:root {
  --primary-paper: #f7f1df;
  --primary-paper-deep: #eadfbe;
  --primary-ink: #20343b;
  --primary-blue: #1769aa;
  --primary-green: #4b8f3a;
  --primary-red: #d9503f;
  --primary-yellow: #efb632;
  --primary-violet: #7165d6;
}

body.aurora-learning-theme {
  background:
    linear-gradient(rgba(23, 105, 170, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(23, 105, 170, 0.035) 1px, transparent 1px),
    radial-gradient(circle at 8% 4%, rgba(239, 182, 50, 0.18), transparent 24rem),
    radial-gradient(circle at 92% 18%, rgba(75, 143, 58, 0.12), transparent 26rem),
    var(--primary-paper);
  background-size: 32px 32px, 32px 32px, auto, auto, auto;
  color: var(--primary-ink);
}

.sensor-friend-seal {
  background: var(--primary-blue);
  border-color: rgba(255, 255, 255, 0.72);
  box-shadow: 0 10px 28px rgba(23, 105, 170, 0.2);
}

.primary-tabs {
  position: sticky;
  top: 10px;
  z-index: 20;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  margin-bottom: 18px;
  border: 1px solid rgba(32, 52, 59, 0.12);
  background: rgba(255, 253, 245, 0.9);
}

.primary-tabs button:first-child {
  color: var(--primary-blue);
  font-weight: 800;
}

.primary-tabs button.is-active:first-child {
  color: #fff;
  background: var(--primary-blue);
}

.primary-task-board {
  --card-border: rgba(32, 52, 59, 0.12);
  font-family: "PingFang SC", "Hiragino Sans GB", system-ui, sans-serif;
}

section.primary-task-board.is-active {
  display: block !important;
}

.primary-task-board .panel {
  border: 1px solid var(--card-border);
  background: rgba(255, 253, 245, 0.93);
  box-shadow: 0 18px 42px -30px rgba(32, 52, 59, 0.45);
}

.primary-hero {
  display: grid;
  grid-template-columns: minmax(0, 1.65fr) minmax(230px, 0.55fr);
  gap: 28px;
  align-items: stretch;
  padding: clamp(24px, 4vw, 52px);
  overflow: hidden;
  position: relative;
  border-radius: 30px 30px 14px 14px;
}

.primary-hero::before {
  position: absolute;
  content: "";
  width: 420px;
  height: 420px;
  right: -170px;
  top: -240px;
  border: 56px solid rgba(23, 105, 170, 0.08);
  border-radius: 50%;
}

.primary-overline {
  margin: 0 0 8px;
  color: var(--primary-blue);
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.primary-hero h2 {
  max-width: 720px;
  margin: 0;
  color: var(--primary-ink);
  font-family: "STKaiti", "Kaiti SC", "Songti SC", serif;
  font-size: clamp(2rem, 5vw, 4.4rem);
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: -0.035em;
}

.primary-hero-copy > p:not(.primary-overline) {
  max-width: 740px;
  margin: 20px 0 0;
  color: #52676e;
  font-size: clamp(0.95rem, 1.6vw, 1.12rem);
  line-height: 1.8;
}

.primary-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.primary-task-state {
  position: relative;
  display: grid;
  place-content: center;
  min-height: 230px;
  padding: 26px;
  overflow: hidden;
  border: 1px solid rgba(23, 105, 170, 0.18);
  border-radius: 50% 50% 46% 54% / 44% 53% 47% 56%;
  background: #eaf3f9;
  text-align: center;
  transition: background 180ms ease, border-color 180ms ease;
}

.primary-task-state[data-state="running"] {
  border-color: rgba(75, 143, 58, 0.36);
  background: #e7f4df;
}

.primary-task-state[data-state="stopped"] {
  border-color: rgba(217, 80, 63, 0.28);
  background: #f9e8e3;
}

.primary-task-state[data-state="safety"] {
  border-color: var(--primary-red);
  background: #f7d8d0;
}

.primary-task-state small,
.primary-task-state p {
  position: relative;
  z-index: 1;
  margin: 0;
}

.primary-task-state small {
  color: #5c7076;
  font-weight: 700;
  letter-spacing: 0.12em;
}

.primary-task-state strong {
  position: relative;
  z-index: 1;
  margin: 8px 0;
  color: var(--primary-ink);
  font-size: clamp(1.35rem, 2.4vw, 2rem);
}

.primary-task-state p {
  color: #5c7076;
  line-height: 1.55;
}

.primary-state-orbit {
  position: absolute;
  inset: 20%;
  border: 2px dashed rgba(23, 105, 170, 0.2);
  border-radius: 50%;
  animation: primary-orbit 18s linear infinite;
}

