/* ─── Variables ─────────────────────────────────────────────────── */
:root {
  --brand:        #D6462F;
  --brand-hover:  #c03d28;
  --brand-border: rgba(214,70,47,0.5);
  --brand-glow:   rgba(214,70,47,0.08);
  --slate-50:     #f8fafc;
  --slate-100:    #f1f5f9;
  --slate-200:    #e2e8f0;
  --slate-300:    #cbd5e1;
  --slate-400:    #94a3b8;
  --slate-500:    #64748b;
  --slate-600:    #475569;
  --slate-700:    #334155;
  --slate-800:    #1e293b;
  --sky-500:      #0ea5e9;
  --sky-600:      #0284c7;
  --amber-400:    #fbbf24;
  --amber-500:    #f59e0b;
  --rose-400:     #fb7185;
  --rose-500:     #ef4444;
  --font-playfair: 'Playfair Display', serif;
  --font-lato:     'Lato', sans-serif;
  --font-lovelo:   'Montserrat', sans-serif;
}

/* ─── Reset & base ───────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; }
[hidden] { display: none !important; }

body {
  font-family: var(--font-lato);
  background-color: #B7D8DA;
  margin: 0;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* ─── Font helpers ───────────────────────────────────────────────── */
.font-playfair { font-family: var(--font-playfair); }
.font-lato     { font-family: var(--font-lato); }
.font-lovelo   { font-family: var(--font-lovelo); letter-spacing: 0.1em; }

/* ─── Utility classes required by JS toggle calls ───────────────── */
.hidden             { display: none !important; }
.animate-pulse      { animation: pulse 2s cubic-bezier(0.4,0,0.6,1) infinite; }
.animate-spin       { animation: spin 1s linear infinite; }
.opacity-40         { opacity: 0.4; }
.opacity-50         { opacity: 0.5; }
.opacity-75         { opacity: 0.75; }
.cursor-not-allowed { cursor: not-allowed !important; }
.bg-sky-500         { background-color: var(--sky-500) !important; }
.border-sky-600     { border-color: var(--sky-600) !important; }
.bg-amber-400       { background-color: var(--amber-400) !important; }
.border-amber-500   { border-color: var(--amber-500) !important; }
.text-white         { color: #fff !important; }
.bg-white           { background-color: #fff !important; }
.text-slate-500     { color: var(--slate-500) !important; }
.border-slate-200   { border-color: var(--slate-200) !important; }

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0.5; }
}
@keyframes spin {
  from { transform: rotate(0deg); }
  to   { transform: rotate(360deg); }
}

/* ─── Header ────────────────────────────────────────────────────── */
.site-header {
  background: white;
  box-shadow: 0 1px 3px rgba(0,0,0,0.08);
}
.header-inner {
  max-width: 72rem;
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.header-spacer { width: 8rem; }
.site-logo { height: 6rem; object-fit: contain; display: block; }
.nav-link {
  font-family: var(--font-lovelo);
  text-transform: uppercase;
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--slate-500);
  text-decoration: none;
  transition: color 0.2s;
}
.nav-link:hover { color: var(--slate-800); }

/* ─── Main layout ───────────────────────────────────────────────── */
.app-main {
  flex: 1;
  max-width: 72rem;
  margin: 0 auto;
  width: 100%;
  padding: 2.5rem 2rem 4rem;
}
.app-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2.5rem;
  align-items: start;
}
.left-column,
.right-column {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

/* ─── Cards ─────────────────────────────────────────────────────── */
.card {
  background: white;
  border: 1px solid var(--brand-border);
  border-radius: 20px;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.card-title {
  font-family: var(--font-lovelo);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-size: 0.68rem;
  font-weight: 700;
  color: var(--brand);
  display: block;
}
.card-divider {
  border: none;
  border-top: 1px solid var(--slate-100);
  margin: 0;
}

