* {
  box-sizing: border-box;
}

/* Theme Variables */
:root {
  --bg-primary: #fff0f3;
  --bg-secondary: #fff5f7;
  --bg-card: #ffffff;
  --bg-body: linear-gradient(180deg, #fff0f3 0%, #ffe4ec 40%, #fdf2f8 100%);
  --text-primary: #4a2030;
  --text-secondary: #7a4060;
  --text-muted: #b07090;
  --border-color: #fbb6ce;
  --border-light: #fce7f3;
  --header-gradient: linear-gradient(135deg, #f472b6 0%, #ec4899 40%, #db2777 100%);
  --pill-active-bg: linear-gradient(135deg, #fce7f3, #fbb6ce);
  --pill-active-border: #ec4899;
  --pill-active-shadow: rgba(236, 72, 153, 0.15);
  --pill-hover-shadow: rgba(236, 72, 153, 0.25);
  --skill-active-bg: linear-gradient(135deg, #ec4899, #f472b6);
  --generate-bg: linear-gradient(135deg, #ec4899 0%, #f472b6 100%);
  --generate-hover-shadow: rgba(236, 72, 153, 0.4);
  --progress-fill: linear-gradient(90deg, #4ade80, #86efac, #f472b6);
  --surprise-border: #fbbf24;
  --surprise-text: #d97706;
  --surprise-hover-bg: #fffbeb;
  --checkbox-border: #f9a8d4;
  --checkbox-checked-bg: linear-gradient(135deg, #4ade80, #86efac);
  --error-bg: #fff1f2;
  --error-border: #fecdd3;
  --error-text: #e11d48;
  --history-hover-bg: #fce7f3;
  --material-bg: linear-gradient(135deg, #fce7f3, #fbb6ce);
  --material-border: #f9a8d4;
  --material-text: #9d174d;
  --coral-accent: #ec4899;
  --step-time-bg: #fce7f3;
  --step-time-text: #db2777;
  --copy-text: #d8b4fe;
  --copy-hover: #c084fc;
  --input-focus-shadow: rgba(236, 72, 153, 0.15);
  --input-focus-border: #f9a8d4;
  --input-bg: #ffffff;
  --input-text: #4a2030;
  --footer-border: #fce7f3;
  --footer-text: #b07090;
}

.theme-pink {
  /* Default, uses :root vars */
}

.theme-dark {
  --bg-primary: #1a1025;
  --bg-secondary: #241535;
  --bg-card: #2a1a3e;
  --bg-body: linear-gradient(180deg, #1a1025 0%, #1e1230 40%, #241535 100%);
  --text-primary: #f0e6f6;
  --text-secondary: #d0b8e0;
  --text-muted: #9070a8;
  --border-color: #4a2d6a;
  --border-light: #3a2050;
  --header-gradient: linear-gradient(135deg, #7c3aed 0%, #6d28d9 40%, #5b21b6 100%);
  --pill-active-bg: linear-gradient(135deg, #3a2050, #4a2d6a);
  --pill-active-border: #8b5cf6;
  --pill-active-shadow: rgba(139, 92, 246, 0.3);
  --pill-hover-shadow: rgba(139, 92, 246, 0.3);
  --skill-active-bg: linear-gradient(135deg, #7c3aed, #8b5cf6);
  --generate-bg: linear-gradient(135deg, #7c3aed 0%, #a855f7 100%);
  --generate-hover-shadow: rgba(139, 92, 246, 0.5);
  --progress-fill: linear-gradient(90deg, #4ade80, #86efac, #a855f7);
  --surprise-border: #fbbf24;
  --surprise-text: #fbbf24;
  --surprise-hover-bg: rgba(251, 191, 36, 0.1);
  --checkbox-border: #8b5cf6;
  --checkbox-checked-bg: linear-gradient(135deg, #4ade80, #86efac);
  --error-bg: #3b1028;
  --error-border: #6b1040;
  --error-text: #f9a8d4;
  --history-hover-bg: #3a2050;
  --material-bg: linear-gradient(135deg, #3a2050, #4a2d6a);
  --material-border: #6d28d9;
  --material-text: #d8b4fe;
  --coral-accent: #a855f7;
  --step-time-bg: #3a2050;
  --step-time-text: #c084fc;
  --copy-text: #a78bfa;
  --copy-hover: #c4b5fd;
  --input-focus-shadow: rgba(139, 92, 246, 0.25);
  --input-focus-border: #7c3aed;
  --input-bg: #2a1a3e;
  --input-text: #f0e6f6;
  --footer-border: #3a2050;
  --footer-text: #9070a8;
}

