:root {
  --bg:      #3F3F3F;
  --panel:   #2B2B2B;
  --border:  #5F5F5F;
  --accent:  #8CD0D3;
  --accent2: #5F7F5F;
  --dim:     #5F5F5F;
  --text:    #DCDCCC;
  --muted:   #7F9F7F;
  --warn:    #F0DFAF;
  --err:     #CC9393;
  --mono:    'Courier New', monospace;
  --sans:    system-ui, 'Liberation Sans', sans-serif;
}

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

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--mono);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* scanline effect removed for zenburn theme */

/* ── Header ── */
header {
  border-bottom: 1px solid var(--border);
  padding: 1rem 2rem;
  display: flex; align-items: center; gap: 1.5rem;
  background: var(--panel);
}
header h1 {
  font-family: var(--sans); font-weight: 800; font-size: 1.5rem;
  letter-spacing: 0.14em; color: #F0E68C;
  text-shadow: none;
}
header .sub { font-size: 0.68rem; color: var(--muted); letter-spacing: 0.08em; text-transform: uppercase; }
header .tagline { margin-left: auto; font-size: 0.62rem; color: var(--dim); letter-spacing: 0.05em; }

/* ── Main layout ── */
main {
  flex: 1; max-width: 1440px; margin: 0 auto; width: 100%;
  padding: 1.5rem 2rem;
  display: flex; flex-direction: column; gap: 1rem;
}

/* ── Toolbar ── */
.toolbar {
  background: var(--panel);
  border: 1px solid var(--border);
  padding: 0.85rem 1rem;
  display: flex; align-items: flex-end; gap: 1rem; flex-wrap: wrap;
}
.toolbar.sub-toolbar {
  border-top: none;
  padding-top: 0.6rem; padding-bottom: 0.6rem;
  background: #333333;
}

.field { display: flex; flex-direction: column; gap: 0.25rem; }
label { font-size: 0.58rem; color: var(--muted); letter-spacing: 0.1em; text-transform: uppercase; }
.field-hint { font-size: 0.55rem; color: var(--dim); font-style: italic; max-width: 14em; line-height: 1.3; }

/* codebook status badge */
.cb-status {
  font-size: 0.65rem; color: var(--dim); align-self: center;
  display: flex; align-items: center; gap: 0.4em;
}
.cb-source {
  font-size: 0.6rem; font-weight: bold; letter-spacing: 0.06em;
  padding: 0.15em 0.5em; border-radius: 3px;
  text-transform: uppercase;
}
.cb-status.generated .cb-source { background: var(--accent2); color: var(--text); }
.cb-status.imported  .cb-source { background: var(--warn); color: var(--panel); }
.cb-status #cb-info  { color: var(--muted); }
.cb-status #cb-count { color: var(--accent); }

input[type="text"], input[type="password"], select {
  background: var(--bg); border: 1px solid var(--border);
  color: var(--accent); font-family: var(--mono); font-size: 0.82rem;
  padding: 0.44rem 0.7rem; outline: none; letter-spacing: 0.04em;
  transition: border-color 0.15s, box-shadow 0.15s;
}
input:focus, select:focus {
  border-color: var(--accent);
  box-shadow: none;
}
select { cursor: pointer; color: var(--text); }
select option { background: var(--panel); }

input#cb-seed    { width: 170px; }
input#passphrase { width: 148px; border-right: none; }

.pass-wrap { display: flex; align-items: stretch; }
.pass-toggle {
  background: var(--bg); border: 1px solid var(--border); border-left: none;
  color: var(--muted); cursor: pointer; padding: 0 0.5rem;
  font-size: 0.8rem; line-height: 1; transition: color 0.14s;
  display: flex; align-items: center;
}
.pass-toggle:hover { color: var(--accent); border-color: var(--accent2); }

