/* ═══════════════════════════════════════════════════════════════════
   BLACK BOX ANALYZER
   Standalone assessment page. Does not use /style.css.
   Shares the paper look of aiii-teardowns.html: white sheets on a grey
   desk, one blue accent, mono for labels and Lexend for anything a
   student actually reads. Fields are ruled lines rather than boxes,
   which is what makes a long form read like a worksheet.
   ═══════════════════════════════════════════════════════════════════ */

/* ── FONTS ────────────────────────────────────────────────────────── */
@font-face { font-family:'Lexend'; src:url('../../../Fonts/Lexend%20Family/webfonts/Lexend-Regular.woff2') format('woff2');  font-weight:400; font-display:swap; }
@font-face { font-family:'Lexend'; src:url('../../../Fonts/Lexend%20Family/webfonts/Lexend-Medium.woff2') format('woff2');   font-weight:500; font-display:swap; }
@font-face { font-family:'Lexend'; src:url('../../../Fonts/Lexend%20Family/webfonts/Lexend-SemiBold.woff2') format('woff2'); font-weight:600; font-display:swap; }
@font-face { font-family:'Lexend'; src:url('../../../Fonts/Lexend%20Family/webfonts/Lexend-Bold.woff2') format('woff2');     font-weight:700; font-display:swap; }
@font-face { font-family:'JetBrains Mono'; src:url('../../../Fonts/Jetbrains/woff2/JetBrainsMono-Regular.woff2') format('woff2');   font-weight:400; font-display:swap; }
@font-face { font-family:'JetBrains Mono'; src:url('../../../Fonts/Jetbrains/woff2/JetBrainsMono-Medium.woff2') format('woff2');    font-weight:500; font-display:swap; }
@font-face { font-family:'JetBrains Mono'; src:url('../../../Fonts/Jetbrains/woff2/JetBrainsMono-Bold.woff2') format('woff2');      font-weight:700; font-display:swap; }
@font-face { font-family:'JetBrains Mono'; src:url('../../../Fonts/Jetbrains/woff2/JetBrainsMono-ExtraBold.woff2') format('woff2'); font-weight:800; font-display:swap; }

/* ── GROUND ───────────────────────────────────────────────────────── */
:root {
  --ink:       #14171c;
  --ink-soft:  #5b6472;
  --ink-dim:   #7b8492;
  --desk:      #eceef2;
  --page:      #ffffff;
  --fill:      #f7f8fa;
  --fill-2:    #eef1f5;
  --line:      #c8cdd6;
  --hair:      #e4e7ec;
  --accent:    #1a5cb8;
  --accent-bg: #f5f8fd;
  --ok:        #1f7a3d;
  --warn:      #b3261e;
  --radius:    10px;
  --shadow:    0 1px 3px rgba(20,23,28,0.07), 0 8px 26px rgba(20,23,28,0.07);

  --font-display: 'JetBrains Mono', ui-monospace, Menlo, Consolas, monospace;
  --font-body:    'Lexend', 'Helvetica Neue', Helvetica, Arial, sans-serif;
  --font-mono:    'JetBrains Mono', ui-monospace, Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--desk);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); }

.skip-link {
  position: absolute; left: -9999px; top: 0;
  background: var(--accent); color: #fff;
  padding: 0.6rem 1rem; font-weight: 600; z-index: 200;
}
.skip-link:focus { left: 0; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* ── HEADER ───────────────────────────────────────────────────────── */
.bb-head { background: var(--page); border-bottom: 1px solid var(--line); }
.bb-head-inner {
  max-width: 1080px; margin: 0 auto;
  padding: 2.4rem 1.5rem 2rem;
  display: flex; gap: 2.5rem; align-items: flex-end; justify-content: space-between;
  flex-wrap: wrap;
}
.bb-head-text { min-width: 0; max-width: 46rem; }
.bb-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.66rem; letter-spacing: 0.18em; text-transform: uppercase;
  color: var(--ink-dim); margin: 0 0 0.7rem;
}
.bb-head h1 {
  font-family: var(--font-display); font-weight: 800;
  font-size: clamp(1.4rem, 3.4vw, 2.3rem);
  line-height: 1.15; letter-spacing: -0.01em; margin: 0;
}
.bb-head-sub { margin: 0.7rem 0 0; color: var(--ink-soft); font-size: 0.92rem; max-width: 52ch; }

