/* Original card styles (keep these) */
* {
  box-sizing: border-box;
  margin: 0;
  font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
}

body {
  background: linear-gradient(145deg, #f8faff 0%, #eef2f9 100%);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  margin: 0;
  padding: 16px;
  flex-direction: column;
}

.card {
  max-width: 820px;
  width: 100%;
  background: rgba(255,255,255,0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-radius: 42px;
  box-shadow: 0 25px 50px -8px rgba(0,10,40,0.25), inset 0 0 0 1px rgba(255,255,255,0.6);
  padding: 2rem 2rem 2.5rem;
  transition: all 0.2s ease;
}

h1 {
  font-size: 2rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  display: flex;
  align-items: center;
  gap: 10px;
  color: #13294b;
  margin: 0 0 0.1rem 0;
  flex-wrap: wrap;
}

.sub {
  color: #2c3e6d;
  font-size: 1rem;
  font-weight: 400;
  margin-bottom: 2rem;
  border-left: 4px solid #5b8cff;
  padding-left: 1rem;
  background: rgba(91, 140, 255, 0.06);
  border-radius: 0 20px 20px 0;
}

.badge-container {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 28px;
}

.badge {
  background: white;
  border-radius: 60px;
  padding: 0.6rem 1.3rem;
  font-weight: 500;
  font-size: 0.9rem;
  box-shadow: 0 6px 14px rgba(0,20,50,0.08);
  border: 1px solid rgba(255,255,255,0.7);
  color: #1e2f4b;
}

.badge span {
  font-weight: 700;
  color: #2d5bee;
  margin-right: 4px;
}

.drop-area {
  background: rgba(255, 255, 255, 0.5);
  border: 2px dashed #a5bbff;
  border-radius: 36px;
  padding: 2.8rem 1.5rem;
  text-align: center;
  cursor: pointer;
  transition: background 0.2s, border-color 0.2s, transform 0.1s;
  margin-bottom: 28px;
  backdrop-filter: blur(4px);
}

.drop-area:hover {
  background: rgba(255, 255, 255, 0.8);
  border-color: #3f6aff;
}

.drop-area:active {
  transform: scale(0.99);
}

.drop-area svg {
  width: 56px;
  height: 56px;
  stroke: #2f54b0;
  stroke-width: 1.5;
  fill: none;
  margin-bottom: 12px;
  opacity: 0.8;
}

.drop-text {
  font-size: 1.25rem;
  font-weight: 500;
  color: #121f3f;
}

.small-hint {
  font-size: 0.9rem;
  color: #4a5b7c;
  margin-top: 8px;
}

.file-input {
  display: none;
}

#previewPanel {
  display: none;
}

.preview-panel {
  background: rgba(255,255,255,0.5);
  border-radius: 32px;
  padding: 1.75rem 1.5rem;
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255,255,255,0.8);
  box-shadow: 0 8px 18px -6px rgba(0,0,0,0.1);
  margin-bottom: 24px;
}

.preview-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 18px;
}

.preview-header h3 {
  font-weight: 600;
  color: #13294b;
  font-size: 1.3rem;
  margin: 0;
}

.file-name {
  background: white;
  border-radius: 40px;
  padding: 0.4rem 1.2rem;
  font-size: 0.85rem;
  font-weight: 500;
  color: #1f3a78;
  max-width: 260px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  border: 1px solid #e3eaff;
}

/* Responsive image comparison */
.img-comparison {
  display: flex;
  flex-direction: row;
  align-items: center;
  justify-content: center;
  gap: 20px;
  transition: all 0.3s ease;
}

.preview-box {
  flex: 1 1 200px;
  text-align: center;
  background: white;
  border-radius: 28px;
  padding: 20px 15px;
  box-shadow: 0 12px 24px -12px rgba(18, 52, 77, 0.15);
  min-width: 0;
}

.preview-box p {
  margin: 0 0 10px 0;
  font-weight: 600;
  color: #2f4096;
  font-size: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
}

.preview-box img {
  max-width: 100%;
  max-height: 160px;
  border-radius: 18px;
  background: #f0f4ff;
  box-shadow: 0 4px 8px rgba(0,0,0,0.02);
  object-fit: contain;
}

.arrow-container {
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.3s ease;
}

.arrow {
  font-size: 2.5rem;
  color: #5572d4;
  font-weight: 300;
  line-height: 1;
}

/* Responsive breakpoint - stack vertically on narrow screens */
@media (max-width: 580px) {
  .img-comparison {
    flex-direction: column;
  }
  .arrow-container {
    transform: rotate(90deg);
  }
  .preview-box {
    width: 100%;
  }
}

.format-info {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 15px;
  background: #eef3fe;
  padding: 12px 20px;
  border-radius: 80px;
  width: fit-content;
  margin: 16px auto 0;
  flex-wrap: wrap;
}

.smart-badge {
  background: #2d5bee;
  color: white;
  padding: 4px 14px;
  border-radius: 40px;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.3px;
}

.format-selector {
  display: flex;
  align-items: center;
  gap: 10px;
}

.format-selector label {
  font-weight: 500;
  color: #1d2f5a;
}

#targetFormat {
  background: white;
  border: none;
  padding: 8px 20px 8px 16px;
  border-radius: 40px;
  font-weight: 500;
  color: #0031b3;
  outline: 1px solid #cddcff;
  font-size: 0.95rem;
  cursor: pointer;
}

