/* ═══════════════════════════════════════════════════════
   ReformaIA — Estilos
   Estética: luxury editorial · crema & negro · tipografía serif
═══════════════════════════════════════════════════════ */

:root {
  --cream:     #FFFFFF;
  --cream-dk:  #EBF4FC;
  --ink:       #1A1612;
  --ink-soft:  #4A3F35;
  --gold:      #3e8fd8;
  --gold-lt:   #6aaee0;
  --rust:      #8B4513;
  --sage:      #6B7B5E;
  --border:    #cce3f5;
  --shadow:    rgba(26,22,18,0.12);
  --radius:    4px;
  --radius-lg: 12px;
  --font-serif: 'Playfair Display', Georgia, serif;
  --font-sans:  'DM Sans', system-ui, sans-serif;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--cream);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.6;
  min-height: 100vh;
}

/* ─────── HEADER ─────── */
.site-header {
  background: var(--ink);
  color: var(--cream);
  text-align: center;
  padding: 2.5rem 1rem 2rem;
  position: relative;
  overflow: hidden;
}

.site-header::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--gold), transparent);
}

.logo {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  margin-bottom: .4rem;
}

.logo-mark {
  color: var(--gold);
  font-size: 1.6rem;
}

.logo-text {
  font-family: var(--font-serif);
  font-size: 2.2rem;
  font-weight: 400;
  letter-spacing: .04em;
}

.logo-text em {
  color: var(--gold);
  font-style: italic;
}

.tagline {
  color: #9A9188;
  font-size: .85rem;
  letter-spacing: .12em;
  text-transform: uppercase;
}

/* ─────── MAIN LAYOUT ─────── */
main {
  max-width: 860px;
  margin: 0 auto;
  padding: 2.5rem 1.5rem 4rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

/* ─────── STEP CARDS ─────── */
.step-card {
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem 2.5rem;
  position: relative;
  box-shadow: 0 2px 16px var(--shadow);
  animation: fadeUp .4s ease both;
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}

.step-number {
  position: absolute;
  top: 1.5rem;
  right: 1.8rem;
  font-family: var(--font-serif);
  font-size: 3.5rem;
  font-weight: 700;
  color: var(--cream-dk);
  line-height: 1;
  user-select: none;
}

.step-card h2 {
  font-family: var(--font-serif);
  font-size: 1.55rem;
  font-weight: 400;
  margin-bottom: .4rem;
}

.step-desc {
  color: var(--ink-soft);
  font-size: .85rem;
  margin-bottom: 1.5rem;
}

/* ─────── UPLOAD ─────── */
.upload-zone {
  border: 2px dashed var(--border);
  border-radius: var(--radius-lg);
  padding: 3rem 2rem;
  text-align: center;
  cursor: pointer;
  transition: border-color .25s, background .25s;
}

.upload-zone:hover,
.upload-zone.dragover {
  border-color: var(--gold);
  background: #f0f8ff;
}

.upload-icon {
  font-size: 2.5rem;
  margin-bottom: .8rem;
  opacity: .5;
}

.link-btn {
  background: none;
  border: none;
  color: var(--gold);
  cursor: pointer;
  font-family: inherit;
  font-size: inherit;
  font-weight: 500;
  text-decoration: underline;
  padding: 0;
}

.image-preview {
  text-align: center;
}

.image-preview img {
  max-width: 100%;
  max-height: 400px;
  border-radius: var(--radius-lg);
  box-shadow: 0 4px 24px var(--shadow);
  object-fit: contain;
}

/* ─────── REGION GRID ─────── */
.region-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.region-card {
  background: var(--cream);
  border: 2px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.8rem 1.5rem;
  text-align: center;
  cursor: pointer;
  transition: all .2s;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: .4rem;
}

.region-card:hover,
.region-card.selected {
  border-color: var(--gold);
  background: #f0f8ff;
  box-shadow: 0 0 0 3px rgba(184,150,62,.15);
}

.region-icon {
  font-size: 2.2rem;
  display: block;
  color: var(--ink-soft);
}

.region-label {
  font-family: var(--font-serif);
  font-size: 1.2rem;
}

.region-sub {
  font-size: .78rem;
  color: var(--ink-soft);
}

/* ─────── MATERIAL GRID ─────── */
.material-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  gap: .85rem;
  margin-bottom: 1.5rem;
}

