/* =========================================================
   FrigProp — Industrial Precision Theme
   ========================================================= */

:root {
  --bg:          #0a0e14;
  --surface:     #111820;
  --surface2:    #162030;
  --border:      #1e2d3d;
  --border2:     #2a3f55;
  --accent:      #00d4ff;
  --accent2:     #ff6b35;
  --accent3:     #39e58c;
  --text:        #c8d8e8;
  --text-dim:    #5a7a94;
  --text-bright: #eaf4ff;
  --danger:      #ff4757;
  --warn:        #ffa502;
  --mono:        'IBM Plex Mono', monospace;
  --sans:        'IBM Plex Sans', sans-serif;
  --nav-h:       52px;
  --left-w:      320px;
  --gap:         14px;
  --radius:      10px;
  --radius-sm:   5px;
}

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

html { min-height: 100%; }

body {
  min-height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 13px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

/* Grid texture */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(0,212,255,.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,212,255,.03) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
  z-index: 0;
}

/* =========================================================
   Navigation bar
   ========================================================= */

nav {
  position: sticky;
  top: 0;
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-h);
  padding: 0 20px;
  background: rgba(10,14,20,.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  box-shadow: 0 1px 0 var(--border), inset 0 1px 0 rgba(0,212,255,.04);
}

.logo {
  font-family: var(--mono);
  font-size: 17px;
  font-weight: 600;
  color: var(--text-bright);
  letter-spacing: 0.04em;
}

.logo span { color: var(--accent); }

.version-tag {
  color: var(--text-dim) !important;
  font-size: 10px;
  font-family: var(--mono);
  font-weight: 400;
  margin-left: 7px;
  vertical-align: 2px;
  letter-spacing: 0.04em;
}

/* SI / US unit system toggle */
.unit-toggle {
  display: inline-flex;
  background: rgba(0,0,0,.35);
  border: 1px solid var(--border2);
  border-radius: var(--radius-sm);
  padding: 2px;
  cursor: pointer;
  margin-left: 10px;
}

.unit-toggle .unit-opt {
  font-family: var(--mono);
  font-size: 10.5px;
  padding: 3px 9px;
  border-radius: 3px;
  color: var(--text-dim);
  transition: background .12s, color .12s;
}

.unit-toggle .unit-opt.active {
  background: rgba(0,212,255,.14);
  color: var(--accent);
}

.nav-ref-display {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--accent);
  letter-spacing: 0.06em;
  opacity: 0.85;
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* =========================================================
   Status badge
   ========================================================= */

.nav-badge {
  font-family: var(--mono);
  font-size: 10px;
  padding: 4px 12px;
  border-radius: 20px;
  font-weight: 500;
  letter-spacing: 0.06em;
  border: 1px solid transparent;
  transition: all 0.2s;
}

.nav-badge.loading { background: rgba(255,255,255,.03); color: var(--text-dim); border-color: var(--border); }
.nav-badge.ready   { background: rgba(57,229,140,.07);  color: var(--accent3); border-color: rgba(57,229,140,.22); }
.nav-badge.error   { background: rgba(255,71,87,.07);   color: var(--danger);  border-color: rgba(255,71,87,.22); }
.nav-badge.working { background: rgba(0,212,255,.07);   color: var(--accent);  border-color: rgba(0,212,255,.22); }

/* =========================================================
   Tiled layout
   ========================================================= */

.app-body {
  display: flex;
  flex-direction: column;
  gap: var(--gap);
  padding: var(--gap);
  position: relative;
  z-index: 1;
  max-width: 1100px;
  margin: 0 auto;
}

/* Full-width gallery pane on top, columns below */
.pane-gallery {
  width: 100%;
}

.app-columns {
  display: flex;
  gap: var(--gap);
  align-items: flex-start;
}

/* Left column — stacked panes, full content always visible */
.col-left {
  width: var(--left-w);
  min-width: 240px;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  gap: var(--gap);
}

/* Right column — flex container for cycle pane + chart pane */
.col-right {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: var(--gap);
}

/* =========================================================
   Pane — floating tile
   ========================================================= */

