:root{
  --bg: #0a0f1c;
  --fg: #f1f5f9;
  --muted: #94a3b8;
  --accent: #3b82f6;
  --accent-hover: #2563eb;

  --overlay-bg: rgba(10, 15, 28, 0.95);
  --panel-bg: linear-gradient(145deg, #0f172a 0%, #1e293b 100%);
  --panel-border: rgba(71, 85, 105, 0.3);

  --btn-bg: rgba(30, 41, 59, 0.8);
  --btn-bg-hover: rgba(51, 65, 85, 0.9);
  --btn-border: rgba(71, 85, 105, 0.4);
  --ring: 0 0 0 3px rgba(59, 130, 246, 0.4);
  
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

/* Fullscreen overlay */
.app-overlay{
  position: fixed;
  inset: 0;
  display: none;
  place-items: center;
  background: var(--overlay-bg);
  backdrop-filter: blur(12px);
  z-index: 2147483647;
  animation: overlay-fade-in 0.3s ease-out;
}
.app-overlay.open{ display: grid; }

@keyframes overlay-fade-in {
  from { 
    opacity: 0; 
    backdrop-filter: blur(0px);
  }
  to { 
    opacity: 1; 
    backdrop-filter: blur(12px);
  }
}

/* Dialog panel with modern glassmorphism effect */
.app-dialog{
  width: min(95vw, 900px);
  height: min(90vh, 700px);
  background: var(--panel-bg);
  border: 1px solid var(--panel-border);
  border-radius: 1rem;
  display: grid;
  grid-template-rows: auto 1fr auto;
  overflow: hidden;
  color: var(--fg);
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Inter, "Helvetica Neue", Arial;
  box-shadow: var(--shadow-xl);
  backdrop-filter: blur(20px);
  animation: dialog-slide-in 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

@keyframes dialog-slide-in {
  from {
    opacity: 0;
    transform: scale(0.9) translateY(20px);
  }
  to {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
}

/* Header with gradient and better spacing */
.app-dialog__header{
  display: flex; 
  align-items: center; 
  justify-content: space-between;
  padding: 1.25rem 1.5rem;
  background: linear-gradient(135deg, rgba(30, 41, 59, 0.8) 0%, rgba(15, 23, 42, 0.8) 100%);
  border-bottom: 1px solid var(--panel-border);
  backdrop-filter: blur(10px);
}

.app-dialog__title{ 
  font-size: 1.125rem; 
  font-weight: 700; 
  letter-spacing: -0.025em;
  background: linear-gradient(135deg, var(--fg), var(--muted));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.app-dialog__close{
  border: 1px solid var(--btn-border);
  background: var(--btn-bg);
  color: var(--fg);
  border-radius: 0.75rem;
  padding: 0.5rem 0.75rem;
  cursor: pointer;
  font-weight: 600;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-sm);
}

.app-dialog__close:hover{ 
  background: var(--btn-bg-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.app-dialog__close:focus-visible{ 
  outline: none; 
  box-shadow: var(--ring);
  transform: translateY(-1px);
}

/* Body content with better scrolling */
.app-dialog__body{ 
  padding: 1.5rem; 
  overflow: auto;
  background: rgba(15, 23, 42, 0.3);
  scrollbar-width: thin;
  scrollbar-color: var(--muted) transparent;
}

.app-dialog__body::-webkit-scrollbar {
  width: 6px;
}

.app-dialog__body::-webkit-scrollbar-track {
  background: transparent;
}

.app-dialog__body::-webkit-scrollbar-thumb {
  background: var(--muted);
  border-radius: 3px;
}

.app-dialog__body::-webkit-scrollbar-thumb:hover {
  background: var(--fg);
}

.app-slide{ 
  display: none; 
}

.app-slide.is-active{ 
  display: block; 
  animation: app-fade 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Footer with modern button styling */
.app-dialog__footer{
  display: flex; 
  align-items: center; 
  justify-content: space-between;
  padding: 1.25rem 1.5rem;
  background: linear-gradient(135deg, rgba(30, 41, 59, 0.8) 0%, rgba(15, 23, 42, 0.8) 100%);
  border-top: 1px solid var(--panel-border);
  backdrop-filter: blur(10px);
}

.app-navbtn{
  border: 1px solid var(--btn-border);
  background: var(--btn-bg);
  color: var(--fg);
  border-radius: 0.75rem;
  padding: 0.75rem 1.25rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-sm);
  font-size: 0.9rem;
}

.app-navbtn:hover{ 
  background: var(--btn-bg-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.app-navbtn:focus-visible{ 
  outline: none; 
  box-shadow: var(--ring);
  transform: translateY(-1px);
}

.app-navbtn:active {
  transform: translateY(0);
  box-shadow: var(--shadow-sm);
}

.app-index{ 
  color: var(--muted); 
  font-size: 0.95rem;
  font-weight: 500;
  padding: 0.5rem 1rem;
  background: rgba(30, 41, 59, 0.5);
  border-radius: 0.5rem;
  border: 1px solid var(--panel-border);
}

@keyframes app-fade{ 
  from {
    opacity: 0; 
    transform: translateY(8px) scale(0.98);
  } 
  to {
    opacity: 1; 
    transform: translateY(0) scale(1);
  } 
}

/* Mobile responsive improvements */
@media (max-width: 768px) {
  .app-dialog {
    width: 100vw;
    height: 100vh;
    border-radius: 0;
    animation: dialog-slide-up 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
  }
  
  @keyframes dialog-slide-up {
    from {
      transform: translateY(100%);
    }
    to {
      transform: translateY(0);
    }
  }
}

@media (max-width: 640px) {
  .app-dialog__header,
  .app-dialog__footer {
    padding: 1rem;
  }
  
  .app-dialog__body {
    padding: 1rem;
  }
  
  .app-dialog__title {
    font-size: 1rem;
  }
  
  .app-navbtn {
    padding: 0.625rem 1rem;
    font-size: 0.85rem;
  }
  
  .app-index {
    font-size: 0.875rem;
    padding: 0.375rem 0.75rem;
  }
}

@media (max-width: 480px) {
  .app-dialog__header,
  .app-dialog__footer {
    padding: 0.875rem;
  }
  
  .app-dialog__body {
    padding: 0.875rem;
  }
  
  .app-navbtn {
    padding: 0.5rem 0.875rem;
    font-size: 0.8rem;
  }
  
  .app-dialog__close {
    padding: 0.375rem 0.625rem;
    font-size: 0.875rem;
  }
}