/* Language World · The Science Exhibition (/exhibition). Each step wears its studio's material:
   Listening = ocean glass, Reading = editorial paper, Speaking = rose stage, Writing = copper
   manuscript. Tokens come from ds.css; nothing here redefines a shared component. */

.ex-eyebrow {
  margin: 0 0 var(--s-2);
  color: var(--room-ink, var(--ink-2));
  font-size: 0.9375rem;
  font-weight: 700;
}

/* ── hub ─────────────────────────────────────────────────────────────────── */
.ex-hero {
  position: relative;
  isolation: isolate;
  display: grid;
  min-height: clamp(22rem, 46vw, 34rem);
  align-items: end;
  margin-top: var(--s-2);
  border-radius: var(--r-xl);
  overflow: hidden;
  background: var(--mi-950);
  box-shadow: var(--shadow-float);
}
.ex-hero-art {
  position: absolute;
  inset: 0;
  z-index: -2;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 50% 40%;
}
.ex-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    linear-gradient(90deg, rgb(8 14 37 / 94%) 0%, rgb(8 14 37 / 78%) 42%, transparent 75%),
    linear-gradient(0deg, rgb(8 14 37 / 70%), transparent 45%);
}
.ex-hero-copy {
  max-width: 38rem;
  padding: clamp(1.5rem, 4vw, 3rem);
  color: #e6e9f4;
}
.ex-hero .ex-eyebrow {
  color: var(--copper-200);
}
.ex-hero h1 {
  margin: 0 0 var(--s-2);
  color: var(--ivory);
  font-size: clamp(2.2rem, 1.4rem + 2.8vw, 3.6rem);
  line-height: 1.02;
  letter-spacing: -0.03em;
}
.ex-setting {
  margin: 0 0 var(--s-3);
  color: var(--ocean-200);
  font-weight: 700;
}
.ex-summary {
  max-width: 50ch;
  color: #d5dceb;
}
.ex-hero .btn-primary {
  background: linear-gradient(180deg, var(--ivory), #efe6da);
  border-color: transparent;
  color: var(--mi-950);
}
.ex-hero .btn-primary:hover {
  background: linear-gradient(180deg, #fff, var(--copper-200));
  color: var(--mi-950);
}
.ex-ghost-light {
  background: transparent;
  border-color: rgb(255 255 255 / 35%);
  color: var(--ivory);
}
.ex-ghost-light:hover {
  background: rgb(255 255 255 / 10%);
  color: #fff;
}
.ex-hero :focus-visible:not([tabindex="-1"]) {
  outline-color: var(--ivory);
  box-shadow: 0 0 0 6px rgb(8 14 37 / 85%);
}
.ex-hub-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
  gap: var(--s-5);
  margin-top: var(--s-5);
  align-items: start;
}
.ex-hub-grid .panel {
  margin: 0;
}
.ex-hub-side {
  display: grid;
  gap: var(--s-4);
}
.ex-task-list {
  display: grid;
  gap: var(--s-2);
  margin: 0;
  padding: 0;
  list-style: none;
}
.ex-task-list li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: var(--s-3);
  padding: var(--s-3) 0;
  border-top: 1px solid var(--line);
}
.ex-task-list li:first-child {
  border-top: 0;
}
.ex-task-list p {
  margin: 0.15rem 0 0.4rem;
}
.ex-task-dot {
  display: grid;
  place-items: center;
  width: 2.75rem;
  height: 2.75rem;
  border-radius: 14px;
  background: var(--room);
  color: #fff;
  box-shadow: var(--edge-light-dark);
}
.ex-pill {
  display: inline-flex;
  padding: 0.1rem 0.6rem;
  border-radius: 999px;
  background: var(--room-soft);
  color: var(--room-ink);
  font-size: 0.875rem;
  font-weight: 700;
}
.ex-tip {
  display: flex;
  gap: 0.6rem;
  margin: 0;
  padding: var(--s-4);
  border-radius: var(--radius);
  background: var(--sage-200);
  color: var(--sage-900);
  font-weight: 700;
}

