:root {
  color-scheme: light;
  --bg: #f5f7f4;
  --surface: #ffffff;
  --surface-muted: #eef2ec;
  --text: #18201b;
  --muted: #5b665f;
  --line: #d8dfd5;
  --accent: #19764b;
  --accent-dark: #105c39;
  --danger: #a93a2f;
  --warn: #b45f1a;
  --warn-bg: #fff6eb;
  --weak: #a93a2f;
  --weak-bg: #fdf2f1;
  --good: #1a6b8f;
  --good-bg: #eef7fb;
  --strong: #19764b;
  --strong-bg: #f0faf3;
  --neutral: #6b7570;
  --neutral-bg: #f4f5f4;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  letter-spacing: 0;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

.workspace {
  display: none;
  grid-template-columns: minmax(260px, 320px) minmax(360px, 1fr) minmax(280px, 360px);
  gap: 1px;
  min-height: 100vh;
  background: var(--line);
}

.setup-pane,
.practice-pane,
.feedback-pane {
  background: var(--surface);
  padding: 28px;
}

.practice-pane {
  display: flex;
  flex-direction: column;
  gap: 22px;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--accent);
  font-size: 12px;
  font-weight: 750;
  letter-spacing: 0.06em;
}

html[lang="ko"] .eyebrow {
  text-transform: none;
  letter-spacing: 0.02em;
}

h1,
h2 {
  margin: 0;
  line-height: 1.08;
}

h1 {
  font-size: clamp(36px, 5vw, 64px);
  line-height: 1.05;
}

h2 {
  font-size: 22px;
}

.lede {
  max-width: 28ch;
  margin: 18px 0 30px;
  color: var(--muted);
  line-height: 1.5;
}

.stacked-form,
.answer-form {
  display: grid;
  gap: 14px;
}

.material-form,
.asset-form {
  align-items: end;
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(2, minmax(180px, 1fr)) auto;
}

.wide-field {
  grid-column: 1 / -1;
}

label {
  display: grid;
  gap: 7px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 650;
}

input,
textarea,
select {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fbfcfa;
  color: var(--text);
  padding: 12px;
  outline: none;
  appearance: none;
}

select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%235b665f' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 36px;
}

textarea {
  min-height: 160px;
  resize: vertical;
  line-height: 1.45;
}

input:focus,
textarea:focus,
select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(25, 118, 75, 0.12);
}

button {
  min-height: 44px;
  border: 0;
  border-radius: 6px;
  background: var(--accent);
  color: #fff;
  cursor: pointer;
  font-weight: 750;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  position: relative;
}

button:hover:not(:disabled) {
  background: var(--accent-dark);
}

button:active:not(:disabled) {
  transform: translateY(1px);
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.48;
}

.btn-spinner {
  display: none;
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255, 255, 255, 0.35);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

button.is-loading .btn-text {
  opacity: 0.9;
}

button.is-loading .btn-spinner {
  display: inline-block;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.status-line {
  display: flex;
  align-items: center;
  gap: 8px;
  min-height: 20px;
  margin: 18px 0 0;
  font-size: 13px;
  color: var(--muted);
}

.status-icon {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
}

.status-line.is-busy .status-icon {
  background: var(--warn);
  animation: pulse 1.2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.35;
  }
}

.error-line {
  min-height: 20px;
  margin: 10px 0 0;
  font-size: 13px;
  color: var(--danger);
}

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

.question-list {
  display: grid;
  gap: 10px;
}

.question-button {
  border: 1px solid var(--line);
  border-left: 3px solid transparent;
  background: #fbfcfa;
  color: var(--text);
  padding: 16px;
  min-height: 72px;
  text-align: left;
  border-radius: 6px;
  transition: border-color 0.15s ease, background 0.15s ease;
}

.question-button:hover:not(:disabled) {
  border-color: var(--accent);
}

.question-button[aria-pressed="true"] {
  border-color: var(--accent);
  border-left-color: var(--accent);
  background: var(--surface-muted);
}

.question-id {
  display: block;
  margin-bottom: 5px;
  color: var(--accent);
  font-size: 12px;
  font-weight: 750;
}

.empty-state {
  border: 1px dashed var(--line);
  border-radius: 6px;
  color: var(--muted);
  padding: 22px 18px;
  text-align: center;
  font-size: 13px;
  line-height: 1.5;
}

