:root {
  font-family: "Noto Sans TC", "Microsoft JhengHei", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: #1c2430;
  background: #f4f5f1;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
}

button,
input,
textarea {
  font: inherit;
}

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

.topbar {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 20px 0 24px;
}

.brand-mark {
  display: grid;
  width: 56px;
  height: 56px;
  place-items: center;
  border-radius: 8px;
  color: #fff;
  background: #0f6b5f;
  font-size: 1.6rem;
  font-weight: 900;
}

h1,
h2,
p {
  margin: 0;
}

h1 {
  font-size: clamp(1.75rem, 2.4vw, 2.5rem);
  line-height: 1.1;
}

.topbar p {
  margin-top: 8px;
  color: #596271;
}

.tabs {
  display: inline-flex;
  gap: 6px;
  padding: 6px;
  margin-bottom: 20px;
  border: 1px solid #d8ddd1;
  border-radius: 8px;
  background: #fff;
}

.tabs button {
  min-height: 42px;
  padding: 0 16px;
  border: 0;
  border-radius: 6px;
  color: #47505e;
  background: transparent;
  cursor: pointer;
}

.tabs button.active {
  color: #fff;
  background: #253041;
}

.workspace-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 0.8fr);
  gap: 20px;
  align-items: start;
}

.hidden {
  display: none;
}

.panel {
  padding: 24px;
  border: 1px solid #d8ddd1;
  border-radius: 8px;
  background: #fff;
  box-shadow: 0 12px 30px rgb(28 36 48 / 0.06);
}

.panel h2 {
  margin-bottom: 18px;
  font-size: 1.25rem;
}

form {
  display: grid;
  gap: 16px;
}

label {
  display: grid;
  gap: 8px;
  color: #374151;
  font-weight: 700;
}

input,
textarea {
  width: 100%;
  border: 1px solid #cfd6c8;
  border-radius: 6px;
  padding: 12px 14px;
  color: #1c2430;
  background: #fbfcfa;
}

textarea {
  resize: vertical;
}

.two-columns {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.primary-action,
.link-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 46px;
  border: 0;
  border-radius: 6px;
  padding: 0 18px;
  color: #fff;
  background: #0f6b5f;
  font-weight: 800;
  text-decoration: none;
  cursor: pointer;
}

.primary-action:disabled {
  cursor: wait;
  opacity: 0.72;
}

.link-button {
  width: 100%;
  margin-top: 12px;
}

.link-button.secondary {
  color: #253041;
  background: #e3e8dc;
}

.error-text {
  color: #b42318;
  font-weight: 700;
}

.empty-state {
  color: #596271;
  line-height: 1.7;
}

.code-box {
  display: grid;
  gap: 8px;
  padding: 16px;
  border-radius: 8px;
  background: #f0f4ec;
}

.code-box span {
  color: #596271;
  font-size: 0.9rem;
}

.code-box strong {
  overflow-wrap: anywhere;
  font-size: 1.35rem;
}

.rubric-list {
  display: grid;
  gap: 12px;
  margin-top: 18px;
}

.rubric-list article {
  padding: 14px;
  border: 1px solid #d8ddd1;
  border-radius: 8px;
}

.rubric-list p,
.feedback {
  margin-top: 8px;
  color: #47505e;
  line-height: 1.65;
}

.score-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
}

.score-grid div {
  display: grid;
  gap: 6px;
  min-height: 76px;
  place-items: center;
  border-radius: 8px;
  background: #f0f4ec;
}

.score-grid span {
  color: #596271;
  font-size: 0.85rem;
}

.score-grid strong {
  display: flex;
  align-items: baseline;
  gap: 2px;
  font-size: 1.7rem;
}

.score-grid small {
  color: #596271;
  font-size: 0.85rem;
  font-weight: 700;
}

@media (max-width: 820px) {
  .workspace-grid,
  .two-columns {
    grid-template-columns: 1fr;
  }

  .tabs {
    display: grid;
    width: 100%;
  }

  .score-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}