/* =============================================
   Collision Analysis — Premium Light Theme
   v2 — Three distinct visual identities
   ============================================= */

/* ---- Theme Colors ---- */
:root {
  /* Momentum 360 — Deep Ocean Blue */
  --mom-primary: #0369a1;
  --mom-secondary: #0ea5e9;
  --mom-bg: #f0f9ff;
  --mom-bg-hover: #e0f2fe;
  --mom-border: #bae6fd;
  --mom-border-strong: #7dd3fc;
  --mom-gradient: linear-gradient(135deg, #0369a1, #0ea5e9);
  --mom-glow: rgba(14, 165, 233, 0.15);
  --mom-text: #0c4a6e;
  --mom-badge-bg: #e0f2fe;

  /* Newton Impact — Warm Amber */
  --newt-primary: #b45309;
  --newt-secondary: #f59e0b;
  --newt-bg: #fffbeb;
  --newt-bg-hover: #fef3c7;
  --newt-border: #fde68a;
  --newt-border-strong: #fbbf24;
  --newt-gradient: linear-gradient(135deg, #b45309, #f59e0b);
  --newt-glow: rgba(245, 158, 11, 0.15);
  --newt-text: #78350f;
  --newt-badge-bg: #fef3c7;

  /* Contact Points — Rich Emerald */
  --cp-primary: #047857;
  --cp-secondary: #10b981;
  --cp-bg: #ecfdf5;
  --cp-bg-hover: #d1fae5;
  --cp-border: #a7f3d0;
  --cp-border-strong: #6ee7b7;
  --cp-gradient: linear-gradient(135deg, #047857, #10b981);
  --cp-glow: rgba(16, 185, 129, 0.15);
  --cp-text: #064e3b;
  --cp-badge-bg: #d1fae5;
}

/* ---- Page padding ---- */
.app-shell__content > .method-selector,
.app-shell__content > .collision-panel,
.app-shell__content > .collision-pro-banner {
  margin-left: 40px;
  margin-right: 40px;
}

/* ===== METHOD SELECTOR CARDS ===== */
.method-selector {
  display: flex;
  gap: 14px;
  padding: 28px 40px;
}

.method-card {
  flex: 1;
  position: relative;
  padding: 20px 18px;
  border-radius: 16px;
  border: 2px solid #e5e7eb;
  background: #fff;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  text-align: left;
  box-shadow: 0 1px 3px rgba(0,0,0,0.04);
}
.method-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(0,0,0,0.08);
}

.method-card__glow {
  display: none;
}

.method-card__icon {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 12px;
  transition: all 0.3s;
}
.method-card__icon svg {
  width: 22px;
  height: 22px;
}

.method-card__name {
  font-size: 14px;
  font-weight: 700;
  color: #1d1729;
  margin-bottom: 4px;
  transition: color 0.3s;
  font-family: var(--font-heading, 'Montserrat', sans-serif);
}
.method-card__desc {
  font-size: 12px;
  color: #6b7280;
  line-height: 1.4;
}

/* ---- Momentum Card ---- */
.method-card--momentum .method-card__icon {
  background: var(--mom-bg);
  border: 1px solid var(--mom-border);
}
.method-card--momentum.method-card--active {
  border-color: var(--mom-secondary);
  background: var(--mom-bg);
  box-shadow: 0 4px 20px var(--mom-glow), 0 0 0 1px var(--mom-border);
}
.method-card--momentum.method-card--active .method-card__icon {
  background: var(--mom-gradient);
  border-color: transparent;
  box-shadow: 0 4px 12px var(--mom-glow);
}
.method-card--momentum.method-card--active .method-card__icon svg { stroke: #fff; }
.method-card--momentum.method-card--active .method-card__name { color: var(--mom-primary); }

/* ---- Newton Card ---- */
.method-card--newton .method-card__icon {
  background: var(--newt-bg);
  border: 1px solid var(--newt-border);
}
.method-card--newton.method-card--active {
  border-color: var(--newt-secondary);
  background: var(--newt-bg);
  box-shadow: 0 4px 20px var(--newt-glow), 0 0 0 1px var(--newt-border);
}
.method-card--newton.method-card--active .method-card__icon {
  background: var(--newt-gradient);
  border-color: transparent;
  box-shadow: 0 4px 12px var(--newt-glow);
}
.method-card--newton.method-card--active .method-card__icon svg { stroke: #fff; }
.method-card--newton.method-card--active .method-card__name { color: var(--newt-primary); }

