/* ==========================================================================
   GLASS FOLDER CARDS — Modern Frosted 3-Layer Interactive Component
   Design System Tokens compliant (css/tokens.css & css/tokens-neutral.css)
   Vanilla CSS — No external dependencies
   ========================================================================== */

.gf-root {
  --gf-px: 0;
  --gf-py: 0;
  --gf-ease: var(--ease-out, cubic-bezier(.22, 1, .36, 1));
  --gf-spring: cubic-bezier(.34, 1.36, .5, 1);
  --gf-hinge: 0deg;
  --gf-lift: 42px;
  --gf-spread: 0px;
  --gf-fan: 0deg;
  --gf-stack: 15px;
  --gf-ink: var(--color-text, #18181B);
  --gf-ink-soft: var(--color-muted, #71717A);
  --gf-k: 1;
  position: relative;
  display: block;
  width: 100%;
  max-width: 380px;
  margin: 0 auto;
  font-family: var(--font-ui, 'Inter', -apple-system, sans-serif);
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
  isolation: isolate;
  user-select: none;
}

/* Modo oscuro: vidrio ahumado (smoked glass) */
.gf-root[data-tone="dark"],
html[data-theme="dark"] .gf-root {
  --gf-ink: var(--color-text, #F4F4F5);
  --gf-ink-soft: var(--color-muted, #A1A1AA);
}

/* Hover & Focus: panel frontal inclina hacia adelante (~-11deg) y hojas suben */
.gf-root:hover,
.gf-root:focus-within {
  --gf-hinge: -11deg;
  --gf-lift: -34px;
  --gf-spread: 8px;
  --gf-fan: 1.4deg;
  --gf-stack: 10px;
}

/* Abierto (Click / Enter / Espacio): panel cae (~-24deg) y abanico completo */
.gf-root[data-open] {
  --gf-hinge: -24deg;
  --gf-lift: -96px;
  --gf-spread: 40px;
  --gf-fan: 5deg;
  --gf-stack: 30px;
}

/* Stage: base 340x272 con headroom de 54px escalado proporcionalmente */
.gf-stage {
  position: absolute;
  left: 50%;
  top: 0;
  width: 340px;
  height: 272px;
  transform-origin: 50% 0;
  transform: translateX(-50%) translateY(calc(54px * var(--gf-k, 1))) scale(var(--gf-k, 1));
}

.gf-tilt {
  position: absolute;
  inset: 0;
  transform: perspective(1400px) rotateX(calc(var(--gf-py) * -3deg)) rotateY(calc(var(--gf-px) * 4deg));
  transition: transform .9s var(--gf-ease);
}

/* Sombra suave inferior de la carpeta */
.gf-shadow {
  position: absolute;
  left: 18px;
  right: 18px;
  bottom: -6px;
  height: 60px;
  border-radius: 40px;
  background: rgba(24, 24, 27, .18);
  filter: blur(22px);
  transform: translateX(calc(var(--gf-px) * -8px));
  transition: transform .9s var(--gf-ease), opacity .9s var(--gf-ease);
}

.gf-root[data-tone="dark"] .gf-shadow,
html[data-theme="dark"] .gf-root .gf-shadow {
  background: rgba(0, 0, 0, .62);
}

/* 1. Panel trasero (Back) */
.gf-back {
  position: absolute;
  inset: 0;
  overflow: hidden;
  background: linear-gradient(180deg, var(--gray-50, #F7F7F8) 0%, var(--gray-200, #E4E4E7) 100%);
  border-radius: var(--radius-lg, 16px);
}

.gf-root[data-tone="dark"] .gf-back,
html[data-theme="dark"] .gf-root .gf-back {
  background: linear-gradient(180deg, #27272A 0%, #18181B 100%);
}

.gf-art {
  position: absolute;
  left: -12px;
  top: -12px;
  max-width: none;
  object-fit: cover;
  transform: translate(calc(var(--gf-px) * -7px), calc(var(--gf-py) * -6px)) scale(1.02);
  transition: transform 1.1s var(--gf-ease), opacity 1.2s var(--gf-ease), filter 1.2s var(--gf-ease);
}

canvas.gf-art {
  opacity: 0;
  filter: blur(14px) saturate(.6);
}

canvas.gf-art[data-ready] {
  opacity: 1;
  filter: none;
}

.gf-back-sheen {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, .28) 0%, rgba(255, 255, 255, 0) 24%),
    radial-gradient(120% 80% at 80% 0%, rgba(255, 255, 255, .18), rgba(255, 255, 255, 0) 60%);
  pointer-events: none;
}

html[data-theme="dark"] .gf-back-sheen {
  background:
    linear-gradient(180deg, rgba(255, 255, 255, .12) 0%, rgba(255, 255, 255, 0) 24%),
    radial-gradient(120% 80% at 80% 0%, rgba(255, 255, 255, .08), rgba(255, 255, 255, 0) 60%);
}

