/* =====================================================================
   LOTUS 1-2-3 — browser recreation, IBM PC/XT aesthetic
   styles.css is split into five sections:
     1. Page / dark room
     2. IBM PC/XT tower (case, bays, floppy, badges)
     3. CRT monitor (bezel, screen, overlays, Lotus surface)
     4. Spreadsheet grid, indicator, mode strip, key line
     5. Legend, soft-keys
   ===================================================================== */

/* ---------- Reset ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  height: 100%;
}

body {
  font-family: "IBM Plex Mono", "VT323", "Courier New", monospace;
  background: #050505;
  color: #ffb000;
  overflow-x: hidden;
}

/* =====================================================================
   1. PAGE — dim office with warm desk-lamp highlight
   ===================================================================== */

body {
  background:
    radial-gradient(
      ellipse at 50% 38%,
      rgba(60, 50, 30, 0.45) 0%,
      rgba(20, 16, 10, 0.9) 70%
    ),
    #050505;
  overflow: hidden;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-end;
  padding: 14px 14px 0;
  padding-bottom: max(0px, env(safe-area-inset-bottom));
  gap: 10px;
}

.room {
  position: relative;
  width: 100%;
  max-width: 1400px;
  display: grid;
  grid-template-columns: 1fr minmax(220px, 360px);
  grid-template-rows: auto;
  align-items: end;
  gap: 18px;
  flex: 1;
  padding: 20px 8px 0;
}

.desk-shadow {
  position: absolute;
  inset: 70% 0 0 0;
  background: radial-gradient(
    ellipse at 50% 30%,
    rgba(0, 0, 0, 0.7) 0%,
    rgba(0, 0, 0, 0) 70%
  );
  pointer-events: none;
  z-index: 0;
}

.floor-shadow {
  position: absolute;
  bottom: -10px;
  left: 50%;
  width: 78%;
  height: 16px;
  transform: translateX(-50%);
  background: radial-gradient(
    ellipse at 50% 50%,
    rgba(0, 0, 0, 0.65) 0%,
    rgba(0, 0, 0, 0) 75%
  );
  filter: blur(4px);
  pointer-events: none;
}

/* =====================================================================
   2. IBM PC/XT TOWER — beige, two-tone plastic, drive bays
   ===================================================================== */

.tower {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 280px;
  justify-self: end;
  filter: drop-shadow(0 28px 32px rgba(0, 0, 0, 0.7));
}

.tower-front {
  position: relative;
  aspect-ratio: 220 / 380;
  border-radius: 10px 10px 4px 4px;
  background:
    linear-gradient(180deg, #d8c8a3 0%, #cdb98c 60%, #b9a372 100%);
  box-shadow:
    inset 0 2px 0 rgba(255, 255, 255, 0.45),
    inset 0 -3px 0 rgba(0, 0, 0, 0.18),
    0 0 0 1px rgba(0, 0, 0, 0.4);
  padding: 10px 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  overflow: hidden;
}

.tower-bezel-top,
.tower-bezel-bottom {
  height: 8px;
  background: linear-gradient(180deg, #bea672, #b39862);
  border-radius: 3px;
}

.tower-front::before {
  /* Subtle vertical seam */
  content: "";
  position: absolute;
  left: 8px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: rgba(0, 0, 0, 0.08);
}

/* 5.25" floppy drive slot */
.floppy {
  position: relative;
  background: #1c1c1c;
  height: 50px;
  border-radius: 3px;
  padding: 6px 8px;
  display: flex;
  align-items: center;
  gap: 8px;
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.15),
    inset 0 -1px 0 rgba(0, 0, 0, 0.6),
    0 1px 0 rgba(0, 0, 0, 0.3);
}

.floppy-slot {
  flex: 1;
  height: 28px;
  background: #050505;
  border-radius: 2px;
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.1),
    inset 0 -2px 4px rgba(0, 0, 0, 0.6);
  position: relative;
  overflow: hidden;
}

.floppy-slot::before {
  content: "";
  position: absolute;
  inset: 4px 6px;
  background: linear-gradient(
    180deg,
    transparent 0%,
    rgba(255, 255, 255, 0.06) 50%,
    transparent 100%
  );
}

.floppy-led {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #250;
  box-shadow: 0 0 4px rgba(0, 0, 0, 0.6);
}

.floppy-label {
  position: absolute;
  bottom: 3px;
  left: 8px;
  font-size: 8px;
  letter-spacing: 0.4px;
  color: rgba(255, 255, 255, 0.7);
  font-family: "IBM Plex Mono", monospace;
  text-transform: uppercase;
  pointer-events: none;
}

