:root {
  --blue: #0057c2;
  --blue-dark: #003d8f;
  --blue-soft: #eaf3ff;
  --green: #17823b;
  --orange: #b86b00;
  --text: #172033;
  --muted: #62708a;
  --border: #d8e1ef;
  --bg: #f3f6fb;
  --card: #ffffff;
  --shadow: 0 12px 30px rgba(20, 43, 82, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding-top: 82px;
  font-family: Arial, Helvetica, sans-serif;
  background: var(--bg);
  color: var(--text);
}

.topbar {
  height: 82px;
  background: rgba(255, 255, 255, 0.96);
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 28px;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  backdrop-filter: blur(10px);
}

.brand {
  display: flex;
  gap: 14px;
  align-items: center;
}

.brand-mark {
  width: 46px;
  height: 46px;
  border-radius: 14px;
  background: var(--blue);
  color: white;
  display: grid;
  place-items: center;
  font-weight: 800;
  letter-spacing: 0.5px;
}

.brand h1 {
  margin: 0;
  font-size: 28px;
  color: var(--blue);
}

.brand p {
  margin: 2px 0 0;
  color: var(--muted);
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}

.main-nav {
  display: flex;
  gap: 12px;
}

.main-nav a {
  text-decoration: none;
  color: var(--muted);
  padding: 12px 14px;
  border-radius: 10px;
  font-weight: 700;
}

.main-nav a.active,
.main-nav a:hover {
  color: var(--blue);
  background: var(--blue-soft);
}

.language-switcher {
  display: flex;
  gap: 6px;
  padding: 4px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: #f8fafc;
}

.language-btn {
  border: 0;
  border-radius: 999px;
  padding: 7px 10px;
  background: transparent;
  color: var(--muted);
  font-weight: 900;
  cursor: pointer;
  font-size: 12px;
}

.language-btn.active {
  background: var(--blue);
  color: #ffffff;
}

.language-btn:hover:not(.active) {
  background: var(--blue-soft);
  color: var(--blue);
}

.layout {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  padding: 18px;
}

.diagram-panel {
  grid-column: 1;
  grid-row: 1;
}

.input-panel {
  grid-column: 2;
  grid-row: 1;
}

.results-panel {
  grid-column: 3;
  grid-row: 1;
}

.panel {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 18px;
  box-shadow: var(--shadow);
  padding: 18px;
}

.panel-header {
  display: flex;
  gap: 10px;
  align-items: center;
  margin-bottom: 18px;
}

.panel-header h2 {
  margin: 0;
  font-size: 19px;
  color: var(--blue);
}

.icon {
  font-size: 22px;
}

.field {
  display: grid;
  gap: 7px;
  margin-bottom: 13px;
}

label {
  font-size: 13px;
  font-weight: 700;
  color: #24324b;
}

input,
select {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 12px;
  font-size: 14px;
  background: white;
  color: var(--text);
}

input:focus,
select:focus {
  outline: 2px solid rgba(0, 87, 194, 0.18);
  border-color: var(--blue);
}

.switch-row {
  grid-template-columns: 1fr auto;
  align-items: center;
}

.switch-group {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--muted);
}

.switch {
  position: relative;
  width: 46px;
  height: 24px;
  display: inline-block;
}

.switch input {
  display: none;
}

.slider {
  position: absolute;
  inset: 0;
  background: #b8c4d6;
  border-radius: 999px;
  cursor: pointer;
}

.slider::before {
  content: "";
  width: 18px;
  height: 18px;
  background: white;
  position: absolute;
  top: 3px;
  left: 3px;
  border-radius: 50%;
  transition: 0.2s;
}

.switch input:checked + .slider {
  background: var(--blue);
}

.switch input:checked + .slider::before {
  transform: translateX(22px);
}

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

.unit-toggle {
  display: flex;
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
}

.unit-btn {
  border: 0;
  background: white;
  padding: 0 13px;
  cursor: pointer;
  font-weight: 800;
  color: var(--muted);
}

.unit-btn.active {
  background: var(--blue-soft);
  color: var(--blue);
}

.actions {
  display: grid;
  grid-template-columns: 1fr 120px;
  gap: 10px;
  margin-top: 18px;
}

button {
  font-family: inherit;
}

.primary-btn,
.secondary-btn,
.download-btn {
  border: 0;
  border-radius: 10px;
  padding: 12px 14px;
  font-weight: 800;
  cursor: pointer;
}

.primary-btn {
  background: var(--blue);
  color: white;
}

.primary-btn:hover {
  background: var(--blue-dark);
}

.secondary-btn {
  background: white;
  color: var(--blue);
  border: 1px solid var(--blue);
}

.diagram-panel {
  min-height: auto;
}

.diagram-panel .diagram {
  flex-direction: column;
  min-height: 520px;
  gap: 12px;
}

.diagram-panel .motor,
.diagram-panel .gearbox {
  width: 170px;
  height: 90px;
  border-radius: 18px;
}