.gf-rim {
  position: absolute;
  left: 0;
  top: 0;
  max-width: none;
  overflow: visible;
  pointer-events: none;
  fill: none;
}

.gf-back-rim {
  width: 340px;
  height: 272px;
}

.gf-back-rim path {
  stroke: rgba(255, 255, 255, .55);
  stroke-width: 1;
}

.gf-root[data-tone="dark"] .gf-back-rim path,
html[data-theme="dark"] .gf-root .gf-back-rim path {
  stroke: rgba(255, 255, 255, .18);
}

/* 2. Capa intermedia: Archivos / Hojas */
.gf-files {
  position: absolute;
  inset: 0;
  z-index: 5;
  pointer-events: none;
  clip-path: inset(-400px -400px 10px -400px);
}

.gf-sheet-slot {
  display: contents;
}

.gf-sheet {
  all: unset;
  box-sizing: border-box;
  position: absolute;
  left: 34px;
  top: 96px;
  width: 272px;
  height: 184px;
  border-radius: var(--radius-lg, 16px);
  overflow: hidden;
  cursor: pointer;
  pointer-events: auto;
  background: linear-gradient(180deg, #FFFFFF 0%, var(--gray-100, #F3F4F6) 100%);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, .9),
    0 0 0 1px var(--color-border, #E4E4E7),
    var(--shadow-hover);
  transform-origin: 50% 100%;
  transform:
    translate(calc(var(--gf-jx) + var(--gf-slot) * var(--gf-spread)), calc(var(--gf-lift) + var(--gf-depth) * var(--gf-stack) * -1))
    rotate(calc(var(--gf-jr) + var(--gf-slot) * var(--gf-fan)));
  transition:
    transform .75s var(--gf-spring) calc(var(--gf-depth) * 40ms),
    box-shadow .4s var(--gf-ease),
    translate .9s var(--gf-ease),
    opacity .9s var(--gf-ease);
}

.gf-root[data-tone="dark"] .gf-sheet,
html[data-theme="dark"] .gf-root .gf-sheet {
  background: linear-gradient(180deg, #27272A 0%, #18181B 100%);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, .14),
    0 0 0 1px var(--color-border, #3F3F46),
    0 12px 28px -8px rgba(0, 0, 0, .7);
}

.gf-sheet--art {
  background: #18181B;
}

.gf-root[data-open] .gf-sheet:hover,
.gf-root[data-open] .gf-sheet:focus-visible {
  transform:
    translate(calc(var(--gf-jx) + var(--gf-slot) * var(--gf-spread)), calc(var(--gf-lift) + var(--gf-depth) * var(--gf-stack) * -1 - 18px))
    rotate(calc(var(--gf-slot) * var(--gf-fan) * .6));
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, .95),
    0 0 0 1px var(--color-accent),
    0 22px 40px -12px rgba(10, 12, 20, .42);
  transition-delay: 0s;
}

.gf-sheet:focus-visible {
  outline: 2px solid var(--color-accent) !important;
  outline-offset: 2px;
}

.gf-sheet-art {
  position: absolute;
  left: 0;
  top: 0;
  width: 272px;
  height: 184px;
  max-width: none;
  object-fit: cover;
  transition: opacity .9s var(--gf-ease), filter .9s var(--gf-ease);
}

canvas.gf-sheet-art {
  opacity: 0;
  filter: blur(10px);
}

canvas.gf-sheet-art[data-ready] {
  opacity: 1;
  filter: none;
}

.gf-sheet--art::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: linear-gradient(180deg, rgba(0, 0, 0, .48) 0%, rgba(0, 0, 0, 0) 36%);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, .2);
  pointer-events: none;
}

.gf-sheet-head {
  position: absolute;
  left: 14px;
  right: 14px;
  top: 11px;
  z-index: 1;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  white-space: nowrap;
}

.gf-sheet-name {
  overflow: hidden;
  text-overflow: ellipsis;
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: -.01em;
  color: var(--color-text, #18181B);
}

.gf-sheet-meta {
  flex: none;
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 10px;
  letter-spacing: .02em;
  color: var(--color-muted, #71717A);
}

.gf-root[data-tone="dark"] .gf-sheet-name,
html[data-theme="dark"] .gf-root .gf-sheet-name,
.gf-sheet--art .gf-sheet-name {
  color: #FAFAFA;
}

.gf-root[data-tone="dark"] .gf-sheet-meta,
html[data-theme="dark"] .gf-root .gf-sheet-meta,
.gf-sheet--art .gf-sheet-meta {
  color: rgba(250, 250, 250, .75);
}

.gf-lines {
  position: absolute;
  left: 14px;
  right: 14px;
  top: 40px;
  display: flex;
  flex-direction: column;
  gap: 9px;
}

.gf-lines i {
  display: block;
  height: 5px;
  border-radius: 3px;
  background: rgba(24, 24, 27, .08);
}

