/**
 * FAST Design System v2 — Components
 * Sprint 4 · BEM: .fast-{component}[-modifier][__element]
 */

/* ─── Button ─── */
.fast-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  border: 1px solid transparent;
  border-radius: var(--radius-full);
  font-family: var(--font-body);
  font-weight: 600;
  line-height: 1;
  white-space: nowrap;
  cursor: pointer;
  transition:
    transform var(--duration-normal) var(--ease-out),
    background-color var(--duration-normal) var(--ease-out),
    border-color var(--duration-normal) var(--ease-out),
    box-shadow var(--duration-normal) var(--ease-out),
    color var(--duration-normal) var(--ease-out);
}

.fast-btn:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
}

.fast-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none !important;
}

.fast-btn--sm {
  min-height: 40px;
  padding: var(--space-3) var(--space-5);
  font-size: var(--text-body-sm);
}

.fast-btn--md {
  min-height: 48px;
  padding: var(--space-3) var(--space-6);
  font-size: var(--text-body-sm);
}

.fast-btn--lg {
  min-height: 52px;
  padding: 14px var(--space-8);
  font-size: var(--text-body);
}

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

.fast-btn--primary:hover:not(:disabled) {
  background: var(--color-brand-primary-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-glow-primary);
}

.fast-btn--secondary {
  background: transparent;
  border-color: var(--color-border-default);
  color: var(--color-text-primary);
}

.fast-btn--secondary:hover:not(:disabled) {
  border-color: var(--color-border-strong);
  transform: translateY(-1px);
}

.fast-btn--ghost {
  background: transparent;
  color: var(--color-text-muted);
  padding-inline: 0;
  min-height: auto;
}

.fast-btn--ghost:hover:not(:disabled) {
  color: var(--color-text-primary);
}

.fast-btn--danger {
  background: var(--color-danger-muted);
  color: var(--color-danger);
}

.fast-btn--block {
  width: 100%;
}

.fast-btn__icon {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

.fast-btn-group {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

/* ─── Link ─── */
.fast-link {
  color: var(--color-text-muted);
  transition: color var(--duration-fast) var(--ease-out);
}

.fast-link:hover {
  color: var(--color-text-primary);
}

.fast-link--inline {
  color: var(--color-text-secondary);
}

.fast-link--inline:hover {
  color: var(--color-brand-accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.fast-link--arrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-body-sm);
  font-weight: 500;
}

.fast-link--arrow svg {
  width: 16px;
  height: 16px;
  transition: transform var(--duration-normal) var(--ease-out);
}

.fast-link--arrow:hover svg {
  transform: translateX(3px);
}

/* ─── Card ─── */
.fast-card {
  background: var(--color-bg-surface);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  transition:
    transform var(--duration-normal) var(--ease-out),
    border-color var(--duration-normal) var(--ease-out),
    background-color var(--duration-normal) var(--ease-out);
}

.fast-card:hover {
  border-color: var(--color-border-default);
  transform: translateY(-2px);
}

.fast-card--featured {
  background: var(--color-brand-primary-muted);
  border-color: rgba(37, 99, 235, 0.25);
}

.fast-card--metric {
  text-align: center;
  padding: var(--space-8) var(--space-4);
}

.fast-card--metric:hover {
  transform: none;
}

.fast-card--static:hover {
  transform: none;
  border-color: var(--color-border-subtle);
}

.fast-card__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  margin-bottom: var(--space-4);
  border-radius: var(--radius-md);
  background: var(--color-bg-raised);
  color: var(--color-text-secondary);
}

.fast-card__icon svg {
  width: 20px;
  height: 20px;
}

.fast-card__title {
  margin-bottom: var(--space-3);
  font-size: var(--text-heading);
  line-height: var(--leading-heading);
}

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

.fast-card__value {
  display: block;
  margin-bottom: var(--space-2);
  font-family: var(--font-display);
  font-size: var(--text-display-md);
  font-weight: 600;
  color: var(--color-text-primary);
}

.fast-card__label {
  font-size: var(--text-caption);
  color: var(--color-text-muted);
}

/* ─── Badge ─── */
.fast-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  font-size: var(--text-overline);
  font-weight: 600;
  letter-spacing: var(--tracking-overline);
  line-height: 1.4;
}

.fast-badge--overline {
  border: 1px solid var(--color-border-subtle);
  color: var(--color-brand-accent);
  text-transform: uppercase;
}

.fast-badge--live {
  color: var(--color-success);
  background: rgba(74, 222, 128, 0.08);
}

.fast-badge--live::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
  animation: fast-pulse 2s ease-in-out infinite;
}

