:root {
  color-scheme: light;
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background-color: #f5f7fa;
  color: #1f2933;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background-color: #f5f7fa;
  display: flex;
  flex-direction: column;
}

.top-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 48px;
  background-color: #ffffff;
  border-bottom: 1px solid #e5e7eb;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-dot {
  width: 14px;
  height: 14px;
  border-radius: 7px;
  background: #669bbb;
}

.brand-name {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: #1f2933;
}

.actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.action-link {
  color: #475467;
  text-decoration: none;
  font-size: 14px;
  font-weight: 600;
  transition: color 0.2s ease;
}

.action-link:hover {
  color: #1f2933;
}

.primary-button,
.secondary-button {
  border: none;
  border-radius: 10px;
  padding: 12px 18px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.primary-button {
  background-color: #669bbb;
  color: #ffffff;
}

.primary-button:hover {
  background-color: #5688a5;
}

.secondary-button {
  background-color: #e4ebf4;
  color: #1f2933;
}

.secondary-button:hover {
  background-color: #d4deea;
}

.layout {
  flex: 1;
  display: grid;
  grid-template-columns: minmax(0, 2fr) minmax(280px, 1fr);
  gap: 32px;
  padding: 40px 48px;
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
}

.upload-card,
.preview-card {
  background-color: #ffffff;
  border-radius: 18px;
  padding: 32px;
  box-shadow: 0 8px 18px rgba(31, 41, 51, 0.08);
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.card-header h1 {
  margin: 0;
  font-size: 28px;
  color: #1f2933;
}

.card-header p {
  margin: 8px 0 0;
  color: #475467;
  font-size: 15px;
}

.upload-form {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.form-field {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.field-label {
  font-weight: 600;
  font-size: 14px;
  color: #1f2933;
}

.form-field input,
.form-field textarea {
  border: 1px solid #d0d5dd;
  border-radius: 12px;
  padding: 14px 16px;
  font-size: 15px;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
  font-family: inherit;
  resize: vertical;
  background-color: #ffffff;
  color: #1f2933;
}

.form-field input:focus,
.form-field textarea:focus {
  outline: none;
  border-color: #669bbb;
  box-shadow: 0 0 0 3px rgba(102, 155, 187, 0.2);
}

.upload-field {
  border: 2px dashed #cbd5e1;
  border-radius: 16px;
  padding: 28px;
  background-color: #f5f7fa;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  cursor: pointer;
  transition: border-color 0.2s ease, background-color 0.2s ease;
  text-align: center;
  color: #475467;
}

.upload-field:hover {
  border-color: #669bbb;
  background-color: #eef3f8;
}

.upload-icon {
  font-size: 32px;
}

.upload-copy span {
  display: block;
  font-size: 13px;
  color: #667085;
}

.upload-field input {
  display: none;
}

.form-footer {
  display: flex;
  gap: 16px;
  justify-content: flex-end;
}

.preview-card h2 {
  margin: 0;
  font-size: 22px;
  color: #1f2933;
}

.preview-card p {
  margin: 0;
  color: #475467;
  font-size: 14px;
  line-height: 1.6;
}

.placeholder-preview {
  height: 220px;
  border-radius: 16px;
  background-color: #f5f7fa;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px dashed #cbd5e1;
  color: #475467;
  font-weight: 600;
  letter-spacing: 0.04em;
}

.tips {
  background-color: #f8fafc;
  border-radius: 14px;
  padding: 16px;
  border: 1px solid #e5e7eb;
}

.tips h3 {
  margin: 0 0 8px;
  font-size: 16px;
  color: #1f2933;
}

.tips ul {
  margin: 0;
  padding-left: 20px;
  color: #475467;
  font-size: 13px;
  line-height: 1.6;
}

.footer {
  padding: 20px 48px 32px;
  text-align: center;
  color: #667085;
  font-size: 13px;
}

@media (max-width: 960px) {
  .layout {
    grid-template-columns: 1fr;
    padding: 32px 24px;
  }

  .form-footer {
    flex-direction: column-reverse;
    align-items: stretch;
  }

  .top-bar {
    flex-direction: column;
    gap: 16px;
    align-items: flex-start;
    padding: 20px 24px;
  }

  .actions {
    flex-wrap: wrap;
    justify-content: flex-start;
  }
}

@media (max-width: 600px) {
  .top-bar,
  .layout,
  .footer {
    padding-left: 16px;
    padding-right: 16px;
  }

  .upload-card,
  .preview-card {
    padding: 24px;
  }

  .card-header h1 {
    font-size: 24px;
  }
}