/* Xenocrates — claude.ai-inspired design
   Clean, minimal, warm neutral palette, generous whitespace,
   centered single-column layout, modern sans-serif. */

:root {
  --xen-bg: #ffffff;
  --xen-surface: #ffffff;
  --xen-border: #e5e2dd;
  --xen-text: #2d2d2d;
  --xen-text-muted: #8b8680;
  --xen-accent: #c96442;
  --xen-accent-hover: #b55636;
  --xen-accent-light: #fdf0eb;
  --xen-success: #4a9e6e;
  --xen-input-bg: #f5f4f2;
  --xen-font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --xen-font-mono: "SF Mono", "Fira Code", "Fira Mono", Menlo, monospace;
  --xen-radius: 12px;
  --xen-radius-sm: 8px;
  --xen-max-width: 720px;
  --xen-shadow: 0 1px 3px rgba(0, 0, 0, 0.04), 0 1px 2px rgba(0, 0, 0, 0.06);
}

/* Reset bootstrap's opinionated body */
body {
  font-family: var(--xen-font);
  background-color: var(--xen-bg) !important;
  color: var(--xen-text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* Override navbar — minimal like claude.ai */
.custom-navbar,
.navbar {
  background: var(--xen-bg) !important;
  border-bottom: 1px solid var(--xen-border);
  padding: 0.75rem 1rem;
  box-shadow: none !important;
}
.custom-navbar .navbar-brand,
.navbar .navbar-brand {
  gap: 0;
}
.custom-navbar .navbar-brand img,
.navbar .navbar-brand img {
  display: none;
}
.custom-navbar .navbar-brand span,
.navbar .navbar-brand span {
  font-size: 0.9375rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--xen-text);
}
.no-js nav,
.no-js .navbar,
.no-js .custom-navbar {
    background-color: red !important;
    color: white !important;
}

/* Hide qux jumbotron and cover styles */
.qux-jumbotron { display: none; }

/* Override qux's loading spinner */
#loading { background: var(--xen-bg) !important; }

/* Centered content column */
.xen-container {
  max-width: var(--xen-max-width);
  margin: 0 auto;
  padding: 2rem 1.5rem;
}

/* Subject picker — pill buttons */
.xen-subject-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: center;
  margin-bottom: 1.5rem;
}
.xen-pill {
  display: inline-block;
  padding: 0.5rem 1.25rem;
  border-radius: 999px;
  border: 1px solid var(--xen-border);
  background: var(--xen-surface);
  color: var(--xen-text);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s ease;
  text-decoration: none;
}
.xen-pill:hover {
  border-color: var(--xen-accent);
  color: var(--xen-accent);
  background: var(--xen-accent-light);
}
.xen-pill.active {
  background: var(--xen-accent);
  color: white;
  border-color: var(--xen-accent);
}

/* Purpose toggle — smaller, below subjects */
.xen-purpose-bar {
  display: flex;
  gap: 0.375rem;
  justify-content: center;
  margin-bottom: 2rem;
}
.xen-purpose-btn {
  padding: 0.375rem 1rem;
  border-radius: 999px;
  border: 1px solid var(--xen-border);
  background: transparent;
  color: var(--xen-text-muted);
  font-size: 0.8125rem;
  cursor: pointer;
  transition: all 0.15s ease;
}
.xen-purpose-btn:hover {
  color: var(--xen-text);
  border-color: var(--xen-text-muted);
}
.xen-purpose-btn.active {
  background: var(--xen-text);
  color: white;
  border-color: var(--xen-text);
}

/* Topic dropdown */
.xen-topic-select {
  width: 100%;
  max-width: 400px;
  margin: 0 auto 2rem;
  display: block;
  padding: 0.75rem 1rem;
  border-radius: var(--xen-radius-sm);
  border: 1px solid var(--xen-border);
  background: var(--xen-surface);
  font-size: 0.9375rem;
  color: var(--xen-text);
  appearance: auto;
}

/* The main text input area — chat-style */
.xen-input-area {
  background: var(--xen-surface);
  border: 1px solid var(--xen-border);
  border-radius: var(--xen-radius);
  padding: 1rem;
  box-shadow: var(--xen-shadow);
  margin-bottom: 1.5rem;
}
.xen-input-area textarea {
  width: 100%;
  border: none;
  outline: none;
  resize: none;
  font-family: var(--xen-font);
  font-size: 1rem;
  line-height: 1.5;
  color: var(--xen-text);
  background: transparent;
  min-height: 100px;
}
.xen-input-area textarea::placeholder {
  color: var(--xen-text-muted);
}
.xen-input-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 0.75rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--xen-border);
}

/* Submit button */
.xen-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.625rem 1.5rem;
  border-radius: var(--xen-radius-sm);
  border: none;
  background: var(--xen-accent);
  color: white;
  font-size: 0.9375rem;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.15s ease;
}
.xen-btn:hover {
  background: var(--xen-accent-hover);
}
.xen-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}
.xen-btn-skip {
  background: transparent;
  color: var(--xen-text-muted);
  border: 1px solid var(--xen-border);
}
.xen-btn-skip:hover {
  background: var(--xen-input-bg);
  color: var(--xen-text);
  border-color: var(--xen-text-muted);
}

/* Dashboard cell pair — answered / asked split */
.xen-cell-pair {
  display: flex;
  justify-content: center;
  font-variant-numeric: tabular-nums;
}
.xen-cell-left,
.xen-cell-right {
  min-width: 2ch;
  flex: 1;
  text-align: right;
  text-decoration: none;
  color: var(--xen-accent);
  padding: 0.25rem 0;
}
.xen-cell-left {
  padding-left: 0.25rem;
}
.xen-cell-right {
  padding-right: 0.25rem;
}
.xen-cell-sep {
  padding: 0.25rem 0.25rem;
  color: var(--xen-text-muted);
}
.xen-cell-left:hover, .xen-cell-right:hover {
  text-decoration: underline;
}

