@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&family=JetBrains+Mono:wght@400;500;600&family=Sarabun:wght@300;400;500;600;700;800&display=swap');

/* ============================================================================
 * peb-eng-theme.css — "Structure Design Suite" professional engineering theme
 *
 * Loaded by: peb-calculator/index.html  (PEB only — NOT the Truss app)
 * Look:      Deep space-navy surfaces • cyan/teal + electric-blue accents •
 *            thin luminous hairlines • CAD-precise controls • tabular numerics •
 *            calm, no skew, no shout. Reads like Tekla / SAP2000 / IDEA StatiCa.
 *
 * Strategy:  drop-in replacement for fut-theme.css — SAME selectors & !important
 *            footprint (so theme-switcher OS themes still override identically),
 *            only the aesthetic changes. Hijack the program's own CSS variables
 *            at :root, then override the bits that use fixed colors.
 * ========================================================================== */

/* ============================================================
 * 1. Design tokens
 * ========================================================================== */
:root{
  color-scheme: dark !important;

  /* surfaces */
  --eng-bg-0: #060D16;          /* deepest backdrop */
  --eng-bg-1: #081019;          /* base canvas */
  --eng-bg-2: #101C28;          /* panel */
  --eng-bg-3: #162433;          /* card / raised */
  --eng-bg-4: #1C2E40;          /* hover / header stripe */
  --eng-glass: rgba(16, 28, 40, 0.82);

  /* brand accents */
  --eng-primary:      #00E5C3;  /* teal-cyan — primary */
  --eng-primary-br:   #4FFFE6;
  --eng-primary-dim:  #00B49B;
  --eng-secondary:    #00B4FF;  /* electric blue — rafter/secondary */
  --eng-ok:           #42D392;  /* pass / column green */
  --eng-warn:         #F4C542;  /* caution amber */
  --eng-danger:       #FF5D73;  /* fail red */
  --eng-purple:       #B388FF;  /* girt / tertiary */

  /* gradients */
  --eng-grad:      linear-gradient(120deg, var(--eng-primary) 0%, var(--eng-secondary) 100%);
  --eng-grad-soft: linear-gradient(120deg, rgba(0,229,195,.16), rgba(0,180,255,.12));

  /* text */
  --eng-text:       #F5F8FA;
  --eng-text-2:     #9FB3C8;
  --eng-text-mute:  #617185;
  --eng-text-faint: #43536A;

  /* lines / glows */
  --eng-line:        rgba(0, 229, 195, 0.15);
  --eng-line-2:      rgba(0, 229, 195, 0.30);
  --eng-glow:        0 0 0 1px rgba(0,229,195,.28), 0 0 16px rgba(0,229,195,.16);
  --eng-shadow:      0 10px 30px rgba(0,0,0,.55), 0 0 0 0.5px rgba(0,229,195,.10);

  --font-head: "Inter", "Segoe UI", "Sarabun", system-ui, -apple-system, sans-serif;
  --font-body: "Inter", "Segoe UI", "Sarabun", system-ui, -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", "Consolas", ui-monospace, Menlo, monospace;

  /* ---- hijack PEB variables ---- */
  --bg: var(--eng-bg-1) !important;
  --ink: var(--eng-text) !important;
  --muted: var(--eng-text-mute) !important;
  --card: var(--eng-bg-3) !important;
  --line: var(--eng-line) !important;
  --accent: var(--eng-primary) !important;
  --ok: var(--eng-ok) !important;
  --bad: var(--eng-danger) !important;
  --warn: var(--eng-warn) !important;
  --col-rafter: var(--eng-secondary) !important;
  --col-col: var(--eng-ok) !important;

  /* ---- hijack Purlin/shared variables (harmless if unused) ---- */
  --panel: var(--eng-bg-2) !important;
  --panel-2: var(--eng-bg-3) !important;
  --accent-2: var(--eng-secondary) !important;
  --good: var(--eng-ok) !important;
  --text: var(--eng-text) !important;
  --border: var(--eng-line) !important;
}

/* ============================================================
 * 2. Document & body — deep navy field, faint blueprint glow
 * ========================================================================== */
html{ color-scheme: dark !important; }
html, body{
  font-family: var(--font-body) !important;
  font-size: 13.5px !important;
  color: var(--eng-text) !important;
  background:
    radial-gradient(1200px 640px at 8% -10%, rgba(0,229,195,.08), transparent 58%),
    radial-gradient(1000px 600px at 100% 108%, rgba(0,180,255,.07), transparent 55%),
    linear-gradient(180deg, var(--eng-bg-1) 0%, var(--eng-bg-0) 100%) !important;
  background-attachment: fixed !important;
  -webkit-font-smoothing: antialiased !important;
  text-rendering: optimizeLegibility !important;
  letter-spacing: 0 !important;
}

