:root {
  color-scheme: dark;
  --page: #17131d;
  --page-soft: #211a27;
  --surface: #251d2a;
  --surface-strong: #2d2432;
  --surface-alt: #1c1721;
  --text: #f2eadf;
  --muted: #b8acba;
  --faint: #887d8d;
  --accent: #a77bc0;
  --accent-strong: #c39bda;
  --accent-ink: #201627;
  --line: rgba(221, 202, 229, 0.18);
  --line-strong: rgba(221, 202, 229, 0.34);
  --paper: #d9c69f;
  --paper-deep: #bca579;
  --paper-ink: #342533;
  --metal: #b88955;
  --success: #91b093;
  --warning: #d5ad68;
  --shadow: 0 24px 70px rgba(7, 4, 10, 0.42);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 24px;
  --display: Georgia, "Times New Roman", serif;
  --body: "Segoe UI", Arial, sans-serif;
}

html[data-theme="business"] {
  color-scheme: dark;
  --page: #17191c;
  --page-soft: #202329;
  --surface: #24282e;
  --surface-strong: #2b3037;
  --surface-alt: #1c1f23;
  --text: #eee9df;
  --muted: #b7b1a7;
  --faint: #807b74;
  --accent: #a98574;
  --accent-strong: #c2a48f;
  --accent-ink: #211b18;
  --line: rgba(226, 218, 203, 0.16);
  --line-strong: rgba(226, 218, 203, 0.3);
  --paper: #d8d1c3;
  --paper-deep: #bdb4a4;
  --paper-ink: #2a3035;
  --metal: #a99068;
  --success: #8eaa99;
  --warning: #c6a36d;
  --display: Georgia, "Times New Roman", serif;
}

html[data-theme="bright"] {
  color-scheme: light;
  --page: #f3efe6;
  --page-soft: #e9e4d9;
  --surface: #fffdf8;
  --surface-strong: #f7f1e6;
  --surface-alt: #ebe4d8;
  --text: #28353c;
  --muted: #66767c;
  --faint: #8b989b;
  --accent: #d57466;
  --accent-strong: #b85449;
  --accent-ink: #fffaf3;
  --line: rgba(38, 55, 62, 0.14);
  --line-strong: rgba(38, 55, 62, 0.28);
  --paper: #fffdf8;
  --paper-deep: #e8dfd0;
  --paper-ink: #27373e;
  --metal: #c99e4c;
  --success: #6f9f85;
  --warning: #bd8a3c;
  --shadow: 0 24px 60px rgba(62, 68, 62, 0.16);
  --display: "Segoe UI", Arial, sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  min-width: 320px;
  min-height: 100%;
  background: var(--page);
  scroll-behavior: smooth;
}

body {
  min-width: 320px;
  min-height: 100vh;
  margin: 0;
  color: var(--text);
  background:
    linear-gradient(115deg, transparent 0 68%, color-mix(in srgb, var(--accent) 6%, transparent) 68% 69%, transparent 69%),
    linear-gradient(25deg, transparent 0 24%, color-mix(in srgb, var(--metal) 5%, transparent) 24% 24.5%, transparent 24.5%),
    var(--page);
  font-family: var(--body);
  font-size: 16px;
  line-height: 1.5;
  transition: color 240ms ease, background-color 240ms ease;
}

button,
input,
select,
textarea {
  font: inherit;
}

button {
  color: inherit;
}

button:focus-visible,
a:focus-visible {
  outline: 3px solid var(--accent-strong);
  outline-offset: 3px;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 12px;
  left: 12px;
  padding: 10px 14px;
  color: var(--accent-ink);
  background: var(--accent-strong);
  border-radius: var(--radius-sm);
  transform: translateY(-180%);
}

.skip-link:focus {
  transform: translateY(0);
}

.app-shell {
  width: min(100%, 1440px);
  min-height: 100vh;
  margin: 0 auto;
  padding: 0 clamp(16px, 3vw, 44px);
  display: flex;
  flex-direction: column;
}

