:root {
  --bg: #0d1117;
  --bg2: #131a24;
  --bg3: #18202c;
  --line: #243040;
  --fg: #d5dde8;
  --fg-dim: #8a97a8;
  --accent: #4aa3ff;
  --accent2: #7ee787;
  --warn: #f2cc60;
  --err: #ff6b6b;
  --mono: "Cascadia Mono", "JetBrains Mono", Consolas, "Courier New", monospace;

  --c-magic: #b083f0;
  --c-header: #4aa3ff;
  --c-flags: #45c6d6;
  --c-size: #f2cc60;
  --c-checksum: #ff9e64;
  --c-huffman: #7ee787;
  --c-literal: #64b5a0;
  --c-match: #e06c9f;
  --c-payload: #5c7080;
  --c-block: #3d6a99;
  --c-trailer: #c792ea;
  --c-pad: #4a5568;
  --c-error: #ff6b6b;
  --c-unknown: #37414f;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  background: var(--bg);
  color: var(--fg);
  font: 13px/1.45 "Segoe UI", system-ui, sans-serif;
}

body { display: flex; flex-direction: column; }

/* ------------------------------------------------------------- top bar */

.topbar {
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem; padding: .55rem .9rem;
  background: linear-gradient(180deg, #16202e, #101823);
  border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: center; gap: .7rem; }
.logo { font-size: 1.6rem; color: var(--accent); line-height: 1; }
.topbar h1 { margin: 0; font-size: 1.02rem; letter-spacing: .04em; font-weight: 600; }
.topbar p { margin: 0; font-size: .72rem; color: var(--fg-dim); }
.topactions { display: flex; align-items: center; gap: .5rem; }

.fmtgroup {
  display: flex; align-items: center; gap: .5rem;
  padding: .2rem .5rem .2rem .55rem; margin-right: .35rem;
  border: 1px solid var(--line); border-radius: 6px; background: #0e161f;
}
.fmtlabel {
  font-size: .62rem; letter-spacing: .12em; text-transform: uppercase;
  color: var(--fg-dim); white-space: nowrap;
}
.fmtbtns { display: flex; gap: .2rem; flex-wrap: wrap; }
.fmtbtn {
  padding: .22rem .55rem; font-size: .73rem; letter-spacing: .03em;
  background: transparent; border: 1px solid transparent; color: var(--fg-dim);
}
.fmtbtn:hover { background: #1d2836; color: var(--fg); border-color: #2c3b4e; }
.fmtbtn.active {
  background: #1d4e7d; border-color: #3b83c9; color: #eaf3ff; font-weight: 600;
}

button, select, input[type=text], input[type=number], textarea {
  background: var(--bg3); color: var(--fg); border: 1px solid var(--line);
  border-radius: 4px; padding: .3rem .5rem; font: inherit;
}
textarea { font-family: var(--mono); font-size: 11.5px; width: 100%; resize: vertical; }
button { cursor: pointer; transition: background .12s, border-color .12s; }
button:hover { background: #22303f; border-color: #35465c; }
button.primary { background: #1d4e7d; border-color: #2a6ba8; color: #eaf3ff; }
button.primary:hover { background: #24619a; }
button.ghost { background: transparent; color: var(--fg-dim); }
select[multiple] { height: auto; }

.fileload span {
  display: inline-block; padding: .3rem .6rem; border: 1px solid var(--line);
  border-radius: 4px; background: var(--bg3); cursor: pointer; font-size: .8rem;
}
.fileload span:hover { background: #22303f; }
.fileload.block span { display: block; text-align: center; }

/* --------------------------------------------------------------- layout */

main { flex: 1; display: grid; grid-template-columns: 335px 1fr; min-height: 0; }

.side { overflow-y: auto; border-right: 1px solid var(--line); background: var(--bg2); }
.panel { border-bottom: 1px solid var(--line); }
.panel > h2 {
  margin: 0; padding: .5rem .75rem; font-size: .76rem; letter-spacing: .09em;
  text-transform: uppercase; color: var(--fg-dim); cursor: pointer; user-select: none;
  background: #111924;
}
.panel > h2::before { content: "\25B8 "; color: var(--accent); }
.panel[data-open] > h2::before { content: "\25BE "; }
.panel > .body { display: none; padding: .6rem .75rem .8rem; }
.panel[data-open] > .body { display: block; }
.panel h3 { margin: .9rem 0 .4rem; font-size: .72rem; text-transform: uppercase; letter-spacing: .08em; color: var(--fg-dim); }

