/* ============================================================
   CE Batch 2001 · Engineering Tools Suite v3.0 — tools-suite.css
   Scoped under .eng3 — coexists with styles.css / site-chrome.css.
   Silver Jubilee identity: navy / silver / cream / gold.
   Signature: drawing-sheet title blocks on a blueprint console.
   ============================================================ */
.eng3 {
  --e3-navy-deep: #081428;
  --e3-navy: #0D2247;
  --e3-navy-2: #1B3A6B;
  --e3-silver: #A8B5C0;
  --e3-cream: #FAF7F0;
  --e3-gold: #C9A84C;
  --e3-gold-dim: rgba(201, 168, 76, .55);
  --e3-glass: rgba(13, 34, 71, .58);
  --e3-brd: rgba(168, 181, 192, .18);
  --e3-line: rgba(168, 181, 192, .12);
  --e3-ok: #4CC38A;
  --e3-err: #E5484D;
  --e3-blue: #4FB6E0;
  --e3-mut: #8FA0B3;
  --e3-shadow: 0 18px 44px rgba(3, 9, 20, .45);
  --e3-r: 14px;
  --e3-ui: "Inter", system-ui, sans-serif;
  --e3-num: "JetBrains Mono", ui-monospace, monospace;
  --e3-brand: "Playfair Display", Georgia, serif;

  font-family: var(--e3-ui);
  color: var(--e3-silver);
  line-height: 1.5;
  position: relative;
  background:
    radial-gradient(1100px 500px at 85% -5%, rgba(27, 58, 107, .55), transparent 60%),
    radial-gradient(800px 600px at -10% 30%, rgba(201, 168, 76, .07), transparent 55%),
    linear-gradient(180deg, var(--e3-navy-deep) 0%, #0B1B36 100%);
  padding-bottom: 80px;
}
.eng3 * { box-sizing: border-box; }
/* blueprint grid overlay */
.eng3::before {
  content: "";
  position: absolute; inset: 0; pointer-events: none; z-index: 0;
  background-image:
    linear-gradient(var(--e3-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--e3-line) 1px, transparent 1px);
  background-size: 96px 96px;
  opacity: .5;
}
.eng3 > * { position: relative; z-index: 1; }

.eng3 .num,
.eng3 .rrow b,
.eng3 .etab input,
.eng3 .field input,
.eng3 .tb-sheet {
  font-family: var(--e3-num);
  font-variant-numeric: tabular-nums;
  font-feature-settings: "tnum" 1;
}

.eng3-wrap { max-width: 1180px; margin: 0 auto; padding: 0 16px; }

/* ---------------- hero ---------------- */
.eng3-hero { text-align: center; padding: 52px 16px 26px; }
.eng3-hero .eb {
  display: inline-block; font: 600 11px var(--e3-ui); letter-spacing: 3px;
  color: var(--e3-gold); border: 1px solid rgba(201, 168, 76, .4);
  border-radius: 40px; padding: 6px 16px; background: rgba(201, 168, 76, .08);
  text-transform: uppercase;
}
.eng3-hero h1 {
  margin: 16px 0 10px;
  font: 700 clamp(28px, 5vw, 46px) var(--e3-brand);
  color: #fff; line-height: 1.12; letter-spacing: -.01em;
}
.eng3-hero h1 em { font-style: italic; color: var(--e3-gold); }
.eng3-hero p { max-width: 680px; margin: 0 auto; color: var(--e3-mut); font-size: 14.5px; line-height: 1.7; }
.eng3-stats { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; margin-top: 22px; }
.eng3-stat {
  background: var(--e3-glass); border: 1px solid var(--e3-brd);
  backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
  border-radius: 14px; padding: 10px 20px; font-size: 12px; color: var(--e3-mut);
}
.eng3-stat b { display: block; font: 700 20px var(--e3-brand); color: var(--e3-silver); }

