/* =============================================================================
   Feature Cards — Numbered flip cards grid
   ============================================================================= */

.cb-fc {
  --cb-fc-bg: #ffffff;
  --cb-fc-headline: #111111;
  --cb-fc-desc: #374151;
  --cb-fc-divider: #e5e7eb;
  --cb-fc-divider-w: 1px;
  --cb-fc-prompt: #9ca3af;
  --cb-fc-card-bg: #f3f4f6;
  --cb-fc-card-back-bg: #1f2937;
  --cb-fc-card-front-text: #111111;
  --cb-fc-card-back-text: #ffffff;
  --cb-fc-card-num: #d1d5db;
  --cb-fc-accent: #dc2626;
  --cb-fc-cols: 4;
  --cb-fc-flip-speed: 600ms;
  --cb-fc-headline-size: 48px;
  --cb-fc-desc-size: 16px;
  --cb-fc-num-size: 64px;
  --cb-fc-front-title-size: 18px;
  --cb-fc-back-headline-size: 18px;
  --cb-fc-back-body-size: 14px;
  box-sizing: border-box;
  background: var(--cb-fc-bg);
  padding: clamp(3rem, 7vw, 5.5rem) 0;
  overflow: hidden;
}

.cb-fc *,
.cb-fc *::before,
.cb-fc *::after {
  box-sizing: inherit;
}

/* =============================================================================
   Inner wrap
   ============================================================================= */

.cb-fc__wrap {
  max-width: 80rem;
  margin: 0 auto;
  padding: 0 clamp(1.5rem, 5vw, 3rem);
}

/* =============================================================================
   Intro — headline left, description right (default)
   ============================================================================= */

.cb-fc__intro {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(1.5rem, 4vw, 3rem);
  align-items: end;
  margin-bottom: clamp(2rem, 4vw, 3rem);
}

.cb-fc__headline {
  margin: 0;
  font-size: clamp(2rem, 5vw, var(--cb-fc-headline-size));
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--cb-fc-headline);
}

.cb-fc__desc {
  margin: 0;
  font-size: clamp(0.9rem, 1.3vw, var(--cb-fc-desc-size));
  line-height: 1.6;
  color: var(--cb-fc-desc);
}

/* =============================================================================
   Intro alignment variants
   ============================================================================= */

/* Left (default) — two-column grid, no extra rules needed */

/* Center — single column, centered text */
.cb-fc--intro-align-center .cb-fc__intro {
  grid-template-columns: 1fr;
  text-align: center;
  max-width: 52rem;
  margin-left: auto;
  margin-right: auto;
}

.cb-fc--intro-align-center .cb-fc__desc {
  max-width: 42rem;
  margin-left: auto;
  margin-right: auto;
}

.cb-fc--intro-align-center .cb-fc__prompt {
  text-align: center;
}

/* Right — single column, right-aligned text */
.cb-fc--intro-align-right .cb-fc__intro {
  grid-template-columns: 1fr;
  text-align: right;
}

.cb-fc--intro-align-right .cb-fc__desc {
  margin-left: auto;
  margin-right: 0;
  max-width: 42rem;
}

.cb-fc--intro-align-right .cb-fc__prompt {
  text-align: right;
}

/* =============================================================================
   Card text alignment variants
   ============================================================================= */

/* Left (default) — no extra rules needed */

.cb-fc--card-align-left .cb-fc__face--front,
.cb-fc--card-align-left .cb-fc__face--back {
  text-align: left;
  align-items: flex-start;
}

.cb-fc--card-align-center .cb-fc__face--front,
.cb-fc--card-align-center .cb-fc__face--back {
  text-align: center;
  align-items: center;
}

.cb-fc--card-align-center .cb-fc__back-accent {
  margin-left: auto;
  margin-right: auto;
}

.cb-fc--card-align-center .cb-fc__learn-more {
  align-self: center;
}

.cb-fc--card-align-right .cb-fc__face--front,
.cb-fc--card-align-right .cb-fc__face--back {
  text-align: right;
  align-items: flex-end;
}

.cb-fc--card-align-right .cb-fc__back-accent {
  margin-left: auto;
  margin-right: 0;
}

.cb-fc--card-align-right .cb-fc__learn-more {
  align-self: flex-end;
}

/* =============================================================================
   Divider line
   ============================================================================= */

.cb-fc__divider {
  border: none;
  border-top: var(--cb-fc-divider-w) solid var(--cb-fc-divider);
  margin: 0 0 clamp(1rem, 2vw, 1.5rem);
}

/* =============================================================================
   Flip prompt
   ============================================================================= */

