/* ============================================================
   anvay.css — Editorial Redesign
   Aesthetic: Scholarly journal × precision instrument
   Palette: Deep ink, warm off-white, electric blue accent
   Fonts: DM Serif Display (headings) + DM Mono (brand/code)
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=DM+Serif+Display:ital@0;1&family=DM+Mono:ital,wght@0,300;0,400;0,500;1,400&family=DM+Sans:ital,opsz,wght@0,9..40,300;0,9..40,400;0,9..40,500;0,9..40,600;1,9..40,400&display=swap');

/* ── Variables ─────────────────────────────────────────────── */
:root {
  --bg:           #f5f2ec;
  --bg-card:      #ffffff;
  --bg-nav:       #1a1814;
  --ink:          #1a1814;
  --ink-muted:    #6b6560;
  --ink-faint:    #b8b3ac;
  --accent:       #0D85D8;
  --accent-dark:  #0968ad;
  --accent-glow:  rgba(13,133,216,0.18);
  --gold:         #c8972a;
  --border:       rgba(26,24,20,0.10);
  --border-strong:rgba(26,24,20,0.20);
  --shadow-sm:    0 1px 3px rgba(26,24,20,0.06), 0 1px 2px rgba(26,24,20,0.04);
  --shadow-md:    0 4px 16px rgba(26,24,20,0.08), 0 1px 4px rgba(26,24,20,0.05);
  --shadow-lg:    0 12px 40px rgba(26,24,20,0.12), 0 4px 12px rgba(26,24,20,0.07);
  --radius:       6px;
  --radius-lg:    12px;
  --font-sans:    'DM Sans', sans-serif;
  --font-serif:   'DM Serif Display', serif;
  --font-mono:    'DM Mono', monospace;
  --nav-h:        60px;
}

[data-theme="dark"] {
  --bg:           #111009;
  --bg-card:      #1c1a16;
  --bg-nav:       #0d0c09;
  --ink:          #ede9e0;
  --ink-muted:    #9e9890;
  --ink-faint:    #4a4740;
  --border:       rgba(237,233,224,0.08);
  --border-strong:rgba(237,233,224,0.16);
  --shadow-sm:    0 1px 3px rgba(0,0,0,0.3);
  --shadow-md:    0 4px 16px rgba(0,0,0,0.4);
  --shadow-lg:    0 12px 40px rgba(0,0,0,0.5);
}

/* ── Reset & Base ───────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.7;
  background-color: var(--bg);
  color: var(--ink);
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

main, .form-section, .report-section { flex: 1; }

/* ── Nav ────────────────────────────────────────────────────── */
nav {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2rem;
  background: var(--bg-nav);
  border-bottom: 1px solid rgba(255,255,255,0.06);
  backdrop-filter: blur(12px);
}

.nav-logo a {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  font-family: var(--font-mono);
  font-weight: 500;
  font-style: italic;
  font-size: 1.25rem;
  color: #f5f2ec;
  letter-spacing: -0.02em;
  transition: color 0.2s;
}
.nav-logo a:hover { color: var(--gold); }

.nav-logo .dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
  flex-shrink: 0;
  transition: background 0.2s;
}
.nav-logo a:hover .dot { background: var(--gold); }

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.nav-links a {
  font-size: 0.825rem;
  font-weight: 500;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  text-decoration: none;
  color: rgba(245,242,236,0.55);
  padding: 0.4rem 0.75rem;
  border-radius: var(--radius);
  transition: color 0.2s, background 0.2s;
}
.nav-links a:hover {
  color: #f5f2ec;
  background: rgba(255,255,255,0.06);
}

.toggle-btn {
  background: none;
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: var(--radius);
  padding: 0.35rem 0.5rem;
  cursor: pointer;
  color: rgba(245,242,236,0.6);
  display: flex;
  align-items: center;
  margin-left: 0.5rem;
  transition: border-color 0.2s, color 0.2s;
}
.toggle-btn:hover {
  border-color: rgba(255,255,255,0.3);
  color: #f5f2ec;
}

