:root {
  /* Light Theme (Default) - Soft Grey, zero ultra-white glare */
  --bg: #e2e8f0;
  --bg-gradient-top: #eceff4;
  --bg-soft: #cbd5e1;
  --card: #f8fafc;
  --card-border: #cbd5e1;
  --card-border-hover: #94a3b8;
  --info-bg: #e0e7ff;
  --info-border: #a5b4fc;
  --info-text: #1e1b4b;
  --text: #0f172a;
  --text-muted: #475569;
  --text-subtle: #64748b;
  --accent: #4f46e5;
  --accent-hover: #4338ca;
  --accent-2: #0284c7;
  --danger: #e11d48;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow: 0 8px 24px rgba(15, 23, 42, 0.08);
  --shadow-glow: 0 0 20px rgba(79, 70, 229, 0.15);
  --input-bg: #ffffff;
  --input-border: #cbd5e1;
  font-size: 16px;
}

[data-theme="dark"] {
  /* Dark Theme */
  --bg: #0b0f19;
  --bg-gradient-top: #131b2e;
  --bg-soft: #162035;
  --card: #111827;
  --card-border: rgba(255, 255, 255, 0.08);
  --card-border-hover: rgba(99, 102, 241, 0.4);
  --info-bg: rgba(30, 41, 59, 0.7);
  --info-border: rgba(99, 102, 241, 0.25);
  --info-text: #94a3b8;
  --text: #f8fafc;
  --text-muted: #94a3b8;
  --text-subtle: #64748b;
  --accent: #6366f1;
  --accent-hover: #4f46e5;
  --accent-2: #06b6d4;
  --danger: #f43f5e;
  --shadow: 0 12px 32px rgba(0, 0, 0, 0.35);
  --shadow-glow: 0 0 25px rgba(99, 102, 241, 0.25);
  --input-bg: #0f172a;
  --input-border: rgba(255, 255, 255, 0.14);
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  background-color: var(--bg);
  background-image: 
    radial-gradient(ellipse at 50% 0%, rgba(99, 102, 241, 0.12) 0%, transparent 65%),
    radial-gradient(ellipse at 80% 100%, rgba(6, 182, 212, 0.06) 0%, transparent 50%);
  background-attachment: fixed;
  color: var(--text);
  font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  min-height: 100vh;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  transition: background-color 0.3s ease, color 0.3s ease;
}

/* Header & Navigation */
.topbar {
  padding: 2.2rem 1.5rem 1.2rem;
}

.topbar-inner {
  max-width: 980px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 1.8rem;
  font-weight: 800;
  letter-spacing: -0.025em;
  color: var(--text);
}

.brand-icon {
  font-size: 2rem;
  filter: drop-shadow(0 2px 8px rgba(99, 102, 241, 0.4));
}

.theme-toggle-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--card);
  border: 1px solid var(--card-border);
  color: var(--text);
  padding: 0.55rem 1.1rem;
  border-radius: 999px;
  font-size: 0.875rem;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  box-shadow: var(--shadow);
  transition: all 0.25s ease;
  user-select: none;
}

.theme-toggle-btn:hover {
  border-color: var(--accent);
  transform: translateY(-1px);
  box-shadow: var(--shadow-glow);
}

.tagline {
  max-width: 580px;
  margin: 0.85rem auto 0;
  color: var(--text-muted);
  font-size: 1.05rem;
  font-weight: 400;
  text-align: center;
}

/* Layout Wrapper */
.wrapper {
  max-width: 980px;
  margin: 0 auto;
  padding: 0 1.25rem 4rem;
}

/* Info Banner */
.info-banner {
  background: var(--info-bg);
  border: 1px solid var(--info-border);
  border-left: 4px solid var(--accent);
  border-radius: var(--radius);
  padding: 1.1rem 1.4rem;
  font-size: 0.95rem;
  color: var(--info-text);
  margin-bottom: 2rem;
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow);
  transition: all 0.3s ease;
}

.info-banner strong {
  color: var(--text);
  font-weight: 700;
}

/* Step Indicator */
.steps {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
  margin-bottom: 2.2rem;
}

.step {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-muted);
  padding: 0.5rem 1.1rem;
  border-radius: 999px;
  border: 1px solid var(--card-border);
  background: var(--card);
  box-shadow: var(--shadow);
  transition: all 0.25s ease;
}

.step span {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--bg-soft);
  color: var(--text-muted);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 700;
  transition: all 0.25s ease;
}

.step.active {
  color: var(--text);
  border-color: var(--accent);
  background: var(--card);
  box-shadow: var(--shadow-glow);
}

.step.active span {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #ffffff;
  box-shadow: 0 2px 8px rgba(99, 102, 241, 0.4);
}

/* Card UI Component */
.card {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 1.8rem;
  box-shadow: var(--shadow);
  margin-bottom: 1.8rem;
  transition: background-color 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
  border-color: var(--card-border-hover);
}

.card h2 {
  margin-top: 0;
  margin-bottom: 0.5rem;
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text);
}

/* Recommendation Card */
.recommendation-card {
  text-align: center;
}

.recommendation-image-wrap {
  display: flex;
  justify-content: center;
  margin-top: 1.2rem;
}

.recommendation-image-wrap img {
  width: 100%;
  max-width: 440px;
  height: auto;
  border-radius: 12px;
  border: 1px solid var(--card-border);
  box-shadow: var(--shadow);
  display: block;
}

/* Editor Grid Layout */
.editor-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.6rem;
  margin: 0 0 1.8rem;
}