/* faint precision grid on the main scroller */
section.main{
  background-image:
    linear-gradient(rgba(0,229,195,.030) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,229,195,.030) 1px, transparent 1px) !important;
  background-size: 26px 26px !important;
}

/* ============================================================
 * 3. Headings — clean, tight, no shout
 * ========================================================================== */
h1, h2, h3, h4, h5, h6{
  font-family: var(--font-head) !important;
  color: var(--eng-text) !important;
  font-weight: 700 !important;
  text-transform: none !important;
  letter-spacing: 0.005em !important;
  line-height: 1.12 !important;
}
h1{ font-size: 20px !important; font-weight: 700 !important; }
h2{ font-size: 17px !important; }
h3{ font-size: 12px !important; text-transform: uppercase !important; letter-spacing: .1em !important;
    color: var(--eng-primary) !important; font-weight: 700 !important; }
h4{ font-size: 13px !important; }

.small, .muted, .sub, .mute{ color: var(--eng-text-mute) !important; }
.mono{ font-family: var(--font-mono) !important; font-variant-numeric: tabular-nums !important; }

/* semantic colors */
.ok  { color: var(--eng-ok)     !important; }
.bad { color: var(--eng-danger) !important; }
.warn{ color: var(--eng-warn)   !important; }
.ten { color: var(--eng-danger) !important; }
.com { color: var(--eng-ok)     !important; }

/* ============================================================
 * 4. Form controls — CAD-precise dark fields
 * ========================================================================== */
input[type="text"], input[type="number"], input[type="date"], input[type="email"],
input[type="search"], input:not([type]), select, textarea,
.input, .select, .field input, .field select{
  font-family: var(--font-body) !important;
  font-size: 12.5px !important;
  font-weight: 500 !important;
  color: var(--eng-text) !important;
  background: rgba(6, 13, 22, 0.90) !important;
  border: 1px solid var(--eng-line) !important;
  border-radius: 5px !important;
  padding: 5px 9px !important;
  min-height: 27px !important;
  line-height: 1.4 !important;
  outline: none !important;
  -webkit-appearance: none !important;
  appearance: none !important;
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.015) !important;
  transition: border-color .14s, box-shadow .14s, background .14s !important;
}
/* numeric fields read as data */
input[type="number"], .field input[type="number"]{
  font-family: var(--font-mono) !important;
  font-variant-numeric: tabular-nums !important;
  text-align: right !important;
}
input::placeholder, textarea::placeholder{ color: var(--eng-text-faint) !important; }

input:focus, select:focus, textarea:focus,
.input:focus, .select:focus, .field input:focus, .field select:focus{
  border-color: var(--eng-primary) !important;
  background: rgba(8, 18, 28, 0.98) !important;
  box-shadow: 0 0 0 3px rgba(0,229,195,.16), 0 0 12px rgba(0,229,195,.16) !important;
}

/* dropdown options stay readable on dark */
select option{ background: #0B1622 !important; color: var(--eng-text) !important; }

/* checkbox / radio */
input[type="checkbox"], input[type="radio"]{
  -webkit-appearance: none !important; appearance: none !important;
  width: 15px !important; height: 15px !important; min-height: 15px !important;
  border: 1px solid var(--eng-line-2) !important;
  border-radius: 4px !important;
  background: rgba(6,13,22,.9) !important;
  cursor: pointer !important; position: relative !important;
  vertical-align: middle !important; padding: 0 !important;
  transition: .14s !important;
}
input[type="radio"]{ border-radius: 50% !important; }
input[type="checkbox"]:checked, input[type="radio"]:checked{
  background: var(--eng-grad) !important;
  border-color: var(--eng-primary) !important;
  box-shadow: 0 0 8px rgba(0,229,195,.40) !important;
}
input[type="checkbox"]:checked::after{
  content:""; position:absolute; left:4px; top:1px;
  width:4px; height:8px; border: solid #061018; border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}
input[type="radio"]:checked::after{
  content:""; position:absolute; inset:3.5px; background:#061018; border-radius:50%;
}

/* range slider */
input[type="range"]{
  -webkit-appearance:none !important; appearance:none !important;
  height:4px !important; padding:0 !important; border:0 !important;
  background: linear-gradient(90deg, var(--eng-primary), var(--eng-secondary)) !important;
  border-radius:2px !important; box-shadow:none !important; min-height:4px !important;
}
input[type="range"]::-webkit-slider-thumb{
  -webkit-appearance:none !important; width:15px !important; height:15px !important;
  border-radius:50% !important; background:#EAFFFB !important;
  border:2px solid var(--eng-primary) !important;
  box-shadow:0 0 8px rgba(0,229,195,.55) !important; cursor:pointer !important;
}