.action-bar {
  display: flex;
  justify-content: center;
  margin-top: 24px;
}

.convert-btn {
  background: #1d2b5f;
  border: none;
  color: white;
  font-size: 1.3rem;
  font-weight: 500;
  padding: 1rem 3rem;
  border-radius: 50px;
  display: inline-flex;
  align-items: center;
  gap: 14px;
  box-shadow: 0 18px 28px -12px #142b70;
  cursor: pointer;
  transition: all 0.15s;
  border: 1px solid rgba(255,255,255,0.3);
  letter-spacing: 0.3px;
}

.convert-btn:not(:disabled):hover {
  background: #253b7a;
  transform: scale(1.02);
  box-shadow: 0 22px 32px -12px #0f2460;
}

.convert-btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
  box-shadow: none;
}

.reset-link {
  text-align: center;
  margin-top: 24px;
}

.reset-btn {
  background: transparent;
  border: 1px solid #b7c6ec;
  border-radius: 40px;
  padding: 0.5rem 1.8rem;
  color: #1f3c7a;
  font-weight: 500;
  font-size: 0.9rem;
  cursor: pointer;
  transition: all 0.1s;
}

.reset-btn:hover {
  background: white;
  border-color: #3e63dd;
}

.footnote {
  text-align: center;
  color: #596f9f;
  font-size: 0.85rem;
  margin-top: 22px;
}

/* ===== NEW SEO CONTENT STYLES ===== */
.seo-content {
  max-width: 820px;
  width: 100%;
  margin: 2rem auto 0;
}

.explanation-block,
.how-it-works,
.use-cases,
.faq-mini,
.more-tools {
  background: rgba(255, 255, 255, 0.5);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-radius: 32px;
  padding: 1.5rem 2rem;
  margin-bottom: 1.5rem;
  border: 1px solid rgba(255, 255, 255, 0.8);
  box-shadow: 0 8px 18px -6px rgba(0, 0, 0, 0.1);
}

.seo-content h2 {
  color: #13294b;
  font-size: 1.5rem;
  font-weight: 600;
  margin: 0 0 1rem 0;
  letter-spacing: -0.02em;
}

.explanation-block p {
  color: #2c3e6d;
  font-size: 1.05rem;
  line-height: 1.6;
  margin: 0;
}

/* Feature Grid */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.5rem;
}

.feature-item {
  display: flex;
  align-items: flex-start;
  gap: 0.8rem;
}

.feature-icon {
  font-size: 1.8rem;
  line-height: 1;
  min-width: 2.2rem;
  text-align: center;
}

.feature-item p {
  color: #2c3e6d;
  font-size: 0.95rem;
  line-height: 1.5;
  margin: 0;
}

.feature-item strong {
  color: #1d2b5f;
  display: block;
  margin-bottom: 0.2rem;
}

/* Use Cases Grid */
.cases-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.5rem;
}

.case-item {
  display: flex;
  align-items: flex-start;
  gap: 0.8rem;
}

.case-icon {
  font-size: 1.8rem;
  min-width: 2.2rem;
  text-align: center;
}

.case-item p {
  color: #2c3e6d;
  font-size: 0.95rem;
  line-height: 1.5;
  margin: 0;
}

.case-item strong {
  color: #1d2b5f;
  display: block;
  margin-bottom: 0.2rem;
}

/* FAQ Mini */
.faq-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.5rem;
}

.faq-item {
  background: rgba(255, 255, 255, 0.7);
  border-radius: 20px;
  padding: 1.2rem;
}

.faq-q {
  margin: 0 0 0.5rem 0;
  color: #1d2b5f;
  font-size: 1rem;
}

.faq-a {
  margin: 0;
  color: #2c3e6d;
  font-size: 0.9rem;
  line-height: 1.5;
}

/* More Tools Section */
.more-tools ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: center;
}

.more-tools li {
  margin: 0;
}

.more-tools a {
  display: inline-block;
  background: white;
  color: #1d2b5f;
  text-decoration: none;
  padding: 0.8rem 1.5rem;
  border-radius: 40px;
  font-weight: 500;
  font-size: 1rem;
  border: 1px solid #cddcff;
  transition: all 0.2s ease;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.02);
}

.more-tools a:hover {
  background: #2d5bee;
  color: white;
  border-color: #2d5bee;
  transform: translateY(-2px);
  box-shadow: 0 8px 16px -8px #2d5bee;
}

/* Authority Line */
.authority-line {
  text-align: center;
  padding: 1rem 0 2rem;
  color: #596f9f;
  font-size: 0.95rem;
  font-style: italic;
  border-top: 1px solid rgba(89, 111, 159, 0.2);
  margin-top: 0.5rem;
}

.brand-highlight {
  color: #2d5bee;
  font-weight: 600;
  font-style: normal;
}

/* Responsive adjustments */
@media (max-width: 640px) {
  .explanation-block,
  .how-it-works,
  .use-cases,
  .faq-mini,
  .more-tools {
    padding: 1.2rem 1.2rem;
  }
  
  .feature-grid,
  .cases-grid,
  .faq-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
  
  .more-tools ul {
    flex-direction: column;
    align-items: center;
  }
  
  .more-tools a {
    width: 100%;
    text-align: center;
  }
  
  .seo-content h2 {
    font-size: 1.3rem;
  }
}