/* Fulcrum Sizing — calculator UI + dark/light theme system.
   Loads AFTER /assets/styles.css and extends its tokens. The light palette
   mirrors the QR Splitter desktop app's LIGHT_THEME (the reference for
   dark/light across all Fulcrum tools): BONE bg / INK text / ASH borders /
   LIME2 accent / ASH input fields with BONE text / INK primary buttons
   with LIME text. Dark stays the site default (INK/BONE/LIME). */

/* ── light theme: override the site's semantic tokens ── */
html[data-theme="light"] {
  --bg: var(--bone);
  --surface: #E9E5DC;            /* bone-shifted card surface (QR BONE2 kin) */
  --text: var(--ink);
  --text-dim: var(--ash);
  --accent: var(--lime2);        /* LIME2 for contrast on light (QR parity) */
  --border: #D5D1C8;             /* QR light pressed shade as hairline */
  --glow-soft: 0 0 24px rgba(155, 204, 47, 0.12);
  --glow-hard: 0 0 0 1px rgba(155, 204, 47, 0.40), 0 0 28px rgba(155, 204, 47, 0.16);
}
html[data-theme="light"] body { background: var(--bg); color: var(--text); }

/* Primary CTA flips per QR Splitter: INK button, LIME text. */
html[data-theme="light"] .btn-primary {
  background: var(--ink);
  color: var(--lime);
  border-color: var(--ink);
}
html[data-theme="light"] .btn-primary:hover {
  background: var(--ink2);
  color: var(--lime);
}
html[data-theme="light"] .btn-ghost { color: var(--ink); border-color: var(--ash); }
html[data-theme="light"] .btn-ghost:hover { border-color: var(--ink); }

/* Header / footer / menus follow the flip. */
html[data-theme="light"] .site-header { background: rgba(242, 239, 232, 0.92); border-bottom-color: var(--border); }
html[data-theme="light"] .site-nav a { color: var(--ink); }
html[data-theme="light"] .nav-menu { background: var(--bone); border-color: var(--border); }
html[data-theme="light"] .nav-menu a { color: var(--ink); }
html[data-theme="light"] .nav-toggle span { background: var(--ink); }
html[data-theme="light"] .mobile-menu { background: var(--bone); }
html[data-theme="light"] .mobile-menu a { color: var(--ink); }
html[data-theme="light"] .site-footer { background: var(--surface); border-top-color: var(--border); }
html[data-theme="light"] .site-footer a { color: var(--ink); }
/* The lockup asset is BONE type on transparent — keep it on an INK chip in
   light mode so the mark itself is never re-colored or redrawn. */
html[data-theme="light"] .lockup img { background: var(--ink); padding: 6px 10px; }

/* ── calculator shell ── */
.sz-wrap { max-width: var(--max-w); margin: 0 auto; padding: 0 var(--gutter); }

.sz-toolbar {
  display: flex; align-items: center; justify-content: space-between;
  gap: 12px; flex-wrap: wrap; margin: 8px 0 20px;
}
.sz-toolbar .eyebrow { margin: 0; }
.sz-toolbar__actions { display: flex; gap: 10px; }

.sz-btn {
  font-family: 'JetBrains Mono', monospace; font-size: 12px;
  letter-spacing: 0.08em; text-transform: uppercase;
  background: transparent; color: var(--text);
  border: 1px solid var(--border); padding: 8px 14px; cursor: pointer;
  transition: border-color 0.15s ease, color 0.15s ease, background 0.15s ease;
}
.sz-btn:hover { border-color: var(--accent); color: var(--accent); }
.sz-btn--primary {
  background: var(--lime); color: var(--ink); border-color: var(--lime);
  font-weight: 700;
}
.sz-btn--primary:hover { background: var(--lime2); border-color: var(--lime2); color: var(--ink); }
html[data-theme="light"] .sz-btn--primary { background: var(--ink); color: var(--lime); border-color: var(--ink); }
html[data-theme="light"] .sz-btn--primary:hover { background: var(--ink2); }