.pane {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow:
    0 8px 32px rgba(0,0,0,.35),
    0 2px 8px rgba(0,0,0,.25),
    inset 0 1px 0 rgba(255,255,255,.03);
  position: relative;
}

/* Subtle top glow line */
.pane::before {
  content: '';
  position: absolute;
  top: 0; left: 10%; right: 10%;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(0,212,255,.18), transparent);
  z-index: 1;
  pointer-events: none;
}

/* =========================================================
   Panel headers
   ========================================================= */

.panel-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px 9px;
  background: rgba(0,0,0,.25);
  border-bottom: 1px solid var(--border);
  font-family: var(--sans);
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--text-dim);
  text-transform: uppercase;
}

/* Sub-section headers inside the right pane (not the pane title) */
.panel-header-sub {
  margin-top: 8px;
  background: rgba(0,0,0,.18);
  border-top: 1px solid var(--border);
}

.panel-title::before {
  content: '';
  display: inline-block;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--accent);
  margin-right: 7px;
  opacity: 0.6;
  flex-shrink: 0;
  vertical-align: middle;
}

/* =========================================================
   Refrigerant card grid
   ========================================================= */

.refrig-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
}

.ref-card {
  background: var(--surface);
  padding: 11px 13px 9px;
  cursor: pointer;
  transition: background 0.12s, box-shadow 0.12s;
  display: flex;
  flex-direction: column;
  gap: 5px;
  position: relative;
  overflow: hidden;
  border-right: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.ref-card::after {
  content: '';
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 2px;
  background: transparent;
  transition: background 0.15s;
}

.ref-card:hover                { background: var(--surface2); }
.ref-card:hover::after         { background: rgba(0,212,255,.4); }
.ref-card.selected             { background: rgba(0,212,255,.05); }
.ref-card.selected::after      { background: var(--accent); }

.ref-card-name {
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 600;
  color: var(--text-bright);
  letter-spacing: 0.04em;
}

.ref-card.selected .ref-card-name::after {
  content: ' ✓';
  color: var(--accent);
  font-size: 11px;
}

.ref-card-meta {
  display: flex;
  align-items: center;
  gap: 4px;
  flex-wrap: wrap;
}

.ref-badge {
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  padding: 1px 5px;
  border-radius: 3px;
}

.ref-badge-type-hfc     { background: rgba(0,212,255,.12);  color: var(--accent); }
.ref-badge-type-hfo     { background: rgba(57,229,140,.12); color: var(--accent3); }
.ref-badge-type-hcfo    { background: rgba(57,229,140,.10); color: #8fdc6a; }
.ref-badge-type-hcfc    { background: rgba(255,165,2,.10);  color: var(--warn); }
.ref-badge-type-cfc     { background: rgba(255,71,87,.10);  color: var(--danger); }
.ref-badge-type-natural { background: rgba(57,229,140,.15); color: #2dd4a3; border: 1px solid rgba(57,229,140,.2); }
.ref-badge-type-blend   { background: rgba(168,130,230,.12); color: #a882e6; }
.ref-badge-safety       { background: rgba(255,255,255,.04); color: var(--text-dim); border: 1px solid var(--border2); }

.ref-badge-gwp-low   { color: var(--accent3); }
.ref-badge-gwp-mid   { color: var(--text-dim); }
.ref-badge-gwp-high  { color: var(--warn); }
.ref-badge-gwp-vhigh { color: var(--danger); }

.ref-card-stats {
  font-family: var(--mono);
  font-size: 10px;
  color: var(--text-dim);
  display: flex;
  gap: 8px;
}

.ref-card-stat-val { color: var(--text); }

/* =========================================================
   Info / properties panel
   ========================================================= */

.info-placeholder {
  color: var(--text-dim);
  font-size: 12px;
  padding: 20px 16px;
  font-style: italic;
  text-align: center;
  line-height: 1.7;
}

.info-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 12px;
}

.info-table tr { border-bottom: 1px solid var(--border); }
.info-table tr:hover td { background: rgba(0,212,255,.03); }

.info-table td { padding: 5px 14px; vertical-align: top; }

.info-key {
  color: var(--text-dim);
  white-space: nowrap;
  width: 45%;
  font-size: 11px;
}

