/* ========================================================
   NotePot Core Stylesheet — Clean Light Mode Architecture
   Precision Handwritten Notebook Engine & A4 Document Canvas
   ======================================================== */

@import url('https://fonts.googleapis.com/css2?family=Alex+Brush&family=Amita:wght@400;700&family=Bad+Script&family=Beth+Ellen&family=Caveat:wght@400;600;700&family=Courgette&family=Covered+By+Your+Grace&family=Dancing+Script:wght@400;600;700&family=Dekko&family=Gloria+Hallelujah&family=Gochi+Hand&family=Great+Vibes&family=Halant:wght@400;600&family=Homemade+Apple&family=Indie+Flower&family=Just+Another+Hand&family=Kalam:wght@300;400;700&family=Klee+One:wght@400;600&family=Kurale&family=Loved+by+the+King&family=Mali:ital,wght@0,400;0,600;1,400&family=Marck+Script&family=Modak&family=Nanum+Pen+Script&family=Nothing+You+Could+Do&family=Over+the+Rainbow&family=Pacifico&family=Patrick+Hand&family=Permanent+Marker&family=Reenie+Beanie&family=Rozha+One&family=Sacramento&family=Sahitya:wght@400;700&family=Satisfy&family=Schoolbell&family=Shadows+Into+Light&family=Tillana:wght@400;600;700&family=Yatra+One&family=Yellowtail&family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  --line-spacing: 36px;
  --word-spacing: 4px;
  --letter-spacing: 0.5px;
  --font-size: 22px;
  --ink-color: #1e3a8a;
  --ink-shadow: rgba(30, 58, 138, 0.2);
  --page-width: 794px;  /* Standard A4 at 96 DPI */
  --page-height: 1123px; /* Standard A4 at 96 DPI */
  --margin-left: 72px;
  --margin-right: 48px;
  --margin-top: 88px;
  --margin-bottom: 56px;
}

/* Custom Scrollbars */
.custom-scrollbar::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}
.custom-scrollbar::-webkit-scrollbar-track {
  background: #ffffff;
}
.custom-scrollbar::-webkit-scrollbar-thumb {
  background: #e5e7eb;
  border-radius: 3px;
}
.custom-scrollbar::-webkit-scrollbar-thumb:hover {
  background: #cbd5e1;
}

/* Base Body (Clean Pure White Workspace Desk) */
body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background-color: #ffffff;
  color: #111827;
  overflow-x: hidden;
}

/* NotePot A4 Page Sheet Container */
.notepot-page-wrapper {
  perspective: 1000px;
}

.notepot-page-sheet {
  width: var(--page-width);
  min-height: var(--page-height);
  max-height: var(--page-height);
  position: relative;
  background-color: #ffffff;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06), 0 10px 15px -3px rgba(0, 0, 0, 0.04);
  border: 1px solid #e5e7eb;
  margin-left: auto;
  margin-right: auto;
  overflow: hidden;
  box-sizing: border-box;
  page-break-after: always;
  border-radius: 2px;
}

/* ========================================================
   PAPER STYLES (AUTHENTIC NOTEBOOKS)
   ======================================================== */

/* 1. Authentic Hindi Ruled Notebook Page */
.paper-hindi-notebook {
  background-color: #fefdf9;
  /* Ruled lines pattern */
  background-image: 
    /* Red left vertical margin line */
    linear-gradient(to right, transparent var(--margin-left), #ef4444 var(--margin-left), #ef4444 calc(var(--margin-left) + 1.5px), transparent calc(var(--margin-left) + 2px)),
    /* Top double red margin line */
    linear-gradient(to bottom, transparent calc(var(--margin-top) - 14px), #ef4444 calc(var(--margin-top) - 14px), #ef4444 calc(var(--margin-top) - 12.5px), transparent calc(var(--margin-top) - 12.5px)),
    linear-gradient(to bottom, transparent calc(var(--margin-top) - 8px), #ef4444 calc(var(--margin-top) - 8px), #ef4444 calc(var(--margin-top) - 6.5px), transparent calc(var(--margin-top) - 6.5px)),
    /* Ruled blue lines aligned to line-spacing */
    repeating-linear-gradient(to bottom, transparent, transparent calc(var(--line-spacing) - 1px), #93c5fd calc(var(--line-spacing) - 1px), #93c5fd var(--line-spacing));
  background-position: 0 0, 0 0, 0 0, 0 var(--margin-top);
  background-repeat: no-repeat, no-repeat, no-repeat, repeat;
}

/* 2. Hindi Double Line Notebook Page */
.paper-hindi-double-line {
  background-color: #fffdfa;
  background-image: 
    /* Red vertical left margin */
    linear-gradient(to right, transparent var(--margin-left), #ef4444 var(--margin-left), #ef4444 calc(var(--margin-left) + 1.5px), transparent calc(var(--margin-left) + 2px)),
    /* Double guide lines */
    repeating-linear-gradient(to bottom, 
      transparent 0px, 
      transparent calc(var(--line-spacing) - 12px), 
      #93c5fd calc(var(--line-spacing) - 12px), 
      #93c5fd calc(var(--line-spacing) - 11px), 
      transparent calc(var(--line-spacing) - 11px), 
      transparent calc(var(--line-spacing) - 1px), 
      #3b82f6 calc(var(--line-spacing) - 1px), 
      #3b82f6 var(--line-spacing)
    );
  background-position: 0 0, 0 var(--margin-top);
  background-repeat: no-repeat, repeat;
}