.site-header {
  min-height: 88px;
  padding: 18px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  border-bottom: 1px solid var(--line);
}

.brand {
  min-height: 48px;
  padding: 0;
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--text);
  background: none;
  border: 0;
  cursor: pointer;
  text-align: left;
}

.brand-mark {
  position: relative;
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  border: 1px solid var(--line-strong);
  border-radius: 50% 50% 46% 54%;
  background: var(--surface);
  transform: rotate(-4deg);
}

.brand-mark::before,
.brand-mark::after {
  content: "";
  position: absolute;
  width: 7px;
  height: 7px;
  border: 1px solid var(--metal);
  transform: rotate(45deg);
}

.brand-mark::before {
  top: -2px;
  right: 2px;
}

.brand-mark::after {
  bottom: 0;
  left: -2px;
  width: 4px;
  height: 4px;
}

.brand-mark__d {
  color: var(--accent-strong);
  font-family: var(--display);
  font-size: 23px;
  font-weight: 700;
  transform: rotate(4deg);
}

.brand-mark__spark {
  position: absolute;
  right: 8px;
  bottom: 8px;
  width: 2px;
  height: 9px;
  background: var(--metal);
  transform: rotate(38deg);
}

.brand-copy {
  display: grid;
  gap: 1px;
}

.brand-copy strong {
  font-family: var(--display);
  font-size: 18px;
  letter-spacing: 0.03em;
}

.brand-copy small {
  color: var(--muted);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.header-controls {
  display: flex;
  align-items: flex-end;
  gap: 12px;
}

.theme-picker {
  min-width: 0;
  margin: 0;
  padding: 0;
  display: flex;
  align-items: center;
  border: 0;
}

.theme-picker legend {
  margin: 0 10px 0 0;
  padding: 0;
  float: left;
  color: var(--muted);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.theme-picker button,
.language-picker button {
  min-height: 44px;
  padding: 9px 11px;
  color: var(--muted);
  background: var(--surface-alt);
  border: 1px solid var(--line);
  cursor: pointer;
}

.theme-picker button:first-of-type,
.language-picker button:first-child {
  border-radius: var(--radius-sm) 0 0 var(--radius-sm);
}

.theme-picker button:last-of-type,
.language-picker button:last-child {
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.theme-picker button + button,
.language-picker button + button {
  margin-left: -1px;
}

.theme-picker button[aria-pressed="true"],
.language-picker button[aria-pressed="true"] {
  position: relative;
  z-index: 1;
  color: var(--accent-ink);
  background: var(--accent-strong);
  border-color: var(--accent-strong);
}

.language-picker {
  display: flex;
}

.language-picker button {
  min-width: 44px;
  font-weight: 700;
}

#app {
  flex: 1;
  width: 100%;
  outline: none;
}

.site-footer {
  min-height: 60px;
  padding: 18px 0;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  color: var(--faint);
  border-top: 1px solid var(--line);
  font-size: 12px;
  letter-spacing: 0.04em;
}

.screen {
  animation: screen-in 400ms cubic-bezier(0.2, 0.75, 0.2, 1) both;
}

.screen-grid {
  width: min(1180px, 100%);
  min-height: calc(100vh - 150px);
  margin: 0 auto;
  padding: clamp(30px, 6vh, 76px) 0;
  display: grid;
  grid-template-columns: minmax(330px, 0.9fr) minmax(420px, 1.1fr);
  align-items: center;
  gap: clamp(36px, 6vw, 84px);
}

.screen-copy {
  max-width: 620px;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--accent-strong);
  font-size: 12px;
  font-weight: 750;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  overflow-wrap: anywhere;
}

h1,
h2,
h3 {
  margin-top: 0;
  color: var(--text);
  font-family: var(--display);
  font-weight: 600;
  line-height: 1.08;
}

h1 {
  max-width: 680px;
  margin-bottom: 22px;
  font-size: clamp(38px, 5vw, 72px);
  letter-spacing: -0.035em;
}

h2 {
  font-size: clamp(30px, 4vw, 48px);
  letter-spacing: -0.025em;
}

.lead {
  max-width: 570px;
  margin: 0 0 28px;
  color: var(--muted);
  font-size: clamp(17px, 2vw, 21px);
  line-height: 1.55;
}

