:root {
  --colour-bg: #fafafa;
  --colour-bg-secondary: #f4f4f5;
  --colour-border: #d4d4d8;
  --colour-text: #18181b;
  --colour-text-secondary: #52525b;
  --colour-primary: #2563eb;
  --colour-primary-hover: #1d4ed8;
  --colour-primary-light: #dbeafe;
  --colour-block-bg: #ffffff;
  --colour-block-border: #e4e4e7;
  --colour-shadow: rgba(0, 0, 0, 0.08);
  --colour-danger: #dc2626;

  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 0.75rem;
  --space-lg: 1rem;
  --space-xl: 1.5rem;
  --space-2xl: 2rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --colour-bg: #0a0a0a;
    --colour-bg-secondary: #171717;
    --colour-border: #2a2a2a;
    --colour-text: #fafafa;
    --colour-text-secondary: #a1a1aa;
    --colour-primary: #60a5fa;
    --colour-primary-hover: #93c5fd;
    --colour-primary-light: #1e3a8a;
    --colour-block-bg: #141414;
    --colour-block-border: #262626;
    --colour-shadow: rgba(0, 0, 0, 0.5);
    --colour-danger: #f87171;
  }
}

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

[hidden] {
  display: none !important;
}

html,
body {
  height: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.5;
  color: var(--colour-text);
  background: var(--colour-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
}

/* Drop overlay — covers the page during drag */
body.dragover::after {
  content: "Drop your feed file";
  position: fixed;
  inset: var(--space-lg);
  border: 3px dashed var(--colour-primary);
  background: var(--colour-primary-light);
  color: var(--colour-primary);
  font-size: 1.25rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 0.75rem;
  z-index: 1000;
  pointer-events: none;
}

/* Empty state — centered prompt */
.empty {
  position: fixed;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-lg);
  padding: var(--space-lg);
}

.empty-card {
  width: 100%;
  max-width: 32rem;
  background: var(--colour-block-bg);
  border: 2px dashed var(--colour-border);
  border-radius: 0.75rem;
  padding: var(--space-2xl);
  text-align: center;
  cursor: pointer;
  color: var(--colour-text);
  font: inherit;
  transition: border-color 0.15s ease, background 0.15s ease, transform 0.15s ease;
}

.empty-card:hover,
.empty-card:focus-visible {
  border-color: var(--colour-primary);
  outline: none;
  transform: translateY(-1px);
}

.empty-icon {
  width: 3rem;
  height: 3rem;
  margin: 0 auto var(--space-lg);
  color: var(--colour-primary);
}

.empty-title {
  font-family: Georgia, "Times New Roman", Times, serif;
  font-weight: 700;
  font-size: 1.5rem;
  letter-spacing: -0.01em;
  margin-bottom: var(--space-sm);
}

.empty-text {
  color: var(--colour-text-secondary);
  font-size: 0.9375rem;
}

.empty-text kbd {
  display: inline-block;
  padding: 0.1em 0.4em;
  margin: 0 0.1em;
  font-family: ui-monospace, "SF Mono", "Cascadia Code", Menlo, Monaco, Consolas, monospace;
  font-size: 0.8125rem;
  background: var(--colour-bg-secondary);
  border: 1px solid var(--colour-border);
  border-radius: 0.25rem;
  color: var(--colour-text);
}

.empty-loading {
  display: none;
  color: var(--colour-text-secondary);
  font-size: 0.9375rem;
  animation: empty-pulse 1.4s ease-in-out infinite;
}

@keyframes empty-pulse {
  0%, 100% { opacity: 0.5; }
  50% { opacity: 1; }
}

.empty.loading .empty-text { display: none; }
.empty.loading .empty-loading { display: block; }
.empty.loading .empty-card { cursor: progress; }

/* Load-by-URL form — the primary path on mobile, where dropping a file or
   pasting XML is awkward. Fetches through the site's CORS proxy. */
.url-form {
  width: 100%;
  max-width: 32rem;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.url-label {
  font-size: 0.8125rem;
  color: var(--colour-text-secondary);
  text-align: center;
}

.url-row {
  display: flex;
  gap: var(--space-sm);
}

.url-input {
  flex: 1 1 auto;
  min-width: 0;
  padding: 0.55rem var(--space-md);
  font-size: 1rem;
  font-family: inherit;
  color: var(--colour-text);
  background: var(--colour-block-bg);
  border: 1px solid var(--colour-border);
  border-radius: 0.5rem;
  transition: border-color 0.15s ease;
}

