/* ═══════════════════════════════════════════════════════════════
   GridSolver — enterprise dark workspace
   Palette: slate-charcoal grounds, HV amber accent, drawing blue
   Type: Saira Semi Condensed (display) · IBM Plex Sans (UI) · IBM Plex Mono (data)
   ═══════════════════════════════════════════════════════════════ */
:root {
  --g0: #1E2A3A;         /* chrome: title & status bars (deep blue-grey) */
  --g1: #F2F4F7;         /* app ground */
  --g2: #FFFFFF;         /* panel */
  --g3: #EDF1F6;         /* raised / hover */
  --g4: #DFE6EE;         /* active */
  --line: #D3DAE3;
  --line-soft: #E5EAF0;
  --ink: #1A222C;
  --ink-2: #465362;
  --ink-3: #768392;
  --accent: #2266AA;     /* professional blue */
  --accent-dim: #6FA0CC;
  --accent-ink: #FFFFFF;
  --blue: #2B6CB0;       /* citation / drawing blue */
  --good: #2F8F54;
  --warn: #A8731A;
  --bad: #C24E38;
  --violet: #6D4FBF;
  --red-mark: #D9432E;   /* markup red */
  --chrome-ink: #E7EDF4; /* text on dark chrome */
  --chrome-ink-2: #9FB0C3;
  --sans: "IBM Plex Sans", "Segoe UI", sans-serif;
  --disp: "Saira Semi Condensed", "Arial Narrow", sans-serif;
  --mono: "IBM Plex Mono", Consolas, monospace;
  --hand: "Caveat", cursive;
  --rad: 6px;
}
* { box-sizing: border-box; margin: 0; }
html, body { height: 100%; }
body {
  background: var(--g1);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 13.5px;
  line-height: 1.5;
  overflow: hidden;
}
#app { display: flex; flex-direction: column; height: 100vh; }
button { font-family: inherit; cursor: pointer; }
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-thumb { background: #C4CDD8; border-radius: 5px; border: 2px solid var(--g1); }
::-webkit-scrollbar-track { background: transparent; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }

/* ══════════ TITLE / MENU BAR ══════════ */
.titlebar {
  display: flex; align-items: stretch; gap: 18px;
  background: var(--g0); border-bottom: 1px solid #16202D;
  padding: 0 14px 0 12px; height: 44px; flex: none;
}
.brand { display: flex; align-items: center; gap: 9px; padding-right: 8px; }
.brand-mark { width: 24px; height: 24px; border-radius: 5px; }
.brand-name { font-family: var(--disp); font-weight: 700; font-size: 17px; letter-spacing: 0.02em; color: var(--chrome-ink); }
.brand-tier { font-family: var(--mono); font-size: 8.5px; letter-spacing: 0.18em; color: var(--chrome-ink-2); margin-top: 3px; }
.menubar { display: flex; align-items: stretch; }
.menu { position: relative; display: flex; }
.menu > button {
  background: none; border: none; color: var(--chrome-ink-2);
  font-family: var(--sans); font-size: 13px; padding: 0 11px;
}
.menu > button:hover, .menu.open > button { background: rgba(255,255,255,0.10); color: var(--chrome-ink); }
.menu-drop {
  display: none; position: absolute; top: 100%; left: 0; z-index: 300;
  min-width: 235px; background: var(--g2); border: 1px solid var(--line);
  border-radius: 0 0 var(--rad) var(--rad); padding: 5px;
  box-shadow: 0 14px 34px rgba(24,36,50,0.18);
}
.menu.open .menu-drop { display: block; }
.menu-item {
  display: flex; align-items: center; gap: 10px; width: 100%;
  background: none; border: none; color: var(--ink);
  font-size: 13px; padding: 6px 10px; border-radius: 4px; text-align: left;
}
.menu-item:hover { background: var(--g4); }
.menu-item .mi-kbd { margin-left: auto; font-family: var(--mono); font-size: 10.5px; color: var(--ink-3); }
.menu-sep { height: 1px; background: var(--line-soft); margin: 5px 4px; }
.titlebar-right { margin-left: auto; display: flex; align-items: center; gap: 12px; }
.env-chip {
  font-family: var(--mono); font-size: 9.5px; letter-spacing: 0.14em;
  color: #8FBCE8; border: 1px solid #4A6E94;
  padding: 3px 8px; border-radius: 3px;
}
.user-chip { display: flex; align-items: center; gap: 7px; font-size: 12.5px; color: var(--chrome-ink-2); }
.user-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--good); }