.row { display: flex; align-items: center; gap: .5rem; margin-bottom: .4rem; }
.row > label { flex: 0 0 8.4rem; font-size: .76rem; color: var(--fg-dim); }
.row > select, .row > input[type=text], .row > input[type=number] { flex: 1; min-width: 0; }
.row.buttons { gap: .4rem; margin-top: .6rem; }
.row.buttons button { flex: 1; }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: .35rem; }
.grid2 button { font-size: .76rem; }
.fgrid { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: .3rem; margin-bottom: .4rem; }
.fgrid input { min-width: 0; }
.hint { margin: .25rem 0 .5rem; font-size: .72rem; color: var(--fg-dim); }
.hint code { background: #0c1219; padding: 0 .25rem; border-radius: 3px; }

.faultgroup { margin-bottom: .5rem; }
.faultgroup > b { display: block; font-size: .7rem; color: var(--accent); letter-spacing: .05em; margin: .45rem 0 .2rem; }
.faultgroup label {
  display: block; font-size: .75rem; padding: .12rem 0 .12rem .1rem;
  color: var(--fg); cursor: pointer;
}
.faultgroup label:hover { color: #fff; }
.faultgroup label input { margin-right: .35rem; }
.faultgroup label em { color: var(--fg-dim); font-style: normal; font-size: .68rem; display: block; margin-left: 1.25rem; }

.faultlist { list-style: none; margin: .3rem 0 0; padding: 0; font-family: var(--mono); font-size: 11px; }
.faultlist li { display: flex; align-items: center; gap: .4rem; padding: .15rem .3rem; border: 1px solid var(--line); border-radius: 3px; margin-bottom: .2rem; background: #101822; }
.faultlist li span { flex: 1; }
.faultlist li button { padding: 0 .35rem; font-size: 11px; background: transparent; border: none; color: var(--err); }

/* ------------------------------------------------------------ work area */

.work { display: flex; flex-direction: column; min-width: 0; min-height: 0; }
.tabs { display: flex; gap: .15rem; padding: .35rem .6rem 0; background: var(--bg2); border-bottom: 1px solid var(--line); }
.tabs button {
  border: 1px solid transparent; border-bottom: none; border-radius: 5px 5px 0 0;
  background: transparent; color: var(--fg-dim); padding: .35rem .8rem; font-size: .78rem;
}
.tabs button.active { background: var(--bg); color: var(--fg); border-color: var(--line); }
.pane { display: none; flex: 1; min-height: 0; overflow: hidden; }
.pane.active { display: flex; flex-direction: column; }

.split { display: grid; grid-template-columns: 1fr 340px; min-height: 0; flex: 1; }
.treewrap { overflow: auto; padding: .5rem .6rem; font-family: var(--mono); font-size: 11.6px; }
.detail { overflow: auto; border-left: 1px solid var(--line); padding: .7rem .75rem; background: var(--bg2); }

.tnode { white-space: nowrap; }
.trow { display: flex; align-items: baseline; gap: .4rem; padding: .5px .3rem; border-radius: 3px; cursor: pointer; }
.trow:hover { background: #18222f; }
.trow.sel { background: #1d3a57; }
.twist { width: .8rem; color: var(--fg-dim); flex: 0 0 auto; }
.tname { flex: 0 0 auto; }
.tval { color: var(--fg-dim); flex: 1; overflow: hidden; text-overflow: ellipsis; }
.toff { color: #5b6b7d; font-size: 10.5px; flex: 0 0 auto; }
.tkids { margin-left: .85rem; border-left: 1px dotted #263140; padding-left: .3rem; }
.badge { font-size: 9.5px; padding: 0 .3rem; border-radius: 8px; margin-left: .3rem; }
.badge.error { background: #4a1d1d; color: var(--err); }
.badge.warn { background: #4a3c17; color: var(--warn); }
.badge.info { background: #1d3448; color: var(--accent); }

.detail h3 { margin: 0 0 .4rem; font-size: .85rem; color: var(--fg); }
.detail dl { display: grid; grid-template-columns: 7.2rem 1fr; gap: .2rem .5rem; margin: 0 0 .7rem; font-size: .76rem; }
.detail dt { color: var(--fg-dim); }
.detail dd { margin: 0; font-family: var(--mono); font-size: 11px; word-break: break-word; }
.detail table { width: 100%; border-collapse: collapse; font-size: 11px; font-family: var(--mono); margin-bottom: .7rem; }
.detail th, .detail td { text-align: left; padding: .15rem .3rem; border-bottom: 1px solid var(--line); }
.detail th { color: var(--fg-dim); font-weight: 500; }
.issue { padding: .35rem .5rem; border-radius: 4px; margin-bottom: .35rem; font-size: .75rem; }
.issue.error { background: #33161a; border-left: 3px solid var(--err); }
.issue.warn { background: #322a12; border-left: 3px solid var(--warn); }
.issue.info { background: #16283a; border-left: 3px solid var(--accent); }

