/* Design System - Base Styles */
:root {
  /* Light theme colors */
  --bg: #ffffff;
  --bg-elev: #f5f5f5;
  --text: #1a1a1a;
  --muted: #666666;
  --accent: #0066cc;
  --error: #d32f2f;
  --ok: #2e7d32;
  --border: #e0e0e0;
  --shadow: rgba(0, 0, 0, 0.1);
  --focus-ring: 2px solid var(--accent);
}

[data-theme="dark"] {
  --bg: #1a1a1a;
  --bg-elev: #2d2d2d;
  --text: #e0e0e0;
  --muted: #999999;
  --accent: #4a9eff;
  --error: #f44336;
  --ok: #4caf50;
  --border: #404040;
  --shadow: rgba(0, 0, 0, 0.3);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  font-size: 1rem;
  line-height: 1.5;
  color: var(--text);
  background-color: var(--bg);
  transition: background-color 0.2s, color 0.2s;
}

/* Typography scale */
.text-xs { font-size: 0.75rem; }
.text-sm { font-size: 0.875rem; }
.text-base { font-size: 1rem; }
.text-lg { font-size: 1.125rem; }
.text-xl { font-size: 1.5rem; }
.text-2xl { font-size: 2rem; }

/* Spacing scale (4px steps) */
.m-1 { margin: 0.25rem; }
.m-2 { margin: 0.5rem; }
.m-3 { margin: 0.75rem; }
.m-4 { margin: 1rem; }
.m-6 { margin: 1.5rem; }
.m-8 { margin: 2rem; }

.p-1 { padding: 0.25rem; }
.p-2 { padding: 0.5rem; }
.p-3 { padding: 0.75rem; }
.p-4 { padding: 1rem; }
.p-6 { padding: 1.5rem; }
.p-8 { padding: 2rem; }

/* Header */
header {
  background-color: var(--bg-elev);
  border-bottom: 1px solid var(--border);
  padding: 1rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

header h1 {
  font-size: 1.5rem;
  font-weight: 600;
  margin: 0;
}

header a {
  color: var(--text);
  text-decoration: none;
}

header a:hover {
  color: var(--accent);
}

.search-box {
  position: relative;
  max-width: 600px;
  width: 100%;
  justify-self: center;
}

/* Navigation */
nav[aria-label="Breadcrumb"] {
  padding: 0.75rem 2rem;
  background-color: var(--bg);
  border-bottom: 1px solid var(--border);
  font-size: 0.875rem;
}

nav[aria-label="Breadcrumb"] a {
  color: var(--muted);
  text-decoration: none;
}

nav[aria-label="Breadcrumb"] a:hover {
  color: var(--accent);
}

nav[aria-label="Breadcrumb"] a:not(:last-child)::after {
  content: ' / ';
  margin: 0 0.5rem;
  color: var(--muted);
}

/* Main content */
main {
  max-width: 1400px;
  margin: 0 auto;
  padding: 2rem;
}

/* Regex tester - full width */
main:has(.regex-tester-tool) {
  max-width: 100% !important;
  width: 100% !important;
  padding: 1rem 2rem !important;
}

/* Reduce padding for JSON tools to maximize space */
main:has(.json-tool) {
  padding: 0.5rem 2rem 1rem;
}

/* Reduce padding for JSON/YAML converter to maximize space */
main:has(.json-yaml-tool) {
  padding: 0.5rem 1rem 1rem;
  max-width: 100% !important;
  width: 100% !important;
}

main:has(.json-yaml-tool) > h1 {
  margin-bottom: 0.25rem;
  font-size: 1.5rem;
}

main:has(.json-yaml-tool) > p {
  margin-bottom: 0.5rem;
  font-size: 1rem;
}

/* Reduce padding for YAML validator to maximize space */
main:has(.yaml-validator-tool) {
  padding: 0.5rem 2rem 1rem;
}

main:has(.yaml-validator-tool) > h1 {
  margin-bottom: 0.25rem;
  font-size: 1.5rem;
}

main:has(.yaml-validator-tool) > p {
  margin-bottom: 0.5rem;
  font-size: 1rem;
}

main:has(.json-tool) > h1 {
  margin-bottom: 0.25rem;
  font-size: 1.5rem;
}

main:has(.json-tool) > p {
  margin-bottom: 0.5rem;
  font-size: 1rem;
}

main > h1 {
  font-size: 2rem;
  margin-bottom: 1rem;
  font-weight: 600;
}

main > p {
  color: var(--muted);
  margin-bottom: 2rem;
  font-size: 1.125rem;
}