.material-card {
  border: 2px solid var(--border);
  border-radius: var(--radius-lg);
  padding: .6rem .6rem .9rem;
  cursor: pointer;
  text-align: center;
  font-size: .82rem;
  font-family: var(--font-sans);
  font-weight: 500;
  background: #ffffff;
  transition: all .2s;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: .5rem;
}

.material-card:hover,
.material-card.selected {
  border-color: var(--gold);
  box-shadow: 0 0 0 3px rgba(184,150,62,.15);
}

.mat-swatch {
  width: 100%;
  height: 60px;
  border-radius: calc(var(--radius-lg) - 4px);
  background-size: cover;
}

.swatch-madera   { background-image: repeating-linear-gradient(5deg, #8B5E3C 0px, #8B5E3C 3px, #7A4E2F 3px, #7A4E2F 8px, #8B5E3C 8px, #8B5E3C 14px); }
.swatch-parquet  { background-image: repeating-conic-gradient(#B4763A 0% 25%, #8B5A28 25% 50%); background-size: 16px 16px; }
.swatch-ceramica { background-image: repeating-conic-gradient(#D9CFC4 0% 25%, #C2B9AE 25% 50%); background-size: 20px 20px; }
.swatch-marmol   {
  background: linear-gradient(135deg, #F0EBEA 0%, #D4CCC8 25%, #F0EBEA 50%, #BFB7B3 75%, #EDE8E6 100%);
}
.swatch-cemento  { background: linear-gradient(160deg, #9E9E9E, #BDBDBD, #9E9E9E); }

/* ─────── COLOR PALETTE ─────── */
.color-palette {
  display: flex;
  flex-wrap: wrap;
  gap: .6rem;
  margin-bottom: 1rem;
}

.color-swatch {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 3px solid transparent;
  cursor: pointer;
  transition: transform .15s, box-shadow .15s;
  box-shadow: 0 2px 6px var(--shadow);
}

.color-swatch:hover { transform: scale(1.12); }
.color-swatch.selected {
  border-color: var(--ink);
  box-shadow: 0 0 0 2px var(--gold);
}

.color-custom {
  display: flex;
  align-items: center;
  gap: .8rem;
  margin-bottom: 1.5rem;
  font-size: .85rem;
  color: var(--ink-soft);
}

.color-custom input[type="color"] {
  width: 44px;
  height: 44px;
  border: none;
  border-radius: 50%;
  cursor: pointer;
  padding: 0;
  box-shadow: 0 2px 6px var(--shadow);
}

#hex-display {
  font-family: monospace;
  font-size: .9rem;
  background: var(--cream);
  padding: .25rem .6rem;
  border-radius: 4px;
  border: 1px solid var(--border);
}

/* ─────── SD TOGGLE ─────── */
.sd-toggle {
  margin: .8rem 0 1.2rem;
}

.toggle-label {
  display: flex;
  align-items: center;
  gap: .8rem;
  cursor: pointer;
  font-size: .83rem;
  color: var(--ink-soft);
}

.toggle-label input { display: none; }

.toggle-track {
  width: 42px;
  height: 24px;
  background: var(--border);
  border-radius: 12px;
  position: relative;
  transition: background .2s;
  flex-shrink: 0;
}

.toggle-track::after {
  content: '';
  position: absolute;
  top: 3px; left: 3px;
  width: 18px; height: 18px;
  background: #ffffff;
  border-radius: 50%;
  transition: transform .2s;
  box-shadow: 0 1px 4px var(--shadow);
}

.toggle-label input:checked + .toggle-track { background: var(--gold); }
.toggle-label input:checked + .toggle-track::after { transform: translateX(18px); }

/* ─────── BUTTONS ─────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  padding: .7rem 1.6rem;
  border-radius: var(--radius);
  font-family: var(--font-sans);
  font-size: .88rem;
  font-weight: 500;
  cursor: pointer;
  border: none;
  transition: all .2s;
  text-decoration: none;
}

.btn-primary {
  background: var(--ink);
  color: var(--cream);
  letter-spacing: .05em;
}

.btn-primary:hover { background: #2E2620; box-shadow: 0 4px 16px var(--shadow); }

