/* ============================================
   MatrixSolverOro — Tool/Calculator Styles
   File: css/tools.css
   Update: Edit this file for calculator UI changes
   ============================================ */

/* ── Matrix Input Grid ── */
.matrix-builder {
  margin: 18px 0;
}
.matrix-size-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  align-items: flex-end;
  margin-bottom: 20px;
  padding: 18px 20px;
  background: #f8fafc;
  border-radius: 12px;
  border: 1px solid var(--border);
}
.matrix-size-controls .form-group { margin-bottom: 0; }
.matrix-size-controls .form-label { font-size: 13px; }
.size-select {
  padding: 8px 14px;
  border: 2px solid var(--border);
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  background: #fff;
  cursor: pointer;
  transition: border-color .2s;
  min-width: 70px;
}
.size-select:focus { outline: none; border-color: var(--primary); }

.matrix-label {
  font-size: 15px;
  font-weight: 800;
  color: var(--primary);
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.matrix-grid-wrap {
  overflow-x: auto;
  padding-bottom: 6px;
}
.matrix-grid {
  display: inline-grid;
  gap: 6px;
  position: relative;
  padding: 16px 22px;
  background: #f8fafc;
  border-radius: 12px;
  border: 2px solid var(--border);
}
.matrix-grid::before,
.matrix-grid::after {
  content: '';
  position: absolute;
  top: 8px; bottom: 8px;
  width: 4px;
  border-radius: 2px;
  background: var(--primary);
  opacity: .5;
}
.matrix-grid::before { left: 6px; border-right: none; }
.matrix-grid::after { right: 6px; border-left: none; }
.matrix-cell {
  width: 64px;
  height: 48px;
  padding: 8px 6px;
  border: 1.5px solid var(--border);
  border-radius: 7px;
  font-size: 15px;
  font-weight: 600;
  font-family: var(--font-mono);
  text-align: center;
  color: var(--text);
  background: #fff;
  transition: all .2s;
  outline: none;
}
.matrix-cell:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(29,78,216,.12);
  background: #fff;
}
.matrix-cell:hover { border-color: var(--text-light); }
.matrix-cell.invalid { border-color: var(--danger); background: #fef2f2; }

/* Vector input (1-col) */
.vector-input .matrix-cell { width: 80px; }

/* Two-matrix layout */
.two-matrix-layout {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 20px;
  align-items: center;
  margin: 18px 0;
}
.matrix-op-symbol {
  font-size: 32px;
  font-weight: 900;
  color: var(--primary);
  text-align: center;
}

/* ── Calculator Wrapper ── */
.calc-card {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border);
  margin-bottom: 28px;
  overflow: hidden;
  will-change: transform;
}
.calc-header {
  background: linear-gradient(135deg, rgba(29,78,216,.06), rgba(8,145,178,.06));
  border-bottom: 1px solid var(--border);
  padding: 22px 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}
.calc-header-left { display: flex; align-items: center; gap: 14px; }
.calc-header-icon {
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 22px;
}
.calc-header h2 {
  font-size: 21px;
  font-weight: 800;
  color: var(--text);
}
.calc-header p { font-size: 13px; color: var(--text-light); margin: 2px 0 0; }
.calc-badges {
  display: flex;
  gap: 7px;
  flex-wrap: wrap;
}
.calc-badge {
  background: rgba(16,185,129,.1);
  color: #065f46;
  border: 1px solid rgba(16,185,129,.25);
  border-radius: 20px;
  padding: 4px 12px;
  font-size: 12px;
  font-weight: 700;
}
.calc-body { padding: 32px; }

/* ── Button Row ── */
.btn-row {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin: 22px 0;
}

/* ── Example Buttons ── */
.examples-section {
  margin: 16px 0;
  padding: 16px 18px;
  background: #fffbeb;
  border: 1px solid #fde68a;
  border-radius: 10px;
}
.examples-title {
  font-size: 13px;
  font-weight: 700;
  color: #92400e;
  margin-bottom: 10px;
}
.example-btns {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
}
.example-btn {
  padding: 6px 14px;
  background: #fff;
  border: 1.5px solid #fcd34d;
  border-radius: 7px;
  font-size: 13px;
  font-weight: 600;
  color: #92400e;
  cursor: pointer;
  transition: all .18s;
  font-family: var(--font-mono);
}
.example-btn:hover {
  background: #fef3c7;
  border-color: var(--accent);
}