/* ---------------- sticky sheet navigator ---------------- */
.eng3-bar {
  position: sticky; top: var(--topbar-h, 64px); z-index: 20;
  background: rgba(10, 22, 40, .82);
  backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  border-block: 1px solid var(--e3-brd);
  margin-top: 14px;
}
.eng3-bar-in {
  max-width: 1180px; margin: 0 auto; padding: 10px 16px;
  display: flex; gap: 8px; align-items: center; overflow-x: auto; scrollbar-width: none;
}
.eng3-bar-in::-webkit-scrollbar { display: none; }
.eng3-bar a {
  flex: none; border: 1px solid var(--e3-brd); background: transparent;
  color: var(--e3-mut); border-radius: 40px; padding: 7px 14px;
  font: 600 12px var(--e3-ui); cursor: pointer; text-decoration: none;
  transition: color .15s, border-color .15s;
}
.eng3-bar a .num { color: var(--e3-gold-dim); margin-right: 6px; font-size: 10.5px; }
.eng3-bar a:hover, .eng3-bar a:focus-visible { color: var(--e3-cream); border-color: var(--e3-silver); }
.eng3-bar a.active { color: var(--e3-gold); border-color: rgba(201, 168, 76, .6); background: rgba(201, 168, 76, .08); }

/* ---------------- sections ---------------- */
.eng3 section { padding-top: 34px; }
.eng3 .sec-head { display: flex; align-items: baseline; gap: 14px; border-bottom: 1px solid var(--e3-brd); padding-bottom: 10px; margin-bottom: 22px; }
.eng3 .sec-head .num { color: var(--e3-gold); font-size: .8rem; letter-spacing: .1em; }
.eng3 .sec-head h2 { margin: 0; color: #fff; font: 700 1.28rem var(--e3-brand); letter-spacing: .01em; }
.eng3 .sec-head p { margin: 0 0 0 auto; font-size: .78rem; color: var(--e3-mut); }

.eng3 .tool-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(360px, 1fr)); gap: 20px; }

/* ---------------- tool card = drawing sheet ---------------- */
.eng3 .tool-card {
  background: var(--e3-glass);
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--e3-brd);
  border-radius: var(--e3-r);
  box-shadow: var(--e3-shadow);
  overflow: hidden;
}
.eng3 .tool-card.wide { grid-column: 1 / -1; }
.eng3 .tool-card:focus-within { border-color: var(--e3-gold-dim); }

.eng3 .tb {
  display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 14px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--e3-brd);
  background: linear-gradient(90deg, rgba(201, 168, 76, .07), transparent 55%);
}
.eng3 .tb-id { display: grid; gap: 2px; text-align: center; padding-right: 14px; border-right: 1px solid var(--e3-brd); }
.eng3 .tb-sheet { color: var(--e3-gold); font-weight: 700; font-size: .82rem; letter-spacing: .06em; }
.eng3 .tb-rev { font-size: .58rem; letter-spacing: .18em; color: var(--e3-silver); opacity: .7; }
.eng3 .tb-name h3 { margin: 0; color: #fff; font-size: 1rem; font-weight: 600; letter-spacing: .015em; font-family: var(--e3-ui); }
.eng3 .tb-name p { margin: 2px 0 0; font-size: .74rem; color: var(--e3-mut); }
.eng3 .tb-toggle {
  background: none; border: 1px solid var(--e3-brd); color: var(--e3-gold);
  width: 32px; height: 32px; border-radius: 8px; cursor: pointer; font-size: .9rem;
}
.eng3 .tb-toggle:hover, .eng3 .tb-toggle:focus-visible { border-color: var(--e3-gold); }

