/* ═══════════════════════════════════════════════════════════════════
   AI PROFESSIONAL ELECTRICAL WIRING DESIGNER — STYLES
   IEC 60364 Compliant · Dark Industrial Theme · Modernized UI
   ═══════════════════════════════════════════════════════════════════ */

/* ── DESIGN TOKENS ── */
:root {
  /* Backgrounds — deep navy scale */
  --bg0: #060b14;
  --bg1: #0a1120;
  --bg2: #0f1a2e;
  --bg3: #152138;
  --bg4: #1c2d45;

  /* Accent — electric cyan */
  --el: #00d4ff;
  --el2: #0099cc;
  --el3: #006699;

  /* Warning — amber */
  --am: #ffb300;
  --am2: #ff8c00;

  /* Success — green */
  --gr: #00ff88;
  --gr2: #00cc66;

  /* Danger — red */
  --rd: #ff3b3b;
  --rd2: #cc2222;

  /* Purple accent */
  --pu: #a855f7;

  /* Text hierarchy */
  --tx0: #e8f4ff;
  --tx1: #9ab4d4;
  --tx2: #5a7899;

  /* Borders & glass */
  --br: #1a3a5c;
  --br2: #00d4ff22;
  --glass: rgba(10, 17, 32, 0.7);

  /* Radii */
  --r: 10px;
  --r2: 6px;

  /* Shadows */
  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.35), 0 1px 3px rgba(0, 212, 255, 0.04);
  --shadow-card-hover: 0 8px 32px rgba(0, 0, 0, 0.45), 0 2px 8px rgba(0, 212, 255, 0.08);
  --shadow-btn: 0 2px 12px rgba(0, 0, 0, 0.25);

  /* Transitions */
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
}

/* ── RESET ── */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  overflow-x: hidden;
  scroll-behavior: smooth;
}

body {
  font-family: 'Rajdhani', sans-serif;
  background: var(--bg0);
  color: var(--tx0);
  min-height: 100vh;
  overflow-x: hidden;
  word-break: break-word;
  line-height: 1.5;
}

/* Subtle grid overlay */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background:
    repeating-linear-gradient(0deg, transparent, transparent 39px, #00d4ff05 39px, #00d4ff05 40px),
    repeating-linear-gradient(90deg, transparent, transparent 39px, #00d4ff05 39px, #00d4ff05 40px);
  pointer-events: none;
  z-index: 0;
}

/* ── HEADER — glassmorphism with animated border ── */
#hdr {
  position: relative;
  z-index: 10;
  background: linear-gradient(135deg, rgba(10, 22, 40, 0.92), rgba(15, 32, 64, 0.92));
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--el3);
  padding: 0 24px;
  display: flex;
  align-items: center;
  gap: 16px;
  min-height: 72px;
  flex-wrap: wrap;
  box-shadow: 0 4px 48px rgba(0, 212, 255, 0.1), inset 0 -1px 0 rgba(0, 212, 255, 0.1);
}

/* Animated top accent line */
#hdr::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--el), var(--am), var(--el), transparent);
  background-size: 200% 100%;
  animation: headerGlow 4s ease infinite;
}

@keyframes headerGlow {

  0%,
  100% {
    background-position: 0% center;
  }

  50% {
    background-position: 100% center;
  }
}

#hdr .logo {
  display: flex;
  align-items: center;
  gap: 14px;
  min-width: 0;
  flex: 1;
}

#hdr .logo svg {
  width: 40px;
  height: 40px;
  flex-shrink: 0;
  filter: drop-shadow(0 0 10px var(--el));
  transition: filter 0.3s var(--ease);
}

#hdr .logo svg:hover {
  filter: drop-shadow(0 0 18px var(--el));
}

#hdr h1 {
  font-family: 'Orbitron', monospace;
  font-size: clamp(0.65rem, 2.5vw, 1.05rem);
  font-weight: 700;
  color: var(--el);
  text-shadow: 0 0 24px rgba(0, 212, 255, 0.4);
  letter-spacing: 1px;
  line-height: 1.4;
  min-width: 0;
  overflow: hidden;
}

#hdr h1 span {
  display: block;
  font-size: clamp(0.48rem, 1.4vw, 0.62rem);
  color: var(--tx1);
  font-weight: 400;
  letter-spacing: 2.5px;
  margin-top: 3px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  opacity: 0.8;
}

#hdr .badge {
  display: flex;
  gap: 8px;
  flex-shrink: 0;
}

#hdr .badge span {
  padding: 4px 10px;
  border-radius: 20px;
  font-family: 'Share Tech Mono', monospace;
  font-size: 0.6rem;
  border: 1px solid;
  animation: pulse 2s infinite;
  white-space: nowrap;
  letter-spacing: 0.5px;
}

.b-iec {
  border-color: var(--el);
  color: var(--el);
  background: rgba(0, 212, 255, 0.08);
}

