/* =========================================
   WELDCALC — style.css
   Weld Parameter Calculator
   Design system: white cards, #061d33 text,
   #ff9901 accent — DM Sans + IBM Plex Mono
   ========================================= */

:root {
  --primary:        #ff9901;
  --primary-hover:  #e68a00;
  --primary-light:  #fff7e6;
  --dark:           #061d33;
  --mid:            #4a5568;
  --muted:          #9ca3af;
  --border:         #e2e8f0;
  --bg:             #f7f8fa;
  --white:          #ffffff;
  --radius:         10px;
  --radius-sm:      6px;
  --shadow:         0 4px 10px rgba(0,0,0,0.08);
  --shadow-md:      0 8px 24px rgba(0,0,0,0.12);
  --font-body:      'DM Sans', sans-serif;
  --font-mono:      'IBM Plex Mono', monospace;
}

/* ---- APP WRAPPER ---- */
.weldcalc-app {
  width: 100%;
  margin-bottom: 40px;
}

.weldcalc-app .app-container.weldcalc-container {
  max-width: 100%;
  padding: 0;
  background: transparent;
  border-radius: 0;
  box-shadow: none;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  overflow: visible;
}

/* ---- PANELS ---- */
.wc-panel {
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px 22px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.wc-panel-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
  color: var(--dark);
}

.wc-panel-header h2 {
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 700;
  color: var(--dark);
  margin: 0;
}

/* ---- FIELDS ---- */
.wc-field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.wc-field label {
  font-family: var(--font-body);
  font-size: 12px;
  font-weight: 600;
  color: var(--dark);
}

.wc-req { color: var(--primary); }

.wc-field select {
  font-family: var(--font-body);
  font-size: 16px;
  color: var(--dark);
  background: var(--white);
  border: 1.5px solid #d1d5db;
  border-radius: var(--radius-sm);
  padding: 9px 30px 9px 11px;
  outline: none;
  cursor: pointer;
  appearance: none;
  background-image: url('data:image/svg+xml,%3Csvg xmlns=%22http://www.w3.org/2000/svg%22 width=%2212%22 height=%2212%22 viewBox=%220 0 12 12%22%3E%3Cpath fill=%22%239ca3af%22 d=%22M2 4l4 4 4-4z%22/%3E%3C/svg%3E');
  background-repeat: no-repeat;
  background-position: right 10px center;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.wc-field select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(255,153,1,0.15);
}

/* Process toggle buttons */
.wc-process-btns {
  display: flex;
  gap: 0;
  border-radius: var(--radius-sm);
  overflow: hidden;
  border: 1.5px solid #d1d5db;
}

.wc-proc-btn {
  flex: 1;
  font-family: var(--font-body);
  font-size: 12px;
  font-weight: 600;
  padding: 9px 8px;
  border: none;
  background: var(--white);
  color: var(--mid);
  cursor: pointer;
  transition: all 0.15s;
  text-align: center;
  position: relative;
}

.wc-proc-btn + .wc-proc-btn {
  border-left: 1px solid #d1d5db;
}

.wc-proc-btn:hover {
  background: var(--bg);
}

.wc-proc-btn.active {
  background: var(--primary);
  color: var(--white);
  border-color: var(--primary);
}

.wc-proc-btn.active + .wc-proc-btn {
  border-left-color: var(--primary);
}

/* Thickness row with unit toggle */
.wc-thickness-wrap {
  display: flex;
  gap: 8px;
  align-items: stretch;
}

.wc-thickness-wrap select {
  flex: 1;
  font-family: var(--font-body);
  font-size: 16px;
  color: var(--dark);
  background: var(--white);
  border: 1.5px solid #d1d5db;
  border-radius: var(--radius-sm);
  padding: 9px 30px 9px 11px;
  outline: none;
  cursor: pointer;
  appearance: none;
  background-image: url('data:image/svg+xml,%3Csvg xmlns=%22http://www.w3.org/2000/svg%22 width=%2212%22 height=%2212%22 viewBox=%220 0 12 12%22%3E%3Cpath fill=%22%239ca3af%22 d=%22M2 4l4 4 4-4z%22/%3E%3C/svg%3E');
  background-repeat: no-repeat;
  background-position: right 10px center;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.wc-thickness-wrap select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(255,153,1,0.15);
}

.wc-unit-toggle {
  display: flex;
  border-radius: var(--radius-sm);
  overflow: hidden;
  border: 1.5px solid #d1d5db;
  flex-shrink: 0;
}

.wc-unit-btn {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  padding: 8px 12px;
  border: none;
  background: var(--white);
  color: var(--mid);
  cursor: pointer;
  transition: all 0.15s;
}