/* ── the four-step path ──────────────────────────────────────────────────── */
.ex-path {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--s-2);
  margin: var(--s-5) 0 0;
  padding: 0;
  list-style: none;
}
.ex-path-step a {
  display: flex;
  gap: 0.7rem;
  align-items: center;
  min-height: 3.5rem;
  padding: 0.55rem 0.8rem;
  border: 1.5px solid var(--line);
  border-radius: 14px;
  background: var(--surface);
  color: var(--ink);
  text-decoration: none;
  transition:
    border-color var(--dur-2) var(--ease-out),
    box-shadow var(--dur-2) var(--ease-out);
}
.ex-path-step a:hover {
  border-color: var(--room);
}
.ex-path-n {
  display: grid;
  place-items: center;
  flex: none;
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  border: 2px solid var(--room);
  color: var(--room-ink);
  font-weight: 700;
}
.ex-path-step.is-done .ex-path-n {
  background: var(--room);
  color: #fff;
}
.ex-path-step.is-current a {
  border-color: var(--room);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--room) 20%, transparent);
}
.ex-path-text {
  display: grid;
  line-height: 1.25;
}
.ex-path-text span {
  color: var(--ink-3);
  font-size: 0.875rem;
}

/* ── support choice (shared by the hub and every step) ───────────────────── */
.ex-support {
  margin: 0;
  padding: var(--s-4);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}
.ex-support legend {
  padding: 0 0.25rem;
  font-weight: 700;
}
.ex-support-options {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--s-2);
  margin: var(--s-2) 0;
}
.ex-support-btn {
  display: grid;
  gap: 0.1rem;
  min-height: var(--target);
  padding: 0.5rem 0.7rem;
  border: 1.5px solid var(--line-strong);
  border-radius: 12px;
  background: var(--surface);
  color: var(--ink);
  font: 400 0.9rem/1.3 var(--font);
  text-align: start;
  cursor: pointer;
}
.ex-support-btn strong {
  font-size: 1rem;
}
.ex-support-btn span {
  color: var(--ink-3);
}
.ex-support-btn[aria-pressed="true"] {
  border-color: var(--sage-900);
  background: var(--sage-200);
  box-shadow: inset 0 0 0 1px var(--sage-900);
}
.ex-support-btn[aria-pressed="true"] span {
  color: var(--sage-900);
}
.ex-support .fine {
  margin: 0;
}

/* ── a step ──────────────────────────────────────────────────────────────── */
.ex-step-head {
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
  gap: var(--s-5);
  align-items: end;
}
.ex-step-head h1 {
  margin: 0;
}
.ex-klu {
  display: inline-block;
  margin-inline-start: 0.4rem;
  padding: 0.1rem 0.7rem;
  border-radius: 999px;
  background: var(--room-soft);
  color: var(--room-ink);
  font: 700 1rem/1.6 var(--font);
  letter-spacing: 0;
  vertical-align: middle;
}
.ex-objective {
  margin: var(--s-3) 0 0;
  padding-inline-start: var(--s-3);
  border-inline-start: 3px solid var(--room);
}
.ex-step-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(16rem, 21rem);
  gap: var(--s-5);
  margin-top: var(--s-5);
  align-items: start;
}
.ex-step-main {
  display: grid;
  gap: var(--s-5);
  min-width: 0;
}
.ex-step-foot {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--s-3);
  margin-top: var(--s-6);
  padding-top: var(--s-4);
  border-top: 1px solid var(--line);
}
.ex-kicker {
  margin: 0 0 var(--s-2);
  font-weight: 700;
  font-size: 0.9375rem;
}

