:root {
  --bg: #ffffff;
  --bg-alt: #f4f5f7;
  --fg: #1a1a1a;
  --fg-muted: #6b7280;
  --border: #d9dce1;
  --accent: #2563eb;
  --accent-fg: #ffffff;
  --highlight: #fde68a;
  --row-alt: #f8f9fb;
}

:root[data-theme="dark"] {
  --bg: #14161a;
  --bg-alt: #1d2026;
  --fg: #e6e8eb;
  --fg-muted: #9aa1ab;
  --border: #2c3038;
  --accent: #5b8def;
  --accent-fg: #0b0d10;
  --highlight: #8a6d1a;
  --row-alt: #191c22;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #14161a;
    --bg-alt: #1d2026;
    --fg: #e6e8eb;
    --fg-muted: #9aa1ab;
    --border: #2c3038;
    --accent: #5b8def;
    --accent-fg: #0b0d10;
    --highlight: #8a6d1a;
    --row-alt: #191c22;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--fg);
}

.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border);
}

.app-header h1 {
  font-size: 1.25rem;
  margin: 0;
}

.icon-button {
  min-width: 44px;
  min-height: 44px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg-alt);
  color: var(--fg);
  font-size: 1.1rem;
  cursor: pointer;
}

.tab-bar {
  display: flex;
  gap: 0.25rem;
  padding: 0.5rem 1.25rem 0;
  border-bottom: 1px solid var(--border);
  overflow-x: auto;
}

.tab-button {
  min-height: 44px;
  padding: 0.5rem 1rem;
  border: none;
  background: none;
  color: var(--fg-muted);
  font-size: 0.95rem;
  cursor: pointer;
  border-bottom: 3px solid transparent;
  white-space: nowrap;
}

.tab-button[aria-selected="true"] {
  color: var(--fg);
  border-bottom-color: var(--accent);
  font-weight: 600;
}

main {
  padding: 1.25rem;
  max-width: 1000px;
  margin: 0 auto;
}

.tab-panel[hidden] {
  display: none;
}

label {
  display: block;
  margin-bottom: 0.35rem;
  font-weight: 600;
  color: var(--fg-muted);
  font-size: 0.9rem;
}

#search-input,
textarea {
  width: 100%;
  padding: 0.65rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg-alt);
  color: var(--fg);
  font-size: 1rem;
  font-family: inherit;
}

textarea {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  resize: vertical;
  margin-bottom: 1rem;
}

#search-input {
  margin-bottom: 1rem;
  min-height: 44px;
}

.table-scroll {
  overflow-x: auto;
}

table {
  width: 100%;
  table-layout: fixed;
  border-collapse: collapse;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.9rem;
}

.col-dec,
.col-hex {
  width: 3.25rem;
}

.col-char {
  width: 4rem;
}

.col-oct {
  width: 3.75rem;
}

.col-bin {
  width: 7.5rem;
}

.col-description {
  width: auto;
}

thead th,
tbody td {
  padding-left: 0.5rem;
  padding-right: 0.5rem;
}

tbody td {
  white-space: nowrap;
}

td[data-label="Description"] {
  white-space: normal;
}

thead th {
  position: sticky;
  top: 0;
  background: var(--bg-alt);
  text-align: left;
  padding: 0.6rem 0.75rem;
  border-bottom: 2px solid var(--border);
  font-family: system-ui, sans-serif;
  font-weight: 600;
  white-space: nowrap;
}

thead th.sortable {
  cursor: pointer;
  user-select: none;
}

thead th.char-header {
  text-align: center;
}

thead th.sortable:hover {
  color: var(--accent);
}

.sort-indicator {
  display: inline-block;
  width: 0.9em;
  color: var(--accent);
}

tbody td {
  padding: 0.45rem 0.75rem;
  border-bottom: 1px solid var(--border);
}

tbody tr:nth-child(even) {
  background: var(--row-alt);
}

.char-cell {
  font-weight: 700;
  text-align: center;
}

.no-results {
  color: var(--fg-muted);
  padding: 1rem 0;
}

.convert-output-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.35rem;
}

.convert-output-header label {
  margin-bottom: 0;
}

.byte-count {
  color: var(--fg-muted);
  font-size: 0.85rem;
  margin-left: auto;
}

#hex2text-error:not(:empty) {
  color: #dc2626;
}

.small-button {
  min-height: 36px;
  padding: 0.35rem 0.85rem;
  border-radius: 6px;
  border: 1px solid var(--accent);
  background: var(--accent);
  color: var(--accent-fg);
  font-size: 0.85rem;
  cursor: pointer;
}

.hexdump-panes {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.hexdump-pane h2 {
  font-size: 0.9rem;
  color: var(--fg-muted);
  margin: 0 0 0.5rem;
}

.byte-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0.15rem;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.9rem;
  padding: 0.75rem;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 8px;
  min-height: 3rem;
}

.byte-grid span {
  display: inline-block;
  min-width: 1.6em;
  text-align: center;
  padding: 0.1rem 0.15rem;
  border-radius: 4px;
  cursor: default;
}

.byte-grid span.highlight {
  background: var(--highlight);
  color: #1a1a1a;
}

@media (max-width: 700px) {
  main {
    padding: 0.75rem;
  }

  .hexdump-panes {
    grid-template-columns: 1fr;
  }

  table {
    font-size: 0.72rem;
  }

  thead th {
    padding: 0.35rem 0.4rem;
    font-size: 0.68rem;
  }

  tbody td {
    padding: 0.3rem 0.4rem;
    white-space: nowrap;
  }

  td[data-label="Description"] {
    white-space: normal;
  }

  .col-dec,
  .col-hex {
    width: 2.75rem;
  }

  .col-char {
    width: 3rem;
  }

  .col-oct {
    width: 3rem;
  }

  .col-bin {
    width: 5rem;
  }
}