/* ── 1. Tokens ─────────────────────────────────────────── */

:root {
  --bg-base:        #0d0d12;
  --bg-surface:     #14141c;
  --bg-glass:       rgba(255, 255, 255, 0.05);
  --bg-overlay:     rgba(9, 9, 14, 0.9);

  --accent-a:       #8b5cf6;
  --accent-b:       #06b6d4;
  --accent-glow:    rgba(139, 92, 246, 0.32);
  --accent-grad:    linear-gradient(135deg, #8b5cf6, #06b6d4);

  --text-primary:   #f0f0ff;
  --text-secondary: #8888aa;
  --text-muted:     #55556a;

  --divider:        rgba(255, 255, 255, 0.07);
  --chip-bg:        rgba(255, 255, 255, 0.07);
  --toggle-off:     #2a2a3c;

  --r-sm:   8px;
  --r-md:   16px;
  --r-lg:   24px;
  --r-full: 999px;

  --sp-1: 4px;
  --sp-2: 8px;
  --sp-3: 12px;
  --sp-4: 16px;
  --sp-5: 20px;
  --sp-6: 24px;

  --shadow-md:   0 8px 32px rgba(0, 0, 0, 0.55);
  --shadow-glow: 0 0 48px var(--accent-glow);

  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --ease-out:    cubic-bezier(0.0, 0.0, 0.2, 1);
}

/* ── 2. Reset ──────────────────────────────────────────── */

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

html, body {
  height: 100%;
  overflow: hidden;
}

body {
  font-family: "Space Grotesk", sans-serif;
  color: var(--text-primary);
  background: var(--bg-base);
  -webkit-font-smoothing: antialiased;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

input, select {
  font-family: inherit;
}

/* ── 3. App shell ──────────────────────────────────────── */

#appShell {
  display: flex;
  flex-direction: column;
  height: 100dvh;
  overflow: hidden;
  position: relative;
}

/* ── 4. Top bar ────────────────────────────────────────── */

#topBar {
  flex-shrink: 0;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--sp-3);
  border-bottom: 1px solid var(--divider);
  position: relative;
  z-index: 10;
}

.app-title {
  font-family: "Fraunces", serif;
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: -0.01em;
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
}

.icon-btn {
  width: 40px;
  height: 40px;
  border-radius: var(--r-full);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-weight: 600;
  border: 1px solid var(--divider);
  transition: background 0.15s ease, color 0.15s ease;
  flex-shrink: 0;
}

.icon-btn:hover {
  background: var(--bg-glass);
  color: var(--text-primary);
}

/* Back button: hidden in idle state */
body[data-state="idle"] #backBtn { visibility: hidden; }
body[data-state="converting"] #backBtn { visibility: hidden; }

/* Reset crop: hidden unless file is selected */
#resetCropBtn { visibility: hidden; }

/* ── 5. Step sections ──────────────────────────────────── */

.step {
  display: none;
  flex: 1;
  min-height: 0;
  position: relative;
  overflow: hidden;
}

body[data-state="idle"] #step1,
body[data-state="file-selected"] #step1 {
  display: flex;
  flex-direction: column;
}

body[data-state="settings"] #step2,
body[data-state="converting"] #step2 {
  display: flex;
  flex-direction: column;
}

body[data-state="result"] #step3 {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--sp-4);
  animation: stepFadeIn 0.4s var(--ease-out) both;
}

@keyframes stepFadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

/* ── 6. Step 1: Upload zone ────────────────────────────── */

#uploadZone {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: var(--sp-5);
  border-radius: var(--r-lg);
  border: 2px dashed rgba(139, 92, 246, 0.3);
  background: rgba(139, 92, 246, 0.04);
  transition: border-color 0.2s ease, background 0.2s ease;
  cursor: pointer;
}

#uploadZone:hover,
#uploadZone.drag-over {
  border-color: var(--accent-a);
  background: rgba(139, 92, 246, 0.08);
}

.upload-label {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--sp-3);
  cursor: pointer;
  user-select: none;
  padding: var(--sp-6);
  text-align: center;
}

.upload-icon {
  font-size: 3rem;
  line-height: 1;
  filter: grayscale(0.2);
}

.upload-heading {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.upload-sub {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

#fileInput {
  display: none;
}

/* ── 7. Crop wrapper ───────────────────────────────────── */

#cropWrapper {
  flex: 1;
  min-height: 0;
  overflow: hidden;
}

#cropImage {
  display: block;
  max-width: 100%;
}

/* Cropper.js overrides for dark theme */
.cropper-bg {
  background-image: none;
  background-color: var(--bg-base);
}