.fast-badge--tag {
  color: var(--color-text-muted);
  background: var(--color-bg-raised);
  font-size: var(--text-overline);
  letter-spacing: 0.02em;
  text-transform: none;
}

@keyframes fast-pulse {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0.45;
  }
}

/* ─── Navbar ─── */
.fast-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-height);
  background: var(--color-bg-overlay);
  border-bottom: 1px solid var(--color-border-subtle);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

.fast-nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  gap: var(--space-6);
}

.fast-nav__brand img {
  height: 28px;
  width: auto;
}

.fast-nav__links {
  display: none;
  align-items: center;
  gap: var(--space-1);
}

.fast-nav__link {
  padding: var(--space-2) 14px;
  border-radius: var(--radius-sm);
  font-size: var(--text-body-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  transition: color var(--duration-fast) var(--ease-out);
}

.fast-nav__link:hover,
.fast-nav__link.is-active {
  color: var(--color-text-primary);
}

.fast-nav__actions {
  display: none;
  align-items: center;
  gap: var(--space-3);
}

.fast-nav__locale {
  font-size: var(--text-caption);
  color: var(--color-text-muted);
}

.fast-nav__locale a.is-active {
  color: var(--color-text-primary);
}

.fast-nav__toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-md);
  background: transparent;
  color: var(--color-text-primary);
  cursor: pointer;
}

.fast-nav__toggle svg {
  width: 22px;
  height: 22px;
}

@media (min-width: 1024px) {
  .fast-nav__links,
  .fast-nav__actions {
    display: flex;
  }

  .fast-nav__toggle {
    display: none;
  }
}

/* ─── Drawer ─── */
.fast-drawer-backdrop {
  position: fixed;
  inset: 0;
  z-index: 110;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  opacity: 0;
  visibility: hidden;
  transition:
    opacity var(--duration-normal) var(--ease-out),
    visibility var(--duration-normal) var(--ease-out);
}

.fast-drawer-backdrop.is-open {
  opacity: 1;
  visibility: visible;
}

.fast-drawer {
  position: fixed;
  top: 0;
  right: 0;
  z-index: 120;
  width: min(var(--drawer-width), 100vw);
  height: 100%;
  padding: var(--space-8) var(--space-6);
  background: var(--color-bg-surface);
  border-left: 1px solid var(--color-border-subtle);
  transform: translateX(100%);
  transition: transform 500ms var(--ease-out);
  overflow-y: auto;
}

.fast-drawer.is-open {
  transform: translateX(0);
}

.fast-drawer__links {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin-top: var(--space-8);
}

.fast-drawer__link {
  padding: var(--space-3) var(--space-2);
  font-size: var(--text-body);
  font-weight: 500;
  color: var(--color-text-secondary);
}

.fast-drawer__divider {
  height: 1px;
  margin-block: var(--space-6);
  background: var(--color-border-subtle);
}

/* ─── Form ─── */
.fast-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

.fast-form__row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-4);
}

.fast-form__field {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.fast-form__field--full {
  grid-column: 1 / -1;
}

.fast-form__label {
  font-size: var(--text-caption);
  font-weight: 500;
  color: var(--color-text-secondary);
}

.fast-form__label-required {
  color: var(--color-danger);
}

.fast-form__input,
.fast-form__select,
.fast-form__textarea {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-md);
  background: var(--color-bg-surface);
  color: var(--color-text-primary);
  box-shadow: var(--shadow-sm);
  transition:
    border-color var(--duration-fast) var(--ease-out),
    box-shadow var(--duration-fast) var(--ease-out);
}

.fast-form__input::placeholder,
.fast-form__textarea::placeholder {
  color: var(--color-text-disabled);
}

.fast-form__input:focus,
.fast-form__select:focus,
.fast-form__textarea:focus {
  outline: none;
  border-color: var(--color-brand-primary);
  box-shadow: var(--focus-ring);
}

.fast-form__input.is-error,
.fast-form__select.is-error,
.fast-form__textarea.is-error {
  border-color: var(--color-danger);
}

.fast-form__error {
  font-size: var(--text-caption);
  color: var(--color-danger);
}

.fast-form__checkbox {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  font-size: var(--text-body-sm);
  color: var(--color-text-muted);
}

.fast-form__checkbox input {
  margin-top: 3px;
  accent-color: var(--color-brand-primary);
}

.fast-form__note {
  font-size: var(--text-caption);
  color: var(--color-text-muted);
}

@media (max-width: 767px) {
  .fast-form__row {
    grid-template-columns: 1fr;
  }
}