.bb-unit-link {
  display: block; text-decoration: none;
  padding: 0.7rem 1rem;
  border: 1px solid var(--line); border-radius: var(--radius);
  background: var(--page);
  transition: border-color 0.15s, color 0.15s;
}
.bb-unit-link:hover { border-color: var(--accent); }
.bb-unit-link-kicker {
  display: block; font-family: var(--font-mono);
  font-size: 0.58rem; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--ink-dim); margin-bottom: 0.15rem;
}
.bb-unit-link-title {
  display: block; font-family: var(--font-display); font-weight: 700;
  font-size: 0.9rem; color: var(--ink);
}

/* ── TAB BAR ──────────────────────────────────────────────────────── */
.bb-nav {
  position: sticky; top: 0; z-index: 60;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.bb-nav-inner {
  max-width: 1080px; margin: 0 auto; padding: 0.7rem 1.5rem;
  display: flex; gap: 1rem; align-items: center; justify-content: space-between;
  flex-wrap: wrap;
}
.bb-tabs { display: flex; gap: 0.35rem; flex-wrap: wrap; }
.bb-tab {
  font-family: var(--font-mono); font-size: 0.68rem; font-weight: 700;
  letter-spacing: 0.08em; text-transform: uppercase;
  padding: 0.5rem 0.75rem; border-radius: 7px; cursor: pointer;
  background: var(--page); border: 1px solid var(--line); color: var(--ink-soft);
  display: flex; align-items: center; gap: 0.45rem;
  transition: border-color 0.15s, color 0.15s;
}
.bb-tab:hover { border-color: var(--accent); color: var(--accent); }
.bb-tab[aria-selected="true"] { background: var(--accent); border-color: var(--accent); color: #fff; }
.bb-tab-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--line); flex: none; }
.bb-tab-dot.is-part { background: var(--accent); }
.bb-tab-dot.is-done { background: var(--ok); }
.bb-tab[aria-selected="true"] .bb-tab-dot { background: #fff; }

.bb-nav-actions { display: flex; gap: 0.35rem; flex-wrap: wrap; }

.bb-btn {
  font-family: var(--font-mono); font-size: 0.66rem; font-weight: 700;
  letter-spacing: 0.08em; text-transform: uppercase;
  padding: 0.5rem 0.85rem; border-radius: 7px; cursor: pointer;
  background: var(--page); border: 1px solid var(--line); color: var(--ink);
  transition: border-color 0.15s, color 0.15s;
}
.bb-btn:hover { border-color: var(--accent); color: var(--accent); }
.bb-btn-go { background: var(--accent); border-color: var(--accent); color: #fff; }
.bb-btn-go:hover { color: #fff; filter: brightness(1.1); }
.bb-btn-warn { border-color: var(--line); color: var(--warn); }
.bb-btn-warn:hover { border-color: var(--warn); color: var(--warn); }
.bb-btn[disabled] { opacity: 0.5; cursor: default; }

/* ── STAGE ────────────────────────────────────────────────────────── */
.bb-stage { max-width: 1080px; margin: 0 auto; padding: 2rem 1.5rem 4rem; }

.bb-slot { display: flex; gap: 0.9rem; align-items: baseline; flex-wrap: wrap; margin: 0 0 0.3rem; }
.bb-slot-num {
  font-family: var(--font-display); font-weight: 800; font-size: 1.9rem;
  color: var(--accent); line-height: 1;
}
.bb-slot-brief { font-family: var(--font-display); font-weight: 700; font-size: 1.1rem; margin: 0; }
.bb-slot-why { color: var(--ink-soft); font-size: 0.9rem; margin: 0 0 1.4rem; max-width: 66ch; }