/* ── Mode toggle ── */
.mode-toggle { display: flex; border: 1px solid var(--border); }
.mode-toggle button {
  border: none; border-radius: 0;
  font-family: var(--mono); font-size: 0.7rem;
  letter-spacing: 0.08em; text-transform: uppercase;
  padding: 0.44rem 1rem; cursor: pointer;
  background: transparent; color: var(--muted);
  transition: background 0.15s, color 0.15s;
}
.mode-toggle button.active { background: var(--accent2); color: var(--accent); }
.mode-toggle button:hover:not(.active) { color: var(--text); }

/* Null controls (toggle + density dropdown inline) */
.null-controls { display: flex; align-items: stretch; gap: 0.4rem; }
.null-controls select {
  font-size: 0.65rem; padding: 0.3rem 0.4rem;
}
.null-controls select:disabled { opacity: 0.35; cursor: default; }

/* ── Buttons ── */
button {
  font-family: var(--mono); font-size: 0.72rem;
  letter-spacing: 0.09em; text-transform: uppercase;
  padding: 0.44rem 1rem; border: 1px solid var(--border);
  background: transparent; color: var(--text); cursor: pointer;
  transition: all 0.14s; white-space: nowrap;
}
button:hover { border-color: var(--dim); color: var(--accent); }
button.primary { background: var(--accent2); color: var(--text); border-color: var(--muted); font-weight: 700; }
button.primary:hover { background: var(--muted); color: var(--panel); }
button.ghost { border-color: var(--accent2); color: var(--accent); }
button.ghost:hover { background: rgba(127,159,127,0.15); }
button.warn-btn { border-color: #8F6F4F; color: var(--warn); }
button.warn-btn:hover { background: rgba(240,223,175,0.1); }

.btn-row { display: flex; gap: 0.5rem; margin-left: auto; align-items: flex-end; }

/* ── IO panels ── */
.io-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 1rem;
}
.panel {
  background: var(--panel); border: 1px solid var(--border);
  display: flex; flex-direction: column; min-height: 300px;
}
.panel-hdr {
  display: flex; align-items: center; gap: 0.6rem;
  padding: 0.5rem 0.9rem; border-bottom: 1px solid var(--border);
  background: #333333;
}
.panel-lbl { font-size: 0.6rem; color: var(--muted); letter-spacing: 0.12em; text-transform: uppercase; }
.panel-badge { margin-left: auto; font-size: 0.57rem; color: var(--dim); }
.dot { width: 6px; height: 6px; border-radius: 50%; background: var(--dim); flex-shrink: 0; }
.dot.on { background: var(--accent); }

textarea {
  flex: 1; background: transparent; border: none; resize: none; outline: none;
  color: var(--text); font-family: var(--mono); font-size: 0.82rem;
  line-height: 1.75; padding: 0.9rem; letter-spacing: 0.02em;
}
textarea::placeholder { color: var(--dim); }
textarea.encoded { color: var(--accent); letter-spacing: 0.05em; word-break: break-all; }

.copy-btn {
  font-size: 0.58rem; padding: 0.2rem 0.5rem;
  border: 1px solid var(--border); background: transparent;
  color: var(--muted); cursor: pointer; letter-spacing: 0.07em; text-transform: uppercase;
}
.copy-btn:hover { color: var(--accent); border-color: var(--accent2); }

