/* ============================================================
   Nikshumika Spreadsheet — Reusable Style System
   Extracted from "A Calendar of Wisdom.nksh"
   ============================================================
   Usage: link this CSS, then follow the DOM structure in
   template.html. Override any --nk-* variable on :root
   to retheme.
   ============================================================ */

/* ── 1. Design Tokens ─────────────────────────────────────── */

:root {
  /* Primary */
  --nk-primary:           #217346;
  --nk-primary-hover:     #1a5c38;
  --nk-primary-dark:      #1f4e2f;

  /* Backgrounds */
  --nk-bg-body:           #e6e6e6;
  --nk-bg-ribbon:         #f3f3f3;
  --nk-bg-formula:        #f9f9f9;
  --nk-bg-header:         #f5f5f5;
  --nk-bg-cell-empty:     #fcfcfc;
  --nk-bg-cell-header:    #e2efda;
  --nk-bg-row-hover:      #e8f5e9;
  --nk-bg-month:          #f4faf5;
  --nk-bg-today:          #fff9e6;
  --nk-bg-cell:           white;

  /* Borders */
  --nk-border-major:      #d0d0d0;
  --nk-border-header:     #c0c0c0;
  --nk-border-cell:       #e8e8e8;
  --nk-border-row-header: #e4e4e4;
  --nk-border-col-header: #e0e0e0;

  /* Text */
  --nk-text:              #212121;
  --nk-text-secondary:    #333;
  --nk-text-dim:          #555;
  --nk-text-muted:        #777;
  --nk-text-faint:        #888;
  --nk-text-ghost:        #999;
  --nk-text-header:       var(--nk-primary-dark);
  --nk-text-accent:       var(--nk-primary);

  /* Typography */
  --nk-font:              'Segoe UI', Calibri, Arial, sans-serif;
  --nk-font-size-base:    12px;
  --nk-font-size-xs:      10px;
  --nk-font-size-sm:      10.5px;
  --nk-font-size-md:      11px;

  /* Fixed heights */
  --nk-h-title-bar:       30px;
  --nk-h-ribbon-tabs:     24px;
  --nk-h-formula-bar:     24px;
  --nk-h-row:             21px;
  --nk-h-col-header:      21px;
  --nk-h-sheet-tabs:      25px;
  --nk-h-status-bar:      22px;

  /* Row-header width */
  --nk-w-row-header:      36px;
  --nk-w-name-box:        72px;

  /* Scrollbar */
  --nk-scrollbar-size:    12px;
  --nk-scrollbar-track:   #f0f0f0;
  --nk-scrollbar-thumb:   #c0c0c0;
  --nk-scrollbar-hover:   #aaa;

  /* Mode-button defaults */
  --nk-mode-btn-bg:       #333;
  --nk-mode-btn-text:     #aaa;
  --nk-mode-btn-border:   #555;
}


/* ── 2. Reset & Base ──────────────────────────────────────── */

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: var(--nk-font);
  font-size: var(--nk-font-size-base);
  background: var(--nk-bg-body);
  color: var(--nk-text);
  overflow: hidden;
  height: 100vh;
  display: flex;
  flex-direction: column;
  user-select: none;
}


/* ── 3. Title Bar ─────────────────────────────────────────── */

.title-bar {
  background: var(--nk-primary);
  color: white;
  height: var(--nk-h-title-bar);
  display: flex;
  align-items: center;
  padding: 0 12px;
  font-size: var(--nk-font-size-base);
  gap: 10px;
  flex-shrink: 0;
}
.title-bar .icon     { font-size: 14px; font-weight: bold; }
.title-bar .title    { opacity: 0.95; font-size: var(--nk-font-size-md); }
.title-bar .window-controls {
  margin-left: auto;
  display: flex;
}
.title-bar .window-controls span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 46px;
  height: var(--nk-h-title-bar);
  font-size: var(--nk-font-size-xs);
  opacity: 0.8;
  cursor: default;
}


/* ── 4. Ribbon Tabs ───────────────────────────────────────── */

.ribbon-tabs {
  background: var(--nk-primary);
  display: flex;
  padding: 0 8px;
  height: var(--nk-h-ribbon-tabs);
  align-items: flex-end;
  flex-shrink: 0;
}
.ribbon-tabs span {
  padding: 3px 12px 4px;
  color: rgba(255, 255, 255, 0.6);
  font-size: var(--nk-font-size-sm);
  cursor: default;
}
.ribbon-tabs span.active {
  background: var(--nk-bg-ribbon);
  color: var(--nk-text-dim);
  border-radius: 3px 3px 0 0;
}
.ribbon-collapse-line {
  height: 3px;
  background: var(--nk-bg-ribbon);
  border-bottom: 1px solid var(--nk-border-major);
  flex-shrink: 0;
}


