/* ============================================================
   DESIGN SYSTEM — docs.benjacode.com
   Dark theme, Inter font, emerald/cyan accent palette
   ============================================================ */

/* ---------- RESET & BASE ---------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  /* Colors */
  --bg:           #0B1220;
  --surface:      #111A2E;
  --surface2:     #162035;
  --card-border:  rgba(255,255,255,0.08);
  --text:         #E6EDF7;
  --muted:        #94A3B8;
  --accent:       #10B981;
  --accent-dim:   rgba(16,185,129,0.15);
  --accent-glow:  rgba(16,185,129,0.35);
  --cyan:         #22D3EE;
  --cyan-dim:     rgba(34,211,238,0.15);
  --amber:        #F59E0B;
  --amber-dim:    rgba(245,158,11,0.15);
  --danger:       #EF4444;
  --danger-dim:   rgba(239,68,68,0.15);

  /* Typography */
  --font:         'Inter', system-ui, -apple-system, sans-serif;
  --font-mono:    'JetBrains Mono', 'Fira Code', monospace;

  /* Layout */
  --max-w:        1100px;
  --nav-h:        60px;
  --radius:       16px;
  --radius-sm:    8px;
  --radius-xs:    4px;

  /* Shadows */
  --shadow-card:  0 4px 24px rgba(0,0,0,0.35);
  --shadow-glow:  0 0 24px rgba(16,185,129,0.18);
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

/* ---------- TYPOGRAPHY ---------- */
h1, h2, h3, h4 {
  line-height: 1.25;
  font-weight: 700;
  color: var(--text);
}

h1 { font-size: clamp(2rem, 4vw, 3.25rem); letter-spacing: -0.03em; }
h2 { font-size: clamp(1.5rem, 3vw, 2.25rem); letter-spacing: -0.02em; }
h3 { font-size: clamp(1.1rem, 2vw, 1.5rem); }
h4 { font-size: 1rem; }

p { color: var(--muted); max-width: 72ch; }
p + p { margin-top: 0.85em; }

strong { color: var(--text); font-weight: 600; }
a { color: var(--accent); text-decoration: none; transition: color 0.2s; }
a:hover, a:focus-visible { color: var(--cyan); text-decoration: underline; }

code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background: rgba(255,255,255,0.07);
  padding: 0.1em 0.35em;
  border-radius: var(--radius-xs);
  color: var(--cyan);
}

/* ---------- LAYOUT ---------- */
.container {
  max-width: var(--max-w);
  margin-inline: auto;
  padding-inline: clamp(1rem, 4vw, 2rem);
}

section {
  padding-block: clamp(3rem, 6vw, 5rem);
}

section + section {
  border-top: 1px solid var(--card-border);
}

/* ---------- NAVIGATION ---------- */
#site-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(11,18,32,0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--card-border);
  height: var(--nav-h);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  gap: 1.5rem;
}

.nav-wordmark {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--text) !important;
  text-decoration: none !important;
  letter-spacing: -0.03em;
  white-space: nowrap;
  flex-shrink: 0;
}

.nav-wordmark span { color: var(--accent); }

.nav-links {
  display: flex;
  gap: 0.25rem;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

.nav-links::-webkit-scrollbar { display: none; }

.nav-links a {
  color: var(--muted);
  font-size: 0.875rem;
  font-weight: 500;
  padding: 0.35rem 0.6rem;
  border-radius: var(--radius-xs);
  white-space: nowrap;
  transition: color 0.2s, background 0.2s;
  text-decoration: none;
}

.nav-links a:hover,
.nav-links a:focus-visible {
  color: var(--text);
  background: rgba(255,255,255,0.07);
  text-decoration: none;
}

/* Reading progress bar */
#progress-bar {
  position: fixed;
  top: var(--nav-h);
  left: 0;
  width: 0%;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), var(--cyan));
  z-index: 101;
  transition: width 0.1s linear;
}

/* ---------- HERO ---------- */
#hero {
  padding-block: clamp(4rem, 8vw, 7rem);
  text-align: center;
  position: relative;
  overflow: hidden;
}

#hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 80% 60% at 50% 0%, rgba(16,185,129,0.08), transparent 70%);
  pointer-events: none;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--accent-dim);
  border: 1px solid var(--accent-glow);
  color: var(--accent);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0.35rem 0.85rem;
  border-radius: 999px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 1.5rem;
}