/* ============================================================
 * 5. Buttons — flat rectangles, luminous edge (NO skew)
 * ========================================================================== */
button, .btn{
  position: relative !important;
  font-family: var(--font-head) !important;
  font-size: 12.5px !important;
  font-weight: 600 !important;
  text-transform: none !important;
  letter-spacing: 0.01em !important;
  color: var(--eng-text) !important;
  padding: 7px 15px !important;
  min-height: 30px !important;
  line-height: 1.2 !important;
  border: 1px solid var(--eng-line-2) !important;
  border-radius: 6px !important;
  cursor: pointer !important;
  background: rgba(16, 28, 40, 0.92) !important;
  clip-path: none !important;
  box-shadow: inset 0 1px 0 rgba(255,255,255,.03) !important;
  transition: filter .14s, background .14s, transform .06s, box-shadow .14s, border-color .14s !important;
}
button:hover, .btn:hover{
  background: rgba(28, 46, 64, 0.98) !important;
  border-color: var(--eng-primary) !important;
  box-shadow: 0 0 14px rgba(0,229,195,.18) !important;
}
button:active, .btn:active{ transform: translateY(1px) !important; }
button:disabled, .btn:disabled{ opacity:.4 !important; cursor:default !important; filter:none !important; }

/* primary / accent buttons (filled) */
button.btn-primary, .btn.btn-primary, button.primary, button[data-variant="primary"],
button#btn-unified-pdf, button#btn-pdf, button#btn-report,
button[onclick*="export"], button[onclick*="calculate"], button[onclick*="recalc"]{
  color: #05131A !important;
  background: var(--eng-grad) !important;
  border-color: transparent !important;
  box-shadow: 0 0 16px rgba(0,229,195,.28), inset 0 0 0 1px rgba(255,255,255,.16) !important;
  text-shadow: none !important;
}
button.btn-primary:hover, .btn.btn-primary:hover,
button#btn-unified-pdf:hover, button[onclick*="export"]:hover{
  filter: brightness(1.06) saturate(1.05) !important;
  box-shadow: 0 0 24px rgba(0,229,195,.44), inset 0 0 0 1px rgba(255,255,255,.22) !important;
}

/* secondary / ghost */
.btn-secondary, button.btn-secondary{
  background: rgba(11, 22, 34, 0.92) !important;
  color: var(--eng-text-2) !important;
  border: 1px solid var(--eng-line) !important;
}
.btn-secondary:hover, button.btn-secondary:hover{ color: var(--eng-text) !important; }
.btn-ghost{
  background: rgba(11, 22, 34, 0.55) !important;
  color: var(--eng-primary) !important;
  border: 1px solid var(--eng-line-2) !important;
}
.btn-ghost:hover{ color: var(--eng-primary-br) !important; }

/* small view buttons (PEB 3D view toggles) — segmented control */
.view-btn, button.view-btn{
  font-family: var(--font-head) !important; font-size: 11.5px !important; font-weight: 600 !important;
  letter-spacing: .01em !important; padding: 5px 11px !important; min-height: 26px !important;
  background: rgba(11,22,34,.85) !important; color: var(--eng-text-2) !important;
  border: 1px solid var(--eng-line) !important; border-radius: 5px !important;
  clip-path: none !important; text-transform: none !important;
}
.view-btn:hover, button.view-btn:hover{ color: var(--eng-text) !important; border-color: var(--eng-line-2) !important; }
.view-btn.active, button.view-btn.active{
  background: var(--eng-grad) !important; color:#05131A !important; border-color: transparent !important;
  box-shadow: 0 0 12px rgba(0,229,195,.32) !important;
}

/* ============================================================
 * 6. Tabs — workflow steps with cyan underline glow
 * ========================================================================== */
.tabs{ border-bottom: 1px solid var(--eng-line) !important; gap: 2px !important; }
.tab{
  font-family: var(--font-head) !important;
  font-weight: 600 !important; text-transform: none !important;
  letter-spacing: .01em !important; font-size: 13px !important;
  color: var(--eng-text-mute) !important;
  background: transparent !important; border: 1px solid transparent !important;
  border-bottom: none !important;
  padding: 8px 16px !important; position: relative !important; top: 0 !important;
  border-radius: 6px 6px 0 0 !important;
  white-space: nowrap !important;
}
.tab:hover{ color: var(--eng-text-2) !important; background: rgba(0,229,195,.05) !important; }
.tab.active{
  color: var(--eng-primary-br) !important;
  background: linear-gradient(180deg, rgba(0,229,195,.10), transparent) !important;
  border-color: transparent !important; top: 0 !important;
}
.tab.active::after{
  content:""; position:absolute; left:6px; right:6px; bottom:-1px; height:2px;
  background: var(--eng-grad);
  box-shadow: 0 0 10px rgba(0,229,195,.65);
  border-radius: 2px;
}

