/* ============================================================
   Ray Optics Simulator – Tool-specific styles
   Two-column: main content | ads rail
   ============================================================ */

:root {
  --rs-primary: #0ea5e9;
  --rs-primary-dark: #0284c7;
  --rs-gradient: linear-gradient(135deg, #0ea5e9 0%, #6366f1 100%);
  --rs-glass: rgba(14,165,233,0.12);
  --rs-light: #f0f9ff;
}

/* ---- layout ---- */
.rs-layout {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 1.5rem;
  max-width: 1600px;
  margin: 0 auto;
  padding: 1.5rem;
  min-height: calc(100vh - 180px);
}

/* ---- main column ---- */
.rs-main { min-width: 0; }

/* ---- ads column (match site-wide tool-ads-column) ---- */
.rs-ads-col {
  height: fit-content;
  min-height: 280px;
  align-self: start;
  position: sticky;
  top: 70px;
}
/* Override ads.css ::before aspect-ratio trick inside sticky sidebar —
   the padding-bottom placeholder can cause collapse in fit-content containers */
.rs-ads-col .ad-in-content-mid::before {
  display: none;
}
.rs-ads-col .ad-in-content-mid {
  min-height: 280px;
  max-width: 300px;
  margin: 0;
}

/* ---- canvas card ---- */
.rs-canvas-card {
  background: var(--bg-primary, #fff);
  border: 1px solid var(--border, #e2e8f0);
  border-radius: 8px;
  overflow: hidden;
}

.rs-toolbar {
  display: flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.375rem 0.5rem;
  border-bottom: 1px solid var(--border, #e2e8f0);
  flex-wrap: wrap;
  background: var(--bg-secondary, #f8fafc);
}

.rs-toolbar-sep {
  width: 1px;
  height: 20px;
  background: var(--border, #e2e8f0);
  margin: 0 0.125rem;
}

.rs-select {
  font-size: 0.6875rem;
  padding: 0.25rem 0.375rem;
  border: 1px solid var(--border, #e2e8f0);
  border-radius: 4px;
  background: var(--bg-primary, #fff);
  color: var(--text-primary, #1f2937);
  cursor: pointer;
  max-width: 160px;
}

.rs-btn {
  font-size: 0.625rem;
  padding: 0.25rem 0.5rem;
  border: 1px solid var(--border, #e2e8f0);
  border-radius: 4px;
  background: var(--bg-primary, #fff);
  color: var(--text-primary, #1f2937);
  cursor: pointer;
  white-space: nowrap;
  transition: background 0.15s, border-color 0.15s;
}
.rs-btn:hover { background: var(--bg-secondary, #f1f5f9); border-color: var(--rs-primary); }
.rs-btn-danger { color: #dc2626; }
.rs-btn-danger:hover { background: #fef2f2; border-color: #dc2626; }
.rs-btn-active {
  background: var(--rs-primary);
  color: #fff;
  border-color: var(--rs-primary);
}
.rs-btn-active:hover { background: var(--rs-primary-dark); }

.rs-label {
  font-size: 0.625rem;
  color: var(--text-secondary, #6b7280);
  white-space: nowrap;
}

/* ---- canvas ---- */
.rs-canvas-wrap {
  position: relative;
  width: 100%;
  aspect-ratio: 4 / 3;
  min-height: 400px;
  background: #1a1a2e;
  cursor: crosshair;
}
.rs-canvas-wrap canvas {
  display: block;
  width: 100%;
  height: 100%;
}