.cb-fc__prompt {
  margin: 0 0 clamp(1.25rem, 2vw, 2rem);
  font-size: clamp(0.75rem, 1vw, 0.875rem);
  color: var(--cb-fc-prompt);
  letter-spacing: 0.02em;
}

/* =============================================================================
   Card grid
   ============================================================================= */

.cb-fc__grid {
  display: grid;
  grid-template-columns: repeat(var(--cb-fc-cols), 1fr);
  gap: clamp(0.75rem, 1.5vw, 1.25rem);
}

/* =============================================================================
   Individual card flip container
   ============================================================================= */

.cb-fc__card-flip {
  perspective: 1200px;
  position: relative;
  min-height: clamp(280px, 32vw, 380px);
  outline: none;
  cursor: pointer;
}

.cb-fc__card-flip:focus-visible {
  outline: 2px solid var(--cb-fc-accent);
  outline-offset: 3px;
}

.cb-fc__card-inner {
  position: relative;
  width: 100%;
  height: 100%;
  min-height: inherit;
  transform-style: preserve-3d;
  transition: transform var(--cb-fc-flip-speed) cubic-bezier(0.4, 0.2, 0.2, 1);
}

/* Flip states — horizontal */
.cb-fc--flip-horizontal .cb-fc__card-flip.is-flipped .cb-fc__card-inner {
  transform: rotateY(180deg);
}

@media (hover: hover) and (pointer: fine) {
  .cb-fc--flip-horizontal .cb-fc__card-flip:hover .cb-fc__card-inner {
    transform: rotateY(180deg);
  }
}

/* Flip states — vertical */
.cb-fc--flip-vertical .cb-fc__card-flip.is-flipped .cb-fc__card-inner {
  transform: rotateX(180deg);
}

@media (hover: hover) and (pointer: fine) {
  .cb-fc--flip-vertical .cb-fc__card-flip:hover .cb-fc__card-inner {
    transform: rotateX(180deg);
  }
}

/* =============================================================================
   Card faces
   ============================================================================= */

.cb-fc__face {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  overflow: hidden;
}

/* =============================================================================
   Card corner styles
   ============================================================================= */

/* Hard (square) corners */
.cb-fc--corner-hard .cb-fc__face { border-radius: 0; }

/* Rounded — five sizes (Tailwind-inspired scale) */
.cb-fc--corner-rounded-xs .cb-fc__face { border-radius: 4px; }
.cb-fc--corner-rounded-sm .cb-fc__face { border-radius: 8px; }
.cb-fc--corner-rounded-md .cb-fc__face { border-radius: 12px; }
.cb-fc--corner-rounded-lg .cb-fc__face { border-radius: 16px; }
.cb-fc--corner-rounded-xl .cb-fc__face { border-radius: 24px; }

/* Chip — diagonal cut on one corner, the other three rounded at 12 px.
   clip-path is applied on the flip container (above the preserve-3d context)
   so it works correctly with 3D transforms. */
.cb-fc--corner-chip-tl .cb-fc__face { border-radius: 0 12px 12px 12px; }
.cb-fc--corner-chip-tr .cb-fc__face { border-radius: 12px 0 12px 12px; }
.cb-fc--corner-chip-br .cb-fc__face { border-radius: 12px 12px 0 12px; }
.cb-fc--corner-chip-bl .cb-fc__face { border-radius: 12px 12px 12px 0; }

.cb-fc--corner-chip-tl .cb-fc__card-flip {
  clip-path: polygon(28px 0, 100% 0, 100% 100%, 0 100%, 0 28px);
}
.cb-fc--corner-chip-tr .cb-fc__card-flip {
  clip-path: polygon(0 0, calc(100% - 28px) 0, 100% 28px, 100% 100%, 0 100%);
}
.cb-fc--corner-chip-br .cb-fc__card-flip {
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 28px), calc(100% - 28px) 100%, 0 100%);
}
.cb-fc--corner-chip-bl .cb-fc__card-flip {
  clip-path: polygon(0 0, 100% 0, 100% 100%, 28px 100%, 0 calc(100% - 28px));
}

.cb-fc__face--front {
  background: var(--cb-fc-card-bg);
  color: var(--cb-fc-card-front-text);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: clamp(1.5rem, 2.5vw, 2.25rem);
}

.cb-fc__face--back {
  background: var(--cb-fc-card-back-bg);
  color: var(--cb-fc-card-back-text);
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: clamp(1.5rem, 2.5vw, 2.25rem);
  pointer-events: none;
}

/* Horizontal flip back */
.cb-fc--flip-horizontal .cb-fc__face--back {
  transform: rotateY(180deg);
}