/* Drive bays */
.tower-bays {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-top: 6px;
}

.bay {
  height: 12px;
  background: #6f5e36;
  border-radius: 2px;
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.18),
    inset 0 -1px 0 rgba(0, 0, 0, 0.3);
  position: relative;
}

.bay::after {
  content: "";
  position: absolute;
  right: 6px;
  top: 50%;
  width: 4px;
  height: 4px;
  background: #1c1c1c;
  transform: translateY(-50%);
  border-radius: 1px;
  box-shadow: inset 0 0 2px rgba(0, 0, 0, 0.6);
}

.tower-power {
  margin-top: auto;
  display: grid;
  grid-template-columns: auto auto auto auto 1fr;
  align-items: center;
  gap: 6px;
  padding: 6px 4px;
}

.tower-led,
.tower-led-label {
  font-size: 8px;
  letter-spacing: 0.5px;
}

.tower-led {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  box-shadow: 0 0 4px rgba(0, 0, 0, 0.5);
}

#power-led {
  background: radial-gradient(circle at 30% 30%, #ffd058, #b07c1a);
  box-shadow: 0 0 6px rgba(255, 180, 60, 0.55);
  animation: pulse 3.5s ease-in-out infinite;
}

#hdd-led {
  background: #0f2206;
  box-shadow: 0 0 0 rgba(0, 0, 0, 0);
}

#hdd-led.on {
  background: radial-gradient(circle at 30% 30%, #6fff38, #2a940f);
  box-shadow: 0 0 6px rgba(120, 255, 70, 0.55);
  transition: background 60ms linear, box-shadow 60ms linear;
}

@keyframes pulse {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0.78;
  }
}

.tower-led-label {
  color: #4a3b1d;
  font-weight: 600;
}

.tower-keylock {
  justify-self: end;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background:
    linear-gradient(135deg, #b9a372 0%, #6f5e36 100%);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.4),
    inset 0 -1px 0 rgba(0, 0, 0, 0.3);
  position: relative;
}

.tower-keylock::before {
  content: "";
  position: absolute;
  inset: 4px;
  border-radius: 50%;
  background: #3a2f15;
  box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.6);
}

.tower-keylock::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  width: 7px;
  height: 2px;
  background: #1a1306;
  transform: translate(-50%, -50%) rotate(35deg);
  border-radius: 1px;
}

.tower-badge {
  position: absolute;
  bottom: 22px;
  left: 50%;
  transform: translateX(-50%);
  font-family: "Times New Roman", serif;
  font-style: italic;
  font-size: 12px;
  color: #4a3b1d;
  letter-spacing: 0.4px;
  white-space: nowrap;
  text-shadow: 0 1px 0 rgba(255, 255, 255, 0.4);
}

.tower-badge-small {
  position: absolute;
  top: 14px;
  right: 12px;
  font-size: 11px;
  font-weight: 600;
  color: #4a3b1d;
  letter-spacing: 0.6px;
  background: #bea672;
  padding: 2px 6px;
  border-radius: 2px;
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.4),
    inset 0 -1px 0 rgba(0, 0, 0, 0.2);
}

.tower-shadow {
  position: absolute;
  left: 5%;
  right: 5%;
  bottom: -16px;
  height: 18px;
  border-radius: 50%;
  background: radial-gradient(ellipse at center, rgba(0, 0, 0, 0.7), transparent 70%);
  filter: blur(4px);
  pointer-events: none;
}

/* =====================================================================
   3. CRT MONITOR — beige casing, deep bezel, amber CRT
   ===================================================================== */

.monitor {
  position: relative;
  z-index: 2;
  width: 100%;
  max-width: 980px;
  display: flex;
  flex-direction: column;
  align-items: center;
  filter: drop-shadow(0 24px 32px rgba(0, 0, 0, 0.7));
}

.monitor-casing {
  width: 100%;
  position: relative;
  border-radius: 18px 18px 8px 8px;
  background:
    linear-gradient(180deg, #e1d2a8 0%, #d2bf8c 60%, #b9a372 100%);
  padding: 28px 28px 14px;
  box-shadow:
    inset 0 2px 0 rgba(255, 255, 255, 0.45),
    inset 0 -3px 0 rgba(0, 0, 0, 0.18),
    0 0 0 1px rgba(0, 0, 0, 0.4);
}