.primary-step-line {
  display: grid;
  grid-template-columns: auto 1fr auto 1fr auto 1fr auto;
  gap: 12px;
  align-items: center;
  margin: 18px 0;
  padding: 14px clamp(14px, 3vw, 34px);
  border-block: 1px dashed rgba(32, 52, 59, 0.2);
  color: #52676e;
  font-size: 0.84rem;
  font-weight: 700;
}

.primary-step-line span {
  display: flex;
  align-items: center;
  gap: 7px;
  white-space: nowrap;
}

.primary-step-line b {
  display: inline-grid;
  width: 24px;
  height: 24px;
  place-content: center;
  border-radius: 50%;
  background: var(--primary-blue);
  color: #fff;
}

.primary-step-line i {
  height: 1px;
  background: linear-gradient(90deg, rgba(23, 105, 170, 0.2), rgba(23, 105, 170, 0.65));
}

.primary-sensor-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.primary-sensor-card {
  min-width: 0;
  padding: 22px;
  border-top: 5px solid var(--primary-blue) !important;
  border-radius: 14px 14px 28px 14px;
}

.primary-sensor-card.sensor-sound { border-top-color: var(--primary-violet) !important; }
.primary-sensor-card.sensor-color { border-top-color: var(--primary-yellow) !important; }

.primary-sensor-card header {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 12px;
  align-items: center;
}

.sensor-avatar {
  display: grid;
  width: 48px;
  height: 48px;
  place-content: center;
  border-radius: 16px;
  background: #dcecf7;
  color: var(--primary-blue);
  font-family: "STKaiti", "Kaiti SC", serif;
  font-size: 1.35rem;
  font-weight: 800;
}

.sensor-sound .sensor-avatar { background: #ebe7fb; color: var(--primary-violet); }
.sensor-color .sensor-avatar { background: #fbefd0; color: #9a6810; }

.color-avatar[data-color="green"] { background: #d9efd2; color: var(--primary-green); }
.color-avatar[data-color="red"] { background: #f4d4ce; color: var(--primary-red); }
.color-avatar[data-color="yellow"] { background: #fae7a9; color: #8c6100; }
.color-avatar[data-color="blue"] { background: #d9e8f7; color: var(--primary-blue); }

.primary-sensor-card header small,
.primary-sensor-card header h3,
.primary-sensor-card > p,
.primary-sensor-card footer {
  margin: 0;
}

.primary-sensor-card header small { color: #73858a; }
.primary-sensor-card header h3 { margin-top: 2px; font-size: 1.05rem; }
.primary-sensor-card header > b {
  padding: 5px 8px;
  border-radius: 999px;
  background: #edf1ec;
  color: #62746c;
  font-size: 0.7rem;
  white-space: nowrap;
}

.sensor-number {
  display: flex;
  gap: 8px;
  align-items: baseline;
  margin: 24px 0 6px;
}

.sensor-number strong {
  min-width: 0;
  overflow: hidden;
  color: var(--primary-ink);
  font-family: "SFMono-Regular", Menlo, monospace;
  font-size: clamp(2.1rem, 4vw, 3.4rem);
  letter-spacing: -0.06em;
  text-overflow: ellipsis;
}

.color-number strong { font-family: "STKaiti", "Kaiti SC", serif; letter-spacing: 0; }
.sensor-number span { color: #718187; font-weight: 700; }
.primary-sensor-card > p { color: #687b81; font-family: "SFMono-Regular", Menlo, monospace; font-size: 0.78rem; }
.primary-sensor-card footer { margin-top: 18px; color: #52676e; font-size: 0.76rem; line-height: 1.55; }

.primary-card-lab {
  margin-top: 16px;
  padding: clamp(20px, 3vw, 30px);
  border-radius: 28px 14px 28px 14px;
}

.primary-section-heading {
  display: flex;
  gap: 16px;
  align-items: flex-end;
  justify-content: space-between;
  margin-bottom: 18px;
}

.primary-section-heading h3 { margin: 0; font-size: clamp(1.35rem, 2.5vw, 2rem); }
.primary-section-heading > span {
  padding: 8px 12px;
  border-radius: 999px;
  background: #edf4f5;
  color: #506970;
  font-size: 0.8rem;
  font-weight: 700;
}

.color-card-rail {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.color-command-card {
  min-width: 0;
  padding: 18px;
  overflow: hidden;
  border: 1px solid rgba(32, 52, 59, 0.1);
  border-radius: 12px 12px 24px 12px;
  color: #fff;
  box-shadow: inset 0 -34px 70px rgba(0, 0, 0, 0.12);
}

