/* ===================================================================
   래더 화면 · 현장 설비 조작판 · PLC 모니터 패널
   =================================================================== */
:root {
  --ld-bg: #ffffff;
  --ld-fg: #16202e;
  --ld-line: #334155;
  --ld-rail: #1e293b;
  --ld-grid: #e2e8f0;
  --ld-on: #16a34a;          /* 통전 */
  --ld-dev: #1d4ed8;
  --ld-cmt: #64748b;
  --ld-note: #0f766e;
  --ld-box: #f8fafc;
  --ld-cursor: #2563eb;
}
:root[data-theme="dark"] {
  --ld-bg: #11161d;
  --ld-fg: #d9e2ef;
  --ld-line: #94a3b8;
  --ld-rail: #cbd5e1;
  --ld-grid: #263040;
  --ld-on: #4ade80;
  --ld-dev: #7cb0ff;
  --ld-cmt: #8595ab;
  --ld-note: #5eead4;
  --ld-box: #1a2029;
  --ld-cursor: #60a5fa;
}

/* ---------------------------------------------------------------- 래더 */
.lv { position: relative; width: 100%; height: 100%; background: var(--ld-bg); overflow: hidden; }
.lv-scroll { position: absolute; inset: 0; overflow: auto; }
.lv-svg { display: block; outline: none; font-family: var(--mono); }
/* 강좌 · 슬라이드의 래더: 가로 스크롤 없이 폭을 꽉 채운다 (세로는 스크롤) */
.lv.fit .lv-scroll { overflow-x: hidden; }
.lv.fit .lv-svg { width: 100%; height: auto; }
.lv-bg { fill: var(--ld-bg); }
.lv-rail { stroke: var(--ld-rail); stroke-width: 3; }
.lv-sep { stroke: var(--ld-grid); stroke-width: 1; }
.lv-w { stroke: var(--ld-line); stroke-width: 2; }
.lv-bar { stroke: var(--ld-line); stroke-width: 2.4; }
.lv-coil { stroke: var(--ld-line); stroke-width: 2.4; fill: none; }
.lv-box, .lv-cmp { fill: var(--ld-box); stroke: var(--ld-line); stroke-width: 1.8; }
.lv-hit { fill: transparent; }
.lv-v { stroke: var(--ld-line); stroke-width: 2; }
.lv-dev { fill: var(--ld-fg); font-size: 12.5px; font-weight: 700; }
.lv-inv { fill: var(--ld-cmt); font-size: 10.5px; font-weight: 700; }
.lv-inv.on { fill: var(--ld-on); }
.lv:not(.mon) .lv-inv { display: none; }
.lv-boxt, .lv-cmp-t { fill: var(--ld-fg); font-size: 12.5px; font-weight: 700; }
.lv-sym { fill: var(--ld-fg); font-size: 13px; font-weight: 800; }
.lv-cmt { fill: var(--ld-cmt); font-size: 10.5px; font-family: var(--sans); }
.lv-val { fill: var(--ld-dev); font-size: 11px; font-weight: 700; }
.lv-step { fill: var(--ld-cmt); font-size: 11px; }
.lv-note { fill: var(--ld-note); font-size: 12.5px; font-family: var(--sans); font-weight: 600; }
.lv-label { fill: var(--accent2); font-size: 12px; font-weight: 800; }
.lv-err { fill: var(--danger); font-size: 12px; font-family: var(--sans); font-weight: 700; }
.lv:not(.mon) .lv-val { display: none; }
.lv.mon .lv-cmt { display: none; }
/* 통전 표시 */
.lv.mon .lv-cell.on .lv-w, .lv.mon .lv-cell.on .lv-bar, .lv.mon .lv-cell.on .lv-coil { stroke: var(--ld-on); stroke-width: 3; }
.lv.mon .lv-v.on { stroke: var(--ld-on); stroke-width: 3; }
.lv.mon .lv-cell.on .lv-box, .lv.mon .lv-cell.on .lv-cmp { stroke: var(--ld-on); }
.lv.mon .lv-cell.dev-on .lv-bar { stroke: var(--ld-on); }
.lv.mon .lv-cell.dev-on .lv-hit { fill: color-mix(in srgb, var(--ld-on) 18%, transparent); }
.lv.mon .lv-cell.on.lv-out .lv-dev { fill: var(--ld-on); }
.lv-cursor { fill: color-mix(in srgb, var(--ld-cursor) 12%, transparent); stroke: var(--ld-cursor); stroke-width: 2; }
.lv.editing .lv-svg { cursor: cell; }
.lv-input { position: absolute; z-index: 30; display: flex; flex-direction: column; gap: 2px; }
.lv-input input { width: 220px; font: 700 13px var(--mono); padding: 5px 8px; border: 2px solid var(--ld-cursor); border-radius: 6px; background: var(--card); color: var(--fg); }
.lv-input .hint { font-size: 10.5px; color: var(--muted); background: var(--card); border-radius: 4px; padding: 0 4px; }
.lv-toast {
  position: absolute; left: 50%; bottom: 10px; transform: translateX(-50%) translateY(20px); z-index: 25;
  background: #111827; color: #e5e7eb; border-radius: 8px; padding: 6px 14px; font-size: 13px; font-weight: 600;
  opacity: 0; transition: opacity .15s, transform .15s; pointer-events: none; white-space: nowrap; max-width: 92%; overflow: hidden; text-overflow: ellipsis;
}
.lv-toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
.lv-toast.bad { background: #b91c1c; color: #fff; }