.monitor-casing::before {
  /* Brand strip on top */
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 10px;
  height: 6px;
  background: linear-gradient(180deg, #b39862, #9c8452);
  border-radius: 4px;
  margin: 0 16px;
  opacity: 0.55;
}

.bezel {
  width: 100%;
  aspect-ratio: 4 / 3;
  background: #14110a;
  border-radius: 8px;
  padding: 16px;
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.18),
    inset 0 -2px 0 rgba(0, 0, 0, 0.5),
    0 0 0 2px #3a2f15;
}

.bezel-inner {
  width: 100%;
  height: 100%;
  background: #050401;
  border-radius: 4px;
  position: relative;
  overflow: hidden;
  box-shadow: inset 0 0 12px rgba(0, 0, 0, 0.95);
}

.screen {
  position: relative;
  width: 100%;
  height: 100%;
  background: #0a0904;
  color: #ffb000;
  font-family: "IBM Plex Mono", "VT323", monospace;
  font-weight: 500;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* CRT phosphor overlays */
body[data-phosphor="amber"] .screen {
  color: #ffb000;
}
body[data-phosphor="green"] .screen {
  color: #6cff5a;
}
body[data-phosphor="white"] .screen {
  color: #d8d8d8;
}

.scanlines {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: repeating-linear-gradient(
    0deg,
    rgba(0, 0, 0, 0.18) 0px,
    rgba(0, 0, 0, 0.18) 1px,
    transparent 1px,
    transparent 3px
  );
  mix-blend-mode: multiply;
  opacity: 0.85;
  z-index: 50;
}

.vignette {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: radial-gradient(
    ellipse at center,
    transparent 55%,
    rgba(0, 0, 0, 0.55) 100%
  );
  z-index: 51;
}

.reflection {
  position: absolute;
  top: 0;
  left: 0;
  width: 35%;
  height: 100%;
  pointer-events: none;
  background: linear-gradient(
    105deg,
    rgba(255, 255, 255, 0.04) 0%,
    rgba(255, 255, 255, 0.07) 50%,
    transparent 100%
  );
  z-index: 52;
  transform: skewX(-10deg);
}

.caret {
  position: absolute;
  pointer-events: none;
  font-family: inherit;
  font-size: inherit;
  background: currentColor;
  color: currentColor;
  line-height: 1;
  z-index: 60;
  display: none;
  animation: blink 1.06s steps(2) infinite;
}

@keyframes blink {
  0%,
  49% {
    opacity: 1;
  }
  50%,
  100% {
    opacity: 0;
  }
}

/* =====================================================================
   4. LOTUS SURFACE — titlebar, grid, indicator, mode strip, key line
   ===================================================================== */

.lotus {
  flex: 1;
  display: grid;
  grid-template-rows: auto 1fr auto auto auto;
  width: 100%;
  height: 100%;
  font-size: clamp(10px, 1.55vmin, 16px);
  letter-spacing: 0;
  line-height: 1.05;
}

.lotus-titlebar {
  background: currentColor;
  color: #0a0904;
  padding: 2px 6px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 6px;
  text-transform: uppercase;
}

.titlebar-text {
  display: block;
  font-size: 1em;
  text-shadow: 0 0 1px rgba(255, 255, 255, 0.2);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.lotus-grid {
  background: #0a0904;
  color: inherit;
  overflow: hidden;
  position: relative;
  padding: 0;
  border: 0;
}

.lotus-indicator {
  background: #0a0904;
  color: inherit;
  border-top: 1px solid currentColor;
  border-bottom: 1px solid currentColor;
  display: grid;
  grid-template-columns: auto auto 1fr;
  align-items: center;
  padding: 1px 6px;
  font-size: 1em;
  white-space: nowrap;
  overflow: hidden;
}

.cell-coord {
  background: currentColor;
  color: #0a0904;
  padding: 0 4px;
  margin-right: 4px;
  font-weight: 700;
  letter-spacing: 0.2px;
  text-transform: uppercase;
}

.cell-sep {
  color: inherit;
  margin-right: 4px;
}

.cell-contents {
  color: inherit;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-weight: 500;
}

.lotus-mode {
  background: #0a0904;
  color: inherit;
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: 6px;
  padding: 1px 6px;
  font-size: 0.95em;
  white-space: nowrap;
  overflow: hidden;
}

.mode-label {
  background: currentColor;
  color: #0a0904;
  padding: 0 4px;
  font-weight: 700;
  letter-spacing: 0.4px;
  text-transform: uppercase;
}

