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

/* VARIABLES */
:root {
  /* --accent-color: #2a2f38; */
  --accent-color: #abb1bc;
  --focus-color: #4c8bf5;
  --card-bkgnd: #23262c;
  --invalid-background: #2a1414;
}

body {
  margin: 0;
  font-family:
    system-ui,
    -apple-system,
    sans-serif;
  background: #0f1115;
  color: #e6e6e6;
  line-height: 1.5;
}

header {
  position: sticky;
  top: 0;

  width: 100%;
  height: 120px;

  display: flex;
  align-items: center;
  justify-content: center;

  background-image: url("banner2.png");
  background-size: cover;
  background-position: center;

  border-bottom: 2px solid var(--accent-color);

  h1 {
    margin: 0;
    font-size: 32px;
    text-align: center;
  }

  h2 {
    font-size: 13px;
    color: #ddd;
    text-align: center;
  }
}

/* CARD & FORM */
.card {
  max-width: 800px;
  margin: 40px auto;
  padding: 20px;

  background: var(--card-bkgnd);
  border-radius: 12px;
  padding: 24px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
}

form {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.entry-group,
.confirmation,
.rdr-mitglied {
  border: 2px solid var(--accent-color);
  border-radius: 5px;
  padding: 0px 10px 10px 10px;
  /*background: blue;*/
}

.entry {
  display: flex;
  flex-direction: column;
  margin: 15px 0px 0px 0px;
}

.confirmation input[type="checkbox"],
.rdr-mitglied input[type="checkbox"] {
  display: inline-block;
  float: none;
  margin-right: 0.5em;
  margin-top: 1em;
  width: auto;
}

.confirmation label,
.rdr-mitglied label {
  display: inline;
}

/* ELEMENTS */
h1 {
  font-size: 2rem;
  margin: 0 0 10px 0;
  font-weight: 600;
  color: #ffffff;
}

h2 {
  font-size: 1.2rem;
  margin: 0;
  font-weight: 400;
  color: #ffffff;
}

p {
  font-size: 0.75rem;
  margin: 0 0 0px 0;
}

input,
select,
textarea {
  width: 100%;
  padding: 10px 12px;
  margin-bottom: 4px;
  border-radius: 8px;
  border: 1px solid var(--accent-color);
  background: #12151b;
  color: #e6e6e6;
  font-size: 0.8rem;
  transition:
    border-color 0.2s,
    background 0.2s;
}

label {
  font-size: 0.75rem;
  color: #aaa;
  margin-bottom: 4px;
  display: block;
}

button {
  padding: 12px;
  border-radius: 10px;
  border: none;
  background: var(--focus-color);
  color: white;
  font-weight: 600;
  cursor: pointer;
  transition:
    background 0.2s,
    transform 0.05s;
}

.response {
  h1 {
    font-size: 2.6rem;
    text-align: center;
  }
  p {
    font-size: 1.6rem;
    margin: 0px;
    text-align: center;
  }
  a {
    display: block;
    text-align: center;
    margin: 20px;
    padding: 12px;
    border-radius: 10px;
    border: none;
    background: var(--focus-color);
    color: white;
    font-weight: 600;
    cursor: pointer;
  }
}

/* FOKUS and HOVER */
input:focus,
select:focus,
textarea:focus,
.entry-group:focus-within,
.confirmation:focus-within,
.rdr-mitglied:focus-within {
  outline: none;
  border-color: var(--focus-color);
  background: #141922;
}

button:hover {
  background: #3a6fd8;
}

button:active {
  transform: scale(0.98);
}

input:invalid,
select:invalid,
textarea:invalid,
.confirmation:has(input:invalid),
.rdr-mitglied:has(input:invalid) {
  /*border-color: red;*/
  background: var(--invalid-background);
}

/* MEDIA QUERIES */
@media (max-width: 600px) {
  .card {
    margin: 20px;
    padding: 0;

    padding: 16px;
  }
}