.theme-ocean {
  --bg-primary: #f0f7ff;
  --bg-secondary: #e8f4fd;
  --bg-card: #ffffff;
  --bg-body: linear-gradient(180deg, #f0f7ff 0%, #dbeafe 40%, #eff6ff 100%);
  --text-primary: #1e3a5f;
  --text-secondary: #3b6b9a;
  --text-muted: #7ba3c9;
  --border-color: #93c5fd;
  --border-light: #dbeafe;
  --header-gradient: linear-gradient(135deg, #3b82f6 0%, #2563eb 40%, #1d4ed8 100%);
  --pill-active-bg: linear-gradient(135deg, #dbeafe, #bfdbfe);
  --pill-active-border: #3b82f6;
  --pill-active-shadow: rgba(59, 130, 246, 0.15);
  --pill-hover-shadow: rgba(59, 130, 246, 0.25);
  --skill-active-bg: linear-gradient(135deg, #3b82f6, #60a5fa);
  --generate-bg: linear-gradient(135deg, #2563eb 0%, #3b82f6 100%);
  --generate-hover-shadow: rgba(59, 130, 246, 0.4);
  --progress-fill: linear-gradient(90deg, #4ade80, #86efac, #60a5fa);
  --surprise-border: #fbbf24;
  --surprise-text: #d97706;
  --surprise-hover-bg: #fffbeb;
  --checkbox-border: #93c5fd;
  --checkbox-checked-bg: linear-gradient(135deg, #4ade80, #86efac);
  --error-bg: #fef2f2;
  --error-border: #fecaca;
  --error-text: #dc2626;
  --history-hover-bg: #dbeafe;
  --material-bg: linear-gradient(135deg, #dbeafe, #bfdbfe);
  --material-border: #93c5fd;
  --material-text: #1d4ed8;
  --coral-accent: #3b82f6;
  --step-time-bg: #dbeafe;
  --step-time-text: #2563eb;
  --copy-text: #93c5fd;
  --copy-hover: #60a5fa;
  --input-focus-shadow: rgba(59, 130, 246, 0.15);
  --input-focus-border: #93c5fd;
  --input-bg: #ffffff;
  --input-text: #1e3a5f;
  --footer-border: #dbeafe;
  --footer-text: #7ba3c9;
}

.theme-forest {
  --bg-primary: #f0fdf4;
  --bg-secondary: #ecfdf5;
  --bg-card: #ffffff;
  --bg-body: linear-gradient(180deg, #f0fdf4 0%, #dcfce7 40%, #ecfdf5 100%);
  --text-primary: #14532d;
  --text-secondary: #166534;
  --text-muted: #4ade80;
  --border-color: #86efac;
  --border-light: #dcfce7;
  --header-gradient: linear-gradient(135deg, #22c55e 0%, #16a34a 40%, #15803d 100%);
  --pill-active-bg: linear-gradient(135deg, #dcfce7, #bbf7d0);
  --pill-active-border: #22c55e;
  --pill-active-shadow: rgba(34, 197, 94, 0.15);
  --pill-hover-shadow: rgba(34, 197, 94, 0.25);
  --skill-active-bg: linear-gradient(135deg, #22c55e, #4ade80);
  --generate-bg: linear-gradient(135deg, #16a34a 0%, #22c55e 100%);
  --generate-hover-shadow: rgba(34, 197, 94, 0.4);
  --progress-fill: linear-gradient(90deg, #fbbf24, #fde68a, #4ade80);
  --surprise-border: #fbbf24;
  --surprise-text: #d97706;
  --surprise-hover-bg: #fffbeb;
  --checkbox-border: #86efac;
  --checkbox-checked-bg: linear-gradient(135deg, #4ade80, #86efac);
  --error-bg: #fef2f2;
  --error-border: #fecaca;
  --error-text: #dc2626;
  --history-hover-bg: #dcfce7;
  --material-bg: linear-gradient(135deg, #dcfce7, #bbf7d0);
  --material-border: #86efac;
  --material-text: #15803d;
  --coral-accent: #22c55e;
  --step-time-bg: #dcfce7;
  --step-time-text: #16a34a;
  --copy-text: #86efac;
  --copy-hover: #4ade80;
  --input-focus-shadow: rgba(34, 197, 94, 0.15);
  --input-focus-border: #86efac;
  --input-bg: #ffffff;
  --input-text: #14532d;
  --footer-border: #dcfce7;
  --footer-text: #4ade80;
}