/* ---- Contact Card ---- */
.method-card--contact .method-card__icon {
  background: var(--cp-bg);
  border: 1px solid var(--cp-border);
}
.method-card--contact.method-card--active {
  border-color: var(--cp-secondary);
  background: var(--cp-bg);
  box-shadow: 0 4px 20px var(--cp-glow), 0 0 0 1px var(--cp-border);
}
.method-card--contact.method-card--active .method-card__icon {
  background: var(--cp-gradient);
  border-color: transparent;
  box-shadow: 0 4px 12px var(--cp-glow);
}
.method-card--contact.method-card--active .method-card__icon svg { stroke: #fff; }
.method-card--contact.method-card--active .method-card__name { color: var(--cp-primary); }

/* ===== PANEL TRANSITIONS ===== */
.collision-panel {
  display: none;
  padding: 0 40px 40px;
}
.collision-panel--active { display: block; }

/* Avoid FOUC — keep the active panel invisible until JS has decided lock vs unlock state */
.collision-panel--active:not(.collision-panel--locked):not(.collision-panel--ready) {
  visibility: hidden;
}

/* Once JS marks the panel ready (locked or unlocked), play the fade-in */
.collision-panel--locked,
.collision-panel--ready {
  animation: panelIn 0.25s ease;
}

@keyframes panelIn {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ===== METHOD HEADER ===== */
.method-header {
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 22px 26px;
  border-radius: 16px;
  margin-bottom: 24px;
  position: relative;
  overflow: hidden;
}

.method-header__num {
  width: 48px;
  height: 48px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 20px;
  font-weight: 800;
  color: #fff;
  font-family: var(--font-heading, 'Montserrat', sans-serif);
}
.method-header__text h3 {
  font-size: 17px;
  font-weight: 700;
  margin: 0 0 5px 0;
  font-family: var(--font-heading, 'Montserrat', sans-serif);
}
.method-header__text p {
  font-size: 13px;
  margin: 0;
  line-height: 1.5;
}

/* Momentum header */
.method-header--momentum {
  background: var(--mom-bg);
  border: 1px solid var(--mom-border);
}
.method-header--momentum .method-header__num { background: var(--mom-gradient); box-shadow: 0 4px 14px var(--mom-glow); }
.method-header--momentum .method-header__text h3 { color: var(--mom-primary); }
.method-header--momentum .method-header__text p { color: var(--mom-text); opacity: 0.7; }

/* Newton header */
.method-header--newton {
  background: var(--newt-bg);
  border: 1px solid var(--newt-border);
}
.method-header--newton .method-header__num { background: var(--newt-gradient); box-shadow: 0 4px 14px var(--newt-glow); }
.method-header--newton .method-header__text h3 { color: var(--newt-primary); }
.method-header--newton .method-header__text p { color: var(--newt-text); opacity: 0.7; }

/* Contact header */
.method-header--contact {
  background: var(--cp-bg);
  border: 1px solid var(--cp-border);
}
.method-header--contact .method-header__num { background: var(--cp-gradient); box-shadow: 0 4px 14px var(--cp-glow); }
.method-header--contact .method-header__text h3 { color: var(--cp-primary); }
.method-header--contact .method-header__text p { color: var(--cp-text); opacity: 0.7; }

/* ===== VEHICLE SECTIONS ===== */
.vehicle-section {
  border-radius: 14px;
  border: 1px solid #e5e7eb;
  background: #fff;
  margin-bottom: 16px;
  overflow: hidden;
  box-shadow: 0 1px 3px rgba(0,0,0,0.03);
}
.vehicle-section__header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 13px 20px;
  border-bottom: 1px solid #f3f4f6;
  background: #fafbfc;
}
.vehicle-section__dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}
.vehicle-section__dot--v1 { background: #3b82f6; box-shadow: 0 0 0 3px rgba(59,130,246,0.15); }
.vehicle-section__dot--v2 { background: #22c55e; box-shadow: 0 0 0 3px rgba(34,197,94,0.15); }
.vehicle-section__label {
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: #374151;
}
.vehicle-section__body {
  padding: 18px 20px;
}