/* ── Simple counts strip (below IO grid) ── */
.counts-strip {
  display: flex; align-items: center; gap: 0;
  background: var(--panel); border: 1px solid var(--border); border-top: none;
  font-size: 0.63rem; color: var(--muted); letter-spacing: 0.05em;
}
.count-cell {
  display: flex; flex-direction: column; align-items: center;
  padding: 0.35rem 0.9rem; gap: 0.1rem;
  border-right: 1px solid var(--border);
  cursor: default; position: relative;
}
.count-cell:last-child { border-right: none; margin-left: auto; padding-right: 1.2rem; }
.count-cell .cv { color: var(--accent); font-size: 0.8rem; }
.count-cell .cl { font-size: 0.56rem; text-transform: uppercase; letter-spacing: 0.09em; }
.count-cell .in-out { display: flex; width: 100%; justify-content: space-between; gap: 2rem; }
.count-cell .in-out span { font-size: 0.7rem; }
/* Tooltip — bounded width with wrapping; alignment shifts for edge cells so
   the tip doesn't escape the viewport. white-space:normal lets the content
   wrap inside the box; max-width prevents the box from getting too wide; the
   :first-child and :last-child rules anchor edge tooltips to the cell's
   own edge instead of centering them. */
.count-cell[data-tip]:hover::after {
  content: attr(data-tip);
  position: absolute; bottom: calc(100% + 6px); left: 50%; transform: translateX(-50%);
  background: #383838; border: 1px solid var(--border);
  color: var(--text); font-size: 0.65rem; letter-spacing: 0.03em;
  padding: 0.5rem 0.75rem; z-index: 100;
  pointer-events: none; line-height: 1.45;
  white-space: pre-wrap;          /* honor explicit newlines, allow wrapping */
  max-width: min(22em, 80vw);     /* never wider than 22em or 80% of viewport */
  width: max-content;             /* shrink to content up to the max-width */
  text-align: left;
}
.count-cell[data-tip]:first-child:hover::after {
  left: 0; transform: none;       /* anchor to left edge of the leftmost cell */
}
.count-cell[data-tip]:last-child:hover::after {
  left: auto; right: 0; transform: none;  /* anchor to right edge of last cell */
}

/* ── Encoding trace panel ── */
.trace-panel {
  border: 1px solid var(--border); background: var(--panel);
}
.trace-summary {
  padding: 0.55rem 1rem; font-size: 0.62rem; color: var(--muted);
  letter-spacing: 0.1em; text-transform: uppercase;
  cursor: pointer; user-select: none;
  display: flex; align-items: center; gap: 0.5rem;
  list-style: none;
}
.trace-summary::-webkit-details-marker { display: none; }
.trace-summary::before {
  content: '▶'; font-size: 0.48rem; color: var(--dim); transition: transform 0.18s;
}
details.trace-panel[open] .trace-summary::before { transform: rotate(90deg); }
.trace-note { margin-left: auto; font-size: 0.6rem; color: var(--dim); font-style: italic; }

.trace-tabs { display: flex; border-bottom: 1px solid var(--border); }
.trace-tab {
  padding: 0.38rem 1rem; font-size: 0.62rem; letter-spacing: 0.08em;
  text-transform: uppercase; cursor: pointer; color: var(--muted);
  border-bottom: 2px solid transparent; margin-bottom: -1px;
  transition: color 0.14s; position: relative;
}
.trace-tab.active { color: var(--accent); border-bottom-color: var(--accent); }
.trace-tab:hover:not(.active) { color: var(--text); }
.trace-tab .tc { /* count badge */
  font-size: 0.55rem; color: var(--dim); margin-left: 0.3rem;
}
.trace-tab.active .tc { color: var(--accent2); }

.trace-sort {
  margin-left: auto; padding: 0.38rem 0.7rem;
  font-size: 0.6rem; letter-spacing: 0.06em;
  color: var(--muted); cursor: pointer;
  transition: color 0.14s;
}
.trace-sort:hover { color: var(--accent); }
.trace-sort.active { color: var(--accent); }

.trace-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(260px,1fr));
  max-height: 220px; overflow-y: auto; font-size: 0.67rem;
}
.trace-entry {
  display: flex; justify-content: space-between; align-items: baseline;
  gap: 0.5rem; padding: 0.18rem 0.8rem;
  border-bottom: 1px solid #333;
}
.trace-entry:nth-child(even) { background: rgba(0,0,0,0.15); }
.te-plain { color: var(--text); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; flex: 1; }
.te-arrow { color: var(--dim); flex-shrink: 0; font-size: 0.55rem; }
.te-code  { color: var(--accent); font-size: 0.72rem; letter-spacing: 0.04em; flex-shrink: 0; }
.te-type  { color: var(--dim); font-size: 0.55rem; margin-left: 0.2rem; }
.trace-empty { padding: 1rem; font-size: 0.68rem; color: var(--dim); text-align: center; }