/* ============================================================
 * 7. Panels, cards, sections — dark glass + hairline edge
 * ========================================================================== */
.panel, .section, .card, .svg-container{
  background: var(--eng-glass) !important;
  border: 1px solid var(--eng-line) !important;
  border-radius: 8px !important;
  color: var(--eng-text) !important;
  -webkit-backdrop-filter: blur(6px) !important;
  backdrop-filter: blur(6px) !important;
  box-shadow: var(--eng-shadow) !important;
}
/* tab content panels: square the top so they meet the tab strip */
.panel{ position: relative !important; padding: 16px !important; border-radius: 0 0 8px 8px !important; overflow: visible !important; }
.card{ position: relative !important; }
.card::before{
  content:""; position:absolute; left:12px; right:12px; top:-1px; height:2px;
  background: var(--eng-grad); opacity:.85;
  box-shadow: 0 0 10px rgba(0,229,195,.40);
  border-radius: 2px;
}

.panel h3, .panel h4, .section-title{ color: var(--eng-text) !important; }
.section-title{
  font-family: var(--font-head) !important;
  color: var(--eng-primary) !important;
  font-weight: 700 !important; letter-spacing: .1em !important;
  text-transform: uppercase !important; font-size: 11.5px !important;
}

/* stat cards */
.card .label{ color: var(--eng-text-mute) !important; font-family: var(--font-head) !important;
  text-transform: uppercase !important; letter-spacing: .08em !important; font-size: 10.5px !important; font-weight:600 !important; }
.card .value{ color: var(--eng-text) !important; font-family: var(--font-mono) !important;
  font-variant-numeric: tabular-nums !important; font-weight: 600 !important; font-size: 21px !important; }
.card .unit{ color: var(--eng-text-mute) !important; font-weight:500 !important; }
.card.good{ border-left: 3px solid var(--eng-ok)     !important; }
.card.warn{ border-left: 3px solid var(--eng-warn)   !important; }
.card.bad { border-left: 3px solid var(--eng-danger) !important; }
.card.good::before{ background: var(--eng-ok)     !important; }
.card.bad::before { background: var(--eng-danger) !important; }
.card.warn::before{ background: var(--eng-warn)   !important; }

/* metric chip (PEB) */
.metric{
  background: rgba(11,22,34,.85) !important;
  border: 1px solid var(--eng-line) !important;
  border-radius: 7px !important; padding: 8px 13px !important;
}
.metric .v{ color: var(--eng-primary) !important; font-family: var(--font-mono) !important;
  font-variant-numeric: tabular-nums !important; font-weight:600 !important; }
.metric .l{ color: var(--eng-text-mute) !important; }

/* note / callout */
.note{
  background: linear-gradient(180deg, rgba(244,197,66,.10), rgba(244,197,66,.03)) !important;
  border-left: 3px solid var(--eng-warn) !important;
  color: var(--eng-text-2) !important; border-radius: 7px !important;
}

/* ============================================================
 * 8. Tables — engineering data grid
 * ========================================================================== */
table, .tbl, table.r{
  background: rgba(8, 16, 25, 0.62) !important;
  border: 1px solid var(--eng-line) !important;
  border-collapse: separate !important; border-spacing: 0 !important;
  border-radius: 8px !important; overflow: hidden !important;
  font-size: 12px !important;
}
th, td, .tbl th, .tbl td, table.r th, table.r td{
  border: 0 !important;
  border-bottom: 1px solid rgba(0,229,195,.08) !important;
  padding: 7px 10px !important; color: var(--eng-text) !important;
  text-align: left !important; vertical-align: middle !important;
}
tr:last-child td{ border-bottom: 0 !important; }
th, .tbl th, table.r th{
  position: sticky !important; top: 0 !important; z-index: 2 !important;
  background: linear-gradient(180deg, var(--eng-bg-4), var(--eng-bg-3)) !important;
  color: var(--eng-primary) !important;
  font-family: var(--font-head) !important; font-weight: 700 !important;
  text-transform: uppercase !important; letter-spacing: .05em !important;
  font-size: 10.5px !important;
}
tbody tr:nth-child(even) td{ background: rgba(0,229,195,.022) !important; }
tbody tr:hover td, .tbl tr:hover td, table.r tr:hover td{
  background: rgba(0,229,195,.07) !important;
}
.num, td.num, th.num, td.r, th.r, td.c, th.c{
  font-family: var(--font-mono) !important; font-variant-numeric: tabular-nums !important;
}

/* ============================================================
 * 9. Status pills / badges — flat rounded (NO skew)
 * ========================================================================== */
.status, .badge{
  font-family: var(--font-head) !important; font-weight: 700 !important;
  text-transform: uppercase !important; letter-spacing: .06em !important;
  font-size: 10.5px !important; padding: 3px 11px !important;
  border-radius: 999px !important; clip-path: none !important;
}
.status.pass, .badge.ok{ background: rgba(66,211,146,.16) !important; color: var(--eng-ok) !important;
  box-shadow: inset 0 0 0 1px rgba(66,211,146,.5) !important; }
.status.fail, .badge.no{ background: rgba(255,93,115,.16) !important; color: var(--eng-danger) !important;
  box-shadow: inset 0 0 0 1px rgba(255,93,115,.5) !important; }