.eng3 .tool-body { padding: 16px; display: grid; gap: 14px; }

/* inputs */
.eng3 .inputs { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 10px 12px; }
.eng3 .param-row { grid-column: 1 / -1; display: grid; grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: 10px 12px; }
.eng3 .field { display: grid; gap: 4px; }
.eng3 .field-label { font-size: .68rem; letter-spacing: .07em; text-transform: uppercase; color: var(--e3-gold-dim); font-weight: 600; }
.eng3 .field input, .eng3 .field select {
  width: 100%;
  background: rgba(8, 20, 40, .65);
  border: 1px solid var(--e3-brd);
  color: var(--e3-cream);
  border-radius: 8px;
  padding: 8px 10px;
  font-size: .92rem;
}
.eng3 .field select { font-family: var(--e3-ui); }
.eng3 .field input:focus-visible, .eng3 .field select:focus-visible,
.eng3 .etab input:focus-visible, .eng3 .etab select:focus-visible,
.eng3 button:focus-visible, .eng3 a:focus-visible {
  outline: 2px solid var(--e3-gold);
  outline-offset: 1px;
}
.eng3 .field input[aria-invalid="true"] { border-color: var(--e3-err); }
.eng3 .field-err { font-size: .7rem; color: var(--e3-err); }
.eng3 .field-err[hidden] { display: none; }

/* editable tables */
.eng3 .table-wrap { grid-column: 1 / -1; overflow-x: auto; }
.eng3 .etab { width: 100%; border-collapse: collapse; font-size: .84rem; }
.eng3 .etab caption { text-align: left; font-size: .68rem; letter-spacing: .12em; text-transform: uppercase; color: var(--e3-gold-dim); padding-bottom: 6px; font-weight: 600; }
.eng3 .etab th { text-align: left; font-weight: 500; font-size: .7rem; letter-spacing: .06em; color: var(--e3-silver); padding: 4px 6px; border-bottom: 1px solid var(--e3-brd); }
.eng3 .etab td { padding: 4px 6px; }
.eng3 .etab input, .eng3 .etab select {
  width: 100%; min-width: 74px;
  background: rgba(8, 20, 40, .55); border: 1px solid var(--e3-brd);
  color: var(--e3-cream); border-radius: 6px; padding: 6px 8px; font-size: .84rem;
}
.eng3 .etab input:disabled { opacity: .3; }
.eng3 .btn-add {
  margin-top: 8px;
  background: none; border: 1px dashed var(--e3-gold-dim); color: var(--e3-gold);
  border-radius: 8px; padding: 6px 14px; cursor: pointer; font: 600 .8rem var(--e3-ui);
}
.eng3 .btn-add:hover { border-style: solid; }
.eng3 .btn-x {
  background: none; border: none; color: var(--e3-err); cursor: pointer;
  font-size: 1rem; padding: 4px 8px; border-radius: 6px;
}
.eng3 .btn-x:hover { background: rgba(229, 72, 77, .12); }

/* custom combos */
.eng3 .cust-combos { grid-column: 1 / -1; }
.eng3 .cust-row { display: flex; flex-wrap: wrap; gap: 8px; align-items: end; padding: 8px 0; border-bottom: 1px dashed var(--e3-line); }
.eng3 .mini { display: grid; gap: 2px; }
.eng3 .mini span { font-size: .64rem; color: var(--e3-gold-dim); letter-spacing: .08em; font-weight: 600; }
.eng3 .mini input { width: 78px; background: rgba(8,20,40,.55); border: 1px solid var(--e3-brd); color: var(--e3-cream); border-radius: 6px; padding: 6px; font-family: var(--e3-num); }

/* diagrams */
.eng3 .diagrams { display: grid; gap: 10px; }
.eng3 .dslot { background: rgba(8, 20, 40, .5); border: 1px solid var(--e3-line); border-radius: 10px; padding: 6px; }
.eng3 .dslot:empty { display: none; }
.eng3 .dslot svg { display: block; }