#hero h1 {
  margin-bottom: 1.25rem;
}

#hero h1 .accent { color: var(--accent); }

.hero-summary {
  font-size: clamp(1rem, 2vw, 1.2rem);
  color: var(--muted);
  max-width: 60ch;
  margin-inline: auto;
  margin-bottom: 2.5rem;
}

/* Stat chips */
.stat-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: center;
  margin-bottom: 1.5rem;
}

.stat-chip {
  background: var(--surface);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-sm);
  padding: 1rem 1.5rem;
  text-align: center;
  min-width: 140px;
  transition: border-color 0.3s, box-shadow 0.3s;
}

.stat-chip:hover {
  border-color: var(--accent-glow);
  box-shadow: var(--shadow-glow);
}

.stat-chip .stat-value {
  display: block;
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 800;
  color: var(--accent);
  letter-spacing: -0.03em;
  line-height: 1.1;
}

.stat-chip .stat-label {
  display: block;
  font-size: 0.8rem;
  color: var(--muted);
  margin-top: 0.3rem;
  line-height: 1.3;
}

.hero-disclaimer {
  font-size: 0.78rem;
  color: var(--muted);
  opacity: 0.7;
  max-width: 50ch;
  margin-inline: auto;
}

/* ---------- CARDS ---------- */
.card {
  background: var(--surface);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 1.5rem;
  transition: border-color 0.25s, box-shadow 0.25s;
  box-shadow: var(--shadow-card);
}

.card:hover {
  border-color: rgba(255,255,255,0.15);
}

.card-grid {
  display: grid;
  gap: 1.25rem;
}

@media (min-width: 600px) {
  .card-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 900px) {
  .card-grid.cols-3 { grid-template-columns: repeat(3, 1fr); }
  .card-grid.cols-4 { grid-template-columns: repeat(4, 1fr); }
}

/* ---------- SECTION HEADERS ---------- */
.section-header {
  margin-bottom: 2.5rem;
}

.section-header h2 {
  margin-bottom: 0.5rem;
}

.section-label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.5rem;
}

/* ---------- TABLES ---------- */
.table-wrapper {
  overflow-x: auto;
  border-radius: var(--radius-sm);
  border: 1px solid var(--card-border);
  margin-block: 1.25rem;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

thead {
  background: rgba(255,255,255,0.04);
}

th {
  padding: 0.85rem 1rem;
  text-align: left;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
  border-bottom: 1px solid var(--card-border);
  white-space: nowrap;
}

td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid rgba(255,255,255,0.04);
  color: var(--muted);
  vertical-align: top;
}

tr:last-child td { border-bottom: none; }

tbody tr:hover { background: rgba(255,255,255,0.025); }

td.highlight, th.highlight {
  color: var(--accent);
  font-weight: 600;
}

td.danger { color: var(--danger); }
td.success { color: var(--accent); }
td.warn { color: var(--amber); }

/* ---------- DETAILS/SUMMARY (data tables) ---------- */
details {
  border: 1px solid var(--card-border);
  border-radius: var(--radius-sm);
  margin-top: 1rem;
}

summary {
  padding: 0.6rem 1rem;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--muted);
  cursor: pointer;
  user-select: none;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: color 0.2s;
}

summary::-webkit-details-marker { display: none; }

summary::before {
  content: '▶';
  font-size: 0.65rem;
  transition: transform 0.2s;
  color: var(--accent);
}

details[open] summary::before { transform: rotate(90deg); }

summary:hover { color: var(--text); }

details > *:not(summary) {
  padding: 0 0.5rem 0.5rem;
}

/* ---------- BADGES / TAGS ---------- */
.badge {
  display: inline-flex;
  align-items: center;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  line-height: 1;
}

.badge-accent   { background: var(--accent-dim);  color: var(--accent); }
.badge-cyan     { background: var(--cyan-dim);    color: var(--cyan); }
.badge-amber    { background: var(--amber-dim);   color: var(--amber); }
.badge-danger   { background: var(--danger-dim);  color: var(--danger); }

/* ---------- BUTTONS ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.55rem 1.1rem;
  border-radius: var(--radius-sm);
  font-family: var(--font);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: background 0.2s, box-shadow 0.2s, transform 0.1s;
  white-space: nowrap;
}

