:root {
  color-scheme: light;
  --bg: #edf1f5;
  --panel: #ffffff;
  --panel-2: #f8fafc;
  --line: #d7e0ea;
  --ink: #121c2b;
  --muted: #66758a;
  --accent: #0f766e;
  --accent-2: #22c7b8;
  --good: #15803d;
  --warn: #b7791f;
  --bad: #c2410c;
  --shadow: 0 22px 60px rgba(28, 40, 56, .12);
  --radius: 8px;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

[data-theme="dark"] {
  color-scheme: dark;
  --bg: #0d1117;
  --panel: #151b23;
  --panel-2: #10161e;
  --line: #2a3545;
  --ink: #eef5ff;
  --muted: #9caabd;
  --accent: #5eead4;
  --accent-2: #2dd4bf;
  --good: #4ade80;
  --warn: #fbbf24;
  --bad: #fb923c;
  --shadow: 0 22px 60px rgba(0, 0, 0, .34);
}

* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--ink);
  font: 14px/1.45 var(--font, inherit);
  -webkit-font-smoothing: antialiased;
}
button {
  min-height: 42px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  padding: 0 16px;
  background: var(--accent);
  color: #06201d;
  font: inherit;
  font-weight: 800;
  cursor: pointer;
}
input {
  width: 100%;
  min-height: 44px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 10px 12px;
  background: var(--panel-2);
  color: var(--ink);
  font: inherit;
  outline: none;
}
input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 20%, transparent);
}
[data-theme="light"] button { color: #ffffff; }
button:hover { filter: brightness(1.05); }
button:disabled { cursor: not-allowed; opacity: .45; }
.secondary,
.subtle-button,
.mini-button {
  background: var(--panel-2);
  color: var(--ink);
  border-color: var(--line);
}
.mini-button.active,
.domain-card.active {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 18%, var(--panel));
}
h1, h2, h3, p { margin: 0; }

.app-shell {
  width: min(1440px, 100%);
  min-height: 100vh;
  margin: 0 auto;
  padding: 18px;
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  gap: 18px;
}
.rail,
.hero-panel,
.panel,
.quiz-panel,
.result-panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  box-shadow: var(--shadow);
}
.rail {
  position: sticky;
  top: 18px;
  height: calc(100vh - 36px);
  padding: 18px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}
.brand {
  display: grid;
  grid-template-columns: 42px 1fr;
  gap: 12px;
  align-items: center;
}
.brand img { width: 42px; height: 42px; border-radius: 9px; }
.brand h1 { font-size: 22px; line-height: 1; }
.brand p,
.rail-status span,
.eyebrow,
.metric span,
.history-row small,
.review-item small {
  color: var(--muted);
}
.rail-status {
  display: grid;
  gap: 4px;
  padding: 14px;
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}
.rail-status strong { font-size: 26px; }
.account-card {
  display: grid;
  gap: 8px;
  padding: 14px;
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}
.account-card span {
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: .08em;
}
.account-card strong {
  overflow: hidden;
  text-overflow: ellipsis;
}
.workspace { display: grid; gap: 16px; align-content: start; }
.hero-panel {
  min-height: 240px;
  padding: clamp(24px, 4vw, 44px);
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 18px;
  align-items: end;
}
.hero-copy { display: grid; gap: 10px; }
.eyebrow {
  font-size: 11px;
  font-weight: 900;
  letter-spacing: .1em;
  text-transform: uppercase;
}
.hero-copy h2 {
  font-size: clamp(44px, 7vw, 92px);
  line-height: .92;
  letter-spacing: 0;
}
.hero-copy p {
  max-width: 560px;
  color: var(--muted);
  font-size: 18px;
}
.hero-actions {
  display: flex;
  gap: 10px;
  align-items: center;
}
.overview-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}
.metric {
  min-height: 116px;
  padding: 18px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  display: grid;
  align-content: space-between;
}
.metric strong {
  font-size: clamp(30px, 4vw, 56px);
  line-height: .9;
}
.muted-metric strong { color: var(--muted); }
.work-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(300px, .8fr);
  gap: 16px;
}
.panel { padding: 18px; }
.panel-heading {
  display: flex;
  justify-content: space-between;
  align-items: start;
  gap: 12px;
  margin-bottom: 14px;
}
.panel-heading h3 { font-size: 24px; }
.domain-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}
.domain-card {
  min-height: 116px;
  padding: 14px;
  display: grid;
  gap: 10px;
  text-align: left;
  color: var(--ink);
  background: var(--panel-2);
  border-color: var(--line);
}
.domain-card span { color: var(--muted); font-weight: 800; }
.domain-card strong { font-size: 34px; line-height: .9; }
.domain-card small { color: var(--muted); }
.history-list { display: grid; gap: 10px; }
.history-row {
  min-height: 64px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  padding: 12px;
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}
.history-row span { display: grid; gap: 2px; }
.history-row strong { font-size: 24px; }
.empty-state {
  padding: 16px;
  border: 1px dashed var(--line);
  border-radius: var(--radius);
  color: var(--muted);
  background: var(--panel-2);
}
.quiz-mount { display: grid; gap: 16px; }
.quiz-panel,
.result-panel {
  padding: clamp(20px, 4vw, 42px);
  display: grid;
  gap: 18px;
}
.quiz-top,
.quiz-footer,
.result-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.quiz-top span,
.topic-pill {
  display: inline-flex;
  width: fit-content;
  min-height: 28px;
  align-items: center;
  padding: 4px 10px;
  border-radius: 999px;
  background: var(--panel-2);
  border: 1px solid var(--line);
  color: var(--muted);
  font-weight: 800;
}
.progress-track {
  height: 8px;
  background: var(--panel-2);
  border-radius: 999px;
  overflow: hidden;
}
.progress-track span {
  display: block;
  height: 100%;
  background: var(--accent-2);
}
.quiz-panel h3 {
  max-width: 950px;
  font-size: clamp(28px, 4vw, 54px);
  line-height: 1.05;
}
.choice-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}
.choice-button {
  min-height: 96px;
  display: grid;
  grid-template-columns: 30px 1fr;
  align-items: start;
  gap: 12px;
  padding: 16px;
  text-align: left;
  white-space: normal;
  color: var(--ink);
  background: var(--panel-2);
  border-color: var(--line);
  line-height: 1.35;
}
.choice-button b {
  width: 30px;
  height: 30px;
  border-radius: 7px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--panel);
  border: 1px solid var(--line);
}
.choice-button.selected {
  background: color-mix(in srgb, var(--accent) 18%, var(--panel));
  border-color: var(--accent);
}
.result-panel h3 {
  color: var(--accent);
  font-size: clamp(64px, 10vw, 120px);
  line-height: .85;
}
.review-list { display: grid; gap: 10px; }
.review-item {
  display: grid;
  gap: 6px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel-2);
}
.loading-screen {
  min-height: 100vh;
  display: grid;
  place-content: center;
  gap: 12px;
  text-align: center;
}
.loader {
  width: 34px;
  height: 34px;
  margin: 0 auto;
  border-radius: 50%;
  border: 3px solid var(--line);
  border-top-color: var(--accent);
  animation: spin .8s linear infinite;
}
.error-text { color: var(--bad); }
.notice-text {
  color: var(--accent);
  background: color-mix(in srgb, var(--accent) 14%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent) 35%, var(--line));
  border-radius: var(--radius);
  padding: 10px 12px;
}
.auth-hint {
  color: var(--muted);
  font-size: 12px;
  line-height: 1.4;
}
@keyframes spin { to { transform: rotate(360deg); } }