/* ══════════ PROJECT BAR ══════════ */
.projectbar {
  display: flex; align-items: center; gap: 20px; flex: none;
  background: var(--g2); border-bottom: 1px solid var(--line);
  padding: 8px 18px;
}
.proj-id { display: flex; align-items: baseline; gap: 12px; min-width: 0; flex-wrap: wrap; }
.proj-code {
  font-family: var(--mono); font-size: 12px; color: var(--accent-ink);
  background: var(--accent); border-radius: 3px; padding: 1px 7px; font-weight: 500;
}
.proj-name { font-family: var(--disp); font-weight: 600; font-size: 15.5px; }
.proj-client { font-size: 12px; color: var(--ink-3); }
.proj-meta { margin-left: auto; display: flex; gap: 22px; flex: none; }
.proj-meta-item { display: flex; flex-direction: column; line-height: 1.25; }
.proj-meta-item .k { font-size: 9.5px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink-3); }
.proj-meta-item .v { font-size: 12px; color: var(--ink-2); }

/* ══════════ WORKSPACE ══════════ */
.workspace { display: flex; flex: 1; min-height: 0; }

/* rail */
.rail {
  width: 232px; flex: none; background: var(--g2);
  border-right: 1px solid var(--line); padding: 12px 10px;
  display: flex; flex-direction: column; gap: 3px; overflow-y: auto;
}
.rail-caption {
  font-family: var(--mono); font-size: 9.5px; letter-spacing: 0.16em;
  color: var(--ink-3); padding: 4px 8px 7px;
}
.rail-step {
  display: flex; align-items: center; gap: 11px; width: 100%;
  background: none; border: none; border-left: 3px solid transparent;
  color: var(--ink-2); padding: 9px 9px; border-radius: 5px; text-align: left;
}
.rail-step:hover { background: var(--g3); color: var(--ink); }
.rail-step.active { background: var(--g3); color: var(--ink); border-left-color: var(--accent); }
.rail-num {
  font-family: var(--mono); font-size: 11px; width: 24px; height: 24px; flex: none;
  display: grid; place-items: center; border-radius: 5px;
  background: var(--g4); color: var(--ink-2);
}
.rail-step.active .rail-num { background: var(--accent); color: var(--accent-ink); font-weight: 500; }
.rail-step.done .rail-num { background: transparent; border: 1px solid var(--good); color: var(--good); }
.rail-label { display: flex; flex-direction: column; line-height: 1.25; min-width: 0; }
.rail-label b { font-family: var(--disp); font-weight: 600; font-size: 13.5px; letter-spacing: 0.01em; }
.rail-label span { font-size: 10.5px; color: var(--ink-3); }
.rail-foot { margin-top: auto; padding: 10px 8px 4px; border-top: 1px solid var(--line-soft); }
.rail-foot .gauge-row { display: flex; justify-content: space-between; font-size: 10.5px; color: var(--ink-3); margin-bottom: 5px; }
.gauge { height: 4px; background: var(--g4); border-radius: 2px; overflow: hidden; }
.gauge > i { display: block; height: 100%; background: var(--accent); border-radius: 2px; }

/* main */
.main { flex: 1; min-width: 0; overflow-y: auto; padding: 22px 26px 40px; }
.view-head { display: flex; align-items: flex-end; gap: 16px; margin-bottom: 18px; flex-wrap: wrap; }
.view-eyebrow { font-family: var(--mono); font-size: 10px; letter-spacing: 0.16em; color: var(--accent); display: block; margin-bottom: 3px; }
.view-title { font-family: var(--disp); font-weight: 600; font-size: 24px; line-height: 1.1; }
.view-sub { color: var(--ink-3); font-size: 12.5px; max-width: 60ch; }
.view-actions { margin-left: auto; display: flex; gap: 9px; align-items: center; }

/* buttons */
.btn {
  display: inline-flex; align-items: center; gap: 7px;
  background: var(--g3); color: var(--ink); border: 1px solid var(--line);
  font-size: 12.5px; font-weight: 500; padding: 7px 14px; border-radius: var(--rad);
}
.btn:hover { background: var(--g4); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.btn.primary:hover { filter: brightness(1.08); }
.btn.ghost { background: transparent; }
.btn.sm { padding: 4px 10px; font-size: 11.5px; }
.btn:disabled { opacity: 0.45; cursor: default; }

/* panels & cards */
.panel { background: var(--g2); border: 1px solid var(--line); border-radius: 8px; }
.panel-head {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 14px; border-bottom: 1px solid var(--line-soft);
}
.panel-title { font-family: var(--disp); font-weight: 600; font-size: 14.5px; }
.panel-head .spacer { margin-left: auto; }
.panel-body { padding: 14px; }
.grid { display: grid; gap: 14px; }