.btn:active { transform: scale(0.97); }

.btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.btn-primary {
  background: var(--accent);
  color: #0B1220;
}

.btn-primary:hover { background: #0ea572; box-shadow: var(--shadow-glow); }

.btn-secondary {
  background: rgba(255,255,255,0.07);
  color: var(--text);
  border: 1px solid var(--card-border);
}

.btn-secondary:hover { background: rgba(255,255,255,0.12); }

.btn-ghost {
  background: transparent;
  color: var(--muted);
  padding: 0.4rem 0.7rem;
}

.btn-ghost:hover { color: var(--text); background: rgba(255,255,255,0.06); }

.btn-sm { font-size: 0.8rem; padding: 0.4rem 0.75rem; }

.btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  transform: none;
}

/* ---------- PIPELINE STEPPER ---------- */
#pipeline { background: var(--surface); }

.pipeline-stepper {
  display: flex;
  gap: 0;
  margin-bottom: 2rem;
  overflow-x: auto;
  padding-bottom: 0.5rem;
}

.step-node {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  position: relative;
  cursor: pointer;
  min-width: 120px;
}

.step-node::before {
  content: '';
  position: absolute;
  top: 20px;
  left: 50%;
  width: 100%;
  height: 2px;
  background: var(--card-border);
  z-index: 0;
}

.step-node:last-child::before { display: none; }

.step-node.active .step-icon-wrap { background: var(--accent); border-color: var(--accent); }
.step-node.active .step-icon-wrap svg { stroke: #0B1220; }
.step-node.done .step-icon-wrap { background: var(--accent-dim); border-color: var(--accent); }
.step-node.done::before { background: var(--accent); }

.step-icon-wrap {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  border: 2px solid var(--card-border);
  background: var(--surface2);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1;
  transition: background 0.3s, border-color 0.3s;
  position: relative;
}

.step-icon-wrap svg {
  width: 18px;
  height: 18px;
  stroke: var(--muted);
  fill: none;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
  transition: stroke 0.3s;
}

.step-node.active .step-label { color: var(--accent); }
.step-node.done .step-label { color: var(--text); }

.step-label {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--muted);
  text-align: center;
  margin-top: 0.4rem;
  line-height: 1.3;
  max-width: 100px;
  transition: color 0.3s;
}

.step-num {
  font-size: 0.65rem;
  color: var(--muted);
  margin-top: 0.15rem;
  opacity: 0.6;
}

/* Pipeline controls */
.pipeline-controls {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-bottom: 1.5rem;
}

.stage-indicator {
  font-size: 0.82rem;
  color: var(--muted);
  font-weight: 500;
  margin-left: auto;
}

.stage-indicator strong { color: var(--accent); }

/* Pipeline content panel */
.pipeline-panel {
  background: var(--surface2);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  min-height: 420px;
  padding: 1.5rem;
  position: relative;
  overflow: hidden;
}

.stage-view {
  display: none;
  opacity: 0;
  transition: opacity 0.35s ease;
}

.stage-view.active {
  display: flex;
  opacity: 1;
  gap: 1.5rem;
  flex-wrap: wrap;
}

/* Document mock */
.doc-mock {
  flex: 1;
  min-width: 240px;
  max-width: 340px;
  background: #fff;
  color: #222;
  border-radius: var(--radius-sm);
  padding: 1.25rem;
  font-size: 0.78rem;
  line-height: 1.5;
  font-family: var(--font);
  box-shadow: 0 8px 32px rgba(0,0,0,0.5);
  position: relative;
}

.doc-mock .doc-header {
  border-bottom: 2px solid #1a3a6a;
  padding-bottom: 0.6rem;
  margin-bottom: 0.75rem;
}

.doc-mock .bank-name {
  font-size: 1rem;
  font-weight: 800;
  color: #1a3a6a;
  letter-spacing: -0.02em;
}

.doc-mock .doc-title {
  font-size: 0.75rem;
  color: #555;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-top: 0.15rem;
}

.doc-mock .doc-row {
  display: flex;
  justify-content: space-between;
  padding: 0.2rem 0;
  border-bottom: 1px solid #eee;
}

.doc-mock .doc-row .label { color: #555; }
.doc-mock .doc-row .value { font-weight: 600; color: #111; }

