/**
 * Checkbox Component
 * Custom-styled checkbox for consent and agreement forms
 *
 * Features:
 * - Custom checkbox design (replaces browser default)
 * - Checked/unchecked/disabled states
 * - Support for links within label text
 * - Error state styling
 * - Accessible (keyboard navigation, screen readers)
 * - White-label ready via CSS variables
 */

/* ===== CSS VARIABLES ===== */
:root {
  --checkbox-size: 20px;
  --checkbox-border-color: #d1d5db;
  --checkbox-bg: #ffffff;
  --checkbox-checked-bg: #1d1d1b;
  --checkbox-checked-border: #1d1d1b;
  --checkbox-text-color: #374151;
  --checkbox-link-color: #1d1d1b;
  --checkbox-error-color: #dc2626;
  --checkbox-disabled-bg: #f3f4f6;
  --checkbox-disabled-text: #9ca3af;
  --checkbox-focus-ring: rgba(29, 29, 27, 0.2);
}

/* Brand Theme Overrides */
.theme-heiwa {
  --checkbox-checked-bg: var(--heiwa-primary, #00bbb3);
  --checkbox-checked-border: var(--heiwa-primary, #00bbb3);
  --checkbox-link-color: var(--heiwa-primary, #00bbb3);
}

.theme-porsche {
  --checkbox-checked-bg: #1d1d1b;
  --checkbox-link-color: #1d1d1b;
}

.theme-bmw {
  --checkbox-checked-bg: #0066cc;
  --checkbox-link-color: #0066cc;
}

.theme-audi {
  --checkbox-checked-bg: #bb0a30;
  --checkbox-link-color: #bb0a30;
}

/* ===== COMPONENT BASE ===== */
.checkbox-container {
  margin-bottom: 1rem;
}

.checkbox-label {
  display: flex;
  align-items: center;
  cursor: pointer;
  user-select: none;
  position: relative;
  line-height: 1.5;
}

/* ===== HIDDEN NATIVE CHECKBOX ===== */
.checkbox-input {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

/* ===== CUSTOM CHECKBOX ===== */
.checkbox-custom {
  flex-shrink: 0;
  width: var(--checkbox-size);
  height: var(--checkbox-size);
  border: 2px solid var(--checkbox-border-color);
  border-radius: 4px;
  background-color: var(--checkbox-bg);
  margin-right: 0.75rem;
  margin-top: 0;
  position: relative;
  transition: all 0.2s ease;
}

/* Checkmark (hidden by default) */
.checkbox-custom::after {
  content: '';
  position: absolute;
  display: none;
  left: 50%;
  top: 50%;
  width: 5px;
  height: 10px;
  border: solid white;
  border-width: 0 2px 2px 0;
  transform: translate(-50%, -50%) rotate(45deg);
}

/* ===== CHECKED STATE ===== */
.checkbox-input:checked + .checkbox-custom {
  background-color: var(--checkbox-checked-bg);
  border-color: var(--checkbox-checked-border);
}

.checkbox-input:checked + .checkbox-custom::after {
  display: block;
}

/* ===== FOCUS STATE ===== */
.checkbox-input:focus + .checkbox-custom {
  outline: none;
}

/* Keyboard-only focus ring */
.checkbox-input:focus-visible + .checkbox-custom {
  outline: 2px solid var(--brand-primary, #1d1d1b);
  outline-offset: 2px;
}

/* ===== HOVER STATE ===== */
.checkbox-label:hover .checkbox-custom {
  border-color: var(--checkbox-checked-border);
}

.checkbox-input:checked + .checkbox-custom:hover {
  background-color: var(--checkbox-checked-bg);
  opacity: 0.9;
}

/* ===== DISABLED STATE ===== */
.checkbox-input:disabled + .checkbox-custom {
  background-color: var(--checkbox-disabled-bg);
  border-color: var(--checkbox-border-color);
  cursor: not-allowed;
  opacity: 0.6;
}

.checkbox-input:disabled ~ .checkbox-text {
  color: var(--checkbox-disabled-text);
  cursor: not-allowed;
}

.checkbox-label:has(.checkbox-input:disabled) {
  cursor: not-allowed;
}

.checkbox-label:has(.checkbox-input:disabled):hover .checkbox-custom {
  border-color: var(--checkbox-border-color);
}

/* ===== CHECKBOX TEXT ===== */
.checkbox-text {
  font-size: 0.9375rem; /* 15px */
  color: var(--checkbox-text-color);
  flex: 1;
}

.checkbox-text .required-indicator {
  color: var(--checkbox-error-color);
  margin-left: 2px;
}

/* ===== LINKS IN CHECKBOX TEXT ===== */
.checkbox-link {
  color: var(--checkbox-link-color);
  text-decoration: underline;
  font-weight: 500;
  transition: opacity 0.2s ease;
}

.checkbox-link:hover {
  opacity: 0.8;
}

.checkbox-link:focus {
  outline: none;
}

.checkbox-link:focus-visible {
  outline: 2px solid var(--brand-primary, #1d1d1b);
  outline-offset: 2px;
  border-radius: 2px;
}

/* ===== ERROR STATE ===== */
.checkbox-container.error .checkbox-custom {
  border-color: var(--checkbox-error-color);
}

.checkbox-container.error .checkbox-text {
  color: var(--checkbox-error-color);
}

.checkbox-error {
  display: block;
  margin-top: 0.25rem;
  margin-left: calc(var(--checkbox-size) + 0.75rem); /* Align with text */
  font-size: 0.875rem; /* 14px */
  color: var(--checkbox-error-color);
}

/* ===== REQUIRED INDICATOR ===== */
/* Red dot removed for cleaner design */

/* ===== RESPONSIVE DESIGN ===== */

/* Mobile */
@media (max-width: 640px) {
  .checkbox-text {
    font-size: 0.875rem; /* 14px */
  }

  .checkbox-error {
    font-size: 0.8125rem; /* 13px */
  }
}

/* ===== PRINT STYLES ===== */
@media print {
  .checkbox-custom {
    border: 1px solid #000;
  }

  .checkbox-input:checked + .checkbox-custom {
    background-color: #000;
  }

  .checkbox-text {
    color: #000;
  }
}

/* ===== ACCESSIBILITY ===== */
/* High contrast mode support */
@media (prefers-contrast: high) {
  .checkbox-custom {
    border-width: 3px;
  }

  .checkbox-input:focus + .checkbox-custom {
    outline-width: 3px;
  }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
  .checkbox-custom {
    transition: none;
  }

  .checkbox-link {
    transition: none;
  }
}

/* ===== Dark Mode ===== */
html.dark-mode {
  --checkbox-border-color: #2d3640;
  --checkbox-bg: #1a1f26;
  --checkbox-checked-bg: #f5f5f5;
  --checkbox-checked-border: #f5f5f5;
  --checkbox-text-color: #a8b2bd;
  --checkbox-link-color: #60a5fa;
  --checkbox-disabled-bg: #242b33;
  --checkbox-disabled-text: #6b7684;
  --checkbox-focus-ring: rgba(245, 245, 245, 0.3);
}

html.dark-mode .checkbox-input:checked + .checkbox-custom::after {
  border-color: #0f1419;
}