/* stat tiles */
.stat {
  background: var(--g2); border: 1px solid var(--line); border-radius: 8px;
  padding: 12px 14px; display: flex; flex-direction: column; gap: 2px;
}
.stat .s-label { font-size: 10px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink-3); }
.stat .s-value { font-family: var(--disp); font-weight: 600; font-size: 23px; font-variant-numeric: tabular-nums; }
.stat .s-value small { font-size: 13px; color: var(--ink-2); font-weight: 500; }
.stat .s-note { font-size: 11px; color: var(--ink-3); }
.stat.accent .s-value { color: var(--accent); }

/* chips / status pills */
.pill {
  display: inline-flex; align-items: center; gap: 5px;
  font-family: var(--mono); font-size: 10px; letter-spacing: 0.05em;
  padding: 2px 8px; border-radius: 999px; border: 1px solid transparent;
  white-space: nowrap;
}
.pill::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: currentColor; }
.pill.extracted { color: var(--good); border-color: color-mix(in srgb, var(--good) 40%, transparent); background: color-mix(in srgb, var(--good) 10%, transparent); }
.pill.ambiguous { color: var(--warn); border-color: color-mix(in srgb, var(--warn) 40%, transparent); background: color-mix(in srgb, var(--warn) 10%, transparent); }
.pill.missing { color: var(--bad); border-color: color-mix(in srgb, var(--bad) 40%, transparent); background: color-mix(in srgb, var(--bad) 10%, transparent); }
.pill.assumed { color: var(--blue); border-color: color-mix(in srgb, var(--blue) 40%, transparent); background: color-mix(in srgb, var(--blue) 10%, transparent); }
.pill.contradictory { color: var(--violet); border-color: color-mix(in srgb, var(--violet) 40%, transparent); background: color-mix(in srgb, var(--violet) 10%, transparent); }
.pill.auto { color: var(--good); border-color: color-mix(in srgb, var(--good) 40%, transparent); background: color-mix(in srgb, var(--good) 10%, transparent); }
.pill.review { color: var(--warn); border-color: color-mix(in srgb, var(--warn) 40%, transparent); background: color-mix(in srgb, var(--warn) 10%, transparent); }
.pill.redesign { color: var(--violet); border-color: color-mix(in srgb, var(--violet) 40%, transparent); background: color-mix(in srgb, var(--violet) 10%, transparent); }
.pill.rfi { color: var(--blue); border-color: color-mix(in srgb, var(--blue) 40%, transparent); background: color-mix(in srgb, var(--blue) 10%, transparent); }
.pill.applied { color: var(--good); }

/* tables */
.tbl { width: 100%; border-collapse: collapse; font-size: 12.5px; }
.tbl th {
  text-align: left; font-family: var(--mono); font-size: 10px; letter-spacing: 0.1em;
  text-transform: uppercase; color: var(--ink-3); font-weight: 400;
  padding: 8px 12px; border-bottom: 1px solid var(--line); white-space: nowrap;
}
.tbl td { padding: 9px 12px; border-bottom: 1px solid var(--line-soft); vertical-align: top; }
.tbl tr:hover td { background: color-mix(in srgb, var(--g3) 55%, transparent); }
.tbl .num { text-align: right; font-family: var(--mono); font-variant-numeric: tabular-nums; white-space: nowrap; }
.mono { font-family: var(--mono); }
.dim { color: var(--ink-3); }
.small { font-size: 11.5px; }

/* citations */
.cite {
  display: inline-flex; align-items: center; gap: 5px;
  font-family: var(--mono); font-size: 10.5px; color: var(--blue);
  background: color-mix(in srgb, var(--blue) 9%, transparent);
  border: 1px solid color-mix(in srgb, var(--blue) 25%, transparent);
  padding: 1px 7px; border-radius: 3px; cursor: pointer; white-space: nowrap;
}
.cite:hover { background: color-mix(in srgb, var(--blue) 18%, transparent); }

/* progress / extraction */
.progress-line { height: 5px; background: var(--g4); border-radius: 3px; overflow: hidden; }
.progress-line > i { display: block; height: 100%; width: 0; background: var(--accent); transition: width 0.35s ease; }
.log {
  font-family: var(--mono); font-size: 11.5px; color: #B9C6D4;
  background: var(--g0); border: 1px solid var(--g0); border-radius: 6px;
  padding: 12px 14px; height: 190px; overflow-y: auto; line-height: 1.75;
}
.log .lt { color: #64758A; margin-right: 8px; }
.log .ok { color: #6FCE8F; }
.log .hl { color: #F0B25A; }

