/* ── CSS Custom Properties ────────────────────────────────── */
:root {
  /* Backgrounds */
  --color-background-primary:   #FFFFFF;
  --color-background-secondary: #F5F5F5;
  --color-background-tertiary:  #EFEFEF;
  --color-background-info:      #E6F1FB;

  /* Text */
  --color-text-primary:   #1A1A1A;
  --color-text-secondary: #666666;
  --color-text-tertiary:  #999999;
  --color-text-info:      #185FA5;

  /* Borders */
  --color-border-primary:   #999999;
  --color-border-secondary: #CCCCCC;
  --color-border-tertiary:  #E0E0E0;
  --color-border-info:      #B5D4F4;

  /* Semantic (reserved) */
  --color-danger:  #dc2626;
  --color-warning: #d97706;
  --color-success: #16a34a;

  /* Radii */
  --border-radius-md: 8px;
  --border-radius-lg: 12px;

  /* Typography */
  --font-sans: "Segoe UI", system-ui, -apple-system, sans-serif;
}

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

html, body {
  height: 100%;
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 400;
  line-height: 1.6;
  color: var(--color-text-primary);
  background: var(--color-background-tertiary);
}

/* ── App shell ────────────────────────────────────────────── */
.app-shell {
  display: flex;
  flex-direction: column;
  height: 100vh;
}

/* ── Nav sections (tab rows) ─────────────────────────────── */
.nav-section {
  background: var(--color-background-primary);
  border-bottom: 0.5px solid var(--color-border-tertiary);
}

.nav-label {
  display: block;
  font-size: 11px;
  font-weight: 500;
  text-transform: uppercase;
  color: var(--color-text-secondary);
  padding: 8px 16px 0 16px;
  user-select: none;
}

.tab-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 8px 16px;
}

/* ── Tab buttons ─────────────────────────────────────────── */
.tab-btn {
  padding: 8px 12px;
  border: none;
  border-radius: var(--border-radius-md);
  background: transparent;
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 400;
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
  white-space: nowrap;
}

.tab-btn:hover {
  background: var(--color-background-secondary);
  color: var(--color-text-primary);
}

.tab-btn.active {
  background: var(--color-background-info);
  color: var(--color-text-info);
}

/* ── Main content area ───────────────────────────────────── */
#main-content {
  flex: 1;
  overflow-y: auto;
  background: var(--color-background-secondary);
  padding: 24px;
}

/* ── Panel card ──────────────────────────────────────────── */
.panel-card {
  background: var(--color-background-primary);
  border: 0.5px solid var(--color-border-tertiary);
  border-radius: var(--border-radius-lg);
  padding: 24px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
  margin-left: auto;
  margin-right: auto;
}

.panel-card h2 {
  font-size: 18px;
  font-weight: 500;
  margin: 0 0 12px;
}

.panel-card p {
  font-size: 14px;
  font-weight: 400;
  line-height: 1.6;
  color: var(--color-text-secondary);
}

/* ── Footer ──────────────────────────────────────────────── */
.app-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--color-background-primary);
  border-top: 0.5px solid var(--color-border-tertiary);
  padding: 16px 24px;
}

.footer-right {
  display: flex;
  gap: 12px;
}

/* ── Footer buttons ──────────────────────────────────────── */
.btn {
  padding: 8px 16px;
  border: 0.5px solid var(--color-border-secondary);
  border-radius: var(--border-radius-md);
  background: transparent;
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 400;
  color: var(--color-text-primary);
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
}

.btn:hover {
  background: var(--color-background-secondary);
  border-color: var(--color-border-primary);
}

.btn:active {
  transform: scale(0.98);
}

.btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  pointer-events: none;
}

/* ── Field error slot (used by panels later) ─────────────── */
.field-error {
  min-height: 14px;
  font-size: 10px;
  line-height: 1.3;
}

.field-warning {
  color: var(--color-warning);
}

.hx-rb-info {
  font-size: 11px;
  line-height: 1.3;
  min-height: 14px;
}

.hx-rb-info-ok {
  color: var(--color-text-secondary);
}

.field-danger {
  color: var(--color-danger);
}

/* ── Panel: Project metadata ─────────────────────────────── */
.proj-panel {
  max-width: 640px;
}

.proj-field {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-bottom: 24px;
}

