/* ==========================================================================
   Binance Components: Features, Steps, FAQ, and Notifications
   ========================================================================== */

/* ==========================================================================
   Features Grid (02 / BUILT FOR YOUR WORKFLOW)
   ========================================================================== */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.feature {
  padding: 22px 18px;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  transition: transform var(--transition-fast), border-color var(--transition-fast);
}

.feature:hover {
  transform: translateY(-2px);
  border-color: var(--border-strong);
}

.feature .num {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 800;
  color: var(--brand-primary);
  background: var(--brand-primary-bg);
  display: inline-flex;
  width: 32px;
  height: 32px;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(240, 185, 11, 0.28);
}

.feature h3 {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-primary);
  margin: 16px 0 8px;
}

.feature p {
  font-size: 12px;
  color: var(--text-secondary);
  line-height: 1.6;
  margin: 0;
}

/* ==========================================================================
   Steps Section (03 / FROM PLAN TO NUMBERS)
   ========================================================================== */
.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.step {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 22px 20px;
  position: relative;
  overflow: hidden;
}

.step::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background-color: var(--brand-primary);
}

.step b {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  color: var(--brand-primary);
  letter-spacing: 1px;
}

.step h3 {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-primary);
  margin: 10px 0 6px;
}

.step p {
  font-size: 12px;
  color: var(--text-secondary);
  line-height: 1.6;
  margin: 0;
}

/* ==========================================================================
   FAQ Section
   ========================================================================== */
.faq {
  max-width: 900px;
  margin: 0 auto 56px;
}

.faq details {
  border-bottom: 1px solid var(--border-subtle);
  padding: 16px 0;
  transition: background-color var(--transition-fast);
}

.faq details:first-of-type {
  border-top: 1px solid var(--border-subtle);
}

.faq summary {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-primary);
  cursor: pointer;
  line-height: 1.6;
  display: flex;
  align-items: center;
  justify-content: space-between;
  list-style: none;
}

.faq summary::-webkit-details-marker {
  display: none;
}

.faq summary::after {
  content: "+";
  font-size: 18px;
  font-family: var(--font-mono);
  font-weight: 400;
  color: var(--brand-primary);
  margin-inline-start: 12px;
  transition: transform var(--transition-fast);
}

.faq details[open] summary::after {
  content: "−";
  transform: rotate(180deg);
}

.faq details p {
  font-size: 13px;
  color: var(--text-secondary);
  margin: 12px 0 6px;
  line-height: 1.7;
}

.formula {
  display: block;
  direction: ltr;
  overflow-x: auto;
  white-space: pre;
  text-align: left;
  background: #121519;
  border: 1px solid var(--border-subtle);
  color: var(--brand-primary);
  padding: 14px 16px;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.8;
  margin: 14px 0;
}

/* ==========================================================================
   Toast Notification & Utilities
   ========================================================================== */
.toast {
  position: fixed;
  inset-inline: 24px;
  bottom: 24px;
  z-index: 200;
  max-width: 440px;
  margin: auto;
  background: #1E2329;
  color: var(--text-primary);
  text-align: center;
  border-radius: var(--radius-md);
  padding: 12px 20px;
  font-size: 13px;
  font-weight: 600;
  border: 1px solid var(--brand-primary);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.7);
  transition: transform var(--transition-normal), opacity var(--transition-normal);
}

.toast:empty {
  display: none;
}

[hidden] {
  display: none !important;
}

@media (max-width: 1000px) {
  .feature-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .feature-grid {
    grid-template-columns: 1fr;
  }
  .steps {
    grid-template-columns: 1fr;
  }
}