.start-actions,
.result-actions,
.question-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
}

.primary-button,
.secondary-button,
.text-button {
  min-height: 48px;
  padding: 12px 18px;
  border-radius: var(--radius-sm);
  cursor: pointer;
}

.primary-button {
  color: var(--accent-ink);
  background: var(--accent-strong);
  border: 1px solid var(--accent-strong);
  font-weight: 750;
  box-shadow: 5px 5px 0 color-mix(in srgb, var(--metal) 40%, transparent);
}

.primary-button:hover {
  transform: translate(-1px, -1px);
  box-shadow: 7px 7px 0 color-mix(in srgb, var(--metal) 45%, transparent);
}

.secondary-button {
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--line-strong);
}

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

.text-button {
  min-height: 44px;
  padding-inline: 6px;
  color: var(--accent-strong);
  background: none;
  border: 0;
  text-decoration: underline;
  text-underline-offset: 5px;
}

.micro-notes {
  margin-top: 28px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px 24px;
  color: var(--muted);
  font-size: 13px;
}

.micro-notes span {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.micro-notes span::before {
  content: "";
  width: 6px;
  height: 6px;
  border: 1px solid var(--metal);
  transform: rotate(45deg);
}

.style-note {
  max-width: 520px;
  margin: 24px 0 0;
  padding-left: 16px;
  color: var(--muted);
  border-left: 2px solid var(--metal);
  font-size: 14px;
}

/* Central artifact */
.artifact-panel {
  position: relative;
  min-width: 0;
}

.artifact-stage {
  position: relative;
  width: min(100%, 470px);
  aspect-ratio: 0.88;
  margin: 0 auto;
  display: grid;
  place-items: center;
  isolation: isolate;
}

.artifact-stage::before {
  content: "";
  position: absolute;
  inset: 4% 1% 2% 5%;
  z-index: -3;
  border: 1px solid var(--line);
  border-radius: 46% 54% 48% 52%;
  transform: rotate(-3deg);
}

.artifact-stage::after {
  content: "";
  position: absolute;
  inset: 12% 9% 8% 0;
  z-index: -2;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  transform: rotate(7deg);
}

.artifact-object {
  position: relative;
  width: 76%;
  height: 78%;
  transform: rotate(-1.5deg);
  filter: drop-shadow(0 22px 20px rgba(5, 3, 8, 0.3));
}

.artifact-paper {
  position: absolute;
  inset: 5% 2%;
  z-index: 2;
  padding: 12% 10% 10%;
  overflow: hidden;
  color: var(--paper-ink);
  background:
    repeating-linear-gradient(7deg, transparent 0 15px, rgba(73, 51, 36, 0.025) 15px 16px),
    radial-gradient(circle at 16% 10%, rgba(255, 255, 255, 0.28), transparent 35%),
    linear-gradient(95deg, var(--paper-deep), var(--paper) 9% 88%, var(--paper-deep));
  border: 1px solid color-mix(in srgb, var(--paper-ink) 20%, transparent);
}

.artifact-paper::before {
  content: "";
  position: absolute;
  inset: 14px;
  z-index: -1;
  border: 1px solid color-mix(in srgb, var(--paper-ink) 14%, transparent);
  pointer-events: none;
}

.artifact-roll {
  position: absolute;
  left: -4%;
  z-index: 4;
  width: 108%;
  height: 8%;
  border: 1px solid color-mix(in srgb, var(--paper-ink) 20%, transparent);
  border-radius: 50%;
  background: linear-gradient(90deg, var(--paper-deep), var(--paper) 12% 88%, var(--paper-deep));
  box-shadow: 0 7px 12px rgba(49, 32, 25, 0.18);
}