.diagram-panel .coupling {
  width: 130px;
  height: 55px;
}

.diagram-panel .shaft {
  width: 180px;
  height: 42px;
}

.diagram {
  min-height: 320px;
  border: 1px dashed #b8c4d6;
  border-radius: 18px;
  background: linear-gradient(180deg, #ffffff, #f7faff);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  padding: 24px;
}

.machine,
.coupling,
.shaft {
  border: 2px solid #2f4b6f;
  background: #e9eef6;
  color: #21324d;
  display: grid;
  place-items: center;
  text-align: center;
  font-weight: 800;
}

.motor {
  width: 140px;
  height: 100px;
  border-radius: 24px 10px 10px 24px;
}

.gearbox {
  width: 150px;
  height: 150px;
  border-radius: 18px;
}

.coupling {
  width: 70px;
  height: 80px;
  border-radius: 12px;
  font-size: 13px;
}

.shaft {
  width: 170px;
  height: 42px;
  border-radius: 999px;
  font-size: 13px;
}

.diagram-note,
.concept-box {
  margin-top: 18px;
  border-radius: 14px;
  border: 1px solid #b8d7ff;
  background: var(--blue-soft);
  padding: 14px;
  color: #064b9b;
  font-weight: 700;
}

.concept-box {
  background: #ffffff;
  color: var(--text);
  border-color: var(--border);
}

.concept-box h3 {
  margin: 0 0 8px;
  color: var(--blue);
}

.concept-box p {
  margin: 0;
  color: var(--muted);
  line-height: 1.5;
}

.result-card,
.ad-slot,
.support-box {
  border: 1px solid var(--border);
  border-radius: 15px;
  padding: 15px;
  margin-bottom: 14px;
  background: #ffffff;
}

.result-card h3,
.support-box h3 {
  margin: 0 0 12px;
  color: var(--blue);
}

.result-row {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  border-top: 1px solid #eef2f7;
  padding: 10px 0;
  font-size: 14px;
}

.result-row strong {
  text-align: right;
}

.warning {
  background: #fffaf0;
  border-color: #ffd99b;
}

.warning h3 {
  color: var(--orange);
}

.warning p,
.support-box p {
  margin: 0;
  color: var(--muted);
  line-height: 1.45;
}

.ad-slot {
  border: 1px dashed #77aef5;
  background: #f2f7ff;
  color: var(--blue);
  text-align: center;
  display: grid;
  gap: 4px;
}

.ad-slot span {
  font-weight: 900;
}

.ad-slot small {
  color: var(--muted);
}

.download-btn {
  width: 100%;
  transition: 0.15s ease;
  margin: 0 0 16px;
  font-size: 15px;
  background: #d71920;
  color: #ffffff;
  font-weight: 900;
  box-shadow: 0 6px 14px rgba(215, 25, 32, 0.24);
}

.download-btn:disabled {
  background: #d71920;
  color: #ffffff;
  cursor: not-allowed;
  opacity: 0.62;
  box-shadow: 0 6px 14px rgba(215, 25, 32, 0.16);
}

.download-btn:not(:disabled) {
  background: #d71920;
  color: #ffffff;
  cursor: pointer;
  opacity: 1;
  box-shadow: 0 8px 18px rgba(215, 25, 32, 0.32);
}

.download-btn:not(:disabled)::before {
  content: "📄 ";
}

.download-btn:not(:disabled):hover {
  background: #b9151b;
  transform: translateY(-1px);
}

.footer {
  padding: 18px 24px;
  color: var(--muted);
  display: grid;
  gap: 8px;
  font-size: 13px;
  border-top: 1px solid var(--border);
}

.footer-main,
.footer-legal {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  align-items: center;
  flex-wrap: wrap;
}

.footer-main span:first-child {
  font-weight: 800;
  color: var(--text);
}

.footer-legal nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.footer-legal a {
  color: var(--blue);
  text-decoration: none;
  font-weight: 800;
}

.footer-legal a:hover {
  text-decoration: underline;
}

@media (max-width: 760px) {
  .footer-main,
  .footer-legal {
    display: grid;
    gap: 8px;
  }

  .footer-legal nav {
    display: grid;
    gap: 6px;
  }
}

.alternatives-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.alternative-card {
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 13px;
  background: #ffffff;
}

.alternative-card.recommended {
  border: 2px solid var(--blue);
  background: #f7fbff;
}

.alternative-header {
  display: grid;
  gap: 4px;
  margin-bottom: 12px;
}

.alternative-header strong {
  font-size: 12px;
  color: var(--blue);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.alternative-header span {
  font-size: 15px;
  font-weight: 800;
  color: var(--text);
}

.alternative-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.alternative-grid div {
  border-top: 1px solid #eef2f7;
  padding-top: 8px;
}

.alternative-grid small {
  display: block;
  font-size: 11px;
  color: var(--muted);
  margin-bottom: 3px;
}

.alternative-grid strong {
  display: block;
  font-size: 13px;
  color: var(--text);
}

.muted {
  color: var(--muted);
  margin: 0;
  line-height: 1.45;
}

.warning-text {
  color: #9f4f00;
  font-weight: 700;
  margin: 0;
  line-height: 1.45;
}

