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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: #f5f5f5;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.container {
  background: #fff;
  border-radius: 12px;
  padding: 40px;
  width: 100%;
  max-width: 560px;
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.08);
}

h1 {
  font-size: 24px;
  font-weight: 700;
  color: #111;
}

.subtitle {
  margin-top: 6px;
  color: #666;
  font-size: 14px;
}

form {
  margin-top: 32px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

label {
  font-size: 13px;
  font-weight: 600;
  color: #333;
}

input[type="email"],
input[type="text"] {
  border: 1px solid #ddd;
  border-radius: 8px;
  padding: 10px 14px;
  font-size: 14px;
  color: #111;
  outline: none;
  transition: border-color 0.2s;
}

input[type="email"]:focus,
input[type="text"]:focus {
  border-color: #6366f1;
}

.file-drop {
  border: 2px dashed #ddd;
  border-radius: 8px;
  padding: 24px;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
  position: relative;
}

.file-drop:hover,
.file-drop.dragover {
  border-color: #6366f1;
  background: #f5f3ff;
}

.file-drop input[type="file"] {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
  width: 100%;
  height: 100%;
}

#fileLabel {
  font-size: 13px;
  color: #888;
  pointer-events: none;
}

.preview {
  border: 1px solid #eee;
  border-radius: 8px;
  overflow: hidden;
}

.preview-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 14px;
  background: #f9f9f9;
  border-bottom: 1px solid #eee;
  font-size: 12px;
  font-weight: 600;
  color: #666;
}

.preview-header button {
  background: none;
  border: none;
  cursor: pointer;
  color: #999;
  font-size: 14px;
  line-height: 1;
}

.preview-header button:hover {
  color: #333;
}

iframe {
  width: 100%;
  height: 300px;
  border: none;
  display: block;
}

button[type="submit"] {
  background: #6366f1;
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 12px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s, opacity 0.2s;
}

button[type="submit"]:hover {
  background: #4f46e5;
}

button[type="submit"]:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.hidden {
  display: none !important;
}

.toast {
  margin-top: 16px;
  padding: 12px 16px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 500;
  text-align: center;
}

.toast.success {
  background: #ecfdf5;
  color: #065f46;
  border: 1px solid #6ee7b7;
}

.toast.error {
  background: #fef2f2;
  color: #991b1b;
  border: 1px solid #fca5a5;
}