/* ==========================================================================
   MARIUM KUMAIL — EdTech Learning Design & Course Architecture
   Components & Interactive Widgets Stylesheet
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. HERO SECTION & GAP VISUALIZER
   -------------------------------------------------------------------------- */
.hero-section {
  padding-top: clamp(6.5rem, 11vw, 9.5rem);
  padding-bottom: clamp(4rem, 7vw, 6rem);
  position: relative;
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.95fr;
  gap: clamp(2rem, 4vw, 4rem);
  align-items: center;
}

@media (max-width: 992px) {
  .hero-grid {
    grid-template-columns: 1fr;
  }
}

.hero-content {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.4rem 1rem;
  border-radius: var(--radius-full);
  background: rgba(212, 163, 72, 0.1);
  border: 1px solid var(--border-gold);
  color: var(--gold-light);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: var(--space-md);
}

.hero-title {
  margin-bottom: var(--space-md);
  color: var(--text-primary);
}

.hero-subtitle {
  font-size: clamp(1.15rem, 1.9vw, 1.35rem);
  color: var(--text-secondary);
  line-height: 1.55;
  margin-bottom: var(--space-xl);
}

.hero-subtitle strong {
  color: var(--gold-light);
  font-weight: 600;
}

.hero-cta-group {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem;
  margin-bottom: var(--space-xl);
}

.hero-proof-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1.5rem;
  padding-top: var(--space-lg);
  border-top: 1px solid var(--border-subtle);
  width: 100%;
}

.proof-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.88rem;
  color: var(--text-muted);
}

.proof-item strong {
  color: var(--text-primary);
  font-weight: 600;
}

/* Interactive Hero Telemetry Gap Box */
.hero-visualizer-card {
  background: linear-gradient(145deg, rgba(13, 22, 34, 0.9) 0%, rgba(19, 32, 48, 0.75) 100%);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-xl);
  padding: clamp(1.4rem, 2.5vw, 2rem);
  box-shadow: var(--shadow-lg), 0 0 50px rgba(30, 58, 95, 0.25);
  position: relative;
}

.visualizer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-md);
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border-subtle);
}

.visualizer-title {
  font-size: 0.92rem;
  font-family: var(--font-mono);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.gap-metric-comparison {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.metric-box {
  background: rgba(7, 11, 17, 0.6);
  border-radius: var(--radius-md);
  padding: 1rem;
  border: 1px solid var(--border-subtle);
  position: relative;
  overflow: hidden;
}

.metric-box.vanity {
  border-color: rgba(148, 163, 184, 0.2);
}

.metric-box.reality {
  border-color: var(--border-crimson);
  background: rgba(239, 68, 68, 0.04);
}

.metric-label {
  font-size: 0.78rem;
  font-family: var(--font-mono);
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 0.35rem;
}

.metric-val {
  font-family: var(--font-mono);
  font-size: 1.9rem;
  font-weight: 700;
  line-height: 1.1;
}

.metric-val.vanity-val {
  color: #94A3B8;
}

.metric-val.reality-val {
  color: var(--crimson-alert);
}

.metric-sub {
  font-size: 0.75rem;
  color: var(--text-dim);
  margin-top: 0.25rem;
}

/* Canvas Graph Box */
.telemetry-chart-container {
  position: relative;
  width: 100%;
  height: 150px;
  background: rgba(7, 11, 17, 0.85);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  margin-bottom: 1.2rem;
  overflow: hidden;
}

#heroTelemetryCanvas {
  width: 100%;
  height: 100%;
  display: block;
}

.chart-annotation-badge {
  position: absolute;
  top: 10px;
  right: 12px;
  font-size: 0.75rem;
  font-family: var(--font-mono);
  background: rgba(239, 68, 68, 0.15);
  border: 1px solid var(--border-crimson);
  color: #FCA5A5;
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm);
  pointer-events: none;
}

/* Interactive Slider in Card */
.visualizer-slider-group {
  margin-top: 0.75rem;
}

.slider-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 0.4rem;
  font-family: var(--font-mono);
}

