/* ============================================================
   ArcReady — Ohm's Law & Circuit Analysis Worksheet Stylesheet
   Module: dev/ohms-worksheet/worksheet.css
   Consumes main.css custom properties & tokens directly.
   ============================================================ */

/* Container & Base Layout */
.worksheet-app {
  max-width: var(--container-width, 1200px);
  margin: 0 auto;
  padding: 20px;
  font-family: var(--font-base, 'Inter', sans-serif);
  color: var(--charcoal, #1A1A1A);
}

.worksheet-header {
  margin-bottom: 24px;
}

.worksheet-title-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  border-bottom: 2px solid var(--gray-mid, #E0E0E0);
  padding-bottom: 16px;
}

.worksheet-title {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--charcoal, #1A1A1A);
  display: flex;
  align-items: center;
  gap: 10px;
}

.worksheet-badge {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 4px 8px;
  border-radius: var(--radius-sm, 4px);
  background: var(--blue-bg, #F0F4FF);
  color: var(--blue, #1565C0);
  border: 1px solid var(--blue-light, #1E88E5);
}

.worksheet-subtitle {
  color: var(--gray-text, #666666);
  font-size: 0.95rem;
  margin-top: 6px;
}

/* Control Toolbar */
.worksheet-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  background: var(--gray-light, #F5F5F5);
  padding: 14px 18px;
  border-radius: var(--radius-md, 8px);
  border: 1px solid var(--gray-mid, #E0E0E0);
  margin-bottom: 24px;
}

.toolbar-group {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
}

.toolbar-label {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--charcoal-mid, #2C2C2C);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.segmented-control {
  display: inline-flex;
  background: var(--white, #FFFFFF);
  border: 1px solid var(--gray-border, #CCCCCC);
  border-radius: var(--radius-sm, 4px);
  overflow: hidden;
  max-width: 100%;
}

.segmented-btn {
  background: transparent;
  border: none;
  padding: 8px 14px;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--charcoal, #1A1A1A);
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
}

.segmented-btn:hover {
  background: var(--gray-light, #F5F5F5);
}

.segmented-btn.active {
  background: var(--blue, #1565C0);
  color: var(--white, #FFFFFF);
}

.select-control {
  padding: 8px 12px;
  border: 1px solid var(--gray-border, #CCCCCC);
  border-radius: var(--radius-sm, 4px);
  font-size: 0.88rem;
  background: var(--white, #FFFFFF);
  color: var(--charcoal, #1A1A1A);
  font-weight: 600;
  cursor: pointer;
}

/* Grid Layout: Schematic (Left) + Interactive Solver (Right) */
.worksheet-main-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  align-items: start;
}

@media (max-width: 960px) {
  .worksheet-main-grid {
    grid-template-columns: 1fr;
  }
}

/* Schematic Panel */
.schematic-card {
  background: var(--white, #FFFFFF);
  border: 1px solid var(--gray-mid, #E0E0E0);
  border-radius: var(--radius-lg, 12px);
  padding: 20px;
  box-shadow: var(--shadow-card);
}

.schematic-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}

.schematic-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--charcoal, #1A1A1A);
}

.schematic-svg-wrap {
  width: 100%;
  background: var(--white, #FFFFFF);
  border: 1px solid var(--gray-border, #CCCCCC);
  border-radius: var(--radius-md, 8px);
  overflow: hidden;
  position: relative;
}

/* SVG Internal Styles — Fully using main.css tokens */
.circuit-schematic-svg {
  width: 100%;
  height: auto;
  display: block;
}

.circuit-schematic-svg .svg-bg {
  fill: var(--white, #FFFFFF);
}

.circuit-schematic-svg .svg-title {
  font-size: 13px;
  font-weight: 700;
  fill: var(--charcoal, #1A1A1A);
  font-family: var(--font-base, sans-serif);
}

.circuit-schematic-svg .svg-wire {
  stroke: var(--charcoal, #1A1A1A);
  stroke-width: 2.5;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.circuit-schematic-svg .svg-bus-hot {
  stroke: var(--red, #CC0000);
}