/* progress */
.bb-meter { display: flex; align-items: center; gap: 0.7rem; margin: 0 0 1.6rem; }
.bb-meter-track { flex: 1; height: 5px; border-radius: 3px; background: var(--hair); overflow: hidden; max-width: 340px; }
.bb-meter-fill { height: 100%; background: var(--accent); transition: width 0.25s; }
.bb-meter-text { font-family: var(--font-mono); font-size: 0.68rem; color: var(--ink-dim); letter-spacing: 0.04em; }

/* ── FIELD BLOCKS ─────────────────────────────────────────────────── */
/* One white sheet per block, the same object the G9 pages use. */
.bb-block {
  background: var(--page); border: 1px solid var(--hair);
  border-radius: var(--radius); box-shadow: var(--shadow);
  padding: 1.3rem 1.5rem 1.5rem; margin: 0 0 1.1rem;
}
.bb-block-head {
  display: flex; gap: 0.7rem; align-items: baseline; margin: 0 0 0.5rem;
  padding-bottom: 0.4rem; border-bottom: 1px solid var(--hair);
}
.bb-block-n {
  font-family: var(--font-mono); font-size: 0.7rem; font-weight: 700;
  letter-spacing: 0.1em; color: var(--ink-dim); flex: none;
}
.bb-block-title {
  font-family: var(--font-mono); font-weight: 700; font-size: 0.76rem;
  letter-spacing: 0.13em; text-transform: uppercase; color: var(--accent);
  margin: 0;
}
.bb-block-hint { color: var(--ink-soft); font-size: 0.85rem; margin: 0.7rem 0 1rem; max-width: 72ch; }

.bb-fields { display: grid; gap: 1.1rem; }
.bb-fields.is-two { grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }

.bb-field { display: flex; flex-direction: column; gap: 0.35rem; min-width: 0; }
.bb-label {
  font-family: var(--font-mono); font-size: 0.63rem; font-weight: 700;
  letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink-dim);
}

/* A ruled line, not a box. This is the change that makes a page of
   twenty fields readable. */
.bb-input, .bb-select {
  font-family: var(--font-body); font-size: 0.95rem; color: var(--ink);
  background: transparent; border: none; border-bottom: 1px solid var(--line);
  border-radius: 0; padding: 0.3rem 0.15rem 0.35rem; width: 100%;
}
/* Several lines of writing still needs an edge to sit inside. */
.bb-area {
  font-family: var(--font-body); font-size: 0.95rem; color: var(--ink);
  background: var(--page); border: 1px solid var(--line);
  border-radius: 7px; padding: 0.5rem 0.65rem; width: 100%;
  resize: vertical; min-height: 4.4rem; line-height: 1.55;
}
.bb-input:focus, .bb-select:focus {
  outline: none; border-bottom-color: var(--accent); background: var(--accent-bg);
}
.bb-area:focus { outline: none; border-color: var(--accent); background: var(--accent-bg); }
.bb-input::placeholder, .bb-area::placeholder { color: var(--ink-dim); }
.bb-select { appearance: none; cursor: pointer; }
.bb-select option { background: var(--page); color: var(--ink); }

/* ── PART CHIPS ───────────────────────────────────────────────────── */
.bb-parts { display: flex; flex-wrap: wrap; gap: 0.45rem; margin: 0.3rem 0 0; align-items: center; }
.bb-chip {
  display: inline-flex; align-items: center; gap: 0.45rem;
  background: var(--fill); border: 1px solid var(--line);
  border-radius: 999px; padding: 0.28rem 0.35rem 0.28rem 0.7rem;
  font-size: 0.82rem;
}
.bb-chip-name { font-weight: 500; }
.bb-chip-cat { width: 8px; height: 8px; border-radius: 2px; flex: none; margin-right: -0.15rem; }
.bb-chip-btn {
  border: none; background: transparent; cursor: pointer; color: var(--ink-dim);
  font-family: var(--font-mono); font-size: 0.6rem; font-weight: 700;
  letter-spacing: 0.06em; text-transform: uppercase;
  padding: 0.15rem 0.4rem; border-radius: 999px;
}
.bb-chip-btn:hover { background: var(--fill-2); color: var(--accent); }
.bb-chip-btn.is-x { font-size: 0.9rem; line-height: 1; padding: 0.05rem 0.4rem 0.2rem; }
.bb-chip-add {
  border: 1px dashed var(--line); background: transparent; color: var(--accent);
  border-radius: 999px; padding: 0.3rem 0.85rem; cursor: pointer;
  font-family: var(--font-mono); font-size: 0.66rem; font-weight: 700;
  letter-spacing: 0.06em; text-transform: uppercase;
}
.bb-chip-add:hover { border-color: var(--accent); background: var(--accent-bg); }

