:root {
  /* Solarized Palette */
  --base03: #002b36;
  --base02: #073642;
  --base01: #586e75;
  --base00: #657b83;
  --base0: #839496;
  --base1: #93a1a1;
  --base2: #eee8d5;
  --base3: #fdf6e3;
  --yellow: #b58900;
  --orange: #cb4b16;
  --red: #dc322f;
  --magenta: #d33682;
  --violet: #6c71c4;
  --blue: #268bd2;
  --cyan: #2aa198;
  --green: #859900;

  /* Thematic Variables */
  --bg-primary: var(--base03);
  --bg-secondary: var(--base02);
  --text-primary: var(--base0);
  --text-secondary: var(--base1);
  --border-primary: var(--base01);
  --accent-primary: var(--cyan);
  --accent-secondary: var(--orange);
  --accent-tertiary: var(--yellow);
  --accent-link: var(--blue);
}

body.light-theme {
  --bg-primary: var(--base3);
  --bg-secondary: var(--base2);
  --text-primary: var(--base00);
  --text-secondary: var(--base01);
  --border-primary: var(--base0);
  --accent-primary: var(--green);
  --accent-secondary: var(--magenta);
  --accent-tertiary: var(--violet);
  --accent-link: var(--blue);
}

body {
  font-family: "monoidregular", "Roboto", "Inter", sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  margin: 0;
  padding: 1rem;
  box-sizing: border-box;
  height: 96vh;
  width: 96vw;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.icon {
  margin-right: 0.2em;
}

.controls {
  position: absolute;
  top: 1.8em;
  left: 1.8em;
  padding-bottom: 1rem;
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  transition: opacity 0.3s ease-in-out;
  z-index: 100000;
}

.controls.hidden {
  opacity: 0;
  pointer-events: none;
}

.btn {
  background-color: var(--bg-secondary);
  color: var(--text-secondary);
  border: 1px solid var(--border-primary);
  padding: 0.5rem 1rem;
  border-radius: 0.5rem;
  cursor: pointer;
  font-family: inherit;
  transition: background-color 0.2s;
}

.btn:hover {
  background-color: var(--border-primary);
  color: var(--base3);
}

#main-container {
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  position: relative;
}

.quadrant-grid {
  display: grid;
  flex-grow: 1;
  position: relative;
}

.quadrant {
  border: 2px dotted var(--accent-primary);
  border-radius: 0.5rem;
  position: relative;
  min-height: 100px;
}

.quadrant-grid .quadrant {
  border: 1px solid var(--accent-tertiary);
  border-radius: 1px;
}

.column-headers,
.row-headers {
  display: grid;
}

.column-headers {
  grid-auto-flow: column;
}

.row-headers {
  grid-auto-flow: row;
}

.header-cell {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0.5rem;
}

.header-input {
  color: var(--accent-secondary);
  font-size: 1.25rem;
  padding: 0.25rem 0.5rem;
  outline: none;
  background-color: transparent;
  border: none;
  text-align: center;
  border-radius: 0.25rem;
}

.header-input:empty {
  background-color: rgba(181, 137, 0, 0.1); /* sepia-like */
  filter: sepia(0.3);
}

.header-input:focus {
  background-color: var(--bg-secondary);
}

.row-headers .header-input {
  /* Rotation */
  writing-mode: vertical-rl;
  transform: rotate(180deg);

  /* Flexbox for icon alignment */
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5em;
}

.row-headers .header-input .iconoir {
  margin-right: 0;
}
.content-area {
  display: flex;
  flex-grow: 1;
  position: relative;
}

.grid-and-rows {
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.add-btn {
  position: absolute;
  width: 24px;
  height: 24px;
  background-color: transparent;
  color: var(--accent-primary);
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  user-select: none;
  transition: all 0.2s;
  z-index: 10;
}

.add-btn:hover {
  transform: scale(1.1);
}

#add-col-btn {
  top: -12px;
  right: -12px;
  border-top: 2px solid var(--accent-primary);
  border-right: 2px solid var(--accent-primary);
}

#add-row-btn {
  bottom: -12px;
  right: -12px;
  border-bottom: 2px solid var(--accent-primary);
  border-right: 2px solid var(--accent-primary);
}

.item {
  position: absolute;
  background-color: transparent;
  color: var(--accent-primary);
  padding: 0.5rem;
  border-radius: 0.5rem;
  border: 1px solid transparent;
  cursor: move;
  touch-action: none;
  user-select: none;
  min-width: 50px;
  z-index: 20;
  transition:
    background-color 0.2s ease-in-out,
    color 0.2s ease-in-out,
    border-color 0.2s ease-in-out,
    filter 0.2s ease-in-out;
  filter: drop-shadow(2px 2px 2px rgba(0, 0, 0, 0.5));
}

.item:hover {
  transform: scale(1.02);
  filter: drop-shadow(4px 4px 4px rgba(0, 0, 0, 0.5));
}

.item a,
.item a:visited {
  color: inherit;
  text-decoration: none;
  display: block;
  border-bottom: 1px dashed var(--accent-link);
}

.item a:hover {
  text-decoration: none;
  border-bottom: 1px solid var(--accent-link);
}

.item .edit-area {
  cursor: text;
  outline: none;
}

.item.selected {
  box-shadow: 0 0 10px var(--accent-primary);
  border: 1px solid var(--accent-primary);
}

.item.marked {
  background-color: var(--bg-secondary);
  border: 1px solid var(--accent-secondary);
  color: var(--accent-secondary);
  filter: sepia(0.2);
}

.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.7);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 100001;
}

.modal-content {
  background-color: var(--bg-secondary);
  padding: 2rem;
  border-radius: 0.5rem;
  border: 1px solid var(--border-primary);
  text-align: center;
}

.modal-buttons {
  margin-top: 1rem;
  display: flex;
  gap: 1rem;
  justify-content: center;
}

.modal-input {
  display: block;
  width: 100%;
  padding: 0.5rem;
  margin-top: 1rem;
  border-radius: 0.25rem;
  border: 1px solid var(--border-primary);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: inherit;
}

.info-hover {
  position: absolute;
  background-color: var(--bg-secondary);
  color: var(--text-primary);
  padding: 0.5rem;
  border-radius: 0.5rem;
  border: 1px solid var(--border-primary);
  z-index: 100002;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.1s ease-in-out;
}

.info-hover.visible {
  opacity: 1;
}

.item-checkbox {
  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: none;
  width: 1.2em;
  height: 1.2em;
  border: 2px solid var(--border-primary);
  border-radius: 0.25em;
  background-color: var(--bg-primary);
  vertical-align: middle;
  cursor: pointer;
  position: relative;
  margin-right: 0.5em;
  flex-shrink: 0;
}

.item-checkbox:checked {
  background-color: var(--accent-primary);
  border-color: var(--accent-primary);
}

.item-checkbox:checked::after {
  content: "";
  position: absolute;
  left: 0.35em;
  top: 0.1em;
  width: 0.3em;
  height: 0.6em;
  border: solid var(--bg-primary);
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}

.alignment-line {
  position: absolute;
  background-color: var(--magenta);
  opacity: 0.7;
  z-index: 99999;
  pointer-events: none;
}

.alignment-line[style*="height: 1px"] {
  border-top: 1px dashed var(--magenta);
  background-color: transparent;
}

.alignment-line[style*="width: 1px"] {
  border-left: 1px dashed var(--magenta);
  background-color: transparent;
}