.b-230 {
  border-color: var(--am);
  color: var(--am);
  background: rgba(255, 179, 0, 0.08);
}

@keyframes pulse {

  0%,
  100% {
    opacity: 1;
  }

  50% {
    opacity: 0.55;
  }
}

/* ── STEP NAVIGATION ── */
#stepnav {
  position: relative;
  z-index: 9;
  background: var(--bg1);
  border-bottom: 1px solid var(--br);
  padding: 0 12px;
  display: flex;
  align-items: stretch;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

#stepnav::-webkit-scrollbar {
  display: none;
}

.step-btn {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 18px;
  background: none;
  border: none;
  color: var(--tx2);
  font-family: 'Rajdhani', sans-serif;
  font-size: 0.84rem;
  font-weight: 600;
  cursor: pointer;
  letter-spacing: 0.5px;
  border-bottom: 3px solid transparent;
  transition: all 0.25s var(--ease);
  white-space: nowrap;
  flex-shrink: 0;
  touch-action: manipulation;
}

.step-btn:hover {
  color: var(--tx1);
  background: rgba(0, 212, 255, 0.03);
}

.step-btn:focus-visible {
  outline: 2px solid var(--el);
  outline-offset: -2px;
}

.step-btn .sn {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Share Tech Mono', monospace;
  font-size: 0.65rem;
  border: 1.5px solid currentColor;
  flex-shrink: 0;
  transition: all 0.25s var(--ease);
}

.step-btn.active {
  color: var(--el);
  border-bottom-color: var(--el);
}

.step-btn.active .sn {
  background: var(--el);
  color: #000;
  border-color: var(--el);
  box-shadow: 0 0 14px rgba(0, 212, 255, 0.5);
}

.step-btn.done {
  color: var(--gr);
}

.step-btn.done .sn {
  background: var(--gr);
  color: #000;
  border-color: var(--gr);
}

.step-sep {
  color: var(--tx2);
  font-size: 0.8rem;
  opacity: 0.35;
  align-self: center;
  flex-shrink: 0;
}

/* ── MAIN CONTAINER ── */
#main {
  position: relative;
  z-index: 1;
  padding: 24px 20px;
  max-width: 1400px;
  margin: 0 auto;
  min-width: 0;
}

.step-page {
  display: none;
}

.step-page.active {
  display: block;
  animation: fadeIn 0.35s var(--ease);
}

/* ── SECTION CARD — elevated with subtle glow ── */
.sc {
  background: var(--bg2);
  border: 1px solid var(--br);
  border-radius: var(--r);
  margin-bottom: 20px;
  overflow: hidden;
  box-shadow: var(--shadow-card);
  transition: box-shadow 0.3s var(--ease), transform 0.3s var(--ease);
}

.sc:hover {
  box-shadow: var(--shadow-card-hover);
}

.sc-hdr {
  background: linear-gradient(90deg, var(--bg3), var(--bg2));
  padding: 14px 20px;
  display: flex;
  align-items: center;
  gap: 12px;
  border-bottom: 1px solid var(--br);
  flex-wrap: wrap;
  min-width: 0;
}

.sc-hdr h2 {
  font-family: 'Orbitron', monospace;
  font-size: clamp(0.64rem, 2vw, 0.88rem);
  color: var(--el);
  letter-spacing: 0.8px;
  min-width: 0;
  flex: 1;
}

.sc-hdr .ic {
  width: 34px;
  height: 34px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--el3), rgba(0, 102, 153, 0.5));
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 1rem;
  box-shadow: 0 2px 8px rgba(0, 212, 255, 0.15);
}

.sc-body {
  padding: 20px;
}

/* ── FORM GRID ── */
.fg {
  display: grid;
  gap: 14px;
}

.fg-2 {
  grid-template-columns: repeat(2, 1fr);
}

.fg-3 {
  grid-template-columns: repeat(3, 1fr);
}

.fg-4 {
  grid-template-columns: repeat(4, 1fr);
}

/* ── FORM FIELD ── */
.ff {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}

.ff label {
  font-size: 0.75rem;
  color: var(--tx1);
  letter-spacing: 0.6px;
  font-weight: 600;
  text-transform: uppercase;
}

.ff input,
.ff select,
.ff textarea {
  background: var(--bg0);
  border: 1px solid var(--br);
  color: var(--tx0);
  padding: 10px 12px;
  border-radius: var(--r2);
  font-family: 'Rajdhani', sans-serif;
  font-size: 0.92rem;
  transition: border-color 0.25s var(--ease), box-shadow 0.25s var(--ease), background 0.25s var(--ease);
  width: 100%;
  min-width: 0;
  -webkit-appearance: none;
  appearance: none;
}

.ff input:hover,
.ff select:hover {
  border-color: rgba(0, 212, 255, 0.3);
  background: rgba(6, 11, 20, 0.8);
}