.circuit-schematic-svg .svg-bus-neu {
  stroke: var(--charcoal, #1A1A1A);
}

.circuit-schematic-svg .svg-polarity-hot {
  fill: var(--red, #CC0000);
  font-size: 14px;
}

.circuit-schematic-svg .svg-polarity-neu {
  fill: var(--charcoal, #1A1A1A);
  font-size: 14px;
}

.circuit-schematic-svg .svg-source-body {
  fill: var(--white, #FFFFFF);
  stroke: var(--charcoal, #1A1A1A);
  stroke-width: 2;
}

.circuit-schematic-svg .svg-source-line {
  stroke: var(--charcoal, #1A1A1A);
  stroke-width: 2;
}

.circuit-schematic-svg .svg-source-text {
  font-size: 11px;
  font-weight: 700;
  fill: var(--blue, #1565C0);
  font-family: var(--font-base, sans-serif);
}

.circuit-schematic-svg .svg-arrow-line,
.circuit-schematic-svg .svg-arrow-head {
  stroke: var(--green, #2E7D32);
  fill: var(--green, #2E7D32);
  stroke-width: 1.5;
}

.circuit-schematic-svg .svg-arrow-text {
  font-size: 10px;
  font-weight: 700;
  fill: var(--green, #2E7D32);
  font-family: var(--font-base, sans-serif);
}

.circuit-schematic-svg .svg-resistor-path {
  fill: none;
  stroke: var(--charcoal, #1A1A1A);
  stroke-width: 2.5;
  stroke-linejoin: round;
  stroke-linecap: round;
  transition: stroke 0.2s ease, stroke-width 0.2s ease;
}

.circuit-schematic-svg .svg-resistor-label {
  font-size: 11px;
  font-weight: 700;
  fill: var(--charcoal, #1A1A1A);
  font-family: var(--font-base, sans-serif);
}

.circuit-schematic-svg .svg-resistor-sub {
  font-size: 10px;
  fill: var(--gray-text, #666666);
  font-family: var(--font-base, sans-serif);
}

.circuit-schematic-svg .svg-node-dot {
  fill: var(--amber, #F57C00);
  stroke: var(--charcoal, #1A1A1A);
  stroke-width: 1.5;
}

.circuit-schematic-svg .svg-node-label {
  font-size: 10px;
  font-weight: 700;
  fill: var(--amber, #F57C00);
  font-family: var(--font-base, sans-serif);
}

.circuit-schematic-svg .svg-bank-box {
  fill: var(--blue-bg, #F0F4FF);
  stroke: var(--blue-light, #1E88E5);
  stroke-width: 1.5;
  stroke-dasharray: 6,4;
}

.circuit-schematic-svg .svg-bank-label {
  font-size: 10px;
  font-style: italic;
  fill: var(--blue, #1565C0);
  font-family: var(--font-base, sans-serif);
}

.circuit-schematic-svg .svg-resistor-hitbox {
  fill: transparent;
  cursor: pointer;
}

/* Hover & Focus Pulses on SVG Resistors */
.circuit-schematic-svg .svg-resistor-group:hover .svg-resistor-path,
.circuit-schematic-svg .svg-resistor-group.is-active .svg-resistor-path {
  stroke: var(--amber, #F57C00);
  stroke-width: 4;
}

.circuit-schematic-svg .svg-resistor-group:hover .svg-resistor-label,
.circuit-schematic-svg .svg-resistor-group.is-active .svg-resistor-label {
  fill: var(--amber, #F57C00);
}

/* Solver / Worksheet Container */
.solver-card {
  background: var(--white, #FFFFFF);
  border: 1px solid var(--gray-mid, #E0E0E0);
  border-radius: var(--radius-lg, 12px);
  padding: 20px;
  box-shadow: var(--shadow-card);
}

.solver-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 16px;
}

.solver-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--charcoal, #1A1A1A);
}