/* ── tabs ── */
.sz-tabs {
  display: flex; gap: 0; flex-wrap: wrap;
  border-bottom: 1px solid var(--border); margin-bottom: 24px;
}
.sz-tab {
  font-family: 'JetBrains Mono', monospace; font-size: 12px;
  letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--text-dim); background: none; border: none;
  border-bottom: 2px solid transparent; margin-bottom: -1px;
  padding: 12px 16px; cursor: pointer; transition: color 0.15s ease;
}
.sz-tab:hover { color: var(--text); }
.sz-tab[aria-selected="true"] { color: var(--accent); border-bottom-color: var(--accent); }

/* ── two-panel layout ── */
.sz-calc { display: grid; grid-template-columns: minmax(300px, 5fr) 7fr; gap: 32px; align-items: start; }
@media (max-width: 900px) { .sz-calc { grid-template-columns: 1fr; } }

.sz-panel {
  background: var(--surface); border: 1px solid var(--border); padding: 24px;
}
.sz-panel h3 {
  font-family: 'JetBrains Mono', monospace; font-size: 12px; font-weight: 700;
  letter-spacing: 0.12em; text-transform: uppercase; color: var(--text-dim);
  margin: 0 0 16px;
}
.sz-desc { font-size: 14px; color: var(--text-dim); margin: 0 0 18px; line-height: 1.5; }

/* ── form fields — QR Splitter's industrial-gray fields in BOTH themes:
     ASH background; INK text on dark, BONE text on light. ── */
.sz-form { display: grid; gap: 14px; }
.sz-field { display: grid; gap: 5px; }
.sz-field > label {
  font-family: 'JetBrains Mono', monospace; font-size: 11px;
  letter-spacing: 0.1em; text-transform: uppercase; color: var(--text-dim);
}
.sz-field .sz-unit { color: var(--accent); text-transform: none; letter-spacing: 0; }
.sz-input, .sz-select {
  font-family: 'Archivo', sans-serif; font-size: 15px;
  background: var(--ash); color: var(--ink);
  border: 1px solid var(--line); padding: 9px 10px; width: 100%;
  border-radius: 0; appearance: none; -webkit-appearance: none;
}
html[data-theme="light"] .sz-input, html[data-theme="light"] .sz-select {
  color: var(--bone); border-color: var(--ash);
}
.sz-input:focus, .sz-select:focus { outline: 2px solid var(--accent); outline-offset: 0; }
.sz-select { cursor: pointer; }
.sz-selectwrap { position: relative; }
.sz-selectwrap::after {
  content: "▾"; position: absolute; right: 10px; top: 50%;
  transform: translateY(-50%); color: var(--ink); pointer-events: none; font-size: 12px;
}
html[data-theme="light"] .sz-selectwrap::after { color: var(--bone); }
.sz-hint { font-size: 12px; color: var(--text-dim); line-height: 1.45; }

/* repeater rows (fixture counts, conductor sets) */
.sz-rows { display: grid; gap: 8px; }
.sz-row { display: grid; grid-template-columns: 1fr auto auto; gap: 8px; align-items: center; }
.sz-row--3 { grid-template-columns: 1.4fr 1fr 72px auto; }
.sz-row .sz-input--count { width: 72px; }
.sz-row-del {
  font-family: 'JetBrains Mono', monospace; background: none; cursor: pointer;
  color: var(--text-dim); border: 1px solid var(--border); padding: 7px 10px; font-size: 12px;
}
.sz-row-del:hover { color: #e2603d; border-color: #e2603d; }
.sz-add {
  justify-self: start; font-family: 'JetBrains Mono', monospace; font-size: 12px;
  letter-spacing: 0.08em; background: none; border: 1px dashed var(--border);
  color: var(--text-dim); padding: 8px 14px; cursor: pointer;
}
.sz-add:hover { color: var(--accent); border-color: var(--accent); }