/* ---- object bar (appears when selected) ---- */
.rs-objbar {
  display: flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.375rem 0.5rem;
  border-top: 1px solid var(--border, #e2e8f0);
  background: var(--bg-secondary, #f8fafc);
  flex-wrap: wrap;
  min-height: 36px;
}
.rs-objbar-empty {
  font-size: 0.6875rem;
  color: var(--text-secondary, #94a3b8);
  font-style: italic;
}
.rs-objbar-title {
  font-size: 0.6875rem;
  font-weight: 600;
  color: var(--rs-primary);
  margin-right: 0.25rem;
}
.rs-prop-group {
  display: flex;
  align-items: center;
  gap: 0.2rem;
}
.rs-prop-lbl {
  font-size: 0.5625rem;
  color: var(--text-secondary, #6b7280);
  text-transform: lowercase;
}
.rs-prop-inp {
  font-size: 0.625rem;
  width: 52px;
  padding: 0.15rem 0.25rem;
  border: 1px solid var(--border, #e2e8f0);
  border-radius: 3px;
  background: var(--bg-primary, #fff);
  color: var(--text-primary, #1f2937);
  text-align: right;
}
.rs-prop-inp:focus {
  outline: none;
  border-color: var(--rs-primary);
  box-shadow: 0 0 0 2px rgba(14,165,233,0.15);
}

/* ---- controls row (below canvas) ---- */
.rs-controls {
  display: flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.375rem 0.5rem;
  border-top: 1px solid var(--border, #e2e8f0);
  background: var(--bg-secondary, #f8fafc);
  flex-wrap: wrap;
}

.rs-toggle {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  font-size: 0.625rem;
  color: var(--text-secondary, #6b7280);
  cursor: pointer;
}
.rs-toggle input[type="checkbox"] {
  width: 13px;
  height: 13px;
  accent-color: var(--rs-primary);
  cursor: pointer;
}

/* ---- educational cards ---- */
.rs-edu-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 0.75rem;
}
.rs-edu-card {
  padding: 0.75rem;
  border: 1px solid var(--border, #e2e8f0);
  border-radius: 6px;
  background: var(--bg-primary, #fff);
}
.rs-edu-card h4 {
  font-size: 0.8125rem;
  font-weight: 600;
  margin: 0 0 0.375rem;
  color: var(--text-primary, #1f2937);
}
.rs-edu-card p {
  font-size: 0.75rem;
  line-height: 1.5;
  color: var(--text-secondary, #475569);
  margin: 0;
}

/* ---- FAQ ---- */
.rs-faq-item {
  border-bottom: 1px solid var(--border, #e2e8f0);
}
.rs-faq-item:last-child { border-bottom: none; }
.rs-faq-q {
  font-size: 0.8125rem;
  font-weight: 500;
  padding: 0.625rem 0;
  cursor: pointer;
  color: var(--text-primary, #1f2937);
}
.rs-faq-a {
  font-size: 0.75rem;
  line-height: 1.6;
  color: var(--text-secondary, #475569);
  padding: 0 0 0.625rem;
  margin: 0;
}

/* ---- tool card (reuse site pattern) ---- */
.rs-card {
  background: var(--bg-primary, #fff);
  border: 1px solid var(--border, #e2e8f0);
  border-radius: 8px;
  margin-top: 0.75rem;
}
.rs-card-header {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.5rem 0.75rem;
  border-bottom: 1px solid var(--border, #e2e8f0);
  color: var(--text-primary, #1f2937);
}
.rs-card-body {
  padding: 0.75rem;
}

/* ---- responsive ---- */
@media (max-width: 768px) {
  .rs-layout {
    grid-template-columns: 1fr;
  }
  .rs-ads-col { display: none; }
}

@media (max-width: 640px) {
  .rs-layout { padding: 0 0.75rem 1.5rem; }
  .rs-canvas-wrap { min-height: 300px; aspect-ratio: 3 / 2; }
  .rs-toolbar { gap: 0.25rem; }
  .rs-select { max-width: 120px; font-size: 0.625rem; }
}

/* ---- dark mode ---- */
[data-theme="dark"] .rs-canvas-card {
  background: var(--bg-primary, #1e1e2e);
  border-color: var(--border, #2d2d3f);
}
[data-theme="dark"] .rs-toolbar,
[data-theme="dark"] .rs-objbar,
[data-theme="dark"] .rs-controls {
  background: var(--bg-secondary, #16161a);
  border-color: var(--border, #2d2d3f);
}
[data-theme="dark"] .rs-btn { background: var(--bg-secondary, #16161a); }
[data-theme="dark"] .rs-btn:hover { background: var(--bg-primary, #1e1e2e); }
[data-theme="dark"] .rs-prop-inp {
  background: var(--bg-primary, #1e1e2e);
  border-color: var(--border, #2d2d3f);
}
[data-theme="dark"] .rs-card {
  background: var(--bg-primary, #1e1e2e);
  border-color: var(--border, #2d2d3f);
}
[data-theme="dark"] .rs-edu-card {
  background: var(--bg-secondary, #16161a);
  border-color: var(--border, #2d2d3f);
}