/* 3. White Ruled A4 Page (Adjustable line spacing) */
.paper-white-ruled {
  background-color: #ffffff;
  background-image: 
    repeating-linear-gradient(to bottom, transparent, transparent calc(var(--line-spacing) - 1px), #cbd5e1 calc(var(--line-spacing) - 1px), #cbd5e1 var(--line-spacing));
  background-position: 0 var(--margin-top);
  background-repeat: repeat;
}

/* 4. White Plain A4 Page */
.paper-white-plain {
  background-color: #ffffff;
  background-image: none;
}

/* 5. Math Grid Page */
.paper-math-grid {
  background-color: #ffffff;
  background-image: 
    linear-gradient(to right, #e2e8f0 1px, transparent 1px),
    linear-gradient(to bottom, #e2e8f0 1px, transparent 1px);
  background-size: 24px 24px;
}

/* 6. Vintage Parchment Page */
.paper-vintage-parchment {
  background-color: #f7f1e3;
  background-image: 
    radial-gradient(ellipse at center, rgba(255,255,255,0.4) 0%, rgba(200, 180, 140, 0.15) 100%),
    repeating-linear-gradient(to bottom, transparent, transparent calc(var(--line-spacing) - 1px), #d1b894 calc(var(--line-spacing) - 1px), #d1b894 var(--line-spacing));
  background-position: 0 0, 0 var(--margin-top);
  background-repeat: no-repeat, repeat;
}

/* ========================================================
   NOTEBOOK HEADER (PAGE NO & DATE)
   ======================================================== */
.notepot-header-box {
  position: absolute;
  top: 20px;
  right: var(--margin-right);
  border: 1px solid #ef4444;
  border-radius: 4px;
  padding: 4px 10px;
  font-family: 'Kalam', cursive, sans-serif;
  font-size: 13px;
  color: #b91c1c;
  background-color: #ffffff;
  z-index: 10;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.notepot-header-box input {
  background: transparent;
  border: none;
  border-bottom: 1px dotted #fca5a5;
  color: #1e3a8a;
  font-family: inherit;
  font-size: 13px;
  width: 90px;
  padding: 0 2px;
  outline: none;
}

/* ========================================================
   NOTEBOOK TEXT EDITABLE AREA
   ======================================================== */
.notepot-content-area {
  position: absolute;
  top: var(--margin-top);
  left: calc(var(--margin-left) + 12px);
  right: var(--margin-right);
  bottom: var(--margin-bottom);
  outline: none;
  font-size: var(--font-size);
  color: var(--ink-color);
  line-height: var(--line-spacing);
  word-spacing: var(--word-spacing);
  letter-spacing: var(--letter-spacing);
  overflow: hidden;
  white-space: pre-wrap;
  word-break: break-word;
  padding-top: 0px;
  box-sizing: border-box;
}

.notepot-content-area:empty:not(:focus)::before {
  content: "Click here to start writing or paste your assignment...";
  color: #94a3b8;
  opacity: 0.7;
  font-family: inherit;
  font-size: 0.9em;
  pointer-events: none;
  display: block;
}

/* Realistic Ink Bleed Effect */
.ink-bleed-active .notepot-content-area {
  text-shadow: 0 0 0.5px var(--ink-shadow);
}

/* Paper Grain Texture Overlay */
.paper-texture-overlay {
  pointer-events: none;
  position: absolute;
  inset: 0;
  opacity: 0.03;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
  z-index: 5;
}

/* Margin Hole Punch Decoration (Classic Student Binder Look) */
.margin-binder-holes {
  position: absolute;
  left: 20px;
  top: 0;
  bottom: 0;
  display: flex;
  flex-direction: column;
  justify-content: space-around;
  pointer-events: none;
  z-index: 6;
}

.margin-binder-hole {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: #e2e8f0;
  box-shadow: inset 0 1px 2px rgba(0,0,0,0.2);
}

/* Overflow Warning */
.page-overflow-warning {
  position: absolute;
  bottom: 12px;
  right: 16px;
  background-color: #dc2626;
  color: #ffffff;
  padding: 4px 8px;
  border-radius: 4px;
  font-size: 11px;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 4px;
  z-index: 20;
}

/* Responsive Tablet & Mobile Preview Handling */
@media screen and (max-width: 860px) {
  #pages-container {
    width: 100%;
    overflow-x: auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 0 8px 30px 8px;
  }
  
  .notepot-page-sheet {
    max-width: 100%;
    /* Keep precise A4 aspect ratio while scaling comfortably on tablets if needed */
  }
}

/* Print/PDF Export Optimization */
@media print {
  body {
    background: transparent !important;
    padding: 0 !important;
  }
  .no-print {
    display: none !important;
  }
  .notepot-page-sheet {
    box-shadow: none !important;
    border: none !important;
    margin: 0 !important;
    page-break-after: always !important;
  }
}