/* ── Results Section ── */
.results-wrapper {
  margin-top: 24px;
}
.result-empty {
  text-align: center;
  padding: 48px 20px;
  color: var(--text-muted);
}
.result-empty .result-icon { font-size: 48px; margin-bottom: 14px; opacity: .5; }
.result-empty p { font-size: 15px; }

.result-card {
  background: #fff;
  border: 1.5px solid var(--border);
  border-radius: 14px;
  padding: 26px 28px;
  margin-bottom: 18px;
  box-shadow: var(--shadow-sm);
  transition: all .3s;
  will-change: transform;
}
.result-card:hover { box-shadow: var(--shadow); transform: translateY(-2px); }
.result-card-title {
  font-size: 16px;
  font-weight: 800;
  color: var(--primary);
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
  padding-bottom: 10px;
  border-bottom: 1.5px solid var(--border);
}
.result-card-title .rc-icon {
  width: 28px;
  height: 28px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 13px;
}

/* ── Math Display ── */
.math-display {
  background: #f8fafc;
  border-left: 4px solid var(--primary);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 16px 20px;
  margin: 12px 0;
  overflow-x: auto;
  font-size: 17px;
}
.math-display.answer {
  background: linear-gradient(135deg, rgba(29,78,216,.05), rgba(8,145,178,.05));
  border-left-color: var(--accent);
  font-size: 20px;
}
.katex-display { overflow-x: auto; overflow-y: hidden; }

/* ── Step-by-Step ── */
.steps-container { margin: 12px 0; }
.steps-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}
.steps-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 7px;
}
.toggle-steps-btn {
  font-size: 13px;
  font-weight: 600;
  color: var(--primary);
  cursor: pointer;
  background: rgba(29,78,216,.08);
  border: 1px solid rgba(29,78,216,.2);
  border-radius: 7px;
  padding: 5px 12px;
  transition: all .2s;
}
.toggle-steps-btn:hover { background: rgba(29,78,216,.14); }
.steps-list { list-style: none; }
.step-item {
  display: flex;
  gap: 14px;
  padding: 14px 16px;
  background: #fff;
  border: 1.5px solid var(--border);
  border-radius: 10px;
  margin-bottom: 10px;
  transition: all .25s;
  animation: stepIn .3s ease both;
}
@keyframes stepIn {
  from { opacity:0; transform:translateX(-12px); }
  to { opacity:1; transform:translateX(0); }
}
.step-item:hover { border-color: rgba(29,78,216,.2); transform: translateX(4px); }
.step-num {
  width: 30px;
  height: 30px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 800;
  flex-shrink: 0;
  margin-top: 1px;
}
.step-content { flex: 1; }
.step-rule {
  display: inline-block;
  background: #dbeafe;
  color: #1e40af;
  border-radius: 10px;
  padding: 2px 9px;
  font-size: 11.5px;
  font-weight: 700;
  margin-bottom: 6px;
}
.step-content p { font-size: 14.5px; color: var(--text); margin-bottom: 6px; }
.step-math {
  background: #f8fafc;
  border-radius: 7px;
  padding: 10px 14px;
  font-size: 15px;
  overflow-x: auto;
  margin-top: 6px;
}

/* ── Result Matrix Display ── */
.result-matrix-wrap {
  overflow-x: auto;
  margin: 14px 0;
}
.result-matrix {
  display: inline-grid;
  gap: 4px;
  background: #f8fafc;
  padding: 14px 22px;
  border-radius: 12px;
  border: 1.5px solid var(--border);
  position: relative;
}
.result-matrix::before,
.result-matrix::after {
  content: '';
  position: absolute;
  top: 6px; bottom: 6px;
  width: 3px;
  background: var(--primary);
  opacity: .6;
  border-radius: 2px;
}
.result-matrix::before { left: 5px; }
.result-matrix::after { right: 5px; }
.result-cell {
  padding: 8px 14px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 14.5px;
  font-weight: 600;
  font-family: var(--font-mono);
  text-align: center;
  min-width: 60px;
  color: var(--text);
}
.result-cell.highlight {
  background: rgba(29,78,216,.07);
  border-color: rgba(29,78,216,.25);
  color: var(--primary);
}
.result-cell.pivot {
  background: rgba(16,185,129,.1);
  border-color: rgba(16,185,129,.3);
  color: #065f46;
  font-weight: 700;
}

/* ── Augmented matrix (RREF) ── */
.augmented-divider {
  width: 2px;
  background: var(--danger);
  border-radius: 2px;
  align-self: stretch;
  margin: 0 4px;
}