/* Mode Switch Tabs */
.mode-switch-nav {
  display: flex;
  gap: 8px;
  border-bottom: 2px solid var(--gray-mid, #E0E0E0);
  margin-bottom: 18px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.mode-tab-btn {
  background: none;
  border: none;
  border-bottom: 3px solid transparent;
  padding: 8px 16px;
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--gray-text, #666666);
  cursor: pointer;
  transition: var(--transition);
  margin-bottom: -2px;
  white-space: nowrap;
}

.mode-tab-btn:hover {
  color: var(--charcoal, #1A1A1A);
}

.mode-tab-btn.active {
  color: var(--blue, #1565C0);
  border-bottom-color: var(--blue, #1565C0);
}

/* VIRP Table Matrix Styling */
.virp-table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin-top: 14px;
  border: 1px solid var(--gray-mid, #E0E0E0);
  border-radius: var(--radius-sm, 4px);
}

.desktop-hdr,
.desktop-label {
  display: inline;
}

.mobile-hdr,
.mobile-label {
  display: none;
}

.virp-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

.virp-table th {
  background: var(--gray-light, #F5F5F5);
  color: var(--charcoal-mid, #2C2C2C);
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 10px 12px;
  border: 1px solid var(--gray-mid, #E0E0E0);
}

.virp-table td {
  padding: 8px 10px;
  border: 1px solid var(--gray-mid, #E0E0E0);
  vertical-align: middle;
}

.virp-table tr.row-total {
  background: var(--blue-bg, #F0F4FF);
  font-weight: 700;
}

.virp-cell-input {
  width: 100%;
  min-width: 60px;
  padding: 8px 10px;
  font-family: var(--font-mono, monospace);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--charcoal, #1A1A1A);
  background: var(--white, #FFFFFF);
  border: 1.5px solid var(--gray-border, #CCCCCC);
  border-radius: var(--radius-sm, 4px);
  outline: none;
  transition: var(--transition);
  text-align: center;
  box-sizing: border-box;
}

.virp-cell-input:focus {
  border-color: var(--blue, #1565C0);
  box-shadow: 0 0 0 3px rgba(21, 101, 192, 0.15);
}

.virp-cell-given {
  display: inline-block;
  padding: 6px 10px;
  background: var(--gray-light, #F5F5F5);
  border: 1px solid var(--gray-border, #CCCCCC);
  border-radius: var(--radius-sm, 4px);
  font-family: var(--font-mono, monospace);
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--charcoal-mid, #2C2C2C);
  text-align: center;
  box-sizing: border-box;
}

.virp-cell-input.cell-correct {
  border-color: var(--green, #2E7D32);
  background: var(--green-bg, #F1F8E9);
  color: var(--green, #2E7D32);
}

.virp-cell-input.cell-incorrect {
  border-color: var(--red, #CC0000);
  background: var(--red-bg, #FFF5F5);
  color: var(--red, #CC0000);
}

/* Action Controls & Score Bar */
.solver-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px solid var(--gray-mid, #E0E0E0);
}

.worksheet-app .btn-group {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.worksheet-app .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 18px;
  font-size: 0.92rem;
  font-weight: 700;
  border-radius: var(--radius-btn, 4px);
  border: 1px solid transparent;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
  min-height: 44px;
}

.worksheet-app .btn-primary {
  background: var(--red, #CC0000);
  color: var(--white, #FFFFFF);
}

.worksheet-app .btn-primary:hover {
  background: var(--red-dark, #A00000);
}

.worksheet-app .btn-secondary {
  background: var(--charcoal, #1A1A1A);
  color: var(--white, #FFFFFF);
}

.worksheet-app .btn-secondary:hover {
  background: var(--charcoal-mid, #2C2C2C);
}

.worksheet-app .btn-outline {
  background: var(--white, #FFFFFF);
  border-color: var(--gray-border, #CCCCCC);
  color: var(--charcoal, #1A1A1A);
}

.worksheet-app .btn-outline:hover {
  background: var(--gray-light, #F5F5F5);
  border-color: var(--charcoal, #1A1A1A);
}

.worksheet-app .btn-blue {
  background: var(--blue, #1565C0);
  color: var(--white, #FFFFFF);
}

