}

.stage-sample.is-beside {
  right: 4px;
  bottom: 7px;
  transform: rotate(10deg);
  transform-origin: 50% 100%;
}

.stage-sample.is-inside {
  left: 50%;
  bottom: 20px;
  transform: translateX(-50%) rotate(10deg);
}

.stage-string {
  position: absolute;
  left: 50%;
  top: -32px;
  z-index: 5;
  width: 2px;
  height: 106px;
  transform: translateX(-50%);
  background: #3d4946;
}

.metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin: 0;
}

.metrics div {
  min-height: 70px;
  padding: 13px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #f8faf9;
}

.metrics dt {
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 800;
}

.metrics dd {
  margin: 6px 0 0;
  color: var(--ink);
  font-size: 1.05rem;
  font-weight: 900;
  overflow-wrap: anywhere;
}

.material-reference {
  display: grid;
  grid-column: 1 / -1;
  gap: 12px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #f8faf9;
}

.material-summary {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  align-items: end;
}

.material-filter {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 6px;
  min-width: min(100%, 360px);
  margin: 0;
  padding: 0;
  border: 0;
}

.material-filter label {
  position: relative;
}

.material-filter input {
  position: absolute;
  inset: 0;
  opacity: 0;
}

.material-filter span {
  display: grid;
  place-items: center;
  min-height: 34px;
  padding: 0 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 900;
  text-align: center;
  white-space: nowrap;
}

.material-filter input:checked + span {
  border-color: var(--accent);
  background: #e8f6f7;
  color: var(--accent-strong);
}

.material-filter input:focus-visible + span {
  box-shadow: 0 0 0 3px rgba(8, 127, 140, 0.14);
}

.material-summary h3 {
  margin: 0;
  font-size: 1.18rem;
  line-height: 1.1;
  letter-spacing: 0;
}

.material-delta {
  margin: 0;
  color: var(--muted);
  font-size: 0.86rem;
  font-weight: 800;
  text-align: right;
}

.material-track {
  position: relative;
  min-height: 162px;
  margin-top: 64px;
}

.material-axis {
  position: absolute;
  left: 0;
  right: 0;
  top: 45px;
  height: 8px;
  border-radius: 999px;
  background: linear-gradient(90deg, #879096 0%, #7d878c 10%, #8d969a 27%, #a88925 32%, #b46a32 36%, #d8dee0 45%, #c9a03a 53%, #d6a11d 66%, #e0ad1e 77%, #777f84 81%, #b8bec4 88%, #d7dde1 94%, #eef1f4 100%);
  box-shadow: inset 0 0 0 1px rgba(23, 33, 31, 0.14);
}

.material-track.is-hovering {
  cursor: crosshair;
}

.material-marker {
  position: absolute;
  top: 18px;
  left: 0;
  display: grid;
  justify-items: center;
  transform: translateX(-50%);
  transition: left 140ms ease;
  z-index: 2;
}

.material-marker span {
  min-width: 46px;
  padding: 4px 7px;
  border-radius: 6px;
  background: var(--ink);
  color: #ffffff;
  font-size: 0.78rem;
  font-weight: 900;
  line-height: 1;
  text-align: center;
}

.material-marker::after {
  content: "";
  width: 0;
  height: 0;
  border-left: 7px solid transparent;
  border-right: 7px solid transparent;
  border-top: 10px solid var(--ink);
}

.material-hover-marker {
  position: absolute;
  top: 4px;
  left: 0;
  z-index: 5;
  display: grid;
  justify-items: center;
  opacity: 0;
  pointer-events: none;
  transform: translateX(-50%);
  transition: opacity 100ms ease;
}

.material-hover-marker.is-visible {
  opacity: 1;
}

.material-hover-marker span {
  min-width: 62px;
  padding: 4px 7px;
  border-radius: 6px;
  background: #ffffff;
  color: var(--ink);
  border: 1px solid rgba(23, 33, 31, 0.18);
  box-shadow: 0 8px 18px rgba(23, 33, 31, 0.12);
  font-size: 0.72rem;
  font-weight: 900;
  line-height: 1;
  text-align: center;
  white-space: nowrap;
}

.material-hover-marker::after {
  content: "";
  width: 2px;
  height: 37px;
  background: rgba(23, 33, 31, 0.72);
}