/* ── 5. Formula Bar ───────────────────────────────────────── */

.formula-bar {
  background: var(--nk-bg-formula);
  border-bottom: 1px solid var(--nk-border-major);
  height: var(--nk-h-formula-bar);
  display: flex;
  align-items: center;
  flex-shrink: 0;
}
.name-box {
  width: var(--nk-w-name-box);
  height: var(--nk-h-formula-bar);
  border-right: 1px solid var(--nk-border-major);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--nk-font-size-md);
  font-weight: 500;
  color: var(--nk-text-secondary);
  background: var(--nk-bg-cell);
}
.fx-label {
  padding: 0 8px;
  font-style: italic;
  color: var(--nk-text-muted);
  font-size: var(--nk-font-size-md);
  border-right: 1px solid var(--nk-border-major);
  height: 100%;
  display: flex;
  align-items: center;
}
.formula-content {
  flex: 1;
  padding: 0 8px;
  font-size: var(--nk-font-size-md);
  color: var(--nk-text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}


/* ── 6. Sheet Area (main layout) ──────────────────────────── */

.sheet-area {
  flex: 1;
  display: flex;
  overflow: hidden;
  position: relative;
  background: var(--nk-bg-cell-empty);
}

.row-headers {
  width: var(--nk-w-row-header);
  background: var(--nk-bg-header);
  border-right: 1px solid var(--nk-border-header);
  flex-shrink: 0;
  overflow: hidden;
}
.row-header-corner {
  height: var(--nk-h-col-header);
  background: #f0f0f0;
  border-bottom: 1px solid var(--nk-border-header);
}

.grid-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: auto;
  background: var(--nk-bg-cell-empty);
}


/* ── 7. Column & Row Headers ──────────────────────────────── */

.col-headers {
  display: flex;
  height: var(--nk-h-col-header);
  background: var(--nk-bg-header);
  border-bottom: 1px solid var(--nk-border-header);
  flex-shrink: 0;
  position: sticky;
  top: 0;
  z-index: 10;
}
.col-h {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--nk-font-size-xs);
  color: var(--nk-text-faint);
  border-right: 1px solid var(--nk-border-col-header);
  flex-shrink: 0;
  position: relative;
}
.row-h {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--nk-font-size-xs);
  color: var(--nk-text-faint);
  border-bottom: 1px solid var(--nk-border-row-header);
  height: var(--nk-h-row);
  position: relative;
}


/* ── 8. Resize Handles ────────────────────────────────────── */

.col-h .col-resize-handle {
  position: absolute;
  right: -3px;
  top: 0;
  width: 6px;
  height: 100%;
  cursor: col-resize;
  z-index: 20;
}
.col-h .col-resize-handle:hover,
.col-h .col-resize-handle.dragging {
  background: var(--nk-primary);
  opacity: 0.5;
}
.row-h .row-resize-handle {
  position: absolute;
  bottom: -3px;
  left: 0;
  width: 100%;
  height: 6px;
  cursor: row-resize;
  z-index: 20;
}
.row-h .row-resize-handle:hover,
.row-h .row-resize-handle.dragging {
  background: var(--nk-primary);
  opacity: 0.5;
}
.resize-line-col {
  position: fixed;
  top: 0;
  bottom: 0;
  width: 1px;
  border-left: 1px dashed var(--nk-primary);
  z-index: 100;
  pointer-events: none;
}
.resize-line-row {
  position: fixed;
  left: 0;
  right: 0;
  height: 1px;
  border-top: 1px dashed var(--nk-primary);
  z-index: 100;
  pointer-events: none;
}


/* ── 9. Grid Rows & Cells ─────────────────────────────────── */

.grid-rows { flex: 1; }

.grid-row {
  display: flex;
  border-bottom: 1px solid var(--nk-border-cell);
}

.cell {
  border-right: 1px solid var(--nk-border-cell);
  padding: 2px 6px;
  font-size: var(--nk-font-size-md);
  color: var(--nk-text);
  display: flex;
  align-items: center;
  flex-shrink: 0;
  overflow: hidden;
  height: var(--nk-h-row);
  transition: background-color 0.3s, box-shadow 0.3s;
}

/* Selected cell */
.cell.selected {
  outline: 2px solid var(--nk-primary);
  outline-offset: -1px;
  background: var(--nk-bg-cell);
  z-index: 2;
  position: relative;
}

/* Header cell (column/row labels inside the grid) */
.cell.header-cell {
  font-weight: 700;
  background: var(--nk-bg-cell-header);
  color: var(--nk-text-header);
}

