/* ==========================================================================
   Components - Buttons, Cards, Badges, Navigation
   ========================================================================== */

/* --------------------------------------------------------------------------
   Buttons
   -------------------------------------------------------------------------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  min-height: 44px; /* Accessibility: minimum touch target */
  font-size: var(--text-base);
  font-weight: 600;
  line-height: 1;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: transform var(--transition-fast),
              box-shadow var(--transition-fast),
              background var(--transition-fast),
              border-color var(--transition-fast);
  text-decoration: none;
  white-space: nowrap;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* Primary Button */
.btn-primary {
  color: #ffffff;
  background: var(--color-accent-primary);
  font-weight: 600;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 20px rgba(0, 212, 170, 0.4);
}

.btn-primary:active {
  transform: translateY(0);
}

/* Secondary Button */
.btn-secondary {
  color: var(--color-text-primary);
  background: transparent;
  border: 2px solid var(--color-border-default);
}

.btn-secondary:hover {
  border-color: var(--color-accent-primary);
  background: rgba(0, 212, 170, 0.1);
}

/* Ghost Button */
.btn-ghost {
  color: var(--color-text-secondary);
  background: transparent;
  border: none;
}

.btn-ghost:hover {
  color: var(--color-text-primary);
  background: var(--color-bg-tertiary);
}

/* Button Sizes */
.btn-sm {
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
}

.btn-lg {
  padding: var(--space-4) var(--space-8);
  font-size: var(--text-lg);
}

.btn-xl {
  padding: var(--space-5) var(--space-10);
  font-size: var(--text-xl);
  border-radius: var(--radius-lg);
}

/* --------------------------------------------------------------------------
   Cards
   -------------------------------------------------------------------------- */

.card {
  background: var(--color-bg-tertiary);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  transition: border-color var(--transition-base),
              box-shadow var(--transition-base),
              transform var(--transition-base);
}

.card:hover {
  border-color: var(--color-accent-primary);
  box-shadow: var(--shadow-glow);
}

.card-elevated {
  background: var(--color-bg-elevated);
}

.card-title {
  font-size: var(--text-xl);
  font-weight: 700;
  margin-bottom: var(--space-4);
  color: var(--color-text-primary);
}

.card-description {
  color: var(--color-text-secondary);
  margin-bottom: var(--space-4);
}

/* --------------------------------------------------------------------------
   Badges
   -------------------------------------------------------------------------- */

.badge {
  display: inline-block;
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  background: rgba(0, 212, 170, 0.15);
  color: var(--color-accent-primary);
  border-radius: var(--radius-full);
}

.badge-secondary {
  background: rgba(99, 102, 241, 0.15);
  color: var(--color-accent-secondary);
}

.badge-warning {
  background: rgba(245, 158, 11, 0.15);
  color: var(--color-accent-warning);
}

/* --------------------------------------------------------------------------
   Navigation
   -------------------------------------------------------------------------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 10, 15, 0.9);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border-subtle);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.nav-logo {
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-text-primary);
  text-decoration: none;
}

.nav-logo:hover {
  color: var(--color-text-primary);
}

.nav-logo span {
  color: var(--color-accent-primary);
}

.nav-menu {
  display: none;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-menu a {
  color: var(--color-text-secondary);
  font-weight: 500;
  transition: color var(--transition-fast);
}

.nav-menu a:hover {
  color: var(--color-text-primary);
}

.nav-menu a.btn-primary,
.nav-menu.is-open a.btn-primary {
  color: #ffffff;
}

.nav-toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  padding: var(--space-2);
  background: transparent;
  border: none;
  cursor: pointer;
}

.nav-toggle-bar {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text-primary);
  border-radius: var(--radius-full);
  transition: var(--transition-fast);
}

/* Mobile Menu Open State */
.nav-menu.is-open {
  display: flex;
  flex-direction: column;
  position: absolute;
  top: 72px;
  left: 0;
  right: 0;
  background: var(--color-bg-secondary);
  border-bottom: 1px solid var(--color-border-subtle);
  padding: var(--space-4);
  gap: var(--space-4);
}

.nav-menu.is-open li {
  margin: 0;
}

.nav-menu.is-open a {
  display: block;
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
}

.nav-menu.is-open a:hover {
  background: var(--color-bg-tertiary);
}

/* Desktop Navigation */
@media (min-width: 768px) {
  .nav-toggle {
    display: none;
  }

  .nav-menu {
    display: flex;
    align-items: center;
    gap: var(--space-8);
    position: static;
    background: transparent;
    border: none;
    padding: 0;
    flex-direction: row;
  }

  .nav-menu li {
    margin: 0;
  }

  .nav-menu a {
    padding: var(--space-2) 0;
  }

  .nav-menu .btn {
    padding: var(--space-2) var(--space-5);
  }
}

/* --------------------------------------------------------------------------
   Screenshot Placeholder
   -------------------------------------------------------------------------- */