/* 래더 편집 도구 모음 */
.ld-tools { display: flex; flex-wrap: wrap; gap: 4px; align-items: center; padding: 5px 8px; border-bottom: 1px solid var(--line); background: var(--card2); }
.ld-tools .btn { font-size: 12px; padding: 3px 8px; }
.ld-tools .sep { width: 1px; height: 20px; background: var(--line); margin: 0 3px; }
.ld-tools .k { font: 700 10.5px var(--mono); color: var(--muted); }
.ld-tools .btn.on { background: var(--accent); border-color: var(--accent); color: #fff; }
.ld-tools .btn.dirty { background: var(--warn); border-color: var(--warn); color: #221800; font-weight: 700; }
.ld-tools .btn.dirty:hover { filter: brightness(1.08); }
.ld-tools .btn:disabled { opacity: .35; cursor: not-allowed; }
.ld-mode { font-size: 11.5px; font-weight: 700; padding: 3px 9px; border-radius: 99px; white-space: nowrap; }
.ld-mode.edit { background: var(--accent-soft); color: var(--accent); }
.ld-mode.mon { background: var(--card2); color: var(--muted); }
/* 편집 모드는 한눈에 보이게 */
.lv.editing { box-shadow: inset 0 0 0 2px var(--ld-cursor); }

/* ---------------------------------------------------------------- 현장 설비 조작판 */
.pv { display: flex; flex-wrap: wrap; gap: 8px; padding: 10px; background: var(--card2); align-content: flex-start; overflow: auto; }
.pv-dev {
  position: relative; display: flex; flex-direction: column; align-items: center; gap: 3px; min-width: 88px;
  background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 8px 10px 6px; box-shadow: var(--shadow);
}
.pv-dev.wide { min-width: 260px; flex: 1 1 320px; }
.pv-dev .nm { font-size: 11.5px; font-weight: 700; text-align: center; line-height: 1.25; }
.pv-dev .ad { font: 600 10px var(--mono); color: var(--muted); }
.pv-dev .ad.on { color: var(--ok); }
.pv-dev svg { display: block; }
.pv-dev.fault { border-color: var(--danger); box-shadow: 0 0 0 2px var(--danger-soft); }
.pv-dev .warn { position: absolute; top: -8px; right: -6px; font-size: 14px; }
.pv-btn { cursor: pointer; user-select: none; -webkit-user-select: none; touch-action: none; }
.pv-val { font: 700 12px var(--mono); color: var(--accent); }
.pv-dev input[type=range] { width: 110px; accent-color: var(--accent2); }
.pv-term { width: 100%; display: flex; flex-direction: column; gap: 4px; }
.pv-term pre { margin: 0; height: 84px; overflow: auto; background: #0f1419; color: #d7dde8; border-radius: 6px; padding: 5px 7px; font: 12px/1.45 var(--mono); white-space: pre-wrap; word-break: break-all; }
.pv-term .row { display: flex; gap: 4px; }
.pv-term input { flex: 1; min-width: 60px; font: 12.5px var(--mono); padding: 3px 6px; border: 1px solid var(--line); border-radius: 6px; background: var(--card2); color: var(--fg); }
.pv-empty { color: var(--muted); font-size: 13px; padding: 14px; }