/* doc tree */
.doc-row { display: flex; align-items: center; gap: 12px; padding: 9px 12px; border-bottom: 1px solid var(--line-soft); }
.doc-row:last-child { border-bottom: none; }
.doc-icon { width: 30px; height: 36px; flex: none; border-radius: 3px; background: var(--g4); position: relative; display:grid; place-items:center; font-family: var(--mono); font-size: 8px; color: var(--ink-2); letter-spacing: 0.04em; }
.doc-icon::after { content: ""; position: absolute; top: 0; right: 0; border-style: solid; border-width: 0 8px 8px 0; border-color: transparent var(--g2) transparent transparent; }
.doc-name { font-weight: 500; font-size: 12.5px; }
.doc-sub { font-size: 10.5px; color: var(--ink-3); font-family: var(--mono); }
.doc-right { margin-left: auto; }
.dropzone {
  border: 1.5px dashed var(--line); border-radius: 8px; padding: 26px 18px;
  text-align: center; color: var(--ink-3); font-size: 12.5px; cursor: pointer;
  transition: border-color .15s, background .15s;
}
.dropzone:hover { border-color: var(--accent-dim); background: color-mix(in srgb, var(--accent) 4%, transparent); color: var(--ink-2); }
.dropzone b { color: var(--ink-2); }

/* option tabs */
.opt-tabs { display: flex; gap: 8px; flex-wrap: wrap; }
.opt-tab {
  display: flex; flex-direction: column; align-items: flex-start; gap: 1px;
  background: var(--g2); border: 1px solid var(--line); border-radius: 7px;
  padding: 9px 16px; color: var(--ink-2); min-width: 168px; text-align: left;
}
.opt-tab:hover { background: var(--g3); }
.opt-tab.active { border-color: var(--accent); background: color-mix(in srgb, var(--accent) 7%, var(--g2)); color: var(--ink); }
.opt-tab .ot-k { font-family: var(--mono); font-size: 9.5px; letter-spacing: 0.12em; color: var(--ink-3); }
.opt-tab.active .ot-k { color: var(--accent); }
.opt-tab .ot-t { font-family: var(--disp); font-weight: 600; font-size: 14.5px; }
.opt-tab .ot-s { font-size: 10.5px; color: var(--ink-3); }

/* layout canvas */
.canvas-wrap { position: relative; background: var(--g0); border: 1px solid var(--line); border-radius: 8px; overflow: hidden; }
.canvas-toolbar {
  position: absolute; top: 10px; left: 10px; z-index: 5;
  display: flex; gap: 6px; background: color-mix(in srgb, var(--g2) 88%, transparent);
  border: 1px solid var(--line); border-radius: 6px; padding: 4px;
  backdrop-filter: blur(4px);
}
.tool-btn { background: none; border: none; color: var(--ink-2); font-size: 11.5px; font-family: var(--mono); padding: 4px 9px; border-radius: 4px; }
.tool-btn:hover { background: var(--g4); color: var(--ink); }
.tool-btn.on { background: var(--g4); color: var(--accent); }
.canvas-badge {
  position: absolute; top: 10px; right: 10px; z-index: 5;
  font-family: var(--mono); font-size: 10px; color: var(--ink-3);
  background: color-mix(in srgb, var(--g2) 88%, transparent); border: 1px solid var(--line);
  padding: 4px 9px; border-radius: 5px;
}
svg.plan text { user-select: none; }

/* kpi compare */
.kpi-best { color: var(--good); font-weight: 600; }
.delta-up { color: var(--bad); } .delta-dn { color: var(--good); }

/* markup module */
.markup-grid { display: grid; grid-template-columns: minmax(380px, 7fr) minmax(330px, 5fr); gap: 14px; align-items: start; }
@media (max-width: 1100px) { .markup-grid { grid-template-columns: 1fr; } }
.mk-row { padding: 11px 13px; border-bottom: 1px solid var(--line-soft); cursor: pointer; border-left: 3px solid transparent; }
.mk-row:hover { background: var(--g3); }
.mk-row.sel { background: var(--g3); border-left-color: var(--accent); }
.mk-row-top { display: flex; align-items: center; gap: 8px; margin-bottom: 4px; }
.mk-id { font-family: var(--mono); font-size: 10.5px; color: var(--ink-3); }
.mk-comment { font-family: var(--hand); font-size: 17px; color: var(--red-mark); line-height: 1.2; }
.mk-interp { font-size: 12px; color: var(--ink-2); margin-top: 3px; }
.mk-actions { display: flex; gap: 6px; margin-top: 8px; }
.conf-meter { display: inline-flex; align-items: center; gap: 5px; font-family: var(--mono); font-size: 10px; color: var(--ink-3); }
.conf-meter i { width: 34px; height: 4px; background: var(--g4); border-radius: 2px; overflow: hidden; display: inline-block; }
.conf-meter i b { display: block; height: 100%; background: var(--good); }
.seg { display: inline-flex; border: 1px solid var(--line); border-radius: 6px; overflow: hidden; }
.seg button { background: var(--g2); color: var(--ink-2); border: none; font-size: 11.5px; font-family: var(--mono); padding: 5px 12px; }
.seg button.on { background: var(--g4); color: var(--accent); }
.seg button + button { border-left: 1px solid var(--line); }