.info-val {
  color: var(--text-bright);
  word-break: break-word;
  font-weight: 500;
}

.info-val.highlight { color: var(--accent); font-family: var(--mono); }
.info-val.warn      { color: var(--warn); }
.info-val.danger    { color: var(--danger); }
.info-val.good      { color: var(--accent3); }
.info-val.dim       { color: var(--text-dim); }

/* Property rows with hover explanations */
.info-key.has-tip {
  cursor: help;
  text-decoration: underline dotted rgba(90,122,148,.55);
  text-underline-offset: 3px;
}

.info-section-header {
  font-size: 9px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-dim);
  padding: 6px 14px 5px;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

/* =========================================================
   Cycle analysis — state sections
   ========================================================= */

.range-hint {
  font-size: 10.5px;
  color: var(--text-dim);
  margin: 8px 0 2px;
  font-family: var(--mono);
}

.calc-body {
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.cycle-section {
  background: rgba(0,0,0,.18);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 13px 15px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: border-color 0.15s;
}

.cycle-section:hover {
  border-color: var(--border2);
}

.cycle-section-derived {
  background: transparent;
  border-style: dashed;
  border-color: rgba(30,45,61,.8);
  opacity: 0.7;
}

.cycle-point-header {
  display: flex;
  align-items: center;
  gap: 10px;
}

.cycle-point-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 700;
  flex-shrink: 0;
}

.cycle-point-num.active {
  background: rgba(0,212,255,.1);
  border: 1px solid rgba(0,212,255,.3);
  color: var(--accent);
}

.cycle-point-num.derived {
  background: transparent;
  border: 1px solid var(--border2);
  color: var(--text-dim);
  font-size: 12px;
}

.cycle-point-title {
  font-weight: 600;
  color: var(--text-bright);
  font-size: 13px;
  flex: 1;
}

/* State badges */
.state-badge {
  font-family: var(--mono);
  font-size: 10px;
  padding: 2px 8px;
  border-radius: 3px;
  font-weight: 500;
  letter-spacing: 0.04em;
  white-space: nowrap;
}

.state-saturated   { background: rgba(0,212,255,.1);  color: var(--accent);  border: 1px solid rgba(0,212,255,.2); }
.state-superheated { background: rgba(255,107,53,.1); color: var(--accent2); border: 1px solid rgba(255,107,53,.2); }
.state-subcooled   { background: rgba(57,229,140,.1); color: var(--accent3); border: 1px solid rgba(57,229,140,.2); }
.state-flash       { background: rgba(255,165,2,.1);  color: var(--warn);    border: 1px solid rgba(255,165,2,.2); }
.state-badge-derived { background: transparent; border: 1px solid var(--border2); color: var(--text-dim); }

/* Form rows — label stays beside input; no space-between stretching */
.form-row {
  display: flex;
  align-items: center;
  gap: 14px;
}

.form-row > label {
  color: var(--text-dim);
  font-size: 12px;
  min-width: 165px;
  flex-shrink: 0;
}

/* Narrow left-column panes: tighter rows so inputs never clip on the right */
.col-left .form-row { justify-content: space-between; gap: 8px; }
.col-left .form-row > label { min-width: 0; }
.col-left .input-group { flex-shrink: 0; }
.col-left .input-group input[type="number"] { width: 84px; }
.col-left .lookup-select { max-width: 160px; }

/* Input groups */
.input-group {
  display: inline-flex;
  align-items: stretch;
  border: 1px solid var(--border2);
  border-radius: var(--radius-sm);
  overflow: hidden;
  transition: border-color .15s, box-shadow .15s;
}

.input-group:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(0,212,255,.1);
}

.lookup-select {
  background: rgba(0,0,0,.4);
  border: 1px solid var(--border2);
  border-radius: var(--radius-sm);
  color: var(--text-bright);
  font-family: var(--mono);
  font-size: 12.5px;
  padding: 7px 8px;
  outline: none;
  transition: border-color .15s, box-shadow .15s;
}

.lookup-select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(0,212,255,.1);
}