.cropper-point {
  width: 12px !important;
  height: 12px !important;
  background-color: var(--accent-a) !important;
  opacity: 1 !important;
}

.cropper-line {
  background-color: rgba(139, 92, 246, 0.5);
}

.cropper-view-box {
  outline: 2px solid var(--accent-a);
  outline-color: var(--accent-a);
}

.cropper-face {
  background-color: transparent;
}

.cropper-modal {
  background-color: rgba(0, 0, 0, 0.6);
  opacity: 1;
}

/* ── 8. Step 2: Bottom sheet ───────────────────────────── */

/* Blurred crop preview behind the sheet */
#cropThumb {
  flex: 1;
  background-size: cover;
  background-position: center;
  filter: blur(20px) brightness(0.4);
  transform: scale(1.1);
}

.bottom-sheet {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--bg-surface);
  border-radius: var(--r-lg) var(--r-lg) 0 0;
  border-top: 1px solid var(--divider);
  box-shadow: var(--shadow-md);
  display: flex;
  flex-direction: column;
  max-height: 75%;
}

/* Animate in when the settings step first becomes visible.
   CSS animation (unlike transition) fires on first render — this is intentional. */
body[data-state="settings"] .bottom-sheet {
  animation: sheetSlideUp 0.4s var(--ease-spring) both;
}

/* Remain at rest during conversion (no re-animation) */
body[data-state="converting"] .bottom-sheet {
  transform: translateY(0);
}

@keyframes sheetSlideUp {
  from { transform: translateY(100%); }
  to   { transform: translateY(0); }
}

.sheet-handle {
  flex-shrink: 0;
  width: 36px;
  height: 4px;
  border-radius: var(--r-full);
  background: rgba(255, 255, 255, 0.15);
  margin: 10px auto 6px;
  cursor: grab;
}

.sheet-body {
  overflow-y: auto;
  padding: var(--sp-3) var(--sp-5) var(--sp-6);
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

.sheet-body::-webkit-scrollbar {
  display: none;
}

/* ── 9. Sheet label ────────────────────────────────────── */

.sheet-label {
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-muted);
  margin-bottom: var(--sp-2);
}

/* ── 10. Chip row ──────────────────────────────────────── */

.chip-row {
  display: flex;
  gap: var(--sp-2);
  overflow-x: auto;
  padding: var(--sp-1) 0 var(--sp-2);
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

.chip-row::-webkit-scrollbar {
  display: none;
}

.chip {
  flex-shrink: 0;
  padding: 9px 18px;
  border-radius: var(--r-full);
  border: 1px solid rgba(255, 255, 255, 0.1);
  background: var(--chip-bg);
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-weight: 600;
  transition: all 0.15s ease;
  min-height: 40px;
}

.chip:hover {
  background: rgba(255, 255, 255, 0.1);
  color: var(--text-primary);
}

.chip.selected {
  background: var(--accent-grad);
  border-color: transparent;
  color: #fff;
  box-shadow: 0 0 20px var(--accent-glow);
}

/* ── 11. Sheet divider ─────────────────────────────────── */

.sheet-divider {
  height: 1px;
  background: var(--divider);
  margin: var(--sp-3) 0;
}

/* ── 12. Toggle rows ───────────────────────────────────── */

.toggle-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 13px 0;
  cursor: pointer;
}

.toggle-label {
  font-size: 0.9rem;
  color: var(--text-primary);
  user-select: none;
}

.toggle-wrap {
  position: relative;
  flex-shrink: 0;
}

.toggle-input {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.toggle-track {
  display: block;
  width: 48px;
  height: 26px;
  border-radius: var(--r-full);
  background: var(--toggle-off);
  position: relative;
  transition: background 0.18s ease;
}

.toggle-thumb {
  display: block;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: #fff;
  position: absolute;
  top: 3px;
  left: 3px;
  transition: transform 0.18s var(--ease-spring);
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.4);
}

.toggle-input:checked + .toggle-track {
  background: var(--accent-a);
}

.toggle-input:checked + .toggle-track .toggle-thumb {
  transform: translateX(22px);
}

/* ── 13. Advanced settings disclosure ─────────────────── */

#advancedDetails {
  margin-top: var(--sp-1);
}

.advanced-summary {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent-a);
  cursor: pointer;
  list-style: none;
  padding: var(--sp-2) 0;
  user-select: none;
}

.advanced-summary::-webkit-details-marker {
  display: none;
}

.advanced-summary::before {
  content: '▸';
  font-size: 0.7rem;
  transition: transform 0.18s ease;
  display: inline-block;
}