.material-ticks {
  position: absolute;
  inset: 0;
}

.material-tick {
  position: absolute;
  top: 39px;
  width: 2px;
  height: 22px;
  transform: translateX(-50%);
  border-radius: 999px;
  background: var(--ink);
}

.material-range-band {
  position: absolute;
  top: 45px;
  height: 8px;
  border-radius: 999px;
  background: rgba(190, 201, 204, 0.92);
  box-shadow: inset 0 0 0 1px rgba(52, 64, 68, 0.22);
  pointer-events: none;
  z-index: 1;
}

.material-tick span {
  position: absolute;
  top: 34px;
  left: 50%;
  display: block;
  max-width: none;
  padding: 3px 6px;
  border: 1px solid rgba(23, 33, 31, 0.14);
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.86);
  color: #3b4643;
  font-size: 0.62rem;
  font-weight: 900;
  line-height: 1.1;
  text-align: center;
  transform: translateX(-10px) rotate(34deg);
  transform-origin: left center;
  white-space: nowrap;
}

.material-tick[data-side="above"] span {
  top: -38px;
  transform: translateX(-10px) rotate(-34deg);
}

.material-tick[data-side="below"][data-level="1"] span {
  top: 22px;
}

.material-tick[data-side="below"][data-level="2"] span {
  top: 46px;
}

.material-tick[data-side="below"][data-level="3"] span {
  top: 58px;
}

.material-tick[data-side="above"][data-level="1"] span {
  top: -26px;
}

.material-tick[data-side="above"][data-level="2"] span {
  top: -50px;
}

.material-tick[data-side="above"][data-level="3"] span {
  top: -62px;
}

.material-tick.is-left-edge span {
  left: 0;
  transform: translateX(0) rotate(34deg);
}

.material-tick.is-left-edge[data-side="above"] span {
  transform: translateX(0) rotate(-34deg);
}

.material-tick.is-right-edge span {
  left: auto;
  right: 0;
  transform: translateX(8px) rotate(34deg);
  transform-origin: right center;
}

.material-tick.is-right-edge[data-side="above"] span {
  transform: translateX(8px) rotate(-34deg);
}

.material-tick[data-material="titanium"] {
  background: #7d878c;
}

.material-tick[data-material="titanium"] span {
  border-color: #7d878c;
  background: #e4e8ea;
  color: #2f3b40;
}

.material-tick[data-material="stainless-steel"],
.material-tick[data-material="cobalt-chrome"] {
  background: #858f94;
}

.material-tick[data-material="stainless-steel"] span,
.material-tick[data-material="cobalt-chrome"] span {
  border-color: #858f94;
  background: #e7ecef;
  color: #303c42;
}

.material-tick[data-material="silver"] {
  background: #b8c1c4;
}

.material-tick[data-material="silver"] span {
  border-color: #b8c1c4;
  background: #f0f4f5;
  color: #344044;
}

.material-tick[data-material="8k-gold"] {
  background: #c39a2f;
}

.material-tick[data-material="8k-gold"] span {
  border-color: #c39a2f;
  background: #f7e3a8;
  color: #4c3606;
}

.material-tick[data-material="9k-gold"],
.material-tick[data-material="10k-gold"],
.material-tick[data-material="22k-gold"] {
  background: #cda22d;
}

.material-tick[data-material="9k-gold"] span,
.material-tick[data-material="10k-gold"] span,
.material-tick[data-material="22k-gold"] span {
  border-color: #cda22d;
  background: #f8dc83;
  color: #513805;
}

.material-tick[data-material="14k-gold"] {
  background: #d2a32e;
}

.material-tick[data-material="14k-gold"] span {
  border-color: #d2a32e;
  background: #ffe08a;
  color: #513805;
}

.material-tick[data-material="14k-white-gold"],
.material-tick[data-material="18k-white-gold"] {
  background: #c8c8bd;
}

.material-tick[data-material="14k-white-gold"] span,
.material-tick[data-material="18k-white-gold"] span {
  border-color: #c8c8bd;
  background: #f2f0df;
  color: #464536;
}

.material-tick[data-material="14k-rose-gold"],
.material-tick[data-material="18k-rose-gold"] {
  background: #c98566;
}

.material-tick[data-material="14k-rose-gold"] span,
.material-tick[data-material="18k-rose-gold"] span {
  border-color: #c98566;
  background: #f7d7c8;
  color: #5b2e1c;
}