.artifact-roll::after {
  content: "";
  position: absolute;
  inset: 36% 5%;
  border-top: 1px solid color-mix(in srgb, var(--paper-ink) 22%, transparent);
}

.artifact-roll--top {
  top: 1%;
}

.artifact-roll--bottom {
  bottom: 1%;
}

.artifact-content {
  position: relative;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.artifact-content.is-complete {
  justify-content: flex-start;
}

.artifact-complete-title {
  margin: 0 0 10px;
  padding-bottom: 9px;
  color: var(--paper-ink);
  border-bottom: 1px solid color-mix(in srgb, var(--paper-ink) 24%, transparent);
  font-family: var(--display);
  font-size: clamp(17px, 2.4vw, 24px);
  line-height: 1.05;
}

.artifact-entries {
  display: grid;
  gap: clamp(5px, 0.7vh, 9px);
}

.artifact-entry {
  position: relative;
  min-height: 29px;
  padding: 3px 0 5px 12px;
  border-bottom: 1px solid color-mix(in srgb, var(--paper-ink) 16%, transparent);
}

.artifact-entry::before {
  content: "";
  position: absolute;
  top: 8px;
  left: 0;
  width: 5px;
  height: 5px;
  border: 1px solid var(--paper-ink);
  transform: rotate(45deg);
  opacity: 0.62;
}

.artifact-entry.is-new {
  animation: ink-reveal 520ms ease both;
}

.artifact-entry__label {
  display: block;
  color: color-mix(in srgb, var(--paper-ink) 60%, transparent);
  font-size: 8px;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.artifact-entry__value {
  display: block;
  font-family: var(--display);
  font-size: clamp(11px, 1.5vw, 14px);
  line-height: 1.15;
}

.artifact-empty-lines {
  height: 100%;
  display: grid;
  align-content: center;
  gap: 22px;
}

.artifact-empty-lines span {
  height: 1px;
  display: block;
  background: color-mix(in srgb, var(--paper-ink) 13%, transparent);
}

.artifact-empty-lines span:nth-child(2) {
  width: 76%;
}

.artifact-empty-lines span:nth-child(3) {
  width: 88%;
}

.artifact-tool {
  position: absolute;
  right: 1%;
  bottom: 4%;
  z-index: 8;
  width: 11%;
  height: 62%;
  transform: rotate(34deg);
  transform-origin: bottom center;
  pointer-events: none;
}

.artifact-tool::before {
  content: "";
  position: absolute;
  top: 0;
  left: 11%;
  width: 76%;
  height: 58%;
  background:
    repeating-linear-gradient(155deg, transparent 0 7px, rgba(33, 22, 37, 0.28) 7px 8px),
    linear-gradient(90deg, #62506a, #ad91b9 44%, #56435e);
  border-radius: 84% 12% 76% 16%;
  clip-path: polygon(48% 0, 100% 18%, 70% 84%, 51% 100%, 33% 82%, 0 35%);
}

.artifact-tool::after {
  content: "";
  position: absolute;
  top: 52%;
  left: 45%;
  width: 12%;
  height: 48%;
  background: linear-gradient(var(--metal), #5c4533);
  border-radius: 4px 4px 60% 60%;
}

.artifact-caption {
  width: min(92%, 430px);
  margin: -2px auto 0;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  color: var(--muted);
  font-size: 12px;
  text-align: center;
}

.artifact-caption::before,
.artifact-caption::after {
  content: "";
  width: 20px;
  height: 1px;
  background: var(--line-strong);
}