/* questions and feedback */
.ex-questions {
  display: grid;
  gap: var(--s-4);
}
.ex-q {
  margin: 0;
  padding: var(--s-4) var(--s-5);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
}
.ex-q.is-right {
  border-color: color-mix(in srgb, var(--right) 45%, var(--line));
}
.ex-q legend {
  float: left;
  width: 100%;
  margin-bottom: var(--s-3);
  font-weight: 700;
  font-size: 1.0625rem;
}
.ex-q legend + * {
  clear: both;
}
.ex-q-n {
  display: inline-grid;
  place-items: center;
  min-width: 1.8rem;
  height: 1.8rem;
  margin-inline-end: 0.4rem;
  border-radius: 8px;
  background: var(--room-soft);
  color: var(--room-ink);
  font-size: 0.9rem;
  font-weight: 700;
}
.ex-options,
.ex-sent-picks {
  display: grid;
  gap: var(--s-2);
}
.ex-option,
.ex-sent-pick {
  display: flex;
  gap: 0.7rem;
  align-items: center;
  min-height: 3rem;
  padding: 0.55rem 0.85rem;
  border: 1.5px solid var(--line-strong);
  border-radius: 12px;
  background: #fff;
  color: var(--ink);
  font: 400 1.0625rem/1.4 var(--font);
  text-align: start;
  cursor: pointer;
  transition:
    border-color var(--dur-2) var(--ease-out),
    background-color var(--dur-2) var(--ease-out),
    transform var(--dur-1) var(--ease-press);
}
.ex-sent-pick {
  font-size: 1rem;
}
.ex-option:hover:not([disabled]),
.ex-sent-pick:hover:not([disabled]) {
  border-color: var(--room);
}
.ex-option:active:not([disabled]),
.ex-sent-pick:active:not([disabled]) {
  transform: scale(0.99);
}
.ex-option[disabled],
.ex-sent-pick[disabled] {
  opacity: 0.55;
  cursor: default;
}
.ex-option-mark {
  display: grid;
  place-items: center;
  flex: none;
  width: 1.8rem;
  height: 1.8rem;
  border-radius: 50%;
  border: 1.5px solid var(--line-strong);
  font-weight: 700;
  font-size: 0.875rem;
}
.ex-option.is-right,
.ex-sent-pick.is-right {
  border-color: var(--right);
  background: var(--right-soft);
}
.ex-option.is-miss,
.ex-sent-pick.is-miss {
  border-color: var(--wrong);
  background: var(--wrong-soft);
}
.ex-feedback {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  align-items: baseline;
  min-height: 1.5rem;
  margin: var(--s-3) 0 0;
}
.ex-q.is-right .ex-feedback {
  color: var(--right);
}
.ex-q.is-try .ex-feedback {
  color: var(--hint);
}

/* Listening · ocean glass stage */
.ex-sound {
  padding: clamp(1.1rem, 2.4vw, 1.75rem);
  border-radius: var(--r-lg);
  color: #e9f6f3;
  background:
    radial-gradient(70% 90% at 10% 0%, rgb(21 150 154 / 45%), transparent 60%),
    repeating-linear-gradient(0deg, rgb(145 226 214 / 6%) 0 1px, transparent 1px 22px),
    linear-gradient(155deg, #0b4b5b, #062c38 65%);
  box-shadow: var(--shadow-lift), var(--edge-light-dark);
}
.ex-sound .ex-kicker {
  color: var(--ocean-200);
}
.ex-sound-head p:last-child {
  margin: 0 0 var(--s-4);
}
.ex-sound .listen-player {
  border-color: rgb(145 226 214 / 35%);
  background: rgb(255 253 248 / 96%);
  color: var(--ink);
}
.ex-map {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--s-2);
  margin: 0;
  padding: 0;
  list-style: none;
}
.ex-map li {
  padding: 0.55rem 0.7rem;
  border: 1.5px dashed var(--line-strong);
  border-radius: 10px;
  font-weight: 700;
  font-size: 0.95rem;
}
.ex-lines {
  display: grid;
  gap: 0.2rem;
  margin: 0;
  padding: 0;
  list-style: none;
}
.ex-transcript p {
  margin: 0 0 var(--s-2);
}

/* Reading · editorial paper */
.ex-page {
  position: relative;
  padding: clamp(1.5rem, 3.6vw, 3rem) clamp(1.25rem, 4vw, 3.5rem);
  border: 1px solid #e6dfd3;
  border-radius: 6px 6px 6px 24px;
  background: var(--grain), linear-gradient(180deg, var(--ivory), #f6f1e8);
  box-shadow:
    0 1px 0 #fff inset,
    0 30px 50px -30px rgb(29 43 88 / 35%),
    10px 10px 0 -4px #ece6dc;
}
.ex-page-kicker {
  margin: 0 0 var(--s-2);
  color: var(--reading-ink);
  font-size: 0.9375rem;
  font-weight: 700;
}
.ex-page h2 {
  margin: 0 0 var(--s-4);
  font-size: clamp(1.5rem, 1.2rem + 1.1vw, 2.1rem);
}
.ex-page-text {
  max-width: 64ch;
  margin: 0;
  font-size: 1.1875rem;
  line-height: 1.8;
}
body[data-lab-band="3-5"] .ex-page-text {
  font-size: 1.3rem;
  line-height: 1.85;
}
.ex-sent sup {
  margin-inline-end: 0.2rem;
  color: var(--reading-ink);
  font-size: 0.7em;
  font-weight: 700;
}
.ex-sent.is-evidence {
  padding: 0.05em 0.15em;
  border-radius: 4px;
  background: linear-gradient(180deg, transparent 40%, var(--copper-200) 40%);
  box-decoration-break: clone;
  -webkit-box-decoration-break: clone;
}
.ex-layers {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
  border-radius: 10px;
  overflow: hidden;
}
.ex-layers li {
  padding: 0.55rem 0.8rem;
  font-size: 0.95rem;
}
.ex-layers li:nth-child(1) {
  background: #c9c0b2;
}
.ex-layers li:nth-child(2) {
  background: #e3cfa9;
}
.ex-layers li:nth-child(3) {
  background: #f1e4c8;
}
.ex-layers li:nth-child(4) {
  background: var(--listening-soft);
}