.proj-field:last-child {
  margin-bottom: 0;
}

.proj-label {
  font-size: 14px;
  font-weight: 400;
  color: var(--color-text-secondary);
}

.proj-input {
  padding: 8px 12px;
  border: 0.5px solid var(--color-border-tertiary);
  border-radius: var(--border-radius-md);
  font-family: var(--font-sans);
  font-size: 14px;
  color: var(--color-text-primary);
  background: var(--color-background-primary);
  transition: border-color 0.15s;
}

.proj-input:focus {
  outline: none;
  border-color: var(--color-text-info);
  box-shadow: 0 0 0 2px rgba(24, 95, 165, 0.3);
}

.proj-dates {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  background: var(--color-background-secondary);
  border-radius: var(--border-radius-md);
  padding: 16px;
  margin-bottom: 24px;
}

.proj-date-cell {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.proj-date-label {
  font-size: 14px;
  color: var(--color-text-secondary);
}

.proj-date-value {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--color-text-primary);
}

.proj-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

.proj-dot--neutral {
  background: var(--color-text-tertiary);
}

.proj-dot--teal {
  background: #0d9488;
}

.proj-textarea {
  padding: 8px 12px;
  border: 0.5px solid var(--color-border-tertiary);
  border-radius: var(--border-radius-md);
  font-family: var(--font-sans);
  font-size: 14px;
  color: var(--color-text-primary);
  background: var(--color-background-primary);
  height: 180px;
  resize: vertical;
  line-height: 1.6;
  transition: border-color 0.15s;
}

.proj-textarea:focus {
  outline: none;
  border-color: var(--color-text-info);
  box-shadow: 0 0 0 2px rgba(24, 95, 165, 0.3);
}

/* ── Panel: Ground ───────────────────────────────────────── */
.gnd-panel {
  max-width: 640px;
}

.gnd-municipality-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 24px;
}

.gnd-select {
  width: 200px;
  padding: 8px 12px;
  border: 0.5px solid var(--color-border-tertiary);
  border-radius: var(--border-radius-md);
  font-family: var(--font-sans);
  font-size: 14px;
  color: var(--color-text-primary);
  background: var(--color-background-primary);
  transition: border-color 0.15s;
}

.gnd-select:focus {
  outline: none;
  border-color: var(--color-text-info);
  box-shadow: 0 0 0 2px rgba(24, 95, 165, 0.3);
}

.gnd-group {
  border: 0.5px solid var(--color-border-tertiary);
  border-radius: var(--border-radius-md);
  padding: 24px 16px 16px;
  margin-bottom: 24px;
}

.gnd-group:last-child {
  margin-bottom: 0;
}

.gnd-group-legend {
  font-size: 11px;
  font-weight: 500;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  padding: 0 8px;
}

.gnd-field-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 8px;
}

.gnd-field-row:first-child {
  margin-top: 0;
}

.gnd-field-label {
  width: 250px;
  text-align: right;
  font-size: 14px;
  color: var(--color-text-primary);
  flex-shrink: 0;
}

.gnd-field-input {
  width: 120px;
  padding: 8px 8px;
  border: 0.5px solid var(--color-border-tertiary);
  border-radius: var(--border-radius-md);
  font-family: var(--font-sans);
  font-size: 14px;
  color: var(--color-text-primary);
  background: var(--color-background-primary);
  text-align: right;
  transition: border-color 0.15s;
}

.gnd-field-input:focus {
  outline: none;
  border-color: var(--color-text-info);
  box-shadow: 0 0 0 2px rgba(24, 95, 165, 0.3);
}

.gnd-field-input.input-invalid {
  border-color: var(--color-danger);
}

.gnd-field-input.input-invalid:focus {
  box-shadow: 0 0 0 2px rgba(220, 38, 38, 0.15);
}

.gnd-field-unit {
  min-width: 52px;
  font-size: 14px;
  color: var(--color-text-secondary);
  flex-shrink: 0;
}

.gnd-field-row + .field-error {
  padding-left: 258px;
}

.gnd-mode-row {
  display: flex;
  gap: 24px;
  padding: 8px 0;
  margin-left: 258px;
}

.gnd-radio-label {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 14px;
  cursor: pointer;
}

/* ── Panel: Heat Exchanger ───────────────────────────────── */
.hx-panel {
  max-width: 860px;
}