.stage-badge {
  border: 1px solid #b8d7ff;
  background: var(--blue-soft);
  color: #064b9b;
  border-radius: 14px;
  padding: 12px;
  font-size: 14px;
  font-weight: 700;
  line-height: 1.45;
  margin-bottom: 16px;
}

.assistant-section {
  margin-bottom: 18px;
}

.assistant-section h3 {
  margin: 0 0 10px;
  color: var(--blue);
  font-size: 15px;
}

.config-options {
  display: grid;
  gap: 10px;
}

.option-card {
  width: 100%;
  border: 1px solid var(--border);
  background: #ffffff;
  color: var(--text);
  border-radius: 14px;
  padding: 13px;
  text-align: left;
  cursor: pointer;
  transition: 0.15s;
}

.option-card strong {
  display: block;
  color: var(--text);
  font-size: 14px;
  margin-bottom: 4px;
}

.option-card span {
  display: block;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.4;
}

.option-card:hover,
.option-card.active {
  border-color: var(--blue);
  background: #f7fbff;
  box-shadow: 0 0 0 2px rgba(0, 87, 194, 0.08);
}

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

.equipment-card {
  border: 1px solid var(--border);
  background: #ffffff;
  color: var(--text);
  border-radius: 12px;
  padding: 10px;
  font-size: 13px;
  font-weight: 800;
  cursor: pointer;
  text-align: center;
}

.equipment-card:hover,
.equipment-card.active {
  border-color: var(--blue);
  color: var(--blue);
  background: var(--blue-soft);
}

.technical-guidance {
  border: 1px solid #d8e1ef;
  border-radius: 14px;
  background: #ffffff;
  padding: 13px;
  color: var(--muted);
  line-height: 1.45;
  font-size: 14px;
}

.field-warning {
  display: none;
  margin: 0;
  border: 1px solid #ffb3b3;
  background: #fff1f1;
  color: #b00020;
  border-radius: 10px;
  padding: 10px 12px;
  font-size: 13px;
  line-height: 1.4;
  font-weight: 700;
}

.field-warning.show {
  display: block;
}

input.input-danger,
select.input-danger {
  border-color: #b00020;
  background: #fffafa;
}

input.input-danger:focus,
select.input-danger:focus {
  outline: 2px solid rgba(176, 0, 32, 0.18);
  border-color: #b00020;
}

.technical-note {
  border: 1px solid #b8d7ff;
  background: #f7fbff;
  color: #35506f;
  border-radius: 12px;
  padding: 11px 12px;
  font-size: 13px;
  line-height: 1.45;
  margin: 2px 0 14px;
}

.technical-note strong {
  color: var(--blue);
}

.field-warning + .field-warning {
  margin-top: 7px;
}

.field-suggestion {
  display: none;
  margin: 0;
  border: 1px solid #f0cf70;
  background: #fff8df;
  color: #7a5200;
  border-radius: 10px;
  padding: 9px 12px;
  font-size: 13px;
  line-height: 1.4;
  font-weight: 700;
}

.field-suggestion.show {
  display: block;
}

input.input-suggested:not(.input-danger) {
  border-color: #d39b00;
  background: #fffdf2;
}

input.input-suggested:not(.input-danger):focus {
  outline: 2px solid rgba(211, 155, 0, 0.18);
  border-color: #d39b00;
}

/* Bloques de entrada para selección simple / alta / baja */
.coupling-input-block {
  border: 1px solid #d7e3f3;
  background: #f9fbff;
  border-radius: 16px;
  padding: 14px;
  margin-bottom: 16px;
}

.coupling-block-header {
  border-bottom: 1px solid #dfe8f5;
  padding-bottom: 10px;
  margin-bottom: 14px;
}

.coupling-block-header h3 {
  margin: 0 0 5px;
  font-size: 16px;
  color: var(--blue);
}

.coupling-block-header p {
  margin: 0;
  color: #64748b;
  font-size: 13px;
  line-height: 1.4;
}

.dual-coupling-fields {
  display: grid;
  gap: 16px;
}

#highSpeedCouplingFields {
  border-left: 5px solid #2563eb;
}

#lowSpeedCouplingFields {
  border-left: 5px solid #0f766e;
}

#singleCouplingFields {
  border-left: 5px solid #64748b;
}

/* Etiquetas visuales dentro de cada bloque */
#highSpeedCouplingFields .coupling-block-header h3::before {
  content: "Alta velocidad · ";
  color: #2563eb;
  font-weight: 800;
}

html[lang="en"] #highSpeedCouplingFields .coupling-block-header h3::before {
  content: "High speed · ";
}

#lowSpeedCouplingFields .coupling-block-header h3::before {
  content: "Baja velocidad · ";
  color: #0f766e;
  font-weight: 800;
}

html[lang="en"] #lowSpeedCouplingFields .coupling-block-header h3::before {
  content: "Low speed · ";
}

/* Asegura que hidden realmente oculte los bloques */
[hidden] {
  display: none !important;
}