/* ── results ── */
.sz-results { display: grid; gap: 20px; }
.sz-empty { color: var(--text-dim); font-size: 14px; padding: 8px 0; }

.sz-primary { border-left: 3px solid var(--accent); padding: 6px 0 6px 20px; }
.sz-primary__label {
  font-family: 'JetBrains Mono', monospace; font-size: 11px;
  letter-spacing: 0.12em; text-transform: uppercase; color: var(--text-dim);
}
.sz-primary__value {
  font-family: 'Anton', sans-serif; font-size: clamp(40px, 6vw, 64px);
  line-height: 0.95; letter-spacing: -0.01em; color: var(--text);
  text-transform: uppercase;
}
.sz-primary__value .sz-primary__unit {
  font-size: 0.38em; color: var(--accent); letter-spacing: 0.02em; margin-left: 8px;
}

.sz-outgrid { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 1px; background: var(--border); border: 1px solid var(--border); }
.sz-out { background: var(--surface); padding: 12px 14px; }
.sz-out__label {
  font-family: 'JetBrains Mono', monospace; font-size: 10px;
  letter-spacing: 0.1em; text-transform: uppercase; color: var(--text-dim);
  display: block; margin-bottom: 4px;
}
.sz-out__value { font-family: 'Archivo', sans-serif; font-weight: 700; font-size: 18px; color: var(--text); }
.sz-out__value small { font-weight: 400; font-size: 12px; color: var(--text-dim); margin-left: 3px; }

/* warnings */
.sz-warns { display: grid; gap: 8px; }
.sz-warn {
  font-size: 13px; line-height: 1.5; padding: 10px 14px;
  border-left: 3px solid var(--border); background: var(--surface); color: var(--text);
}
.sz-warn--info { border-left-color: var(--ash); }
.sz-warn--warn { border-left-color: var(--accent); background: rgba(198, 255, 61, 0.06); }
html[data-theme="light"] .sz-warn--warn { background: rgba(155, 204, 47, 0.10); }
.sz-warn--error { border-left-color: #e2603d; background: rgba(226, 96, 61, 0.07); }
.sz-warn__tag {
  font-family: 'JetBrains Mono', monospace; font-size: 10px; letter-spacing: 0.1em;
  text-transform: uppercase; margin-right: 8px; color: var(--text-dim);
}
.sz-warn--error .sz-warn__tag { color: #e2603d; }
.sz-warn--warn .sz-warn__tag { color: var(--accent); }

/* SHOW THE MATH */
.sz-math { border: 1px solid var(--border); }
.sz-math > summary {
  font-family: 'JetBrains Mono', monospace; font-size: 12px; font-weight: 700;
  letter-spacing: 0.12em; text-transform: uppercase; color: var(--text);
  padding: 12px 16px; cursor: pointer; list-style: none; user-select: none;
}
.sz-math > summary::before { content: "+ "; color: var(--accent); }
.sz-math[open] > summary::before { content: "− "; }
.sz-math > summary::-webkit-details-marker { display: none; }
.sz-steps { width: 100%; border-collapse: collapse; font-size: 13px; }
.sz-steps th {
  font-family: 'JetBrains Mono', monospace; font-size: 10px; letter-spacing: 0.1em;
  text-transform: uppercase; color: var(--text-dim); text-align: left;
  padding: 8px 16px; border-top: 1px solid var(--border);
}
.sz-steps td { padding: 8px 16px; border-top: 1px solid var(--border); vertical-align: top; }
.sz-steps .sz-steps__formula, .sz-steps .sz-steps__sub {
  font-family: 'JetBrains Mono', monospace; font-size: 12px; color: var(--text-dim);
  overflow-wrap: anywhere;
}
.sz-steps .sz-steps__value { font-weight: 700; color: var(--text); white-space: nowrap; }
.sz-mathscroll { overflow-x: auto; }