.gap-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  border-radius: var(--radius-full);
  background: linear-gradient(90deg, var(--emerald-primary) 0%, var(--gold-primary) 60%, var(--crimson-alert) 100%);
  outline: none;
  cursor: pointer;
}

.gap-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: #FFFFFF;
  border: 2px solid var(--gold-primary);
  box-shadow: 0 0 10px rgba(212, 163, 72, 0.8);
  cursor: pointer;
  transition: transform 120ms ease;
}

.gap-slider::-webkit-slider-thumb:hover {
  transform: scale(1.2);
}

.visualizer-footer {
  margin-top: 1rem;
  padding-top: 0.75rem;
  border-top: 1px dashed var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.82rem;
}

.leakage-tag {
  color: var(--crimson-alert);
  font-family: var(--font-mono);
  font-weight: 600;
}

/* --------------------------------------------------------------------------
   2. THE PROBLEM SECTION
   -------------------------------------------------------------------------- */
.problem-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  align-items: stretch;
  margin-top: var(--space-xl);
}

@media (max-width: 860px) {
  .problem-grid {
    grid-template-columns: 1fr;
  }
}

.problem-card {
  padding: var(--space-xl);
  border-radius: var(--radius-lg);
  display: flex;
  flex-direction: column;
}

.problem-card.opt-wrong {
  background: rgba(239, 68, 68, 0.03);
  border: 1px solid rgba(239, 68, 68, 0.2);
}

.problem-card.opt-missed {
  background: rgba(16, 185, 129, 0.03);
  border: 1px solid rgba(16, 185, 129, 0.2);
}

.card-icon-badge {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  margin-bottom: var(--space-md);
}

.opt-wrong .card-icon-badge {
  background: rgba(239, 68, 68, 0.12);
  color: var(--crimson-alert);
  border: 1px solid var(--border-crimson);
}

.opt-missed .card-icon-badge {
  background: rgba(16, 185, 129, 0.12);
  color: var(--emerald-light);
  border: 1px solid var(--border-emerald);
}

.check-list, .cross-list {
  list-style: none;
  margin-top: var(--space-md);
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.check-list li, .cross-list li {
  display: flex;
  align-items: flex-start;
  gap: 0.65rem;
  font-size: 0.98rem;
}

.check-list li span.icon {
  color: var(--emerald-light);
  font-weight: 700;
}

.cross-list li span.icon {
  color: #94A3B8;
}

.problem-data-callout {
  margin-top: 2.5rem;
  background: linear-gradient(135deg, rgba(13, 22, 34, 0.9) 0%, rgba(26, 44, 66, 0.4) 100%);
  border: 1px solid var(--border-gold);
  border-radius: var(--radius-lg);
  padding: var(--space-lg) var(--space-xl);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

@media (max-width: 768px) {
  .problem-data-callout {
    flex-direction: column;
    text-align: center;
  }
}

.callout-stat {
  font-family: var(--font-mono);
  font-size: 2.4rem;
  font-weight: 700;
  color: var(--gold-light);
  line-height: 1;
  white-space: nowrap;
}

/* --------------------------------------------------------------------------
   3. THE CORE SERVICES (SOLUTION)
   -------------------------------------------------------------------------- */
.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.8rem;
}

@media (max-width: 1024px) {
  .services-grid {
    grid-template-columns: 1fr;
  }
}

.service-card {
  background: var(--bg-glass-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: clamp(1.6rem, 2.5vw, 2.2rem);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: transform var(--duration-normal) var(--ease-out),
              border-color var(--duration-normal) var(--ease-out),
              box-shadow var(--duration-normal) var(--ease-out);
  position: relative;
}

.service-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-gold);
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.5), 0 0 25px rgba(212, 163, 72, 0.15);
}

.service-card.featured {
  border-color: var(--border-gold);
  background: linear-gradient(160deg, rgba(21, 35, 52, 0.85) 0%, rgba(13, 22, 34, 0.95) 100%);
}

