/* ===== Root Variables ===== */
:root {
  /* Percentages of viewport height for anchor points */
  --panel-top-pc: 35;   /* Panel vertical position (25% down from top) */
  --reopen-top-pc: 25;  /* Reopen button position */

  /* Fallbacks (older browsers) */
  --panel-top:  calc(env(safe-area-inset-top, 0px) + var(--panel-top-pc) * 1vh);
  --reopen-top: calc(env(safe-area-inset-top, 0px) + var(--reopen-top-pc) * 1vh);

  /* Ensure the panel always stays above navbars, modals, etc. */
  --panel-z: 999999;
  --reopen-z: 999998;

  /* Close button sizing and offset */
  --close-size: 1.5rem;
  --close-offset: 0.35rem;
}

/* Modern viewport units for iOS Safari (fixes 100vh bug) */
@supports (height: 1svh) {
  :root {
    --panel-top:  calc(env(safe-area-inset-top, 0px) + var(--panel-top-pc) * 1svh);
    --reopen-top: calc(env(safe-area-inset-top, 0px) + var(--reopen-top-pc) * 1svh);
  }
}

/* ===== Floating Panel ===== */
.fixed-top-custom {
  position: fixed;
  top: var(--panel-top);
  right: 0;
  transform: translateY(-50%);
  z-index: var(--panel-z);

  display: flex;
  flex-direction: column;
  gap: 0.65rem;

  width: fit-content;
  padding: calc(0.9rem + var(--close-size) + var(--close-offset)) 1.4rem 1.25rem 1.4rem;

  background: rgba(0, 0, 0, 0.55);
  backdrop-filter: blur(6px);
  border-radius: 0.85rem 0 0 0.85rem;
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.4);
  color: #fff;

  transition: opacity 0.3s ease, transform 0.3s ease;
}

/* Panel Buttons */
.fixed-top-custom .btn {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 1rem;
  width: 100%;
  font-weight: 600;
  border: none;
  padding: 0.55rem 0.9rem;

  box-shadow: 0 3px 8px rgba(0, 0, 0, 0.25);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.fixed-top-custom .btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 5px 10px rgba(0, 0, 0, 0.35);
}

/* Close Button */
.close-btn {
  position: absolute;
  top: var(--close-offset);
  left: var(--close-offset);
  width: var(--close-size);
  height: var(--close-size);

  display: flex;
  align-items: center;
  justify-content: center;

  background-color: rgba(255, 255, 255, 0.15);
  color: #fff;
  border: none;
  border-radius: 50%;
  padding: 0.35rem;
  line-height: 1;
  font-size: 1.05rem;
  cursor: pointer;
  opacity: 0.9;
  transition: background-color 0.2s ease, transform 0.2s ease;
}
.close-btn:hover,
.close-btn:focus {
  background-color: rgba(255, 255, 255, 0.25);
  transform: scale(1.1);
  color: #f8d7da;
}

/* Fade-Out State */
.fixed-panel-fade-out {
  opacity: 0;
  transform: translateY(-50%) translateX(100%);
  pointer-events: none;
}

/* ===== Reopen Button ===== */
.reopen-btn {
  position: fixed;
  top: var(--reopen-top);
  right: 0;
  transform: translateY(-50%);
  z-index: var(--reopen-z);

  /* Darker background */
  background-color: rgba(0, 0, 0, 0.85);
  color: #fff;
  border: none;
  border-radius: 0.5rem 0 0 0.5rem;
  padding: 0.6rem 1rem;
  cursor: pointer;
  transition: opacity 0.3s ease, background-color 0.3s ease;
}

.reopen-btn:hover {
  opacity: 1;
  background-color: rgba(0, 0, 0, 0.95); /* nearly black on hover */
}


/* ===== Animation (slide-in + micro-bounce) ===== */
@keyframes panel-slide-in {
  0% {
    transform: translate(100%, -50%);
    opacity: 0;
  }
  60% {
    transform: translate(-2%, -50%);
    opacity: 1;
  }
  80% {
    transform: translate(1%, -50%);
  }
  100% {
    transform: translate(0, -50%);
  }
}
.fixed-top-custom.appear-animate {
  animation: panel-slide-in 480ms cubic-bezier(0.22, 0.61, 0.36, 1) both;
}

/* Reduced Motion Preference */
@media (prefers-reduced-motion: reduce) {
  @keyframes panel-fade-in {
    from { opacity: 0; }
    to { opacity: 1; }
  }
  .fixed-top-custom.appear-animate {
    animation: panel-fade-in 240ms ease-out both;
  }
}

/* ===== Mobile Adjustments ===== */
@media (max-width: 576px) {
  :root {
    --close-size: 1.6rem;
    --close-offset: 0.25rem;
  }

  .fixed-top-custom {
    right: 1rem;
    width: 210px;
    padding: calc(0.75rem + var(--close-size) + var(--close-offset)) 1.1rem 1rem 1.1rem;
    border-radius: 1rem;
    background-color: rgba(0, 0, 0, 0.8);
    gap: 0.55rem;
  }

  .fixed-top-custom .btn {
    font-size: 0.85rem;
    padding: 0.45rem 0.7rem;
  }

  .close-btn {
    font-size: 1.1rem;
    padding: 0.35rem 0.6rem;
  }

  .reopen-btn {
    right: 1rem;
    font-size: 0.9rem;
    padding: 0.5rem 0.9rem;
  }
}