/* citations */
.sz-cites { display: grid; gap: 6px; }
.sz-cites__head {
  font-family: 'JetBrains Mono', monospace; font-size: 11px; font-weight: 700;
  letter-spacing: 0.12em; text-transform: uppercase; color: var(--text-dim);
}
.sz-cite {
  font-size: 13px; line-height: 1.5; color: var(--text);
  padding-left: 14px; border-left: 2px solid var(--accent);
}
.sz-cite b { font-family: 'JetBrains Mono', monospace; font-size: 12px; font-weight: 700; }
.sz-cite .sz-cite__note { color: var(--text-dim); font-size: 12px; }

/* disclaimer */
.sz-disclaimer {
  font-family: 'JetBrains Mono', monospace; font-size: 11px; line-height: 1.6;
  letter-spacing: 0.02em; color: var(--text-dim);
  border: 1px dashed var(--border); padding: 12px 16px;
}
.sz-disclaimer b { color: var(--text); }

/* error surface for ok:false */
.sz-fail { border-left: 3px solid #e2603d; background: rgba(226,96,61,0.07); padding: 12px 16px; font-size: 14px; }

/* ── feedback modal ── */
.sz-modal { position: fixed; inset: 0; z-index: 90; display: none; }
.sz-modal[data-open="true"] { display: block; }
.sz-modal__backdrop { position: absolute; inset: 0; background: rgba(15, 13, 10, 0.72); }
.sz-modal__card {
  position: relative; z-index: 1; max-width: 560px; margin: 6vh auto 0;
  max-height: 88vh; overflow-y: auto;
  background: var(--bg); border: 1px solid var(--border); padding: 28px;
  box-shadow: var(--glow-soft);
}
.sz-modal__card h2 {
  font-family: 'Anton', sans-serif; font-size: 26px; letter-spacing: -0.01em;
  text-transform: uppercase; margin: 0 0 6px; color: var(--text);
}
.sz-modal__kicker {
  font-family: 'JetBrains Mono', monospace; font-size: 11px; letter-spacing: 0.12em;
  text-transform: uppercase; color: var(--accent); display: block; margin-bottom: 10px;
}
.sz-modal__close {
  position: absolute; top: 14px; right: 14px; background: none; border: 1px solid var(--border);
  color: var(--text-dim); font-family: 'JetBrains Mono', monospace; font-size: 12px;
  padding: 6px 10px; cursor: pointer;
}
.sz-modal__close:hover { color: var(--text); border-color: var(--text-dim); }
.sz-modal .sz-form { margin-top: 16px; }
.sz-textarea {
  font-family: 'Archivo', sans-serif; font-size: 14px; min-height: 120px; resize: vertical;
  background: var(--ash); color: var(--ink); border: 1px solid var(--line);
  padding: 10px; width: 100%; border-radius: 0;
}
html[data-theme="light"] .sz-textarea { color: var(--bone); border-color: var(--ash); }
.sz-textarea:focus { outline: 2px solid var(--accent); }
.sz-attach {
  font-family: 'JetBrains Mono', monospace; font-size: 11px; color: var(--text-dim);
  border: 1px dashed var(--border); padding: 10px 12px; line-height: 1.5;
  overflow-wrap: anywhere; max-height: 130px; overflow-y: auto;
}
/* honeypot — visually gone, still in the DOM for bots */
.sz-hp { position: absolute; left: -9999px; top: -9999px; height: 1px; width: 1px; overflow: hidden; }

.sz-status { display: none; font-size: 14px; padding: 10px 14px; border-left: 3px solid var(--border); }
.sz-status[data-kind="ok"] { display: block; border-left-color: var(--lime); background: rgba(198,255,61,0.06); }
.sz-status[data-kind="err"] { display: block; border-left-color: #e2603d; background: rgba(226,96,61,0.07); }

/* ── page niceties ── */
.sz-hero-note { margin-top: 18px; }
.sz-methodology h3 { margin-top: 28px; }
@media print {
  .site-header, .site-footer, .sz-toolbar__actions, .sz-tabs, .mobile-menu { display: none !important; }
}