/* ============================================================
   exp10_alu.css (Adapted from exp8_mux_demux.css)
   ============================================================ */

:root {
  --bg: #eceeff;
  --surface: rgba(255,255,255,0.65);
  --border: rgba(255,255,255,0.4);
  --border-dark: rgba(0,0,0,0.08);
  --border-radius: 14px;
  --panel-radius: 12px;
  --text: #0f0f1a;
  --muted: #475569;
  --cyan: #06b6d4;
  --green: #10b981;
  --rose: #f43f5e;
  --blue: #1a56db;
  --purple: #7c3aed;
  --font-body: -apple-system, 'SF Pro Display', sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, monospace;
}

body {
  margin: 0;
  background-color: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
}

.page {
  /* Fix navbar overlapping content */
  padding-top: var(--lf-main-padding-top, 120px);
  max-width: 1440px;
  margin: 0 auto;
  padding-left: 2rem;
  padding-right: 2rem;
  padding-bottom: 4rem;
  position: relative;
  z-index: 10;
}

/* Page Header */
.page-header {
  margin-bottom: 2rem;
}
.breadcrumb {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--muted);
  font-weight: 600;
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.badge {
  background: rgba(124, 58, 237, 0.15);
  color: var(--purple);
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  border: 1px solid rgba(124, 58, 237, 0.3);
  font-weight: 700;
}
.page-header h1 {
  font-family: 'Playfair Display', serif;
  font-size: 2.2rem;
  color: var(--text);
  margin-bottom: 0.5rem;
  letter-spacing: -0.02em;
}

.page-header p {
  font-size: 0.95rem;
  color: var(--muted);
  max-width: 700px;
  line-height: 1.6;
}

/* Zone Architecture */
.zones-container {
  display: grid;
  grid-template-columns: 240px 1fr 340px;
  gap: 1.5rem;
  align-items: start;
}

/* Glass Panels */
.glass-card {
  background: var(--surface);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border);
  border-radius: var(--border-radius);
  padding: 1.5rem;
  box-shadow: 0 8px 32px rgba(15, 15, 26, 0.06);
}

.card-label {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-weight: 700;
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.card-label::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border-dark);
}

/* Zone 1: Navigation */
.lab-nav {
  list-style: none;
  padding: 0;
  margin: 0;
}
.lab-nav li {
  margin-bottom: 0.4rem;
}
.lab-nav a {
  display: block;
  padding: 0.6rem 0.8rem;
  color: var(--muted);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.9rem;
  border-radius: 8px;
  transition: all 0.2s;
  cursor: pointer;
}
.lab-nav a:hover, .lab-nav a.active {
  background: rgba(124, 58, 237, 0.1);
  color: var(--purple);
}
.controls-divider {
  height: 1px;
  background: var(--border-dark);
  margin: 1.5rem 0;
}

/* Toggles & Buttons */
.mode-toggle-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
}
.mode-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
}
.switch {
  position: relative;
  display: inline-block;
  width: 44px;
  height: 24px;
}
.switch input { display: none; }
.slider.round {
  position: absolute;
  cursor: pointer;
  top: 0; left: 0; right: 0; bottom: 0;
  background-color: var(--blue);
  transition: .4s;
  border-radius: 24px;
}
.slider.round:before {
  position: absolute;
  content: "";
  height: 18px;
  width: 18px;
  left: 3px;
  bottom: 3px;
  background-color: white;
  transition: .4s;
  border-radius: 50%;
}
input:checked + .slider {
  background-color: var(--purple);
}
input:checked + .slider:before {
  transform: translateX(20px);
}

.btn-group-vertical {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}
.btn {
  padding: 0.75rem;
  border-radius: 8px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  cursor: pointer;
  border: none;
  transition: 0.2s;
  text-align: center;
}
.btn-outline {
  background: transparent;
  border: 1px solid var(--muted);
  color: var(--muted);
}
.btn-outline:hover {
  background: rgba(0,0,0,0.05);
  color: var(--text);
}
.btn-primary {
  background: var(--blue);
  color: white;
}
.btn-primary:hover {
  background: #113f9c;
}
.btn-green {
  background: var(--green);
  color: white;
}
.btn-green:hover {
  background: #0d9668;
}
.full-w { width: 100%; margin-top: 1rem; }

/* Zone 2: Simulator and other center tabs */
.zone-2 {
  display: flex;
  flex-direction: column;
  min-height: 500px;
}

.core-tab-panel {
  display: none;
}
.core-tab-panel.active {
  display: block;
}
#tab-simulation.active {
  display: flex;
  flex-direction: column;
}

.sim-heading {
  margin-bottom: 0;
  justify-content: space-between;
}
.sim-status {
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  background: rgba(16, 185, 129, 0.1);
  color: var(--green);
}
.simulator-canvas {
  flex: 1;
  border: 1px dashed var(--border-dark);
  border-radius: var(--panel-radius);
  background: rgba(255,255,255,0.7);
  margin-top: 1rem;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

/* SVG ALU Styling */
.trace {
  fill: none;
  stroke: #cbd5e1;
  stroke-width: 3;
  stroke-linejoin: round;
  stroke-dasharray: 400;
  stroke-dashoffset: 400;
  transition: stroke 0.3s, opacity 0.3s, filter 0.3s, stroke-dashoffset 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.bit-trace {
  stroke-width: 2.5;
  stroke-dasharray: 400;
  stroke-dashoffset: 400;
  transition: stroke 0.3s, filter 0.3s, stroke-dashoffset 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.trace-active {
  stroke: var(--cyan);
  filter: drop-shadow(0 0 6px var(--cyan));
  stroke-dashoffset: 0;
}