.hx-columns {
  display: grid;
  grid-template-columns: minmax(0, 57fr) minmax(0, 41fr);
  gap: 2%;
}

.hx-left {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.hx-right {
  position: sticky;
  top: 0;
  align-self: start;
}

.hx-group {
  border: 0.5px solid var(--color-border-tertiary);
  border-radius: var(--border-radius-md);
  padding: 24px 16px 16px;
}

.hx-group-legend {
  font-size: 11px;
  font-weight: 500;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  padding: 0 8px;
}

.hx-field-row {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-top: 8px;
}

.hx-field-row:first-child,
.hx-field-row:first-of-type {
  margin-top: 0;
}

.hx-field-label {
  width: 152px;
  text-align: right;
  font-size: 14px;
  color: var(--color-text-primary);
  flex-shrink: 0;
}

.hx-field-input {
  width: 80px;
  padding: 6px 8px;
  border: 0.5px solid var(--color-border-tertiary);
  border-radius: var(--border-radius-md);
  font-family: var(--font-sans);
  font-size: 14px;
  color: var(--color-text-primary);
  background: var(--color-background-primary);
  text-align: right;
  transition: border-color 0.15s;
}

.hx-field-input:focus {
  outline: none;
  border-color: var(--color-text-info);
  box-shadow: 0 0 0 2px rgba(24, 95, 165, 0.3);
}

.hx-field-input.input-invalid {
  border-color: var(--color-danger);
}

.hx-field-input.input-invalid:focus {
  box-shadow: 0 0 0 2px rgba(220, 38, 38, 0.15);
}

.hx-field-unit {
  min-width: 52px;
  font-size: 14px;
  color: var(--color-text-secondary);
  flex-shrink: 0;
}

.hx-select {
  width: 120px;
  padding: 8px 12px;
  border: 0.5px solid var(--color-border-tertiary);
  border-radius: var(--border-radius-md);
  font-family: var(--font-sans);
  font-size: 14px;
  color: var(--color-text-primary);
  background: var(--color-background-primary);
  transition: border-color 0.15s;
}

.hx-select:focus {
  outline: none;
  border-color: var(--color-text-info);
  box-shadow: 0 0 0 2px rgba(24, 95, 165, 0.3);
}

.hx-select-wide {
  flex: 1;
  width: auto;
  padding: 8px 12px;
  border: 0.5px solid var(--color-border-tertiary);
  border-radius: var(--border-radius-md);
  font-family: var(--font-sans);
  font-size: 14px;
  color: var(--color-text-primary);
  background: var(--color-background-primary);
  transition: border-color 0.15s;
}

.hx-select-wide:focus {
  outline: none;
  border-color: var(--color-text-info);
  box-shadow: 0 0 0 2px rgba(24, 95, 165, 0.3);
}

.hx-field-row + .field-error {
  padding-left: 156px;
}

.hx-mode-row {
  display: flex;
  justify-content: center;
  gap: 24px;
  padding: 8px 0;
}

.hx-radio-label {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 14px;
  cursor: pointer;
  white-space: nowrap;
}

/* SVG box */
.hx-svg-box {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 16px;
  border: 0.5px solid var(--color-border-tertiary);
  border-radius: var(--border-radius-md);
  background: var(--color-background-primary);
}

.hx-svg {
  width: 100%;
  max-width: 260px;
  height: auto;
}

.hx-svg-status {
  font-size: 12px;
  text-align: center;
}

.hx-svg-status--success { color: var(--color-success); }
.hx-svg-status--danger  { color: var(--color-danger); }

/* ── Panel: Borehole Field ──────────────────────────────── */
.bf-panel {
  max-width: 860px;
}

.bf-columns {
  display: grid;
  grid-template-columns: minmax(0, 57fr) minmax(0, 41fr);
  gap: 2%;
}

.bf-left {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.bf-right {
  position: sticky;
  top: 0;
  align-self: start;
}

.bf-group {
  border: 0.5px solid var(--color-border-tertiary);
  border-radius: var(--border-radius-md);
  padding: 24px 16px 16px;
}

.bf-group-legend {
  font-size: 11px;
  font-weight: 500;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  padding: 0 8px;
}

.bf-field-row {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-top: 8px;
}

.bf-field-row:first-child,
.bf-field-row:first-of-type {
  margin-top: 0;
}

.bf-field-label {
  width: 152px;
  text-align: right;
  font-size: 14px;
  color: var(--color-text-primary);
  flex-shrink: 0;
}