/* ── Page Layout ────────────────────────────────────────────── */
.page-container {
  max-width: 860px;
  margin: 3rem auto;
  padding: 0 1.5rem;
}

.form-section {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  margin: 2rem auto;
  max-width: 860px;
  box-shadow: var(--shadow-md);
}

/* ── Page Headings ──────────────────────────────────────────── */
.upload-heading {
  font-family: var(--font-serif);
  font-size: 2rem;
  font-weight: 400;
  color: var(--ink);
  letter-spacing: -0.02em;
  margin-bottom: 0.5rem;
  text-align: left;
}

.upload-subheading {
  font-size: 0.9rem;
  color: var(--ink-muted);
  margin-bottom: 2rem;
  text-align: left;
}

/* ── Rule divider ───────────────────────────────────────────── */
.section-rule {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2rem 0;
}

/* ── Typography ─────────────────────────────────────────────── */
h2, h3 { font-family: var(--font-serif); font-weight: 400; color: var(--ink); }
h4 { font-weight: 600; font-size: 0.95rem; letter-spacing: 0.02em; text-transform: uppercase; color: var(--ink-muted); }
h5 { font-weight: 600; font-size: 1rem; color: var(--ink); }

p { color: var(--ink); margin-bottom: 1rem; }
strong { font-weight: 600; }

/* ── Form Controls ──────────────────────────────────────────── */
.form-label {
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ink-muted);
  margin-bottom: 0.4rem;
}

.form-control, .form-select {
  background: var(--bg);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 0.9rem;
  padding: 0.55rem 0.85rem;
  transition: border-color 0.2s, box-shadow 0.2s;
  box-shadow: none;
}
.form-control:focus, .form-select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
  outline: none;
  background: var(--bg-card);
}
[data-theme="dark"] .form-control,
[data-theme="dark"] .form-select {
  background: rgba(255,255,255,0.04);
  color: var(--ink);
}
[data-theme="dark"] .form-control:focus,
[data-theme="dark"] .form-select:focus {
  background: rgba(255,255,255,0.07);
}

.form-text {
  font-size: 0.78rem;
  color: var(--ink-faint);
  margin-top: 0.3rem;
}

/* Info icon */
.bi-info-circle { color: var(--ink-faint); cursor: help; }

/* ── Range Slider ───────────────────────────────────────────── */
input[type="range"] {
  -webkit-appearance: none;
  width: 100%;
  height: 4px;
  border-radius: 2px;
  background: var(--border-strong);
  cursor: pointer;
  outline: none;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 16px; height: 16px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--bg-card);
  box-shadow: 0 0 0 1px var(--accent);
  cursor: pointer;
  transition: transform 0.15s;
}
input[type="range"]::-webkit-slider-thumb:hover { transform: scale(1.2); }

/* ── Buttons ────────────────────────────────────────────────── */
.btn-accent {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  background: var(--accent);
  color: #fff !important;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.875rem;
  letter-spacing: 0.02em;
  padding: 0.65rem 1.75rem;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  text-decoration: none;
  transition: background 0.2s, box-shadow 0.2s, transform 0.15s;
  box-shadow: 0 1px 3px rgba(13,133,216,0.3);
}
.btn-accent:hover {
  background: var(--accent-dark);
  box-shadow: 0 4px 16px rgba(13,133,216,0.35);
  transform: translateY(-1px);
  color: #fff !important;
}
.btn-accent:active { transform: translateY(0); }

.btn-outline-secondary {
  background: none;
  border: 1px solid var(--border-strong);
  color: var(--ink-muted) !important;
  font-size: 0.78rem;
  font-weight: 500;
  padding: 0.3rem 0.75rem;
  border-radius: var(--radius);
  cursor: pointer;
  text-decoration: none;
  transition: border-color 0.2s, color 0.2s, background 0.2s;
}
.btn-outline-secondary:hover {
  border-color: var(--accent);
  color: var(--accent) !important;
  background: var(--accent-glow);
}