.wc-unit-btn + .wc-unit-btn {
  border-left: 1px solid #d1d5db;
}

.wc-unit-btn.active {
  background: var(--dark);
  color: var(--white);
}

/* Calculate button */
.wc-calc-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 700;
  background: var(--primary);
  color: var(--white);
  border: none;
  border-radius: var(--radius-sm);
  padding: 12px 20px;
  cursor: pointer;
  transition: background 0.15s, transform 0.1s;
  margin-top: 4px;
}

.wc-calc-btn:hover { background: var(--primary-hover); }
.wc-calc-btn:active { transform: scale(0.98); }

/* ---- RESULTS PANEL ---- */
.wc-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 40px 20px;
  text-align: center;
  flex: 1;
}

.wc-empty svg { margin-bottom: 14px; opacity: 0.5; }

.wc-empty-title {
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 700;
  color: var(--dark);
  margin: 0 0 6px;
}

.wc-empty-sub {
  font-family: var(--font-body);
  font-size: 13px;
  color: var(--muted);
  margin: 0;
  max-width: 260px;
  line-height: 1.5;
}

/* Results Content */
.wc-results-content {
  display: flex;
  flex-direction: column;
  gap: 16px;
  animation: wc-fadeIn 0.3s ease;
}

@keyframes wc-fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* Tags row */
.wc-result-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
}

.wc-rtag {
  font-family: var(--font-body);
  font-size: 10px;
  font-weight: 600;
  padding: 3px 9px;
  border-radius: 20px;
  white-space: nowrap;
  display: inline-flex;
  align-items: center;
  line-height: 1;
}

.wc-rtag-process { background: #ede9fe; color: #7c3aed; }
.wc-rtag-material { background: #dbeafe; color: #2563eb; }
.wc-rtag-joint { background: #d1fae5; color: #059669; }
.wc-rtag-position { background: #fef3c7; color: #d97706; }

/* Metrics grid */
.wc-metrics {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.wc-metric {
  background: var(--bg);
  border-radius: var(--radius-sm);
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  border: 1px solid var(--border);
}

.wc-metric-label {
  font-family: var(--font-body);
  font-size: 10px;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  display: flex;
  align-items: center;
  gap: 5px;
}

.wc-metric-value {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  color: var(--dark);
  line-height: 1.1;
}

.wc-metric-unit {
  font-family: var(--font-body);
  font-size: 11px;
  color: var(--mid);
  font-weight: 500;
}

.wc-metric-icon {
  width: 14px;
  height: 14px;
  flex-shrink: 0;
}

/* Extra details section */
.wc-extra {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.wc-extra-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 12px;
  background: var(--bg);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}

.wc-extra-label {
  font-family: var(--font-body);
  font-size: 12px;
  color: var(--mid);
  font-weight: 500;
}

.wc-extra-value {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--dark);
  font-weight: 600;
}

/* Notes */
.wc-notes {
  background: var(--primary-light);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  border-left: 3px solid var(--primary);
}

.wc-notes-title {
  font-family: var(--font-body);
  font-size: 11px;
  font-weight: 700;
  color: var(--dark);
  margin: 0 0 6px;
  display: flex;
  align-items: center;
  gap: 5px;
}

.wc-notes ul {
  margin: 0;
  padding-left: 16px;
  list-style-type: disc;
}

.wc-notes li {
  font-family: var(--font-body);
  font-size: 11px;
  color: var(--mid);
  line-height: 1.6;
}

/* ---- DISCLAIMER ---- */
.wc-disclaimer {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  margin-top: 16px;
  padding: 12px 16px;
  background: var(--bg);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}

.wc-disclaimer svg {
  flex-shrink: 0;
  color: var(--muted);
  margin-top: 1px;
}

.wc-disclaimer span {
  font-family: var(--font-body);
  font-size: 11px;
  color: var(--mid);
  line-height: 1.6;
}

.wc-disclaimer strong {
  color: var(--dark);
}

/* ---- TOAST ---- */
.of-toast {
  position: fixed;
  bottom: 28px;
  left: 50%;
  transform: translateX(-50%) translateY(10px);
  background: var(--dark);
  color: var(--white);
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 500;
  padding: 10px 20px;
  border-radius: 8px;
  box-shadow: 0 4px 16px rgba(0,0,0,0.2);
  opacity: 0;
  transition: opacity 0.2s, transform 0.2s;
  pointer-events: none;
  z-index: 4000;
  white-space: nowrap;
}

.of-toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ---- RESPONSIVE ---- */
@media (max-width: 720px) {
  .weldcalc-app .app-container.weldcalc-container {
    grid-template-columns: 1fr;
  }
  .wc-metrics {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 420px) {
  .wc-proc-btn { font-size: 11px; padding: 8px 4px; }
  .wc-metrics { grid-template-columns: 1fr; }
  .wc-metric-value { font-size: 18px; }
}