/* Guía visual de avance */
.workflow-guide {
  border-radius: 14px;
  padding: 12px 13px;
  margin-bottom: 16px;
  border: 1px solid var(--border);
  background: #ffffff;
  display: grid;
  gap: 4px;
}

.workflow-guide strong {
  font-size: 14px;
}

.workflow-guide p {
  margin: 0;
  font-size: 13px;
  line-height: 1.45;
  color: var(--muted);
}

.workflow-guide.pending {
  border-color: #cbd5e1;
  background: #f8fafc;
}

.workflow-guide.pending strong {
  color: #475569;
}

.workflow-guide.active {
  border-color: #93c5fd;
  background: #eff6ff;
}

.workflow-guide.active strong {
  color: #0057c2;
}

.workflow-guide.complete {
  border-color: #9bd8b4;
  background: #f0fdf4;
}

.workflow-guide.complete strong {
  color: #17823b;
}

.workflow-guide.warning {
  border-color: #f5c16c;
  background: #fff8e6;
}

.workflow-guide.warning strong {
  color: #b86b00;
}

.workflow-guide.danger {
  border-color: #ffb3b3;
  background: #fff1f1;
}

.workflow-guide.danger strong {
  color: #b00020;
}

/* Estados visuales de panel */
.panel.workflow-active {
  border-color: #93c5fd;
  box-shadow: 0 12px 30px rgba(0, 87, 194, 0.12);
}

.panel.workflow-complete {
  border-color: #9bd8b4;
  box-shadow: 0 12px 30px rgba(23, 130, 59, 0.10);
}

.panel.workflow-warning {
  border-color: #f5c16c;
  box-shadow: 0 12px 30px rgba(184, 107, 0, 0.10);
}

.panel.workflow-danger {
  border-color: #ffb3b3;
  box-shadow: 0 12px 30px rgba(176, 0, 32, 0.10);
}

.panel.workflow-pending {
  border-color: var(--border);
}

/* Pequeño indicador superior */
.panel.workflow-complete .panel-header h2::after {
  content: "  ✓";
  color: #17823b;
}

.panel.workflow-warning .panel-header h2::after {
  content: "  ⚠";
  color: #b86b00;
}

.panel.workflow-danger .panel-header h2::after {
  content: "  !";
  color: #b00020;
}

.field-hint {
  margin: 0;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.4;
}

.field-hint.warning {
  border: 1px solid #f5c16c;
  background: #fff8e6;
  color: #8a5200;
  border-radius: 10px;
  padding: 8px 10px;
  font-weight: 700;
}

.preference-fields {
  margin-bottom: 10px;
}

.coupling-preferences {
  border: 1px solid #dfe8f5;
  background: #ffffff;
  border-radius: 14px;
  padding: 12px;
  margin-bottom: 14px;
}

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

.drivetrain-image-box {
  margin-top: 12px;
  border: 1px solid #d8e1ef;
  background: #f8fbff;
  border-radius: 14px;
  padding: 10px;
  overflow: hidden;
}

.drivetrain-image-box img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 10px;
}

.step-hint-box {
  margin-top: 12px;
  margin-bottom: 12px;
  padding: 10px 14px;
  border-radius: 12px;
  border: 1px dashed #3b82f6;
  background: #eff6ff;
  color: #1d4ed8;
  font-weight: 600;
  font-size: 14px;
}

.assistant-section {
  position: relative;
  transition: all 0.2s ease;
}

.assistant-section.step-pending {
  opacity: 0.88;
}

.assistant-section.step-complete {
  border-radius: 14px;
  background: #f0fdf4;
  border: 1px solid #86efac;
}

.assistant-section.step-active {
  border-radius: 14px;
  background: #fff7ed;
  border: 2px solid #f97316;
  box-shadow: 0 0 0 4px rgba(249, 115, 22, 0.14);
}

.assistant-section.step-active::before {
  content: "Empieza aquí";
  position: absolute;
  top: -10px;
  right: 14px;
  background: #f97316;
  color: #ffffff;
  font-size: 12px;
  font-weight: 800;
  padding: 4px 10px;
  border-radius: 999px;
  box-shadow: 0 4px 10px rgba(249, 115, 22, 0.28);
}

html[lang="en"] .assistant-section.step-active::before {
  content: "Start here";
}

.assistant-section.step-next::before {
  content: "Siguiente paso";
}

html[lang="en"] .assistant-section.step-next::before {
  content: "Next step";
}

.config-card:disabled,
.equipment-card:disabled,
#couplingTarget:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.panel.workflow-active {
  box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.12);
}

.readonly-input {
  background: #f8fafc;
  color: #334155;
  font-weight: 700;
  cursor: not-allowed;
}

.readonly-input:focus {
  outline: none;
  border-color: var(--border);
}

.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.55);
  display: grid;
  place-items: center;
  padding: 20px;
  z-index: 1000;
}

.modal-card {
  width: min(520px, 100%);
  background: #ffffff;
  border-radius: 18px;
  box-shadow: 0 24px 70px rgba(15, 23, 42, 0.28);
  border: 1px solid var(--border);
  padding: 20px;
}