/* ── Advanced Toggle ────────────────────────────────────────── */
.advanced-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-muted);
  text-decoration: none;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  padding: 0.4rem 0.9rem;
  transition: color 0.2s, border-color 0.2s, background 0.2s;
}
.advanced-toggle:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--accent-glow);
}
.toggle-label { font-size: 0.7rem; }

/* ── Advanced section ───────────────────────────────────────── */
.advanced-section-label {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-faint);
  padding: 0.75rem 0 0.5rem;
}

/* ── Loading Overlay ────────────────────────────────────────── */
#loading-overlay {
  position: fixed;
  inset: 0;
  background: rgba(26,24,20,0.65);
  backdrop-filter: blur(4px);
  display: none;
  z-index: 2000;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 1.25rem;
}
#loading-overlay.active { display: flex; }

.spinner {
  width: 44px;
  height: 44px;
  border: 3px solid rgba(245,242,236,0.15);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.75s linear infinite;
}
.loading-label {
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(245,242,236,0.5);
  font-family: var(--font-mono);
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ── Result Tabs ────────────────────────────────────────────── */
.tabs {
  display: flex;
  justify-content: center;
  gap: 0;
  border-bottom: 1px solid var(--border);
  background: var(--bg-card);
  padding: 0 1.5rem;
  position: sticky;
  top: var(--nav-h);
  z-index: 90;
}
.tabs button {
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  padding: 0.9rem 1.25rem;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-muted);
  cursor: pointer;
  transition: color 0.2s, border-color 0.2s;
  margin-bottom: -1px;
}
.tabs button:hover { color: var(--ink); }
.tabs button.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}
.tabs button em {
  font-style: italic;
  font-family: var(--font-mono);
}

.tab-content { display: none; }
.tab-content.active { display: block; }

/* ── Viz Cards ──────────────────────────────────────────────── */
#visualizations .container-fluid { padding: 1.5rem; }

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1rem;
  box-shadow: var(--shadow-sm);
  min-height: 420px;
  display: flex;
  flex-direction: column;
  transition: box-shadow 0.2s;
}
.card:hover { box-shadow: var(--shadow-md); }

.card-title {
  font-size: 0.75rem !important;
  font-weight: 600 !important;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--ink-muted) !important;
  margin-bottom: 0;
}

.lightbox-body {
  flex: 1;
  display: flex;
  align-items: stretch;
}
.chart-frame { flex: 1; }
.chart-frame iframe { border: none; width: 100%; height: 100%; min-height: 360px; }

.expand-btn {
  background: none;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--ink-faint);
  font-size: 0.75rem;
  padding: 0.2rem 0.5rem;
  cursor: pointer;
  transition: border-color 0.2s, color 0.2s;
}
.expand-btn:hover { border-color: var(--accent); color: var(--accent); }

/* ── Report Sections ────────────────────────────────────────── */
.report-section {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  margin: 1.25rem auto;
  max-width: 1000px;
  box-shadow: var(--shadow-sm);
}
.report-section + .report-section { margin-top: 1.25rem; }

.report-section h4 {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-bottom: 1.25rem;
}
.report-section h6 { font-weight: 600; color: var(--ink); font-size: 0.9rem; }

/* ── Tables ─────────────────────────────────────────────────── */
.table {
  width: 100%;
  font-size: 0.875rem;
  border-collapse: collapse;
  color: var(--ink);
}
.table th {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-faint);
  padding: 0.6rem 0.75rem;
  border-bottom: 2px solid var(--border-strong);
  background: transparent;
  white-space: nowrap;
}
.table td {
  padding: 0.55rem 0.75rem;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
}
.table tbody tr:last-child td { border-bottom: none; }
.table tbody tr:hover { background: rgba(13,133,216,0.04); }
.table-bordered td, .table-bordered th {
  border: 1px solid var(--border);
}