/* Empty cell */
.cell.c-empty {
  background: var(--nk-bg-cell-empty);
}

/* Snek game cells */
.cell.snek-body,
.cell.snek-head {
  justify-content: center;
  padding: 0;
  color: white;
  font-weight: 800;
  font-size: 10px;
  text-shadow: 0 1px 1px rgba(0, 0, 0, 0.45);
  box-shadow: inset 0 0 9px rgba(0, 0, 0, 0.3);
}
.cell.snek-head {
  border-radius: 8px;
  outline: 2px solid rgba(255, 255, 255, 0.75);
  outline-offset: -3px;
  z-index: 3;
}
.cell.snek-body {
  border-radius: 5px;
}
.cell.snek-unconscious { background: #4a4a4a !important; }
.cell.snek-step-0 { background: #5b2a86 !important; }
.cell.snek-step-1 { background: #008f8c !important; }
.cell.snek-step-2 { background: #d97904 !important; }
.cell.snek-step-3 { background: #2b579a !important; }
.cell.snek-step-4 { background: #217346 !important; }
.cell.snek-step-5 { background: #c49a00 !important; }
.cell.snek-food-negative {
  align-items: center;
  justify-content: center;
  padding: 0 3px;
  background: #fff2cc !important;
  color: #7f1d1d;
  border: 1px solid #e0b24a;
  font-size: 11px;
  font-weight: 700;
  font-style: italic;
  text-transform: lowercase;
  line-height: 1.05;
  text-align: center;
  overflow: visible;
  position: relative;
  white-space: nowrap;
  z-index: 4;
}
.cell.snek-food-step {
  align-items: center;
  justify-content: center;
  padding: 0 3px;
  color: white;
  border: 1px solid rgba(255, 255, 255, 0.65);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.4px;
  text-transform: uppercase;
  overflow: visible;
  position: relative;
  white-space: nowrap;
  z-index: 5;
  animation: snek-step-pulse 1.1s ease-in-out infinite;
}
.cell.snek-crash {
  background: #cc0000 !important;
  animation: snek-crash-blink 0.18s steps(2, end) 8;
}
.cell.snek-world-end {
  background: #050505 !important;
  box-shadow: inset 0 0 8px rgba(255, 255, 255, 0.08);
}
.cell.snek-smile {
  background: #ffd84d !important;
  box-shadow: inset 0 0 8px rgba(128, 86, 0, 0.18);
}

/* Overflow-visible cell (text spills past column boundary) */
.cell.flow {
  overflow: visible;
  white-space: nowrap;
  z-index: 1;
  position: relative;
}


/* ── 10. Data-type Cell Variants ──────────────────────────── */

.cell.c-date {
  color: var(--nk-text-dim);
  white-space: normal;
  word-wrap: break-word;
}
.cell.c-number {
  justify-content: flex-end;
  font-variant-numeric: tabular-nums;
}
.cell.c-muted {
  color: var(--nk-text-ghost);
  font-size: var(--nk-font-size-xs);
}
.cell.c-accent {
  font-weight: 700;
  color: var(--nk-text-accent);
}
.cell.c-bold {
  font-weight: 600;
}
.cell.c-italic {
  font-style: italic;
}
.cell.c-wrap {
  white-space: normal;
  word-wrap: break-word;
}


/* ── 11. Table-row Variants (All-items view) ──────────────── */

.data-row .cell          { height: 28px; font-size: var(--nk-font-size-md); }
.data-row .cell.dr-num   { justify-content: flex-end; color: var(--nk-text-ghost); padding-right: 8px; font-size: var(--nk-font-size-xs); }
.data-row .cell.dr-label { font-weight: 700; color: var(--nk-primary); background: var(--nk-bg-month); font-size: var(--nk-font-size-xs); }
.data-row .cell.dr-dim   { justify-content: center; color: var(--nk-text-muted); font-size: var(--nk-font-size-xs); }
.data-row .cell.dr-text  { color: var(--nk-text-secondary); font-style: italic; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; cursor: pointer; }
.data-row .cell.dr-bold  { font-weight: 600; color: var(--nk-primary-dark); }
.data-row .cell.dr-faint { color: var(--nk-text-ghost); font-size: var(--nk-font-size-xs); }

.data-row:hover .cell {
  background: var(--nk-bg-row-hover) !important;
}
.data-row.dr-highlight .cell {
  background: var(--nk-bg-today) !important;
  font-weight: 500;
}
.data-row.dr-highlight .cell.dr-text { font-weight: 400; }