/* ── Eigenvalue display ── */
.eigenvalue-list { margin: 12px 0; }
.eigen-item {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  padding: 14px 18px;
  background: var(--light);
  border: 1.5px solid var(--border);
  border-radius: 10px;
  margin-bottom: 10px;
}
.eigen-num {
  background: var(--primary);
  color: #fff;
  border-radius: 8px;
  padding: 4px 10px;
  font-size: 13px;
  font-weight: 700;
  white-space: nowrap;
}
.eigen-content { flex: 1; }
.eigen-label { font-size: 12.5px; color: var(--text-muted); font-weight: 600; margin-bottom: 4px; }
.eigen-value { font-size: 16px; font-weight: 700; color: var(--text); margin-bottom: 8px; }

/* ── Error / Success ── */
.calc-error {
  background: #fef2f2;
  border: 1.5px solid #fca5a5;
  border-radius: 10px;
  padding: 16px 20px;
  color: #991b1b;
  font-size: 14.5px;
  display: flex;
  gap: 10px;
  align-items: flex-start;
  margin: 14px 0;
}
.calc-success {
  background: #f0fdf4;
  border: 1.5px solid #86efac;
  border-radius: 10px;
  padding: 16px 20px;
  color: #166534;
  font-size: 14.5px;
  display: flex;
  gap: 10px;
  align-items: flex-start;
  margin: 14px 0;
}

/* ── Copy Button ── */
.copy-result-btn {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-light);
  background: var(--light);
  border: 1px solid var(--border);
  border-radius: 7px;
  padding: 5px 12px;
  cursor: pointer;
  transition: all .2s;
  display: inline-flex;
  align-items: center;
  gap: 5px;
}
.copy-result-btn:hover { background: var(--primary); color: #fff; border-color: var(--primary); }
.copy-result-btn.copied { background: var(--success); color: #fff; border-color: var(--success); }

/* ── Symbol Toolbar ── */
.symbol-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  margin: 10px 0;
}
.sym-btn {
  padding: 6px 10px;
  background: #fff;
  border: 1.5px solid var(--border);
  border-radius: 6px;
  font-size: 13px;
  font-weight: 600;
  color: var(--text);
  cursor: pointer;
  transition: all .18s;
  font-family: var(--font-mono);
  min-width: 36px;
  text-align: center;
}
.sym-btn:hover {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

/* ── Input Hint ── */
.input-hint {
  font-size: 12.5px;
  color: var(--text-muted);
  margin-top: 6px;
  display: flex;
  align-items: center;
  gap: 5px;
}

/* ── Tab system ── */
.tabs-nav {
  display: flex;
  gap: 0;
  border-bottom: 2px solid var(--border);
  margin-bottom: 22px;
  overflow-x: auto;
}
.tab-btn {
  padding: 11px 22px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-light);
  border: none;
  background: none;
  cursor: pointer;
  transition: all .2s;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  white-space: nowrap;
}
.tab-btn:hover { color: var(--primary); }
.tab-btn.active { color: var(--primary); border-bottom-color: var(--primary); }
.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* ── Method selector ── */
.method-row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 18px;
}
.method-btn {
  padding: 8px 18px;
  background: #fff;
  border: 2px solid var(--border);
  border-radius: 8px;
  font-size: 13.5px;
  font-weight: 600;
  color: var(--text);
  cursor: pointer;
  transition: all .2s;
}
.method-btn:hover { border-color: var(--primary); color: var(--primary); }
.method-btn.active {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: #fff;
  border-color: transparent;
}

/* ── Determinant expansion visualization ── */
.cofactor-grid {
  display: inline-grid;
  gap: 10px;
  margin: 14px 0;
  overflow-x: auto;
}
.cofactor-item {
  background: #fff;
  border: 1.5px solid var(--border);
  border-radius: 10px;
  padding: 14px;
  font-size: 14px;
}
.cofactor-item .sign { font-size: 18px; font-weight: 900; color: var(--primary); }

/* ── Worksheet styles ── */
.worksheet-preview {
  background: #fff;
  border: 1.5px solid var(--border);
  border-radius: 14px;
  padding: 30px;
  margin: 18px 0;
  min-height: 400px;
}
.worksheet-problem {
  margin-bottom: 28px;
  padding-bottom: 18px;
  border-bottom: 1px dashed var(--border);
}
.problem-num { font-weight: 800; color: var(--primary); margin-bottom: 8px; }
.answer-space {
  margin-top: 12px;
  height: 60px;
  border-bottom: 1.5px solid #cbd5e1;
  position: relative;
}
.answer-space::after {
  content: 'Answer:';
  position: absolute;
  left: 0;
  bottom: 4px;
  font-size: 12px;
  color: var(--text-muted);
}

