/* Reset */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

input, button, textarea, select {
  font: inherit;
}

p, h1, h2, h3, h4, h5, h6 {
  overflow-wrap: break-word;
}

img, picture, video, canvas, svg {
  display: block;
  max-width: 100%;
}

/* Tokens */
:root {
  --bg: #fafaf9;
  --bg-surface: #f5f5f4;
  --bg-inset: #e7e5e4;
  --text: #0c0a09;
  --text-secondary: #44403c;
  --text-muted: #a8a29e;
  --border: #292524;
  --border-focus: #ea580c;
  --accent: #ea580c;
  --accent-hover: #c2410c;
  --accent-subtle: #fff7ed;
  --danger: #dc2626;
  --danger-hover: #b91c1c;
  --error: #ef4444;
  --error-bg: #fef2f2;
  --code-bg: #1c1917;
  --code-text: #e7e5e4;
  --radius: 0;
  --radius-lg: 0;
  --shadow-xs: none;
  --shadow-sm: none;
  --shadow: none;
  --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  --font-mono: 'SF Mono', SFMono-Regular, ui-monospace, Consolas, 'Liberation Mono', monospace;
  --transition: 100ms ease;
  --max-width: 860px;
  --border-w: 2px;
}

[data-theme="d"] {
  --bg: #0c0a09;
  --bg-surface: #1c1917;
  --bg-inset: #292524;
  --text: #fafaf9;
  --text-secondary: #a8a29e;
  --text-muted: #78716c;
  --border: #57534e;
  --accent: #fb923c;
  --accent-hover: #fdba74;
  --accent-subtle: #431407;
  --danger: #f87171;
  --danger-hover: #fca5a5;
  --error: #f87171;
  --error-bg: #2d1515;
  --code-bg: #0c0a09;
  --code-text: #e7e5e4;
}

/* Body */
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  font-size: 16px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background var(--transition), color var(--transition);
  -webkit-font-smoothing: antialiased;
}

/* Header */
header {
  border-bottom: var(--border-w) solid var(--border);
  background: var(--bg-surface);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
  height: 3.5rem;
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.logo {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.125rem;
  color: var(--text);
  text-decoration: none;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

nav {
  display: flex;
  gap: 1rem;
  margin-right: auto;
}

nav a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.8125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  transition: color var(--transition);
}

nav a:hover {
  color: var(--text);
}

/* Theme toggle */
.theme-toggle {
  background: none;
  border: var(--border-w) solid var(--border);
  border-radius: var(--radius);
  width: 2.25rem;
  height: 2.25rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  transition: all var(--transition);
}

.theme-toggle:hover {
  background: var(--bg-inset);
  color: var(--text);
}

.theme-icon::before {
  content: '\2600';
  font-size: 0.95rem;
}

[data-theme="d"] .theme-icon::before {
  content: '\263D';
}

/* Main */
main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1.5rem;
  width: 100%;
  flex: 1;
}

/* Tabs */
.tab-input {
  display: none;
}

.tab {
  display: inline-block;
  padding: 0.5rem 1rem;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-muted);
  cursor: pointer;
  border-bottom: var(--border-w) solid transparent;
  margin-bottom: -1px;
  transition: all var(--transition);
  user-select: none;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.tab:hover {
  color: var(--text-secondary);
}

.tab-input:checked + .tab {
  color: var(--text);
  border-bottom-color: var(--accent);
}

.character-count {
  margin-left: auto;
  font-size: 0.75rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
  align-self: center;
}

/* Editor + Preview panels */
#editor-container,
#preview-container {
  display: none;
}

#tab1:checked ~ form > #editor-container {
  display: block;
}

#tab2:checked ~ form > #preview-container {
  display: block;
}

#editor-container {
  border: var(--border-w) solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--bg);
  box-shadow: var(--shadow-xs);
  transition: border-color var(--transition), box-shadow var(--transition);
}

#editor-container:focus-within {
  border-color: var(--accent);
  box-shadow: none;
}