.worksheet-app .btn-blue:hover {
  background: var(--blue-dark, #0D47A1);
}

/* Feedback & Solution Panels */
.feedback-banner {
  padding: 12px 16px;
  border-radius: var(--radius-md, 8px);
  margin-top: 16px;
  font-size: 0.92rem;
  font-weight: 600;
  display: none;
}

.feedback-banner.success {
  display: flex;
  align-items: center;
  background: var(--green-bg, #F1F8E9);
  border: 1px solid var(--green, #2E7D32);
  color: var(--green, #2E7D32);
}

.feedback-banner.partial {
  display: flex;
  align-items: center;
  background: var(--amber-bg, #FFF8E1);
  border: 1px solid var(--amber, #F57C00);
  color: var(--amber, #F57C00);
}

.feedback-banner.error {
  display: flex;
  align-items: center;
  background: var(--red-bg, #FFF5F5);
  border: 1px solid var(--red, #CC0000);
  color: var(--red, #CC0000);
}

.solution-panel {
  background: var(--gray-light, #F5F5F5);
  border: 1px solid var(--gray-mid, #E0E0E0);
  border-radius: var(--radius-md, 8px);
  padding: 16px;
  margin-top: 18px;
  display: none;
}

.solution-panel.open {
  display: block;
}

.solution-panel h4 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--charcoal, #1A1A1A);
  margin-bottom: 12px;
}

.solution-step {
  margin-bottom: 10px;
  font-size: 0.88rem;
  line-height: 1.5;
  color: var(--charcoal-mid, #2C2C2C);
}

.solution-step strong {
  color: var(--blue, #1565C0);
}

/* Guided Mode Step Flow */
.guided-step-card {
  border: 1px solid var(--gray-mid, #E0E0E0);
  border-radius: var(--radius-md, 8px);
  padding: 16px;
  margin-bottom: 14px;
  background: var(--white, #FFFFFF);
  transition: var(--transition);
}

.guided-step-card.active-step {
  border-color: var(--blue, #1565C0);
  box-shadow: 0 0 0 2px rgba(21, 101, 192, 0.15);
}

.guided-step-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--charcoal, #1A1A1A);
  margin-bottom: 6px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.guided-step-input-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 10px;
  flex-wrap: wrap;
}

/* Custom Sandbox Input Bar */
.sandbox-controls {
  background: var(--blue-bg, #F0F4FF);
  border: 1px solid var(--blue-light, #1E88E5);
  border-radius: var(--radius-md, 8px);
  padding: 16px;
  margin-bottom: 18px;
}

.sandbox-form {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  gap: 12px;
}

.sandbox-field {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.sandbox-field label {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--charcoal-mid, #2C2C2C);
}

.sandbox-field input {
  padding: 8px 10px;
  border: 1.5px solid var(--gray-border, #CCCCCC);
  border-radius: var(--radius-sm, 4px);
  font-family: var(--font-mono, monospace);
  font-size: 16px;
  font-weight: 600;
  width: 110px;
  min-height: 44px;
}

/* ============================================================
   RESPONSIVE MOBILE VIEWPORT RULES (<= 768px & <= 480px)
   ============================================================ */
@media (max-width: 768px) {
  .worksheet-app {
    padding: 12px 8px;
  }

  .worksheet-title {
    font-size: 1.35rem;
  }

  .worksheet-title-row {
    flex-direction: column;
    align-items: stretch;
    gap: 12px;
  }

  .worksheet-toolbar {
    flex-direction: column;
    align-items: stretch;
    padding: 12px;
    gap: 12px;
  }

  .toolbar-group {
    width: 100%;
    flex-direction: column;
    align-items: stretch;
    gap: 6px;
  }

  .segmented-control {
    width: 100%;
    display: flex;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  .segmented-btn {
    flex: 1 0 auto;
    text-align: center;
    padding: 10px 8px;
    font-size: 0.82rem;
    min-height: 44px;
  }

