/* =================================================================
   MAMERI EXPORT — Material 3D Viewer & Photo Simulator
   Design System v1.0 — premium showroom aesthetic
   ================================================================= */

/* ── Custom properties ─────────────────────────────────────────── */
:root {
  --mv-bg:        #090807;
  --mv-surface:   #110F0D;
  --mv-border:    rgba(255,255,255,0.07);
  --mv-gold:      #C9A96E;
  --mv-gold-dim:  rgba(201,169,110,0.18);
  --mv-text:      rgba(255,255,255,0.82);
  --mv-muted:     rgba(255,255,255,0.38);
  --mv-ctrl-h:    48px;
  --mv-radius:    3px;
}

/* ── Section wrapper ────────────────────────────────────────────── */
.mv-section {
  background: var(--mv-bg);
  padding: clamp(72px, 9vw, 120px) 0;
}

.mv-section .container {
  max-width: 1320px;
  margin: 0 auto;
  padding: 0 clamp(20px, 4vw, 60px);
}

.mv-section-eyebrow {
  font-size: 0.56rem;
  font-weight: 700;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--mv-gold);
  margin-bottom: 14px;
}

.mv-section-title {
  font-size: clamp(1.6rem, 3.2vw, 2.8rem);
  font-weight: 300;
  letter-spacing: -0.015em;
  color: #fff;
  margin-bottom: 10px;
  text-transform: none;
  line-height: 1.15;
}

.mv-section-sub {
  font-size: clamp(0.82rem, 1.2vw, 0.95rem);
  font-weight: 300;
  color: var(--mv-muted);
  line-height: 1.75;
  max-width: 560px;
}

.mv-section-header {
  margin-bottom: clamp(36px, 5vw, 56px);
}

/* ── Master tab bar ─────────────────────────────────────────────── */
.mv-tab-bar {
  display: flex;
  gap: 0;
  border-bottom: 1px solid var(--mv-border);
  margin-bottom: 0;
}

.mv-tab {
  position: relative;
  padding: 14px 28px;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--mv-muted);
  background: none;
  border: none;
  cursor: pointer;
  transition: color 0.25s;
  white-space: nowrap;
}

.mv-tab::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--mv-gold);
  transform: scaleX(0);
  transition: transform 0.3s ease;
}

.mv-tab:hover { color: rgba(255,255,255,0.6); }

.mv-tab.active {
  color: var(--mv-gold);
}

.mv-tab.active::after {
  transform: scaleX(1);
}

/* ── Tab panels ─────────────────────────────────────────────────── */
.mv-panel {
  display: none;
}
.mv-panel.active {
  display: block;
}

/* =====================================================================
   MODULE 1 & 2 — THREE.JS VIEWER
   ===================================================================== */

.mv-viewer-wrap {
  position: relative;
  background: var(--mv-surface);
  overflow: hidden;
}

.mv-canvas-container {
  position: relative;
  width: 100%;
  height: clamp(340px, 55vw, 640px);
  background: #090807;
  overflow: hidden;
}

.mv-canvas-container canvas {
  width: 100% !important;
  height: 100% !important;
  display: block;
  touch-action: none;
}

/* Loading overlay */
.mv-loader {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: var(--mv-bg);
  z-index: 10;
  transition: opacity 0.6s ease;
}

.mv-loader.hidden {
  opacity: 0;
  pointer-events: none;
}

.mv-loader-ring {
  width: 44px;
  height: 44px;
  border: 2px solid rgba(201,169,110,0.15);
  border-top-color: var(--mv-gold);
  border-radius: 50%;
  animation: mv-spin 0.9s linear infinite;
  margin-bottom: 18px;
}

@keyframes mv-spin {
  to { transform: rotate(360deg); }
}

.mv-loader-text {
  font-size: 0.62rem;
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--mv-muted);
}

