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

:root {
  --bg-primary: #060609;
  --bg-secondary: rgba(20, 20, 30, 0.8);
  --accent: #8b5cf6;
  --accent-dark: #6366f1;
  --accent-light: #22d3ee;
  --text-primary: #f1f5f9;
  --text-secondary: rgba(255, 255, 255, 0.6);
  --text-tertiary: rgba(255, 255, 255, 0.35);
  --border: rgba(255, 255, 255, 0.09);
}

body {
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Inter', sans-serif;
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.container {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
  padding: 0 20px;
}

/* ─── Header ───────────────────────────────────────────────────── */
.header {
  text-align: center;
  padding: 40px 0;
  border-bottom: 1px solid var(--border);
}

.logo {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-bottom: 10px;
}

.logo svg {
  width: 32px;
  height: 32px;
}

.logo h1 {
  font-size: 28px;
  font-weight: 800;
  letter-spacing: -0.03em;
  background: linear-gradient(90deg, #e2e8f0, #94a3b8);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.tagline {
  font-size: 14px;
  color: var(--text-secondary);
  margin-top: 8px;
}

/* ─── Main ─────────────────────────────────────────────────────── */
.main {
  flex: 1;
  padding: 60px 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* ─── Upload Section ───────────────────────────────────────────── */
.upload-section {
  width: 100%;
  max-width: 600px;
}

.upload-box {
  border: 2px dashed var(--border);
  border-radius: 16px;
  padding: 60px 40px;
  text-align: center;
  background: rgba(139, 92, 246, 0.05);
  cursor: pointer;
  transition: all 0.2s;
}

.upload-box:hover {
  border-color: var(--accent);
  background: rgba(139, 92, 246, 0.10);
}

.upload-box.dragover {
  border-color: var(--accent);
  background: rgba(139, 92, 246, 0.15);
}

.upload-icon {
  width: 48px;
  height: 48px;
  color: var(--accent);
  margin: 0 auto 20px;
  opacity: 0.8;
}

.upload-title {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 8px;
}

.upload-sub {
  font-size: 14px;
  color: var(--text-tertiary);
}

/* ─── Buttons ───────────────────────────────────────────────────── */
.btn {
  padding: 12px 28px;
  border: none;
  border-radius: 100px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  color: white;
  box-shadow: 0 4px 24px rgba(139, 92, 246, 0.45);
  margin-top: 20px;
  width: 100%;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 36px rgba(139, 92, 246, 0.60);
}

.btn-secondary {
  background: rgba(139, 92, 246, 0.15);
  color: #a78bfa;
  border: 1px solid rgba(139, 92, 246, 0.30);
}

.btn-secondary:hover {
  background: rgba(139, 92, 246, 0.25);
}

.btn-ghost {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-secondary);
  border: 1px solid rgba(255, 255, 255, 0.12);
}

.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.10);
  color: var(--text-primary);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* ─── Preview Section ───────────────────────────────────────────── */
.preview-section {
  width: 100%;
  max-width: 700px;
  margin: 0 auto;
}

.comparison {
  display: grid;
  grid-template-columns: 1fr 1px 1fr;
  gap: 16px;
  margin-bottom: 28px;
  background: rgba(10, 10, 18, 0.95);
  border: 1px solid var(--border);
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 40px 100px rgba(0, 0, 0, 0.70);
}

.comparison-item {
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.comparison-label {
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-tertiary);
}

.comparison-img {
  width: 100%;
  height: 300px;
  object-fit: cover;
  border-radius: 8px;
  background: rgba(0, 0, 0, 0.3);
}

.divider {
  width: 1px;
  background: var(--border);
}

/* Spinner ──────────────────────────────────────────────────────── */
.spinner {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 300px;
}

.spinner-inner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

/* ─── Actions ───────────────────────────────────────────────────── */
.actions {
  display: flex;
  gap: 12px;
  margin-bottom: 20px;
}

.actions .btn {
  flex: 1;
}

/* ─── Status ────────────────────────────────────────────────────── */
.status {
  padding: 12px 16px;
  border-radius: 8px;
  background: rgba(52, 211, 153, 0.10);
  border: 1px solid rgba(52, 211, 153, 0.25);
  color: #6ee7b7;
  font-size: 13px;
  text-align: center;
}

.status.error {
  background: rgba(239, 68, 68, 0.10);
  border-color: rgba(239, 68, 68, 0.25);
  color: #fca5a5;
}

/* ─── Footer ────────────────────────────────────────────────────── */
.footer {
  border-top: 1px solid var(--border);
  padding: 24px 0;
  text-align: center;
  font-size: 12px;
  color: var(--text-tertiary);
}

/* ─── Responsive ────────────────────────────────────────────────── */
@media (max-width: 640px) {
  .logo h1 {
    font-size: 24px;
  }

  .upload-box {
    padding: 40px 24px;
  }

  .comparison {
    grid-template-columns: 1fr;
  }

  .divider {
    display: none;
  }

  .comparison-img {
    height: 200px;
  }

  .actions {
    flex-direction: column;
  }

  .main {
    padding: 40px 0;
  }
}