/*
 * style.css — Core layout, typography, and design tokens.
 * Loaded on every page. See components.css for specialized tool styles.
 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

/* Design tokens */
:root {
  --color-text: #333;
  --color-text-muted: #6c757d;
  --color-text-heading: #2d3748;
  --color-text-secondary: #4a5568;
  --color-text-tertiary: #718096;
  --color-bg-body: #f5f5f5;
  --color-bg-container: #fff;
  --color-bg-header: #2d3748;
  --color-bg-card: #f8fafc;
  --color-bg-form: #f8f9fa;
  --color-bg-input: #fff;
  --color-bg-code: #e9ecef;
  --color-border: #e2e8f0;
  --color-border-form: #e9ecef;
  --color-border-dark: #cbd5e0;
  --color-primary: #3182ce;
  --color-primary-hover: #2c5aa0;
  --color-error: #dc3545;
  --color-error-bg: #f8d7da;
  --color-error-border: #f5c6cb;
  --color-error-text: #991b1b;
  --color-success: #16a34a;
  --color-success-hover: #15803d;
  --color-success-bg: #f0fdf4;
  --color-success-border: #bbf7d0;
  --color-success-text: #14532d;
  --color-info-bg: #eff6ff;
  --color-info-border: #bfdbfe;
  --color-tag-bg: var(--color-primary);
  --color-tag-text: #fff;
  --color-header-text: #fff;
  --color-header-breadcrumb: #cbd5e0;
  --color-header-separator: #718096;
  --color-header-border: transparent;
  --shadow-container: 0 2px 8px rgb(0, 0, 0, 0.1);
  --shadow-hover: 0 4px 12px rgb(0, 0, 0, 0.08);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --color-text: #e2e8f0;
    --color-text-muted: #a0aec0;
    --color-text-heading: #e2e8f0;
    --color-text-secondary: #cbd5e0;
    --color-text-tertiary: #a0aec0;
    --color-bg-body: #1a202c;
    --color-bg-container: #2d3748;
    --color-bg-header: #1a202c;
    --color-bg-card: #1a202c;
    --color-bg-form: #1a202c;
    --color-bg-input: #2d3748;
    --color-bg-code: #2d3748;
    --color-border: #4a5568;
    --color-border-form: #4a5568;
    --color-border-dark: #4a5568;
    --color-primary: #63b3ed;
    --color-primary-hover: #90cdf4;
    --color-error: #fc8181;
    --color-error-bg: #742a2a;
    --color-error-border: #9b2c2c;
    --color-error-text: #feb2b2;
    --color-success: #4ade80;
    --color-success-hover: #86efac;
    --color-success-bg: #1e4d2b;
    --color-success-border: #15803d;
    --color-success-text: #bbf7d0;
    --color-info-bg: #1e3a5f;
    --color-info-border: #2c5aa0;
    --color-tag-text: #1a202c;
    --color-header-breadcrumb: #cbd5e0;
    --color-header-separator: #718096;
    --color-header-border: #4a5568;
    --shadow-container: 0 2px 8px rgb(0, 0, 0, 0.4);
    --shadow-hover: 0 4px 12px rgb(0, 0, 0, 0.3);
  }
}

[data-theme="dark"] {
  --color-text: #e2e8f0;
  --color-text-muted: #a0aec0;
  --color-text-heading: #e2e8f0;
  --color-text-secondary: #cbd5e0;
  --color-text-tertiary: #a0aec0;
  --color-bg-body: #1a202c;
  --color-bg-container: #2d3748;
  --color-bg-header: #1a202c;
  --color-bg-card: #1a202c;
  --color-bg-form: #1a202c;
  --color-bg-input: #2d3748;
  --color-bg-code: #2d3748;
  --color-border: #4a5568;
  --color-border-form: #4a5568;
  --color-border-dark: #4a5568;
  --color-primary: #63b3ed;
  --color-primary-hover: #90cdf4;
  --color-error: #fc8181;
  --color-error-bg: #742a2a;
  --color-error-border: #9b2c2c;
  --color-error-text: #feb2b2;
  --color-success: #4ade80;
  --color-success-hover: #86efac;
  --color-success-bg: #1e4d2b;
  --color-success-border: #15803d;
  --color-success-text: #bbf7d0;
  --color-info-bg: #1e3a5f;
  --color-info-border: #2c5aa0;
  --color-tag-text: #1a202c;
  --color-header-breadcrumb: #cbd5e0;
  --color-header-separator: #718096;
  --color-header-border: #4a5568;
  --shadow-container: 0 2px 8px rgb(0, 0, 0, 0.4);
  --shadow-hover: 0 4px 12px rgb(0, 0, 0, 0.3);
}

