/* ── Reset & Base ──────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:        #1e1e2e;
  --bg-alt:    #181825;
  --surface:   #252538;
  --surface2:  #2a2a3d;
  --border:    #3b3b54;
  --border-lt: #4a4a65;
  --text:      #e2eafc;
  --text-dim:  #b8c7e8;
  --text-muted:#8294b8;
  --accent:    #89b4fa;
  --accent2:   #74c7ec;
  --green:     #a6e3a1;
  --red:       #f38ba8;
  --yellow:    #f9e2af;
  --header-bg: #1b1b2d;
  --selected:  rgba(137,180,250,0.15);
  --highlight: rgba(249,226,175,0.30);
  --row-height: 26px;
  --col-width:  100px;
  --header-w:   46px;
  --header-h:   28px;
  --formula-h:  32px;
  --topbar-h:   42px;
  --tabs-h:     34px;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  font-size: 13px;
  color: var(--text);
  background: var(--bg);
}

body {
  height: 100vh;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

/* ── Top Bar ──────────────────────────────────────────── */
#topbar {
  height: var(--topbar-h);
  background: var(--bg-alt);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 12px;
  flex-shrink: 0;
}
#topbar-left {
  display: flex;
  align-items: center;
  gap: 8px;
}
#logo-icon { color: var(--accent); }
#workbook-title {
  font-weight: 600;
  font-size: 14px;
  color: var(--text);
}

#topbar-right {
  display: flex;
  align-items: center;
  gap: 10px;
}

/* Search */
#search-box {
  display: flex;
  align-items: center;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 0 8px;
  height: 28px;
  gap: 5px;
}
#search-box svg { color: var(--text-muted); flex-shrink: 0; }
#search-input {
  background: none;
  border: none;
  color: var(--text);
  font-size: 12px;
  width: 150px;
  outline: none;
}
#search-input::placeholder { color: var(--text-muted); }
#search-count {
  font-size: 11px;
  color: var(--text-muted);
  white-space: nowrap;
}
.search-nav {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 10px;
  padding: 2px;
  line-height: 1;
}
.search-nav:hover { color: var(--text); }

/* Download */
#download-btn {
  display: flex;
  align-items: center;
  gap: 5px;
  background: var(--accent);
  color: var(--bg);
  border: none;
  border-radius: 5px;
  padding: 5px 12px;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  transition: opacity 0.15s;
}
#download-btn:hover { opacity: 0.85; }
#download-btn svg { stroke: var(--bg); }

/* ── Formula Bar ──────────────────────────────────────── */
#formula-bar {
  height: var(--formula-h);
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  flex-shrink: 0;
}
#cell-ref {
  width: 70px;
  text-align: center;
  font-weight: 600;
  color: var(--accent);
  border-right: 1px solid var(--border);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  flex-shrink: 0;
}
#cell-value-display {
  flex: 1;
  padding: 0 10px;
  font-size: 12px;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* ── Spreadsheet Layout ───────────────────────────────── */
#spreadsheet-container {
  flex: 1;
  display: grid;
  grid-template-columns: var(--header-w) 1fr;
  grid-template-rows: var(--header-h) 1fr;
  overflow: hidden;
  position: relative;
}

/* Corner cell */
#corner {
  background: var(--header-bg);
  border-right: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  z-index: 4;
}

/* Column headers */
#col-headers-wrapper {
  overflow: hidden;
  background: var(--header-bg);
  border-bottom: 1px solid var(--border);
  z-index: 3;
}
#col-headers {
  display: flex;
  height: var(--header-h);
}
.col-header {
  min-width: var(--col-width);
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  font-weight: 600;
  color: var(--text-dim);
  border-right: 1px solid var(--border);
  flex-shrink: 0;
  user-select: none;
}
.col-header.active {
  color: var(--accent);
  background: var(--selected);
}

/* Row headers */
#row-headers-wrapper {
  overflow: hidden;
  background: var(--header-bg);
  border-right: 1px solid var(--border);
  z-index: 3;
}
#row-headers {
  display: flex;
  flex-direction: column;
}
.row-header {
  width: var(--header-w);
  min-height: var(--row-height);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  font-weight: 500;
  color: var(--text-dim);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  user-select: none;
}
.row-header.active {
  color: var(--accent);
  background: var(--selected);
}

/* Grid */
#grid-wrapper {
  overflow: auto;
  position: relative;
}
#grid {
  position: relative;
}

/* Cells */
.cell {
  position: absolute;
  height: var(--row-height);
  display: flex;
  align-items: center;
  padding: 0 6px;
  font-size: 12px;
  border-right: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
  cursor: cell;
  color: var(--text);
  transition: background 0.08s;
}
.cell:hover {
  background: var(--selected);
}
.cell.selected {
  outline: 2px solid var(--accent);
  outline-offset: -1px;
  background: var(--selected);
  z-index: 2;
}
.cell.search-match {
  background: var(--highlight) !important;
}
.cell.search-active {
  outline: 2px solid var(--yellow) !important;
  outline-offset: -1px;
  z-index: 3;
}

/* Number formatting helpers */
.cell.num { text-align: right; justify-content: flex-end; }
.cell.str { text-align: left; justify-content: flex-start; }
.cell.pct-positive { color: #a6e3a1 !important; }
.cell.pct-negative { color: #f38ba8 !important; }

/* ── Sheet Tabs ───────────────────────────────────────── */
#sheet-tabs-bar {
  height: var(--tabs-h);
  background: var(--bg-alt);
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 8px;
  flex-shrink: 0;
  overflow-x: auto;
}
#sheet-tabs {
  display: flex;
  gap: 2px;
  align-items: center;
}
.sheet-tab {
  padding: 5px 16px;
  font-size: 12px;
  color: var(--text-muted);
  background: transparent;
  border: none;
  border-radius: 4px 4px 0 0;
  cursor: pointer;
  white-space: nowrap;
  transition: background 0.15s, color 0.15s;
  border-bottom: 2px solid transparent;
}
.sheet-tab:hover {
  color: var(--text);
  background: var(--surface);
}
.sheet-tab.active {
  color: var(--accent);
  background: var(--surface);
  border-bottom: 2px solid var(--accent);
  font-weight: 600;
}
#sheet-info {
  font-size: 11px;
  color: var(--text-muted);
  white-space: nowrap;
  padding-left: 12px;
  flex-shrink: 0;
}

/* ── Scrollbar ────────────────────────────────────────── */
#grid-wrapper::-webkit-scrollbar { width: 10px; height: 10px; }
#grid-wrapper::-webkit-scrollbar-track { background: var(--bg-alt); }
#grid-wrapper::-webkit-scrollbar-thumb { background: var(--border-lt); border-radius: 5px; }
#grid-wrapper::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }
#grid-wrapper::-webkit-scrollbar-corner { background: var(--bg-alt); }

/* ── Loading ──────────────────────────────────────────── */
#loading-overlay {
  position: fixed;
  inset: 0;
  background: var(--bg);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  font-size: 16px;
  color: var(--text-dim);
}

/* ── Responsive ───────────────────────────────────────── */
@media (max-width: 640px) {
  #search-input { width: 100px; }
  #download-btn span { display: none; }
  :root { --col-width: 80px; }
}