/* WebGL fallback */
.mv-fallback {
  display: none;
  position: absolute;
  inset: 0;
  background: var(--mv-surface);
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 40px;
  text-align: center;
}
.mv-fallback.visible { display: flex; }

.mv-fallback img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  position: absolute;
  inset: 0;
  opacity: 0.5;
}

.mv-fallback-msg {
  position: relative;
  z-index: 1;
  font-size: 0.78rem;
  color: var(--mv-muted);
}

/* ── 3D viewer bottom bar ────────────────────────────────────────── */
.mv-viewer-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 20px;
  background: rgba(0,0,0,0.35);
  border-top: 1px solid var(--mv-border);
  flex-wrap: wrap;
}

/* Scene selector chips */
.mv-scene-list {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.mv-scene-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 14px;
  font-size: 0.6rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--mv-muted);
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--mv-border);
  border-radius: 2px;
  cursor: pointer;
  transition: color 0.2s, border-color 0.2s, background 0.2s;
  white-space: nowrap;
}

.mv-scene-btn svg {
  width: 13px;
  height: 13px;
  opacity: 0.6;
  flex-shrink: 0;
}

.mv-scene-btn:hover {
  color: rgba(255,255,255,0.65);
  border-color: rgba(255,255,255,0.14);
}

.mv-scene-btn.active {
  color: var(--mv-gold);
  border-color: rgba(201,169,110,0.4);
  background: var(--mv-gold-dim);
}

.mv-scene-btn.active svg { opacity: 1; }

/* Control buttons */
.mv-ctrl-group {
  display: flex;
  gap: 8px;
}

.mv-ctrl-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--mv-border);
  border-radius: 2px;
  cursor: pointer;
  color: var(--mv-muted);
  transition: color 0.2s, border-color 0.2s;
  flex-shrink: 0;
}

.mv-ctrl-btn svg { width: 16px; height: 16px; }

.mv-ctrl-btn:hover {
  color: rgba(255,255,255,0.7);
  border-color: rgba(255,255,255,0.16);
}

/* Hint text on canvas (desktop) */
.mv-canvas-hint {
  position: absolute;
  bottom: 14px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 0.58rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.22);
  pointer-events: none;
  white-space: nowrap;
  z-index: 5;
  transition: opacity 0.5s;
}
.mv-canvas-hint.hidden { opacity: 0; }

/* Surface label overlay (appears on environment switch) */
.mv-scene-label {
  position: absolute;
  top: 18px;
  left: 20px;
  z-index: 5;
  pointer-events: none;
}

.mv-scene-label-text {
  display: inline-block;
  font-size: 0.56rem;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--mv-gold);
  border: 1px solid rgba(201,169,110,0.3);
  padding: 5px 10px;
  background: rgba(9,8,7,0.72);
  backdrop-filter: blur(4px);
}

/* =====================================================================
   MODULE 3 — PHOTO SIMULATOR
   ===================================================================== */

.mv-sim-wrap {
  background: var(--mv-surface);
}

/* Step indicator */
.mv-sim-steps {
  display: flex;
  align-items: center;
  gap: 0;
  padding: 20px 24px;
  border-bottom: 1px solid var(--mv-border);
  overflow-x: auto;
}

.mv-sim-step {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.mv-step-num {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  border: 1px solid var(--mv-border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.6rem;
  font-weight: 700;
  color: var(--mv-muted);
  transition: all 0.3s;
}

.mv-step-label {
  font-size: 0.62rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--mv-muted);
  transition: color 0.3s;
}

.mv-sim-step.active .mv-step-num {
  border-color: var(--mv-gold);
  background: var(--mv-gold-dim);
  color: var(--mv-gold);
}
.mv-sim-step.active .mv-step-label { color: rgba(255,255,255,0.75); }
.mv-sim-step.done .mv-step-num {
  border-color: rgba(201,169,110,0.5);
  background: rgba(201,169,110,0.12);
  color: var(--mv-gold);
}