.input-group input[type="number"] {
  background: rgba(0,0,0,.4);
  border: none;
  color: var(--text-bright);
  font-family: var(--mono);
  font-size: 13px;
  padding: 7px 8px;
  width: 120px;
  text-align: center;
  outline: none;
  -moz-appearance: textfield;
}

.input-group input[type="number"]::-webkit-inner-spin-button,
.input-group input[type="number"]::-webkit-outer-spin-button { opacity: 0.4; }

.input-group input[type="number"]::placeholder {
  color: var(--text-dim);
  font-size: 11px;
  text-align: center;
}

.input-unit {
  background: var(--surface2);
  color: var(--text-dim);
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 600;
  padding: 7px 10px;
  border-left: 1px solid var(--border2);
  white-space: nowrap;
  letter-spacing: 0.04em;
  display: flex;
  align-items: center;
}

/* Checkboxes */
.mod-checkbox {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-size: 12px;
  color: var(--text-dim);
  cursor: pointer;
  transition: color .1s;
  user-select: none;
}

.mod-checkbox:hover { color: var(--text); }

.mod-checkbox input[type="checkbox"] {
  accent-color: var(--accent);
  cursor: pointer;
  width: 13px;
  height: 13px;
}

.extra-fields {
  border-top: 1px solid var(--border);
  padding-top: 10px;
}

/* Derived state rows */
.derived-row {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.derived-item {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--text-dim);
  display: inline-flex;
  align-items: baseline;
  gap: 3px;
}

.derived-sep {
  color: var(--border2);
  font-size: 16px;
  line-height: 1;
}

.derived-note {
  font-size: 10px;
  color: var(--text-dim);
  opacity: 0.55;
  margin-left: 2px;
}

/* =========================================================
   Calculate button
   ========================================================= */

.calc-btn {
  width: 100%;
  padding: 12px 20px;
  background: linear-gradient(135deg, rgba(0,212,255,.14) 0%, rgba(0,212,255,.06) 100%);
  border: 1px solid rgba(0,212,255,.28);
  border-radius: var(--radius-sm);
  color: var(--accent);
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  cursor: pointer;
  transition: background .15s, border-color .15s, box-shadow .15s, color .15s;
  margin-top: 4px;
}

.calc-btn:hover:not(:disabled) {
  background: linear-gradient(135deg, rgba(0,212,255,.22) 0%, rgba(0,212,255,.12) 100%);
  border-color: var(--accent);
  color: var(--text-bright);
  box-shadow: 0 0 24px rgba(0,212,255,.18), 0 2px 8px rgba(0,0,0,.4);
}

.calc-btn:disabled {
  opacity: 0.28;
  cursor: not-allowed;
}

/* =========================================================
   Alert boxes
   ========================================================= */

.alert-box {
  margin: 10px 16px;
  padding: 11px 14px;
  border-radius: var(--radius-sm);
  font-size: 12px;
  border-left: 3px solid;
  line-height: 1.5;
}

.alert-warn     { background: rgba(255,165,2,.07);  border-color: var(--warn);    color: var(--warn); }
.alert-info     { background: rgba(0,212,255,.06);  border-color: var(--accent);  color: var(--accent); }
.alert-transcrit{ background: rgba(255,107,53,.07); border-color: var(--accent2); color: var(--accent2); }
.alert-error    { background: rgba(255,71,87,.07);  border-color: var(--danger);  color: var(--danger); }

.alert-box ul { margin: 4px 0 0; padding-left: 18px; }
.alert-box li { margin-bottom: 3px; }

/* =========================================================
   Results — state table
   ========================================================= */

.table-wrap {
  overflow-x: auto;
}

.results-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--mono);
  font-size: 12px;
}

.results-table thead tr { border-bottom: 1px solid var(--border2); }

.results-table th {
  font-family: var(--sans);
  font-size: 9px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-dim);
  text-align: right;
  padding: 7px 12px;
  font-weight: 700;
  background: rgba(0,0,0,.15);
  white-space: nowrap;
}

.th-unit { font-weight: 400; opacity: 0.6; }
.results-table th:first-child { text-align: center; }

.results-table td {
  padding: 8px 12px;
  text-align: right;
  border-bottom: 1px solid var(--border);
  color: var(--text-bright);
  letter-spacing: 0.02em;
}