.chip{
  background: rgba(11,22,34,.85) !important; color: var(--eng-text-2) !important;
  border: 1px solid var(--eng-line) !important; border-radius: 999px !important;
  font-family: var(--font-head) !important; text-transform: none !important;
  letter-spacing: .01em !important; font-size: 11px !important; font-weight:500 !important;
}

/* formula box */
.formula{
  background: rgba(6,13,22,.85) !important; color: var(--eng-text) !important;
  border-left: 3px solid var(--eng-primary) !important; border-radius: 7px !important;
  font-family: var(--font-mono) !important;
}
.formula-title{ color: var(--eng-primary) !important; font-family: var(--font-head) !important;
  text-transform: uppercase !important; letter-spacing:.05em !important; font-weight:700 !important; }

/* ============================================================
 * 10. Program chrome — ribbon header, property sidebar, back bar
 * ========================================================================== */
/* ---- top back bar → engineered strip ---- */
.suite-backbar{
  background: linear-gradient(180deg, var(--eng-bg-2), var(--eng-bg-0)) !important;
  color: var(--eng-text) !important;
  border-bottom: 1px solid var(--eng-line-2) !important;
  box-shadow: 0 1px 0 rgba(0,229,195,.06) !important;
}
.suite-backbar .back-link{
  background: rgba(0,229,195,.10) !important; color: var(--eng-primary) !important;
  border: 1px solid var(--eng-line-2) !important;
}
.suite-backbar .back-link:hover{ background: rgba(0,229,195,.18) !important; color: var(--eng-primary-br) !important; }
.suite-backbar .suite-name{ color: var(--eng-text-2) !important; }

/* ---- PEB header → ribbon ---- */
body > header{
  background: linear-gradient(120deg, var(--eng-bg-2), var(--eng-bg-3)) !important;
  color: var(--eng-text) !important;
  border-bottom: 1px solid var(--eng-line-2) !important;
  box-shadow: 0 2px 20px rgba(0,0,0,.45), 0 0 0 0 rgba(0,229,195,.10) !important;
  position: relative !important;
}
body > header::before{
  content:""; position:absolute; left:0; top:0; bottom:0; width:3px;
  background: var(--eng-grad); box-shadow: 0 0 14px rgba(0,229,195,.5);
}
body > header h1{ font-family: var(--font-head) !important; color: var(--eng-text) !important;
  text-transform: none !important; letter-spacing:.01em !important; font-weight: 700 !important; }
body > header .sub{ color: var(--eng-text-mute) !important; }
body > header .sub b{ color: var(--eng-warn) !important; }

/* ---- property sidebar ---- */
aside, .sidebar{
  background: linear-gradient(180deg, var(--eng-bg-2), var(--eng-bg-0)) !important;
  border-right: 1px solid var(--eng-line) !important;
  color: var(--eng-text) !important;
}
aside h3{
  font-family: var(--font-head) !important; color: var(--eng-primary) !important;
  text-transform: uppercase !important; letter-spacing:.1em !important;
  font-weight: 700 !important; font-size: 11px !important;
  padding-bottom: 4px !important; border-bottom: 1px solid var(--eng-line) !important;
}
.field label{ color: var(--eng-text-2) !important; }
.field .unit{ color: var(--eng-text-mute) !important; }
.legend{ color: var(--eng-text-2) !important; }

/* ============================================================
 * 11. Diagrams, overlays, details, scrollbars, misc
 * ========================================================================== */
/* SFD/BMD/axial + section svg → dark viewport panel */
svg{
  background: #0A1420 !important;
  border: 1px solid var(--eng-line) !important;
  border-radius: 8px !important;
}

.loading{ background: rgba(4,10,17,.85) !important; -webkit-backdrop-filter: blur(8px) !important; backdrop-filter: blur(8px) !important; }
.spinner{ border-color: rgba(0,229,195,.15) !important; border-top-color: var(--eng-primary) !important; }

details > summary{ color: var(--eng-primary) !important; font-weight: 600 !important; }
details > summary::before{ color: var(--eng-primary) !important; }

code, pre{
  font-family: var(--font-mono) !important; color: var(--eng-text) !important;
  background: rgba(6,13,22,.8) !important; border-radius: 5px !important; padding: 1px 5px !important;
}
pre{ padding: 10px 12px !important; border:1px solid var(--eng-line) !important; }

::selection{ background: rgba(0,229,195,.28) !important; color: #05131A !important; }