.service-badge {
  position: absolute;
  top: 1.2rem;
  right: 1.2rem;
  font-size: 0.72rem;
  font-family: var(--font-mono);
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-full);
  background: rgba(212, 163, 72, 0.15);
  border: 1px solid var(--border-gold);
  color: var(--gold-light);
  text-transform: uppercase;
}

.service-num {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--gold-light);
  margin-bottom: 0.5rem;
}

.service-title {
  font-size: 1.45rem;
  margin-bottom: 0.85rem;
  line-height: 1.25;
}

.service-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  min-height: 50px;
}

.service-methodology {
  background: rgba(7, 11, 17, 0.5);
  border-radius: var(--radius-md);
  padding: 1.1rem;
  border: 1px solid var(--border-subtle);
  margin-bottom: 1.5rem;
}

.methodology-heading {
  font-size: 0.78rem;
  font-family: var(--font-mono);
  text-transform: uppercase;
  color: var(--text-muted);
  letter-spacing: 0.05em;
  margin-bottom: 0.6rem;
}

.method-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.method-list li {
  font-size: 0.88rem;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.method-list li::before {
  content: '→';
  color: var(--gold-light);
  font-weight: 700;
}

.deliverable-box {
  border-top: 1px solid var(--border-subtle);
  padding-top: 1.2rem;
  margin-bottom: 1.5rem;
}

.deliverable-title {
  font-size: 0.82rem;
  font-family: var(--font-mono);
  color: var(--emerald-light);
  text-transform: uppercase;
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.deliverable-text {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.45;
}

.service-pricing-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding-top: 1rem;
  border-top: 1px solid var(--border-subtle);
  margin-top: auto;
}

.price-tag {
  font-family: var(--font-mono);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text-primary);
}

.price-sub {
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* --------------------------------------------------------------------------
   4. INTERACTIVE DILEMMA / SCENARIO SANDBOX
   -------------------------------------------------------------------------- */
.sandbox-wrapper {
  background: linear-gradient(160deg, rgba(13, 22, 34, 0.95) 0%, rgba(19, 32, 48, 0.85) 100%);
  border: 1px solid var(--border-gold);
  border-radius: var(--radius-xl);
  padding: clamp(1.5rem, 3vw, 2.5rem);
  box-shadow: var(--shadow-lg), 0 0 60px rgba(212, 163, 72, 0.12);
  margin-top: var(--space-2xl);
}

.sandbox-mode-selector {
  display: flex;
  background: rgba(7, 11, 17, 0.8);
  border-radius: var(--radius-md);
  padding: 0.35rem;
  gap: 0.35rem;
  margin-bottom: 1.8rem;
  border: 1px solid var(--border-subtle);
  max-width: 500px;
}

.sandbox-tab {
  flex: 1;
  padding: 0.6rem 1rem;
  border-radius: var(--radius-sm);
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-out);
  text-align: center;
}

.sandbox-tab.active {
  background: var(--bg-elevated);
  color: var(--gold-light);
  border: 1px solid var(--border-gold);
  box-shadow: var(--shadow-sm);
}

.sandbox-display-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

@media (max-width: 860px) {
  .sandbox-display-grid {
    grid-template-columns: 1fr;
  }
}

.scenario-panel {
  background: rgba(7, 11, 17, 0.7);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  border: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
}

.scenario-panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border-subtle);
}

.panel-tag {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-sm);
}

.panel-tag.slide-tag {
  background: rgba(148, 163, 184, 0.1);
  color: #94A3B8;
  border: 1px solid rgba(148, 163, 184, 0.2);
}

.panel-tag.pedagogy-tag {
  background: rgba(16, 185, 129, 0.12);
  color: var(--emerald-light);
  border: 1px solid var(--border-emerald);
}

.decision-options-group {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-top: 1rem;
}

.decision-btn {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 0.85rem 1rem;
  color: var(--text-primary);
  text-align: left;
  font-size: 0.92rem;
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-out);
  display: flex;
  align-items: flex-start;
  gap: 0.65rem;
}

.decision-btn:hover {
  background: var(--bg-elevated);
  border-color: var(--border-gold);
}