/* ===== INPUT GRID ===== */
.input-grid {
  display: grid;
  gap: 14px;
}
.input-grid--4 { grid-template-columns: repeat(4, 1fr); }
.input-grid--3 { grid-template-columns: repeat(3, 1fr); }
.input-grid--2 { grid-template-columns: repeat(2, 1fr); }

.input-field label {
  display: block;
  font-size: 11.5px;
  font-weight: 600;
  color: #4b5563;
  margin-bottom: 6px;
  letter-spacing: 0.15px;
}
.input-field input[type="number"],
.input-field select {
  width: 100%;
  padding: 10px 12px;
  border-radius: 10px;
  border: 1.5px solid #d1d5db;
  background: #fff;
  color: #1d1729;
  font-size: 14px;
  font-weight: 600;
  font-family: 'JetBrains Mono', 'SF Mono', Consolas, monospace;
  outline: none;
  transition: all 0.2s;
}
.input-field input:hover {
  border-color: #9ca3af;
}
.input-field input:focus {
  border-color: #7243f2;
  box-shadow: 0 0 0 3px rgba(114, 67, 242, 0.1);
  background: #fff;
}

/* Theme-specific focus */
.panel--momentum .input-field input:focus { border-color: var(--mom-secondary); box-shadow: 0 0 0 3px var(--mom-glow); }
.panel--newton .input-field input:focus { border-color: var(--newt-secondary); box-shadow: 0 0 0 3px var(--newt-glow); }
.panel--contact .input-field input:focus { border-color: var(--cp-secondary); box-shadow: 0 0 0 3px var(--cp-glow); }

/* ---- Inline checkbox ---- */
.input-check {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-top: 8px;
}
.input-check input[type="checkbox"] {
  width: auto;
  accent-color: var(--cp-primary);
  cursor: pointer;
}
.input-check label {
  font-size: 11px;
  margin: 0;
  color: #6b7280;
  font-weight: 500;
  cursor: pointer;
}

/* ===== PARAMS SECTION ===== */
.params-section {
  padding: 18px 20px;
  border-radius: 14px;
  border: 1px solid #e5e7eb;
  background: #fff;
  margin-bottom: 16px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.03);
}
.params-section__title {
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  margin: 0 0 14px 0;
}
.panel--momentum .params-section__title { color: var(--mom-primary); }
.panel--newton .params-section__title { color: var(--newt-primary); }
.panel--contact .params-section__title { color: var(--cp-primary); }

.params-hint {
  font-size: 11px;
  color: #9ca3af;
  margin-top: 12px;
  line-height: 1.5;
  padding: 8px 12px;
  background: #f9fafb;
  border-radius: 8px;
  border: 1px solid #f3f4f6;
}

/* ===== CALCULATE BUTTON ===== */
.calc-actions {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
  margin: 28px 0;
}

.calc-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 48px;
  border: none;
  border-radius: 14px;
  color: #fff;
  font-weight: 700;
  font-size: 15px;
  cursor: pointer;
  transition: all 0.25s;
  position: relative;
  letter-spacing: 0.2px;
  font-family: var(--font-heading, 'Montserrat', sans-serif);
}
.calc-btn:hover {
  transform: translateY(-2px);
  filter: brightness(1.05);
}
.calc-btn:active { transform: translateY(0); }

.calc-btn--momentum { background: var(--mom-gradient); box-shadow: 0 6px 20px var(--mom-glow); }
.calc-btn--newton { background: var(--newt-gradient); box-shadow: 0 6px 20px var(--newt-glow); }
.calc-btn--contact { background: var(--cp-gradient); box-shadow: 0 6px 20px var(--cp-glow); }

.calc-btn__icon {
  width: 18px;
  height: 18px;
}

/* ===== RESULTS PANEL ===== */
.results-panel {
  border-radius: 16px;
  padding: 0;
  margin-bottom: 24px;
  overflow: hidden;
  animation: resultsReveal 0.4s ease;
  box-shadow: 0 2px 8px rgba(0,0,0,0.04);
}
@keyframes resultsReveal {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.results-panel__header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 15px 22px;
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: #fff;
}
.results-panel__header svg { width: 16px; height: 16px; }

.results-panel--momentum { border: 1px solid var(--mom-border); }
.results-panel--momentum .results-panel__header { background: var(--mom-gradient); }