/* Accent color overrides */
[data-accent="green"] {
  --color-primary: #16a34a;
  --color-primary-hover: #15803d;
}

[data-accent="amber"] {
  --color-primary: #d97706;
  --color-primary-hover: #b45309;
}

[data-accent="purple"] {
  --color-primary: #7c3aed;
  --color-primary-hover: #6d28d9;
}

/* Dark accent variants — forced dark */
[data-theme="dark"][data-accent="green"] {
  --color-primary: #4ade80;
  --color-primary-hover: #86efac;
}

[data-theme="dark"][data-accent="amber"] {
  --color-primary: #fbbf24;
  --color-primary-hover: #fcd34d;
}

[data-theme="dark"][data-accent="purple"] {
  --color-primary: #a78bfa;
  --color-primary-hover: #c4b5fd;
}

/* Dark accent variants — system dark */
@media (prefers-color-scheme: dark) {
  [data-accent="green"]:not([data-theme="light"]) {
    --color-primary: #4ade80;
    --color-primary-hover: #86efac;
  }

  [data-accent="amber"]:not([data-theme="light"]) {
    --color-primary: #fbbf24;
    --color-primary-hover: #fcd34d;
  }

  [data-accent="purple"]:not([data-theme="light"]) {
    --color-primary: #a78bfa;
    --color-primary-hover: #c4b5fd;
  }
}

html {
  font-size: 16px;
}

body {
  font-family: system-ui, sans-serif;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg-body);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='4' height='4' viewBox='0 0 4 4'%3E%3Cpath fill='%23e0e0e0' fill-opacity='0.3' d='M1 3h1v1H1V3zm2-2h1v1H3V1z'%3E%3C/path%3E%3C/svg%3E");
  padding: 2rem 1rem;
}

/* Container */
.container {
  max-width: 960px;
  margin: 0 auto;
  background: var(--color-bg-container);
  border-radius: 8px;
  box-shadow: var(--shadow-container);
  overflow: hidden;
}

/* Header */
.header {
  position: relative;
  background: var(--color-bg-header);
  color: var(--color-header-text);
  border-bottom: 1px solid var(--color-header-border);
  padding: 2rem;
  text-align: center;
}

.header-controls {
  position: absolute;
  top: 0.75rem;
  right: 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.lang-switch {
  font-size: 0.8rem;
  color: var(--color-header-text);
  text-decoration: none;
  opacity: 0.7;
  padding: 0.25rem 0.5rem;
  border: 1px solid currentcolor;
  border-radius: 0.25rem;
  transition: opacity 0.2s;
}

.lang-switch:hover {
  opacity: 1;
}

.header-controls .theme-toggle {
  position: static;
  width: auto;
  height: auto;
  border-radius: 0.25rem;
  border: 1px solid var(--color-header-text);
  background: transparent;
  color: var(--color-header-text);
  opacity: 0.7;
  padding: 0.25rem 0.5rem;
  font-size: 0.8rem;
  z-index: auto;
  transition: opacity 0.2s;
}

.header-controls .theme-toggle:hover,
.header-controls .theme-toggle:focus {
  opacity: 1;
}

.header-controls .theme-toggle svg {
  width: 14px;
  height: 14px;
}

.header.compact {
  padding: 1.5rem 2rem;
}

.header h1 {
  font-size: 2rem;
  font-weight: 600;
  margin-bottom: 1rem;
}

.header.compact h1 {
  font-size: 1.75rem;
  margin-bottom: 0.5rem;
}

.header p {
  font-size: 1rem;
  opacity: 0.9;
  max-width: 500px;
  margin: 0 auto;
}

/* Profile Image */
.profile-image {
  width: 100px;
  height: 100px;
  border-radius: 50%;
  border: 3px solid white;
  margin: 1.5rem auto 0;
  display: block;
}

.header.compact .profile-image {
  width: 80px;
  height: 80px;
  margin: 1rem auto 0;
}

/* Main Content */
.main-content {
  padding: 2rem 3rem;
}

.section {
  margin-bottom: 2rem;
}

.section h2 {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--color-text-heading);
  margin-bottom: 1rem;
  border-bottom: 2px solid var(--color-border);
  padding-bottom: 0.5rem;
}

/* Internal Links */
.internal-links {
  list-style: none;
  padding: 0;
  margin: 0;
}

.internal-links li {
  margin-bottom: 0.5rem;
}

.internal-links a {
  color: var(--color-primary);
  text-decoration: none;
  font-weight: 500;
}