.btn-ghost {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--ink);
}

.btn-ghost:hover { border-color: var(--ink); background: var(--cream); }

.btn-sm { padding: .4rem 1rem; font-size: .8rem; }

.btn-apply {
  margin-top: .5rem;
  width: 100%;
  justify-content: center;
  padding: .9rem;
  font-size: .95rem;
  letter-spacing: .08em;
}

/* ─────── LOADING ─────── */
.step-card#step-loading {
  text-align: center;
  padding: 3rem;
}

.loading-anim {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.2rem;
}

.spinner {
  width: 52px;
  height: 52px;
  border: 3px solid var(--cream-dk);
  border-top-color: var(--gold);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

#loading-msg {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  color: var(--ink-soft);
  font-style: italic;
}

.progress-bar {
  width: 260px;
  height: 4px;
  background: var(--cream-dk);
  border-radius: 2px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--gold), var(--gold-lt));
  border-radius: 2px;
  transition: width .4s ease;
  width: 0%;
}

/* ─────── RESULTS ─────── */
.compare-container {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 1rem;
  margin-bottom: 1.5rem;
  align-items: center;
}

.compare-panel {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 4px 20px var(--shadow);
}

.compare-panel img {
  width: 100%;
  display: block;
  object-fit: cover;
  max-height: 280px;
}

.compare-label {
  position: absolute;
  top: .6rem;
  left: .6rem;
  background: rgba(26,22,18,.7);
  color: #fff;
  font-size: .7rem;
  letter-spacing: .15em;
  padding: .2rem .6rem;
  border-radius: 3px;
  font-weight: 500;
}

.compare-divider {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: .4rem;
}

.divider-line {
  width: 1px;
  height: 40px;
  background: var(--border);
}

.divider-handle {
  font-size: 1.2rem;
  color: var(--ink-soft);
}

/* ─────── SLIDER COMPARE ─────── */
.slider-compare {
  margin-bottom: 1.5rem;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 4px 24px var(--shadow);
  user-select: none;
}

.sc-track {
  position: relative;
  cursor: ew-resize;
  line-height: 0;
}

.sc-img {
  display: block;
  width: 100%;
  max-height: 460px;
  object-fit: cover;
}

.sc-before { position: relative; }

.sc-overlay {
  position: absolute;
  top: 0; right: 0; bottom: 0;
  width: 50%;
  overflow: hidden;
}

.sc-overlay .sc-after {
  position: absolute;
  top: 0; right: 0;
  height: 100%;
  width: auto;
  max-width: none;
}

.sc-handle {
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0;
  pointer-events: none;
  z-index: 10;
}

.sc-handle-line {
  flex: 1;
  width: 2px;
  background: #ffffff;
  opacity: .9;
}

.sc-handle-circle {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: .9rem;
  box-shadow: 0 2px 12px rgba(0,0,0,.3);
  flex-shrink: 0;
}

.sc-label {
  position: absolute;
  bottom: .7rem;
  background: rgba(26,22,18,.65);
  color: #fff;
  font-size: .7rem;
  letter-spacing: .15em;
  padding: .2rem .6rem;
  border-radius: 3px;
  font-weight: 500;
  pointer-events: none;
}

.sc-label-left  { left: .7rem; }
.sc-label-right { right: .7rem; }

/* ─────── METHOD BADGE ─────── */
.method-badge {
  font-size: .78rem;
  color: var(--ink-soft);
  text-align: center;
  margin-bottom: 1rem;
  font-style: italic;
}

/* ─────── RESULT ACTIONS ─────── */
.result-actions {
  display: flex;
  gap: .8rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 1.5rem;
}

/* ─────── MASK PREVIEW ─────── */
.mask-preview {
  border-top: 1px solid var(--border);
  padding-top: 1.2rem;
}

.mask-title {
  font-size: .78rem;
  color: var(--ink-soft);
  text-transform: uppercase;
  letter-spacing: .1em;
  margin-bottom: .6rem;
}

.mask-preview img {
  max-width: 100%;
  border-radius: var(--radius-lg);
  box-shadow: 0 2px 12px var(--shadow);
}

/* ─────── TOAST ─────── */
.toast {
  position: fixed;
  bottom: 1.5rem;
  left: 50%;
  transform: translateX(-50%);
  background: #333;
  color: #fff;
  padding: .8rem 1.4rem;
  border-radius: var(--radius-lg);
  display: flex;
  gap: 1rem;
  align-items: center;
  font-size: .88rem;
  z-index: 9999;
  box-shadow: 0 4px 20px rgba(0,0,0,.3);
  animation: toastIn .3s ease;
}