.bb-ruled { margin: 1rem 0 0; display: grid; gap: 0.5rem; }
.bb-ruled-row {
  display: flex; gap: 0.6rem; align-items: center; flex-wrap: wrap;
  background: var(--fill); border: 1px solid var(--hair);
  border-radius: 7px; padding: 0.45rem 0.7rem;
}
.bb-ruled-name { font-size: 0.85rem; font-weight: 600; min-width: 8rem; }
.bb-ruled-row .bb-input { flex: 1; min-width: 12rem; width: auto; font-size: 0.88rem; }

/* ── CONTROLS LIST ────────────────────────────────────────────────── */
.bb-rows { display: grid; gap: 0.6rem; margin: 0 0 0.8rem; }
.bb-row {
  display: grid; gap: 0.7rem; align-items: center;
  grid-template-columns: minmax(8rem, 1fr) 9rem minmax(10rem, 1.6fr) auto;
}
@media (max-width: 720px) { .bb-row { grid-template-columns: 1fr; } }

/* ── BLOCK DIAGRAM ────────────────────────────────────────────────── */
.bb-diagram {
  background: var(--page); border: 1px solid var(--hair);
  border-radius: 8px; padding: 1rem; overflow-x: auto;
}
.bb-diagram svg { display: block; width: 100%; height: auto; min-width: 560px; }
.bb-diagram-empty { color: var(--ink-dim); font-size: 0.86rem; margin: 0; text-align: center; padding: 1.6rem 0; }

/* ── NOTES ────────────────────────────────────────────────────────── */
.bb-note {
  border-left: 3px solid var(--accent); background: var(--accent-bg);
  border-radius: 0 7px 7px 0; padding: 0.8rem 1rem; margin: 1.1rem 0 0;
  font-size: 0.87rem; color: var(--ink-soft);
}
.bb-note strong { color: var(--ink); }

/* ── PHOTO ────────────────────────────────────────────────────────── */
.bb-photo { margin: 0.4rem 0 0; }
.bb-photo-drop {
  display: block; width: 100%; text-align: left; cursor: pointer;
  background: var(--fill); border: 1px dashed var(--line);
  border-radius: 8px; padding: 1rem 1.1rem; color: var(--ink);
  font-family: var(--font-body);
  transition: border-color 0.15s, background 0.15s;
}
.bb-photo-drop:hover { border-color: var(--accent); background: var(--accent-bg); }
.bb-photo-drop-t {
  display: block; font-family: var(--font-display); font-weight: 700;
  font-size: 0.9rem; color: var(--accent); margin-bottom: 0.2rem;
}
.bb-photo-drop-s { display: block; color: var(--ink-soft); font-size: 0.84rem; line-height: 1.5; }

.bb-photo-has {
  display: grid; gap: 1rem; align-items: start;
  grid-template-columns: minmax(0, 280px) minmax(0, 1fr);
}
@media (max-width: 720px) { .bb-photo-has { grid-template-columns: 1fr; } }
.bb-photo-img {
  display: block; width: 100%; height: auto; max-height: 260px;
  object-fit: cover; border-radius: 8px; border: 1px solid var(--line);
  background: var(--fill);
}
.bb-photo-side { display: flex; flex-direction: column; gap: 0.7rem; align-items: flex-start; }
.bb-photo-side .bb-field { width: 100%; }

/* ── DOWNLOAD ROW ─────────────────────────────────────────────────── */
.bb-download { display: flex; gap: 0.7rem; align-items: flex-end; flex-wrap: wrap; }
.bb-download .bb-field { flex: 1; min-width: 15rem; }
.bb-download-ext {
  font-family: var(--font-mono); font-size: 0.85rem; color: var(--ink-dim);
  padding-bottom: 0.45rem;
}