.results-panel--newton { border: 1px solid var(--newt-border); }
.results-panel--newton .results-panel__header { background: var(--newt-gradient); }

.results-panel--contact { border: 1px solid var(--cp-border); }
.results-panel--contact .results-panel__header { background: var(--cp-gradient); }

.results-panel__body {
  padding: 18px 22px;
  background: #fff;
}

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

.result-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 10px 14px;
  border-radius: 10px;
  background: #f9fafb;
  border: 1px solid #f3f4f6;
  gap: 12px;
}
.result-row--full { grid-column: 1 / -1; }

.result-row__key {
  font-size: 12px;
  font-weight: 700;
  color: #374151;
  white-space: nowrap;
}
.result-row__val {
  font-family: 'JetBrains Mono', Consolas, monospace;
  font-size: 12px;
  text-align: right;
  word-break: break-all;
  font-weight: 600;
}

/* Theme-specific result values */
.panel--momentum .result-row__val { color: var(--mom-primary); }
.panel--newton .result-row__val { color: var(--newt-primary); }
.panel--contact .result-row__val { color: var(--cp-primary); }

.result-row__val--hero {
  font-size: 16px;
  font-weight: 800;
}
.panel--momentum .result-row__val--hero { color: var(--mom-primary); }
.panel--newton .result-row__val--hero { color: var(--newt-primary); }
.panel--contact .result-row__val--hero { color: var(--cp-primary); }

.result-row--error .result-row__val { color: #dc2626 !important; }

/* ===== CANVAS SECTION ===== */
.canvas-section {
  margin-top: 12px;
}
.canvas-section__title {
  text-align: center;
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: #9ca3af;
  margin-bottom: 12px;
}
.canvas-wrap {
  width: 100%;
  border-radius: 14px;
  overflow: hidden;
  position: relative;
  box-shadow: 0 2px 8px rgba(0,0,0,0.06);
}
.panel--momentum .canvas-wrap { border: 2px solid var(--mom-border); }
.panel--newton .canvas-wrap { border: 2px solid var(--newt-border); }
.panel--contact .canvas-wrap { border: 2px solid var(--cp-border); }

.canvas-wrap canvas {
  width: 100%;
  height: 420px;
  display: block;
  background: #fff;
}
.canvas-actions {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin-top: 14px;
}

/* ---- Secondary Button ---- */
.btn-secondary-coll {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 9px 18px;
  border: 1.5px solid #d1d5db;
  border-radius: 10px;
  background: #fff;
  color: #374151;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}
.btn-secondary-coll:hover {
  background: #f9fafb;
  border-color: #9ca3af;
  color: #1d1729;
}

/* ===== TOOLBAR (Generic — themed per panel) ===== */
.coll-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 16px;
}
.coll-file-menu {
  position: relative;
  display: inline-block;
}
.coll-file-btn {
  padding: 9px 16px;
  border-radius: 10px;
  border: 1.5px solid #d1d5db;
  background: #f9fafb;
  color: #374151;
  font-weight: 700;
  font-size: 12px;
  cursor: pointer;
  transition: all 0.2s;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.coll-file-btn:hover { background: #f3f4f6; }

.coll-file-dropdown {
  display: none;
  position: absolute;
  left: 0;
  top: calc(100% + 6px);
  min-width: 170px;
  background: #fff;
  border: 1px solid #e5e7eb;
  border-radius: 12px;
  box-shadow: 0 12px 40px rgba(0,0,0,0.12);
  overflow: hidden;
  z-index: 100;
}
.coll-file-menu.open .coll-file-dropdown { display: block; }
.coll-file-item {
  padding: 11px 16px;
  cursor: pointer;
  font-size: 13px;
  font-weight: 600;
  color: #374151;
  border-bottom: 1px solid #f3f4f6;
  transition: all 0.15s;
}
.coll-file-item:last-child { border-bottom: none; }
.coll-file-item:hover { background: #f9fafb; }

/* Theme overrides per panel */
.panel--momentum .coll-file-btn {
  border-color: var(--mom-border-strong);
  background: var(--mom-bg);
  color: var(--mom-primary);
}
.panel--momentum .coll-file-btn:hover { background: var(--mom-bg-hover); }
.panel--momentum .coll-file-item:hover { background: var(--mom-bg); color: var(--mom-primary); }