/* ---- context menu ---- */
.rs-ctx-menu {
  position: absolute;
  z-index: 100;
  min-width: 160px;
  background: var(--bg-primary, #fff);
  border: 1px solid var(--border, #e2e8f0);
  border-radius: 6px;
  box-shadow: 0 4px 16px rgba(0,0,0,0.15);
  padding: 0.25rem 0;
  font-size: 0.6875rem;
}
.rs-ctx-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 0.375rem 0.75rem;
  border: none;
  background: none;
  color: var(--text-primary, #1f2937);
  cursor: pointer;
  font-size: 0.6875rem;
  text-align: left;
}
.rs-ctx-item:hover {
  background: var(--rs-glass, rgba(14,165,233,0.12));
}
.rs-ctx-danger { color: #dc2626; }
.rs-ctx-danger:hover { background: #fef2f2; }
.rs-ctx-key {
  font-size: 0.5625rem;
  color: var(--text-secondary, #94a3b8);
  margin-left: 1rem;
}
.rs-ctx-sep {
  border: none;
  border-top: 1px solid var(--border, #e2e8f0);
  margin: 0.2rem 0;
}
[data-theme="dark"] .rs-ctx-menu {
  background: var(--bg-secondary, #16161a);
  border-color: var(--border, #2d2d3f);
  box-shadow: 0 4px 16px rgba(0,0,0,0.4);
}
[data-theme="dark"] .rs-ctx-item:hover {
  background: rgba(14,165,233,0.15);
}
[data-theme="dark"] .rs-ctx-danger:hover { background: rgba(220,38,38,0.15); }

/* ---- undo/redo buttons ---- */
.rs-btn[disabled] {
  opacity: 0.35;
  cursor: not-allowed;
}

/* ---- accent button ---- */
.rs-btn-accent {
  background: linear-gradient(135deg, #6366f1, #8b5cf6) !important;
  color: #fff !important;
  border-color: transparent !important;
}
.rs-btn-accent:hover { filter: brightness(1.1); }

