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

:root {
  --purple: #7c3aed;
  --blue: #2563eb;
  --bg: #0f172a;
  --surface: #1e293b;
  --surface2: #334155;
  --text: #f1f5f9;
  --text-muted: #94a3b8;
  --border: #334155;
  --gradient: linear-gradient(135deg, var(--purple), var(--blue));
  --radius: 16px;
}

body { background: var(--bg); color: var(--text); font-family: system-ui, -apple-system, sans-serif; min-height: 100vh; }

.app { max-width: 760px; margin: 0 auto; padding: 24px 16px 60px; display: flex; flex-direction: column; gap: 20px; }

/* Header */
.header { display: flex; align-items: center; gap: 16px; padding: 24px 0 8px; }
.header-logo { width: 52px; height: 52px; object-fit: contain; }
.header-title { font-size: 28px; font-weight: 900; background: var(--gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.header-sub { font-size: 13px; color: var(--text-muted); margin-top: 2px; }

/* Card */
.card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 28px; display: flex; flex-direction: column; gap: 20px; }

/* Step title */
.step-title { font-size: 18px; font-weight: 700; display: flex; align-items: center; gap: 12px; }
.step-num { background: var(--gradient); color: #fff; width: 28px; height: 28px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 13px; font-weight: 800; flex-shrink: 0; }

/* Template grid */
.template-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
@media (min-width: 480px) { .template-grid { grid-template-columns: repeat(4, 1fr); } }

.template-card { background: var(--surface2); border: 2px solid transparent; border-radius: 12px; padding: 16px 8px; cursor: pointer; display: flex; flex-direction: column; align-items: center; gap: 8px; font-size: 13px; font-weight: 600; color: var(--text-muted); transition: all 0.2s; }
.template-card:hover { border-color: var(--purple); color: var(--text); }
.template-card.active { border-color: var(--purple); color: var(--text); background: rgba(124,58,237,0.1); }
.template-icon { font-size: 28px; }

/* Format buttons */
.format-group { display: flex; gap: 10px; flex-wrap: wrap; }
.format-btn { flex: 1; min-width: 120px; background: var(--surface2); border: 2px solid transparent; border-radius: 10px; padding: 10px 16px; font-size: 13px; font-weight: 600; color: var(--text-muted); cursor: pointer; transition: all 0.2s; }
.format-btn:hover { border-color: var(--blue); color: var(--text); }
.format-btn.active { border-color: var(--blue); color: var(--text); background: rgba(37,99,235,0.15); }

/* Fields */
.field-group { display: flex; flex-direction: column; gap: 8px; }
.field-label { font-size: 13px; font-weight: 600; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.05em; }
.text-input, .select-input, textarea { background: var(--surface2); border: 1px solid var(--border); border-radius: 10px; color: var(--text); font-size: 15px; padding: 12px 16px; width: 100%; outline: none; transition: border-color 0.2s; font-family: inherit; }
.text-input:focus, .select-input:focus, textarea:focus { border-color: var(--purple); }
textarea { resize: vertical; min-height: 80px; }
.select-input { cursor: pointer; }

/* Slider */
.slider { -webkit-appearance: none; width: 100%; height: 6px; border-radius: 3px; background: var(--surface2); outline: none; }
.slider::-webkit-slider-thumb { -webkit-appearance: none; width: 20px; height: 20px; border-radius: 50%; background: var(--gradient); cursor: pointer; }