#pasteTextArea {
  display: none;
}

.CodeMirror {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  line-height: 1.7;
  height: auto;
  padding: 0.25rem 0;
  background: var(--bg) !important;
  color: var(--text) !important;
}

.CodeMirror-scroll {
  min-height: 18rem;
}

[data-theme="d"] .CodeMirror {
  background: var(--bg-surface) !important;
}

#preview-container {
  padding: 1.5rem;
  border: var(--border-w) solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--bg);
  min-height: 18rem;
  box-shadow: var(--shadow-xs);
  font-size: 1.0625rem;
}

/* Forms */
.form-row {
  display: flex;
  gap: 0.75rem;
  margin-top: 0.75rem;
}

.form-group {
  flex: 1;
}

input[type="text"],
input[type="email"],
input[type="password"],
textarea {
  width: 100%;
  padding: 0.625rem 0.875rem;
  font-size: 0.875rem;
  font-family: var(--font-mono);
  background: var(--bg);
  color: var(--text);
  border: var(--border-w) solid var(--border);
  border-radius: var(--radius);
  transition: all var(--transition);
  outline: none;
}

input[type="text"]:focus,
input[type="email"]:focus,
input[type="password"]:focus,
textarea:focus {
  border-color: var(--accent);
  box-shadow: none;
}

input[type="text"]::placeholder {
  color: var(--text-muted);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

.error {
  display: block;
  color: var(--error);
  font-size: 0.8125rem;
  margin-top: 0.25rem;
}

/* Buttons */
.form-actions {
  display: flex;
  gap: 0.5rem;
  margin-top: 1rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.5rem 1.25rem;
  font-size: 0.8125rem;
  font-weight: 600;
  border-radius: var(--radius);
  border: var(--border-w) solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: all var(--transition);
  line-height: 1.5;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.btn:active {
  transform: scale(0.97);
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

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

.btn-secondary {
  background: transparent;
  color: var(--text-secondary);
  border-color: var(--border);
}

.btn-secondary:hover {
  background: var(--bg-inset);
  color: var(--text);
  border-color: var(--text-muted);
}

.btn-danger {
  background: transparent;
  color: var(--danger);
  border-color: var(--border);
}

.btn-danger:hover {
  background: var(--danger);
  color: #fff;
  border-color: var(--danger);
}

button:disabled {
  opacity: 0.5;
  cursor: default;
  transform: none;
}

/* Paste display */
.paste-container {
  padding: 1.5rem;
  font-size: 1.0625rem;
  line-height: 1.7;
}

.paste-container h1 { font-size: 1.875rem; margin: 1.25rem 0; font-weight: 700; }
.paste-container h2 { font-size: 1.5rem; margin: 1.25rem 0; font-weight: 600; }
.paste-container h3 { font-size: 1.25rem; margin: 1rem 0; font-weight: 600; }
.paste-container h4 { font-size: 1.125rem; margin: 1rem 0; font-weight: 600; }
.paste-container h5 { font-size: 1rem; margin: 0.75rem 0; font-weight: 600; }
.paste-container h6 { font-size: 1rem; margin: 0.75rem 0; font-weight: 500; }

.paste-container :where(h1, h2, h3, h4, h5, h6) > a {
  color: var(--text) !important;
  text-decoration: none;
}

.paste-container :where(h1, h2, h3, h4, h5, h6):hover > a {
  text-decoration: underline;
}

.paste-container :where(h1, h2, h3, h4, h5, h6):hover > a::after {
  content: ' #';
  color: var(--text-muted);
  font-weight: 400;
}

.paste-container p {
  margin: 0.75rem 0;
}

.paste-container a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.paste-container a:hover {
  color: var(--accent-hover);
}

.paste-container pre {
  padding: 1rem 1.25rem;
  margin: 1rem 0;
  border-radius: var(--radius);
  overflow: auto;
  background: var(--code-bg);
  color: var(--code-text);
  font-size: 0.875rem;
  line-height: 1.6;
}

.paste-container code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background: var(--bg-inset);
  padding: 0.125rem 0.375rem;
  border-radius: 0;
}