.mode-menus {
  color: inherit;
  overflow: hidden;
  text-overflow: ellipsis;
}

.lotus-keys {
  background: #0a0904;
  color: inherit;
  padding: 1px 6px;
  display: grid;
  grid-template-columns: 1fr 1fr 1fr 1fr 1fr 1fr 1fr 1fr;
  gap: 6px;
  font-size: 0.93em;
  white-space: nowrap;
  overflow: hidden;
  text-transform: uppercase;
}

.lotus-keys .key-row {
  overflow: hidden;
  text-overflow: ellipsis;
}

/* ---- GRID ---- */

.grid-row {
  display: grid;
  position: relative;
}

.grid-row.header-row {
  background: #050401;
  color: inherit;
  border-bottom: 1px solid currentColor;
  font-weight: 600;
}

.grid-row.header-row .cell {
  text-align: center;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.col-header,
.row-header {
  background: #050401;
  color: inherit;
  font-weight: 600;
  user-select: none;
}

.row-header {
  text-align: right;
  padding: 0 3px;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  border-right: 1px solid currentColor;
}

.row-header.wide {
  background: #0a0904;
}

.cell {
  padding: 0 3px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: clip;
  border-right: 1px dotted rgba(255, 176, 0, 0.18);
  display: flex;
  align-items: center;
}

.cell.label {
  justify-content: flex-start;
}

.cell.number {
  justify-content: flex-end;
  font-variant-numeric: tabular-nums;
}

.cell.formula {
  justify-content: flex-end;
}

.cell.current {
  background: currentColor;
  color: #0a0904 !important;
  font-weight: 700;
}

.cell.in-range {
  background: rgba(255, 176, 0, 0.18);
}

body[data-phosphor="green"] .cell.in-range {
  background: rgba(108, 255, 90, 0.18);
}

.cell.anchor {
  outline: 1px dashed currentColor;
  outline-offset: -1px;
}

/* Chart overlay */
.chart-overlay {
  position: absolute;
  inset: 0;
  background: #0a0904;
  color: inherit;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 8px;
  z-index: 70;
}

.chart-frame {
  width: 100%;
  height: 100%;
  border: 1px solid currentColor;
  padding: 4px 6px;
  display: grid;
  grid-template-rows: auto 1fr auto;
  gap: 4px;
}

.chart-title {
  text-align: center;
  text-transform: uppercase;
  letter-spacing: 1px;
  border-bottom: 1px solid currentColor;
  padding-bottom: 2px;
  font-size: 0.95em;
}

.chart-hint {
  text-align: center;
  font-size: 0.85em;
  border-top: 1px solid currentColor;
  padding-top: 2px;
}

#chart-canvas {
  width: 100%;
  height: 100%;
  display: block;
  background: #0a0904;
  image-rendering: pixelated;
}

/* =====================================================================
   5. LEGEND (F-key hints) and soft-keys
   ===================================================================== */

.legend {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border-radius: 10px;
  background: linear-gradient(180deg, #b9a372 0%, #9c8452 100%);
  color: #2a2010;
  font-size: 14px;
  font-family: "IBM Plex Mono", "VT323", monospace;
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.5),
    inset 0 -2px 0 rgba(0, 0, 0, 0.25),
    0 0 0 1px rgba(0, 0, 0, 0.5);
  max-width: 100%;
  overflow-x: auto;
  margin-bottom: 8px;
  white-space: nowrap;
}

.legend-title {
  text-transform: uppercase;
  font-weight: 700;
  letter-spacing: 0.6px;
  padding: 2px 6px;
  background: #2a2010;
  color: #d8c8a3;
  border-radius: 3px;
}

.legend-keys {
  display: flex;
  gap: 12px;
  align-items: center;
}

.legend-keys .key {
  background: #2a2010;
  color: #d8c8a3;
  border-radius: 3px;
  padding: 2px 6px;
  font-weight: 600;
  letter-spacing: 0.4px;
  text-transform: uppercase;
  font-size: 12px;
}

.softkeys {
  display: none;
  width: 100%;
  gap: 6px;
  padding: 6px 4px 8px;
  overflow-x: auto;
}

.softkey {
  flex: 0 0 auto;
  font-family: inherit;
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  padding: 8px 12px;
  border-radius: 6px;
  background: linear-gradient(180deg, #d8c8a3, #b9a372);
  color: #2a2010;
  border: none;
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.5),
    0 1px 2px rgba(0, 0, 0, 0.5);
}