/* ─── Accordion ─── */
.fast-accordion {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.fast-accordion__item {
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.fast-accordion__trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: var(--space-4) var(--space-5);
  border: none;
  background: var(--color-bg-surface);
  color: var(--color-text-primary);
  font-weight: 500;
  text-align: left;
  cursor: pointer;
}

.fast-accordion__trigger svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  color: var(--color-text-muted);
  transition: transform 200ms var(--ease-out);
}

.fast-accordion__item.is-open .fast-accordion__trigger svg {
  transform: rotate(180deg);
}

.fast-accordion__panel {
  display: none;
  padding: 0 var(--space-5) var(--space-5);
  font-size: var(--text-body-sm);
  color: var(--color-text-muted);
}

.fast-accordion__item.is-open .fast-accordion__panel {
  display: block;
}

/* ─── Pricing tier ─── */
.fast-pricing {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-6);
  align-items: stretch;
}

.fast-pricing__tier {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
  min-height: 100%;
  padding: var(--space-8) var(--space-6);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-xl);
  background: var(--color-bg-surface);
}

.fast-pricing__tier--featured {
  background: var(--color-brand-primary-muted);
  border-color: rgba(37, 99, 235, 0.25);
}

.fast-pricing__name {
  font-size: var(--text-heading);
}

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

.fast-pricing__features {
  display: flex;
  flex: 1;
  flex-direction: column;
  gap: var(--space-3);
  font-size: var(--text-body-sm);
  color: var(--color-text-secondary);
}

.fast-pricing__features li {
  display: flex;
  gap: var(--space-2);
  align-items: flex-start;
}

.fast-pricing__features svg {
  width: 16px;
  height: 16px;
  margin-top: 2px;
  flex-shrink: 0;
  color: var(--color-brand-accent);
}

.fast-pricing__cta {
  margin-top: auto;
}

@media (max-width: 1023px) {
  .fast-pricing {
    grid-template-columns: 1fr;
  }
}

/* ─── Product frame (real screenshot container) ─── */
.fast-product-frame {
  border: 1px solid var(--color-border-default);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  background: var(--color-bg-surface);
}

.fast-product-frame__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-4) var(--space-6);
  border-bottom: 1px solid var(--color-border-subtle);
  background: var(--color-bg-raised);
}

.fast-product-frame__title {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--text-body-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
}

.fast-product-frame__dots {
  display: flex;
  gap: 6px;
}

.fast-product-frame__dots span {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-border-default);
}

.fast-product-frame__caption {
  margin-top: var(--space-3);
  font-size: var(--text-caption);
  color: var(--color-text-muted);
}

.fast-product-frame__media {
  display: block;
  width: 100%;
  height: auto;
  vertical-align: middle;
}

.fast-product-frame__placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 320px;
  padding: var(--space-8);
  background: linear-gradient(180deg, var(--color-bg-raised), var(--color-bg-surface));
  color: var(--color-text-muted);
  font-size: var(--text-body-sm);
  text-align: center;
}

/* ─── Compare panels (Problem / Solution) ─── */
.fast-compare {
  display: grid;
  grid-template-columns: 5fr 2fr 5fr;
  gap: var(--space-6);
  align-items: stretch;
}

.fast-compare__panel {
  padding: var(--space-8);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-xl);
  background: var(--color-bg-surface);
}

.fast-compare__panel-title {
  margin-bottom: var(--space-5);
  font-size: var(--text-heading);
}

.fast-compare__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.fast-compare__list li {
  display: flex;
  gap: var(--space-3);
  align-items: flex-start;
  font-size: var(--text-body-sm);
  color: var(--color-text-secondary);
}

.fast-compare__list svg {
  width: 16px;
  height: 16px;
  margin-top: 2px;
  flex-shrink: 0;
}

.fast-compare__list--problem svg {
  color: var(--color-text-muted);
}

.fast-compare__list--solution svg {
  color: var(--color-success);
}

.fast-compare__bridge {
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-size: var(--text-heading);
  font-weight: 600;
  color: var(--color-brand-accent);
}

@media (max-width: 1023px) {
  .fast-compare {
    grid-template-columns: 1fr;
  }

  .fast-compare__bridge {
    padding-block: var(--space-2);
  }
}

/* ─── Architecture diagram ─── */
.fast-arch {
  display: grid;
  grid-template-columns: 3fr 6fr 3fr;
  gap: var(--space-6);
  align-items: stretch;
}

.fast-arch__col {
  padding: var(--space-6);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-xl);
  background: var(--color-bg-surface);
}

.fast-arch__col--core {
  background: var(--color-brand-primary-muted);
  border-color: rgba(37, 99, 235, 0.25);
}