.color-command-card span,
.color-command-card strong,
.color-command-card p { display: block; margin: 0; }
.color-command-card span { font-size: 0.76rem; font-weight: 700; opacity: 0.82; }
.color-command-card strong { margin: 28px 0 4px; font-family: "STKaiti", "Kaiti SC", serif; font-size: 2rem; }
.color-command-card p { overflow: hidden; font-size: 0.76rem; text-overflow: ellipsis; white-space: nowrap; }
.card-green { background: var(--primary-green); }
.card-red { background: var(--primary-red); }
.card-yellow { background: var(--primary-yellow); color: #42320c; }
.card-blue { background: var(--primary-blue); }

.primary-result-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin-top: 16px;
}

.primary-result-card {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 18px;
  align-items: center;
  padding: 24px;
  border-radius: 14px 28px 14px 28px;
}

.primary-result-card h3,
.primary-result-card p { margin: 0; }
.primary-result-card h3 { font-size: 1.12rem; }
.primary-result-card div > p:last-child { margin-top: 5px; color: #687b81; font-size: 0.82rem; }
.primary-result-card > strong { color: var(--primary-blue); font-family: "SFMono-Regular", Menlo, monospace; font-size: 1.35rem; }

.result-icon {
  display: grid;
  width: 62px;
  height: 62px;
  place-content: center;
  border-radius: 20px;
  background: #edf2e0;
}

.light-result-icon span {
  width: 28px;
  height: 34px;
  border-radius: 50% 50% 42% 42%;
  background: rgba(239, 182, 50, var(--beam, 0.18));
  box-shadow: 0 0 calc(28px * var(--beam, 0.18)) rgba(239, 182, 50, 0.8);
}

.sound-result-icon {
  grid-auto-flow: column;
  gap: 4px;
  background: #eeeafa;
}

.sound-result-icon i { width: 4px; border-radius: 8px; background: var(--primary-violet); }
.sound-result-icon i:nth-child(1) { height: 14px; }
.sound-result-icon i:nth-child(2) { height: 28px; }
.sound-result-icon i:nth-child(3) { height: 20px; }

.primary-proof-note {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 16px;
  align-items: center;
  margin-top: 16px;
  padding: 16px 20px;
  border-left: 5px solid var(--primary-yellow) !important;
  border-radius: 10px;
  color: #586d73;
  font-size: 0.8rem;
}

.primary-proof-note strong { color: var(--primary-ink); white-space: nowrap; }
.primary-proof-note p { margin: 0; line-height: 1.55; }
.primary-proof-note span { color: #7a672e; font-family: "SFMono-Regular", Menlo, monospace; text-align: right; }

.threshold-card-retired {
  border-style: dashed !important;
  opacity: 0.78;
}

@keyframes primary-orbit { to { transform: rotate(360deg); } }

@media (max-width: 920px) {
  .primary-hero { grid-template-columns: 1fr; }
  .primary-task-state { min-height: 180px; border-radius: 24px; }
  .primary-sensor-grid { grid-template-columns: 1fr 1fr; }
  .primary-sensor-card.sensor-color { grid-column: 1 / -1; }
  .color-card-rail { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .primary-result-grid { grid-template-columns: 1fr; }
  .primary-proof-note { grid-template-columns: 1fr; }
  .primary-proof-note span { text-align: left; }
}

@media (max-width: 620px) {
  .primary-tabs {
    position: relative;
    top: auto;
    display: flex;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
  }
  .primary-tabs button { min-width: 88px; scroll-snap-align: start; }
  .primary-hero { padding: 24px 18px; border-radius: 22px 22px 10px 10px; }
  .primary-hero h2 { font-size: 2.25rem; }
  .primary-step-line {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 6px;
    padding-inline: 4px;
  }
  .primary-step-line i { display: none; }
  .primary-step-line span { display: grid; gap: 4px; justify-items: center; text-align: center; white-space: normal; }
  .primary-sensor-grid { grid-template-columns: 1fr; }
  .primary-sensor-card.sensor-color { grid-column: auto; }
  .primary-sensor-card { padding: 18px; }
  .primary-sensor-card header { grid-template-columns: auto minmax(0, 1fr); }
  .primary-sensor-card header > b { grid-column: 2; justify-self: start; }
  .color-card-rail { grid-template-columns: 1fr 1fr; gap: 8px; }
  .color-command-card { padding: 14px; }
  .color-command-card strong { margin-top: 20px; font-size: 1.65rem; }
  .primary-section-heading { display: grid; align-items: start; }
  .primary-section-heading > span { justify-self: start; }
  .primary-result-card { grid-template-columns: auto minmax(0, 1fr); padding: 18px; }
  .primary-result-card > strong { grid-column: 2; }
}

@media (prefers-reduced-motion: reduce) {
  .primary-state-orbit { animation: none; }
  .primary-task-state { transition: none; }
}