.ff input:focus,
.ff select:focus {
  outline: none;
  border-color: var(--el);
  box-shadow: 0 0 0 3px var(--br2), 0 0 16px rgba(0, 212, 255, 0.1);
  background: rgba(10, 17, 32, 0.9);
}

.ff select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpath d='M0 0l5 6 5-6z' fill='%235a7899'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 30px;
  cursor: pointer;
}

.ff select option {
  background: var(--bg1);
}

.ff .unit {
  font-size: 0.72rem;
  color: var(--tx2);
  margin-top: 2px;
}

/* ── TOGGLE ── */
.tog-row {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.tog {
  appearance: none;
  -webkit-appearance: none;
  width: 46px;
  height: 26px;
  background: var(--bg0);
  border: 1.5px solid var(--br);
  border-radius: 13px;
  position: relative;
  cursor: pointer;
  transition: all 0.25s var(--ease);
  flex-shrink: 0;
}

.tog:hover {
  border-color: rgba(0, 212, 255, 0.4);
}

.tog:checked {
  background: var(--el3);
  border-color: var(--el);
}

.tog:focus-visible {
  outline: 2px solid var(--el);
  outline-offset: 2px;
}

.tog::after {
  content: '';
  position: absolute;
  top: 3px;
  left: 3px;
  width: 18px;
  height: 18px;
  background: var(--tx2);
  border-radius: 50%;
  transition: all 0.25s var(--ease);
}

.tog:checked::after {
  left: 23px;
  background: var(--el);
  box-shadow: 0 0 8px rgba(0, 212, 255, 0.4);
}

.tog-lbl {
  font-size: 0.875rem;
  color: var(--tx1);
}

/* ── ROOM CARD ── */
.room-card {
  background: var(--bg3);
  border: 1px solid var(--br);
  border-radius: var(--r);
  margin-bottom: 14px;
  overflow: hidden;
  transition: box-shadow 0.3s var(--ease);
}

.room-card:hover {
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.room-card-hdr {
  padding: 13px 16px;
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  user-select: none;
  background: linear-gradient(90deg, var(--bg4), var(--bg3));
  min-width: 0;
  transition: background 0.2s var(--ease);
}

.room-card-hdr:hover {
  background: var(--bg4);
}

.room-card-hdr .rn {
  font-family: 'Orbitron', monospace;
  font-size: 0.65rem;
  color: var(--am);
  background: rgba(255, 179, 0, 0.1);
  padding: 4px 10px;
  border-radius: 20px;
  border: 1px solid var(--am2);
  flex-shrink: 0;
  white-space: nowrap;
}

.room-card-hdr .rt {
  flex: 1;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--tx0);
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.room-card-hdr .rs {
  font-family: 'Share Tech Mono', monospace;
  font-size: 0.72rem;
  color: var(--tx2);
  flex-shrink: 0;
  white-space: nowrap;
}

.room-card-hdr .del {
  background: none;
  border: none;
  color: var(--rd);
  cursor: pointer;
  font-size: 1rem;
  padding: 6px 10px;
  border-radius: var(--r2);
  transition: background 0.2s var(--ease), transform 0.15s var(--ease);
  flex-shrink: 0;
  touch-action: manipulation;
}

.room-card-hdr .del:hover {
  background: rgba(255, 59, 59, 0.12);
  transform: scale(1.1);
}

.room-card-hdr .del:focus-visible {
  outline: 2px solid var(--rd);
  outline-offset: 2px;
}

.room-card-body {
  padding: 16px;
  border-top: 1px solid var(--br);
}

.room-card-body.collapsed {
  display: none;
}

/* ── LOAD SECTION ── */
.load-section {
  background: var(--bg0);
  border: 1px solid var(--br);
  border-radius: var(--r2);
  padding: 14px;
  margin-bottom: 12px;
}

.load-section h3 {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--el);
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.load-row {
  display: grid;
  grid-template-columns: 1fr auto auto;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
}

.load-row label {
  font-size: 0.875rem;
  color: var(--tx1);
}

.load-row input {
  width: 72px;
  background: var(--bg2);
  border: 1px solid var(--br);
  color: var(--tx0);
  padding: 6px 8px;
  border-radius: var(--r2);
  font-family: 'Share Tech Mono', monospace;
  font-size: 0.82rem;
  text-align: center;
  transition: border-color 0.2s var(--ease);
}

.load-row input:focus {
  outline: none;
  border-color: var(--el);
  box-shadow: 0 0 0 2px var(--br2);
}

.load-row .lu {
  font-size: 0.72rem;
  color: var(--tx2);
  min-width: 28px;
}

/* ── BUTTONS — enhanced with micro-animations ── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 20px;
  border-radius: var(--r2);
  border: none;
  font-family: 'Rajdhani', sans-serif;
  font-size: 0.9rem;
  font-weight: 700;
  cursor: pointer;
  letter-spacing: 0.5px;
  transition: all 0.25s var(--ease);
  touch-action: manipulation;
  white-space: nowrap;
  position: relative;
  overflow: hidden;
}

