/* Canvas Notes - Custom iOS / iPad & Desktop Styles */
:root {
  --canvas-red: #E53935;
  --canvas-red-dark: #C62828;
}

html {
  margin: 0;
  padding: 0;
  height: 100%;
  height: -webkit-fill-available;
  background-color: #020617;
}

body {
  margin: 0;
  padding: 0;
  min-height: 100%;
  min-height: 100vh;
  min-height: 100dvh;
  min-height: -webkit-fill-available;
  height: 100%;
  height: 100dvh;
  overscroll-behavior-y: none;
  -webkit-tap-highlight-color: transparent;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background-color: #020617;
}

/* Safe area insets for iOS / iPad notch, Dynamic Island, and home bar */
.safe-top, .safe-pt {
  padding-top: env(safe-area-inset-top, 0px);
}
.safe-bottom, .safe-pb {
  padding-bottom: env(safe-area-inset-bottom, 0px);
}
.safe-left, .safe-pl {
  padding-left: env(safe-area-inset-left, 0px);
}
.safe-right, .safe-pr {
  padding-right: env(safe-area-inset-right, 0px);
}
.safe-area-all {
  padding-top: env(safe-area-inset-top, 0px);
  padding-bottom: env(safe-area-inset-bottom, 0px);
  padding-left: env(safe-area-inset-left, 0px);
  padding-right: env(safe-area-inset-right, 0px);
}

/* PWA Standalone Header & Navigation: guarantees top bar is never cropped */
.pwa-header {
  padding-top: env(safe-area-inset-top, 0px);
  padding-left: max(1rem, env(safe-area-inset-left, 0px));
  padding-right: max(1rem, env(safe-area-inset-right, 0px));
  height: calc(4rem + env(safe-area-inset-top, 0px));
  min-height: calc(4rem + env(safe-area-inset-top, 0px));
  box-sizing: border-box;
}

.pwa-viewer-header {
  padding-top: env(safe-area-inset-top, 0px);
  padding-left: max(0.5rem, env(safe-area-inset-left, 0px));
  padding-right: max(0.5rem, env(safe-area-inset-right, 0px));
  height: calc(3.5rem + env(safe-area-inset-top, 0px));
  min-height: calc(3.5rem + env(safe-area-inset-top, 0px));
  box-sizing: border-box;
}
@media (min-width: 640px) {
  .pwa-viewer-header {
    height: calc(4rem + env(safe-area-inset-top, 0px));
    min-height: calc(4rem + env(safe-area-inset-top, 0px));
  }
}

.pwa-sidebar {
  padding-top: env(safe-area-inset-top, 0px);
  padding-bottom: env(safe-area-inset-bottom, 0px);
  padding-left: env(safe-area-inset-left, 0px);
  box-sizing: border-box;
}

.pwa-footer {
  padding-bottom: env(safe-area-inset-bottom, 0px);
  padding-left: max(1rem, env(safe-area-inset-left, 0px));
  padding-right: max(1rem, env(safe-area-inset-right, 0px));
  height: calc(2.5rem + env(safe-area-inset-bottom, 0px));
  min-height: calc(2.5rem + env(safe-area-inset-bottom, 0px));
  box-sizing: border-box;
}

/* Annotation Canvas Container & Layering */
.viewport-container {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  min-height: 100%;
  padding: 24px;
  box-sizing: border-box;
}

.document-page-wrapper {
  position: relative;
  box-shadow: 0 10px 30px -5px rgba(0, 0, 0, 0.2), 0 4px 12px -2px rgba(0, 0, 0, 0.1);
  background-color: #ffffff;
  border-radius: 4px;
  overflow: hidden;
  user-select: none;
  -webkit-user-select: none;
  flex-shrink: 0;
  min-width: max-content;
  transform-origin: 0 0;
  -webkit-transform: translateZ(0);
  transform: translateZ(0);
  isolation: isolate;
  contain: layout paint;
}

#viewport-scroll-area {
  touch-action: none;
  overscroll-behavior: contain;
}

/* Base Render Layers */
.pdf-render-canvas,
.photo-render-img {
  display: block;
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  -webkit-transform: translateZ(0);
  transform: translateZ(0);
}

/* Drawing Canvas Overlay: touch-action: none is crucial for Apple Pencil & stylus pointerevents */
.annotation-draw-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  touch-action: none;
  z-index: 20;
  -webkit-transform: translateZ(0);
  transform: translateZ(0);
}

/* Palm Rejection Helper: when Apple Pencil mode is active */
.annotation-draw-canvas.pencil-only {
  /* In pencil-only mode, single-finger events are allowed to bubble to parent for panning */
}

/* Text Notes Layer */
.text-notes-layer {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 30;
  -webkit-transform: translateZ(0);
  transform: translateZ(0);
}