.gf-lines i:first-child {
  height: 9px;
  margin-bottom: 4px;
  background: rgba(24, 24, 27, .15);
}

.gf-root[data-tone="dark"] .gf-lines i,
html[data-theme="dark"] .gf-root .gf-lines i {
  background: rgba(255, 255, 255, .08);
}

.gf-root[data-tone="dark"] .gf-lines i:first-child,
html[data-theme="dark"] .gf-root .gf-lines i:first-child {
  background: rgba(255, 255, 255, .16);
}

/* 3. Panel frontal de vidrio esmerilado (Front Glass) */
.gf-front {
  position: absolute;
  left: 0;
  top: 74px;
  width: 340px;
  height: 198px;
  z-index: 10;
  -webkit-backdrop-filter: blur(24px) saturate(1.5);
  backdrop-filter: blur(24px) saturate(1.5);
  transform-origin: 50% 100%;
  transform: perspective(760px) rotateX(var(--gf-hinge));
  transition: transform .8s var(--gf-spring), translate 1s var(--gf-ease), opacity 1s var(--gf-ease);
}

.gf-tint {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, .20) 0%, rgba(255, 255, 255, .55) 42%, rgba(250, 250, 250, .94) 100%);
}

.gf-root[data-tone="dark"] .gf-tint,
html[data-theme="dark"] .gf-root .gf-tint {
  background: linear-gradient(180deg, rgba(24, 24, 27, .22) 0%, rgba(24, 24, 27, .65) 46%, rgba(18, 18, 20, .95) 100%);
}

.gf-spec {
  position: absolute;
  inset: 0;
  background: radial-gradient(260px 200px at calc(50% + var(--gf-px) * 46%) calc(30% + var(--gf-py) * 40%), rgba(255, 255, 255, .55), rgba(255, 255, 255, 0) 70%);
  mix-blend-mode: soft-light;
  opacity: .9;
  transition: background-position .6s var(--gf-ease);
  pointer-events: none;
}

.gf-root[data-tone="dark"] .gf-spec,
html[data-theme="dark"] .gf-root .gf-spec {
  mix-blend-mode: screen;
  opacity: .22;
}

.gf-front-rim {
  width: 340px;
  height: 198px;
}

.gf-front-rim path {
  stroke-width: 2.4;
  transition: stroke-width .3s var(--gf-ease);
}

.gf-root[data-tone="dark"] .gf-front-rim,
html[data-theme="dark"] .gf-root .gf-front-rim {
  opacity: .6;
}

/* Hit button: activa la carpeta completa */
.gf-hit {
  all: unset;
  position: absolute;
  inset: 0;
  z-index: 1;
  cursor: pointer;
}

.gf-hit:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: -2px;
  border-radius: var(--radius-lg, 16px);
}

.gf-hit:focus-visible ~ .gf-label .gf-title {
  text-decoration: underline;
  text-decoration-thickness: 1.5px;
  text-underline-offset: 4px;
}

.gf-label {
  position: absolute;
  z-index: 2;
  display: flex;
  flex-direction: column;
  gap: 4px;
  left: 28px;
  bottom: 28px;
  max-width: 220px;
  pointer-events: none;
  color: var(--gf-ink);
}

.gf-title {
  font-size: 17px;
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -.015em;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.gf-meta {
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 11.5px;
  letter-spacing: .03em;
  color: var(--gf-ink-soft);
  white-space: nowrap;
}

/* 4. Entrada: ensamble progresivo de la carpeta en el viewport */
.gf-root:not([data-entered]) .gf-back,
.gf-root:not([data-entered]) .gf-back-rim {
  translate: 0 22px;
  opacity: 0;
}

.gf-root:not([data-entered]) .gf-sheet {
  translate: 0 -120px;
  opacity: 0;
}

.gf-root:not([data-entered]) .gf-front {
  translate: 0 46px;
  opacity: 0;
}

.gf-root:not([data-entered]) .gf-shadow {
  opacity: 0;
}

.gf-back,
.gf-back-rim {
  transition: translate 1s var(--gf-ease), opacity .9s var(--gf-ease);
}

.gf-root[data-entered] .gf-sheet {
  transition-delay: calc(var(--gf-depth) * 40ms), 0s, calc(.18s + var(--gf-depth) * 90ms), calc(.18s + var(--gf-depth) * 90ms);
}

.gf-root[data-entered] .gf-front {
  transition-delay: 0s, .42s, .42s;
}

/* Prefers-reduced-motion: sin animaciones ni tilt 3D */
@media (prefers-reduced-motion: reduce) {
  .gf-root *,
  .gf-root *::before,
  .gf-root *::after {
    transition-duration: 0.01ms !important;
    transition-delay: 0s !important;
    animation: none !important;
  }
  .gf-tilt {
    transform: none !important;
  }
}