/* Components: nav, buttons, cards, badges, steps */

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: 0.75rem 1.75rem;
  font-size: var(--font-size-base);
  font-weight: 600;
  border-radius: var(--radius);
  transition: all var(--transition-base);
  white-space: nowrap;
}

.btn--primary {
  background: var(--color-accent);
  color: #fff;
}

.btn--primary:hover {
  background: var(--color-accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 4px 20px rgba(20, 79, 255, 0.3), 0 0 40px rgba(20, 79, 255, 0.15);
}

.btn--ghost {
  background: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.btn--ghost:hover {
  border-color: var(--color-border-hover);
  background: var(--color-surface);
}

.btn--sm {
  padding: 0.5rem 1.25rem;
  font-size: var(--font-size-sm);
}

.btn--inverted {
  background: #fff;
  color: var(--color-accent);
}

.btn--inverted:hover {
  background: #f0f0f0;
  transform: translateY(-1px);
}

/* --- Navigation --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  transition: background var(--transition-base), box-shadow var(--transition-base);
}

.nav--scrolled {
  background: rgba(10, 10, 10, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: var(--shadow-nav);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

.nav__logo {
  font-size: var(--font-size-xl);
  font-family: var(--font-heading);
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--color-text);
}

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.nav__link {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
}

.nav__link:hover {
  color: var(--color-text);
}

.nav__actions {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

/* Hamburger */
.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 4px;
  width: 32px;
}

.nav-hamburger__line {
  display: block;
  height: 2px;
  background: var(--color-text);
  border-radius: 1px;
  transition: transform var(--transition-base), opacity var(--transition-fast);
}

.nav-hamburger--open .nav-hamburger__line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-hamburger--open .nav-hamburger__line:nth-child(2) {
  opacity: 0;
}

.nav-hamburger--open .nav-hamburger__line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile menu */
.nav-mobile {
  display: none;
  position: fixed;
  top: var(--nav-height);
  left: 0;
  right: 0;
  background: rgba(10, 10, 10, 0.98);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  padding: var(--space-lg) var(--container-padding);
  flex-direction: column;
  gap: var(--space-md);
  border-bottom: 1px solid var(--color-border);
  transform: translateY(-10px);
  opacity: 0;
  transition: transform var(--transition-base), opacity var(--transition-base);
  pointer-events: none;
}

.nav-mobile--open {
  transform: translateY(0);
  opacity: 1;
  pointer-events: auto;
}

.nav-mobile__link {
  font-size: var(--font-size-lg);
  color: var(--color-text-muted);
  padding: var(--space-sm) 0;
  transition: color var(--transition-fast);
}

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

@media (max-width: 768px) {
  .nav__links,
  .nav__actions {
    display: none;
  }

  .nav-hamburger {
    display: flex;
  }

  .nav-mobile {
    display: flex;
  }
}

/* --- Cards --- */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  transition: transform var(--transition-slow), border-color var(--transition-base), box-shadow var(--transition-slow);
}

.card:hover {
  transform: translateY(-3px);
  border-color: var(--color-border-hover);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3), 0 0 0 1px rgba(255, 255, 255, 0.05);
}

.card__icon {
  font-size: 1.75rem;
  margin-bottom: var(--space-md);
  line-height: 1;
}

.card__title {
  font-size: var(--font-size-xl);
  font-family: var(--font-heading);
  font-weight: 600;
  margin-bottom: var(--space-sm);
  letter-spacing: var(--letter-spacing-tight);
}

.card__desc {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  line-height: 1.7;
}

.card__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.card__list-item {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  line-height: 1.5;
  padding-left: 1rem;
  position: relative;
}

.card__list-item::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--color-accent);
}

/* --- Problem grid (2x2) --- */
.problem-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
}

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

/* --- Platform grid (hero card + 2-col) --- */
.platform-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
}

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

/* --- Steps --- */
.steps {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  gap: 0;
}

.step {
  flex: 1;
  max-width: 320px;
  text-align: center;
  padding: 0 var(--space-md);
}

.step__number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--color-accent);
  color: #fff;
  font-size: var(--font-size-xl);
  font-family: var(--font-heading);
  font-weight: 700;
  margin-bottom: var(--space-md);
}

.step__title {
  font-size: var(--font-size-xl);
  font-family: var(--font-heading);
  font-weight: 600;
  letter-spacing: var(--letter-spacing-tight);
  margin-bottom: var(--space-sm);
}

.step__desc {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  line-height: 1.7;
}

.step__connector {
  width: 60px;
  height: 2px;
  background: var(--color-border);
  flex-shrink: 0;
  margin-top: 24px;
  position: relative;
}

.step__connector::after {
  content: '';
  position: absolute;
  right: -3px;
  top: -3px;
  width: 8px;
  height: 8px;
  border-right: 2px solid var(--color-accent);
  border-top: 2px solid var(--color-accent);
  transform: rotate(45deg);
}

@media (max-width: 768px) {
  .steps {
    flex-direction: column;
    align-items: center;
    gap: var(--space-lg);
  }

  .step {
    max-width: 400px;
  }

  .step__connector {
    width: 2px;
    height: 40px;
    margin-top: 0;
  }

  .step__connector::after {
    right: auto;
    top: auto;
    bottom: -3px;
    left: -3px;
    border-right: none;
    border-top: none;
    border-bottom: 2px solid var(--color-accent);
    border-right: 2px solid var(--color-accent);
    transform: rotate(45deg);
  }
}

/* --- Integration badges (kept for potential reuse) --- */
.badge-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-md);
}

@media (min-width: 480px) {
  .badge-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 768px) {
  .badge-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

@media (min-width: 992px) {
  .badge-grid {
    grid-template-columns: repeat(5, 1fr);
  }
}

.badge {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 0.625rem var(--space-md);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  transition: border-color var(--transition-fast), color var(--transition-fast);
}

.badge:hover {
  border-color: var(--color-border-hover);
  color: var(--color-text);
  box-shadow: 0 0 12px var(--color-accent-glow);
}

.badge__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

/* --- Architecture columns --- */
.architecture-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
}

@media (min-width: 768px) {
  .architecture-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.architecture-col__title {
  font-size: var(--font-size-lg);
  font-weight: 600;
  margin-bottom: var(--space-md);
  letter-spacing: var(--letter-spacing-tight);
}

.architecture-col__text {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  line-height: 1.7;
}

.architecture-col__text p + p {
  margin-top: var(--space-sm);
}