.bf-field-input {
  width: 80px;
  padding: 6px 8px;
  border: 0.5px solid var(--color-border-tertiary);
  border-radius: var(--border-radius-md);
  font-family: var(--font-sans);
  font-size: 14px;
  color: var(--color-text-primary);
  background: var(--color-background-primary);
  text-align: right;
  transition: border-color 0.15s;
}

.bf-field-input:focus {
  outline: none;
  border-color: var(--color-text-info);
  box-shadow: 0 0 0 2px rgba(24, 95, 165, 0.3);
}

.bf-field-input.input-invalid {
  border-color: var(--color-danger);
}

.bf-field-input.input-invalid:focus {
  box-shadow: 0 0 0 2px rgba(220, 38, 38, 0.15);
}

.bf-field-unit {
  min-width: 52px;
  font-size: 14px;
  color: var(--color-text-secondary);
  flex-shrink: 0;
}

.bf-select-wide {
  flex: 1;
  width: auto;
  padding: 8px 12px;
  border: 0.5px solid var(--color-border-tertiary);
  border-radius: var(--border-radius-md);
  font-family: var(--font-sans);
  font-size: 14px;
  color: var(--color-text-primary);
  background: var(--color-background-primary);
  transition: border-color 0.15s;
}

.bf-select-wide:focus {
  outline: none;
  border-color: var(--color-text-info);
  box-shadow: 0 0 0 2px rgba(24, 95, 165, 0.3);
}

.bf-field-row + .field-error {
  padding-left: 156px;
}

.bf-mode-row {
  display: flex;
  justify-content: center;
  gap: 24px;
  padding: 8px 0;
}

.bf-radio-label {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 14px;
  cursor: pointer;
  white-space: nowrap;
}

.bf-readonly {
  background: var(--color-background-secondary);
  cursor: default;
}

.bf-re-warning {
  background: rgba(217, 119, 6, 0.12);
  color: var(--color-warning);
}

/* SVG box */
.bf-svg-box {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 16px;
  border: 0.5px solid var(--color-border-tertiary);
  border-radius: var(--border-radius-md);
  background: var(--color-background-primary);
}

.bf-svg-header {
  font-size: 12px;
  color: var(--color-text-secondary);
  text-align: center;
}

.bf-svg {
  width: 280px;
  height: 420px;
}

.bf-svg-placeholder {
  font-size: 24px;
  color: var(--color-text-tertiary);
  padding: 40px 0;
}

/* ── Panel: Working Fluid ─────────────────────────────────── */
.wf-panel {
  max-width: 640px;
}

.wf-group {
  border: 0.5px solid var(--color-border-tertiary);
  border-radius: var(--border-radius-md);
  padding: 24px 16px 16px;
  margin-bottom: 24px;
}

.wf-group:last-child {
  margin-bottom: 0;
}

.wf-group-legend {
  font-size: 11px;
  font-weight: 500;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  padding: 0 8px;
}

.wf-field-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 8px;
}

.wf-field-row:first-child,
.wf-field-row:first-of-type {
  margin-top: 0;
}

.wf-field-label {
  width: 175px;
  text-align: right;
  font-size: 14px;
  color: var(--color-text-primary);
  flex-shrink: 0;
}

.wf-field-input {
  width: 80px;
  padding: 6px 8px;
  border: 0.5px solid var(--color-border-tertiary);
  border-radius: var(--border-radius-md);
  font-family: var(--font-sans);
  font-size: 14px;
  color: var(--color-text-primary);
  background: var(--color-background-primary);
  text-align: right;
  transition: border-color 0.15s;
}

.wf-field-input:focus {
  outline: none;
  border-color: var(--color-text-info);
  box-shadow: 0 0 0 2px rgba(24, 95, 165, 0.3);
}

.wf-field-input.input-invalid {
  border-color: var(--color-danger);
}

.wf-field-input.input-invalid:focus {
  box-shadow: 0 0 0 2px rgba(220, 38, 38, 0.15);
}

.wf-field-unit {
  min-width: 68px;
  font-size: 14px;
  color: var(--color-text-secondary);
  flex-shrink: 0;
}