/* results */
.eng3 .results { display: grid; gap: 6px; }
.eng3 .rrow {
  display: flex; justify-content: space-between; align-items: baseline; gap: 14px;
  padding: 7px 12px;
  background: rgba(8, 20, 40, .45);
  border: 1px solid var(--e3-line);
  border-radius: 8px;
  font-size: .86rem;
}
.eng3 .rrow span { color: var(--e3-silver); }
.eng3 .rrow b { color: var(--e3-cream); font-weight: 600; white-space: nowrap; }
.eng3 .rrow b i { font-style: normal; color: var(--e3-gold-dim); margin-left: 5px; font-size: .78rem; }
.eng3 .rrow.ok { border-left: 3px solid var(--e3-ok); }
.eng3 .rrow.err { border-left: 3px solid var(--e3-err); }
.eng3 .verdict { padding: 10px 14px; border-radius: 9px; font-weight: 600; font-size: .88rem; }
.eng3 .v-ok { background: rgba(76, 195, 138, .12); color: var(--e3-ok); border: 1px solid rgba(76, 195, 138, .4); }
.eng3 .v-err { background: rgba(229, 72, 77, .12); color: var(--e3-err); border: 1px solid rgba(229, 72, 77, .4); }
.eng3 .note { font-size: .74rem; color: var(--e3-mut); margin: 4px 2px 0; }
.eng3 .err-banner {
  grid-column: 1 / -1;
  background: rgba(229, 72, 77, .12); border: 1px solid rgba(229, 72, 77, .45);
  color: var(--e3-err); border-radius: 9px; padding: 10px 14px; font-size: .86rem;
}
.eng3 .err-banner[hidden] { display: none; }

/* reference table (material library) */
.eng3 .reftab { width: 100%; border-collapse: collapse; font-size: .82rem; }
.eng3 .reftab th { color: var(--e3-gold); font-weight: 600; font-size: .7rem; letter-spacing: .08em; text-transform: uppercase; text-align: left; padding: 6px 8px; border-bottom: 1px solid var(--e3-brd); }
.eng3 .reftab td { padding: 5px 8px; border-bottom: 1px dashed var(--e3-line); color: var(--e3-cream); font-family: var(--e3-num); font-variant-numeric: tabular-nums; }
.eng3 .reftab td:first-child { font-family: var(--e3-ui); color: var(--e3-silver); }

/* disclaimer strip */
.eng3 .card-foot { display: flex; justify-content: flex-end; }
.eng3 .eprint {
  display: inline-flex; align-items: center; gap: 6px;
  border: 1px solid var(--e3-brd); background: transparent; color: var(--e3-mut);
  border-radius: 40px; padding: 7px 16px;
  font: 600 11.5px var(--e3-ui); cursor: pointer;
  transition: color .15s, border-color .15s;
}
.eng3 .eprint:hover, .eng3 .eprint:focus-visible { color: var(--e3-gold); border-color: rgba(201, 168, 76, .5); }
.eng3 .enote {
  max-width: 1180px; margin: 40px auto 0; padding: 12px 16px;
  font-size: .76rem; color: var(--e3-mut);
  border: 1px dashed var(--e3-brd); border-radius: 10px;
}

/* ---------------- responsive ---------------- */
@media (max-width: 1020px) {
  .eng3 .tool-grid { grid-template-columns: 1fr; }
  .eng3 .sec-head p { display: none; }
}
@media (max-width: 560px) {
  .eng3 .inputs, .eng3 .param-row { grid-template-columns: repeat(2, 1fr); }
  .eng3 .rrow { flex-direction: column; gap: 2px; }
  .eng3 .rrow b { white-space: normal; }
}
@media (prefers-reduced-motion: reduce) {
  .eng3 *, .eng3 *::before, .eng3 *::after { animation: none !important; transition: none !important; }
}