/* ═══════════════════════════════════════
   LENS PRESCRIPTION MODAL
   ═══════════════════════════════════════ */
.rs-rx-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}
.rs-rx-modal {
  background: #fff;
  border-radius: 0.75rem;
  width: 100%;
  max-width: 720px;
  max-height: 90vh;
  overflow-y: auto;
  padding: 1.5rem;
  box-shadow: 0 20px 60px rgba(0,0,0,0.3);
  position: relative;
}
.rs-rx-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.75rem;
}
.rs-rx-header h3 {
  font-size: 1.125rem;
  font-weight: 700;
  color: #0f172a;
  margin: 0;
}
.rs-rx-close {
  background: none;
  border: none;
  font-size: 1.5rem;
  color: #94a3b8;
  cursor: pointer;
  padding: 0 0.25rem;
  line-height: 1;
}
.rs-rx-close:hover { color: #0f172a; }
.rs-rx-desc {
  font-size: 0.8125rem;
  color: #64748b;
  margin-bottom: 0.75rem;
  line-height: 1.4;
}
.rs-rx-examples {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
  flex-wrap: wrap;
}
.rs-rx-ex-btn {
  padding: 0.375rem 0.75rem;
  background: #f1f5f9;
  border: 1px solid #e2e8f0;
  border-radius: 0.375rem;
  font-size: 0.75rem;
  color: #475569;
  cursor: pointer;
}
.rs-rx-ex-btn:hover { background: #e2e8f0; color: #0f172a; }
.rs-rx-input {
  width: 100%;
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 0.75rem;
  line-height: 1.5;
  padding: 0.75rem;
  border: 1px solid #e2e8f0;
  border-radius: 0.5rem;
  resize: vertical;
  background: #f8fafc;
  color: #0f172a;
  tab-size: 16;
}
.rs-rx-input:focus { outline: 2px solid #6366f1; border-color: transparent; }
.rs-rx-settings {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  margin: 0.75rem 0;
  font-size: 0.75rem;
  color: #475569;
}
.rs-rx-settings label {
  display: flex;
  align-items: center;
  gap: 0.375rem;
}
.rs-rx-settings input[type="number"] {
  width: 56px;
  padding: 0.25rem 0.375rem;
  border: 1px solid #e2e8f0;
  border-radius: 0.25rem;
  font-size: 0.75rem;
  text-align: center;
}
.rs-rx-settings input[type="checkbox"] { accent-color: #6366f1; }
.rs-rx-preview { margin: 0.75rem 0; }
.rs-rx-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.75rem;
  font-family: 'JetBrains Mono', monospace;
}
.rs-rx-table th {
  background: #f1f5f9;
  padding: 0.375rem 0.5rem;
  text-align: left;
  font-weight: 600;
  color: #475569;
  border-bottom: 1px solid #e2e8f0;
  font-size: 0.6875rem;
  text-transform: uppercase;
}
.rs-rx-table td {
  padding: 0.375rem 0.5rem;
  border-bottom: 1px solid #f1f5f9;
  color: #0f172a;
}
.rs-rx-gap td { color: #94a3b8; font-style: italic; }
.rs-rx-stop td { color: #6366f1; font-weight: 500; }
.rs-rx-summary {
  font-size: 0.75rem;
  color: #64748b;
  margin-top: 0.5rem;
}
.rs-rx-error {
  padding: 0.5rem 0.75rem;
  background: rgba(239,68,68,0.08);
  color: #c00;
  border: 1px solid rgba(239,68,68,0.2);
  border-radius: 0.375rem;
  font-size: 0.8125rem;
  margin: 0.5rem 0;
}
.rs-rx-actions {
  display: flex;
  gap: 0.5rem;
  margin-top: 0.75rem;
}
.rs-rx-note {
  margin-top: 0.75rem;
  font-size: 0.6875rem;
  color: #94a3b8;
  line-height: 1.5;
}

/* Dark mode */
[data-theme="dark"] .rs-rx-modal { background: #1e293b; }
[data-theme="dark"] .rs-rx-header h3 { color: #f1f5f9; }
[data-theme="dark"] .rs-rx-close { color: #64748b; }
[data-theme="dark"] .rs-rx-close:hover { color: #f1f5f9; }
[data-theme="dark"] .rs-rx-desc { color: #94a3b8; }
[data-theme="dark"] .rs-rx-ex-btn { background: #334155; border-color: #475569; color: #cbd5e1; }
[data-theme="dark"] .rs-rx-ex-btn:hover { background: #475569; color: #f1f5f9; }
[data-theme="dark"] .rs-rx-input { background: #0f172a; border-color: #334155; color: #e2e8f0; }
[data-theme="dark"] .rs-rx-input:focus { outline-color: #818cf8; }
[data-theme="dark"] .rs-rx-settings { color: #94a3b8; }
[data-theme="dark"] .rs-rx-settings input[type="number"] { background: #0f172a; border-color: #334155; color: #e2e8f0; }
[data-theme="dark"] .rs-rx-table th { background: #334155; color: #94a3b8; border-bottom-color: #475569; }
[data-theme="dark"] .rs-rx-table td { color: #e2e8f0; border-bottom-color: #334155; }
[data-theme="dark"] .rs-rx-gap td { color: #64748b; }
[data-theme="dark"] .rs-rx-stop td { color: #818cf8; }

/* Mobile */
@media (max-width: 640px) {
  .rs-rx-modal { padding: 1rem; max-height: 95vh; }
  .rs-rx-settings { flex-direction: column; gap: 0.5rem; }
}