/* Speaking · rose stage */
.ex-voice {
  padding: clamp(1.25rem, 2.6vw, 2rem);
  border-radius: var(--r-lg);
  color: #f8eef2;
  background:
    radial-gradient(70% 90% at 90% 0%, rgb(219 163 185 / 35%), transparent 60%), var(--grain),
    linear-gradient(160deg, #6f2c4a, var(--rose-900) 75%);
  box-shadow: var(--shadow-lift), var(--edge-light-dark);
}
.ex-voice .ex-kicker {
  color: var(--rose-200);
}
.ex-voice-prompt {
  margin: 0;
  color: var(--ivory);
  font: 500 clamp(1.25rem, 1.05rem + 0.7vw, 1.6rem) / 1.4 var(--font-display);
}
.ex-plan,
.ex-say,
.ex-self,
.ex-draft,
.ex-notes {
  padding: var(--s-5);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}
.ex-plan h2,
.ex-say h2,
.ex-self h2,
.ex-draft h2,
.ex-notes h2 {
  margin: 0 0 var(--s-3);
  font-size: 1.35rem;
}
.ex-plan-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--s-3);
}
.ex-checks {
  display: grid;
  gap: var(--s-2);
  margin: 0;
  padding: 0;
  list-style: none;
}
.ex-checks label {
  display: flex;
  gap: 0.6rem;
  align-items: flex-start;
  min-height: 2.75rem;
  padding: 0.4rem 0;
  cursor: pointer;
}
.ex-checks input {
  width: 1.3rem;
  height: 1.3rem;
  margin-top: 0.15rem;
  accent-color: var(--speaking);
}
.ex-revise {
  margin-top: var(--s-4);
  padding-top: var(--s-4);
  border-top: 1px dashed var(--line-strong);
}
.ex-revise h3 {
  margin: 0 0 var(--s-1);
}
.ex-model {
  margin: 0 0 var(--s-2);
  font-family: var(--font-display);
  font-size: 1.05rem;
}

/* Writing · copper manuscript */
.ex-manuscript {
  padding: clamp(1.25rem, 2.6vw, 2rem);
  border: 1px solid #e7d2b6;
  border-radius: var(--r-lg);
  background: var(--grain), linear-gradient(180deg, #fcf5ea, #f4e5d1);
}
.ex-manuscript .ex-kicker {
  color: var(--writing-ink);
}
.ex-manuscript-prompt {
  margin: 0;
  max-width: 68ch;
  font: 500 clamp(1.1rem, 1rem + 0.4vw, 1.3rem) / 1.55 var(--font-display);
}
.ex-draft-head {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: baseline;
  gap: var(--s-2);
}
.ex-paper {
  display: block;
  width: 100%;
  min-height: 16rem;
  padding: 0.9rem 1rem 0.9rem 3rem;
  border: 1.5px solid #dcc6a8;
  border-radius: 10px;
  background:
    linear-gradient(
      90deg,
      transparent 2.2rem,
      rgb(210 139 88 / 55%) 2.2rem 2.3rem,
      transparent 2.3rem
    ),
    repeating-linear-gradient(
      180deg,
      transparent 0 calc(2rem - 1px),
      #ead9c2 calc(2rem - 1px) 2rem
    ),
    var(--ivory);
  background-position: 0 0.9rem;
  color: var(--ink);
  font: 400 1.125rem/2rem var(--font);
  resize: vertical;
}
.ex-paper:focus-visible {
  border-color: var(--writing);
}
.ex-saved {
  margin: var(--s-2) 0 0;
}
.ex-notes-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
  gap: var(--s-5);
}
.ex-notes h3 {
  margin: 0 0 var(--s-2);
  font-size: 1.05rem;
}
.ex-shows {
  display: grid;
  gap: var(--s-3);
  margin: 0;
  padding: 0;
  list-style: none;
}
.ex-shows li {
  display: grid;
  gap: 0.2rem;
  padding-inline-start: var(--s-3);
  border-inline-start: 3px solid var(--sage-500);
}
.ex-shows q {
  color: var(--ink-2);
  font-style: italic;
}
.ex-next {
  padding: var(--s-4);
  border-radius: var(--radius);
  background: var(--writing-soft);
}
.ex-next p {
  margin: 0 0 var(--s-2);
}
.ex-change {
  display: flex;
  gap: 0.5rem;
  padding: var(--s-3) var(--s-4);
  border-radius: 12px;
  background: var(--sage-200);
  color: var(--sage-900);
  font-weight: 700;
}
.ex-history {
  margin-top: var(--s-4);
}
.ex-paper-quote {
  margin: var(--s-2) 0 0;
  padding: var(--s-3) var(--s-4);
  border-inline-start: 3px solid var(--line-strong);
  background: var(--surface-2);
  white-space: pre-wrap;
}
.ex-organizer {
  display: grid;
  gap: var(--s-2);
}
.ex-organizer textarea {
  min-height: 3.5rem;
}