.decision-btn.selected-correct {
  border-color: var(--emerald-primary);
  background: rgba(16, 185, 129, 0.12);
}

.decision-btn.selected-incorrect {
  border-color: var(--crimson-alert);
  background: rgba(239, 68, 68, 0.12);
}

.ai-reasoning-card {
  margin-top: 1rem;
  padding: 1rem;
  border-radius: var(--radius-md);
  background: rgba(212, 163, 72, 0.06);
  border: 1px solid var(--border-gold);
  font-size: 0.88rem;
  animation: fadeIn 300ms var(--ease-out);
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

/* --------------------------------------------------------------------------
   5. WHY THIS WORKS FOR EdTech (COMPARISON MATRIX)
   -------------------------------------------------------------------------- */
.stack-comparison-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: var(--space-xl);
  background: var(--bg-glass-card);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border-subtle);
}

.stack-comparison-table th,
.stack-comparison-table td {
  padding: 1.1rem 1.4rem;
  text-align: left;
  border-bottom: 1px solid var(--border-subtle);
}

.stack-comparison-table th {
  background: rgba(7, 11, 17, 0.8);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-muted);
  text-transform: uppercase;
}

.stack-comparison-table th.highlight-col {
  color: var(--gold-light);
  background: rgba(212, 163, 72, 0.08);
  border-left: 1px solid var(--border-gold);
  border-right: 1px solid var(--border-gold);
}

.stack-comparison-table td.highlight-col {
  background: rgba(212, 163, 72, 0.03);
  border-left: 1px solid var(--border-gold);
  border-right: 1px solid var(--border-gold);
  color: var(--text-primary);
  font-weight: 500;
}

/* --------------------------------------------------------------------------
   6. CASE STUDIES & PROOF
   -------------------------------------------------------------------------- */
.proof-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.8rem;
}

@media (max-width: 1024px) {
  .proof-grid {
    grid-template-columns: 1fr;
  }
}

.case-card {
  background: var(--bg-glass-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.case-client-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

.case-challenge {
  font-size: 0.92rem;
  color: var(--text-secondary);
  background: rgba(7, 11, 17, 0.4);
  padding: 0.85rem;
  border-radius: var(--radius-md);
  margin-bottom: 1rem;
  border-left: 2px solid var(--crimson-alert);
}

.case-solution {
  font-size: 0.92rem;
  color: var(--text-secondary);
  background: rgba(7, 11, 17, 0.4);
  padding: 0.85rem;
  border-radius: var(--radius-md);
  margin-bottom: 1.25rem;
  border-left: 2px solid var(--emerald-primary);
}

.case-review-box {
  background: rgba(212, 163, 72, 0.07);
  border: 1px solid var(--border-gold);
  border-radius: var(--radius-md);
  padding: 1rem;
  font-size: 0.9rem;
  font-style: italic;
  color: var(--gold-light);
  margin-top: auto;
}

.case-stars {
  color: #F59E0B;
  margin-bottom: 0.4rem;
  font-size: 0.88rem;
}

/* --------------------------------------------------------------------------
   7. CREDENTIALS MATRIX (6x GOOGLE CLOUD + B.ED)
   -------------------------------------------------------------------------- */
.credentials-layout {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 2.5rem;
  align-items: center;
}

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

.cred-education-card {
  background: linear-gradient(145deg, rgba(19, 32, 48, 0.9) 0%, rgba(13, 22, 34, 0.9) 100%);
  border: 1px solid var(--border-gold);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
}

.cert-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

@media (max-width: 600px) {
  .cert-grid {
    grid-template-columns: 1fr;
  }
}

.cert-pill {
  background: rgba(7, 11, 17, 0.7);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 0.85rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  transition: transform var(--duration-fast) var(--ease-out),
              border-color var(--duration-fast) var(--ease-out);
}

.cert-pill:hover {
  border-color: var(--border-emerald);
  transform: translateY(-2px);
}

.cert-icon-gcp {
  width: 32px;
  height: 32px;
  border-radius: 6px;
  background: rgba(66, 133, 244, 0.12);
  border: 1px solid rgba(66, 133, 244, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: #60A5FA;
  flex-shrink: 0;
}