.wf-select {
  width: 220px;
  padding: 8px 12px;
  border: 0.5px solid var(--color-border-tertiary);
  border-radius: var(--border-radius-md);
  font-family: var(--font-sans);
  font-size: 14px;
  color: var(--color-text-primary);
  background: var(--color-background-primary);
  transition: border-color 0.15s;
}

.wf-select:focus {
  outline: none;
  border-color: var(--color-text-info);
  box-shadow: 0 0 0 2px rgba(24, 95, 165, 0.3);
}

.wf-field-row + .field-error {
  padding-left: 183px;
}

.wf-readonly {
  background: var(--color-background-secondary);
  cursor: default;
}

.wf-separator {
  border: none;
  border-top: 0.5px solid var(--color-border-tertiary);
  margin: 12px 0;
}

/* ── Locked fields ───────────────────────────────────────── */
.locked {
  opacity: 0.42;
  pointer-events: none;
}

/* ── Panel: Building Loads ───────────────────────────────── */
.bl-panel {
  max-width: 860px;
}

.bl-columns {
  display: grid;
  grid-template-columns: minmax(0, 58fr) minmax(0, 40fr);
  gap: 24px;
}

.bl-left {
  display: flex;
  flex-direction: column;
  gap: 24px;
  min-width: 0;
}

.bl-right {
  position: sticky;
  top: 0;
  align-self: start;
}

.bl-group {
  border: 0.5px solid var(--color-border-tertiary);
  border-radius: var(--border-radius-md);
  padding: 24px 16px 16px;
}

.bl-group-legend {
  font-size: 11px;
  font-weight: 500;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  padding: 0 8px;
}

/* SPF row */
.bl-spf-row {
  display: flex;
  align-items: flex-start;
  gap: 16px;
}

.bl-spf-label {
  width: 40px;
  flex-shrink: 0;
  font-size: 14px;
  color: var(--color-text-secondary);
  padding-top: 22px;
}

.bl-spf-col {
  display: flex;
  flex-direction: column;
}

.bl-spf-col-label {
  font-size: 12px;
  color: var(--color-text-secondary);
  margin-bottom: 4px;
}

.bl-spf-input {
  width: 90px;
  padding: 6px 8px;
  border: 0.5px solid var(--color-border-tertiary);
  border-radius: var(--border-radius-md);
  font-family: var(--font-sans);
  font-size: 14px;
  color: var(--color-text-primary);
  background: var(--color-background-primary);
  text-align: right;
  transition: border-color 0.15s;
}

.bl-spf-input:focus {
  outline: none;
  border-color: var(--color-text-info);
  box-shadow: 0 0 0 2px rgba(24, 95, 165, 0.3);
}

.bl-spf-input.input-invalid {
  border-color: var(--color-danger);
}

.bl-spf-input.input-invalid:focus {
  box-shadow: 0 0 0 2px rgba(220, 38, 38, 0.15);
}

/* Passive cooling toggle */
.bl-passive-section {
  margin-top: 8px;
}

.bl-passive-label {
  font-size: 12px;
  color: var(--color-text-secondary);
  margin-bottom: 4px;
}

.bl-toggle-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

.bl-toggle {
  position: relative;
  width: 36px;
  height: 20px;
  flex-shrink: 0;
}

.bl-toggle input {
  opacity: 0;
  width: 0;
  height: 0;
}

.bl-toggle-slider {
  position: absolute;
  cursor: pointer;
  top: 0; left: 0; right: 0; bottom: 0;
  background: var(--color-border-secondary);
  border-radius: 10px;
  transition: background 0.2s;
}

.bl-toggle-slider::before {
  content: "";
  position: absolute;
  width: 16px;
  height: 16px;
  left: 2px;
  bottom: 2px;
  background: white;
  border-radius: 50%;
  transition: transform 0.2s;
}

.bl-toggle input:checked + .bl-toggle-slider {
  background: #378ADD;
}

.bl-toggle input:checked + .bl-toggle-slider::before {
  transform: translateX(16px);
}

.bl-toggle-text {
  font-size: 12px;
  color: var(--color-text-secondary);
}

/* Mode radio column */
.bl-mode-col {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 8px 0 16px;
}

.bl-radio-label {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 13px;
  cursor: pointer;
}