.theme-sunset {
  --bg-primary: #fffdf5;
  --bg-secondary: #fff5f2;
  --bg-card: #ffffff;
  --bg-body: linear-gradient(180deg, #fffdf5 0%, #fff5f2 40%, #faf5ff 100%);
  --text-primary: #451a03;
  --text-secondary: #78350f;
  --text-muted: #b45309;
  --border-color: #fcd34d;
  --border-light: #fef3c7;
  --header-gradient: linear-gradient(135deg, #ff6b42 0%, #ffc107 50%, #ff8a6b 100%);
  --pill-active-bg: linear-gradient(135deg, #fff5f2, #ffe8e0);
  --pill-active-border: #ff6b42;
  --pill-active-shadow: rgba(255, 107, 66, 0.15);
  --pill-hover-shadow: rgba(255, 107, 66, 0.25);
  --skill-active-bg: linear-gradient(135deg, #ff6b42, #ff8a6b);
  --generate-bg: linear-gradient(135deg, #ff6b42 0%, #ffc107 100%);
  --generate-hover-shadow: rgba(255, 107, 66, 0.4);
  --progress-fill: linear-gradient(90deg, #4ade80, #86efac, #ffc107);
  --surprise-border: #fcd34d;
  --surprise-text: #d97706;
  --surprise-hover-bg: #fffbeb;
  --checkbox-border: #d8b4fe;
  --checkbox-checked-bg: linear-gradient(135deg, #4ade80, #86efac);
  --error-bg: #fff5f2;
  --error-border: #ffd1c1;
  --error-text: #e84e24;
  --history-hover-bg: #ffe8e0;
  --material-bg: linear-gradient(135deg, #f3e8ff, #e9d5ff);
  --material-border: #d8b4fe;
  --material-text: #7c3aed;
  --coral-accent: #ff6b42;
  --step-time-bg: #fff5f2;
  --step-time-text: #ff6b42;
  --copy-text: #d8b4fe;
  --copy-hover: #c084fc;
  --input-focus-shadow: rgba(255, 107, 66, 0.15);
  --input-focus-border: #ff8a6b;
  --input-bg: #ffffff;
  --input-text: #451a03;
  --footer-border: #fef3c7;
  --footer-text: #b45309;
}

body {
  font-family: 'Bricolage Grotesque', sans-serif;
  background: var(--bg-body);
  min-height: 100vh;
  color: var(--text-primary);
  transition: background 0.4s ease, color 0.3s ease;
}

.header-gradient {
  background: var(--header-gradient);
  position: relative;
  overflow: hidden;
  transition: background 0.4s ease;
}

.header-gradient::before {
  content: '';
  position: absolute;
  top: -30px;
  right: -20px;
  width: 200px;
  height: 200px;
  background: radial-gradient(circle, rgba(255,255,255,0.15) 0%, transparent 70%);
  border-radius: 50%;
}