.fast-arch__label {
  margin-bottom: var(--space-4);
  font-size: var(--text-overline);
  font-weight: 600;
  letter-spacing: var(--tracking-overline);
  text-transform: uppercase;
  color: var(--color-text-muted);
}

.fast-arch__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  font-size: var(--text-body-sm);
  color: var(--color-text-secondary);
}

.fast-arch__core-title {
  margin-bottom: var(--space-3);
  font-size: var(--text-heading);
  color: var(--color-text-primary);
}

@media (max-width: 1023px) {
  .fast-arch {
    grid-template-columns: 1fr;
  }
}

/* ─── Module pills ─── */
.fast-pills {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  align-items: center;
}

.fast-pills--scroll {
  flex-wrap: nowrap;
  overflow-x: auto;
  padding-bottom: var(--space-2);
  scrollbar-width: thin;
}

.fast-pill {
  display: inline-flex;
  align-items: center;
  padding: var(--space-2) var(--space-4);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-full);
  font-size: var(--text-body-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  white-space: nowrap;
  transition:
    border-color var(--duration-fast) var(--ease-out),
    color var(--duration-fast) var(--ease-out);
}

.fast-pill:hover {
  border-color: var(--color-border-default);
  color: var(--color-text-primary);
}

/* ─── Trust strip ─── */
.fast-trust {
  padding-block: var(--space-16);
  background: var(--color-bg-raised);
}

.fast-trust__grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: var(--space-4);
}

@media (max-width: 1023px) {
  .fast-trust__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 767px) {
  .fast-trust__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* ─── Divider ─── */
.fast-divider {
  height: 1px;
  margin-block: var(--space-16);
  background: var(--color-border-subtle);
}

/* ─── Footer ─── */
.fast-footer {
  padding-block: var(--space-16) var(--space-8);
  border-top: 1px solid var(--color-border-subtle);
}

.fast-footer__grid {
  display: grid;
  grid-template-columns: 2fr repeat(3, 1fr);
  gap: var(--space-8);
}

.fast-footer__brand img {
  height: 24px;
  margin-bottom: var(--space-4);
}

.fast-footer__prose {
  max-width: 280px;
  font-size: var(--text-body-sm);
  color: var(--color-text-muted);
}

.fast-footer__credit {
  margin-top: var(--space-4);
  font-size: var(--text-caption);
  color: var(--color-text-disabled);
}

.fast-footer__col-title {
  margin-bottom: var(--space-4);
  font-size: var(--text-caption);
  font-weight: 600;
  letter-spacing: var(--tracking-overline);
  text-transform: uppercase;
  color: var(--color-text-muted);
}

.fast-footer__links {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.fast-footer__links a {
  font-size: var(--text-body-sm);
  color: var(--color-text-muted);
}

.fast-footer__links a:hover {
  color: var(--color-text-primary);
}

.fast-footer__bar {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  justify-content: space-between;
  margin-top: var(--space-12);
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-border-subtle);
  font-size: var(--text-caption);
  color: var(--color-text-muted);
}

@media (max-width: 1023px) {
  .fast-footer__grid {
    grid-template-columns: 1fr 1fr;
  }

  .fast-footer__brand {
    grid-column: 1 / -1;
  }
}

@media (max-width: 767px) {
  .fast-footer__grid {
    grid-template-columns: 1fr;
  }
}

/* ─── Component library page chrome ─── */
.fast-cl {
  padding-block: var(--space-12);
}

.fast-cl__header {
  margin-bottom: var(--space-16);
  padding-bottom: var(--space-8);
  border-bottom: 1px solid var(--color-border-subtle);
}

.fast-cl__section {
  margin-bottom: var(--space-24);
}

.fast-cl__section-title {
  margin-bottom: var(--space-2);
  font-size: var(--text-display-md);
}

.fast-cl__section-desc {
  margin-bottom: var(--space-8);
  max-width: 640px;
  font-size: var(--text-body-sm);
  color: var(--color-text-muted);
}

.fast-cl__preview {
  padding: var(--space-8);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-xl);
  background: var(--color-bg-raised);
}

.fast-cl__preview--dark {
  background: var(--color-bg-base);
}

.fast-cl__preview + .fast-cl__preview {
  margin-top: var(--space-4);
}

.fast-cl__label {
  display: block;
  margin-bottom: var(--space-4);
  font-size: var(--text-caption);
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-text-disabled);
}

.fast-cl__code {
  margin-top: var(--space-4);
  padding: var(--space-4);
  border-radius: var(--radius-md);
  background: var(--color-bg-surface);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-text-muted);
  overflow-x: auto;
}