/* Annual loads sub-group */
.bl-annual-group {
  border: 0.5px solid var(--color-border-tertiary);
  border-radius: var(--border-radius-md);
  padding: 20px 16px 12px;
  margin-bottom: 16px;
}

.bl-annual-group-legend {
  font-size: 11px;
  font-weight: 500;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  padding: 0 8px;
}

.bl-annual-row {
  display: flex;
  align-items: flex-start;
  gap: 16px;
}

.bl-annual-col {
  display: flex;
  flex-direction: column;
}

.bl-annual-col-label {
  font-size: 12px;
  color: var(--color-text-secondary);
  margin-bottom: 4px;
}

.bl-annual-input {
  width: 90px;
  padding: 6px 8px;
  border: 0.5px solid var(--color-border-tertiary);
  border-radius: var(--border-radius-md);
  font-family: var(--font-sans);
  font-size: 14px;
  color: var(--color-text-primary);
  background: var(--color-background-primary);
  text-align: right;
  transition: border-color 0.15s;
}

.bl-annual-input:focus {
  outline: none;
  border-color: var(--color-text-info);
  box-shadow: 0 0 0 2px rgba(24, 95, 165, 0.3);
}

.bl-annual-input.input-invalid {
  border-color: var(--color-danger);
}

.bl-annual-input.input-invalid:focus {
  box-shadow: 0 0 0 2px rgba(220, 38, 38, 0.15);
}

.bl-annual-unit {
  font-size: 14px;
  color: var(--color-text-secondary);
  padding-top: 22px;
}

/* Monthly table */
.bl-table-wrap {
  margin-top: 16px;
  overflow-x: auto;
}

.bl-table {
  width: 100%;
  table-layout: fixed;
  border-collapse: collapse;
  font-size: 13px;
}

.bl-table th {
  font-size: 11px;
  font-weight: 500;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.3px;
  padding: 6px 4px;
  text-align: right;
  border-bottom: none;
}

.bl-table th.bl-th-building {
  background: rgba(217, 119, 6, 0.08);
}

.bl-table th.bl-th-ground {
  background: rgba(22, 163, 74, 0.08);
}

.bl-table th.bl-th-unit {
  font-size: 10px;
  font-weight: 400;
  text-transform: none;
  padding-top: 0;
  border-bottom: 1px solid var(--color-border-tertiary);
}

.bl-table td {
  padding: 3px 2px;
  text-align: center;
  vertical-align: middle;
}

.bl-table td.bl-td-month {
  font-size: 12px;
  color: var(--color-text-secondary);
  text-align: left;
  padding-left: 4px;
}

.bl-table td.bl-td-building {
  background: rgba(217, 119, 6, 0.08);
}

.bl-table td.bl-td-ground {
  background: rgba(22, 163, 74, 0.08);
  color: var(--color-text-secondary);
}

.bl-table-input {
  width: 100%;
  display: block;
  box-sizing: border-box;
  padding: 4px 4px;
  border: 0.5px solid var(--color-border-tertiary);
  border-radius: 4px;
  font-family: var(--font-sans);
  font-size: 13px;
  color: var(--color-text-primary);
  background: var(--color-background-primary);
  text-align: right;
  transition: border-color 0.15s;
}

.bl-table-input:focus {
  outline: none;
  border-color: var(--color-text-info);
  box-shadow: 0 0 0 1px rgba(24, 95, 165, 0.3);
}

.bl-table-input.input-invalid {
  border-color: var(--color-danger);
}

.bl-table-input.bl-table-readonly {
  background: var(--color-background-secondary);
  color: var(--color-text-secondary);
  pointer-events: none;
}

.bl-table .bl-total-row td {
  font-weight: 500;
  border-top: 1px solid var(--color-border-secondary);
  padding: 6px 4px;
  font-size: 13px;
  text-align: right;
}

.bl-total-danger {
  color: var(--color-danger);
  font-weight: 600;
}

.bl-total-warning {
  color: var(--color-warning);
  font-weight: 600;
}

.bl-net-negative {
  color: var(--color-warning);
}

/* Chart container */
.bl-chart-box {
  border: 0.5px solid var(--color-border-tertiary);
  border-radius: var(--border-radius-md);
  background: var(--color-background-primary);
  padding: 16px;
}

.bl-chart-title {
  font-size: 11px;
  font-weight: 500;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 8px;
}