/* ── Daily Challenge ── */
.challenge-card {
  background: linear-gradient(135deg, rgba(29,78,216,.06), rgba(8,145,178,.06));
  border: 2px solid rgba(29,78,216,.15);
  border-radius: var(--radius-lg);
  padding: 32px;
  text-align: center;
  margin: 18px 0;
}
.challenge-day {
  font-size: 13px;
  font-weight: 700;
  color: var(--text-light);
  text-transform: uppercase;
  letter-spacing: .08em;
  margin-bottom: 8px;
}
.challenge-title {
  font-size: 26px;
  font-weight: 900;
  color: var(--primary);
  margin-bottom: 10px;
}
.challenge-timer {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(245,158,11,.1);
  border: 1px solid rgba(245,158,11,.3);
  border-radius: 20px;
  padding: 5px 14px;
  font-size: 13px;
  font-weight: 700;
  color: #92400e;
  margin-bottom: 16px;
}

/* ── Quiz ── */
.quiz-option {
  width: 100%;
  padding: 14px 20px;
  background: #fff;
  border: 2px solid var(--border);
  border-radius: 10px;
  font-size: 15px;
  font-weight: 500;
  color: var(--text);
  cursor: pointer;
  transition: all .2s;
  text-align: left;
  margin-bottom: 10px;
  display: flex;
  gap: 12px;
  align-items: center;
}
.quiz-option:hover { border-color: var(--primary); background: rgba(29,78,216,.04); }
.quiz-option.correct { border-color: var(--success); background: #f0fdf4; color: #166534; }
.quiz-option.wrong { border-color: var(--danger); background: #fef2f2; color: #991b1b; }
.quiz-option-letter {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--light);
  border: 1.5px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 700;
  flex-shrink: 0;
  transition: all .2s;
}
.quiz-option:hover .quiz-option-letter { background: var(--primary); color: #fff; border-color: var(--primary); }

/* ── Community styles ── */
.post-card {
  background: #fff;
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  padding: 22px 26px;
  margin-bottom: 14px;
  transition: all .25s;
}
.post-card:hover { box-shadow: var(--shadow); transform: translateY(-2px); }
.post-header { display: flex; align-items: center; gap: 12px; margin-bottom: 10px; }
.post-avatar {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 14px;
  font-weight: 700;
  flex-shrink: 0;
}
.post-meta { flex: 1; }
.post-name { font-size: 14px; font-weight: 700; color: var(--text); }
.post-time { font-size: 12px; color: var(--text-muted); }
.post-body { font-size: 14.5px; color: var(--text); line-height: 1.65; }
.post-tags { display: flex; gap: 6px; flex-wrap: wrap; margin-top: 10px; }
.post-tag {
  background: rgba(29,78,216,.08);
  color: var(--primary);
  border-radius: 12px;
  padding: 3px 10px;
  font-size: 12px;
  font-weight: 600;
}
.post-actions {
  display: flex;
  gap: 14px;
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px solid var(--border);
}
.post-action-btn {
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-light);
  cursor: pointer;
  transition: color .2s;
  background: none;
  border: none;
  padding: 0;
}
.post-action-btn:hover { color: var(--primary); }

/* ── Mobile Responsive Overrides ── */
@media (max-width: 768px) {
  .calc-body { padding: 20px 16px; }
  .calc-header { padding: 18px 20px; }
  .matrix-cell { width: 52px; height: 42px; font-size: 13px; }
  .two-matrix-layout { grid-template-columns: 1fr; }
  .two-matrix-layout .matrix-op-symbol { display: none; }
  .btn-row { flex-direction: column; }
  .btn-row .btn-primary, .btn-row .btn-secondary { width: 100%; justify-content: center; }
  .result-card { padding: 18px 16px; }
}
@media (max-width: 480px) {
  .matrix-cell { width: 44px; height: 38px; font-size: 12px; padding: 4px; }
  .result-cell { min-width: 46px; padding: 6px 8px; font-size: 13px; }
  .step-item { flex-direction: column; gap: 8px; }
  .step-num { align-self: flex-start; }
}