*::-webkit-scrollbar{ width: 11px !important; height: 11px !important; }
*::-webkit-scrollbar-track{ background: transparent !important; }
*::-webkit-scrollbar-thumb{
  background: linear-gradient(180deg, var(--eng-primary-dim), #0a5f68) !important;
  background-clip: padding-box !important; border: 2.5px solid transparent !important;
  border-radius: 11px !important; min-height: 30px !important;
}
*::-webkit-scrollbar-thumb:hover{ background: var(--eng-primary) !important; background-clip: padding-box !important; }
*::-webkit-scrollbar-corner{ background: transparent !important; }

/* ============================================================================
 * 12. APP SHELL (Phase 2) — ribbon · workflow · 3-panel · status bar
 *     Flex column shell so panel heights auto-fit (no 100vh-Npx guessing).
 * ========================================================================== */
html, body{ height: 100% !important; }
body{
  display: flex !important; flex-direction: column !important;
  height: 100vh !important; overflow: hidden !important;
}
.suite-backbar, .ribbon, body > header, .statusbar{ flex: 0 0 auto !important; }

/* main becomes the flexible middle band; 3-column workspace */
main{
  flex: 1 1 auto !important; min-height: 0 !important;
  grid-template-columns: 302px minmax(0, 1fr) 320px !important;
  min-height: 0 !important;
}
/* every workspace column fills the band and scrolls on its own */
main > aside, main > section.main, main > .eng-rail{
  height: 100% !important; max-height: none !important; min-height: 0 !important;
  overflow-y: auto !important; padding-bottom: 20px !important;
}

@media print{
  body{ display: block !important; height: auto !important; overflow: visible !important; }
  main{ display: block !important; }
  main > section.main{ display: block !important; overflow: visible !important; height: auto !important; }
  .viewport-3d, .tabs{ display: none !important; }   /* WebGL canvas พิมพ์ไม่ติด — พิมพ์เฉพาะผลลัพธ์ */
  .panel.active{ overflow: visible !important; }
  .no-print{ display: none !important; }
}

/* ---- Ribbon (top toolbar) ------------------------------------------------ */
.ribbon{
  display: flex; align-items: center; gap: 14px;
  padding: 8px 16px;
  background: linear-gradient(120deg, var(--eng-bg-2), var(--eng-bg-3)) !important;
  border-bottom: 1px solid var(--eng-line-2);
  box-shadow: 0 2px 18px rgba(0,0,0,.4);
}
.ribbon .rb-brand{ display: flex; align-items: center; gap: 11px; }
.ribbon .rb-logo{
  width: 34px; height: 34px; border-radius: 8px; flex: 0 0 auto;
  display: grid; place-items: center; font-size: 18px; color: #05131A;
  background: var(--eng-grad); box-shadow: 0 0 16px rgba(0,229,195,.4);
}
.ribbon .rb-name{
  font: 800 15px/1 var(--font-head); letter-spacing: .14em; color: var(--eng-text);
}
.ribbon .rb-name b{ color: var(--eng-primary); font-weight: 800; }
.ribbon .rb-sub{
  font: 600 10px/1.4 var(--font-head); letter-spacing: .22em; text-transform: uppercase;
  color: var(--eng-text-mute); margin-top: 3px;
}
.ribbon .rb-actions{ margin-left: auto; display: flex; align-items: center; gap: 8px; }
.ribbon .rb-btn{
  font: 600 12px/1 var(--font-head) !important; letter-spacing: .02em !important;
  color: var(--eng-text-2) !important; background: rgba(6,13,22,.6) !important;
  border: 1px solid var(--eng-line) !important; border-radius: 7px !important;
  padding: 8px 13px !important; min-height: 32px !important; text-transform: none !important;
  display: inline-flex; align-items: center; gap: 6px;
}
.ribbon .rb-btn:hover{ color: var(--eng-text) !important; border-color: var(--eng-line-2) !important;
  background: rgba(16,28,40,.9) !important; box-shadow: 0 0 12px rgba(0,229,195,.16) !important; }
.ribbon .rb-btn.rb-primary{
  color: #05131A !important; background: var(--eng-grad) !important; border-color: transparent !important;
  box-shadow: 0 0 16px rgba(0,229,195,.3) !important;
}
.ribbon .rb-btn.rb-primary:hover{ filter: brightness(1.07) !important; }

/* ---- Workflow numbering on the tab strip --------------------------------- */
.tabs{ counter-reset: wf !important; align-items: stretch !important; }
.tab{ display: inline-flex !important; align-items: center !important; gap: 8px !important; }
.tab::before{
  counter-increment: wf;
  content: counter(wf, decimal-leading-zero);
  font: 700 10px/1 var(--font-mono); letter-spacing: .05em;
  color: var(--eng-text-faint);
  border: 1px solid var(--eng-line); border-radius: 5px;
  padding: 3px 5px; transition: .14s;
}
.tab:hover::before{ color: var(--eng-text-2); border-color: var(--eng-line-2); }
.tab.active::before{
  color: #05131A; background: var(--eng-grad); border-color: transparent;
  box-shadow: 0 0 8px rgba(0,229,195,.4);
}