.paste-container pre code {
  background: none;
  padding: 0;
  font-size: inherit;
  color: inherit;
}

.paste-container blockquote {
  padding: 0.5rem 1rem;
  margin: 0.75rem 0;
  border-left: 4px solid var(--accent);
  color: var(--text-secondary);
  background: var(--accent-subtle);
  border-radius: 0 var(--radius) var(--radius) 0;
}

.paste-container table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0;
}

.paste-container :where(td, th) {
  border: var(--border-w) solid var(--border);
  padding: 0.5rem 0.75rem;
  text-align: left;
}

.paste-container th {
  background: var(--bg-surface);
  font-weight: 600;
}

.paste-container ul {
  list-style-type: disc;
  padding-left: 1.5rem;
  margin: 0.5rem 0;
}

.paste-container ul ul {
  padding-left: 1.5rem;
  margin: 0;
}

.paste-container ol {
  padding-left: 1.5rem;
  margin: 0.5rem 0;
}

.paste-container hr {
  border: none;
  border-top: var(--border-w) solid var(--border);
  margin: 2rem 0;
}

.paste-container img {
  border-radius: var(--radius);
}

/* Table of Contents */
.paste-container .toc {
  background: var(--bg-surface);
  border: var(--border-w) solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1rem 1.25rem;
  margin: 1rem 0;
}

.paste-container .toc ul {
  list-style: none;
  padding-left: 0;
  margin: 0;
}

.paste-container .toc ul ul {
  padding-left: 1.25rem;
}

.paste-container .toc a {
  text-decoration: none;
  color: var(--text-secondary);
  font-size: 0.875rem;
}

.paste-container .toc a:hover {
  color: var(--accent);
}

/* Delete confirm */
.delete-confirm {
  background: var(--error-bg);
  border: var(--border-w) solid var(--error);
  border-radius: var(--radius-lg);
  padding: 1.25rem 1.5rem;
  margin-bottom: 1rem;
}

.delete-confirm p {
  color: var(--error);
}

.delete-confirm strong {
  color: var(--text);
}

/* Error page */
.error-page {
  text-align: center;
  padding: 4rem 1.5rem;
}

.error-page h1 {
  font-size: 4rem;
  font-weight: 800;
  color: var(--text-muted);
  line-height: 1;
  margin-bottom: 0.5rem;
}

.error-page p {
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
}

/* Demo alert */
.demo-alert {
  max-width: var(--max-width);
  margin: 0.75rem auto;
  padding: 0.75rem 1.5rem;
  background: #fef3c7;
  color: #92400e;
  border: var(--border-w) solid #fcd34d;
  border-radius: var(--radius);
  font-size: 0.875rem;
  text-align: center;
}

[data-theme="d"] .demo-alert {
  background: #422006;
  color: #fcd34d;
  border-color: #854d0e;
}

/* Footer */
footer {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1.5rem;
  width: 100%;
  border-top: var(--border-w) solid var(--border);
  text-align: center;
}

footer a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.8125rem;
}

footer a:hover {
  color: var(--text-secondary);
}

/* Preview content (reuse paste styles) */
#preview-container h1, #preview-container h2, #preview-container h3,
#preview-container h4, #preview-container h5, #preview-container h6 {
  margin: 1rem 0 0.5rem;
}

#preview-container h1 { font-size: 1.875rem; font-weight: 700; }
#preview-container h2 { font-size: 1.5rem; font-weight: 600; }
#preview-container h3 { font-size: 1.25rem; font-weight: 600; }

#preview-container p {
  margin: 0.5rem 0;
}

#preview-container a {
  color: var(--accent);
}

#preview-container pre {
  padding: 1rem 1.25rem;
  margin: 1rem 0;
  border-radius: var(--radius);
  overflow: auto;
  background: var(--code-bg);
  color: var(--code-text);
  font-size: 0.875rem;
}

#preview-container code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background: var(--bg-inset);
  padding: 0.125rem 0.375rem;
  border-radius: 0;
}

#preview-container pre code {
  background: none;
  padding: 0;
  color: inherit;
}