/* ── 12. Sheet Tabs (bottom bar) ──────────────────────────── */

.sheet-tabs {
  background: var(--nk-bg-body);
  height: var(--nk-h-sheet-tabs);
  display: flex;
  align-items: center;
  border-top: 1px solid var(--nk-border-header);
  padding: 0 6px;
  gap: 1px;
  flex-shrink: 0;
}
.sheet-tab-nav {
  display: flex;
  gap: 1px;
  margin-right: 6px;
}
.sheet-tab-nav span {
  font-size: 9px;
  color: var(--nk-text-ghost);
  padding: 0 3px;
}
.sheet-tab {
  padding: 3px 16px;
  font-size: var(--nk-font-size-md);
  background: var(--nk-bg-cell);
  border: 1px solid var(--nk-border-header);
  border-bottom: 1px solid var(--nk-bg-cell);
  border-radius: 3px 3px 0 0;
  color: var(--nk-text-secondary);
  font-weight: 500;
  cursor: pointer;
  position: relative;
  bottom: -1px;
}
.sheet-tab.inactive {
  background: #e8e8e8;
  color: #666;
  font-weight: 400;
  border-bottom: 1px solid var(--nk-border-header);
}
.sheet-tab:hover:not(.active-tab) {
  background: #dde8dd;
}


/* ── 13. Mode / Toggle Buttons ────────────────────────────── */

.mode-buttons {
  margin-left: auto;
  display: flex;
  gap: 3px;
  padding-right: 8px;
}
.mode-btn {
  padding: 3px 14px;
  font-size: var(--nk-font-size-xs);
  font-family: var(--nk-font);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  background: var(--nk-mode-btn-bg);
  color: var(--nk-mode-btn-text);
  border: 1px solid var(--nk-mode-btn-border);
  cursor: pointer;
  transition: all 0.15s;
}
.mode-btn:hover {
  background: #444;
  color: #ddd;
}
.mode-btn.active {
  background: var(--nk-primary);
  color: white;
  border-color: var(--nk-primary);
}
.mode-btn.snek-dir-btn {
  min-width: 48px;
  padding-left: 8px;
  padding-right: 8px;
}
/* Per-button color overrides — add your own as needed:
   .mode-btn.danger.active  { background: #cc0000; border-color: #cc0000; }
   .mode-btn.special.active { background: #8b00ff; border-color: #8b00ff; }
*/


/* ── 14. Status Bar ───────────────────────────────────────── */

.status-bar {
  background: var(--nk-primary);
  height: var(--nk-h-status-bar);
  display: flex;
  align-items: center;
  padding: 0 12px;
  color: rgba(255, 255, 255, 0.8);
  font-size: var(--nk-font-size-xs);
  flex-shrink: 0;
}
.status-bar .right {
  margin-left: auto;
  display: flex;
  gap: 14px;
}


/* ── 15. Custom Scrollbar ─────────────────────────────────── */

.grid-area::-webkit-scrollbar       { width: var(--nk-scrollbar-size); height: var(--nk-scrollbar-size); }
.grid-area::-webkit-scrollbar-track  { background: var(--nk-scrollbar-track); }
.grid-area::-webkit-scrollbar-thumb  { background: var(--nk-scrollbar-thumb); border-radius: 0; }
.grid-area::-webkit-scrollbar-thumb:hover { background: var(--nk-scrollbar-hover); }


/* ── 16. Keyframe Animations ──────────────────────────────── */

@keyframes nk-blink {
  50% { opacity: 0; }
}
@keyframes nk-acid-pulse {
  0%   { background: inherit; }
  25%  { background: rgba(255, 0, 102, 0.13); }
  50%  { background: rgba(0, 255, 102, 0.13); }
  75%  { background: rgba(102, 0, 255, 0.13); }
  100% { background: inherit; }
}
@keyframes snek-step-pulse {
  0%, 100% { filter: brightness(1); }
  50%      { filter: brightness(1.3); }
}
@keyframes snek-crash-blink {
  50% { filter: brightness(1.8); }
}


/* ── 17. Column-width Utility Classes ─────────────────────── */
/* Define as many as your app needs. Widths are easily
   overridden inline or via JS when columns are resized. */

.w-a { width: 36px;  }
.w-b { width: 80px;  }
.w-c { width: 140px; }
.w-d { width: 120px; }
.w-e { width: 160px; }
.w-f { width: 120px; }
.w-g { width: 80px;  }
.w-h { width: 80px;  }
.w-i { width: 80px;  }


/* ── 18. Responsive ───────────────────────────────────────── */

@media (max-width: 700px) {
  .w-d { width: 260px; min-width: 180px; }
  .w-e { width: 110px; }
  .w-f { width: 80px;  }
  .w-g, .w-h, .w-i { width: 60px; }
}