/* ── Collapsible Cards ──────────────────────────────────────── */
.collapsible-card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 0.75rem;
  overflow: hidden;
}
.collapsible-toggle {
  width: 100%;
  background: var(--bg);
  color: var(--ink);
  font-size: 0.85rem;
  font-weight: 600;
  text-align: left;
  padding: 0.85rem 1rem;
  border: none;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: background 0.2s;
}
.collapsible-toggle:hover { background: rgba(13,133,216,0.05); }
.collapsible-toggle::after {
  content: "+";
  font-size: 1rem;
  color: var(--ink-faint);
  font-weight: 300;
  flex-shrink: 0;
}
.collapsible-card.active .collapsible-toggle::after { content: "−"; }
.collapsible-content {
  display: none;
  padding: 1rem;
  background: var(--bg-card);
  border-top: 1px solid var(--border);
  font-size: 0.875rem;
}
.collapsible-card.active .collapsible-content { display: block; }

/* ── Scroll sections ────────────────────────────────────────── */
.scroll-section {
  max-height: 420px;
  overflow-y: auto;
  padding-right: 0.5rem;
}
.scroll-section::-webkit-scrollbar { width: 4px; }
.scroll-section::-webkit-scrollbar-track { background: transparent; }
.scroll-section::-webkit-scrollbar-thumb { background: var(--border-strong); border-radius: 2px; }

.scrollable-table { overflow-x: auto; }

.sticky-header {
  position: sticky;
  top: 0;
  background: var(--bg-card);
  z-index: 10;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 0.75rem;
}

/* ── Docs Tabs ──────────────────────────────────────────────── */
.form-section .tabs {
  position: static;
  background: none;
  padding: 0;
  margin-bottom: 2rem;
  border-bottom-color: var(--border);
}
.form-section .tabs button {
  padding: 0.75rem 1rem;
  font-size: 0.75rem;
}
.form-section > .tab-content { display: none; margin-top: 0; }
.form-section > .tab-content.active { display: block; }

/* ── Doc card reveals ───────────────────────────────────────── */
.card.question-reveal {
  min-height: 180px;
  cursor: pointer;
  transition: background 0.3s, color 0.3s;
}
.card.question-reveal .card-body {
  height: 100%;
  display: flex;
  flex-direction: column;
}
.card.question-reveal .card-question,
.card.question-reveal .card-answer { font-size: 0.875rem; line-height: 1.6; }
.card.question-reveal .card-answer { display: none; }
.card.question-reveal:hover { background: var(--accent) !important; color: #fff !important; }
.card.question-reveal:hover .card-title,
.card.question-reveal:hover .card-question { color: rgba(255,255,255,0.7) !important; }
.card.question-reveal:hover .card-answer { display: block; color: #fff; }
.card.question-reveal:hover .card-question { display: none; }

/* ── Workflow steps (docs) ──────────────────────────────────── */
.workflow-steps {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
  padding: 1.25rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  margin: 1rem 0;
}
.workflow-step {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  flex: 1;
  min-width: 90px;
  gap: 0.25rem;
}
.workflow-step i { font-size: 1.2rem; color: var(--accent); }
.workflow-step strong { font-size: 0.8rem; }
.workflow-step small { font-size: 0.72rem; color: var(--ink-muted); }
.workflow-arrow { color: var(--ink-faint); font-size: 1rem; }

/* ── Usage nav pills (docs) ─────────────────────────────────── */
#usage .nav-pills .nav-link {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--ink-muted);
  border-radius: var(--radius);
  padding: 0.4rem 0.85rem;
  letter-spacing: 0.03em;
}
#usage .nav-pills .nav-link.active {
  background: var(--accent);
  color: #fff;
}
.usage-pane { display: none; opacity: 0; transition: opacity 0.3s; }
.usage-pane.active { display: block; opacity: 1; }