/* ─── Image panels ──────────────────────────────────────────────── */
#original-container,
#generated-container {
  aspect-ratio: 1 / 1;
  width: 100%;
}
.img-container {
  position: relative;
  width: 100%;
  background: var(--slate-50);
  border-radius: 0.75rem;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--slate-100);
}
.img-display {
  width: 100%;
  height: 100%;
  object-fit: contain;
  pointer-events: none;
}
.img-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  color: var(--slate-300);
}
.img-placeholder svg { width: 3rem; height: 3rem; }
.placeholder-text {
  font-family: var(--font-lato);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.img-canvas {
  position: absolute;
  inset: 0;
  z-index: 10;
  width: 100%;
  height: 100%;
  pointer-events: none;
}
.loading-spinner {
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}
.spinner-circle {
  width: 3rem;
  height: 3rem;
  border-radius: 50%;
  border: 2px solid var(--slate-200);
  border-top-color: var(--brand);
  animation: spin 1s linear infinite;
}
.spinner-text {
  font-family: var(--font-lato);
  color: var(--slate-400);
  font-size: 0.875rem;
  font-style: italic;
}

/* ─── Buttons ───────────────────────────────────────────────────── */
.btn-upload,
.btn-download {
  font-family: var(--font-lovelo);
  background: var(--slate-800);
  color: white;
  border: none;
  padding: 0.75rem 2rem;
  border-radius: 9999px;
  box-shadow: 0 1px 2px rgba(0,0,0,0.1);
  cursor: pointer;
  text-transform: uppercase;
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  align-self: center;
  transition: background 0.2s;
}
.btn-upload:hover,
.btn-download:hover:not(:disabled) { background: #334155; }
.btn-download:disabled { opacity: 0.4; cursor: not-allowed; }

.btn-apply {
  width: 100%;
  font-family: var(--font-lovelo);
  background: var(--brand);
  color: white;
  border: none;
  padding: 1rem;
  border-radius: 0.75rem;
  box-shadow: 0 1px 2px rgba(0,0,0,0.1);
  cursor: pointer;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-size: 0.875rem;
  margin-top: 0.5rem;
  transition: background 0.2s;
}
.btn-apply:hover:not(:disabled) { background: var(--brand-hover); }
.btn-apply:disabled { opacity: 0.4; cursor: not-allowed; }

.btn-remove {
  flex: 1;
  font-family: var(--font-lovelo);
  background: var(--brand);
  color: white;
  border: none;
  padding: 0.75rem;
  border-radius: 0.75rem;
  cursor: pointer;
  text-transform: uppercase;
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  transition: background 0.2s;
}
.btn-remove:hover:not(:disabled) { background: var(--brand-hover); }
.btn-remove:disabled { opacity: 0.3; cursor: not-allowed; }

.btn-brush {
  flex: 1;
  font-family: var(--font-lovelo);
  background: var(--slate-50);
  color: var(--slate-500);
  border: 1px solid var(--slate-200);
  padding: 0.75rem;
  border-radius: 0.75rem;
  cursor: pointer;
  text-transform: uppercase;
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  transition: border-color 0.2s, background 0.2s, color 0.2s;
}
.btn-brush:hover { border-color: rgba(214,70,47,0.5); }

.btn-clear-mask {
  font-family: var(--font-lovelo);
  background: var(--slate-50);
  color: var(--slate-400);
  border: 1px solid var(--slate-200);
  padding: 0.75rem 1rem;
  border-radius: 0.75rem;
  cursor: pointer;
  text-transform: uppercase;
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  transition: border-color 0.2s, color 0.2s;
}
.btn-clear-mask:hover { border-color: var(--rose-400); color: var(--rose-400); }
.btn-clear-mask:disabled { opacity: 0.3; cursor: not-allowed; }

.btn-erase {
  font-family: var(--font-lovelo);
  background: var(--slate-50);
  color: var(--slate-500);
  border: 1px solid var(--slate-200);
  padding: 0.5rem 0.75rem;
  border-radius: 0.5rem;
  cursor: pointer;
  text-transform: uppercase;
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  transition: border-color 0.2s, background 0.2s, color 0.2s;
}
.btn-erase:hover { border-color: var(--amber-400); }

/* ─── Design controls ───────────────────────────────────────────── */
.field-group { display: flex; flex-direction: column; gap: 0.25rem; }