.internal-links a:hover {
  text-decoration: underline;
}

.internal-links a:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.internal-links a strong::after {
  content: ": ";
}

.internal-links a span {
  font-weight: 400;
  color: var(--color-text-muted);
}

/* External Links */
.external-links {
  list-style: none;
}

.external-links li {
  margin-bottom: 0.5rem;
}

.external-links a {
  color: var(--color-primary);
  text-decoration: none;
  font-weight: 500;
}

.external-links a:hover {
  text-decoration: underline;
}

/* Game List */
.game-list {
  list-style: none;
}

.game-item {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  transition: all 0.2s ease;
}

.game-item:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-hover);
}

.game-item h3 {
  font-size: 1.4rem;
  font-weight: 600;
  color: var(--color-text-heading);
  margin-bottom: 0.75rem;
}

.game-item h3 a {
  color: var(--color-text-heading);
  text-decoration: none;
}

.game-item h3 a:hover {
  color: var(--color-primary);
}

.game-item p {
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: 1rem;
}

.game-meta {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.tag {
  background: var(--color-tag-bg);
  color: var(--color-tag-text);
  padding: 0.25rem 0.75rem;
  border-radius: 12px;
  font-size: 0.85rem;
  font-weight: 500;
}

.back-link {
  display: inline-block;
  color: var(--color-primary);
  text-decoration: none;
  font-weight: 500;
  padding: 0.5rem 1rem;
  border: 1px solid var(--color-primary);
  border-radius: 4px;
  transition: all 0.2s ease;
}

.back-link:hover {
  background: var(--color-primary);
  color: var(--color-tag-text);
}

/* Breadcrumb Navigation */
.breadcrumbs {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.95em;
  color: var(--color-text-tertiary);
  margin-bottom: 1.5rem;
}

.breadcrumbs a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color 0.2s ease;
}

.breadcrumbs a:hover {
  color: var(--color-primary-hover);
  text-decoration: underline;
}

.breadcrumbs a:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: 2px;
}

.breadcrumbs .separator {
  color: var(--color-border-dark);
  user-select: none;
}

.breadcrumbs .current {
  color: var(--color-text-heading);
}

/* When breadcrumbs are in header, use light colors */
.header .breadcrumbs {
  color: var(--color-header-breadcrumb);
  margin-bottom: 1rem;
}

.header .breadcrumbs a {
  color: var(--color-header-breadcrumb);
}

.header .breadcrumbs a:hover {
  color: var(--color-header-text);
}

.header .breadcrumbs .current {
  color: var(--color-header-text);
}

.header .breadcrumbs .separator {
  color: var(--color-header-separator);
}

/* Project Links */
.links-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1rem;
  margin-top: 1rem;
}

.link-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  padding: 1.5rem;
  text-decoration: none;
  color: inherit;
  display: block;
  transition: border-color 0.2s ease;
}

.link-card:hover {
  border-color: var(--color-primary);
}

.link-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-text-heading);
  margin-bottom: 0.5rem;
}

.link-card p {
  color: var(--color-text-tertiary);
  font-size: 0.9rem;
  margin: 0;
}

/* Form Elements */
input,
textarea {
  font-family: monospace;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  padding: 0.5rem;
  font-size: 0.9rem;
  background: var(--color-bg-input);
  color: var(--color-text);
}

input:focus,
textarea:focus {
  outline: none;
  border-color: var(--color-primary);
}

input {
  min-width: 3em;
}

textarea {
  height: 100px;
  width: 100%;
  max-width: 500px;
  resize: vertical;
}

/* Tables */
table {
  border-collapse: collapse;
  width: 100%;
  background: var(--color-bg-container);
  border-radius: 4px;
  overflow: hidden;
  border: 1px solid var(--color-border);
}

td {
  border: 1px solid var(--color-border);
  padding: 0.5rem;
  text-align: left;
}

/* Form Components */
.form-container {
  background: var(--color-bg-form);
  padding: 1.5rem;
  border-radius: 8px;
  margin: 1.5rem 0;
  border: 1px solid var(--color-border-form);
}

.form-group {
  margin-bottom: 1rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 600;
  color: var(--color-text-heading);
}

.form-input {
  width: 100%;
  max-width: 500px;
  padding: 0.75rem;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  font-size: 1rem;
  font-family: monospace;
  background: var(--color-bg-input);
  color: var(--color-text);
}

.form-input:focus {
  outline: none;
  border-color: var(--color-primary);
}

.form-group small {
  display: block;
  margin-top: 0.25rem;
  color: var(--color-text-muted);
  font-size: 0.875rem;
}