.auth-shell {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 20px;
}
.auth-panel {
  width: min(390px, 100%);
  display: grid;
  gap: 18px;
  padding: 28px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  box-shadow: 0 18px 48px rgba(0, 0, 0, .12);
}
.auth-brand {
  grid-template-columns: 40px 1fr;
  align-items: center;
}
.auth-brand img {
  width: 40px;
  height: 40px;
}
.auth-brand h1 { font-size: 22px; }
.auth-brand p { font-size: 13px; }
.auth-copy {
  display: grid;
  gap: 4px;
}
.auth-copy h2 {
  font-size: 28px;
  line-height: 1.1;
}
.auth-copy p {
  color: var(--muted);
  font-size: 14px;
}
.sso-button {
  display: grid;
  grid-template-columns: 24px 1fr;
  align-items: center;
  gap: 10px;
  background: var(--ink);
  color: var(--bg);
  min-height: 46px;
}
.sso-button span {
  display: grid;
  place-items: center;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--panel);
  color: var(--ink);
  font-weight: 900;
}
.auth-panel button:disabled {
  cursor: not-allowed;
  opacity: .62;
}
.auth-divider {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 10px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
}
.auth-divider::before,
.auth-divider::after {
  content: "";
  height: 1px;
  background: var(--line);
}
.auth-form {
  display: grid;
  gap: 10px;
}
.auth-form label {
  display: grid;
  gap: 6px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

@media (max-width: 980px) {
  .app-shell { grid-template-columns: 1fr; }
  .rail {
    position: static;
    height: auto;
    flex-direction: row;
    align-items: center;
  }
  .rail-status { display: none; }
  .hero-panel,
  .work-grid { grid-template-columns: 1fr; }
}

@media (max-width: 680px) {
  .app-shell { padding: 10px; }
  .rail { padding: 12px; }
  .brand { grid-template-columns: 36px 1fr; }
  .brand img { width: 36px; height: 36px; }
  .brand p { display: none; }
  .hero-panel { min-height: 0; }
  .hero-actions,
  .overview-grid,
  .domain-grid,
  .choice-grid,
  .quiz-footer {
    grid-template-columns: 1fr;
    flex-direction: column;
    align-items: stretch;
  }
  .hero-copy h2 { font-size: 44px; }
}