.doc-mock .doc-section {
  margin-top: 0.75rem;
  font-size: 0.72rem;
  color: #777;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.doc-mock .doc-total {
  margin-top: 0.5rem;
  font-size: 0.9rem;
  font-weight: 800;
  color: #1a3a6a;
  text-align: right;
  border-top: 2px solid #1a3a6a;
  padding-top: 0.3rem;
}

.doc-mock .doc-fake-note {
  margin-top: 0.5rem;
  font-size: 0.65rem;
  color: #999;
  font-style: italic;
  text-align: center;
}

/* OCR overlay */
.doc-mock .ocr-highlight {
  background: rgba(16,185,129,0.3);
  border-radius: 2px;
  display: inline;
  transition: background 0.4s;
}

/* Stage info panel */
.stage-info {
  flex: 1;
  min-width: 220px;
}

.stage-info h3 {
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.stage-info h3 .badge { font-size: 0.7rem; }

.stage-info p { font-size: 0.9rem; }

/* JSON output panel */
.json-panel {
  background: #0d1117;
  border: 1px solid var(--card-border);
  border-radius: var(--radius-sm);
  padding: 1rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  line-height: 1.6;
  color: #e6edf7;
  overflow: auto;
  max-height: 220px;
  margin-top: 0.75rem;
  position: relative;
}

.json-key   { color: #79c0ff; }
.json-str   { color: #a5d6ff; }
.json-num   { color: #ffa657; }
.json-bool  { color: #ff7b72; }
.json-new   { background: rgba(16,185,129,0.2); border-radius: 2px; }

/* Validation checklist */
.validation-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-top: 0.75rem;
}

.validation-list li {
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
  font-size: 0.88rem;
  color: var(--muted);
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius-xs);
  background: rgba(255,255,255,0.03);
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 0.3s ease, transform 0.3s ease;
}

.validation-list li.visible {
  opacity: 1;
  transform: translateY(0);
}

.validation-list .check-icon {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  margin-top: 1px;
}

.validation-list li.pass { border-left: 2px solid var(--accent); }
.validation-list li.fail { border-left: 2px solid var(--amber); }
.validation-list li.pass .check-icon { color: var(--accent); }
.validation-list li.fail .check-icon { color: var(--amber); }

/* Final JSON copy button */
.copy-btn {
  position: absolute;
  top: 0.5rem;
  right: 0.5rem;
  background: rgba(255,255,255,0.07);
  border: 1px solid var(--card-border);
  color: var(--muted);
  font-size: 0.75rem;
  font-family: var(--font);
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-xs);
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
}

.copy-btn:hover { background: rgba(255,255,255,0.12); color: var(--text); }
.copy-btn.copied { color: var(--accent); border-color: var(--accent-glow); }

/* Progress indicator for auto-play */
.autoplay-progress {
  display: none;
  height: 3px;
  background: var(--card-border);
  border-radius: 999px;
  margin-bottom: 1rem;
  overflow: hidden;
}

.autoplay-progress.active { display: block; }

.autoplay-progress-inner {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--accent), var(--cyan));
  border-radius: 999px;
  transition: width linear;
}

/* ---------- DOCUMENT TYPES (TABS) ---------- */
#doc-types { background: transparent; }

.tabs-nav {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

.tab-btn {
  background: var(--surface);
  border: 1px solid var(--card-border);
  color: var(--muted);
  font-family: var(--font);
  font-size: 0.875rem;
  font-weight: 600;
  padding: 0.5rem 1.1rem;
  border-radius: 999px;
  cursor: pointer;
  transition: background 0.2s, border-color 0.2s, color 0.2s;
}

.tab-btn:hover {
  color: var(--text);
  border-color: rgba(255,255,255,0.2);
}

.tab-btn.active {
  background: var(--accent-dim);
  border-color: var(--accent-glow);
  color: var(--accent);
}

.tab-btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

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

.doc-type-card {
  background: var(--surface);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 1.75rem;
}

.doc-type-grid {
  display: grid;
  gap: 1.5rem;
}

@media (min-width: 700px) {
  .doc-type-grid { grid-template-columns: 1fr 1fr; }
}

/* Challenges list */
.challenges-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  margin-top: 0.5rem;
}