.modal-header {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: flex-start;
  border-bottom: 1px solid #e5edf7;
  padding-bottom: 14px;
  margin-bottom: 16px;
}

.modal-header h2 {
  margin: 0;
  color: var(--blue);
  font-size: 21px;
}

.modal-header p {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 14px;
}

.modal-close {
  border: 0;
  background: #f1f5f9;
  color: #334155;
  width: 34px;
  height: 34px;
  border-radius: 999px;
  font-size: 24px;
  line-height: 1;
  cursor: pointer;
}

.modal-close:hover {
  background: #e2e8f0;
}

.lead-form {
  display: grid;
  gap: 2px;
}

.modal-note {
  margin: 4px 0 0;
  border: 1px solid #b8d7ff;
  background: #f7fbff;
  color: #35506f;
  border-radius: 12px;
  padding: 10px 12px;
  font-size: 12px;
  line-height: 1.45;
}

.modal-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-top: 14px;
}

body.modal-open {
  overflow: hidden;
}

.page-layout {
  padding: 18px;
  max-width: 1180px;
  margin: 0 auto;
}

.contact-page {
  display: grid;
  gap: 18px;
}

.contact-hero {
  display: grid;
  gap: 12px;
}

.section-kicker {
  width: fit-content;
  display: inline-block;
  border-radius: 999px;
  background: var(--blue-soft);
  color: var(--blue);
  font-size: 12px;
  font-weight: 900;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 6px 10px;
}

.contact-hero h2 {
  margin: 0;
  color: var(--blue);
  font-size: 30px;
  line-height: 1.15;
}

.contact-hero p {
  margin: 0;
  color: var(--muted);
  max-width: 760px;
  line-height: 1.55;
}

.contact-email-card {
  margin-top: 6px;
  border: 1px solid #b8d7ff;
  background: #f7fbff;
  border-radius: 14px;
  padding: 13px 14px;
  display: grid;
  gap: 4px;
  width: fit-content;
}

.contact-email-card strong {
  color: var(--blue);
  font-size: 13px;
}

.contact-email-card a {
  color: var(--text);
  font-size: 18px;
  font-weight: 900;
  text-decoration: none;
}

.contact-email-card a:hover {
  color: var(--blue);
  text-decoration: underline;
}

.contact-page-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(280px, 0.55fr);
  gap: 18px;
  align-items: start;
}

.contact-form textarea {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 12px;
  font-size: 14px;
  background: white;
  color: var(--text);
  resize: vertical;
  font-family: inherit;
  line-height: 1.45;
}

.contact-form textarea:focus {
  outline: 2px solid rgba(0, 87, 194, 0.18);
  border-color: var(--blue);
}

.contact-actions {
  grid-template-columns: 1fr 180px;
}

.secondary-link-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  padding: 12px 14px;
  font-weight: 800;
  text-decoration: none;
  color: var(--blue);
  background: white;
  border: 1px solid var(--blue);
}

.secondary-link-btn:hover {
  background: var(--blue-soft);
}

.contact-side-panel {
  position: sticky;
  top: 18px;
}

.contact-support-list {
  display: grid;
  gap: 13px;
}

.contact-support-list div {
  border-top: 1px solid #eef2f7;
  padding-top: 12px;
}

.contact-support-list div:first-child {
  border-top: 0;
  padding-top: 0;
}

.contact-support-list h3 {
  margin: 0 0 6px;
  color: var(--blue);
  font-size: 15px;
}

.contact-support-list p {
  margin: 0;
  color: var(--muted);
  line-height: 1.45;
  font-size: 13px;
}

.form-status {
  border-radius: 12px;
  padding: 11px 12px;
  font-size: 13px;
  line-height: 1.45;
  font-weight: 800;
}

.form-status.info {
  border: 1px solid #b8d7ff;
  background: #f7fbff;
  color: #064b9b;
}

.form-status.success {
  border: 1px solid #9bd8b4;
  background: #f0fdf4;
  color: #17823b;
}

.form-status.error {
  border: 1px solid #ffb3b3;
  background: #fff1f1;
  color: #b00020;
}

.anti-spam-field {
  position: absolute;
  left: -9999px;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

.guide-page {
  display: grid;
  gap: 18px;
}

.guide-hero {
  display: grid;
  gap: 12px;
}

.guide-hero h2 {
  margin: 0;
  color: var(--blue);
  font-size: 32px;
  line-height: 1.15;
}

.guide-hero p {
  margin: 0;
  color: var(--muted);
  max-width: 860px;
  line-height: 1.55;
}

.guide-cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 6px;
}

.primary-link-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  padding: 12px 16px;
  font-weight: 900;
  text-decoration: none;
  color: #ffffff;
  background: var(--blue);
  border: 1px solid var(--blue);
}

.primary-link-btn:hover {
  background: var(--blue-dark);
}

.guide-grid {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  gap: 18px;
  align-items: start;
}

