:root {
  --bg: #05060c;
  --panel: #0f111c;
  --panel-alt: #15182a;
  --border: rgba(255, 255, 255, 0.08);
  --accent: #5de4c7;
  --accent-strong: #2dd4bf;
  --text: #f8fafc;
  --muted: #9fa5b4;
  --danger: #ff6b6b;
  font-size: 16px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: radial-gradient(circle at top, #171b2e 0%, #05060c 45%);
  color: var(--text);
  min-height: 100vh;
}

.page {
  max-width: 1200px;
  margin: 0 auto;
  padding: 3rem 1.5rem 4rem;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.site-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1.5rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.brand h1 {
  margin: 0;
  font-size: 1.65rem;
}

.brand p {
  margin: 0.2rem 0 0;
  color: var(--muted);
}

.logo {
  width: 3.5rem;
  height: 3.5rem;
  border-radius: 1rem;
  background: linear-gradient(135deg, #38bdf8, #7c3aed);
  display: grid;
  place-items: center;
  font-weight: 600;
  letter-spacing: 0.05em;
}

.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.55rem 0.9rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.04);
  font-size: 0.9rem;
  color: var(--muted);
}

.status-pill .dot {
  width: 0.55rem;
  height: 0.55rem;
  border-radius: 999px;
  background: var(--muted);
  display: inline-block;
}

.layout {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.5rem;
}

.panel {
  padding: 1.75rem;
  border-radius: 1.5rem;
  border: 1px solid var(--border);
  background: var(--panel);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.35);
}

.panel.info {
  background: var(--panel-alt);
}

.panel h2 {
  margin-top: 0;
  margin-bottom: 0.6rem;
}

.panel p,
.panel small,
.panel li {
  color: var(--muted);
}

.upload .dropzone,
.remove-bg .dropzone {
  margin-top: 1rem;
  display: block;
  border: 1.5px dashed rgba(255, 255, 255, 0.18);
  border-radius: 1rem;
  padding: 2.5rem 1.25rem;
  background: rgba(255, 255, 255, 0.02);
  cursor: pointer;
  transition: border-color 0.2s ease, background 0.2s ease;
}

.upload .dropzone.dragover,
.remove-bg .dropzone.dragover {
  border-color: var(--accent);
  background: rgba(93, 228, 199, 0.07);
}

.dropzone__content {
  text-align: center;
  color: var(--muted);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.4rem;
}

.dropzone__content span {
  color: var(--accent);
  font-weight: 600;
}

.toggles {
  margin: 1.25rem 0 1.5rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1rem;
}

.toggles label {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.9rem;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid transparent;
  cursor: pointer;
  transition: border-color 0.2s ease;
}

.toggles input[type='checkbox'] {
  accent-color: var(--accent);
}

.primary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.9rem 1.2rem;
  border-radius: 0.9rem;
  border: none;
  background: linear-gradient(135deg, #2dd4bf, #2563eb);
  color: #0a0c14;
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  transition: opacity 0.2s ease;
}

.primary:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.ghost {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border);
  border-radius: 0.7rem;
  color: var(--text);
  padding: 0.4rem 0.8rem;
  cursor: pointer;
  font-size: 0.85rem;
  transition: border-color 0.2s ease;
}

.ghost:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.progress {
  margin-top: 1.5rem;
  padding: 0.85rem 1rem;
  border-radius: 1rem;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(255, 255, 255, 0.03);
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.spinner {
  width: 2.2rem;
  height: 2.2rem;
  border-radius: 50%;
  border: 3px solid rgba(255, 255, 255, 0.12);
  border-top-color: var(--accent);
  animation: spin 1s linear infinite;
}

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

.results-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1rem;
}

.result-card {
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 1.2rem;
  padding: 1rem;
  background: rgba(255, 255, 255, 0.02);
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
}

.result-card header {
  display: flex;
  justify-content: space-between;
  gap: 0.6rem;
  align-items: center;
}

.result-preview {
  min-height: 240px;
  background: rgba(4, 6, 12, 0.8);
  border-radius: 1rem;
  border: 1px dashed rgba(255, 255, 255, 0.08);
  display: grid;
  place-items: center;
  overflow: hidden;
  position: relative;
}

.result-preview canvas,
.result-preview img,
.result-preview video {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.placeholder {
  margin: 0;
  padding: 0 1.5rem;
  text-align: center;
  color: var(--muted);
}

.controls label {
  display: flex;
  flex-direction: column;
  font-size: 0.9rem;
  gap: 0.3rem;
  color: var(--muted);
}

.controls input[type='range'] {
  accent-color: var(--accent);
}

.info ol {
  padding-left: 1.2rem;
  line-height: 1.7;
}

.info code {
  background: rgba(255, 255, 255, 0.08);
  padding: 0.15rem 0.35rem;
  border-radius: 0.4rem;
}

.muted {
  color: var(--muted);
}

.nav-tabs {
  display: flex;
  gap: 0.5rem;
  padding: 0;
  margin: -1rem 0 1rem;
  border-bottom: 1px solid var(--border);
}

.nav-tab {
  padding: 0.75rem 1.25rem;
  color: var(--muted);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.nav-tab:hover {
  color: var(--text);
}

.nav-tab.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  margin-bottom: 1rem;
}

.form-group label {
  font-size: 0.9rem;
  color: var(--muted);
  font-weight: 500;
}

.form-group textarea,
.form-group input[type="number"],
.form-group select {
  padding: 0.7rem 0.9rem;
  border-radius: 0.7rem;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.04);
  color: var(--text);
  font-family: inherit;
  font-size: 0.95rem;
  transition: border-color 0.2s ease, background 0.2s ease;
}

.form-group textarea:focus,
.form-group input[type="number"]:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--accent);
  background: rgba(255, 255, 255, 0.06);
}

.form-group textarea {
  resize: vertical;
  min-height: 80px;
}

.form-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 1rem;
}

@media (max-width: 720px) {
  .site-header {
    flex-direction: column;
    align-items: flex-start;
  }
  .layout {
    grid-template-columns: 1fr;
  }
  .results-grid {
    grid-template-columns: 1fr;
  }
  .form-row {
    grid-template-columns: 1fr;
  }
}