.artifact-swatches {
  display: none;
}

/* Business notebook */
html[data-theme="business"] .artifact-object {
  width: 78%;
  height: 82%;
  transform: rotate(-1deg);
}

html[data-theme="business"] .artifact-roll {
  display: none;
}

html[data-theme="business"] .artifact-paper {
  inset: 0;
  padding: 10% 10% 9% 16%;
  background:
    linear-gradient(90deg, rgba(38, 42, 47, 0.16) 0 7%, transparent 7%),
    repeating-linear-gradient(0deg, transparent 0 27px, rgba(55, 71, 80, 0.13) 27px 28px),
    linear-gradient(95deg, #c5bcae, var(--paper) 8% 94%, #c6bdaf);
  border: 9px solid #343136;
  border-left-width: 18px;
  border-radius: 6px 13px 13px 6px;
  box-shadow: inset 2px 0 0 #8d745d, inset 7px 0 0 #242227;
}

html[data-theme="business"] .artifact-paper::before {
  inset: 13px 12px 13px 30px;
  border-color: rgba(74, 62, 56, 0.16);
  border-radius: 3px;
}

html[data-theme="business"] .artifact-tool {
  right: -1%;
  bottom: 0;
  width: 8%;
  height: 66%;
  transform: rotate(39deg);
}

html[data-theme="business"] .artifact-tool::before {
  top: 0;
  left: 27%;
  width: 46%;
  height: 76%;
  background: linear-gradient(90deg, #121417, #51565b 48%, #121417);
  border-radius: 5px;
  clip-path: none;
}

html[data-theme="business"] .artifact-tool::after {
  top: 74%;
  left: 20%;
  width: 60%;
  height: 24%;
  background: linear-gradient(90deg, #6f624d, #d1b886 48%, #6f624d);
  clip-path: polygon(50% 100%, 0 26%, 18% 0, 82% 0, 100% 26%);
  border-radius: 0;
}

html[data-theme="business"] .artifact-entry::before {
  width: 8px;
  height: 2px;
  border: 0;
  background: #7a5b55;
  transform: none;
}

/* Bright brand board */
html[data-theme="bright"] .artifact-stage::before {
  inset: 2% 3% 4% 2%;
  border-color: rgba(40, 55, 62, 0.17);
  border-radius: 32% 68% 42% 58%;
}

html[data-theme="bright"] .artifact-object {
  width: 82%;
  height: 78%;
  transform: rotate(1.5deg);
  filter: drop-shadow(0 20px 18px rgba(65, 70, 66, 0.16));
}

html[data-theme="bright"] .artifact-roll {
  display: none;
}

html[data-theme="bright"] .artifact-paper {
  inset: 0;
  padding: 12% 10% 10%;
  background:
    linear-gradient(115deg, transparent 0 87%, rgba(121, 177, 197, 0.18) 87%),
    linear-gradient(25deg, rgba(213, 116, 102, 0.12) 0 9%, transparent 9%),
    var(--paper);
  border: 0;
  clip-path: polygon(0 4%, 8% 4%, 8% 0, 93% 0, 100% 7%, 100% 91%, 94% 91%, 94% 100%, 8% 100%, 0 92%);
  box-shadow: inset 0 0 0 1px rgba(40, 55, 62, 0.13);
}

html[data-theme="bright"] .artifact-paper::before {
  inset: 18px;
  border: 0;
  border-top: 5px solid #78afc5;
  border-right: 5px solid #d57466;
}

html[data-theme="bright"] .artifact-tool {
  right: -3%;
  bottom: 3%;
  width: 9%;
  height: 58%;
  transform: rotate(42deg);
}

html[data-theme="bright"] .artifact-tool::before {
  top: 0;
  left: 20%;
  width: 60%;
  height: 82%;
  background: linear-gradient(90deg, #cb675c, #eb9388 48%, #b95349);
  border-radius: 12px 12px 3px 3px;
  clip-path: none;
}

html[data-theme="bright"] .artifact-tool::after {
  top: 80%;
  left: 25%;
  width: 50%;
  height: 20%;
  background: #28353c;
  clip-path: polygon(50% 100%, 0 0, 100% 0);
  border-radius: 0;
}

html[data-theme="bright"] .artifact-entry {
  padding-left: 15px;
}

html[data-theme="bright"] .artifact-entry::before {
  width: 8px;
  height: 8px;
  border: 0;
  border-radius: 50% 0 50% 50%;
  background: #d57466;
  transform: rotate(-25deg);
}