.softkey:active {
  transform: translateY(1px);
}

/* =====================================================================
   6. RESPONSIVE — stack the room on small viewports, switch to soft-keys
   ===================================================================== */

@media (max-width: 880px) {
  body {
    font-size: 14px;
  }
  .room {
    grid-template-columns: 1fr;
    gap: 14px;
    align-items: center;
    padding: 14px 8px 0;
  }
  .monitor,
  .tower {
    max-width: 100%;
  }
  .tower {
    max-width: 200px;
    justify-self: center;
  }
  .legend {
    display: none;
  }
  .softkeys {
    display: flex;
  }
  .lotus-keys {
    grid-template-columns: 1fr 1fr 1fr 1fr;
    font-size: 0.88em;
  }
}

@media (max-width: 560px) {
  .monitor-casing {
    padding: 18px 18px 10px;
  }
  .bezel {
    padding: 10px;
    aspect-ratio: 5 / 4;
  }
  .lotus-keys {
    grid-template-columns: 1fr 1fr;
  }
  .grid-row {
    grid-template-columns: 28px repeat(8, 1fr);
  }
  .col-header:first-child,
  .row-header {
    width: 28px;
    min-width: 28px;
  }
}

/* Focus / accessibility */
.screen:focus-visible,
.lotus :focus-visible {
  outline: 2px solid currentColor;
  outline-offset: -2px;
}

.softkey:focus {
  outline: 2px solid #ffb000;
}

/* Fix: monitor takes the wide column, the XT tower sits to its right (DOM order put the tower first). */
@media (min-width: 881px) {
  .room > .monitor { grid-column: 1; grid-row: 1; justify-self: center; }
  .room > .tower   { grid-column: 2; grid-row: 1; }
}
/* Fix: the Graph overlay is display:flex, which overrode [hidden]. */
.chart-overlay[hidden] { display: none; }
/* Fix: inverse-video blocks used `background: currentColor` next to `color: #0a0904`,
   so currentColor resolved to the dark text color and the title bar, cell pointer,
   cell address and mode indicator all rendered dark-on-dark. Use the phosphor color. */
body[data-phosphor="amber"] .screen { --phosphor: #ffb000; }
body[data-phosphor="green"] .screen { --phosphor: #6cff5a; }
body[data-phosphor="white"] .screen { --phosphor: #d8d8d8; }
.lotus-titlebar, .cell-coord, .mode-label, .cell.current { background: var(--phosphor, #ffb000); }
/* Fix: the 20 rows sat in the top half of the screen with the rest blank; spread header + 20 rows over the full grid area. */
.lotus-grid { display: grid; grid-template-rows: repeat(21, 1fr); }

/* F-key bar: real buttons (click/tap), same handler as the keyboard. */
.legend { flex-wrap: wrap; justify-content: center; max-width: calc(100vw - 72px); }
.legend-keys { flex-wrap: wrap; gap: 6px; justify-content: center; }
.fkey {
  font: inherit; font-size: 12px; display: inline-flex; align-items: center; gap: 5px;
  padding: 3px 7px 3px 3px; border-radius: 4px; cursor: pointer;
  background: linear-gradient(180deg, #d8c8a3, #b9a372); color: #2a2010;
  border: 1px solid #6b5a33;
  box-shadow: inset 0 1px 0 rgba(255,255,255,.5), 0 1px 2px rgba(0,0,0,.5);
  touch-action: manipulation;
}
.fkey:hover { background: linear-gradient(180deg, #e6d8b5, #c4ae7c); }
.fkey:active { transform: translateY(1px); box-shadow: inset 0 1px 2px rgba(0,0,0,.4); }
.fkey:focus-visible { outline: 2px solid #ffb000; outline-offset: 1px; }
.fkey .key { color: #ffb000 !important; text-shadow: 0 0 4px rgba(255,176,0,.6); }
body[data-phosphor="green"] .fkey .key { color: #6cff5a !important; text-shadow: 0 0 4px rgba(108,255,90,.6); }
.fkey-label { font-weight: 600; }
@media (max-width: 880px) {
  .legend { display: flex; padding: 6px 8px; width: 100%; max-width: none; }
  .legend-title { display: none; }
  .legend-keys { flex-wrap: nowrap; overflow-x: auto; justify-content: flex-start; width: 100%; }
  .fkey { flex: 0 0 auto; font-size: 11px; padding: 7px 7px 7px 4px; }
  .room > .tower { display: none; } /* decorative; gives the screen the room on phones */
}