/* ---------------- print: A4 calc sheet ---------------- */
@media print {
  #site-header-include, #site-footer-include, .eng3-bar, .eng3 .btn-add, .eng3 .btn-x, .eng3 .tb-toggle, .eng3 .eprint { display: none !important; }
  .eng3 { background: #fff; color: #111; padding-bottom: 0; }
  .eng3::before { display: none; }
  .eng3 .tool-card { break-inside: avoid; box-shadow: none; background: #fff; border: 1.2pt solid #0D2247; border-radius: 0; margin-bottom: 8mm; }
  .eng3 .tb { background: #fff; border-bottom: 1.2pt solid #0D2247; }
  .eng3 .tb-name h3, .eng3-hero h1, .eng3 .sec-head h2 { color: #0D2247; }
  .eng3 .tb-sheet, .eng3 .sec-head .num { color: #0D2247; }
  .eng3 .rrow, .eng3 .dslot { background: #fff; border-color: #999; }
  .eng3 .rrow span { color: #333; }
  .eng3 .rrow b { color: #000; }
  .eng3 .field input, .eng3 .field select, .eng3 .etab input, .eng3 .etab select { background: #fff; color: #000; border-color: #888; }
  .eng3-hero p, .eng3 .note, .eng3 .enote { color: #444; }
  .eng3-hero .eb { color: #0D2247; border-color: #0D2247; background: none; }
  .eng3-stat { background: none; border-color: #888; color: #333; }
  .eng3-stat b { color: #0D2247; }
  @page { size: A4; margin: 14mm; }
}

/* ---------- Material Manager & sync pill (v3.3) ---------- */
.eng3 .mat-pill {
  margin-left: auto; display: inline-flex; align-items: center; gap: 7px;
  border: 1px solid var(--e3-brd); background: transparent; color: var(--e3-mut);
  border-radius: 40px; padding: 5px 13px; font: 600 10.5px var(--e3-ui);
  letter-spacing: .6px; cursor: pointer; white-space: nowrap;
}
.eng3 .mat-pill i { width: 7px; height: 7px; border-radius: 50%; background: currentColor; flex: none; }
.eng3 .mat-pill.on    { color: #4FB6A8; border-color: rgba(79,182,168,.45); }
.eng3 .mat-pill.cache { color: var(--e3-gold); border-color: rgba(201,168,76,.45); }
.eng3 .mat-pill.sync  { color: #4FB6E0; border-color: rgba(79,182,224,.45); }
.eng3 .mat-pill.off   { color: var(--e3-mut); }
.eng3 .mat-pill.err   { color: #E08A4F; border-color: rgba(224,138,79,.45); }
.eng3 .mat-pill:hover { border-color: var(--e3-gold); }

.eng3 .matman-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
@media (max-width: 720px) { .eng3 .matman-row { grid-template-columns: 1fr; } }
.eng3 .matman-src {
  display: flex; flex-wrap: wrap; gap: 4px 16px; align-items: baseline;
  margin: 12px 0 4px; padding: 9px 13px; border-radius: 6px;
  border: 1px solid var(--e3-brd); border-left: 3px solid var(--e3-mut);
  background: rgba(255,255,255,.02); font: 11px/1.6 var(--e3-ui); color: var(--e3-mut);
}
.eng3 .matman-src strong { color: var(--e3-cream); letter-spacing: .5px; font-size: 10.5px; }
.eng3 .matman-src.online  { border-left-color: #4FB6A8; }
.eng3 .matman-src.cached  { border-left-color: var(--e3-gold); }
.eng3 .matman-src.syncing { border-left-color: #4FB6E0; }
.eng3 .matman-src.offline, .eng3 .matman-src.idle { border-left-color: var(--e3-mut); }
.eng3 .matman-src.error   { border-left-color: #E08A4F; }
.eng3 .matman-counts { font-family: var(--e3-mono); font-size: 10px; opacity: .8; }
.eng3 .matman-err { color: #E08A4F; font-family: var(--e3-mono); font-size: 10px; }
.eng3 .matman-preview h4 {
  margin: 14px 0 6px; font: 600 11px var(--e3-ui); letter-spacing: 1px;
  text-transform: uppercase; color: var(--e3-gold);
}