.field-label {
  font-family: var(--font-lovelo);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  font-size: 0.68rem;
  font-weight: 700;
  color: var(--slate-500);
  display: block;
}
.field-input {
  width: 100%;
  padding: 0.65rem 0.85rem;
  background: var(--slate-50);
  border: 1px solid var(--slate-200);
  border-radius: 10px;
  font-family: var(--font-lato);
  font-size: 0.875rem;
  color: var(--slate-700);
  outline: none;
  transition: border-color 0.15s;
}
.field-input:focus {
  border-color: rgba(214,70,47,0.4);
  box-shadow: 0 0 0 3px var(--brand-glow);
}

.change-type-section { display: flex; flex-direction: column; gap: 0.5rem; }
.change-type-row     { display: flex; gap: 0.5rem; }
.option-btns-row     { display: flex; gap: 0.5rem; }

.change-type-btn {
  flex: 1;
  font-family: var(--font-lovelo);
  padding: 0.625rem;
  border-radius: 0.75rem;
  border: 1px solid var(--slate-200);
  background: var(--slate-50);
  color: var(--slate-400);
  cursor: pointer;
  text-transform: uppercase;
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  transition: border-color 0.2s, color 0.2s, background 0.2s;
}
.change-type-btn:hover { border-color: rgba(214,70,47,0.4); color: var(--slate-500); }
.change-type-btn.active { background: var(--brand); color: white; border-color: var(--brand); }

/* ─── Toggle rows ───────────────────────────────────────────────── */
.toggle-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  background: var(--slate-50);
  padding: 0.65rem 0.85rem;
  border-radius: 10px;
  cursor: pointer;
  border: 1px solid var(--slate-200);
  transition: border-color 0.15s;
}
.toggle-row:hover { border-color: rgba(214,70,47,0.3); }
.toggle-check {
  width: 1.1rem;
  height: 1.1rem;
  border-radius: 4px;
  border-color: var(--slate-300);
  accent-color: var(--brand);
  flex-shrink: 0;
}
.toggle-label {
  font-family: var(--font-lato);
  text-transform: uppercase;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--slate-500);
}

/* ─── Sliders ───────────────────────────────────────────────────── */
.slider-row { display: flex; align-items: center; gap: 0.75rem; }
.slider-label {
  font-family: var(--font-lovelo);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 0.65rem;
  color: var(--slate-400);
  width: 6rem;
  flex-shrink: 0;
}
.slider-input { flex: 1; accent-color: var(--brand); height: 4px; cursor: pointer; }
.temp-slider {
  -webkit-appearance: none; appearance: none;
  height: 4px; border-radius: 2px;
  background: var(--slate-200); outline: none;
}
.temp-slider::-webkit-slider-thumb {
  -webkit-appearance: none; appearance: none;
  width: 14px; height: 14px; border-radius: 50%;
  background: var(--brand); cursor: pointer;
}
.temp-slider::-moz-range-thumb {
  width: 14px; height: 14px; border-radius: 50%;
  background: var(--brand); cursor: pointer; border: none;
}
.slider-val {
  font-family: var(--font-lato);
  font-size: 0.7rem; color: var(--slate-400);
  width: 2.5rem; text-align: right; flex-shrink: 0;
}

/* ─── Object removal ────────────────────────────────────────────── */
.tool-row { display: flex; gap: 0.5rem; }
.brush-controls { display: flex; align-items: center; gap: 0.75rem; }
.brush-label {
  font-family: var(--font-lovelo);
  color: var(--slate-500);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  flex-shrink: 0;
}
.brush-size-input { flex: 1; accent-color: var(--brand); }
.brush-size-val {
  font-family: var(--font-lato);
  color: var(--slate-400);
  font-size: 0.72rem;
  width: 2.5rem;
  text-align: right;
}

/* ─── Error message ─────────────────────────────────────────────── */
.error-msg {
  color: var(--rose-500);
  font-size: 0.875rem;
  font-family: var(--font-lato);
  text-align: center;
}