.panel--newton .coll-file-btn {
  border-color: var(--newt-border-strong);
  background: var(--newt-bg);
  color: var(--newt-primary);
}
.panel--newton .coll-file-btn:hover { background: var(--newt-bg-hover); }
.panel--newton .coll-file-item:hover { background: var(--newt-bg); color: var(--newt-primary); }

.panel--contact .coll-file-btn {
  border-color: var(--cp-border-strong);
  background: var(--cp-bg);
  color: var(--cp-primary);
}
.panel--contact .coll-file-btn:hover { background: var(--cp-bg-hover); }
.panel--contact .coll-file-item:hover { background: var(--cp-bg); color: var(--cp-primary); }

/* Backwards compat — keep cp-* working as aliases */
.cp-toolbar { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 10px; margin-bottom: 16px; }
.cp-file-menu { position: relative; display: inline-block; }
.cp-file-btn {
  padding: 9px 16px; border-radius: 10px;
  border: 1.5px solid var(--cp-border-strong);
  background: var(--cp-bg); color: var(--cp-primary);
  font-weight: 700; font-size: 12px; cursor: pointer; transition: all 0.2s;
}
.cp-file-btn:hover { background: var(--cp-bg-hover); }
.cp-file-dropdown {
  display: none; position: absolute; left: 0; top: calc(100% + 6px);
  min-width: 170px; background: #fff; border: 1px solid #e5e7eb;
  border-radius: 12px; box-shadow: 0 12px 40px rgba(0,0,0,0.12);
  overflow: hidden; z-index: 100;
}
.cp-file-menu.open .cp-file-dropdown { display: block; }
.cp-file-item {
  padding: 11px 16px; cursor: pointer; font-size: 13px; font-weight: 600;
  color: #374151; border-bottom: 1px solid #f3f4f6; transition: all 0.15s;
}
.cp-file-item:last-child { border-bottom: none; }
.cp-file-item:hover { background: var(--cp-bg); color: var(--cp-primary); }

.cp-mode-toggle {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.cp-mode-toggle .label {
  font-size: 12px;
  font-weight: 600;
  color: #6b7280;
}
.cp-mode-toggle select {
  padding: 7px 12px;
  border-radius: 8px;
  border: 1.5px solid var(--cp-border-strong);
  background: var(--cp-bg);
  color: var(--cp-primary);
  font-weight: 600;
  font-size: 12px;
  cursor: pointer;
  outline: none;
}
.cp-mode-toggle select:focus {
  box-shadow: 0 0 0 3px var(--cp-glow);
}

/* ===== PRO BANNER ===== */
.collision-pro-banner {
  background: linear-gradient(135deg, #f5f3ff, #ede9fe);
  border: 1px solid #ddd6fe;
  border-radius: 16px;
  padding: 22px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  margin: 0 40px 24px;
}
.collision-pro-banner__text h3 {
  font-size: 15px;
  font-weight: 700;
  color: #1d1729;
  margin: 0 0 4px 0;
  font-family: var(--font-heading, 'Montserrat', sans-serif);
}
.collision-pro-banner__text p {
  font-size: 13px;
  color: #6b7280;
  margin: 0;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 991px) {
  .method-selector { padding: 20px 24px; }
  .collision-panel { padding: 0 24px 24px; }
  .collision-pro-banner { margin: 0 24px 20px; }
}

@media (max-width: 800px) {
  .input-grid--4 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .method-selector {
    flex-direction: column;
    gap: 10px;
    padding: 16px 16px;
  }
  .method-card { padding: 14px; }
  .method-header { padding: 16px 18px; gap: 14px; }
  .collision-panel { padding: 0 16px 20px; }
  .collision-pro-banner {
    flex-direction: column;
    text-align: center;
    margin: 0 16px 16px;
  }
  .results-grid { grid-template-columns: 1fr; }
}

@media (max-width: 500px) {
  .input-grid--4,
  .input-grid--3,
  .input-grid--2 {
    grid-template-columns: 1fr;
  }
  .method-selector { padding: 12px; }
  .collision-panel { padding: 0 12px 16px; }
}

/* ===== PRO LOCK OVERLAY ===== */
.collision-panel--locked {
  position: relative;
}