/* Individual Sticky Note / Text Box */
.note-box {
  position: absolute;
  pointer-events: auto;
  border-radius: 6px;
  padding: 8px 10px;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.15);
  font-size: 15px;
  line-height: 1.4;
  min-width: 140px;
  min-height: 48px;
  resize: both;
  overflow: hidden;
  transition: box-shadow 0.15s ease, transform 0.15s ease;
  backdrop-filter: blur(4px);
}

.note-box:focus-within, .note-box.selected {
  box-shadow: 0 0 0 2px #3b82f6, 0 8px 24px rgba(0,0,0,0.25);
  z-index: 40;
}

.note-box-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: move;
  margin-bottom: 4px;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  opacity: 0.7;
}

.note-box textarea {
  width: 100%;
  height: calc(100% - 22px);
  background: transparent;
  border: none;
  outline: none;
  resize: none;
  font-family: inherit;
  font-size: inherit;
  color: inherit;
  line-height: inherit;
}

/* Note Color Themes */
.note-yellow {
  background-color: rgba(254, 240, 138, 0.95);
  color: #713f12;
  border: 1px solid #fde047;
}
.note-pink {
  background-color: rgba(251, 207, 232, 0.95);
  color: #831843;
  border: 1px solid #f9a8d4;
}
.note-blue {
  background-color: rgba(219, 234, 254, 0.95);
  color: #1e3a8a;
  border: 1px solid #bfdbfe;
}
.note-green {
  background-color: rgba(220, 252, 231, 0.95);
  color: #14532d;
  border: 1px solid #bbf7d0;
}
.note-purple {
  background-color: rgba(243, 232, 255, 0.95);
  color: #581c87;
  border: 1px solid #e9d5ff;
}
.note-white {
  background-color: rgba(255, 255, 255, 0.96);
  color: #0f172a;
  border: 1px solid #cbd5e1;
}

/* Direct Text Mode (Clean transparent text right on document) */
.note-direct {
  background: transparent !important;
  border: 1px dashed transparent !important;
  box-shadow: none !important;
  backdrop-filter: none !important;
  padding: 2px 4px !important;
  overflow: visible !important;
}

.note-direct .note-box-header {
  opacity: 0;
  transition: opacity 0.15s ease;
  margin-bottom: 0;
  height: 18px;
}

.note-direct:hover,
.note-direct:focus-within {
  border: 1px dashed rgba(59, 130, 246, 0.6) !important;
  box-shadow: 0 0 0 1px rgba(59, 130, 246, 0.2) !important;
}

.note-direct:hover .note-box-header,
.note-direct:focus-within .note-box-header {
  opacity: 1;
}

.note-direct textarea {
  background: transparent !important;
}


/* Paper Styles for Blank Notebooks */
.paper-ruled {
  background-color: #fdfdfd;
  background-image: 
    linear-gradient(90deg, transparent 79px, #f87171 79px, #f87171 81px, transparent 81px),
    linear-gradient(#e2e8f0 1px, transparent 1px);
  background-size: 100% 100%, 100% 32px;
}

.paper-grid {
  background-color: #ffffff;
  background-image:
    linear-gradient(#e2e8f0 1px, transparent 1px),
    linear-gradient(90deg, #e2e8f0 1px, transparent 1px);
  background-size: 24px 24px;
}

.paper-dot {
  background-color: #ffffff;
  background-image: radial-gradient(#94a3b8 1.5px, transparent 1.5px);
  background-size: 24px 24px;
}

.paper-blank {
  background-color: #ffffff;
}

.paper-chalkboard {
  background-color: #1e293b;
  background-image:
    linear-gradient(#334155 1px, transparent 1px),
    linear-gradient(90deg, #334155 1px, transparent 1px);
  background-size: 32px 32px;
}

/* Custom Scrollbars */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: rgba(148, 163, 184, 0.4);
  border-radius: 9999px;
}
::-webkit-scrollbar-thumb:hover {
  background: rgba(148, 163, 184, 0.7);
}

/* Active Tool Button Highlight & Apple-style iPad Toolbar */
.tool-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: all 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  -webkit-tap-highlight-color: transparent;
  user-select: none;
}

.tool-btn:active {
  transform: scale(0.92);
}

.tool-btn.active {
  background-color: #2563eb !important;
  color: #ffffff !important;
  box-shadow: 0 2px 10px rgba(37, 99, 235, 0.45);
  font-weight: 600;
}

.tool-btn:not(.active):hover {
  background-color: rgba(51, 65, 85, 0.7);
  color: #f8fafc;
}

/* Hide scrollbars for overflow-x navigation */
.no-scrollbar::-webkit-scrollbar {
  display: none;
}
.no-scrollbar {
  -ms-overflow-style: none;
  scrollbar-width: none;
}