.mv-step-sep {
  width: 28px;
  height: 1px;
  background: var(--mv-border);
  margin: 0 4px;
  flex-shrink: 0;
}

/* Main sim layout */
.mv-sim-body {
  display: grid;
  grid-template-columns: 1fr 280px;
  min-height: 520px;
}

@media (max-width: 860px) {
  .mv-sim-body { grid-template-columns: 1fr; }
}

/* Canvas area */
.mv-sim-canvas-area {
  position: relative;
  background: #0C0B09;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 460px;
  overflow: hidden;
  cursor: crosshair;
}

.mv-sim-canvas-area.mode-adjust { cursor: default; }
.mv-sim-canvas-area.mode-compare { cursor: ew-resize; }

#mv-sim-canvas {
  max-width: 100%;
  max-height: 100%;
  display: block;
  user-select: none;
}

/* Upload drop zone */
.mv-upload-zone {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  border: 1px dashed rgba(201,169,110,0.25);
  margin: 24px;
  cursor: pointer;
  transition: border-color 0.25s, background 0.25s;
}

.mv-upload-zone:hover,
.mv-upload-zone.drag-over {
  border-color: rgba(201,169,110,0.55);
  background: rgba(201,169,110,0.04);
}

.mv-upload-zone.hidden { display: none; }

.mv-upload-icon {
  width: 48px;
  height: 48px;
  color: var(--mv-gold);
  opacity: 0.5;
}

.mv-upload-label {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--mv-muted);
}

.mv-upload-hint {
  font-size: 0.68rem;
  font-weight: 300;
  color: rgba(255,255,255,0.22);
}

.mv-upload-btn {
  padding: 9px 22px;
  font-size: 0.6rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--mv-gold);
  border: 1px solid rgba(201,169,110,0.35);
  background: transparent;
  cursor: pointer;
  transition: background 0.2s, border-color 0.2s;
}
.mv-upload-btn:hover {
  background: var(--mv-gold-dim);
  border-color: rgba(201,169,110,0.6);
}

/* Polygon drawing overlay */
.mv-poly-overlay {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

/* Compare slider */
.mv-compare-slider {
  position: absolute;
  top: 0;
  bottom: 0;
  width: 2px;
  background: rgba(255,255,255,0.7);
  cursor: ew-resize;
  z-index: 20;
  display: none;
}

.mv-compare-slider::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 2px 12px rgba(0,0,0,0.4);
}

.mv-compare-slider::after {
  content: '◀ ▶';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 0.55rem;
  color: #111;
  font-weight: 700;
  letter-spacing: 0.05em;
  white-space: nowrap;
}

.mv-compare-slider.visible { display: block; }

/* ── Simulator sidebar ───────────────────────────────────────────── */
.mv-sim-sidebar {
  border-left: 1px solid var(--mv-border);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 24px;
  overflow-y: auto;
  background: #0D0B09;
}

@media (max-width: 860px) {
  .mv-sim-sidebar {
    border-left: none;
    border-top: 1px solid var(--mv-border);
  }
}

.mv-sidebar-section {}

.mv-sidebar-label {
  font-size: 0.56rem;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--mv-gold);
  margin-bottom: 14px;
  display: block;
}

/* Surface type selector */
.mv-surface-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.mv-surface-btn {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  font-size: 0.65rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  color: var(--mv-muted);
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--mv-border);
  border-radius: 2px;
  cursor: pointer;
  transition: all 0.2s;
  text-align: left;
}

.mv-surface-btn svg { width: 14px; height: 14px; flex-shrink: 0; opacity: 0.5; }

.mv-surface-btn:hover {
  color: rgba(255,255,255,0.65);
  border-color: rgba(255,255,255,0.12);
}

.mv-surface-btn.active {
  color: var(--mv-gold);
  border-color: rgba(201,169,110,0.35);
  background: var(--mv-gold-dim);
}
.mv-surface-btn.active svg { opacity: 1; }