.editor-card {
  margin-bottom: 0;
  display: flex;
  flex-direction: column;
}

/* Upload Zone */
.upload-zone {
  border: 2px dashed var(--card-border);
  border-radius: 14px;
  background: var(--bg-gradient-top);
  transition: all 0.25s ease;
  margin-top: 0.5rem;
}

.upload-zone:hover,
.upload-zone.dragover {
  border-color: var(--accent);
  background: rgba(99, 102, 241, 0.08);
  box-shadow: var(--shadow-glow);
}

.upload-label {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  padding: 2.8rem 1.2rem;
  cursor: pointer;
  color: var(--text-muted);
  text-align: center;
  font-size: 0.95rem;
  transition: color 0.2s ease;
}

.upload-zone:hover .upload-label {
  color: var(--text);
}

.upload-label strong {
  color: var(--text);
  font-weight: 600;
}

.upload-icon {
  font-size: 2.2rem;
  display: inline-block;
  transition: transform 0.2s ease;
}

.upload-zone:hover .upload-icon {
  transform: translateY(-3px) scale(1.05);
}

/* Canvas Wrapper */
.canvas-wrap {
  position: relative;
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--card-border);
  background: #070a12;
  margin-top: 1rem;
  box-shadow: inset 0 0 20px rgba(0, 0, 0, 0.8);
}

.canvas-wrap canvas {
  display: block;
  width: 100%;
  height: auto;
  cursor: crosshair;
  touch-action: none;
}

/* Canvas Hint - Positioned cleanly BELOW the canvas image */
.canvas-hint {
  position: relative;
  background: var(--card);
  color: var(--text-muted);
  font-size: 0.82rem;
  padding: 0.65rem 0.85rem;
  text-align: center;
  border-top: 1px solid var(--card-border);
}

/* Tools Toolbar */
.tools {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 1rem;
}

.tool-btn {
  border: 1px solid var(--card-border);
  background: var(--card);
  color: var(--text);
  padding: 0.6rem 0.9rem;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
}

.tool-btn:hover {
  background: var(--bg-soft);
  border-color: var(--accent);
  transform: translateY(-1px);
}

.tool-btn:active {
  transform: translateY(0) scale(0.97);
}

.tool-btn.selected {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #ffffff;
  border-color: transparent;
  font-weight: 700;
  box-shadow: 0 4px 14px rgba(99, 102, 241, 0.4);
}

.tool-secondary {
  opacity: 0.9;
}

/* Form Controls & Inputs */
.watermark-card .field-row {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  margin-bottom: 1.2rem;
}

.field-row label {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-muted);
}

select, input[type="text"] {
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  color: var(--text);
  padding: 0.75rem 0.9rem;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-family: inherit;
  outline: none;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
  width: 100%;
}

select:focus, input[type="text"]:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.25);
}

select option {
  background: var(--input-bg);
  color: var(--text);
}

/* Checkbox Row */
.checkbox-row {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 0.9rem;
  cursor: pointer;
  user-select: none;
}

.checkbox-row input[type="checkbox"] {
  width: 18px;
  height: 18px;
  margin-top: 0.15rem;
  accent-color: var(--accent);
  cursor: pointer;
}

.checkbox-row em {
  color: var(--text);
  font-style: normal;
  font-weight: 600;
}

/* Helper Text */
.muted {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.muted.small {
  font-size: 0.825rem;
  margin-top: 0.75rem;
  min-height: 1.2em;
}

/* Main Action Card */
.action-card {
  text-align: center;
}

.primary-btn {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #ffffff;
  border: none;
  padding: 1.05rem 2.6rem;
  border-radius: 12px;
  font-size: 1.05rem;
  font-weight: 700;
  font-family: inherit;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease, opacity 0.2s ease;
  box-shadow: 0 10px 25px rgba(79, 70, 229, 0.3);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.primary-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  box-shadow: none;
  filter: grayscale(40%);
}

.primary-btn:not(:disabled):hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 30px rgba(79, 70, 229, 0.4);
}

.primary-btn:not(:disabled):active {
  transform: translateY(0);
}

/* Footer */
.page-footer {
  text-align: center;
  color: var(--text-subtle);
  font-size: 0.825rem;
  margin-top: 2.5rem;
  line-height: 1.6;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* Responsive Breakpoints */
@media (max-width: 768px) {
  .wrapper {
    padding: 0 1rem 3rem;
  }
  .editor-grid {
    grid-template-columns: 1fr;
    gap: 1.25rem;
  }
  .card {
    padding: 1.4rem;
  }
  .steps {
    gap: 0.5rem;
  }
  .step {
    padding: 0.4rem 0.8rem;
    font-size: 0.8rem;
  }
}

@media (max-width: 480px) {
  .topbar {
    padding: 1.5rem 1rem 1rem;
  }
  .topbar-inner {
    flex-direction: row;
  }
  .brand {
    font-size: 1.4rem;
  }
  .brand-icon {
    font-size: 1.6rem;
  }
  .theme-toggle-btn {
    padding: 0.45rem 0.8rem;
    font-size: 0.8rem;
  }
  .tagline {
    font-size: 0.95rem;
  }
  .card {
    padding: 1.2rem;
    border-radius: 12px;
  }
  .upload-label {
    padding: 2rem 0.8rem;
    font-size: 0.875rem;
  }
  .primary-btn {
    width: 100%;
    padding: 1rem 1.5rem;
  }
  .tools {
    gap: 0.4rem;
  }
  .tool-btn {
    flex: 1 1 calc(50% - 0.4rem);
    padding: 0.6rem 0.5rem;
    font-size: 0.8rem;
  }
}