/* ---- Right engineering rail --------------------------------------------- */
.eng-rail{
  background: linear-gradient(180deg, var(--eng-bg-2), var(--eng-bg-0)) !important;
  border-left: 1px solid var(--eng-line) !important; border-right: none !important;
  padding: 14px 13px !important;
}
.eng-rail .er-verdict{
  font: 700 13px/1.3 var(--font-head); text-align: center;
  padding: 9px 10px; border-radius: 8px; margin-bottom: 14px;
  border: 1px solid var(--eng-line);
}
.eng-rail .er-verdict.ok { color: var(--eng-ok);     background: rgba(66,211,146,.10);  border-color: rgba(66,211,146,.35); }
.eng-rail .er-verdict.bad{ color: var(--eng-danger); background: rgba(255,93,115,.10);  border-color: rgba(255,93,115,.35); }
.eng-rail .er-verdict.na { color: var(--eng-text-mute); }
.eng-rail .er-sec{
  font: 700 10px/1 var(--font-head); letter-spacing: .14em; text-transform: uppercase;
  color: var(--eng-primary); margin: 16px 0 9px; padding-bottom: 5px;
  border-bottom: 1px solid var(--eng-line);
}
.eng-rail .er-sec:first-of-type{ margin-top: 0; }
.eng-rail .er-gauges{ display: flex; gap: 8px; justify-content: space-around; }
.eng-rail .er-g{ display: flex; flex-direction: column; align-items: center; gap: 6px; flex: 1; }
.eng-rail .er-gl{ font: 600 11px/1.35 var(--font-head); color: var(--eng-text-2); text-align: center; }
.eng-rail .er-gl span{ display: block; margin-top: 2px; font: 500 9px/1.3 var(--font-mono); color: var(--eng-text-mute); word-break: break-word; }
/* ring gauge svg (exempt from the diagram svg box styling) */
.eng-rail svg, .ribbon svg, .statusbar svg{ background: transparent !important; border: none !important; border-radius: 0 !important; }
.eng-rail .er-ring .er-track{ fill: none; stroke: rgba(255,255,255,.08); stroke-width: 7; }
.eng-rail .er-ring .er-arc{ fill: none; stroke-width: 7; stroke-linecap: round; transition: stroke-dashoffset .5s ease; }
.eng-rail .er-ring.ok  .er-arc{ stroke: var(--eng-ok); }
.eng-rail .er-ring.warn .er-arc{ stroke: var(--eng-warn); }
.eng-rail .er-ring.bad .er-arc{ stroke: var(--eng-danger); }
.eng-rail .er-ring.na  .er-arc{ stroke: var(--eng-text-faint); }
.eng-rail .er-rv{ fill: var(--eng-text); font: 600 16px var(--font-mono); text-anchor: middle; }
.eng-rail .er-ring.bad .er-rv{ fill: var(--eng-danger); }
.eng-rail .er-ru{ fill: var(--eng-text-mute); font: 700 8px var(--font-head); letter-spacing: .12em; text-anchor: middle; }
.eng-rail .er-kv{
  display: flex; align-items: baseline; justify-content: space-between; gap: 10px;
  padding: 5px 0; border-bottom: 1px dashed rgba(0,229,195,.08);
  font: 500 12px var(--font-body); color: var(--eng-text-2);
}
.eng-rail .er-kv b{ font: 600 12.5px var(--font-mono); font-variant-numeric: tabular-nums; color: var(--eng-text); }

/* ---- Status bar ---------------------------------------------------------- */
.statusbar{
  display: flex; align-items: center; gap: 16px;
  height: 27px; padding: 0 16px; padding-right: 122px;  /* clear the floating theme FAB */
  background: linear-gradient(180deg, var(--eng-bg-3), var(--eng-bg-0)) !important;
  border-top: 1px solid var(--eng-line-2);
  font: 500 11px/1 var(--font-head); color: var(--eng-text-mute);
  white-space: nowrap; overflow: hidden;
}
.statusbar .sb-item{ display: inline-flex; align-items: center; gap: 6px; letter-spacing: .02em; }
.statusbar .sb-item b{ font-family: var(--font-mono); font-variant-numeric: tabular-nums; }
.statusbar .sb-item b.ok{ color: var(--eng-ok); }
.statusbar .sb-item b.bad{ color: var(--eng-danger); }
.statusbar .sb-grow{ flex: 1 1 auto; }
.statusbar .sb-sep{ width: 1px; height: 14px; background: var(--eng-line-2); }
.statusbar .sb-dot{ width: 8px; height: 8px; border-radius: 50%; background: var(--eng-text-faint); box-shadow: 0 0 6px currentColor; }
.statusbar .is-ok  { color: var(--eng-ok); }     .statusbar .is-ok  .sb-dot{ background: var(--eng-ok); }
.statusbar .is-bad { color: var(--eng-danger); } .statusbar .is-bad .sb-dot{ background: var(--eng-danger); }