/* Session stats bar — sticky, non-scrolling */
.xen-stats-bar {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--xen-bg);
  padding: 0.5rem 0;
  margin-bottom: 1rem;
  border-bottom: 1px solid var(--xen-border);
}
.xen-stats-grid {
  font-variant-numeric: tabular-nums;
}
.xen-stats-col-label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--xen-text-muted);
  padding: 0.25rem 0.5rem;
}
.xen-stats-num {
  font-size: 1rem;
  font-weight: 600;
  padding: 0.125rem 0.5rem;
  color: var(--xen-text);
}
.xen-stats-row-label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--xen-text-muted);
  padding: 0.125rem 0.5rem;
}
@media (min-width: 992px) {
  .col-lg-20pct {
    flex: 0 0 20%;
    max-width: 20%;
  }
}

/* Cards for question/feedback */
.xen-card {
  background: var(--xen-surface);
  border: 1px solid var(--xen-border);
  border-radius: var(--xen-radius);
  padding: 1.5rem;
  margin-bottom: 1rem;
  box-shadow: var(--xen-shadow);
}

/* Question display */
.xen-question-meta {
  font-size: 0.8125rem;
  color: var(--xen-text-muted);
  margin-bottom: 0.75rem;
}
.xen-question-body {
  font-size: 1rem;
  line-height: 1.7;
}
.xen-question-body p { margin-bottom: 0.75rem; }
.xen-question-body p:last-child { margin-bottom: 0; }

/* Score badge */
.xen-score {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.375rem 0.875rem;
  border-radius: 999px;
  font-size: 0.875rem;
  font-weight: 600;
}
.xen-score-7 { background: #e8f5e9; color: #2e7d32; }
.xen-score-6 { background: #e3f2fd; color: #1565c0; }
.xen-score-5 { background: #fff3e0; color: #e65100; }
.xen-score-4 { background: #fff3e0; color: #e65100; }
.xen-score-3 { background: #fce4ec; color: #c62828; }
.xen-score-2 { background: #fce4ec; color: #c62828; }
.xen-score-1 { background: #fce4ec; color: #c62828; }
.xen-score-0 { background: #fce4ec; color: #c62828; }

/* Feedback block */
.xen-feedback {
  background: var(--xen-input-bg);
  border-radius: var(--xen-radius-sm);
  padding: 1rem 1.25rem;
  margin-top: 1rem;
  font-size: 0.9375rem;
  line-height: 1.6;
}
.xen-feedback-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--xen-text-muted);
  margin-bottom: 0.375rem;
}

/* Redirect banner (off-topic) */
.xen-redirect {
  background: #fff8e1;
  border: 1px solid #ffe082;
  border-radius: var(--xen-radius-sm);
  padding: 1rem 1.25rem;
  margin-top: 1rem;
}

/* Error banner */
.xen-error {
  background: #fce4ec;
  border: 1px solid #ef9a9a;
  border-radius: var(--xen-radius-sm);
  padding: 1rem 1.25rem;
  text-align: center;
}

/* History drawer */
.xen-history summary {
  color: var(--xen-text-muted);
  font-size: 0.8125rem;
  cursor: pointer;
  padding: 0.5rem 0;
}
.xen-history summary:hover { color: var(--xen-text); }

/* Spinner */
.xen-spinner {
  color: var(--xen-text-muted);
  font-size: 0.8125rem;
}

/* Full-screen generation overlay (mock-exam paper synthesis) */
.xen-genwait {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--xen-bg, #ffffff);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 9999;
}
.xen-genwait.is-visible { display: flex; }
.xen-genwait-inner {
  text-align: center;
  max-width: 360px;
  padding: 1rem;
}
.xen-genwait-orbit {
  width: 88px;
  height: 88px;
  margin: 0 auto 1.5rem;
  position: relative;
}
.xen-genwait-orbit::before,
.xen-genwait-orbit::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 50%;
  border: 2px solid transparent;
  border-top-color: currentColor;
  animation: xen-genwait-spin 1.4s linear infinite;
}
.xen-genwait-orbit::after {
  inset: 14px;
  border-top-color: transparent;
  border-bottom-color: currentColor;
  opacity: 0.55;
  animation-duration: 2.1s;
  animation-direction: reverse;
}
.xen-genwait-orbit { color: var(--xen-text); }
.xen-genwait-title {
  font-weight: 600;
  margin-bottom: 0.5rem;
}
.xen-genwait-status {
  color: var(--xen-text-muted);
  font-size: 0.9375rem;
  min-height: 1.4em;
  transition: opacity 0.35s ease;
}
.xen-genwait-status.is-fading { opacity: 0; }
@keyframes xen-genwait-spin {
  to { transform: rotate(360deg); }
}

/* Hero / welcome state */
.xen-hero {
  text-align: center;
  padding: 4rem 1rem 2rem;
}
.xen-hero h1 {
  font-size: 1.75rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}
.xen-hero p {
  color: var(--xen-text-muted);
  font-size: 1.0625rem;
  max-width: 480px;
  margin: 0 auto;
}

/* Empty state */
.xen-empty {
  text-align: center;
  padding: 3rem 1rem;
  color: var(--xen-text-muted);
}

/* Responsive */
@media (max-width: 576px) {
  .xen-container { padding: 1rem; }
  .xen-hero { padding: 2rem 0.5rem 1rem; }
  .xen-hero h1 { font-size: 1.375rem; }
  .xen-pill { padding: 0.375rem 1rem; font-size: 0.8125rem; }
}