/* Vertical flip back */
.cb-fc--flip-vertical .cb-fc__face--back {
  transform: rotateX(180deg);
}

.cb-fc__card-flip.is-flipped .cb-fc__face--back  { pointer-events: auto; }
.cb-fc__card-flip.is-flipped .cb-fc__face--front { pointer-events: none; }

@media (hover: hover) and (pointer: fine) {
  .cb-fc__card-flip:hover .cb-fc__face--back  { pointer-events: auto; }
  .cb-fc__card-flip:hover .cb-fc__face--front { pointer-events: none; }
}

/* =============================================================================
   Front face content
   ============================================================================= */

.cb-fc__number {
  margin: 0;
  font-size: clamp(2.5rem, 5vw, var(--cb-fc-num-size));
  font-weight: 800;
  line-height: 1;
  color: var(--cb-fc-card-num);
  letter-spacing: -0.02em;
}

.cb-fc__front-title {
  margin: 0;
  font-size: clamp(1rem, 1.5vw, var(--cb-fc-front-title-size));
  font-weight: 700;
  line-height: 1.35;
  color: var(--cb-fc-card-front-text);
}

.cb-fc__front-micro {
  margin: 0.5rem 0 0;
  font-size: 0.75rem;
  color: var(--cb-fc-prompt);
  letter-spacing: 0.02em;
}

/* =============================================================================
   Back face content
   ============================================================================= */

.cb-fc__back-accent {
  display: block;
  width: 2rem;
  height: 3px;
  background: var(--cb-fc-accent);
  margin-bottom: 1rem;
  border-radius: 2px;
}

.cb-fc__back-headline {
  margin: 0 0 0.65rem;
  font-size: clamp(1rem, 1.5vw, var(--cb-fc-back-headline-size));
  font-weight: 700;
  line-height: 1.3;
}

.cb-fc__back-body {
  margin: 0;
  font-size: clamp(0.8rem, 1.1vw, var(--cb-fc-back-body-size));
  line-height: 1.55;
  opacity: 0.88;
}

/* =============================================================================
   Learn More link variants
   ============================================================================= */

.cb-fc__learn-more {
  display: inline-flex;
  align-items: center;
  margin-top: 1rem;
  font-size: 0.875rem;
  font-weight: 600;
  text-decoration: none;
  color: var(--cb-fc-learn-more, var(--cb-fc-accent));
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.cb-fc__learn-more:hover {
  opacity: 0.8;
}

/* underline */
.cb-fc__learn-more--underline {
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* pill */
.cb-fc__learn-more--pill {
  padding: 0.4rem 1rem;
  border-radius: 999px;
  background: var(--cb-fc-learn-more, var(--cb-fc-accent));
  color: #fff;
  text-decoration: none;
}

.cb-fc__learn-more--pill:hover {
  transform: translateY(-1px);
}

/* arrow */
.cb-fc__learn-more--arrow::after {
  content: ' →';
  margin-left: 0.25rem;
  transition: margin-left 0.2s ease;
}

.cb-fc__learn-more--arrow:hover::after {
  margin-left: 0.5rem;
}

/* =============================================================================
   Entrance animations
   ============================================================================= */

/* Shared transition on cards */
.cb-fc__card-flip {
  transition:
    opacity   0.55s cubic-bezier(0.22, 1, 0.36, 1),
    transform 0.6s  cubic-bezier(0.22, 1, 0.36, 1);
}

/* --- stagger-up --- */
.cb-fc--anim-stagger-up:not(.cb-fc--visible) .cb-fc__card-flip {
  opacity: 0;
  transform: translateY(2.5rem);
}
.cb-fc--anim-stagger-up.cb-fc--visible .cb-fc__card-flip {
  opacity: 1;
  transform: none;
}

/* --- stagger-scale --- */
.cb-fc--anim-stagger-scale:not(.cb-fc--visible) .cb-fc__card-flip {
  opacity: 0;
  transform: scale(0.85);
}
.cb-fc--anim-stagger-scale.cb-fc--visible .cb-fc__card-flip {
  opacity: 1;
  transform: none;
}

/* --- fade-in --- */
.cb-fc--anim-fade-in:not(.cb-fc--visible) .cb-fc__card-flip {
  opacity: 0;
}
.cb-fc--anim-fade-in.cb-fc--visible .cb-fc__card-flip {
  opacity: 1;
}

/* --- slide-left --- */
.cb-fc--anim-slide-left:not(.cb-fc--visible) .cb-fc__card-flip {
  opacity: 0;
  transform: translateX(-2rem);
}
.cb-fc--anim-slide-left.cb-fc--visible .cb-fc__card-flip {
  opacity: 1;
  transform: none;
}