/* ── Status msg (now just a floating strip) ── */
.status-strip {
  padding: 0.3rem 1rem; font-size: 0.66rem; min-height: 1.6rem;
  letter-spacing: 0.04em;
}
.status-strip.ok   { color: var(--accent); }
.status-strip.err  { color: var(--err); }
.status-strip.warn { color: var(--warn); }

/* ── Codebook panel ── */
details {
  border: 1px solid var(--border); background: var(--panel);
}
summary {
  padding: 0.55rem 1rem; font-size: 0.62rem; color: var(--muted);
  letter-spacing: 0.1em; text-transform: uppercase;
  cursor: pointer; user-select: none;
  display: flex; align-items: center; gap: 0.5rem;
  list-style: none;
}
summary::-webkit-details-marker { display: none; }
summary::before {
  content: '▶'; font-size: 0.48rem; color: var(--dim); transition: transform 0.18s;
}
details[open] summary::before { transform: rotate(90deg); }
.summary-actions { margin-left: auto; display: flex; gap: 0.5rem; }

.cb-controls {
  padding: 0.7rem 1rem; border-bottom: 1px solid var(--border);
  display: flex; gap: 0.6rem; align-items: center; flex-wrap: wrap;
  background: #333333;
}
.cb-filter {
  background: var(--bg); border: 1px solid var(--border);
  color: var(--text); font-family: var(--mono); font-size: 0.75rem;
  padding: 0.3rem 0.6rem; outline: none; width: 200px;
}

.dict-tabs { display: flex; border-bottom: 1px solid var(--border); }
.dict-tab {
  padding: 0.4rem 1rem; font-size: 0.62rem; letter-spacing: 0.08em;
  text-transform: uppercase; cursor: pointer; color: var(--muted);
  border-bottom: 2px solid transparent; margin-bottom: -1px;
  transition: color 0.14s;
}
.dict-tab.active { color: var(--accent); border-bottom-color: var(--accent); }
.dict-tab:hover:not(.active) { color: var(--text); }

.dict-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 0; max-height: 240px; overflow-y: auto;
  font-size: 0.67rem;
}
.dict-entry {
  display: flex; justify-content: space-between; gap: 0.5rem;
  padding: 0.18rem 0.8rem;
  border-bottom: 1px solid #333;
}
.dict-entry:nth-child(even) { background: rgba(0,0,0,0.15); }
.de-code { color: var(--accent2); font-weight: bold; letter-spacing: 0.04em; }
.de-word { color: var(--muted); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.de-type { color: var(--dim); font-size: 0.56rem; margin-left: 0.3rem; }

/* ── Import modal ── */
.modal-overlay {
  display: none; position: fixed; inset: 0;
  background: rgba(0,0,0,0.75); z-index: 1000;
  align-items: center; justify-content: center;
}
.modal-overlay.open { display: flex; }
.modal {
  background: var(--panel); border: 1px solid var(--border);
  width: min(600px, 92vw); max-height: 80vh;
  display: flex; flex-direction: column;
}
.modal-hdr {
  display: flex; align-items: center; padding: 0.8rem 1rem;
  border-bottom: 1px solid var(--border);
  font-size: 0.7rem; letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--accent);
}
.modal-close {
  margin-left: auto; background: none; border: none;
  color: var(--muted); font-size: 1rem; cursor: pointer; padding: 0 0.3rem;
}
.modal-close:hover { color: var(--err); }
.modal-body { padding: 1rem; flex: 1; overflow-y: auto; display: flex; flex-direction: column; gap: 0.8rem; }
.modal-footer { padding: 0.7rem 1rem; border-top: 1px solid var(--border); display: flex; gap: 0.6rem; justify-content: flex-end; }
textarea.import-area {
  height: 200px; background: var(--bg); border: 1px solid var(--border);
  color: var(--text); font-size: 0.75rem; padding: 0.6rem; resize: vertical;
  min-height: 80px;
}
.import-note { font-size: 0.65rem; color: var(--muted); line-height: 1.6; }