/* collapse the rail on narrow viewports so nothing overflows */
@media (max-width: 1160px){
  main{ grid-template-columns: 288px minmax(0,1fr) !important; }
  .eng-rail{ display: none !important; }
}
@media (max-width: 820px){
  main{ grid-template-columns: 1fr !important; }
}

/* ============================================================================
 * 13. PERSISTENT 3D VIEWPORT (Phase 3) — center = live model always visible;
 *     workflow tabs + active data panel dock below it.
 * ========================================================================== */
main > section.main{
  display: flex !important; flex-direction: column !important;
  overflow: hidden !important; padding: 0 !important; background-image: none !important;
}
.viewport-3d{
  /* DEFINITE height (not flex-grow, not %) — a flex/% height here drives a
   * ResizeObserver↔layout thrash loop with the WebGL canvas. A fixed vh box
   * keeps #frame3d's size stable so the viewer's ResizeObserver settles. */
  flex: 0 0 auto !important; height: clamp(240px, 44vh, 520px) !important;
  position: relative;
  margin: 11px 13px 4px; border: 1px solid var(--eng-line-2); border-radius: 11px;
  overflow: hidden;
  background: radial-gradient(130% 120% at 50% -10%, #143049 0%, #0b1725 55%, #081019 100%);
  box-shadow: 0 10px 28px rgba(0,0,0,.5), inset 0 0 0 1px rgba(0,229,195,.06);
}
.viewport-3d #frame3d{ width: 100% !important; height: 100% !important; border: none !important; border-radius: 11px !important; }
.viewport-3d::before{
  content: "3D MODEL"; position: absolute; left: 11px; top: 9px; z-index: 4; pointer-events: none;
  font: 700 9.5px/1 var(--font-head); letter-spacing: .16em; color: var(--eng-primary);
  background: rgba(8,16,25,.55); padding: 5px 8px; border-radius: 6px;
  box-shadow: inset 0 0 0 1px var(--eng-line);
}
.viewport-3d .vp-caption{
  position: absolute; right: 11px; bottom: 9px; z-index: 4; pointer-events: none;
  font: 500 10.5px/1.4 var(--font-head); color: var(--eng-text-mute);
  background: rgba(8,16,25,.68); padding: 4px 9px; border-radius: 6px;
  box-shadow: inset 0 0 0 1px var(--eng-line); max-width: 70%;
}

/* the tab strip + active panel dock beneath the viewport */
main > section.main > .tabs{
  flex: 0 0 auto !important; margin: 6px 13px 0 !important;
  position: static !important; top: auto !important; padding-top: 6px !important;
  background: transparent !important;
}
main > section.main > .panel{ margin: 0 13px 12px !important; }
main > section.main > .panel.active{
  flex: 1 1 auto !important; min-height: 0 !important; overflow-y: auto !important;
}

/* dark-engineering restyle of the shared viewer toolbar (scoped to PEB) */
#frame3d.v3d-root{ background: transparent !important; }
#frame3d .v3d-toolbar{
  background: rgba(8,16,25,.82) !important; border-radius: 8px !important;
  box-shadow: inset 0 0 0 1px var(--eng-line), 0 4px 14px rgba(0,0,0,.4) !important;
  -webkit-backdrop-filter: blur(10px) !important; backdrop-filter: blur(10px) !important;
}
#frame3d .v3d-btn{
  font-family: var(--font-head) !important; font-weight: 600 !important; text-transform: none !important;
  letter-spacing: .02em !important; font-size: 11.5px !important; color: var(--eng-text-2) !important;
  background: rgba(16,28,40,.85) !important; clip-path: none !important; border-radius: 5px !important;
  box-shadow: inset 0 0 0 1px var(--eng-line) !important;
}
#frame3d .v3d-btn:hover{
  color: var(--eng-text) !important; background: rgba(28,46,64,.95) !important;
  box-shadow: inset 0 0 0 1px var(--eng-line-2), 0 0 10px rgba(0,229,195,.16) !important;
}
#frame3d .v3d-btn.active{
  color: #05131A !important; background: var(--eng-grad) !important;
  box-shadow: 0 0 10px rgba(0,229,195,.35) !important;
}
#frame3d .v3d-info{
  background: rgba(8,16,25,.72) !important; color: var(--eng-text-2) !important;
  font-family: var(--font-head) !important; box-shadow: inset 0 0 0 1px var(--eng-line) !important;
}