.btn:focus-visible {
  outline: 2px solid var(--el);
  outline-offset: 2px;
}

.btn:active {
  transform: scale(0.97) !important;
}

.btn-primary {
  background: linear-gradient(135deg, var(--el2), var(--el3));
  color: #fff;
  box-shadow: 0 2px 16px rgba(0, 102, 153, 0.4);
}

.btn-primary:hover {
  box-shadow: 0 4px 24px rgba(0, 212, 255, 0.35), 0 2px 8px rgba(0, 102, 153, 0.5);
  transform: translateY(-2px);
}

.btn-secondary {
  background: var(--bg3);
  color: var(--tx1);
  border: 1px solid var(--br);
}

.btn-secondary:hover {
  border-color: var(--el);
  color: var(--el);
  background: rgba(0, 212, 255, 0.05);
}

.btn-success {
  background: linear-gradient(135deg, var(--gr2), #009944);
  color: #000;
  box-shadow: 0 2px 16px rgba(0, 153, 68, 0.3);
}

.btn-success:hover {
  box-shadow: 0 4px 24px rgba(0, 255, 136, 0.3);
  transform: translateY(-2px);
}

.btn-amber {
  background: linear-gradient(135deg, var(--am2), #cc8800);
  color: #000;
  box-shadow: 0 2px 12px rgba(204, 136, 0, 0.3);
}

.btn-amber:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 20px rgba(255, 179, 0, 0.3);
}

.btn-danger {
  background: linear-gradient(135deg, var(--rd2), #881111);
  color: #fff;
}

.btn-danger:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 20px rgba(255, 59, 59, 0.3);
}

.btn-sm {
  padding: 7px 14px;
  font-size: 0.8rem;
}

.btn-lg {
  padding: 14px 30px;
  font-size: 1rem;
}

.btn-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 24px;
  flex-wrap: wrap;
}

/* ── RESULTS TABS ── */
.tab-bar {
  display: flex;
  gap: 0;
  border-bottom: 1px solid var(--br);
  margin-bottom: 20px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

.tab-bar::-webkit-scrollbar {
  display: none;
}

.tab-btn {
  padding: 12px 16px;
  background: none;
  border: none;
  color: var(--tx2);
  font-family: 'Rajdhani', sans-serif;
  font-size: 0.84rem;
  font-weight: 600;
  cursor: pointer;
  border-bottom: 3px solid transparent;
  transition: all 0.25s var(--ease);
  white-space: nowrap;
  flex-shrink: 0;
  touch-action: manipulation;
}

.tab-btn:hover {
  color: var(--tx1);
}

.tab-btn.active {
  color: var(--el);
  border-bottom-color: var(--el);
}

.tab-btn:focus-visible {
  outline: 2px solid var(--el);
  outline-offset: -2px;
}

.tab-panel {
  display: none;
}

.tab-panel.active {
  display: block;
  animation: fadeIn 0.3s var(--ease);
}

/* ── STATS GRID — with glow accents ── */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 14px;
  margin-bottom: 22px;
}

.stat-card {
  background: var(--bg2);
  border: 1px solid var(--br);
  border-radius: var(--r);
  padding: 16px 14px;
  text-align: center;
  position: relative;
  overflow: hidden;
  min-width: 0;
  transition: transform 0.25s var(--ease), box-shadow 0.25s var(--ease);
}

.stat-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-card-hover);
}

.stat-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--el2), var(--el));
}

.stat-card.amber::before {
  background: linear-gradient(90deg, var(--am2), var(--am));
}

.stat-card.green::before {
  background: linear-gradient(90deg, var(--gr2), var(--gr));
}

.stat-card.red::before {
  background: linear-gradient(90deg, var(--rd2), var(--rd));
}

.stat-card.purple::before {
  background: linear-gradient(90deg, #7c22cc, var(--pu));
}

.stat-val {
  font-family: 'Orbitron', monospace;
  font-size: clamp(1.05rem, 3vw, 1.5rem);
  font-weight: 700;
  color: var(--el);
  margin-bottom: 5px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  text-shadow: 0 0 18px rgba(0, 212, 255, 0.25);
}

.stat-card.amber .stat-val {
  color: var(--am);
  text-shadow: 0 0 18px rgba(255, 179, 0, 0.25);
}

.stat-card.green .stat-val {
  color: var(--gr);
  text-shadow: 0 0 18px rgba(0, 255, 136, 0.25);
}

.stat-card.red .stat-val {
  color: var(--rd);
  text-shadow: 0 0 18px rgba(255, 59, 59, 0.25);
}