/* ---------------------------------------------------------------- PLC 모니터 패널 (오른쪽) */
.mp { display: flex; flex-direction: column; height: 100%; min-height: 0; background: #0d1117; color: #d7dde8; }
.mp-head { display: flex; align-items: center; gap: 8px; padding: 8px 12px; background: #161b22; border-bottom: 1px solid #262c36; }
.mp-title { font-weight: 800; font-size: 13.5px; color: #e6edf3; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.mp-body { flex: 1; overflow-y: auto; padding: 10px; display: flex; flex-direction: column; gap: 10px; }
.mp-card { background: #151b23; border: 1px solid #262c36; border-radius: 10px; overflow: hidden; flex: none; }
.mp-card > h4 { display: flex; align-items: center; gap: 6px; margin: 0; font-size: 12.5px; font-weight: 800; color: #9fb0c8; padding: 6px 10px; border-bottom: 1px solid #262c36; background: #11161d; }
.mp-card > h4 .spacer { flex: 1; }
.mp-card .bd { padding: 8px 10px; display: flex; flex-direction: column; gap: 6px; font-size: 12.5px; }
.mp .btn { background: transparent; color: #c9d1d9; border-color: #30363d; }
.mp .btn:hover:not(:disabled) { border-color: #58a6ff; }
.mp .btn.on { border-color: #4ade80; color: #4ade80; }
.mp .btn.run { border-color: #16a34a; background: #16a34a; color: #fff; }
.mp .btn.stop { border-color: #b91c1c; background: #b91c1c; color: #fff; }
.mp select, .mp input { background: #0d1117; color: #e6edf3; border: 1px solid #30363d; border-radius: 6px; padding: 3px 6px; font: 12px var(--mono); }
.mp-run { display: flex; align-items: center; gap: 6px; padding: 8px 10px; background: #12171e; border-bottom: 1px solid #262c36; flex-wrap: wrap; }
.mp-leds { display: flex; gap: 8px; align-items: center; }
.led { display: inline-flex; align-items: center; gap: 3px; font: 700 10px var(--mono); color: #6b7587; }
.led i { width: 9px; height: 9px; border-radius: 50%; background: #2b323d; display: inline-block; }
.led.on { color: #e6edf3; }
.led.on.g i { background: #22c55e; box-shadow: 0 0 6px #22c55e; }
.led.on.r i { background: #ef4444; box-shadow: 0 0 6px #ef4444; }
.led.on.y i { background: #facc15; box-shadow: 0 0 6px #facc15; }
.mp-scan { font: 600 11.5px var(--mono); color: #7ee787; margin-left: auto; }
.mp-err { background: #3a1a18; color: #ffb4ae; border: 1px solid #7f1d1d; border-radius: 8px; padding: 6px 9px; font-size: 12px; }

/* 랙 그림 */
.rack { display: flex; gap: 2px; padding: 8px; background: #0b0f14; border-radius: 8px; overflow-x: auto; }
.rack .mod { min-width: 58px; background: #1f2937; border: 1px solid #374151; border-radius: 5px; padding: 4px 3px; cursor: pointer; display: flex; flex-direction: column; align-items: center; gap: 3px; }
.rack .mod:hover { border-color: #58a6ff; }
.rack .mod.sel { border-color: #f59e0b; }
.rack .mod .t { font: 700 9.5px var(--mono); color: #e6edf3; text-align: center; line-height: 1.2; word-break: break-all; }
.rack .mod .xy { font: 9px var(--mono); color: #7d8799; }
.rack .mod.cpu { background: #1e3a5f; min-width: 66px; }
.rack .mod.psu { background: #2a2118; min-width: 40px; }
.rack .pts { display: grid; grid-template-columns: repeat(4, 7px); gap: 2px; }
.rack .pts i { width: 7px; height: 7px; border-radius: 1px; background: #0d1117; border: 1px solid #30363d; }
.rack .pts i.on { background: #facc15; border-color: #facc15; box-shadow: 0 0 4px rgba(250, 204, 21, .8); }
.rack .pts i.y.on { background: #22c55e; border-color: #22c55e; box-shadow: 0 0 4px rgba(34, 197, 94, .8); }

/* 디바이스 모니터 */
table.dm { width: 100%; border-collapse: collapse; font: 12px var(--mono); }
table.dm th { color: #7d8799; font-weight: 600; text-align: left; font-size: 11px; padding: 2px 4px; }
table.dm td { padding: 2px 4px; border-top: 1px solid #1f2733; }
table.dm td.n { color: #e6edf3; font-weight: 700; }
table.dm td.v { text-align: right; color: #fde047; }
table.dm td.v.on { color: #4ade80; font-weight: 800; }
table.dm td.v.off { color: #6b7587; }
table.dm td.c { color: #7d8799; font-family: var(--sans); font-size: 11px; max-width: 110px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
table.dm td.a { width: 22px; text-align: center; }
table.dm button { background: transparent; border: none; color: #6b7587; cursor: pointer; padding: 0 2px; }
table.dm button:hover { color: #58a6ff; }
.dm-add { display: flex; gap: 4px; }
.dm-add input { flex: 1; min-width: 40px; }

