:root {
  /* Typography */
  --form-font-size: inherit;
  --form-font-family: inherit;
  --form-label-size: 0.875rem;
  --form-helper-size: 0.8rem;

  /* Colors */
  --form-text: #171717;
  --form-placeholder: #9ca3af;
  --form-label: #374151;
  --form-border: #d1d5db;
  --form-border-hover: #bfc5cf;
  --form-border-focus: #474747;
  --form-border-error: #ef4444;
  --form-bg: #ffffff;
  --form-bg-disabled: #f3f4f6;
  --form-text-disabled: #9ca3af;
  --form-error: #ef4444;
  --form-success: #22c55e;
  --form-check-accent: #474747;

  /* Layout */
  --form-radius: 8px;
  --form-padding-y: 10px;
  --form-padding-x: 14px;
  --form-gap: 6px;
  --form-field-gap: 1.25rem;
  --form-control-gap: 10px;
  --form-min-height: 44px;

  /* Motion */
  --form-transition:
    border-color 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease,
    color 0.2s ease;

  /* Focus */
  --form-focus-shadow: 0 0 0 3px rgba(71, 71, 71, 0.15);
  --form-error-shadow: 0 0 0 3px rgba(239, 68, 68, 0.15);
}

/* Group */
.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--form-gap);
  margin-bottom: var(--form-field-gap);
}

fieldset {
  border: 0;
  padding: 0;
  margin: 0;
  min-width: 0;
}

/* Labels */
label,
.form-label {
  font-size: var(--form-label-size);
  font-weight: 600;
  color: var(--form-label);
  cursor: pointer;
}

.form-label--required::after {
  content: " *";
  color: var(--form-error);
}

/* Controls */
input[type="text"],
input[type="email"],
input[type="tel"],
input[type="number"],
input[type="password"],
input[type="search"],
input[type="url"],
textarea,
select {
  width: 100%;
  display: block;
  font-family: var(--form-font-family);
  font-size: var(--form-font-size);
  color: var(--form-text);
  background-color: var(--form-bg);
  border: 1.5px solid var(--form-border);
  border-radius: var(--form-radius);
  padding: var(--form-padding-y) var(--form-padding-x);
  min-height: var(--form-min-height);
  transition: var(--form-transition);
  appearance: none;
  -webkit-appearance: none;
  outline: none;
}

input::placeholder,
textarea::placeholder {
  color: var(--form-placeholder);
}

input:hover,
textarea:hover,
select:hover {
  border-color: var(--form-border-hover);
}

textarea {
  resize: vertical;
  min-height: 120px;
  line-height: 1.6;
}

/* Focus */
input:focus-visible,
textarea:focus-visible,
select:focus-visible {
  border-color: var(--form-border-focus);
  box-shadow: var(--form-focus-shadow);
}

/* Error */
input.is-error,
textarea.is-error,
select.is-error {
  border-color: var(--form-border-error);
}

input.is-error:focus-visible,
textarea.is-error:focus-visible,
select.is-error:focus-visible {
  box-shadow: var(--form-error-shadow);
}

.form-error-msg {
  font-size: var(--form-helper-size);
  color: var(--form-error);
  margin-top: 2px;
}

/* Helper / Success */
.form-help {
  font-size: var(--form-helper-size);
  color: var(--form-label);
}

.form-success-msg {
  font-size: var(--form-helper-size);
  color: var(--form-success);
  margin-top: 2px;
}

/* Disabled */
input:disabled,
textarea:disabled,
select:disabled {
  background-color: var(--form-bg-disabled);
  color: var(--form-text-disabled);
  cursor: not-allowed;
  opacity: 1;
}

/* Select */
select {
  cursor: pointer;
  padding-right: 40px;
  background-repeat: no-repeat;
  background-position: right 14px center;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23474747' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
}

/* Checkbox / Radio */
.form-check {
  display: flex;
  align-items: center;
  gap: var(--form-control-gap);
  cursor: pointer;
}

.form-check input[type="checkbox"],
.form-check input[type="radio"] {
  width: 18px;
  height: 18px;
  min-width: 18px;
  border: 1.5px solid var(--form-border);
  background-color: var(--form-bg);
  cursor: pointer;
  padding: 0;
  transition: var(--form-transition);
  appearance: none;
  -webkit-appearance: none;
}

.form-check input[type="checkbox"] {
  border-radius: 4px;
}

.form-check input[type="radio"] {
  border-radius: 50%;
}

.form-check input[type="checkbox"]:checked,
.form-check input[type="radio"]:checked {
  background-color: var(--form-check-accent);
  border-color: var(--form-check-accent);
}

.form-check input[type="checkbox"]:checked {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='3'%3E%3Cpath d='M20 6L9 17l-5-5'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: center;
}

.form-check input[type="radio"]:checked {
  box-shadow: inset 0 0 0 4px white;
}

.form-check input:focus-visible {
  box-shadow: var(--form-focus-shadow);
}

.form-check-label {
  font-size: 0.9rem;
  color: var(--form-text);
  user-select: none;
}

/* Touch */
@media (hover: none) {
  input:hover,
  textarea:hover,
  select:hover {
    border-color: var(--form-border);
  }
}