#advancedDetails[open] .advanced-summary::before {
  transform: rotate(90deg);
}

.advanced-body {
  padding-top: var(--sp-3);
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
}

/* W × H row */
.wh-row {
  display: flex;
  align-items: flex-end;
  gap: var(--sp-2);
}

.wh-field {
  display: flex;
  flex-direction: column;
  gap: 6px;
  flex: 1;
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 600;
}

.wh-field input {
  padding: 10px 12px;
  border-radius: var(--r-sm);
  border: 1px solid var(--divider);
  background: var(--bg-glass);
  color: var(--text-primary);
  font-size: 0.9rem;
  width: 100%;
}

.times-sign {
  color: var(--text-muted);
  font-size: 1.1rem;
  padding-bottom: 10px;
  flex-shrink: 0;
}

/* Advanced field (select, color) */
.adv-field {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 600;
}

.adv-field select,
.adv-field input[type="color"] {
  padding: 10px 12px;
  border-radius: var(--r-sm);
  border: 1px solid var(--divider);
  background: var(--bg-glass);
  color: var(--text-primary);
  font-size: 0.875rem;
  appearance: auto;
}

.adv-field input[type="color"] {
  padding: 4px 8px;
  height: 40px;
  cursor: pointer;
}

/* Weights */
.weights-label {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-top: var(--sp-2);
  margin-bottom: var(--sp-1);
}

.weights-row {
  display: flex;
  gap: var(--sp-2);
}

.weight-field {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 600;
}

.weight-field input {
  padding: 9px 8px;
  border-radius: var(--r-sm);
  border: 1px solid var(--divider);
  background: var(--bg-glass);
  color: var(--text-primary);
  font-size: 0.875rem;
  width: 100%;
  text-align: center;
}

/* ── 14. Step 3: Canvas preview ────────────────────────── */

#previewPlaceholder {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
  color: var(--text-muted);
  font-size: 0.9rem;
}

#previewCanvas {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  border-radius: var(--r-md);
  animation: revealCanvas 0.42s var(--ease-spring) both;
}

@keyframes revealCanvas {
  from { opacity: 0; transform: scale(0.93); }
  to   { opacity: 1; transform: scale(1); }
}

#warnings {
  position: absolute;
  bottom: var(--sp-3);
  left: var(--sp-4);
  right: var(--sp-4);
  color: #f87171;
  font-size: 0.78rem;
  text-align: center;
}

/* ── 15. Converting overlay ────────────────────────────── */

.converting-overlay {
  position: fixed;
  inset: 0;
  z-index: 100;
  background: var(--bg-overlay);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.28s var(--ease-out);
}

body[data-state="converting"] .converting-overlay {
  opacity: 1;
  pointer-events: auto;
}

.overlay-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--sp-3);
  background: var(--bg-glass);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--r-lg);
  padding: 40px 52px;
  box-shadow: var(--shadow-glow);
  backdrop-filter: blur(10px);
  text-align: center;
}

/* SVG progress ring */
.progress-ring {
  width: 80px;
  height: 80px;
}

.ring-track {
  fill: none;
  stroke: rgba(255, 255, 255, 0.08);
  stroke-width: 6;
}

.ring-fill {
  fill: none;
  stroke: url(#ringGradient);
  stroke-width: 6;
  stroke-linecap: round;
  transform-origin: 40px 40px;
  transform: rotate(-90deg);
  stroke-dasharray: 213.6;  /* 2π × 34 */
  stroke-dashoffset: 213.6; /* starts empty */
  transition: stroke-dashoffset 0.1s linear;
}

.progress-pct {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-top: -var(--sp-1);
}

.status-text {
  font-size: 0.85rem;
  color: var(--text-secondary);
  max-width: 18ch;
}

/* ── 16. Progress dots ─────────────────────────────────── */

.progress-dots {
  flex-shrink: 0;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
}

.dot {
  width: 6px;
  height: 6px;
  border-radius: var(--r-full);
  background: rgba(255, 255, 255, 0.2);
  transition: width 0.25s var(--ease-spring), background 0.25s ease;
}

/* Active dot: pill shape */
body[data-state="idle"] .dot[data-step="1"],
body[data-state="file-selected"] .dot[data-step="1"] {
  width: 20px;
  background: var(--accent-a);
}

body[data-state="settings"] .dot[data-step="2"],
body[data-state="converting"] .dot[data-step="2"] {
  width: 20px;
  background: var(--accent-a);
}

body[data-state="result"] .dot[data-step="3"] {
  width: 20px;
  background: var(--accent-a);
}