.challenges-list li {
  font-size: 0.875rem;
  color: var(--muted);
  padding: 0.35rem 0;
  display: flex;
  gap: 0.5rem;
  align-items: flex-start;
}

.challenges-list li::before {
  content: '⚠';
  font-size: 0.75rem;
  color: var(--amber);
  margin-top: 0.15em;
  flex-shrink: 0;
}

.precision-bar {
  height: 8px;
  background: rgba(255,255,255,0.07);
  border-radius: 999px;
  margin-top: 0.75rem;
  overflow: hidden;
}

.precision-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--cyan));
  border-radius: 999px;
  transition: width 1.2s cubic-bezier(0.22, 1, 0.36, 1);
  width: 0%;
}

/* ---------- RESULTS CHARTS ---------- */
#results { background: var(--surface); }

.charts-grid {
  display: grid;
  gap: 1.5rem;
}

@media (min-width: 800px) {
  .charts-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 1200px) {
  .charts-grid { grid-template-columns: repeat(3, 1fr); }
}

.chart-card {
  background: var(--surface2);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 1.5rem;
}

.chart-title {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 0.25rem;
}

.chart-subtitle {
  font-size: 0.78rem;
  color: var(--muted);
  margin-bottom: 1rem;
}

.chart-wrap {
  position: relative;
  height: 220px;
}

/* ---------- TECHNICAL DECISIONS ---------- */
#decisions { background: transparent; }

.decisions-grid {
  display: grid;
  gap: 1.25rem;
}

@media (min-width: 640px) {
  .decisions-grid { grid-template-columns: repeat(2, 1fr); }
}

.decision-card {
  background: var(--surface);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 1.5rem;
  position: relative;
  transition: border-color 0.25s, box-shadow 0.25s;
}

.decision-card:hover {
  border-color: rgba(255,255,255,0.15);
  box-shadow: var(--shadow-card);
}

.decision-icon {
  width: 40px;
  height: 40px;
  background: var(--accent-dim);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 0.85rem;
}

.decision-icon svg {
  width: 20px;
  height: 20px;
  stroke: var(--accent);
  fill: none;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.decision-card h3 {
  font-size: 1rem;
  margin-bottom: 0.4rem;
}

/* Tooltip */
[data-tooltip] { position: relative; }

.tooltip-trigger {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  cursor: help;
  border-bottom: 1px dashed rgba(255,255,255,0.3);
}

.tooltip-bubble {
  position: absolute;
  bottom: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%);
  background: #1e2d4a;
  border: 1px solid var(--card-border);
  color: var(--text);
  font-size: 0.8rem;
  line-height: 1.45;
  padding: 0.55rem 0.8rem;
  border-radius: var(--radius-sm);
  width: max-content;
  max-width: 240px;
  pointer-events: none;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.2s, visibility 0.2s;
  z-index: 50;
  box-shadow: 0 8px 24px rgba(0,0,0,0.4);
}

.tooltip-bubble::after {
  content: '';
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  border: 5px solid transparent;
  border-top-color: #1e2d4a;
}

[data-tooltip]:hover .tooltip-bubble,
[data-tooltip]:focus-within .tooltip-bubble {
  opacity: 1;
  visibility: visible;
}

/* ---------- ARCHITECTURE SVG ---------- */
#architecture { background: var(--surface); }

.arch-container {
  display: grid;
  gap: 1.5rem;
}

@media (min-width: 900px) {
  .arch-container { grid-template-columns: 1fr 360px; }
}

.arch-svg-wrap {
  background: var(--surface2);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 1.5rem;
  overflow-x: auto;
}

.arch-detail {
  background: var(--surface2);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 1.5rem;
}

.arch-detail h3 {
  margin-bottom: 0.5rem;
  font-size: 1rem;
}

.arch-detail .detail-content { display: none; }
.arch-detail .detail-content.active { display: block; }

/* SVG clickable nodes */
.arch-node {
  cursor: pointer;
  outline: none;
}

.arch-node rect,
.arch-node ellipse {
  transition: stroke 0.25s, filter 0.25s;
}

.arch-node:hover rect,
.arch-node:focus-visible rect,
.arch-node.selected rect {
  stroke: var(--accent) !important;
  filter: drop-shadow(0 0 8px rgba(16,185,129,0.5));
}