/* ------------------------------------------------------------- hex view */

.hexbar {
  display: flex; align-items: center; gap: .45rem; padding: .4rem .6rem;
  border-bottom: 1px solid var(--line); background: var(--bg2); font-size: .76rem; flex-wrap: wrap;
}
.hexbar label { color: var(--fg-dim); display: flex; align-items: center; gap: .3rem; }
.hexbar input[type=number] { width: 6rem; }
.hexbar input[type=text] { width: 3rem; font-family: var(--mono); text-transform: uppercase; }
.hexbar button { padding: .2rem .5rem; }
.spacer { flex: 1; }

.legend { display: flex; flex-wrap: wrap; gap: .45rem; padding: .35rem .6rem; border-bottom: 1px solid var(--line); font-size: .68rem; color: var(--fg-dim); }
.legend i { display: inline-block; width: .6rem; height: .6rem; border-radius: 2px; margin-right: .25rem; vertical-align: -1px; }

.hexview { flex: 1; overflow: auto; padding: .5rem .6rem; font-family: var(--mono); font-size: 12px; line-height: 1.5; }
.hexrow { white-space: pre; }
.hexoff { color: #55647a; }
.hb { padding: 0 1px; border-radius: 2px; cursor: pointer; }
.hb:hover { outline: 1px solid var(--accent); }
.hb.sel { background: var(--accent) !important; color: #06121e !important; }
.hb.hl { box-shadow: inset 0 -2px 0 var(--accent2); }
.hasc { color: #6d7d90; }
.hasc.sel { background: var(--accent); color: #06121e; }

.c-magic { color: var(--c-magic); }
.c-header { color: var(--c-header); }
.c-flags { color: var(--c-flags); }
.c-size { color: var(--c-size); }
.c-checksum { color: var(--c-checksum); }
.c-huffman { color: var(--c-huffman); }
.c-literal { color: var(--c-literal); }
.c-match { color: var(--c-match); }
.c-payload { color: var(--c-payload); }
.c-block { color: var(--c-block); }
.c-trailer { color: var(--c-trailer); }
.c-pad { color: var(--c-pad); }
.c-error { color: #fff; background: #5c1f1f; }
.c-unknown { color: var(--c-unknown); }

/* --------------------------------------------------------------- tables */

.tablewrap { flex: 1; overflow: auto; padding: .5rem .6rem; }
table.grid { width: 100%; border-collapse: collapse; font-family: var(--mono); font-size: 11.5px; }
table.grid th {
  position: sticky; top: 0; background: var(--bg2); text-align: left; color: var(--fg-dim);
  font-weight: 500; padding: .3rem .4rem; border-bottom: 1px solid var(--line); z-index: 1;
}
table.grid td { padding: .15rem .4rem; border-bottom: 1px solid #1a222d; }
table.grid tr:hover td { background: #18222f; }
table.grid td.num { text-align: right; }
.tag { padding: 0 .3rem; border-radius: 3px; font-size: 10px; }
.tag.lit { background: #1d3b33; color: var(--c-literal); }
.tag.match { background: #3b1d2c; color: var(--c-match); }
.tag.eob { background: #2a2a3b; color: #9aa4d6; }
.tag.raw { background: #2a3340; color: #9db4cc; }

.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); gap: .5rem; margin-bottom: .8rem; }
.card { background: var(--bg2); border: 1px solid var(--line); border-radius: 6px; padding: .55rem .7rem; }
.card h4 { margin: 0 0 .25rem; font-size: .68rem; text-transform: uppercase; letter-spacing: .07em; color: var(--fg-dim); font-weight: 500; }
.card .big { font-size: 1.15rem; font-family: var(--mono); }
.card .sub { font-size: .7rem; color: var(--fg-dim); }
.ok { color: var(--accent2); }
.bad { color: var(--err); }
.mid { color: var(--warn); }

.batchcfg { padding: .8rem 1rem; overflow: auto; max-width: 720px; }
.batchcfg h3 { margin-top: 0; }

.helpdoc { padding: 1rem 1.2rem; overflow: auto; max-width: 900px; font-size: .82rem; }
.helpdoc h3 { color: var(--accent); margin-top: 1.3rem; }
.helpdoc table { width: 100%; border-collapse: collapse; font-size: .76rem; margin: .5rem 0; }
.helpdoc th, .helpdoc td { border: 1px solid var(--line); padding: .25rem .45rem; text-align: left; vertical-align: top; }
.helpdoc th { background: var(--bg2); color: var(--fg-dim); font-weight: 500; }
.helpdoc code { font-family: var(--mono); background: #0c1219; padding: 0 .25rem; border-radius: 3px; }

/* ------------------------------------------------------------ statusbar */

.statusbar {
  display: flex; align-items: center; gap: .6rem; padding: .3rem .8rem;
  border-top: 1px solid var(--line); background: var(--bg2); font-size: .72rem; color: var(--fg-dim);
}
.statusbar .err { color: var(--err); }
.statusbar .ok { color: var(--accent2); }