.stat-card.purple .stat-val {
  color: var(--pu);
  text-shadow: 0 0 18px rgba(168, 85, 247, 0.25);
}

.stat-lbl {
  font-size: 0.72rem;
  color: var(--tx2);
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.stat-sub {
  font-size: 0.78rem;
  color: var(--tx1);
  margin-top: 4px;
}

/* ── TABLES ── */
.tbl-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border-radius: var(--r);
  border: 1px solid var(--br);
}

table {
  width: 100%;
  min-width: 680px;
  border-collapse: collapse;
  font-size: 0.85rem;
}

thead {
  background: var(--bg3);
}

thead th {
  padding: 12px 14px;
  text-align: left;
  font-family: 'Share Tech Mono', monospace;
  font-size: 0.7rem;
  color: var(--el);
  letter-spacing: 0.8px;
  border-bottom: 1px solid var(--br);
  white-space: nowrap;
}

tbody tr {
  border-bottom: 1px solid var(--br);
  transition: background 0.15s var(--ease);
}

tbody tr:hover {
  background: rgba(21, 33, 56, 0.6);
}

tbody tr:last-child {
  border-bottom: none;
}

tbody td {
  padding: 10px 14px;
  color: var(--tx1);
}

tbody td.mono {
  font-family: 'Share Tech Mono', monospace;
  font-size: 0.82rem;
  color: var(--el);
}

tbody td.warn {
  color: var(--am);
}

tbody td.ok {
  color: var(--gr);
}

tbody td.err {
  color: var(--rd);
}

.pill {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 12px;
  font-size: 0.7rem;
  font-family: 'Share Tech Mono', monospace;
  font-weight: 600;
  white-space: nowrap;
}

.pill-blue {
  background: rgba(0, 212, 255, 0.1);
  color: var(--el);
  border: 1px solid var(--el3);
}

.pill-amber {
  background: rgba(255, 179, 0, 0.1);
  color: var(--am);
  border: 1px solid var(--am2);
}

.pill-green {
  background: rgba(0, 255, 136, 0.1);
  color: var(--gr);
  border: 1px solid var(--gr2);
}

.pill-red {
  background: rgba(255, 59, 59, 0.1);
  color: var(--rd);
  border: 1px solid var(--rd2);
}

/* ── MATERIAL LIST ── */
.mat-cat {
  margin-bottom: 18px;
}

.mat-cat-hdr {
  font-family: 'Orbitron', monospace;
  font-size: 0.7rem;
  color: var(--am);
  letter-spacing: 2px;
  padding: 10px 0;
  border-bottom: 1px solid var(--br);
  margin-bottom: 10px;
}

.mat-row {
  display: grid;
  grid-template-columns: 1fr auto auto auto;
  gap: 10px;
  align-items: center;
  padding: 8px 0;
  border-bottom: 1px solid rgba(26, 42, 58, 0.6);
}

.mat-row:last-child {
  border-bottom: none;
}

.mat-item {
  font-size: 0.88rem;
  color: var(--tx0);
  min-width: 0;
}

.mat-spec {
  font-family: 'Share Tech Mono', monospace;
  font-size: 0.75rem;
  color: var(--tx2);
  min-width: 0;
}

.mat-qty {
  font-family: 'Share Tech Mono', monospace;
  font-size: 0.88rem;
  color: var(--el);
  font-weight: 600;
  text-align: right;
}

.mat-unit {
  font-size: 0.72rem;
  color: var(--tx2);
  min-width: 36px;
}

/* ── SVG DIAGRAMS ── */
.diag-wrap {
  background: var(--bg0);
  border: 1px solid var(--br);
  border-radius: var(--r);
  overflow: hidden;
  box-shadow: var(--shadow-card);
}

.diag-title {
  padding: 13px 18px;
  background: var(--bg2);
  border-bottom: 1px solid var(--br);
  font-family: 'Orbitron', monospace;
  font-size: clamp(0.6rem, 2vw, 0.8rem);
  color: var(--el);
  letter-spacing: 0.5px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.diag-svg-wrap {
  overflow: auto;
  -webkit-overflow-scrolling: touch;
  padding: 12px;
  max-width: 100%;
}

.diag-svg-wrap svg {
  display: block;
  max-width: none;
}

/* ── WARNINGS ── */
.alert-bar {
  background: linear-gradient(90deg, rgba(255, 140, 0, 0.12), rgba(255, 179, 0, 0.12));
  border: 1px solid var(--am2);
  border-radius: var(--r2);
  padding: 12px 16px;
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.84rem;
  color: var(--am);
  margin-bottom: 16px;
  line-height: 1.6;
}

.warn-box {
  background: rgba(255, 179, 0, 0.06);
  border: 1px solid var(--am2);
  border-radius: var(--r2);
  padding: 12px 16px;
  margin-bottom: 12px;
  display: flex;
  gap: 12px;
  align-items: flex-start;
}