/* scrollbars */
::-webkit-scrollbar { width: 4px; height: 4px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--border); }
::-webkit-scrollbar-thumb:hover { background: var(--dim); }

/* ── Live encoding display (collapsible <details>) ── */
.live-encode {
  border: 1px solid var(--border); background: var(--panel);
  border-radius: 0;
}
/* Summary doubles as the header. cursor:pointer because clicking expands. */
.live-hdr {
  display: flex; align-items: center; gap: 0.8em;
  padding: 0.4em 0.8em;
  background: #333333;
  cursor: pointer;
  list-style: none; /* hide the default disclosure triangle */
}
.live-hdr::-webkit-details-marker { display: none; }
.live-hdr::before {
  content: '▸';
  color: var(--accent);
  font-size: 0.7em;
  transition: transform 0.1s;
  display: inline-block;
}
.live-encode[open] > .live-hdr::before { transform: rotate(90deg); }
.live-encode[open] > .live-hdr { border-bottom: 1px solid var(--border); }
.live-lbl {
  font-size: 0.62rem; color: var(--muted); letter-spacing: 0.1em;
  text-transform: uppercase;
}
.live-progress { flex: 1; font-size: 0.6rem; color: var(--dim); }
.live-skip { font-size: 0.58rem; padding: 0.2rem 0.6rem; }
.live-feed {
  max-height: 300px; overflow-y: auto; padding: 0.3em;
  font-family: var(--mono); font-size: 0.7rem;
}
.live-entry {
  display: flex; align-items: center; gap: 0.5em;
  padding: 0.15em 0.4em;
  animation: liveFadeIn 0.15s ease-out;
}
.live-entry:nth-child(even) { background: rgba(0,0,0,0.12); }
.live-badge {
  font-size: 0.55rem; font-weight: bold; letter-spacing: 0.05em;
  text-transform: uppercase; padding: 0.1em 0.4em;
  border-radius: 2px; min-width: 4.5em; text-align: center;
  flex-shrink: 0;
}
.live-phrases  .live-badge { background: #5F7F5F; color: var(--text); }
.live-words    .live-badge { background: #4F6F8F; color: var(--text); }
.live-trigrams .live-badge,
.live-digrams  .live-badge,
.live-letters  .live-badge { background: #4F4F4F; color: var(--muted); }
.live-special  .live-badge { background: #5F5F4F; color: var(--warn); }
.live-null     .live-badge { background: #6F5F4F; color: var(--warn); }
.live-plain { color: var(--text); }
.live-arrow { color: var(--dim); font-size: 0.55rem; }
.live-code  { color: var(--accent); letter-spacing: 0.04em; }
.live-done {
  padding: 0.4em 0.8em; font-size: 0.65rem; color: var(--muted);
  border-top: 1px solid var(--border); font-style: italic;
}
@keyframes liveFadeIn {
  from { opacity: 0; transform: translateX(-6px); }
  to   { opacity: 1; transform: translateX(0); }
}

/* ── Footer ── */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 1rem 2rem;
  font-size: 0.6rem;
  color: var(--dim);
  text-align: center;
  line-height: 1.7;
  letter-spacing: 0.03em;
}
.site-footer a { color: var(--muted); }
.site-footer a:hover { color: var(--accent); }

/* Cross-page navigation strip (added when codebook tools moved into codebooks/ dir) */
nav.section-nav {
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  padding: 0.5rem 2rem;
  font-family: var(--sans);
  font-size: 0.85rem;
  color: var(--muted);
  text-align: center;
  letter-spacing: 0.04em;
}
nav.section-nav a {
  color: var(--accent);
  text-decoration: none;
}
nav.section-nav a:hover {
  color: var(--warn);
  text-decoration: underline;
}
nav.section-nav strong {
  color: var(--warn);
  font-weight: 700;
}