/* ── 17. Bottom bar ────────────────────────────────────── */

#bottomBar {
  flex-shrink: 0;
  padding: var(--sp-3) var(--sp-4);
  padding-bottom: max(var(--sp-3), env(safe-area-inset-bottom, 0px));
  background: var(--bg-surface);
  border-top: 1px solid var(--divider);
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
}

/* CTA wrap */
#ctaWrap {
  display: flex;
}

body[data-state="result"] #ctaWrap {
  display: none;
}

.cta-btn {
  width: 100%;
  padding: 17px var(--sp-6);
  border-radius: var(--r-full);
  background: var(--accent-grad);
  color: #fff;
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  box-shadow: 0 0 36px var(--accent-glow);
  transition: transform 0.12s ease, box-shadow 0.2s ease, opacity 0.15s ease;
}

.cta-btn:hover:not(:disabled) {
  transform: scale(1.01);
  box-shadow: 0 0 52px var(--accent-glow);
}

.cta-btn:active:not(:disabled) {
  transform: scale(0.97);
}

.cta-btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
  box-shadow: none;
}

/* ── 18. Grid info badge ───────────────────────────────── */

#gridInfoBadge {
  display: none;
  justify-content: center;
  font-size: 0.75rem;
  color: var(--text-muted);
  letter-spacing: 0.04em;
}

body[data-state="result"] #gridInfoBadge {
  display: flex;
}

/* ── 19. Export strip ──────────────────────────────────── */

#exportStrip {
  display: none;
  gap: var(--sp-2);
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

#exportStrip::-webkit-scrollbar {
  display: none;
}

body[data-state="result"] #exportStrip {
  display: flex;
}

.export-btn {
  flex-shrink: 0;
  padding: 12px 18px;
  border-radius: var(--r-full);
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: var(--chip-bg);
  color: var(--text-primary);
  font-size: 0.85rem;
  font-weight: 600;
  transition: background 0.15s ease, transform 0.1s ease;
  min-height: 44px;
}

.export-btn:hover:not(:disabled) {
  background: rgba(255, 255, 255, 0.12);
}

.export-btn:active:not(:disabled) {
  transform: scale(0.95);
}

.export-btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.share-btn {
  background: var(--accent-grad);
  border-color: transparent;
  box-shadow: 0 0 16px var(--accent-glow);
  font-weight: 700;
}

.share-btn:hover:not(:disabled) {
  background: var(--accent-grad);
  box-shadow: 0 0 28px var(--accent-glow);
}

/* ── 20. Credit footer ─────────────────────────────────── */

.credit {
  position: fixed;
  bottom: 0;
  right: var(--sp-4);
  font-size: 0.68rem;
  color: var(--text-muted);
  opacity: 0.4;
  letter-spacing: 0.04em;
  pointer-events: none;
  z-index: 1;
  /* visible only in non-result states so it doesn't overlap exports */
  padding-bottom: max(2px, env(safe-area-inset-bottom, 0px));
}

body[data-state="result"] .credit {
  display: none;
}

/* ── 21. Desktop (≥ 768px) ─────────────────────────────── */

@media (min-width: 768px) {
  /* Step 2: bottom sheet becomes right side panel */
  .bottom-sheet {
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: auto;
    width: 340px;
    border-radius: var(--r-lg) 0 0 var(--r-lg);
    border-top: none;
    border-left: 1px solid var(--divider);
    max-height: none;
  }

  body[data-state="settings"] .bottom-sheet {
    animation: sheetSlideIn 0.4s var(--ease-spring) both;
  }

  body[data-state="converting"] .bottom-sheet {
    transform: translateX(0);
  }

  @keyframes sheetSlideIn {
    from { transform: translateX(100%); }
    to   { transform: translateX(0); }
  }

  .sheet-handle {
    display: none;
  }

  /* Step 3: canvas with more breathing room */
  body[data-state="result"] #step3 {
    padding: var(--sp-6);
  }

  /* Bottom bar: constrain CTA width */
  #ctaWrap {
    max-width: 400px;
    margin: 0 auto;
    width: 100%;
  }

  /* Export strip: centered, no scroll needed */
  #exportStrip {
    justify-content: center;
    flex-wrap: wrap;
    overflow-x: visible;
  }
}

/* ── 22. Advanced inputs (dark styling) ─────────────────── */

input[type="number"]::-webkit-inner-spin-button,
input[type="number"]::-webkit-outer-spin-button {
  opacity: 0.4;
}

input:focus, select:focus {
  outline: 2px solid var(--accent-a);
  outline-offset: 2px;
}