/* 아날로그 채널 */
.ach { display: flex; align-items: center; gap: 6px; font: 12px var(--mono); }
.ach .nm { color: #e6edf3; min-width: 54px; }
.ach .bar { flex: 1; height: 8px; background: #0d1117; border: 1px solid #30363d; border-radius: 4px; overflow: hidden; }
.ach .bar i { display: block; height: 100%; background: linear-gradient(90deg, #2563eb, #22d3ee); }
.ach .bar i.da { background: linear-gradient(90deg, #f59e0b, #fbbf24); }
.ach .v { color: #fde047; min-width: 96px; text-align: right; }

/* 시리얼 터미널 (모니터) */
.serlog { height: 110px; overflow: auto; background: #0b0f14; border-radius: 6px; padding: 5px 7px; font: 11.5px/1.5 var(--mono); }
.serlog .tx { color: #7ee787; }
.serlog .rx { color: #79c0ff; }

/* 실제 PLC 연동 */
.plcbr { display: flex; flex-direction: column; gap: 6px; font-size: 12px; }
.plcbr .row { display: flex; gap: 4px; align-items: center; }
.plcbr .row label { color: #7d8799; min-width: 62px; }
.plcbr .row input { flex: 1; min-width: 40px; }
.plcbr .st { font-size: 11.5px; color: #7d8799; }
.plcbr .st.ok { color: #4ade80; }
.plcbr .st.bad { color: #ff7b72; }

/* ---------------------------------------------------------------- 문서 속 래더 카드 */
.plc-block { margin: 18px 0; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; background: var(--card); box-shadow: var(--shadow); }
.plc-block.active { border-color: #22c55e; box-shadow: 0 0 0 3px rgba(34, 197, 94, .15), var(--shadow); }
.pb-head { display: flex; align-items: center; gap: 6px; padding: 7px 10px 7px 14px; border-bottom: 1px solid var(--line); flex-wrap: wrap; }
.pb-head .t { flex: 1; min-width: 160px; font-weight: 700; font-size: 14px; }
.pb-head .t .tag { font: 600 11px var(--mono); color: #16a34a; background: color-mix(in srgb, #22c55e 14%, transparent); border-radius: 5px; padding: 1px 6px; margin-right: 6px; vertical-align: 1px; }
.pb-stage { position: relative; height: var(--pb-h, 260px); background: var(--ld-bg); border-bottom: 1px solid var(--line); }
.pb-io { max-height: 240px; }
.pb-desc { padding: 10px 16px; border-top: 1px solid var(--line); font-size: 14px; }
.pb-desc p:first-child { margin-top: 0; }
.pb-desc p:last-child { margin-bottom: 0; }
.pb-err { padding: 8px 14px; color: var(--danger); font-size: 13px; background: var(--danger-soft); white-space: pre-wrap; }
.pb-il { display: none; height: var(--pb-h, 260px); overflow: auto; margin: 0; padding: 10px 14px; background: var(--code-bg); font: 13px/1.55 var(--mono); }
.plc-block.il-mode .pb-stage { display: none; }
.plc-block.il-mode .pb-il { display: block; }
.pb-status { display: flex; align-items: center; gap: 8px; padding: 4px 12px; border-top: 1px dashed var(--line); background: var(--card2); font-size: 12px; color: var(--muted); }
.pb-status .led { color: var(--muted); }
.pb-status .led.on { color: var(--fg); }

/* 실습 채점 */
.grade { margin-top: 8px; border: 1px solid var(--line); border-radius: 8px; overflow: hidden; }
.grade .gh { padding: 5px 10px; font-size: 12.5px; font-weight: 700; background: var(--card2); }
.grade.pass .gh { background: var(--ok-soft); color: var(--ok); }
.grade.fail .gh { background: var(--danger-soft); color: var(--danger); }
.grade ul { margin: 0; padding: 6px 10px 8px 26px; font-size: 12.5px; }
.grade li.bad { color: var(--danger); }

/* 슬라이드 속 래더 */
.s-ladder { display: grid; grid-template-columns: 1fr; gap: 1.2cqw; height: 100%; min-height: 0; }
.s-ladder.has-side { grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr); }
.s-ladder .s-lv { position: relative; border: 1px solid var(--s-line); border-radius: .8cqw; overflow: hidden; background: var(--ld-bg); min-height: 0; }
.s-ladder .s-side { display: flex; flex-direction: column; gap: 1cqw; min-height: 0; overflow: hidden; }
.s-ladder .s-io { flex: 1; min-height: 0; border: 1px solid var(--s-line); border-radius: .8cqw; overflow: auto; }
.s-ladder .s-points { flex: none; }
.s-ladder .s-bar { position: absolute; right: .6cqw; top: .6cqw; z-index: 6; display: flex; gap: .4cqw; }
.s-ladder .s-bar button { font-size: 1.05cqw !important; padding: .2cqw .7cqw !important; }