/* Base styles and CSS variables */
:root {
  --color-bg: #fff;
  --color-text: #000;
  --color-input-bg: #fafafa;
  --color-input-border: #e0e0e0;
  --color-input-border-focus: #000;
  --color-button-hover: #44AA44;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #181818;
    --color-text: #fff;
    --color-input-bg: #222222;
    --color-input-border: #666666;
    --color-input-border-focus: #fff;
    --color-button-hover: #44AA44;
  }
}

/* Reset styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-size: 14px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
  color: var(--color-text);
}

/* Layout */
body {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  background-color: var(--color-bg);
  margin-bottom: 20px;
}

/* Header styles */
.header {
  font-size: 34px;
  margin-top: 10vh;
  margin-bottom: 10px;
  text-align: center;
}

.text {
  max-width: 300px;
  margin-bottom: 20px;
  text-align: center;
}

/* Form styles */
.inputBox {
  position: relative;
  width: 300px;
  margin-bottom: 20px;
}

.inputBox textarea {
  margin-bottom: -4px;
}

.inputBox input,
.inputBox textarea {
  width: 100%;
  padding: 10px;
  border: 1px solid var(--color-input-border);
  background: var(--color-input-bg);
  outline: none;
  resize: none;
}

.inputBox span {
  position: absolute;
  left: 0;
  padding: 10px;
  pointer-events: none;
  transition: 0.25s;
}

/* Input focus and valid states */
.inputBox input:valid ~ span,
.inputBox input:focus ~ span,
.inputBox textarea:valid ~ span,
.inputBox textarea:focus ~ span {
  color: var(--color-text);
  transform: translateX(10px) translateY(-7px);
  font-size: 12px;
  padding: 0 10px;
  background: linear-gradient(to bottom, var(--color-bg) 56%, var(--color-input-bg) 44%);
}

.inputBox input:focus,
.inputBox textarea:focus {
  border-color: var(--color-input-border-focus);
}

/* Button styles */
button[type="submit"] {
  text-decoration: none;
  appearance: none;
  -webkit-appearance: none;
  background: none;
  width: 300px;
  padding: 10px 30px;
  margin: 14px 0 20px;
  position: relative;
  text-align: center;
  display: block;
  border: 1px solid var(--color-input-border);
  background: var(--color-input-bg);
  transition: 0.5s;
}

button[type="submit"]::before {
  content: '';
  position: absolute;
  inset: 2px;
  background: var(--color-input-bg);
}

button[type="submit"]:hover {
  background: var(--color-button-hover);
  box-shadow: 0 0 25px var(--color-button-hover);
}

button[type="submit"] span {
  position: relative;
  z-index: 1;
}

/* Accessibility - visually hidden labels */
label[for="name"],
label[for="email"],
label[for="message"] {
  position: absolute;
  left: -9999px;
  top: auto;
  width: 1px;
  height: 1px;
  overflow: hidden;
}