html[data-theme="bright"] .artifact-entry:nth-child(3n + 2)::before {
  background: #78afc5;
}

html[data-theme="bright"] .artifact-entry:nth-child(3n + 3)::before {
  background: #7fae99;
}

html[data-theme="bright"] .artifact-swatches {
  position: absolute;
  top: 0;
  right: -5%;
  z-index: 6;
  display: flex;
  gap: 4px;
  transform: rotate(4deg);
}

html[data-theme="bright"] .artifact-swatches span {
  width: 28px;
  height: 52px;
  background: #d57466;
  border: 3px solid #fffaf3;
  box-shadow: 0 5px 12px rgba(65, 70, 66, 0.13);
}

html[data-theme="bright"] .artifact-swatches span:nth-child(2) {
  margin-top: 11px;
  background: #78afc5;
}

html[data-theme="bright"] .artifact-swatches span:nth-child(3) {
  margin-top: 4px;
  background: #7fae99;
}

/* Question flow */
.question-layout {
  align-items: start;
}

.question-layout .artifact-panel {
  position: sticky;
  top: 105px;
}

.question-card {
  padding-top: 10px;
}

.progress-head {
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.question-number {
  margin: 0;
  color: var(--accent-strong);
  font-size: 12px;
  font-weight: 750;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.progress-track {
  flex: 1;
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  gap: 5px;
}

.progress-segment {
  height: 4px;
  background: var(--line);
  transform: skewX(-18deg);
}

.progress-segment.is-complete,
.progress-segment.is-current {
  background: var(--accent-strong);
}

.progress-segment.is-current {
  box-shadow: 0 0 0 1px var(--accent-strong);
}

.question-title {
  max-width: 720px;
  margin-bottom: 10px;
  font-size: clamp(30px, 4vw, 52px);
}

.question-hint {
  margin: 0 0 24px;
  color: var(--muted);
  font-size: 14px;
}

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

.option-button {
  position: relative;
  min-height: 74px;
  padding: 14px 15px 14px 48px;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  cursor: pointer;
  text-align: left;
  transition: transform 160ms ease, border-color 160ms ease, background-color 160ms ease;
}

.option-button:hover {
  z-index: 1;
  border-color: var(--line-strong);
  transform: translateY(-2px);
}

.option-button[aria-pressed="true"] {
  color: var(--text);
  background: color-mix(in srgb, var(--accent) 17%, var(--surface));
  border-color: var(--accent-strong);
  box-shadow: inset 4px 0 0 var(--accent-strong);
}

.option-index {
  position: absolute;
  top: 16px;
  left: 15px;
  width: 23px;
  height: 23px;
  display: grid;
  place-items: center;
  color: var(--muted);
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  font-size: 9px;
  font-weight: 800;
}

.option-button[aria-pressed="true"] .option-index {
  color: var(--accent-ink);
  background: var(--accent-strong);
  border-color: var(--accent-strong);
}

.option-label {
  display: block;
  font-weight: 650;
  line-height: 1.3;
}

.question-actions {
  margin-top: 22px;
  justify-content: space-between;
}

.validation-message {
  min-height: 24px;
  margin: 12px 0 0;
  color: var(--warning);
  font-size: 13px;
}

/* Calculation */
.calculation-layout {
  grid-template-columns: minmax(330px, 0.95fr) minmax(360px, 1fr);
}

.calculation-mark {
  position: relative;
  width: 76px;
  height: 76px;
  margin-bottom: 24px;
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  animation: mark-turn 650ms ease both;
}

.calculation-mark::before,
.calculation-mark::after {
  content: "";
  position: absolute;
  inset: 15px;
  border: 1px solid var(--accent-strong);
  transform: rotate(45deg);
}