.trace-active-a {
  stroke: var(--green);
  filter: drop-shadow(0 0 4px var(--green));
  stroke-dashoffset: 0;
}

.trace-active-b {
  stroke: var(--rose);
  filter: drop-shadow(0 0 4px var(--rose));
  stroke-dashoffset: 0;
}

.trace-active-s {
  stroke: var(--blue);
  filter: drop-shadow(0 0 4px var(--blue));
  stroke-dashoffset: 0;
}

.trace-dimmed {
  stroke: #cbd5e1;
  opacity: 0.4;
}

.bit-trace.trace-dimmed {
  stroke-dashoffset: 400;
  opacity: 0.2;
}

.svg-block {
  fill: rgba(255, 255, 255, 0.8);
  stroke: rgba(15, 15, 26, 0.15);
  stroke-width: 2;
}

.svg-text {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  fill: var(--text);
  text-anchor: middle;
}

/* IO Panel */
.io-panel {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-top: 1rem;
  background: rgba(255,255,255,0.8);
  padding: 1rem;
  border-radius: var(--panel-radius);
  border: 1px solid var(--border-dark);
}

.io-row {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
}

.io-group {
  display: flex;
  gap: 0.5rem;
  align-items: center;
}
.io-switch {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.4rem;
}
.io-switch span {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--muted);
}
.toggle-btn {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  border: 2px solid var(--border-dark);
  background: #e2e8f0;
  color: var(--text);
  font-family: var(--font-mono);
  font-weight: bold;
  font-size: 0.9rem;
  cursor: pointer;
  transition: all 0.2s;
}

.toggle-btn.on.btn-a { background: var(--green); color: white; border-color: var(--green); box-shadow: 0 4px 12px rgba(16, 185, 129, 0.3); }
.toggle-btn.on.btn-b { background: var(--rose); color: white; border-color: var(--rose); box-shadow: 0 4px 12px rgba(244, 63, 94, 0.3); }
.toggle-btn.on.btn-s { background: var(--blue); color: white; border-color: var(--blue); box-shadow: 0 4px 12px rgba(26, 86, 219, 0.3); }
.toggle-btn.on.btn-m { background: var(--cyan); color: white; border-color: var(--cyan); box-shadow: 0 4px 12px rgba(6, 182, 212, 0.3); }

.output-ind {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: #e2e8f0;
  border: 2px solid var(--border-dark);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-weight: bold;
  color: var(--text);
  transition: background 0.3s, box-shadow 0.3s, color 0.3s;
}
.output-ind.on {
  background: var(--text);
  color: white;
  border-color: var(--text);
  box-shadow: 0 0 15px rgba(15, 15, 26, 0.6);
}

/* Zone 3: Theory & Table */
.mb-4 { margin-bottom: 1rem; }
.theory-text {
  font-size: 0.9rem;
  line-height: 1.5;
  color: var(--text);
}

.table-scroll {
  max-height: 320px;
  overflow-y: auto;
  border: 1px solid var(--border-dark);
  border-radius: 8px;
  background: rgba(255,255,255,0.6);
}
.truth-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-align: center;
}
.truth-table th {
  background: rgba(0,0,0,0.05);
  padding: 0.5rem;
  border-bottom: 1px solid var(--border-dark);
  color: var(--muted);
}
.truth-table td {
  padding: 0.5rem;
  border-bottom: 1px solid rgba(0,0,0,0.05);
}
.truth-table tr:last-child td { border-bottom: none; }
.row-active {
  background: rgba(124, 58, 237, 0.15); /* Purple highlight for ALU */
  font-weight: bold;
}

/* Reading content styles for Aim, Theory etc. */
.read-content h2 { margin-top: 0; color: var(--text); }
.read-content h3 { color: var(--text); }
.read-content p { line-height: 1.6; color: var(--muted); margin-bottom: 1rem; }
.read-content ul, .read-content ol { line-height: 1.6; color: var(--muted); padding-left: 1.5rem; }
.read-content li { margin-bottom: 0.5rem; }

/* Print View Formatting */
#printReport {
  display: none;
}
@media print {
  @page { margin: 2cm; }
  body * { visibility: hidden; }
  body { background: white !important; }
  .bg-mesh, .site-nav, .cursor-glow { display: none !important; }

  #printReport, #printReport * {
    visibility: visible;
  }
  #printReport {
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    color: black;
    font-family: -apple-system, sans-serif;
  }
  
  .print-header {
    border-bottom: 2px solid #7c3aed;
    padding-bottom: 1rem;
    margin-bottom: 2rem;
  }
  .print-title {
    color: #7c3aed;
    font-size: 24pt;
    margin: 0 0 1rem 0;
  }
  .print-meta p { margin: 0.25rem 0; font-size: 12pt; }
  
  .print-section-title {
    font-size: 16pt;
    margin: 2rem 0 1rem;
  }
  
  .print-table {
    width: 100%;
    border-collapse: collapse;
    font-family: monospace;
    font-size: 10pt;
    margin-bottom: 2rem;
  }
  .print-table th {
    border-bottom: 1px solid #ccc;
    padding: 8px;
    text-align: left;
    color: #555;
  }
  .print-table td {
    padding: 8px;
    border-bottom: 1px solid #eee;
  }

  .print-conclusion {
    font-size: 11pt;
    line-height: 1.5;
    margin-bottom: 3rem;
  }

  .print-signatures {
    display: flex;
    justify-content: space-between;
    margin-top: 5rem;
  }
  .sig-box { width: 40%; }
  .sig-line {
    display: block;
    border-bottom: 1px solid black;
    margin-bottom: 10px;
    height: 1px;
  }
}