:root {
  --bg: #f4f6fb;
  --card: #ffffff;
  --text: #111;
  --muted: #666;
  --accent: #4f5bd5;
}
.seo-content {
    text-align: center;
}
ul {
    list-style: none;
}
footer {
    text-align: center;
}

body {
  margin: 0;
  font-family: Inter, system-ui, sans-serif;
  background: var(--bg);
  justify-content: center;
  padding: 60px 20px;
}

.app {
  background: var(--card);
  width: 420px;
  padding: 32px;
  border-radius: 22px;
  box-shadow: 0 25px 60px rgba(0,0,0,.08);
  text-align: center;
  margin: 0 auto;
}

h1 {
  margin: 0;
  font-size: 24px;
}

.subtitle {
  margin: 8px 0 28px;
  font-size: 14px;
  color: var(--muted);
}

/* Upload box */
.dropzone {
  /*border: 2px dashed #d7dbff;*/
  border-radius: 18px;
  padding: 36px 20px;
  cursor: pointer;
  transition: 0.25s ease;
}


.dropzone input {
  display: none;
}

.drop-content {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.drop-content span {
  font-size: 28px;
}

.drop-content strong {
  font-size: 16px;
}

.drop-content small {
  font-size: 13px;
  color: var(--muted);
}

/* Quality */
.quality-box {
  margin-top: 26px;
  padding: 16px;
  background: #f7f8ff;
  border-radius: 14px;
}

.quality-header {
  display: flex;
  justify-content: space-between;
  font-size: 14px;
  margin-bottom: 10px;
}

input[type="range"] {
  width: 100%;
  accent-color: var(--accent);
}

/* Spinner */
.spinner {
  display: none;
  width: 36px;
  height: 36px;
  margin: 30px auto;
  border: 4px solid #ddd;
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

/* Results */
.results {
  margin-top: 30px;
}

.result {
  margin-bottom: 24px;
}

.compare {
  display: flex;
  gap: 10px;
}

.compare img {
  width: 50%;
  border-radius: 12px;
}

.download {
  display: inline-block;
  margin-top: 12px;
  padding: 10px 16px;
  background: linear-gradient(135deg, #4f5bd5, #6a5cff);
  color: #fff;
  text-decoration: none;
  border-radius: 10px;
  font-weight: 600;
}