#preview-container blockquote {
  padding: 0.5rem 1rem;
  margin: 0.75rem 0;
  border-left: 4px solid var(--accent);
  color: var(--text-secondary);
}

#preview-container ul {
  padding-left: 1.5rem;
  margin: 0.5rem 0;
}

#preview-container ol {
  padding-left: 1.5rem;
  margin: 0.5rem 0;
}

#preview-container hr {
  border: none;
  border-top: var(--border-w) solid var(--border);
  margin: 1.5rem 0;
}

#preview-container table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0;
}

#preview-container :where(td, th) {
  border: var(--border-w) solid var(--border);
  padding: 0.5rem 0.75rem;
}

#preview-container img {
  max-width: 100%;
  border-radius: var(--radius);
}

/* Responsive */
@media (max-width: 640px) {
  .header-inner {
    padding: 0 1rem;
    gap: 1rem;
  }

  main {
    padding: 1rem;
  }

  .form-row {
    flex-direction: column;
  }

  .form-actions {
    flex-wrap: wrap;
  }

  .paste-container {
    padding: 1rem 0;
  }

  .error-page h1 {
    font-size: 3rem;
  }
}

/* History list */
.history-list {
  list-style: none;
  padding: 0;
  margin: 1rem 0;
}

.history-list li {
  border-bottom: var(--border-w) solid var(--border);
}

.history-list li:first-child {
  border-top: var(--border-w) solid var(--border);
}

.history-list a {
  display: block;
  padding: 0.75rem 0;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--text);
  text-decoration: none;
  text-transform: uppercase;
  letter-spacing: 0.025em;
}

.history-list a:hover {
  color: var(--accent);
}

/* TTL select */
.ttl-select {
  width: 100%;
  padding: 0.625rem 0.75rem;
  border: var(--border-w) solid var(--border);
  background: var(--bg);
  color: var(--text);
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  cursor: pointer;
  -webkit-appearance: none;
  appearance: none;
}

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

/* Syntax highlighting (highlight.js) */
.hljs {
  color: var(--code-text);
  background: var(--code-bg);
}

:root {
  --hljs-keyword: #c2410c;
  --hljs-string: #16a34a;
  --hljs-number: #2563eb;
  --hljs-comment: #78716c;
  --hljs-function: #ea580c;
  --hljs-variable: #0891b2;
  --hljs-type: #7c3aed;
  --hljs-tag: #dc2626;
  --hljs-attr: #ea580c;
  --hljs-built-in: #0891b2;
}

[data-theme="d"] {
  --hljs-keyword: #fb923c;
  --hljs-string: #4ade80;
  --hljs-number: #60a5fa;
  --hljs-comment: #78716c;
  --hljs-function: #fdba74;
  --hljs-variable: #22d3ee;
  --hljs-type: #a78bfa;
  --hljs-tag: #f87171;
  --hljs-attr: #fb923c;
  --hljs-built-in: #22d3ee;
}

.hljs-keyword,
.hljs-selector-tag,
.hljs-literal,
.hljs-section { color: var(--hljs-keyword); font-weight: 700; }

.hljs-string,
.hljs-template-variable,
.hljs-addition,
.hljs-regexp { color: var(--hljs-string); }

.hljs-number,
.hljs-meta { color: var(--hljs-number); }

.hljs-comment,
.hljs-quote { color: var(--hljs-comment); font-style: italic; }

.hljs-title,
.hljs-title.function_ { color: var(--hljs-function); font-weight: 700; }

.hljs-variable,
.hljs-template-tag,
.hljs-deletion { color: var(--hljs-variable); }

.hljs-type,
.hljs-title.class_ { color: var(--hljs-type); font-weight: 700; }

.hljs-tag { color: var(--hljs-tag); }

.hljs-name,
.hljs-attribute { color: var(--hljs-attr); }

.hljs-built_in,
.hljs-symbol { color: var(--hljs-built-in); }

.hljs-subst { color: var(--code-text); }

.hljs-emphasis { font-style: italic; }
.hljs-strong { font-weight: 700; }