  .select-control {
    width: 100%;
    min-height: 44px;
  }

  .schematic-card,
  .solver-card {
    padding: 12px 8px;
  }

  /* VIRP Matrix Full Responsive Grid (Zero Clipping) */
  .desktop-hdr,
  .desktop-label {
    display: none !important;
  }

  .mobile-hdr,
  .mobile-label {
    display: inline !important;
  }

  .virp-table-wrap {
    overflow-x: visible !important;
    width: 100% !important;
    margin: 10px 0 14px 0 !important;
    border: none !important;
  }

  .virp-table {
    width: 100% !important;
    min-width: 0 !important;
    table-layout: fixed !important;
    border-collapse: separate !important;
    border-spacing: 2px !important;
  }

  .virp-table th {
    padding: 6px 1px !important;
    font-size: 0.72rem !important;
    text-align: center !important;
    border: 1px solid var(--gray-mid, #E0E0E0) !important;
    border-radius: 3px !important;
  }

  .virp-table th.col-comp {
    width: 18% !important;
    text-align: left !important;
    padding-left: 4px !important;
  }

  .virp-table th.col-v,
  .virp-table th.col-i,
  .virp-table th.col-r,
  .virp-table th.col-p {
    width: 20.5% !important;
  }

  .virp-table td {
    padding: 2px 1px !important;
    text-align: center !important;
    border: none !important;
    vertical-align: middle !important;
  }

  .virp-table td.col-comp {
    text-align: left !important;
    padding-left: 4px !important;
    font-size: 0.85rem !important;
  }

  .virp-cell-input {
    font-size: 15px !important;
    min-width: 0 !important;
    width: 100% !important;
    min-height: 42px !important;
    padding: 6px 2px !important;
    text-align: center !important;
    box-sizing: border-box !important;
    border-radius: 4px !important;
    border: 1.5px solid var(--gray-border, #CCCCCC) !important;
  }

  .virp-cell-given {
    display: flex !important;
    align-items: center !important;
    justify-content: center !important;
    min-height: 42px !important;
    padding: 4px 2px !important;
    font-size: 0.80rem !important;
    width: 100% !important;
    box-sizing: border-box !important;
    text-align: center !important;
    border-radius: 4px !important;
  }

  .solver-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .worksheet-app .btn-group {
    width: 100%;
    flex-direction: column;
  }

  .worksheet-app .btn {
    width: 100%;
  }
}

/* ============================================================
   PRINT ENGINE STYLES (@media print)
   ============================================================ */
@media print {
  body {
    background: #FFFFFF !important;
    color: #000000 !important;
    font-size: 11pt !important;
  }

  .top-nav,
  .worksheet-toolbar,
  .mode-switch-nav,
  .solver-actions,
  .worksheet-app .btn,
  .solution-panel,
  .feedback-banner {
    display: none !important;
  }

  .worksheet-app {
    max-width: 100% !important;
    padding: 0 !important;
    margin: 0 !important;
  }

  .worksheet-main-grid {
    display: block !important;
  }

  .schematic-card,
  .solver-card {
    border: none !important;
    box-shadow: none !important;
    padding: 0 !important;
    margin-bottom: 20pt !important;
  }

  .print-header-block {
    display: flex !important;
    justify-content: space-between;
    border-bottom: 2pt solid #000000;
    padding-bottom: 10pt;
    margin-bottom: 15pt;
  }

  .print-header-title {
    font-size: 16pt;
    font-weight: bold;
  }

  .print-student-info {
    font-size: 11pt;
    display: flex;
    gap: 30pt;
  }

  .print-workspace-box {
    display: block !important;
    border: 1pt dashed #666666;
    height: 120pt;
    margin-top: 15pt;
    padding: 8pt;
    color: #888888;
    font-size: 9pt;
  }

  .virp-table th {
    background: #EEEEEE !important;
    color: #000000 !important;
    border: 1pt solid #000000 !important;
  }

  .virp-table td {
    border: 1pt solid #000000 !important;
  }

  .virp-cell-input {
    border: none !important;
    background: transparent !important;
  }

  .page-break {
    page-break-before: always;
  }
}

.print-header-block,
.print-workspace-box {
  display: none;
}