.warn-box .wi {
  font-size: 1rem;
  flex-shrink: 0;
  margin-top: 1px;
}

.warn-box p {
  font-size: 0.875rem;
  color: var(--am);
  line-height: 1.6;
}

.error-box {
  background: rgba(255, 59, 59, 0.06);
  border: 1px solid var(--rd2);
  border-radius: var(--r2);
  padding: 12px 16px;
  margin-bottom: 12px;
  display: flex;
  gap: 12px;
  align-items: flex-start;
}

.error-box p {
  font-size: 0.875rem;
  color: var(--rd);
  line-height: 1.6;
}

.ok-box {
  background: rgba(0, 255, 136, 0.06);
  border: 1px solid var(--gr2);
  border-radius: var(--r2);
  padding: 12px 16px;
  margin-bottom: 12px;
  display: flex;
  gap: 12px;
  align-items: flex-start;
}

.ok-box p {
  font-size: 0.875rem;
  color: var(--gr);
  line-height: 1.6;
}

/* ── MISC ── */
.progress-bar {
  background: var(--bg3);
  border-radius: 10px;
  height: 6px;
  overflow: hidden;
  margin-top: 8px;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--el2), var(--el));
  border-radius: 10px;
  transition: width 0.3s;
  box-shadow: 0 0 10px var(--el);
}

.ckt-type {
  font-size: 0.7rem;
  padding: 3px 9px;
  border-radius: 10px;
  font-weight: 700;
  white-space: nowrap;
}

.ckt-light {
  background: rgba(0, 212, 255, 0.1);
  color: var(--el);
  border: 1px solid var(--el3);
}

.ckt-sock {
  background: rgba(255, 179, 0, 0.1);
  color: var(--am);
  border: 1px solid var(--am2);
}

.ckt-heavy {
  background: rgba(255, 59, 59, 0.1);
  color: var(--rd);
  border: 1px solid var(--rd2);
}

.ckt-ac {
  background: rgba(168, 85, 247, 0.1);
  color: var(--pu);
  border: 1px solid #7c22cc;
}

.mono {
  font-family: 'Share Tech Mono', monospace;
}

.el {
  color: var(--el);
}

.am {
  color: var(--am);
}

.gr {
  color: var(--gr);
}

.rd {
  color: var(--rd);
}

.sep {
  height: 1px;
  background: var(--br);
  margin: 16px 0;
}

.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 14px;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.78rem;
  color: var(--tx1);
}

.legend-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}

/* ── LOADING ── */
#loading-overlay {
  position: fixed;
  inset: 0;
  background: var(--bg0);
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 24px;
  transition: opacity 0.5s var(--ease);
}

#loading-overlay.hide {
  opacity: 0;
  pointer-events: none;
  display: none;
}

.loader-ring {
  width: 56px;
  height: 56px;
  border: 3px solid var(--br);
  border-top-color: var(--el);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.loader-txt {
  font-family: 'Orbitron', monospace;
  font-size: 0.85rem;
  color: var(--el);
  letter-spacing: 3px;
  text-shadow: 0 0 12px rgba(0, 212, 255, 0.3);
}

/* ── SCROLLBAR ── */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

::-webkit-scrollbar-track {
  background: var(--bg1);
}

::-webkit-scrollbar-thumb {
  background: var(--el3);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--el);
}

/* ── ANIMATIONS ── */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes shimmer {
  0% {
    background-position: -200% center;
  }

  100% {
    background-position: 200% center;
  }
}

.calculating {
  background: linear-gradient(90deg, var(--bg2), var(--bg3), var(--bg2));
  background-size: 200%;
  animation: shimmer 1.5s infinite;
  pointer-events: none;
}

/* ── TOOLTIP ── */
.tip {
  position: relative;
  cursor: help;
}

.tip::after {
  content: attr(data-tip);
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(-4px);
  background: var(--bg4);
  border: 1px solid var(--br);
  color: var(--tx1);
  font-size: 0.72rem;
  padding: 6px 12px;
  border-radius: var(--r2);
  white-space: nowrap;
  display: none;
  z-index: 100;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.4);
  font-family: 'Rajdhani', sans-serif;
}

.tip:hover::after {
  display: block;
}

/* ── FOOTER ── */
#ftr {
  text-align: center;
  padding: 24px 20px;
  color: var(--tx2);
  font-size: 0.72rem;
  border-top: 1px solid var(--br);
  margin-top: 48px;
  letter-spacing: 0.8px;
  line-height: 1.8;
  background: linear-gradient(180deg, transparent, rgba(10, 17, 32, 0.5));
}

/* ── DB LAYOUT ELEMENTS ── */
.db-outer {
  background: #1a1a1a;
  border: 3px solid #888;
  border-radius: 6px;
  padding: 16px;
  display: inline-block;
  min-width: 400px;
  font-family: 'Share Tech Mono', monospace;
}