.guide-index {
  position: sticky;
  top: 18px;
}

.guide-index-list {
  display: grid;
  gap: 8px;
}

.guide-index-list a {
  text-decoration: none;
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 11px;
  font-weight: 800;
  font-size: 13px;
  background: #ffffff;
}

.guide-index-list a:hover {
  color: var(--blue);
  border-color: #b8d7ff;
  background: #f7fbff;
}

.guide-content {
  display: grid;
  gap: 18px;
}

.guide-section {
  scroll-margin-top: 18px;
}

.guide-section h2 {
  margin: 8px 0 10px;
  color: var(--blue);
  font-size: 23px;
}

.guide-section p {
  color: var(--muted);
  line-height: 1.6;
  margin: 0 0 12px;
}

.formula-box {
  border: 1px solid #b8d7ff;
  background: #f7fbff;
  color: var(--blue);
  border-radius: 14px;
  padding: 16px;
  margin: 14px 0;
  text-align: center;
}

.formula-box strong {
  font-size: 24px;
}

.definition-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin: 14px 0;
}

.definition-list div {
  border: 1px solid var(--border);
  background: #ffffff;
  border-radius: 12px;
  padding: 12px;
  display: grid;
  gap: 4px;
}

.definition-list strong {
  color: var(--blue);
  font-size: 18px;
}

.definition-list span {
  color: var(--muted);
  font-size: 13px;
}

.example-box {
  border: 1px solid #d8e1ef;
  background: #ffffff;
  border-radius: 14px;
  padding: 14px;
  margin-top: 12px;
}

.example-box h3 {
  margin: 0 0 8px;
  color: var(--blue);
}

.example-box strong {
  color: var(--text);
}

.guide-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 14px;
  font-size: 14px;
}

.guide-table th,
.guide-table td {
  border: 1px solid #dbe5f3;
  padding: 10px 12px;
  text-align: left;
}

.guide-table th {
  background: #eff6ff;
  color: var(--blue);
}

.guide-table td:first-child {
  font-weight: 800;
  color: var(--text);
}

.check-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin-top: 14px;
}

.check-grid div {
  border: 1px solid var(--border);
  background: #ffffff;
  border-radius: 12px;
  padding: 11px 12px;
  color: var(--text);
  font-weight: 800;
  font-size: 13px;
}

.check-grid div::before {
  content: "✓ ";
  color: var(--green);
  font-weight: 900;
}

.family-card-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 14px;
}

.family-card-grid div {
  border: 1px solid var(--border);
  background: #ffffff;
  border-radius: 14px;
  padding: 14px;
}

.family-card-grid h3 {
  margin: 0 0 8px;
  color: var(--blue);
  font-size: 16px;
}

.family-card-grid p {
  margin: 0;
  font-size: 13px;
}

.warning-section {
  border-color: #f5c16c;
  background: #fffaf0;
}

.warning-section .section-kicker {
  background: #fff4d6;
  color: #b86b00;
}

.guide-final-cta {
  border-color: #b8d7ff;
  background: #f7fbff;
}

@media (max-width: 980px) {
  .guide-grid {
    grid-template-columns: 1fr;
  }

  .guide-index {
    position: static;
  }

  .definition-list,
  .check-grid,
  .family-card-grid {
    grid-template-columns: 1fr;
  }

  .guide-hero h2 {
    font-size: 25px;
  }

  .formula-box strong {
    font-size: 20px;
  }
}

@media (max-width: 900px) {
  .contact-page-grid {
    grid-template-columns: 1fr;
  }

  .contact-side-panel {
    position: static;
  }

  .contact-actions {
    grid-template-columns: 1fr;
  }

  .contact-hero h2 {
    font-size: 24px;
  }

  .contact-email-card {
    width: 100%;
  }
}

.suppliers-page {
  display: grid;
  gap: 18px;
}

.suppliers-hero {
  display: grid;
  gap: 12px;
}

.suppliers-hero h2 {
  margin: 0;
  color: var(--blue);
  font-size: 32px;
  line-height: 1.15;
}

.suppliers-hero p {
  margin: 0;
  color: var(--muted);
  max-width: 900px;
  line-height: 1.55;
}

.suppliers-grid {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  gap: 18px;
  align-items: start;
}

.suppliers-index {
  position: sticky;
  top: 18px;
}

.suppliers-content {
  display: grid;
  gap: 18px;
}

.supplier-section {
  scroll-margin-top: 18px;
}

.supplier-section h2 {
  margin: 8px 0 10px;
  color: var(--blue);
  font-size: 23px;
}

.supplier-section p {
  color: var(--muted);
  line-height: 1.6;
  margin: 0 0 12px;
}

.supplier-feature-grid,
.catalog-data-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin-top: 14px;
}

.supplier-feature-grid div,
.catalog-data-grid div {
  border: 1px solid var(--border);
  background: #ffffff;
  border-radius: 12px;
  padding: 11px 12px;
  color: var(--text);
  font-weight: 800;
  font-size: 13px;
}

.supplier-feature-grid div::before,
.catalog-data-grid div::before {
  content: "✓ ";
  color: var(--green);
  font-weight: 900;
}