.calculation-mark::after {
  inset: 26px;
  background: var(--accent-strong);
}

/* Result */
.result-layout {
  align-items: start;
}

.result-layout .artifact-panel {
  position: sticky;
  top: 105px;
}

.result-card {
  min-width: 0;
}

.result-title {
  margin-bottom: 12px;
  font-size: clamp(34px, 4.4vw, 58px);
}

.result-description {
  margin: 0 0 26px;
  color: var(--muted);
  font-size: 18px;
  line-height: 1.55;
}

.result-metrics {
  margin: 0 0 26px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.metric {
  min-height: 112px;
  padding: 17px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
}

.metric dt {
  margin-bottom: 8px;
  color: var(--muted);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.metric dd {
  margin: 0;
  color: var(--text);
  font-family: var(--display);
  font-size: clamp(21px, 2.6vw, 31px);
  line-height: 1.15;
}

.fit-note {
  margin: -14px 0 26px;
  padding: 12px 14px;
  color: var(--text);
  background: color-mix(in srgb, var(--success) 13%, var(--surface));
  border-left: 3px solid var(--success);
  font-size: 14px;
}

.fit-note.is-warning {
  background: color-mix(in srgb, var(--warning) 13%, var(--surface));
  border-left-color: var(--warning);
}

.result-section {
  margin: 0 0 24px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
}

.result-section h3 {
  margin-bottom: 14px;
  font-family: var(--body);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.feature-list {
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 9px 18px;
  list-style: none;
}

.feature-list li {
  position: relative;
  padding-left: 20px;
  color: var(--muted);
}

.feature-list li::before {
  content: "";
  position: absolute;
  top: 8px;
  left: 1px;
  width: 7px;
  height: 7px;
  border: 1px solid var(--accent-strong);
  transform: rotate(45deg);
}

.modifier-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.modifier-chip {
  padding: 7px 10px;
  color: var(--muted);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 13px;
}

.second-result {
  margin: 0 0 24px;
  padding: 14px 16px;
  color: var(--muted);
  border: 1px dashed var(--line-strong);
  border-radius: var(--radius-sm);
}

.estimate-note {
  margin: 16px 0 0;
  color: var(--faint);
  font-size: 12px;
}

/* Dialog */
.examples-dialog {
  width: min(900px, calc(100% - 24px));
  max-height: min(760px, calc(100vh - 24px));
  padding: clamp(20px, 4vw, 38px);
  color: var(--text);
  background: var(--page-soft);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow);
}

.examples-dialog::backdrop {
  background: rgba(10, 8, 12, 0.72);
  backdrop-filter: blur(5px);
}

.dialog-head {
  margin-bottom: 22px;
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 20px;
}

.dialog-head h2 {
  margin-bottom: 0;
}

.icon-button {
  width: 44px;
  height: 44px;
  flex: 0 0 auto;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 50%;
  cursor: pointer;
  font-size: 25px;
  line-height: 1;
}

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

.example-card {
  position: relative;
  min-height: 142px;
  padding: 18px 18px 18px 52px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
}

.example-card:last-child:nth-child(odd) {
  grid-column: 1 / -1;
}

.example-number {
  position: absolute;
  top: 18px;
  left: 17px;
  color: var(--accent-strong);
  font-family: var(--display);
  font-size: 19px;
}

.example-card h3 {
  margin-bottom: 8px;
  font-family: var(--body);
  font-size: 16px;
}

.example-card p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.dialog-start {
  margin-top: 22px;
}

.toast {
  position: fixed;
  right: 18px;
  bottom: 18px;
  z-index: 90;
  max-width: min(360px, calc(100% - 36px));
  padding: 12px 15px;
  color: var(--accent-ink);
  background: var(--accent-strong);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow);
  opacity: 0;
  pointer-events: none;
  transform: translateY(12px);
  transition: opacity 180ms ease, transform 180ms ease;
}

.toast.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@keyframes screen-in {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes ink-reveal {
  from {
    opacity: 0;
    clip-path: inset(0 100% 0 0);
  }
  to {
    opacity: 1;
    clip-path: inset(0 0 0 0);
  }
}

