/* DCF Page Specific Styles */

/* Sidebar Menu (Category Style) */
.dcf-menu {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.dcf-menu-item {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 0.75rem;
  padding: 0.8rem 1rem;
  background: transparent;
  border: 1px solid transparent;
  border-radius: 12px;
  cursor: pointer;
  font-family: inherit;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all 0.2s ease;
  text-align: left;
  line-height: 1.3;
  width: 100%;
}

.dcf-menu-item:hover:not([disabled]) {
  background: rgba(37, 99, 235, 0.05);
  color: var(--primary-color);
}

/* Active State: Matching Premium Sidebar Style */
.dcf-menu-item.active {
  background: rgba(37, 99, 235, 0.08) !important;
  color: var(--primary-color) !important;
  font-weight: 700;
  border-color: rgba(37, 99, 235, 0.1);
}

.dcf-menu-item.active i {
  color: var(--primary-color) !important;
}

.dcf-menu-item[disabled] {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

/* Icons in menu */
.dcf-menu-item i {
  width: 20px;
  text-align: center;
  font-size: 1rem;
  flex-shrink: 0;
}

/* Content Area */
.dcf-content-area {
  background: white;
  border-radius: 16px;
  padding: 2.5rem;
  border: 1px solid var(--border-color);
  min-height: 500px;
}

.dcf-section {
  display: none;
  animation: fadeIn 0.4s ease;
}

.dcf-section.active {
  display: block;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.dcf-section h2 {
  font-size: 1.8rem;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.dcf-section h3 {
  font-size: 1.3rem;
  margin-top: 2.5rem;
  margin-bottom: 1rem;
  color: var(--text-primary);
  border-left: 4px solid var(--primary-color);
  padding-left: 0.8rem;
}

.tag-line {
  color: var(--text-secondary);
  font-size: 1rem;
  margin-bottom: 2rem;
  font-family: "JetBrains Mono", monospace;
}

/* Content Box */
.content-box {
  background: #f8fafc;
  padding: 1.5rem;
  border-radius: 8px;
  line-height: 1.7;
  color: #334155;
  border: 1px solid #e2e8f0;
}

.content-box.highlight {
  background: #eff6ff;
  border-color: #bfdbfe;
  color: #1e3a8a;
}

/* Grid Cards (Overview) */
.grid-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.5rem;
  margin-top: 1.5rem;
}

.info-card {
  background: white;
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 1.5rem;
  text-align: center;
  transition: transform 0.2s;
}

.info-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

.info-card .icon {
  width: 50px;
  height: 50px;
  background: #f0f9ff;
  color: var(--primary-color);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin: 0 auto 1rem;
}

.info-card h4 {
  margin: 0.5rem 0;
  font-size: 1.1rem;
}

.info-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* Formula Box (DCF) */
.formula-box {
  background: #1e293b;
  color: white;
  padding: 2rem;
  border-radius: 12px;
  margin: 1.5rem 0;
  text-align: center;
}

.formula {
  font-family: "JetBrains Mono", monospace;
  font-size: 1.2rem;
  margin-bottom: 0;
}

/* Process Steps */
.process-steps {
  display: flex;
  gap: 1.5rem;
  margin-top: 1.5rem;
}

.step {
  flex: 1;
  background: white;
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 1.5rem;
  position: relative;
}

.step-num {
  position: absolute;
  top: -15px;
  left: 1.5rem;
  width: 30px;
  height: 30px;
  background: var(--primary-color);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
}

.step h4 {
  margin-top: 0.5rem;
  margin-bottom: 0.5rem;
}

.step p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* Method List */
.method-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1rem;
  margin-top: 1rem;
}

.method-item {
  background: white;
  border: 1px solid #e2e8f0;
  border-radius: 8px;
  padding: 1rem;
}

.method-item strong {
  display: block;
  color: #2563eb;
  margin-bottom: 0.4rem;
}

.method-item p {
  margin: 0;
  font-size: 0.9rem;
  color: #64748b;
}

/* Calculator Styles */
.calc-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
}

.calc-input-section {
  background: #f8fafc;
  padding: 1.5rem;
  border-radius: 12px;
  border: 1px solid #e2e8f0;
}

.calc-result-section {
  background: white;
  border: 1px solid #e2e8f0;
  border-radius: 12px;
  padding: 1.5rem;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
}

.input-group {
  margin-bottom: 1.2rem;
}

.input-group label {
  display: block;
  font-weight: 500;
  margin-bottom: 0.5rem;
  font-size: 0.9rem;
  color: #1e293b;
}

.input-group input {
  width: 100%;
  padding: 0.8rem;
  border: 1px solid #cbd5e1;
  border-radius: 8px;
  font-family: inherit;
  font-size: 1rem;
  transition: border-color 0.2s;
}

.input-group input:focus {
  outline: none;
  border-color: #2563eb;
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.input-hint {
  font-size: 0.8rem;
  color: #64748b;
  margin-top: 0.3rem;
}

.btn-calculate {
  width: 100%;
  padding: 1rem;
  background: #2563eb;
  color: white;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s;
  margin-top: 1rem;
}

.btn-calculate:hover {
  background: #1d4ed8;
}

.result-value {
  font-size: 2rem;
  font-weight: 800;
  color: #2563eb;
  margin: 1rem 0;
}

.result-row {
  display: flex;
  justify-content: space-between;
  padding: 0.8rem 0;
  border-bottom: 1px solid #f1f5f9;
  font-size: 0.95rem;
}

.result-row:last-child {
  border-bottom: none;
}

.result-label {
  color: #64748b;
}

/* Concept Cards (Pre/Post) */
.concept-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  margin-top: 1.5rem;
}

.concept-card {
  padding: 1.5rem;
  border-radius: 12px;
  transition: transform 0.2s;
}

.concept-card.pre {
  background: #fffbeb;
  border: 1px solid #fcd34d;
}

.concept-card.post {
  background: #ecfdf5;
  border: 1px solid #6ee7b7;
}

.concept-card h4 {
  margin-top: 0;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.1rem;
}

.concept-card.pre h4 {
  color: #b45309;
}
.concept-card.post h4 {
  color: #047857;
}

.concept-desc {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 0.8rem;
}

.concept-card.pre .concept-desc {
  color: #92400e;
}
.concept-card.post .concept-desc {
  color: #065f46;
}

.concept-list {
  padding-left: 1.2rem;
  margin-bottom: 0;
  font-size: 0.9rem;
  line-height: 1.6;
}

.concept-card.pre .concept-list {
  color: #78350f;
}
.concept-card.post .concept-list {
  color: #064e3b;
}

@media (max-width: 900px) {
  .calc-container {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .process-steps {
    flex-direction: column;
  }
}