/* Tool panel layout */
.tool {
  display: grid;
  gap: 1.5rem;
  margin-bottom: 3rem;
}

@media (min-width: 1024px) {
  .tool {
    grid-template-columns: 1fr 1fr;
  }
}

/* JSON tools - make tool section fill viewport */
.json-tool {
  margin-bottom: 1rem;
  height: calc(100vh - 180px);
  min-height: calc(100vh - 180px);
}

.pane {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  min-width: 0; /* Allow flex items to shrink below content size */
  overflow: hidden; /* Prevent container overflow */
}

.pane label {
  font-weight: 500;
  font-size: 0.875rem;
  color: var(--text);
}

/* Textareas */
textarea {
  font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', 'Consolas', monospace;
  font-size: 0.875rem;
  line-height: 1.6;
  padding: 0.75rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background-color: var(--bg);
  color: var(--text);
  resize: vertical;
  min-height: 200px;
  width: 100%;
  transition: border-color 0.2s, box-shadow 0.2s;
  user-select: text;
  -webkit-user-select: text;
  -moz-user-select: text;
  -ms-user-select: text;
}

/* Override for JSON tools - must come after base textarea rule */
.json-tool textarea {
  min-height: calc(100vh - 220px) !important;
  height: calc(100vh - 220px) !important;
}

textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(74, 158, 255, 0.1);
}

textarea:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

/* Pre/Output */
pre {
  font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', 'Consolas', monospace;
  font-size: 0.875rem;
  line-height: 1.6;
  padding: 0.75rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background-color: var(--bg-elev);
  color: var(--text);
  overflow-x: auto;
  white-space: pre-wrap;
  word-wrap: break-word;
  min-height: 200px;
  max-width: 100%;
  box-sizing: border-box;
  user-select: text;
  -webkit-user-select: text;
  -moz-user-select: text;
  -ms-user-select: text;
}

pre.ok {
  border-color: var(--ok);
  background-color: rgba(46, 125, 50, 0.05);
}

pre.error {
  border-color: var(--error);
  background-color: rgba(211, 47, 47, 0.05);
}

/* Buttons */
button {
  font-family: inherit;
  font-size: 0.875rem;
  font-weight: 500;
  padding: 0.5rem 1rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background-color: var(--bg-elev);
  color: var(--text);
  cursor: pointer;
  transition: background-color 0.2s, border-color 0.2s, transform 0.1s;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

button:hover:not(:disabled) {
  background-color: var(--bg);
  border-color: var(--accent);
}

button:active:not(:disabled) {
  transform: translateY(1px);
}

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* Button-styled links */
a.button-link {
  font-family: inherit;
  font-size: 0.875rem;
  font-weight: 500;
  padding: 0.5rem 1rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background-color: var(--bg-elev);
  color: var(--text);
  cursor: pointer;
  transition: background-color 0.2s, border-color 0.2s, transform 0.1s;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
}

a.button-link:hover {
  background-color: var(--bg);
  border-color: var(--accent);
}

a.button-link:active {
  transform: translateY(1px);
}

button.primary {
  background-color: var(--accent);
  color: white;
  border-color: var(--accent);
}

button.primary:hover:not(:disabled) {
  background-color: #0052a3;
  border-color: #0052a3;
}

button.secondary {
  background-color: transparent;
}

button.ghost {
  background-color: transparent;
  border-color: transparent;
}

/* Actions bar */
.actions {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

/* Select, Input */
select, input[type="text"], input[type="number"] {
  font-family: inherit;
  font-size: 0.875rem;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background-color: var(--bg);
  color: var(--text);
  transition: border-color 0.2s;
}

select:focus, input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(74, 158, 255, 0.1);
}

/* Checkbox, Radio */
input[type="checkbox"], input[type="radio"] {
  width: 1rem;
  height: 1rem;
  accent-color: var(--accent);
  cursor: pointer;
}

/* Label */
label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
}

/* Tabs */
.tabs {
  display: flex;
  gap: 0.5rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 1rem;
}