@keyframes mark-turn {
  from {
    opacity: 0.35;
    transform: rotate(-70deg) scale(0.86);
  }
  to {
    opacity: 1;
    transform: rotate(0) scale(1);
  }
}

@media (max-width: 980px) {
  .site-header {
    align-items: flex-start;
  }

  .header-controls {
    align-items: flex-end;
  }

  .theme-picker {
    display: grid;
    grid-template-columns: repeat(3, auto);
  }

  .theme-picker legend {
    grid-column: 1 / -1;
    margin: 0 0 5px;
  }

  .screen-grid {
    grid-template-columns: minmax(290px, 0.82fr) minmax(380px, 1.18fr);
    gap: 30px;
  }

  .artifact-entry {
    min-height: 25px;
  }
}

@media (max-width: 780px) {
  .app-shell {
    padding-inline: 14px;
  }

  .site-header {
    min-height: 0;
    padding: 12px 0;
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 10px;
  }

  .brand-copy small {
    display: none;
  }

  .brand-mark {
    width: 38px;
    height: 38px;
  }

  .header-controls {
    gap: 7px;
  }

  .theme-picker legend {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip: rect(0 0 0 0);
  }

  .theme-picker button {
    min-height: 44px;
    padding: 8px;
    font-size: 12px;
  }

  .language-picker button {
    min-width: 44px;
    min-height: 44px;
    padding: 8px 7px;
    font-size: 12px;
  }

  .screen-grid,
  .calculation-layout {
    min-height: auto;
    padding: 24px 0 42px;
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .start-layout .artifact-panel,
  .question-layout .artifact-panel,
  .result-layout .artifact-panel {
    position: static;
    order: 0;
  }

  .start-layout .screen-copy,
  .question-layout .question-card,
  .result-layout .result-card {
    order: 1;
  }

  .artifact-stage {
    width: min(88vw, 350px);
    max-height: 380px;
  }

  .artifact-object {
    height: 82%;
  }

  .artifact-tool,
  html[data-theme="business"] .artifact-tool,
  html[data-theme="bright"] .artifact-tool {
    right: 32%;
    bottom: 5%;
    height: 48%;
  }

  .artifact-paper {
    padding: 10% 9% 9%;
  }

  .artifact-content.is-complete .artifact-entries {
    gap: 1px;
  }

  .artifact-content.is-complete .artifact-complete-title {
    margin-bottom: 4px;
    padding-bottom: 5px;
    font-size: 15px;
  }

  .artifact-content.is-complete .artifact-entry {
    min-height: 17px;
    padding: 1px 0 2px 11px;
  }

  .artifact-content.is-complete .artifact-entry__label {
    font-size: 6px;
    line-height: 1.05;
  }

  .artifact-content.is-complete .artifact-entry__value {
    font-size: 9px;
    line-height: 1.08;
  }

  h1 {
    font-size: clamp(38px, 11vw, 58px);
  }

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

  .option-button {
    min-height: 62px;
  }

  .site-footer {
    min-height: 52px;
    padding: 14px 0;
    flex-wrap: wrap;
    text-align: center;
  }
}

@media (max-width: 520px) {
  .site-header {
    grid-template-columns: 1fr;
  }

  .brand {
    display: none;
  }

  .header-controls {
    width: 100%;
    justify-content: space-between;
  }

  .theme-picker button {
    padding-inline: 9px;
  }

  .artifact-stage {
    width: min(82vw, 310px);
    max-height: 330px;
  }

  .artifact-caption {
    max-width: 290px;
  }

  .question-title {
    font-size: 32px;
  }

  .progress-head {
    display: grid;
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .result-metrics,
  .feature-list,
  .examples-grid {
    grid-template-columns: 1fr;
  }

  .example-card:last-child:nth-child(odd) {
    grid-column: auto;
  }

  .result-actions,
  .start-actions {
    align-items: stretch;
    flex-direction: column;
  }

  .result-actions button,
  .start-actions button {
    width: 100%;
  }

  .examples-dialog {
    padding: 18px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}