.cert-info h5 {
  font-size: 0.85rem;
  color: var(--text-primary);
  line-height: 1.2;
}

.cert-info span {
  font-size: 0.72rem;
  font-family: var(--font-mono);
  color: var(--emerald-light);
}

/* --------------------------------------------------------------------------
   8. THE 4-STEP PROCESS TIMELINE
   -------------------------------------------------------------------------- */
.process-timeline {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  position: relative;
  margin-top: var(--space-xl);
}

@media (max-width: 992px) {
  .process-timeline {
    grid-template-columns: 1fr;
  }
}

.process-step {
  background: var(--bg-glass-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.6rem;
  position: relative;
  transition: transform var(--duration-fast) var(--ease-out), border-color var(--duration-fast);
}

.process-step:hover {
  transform: translateY(-3px);
  border-color: var(--gold-light);
}

.step-num-badge {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(212, 163, 72, 0.12);
  border: 1px solid var(--border-gold);
  color: var(--gold-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-weight: 700;
  margin-bottom: 1rem;
}

/* --------------------------------------------------------------------------
   9. WHO THIS IS FOR (PERSONAS)
   -------------------------------------------------------------------------- */
.persona-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.8rem;
}

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

.persona-card {
  background: var(--bg-glass-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  display: flex;
  flex-direction: column;
}

.persona-role-badge {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--gold-light);
  margin-bottom: 0.75rem;
}

.persona-pain {
  background: rgba(239, 68, 68, 0.05);
  border-left: 2px solid var(--crimson-alert);
  padding: 0.85rem;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin-bottom: 1.25rem;
  font-size: 0.92rem;
  font-style: italic;
}

.persona-solution {
  background: rgba(16, 185, 129, 0.05);
  border-left: 2px solid var(--emerald-primary);
  padding: 0.85rem;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  font-size: 0.92rem;
  margin-top: auto;
}

/* --------------------------------------------------------------------------
   10. INTERACTIVE ROI & LEAKAGE CALCULATOR
   -------------------------------------------------------------------------- */
.calculator-box {
  background: linear-gradient(145deg, rgba(13, 22, 34, 0.95) 0%, rgba(20, 35, 55, 0.85) 100%);
  border: 1px solid var(--border-gold);
  border-radius: var(--radius-xl);
  padding: clamp(1.8rem, 3vw, 2.5rem);
  box-shadow: var(--shadow-lg), 0 0 50px rgba(212, 163, 72, 0.15);
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 2.5rem;
  align-items: center;
}

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

.calc-input-group {
  margin-bottom: 1.5rem;
}

.calc-label-row {
  display: flex;
  justify-content: space-between;
  font-size: 0.9rem;
  margin-bottom: 0.4rem;
  color: var(--text-secondary);
}

.calc-label-row span.mono {
  color: var(--gold-light);
  font-weight: 700;
}

.calc-slider {
  width: 100%;
  height: 6px;
  border-radius: var(--radius-full);
  background: var(--bg-tertiary);
  outline: none;
  -webkit-appearance: none;
  cursor: pointer;
}

.calc-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--gold-light);
  border: 2px solid #070B11;
  box-shadow: 0 0 8px rgba(212, 163, 72, 0.8);
  cursor: pointer;
}

.calc-results-card {
  background: rgba(7, 11, 17, 0.8);
  border: 1px solid var(--border-crimson);
  border-radius: var(--radius-lg);
  padding: 1.8rem;
  text-align: center;
}

.calc-leakage-amount {
  font-family: var(--font-mono);
  font-size: clamp(2.2rem, 3.8vw, 3.2rem);
  font-weight: 800;
  color: var(--crimson-alert);
  line-height: 1.1;
  margin-block: 0.5rem;
}

/* --------------------------------------------------------------------------
   11. FAQ ACCORDION
   -------------------------------------------------------------------------- */
.faq-accordion {
  max-width: 860px;
  margin-inline: auto;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.faq-item {
  background: var(--bg-glass-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: border-color var(--duration-fast);
}