/* When panel is locked: keep method-header visible (teaser), blur everything else */
.collision-panel--locked .vehicle-section,
.collision-panel--locked .params-section,
.collision-panel--locked .calc-actions,
.collision-panel--locked .results-panel,
.collision-panel--locked .canvas-section,
.collision-panel--locked .cp-toolbar,
.collision-panel--locked .coll-toolbar {
  filter: blur(4px);
  pointer-events: none;
  user-select: none;
  opacity: 0.5;
}

/* Lock-overlay starts BELOW the method-header so the teaser stays visible */
.collision-lock-overlay {
  position: absolute;
  inset: 130px 0 0; /* leave method-header visible at top */
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(248, 249, 251, 0.7);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  z-index: 10;
  padding: 40px 24px;
}

/* PRO teaser badge in method-header (visible to free users) */
.method-header { position: relative; }
.method-header__teaser-badge {
  position: absolute;
  top: 12px;
  right: 16px;
  background: linear-gradient(135deg, #7243f2, #9b6dff);
  color: #fff;
  font-size: 10.5px;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 999px;
  letter-spacing: 0.4px;
  box-shadow: 0 2px 8px rgba(114, 67, 242, 0.3);
  user-select: none;
  -webkit-user-select: none;
}
/* Hide teaser badge for PRO users — JS adds .is-pro on body */
body.is-pro .method-header__teaser-badge { display: none; }

/* Method-header text protection (uncopyable) */
.method-header__text h3,
.method-header__text p {
  user-select: none;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
}
.method-header__text h3::selection,
.method-header__text p::selection { background: transparent; color: inherit; }

/* Method-card text also uncopyable */
.method-card__name,
.method-card__desc {
  user-select: none;
  -webkit-user-select: none;
}
.method-card__name::selection,
.method-card__desc::selection { background: transparent; color: inherit; }

.collision-lock-content {
  text-align: center;
  max-width: 380px;
  background: #fff;
  border-radius: 20px;
  padding: 40px 32px;
  box-shadow: 0 8px 32px rgba(0,0,0,0.08), 0 0 0 1px rgba(114, 67, 242, 0.1);
}

/* Same padlock as the calculators page (emoji 🔒, no tile) */
.collision-lock-icon {
  font-size: 2.75rem;
  line-height: 1;
  margin: 0 auto 14px;
  filter: drop-shadow(0 2px 6px rgba(0, 0, 0, 0.15));
}

.collision-lock-content h4 {
  font-size: 18px;
  font-weight: 800;
  color: #1d1729;
  margin: 0 0 8px 0;
  font-family: var(--font-heading, 'Montserrat', sans-serif);
}

.collision-lock-content p {
  font-size: 13px;
  color: #6b7280;
  line-height: 1.6;
  margin: 0 0 22px 0;
}

.collision-lock-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 32px;
  border-radius: 12px;
  background: linear-gradient(135deg, #7243f2, #9b6dff);
  color: #fff !important;
  font-weight: 700;
  font-size: 14px;
  text-decoration: none;
  transition: all 0.25s;
  box-shadow: 0 4px 16px rgba(114, 67, 242, 0.25);
}
.collision-lock-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(114, 67, 242, 0.35);
  filter: brightness(1.05);
}

/* ===== Δale color indication ===== */
.delta-warn { color: #c0392b; font-weight: 800; }
.delta-ok   { color: #1e7a34; font-weight: 800; }

/* =============================================
   METHOD 4: DELTA V — Violet / Royal Purple theme
   ============================================= */
:root {
  --dv-primary: #7c3aed;
  --dv-secondary: #a855f7;
  --dv-bg: #faf5ff;
  --dv-bg-hover: #f3e8ff;
  --dv-border: #e9d5ff;
  --dv-border-strong: #c4b5fd;
  --dv-gradient: linear-gradient(135deg, #7c3aed, #a855f7);
  --dv-glow: rgba(168, 85, 247, 0.18);
  --dv-text: #4c1d95;
  --dv-badge-bg: #f3e8ff;
}