.arch-node:hover ellipse,
.arch-node:focus-visible ellipse,
.arch-node.selected ellipse {
  stroke: var(--accent) !important;
  filter: drop-shadow(0 0 8px rgba(16,185,129,0.5));
}

/* ---------- AUTHOR SECTION ---------- */
#author {
  background: transparent;
  text-align: center;
}

.author-card {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  background: var(--surface);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 2.5rem 3rem;
  max-width: 500px;
  margin-inline: auto;
}

.author-avatar {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  background: var(--accent-dim);
  border: 2px solid var(--accent-glow);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--accent);
}

.author-name {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--text);
  margin-bottom: 0.15rem;
}

.author-title {
  font-size: 0.9rem;
  color: var(--muted);
  margin-bottom: 0.5rem;
}

.author-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  justify-content: center;
  margin-bottom: 0.5rem;
}

/* ---------- FOOTER ---------- */
footer {
  background: var(--surface);
  border-top: 1px solid var(--card-border);
  padding-block: 2rem;
  text-align: center;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
  justify-content: center;
  margin-bottom: 1rem;
  list-style: none;
}

.footer-links a {
  color: var(--muted);
  font-size: 0.875rem;
  transition: color 0.2s;
}

.footer-links a:hover { color: var(--accent); text-decoration: none; }

.footer-copy {
  font-size: 0.8rem;
  color: var(--muted);
  opacity: 0.6;
}

/* ---------- SCROLL REVEAL ---------- */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }

/* ---------- MISC UTILITIES ---------- */
.text-accent  { color: var(--accent); }
.text-cyan    { color: var(--cyan); }
.text-amber   { color: var(--amber); }
.text-muted   { color: var(--muted); }
.text-sm      { font-size: 0.875rem; }
.text-xs      { font-size: 0.78rem; }

.flex         { display: flex; }
.flex-wrap    { flex-wrap: wrap; }
.items-center { align-items: center; }
.gap-sm       { gap: 0.5rem; }
.gap-md       { gap: 1rem; }
.mt-xs        { margin-top: 0.5rem; }
.mt-sm        { margin-top: 0.75rem; }
.mt-md        { margin-top: 1.25rem; }
.mt-lg        { margin-top: 2rem; }
.mb-sm        { margin-bottom: 0.75rem; }
.mb-md        { margin-bottom: 1.25rem; }

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border-width: 0;
}

/* Typewriter cursor */
.cursor {
  display: inline-block;
  width: 2px;
  height: 1em;
  background: var(--accent);
  vertical-align: text-bottom;
  animation: blink 1s step-end infinite;
}

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

/* Animated counter */
.counter { tabular-nums; font-variant-numeric: tabular-nums; }

/* Proposed arch badge */
.proposed-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: var(--amber-dim);
  border: 1px solid rgba(245,158,11,0.3);
  color: var(--amber);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.3rem 0.7rem;
  border-radius: 999px;
  margin-bottom: 1rem;
}

/* Separator */
.divider {
  height: 1px;
  background: var(--card-border);
  margin-block: 2rem;
}

/* Mobile nav toggle (hidden on desktop) */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--muted);
  cursor: pointer;
  padding: 0.3rem;
}

@media (max-width: 640px) {
  .nav-links {
    display: none;
    position: absolute;
    top: var(--nav-h);
    left: 0;
    right: 0;
    background: var(--surface);
    border-bottom: 1px solid var(--card-border);
    flex-direction: column;
    padding: 0.75rem 1rem;
    gap: 0.2rem;
  }

  .nav-links.open { display: flex; }

  .nav-toggle { display: flex; }

  #site-nav { position: sticky; }

  .pipeline-stepper {
    flex-direction: row;
    overflow-x: auto;
    padding-bottom: 1rem;
  }

  .step-node {
    min-width: 80px;
  }

  .step-label { font-size: 0.65rem; max-width: 75px; }

  .stage-view.active {
    flex-direction: column;
  }

  .doc-mock {
    max-width: 100%;
  }

  .author-card {
    padding: 1.75rem 1.5rem;
  }
}

/* ---- Print friendly ---- */
@media print {
  #site-nav, #progress-bar, .btn, .pipeline-controls { display: none; }
  body { background: #fff; color: #000; }
  .card, .chart-card, .doc-type-card { border: 1px solid #ccc; }
}