/* ── SUMMARY ──────────────────────────────────────────────────────── */
.bb-table-wrap { overflow-x: auto; border: 1px solid var(--hair); border-radius: 8px; }
.bb-table { border-collapse: collapse; width: 100%; min-width: 720px; font-size: 0.86rem; }
.bb-table th, .bb-table td {
  text-align: left; padding: 0.6rem 0.8rem;
  border-bottom: 1px solid var(--hair); vertical-align: top;
}
.bb-table thead th {
  font-family: var(--font-mono); font-size: 0.62rem; font-weight: 700;
  letter-spacing: 0.09em; text-transform: uppercase; color: var(--ink-dim);
  background: var(--fill); border-bottom: 1.5px solid var(--line);
}
.bb-table tbody th {
  font-size: 0.84rem; font-weight: 600; color: var(--ink);
  background: var(--fill); border-right: 1.5px solid var(--line); white-space: nowrap;
}
.bb-table tbody tr:last-child td, .bb-table tbody tr:last-child th { border-bottom: none; }
.bb-table td.is-blank { color: var(--ink-dim); font-style: italic; }

.bb-imp { display: grid; gap: 0.7rem; }
.bb-imp-row {
  display: grid; gap: 0.6rem; align-items: center;
  grid-template-columns: 5.5rem 1fr 8.5rem 1fr;
}
@media (max-width: 860px) { .bb-imp-row { grid-template-columns: 1fr; } }
.bb-imp-word {
  font-family: var(--font-mono); font-size: 0.68rem; font-weight: 700;
  letter-spacing: 0.06em; text-transform: uppercase; color: var(--accent);
}

/* ── PICKER MODAL ─────────────────────────────────────────────────── */
.bb-modal { position: fixed; inset: 0; z-index: 200; display: flex; align-items: center; justify-content: center; padding: 1.2rem; }
.bb-modal[hidden] { display: none; }
.bb-modal-backdrop { position: absolute; inset: 0; background: rgba(20,23,28,0.42); }
.bb-modal-box {
  position: relative; background: var(--page); border: 1px solid var(--line);
  border-radius: var(--radius); width: min(620px, 100%);
  max-height: min(78vh, 720px); display: flex; flex-direction: column;
  padding: 1.2rem 1.3rem; box-shadow: 0 18px 50px rgba(20,23,28,0.24);
}
.bb-modal-top { display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.bb-modal-title { font-family: var(--font-display); font-weight: 700; font-size: 1rem; margin: 0; }
.bb-modal-sub { color: var(--ink-soft); font-size: 0.85rem; margin: 0.2rem 0 0.9rem; }
.bb-modal-close { background: transparent; border: none; color: var(--ink-soft); cursor: pointer; padding: 0.2rem; }
.bb-modal-close svg { width: 20px; height: 20px; }
.bb-modal-close:hover { color: var(--accent); }
.bb-modal-box .bb-input {
  border: 1px solid var(--line); border-radius: 7px; padding: 0.5rem 0.7rem;
}
.bb-modal-box .bb-input:focus { border-color: var(--accent); }
.bb-picker-list { overflow-y: auto; margin: 0.8rem -0.3rem 0; padding: 0 0.3rem; display: grid; gap: 0.4rem; }
.bb-pick {
  text-align: left; width: 100%; cursor: pointer;
  background: var(--page); border: 1px solid var(--hair); border-radius: 7px;
  padding: 0.6rem 0.8rem; color: var(--ink); font-family: var(--font-body);
  display: grid; grid-template-columns: 10px 1fr; gap: 0.7rem; align-items: start;
}
.bb-pick:hover { border-color: var(--accent); background: var(--accent-bg); }
.bb-pick[disabled] { opacity: 0.45; cursor: default; }
.bb-pick[disabled]:hover { border-color: var(--hair); background: var(--page); }
.bb-pick-swatch { width: 10px; height: 10px; border-radius: 2px; margin-top: 0.4rem; }
.bb-pick-name { display: block; font-weight: 600; font-size: 0.9rem; }
.bb-pick-blurb { display: block; color: var(--ink-soft); font-size: 0.8rem; line-height: 1.45; }
.bb-pick-empty { color: var(--ink-dim); font-size: 0.86rem; padding: 1rem 0; text-align: center; }