.header-gradient::after {
  content: '';
  position: absolute;
  bottom: -40px;
  left: 10%;
  width: 300px;
  height: 80px;
  background: radial-gradient(ellipse, rgba(255,255,255,0.1) 0%, transparent 70%);
  transform: rotate(-5deg);
}

.paint-blob {
  position: absolute;
  border-radius: 50% 40% 60% 45%;
  opacity: 0.12;
}

.paint-blob-1 {
  width: 120px;
  height: 100px;
  background: #fff;
  top: 10px;
  right: 40px;
  transform: rotate(20deg);
}

.paint-blob-2 {
  width: 80px;
  height: 70px;
  background: #fff;
  bottom: 5px;
  left: 60px;
  transform: rotate(-15deg);
}

.paint-blob-3 {
  width: 50px;
  height: 45px;
  background: #fff;
  top: 50%;
  right: 25%;
  transform: rotate(45deg);
}

/* Theme Toggle */
.theme-toggle-container {
  position: fixed;
  top: 16px;
  right: 16px;
  z-index: 100;
  display: flex;
  gap: 6px;
  background: var(--bg-card);
  border: 2px solid var(--border-color);
  border-radius: 16px;
  padding: 6px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.1);
  transition: all 0.3s ease;
}

.theme-btn {
  width: 34px;
  height: 34px;
  border-radius: 10px;
  border: 2px solid transparent;
  cursor: pointer;
  transition: all 0.25s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  background: var(--bg-secondary);
}

.theme-btn:hover {
  transform: scale(1.15);
}

.theme-btn.active {
  border-color: var(--coral-accent);
  box-shadow: 0 0 0 2px var(--pill-active-shadow);
  transform: scale(1.1);
}

.pill-btn {
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  border: 2px solid transparent;
  background: var(--bg-card);
  color: var(--text-secondary);
}

.pill-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 15px var(--pill-hover-shadow);
}

.pill-btn.active {
  border-color: var(--pill-active-border);
  background: var(--pill-active-bg);
  box-shadow: 0 0 0 3px var(--pill-active-shadow), 0 4px 15px var(--pill-hover-shadow);
  color: var(--text-primary);
}

.generate-btn {
  background: var(--generate-bg);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}

.generate-btn:hover:not(:disabled) {
  transform: scale(1.03);
  box-shadow: 0 8px 30px var(--generate-hover-shadow);
}

.generate-btn:active:not(:disabled) {
  transform: scale(0.98);
}

.generate-btn::after {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(255,255,255,0.2) 0%, transparent 60%);
  opacity: 0;
  transition: opacity 0.3s;
}

.generate-btn:hover::after {
  opacity: 1;
}

.step-card {
  animation: slideUp 0.5s cubic-bezier(0.4, 0, 0.2, 1) forwards;
  opacity: 0;
  transform: translateY(30px);
  background: var(--bg-card);
  border-color: var(--border-color);
}

/* Step card color variations */
.step-card:nth-child(6n+1) { background: color-mix(in srgb, var(--bg-card) 85%, #e9d5ff 15%); border-color: color-mix(in srgb, var(--border-color) 50%, #d8b4fe 50%); }
.step-card:nth-child(6n+2) { background: color-mix(in srgb, var(--bg-card) 85%, #dcfce7 15%); border-color: color-mix(in srgb, var(--border-color) 50%, #86efac 50%); }
.step-card:nth-child(6n+3) { background: color-mix(in srgb, var(--bg-card) 85%, #ffe8e0 15%); border-color: color-mix(in srgb, var(--border-color) 50%, #ffd1c1 50%); }
.step-card:nth-child(6n+4) { background: color-mix(in srgb, var(--bg-card) 85%, #fef3c7 15%); border-color: color-mix(in srgb, var(--border-color) 50%, #fde68a 50%); }
.step-card:nth-child(6n+5) { background: color-mix(in srgb, var(--bg-card) 85%, #f3e8ff 15%); border-color: color-mix(in srgb, var(--border-color) 50%, #e9d5ff 50%); }
.step-card:nth-child(6n+6) { background: color-mix(in srgb, var(--bg-card) 85%, #fce7f3 15%); border-color: color-mix(in srgb, var(--border-color) 50%, #fbb6ce 50%); }