/* ─── History ───────────────────────────────────────────────────── */
.history-list { display: flex; flex-direction: column; gap: 0.75rem; }
.history-empty {
  font-family: var(--font-lato);
  color: var(--slate-300);
  font-style: italic;
  text-align: center;
  padding: 1rem 0;
  font-size: 0.875rem;
}
.history-item {
  display: flex;
  align-items: center;
  gap: 1rem;
  background: white;
  padding: 0.25rem;
  border-radius: 0.5rem;
  border: 1px solid var(--slate-100);
  box-shadow: 0 1px 2px rgba(0,0,0,0.05);
  cursor: pointer;
  position: relative;
  transition: box-shadow 0.2s;
}
.history-item:hover { box-shadow: 0 4px 12px rgba(0,0,0,0.1); }
.history-thumb {
  width: 4rem; height: 4rem;
  flex-shrink: 0;
  background: var(--slate-100);
  border-radius: 0.25rem;
  overflow: hidden;
}
.history-thumb img { width: 100%; height: 100%; object-fit: cover; }
.history-label {
  flex: 1;
  font-family: var(--font-lato);
  color: var(--slate-400);
  font-size: 0.72rem;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  padding-right: 2rem;
}
.history-item:hover .history-label { color: var(--slate-600); }
.history-delete {
  position: absolute;
  right: 0.5rem;
  padding: 0.5rem;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--slate-500);
  transition: color 0.2s;
}
.history-delete:hover { color: var(--rose-500); }
.history-delete svg { width: 1rem; height: 1rem; display: block; }

/* ─── Warning modal ─────────────────────────────────────────────── */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,0.4);
}
.modal-box {
  background: white;
  border-radius: 1rem;
  box-shadow: 0 20px 60px rgba(0,0,0,0.25);
  padding: 1.5rem;
  max-width: 20rem;
  width: calc(100% - 2rem);
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.modal-msg {
  font-family: var(--font-lato);
  color: var(--slate-700);
  font-size: 0.875rem;
  text-align: center;
}
.btn-modal-ok {
  font-family: var(--font-lovelo);
  background: var(--brand);
  color: white;
  border: none;
  padding: 0.625rem;
  border-radius: 0.75rem;
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  cursor: pointer;
  transition: background 0.2s;
}
.btn-modal-ok:hover { background: var(--brand-hover); }

/* ─── Footer ────────────────────────────────────────────────────── */
.site-footer { background: white; padding: 1.5rem; text-align: center; }
.footer-copyright {
  font-family: var(--font-lato);
  color: var(--slate-400);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
}

/* ─── How It Works page ─────────────────────────────────────────── */
.hiw-intro { background: white; border-bottom: 1px solid var(--slate-100); }
.hiw-intro-inner {
  max-width: 48rem;
  margin: 0 auto;
  padding: 5rem 1.5rem;
  text-align: center;
}
.hiw-eyebrow {
  font-family: var(--font-lovelo);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--brand);
  margin-bottom: 1.25rem;
  display: block;
}
.hiw-title {
  font-family: var(--font-playfair);
  font-size: 2.5rem;
  color: var(--slate-800);
  margin: 0 0 1.5rem;
}
.hiw-lead {
  font-family: var(--font-lato);
  color: var(--slate-500);
  font-size: 1rem;
  line-height: 1.7;
  margin: 0;
}
.hiw-main {
  flex: 1;
  max-width: 56rem;
  margin: 0 auto;
  width: 100%;
  padding: 3.5rem 2rem;
}
.hiw-section { margin-bottom: 4rem; }
.hiw-section-title {
  font-family: var(--font-lovelo);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--brand);
  margin-bottom: 1.5rem;
  display: block;
}
.hiw-grid-4 { display: grid; grid-template-columns: repeat(4,1fr); gap: 1rem; }
.hiw-grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.hiw-grid-fields { display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem 2.5rem; }
.hiw-grid-enhancements { display: grid; grid-template-columns: 1fr 1fr; gap: 1.25rem 2.5rem; }