/* ── FOOTER ───────────────────────────────────────────────────────── */
.bb-foot {
  border-top: 1px solid var(--line); background: var(--page);
  padding: 1.8rem 1.5rem 2.6rem; text-align: center;
  color: var(--ink-soft); font-size: 0.85rem;
}
.bb-foot p { margin: 0 0 0.7rem; }
.bb-savestate { font-family: var(--font-mono); font-size: 0.68rem; letter-spacing: 0.04em; color: var(--ink-dim); }

/* ═══ PRINT ═══════════════════════════════════════════════════════════
   Screen builds it, paper hands it in. The print sheet is written into
   #printOut only when the student prints, and everything else hides.
   ═══════════════════════════════════════════════════════════════════ */
#printOut { display: none; }

@media print {
  @page { size: A4; margin: 13mm; }
  body {
    background: #fff !important; color: #16181c;
    font-size: 10.5pt; line-height: 1.45;
  }
  .bb-head, .bb-nav, .bb-foot, .bb-modal, .skip-link, main { display: none !important; }
  #printOut { display: block !important; }

  .pr-card { page-break-after: always; break-after: page; }
  .pr-card:last-child { page-break-after: auto; break-after: auto; }
  .pr-head { border-bottom: 2px solid #16181c; padding-bottom: 4mm; margin-bottom: 5mm; }
  .pr-kicker {
    font-family: var(--font-mono); font-size: 7.5pt; font-weight: 700;
    letter-spacing: 0.16em; text-transform: uppercase; color: #5c636e; margin: 0 0 1mm;
    display: flex; justify-content: space-between;
  }
  .pr-title { font-family: var(--font-display); font-weight: 800; font-size: 17pt; margin: 0; }
  .pr-sub { font-size: 9pt; color: #5c636e; margin: 1mm 0 0; }

  .pr-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 4mm 6mm; }
  .pr-b { break-inside: avoid; }
  .pr-b.is-wide { grid-column: 1 / -1; }
  .pr-l {
    font-family: var(--font-mono); font-size: 7pt; font-weight: 700;
    letter-spacing: 0.12em; text-transform: uppercase; color: #5c636e;
    margin: 0 0 1mm; border-bottom: 1px solid #c9cfd7; padding-bottom: 0.8mm;
  }
  .pr-t { margin: 0; white-space: pre-wrap; }
  .pr-t.is-blank { color: #9aa2ad; font-style: italic; }
  .pr-parts { margin: 0; padding: 0; list-style: none; font-size: 9.5pt; }
  .pr-parts li { margin: 0 0 0.6mm; }
  .pr-parts li b { font-weight: 600; }
  .pr-dia { width: 100%; height: auto; margin: 1mm 0 0; }
  .pr-photo { width: 100%; height: 46mm; object-fit: cover; border: 1px solid #c9cfd7; display: block; }
  .pr-cap { margin: 1mm 0 0; font-size: 8pt; color: #5c636e; }
  .pr-dia text { fill: #16181c; }
  .pr-table { border-collapse: collapse; width: 100%; font-size: 8.5pt; }
  .pr-table th, .pr-table td { border: 1px solid #c9cfd7; padding: 1.6mm 2mm; text-align: left; vertical-align: top; }
  .pr-table th { background: #eef1f5; font-family: var(--font-mono); font-size: 7pt; letter-spacing: 0.08em; text-transform: uppercase; }
  .pr-imp { margin: 0; padding-left: 5mm; }
  .pr-imp li { margin: 0 0 2mm; }
  .pr-foot { margin-top: 5mm; border-top: 1px solid #c9cfd7; padding-top: 2mm; font-family: var(--font-mono); font-size: 7pt; letter-spacing: 0.1em; text-transform: uppercase; color: #5c636e; display: flex; justify-content: space-between; }
}