@keyframes slideUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.step-number {
  font-family: 'Bricolage Grotesque', sans-serif;
  font-weight: 800;
  color: var(--coral-accent);
  background: var(--bg-card);
}

.step-title {
  color: var(--text-primary);
}

.step-desc {
  color: var(--text-secondary);
}

.checkbox-custom {
  appearance: none;
  -webkit-appearance: none;
  width: 24px;
  height: 24px;
  border: 2px solid var(--checkbox-border);
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.25s;
  position: relative;
  flex-shrink: 0;
  background: var(--bg-card);
}

.checkbox-custom:checked {
  background: var(--checkbox-checked-bg);
  border-color: #4ade80;
}

.checkbox-custom:checked::after {
  content: '✓';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: white;
  font-size: 14px;
  font-weight: 800;
}

.checked-step .step-title {
  text-decoration: line-through;
  opacity: 0.6;
}

.checked-step .step-desc {
  opacity: 0.4;
}

.progress-bar-fill {
  transition: width 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  background: var(--progress-fill);
}

.progress-bar-bg {
  background: var(--border-light);
}

@keyframes confetti-fall {
  0% { transform: translateY(-10px) rotate(0deg); opacity: 1; }
  100% { transform: translateY(100vh) rotate(720deg); opacity: 0; }
}

.confetti-piece {
  position: fixed;
  top: 0;
  width: 10px;
  height: 10px;
  animation: confetti-fall 3s ease-in forwards;
  z-index: 9999;
  pointer-events: none;
}

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

.spinner {
  border: 3px solid rgba(255,255,255,0.3);
  border-top-color: white;
  border-radius: 50%;
  width: 22px;
  height: 22px;
  animation: spin 0.7s linear infinite;
  display: inline-block;
}

.skill-toggle {
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  color: var(--text-muted);
}

.skill-toggle:hover {
  color: var(--text-secondary);
}

.skill-toggle.active {
  background: var(--skill-active-bg);
  color: white;
  box-shadow: 0 2px 10px var(--pill-active-shadow);
}

.skill-toggle-container {
  background: var(--bg-card);
  border-radius: 0.75rem;
  padding: 4px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.08);
}

.history-item {
  transition: all 0.2s;
  cursor: pointer;
  border-color: var(--border-light);
}

.history-item:hover {
  background: var(--history-hover-bg);
  transform: translateX(4px);
}

.history-panel {
  background: var(--bg-card);
  border-color: var(--border-color);
}

.history-panel-btn {
  color: var(--text-primary);
}

.history-panel-btn:hover {
  background: var(--bg-secondary);
}

.textarea-custom {
  background: var(--input-bg);
  color: var(--input-text);
  border-color: var(--border-color);
}

.textarea-custom::placeholder {
  color: var(--text-muted);
}

.textarea-custom:focus {
  box-shadow: 0 0 0 3px var(--input-focus-shadow), 0 4px 20px var(--input-focus-shadow);
  border-color: var(--input-focus-border);
}

.material-chip {
  background: var(--material-bg);
  border: 1px solid var(--material-border);
  color: var(--material-text);
}

.materials-card {
  background: var(--bg-card);
  border-color: var(--border-color);
}

.surprise-btn {
  border-color: var(--surprise-border);
  color: var(--surprise-text);
  background: var(--bg-card);
}

.surprise-btn:hover {
  background: var(--surprise-hover-bg);
}

.error-box {
  background: var(--error-bg);
  border-color: var(--error-border);
  color: var(--error-text);
}

.step-time-badge {
  background: var(--step-time-bg);
  color: var(--step-time-text);
}

.copy-btn {
  color: var(--copy-text);
  background: var(--bg-card);
}

.copy-btn:hover {
  color: var(--copy-hover);
}

.export-btn {
  color: var(--step-time-text);
  background: var(--bg-card);
  border: 1.5px solid var(--border-color);
  cursor: pointer;
  transition: all 0.25s ease;
}

