/* ────────────────────────────────────────────────────────────────
   Hex Viewer — Terminal dark theme
   ──────────────────────────────────────────────────────────────── */

:root {
  --bg:         #0d1117;
  --bg-panel:   #161b22;
  --bg-panel2:  #1c2128;
  --border:     #30363d;
  --text:       #e6edf3;
  --text-dim:   #7d8590;
  --text-muted: #484f58;
  --accent:     #58a6ff;
  --accent2:    #3fb950;
  --warn:       #f0883e;
  --danger:     #f85149;
  --offset:     #8b949e;
  --hex-byte:   #cdd9e5;
  --ascii:      #a5d6ff;
  --sel-bg:     rgba(88, 166, 255, 0.18);
  --sel-border: rgba(88, 166, 255, 0.5);
  --match-bg:   rgba(255, 204, 0, 0.18);
  --match-border: rgba(255, 204, 0, 0.5);
  --match-active-bg:    rgba(255, 150, 0, 0.35);
  --match-active-border: #ff9600;
  --font-mono:  "JetBrains Mono", "Fira Code", "Cascadia Code", "Consolas", "Menlo", monospace;
  --font-ui:    -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --radius:     6px;
  --radius-sm:  4px;
}

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

html, body {
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-ui);
  font-size: 14px;
  line-height: 1.5;
}

/* ── Layout ── */

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

.top-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px 16px;
  background: var(--bg-panel);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.top-bar h1 {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.5px;
}

.top-bar .subtitle {
  font-size: 12px;
  color: var(--text-dim);
}

.top-bar .spacer { flex: 1; }

.main {
  display: flex;
  flex: 1;
  overflow: hidden;
}

/* ── Sidebar ── */

.sidebar {
  width: 240px;
  flex-shrink: 0;
  background: var(--bg-panel);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 0;
  overflow-y: auto;
}

.sidebar-section {
  padding: 12px 14px;
  border-bottom: 1px solid var(--border);
}

.sidebar-section h3 {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.6px;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 8px;
}

.info-row {
  display: flex;
  gap: 6px;
  font-size: 12px;
  margin-bottom: 4px;
  overflow: hidden;
}

.info-row .label {
  color: var(--text-dim);
  min-width: 56px;
  flex-shrink: 0;
}

.info-row .value {
  color: var(--text);
  word-break: break-all;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* ── Search ── */

.search-row {
  display: flex;
  gap: 4px;
  margin-bottom: 6px;
}

.search-input {
  flex: 1;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 12px;
  padding: 4px 8px;
  outline: none;
  min-width: 0;
}

.search-input:focus { border-color: var(--accent); }

.btn-group {
  display: flex;
  gap: 2px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
  background: var(--bg-panel2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: 12px;
  font-family: var(--font-ui);
  padding: 4px 10px;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
  white-space: nowrap;
}

.btn:hover { background: var(--border); }
.btn:disabled { opacity: 0.4; cursor: not-allowed; }
.btn.active { background: var(--accent); color: #0d1117; border-color: var(--accent); font-weight: 600; }
.btn.accent { background: var(--accent); color: #0d1117; border-color: var(--accent); font-weight: 600; }
.btn.accent:hover { filter: brightness(1.1); }
.btn.danger { color: var(--danger); border-color: var(--danger); }
.btn.danger:hover { background: var(--danger); color: #fff; }
.btn.small { padding: 3px 7px; font-size: 11px; }

.search-nav {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}

.search-count {
  font-size: 11px;
  color: var(--text-dim);
  flex: 1;
}

/* ── Selection ── */

.sel-info {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-dim);
  margin-bottom: 6px;
  min-height: 16px;
  word-break: break-all;
}

.sel-actions {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
}

/* ── Controls ── */

.control-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 6px;
  font-size: 12px;
}

.control-row label { color: var(--text-dim); min-width: 52px; }

select.input-sm {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: 12px;
  padding: 3px 6px;
  outline: none;
}
select.input-sm:focus { border-color: var(--accent); }

.input-sm-text {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 12px;
  padding: 3px 8px;
  width: 100px;
  outline: none;
}
.input-sm-text:focus { border-color: var(--accent); }

/* ── Drop zone ── */

#dropzone {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  cursor: pointer;
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  margin: 20px;
  padding: 40px;
  transition: border-color 0.2s, background 0.2s;
  user-select: none;
}

#dropzone.drag-over {
  border-color: var(--accent);
  background: rgba(88, 166, 255, 0.05);
}