.supplier-benefit-grid,
.collaboration-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 14px;
}

.supplier-benefit-grid div,
.collaboration-grid div {
  border: 1px solid var(--border);
  background: #ffffff;
  border-radius: 14px;
  padding: 14px;
}

.supplier-benefit-grid h3,
.collaboration-grid h3 {
  margin: 0 0 8px;
  color: var(--blue);
  font-size: 16px;
}

.supplier-benefit-grid p,
.collaboration-grid p {
  margin: 0;
  font-size: 13px;
}

.supplier-note {
  margin-top: 14px;
  border: 1px solid #b8d7ff;
  background: #f7fbff;
  color: #35506f;
  border-radius: 12px;
  padding: 12px 13px;
  font-size: 13px;
  line-height: 1.45;
  font-weight: 700;
}

.strong-note {
  border-color: #f5c16c;
  background: #fff8e6;
  color: #8a5200;
}

.supplier-final-cta {
  border-color: #b8d7ff;
  background: #f7fbff;
}

.supplier-final-cta .contact-email-card {
  margin: 12px 0 8px;
}

@media (max-width: 980px) {
  .suppliers-grid {
    grid-template-columns: 1fr;
  }

  .suppliers-index {
    position: static;
  }

  .supplier-feature-grid,
  .catalog-data-grid,
  .supplier-benefit-grid,
  .collaboration-grid {
    grid-template-columns: 1fr;
  }

  .suppliers-hero h2 {
    font-size: 25px;
  }
}

.legal-page {
  display: grid;
  gap: 18px;
}

.legal-hero {
  display: grid;
  gap: 12px;
}

.legal-hero h2 {
  margin: 0;
  color: var(--blue);
  font-size: 32px;
  line-height: 1.15;
}

.legal-hero p {
  margin: 0;
  color: var(--muted);
  max-width: 900px;
  line-height: 1.6;
}

.legal-content {
  display: grid;
  gap: 18px;
}

.legal-section h2 {
  margin: 0 0 10px;
  color: var(--blue);
  font-size: 23px;
}

.legal-section p {
  margin: 0 0 12px;
  color: var(--muted);
  line-height: 1.65;
}

.legal-final-cta {
  border-color: #b8d7ff;
  background: #f7fbff;
}

@media (max-width: 760px) {
  .legal-hero h2 {
    font-size: 25px;
  }
}

/* ================================
   Responsive móvil TorqueSelector
   ================================ */

@media (max-width: 900px) {
  html,
  body {
    width: 100%;
    max-width: 100%;
    overflow-x: hidden;
  }

  body {
    margin: 0;
  }

  main,
  .main,
  .page,
  .page-shell,
  .app-shell,
  .selector-shell,
  .selector-layout,
  .selector-grid,
  .main-grid,
  .content-grid,
  .workflow-grid {
    width: 100% !important;
    max-width: 100% !important;
  }

  .selector-layout,
  .selector-grid,
  .main-grid,
  .content-grid,
  .workflow-grid,
  .app-grid {
    display: grid !important;
    grid-template-columns: minmax(0, 1fr) !important;
    gap: 16px !important;
  }

  .diagram-panel,
  .input-panel,
  .results-panel {
    width: 100% !important;
    max-width: 100% !important;
    min-width: 0 !important;
    box-sizing: border-box;
  }

  .diagram-panel {
    order: 1;
  }

  .input-panel {
    order: 2;
  }

  .results-panel {
    order: 3;
  }

  .panel,
  .card,
  .result-card,
  .alternative-card,
  .workflow-card,
  .technical-guidance,
  .guide-box,
  .ad-card,
  .support-card {
    max-width: 100% !important;
    box-sizing: border-box;
  }

  input,
  select,
  textarea,
  button {
    max-width: 100%;
    box-sizing: border-box;
  }

  .download-btn,
  #downloadPdfBtn,
  .primary-btn,
  .secondary-btn,
  .form-actions button {
    width: 100%;
  }

  .form-row,
  .input-row,
  .field-row,
  .result-row,
  .alternative-grid {
    grid-template-columns: minmax(0, 1fr) !important;
  }

  .equipment-grid,
  .equipment-cards,
  .equipment-options {
    grid-template-columns: repeat(2, minmax(0, 1fr)) !important;
  }

  .config-card,
  .equipment-card {
    width: 100%;
  }

  header,
  .site-header,
  .topbar,
  .header-inner {
    max-width: 100%;
    box-sizing: border-box;
  }

  nav,
  .main-nav,
  .nav-links {
    display: flex;
    flex-wrap: nowrap;
    gap: 8px;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    padding-bottom: 4px;
  }

  nav a,
  .main-nav a,
  .nav-links a {
    white-space: nowrap;
  }
}

/* Selector exacto para el layout de 3 columnas.
   Chrome móvil soporta :has(), así forzamos el apilado aunque el contenedor tenga otro nombre. */
@media (max-width: 900px) {
  :is(main, section, div):has(> .diagram-panel):has(> .input-panel):has(> .results-panel) {
    display: grid !important;
    grid-template-columns: minmax(0, 1fr) !important;
    gap: 16px !important;
    width: 100% !important;
    max-width: 100% !important;
  }
}