.empty-hint::before {
  content: "";
  display: block;
  width: 24px;
  height: 24px;
  margin: 0 auto 10px;
  opacity: 0.45;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%235b665f' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Ccircle cx='12' cy='12' r='10'/%3E%3Cpath d='M12 16v-4'/%3E%3Cpath d='M12 8h.01'/%3E%3C/svg%3E");
  background-size: contain;
}

.feedback {
  display: grid;
  gap: 16px;
  margin-top: 22px;
}

.progress-heading {
  margin-top: 34px;
}

.small-button {
  min-height: 34px;
  padding: 0 12px;
  font-size: 12px;
}

.metric-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px;
  padding: 10px 0;
  border-bottom: 1px solid var(--line);
}

.metric-row:last-child {
  border-bottom: 0;
}

.grade {
  font-size: 38px;
  font-weight: 800;
  line-height: 1.1;
}

.grade-miss {
  color: var(--weak);
}

.grade-partial {
  color: var(--warn);
}

.grade-solid {
  color: var(--good);
}

.grade-strong {
  color: var(--strong);
}

.readiness-value {
  color: var(--accent);
  font-size: 48px;
  font-weight: 850;
  line-height: 1;
}

.concept-pill {
  display: inline-flex;
  margin: 4px 6px 4px 0;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 6px 10px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 650;
  background: var(--surface);
}

.pill-neutral {
  background: var(--neutral-bg);
  border-color: #d5dad3;
  color: var(--neutral);
}

.pill-weak {
  background: var(--weak-bg);
  border-color: #e8bdb9;
  color: var(--weak);
}

.pill-warn {
  background: var(--warn-bg);
  border-color: #edd5b5;
  color: var(--warn);
}

.pill-good {
  background: var(--good-bg);
  border-color: #b8d9e8;
  color: var(--good);
}

.pill-strong {
  background: var(--strong-bg);
  border-color: #b8dfc6;
  color: var(--strong);
}

.small-list {
  margin: 0;
  padding-left: 18px;
  color: var(--muted);
  line-height: 1.45;
}

.content-workspace {
  border-top: 2px solid var(--line);
  display: grid;
  gap: 18px;
  padding-top: 28px;
  margin-top: 6px;
}

.ontology-view {
  display: grid;
  gap: 12px;
}

.summary-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.summary-chip {
  background: var(--surface-muted);
  border-radius: 999px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 750;
  padding: 7px 12px;
}

.prompt-text {
  background: #fbfcfa;
  border: 1px solid var(--line);
  border-radius: 6px;
  margin: 0;
  padding: 14px;
  white-space: pre-wrap;
  font-size: 13px;
  line-height: 1.5;
  color: var(--text);
}

.login-view {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 28px;
  background: linear-gradient(160deg, #f5f7f4 0%, #e8efe5 100%);
}

.login-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 52px 40px 44px;
  max-width: 440px;
  width: 100%;
  text-align: center;
  box-shadow: 0 12px 40px rgba(24, 32, 27, 0.07);
}

.login-card .eyebrow {
  display: inline-block;
  letter-spacing: 0.14em;
  font-size: 11px;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 750;
  margin-bottom: 10px;
}

html[lang="ko"] .login-card .eyebrow {
  text-transform: none;
  letter-spacing: 0.04em;
}

.login-card h1 {
  font-size: clamp(34px, 5.5vw, 56px);
  margin: 8px 0 18px;
  line-height: 1.05;
}

.login-card .lede {
  margin: 0 auto 32px;
  max-width: 32ch;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.55;
}

.login-divider {
  height: 1px;
  background: var(--line);
  margin: 28px 0 24px;
  position: relative;
}

.login-divider::before {
  content: attr(data-label);
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: var(--surface);
  padding: 0 12px;
  color: var(--muted);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.login-legal {
  margin-top: 18px;
  font-size: 12px;
  color: var(--muted);
  line-height: 1.5;
}

.login-legal a {
  color: var(--muted);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.login-error {
  margin-top: 14px;
  padding: 10px 14px;
  border-radius: 8px;
  background: var(--weak-bg);
  color: var(--weak);
  font-size: 13px;
  display: none;
}
.login-error.visible {
  display: block;
}

.user-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 18px;
  padding: 10px 12px;
  background: var(--surface-muted);
  border-radius: 6px;
}

.user-info {
  font-size: 13px;
  font-weight: 650;
  color: var(--text);
}

@media (max-width: 980px) {
  .workspace {
    grid-template-columns: 1fr;
  }

  h1 {
    font-size: 42px;
  }

  .material-form,
  .asset-form {
    grid-template-columns: 1fr;
  }
}