/* Upload zone */
@keyframes zone-pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(124,58,237,0); }
  50%       { box-shadow: 0 0 0 6px rgba(124,58,237,0.25); }
}
@keyframes zone-bounce-icon {
  0%, 100% { transform: translateY(0) scale(1); }
  40%       { transform: translateY(-6px) scale(1.15); }
  70%       { transform: translateY(-2px) scale(1.05); }
}
.upload-zone {
  border: 2px dashed var(--border);
  border-radius: 12px;
  padding: 28px;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s, transform 0.15s;
  color: var(--text-muted);
  font-size: 14px;
  position: relative;
}
.upload-zone:hover { border-color: var(--purple); color: var(--text); background: rgba(124,58,237,0.04); }
.upload-zone.drag-over {
  border-color: var(--purple);
  border-style: solid;
  color: var(--text);
  background: rgba(124,58,237,0.10);
  transform: scale(1.015);
  animation: zone-pulse 0.8s ease-in-out infinite;
}
.upload-zone.drag-over .drop-icon {
  display: inline-block;
  animation: zone-bounce-icon 0.6s ease-in-out infinite;
}
.upload-zone .drop-hint {
  display: block;
  font-size: 12px;
  margin-top: 6px;
  color: var(--text-muted);
  opacity: 0;
  transform: translateY(4px);
  transition: opacity 0.2s, transform 0.2s;
}
.upload-zone.drag-over .drop-hint {
  opacity: 1;
  transform: translateY(0);
}
.upload-preview { max-width: 200px; max-height: 150px; border-radius: 8px; margin-top: 12px; object-fit: cover; }
.media-previews { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }
.media-thumb { position: relative; width: 80px; height: 80px; border-radius: 8px; overflow: hidden; border: 1px solid var(--border); }
.media-thumb img, .media-thumb video { width: 100%; height: 100%; object-fit: cover; }
.media-thumb .remove-media { position: absolute; top: 2px; right: 2px; background: rgba(0,0,0,0.7); border: none; color: #fff; border-radius: 50%; width: 18px; height: 18px; font-size: 10px; cursor: pointer; display: flex; align-items: center; justify-content: center; }
.media-thumb .media-type-badge { position: absolute; bottom: 2px; left: 2px; background: rgba(124,58,237,0.8); color: #fff; font-size: 9px; padding: 1px 4px; border-radius: 3px; font-weight: 700; }

/* Preset grid */
.preset-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; }
@media (min-width: 480px) { .preset-grid { grid-template-columns: repeat(4, 1fr); } }
.preset-btn { background: var(--surface2); border: 2px solid transparent; border-radius: 10px; padding: 12px 8px; font-size: 13px; font-weight: 600; color: var(--text-muted); cursor: pointer; transition: all 0.2s; }
.preset-btn:hover { border-color: var(--purple); color: var(--text); }
.preset-btn.active { border-color: var(--purple); color: var(--text); background: rgba(124,58,237,0.15); }

/* Effects grid */
.effects-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
.toggle-label { display: flex; align-items: center; gap: 10px; font-size: 14px; cursor: pointer; padding: 10px 14px; background: var(--surface2); border-radius: 10px; border: 1px solid var(--border); transition: border-color 0.2s; }
.toggle-label:hover { border-color: var(--purple); }
.toggle-label input { accent-color: var(--purple); width: 16px; height: 16px; }

/* Slides */
.slides-container { display: flex; flex-direction: column; gap: 12px; }
.slide-item { background: var(--surface2); border: 1px solid var(--border); border-radius: 12px; padding: 16px; display: flex; flex-direction: column; gap: 10px; }
.slide-header { display: flex; justify-content: space-between; align-items: center; }
.slide-num { font-size: 12px; font-weight: 700; color: var(--purple); text-transform: uppercase; letter-spacing: 0.1em; }
.remove-slide { background: none; border: none; color: var(--text-muted); cursor: pointer; font-size: 18px; padding: 0 4px; }
.remove-slide:hover { color: #f87171; }
.add-slide-btn { background: none; border: 2px dashed var(--border); border-radius: 10px; color: var(--text-muted); padding: 12px; font-size: 14px; cursor: pointer; transition: all 0.2s; }
.add-slide-btn:hover { border-color: var(--purple); color: var(--text); }

/* Render section */
.render-section { align-items: center; gap: 16px; }
.render-btn { background: var(--gradient); border: none; border-radius: 100px; color: #fff; cursor: pointer; font-size: 18px; font-weight: 800; padding: 20px 60px; transition: all 0.2s; letter-spacing: 0.02em; box-shadow: 0 8px 32px rgba(124,58,237,0.4); }
.render-btn:hover { transform: translateY(-2px); box-shadow: 0 12px 40px rgba(124,58,237,0.6); }
.render-btn:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }

/* Progress */
.progress-bar-wrap { background: var(--surface2); border-radius: 100px; height: 8px; width: 100%; overflow: hidden; }
.progress-bar { height: 100%; background: var(--gradient); border-radius: 100px; transition: width 0.3s ease; width: 0%; }
.progress-text { font-size: 14px; color: var(--text-muted); text-align: center; }
.success-msg { font-size: 18px; font-weight: 700; color: #4ade80; text-align: center; }
.error-msg { font-size: 14px; color: #f87171; text-align: center; }