.results-table td:first-child { text-align: center; }
.results-table tbody tr:nth-child(even) td { background: rgba(0,0,0,.12); }
.results-table tbody tr:hover td { background: rgba(0,212,255,.04); }

.val-x-twophase { color: var(--warn); }
.val-x-single   { color: var(--text-dim); }
.val-vapor      { color: var(--accent); }
.val-liquid     { color: var(--accent3); }

/* =========================================================
   Results — performance metrics
   ========================================================= */

.results.calc-body {
  gap: 3px;
  padding-top: 12px;
  padding-bottom: 20px;
}

.section-divider {
  font-family: var(--sans);
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  padding: 10px 0 5px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 2px;
}

.result-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding: 6px 0;
  border-bottom: 1px solid rgba(255,255,255,.025);
}

.result-key {
  color: var(--text-dim);
  font-size: 12px;
}

.result-val {
  font-family: var(--mono);
  font-size: 14px;
  font-weight: 600;
  color: var(--text-bright);
  letter-spacing: 0.02em;
}

.result-val .unit {
  font-size: 10px;
  font-weight: 400;
  color: var(--text-dim);
  margin-left: 3px;
}

.result-highlight { color: var(--accent); font-size: 18px; }
.result-ok        { color: var(--accent3); }

/* =========================================================
   T-s diagram chart pane
   ========================================================= */

.chart-fluid-label {
  font-family: var(--mono);
  font-size: 10px;
  color: var(--accent);
  letter-spacing: 0.06em;
  opacity: 0.75;
}

.chart-btn {
  margin-left: auto;
  background: rgba(0,212,255,0.08);
  border: 1px solid rgba(0,212,255,0.2);
  border-radius: var(--radius-sm);
  color: var(--accent);
  font-family: var(--mono);
  font-size: 10px;
  padding: 3px 9px;
  cursor: pointer;
  letter-spacing: 0.06em;
  transition: background 0.15s, border-color 0.15s;
}
.chart-btn:hover { background: rgba(0,212,255,0.16); border-color: var(--accent); }

.chart-wrap {
  position: relative;
  width: 100%;
  height: 340px;
  padding: 12px 16px 16px;
}

.chart-wrap canvas {
  display: block;
  width: 100% !important;
  height: 100% !important;
}

/* =========================================================
   Utilities
   ========================================================= */

.hidden { display: none !important; }

::-webkit-scrollbar { width: 5px; height: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border2); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: rgba(0,212,255,.3); }

/* =========================================================
   Responsive
   ========================================================= */

/* Tablet: stack columns vertically, left panes go side-by-side */
@media (max-width: 920px) {
  .app-columns {
    flex-direction: column;
  }

  .col-left {
    width: 100%;
    min-width: 0;
    flex-direction: row;
    flex-wrap: wrap;
    gap: var(--gap);
  }

  .col-left > .pane {
    flex: 1;
    min-width: 260px;
  }

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

  .col-right { width: 100%; flex-direction: column; }
}

/* Narrow tablet / large phone: stack form rows */
@media (max-width: 640px) {
  .form-row {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
  }

  .form-row > label {
    min-width: 0;
  }

  .input-group {
    width: 100%;
  }

  .input-group input[type="number"] {
    flex: 1;
    width: auto;
    min-width: 0;
    text-align: left;
  }

  .input-group input[type="number"]::placeholder {
    text-align: left;
  }
}

/* Small phone */
@media (max-width: 500px) {
  :root { --gap: 10px; --left-w: 100%; }

  .chart-wrap { height: 240px; }

  nav { padding: 0 14px; }
  .nav-ref-display { display: none; }

  .col-left {
    flex-direction: column;
  }

  .col-left > .pane {
    min-width: 0;
    width: 100%;
  }

  .refrig-grid { grid-template-columns: 1fr 1fr; }

  .calc-body { padding: 12px 12px; }

  .cycle-section { padding: 12px; }

  .cycle-point-title { font-size: 12px; }

  .results-table { font-size: 11px; }
  .results-table th,
  .results-table td { padding: 6px 8px; }
}