.screenshot-placeholder {
  background: var(--color-bg-secondary);
  border: 2px dashed var(--color-border-default);
  border-radius: var(--radius-xl);
  padding: var(--space-12) var(--space-8);
  text-align: center;
  color: var(--color-text-tertiary);
  min-height: 300px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
}

.screenshot-placeholder svg {
  width: 48px;
  height: 48px;
  opacity: 0.5;
}

/* --------------------------------------------------------------------------
   FAQ Accordion
   -------------------------------------------------------------------------- */

.faq-item {
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-4);
  overflow: hidden;
  background: var(--color-bg-tertiary);
}

.faq-item summary {
  padding: var(--space-5) var(--space-6);
  font-weight: 600;
  font-size: var(--text-lg);
  color: var(--color-text-primary);
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: background var(--transition-fast);
}

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

.faq-item summary::after {
  content: '+';
  font-size: var(--text-2xl);
  font-weight: 300;
  color: var(--color-accent-primary);
  transition: transform var(--transition-fast);
}

.faq-item[open] summary::after {
  transform: rotate(45deg);
}

.faq-item summary:hover {
  background: var(--color-bg-elevated);
}

.faq-answer {
  padding: 0 var(--space-6) var(--space-6);
}

.faq-answer p {
  margin-bottom: var(--space-4);
}

.faq-answer ul {
  margin-top: var(--space-2);
}

/* --------------------------------------------------------------------------
   Glossary
   -------------------------------------------------------------------------- */

.glossary-grid {
  display: grid;
  gap: var(--space-6);
}

@media (min-width: 768px) {
  .glossary-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.glossary-item {
  padding: var(--space-5);
  background: var(--color-bg-tertiary);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-lg);
}

.glossary-item dt {
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-accent-primary);
  margin-bottom: var(--space-2);
}

.glossary-item dd {
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* --------------------------------------------------------------------------
   Steps
   -------------------------------------------------------------------------- */

.steps-grid {
  display: grid;
  gap: var(--space-8);
  list-style: none;
  padding: 0;
  counter-reset: step;
}

@media (min-width: 768px) {
  .steps-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .steps-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.step-card {
  position: relative;
  padding: var(--space-8) var(--space-6);
  padding-top: var(--space-12);
  background: var(--color-bg-tertiary);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-xl);
  text-align: center;
}

.step-number {
  position: absolute;
  top: -20px;
  left: 50%;
  transform: translateX(-50%);
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-text-inverse);
  background: var(--gradient-primary);
  border-radius: var(--radius-full);
}

.step-title {
  font-size: var(--text-xl);
  margin-bottom: var(--space-4);
}

.step-card ul {
  text-align: left;
  padding-left: var(--space-4);
}

/* --------------------------------------------------------------------------
   Pricing Cards
   -------------------------------------------------------------------------- */

.pricing-grid {
  display: grid;
  gap: var(--space-6);
  max-width: 1200px;
  margin: 0 auto;
}

@media (min-width: 640px) {
  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .pricing-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.pricing-card {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: var(--space-6);
  background: var(--color-bg-tertiary);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-lg);
  text-align: center;
}

.pricing-card--popular {
  border-color: var(--color-accent-primary);
  border-width: 2px;
}

.pricing-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  background: var(--color-accent-primary);
  color: var(--color-text-inverse);
  border-radius: var(--radius-sm);
  white-space: nowrap;
}

.pricing-tier {
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: var(--space-1);
}

.pricing-subtitle {
  font-size: var(--text-sm);
  color: var(--color-text-tertiary);
  margin-bottom: var(--space-6);
}

.pricing-price {
  margin-bottom: var(--space-6);
}

.pricing-amount {
  font-size: var(--text-4xl);
  font-weight: 700;
  color: var(--color-text-primary);
}

.pricing-period {
  font-size: var(--text-base);
  color: var(--color-text-tertiary);
}

.pricing-features {
  list-style: none;
  padding: 0;
  margin: 0 0 var(--space-6) 0;
  text-align: left;
  flex-grow: 1;
}

.pricing-features li {
  display: flex;
  align-items: flex-start;
  gap: var(--space-2);
  padding: var(--space-2) 0;
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
}

.pricing-features li::before {
  content: '\2713';
  color: var(--color-accent-primary);
  font-weight: 700;
  flex-shrink: 0;
}

.pricing-card .btn {
  width: 100%;
  margin-top: auto;
}

.pricing-footer {
  text-align: center;
  margin-top: var(--space-8);
  color: var(--color-text-secondary);
}

.pricing-footer a {
  color: var(--color-accent-primary);
  text-decoration: none;
}

.pricing-footer a:hover {
  text-decoration: underline;
}