/* ── Code / Pre ─────────────────────────────────────────────── */
pre, code {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.2em 0.5em;
}
pre { padding: 1rem; white-space: pre-wrap; word-break: break-word; }
.card pre { border: none; background: transparent; padding: 0; }

/* ── LDA game ───────────────────────────────────────────────── */
.topic-word { color: var(--accent); font-weight: 600; }
.stopword { color: var(--ink-faint); font-style: italic; }

/* ── Alert ──────────────────────────────────────────────────── */
.alert {
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--ink);
  font-size: 0.875rem;
  padding: 0.75rem 1rem;
}
.alert-danger { border-color: rgba(220,50,50,0.3); background: rgba(220,50,50,0.06); }

/* ── Footer ─────────────────────────────────────────────────── */
footer {
  padding: 1.75rem 2rem;
  border-top: 1px solid var(--border);
  background: var(--bg);
  margin-top: auto;
}
.footer-inner {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.6rem;
}
.footer-links {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0;
}
.footer-links a {
  font-size: 0.75rem;
  color: var(--ink-faint);
  text-decoration: none;
  padding: 0.1rem 0.5rem;
  transition: color 0.2s;
}
.footer-links a:hover { color: var(--accent); }
.footer-links a + a {
  border-left: 1px solid var(--border-strong);
}
.footer-copy {
  font-size: 0.72rem;
  color: var(--ink-faint);
  text-align: center;
  margin: 0;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}
.footer-brand-inline {
  font-family: var(--font-mono);
  font-weight: 500;
  font-style: italic;
  color: var(--ink-muted);
}
.footer-brand-inline .dot {
  display: inline-block;
  width: 5px; height: 5px;
  border-radius: 50%;
  background: var(--accent);
  margin-right: 0.3rem;
  vertical-align: middle;
}
.footer-version {
  opacity: 0.45;
  font-size: 0.68rem;
}
.footer-sep {
  color: var(--border-strong);
  font-size: 0.65rem;
}

/* ── Utility ────────────────────────────────────────────────── */
.text-accent { color: var(--accent); text-decoration: none; }
.text-accent:hover { text-decoration: underline; }
.text-muted { color: var(--ink-muted) !important; }
.small { font-size: 0.85rem; }

/* Bootstrap overrides for list-group */
.list-group-item {
  background: transparent;
  border-color: var(--border);
  color: var(--ink);
}

/* Docs glossary */
#glossarySearch { max-width: 380px; }

/* Modal */
.modal-content {
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--ink);
}
.modal-header { border-bottom-color: var(--border); }
.btn-close { filter: invert(var(--btn-close-invert, 0)); }
[data-theme="dark"] { --btn-close-invert: 1; }

/* Responsive */
@media (max-width: 768px) {
  nav { padding: 0 1rem; }
  .form-section { padding: 1.5rem; margin: 1rem; }
  .report-section { padding: 1.25rem; margin: 0.75rem; }
  .tabs { padding: 0 0.5rem; }
  .tabs button { padding: 0.75rem 0.6rem; font-size: 0.7rem; }
  .upload-heading { font-size: 1.6rem; }
  .footer-inner { gap: 0.5rem; }
  .nav-links a { display: none; }
  .nav-links a:last-of-type { display: inline; }
}

/* ── Page-specific: upload form spacing ─────────────────────── */
.form-section .row > [class^="col-"] { margin-bottom: 1.25rem; }
#visualizations, #report { display: none; margin-top: 2rem; }
#visualizations.active, #report.active { display: block; }

/* ── Tooltip override ───────────────────────────────────────── */
.tooltip-inner {
  font-size: 0.78rem;
  background: var(--ink);
  border-radius: var(--radius);
  padding: 0.4rem 0.7rem;
}