/* Sliders */
.mv-slider-group {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.mv-slider-row {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.mv-slider-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.mv-slider-name {
  font-size: 0.6rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--mv-muted);
}

.mv-slider-val {
  font-size: 0.6rem;
  font-weight: 600;
  color: var(--mv-gold);
  min-width: 28px;
  text-align: right;
}

/* Range input styling */
input[type="range"].mv-range {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 3px;
  background: rgba(255,255,255,0.1);
  border-radius: 2px;
  outline: none;
  cursor: pointer;
}

input[type="range"].mv-range::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--mv-gold);
  cursor: pointer;
  box-shadow: 0 0 6px rgba(201,169,110,0.4);
}

input[type="range"].mv-range::-moz-range-thumb {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--mv-gold);
  cursor: pointer;
  border: none;
}

/* Sidebar action buttons */
.mv-sim-actions {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: auto;
}

.mv-sim-btn {
  padding: 11px 16px;
  font-size: 0.6rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  cursor: pointer;
  border-radius: 2px;
  transition: all 0.2s;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  border: 1px solid transparent;
}

.mv-sim-btn svg { width: 14px; height: 14px; flex-shrink: 0; }

.mv-sim-btn-primary {
  background: var(--mv-gold);
  color: #0A0908;
  border-color: var(--mv-gold);
}
.mv-sim-btn-primary:hover { background: #d4b47c; }

.mv-sim-btn-outline {
  background: transparent;
  color: var(--mv-muted);
  border-color: var(--mv-border);
}
.mv-sim-btn-outline:hover {
  color: rgba(255,255,255,0.65);
  border-color: rgba(255,255,255,0.15);
}

.mv-sim-btn-ghost {
  background: transparent;
  color: rgba(201,169,110,0.7);
  border-color: rgba(201,169,110,0.2);
}
.mv-sim-btn-ghost:hover {
  color: var(--mv-gold);
  border-color: rgba(201,169,110,0.4);
  background: var(--mv-gold-dim);
}

.mv-sim-btn:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

/* Polygon instruction overlay */
.mv-poly-instruction {
  position: absolute;
  bottom: 16px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 0.6rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--mv-gold);
  background: rgba(9,8,7,0.82);
  backdrop-filter: blur(4px);
  padding: 8px 18px;
  border: 1px solid rgba(201,169,110,0.25);
  pointer-events: none;
  white-space: nowrap;
  z-index: 10;
  display: none;
}
.mv-poly-instruction.visible { display: block; }

/* =====================================================================
   CTA STRIP (bottom of viewer section)
   ===================================================================== */

.mv-cta-strip {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 28px 0 0;
  border-top: 1px solid var(--mv-border);
  margin-top: clamp(32px, 4vw, 52px);
  flex-wrap: wrap;
}

.mv-cta-strip-label {
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--mv-muted);
}

.mv-cta-strip-btns {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

/* =====================================================================
   RESPONSIVE
   ===================================================================== */

@media (max-width: 768px) {
  .mv-tab { padding: 12px 18px; font-size: 0.62rem; }
  .mv-scene-btn { padding: 6px 10px; font-size: 0.56rem; }
  .mv-canvas-container { height: clamp(280px, 60vw, 440px); }
  .mv-viewer-bar {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }
  .mv-scene-list { gap: 6px; }
  .mv-cta-strip { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 480px) {
  .mv-tab-bar { overflow-x: auto; }
  .mv-sim-steps { gap: 0; }
  .mv-step-label { display: none; }
  .mv-step-sep { width: 16px; }
  .mv-upload-label { font-size: 0.65rem; }
}

/* =====================================================================
   ANIMATION UTILITIES
   ===================================================================== */

.mv-fade-in {
  animation: mv-fadeIn 0.5s ease forwards;
}

@keyframes mv-fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

.mv-pulse {
  animation: mv-pulse 2s ease-in-out infinite;
}

@keyframes mv-pulse {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0.5; }
}