.export-btn:hover {
  background: var(--step-time-bg);
  border-color: var(--step-time-text);
  transform: translateY(-1px);
  box-shadow: 0 3px 12px var(--pill-active-shadow);
}

.export-btn:active {
  transform: translateY(0);
}

.total-time-badge {
  color: var(--text-muted);
  background: var(--bg-card);
}

.regen-btn {
  border-color: var(--border-color);
  color: var(--coral-accent);
}

.regen-btn:hover {
  background: var(--bg-secondary);
}

.label-text {
  color: var(--text-secondary);
}

.plan-title {
  color: var(--text-primary);
}

.progress-text {
  color: var(--text-secondary);
}

.progress-pct {
  color: var(--coral-accent);
}

.complete-title {
  color: var(--coral-accent);
}

.complete-subtitle {
  color: var(--text-muted);
}

.history-desc {
  color: var(--text-primary);
}

.history-meta {
  color: var(--text-muted);
}

.history-empty {
  color: var(--text-muted);
}

.footer-text {
  color: var(--footer-text);
  border-color: var(--footer-border);
}

.footer-link {
  color: var(--coral-accent);
}

.footer-link:hover {
  opacity: 0.8;
}

@keyframes pulse-glow {
  0%, 100% { box-shadow: 0 0 0 0 var(--pill-active-shadow); }
  50% { box-shadow: 0 0 0 8px transparent; }
}

.surprise-btn:hover {
  animation: pulse-glow 1.5s infinite;
}

/* Reference Image Upload */
.image-drop-zone {
  border-color: var(--border-color);
  background: var(--bg-secondary);
  transition: all 0.3s ease;
}

.image-drop-zone:hover {
  border-color: var(--coral-accent);
  background: var(--bg-card);
  box-shadow: 0 0 0 3px var(--input-focus-shadow);
}

.image-drop-zone.drag-over {
  border-color: var(--coral-accent);
  background: var(--bg-card);
  box-shadow: 0 0 0 4px var(--input-focus-shadow), 0 8px 30px var(--input-focus-shadow);
  transform: scale(1.01);
}

.drop-zone-text {
  color: var(--text-secondary);
}

.drop-zone-subtext {
  color: var(--text-muted);
}

.ref-image-hint {
  color: var(--text-muted);
}

.ref-images-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 12px;
}

.ref-image-preview {
  position: relative;
  border-radius: 16px;
  overflow: hidden;
  border: 2px solid var(--border-color);
  background: var(--bg-card);
  transition: all 0.25s ease;
  animation: slideUp 0.4s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

.ref-image-preview:hover {
  border-color: var(--coral-accent);
  box-shadow: 0 4px 15px var(--pill-active-shadow);
  transform: translateY(-2px);
}

.ref-image-img {
  width: 100%;
  height: 120px;
  object-fit: cover;
  display: block;
}

.ref-image-remove {
  position: absolute;
  top: 6px;
  right: 6px;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: rgba(0, 0, 0, 0.6);
  color: white;
  border: none;
  cursor: pointer;
  font-size: 12px;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
  opacity: 0;
  backdrop-filter: blur(4px);
}

.ref-image-preview:hover .ref-image-remove {
  opacity: 1;
}

.ref-image-remove:hover {
  background: var(--error-text);
  transform: scale(1.15);
}

.ref-image-name {
  display: block;
  padding: 6px 10px;
  font-size: 11px;
  font-weight: 600;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.hidden {
  display: none;
}

@media (max-width: 640px) {
  .header-gradient {
    padding: 1.5rem 1rem !important;
  }
  .theme-toggle-container {
    top: 8px;
    right: 8px;
    padding: 4px;
    gap: 4px;
  }
  .theme-btn {
    width: 28px;
    height: 28px;
    font-size: 13px;
    border-radius: 8px;
  }
  .ref-images-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .ref-image-remove {
    opacity: 1;
  }
}