/* ── Additive pad field (shown when Superencipherment = additive) ── */
.pad-field {
  flex-basis: 100%;
  border-top: 1px dashed var(--border);
  padding-top: 0.6rem;
  margin-top: 0.2rem;
}
.pad-field > label { color: var(--warn); }
.pad-area {
  width: 100%;
  min-height: 3.5em;
  max-height: 8em;
  background: var(--bg);
  color: var(--accent);
  border: 1px solid var(--border);
  padding: 0.4rem 0.5rem;
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.05em;
  word-break: break-all;
  resize: vertical;
}
.pad-area::placeholder { color: var(--dim); font-style: italic; }
.pad-controls {
  display: flex;
  gap: 0.4rem;
  align-items: center;
  margin-top: 0.3rem;
}
.pad-controls button.ghost {
  font-size: 0.7rem;
  padding: 0.25rem 0.7rem;
}
.pad-count {
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--muted);
  margin-left: auto;
}
.pad-field .field-hint {
  max-width: none;
  color: var(--warn);
  font-style: normal;
}
.pad-field .field-hint strong { color: var(--err); }

/* ── Encoding Map panel (bidirectional click-to-highlight) ───────────────── */
.encode-map {
  background: var(--panel);
  border: 1px solid var(--border);
  padding: 0.8rem 1rem;
  margin-top: 0.5rem;
}
.map-hdr {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  margin-bottom: 0.6rem;
  flex-wrap: wrap;
}
.map-title {
  font-size: 0.85rem;
  font-weight: 800;
  color: var(--accent);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-family: var(--sans);
}
.map-hint {
  font-size: 0.7rem;
  color: var(--dim);
  font-style: italic;
  flex: 1;
  text-align: right;
}
.map-section {
  margin-bottom: 0.6rem;
}
.map-label {
  font-size: 0.65rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.07em;
  margin-bottom: 0.3rem;
}
.map-area {
  background: var(--bg);
  border: 1px solid var(--border);
  padding: 0.5rem;
  min-height: 2.5em;
  max-height: 12em;
  overflow-y: auto;
  font-family: var(--mono);
  font-size: 0.85rem;
  line-height: 2.0;
  word-break: break-word;
}
.map-empty {
  color: var(--dim);
  font-style: italic;
}
.map-token, .map-group {
  display: inline-block;
  padding: 0.05em 0.35em;
  margin: 0 1px;
  border-radius: 3px;
  cursor: pointer;
  transition: outline 0.08s, background 0.08s;
  border: 1px solid transparent;
}
.map-token:hover, .map-group:hover {
  outline: 1px solid var(--accent);
}
/* Type-specific tints (background slightly tinted, text color from token theme) */
.mt-phrases  { background: rgba(140,208,211,0.16); color: #BFE0E2; }
.mt-words    { background: rgba(143,178,143,0.20); color: #C0E0C0; }
.mt-trigrams { background: rgba(220,180,130,0.20); color: #E6C898; }
.mt-digrams  { background: rgba(220,220,130,0.16); color: #E6E098; }
.mt-letters  { background: rgba(220,160,160,0.14); color: #E0BEBE; }
.mt-special  { background: rgba(180,140,220,0.20); color: #D0B8E8; font-style: italic; }
.mt-null     { background: rgba(120,120,120,0.20); color: #888; font-style: italic; }
.map-token.map-highlight, .map-group.map-highlight {
  outline: 2px solid var(--warn) !important;
  background: var(--warn) !important;
  color: var(--bg) !important;
  font-weight: bold;
}
.map-legend {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
  margin-top: 0.4rem;
  font-size: 0.7rem;
}
.map-legend .map-token {
  cursor: default;
  padding: 0.1em 0.5em;
}
.map-legend .map-token:hover {
  outline: none;
}
.map-cipher-note {
  margin-top: 0.5rem;
  font-size: 0.7rem;
  color: var(--warn);
  font-style: italic;
}
.map-cipher-note:empty {
  display: none;
}