/* ── help rail ───────────────────────────────────────────────────────────── */
.ex-help {
  padding: var(--s-4);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--grain), var(--surface);
  box-shadow: var(--shadow);
}
.ex-help h2 {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  margin: 0 0 var(--s-2);
  font-size: 1.25rem;
}
.ex-help > .fine {
  margin: 0 0 var(--s-3);
}
.ex-help-list {
  display: grid;
  margin: 0;
  padding: 0;
  list-style: none;
}
.ex-help-list > li {
  border-top: 1px solid var(--line);
}
.ex-help-toggle {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  width: 100%;
  min-height: 3rem;
  padding: 0.4rem 0.2rem;
  border: 0;
  background: none;
  color: var(--ink);
  font: 700 1rem var(--font);
  text-align: start;
  cursor: pointer;
}
.ex-help-toggle .ico {
  color: var(--room-ink);
}
.ex-help-list > li.is-open .ex-help-toggle {
  color: var(--room-ink);
}
.ex-help-body {
  padding: 0 0 var(--s-3) 1.75rem;
}
.ex-frames {
  display: grid;
  gap: var(--s-2);
  margin: 0;
  padding: 0;
  list-style: none;
}
.ex-frames li {
  padding: 0.45rem 0.7rem;
  border-radius: 10px;
  background: var(--room-soft);
  font-family: var(--font-display);
}
.ex-words {
  display: grid;
  gap: var(--s-2);
  margin: 0;
}
.ex-words dt {
  font-weight: 700;
}
.ex-words dd {
  display: grid;
  gap: 0.1rem;
  margin: 0;
  font-size: 0.95rem;
}
.ex-bridge {
  color: var(--room-ink);
  font-weight: 700;
}
.ex-example {
  color: var(--ink-3);
  font-style: italic;
}
.ex-evidence {
  margin: 0;
  padding-inline-start: 1.1rem;
}

/* ── teacher notes ───────────────────────────────────────────────────────── */
.ex-teacher-table {
  width: 100%;
  border-collapse: collapse;
}
.ex-teacher-table th,
.ex-teacher-table td {
  padding: 0.6rem 0.7rem;
  border-bottom: 1px solid var(--line);
  text-align: start;
  vertical-align: top;
}

/* ── grade bands and widths ──────────────────────────────────────────────── */
body[data-lab-band="3-5"] .ex-option,
body[data-lab-band="3-5"] .ex-sent-pick {
  min-height: 3.4rem;
  font-size: 1.125rem;
}
@media (max-width: 980px) {
  .ex-step-head,
  .ex-hub-grid,
  .ex-step-grid {
    grid-template-columns: minmax(0, 1fr);
  }
  .ex-notes-grid {
    grid-template-columns: minmax(0, 1fr);
  }
}
@media (max-width: 640px) {
  .ex-path {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .ex-plan-grid,
  .ex-support-options {
    grid-template-columns: minmax(0, 1fr);
  }
  .ex-hero::before {
    background: linear-gradient(
      0deg,
      rgb(8 14 37 / 96%) 30%,
      rgb(8 14 37 / 55%) 75%,
      rgb(8 14 37 / 20%)
    );
  }
  .ex-q {
    padding: var(--s-4);
  }
  .ex-paper {
    padding-left: 2.75rem;
  }
}