/* --- slide-right --- */
.cb-fc--anim-slide-right:not(.cb-fc--visible) .cb-fc__card-flip {
  opacity: 0;
  transform: translateX(2rem);
}
.cb-fc--anim-slide-right.cb-fc--visible .cb-fc__card-flip {
  opacity: 1;
  transform: none;
}

/* --- flip-in --- */
.cb-fc--anim-flip-in:not(.cb-fc--visible) .cb-fc__card-flip {
  opacity: 0;
  transform: perspective(600px) rotateX(-20deg);
}
.cb-fc--anim-flip-in.cb-fc--visible .cb-fc__card-flip {
  opacity: 1;
  transform: none;
}

/* Stagger delays — applied on cards inside the grid */
.cb-fc--visible .cb-fc__card-flip:nth-child(1) { transition-delay: 0s; }
.cb-fc--visible .cb-fc__card-flip:nth-child(2) { transition-delay: 0.08s; }
.cb-fc--visible .cb-fc__card-flip:nth-child(3) { transition-delay: 0.16s; }
.cb-fc--visible .cb-fc__card-flip:nth-child(4) { transition-delay: 0.24s; }
.cb-fc--visible .cb-fc__card-flip:nth-child(5) { transition-delay: 0.32s; }
.cb-fc--visible .cb-fc__card-flip:nth-child(6) { transition-delay: 0.40s; }
.cb-fc--visible .cb-fc__card-flip:nth-child(7) { transition-delay: 0.48s; }
.cb-fc--visible .cb-fc__card-flip:nth-child(8) { transition-delay: 0.56s; }

/* Intro elements entrance */
.cb-fc__headline,
.cb-fc__desc,
.cb-fc__divider,
.cb-fc__prompt {
  transition:
    opacity   0.5s cubic-bezier(0.22, 1, 0.36, 1),
    transform 0.5s cubic-bezier(0.22, 1, 0.36, 1);
}

.cb-fc:not(.cb-fc--visible) .cb-fc__headline,
.cb-fc:not(.cb-fc--visible) .cb-fc__desc {
  opacity: 0;
  transform: translateY(0.8rem);
}

.cb-fc:not(.cb-fc--visible) .cb-fc__divider,
.cb-fc:not(.cb-fc--visible) .cb-fc__prompt {
  opacity: 0;
}

.cb-fc--visible .cb-fc__headline { transition-delay: 0s; }
.cb-fc--visible .cb-fc__desc     { transition-delay: 0.06s; }
.cb-fc--visible .cb-fc__divider  { transition-delay: 0.12s; }
.cb-fc--visible .cb-fc__prompt   { transition-delay: 0.16s; }

.cb-fc--visible .cb-fc__headline,
.cb-fc--visible .cb-fc__desc,
.cb-fc--visible .cb-fc__divider,
.cb-fc--visible .cb-fc__prompt {
  opacity: 1;
  transform: none;
}

/* =============================================================================
   Reduced motion
   ============================================================================= */

@media (prefers-reduced-motion: reduce) {
  .cb-fc__card-flip,
  .cb-fc__card-inner,
  .cb-fc__headline,
  .cb-fc__desc,
  .cb-fc__divider,
  .cb-fc__prompt,
  .cb-fc__learn-more {
    transition: none !important;
    animation: none !important;
  }

  .cb-fc__card-flip {
    perspective: none;
  }

  .cb-fc__card-inner {
    transform: none !important;
    display: flex;
    flex-direction: column;
    min-height: 0;
  }

  .cb-fc__face {
    position: relative !important;
    inset: auto !important;
    transform: none !important;
    backface-visibility: visible !important;
    -webkit-backface-visibility: visible !important;
    pointer-events: auto !important;
  }

  .cb-fc__face--back {
    margin-top: 0.75rem;
  }

  .cb-fc:not(.cb-fc--visible) .cb-fc__card-flip,
  .cb-fc:not(.cb-fc--visible) .cb-fc__headline,
  .cb-fc:not(.cb-fc--visible) .cb-fc__desc,
  .cb-fc:not(.cb-fc--visible) .cb-fc__divider,
  .cb-fc:not(.cb-fc--visible) .cb-fc__prompt {
    opacity: 1 !important;
    transform: none !important;
  }
}

/* =============================================================================
   Responsive
   ============================================================================= */

@media (max-width: 64rem) {
  .cb-fc__grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .cb-fc__intro {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 40rem) {
  .cb-fc__grid {
    grid-template-columns: 1fr;
  }

  .cb-fc__card-flip {
    min-height: 260px;
  }
}