:root {
  --primary: #0066ff;
  --primary-dark: #004cc9;
  --light: #ffffff;
  --background: #f4f7fa;
  --border: #e0e0e0;
  --text: #333;
  --gray: #777;
  --highlight: #e0f4ff;
  --shadow: rgba(0, 0, 0, 0.08);
  --radius: 12px;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background-color: var(--background);
  color: var(--text);
  margin: 0;
  padding: 0;
}

.container {
  max-width: 720px;
  margin: 4rem auto;
  background-color: var(--light);
  border-radius: var(--radius);
  box-shadow: 0 8px 24px var(--shadow);
  padding: 2.5rem;
  animation: fadeIn 0.6s ease;
}

.container h1 {
  text-align: center;
  color: var(--primary-dark);
  font-size: 2.5rem;
  margin-bottom: 0.5rem;
}

.container .description {
  text-align: center;
  font-size: 1.1rem;
  color: var(--gray);
  margin-bottom: 2rem;
}

.drop-zone {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  text-align: center;
  background-color: #fff;
  transition: background-color 0.3s, border-color 0.3s;
  cursor: pointer;
}

.drop-zone:hover,
.drop-zone.dragover {
  background-color: var(--highlight);
  border-color: var(--primary);
}

.drop-title {
  display: block;
  font-size: 1rem;
  margin-bottom: 1rem;
  color: var(--gray);
}

.upload-button {
  display: inline-block;
  background-color: var(--primary);
  color: white;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius);
  font-size: 1rem;
  font-weight: bold;
  border: none;
  cursor: pointer;
  transition: background-color 0.3s ease;
}

.upload-button:hover {
  background-color: var(--primary-dark);
}

input[type="file"] {
  display: none;
}

label,
input,
button {
  display: block;
  width: 100%;
  margin-top: 1.5rem;
}

label {
  font-weight: 600;
  margin-bottom: 0.5rem;
}

input[type="text"],
input[type="number"] {
  padding: 0.6rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  font-size: 1rem;
  transition: border-color 0.3s ease;
}

input[type="text"]:focus,
input[type="number"]:focus {
  outline: none;
  border-color: var(--primary);
}

input[type="checkbox"] {
  width: auto;
  margin-right: 0.5rem;
}

#submitBtn {
  background-color: var(--primary);
  color: white;
  padding: 0.9rem;
  border: none;
  border-radius: var(--radius);
  font-size: 1.1rem;
  font-weight: bold;
  cursor: pointer;
  margin-top: 2rem;
  transition: background-color 0.3s ease;
}

#submitBtn:hover {
  background-color: var(--primary-dark);
}

#fileDetails,
#progress,
.download-section {
  margin-top: 2rem;
  text-align: center;
}

.hidden {
  display: none;
}

.download-btn {
  display: inline-block;
  background-color: var(--primary);
  color: #fff;
  padding: 0.9rem 2rem;
  font-weight: bold;
  font-size: 1.1rem;
  border-radius: var(--radius);
  text-decoration: none;
  transition: background-color 0.3s ease;
}

.download-btn:hover {
  background-color: var(--primary-dark);
}

/* Thumbnails */
#thumbnails {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 1.5rem;
}

#thumbnails canvas {
  width: 100px;
  height: auto;
  border-radius: var(--radius);
  box-shadow: 0 2px 6px var(--shadow);
}

/* Animation */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Responsive */
@media (max-width: 600px) {
  .container {
    padding: 1.5rem;
  }

  .container h1 {
    font-size: 2rem;
  }

  .upload-button {
    width: 100%;
  }
}


/* Info Section */

.info-section {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 2rem;
  margin: 4rem auto;
  padding: 0 1rem;
  animation: fadeIn 1s ease-in-out;
}

.info-item {
  background: #ffffff;
  color: #333;
  border-radius: 16px;
  padding: 2rem;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.06);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  display: flex;
  flex-direction: column;
  border-top: 4px solid var(--primary);
}

.info-item:hover {
  transform: translateY(-6px);
  box-shadow: 0 10px 28px rgba(0, 123, 255, 0.2);
}

.info-item h2 {
  font-size: 1.8rem;
  color: var(--primary-dark);
  margin-bottom: 1rem;
}

.info-item p {
  font-size: 1.05rem;
  line-height: 1.6;
  margin-bottom: 1rem;
  flex-grow: 1;
}

.info-item ul {
  list-style: none;
  padding-left: 1rem;
}

.info-item ul li {
  margin-bottom: 0.7rem;
  position: relative;
  padding-left: 1.5rem;
}

.info-item ul li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--primary);
  font-weight: bold;
}

body.dark-mode .info-item {
  background: #1c1c1c;
  color: #ccc;
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.5);
}

body.dark-mode .info-item h2 {
  color: var(--primary);
}

body.dark-mode .info-item ul li::before {
  color: var(--accent);
}

/* Animations */

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Responsive */

@media (max-width: 600px) {
  .container {
    padding: 1.5rem;
  }

  .page-title {
    font-size: 2.2rem;
  }

  .info-section {
    grid-template-columns: 1fr;
  }

  .info-item h2 {
    font-size: 1.5rem;
  }

  .info-item p,
  .info-item ul li {
    font-size: 0.95rem;
  }
}