.db-inner {
  background: #222;
  border: 2px solid #555;
  border-radius: 3px;
  padding: 10px;
}

.db-row {
  display: flex;
  gap: 4px;
  margin-bottom: 4px;
}

.breaker {
  width: 50px;
  height: 80px;
  border-radius: 3px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  padding: 4px 2px;
  font-size: 8px;
  text-align: center;
  cursor: default;
  border: 1px solid #555;
}

.br-mcb {
  background: linear-gradient(180deg, #2a2a4a, #1a1a3a);
  color: var(--el);
}

.br-rcd {
  background: linear-gradient(180deg, #2a4a2a, #1a3a1a);
  color: var(--gr);
}

.br-rcbo {
  background: linear-gradient(180deg, #4a2a4a, #3a1a3a);
  color: var(--pu);
}

.br-spd {
  background: linear-gradient(180deg, #4a3a1a, #3a2a0a);
  color: var(--am);
}

.br-main {
  background: linear-gradient(180deg, #4a1a1a, #3a0a0a);
  color: var(--rd);
  width: 60px;
  height: 90px;
}

.br-handle {
  width: 16px;
  height: 20px;
  background: #ccc;
  border-radius: 2px;
  margin: 4px auto;
}

.br-trip {
  width: 16px;
  height: 6px;
  background: #ff4444;
  border-radius: 1px;
}

.neutral-bar {
  background: #888;
  height: 16px;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 8px;
  color: #fff;
  margin: 4px 0;
  letter-spacing: 2px;
}

.earth-bar {
  background: #006600;
  height: 16px;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 8px;
  color: #fff;
  margin: 4px 0;
  letter-spacing: 2px;
}

/* ── SUPPLY SUMMARY BOXES (results page) ── */
.ssb {
  background: var(--bg0);
  border: 1px solid var(--br);
  border-radius: 8px;
  padding: 16px;
  min-width: 0;
  transition: box-shadow 0.3s var(--ease);
}

.ssb:hover {
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.3);
}

.ssb-lbl {
  font-size: 0.72rem;
  color: var(--tx2);
  text-transform: uppercase;
  letter-spacing: 0.6px;
  margin-bottom: 6px;
}

.ssb-val {
  font-family: 'Share Tech Mono', monospace;
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 5px;
}

.ssb-sub {
  font-size: 0.78rem;
  color: var(--tx2);
  line-height: 1.6;
}


/* ════════════════════════════════════════════════════════
   RESPONSIVE BREAKPOINTS
   ════════════════════════════════════════════════════════ */

/* ── 1200px: large tablets ── */
@media (max-width: 1200px) {
  .fg-4 {
    grid-template-columns: repeat(3, 1fr);
  }

  .stats-grid {
    grid-template-columns: repeat(auto-fill, minmax(145px, 1fr));
  }
}

/* ── 900px: tablets landscape ── */
@media (max-width: 900px) {
  #main {
    padding: 18px 16px;
  }

  .fg-3 {
    grid-template-columns: repeat(2, 1fr);
  }

  .fg-4 {
    grid-template-columns: repeat(2, 1fr);
  }

  .mat-row {
    grid-template-columns: 1fr auto auto;
  }

  .mat-spec {
    display: none;
  }
}

/* ── 700px: tablets portrait ── */
@media (max-width: 700px) {
  #hdr {
    padding: 10px 14px;
    min-height: 58px;
  }

  #hdr .logo svg {
    width: 30px;
    height: 30px;
  }

  #hdr h1 {
    font-size: 0.62rem;
  }

  #hdr h1 span {
    display: none;
  }

  #hdr .badge span {
    font-size: 0.52rem;
    padding: 2px 7px;
  }

  /* Step nav: show number badge only */
  .step-btn {
    padding: 12px 10px;
    font-size: 0;
    gap: 0;
  }

  .step-btn .sn {
    width: 28px;
    height: 28px;
    font-size: 0.74rem;
  }

  .step-sep {
    padding: 0 3px;
    font-size: 0.7rem;
  }

  #main {
    padding: 14px 12px;
  }

  .sc-body {
    padding: 14px;
  }

  .sc-hdr {
    padding: 12px 14px;
  }

  .sc-hdr h2 {
    font-size: 0.64rem;
    letter-spacing: 0;
  }

  /* All form grids → single column */
  .fg-2,
  .fg-3,
  .fg-4 {
    grid-template-columns: 1fr;
  }

  .room-card-hdr {
    padding: 11px 13px;
    gap: 8px;
  }

  .room-card-hdr .rs {
    display: none;
  }

  .room-card-body {
    padding: 14px;
  }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
  }