.material-tick[data-material="18k-gold"] {
  background: #d6a11d;
}

.material-tick[data-material="18k-gold"] span {
  border-color: #d6a11d;
  background: #ffd568;
  color: #573800;
}

.material-tick[data-material="24k-gold"] {
  background: #e0ad1e;
}

.material-tick[data-material="24k-gold"] span {
  border-color: #e0ad1e;
  background: #ffc93d;
  color: #563600;
}

.material-tick[data-material="tungsten-carbide"],
.material-tick[data-material="tantalum"] {
  background: #687177;
}

.material-tick[data-material="tungsten-carbide"] span,
.material-tick[data-material="tantalum"] span {
  border-color: #687177;
  background: #dfe4e7;
  color: #263238;
}

.material-tick[data-material="palladium"] {
  background: #9fa8ad;
}

.material-tick[data-material="palladium"] span {
  border-color: #9fa8ad;
  background: #e7ecef;
  color: #303c42;
}

.material-tick[data-material="pt950"] {
  background: #b8bec4;
}

.material-tick[data-material="pt850"],
.material-tick[data-material="pt900"] {
  background: #acb3ba;
}

.material-tick[data-material="pt850"] span,
.material-tick[data-material="pt900"] span {
  border-color: #acb3ba;
  background: #eceff2;
  color: #343d45;
}

.material-tick[data-material="pt950"] span {
  border-color: #b8bec4;
  background: #eef1f4;
  color: #343d45;
}

.material-tick[data-material="platinum"] {
  background: #cfd5d9;
}

.material-tick[data-material="platinum"] span {
  border-color: #c0c8ce;
  background: #f5f7f9;
  color: #35404a;
}

.material-tick[data-material="brass"] {
  background: #a88925;
}

.material-tick[data-material="brass"] span {
  border-color: #b9972b;
  background: #fff4b8;
  color: #4b3a04;
}

.material-tick[data-material="tombak"] {
  background: #b77b34;
}

.material-tick[data-material="tombak"] span {
  border-color: #b77b34;
  background: #f4d1a2;
  color: #542f0c;
}

.material-tick[data-material="bronze"] {
  background: #8f6032;
}

.material-tick[data-material="bronze"] span {
  border-color: #9b6a3b;
  background: #f1d4b4;
  color: #4b2d13;
}

.material-tick[data-material="bronze"][data-side="above"] span {
  top: -49px;
}

.material-ticks[data-filter="non-precious"] .material-tick[data-material="bronze"][data-side="above"] span {
  top: -28px;
}

.material-tick[data-material="copper"] {
  background: #b46a32;
}

.material-tick[data-material="copper"] span {
  border-color: #bd7440;
  background: #f3c2a2;
  color: #542711;
}

.material-tick[data-material="copper"][data-side="above"] span {
  top: -18px;
}

.material-ticks[data-filter="non-precious"] .material-tick[data-material="copper"][data-side="above"] span {
  top: -13px;
}

.material-range {
  display: flex;
  justify-content: space-between;
  color: var(--muted);
  font-size: 0.76rem;
  font-weight: 800;
}

.status {
  min-height: 42px;
  margin: 0;
  padding: 12px 14px;
  border-left: 4px solid var(--accent);
  border-radius: 6px;
  background: #edf7f6;
  color: #28504f;
  font-weight: 700;
}

.status.is-error {
  border-left-color: var(--coral);
  background: #fff1ee;
  color: #7d2f20;
}

.status.is-warning {
  border-left-color: var(--amber);
  background: #fff8e8;
  color: #6d4a10;
}

@media (max-width: 840px) {
  .app-shell {
    width: min(100% - 24px, 640px);
    padding: 18px 0;
  }

  .calculator {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 560px) {
  .input-panel,
  .result-panel {
    padding: 16px;
  }

  .field-grid,
  .liquid-row,
  .stone-row,
  .metrics {
    grid-template-columns: 1fr;
  }

  .material-summary {
    display: grid;
    gap: 8px;
  }

  .material-filter {
    min-width: 0;
  }

  .material-delta {
    text-align: left;
  }

  h1 {
    font-size: 2.35rem;
  }

  h2 {
    font-size: 2.55rem;
  }
}