/* Method card */
.method-card--deltav { position: relative; }
.method-card--deltav .method-card__icon {
  background: var(--dv-bg);
  border: 1px solid var(--dv-border);
}
.method-card--deltav.method-card--active {
  border-color: var(--dv-secondary);
  background: var(--dv-bg);
  box-shadow: 0 4px 20px var(--dv-glow), 0 0 0 1px var(--dv-border);
}
.method-card--deltav.method-card--active .method-card__icon {
  background: var(--dv-gradient);
  border-color: transparent;
  box-shadow: 0 4px 12px var(--dv-glow);
}
.method-card--deltav.method-card--active .method-card__icon svg { stroke: #fff; }
.method-card--deltav.method-card--active .method-card__name { color: var(--dv-primary); }

/* NEW badge on the Delta V card */
.method-card__badge-new {
  position: absolute;
  top: 12px;
  right: 12px;
  background: linear-gradient(135deg, #fb923c, #f97316);
  color: #fff;
  font-size: 9.5px;
  font-weight: 800;
  letter-spacing: 0.08em;
  padding: 3px 8px;
  border-radius: 999px;
  box-shadow: 0 2px 6px rgba(249, 115, 22, 0.35);
  z-index: 2;
}

/* Method header */
.method-header--deltav {
  background: var(--dv-bg);
  border: 1px solid var(--dv-border);
}
.method-header--deltav .method-header__num {
  background: var(--dv-gradient);
  box-shadow: 0 4px 14px var(--dv-glow);
  font-size: 22px;
}
.method-header--deltav .method-header__text h3 { color: var(--dv-primary); }
.method-header--deltav .method-header__text p { color: var(--dv-text); opacity: 0.72; }

/* Calculate button */
.calc-btn--deltav {
  background: var(--dv-gradient);
  box-shadow: 0 6px 20px var(--dv-glow);
}

/* Results panel header */
.results-panel--deltav { border: 1px solid var(--dv-border); }
.results-panel--deltav .results-panel__header { background: var(--dv-gradient); }

/* Scenario tabs */
.dv-scenarios {
  display: flex;
  border: 1.5px solid var(--dv-border);
  background: #fff;
  border-radius: 12px;
  overflow: hidden;
  margin: 0 0 20px;
}
.dv-scenario-tab {
  flex: 1;
  padding: 12px 14px;
  background: transparent;
  border: none;
  border-right: 1.5px solid var(--dv-border);
  font-family: var(--font-heading, 'Montserrat', sans-serif);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: #6b7280;
  cursor: pointer;
  transition: all 0.18s ease;
}
.dv-scenario-tab:last-child { border-right: none; }
.dv-scenario-tab:hover { background: var(--dv-bg); color: var(--dv-primary); }
.dv-scenario-tab--active {
  background: var(--dv-gradient);
  color: #fff;
}

/* Subtitle */
.dv-subtitle {
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--dv-primary);
  margin: 18px 0 10px;
  padding-bottom: 6px;
  border-bottom: 1px dashed var(--dv-border);
}

/* Radio group */
.dv-radio-group {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
  margin-bottom: 8px;
}
.dv-radio {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 9px 10px;
  border: 1.5px solid #e5e7eb;
  border-radius: 10px;
  background: #fff;
  font-size: 12px;
  font-weight: 600;
  text-align: center;
  cursor: pointer;
  transition: all 0.15s;
  color: #4b5563;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}
.dv-radio input { display: none; }
.dv-radio:hover { background: var(--dv-bg); }
.dv-radio:has(input:checked) {
  background: var(--dv-gradient);
  color: #fff;
  border-color: var(--dv-primary);
}

/* Mode tabs (auto / manual) */
.dv-mode-tabs {
  display: flex;
  border: 1.5px solid var(--dv-border);
  border-radius: 10px;
  overflow: hidden;
  margin-bottom: 10px;
  width: fit-content;
}
.dv-mode-tab {
  padding: 7px 14px;
  background: transparent;
  border: none;
  border-right: 1.5px solid var(--dv-border);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  cursor: pointer;
  color: #6b7280;
  transition: all 0.15s;
}
.dv-mode-tab:last-child { border-right: none; }
.dv-mode-tab:hover { background: var(--dv-bg); color: var(--dv-primary); }
.dv-mode-tab--active { background: var(--dv-gradient); color: #fff; }

.dv-mode-pane { display: none; }
.dv-mode-pane--active { display: block; }

/* Note */
.dv-note {
  font-size: 12.5px;
  color: var(--dv-text);
  background: var(--dv-bg);
  border-left: 3px solid var(--dv-secondary);
  padding: 8px 12px;
  border-radius: 6px;
  margin-top: 10px;
  line-height: 1.5;
}
.dv-faded { color: #8b7ea8; }