@media (max-width: 600px) {
  body {
    font-size: 14px;
  }

  .diagram-panel,
  .input-panel,
  .results-panel {
    padding: 14px !important;
  }

  .equipment-grid,
  .equipment-cards,
  .equipment-options {
    grid-template-columns: repeat(2, minmax(0, 1fr)) !important;
    gap: 8px !important;
  }

  .config-card,
  .equipment-card {
    padding: 12px !important;
  }

  .result-row {
    gap: 4px;
  }

  .alternative-grid {
    gap: 8px;
  }

  .pdf-lead-modal,
  .modal-content,
  .modal-card {
    width: calc(100vw - 24px) !important;
    max-width: calc(100vw - 24px) !important;
  }

  .form-actions,
  .modal-actions {
    display: grid !important;
    grid-template-columns: 1fr !important;
    gap: 10px !important;
  }
}

@media (max-width: 1180px) {
  body {
    padding-top: 0;
  }

  .topbar {
    position: static;
    height: auto;
    gap: 12px;
    align-items: flex-start;
    flex-direction: column;
    padding: 16px;
  }

  .brand {
    gap: 10px;
  }

  .brand-mark {
    width: 42px;
    height: 42px;
    border-radius: 12px;
    flex: 0 0 auto;
  }

  .brand h1 {
    font-size: 25px;
  }

  .brand p {
    font-size: 14px;
  }

  .topbar-actions {
    width: 100%;
    align-items: flex-start;
    flex-direction: column;
    gap: 10px;
  }

  .main-nav {
    width: 100%;
    display: flex;
    flex-wrap: nowrap;
    gap: 8px;
    overflow-x: auto;
    padding-bottom: 4px;
    -webkit-overflow-scrolling: touch;
  }

  .main-nav a {
    white-space: nowrap;
    padding: 10px 12px;
  }

  .language-switcher {
    align-self: flex-start;
  }

  .layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    gap: 16px;
    padding: 14px;
  }

  .diagram-panel,
  .input-panel,
  .results-panel {
    grid-column: 1;
    grid-row: auto;
    width: 100%;
    min-width: 0;
  }
}

@media (max-width: 520px) {
  .topbar {
    padding: 14px 12px;
  }

  .brand h1 {
    font-size: 23px;
  }

  .brand p {
    font-size: 13px;
  }

  .layout {
    padding: 12px;
    gap: 14px;
  }

  .panel {
    padding: 14px;
    border-radius: 16px;
  }

  .power-row {
    grid-template-columns: minmax(0, 1fr) auto;
  }

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

  .result-row {
    display: grid;
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .result-row strong {
    text-align: left;
  }

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

/* ==================================================
   FIX FINAL MOBILE LAYOUT - TorqueSelector
   ================================================== */

@media screen and (max-width: 1180px) {
  body {
    padding-top: 0 !important;
  }

  .topbar {
    position: static !important;
    height: auto !important;
    flex-direction: column !important;
    align-items: flex-start !important;
    gap: 12px !important;
    padding: 16px !important;
  }

  .topbar-actions {
    width: 100% !important;
    flex-direction: column !important;
    align-items: flex-start !important;
    gap: 10px !important;
  }

  .main-nav {
    width: 100% !important;
    display: flex !important;
    flex-wrap: nowrap !important;
    overflow-x: auto !important;
    gap: 8px !important;
    padding-bottom: 6px !important;
    -webkit-overflow-scrolling: touch !important;
  }

  .main-nav a {
    white-space: nowrap !important;
  }

  .layout {
    display: grid !important;
    grid-template-columns: minmax(0, 1fr) !important;
    grid-auto-columns: minmax(0, 1fr) !important;
    gap: 16px !important;
    padding: 14px !important;
    width: 100% !important;
    max-width: 100% !important;
    overflow-x: hidden !important;
  }

  .diagram-panel,
  .input-panel,
  .results-panel {
    grid-column: 1 / -1 !important;
    grid-row: auto !important;
    width: 100% !important;
    max-width: 100% !important;
    min-width: 0 !important;
  }
}

@media screen and (max-width: 520px) {
  .brand h1 {
    font-size: 23px !important;
  }

  .brand p {
    font-size: 13px !important;
  }

  .brand-mark {
    width: 42px !important;
    height: 42px !important;
    border-radius: 12px !important;
    flex: 0 0 auto !important;
  }

  .panel {
    padding: 14px !important;
  }

  .result-row {
    display: grid !important;
    grid-template-columns: 1fr !important;
    gap: 4px !important;
  }

  .result-row strong {
    text-align: left !important;
  }

  .alternative-grid {
    grid-template-columns: 1fr !important;
  }

  .actions {
    grid-template-columns: 1fr !important;
  }

  .power-row {
    grid-template-columns: minmax(0, 1fr) auto !important;
  }

  .equipment-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr)) !important;
  }

  .download-btn {
    width: 100% !important;
  }
}