  .stat-card {
    padding: 14px 10px;
  }

  .stat-val {
    font-size: 1.05rem;
  }

  .stat-lbl {
    font-size: 0.65rem;
  }

  .tab-btn {
    padding: 10px 12px;
    font-size: 0.74rem;
  }

  .btn-lg {
    padding: 12px 22px;
    font-size: 0.95rem;
  }

  .btn-row {
    gap: 10px;
  }

  .mat-row {
    grid-template-columns: 1fr auto auto;
    gap: 8px;
  }

  .mat-spec {
    display: none;
  }

  .alert-bar {
    font-size: 0.78rem;
    padding: 10px 14px;
  }

  .diag-title span {
    display: none;
  }
}

/* ── 550px: large phones ── */
@media (max-width: 550px) {
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  /* Load rows: label left, input right, hide unit */
  .load-row {
    grid-template-columns: 1fr auto;
  }

  .load-row .lu {
    display: none;
  }

  .mat-row {
    grid-template-columns: 1fr auto;
  }

  .mat-unit {
    display: none;
  }

  .room-card-hdr .rn {
    display: none;
  }

  /* Primary action buttons stretch full width */
  .btn-row .btn-primary,
  .btn-row .btn-success {
    width: 100%;
    justify-content: center;
  }

  #ftr {
    font-size: 0.64rem;
    padding: 16px 12px;
  }
}

/* ── 420px: small phones ── */
@media (max-width: 420px) {
  #hdr .badge {
    display: none;
  }

  #hdr h1 {
    font-size: 0.58rem;
  }

  .stats-grid {
    grid-template-columns: 1fr 1fr;
    gap: 8px;
  }

  .stat-card {
    padding: 12px 8px;
  }

  .stat-val {
    font-size: 0.92rem;
  }

  .stat-lbl {
    font-size: 0.6rem;
  }

  .stat-sub {
    display: none;
  }

  .tab-btn {
    padding: 9px 9px;
    font-size: 0.68rem;
    letter-spacing: 0;
  }

  .btn {
    font-size: 0.82rem;
    padding: 10px 16px;
  }

  .btn-lg {
    font-size: 0.88rem;
    padding: 11px 18px;
  }

  .btn-sm {
    padding: 6px 12px;
    font-size: 0.75rem;
  }

  .load-row input {
    width: 62px;
  }

  .sc-body {
    padding: 12px;
  }

  .room-card-body {
    padding: 12px;
  }
}

/* ── REDUCED MOTION (accessibility) ── */
@media (prefers-reduced-motion: reduce) {

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ── PRINT ── */
@media print {
  body {
    background: #fff;
    color: #000;
  }

  #hdr,
  #stepnav,
  .btn-row,
  .tab-bar,
  #calc-btn-row {
    display: none !important;
  }

  .step-page {
    display: block !important;
  }

  .diag-wrap {
    border: 1px solid #ccc;
  }

  .stat-val {
    color: #000066;
    text-shadow: none;
  }

  .stat-card::before {
    background: #003399;
  }

  table {
    font-size: 9px;
    min-width: unset;
  }

  .sc {
    border: 1px solid #ccc;
    margin-bottom: 8px;
    box-shadow: none;
  }

  .sc:hover {
    box-shadow: none;
    transform: none;
  }

  .stat-card:hover {
    transform: none;
    box-shadow: none;
  }
}

/* ── TECHNOID FOOTER ── */
.tech-footer {
  background: var(--bg2);
  border-top: 1px solid var(--br);
  padding: 40px 20px 20px;
  text-align: center;
  margin-top: 40px;
  font-family: 'Rajdhani', sans-serif;
  color: var(--tx1);
}

.tech-footer .container {
  max-width: 1200px;
  margin: 0 auto;
}

.tech-footer .footer-brand {
  font-family: 'Orbitron', monospace;
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--tx0);
  margin-bottom: 8px;
}

.tech-footer .footer-tagline {
  font-size: 0.95rem;
  color: var(--tx2);
  margin-bottom: 20px;
}

.tech-footer .social-links {
  display: flex;
  gap: 16px;
  justify-content: center;
}

.tech-footer .social-links a {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: rgba(0, 212, 255, 0.05);
  border: 1px solid var(--br);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--el);
  font-size: 1.1rem;
  transition: all 0.25s var(--ease);
  text-decoration: none;
}

.tech-footer .social-links a:hover {
  background: var(--el);
  color: #000;
  box-shadow: 0 0 15px rgba(0, 212, 255, 0.4);
}

.tech-footer .footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 20px;
  margin-bottom: 30px;
}

.tech-footer .footer-links a {
  color: var(--tx0);
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  transition: color 0.2s var(--ease);
}

.tech-footer .footer-links a:hover {
  color: var(--el);
}

.tech-footer .footer-divider {
  border: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--br), transparent);
  margin: 30px 0 20px;
}

.tech-footer .footer-bottom {
  font-size: 0.85rem;
  color: var(--tx2);
}