.faq-item.active {
  border-color: var(--border-gold);
}

.faq-trigger {
  width: 100%;
  padding: 1.3rem 1.6rem;
  background: transparent;
  border: none;
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 1.1rem;
  font-weight: 600;
  text-align: left;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.faq-trigger:active {
  transform: scale(0.99);
}

.faq-icon {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.05);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  color: var(--gold-light);
  transition: transform var(--duration-normal) var(--ease-out);
  flex-shrink: 0;
}

.faq-item.active .faq-icon {
  transform: rotate(45deg);
}

.faq-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--duration-smooth) var(--ease-out);
}

.faq-body {
  padding: 0 1.6rem 1.4rem;
  font-size: 0.98rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* --------------------------------------------------------------------------
   12. MODALS & FORMS
   -------------------------------------------------------------------------- */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 1000;
  background: rgba(3, 6, 10, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--duration-normal) var(--ease-out);
}

.modal-overlay.open {
  opacity: 1;
  pointer-events: auto;
}

.modal-card {
  background: linear-gradient(150deg, #0E1724 0%, #080D14 100%);
  border: 1px solid var(--border-gold);
  border-radius: var(--radius-xl);
  padding: clamp(1.8rem, 3.5vw, 2.5rem);
  width: 100%;
  max-width: 580px;
  max-height: 90vh;
  overflow-y: auto;
  position: relative;
  box-shadow: 0 25px 60px rgba(0, 0, 0, 0.8);
  transform: scale(0.95);
  transition: transform var(--duration-normal) var(--ease-out);
}

.modal-overlay.open .modal-card {
  transform: scale(1);
}

.modal-close-btn {
  position: absolute;
  top: 1.2rem;
  right: 1.2rem;
  background: transparent;
  border: 1px solid var(--border-subtle);
  color: var(--text-muted);
  width: 34px;
  height: 34px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 1.1rem;
  transition: color var(--duration-fast), border-color var(--duration-fast);
}

.modal-close-btn:hover {
  color: var(--gold-light);
  border-color: var(--border-gold);
}

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

.form-label {
  display: block;
  font-size: 0.85rem;
  font-family: var(--font-mono);
  color: var(--text-secondary);
  margin-bottom: 0.4rem;
}

.form-input, .form-select, .form-textarea {
  width: 100%;
  background: rgba(7, 11, 17, 0.8);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 0.75rem 1rem;
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  outline: none;
  transition: border-color var(--duration-fast);
}

.form-input:focus, .form-select:focus, .form-textarea:focus {
  border-color: var(--gold-light);
  box-shadow: 0 0 0 3px rgba(212, 163, 72, 0.15);
}

/* --------------------------------------------------------------------------
   13. TOAST NOTIFICATIONS (SONNER PRINCIPLES)
   -------------------------------------------------------------------------- */
.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 2000;
  display: flex;
  flex-direction: column;
  gap: 10px;
  pointer-events: none;
}

.toast {
  background: rgba(13, 22, 34, 0.95);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-gold);
  color: var(--text-primary);
  padding: 0.9rem 1.3rem;
  border-radius: var(--radius-md);
  font-size: 0.92rem;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.6);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  pointer-events: auto;
  transform: translateY(12px) scale(0.95);
  opacity: 0;
  transition: transform 200ms var(--ease-out), opacity 200ms var(--ease-out);
}

.toast.show {
  transform: translateY(0) scale(1);
  opacity: 1;
}

/* --------------------------------------------------------------------------
   14. FOOTER
   -------------------------------------------------------------------------- */
.site-footer {
  background: #04070B;
  border-top: 1px solid var(--border-subtle);
  padding-block: 4.5rem 2.5rem;
  position: relative;
  z-index: 1;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 2.5rem;
  margin-bottom: 3.5rem;
}

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

@media (max-width: 600px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }
}

.footer-bottom {
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.82rem;
  color: var(--text-dim);
}

@media (max-width: 600px) {
  .footer-bottom {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }
}