/* CSS Filter 플레이그라운드 전용 스타일 */

nav { max-width: 920px; }
main { max-width: 920px; }

.preview-stage {
  display: flex;
  align-items: center;
  justify-content: center;
  background: repeating-conic-gradient(#e5e7eb 0% 25%, #f9fafb 0% 50%) 50% / 24px 24px;
  border: 1px solid var(--border);
  border-radius: 14px;
  margin-bottom: 1rem;
  padding: 1.5rem;
  min-height: 300px;
  overflow: hidden;
}

.preview-target {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  max-width: 100%;
}

#preview-img {
  display: block;
  max-width: 100%;
  max-height: 320px;
  border-radius: 10px;
  background: #fff;
  transition: filter 0.1s linear;
}

.preview-text {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: -apple-system, BlinkMacSystemFont, "Helvetica Neue", "Noto Sans KR", sans-serif;
  font-size: 56px;
  font-weight: 800;
  color: #ffffff;
  text-shadow: 0 2px 8px rgba(0, 0, 0, 0.4);
  pointer-events: none;
  letter-spacing: -0.02em;
  transition: filter 0.1s linear;
}

.preview-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  align-items: center;
  margin-bottom: 1rem;
  padding: 0.6rem 0.85rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
}

.ctrl-group {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  flex-wrap: wrap;
}

.ctrl-label {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-sub);
  margin-right: 0.2rem;
}

.mode-btn {
  padding: 0.35rem 0.75rem;
  font-size: 0.78rem;
  font-weight: 600;
  background: var(--bg);
  color: var(--text-sub);
  border: 1px solid var(--border);
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.15s;
}
.mode-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
}
.mode-btn.active {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

.upload-btn {
  display: inline-flex;
  align-items: center;
  padding: 0.4rem 0.85rem;
  font-size: 0.82rem;
  font-weight: 600;
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 7px;
  cursor: pointer;
  transition: all 0.15s;
  margin-left: auto;
}
.upload-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.reset-all-btn {
  padding: 0.4rem 0.85rem;
  font-size: 0.78rem;
  font-weight: 600;
  background: var(--bg);
  color: var(--text-sub);
  border: 1px solid var(--border);
  border-radius: 7px;
  cursor: pointer;
  transition: all 0.15s;
}
.reset-all-btn:hover {
  border-color: var(--error);
  color: var(--error);
}

/* 필터 그리드 */
.filters {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.55rem;
  margin-bottom: 1rem;
}

.filter-card {
  padding: 0.65rem 0.8rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 9px;
}

.filter-head {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  margin-bottom: 0.4rem;
}

.filter-name {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--text);
  flex: 1;
}

.filter-num {
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.74rem;
  font-weight: 600;
  color: var(--text-sub);
}

.filter-reset {
  width: 22px;
  height: 22px;
  font-size: 0.85rem;
  line-height: 1;
  background: transparent;
  color: var(--text-sub);
  border: 1px solid var(--border);
  border-radius: 50%;
  cursor: pointer;
  transition: all 0.15s;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.filter-reset:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.filter-slider {
  width: 100%;
  accent-color: var(--primary);
}

/* 출력 */
.output {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
}

.output-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.55rem 0.9rem;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
}

.output-label {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--text-sub);
}

.btn-copy {
  padding: 0.3rem 0.7rem;
  font-size: 0.75rem;
  background: var(--surface);
  color: var(--text-sub);
  border: 1px solid var(--border);
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.15s;
}
.btn-copy:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.output-code {
  padding: 0.85rem 0.95rem;
  margin: 0;
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.85rem;
  color: var(--text);
  white-space: pre-wrap;
  word-break: break-all;
  line-height: 1.5;
}

@media (max-width: 720px) {
  .filters { grid-template-columns: repeat(2, 1fr); }
  .preview-text { font-size: 44px; }
}

@media (max-width: 480px) {
  .filters { grid-template-columns: 1fr; }
  .preview-stage { min-height: 240px; padding: 1rem; }
  .preview-text { font-size: 36px; }
  .upload-btn { margin-left: 0; }
  .preview-controls { gap: 0.4rem; }
}