.toast button {
  background: none;
  border: none;
  color: #ccc;
  cursor: pointer;
  font-size: 1rem;
  line-height: 1;
}

@keyframes toastIn {
  from { opacity: 0; transform: translate(-50%, 20px); }
  to   { opacity: 1; transform: translate(-50%, 0); }
}

/* ─────── FOOTER ─────── */
footer {
  text-align: center;
  padding: 2rem 1rem;
  color: var(--ink-soft);
  font-size: .78rem;
  border-top: 1px solid var(--border);
  letter-spacing: .06em;
}

/* ─────── UTILITIES ─────── */
.hidden { display: none !important; }

/* ─────── RESPONSIVE ─────── */
@media (max-width: 600px) {
  .step-card { padding: 1.5rem 1.2rem; }
  .compare-container { grid-template-columns: 1fr; }
  .compare-divider { flex-direction: row; }
  .divider-line { width: 40px; height: 1px; }
  .region-grid { grid-template-columns: 1fr 1fr; }
  .material-grid { grid-template-columns: repeat(3, 1fr); }
}

/* ─────── MODE TABS ─────── */
.mode-tabs {
  display: flex;
  justify-content: center;
  gap: .5rem;
  margin-top: 1.2rem;
}

.mode-tab {
  background: transparent;
  border: 1px solid rgba(255,255,255,0.2);
  color: #9A9188;
  padding: .45rem 1.4rem;
  border-radius: 20px;
  font-family: var(--font-sans);
  font-size: .82rem;
  letter-spacing: .08em;
  cursor: pointer;
  transition: all .2s;
}

.mode-tab:hover { border-color: var(--gold); color: var(--gold-lt); }
.mode-tab.active { background: var(--gold); border-color: var(--gold); color: var(--ink); font-weight: 600; }

/* ─────── REFERENCE GRID ─────── */
.ref-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: .85rem;
  margin-bottom: 1.5rem;
}

.ref-card {
  border: 2px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1rem .8rem;
  cursor: pointer;
  text-align: center;
  background: #ffffff;
  transition: all .2s;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: .3rem;
}

.ref-card:hover, .ref-card.selected {
  border-color: var(--gold);
  box-shadow: 0 0 0 3px rgba(184,150,62,.15);
}

.ref-icon { font-size: 1.8rem; }
.ref-label { font-weight: 500; font-size: .85rem; }
.ref-sub { font-size: .72rem; color: var(--ink-soft); }

/* ─────── REF INPUTS ─────── */
.ref-inputs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-bottom: 1.2rem;
}

.ref-input-group {
  display: flex;
  flex-direction: column;
  gap: .4rem;
}

.ref-input-group label {
  font-size: .82rem;
  color: var(--ink-soft);
  font-weight: 500;
}

.hint { font-weight: 400; color: #aaa; }

.ref-input-group input {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: .55rem .8rem;
  font-family: var(--font-sans);
  font-size: .95rem;
  transition: border-color .2s;
}

.ref-input-group input:focus {
  outline: none;
  border-color: var(--gold);
}

/* ─────── DIMS GRID ─────── */
.dims-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: .8rem;
  margin-bottom: 1.5rem;
}

.dim-card {
  background: var(--cream);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1rem;
  text-align: center;
}

.dim-value {
  font-family: var(--font-serif);
  font-size: 1.6rem;
  color: var(--gold);
  display: block;
  line-height: 1.1;
}

.dim-unit {
  font-size: .75rem;
  color: var(--ink-soft);
  display: block;
  margin-bottom: .2rem;
}

.dim-label {
  font-size: .78rem;
  color: var(--ink-soft);
  text-transform: uppercase;
  letter-spacing: .08em;
}

/* ─────── MEAS COMPARE ─────── */
.meas-compare {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-bottom: 1.2rem;
}

.meas-compare .compare-panel img {
  max-height: 340px;
  object-fit: contain;
}

@media (max-width: 600px) {
  .ref-inputs { grid-template-columns: 1fr; }
  .meas-compare { grid-template-columns: 1fr; }
  .ref-grid { grid-template-columns: repeat(2, 1fr); }
}