#dropzone .drop-icon {
  font-size: 48px;
  opacity: 0.5;
}

#dropzone .drop-label {
  font-size: 16px;
  color: var(--text-dim);
}

#dropzone .drop-hint {
  font-size: 12px;
  color: var(--text-muted);
}

/* ── Viewer panel ── */

#viewer-panel {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  font-family: var(--font-mono);
}

#viewer-panel.hidden { display: none; }

/* ── Hex viewport (virtual scroll) ── */

#hex-viewport {
  flex: 1;
  overflow-y: auto;
  overflow-x: auto;
  position: relative;
  scrollbar-color: var(--border) transparent;
  scrollbar-width: thin;
}

#hex-viewport::-webkit-scrollbar { width: 8px; }
#hex-viewport::-webkit-scrollbar-track { background: transparent; }
#hex-viewport::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }

#scroll-spacer {
  width: 1px;
  position: absolute;
  top: 0;
  left: 0;
  pointer-events: none;
}

/* ── Hex Table ── */

#hex-table-wrap {
  position: relative;
}

table.hex-table {
  border-collapse: collapse;
  width: 100%;
  position: absolute;
  top: 0;
  left: 0;
}

.hex-table-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--bg-panel);
  border-bottom: 1px solid var(--border);
  font-size: 11px;
  color: var(--text-muted);
  user-select: none;
}

.hex-table-header th {
  padding: 4px 8px;
  text-align: left;
  font-weight: 600;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.hex-table-header .col-offset { min-width: 90px; }
.hex-table-header .col-hex { }
.hex-table-header .col-ascii { }

table.hex-table tr {
  height: 22px;
}

table.hex-table td {
  padding: 0 8px;
  vertical-align: middle;
  white-space: nowrap;
  line-height: 22px;
  font-size: 13px;
}

.col-offset {
  color: var(--offset);
  user-select: none;
  min-width: 90px;
}

.col-hex {
  color: var(--hex-byte);
  letter-spacing: 0.5px;
}

.col-ascii {
  color: var(--ascii);
}

.hex-byte {
  display: inline-block;
  width: 22px;
  text-align: center;
  cursor: pointer;
  border-radius: 2px;
  transition: background 0.1s;
  user-select: none;
}

.hex-byte:hover { background: rgba(255,255,255,0.1); }
.hex-byte.hex-empty { opacity: 0; }

.hex-gap {
  display: inline-block;
  width: 8px;
}

.ascii-byte {
  display: inline-block;
  width: 9px;
  text-align: center;
  cursor: pointer;
  border-radius: 1px;
  user-select: none;
  transition: background 0.1s;
}

.ascii-byte:hover { background: rgba(255,255,255,0.1); }

/* ── Highlights ── */

.hex-byte.selected,
.ascii-byte.selected {
  background: var(--sel-bg);
  outline: 1px solid var(--sel-border);
}

.hex-byte.match,
.ascii-byte.match {
  background: var(--match-bg);
  outline: 1px solid var(--match-border);
}

.hex-byte.match-active,
.ascii-byte.match-active {
  background: var(--match-active-bg);
  outline: 1px solid var(--match-active-border);
}

/* ── Edit modal ── */

.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.6);
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
}

.modal-overlay.hidden { display: none; }

.modal-box {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 24px;
  min-width: 260px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  box-shadow: 0 8px 32px rgba(0,0,0,0.5);
}

.modal-box h2 {
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
}

.modal-box .offset-label {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--accent);
}

.modal-box input {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 14px;
  padding: 6px 10px;
  width: 100%;
  outline: none;
  text-transform: uppercase;
}

.modal-box input:focus { border-color: var(--accent); }

.modal-actions {
  display: flex;
  gap: 8px;
  justify-content: flex-end;
}

/* ── Toast ── */

#toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(10px);
  background: var(--accent);
  color: #0d1117;
  padding: 6px 18px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s, transform 0.2s;
  z-index: 200;
}

#toast.visible {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ── Scrollbar ── */

.sidebar::-webkit-scrollbar { width: 6px; }
.sidebar::-webkit-scrollbar-track { background: transparent; }
.sidebar::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }

/* ── Utilities ── */

.hidden { display: none !important; }
.flex-row { display: flex; gap: 6px; align-items: center; }

/* ── Responsive ── */

@media (max-width: 640px) {
  .sidebar { width: 200px; }
  .hex-byte { width: 20px; }
  .ascii-byte { width: 8px; }
}