.step-num {
  width: 1.5rem; height: 1.5rem;
  border-radius: 4px;
  background: var(--brand);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-family: var(--font-lovelo);
  color: white;
  font-size: 0.65rem;
  margin-bottom: 0.5rem;
}
.hiw-card-title {
  font-family: var(--font-lovelo);
  text-transform: uppercase;
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--slate-700);
  margin: 0 0 0.25rem;
}
.hiw-card-body {
  font-family: var(--font-lato);
  color: var(--slate-500);
  font-size: 0.875rem;
  line-height: 1.6;
  margin: 0;
}
.hiw-card-tip {
  font-family: var(--font-lato);
  color: var(--slate-400);
  font-size: 0.75rem;
  font-style: italic;
  margin: 0;
}
.hiw-type-card { border-left: 4px solid var(--brand); }
.hiw-field-title {
  font-family: var(--font-lovelo);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  font-size: 0.68rem;
  font-weight: 700;
  color: var(--slate-500);
  display: block;
  margin-bottom: 0.35rem;
}
.hiw-field-body {
  font-family: var(--font-lato);
  color: var(--slate-500);
  font-size: 0.875rem;
  line-height: 1.6;
  margin: 0;
}
.hiw-col-span-2 { grid-column: 1 / -1; }
.hiw-ol {
  list-style: none;
  padding: 0; margin: 0;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.hiw-ol-item { display: flex; gap: 1rem; }
.hiw-ol-num {
  font-family: var(--font-lovelo);
  color: var(--brand);
  font-size: 0.875rem;
  flex-shrink: 0;
  width: 1.5rem;
}
.hiw-ol-title {
  font-family: var(--font-lato);
  color: var(--slate-600);
  font-size: 0.875rem;
  font-weight: 700;
  margin: 0 0 0.25rem;
}
.hiw-ol-body {
  font-family: var(--font-lato);
  color: var(--slate-500);
  font-size: 0.875rem;
  line-height: 1.6;
  margin: 0;
}
.hiw-note {
  font-family: var(--font-lato);
  color: var(--slate-400);
  font-size: 0.75rem;
  font-style: italic;
  margin: 0.5rem 0 0;
}
.hiw-tip-card { display: flex; gap: 1rem; }
.hiw-tip-star { color: var(--brand); font-size: 1.25rem; flex-shrink: 0; line-height: 1.4; }
.hiw-tip-title {
  font-family: var(--font-lato);
  color: var(--slate-600);
  font-size: 0.875rem;
  font-weight: 700;
  margin: 0 0 0.25rem;
}
.hiw-tip-body {
  font-family: var(--font-lato);
  color: var(--slate-500);
  font-size: 0.875rem;
  line-height: 1.6;
  margin: 0;
}
.hiw-cta { text-align: center; padding: 1.5rem 0; }
.btn-hiw-cta {
  font-family: var(--font-lovelo);
  display: inline-block;
  background: var(--brand);
  color: white;
  padding: 1rem 5rem;
  border-radius: 0.75rem;
  box-shadow: 0 1px 2px rgba(0,0,0,0.1);
  text-decoration: none;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-size: 0.875rem;
  transition: background 0.2s;
}
.btn-hiw-cta:hover { background: var(--brand-hover); }

/* ─── Scrollbar ──────────────────────────────────────────────────── */
.custom-scrollbar::-webkit-scrollbar       { width: 4px; }
.custom-scrollbar::-webkit-scrollbar-track { background: transparent; }
.custom-scrollbar::-webkit-scrollbar-thumb { background: var(--slate-300); border-radius: 2px; }

/* ─── Responsive ─────────────────────────────────────────────────── */
@media (max-width: 900px) {
  .app-grid     { grid-template-columns: 1fr; }
  .hiw-grid-4   { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 600px) {
  .app-main     { padding: 1.5rem 1rem 3rem; }
  .hiw-grid-4,
  .hiw-grid-2,
  .hiw-grid-fields,
  .hiw-grid-enhancements { grid-template-columns: 1fr; }
  .hiw-main     { padding: 2rem 1rem; }
  .hiw-col-span-2 { grid-column: 1; }
}