.bl-chart-container {
  position: relative;
  height: 320px;
}

/* ── Panel: Calculation Parameters ──────────────────────── */
.cp-panel {
  max-width: 640px;
}

.cp-group {
  border: 0.5px solid var(--color-border-tertiary);
  border-radius: var(--border-radius-md);
  padding: 24px 16px 16px;
  margin-bottom: 24px;
}

.cp-group:last-child {
  margin-bottom: 0;
}

.cp-group-legend {
  font-size: 11px;
  font-weight: 500;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  padding: 0 8px;
}

.cp-field-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 8px;
}

.cp-field-row:first-child {
  margin-top: 0;
}

.cp-field-label {
  width: 250px;
  text-align: right;
  font-size: 14px;
  color: var(--color-text-primary);
  flex-shrink: 0;
}

.cp-field-input {
  width: 120px;
  padding: 8px 8px;
  border: 0.5px solid var(--color-border-tertiary);
  border-radius: var(--border-radius-md);
  font-family: var(--font-sans);
  font-size: 14px;
  color: var(--color-text-primary);
  background: var(--color-background-primary);
  text-align: right;
  transition: border-color 0.15s;
}

.cp-field-input:focus {
  outline: none;
  border-color: var(--color-text-info);
  box-shadow: 0 0 0 2px rgba(24, 95, 165, 0.3);
}

.cp-field-input.input-invalid {
  border-color: var(--color-danger);
}

.cp-field-input.input-invalid:focus {
  box-shadow: 0 0 0 2px rgba(220, 38, 38, 0.15);
}

.cp-field-unit {
  min-width: 52px;
  font-size: 14px;
  color: var(--color-text-secondary);
}

.cp-select {
  width: 160px;
  text-align: left;
}

.cp-cross-error {
  margin-left: 258px;
}

/* ── Modal dialog ────────────────────────────────────────── */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 1000;
  background: rgba(0, 0, 0, 0.45);
  display: flex;
  align-items: center;
  justify-content: center;
}

.modal-dialog {
  background: var(--color-background-primary);
  border-radius: var(--border-radius-lg);
  padding: 24px;
  max-width: 480px;
  width: 90%;
  max-height: 70vh;
  overflow-y: auto;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
}

.modal-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-danger);
  margin-bottom: 12px;
}

.modal-error-list {
  list-style: disc;
  padding-left: 20px;
  margin-bottom: 16px;
  font-size: 13px;
  color: var(--color-text-primary);
  line-height: 1.7;
}

.modal-close-btn {
  display: block;
  margin-left: auto;
}

/* ── Primary button (Calculate) ───────────────────────────── */
.btn-primary {
  background: var(--color-background-info);
  color: var(--color-text-info);
  border-color: var(--color-border-info);
  font-weight: 500;
}

.btn-primary:hover {
  background: rgba(24, 95, 165, 0.18);
  border-color: var(--color-text-info);
  color: var(--color-text-info);
}

.btn-primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* ── Panel: Fluid Temperature ─────────────────────────────── */
.ft-panel {
  max-width: 900px;
  display: flex;
  flex-direction: column;
}

.ft-controls {
  margin-bottom: 12px;
}

.ft-toggle-row {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  align-items: center;
  padding: 10px 0;
  border-top: 0.5px solid var(--color-border-tertiary);
  border-bottom: 0.5px solid var(--color-border-tertiary);
  margin-bottom: 12px;
}

.ft-toggle-item {
  display: flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  user-select: none;
}

.ft-toggle-item input[type="checkbox"] {
  width: 14px;
  height: 14px;
  cursor: pointer;
  flex-shrink: 0;
}

.ft-toggle-label {
  font-size: 13px;
  font-weight: 500;
}

/* Chart area */
.ft-chart-wrap {
  position: relative;
  height: 520px;
}

#bd-chart-wrap {
  height: 390px;
}

.ft-chart-wrap canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100% !important;
  height: 100% !important;
}

.ft-empty-state {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-tertiary);
  font-size: 14px;
  pointer-events: none;
}

.ft-stale-overlay {
  position: absolute;
  inset: 0;
  background: rgba(255, 255, 255, 0.82);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  color: var(--color-warning);
  font-weight: 500;
  pointer-events: none;
  border-radius: var(--border-radius-md);
}

.ft-status-bar {
  margin-top: 8px;
  min-height: 18px;
}