*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  background: radial-gradient(circle at center, var(--about-background-color-start), var(--about-background-color-end));
  color: var(--text-color);
  overflow-x: hidden;
  overflow-y: auto;
}

.form-container {
  background: var(--input-background-color);
  border-radius: var(--border-radius);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
  padding: 30px;
  width: 92%;
  max-width: 900px;
  margin: 20px;
  animation: fadeIn 0.5s ease-in-out;
  z-index: 1;
}

h1 {
  font-size: clamp(22px, 4.5vw, 32px);
  margin: 0 0 22px 0;
  color: var(--text-color);
  text-align: center;
  font-weight: bold;
}

.contact-form {
  display: flex;
  flex-direction: column;
}

.contact-form label {
  font-weight: bold;
  margin: 0 0 8px 0;
  display: block;
  color: var(--text-color);
  width: 100%;
}

.contact-form input[type="text"],
.contact-form input[type="email"],
.contact-form input[type="file"],
.contact-form textarea {
  width: 100%;
  padding: 14px;
  margin: 0 0 18px 0;
  border-radius: var(--border-radius);
  font-size: clamp(14px, 2.5vw, 16px);
  background: var(--input-background-color);
  color: var(--text-color);
  box-shadow: 0 4px 10px var(--shadow-color);
  border: none;
}

.contact-form textarea {
  resize: none;
  min-height: 170px;
  font-family: Arial, sans-serif;
}

.contact-form textarea:focus,
.contact-form input:focus {
  box-shadow: inset 5px 5px 10px #dfe3ea, inset -5px -5px 10px #faffff;
  outline: none;
}

.upload-hint {
  font-size: clamp(11px, 2vw, 13px);
  margin: 0 0 10px 0;
  opacity: 0.9;
}

.file-inputs input[type="file"] {
  margin-bottom: 12px;
}

.file-actions {
  display: flex;
  gap: 10px;
  margin: 0 0 18px 0;
  flex-wrap: wrap;
}

.file-actions button {
  background-color: var(--button-background-color);
  color: var(--button-text-color);
  font-size: 14px;
  padding: 10px 14px;
  border: none;
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: background-color 0.3s ease;
  box-shadow: 0 4px 10px var(--shadow-color);
  width: fit-content;
  max-width: 100%;
}

.file-actions button:hover {
  background-color: var(--button-background-color-hover);
  color: var(--button-text-color-hover);
  box-shadow: inset 5px 5px 10px #dfe3ea, inset -5px -5px 10px #faffff;
}

.tile-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 12px;
  margin: 0 auto 18px auto;
  max-width: 680px;
  width: 100%;
}

.tile-grid input[type="radio"] {
  display: none;
}

.tile {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 12px 14px;
  border-radius: var(--border-radius);
  background: var(--input-background-color);
  box-shadow: 0 4px 10px var(--shadow-color);
  cursor: pointer;
  user-select: none;
  font-weight: bold;
  transition: transform 0.06s ease, box-shadow 0.3s ease;
  text-align: center;
  min-height: 48px;
}

.tile:hover {
  transform: translateY(-1px);
}

.tile-grid input[type="radio"]:checked + .tile {
  box-shadow: inset 5px 5px 10px #dfe3ea, inset -5px -5px 10px #faffff;
  outline: 2px solid var(--link-color);
}

.tile-grid input[type="radio"][disabled] + .tile {
  opacity: 0.35;
  cursor: not-allowed;
  filter: grayscale(1);
  pointer-events: none;
}

.hint {
  font-size: 12px;
  opacity: 0.85;
  margin: 0 0 18px 0;
}

.agreement {
  margin: 0 0 10px 0;
}

.agreement-line {
  font-weight: normal;
  font-size: clamp(10px, 2vw, 12px);
  display: flex;
  gap: 8px;
  align-items: center;
  flex-wrap: wrap;
  line-height: 1.35;
}

.agreement-line input[type="checkbox"] {
  width: 16px;
  height: 16px;
  margin: 0;
}

.agreement a {
  font-weight: bold;
  color: var(--link-color);
  text-decoration: none;
}

.agreement a:hover {
  text-decoration: underline;
}

.submit-button {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 6px;
}

.submit-button button {
  background-color: var(--button-background-color);
  color: var(--button-text-color);
  font-size: 16px;
  padding: 12px 20px;
  border: none;
  width: 100%;
  display: flex;
  justify-content: center;
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: background-color 0.3s ease;
  box-shadow: 0 4px 10px var(--shadow-color);
}

.submit-button button:hover {
  background-color: var(--button-background-color-hover);
  color: var(--button-text-color-hover);
  box-shadow: inset 5px 5px 10px #dfe3ea, inset -5px -5px 10px #faffff;
}

.particle-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  overflow: hidden;
  z-index: 0;
}

.particle {
  position: absolute;
  border-radius: 50%;
  background-color: rgba(255, 255, 255, 0.3);
  animation: particle-animation 5s infinite ease-in-out;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 768px) {
  body {
    overflow: auto;
  }

  .form-container {
    padding: 18px;
    margin: 14px;
    width: 94%;
  }

  .tile-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    max-width: 100%;
    gap: 10px;
  }

  .tile {
    padding: 12px;
    min-height: 46px;
  }

  .contact-form textarea {
    min-height: 150px;
  }
}

@media (max-width: 480px) {
  .form-container {
    padding: 16px;
    margin: 10px;
    width: 96%;
  }

  h1 {
    margin-bottom: 18px;
  }

  .contact-form input[type="text"],
  .contact-form input[type="email"],
  .contact-form input[type="file"],
  .contact-form textarea {
    padding: 12px;
    margin-bottom: 16px;
  }

  .tile-grid {
    grid-template-columns: 1fr;
    gap: 10px;
  }

  .file-actions {
    gap: 8px;
  }

  .file-actions button {
    width: 100%;
  }

  .submit-button button {
    padding: 12px 16px;
  }
}