/* Input grid extension for 6 columns */
.input-grid--6 { grid-template-columns: repeat(6, 1fr); }

/* C row — slightly compact */
.dv-c-row .input-field input { padding: 8px 10px; font-size: 13px; }

/* Hidden helper */
.dv-hidden { display: none !important; }

/* Results grid */
.dv-results-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  border-top: 1.5px solid var(--dv-border);
  border-left: 1.5px solid var(--dv-border);
}
.dv-result-cell {
  border-right: 1.5px solid var(--dv-border);
  border-bottom: 1.5px solid var(--dv-border);
  padding: 16px 16px;
  background: #fff;
  position: relative;
}
.dv-result-cell--blank {
  background: transparent;
  border-color: transparent;
}
.dv-result-cell .dv-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 9.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: #9ca3af;
  margin-bottom: 6px;
}
.dv-result-cell .dv-symbol {
  font-family: 'Inter', sans-serif;
  font-style: italic;
  font-size: 13px;
  color: var(--dv-primary);
  margin-bottom: 4px;
  font-weight: 600;
}
.dv-result-cell .dv-value {
  font-family: 'Inter', sans-serif;
  font-weight: 700;
  font-size: 24px;
  color: #1d1729;
  line-height: 1.1;
  letter-spacing: -0.01em;
}
.dv-result-cell .dv-value.small { font-size: 18px; }
.dv-result-cell .dv-unit {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  color: #9ca3af;
  margin-top: 3px;
  letter-spacing: 0.05em;
}
.dv-result-cell.highlight {
  background: linear-gradient(135deg, #1d1729 0%, #2c2440 100%);
}
.dv-result-cell.highlight .dv-label,
.dv-result-cell.highlight .dv-unit { color: rgba(255,255,255,0.55); }
.dv-result-cell.highlight .dv-symbol { color: var(--dv-secondary); }
.dv-result-cell.highlight .dv-value { color: #fff; }
.dv-result-cell.mps2-tone .dv-symbol { color: #1e5b8a; }
.dv-result-cell.mps2-highlight {
  background: linear-gradient(135deg, #1e3a8a 0%, #1e5b8a 100%);
}
.dv-result-cell.mps2-highlight .dv-label,
.dv-result-cell.mps2-highlight .dv-unit { color: rgba(255,255,255,0.65); }
.dv-result-cell.mps2-highlight .dv-symbol { color: #93c5fd; }
.dv-result-cell.mps2-highlight .dv-value { color: #fff; }

/* SVG visualization wrap */
.dv-svg-wrap {
  background: #fff;
  border: 1.5px solid var(--dv-border);
  border-radius: 12px;
  padding: 14px;
  margin-top: 8px;
}
.dv-svg-wrap svg { width: 100%; height: auto; display: block; }

/* Legend */
.dv-legend {
  display: flex;
  gap: 18px;
  margin-top: 14px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 10.5px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: #6b7280;
  flex-wrap: wrap;
}
.dv-legend > div { display: flex; align-items: center; gap: 6px; }
.dv-swatch {
  display: inline-block;
  width: 18px;
  height: 3px;
  vertical-align: middle;
  border-radius: 2px;
}
.dv-swatch--mps1 { background: #7c3aed; height: 6px; }
.dv-swatch--mps2 { background: #1e5b8a; height: 6px; }
.dv-swatch--def  { background: #a855f7; height: 4px; }
.dv-swatch--v    { background: #15803d; height: 4px; }
.dv-swatch--u    { background: #b45309; height: 4px; }

/* Mobile responsive */
@media (max-width: 780px) {
  .dv-scenarios { flex-direction: column; }
  .dv-scenario-tab { border-right: none; border-bottom: 1.5px solid var(--dv-border); }
  .dv-scenario-tab:last-child { border-bottom: none; }
  .dv-radio-group { grid-template-columns: repeat(2, 1fr); }
  .input-grid--6 { grid-template-columns: repeat(3, 1fr); }
  .dv-results-grid { grid-template-columns: repeat(2, 1fr); }
  .dv-result-cell .dv-value { font-size: 20px; }
}