/**
 * AlgoLab – Accessibility Settings (v3.1.0)
 * Shared accessibility module for all pages
 * Supports: dyslexia font, reduced motion, high contrast, font size scaling
 */

@import url('https://fonts.googleapis.com/css2?family=OpenDyslexic:wght@400;700&display=swap');

/* ────────────────────────────────────────────────────────── */
/* Modal Structure */
/* ────────────────────────────────────────────────────────── */

.modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

.modal.hidden {
  display: none;
}

.modal-box {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 16px;
}

.modal-header h3 {
  margin: 0;
  font-size: 18px;
  font-weight: 600;
  color: var(--text);
}

.modal-close-btn {
  background: none;
  border: none;
  font-size: 24px;
  cursor: pointer;
  color: var(--text-muted);
  padding: 8px 12px;
  border-radius: var(--radius);
  transition: all 0.15s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 40px;
  min-height: 40px;
  flex-shrink: 0;
}

.modal-close-btn:hover {
  color: var(--text);
  background: var(--bg3);
}

.modal-close-btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.modal-actions {
  display: flex;
  gap: 8px;
  justify-content: flex-end;
  padding-top: 16px;
  border-top: 1px solid var(--border);
  margin-top: 16px;
}

/* ────────────────────────────────────────────────────────── */
/* Accessibility Settings Modal */
/* ────────────────────────────────────────────────────────── */

.modal-accessibility-box {
  width: 100%;
  max-width: 500px;
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  color: var(--text);
}

.accessibility-settings {
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin: 20px 0;
}

.accessibility-setting {
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg);
  transition: all 0.2s ease;
}

.accessibility-setting:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(124, 106, 240, 0.1);
}

.a11y-label {
  display: flex;
  flex-direction: column;
  gap: 8px;
  cursor: pointer;
  user-select: none;
}

.a11y-label input[type="checkbox"] {
  width: 20px;
  height: 20px;
  cursor: pointer;
  accent-color: var(--accent);
  margin-bottom: 4px;
}

.a11y-label input[type="range"] {
  width: 100%;
  height: 6px;
  cursor: pointer;
  accent-color: var(--accent);
  margin-top: 8px;
}

.a11y-label span:first-of-type {
  font-weight: 600;
  color: var(--text);
  font-size: 15px;
}

.a11y-desc {
  font-size: 12px;
  color: var(--text-muted);
  font-style: italic;
}

/* ────────────────────────────────────────────────────────── */
/* Dyslexia Font Support */
/* ────────────────────────────────────────────────────────── */

[data-accessibility*="dyslexia-font"],
[data-accessibility*="dyslexia-font"] * {
  font-family: 'OpenDyslexic', 'Segoe UI', system-ui, sans-serif !important;
  letter-spacing: 0.05em;
  line-height: 1.6;
}

[data-accessibility*="dyslexia-font"] code,
[data-accessibility*="dyslexia-font"] pre,
[data-accessibility*="dyslexia-font"] .code-block,
[data-accessibility*="dyslexia-font"] #code-input,
[data-accessibility*="dyslexia-font"] textarea {
  font-family: 'OpenDyslexic', 'Cascadia Code', 'Fira Code', monospace !important;
}

/* ────────────────────────────────────────────────────────── */
/* Reduced Motion Support */
/* ────────────────────────────────────────────────────────── */

@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

[data-accessibility*="reduced-motion"],
[data-accessibility*="reduced-motion"] * {
  animation: none !important;
  transition: none !important;
}

/* ────────────────────────────────────────────────────────── */
/* High Contrast Mode */
/* ────────────────────────────────────────────────────────── */

[data-accessibility*="high-contrast"] {
  --shadow: none;
  background: #000 !important;
  color: #fff !important;
}

[data-accessibility*="high-contrast"] * {
  border-width: 2px;
  outline-width: 2px;
  background: #000 !important;
  color: #fff !important;
}

[data-accessibility*="high-contrast"] button,
[data-accessibility*="high-contrast"] a {
  border: 2px solid #fff;
  text-decoration: underline;
  background: #000 !important;
  color: #fff !important;
}

[data-accessibility*="high-contrast"] .btn-primary,
[data-accessibility*="high-contrast"] button[class*="btn-primary"] {
  border: 2px solid #ffff00;
  background: #000 !important;
  color: #ffff00 !important;
}

[data-accessibility*="high-contrast"] input,
[data-accessibility*="high-contrast"] textarea,
[data-accessibility*="high-contrast"] select {
  background: #000 !important;
  color: #fff !important;
  border: 2px solid #fff !important;
}

[data-accessibility*="high-contrast"] input:focus,
[data-accessibility*="high-contrast"] textarea:focus,
[data-accessibility*="high-contrast"] select:focus {
  border-color: #ffff00 !important;
  box-shadow: 0 0 0 2px #ffff00 !important;
}

/* ────────────────────────────────────────────────────────── */
/* Font Size Scaling */
/* ────────────────────────────────────────────────────────── */

:root {
  --base-font-size: 14px;
}

[data-font-size="80"] {
  font-size: calc(var(--base-font-size) * 0.8);
}

[data-font-size="90"] {
  font-size: calc(var(--base-font-size) * 0.9);
}

[data-font-size="100"] {
  font-size: calc(var(--base-font-size) * 1);
}

[data-font-size="110"] {
  font-size: calc(var(--base-font-size) * 1.1);
}

[data-font-size="120"] {
  font-size: calc(var(--base-font-size) * 1.2);
}

[data-font-size="130"] {
  font-size: calc(var(--base-font-size) * 1.3);
}

[data-font-size="140"] {
  font-size: calc(var(--base-font-size) * 1.4);
}

[data-font-size="150"] {
  font-size: calc(var(--base-font-size) * 1.5);
}

[data-font-size="160"] {
  font-size: calc(var(--base-font-size) * 1.6);
}

[data-font-size="170"] {
  font-size: calc(var(--base-font-size) * 1.7);
}

[data-font-size="180"] {
  font-size: calc(var(--base-font-size) * 1.8);
}

[data-font-size="190"] {
  font-size: calc(var(--base-font-size) * 1.9);
}

[data-font-size="200"] {
  font-size: calc(var(--base-font-size) * 2);
}

/* ────────────────────────────────────────────────────────── */
/* Focus Indicators */
/* ────────────────────────────────────────────────────────── */

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 2px;
}

button:focus-visible,
a:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}