/* toasts */
#toasts { position: fixed; bottom: 44px; right: 18px; display: flex; flex-direction: column; gap: 8px; z-index: 500; }
.toast {
  background: var(--g2); border: 1px solid var(--line); border-left: 3px solid var(--accent);
  color: var(--ink); font-size: 12.5px; padding: 10px 14px; border-radius: 6px;
  box-shadow: 0 10px 28px rgba(24,36,50,0.22); max-width: 340px;
  animation: toast-in 0.22s ease;
}
.toast.good { border-left-color: var(--good); }
@keyframes toast-in { from { transform: translateY(8px); opacity: 0; } to { transform: none; opacity: 1; } }

/* modal */
.modal-veil {
  position: fixed; inset: 0; background: rgba(8, 11, 15, 0.62); z-index: 400;
  display: grid; place-items: center; backdrop-filter: blur(2px);
}
.modal {
  width: min(620px, 92vw); max-height: 82vh; overflow-y: auto;
  background: var(--g2); border: 1px solid var(--line); border-radius: 10px;
  box-shadow: 0 30px 70px rgba(24,36,50,0.28);
}
.modal .panel-body { padding: 16px 18px; }
.quote {
  font-size: 13px; color: var(--ink-2); border-left: 3px solid var(--blue);
  background: color-mix(in srgb, var(--blue) 6%, transparent);
  padding: 10px 14px; border-radius: 0 5px 5px 0; margin: 10px 0; font-style: italic;
}
.kv { display: grid; grid-template-columns: 130px 1fr; gap: 4px 14px; font-size: 12.5px; }
.kv .k { color: var(--ink-3); }

/* status bar */
.statusbar {
  display: flex; align-items: center; gap: 20px; flex: none;
  background: var(--g0); border-top: 1px solid var(--g0);
  padding: 4px 16px; font-size: 11px; color: var(--chrome-ink-2); height: 28px;
}
.sb-item { display: inline-flex; align-items: center; gap: 6px; white-space: nowrap; }
.sb-dot { width: 7px; height: 7px; border-radius: 50%; }
.sb-dot.ok { background: var(--good); box-shadow: 0 0 6px color-mix(in srgb, var(--good) 60%, transparent); }
.sb-spacer { flex: 1; }
.statusbar .mono { font-size: 10.5px; }

/* dashboard specifics */
.hero-strip { display: grid; grid-template-columns: repeat(auto-fit, minmax(170px, 1fr)); gap: 12px; margin-bottom: 16px; }
.pipeline { display: flex; gap: 0; align-items: stretch; overflow-x: auto; padding-bottom: 4px; }
.pipe-node { flex: 1; min-width: 128px; position: relative; padding: 12px 14px 12px 20px; background: var(--g2); border: 1px solid var(--line); border-right: none; }
.pipe-node:first-child { border-radius: 7px 0 0 7px; }
.pipe-node:last-child { border-right: 1px solid var(--line); border-radius: 0 7px 7px 0; }
.pipe-node .pn-state { font-family: var(--mono); font-size: 9px; letter-spacing: 0.12em; }
.pipe-node .pn-name { font-family: var(--disp); font-weight: 600; font-size: 13px; margin-top: 1px; }
.pipe-node.done .pn-state { color: var(--good); }
.pipe-node.now { background: color-mix(in srgb, var(--accent) 8%, var(--g2)); }
.pipe-node.now .pn-state { color: var(--accent); }
.pipe-node.todo .pn-state { color: var(--ink-3); }
.pipe-node.todo .pn-name { color: var(--ink-3); }

.two-col { display: grid; grid-template-columns: 3fr 2fr; gap: 14px; align-items: start; }
@media (max-width: 1100px) { .two-col { grid-template-columns: 1fr; } }

.empty-note { color: var(--ink-3); font-size: 12px; padding: 18px; text-align: center; }
.footnote { color: var(--ink-3); font-size: 11px; margin-top: 14px; }