.form-inline-group {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 1rem;
}

.form-inline-group .form-group {
  flex: 1;
  min-width: 150px;
  margin-bottom: 0;
}

.form-select {
  padding: 0.5rem;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  font-size: 0.9rem;
  background: var(--color-bg-input);
  color: var(--color-text);
  cursor: pointer;
}

.form-select:focus {
  outline: none;
  border-color: var(--color-primary);
}

.form-textarea {
  width: 100%;
  min-height: 150px;
  padding: 0.75rem;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  font-family: monospace;
  font-size: 0.9rem;
  resize: vertical;
  background: var(--color-bg-input);
  color: var(--color-text);
}

.form-textarea:focus {
  outline: none;
  border-color: var(--color-primary);
}

.probability-sample {
  background: var(--color-bg-container);
  border: 1px solid var(--color-border-form);
  border-radius: 4px;
  padding: 10px;
  margin-bottom: 8px;
  font-family: monospace;
  font-size: 13px;
}

.probability-sample strong {
  color: var(--color-primary);
}

.submit-btn {
  background: var(--color-primary);
  color: var(--color-tag-text);
  border: none;
  padding: 0.75rem 1.5rem;
  border-radius: 4px;
  font-size: 1rem;
  cursor: pointer;
}

.submit-btn:hover {
  background: var(--color-primary-hover);
}

.submit-btn:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* Output Displays */
.output-display {
  margin: 2rem 0;
  overflow-x: auto;
}

.output-box {
  margin: 1.5rem 0;
  padding: 1rem;
  background: var(--color-bg-code);
  border: 2px dashed var(--color-text-muted);
  border-radius: 4px;
  font-family: monospace;
  font-size: 1.2rem;
  font-weight: 600;
  text-align: center;
  min-height: 3rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

.error-message {
  color: var(--color-error);
  font-weight: 600;
  display: block;
  margin: 1rem 0;
  padding: 0.75rem;
  background: var(--color-error-bg);
  border: 1px solid var(--color-error-border);
  border-radius: 4px;
}

/* Example Sections */
.examples {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1rem;
  margin-top: 1rem;
}

.example-item {
  background: var(--color-bg-card);
  padding: 1rem;
  border-radius: 4px;
  border: 1px solid var(--color-border);
  cursor: pointer;
}

.example-item:hover {
  background: var(--color-border);
  border-color: var(--color-primary);
}

.example-item code {
  background: var(--color-bg-code);
  padding: 0.25rem 0.5rem;
  border-radius: 3px;
  font-size: 0.9rem;
  display: block;
  margin-top: 0.5rem;
}

/* Info Boxes */
.info-box {
  background: var(--color-bg-form);
  padding: 1rem;
  border-radius: 4px;
  border: 1px solid var(--color-border-form);
  margin: 1rem 0;
}

.info-box h3 {
  margin-top: 0;
  color: var(--color-text-secondary);
}

.info-box ul {
  margin-left: 1.5rem;
  margin-bottom: 1rem;
}

.info-box li {
  margin-bottom: 0.25rem;
}

/* Accessibility - Focus indicators */
a:focus,
button:focus,
input:focus,
textarea:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* Skip link for keyboard navigation */
.skip-link {
  position: absolute;
  top: -40px;
  left: 6px;
  background: var(--color-bg-header);
  color: var(--color-header-text);
  padding: 8px;
  text-decoration: none;
  border-radius: 4px;
  z-index: 1000;
}

.skip-link:focus {
  top: 6px;
}

/* Ensure interactive elements are keyboard accessible */
button,
a,
input,
textarea {
  cursor: pointer;
}

/* Dark mode background pattern override */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) body {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='4' height='4' viewBox='0 0 4 4'%3E%3Cpath fill='%23000000' fill-opacity='0.3' d='M1 3h1v1H1V3zm2-2h1v1H3V1z'%3E%3C/path%3E%3C/svg%3E");
  }
}

[data-theme="dark"] body {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='4' height='4' viewBox='0 0 4 4'%3E%3Cpath fill='%23000000' fill-opacity='0.3' d='M1 3h1v1H1V3zm2-2h1v1H3V1z'%3E%3C/path%3E%3C/svg%3E");
}

/* Responsive Design */
@media (width <= 768px) {
  body {
    padding: 1rem 0.5rem;
  }

  .header {
    padding: 1.5rem 1rem;
  }

  .header-controls {
    position: static;
    display: flex;
    justify-content: center;
    margin-top: 0.5rem;
  }

  .main-content {
    padding: 1.5rem;
  }

  .links-grid {
    grid-template-columns: 1fr;
  }
}