:root {
  --bg-color: #f8f9fa;
  --container-bg: #ffffff;
  --text-color: #212529;
  --accent-color: #007bff;
  --btn-bg: #007bff;
  --btn-hover: #0056b3;
  --shadow: rgba(0, 0, 0, 0.1);
  --result-bg: #e9ecef;
}

[data-theme="dark"] {
  --bg-color: #121212;
  --container-bg: #1e1e1e;
  --text-color: #e0e0e0;
  --accent-color: #3700b3;
  --btn-bg: #bb86fc;
  --btn-hover: #9965f4;
  --shadow: rgba(0, 0, 0, 0.5);
  --result-bg: #333333;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  display: flex;
  flex-direction: column;
  align-items: center;
  min-height: 100vh;
  background-color: var(--bg-color);
  color: var(--text-color);
  transition: background-color 0.3s, color 0.3s;
  margin: 0;
  padding: 2rem 1rem;
  gap: 2rem;
}

.test-container, .contact-form {
  width: 100%;
  max-width: 500px;
  background-color: var(--container-bg);
  padding: 2rem;
  border-radius: 15px;
  box-shadow: 0 10px 25px var(--shadow);
  text-align: center;
  position: relative;
  transition: background-color 0.3s;
}

.description {
  margin-bottom: 2rem;
  opacity: 0.8;
}

.upload-section {
  margin-bottom: 2rem;
}

.preview-box {
  margin-top: 1.5rem;
  display: flex;
  justify-content: center;
  border: 2px dashed var(--result-bg);
  border-radius: 10px;
  min-height: 200px;
  align-items: center;
  overflow: hidden;
}

.preview-box img {
  max-width: 100%;
  max-height: 400px;
  border-radius: 8px;
  object-fit: contain;
}

.result-box {
  margin-bottom: 2rem;
}

.result-box div {
  background-color: var(--result-bg);
  padding: 12px;
  margin: 8px 0;
  border-radius: 8px;
  font-weight: bold;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.main-btn, .submit-btn {
  width: 100%;
  padding: 1rem;
  font-size: 1.1rem;
  border: none;
  background-color: var(--btn-bg);
  color: white;
  border-radius: 8px;
  cursor: pointer;
  transition: background-color 0.2s, transform 0.1s;
  font-weight: bold;
}

.main-btn:active, .submit-btn:active {
  transform: scale(0.98);
}

.main-btn:hover, .submit-btn:hover {
  background-color: var(--btn-hover);
}

#loading-spinner {
  font-weight: bold;
  color: var(--accent-color);
}

/* Form Styles */
.contact-form h2 { margin-top: 0; margin-bottom: 1.5rem; }
.form-group { text-align: left; margin-bottom: 1rem; }
.form-group label { display: block; margin-bottom: 0.5rem; font-weight: bold; }
.form-group input, .form-group textarea {
  width: 100%; padding: 0.8rem; border: 1px solid var(--result-bg);
  border-radius: 5px; background-color: var(--bg-color); color: var(--text-color);
  box-sizing: border-box; font-family: inherit;
}
.form-group textarea { height: 80px; resize: vertical; }

.theme-toggle {
  position: absolute; top: 15px; right: 15px; cursor: pointer;
  background: none; border: none; font-size: 1.5rem; padding: 5px;
  border-radius: 50%; display: flex; align-items: center; justify-content: center;
}