.tabs button {
  border: none;
  border-bottom: 2px solid transparent;
  border-radius: 0;
  background: transparent;
  padding: 0.75rem 1rem;
  margin-bottom: -1px;
}

.tabs button.active {
  border-bottom-color: var(--accent);
  color: var(--accent);
}

/* Split view for diff */
.split-view {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

@media (max-width: 1023px) {
  .split-view {
    grid-template-columns: 1fr;
  }
}

/* FAQ section */
.faq {
  margin-top: 4rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
}

.faq h2 {
  font-size: 1.5rem;
  margin-bottom: 1.5rem;
}

.faq details {
  margin-bottom: 1rem;
}

.faq summary {
  font-weight: 500;
  cursor: pointer;
  padding: 0.75rem;
  background-color: var(--bg-elev);
  border-radius: 6px;
  user-select: none;
}

.faq summary:hover {
  background-color: var(--bg);
}

.faq details[open] summary {
  border-bottom-left-radius: 0;
  border-bottom-right-radius: 0;
}

.faq details p {
  padding: 0.75rem;
  background-color: var(--bg-elev);
  border-top: 1px solid var(--border);
  border-bottom-left-radius: 6px;
  border-bottom-right-radius: 6px;
  margin: 0;
}

/* Toast */
.toast {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  padding: 1rem 1.5rem;
  background-color: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 6px;
  box-shadow: 0 4px 12px var(--shadow);
  z-index: 1000;
  animation: slideIn 0.3s ease-out;
  max-width: 300px;
}

@keyframes slideIn {
  from {
    transform: translateX(100%);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

.toast.success {
  border-color: var(--ok);
  background-color: rgba(46, 125, 50, 0.1);
}

.toast.error {
  border-color: var(--error);
  background-color: rgba(211, 47, 47, 0.1);
}

/* Theme toggle */
.theme-toggle {
  background: transparent;
  border: 1px solid var(--border);
  padding: 0.5rem;
  border-radius: 6px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
}

/* Home page specific */
.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.tool-card {
  padding: 1.5rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background-color: var(--bg-elev);
  text-decoration: none;
  color: var(--text);
  display: block;
  transition: transform 0.2s, box-shadow 0.2s;
  position: relative;
  cursor: pointer;
}

.tool-card[draggable="true"] {
  cursor: grab;
}

.tool-card[draggable="true"]:active {
  cursor: grabbing;
}

.tool-card.dragging {
  opacity: 0.5;
  transform: scale(0.95);
}

.tool-card.drag-over {
  border-color: var(--accent);
  border-style: dashed;
}

.drag-handle {
  position: absolute;
  top: 0.5rem;
  right: 0.5rem;
  color: var(--muted);
  font-size: 1rem;
  line-height: 1;
  cursor: grab;
  user-select: none;
  opacity: 0;
  transition: opacity 0.2s;
  padding: 0.25rem;
  z-index: 1;
  pointer-events: none;
}

.tool-card:hover .drag-handle {
  opacity: 0.5;
}

.tool-card:hover .drag-handle:hover {
  opacity: 1;
}

.drag-handle:active {
  cursor: grabbing;
}

.tool-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px var(--shadow);
  border-color: var(--accent);
}

.tool-card h2 {
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
  color: var(--accent);
}

.tool-card p {
  font-size: 0.875rem;
  color: var(--muted);
  margin: 0;
}

/* Search box */
.search-box {
  position: relative;
  max-width: 600px;
  width: 100%;
}

.search-box input {
  width: 100%;
  padding: 0.5rem 2.5rem 0.5rem 0.75rem;
  height: 100%;
  box-sizing: border-box;
}

.search-box::after {
  content: '⌘K';
  position: absolute;
  right: 0.75rem;
  top: 50%;
  transform: translateY(-50%);
  font-size: 0.75rem;
  color: var(--muted);
  pointer-events: none;
}

/* Focus visible for accessibility */
*:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* Skip link */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--accent);
  color: white;
  padding: 0.5rem 1rem;
  text-decoration: none;
  z-index: 100;
}

.skip-link:focus {
  top: 0;
}

/* Loading state */
.loading {
  opacity: 0.6;
  pointer-events: none;
  position: relative;
}

.loading::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 20px;
  height: 20px;
  margin: -10px 0 0 -10px;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}