.url-input::placeholder { color: var(--colour-text-secondary); }

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

.url-submit {
  flex: none;
  padding: 0.55rem var(--space-xl);
  font-size: 0.9375rem;
  font-weight: 600;
  font-family: inherit;
  color: #fff;
  background: var(--colour-primary);
  border: 1px solid var(--colour-primary);
  border-radius: 0.5rem;
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease;
}

.url-submit:hover {
  background: var(--colour-primary-hover);
  border-color: var(--colour-primary-hover);
}

.url-submit:focus-visible {
  outline: 2px solid var(--colour-primary);
  outline-offset: 2px;
}

.url-submit:disabled {
  opacity: 0.6;
  cursor: progress;
}

@media (prefers-color-scheme: dark) {
  .url-submit { color: #0a0a0a; }
}

/* Hide the form while a feed is loading to avoid a double submit. */
.empty.loading .url-form { display: none; }

.empty-error {
  max-width: 32rem;
  color: var(--colour-danger);
  font-size: 0.9375rem;
  text-align: center;
}

/* Toolbar */
.toolbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  padding: var(--space-md) var(--space-lg);
  background: color-mix(in srgb, var(--colour-bg) 85%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--colour-border);
}

.toolbar-meta {
  font-size: 0.875rem;
  color: var(--colour-text-secondary);
}

.toolbar-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: 0.4rem var(--space-md);
  font-size: 0.875rem;
  font-weight: 500;
  font-family: inherit;
  border: 1px solid var(--colour-border);
  background: var(--colour-block-bg);
  color: var(--colour-text);
  border-radius: 0.375rem;
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease;
}

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

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

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

@media (prefers-color-scheme: dark) {
  .btn-primary { color: #0a0a0a; }
}

/* Loaded layout */
.container {
  max-width: 60rem;
  margin-inline: auto;
  padding: var(--space-lg);
}

@media (min-width: 768px) {
  .container {
    padding: var(--space-2xl);
  }
}

.feed-header {
  margin-bottom: var(--space-xl);
  padding-bottom: var(--space-lg);
  border-bottom: 1px solid var(--colour-border);
}

.feed-header h1 {
  font-family: Georgia, "Times New Roman", Times, serif;
  font-size: clamp(1.5rem, 4vw, 2rem);
  line-height: 1.2;
  letter-spacing: -0.01em;
}

.feed-header h1 a {
  color: inherit;
  text-decoration: none;
}

.feed-header h1 a:hover {
  text-decoration: underline;
}

.feed-header .feed-desc {
  margin-top: var(--space-sm);
  color: var(--colour-text-secondary);
  font-size: 0.9375rem;
}

.feed-header .feed-link {
  display: inline-block;
  margin-top: var(--space-sm);
  font-size: 0.8125rem;
  color: var(--colour-primary);
  word-break: break-all;
}

/* Items */
.items {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.item {
  background: var(--colour-block-bg);
  border: 1px solid var(--colour-block-border);
  border-radius: 0.5rem;
  overflow: hidden;
}

.item[open] {
  border-color: var(--colour-primary);
}

.item > summary {
  list-style: none;
  cursor: pointer;
  padding: var(--space-md) var(--space-lg);
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
  user-select: none;
}

.item > summary::-webkit-details-marker {
  display: none;
}

.item > summary:hover {
  background: var(--colour-bg-secondary);
}

.item > summary:focus-visible {
  outline: 2px solid var(--colour-primary);
  outline-offset: -2px;
}

.summary-chevron {
  flex: none;
  width: 1.25rem;
  height: 1.25rem;
  margin-top: 0.15rem;
  color: var(--colour-text-secondary);
  transition: transform 0.15s ease;
}

.item[open] .summary-chevron {
  transform: rotate(90deg);
}

.summary-main {
  flex: 1 1 auto;
  min-width: 0;
}

.summary-title {
  font-weight: 600;
  font-size: 1.0625rem;
  line-height: 1.35;
}

.summary-sub {
  margin-top: 0.15rem;
  font-size: 0.8125rem;
  color: var(--colour-text-secondary);
  display: flex;
  flex-wrap: wrap;
  gap: 0.15rem var(--space-md);
}

.item-body {
  padding: 0 var(--space-lg) var(--space-lg);
  border-top: 1px solid var(--colour-border);
}

.item-body-inner {
  padding-top: var(--space-lg);
}

.item-actions {
  margin-top: var(--space-lg);
  padding-top: var(--space-md);
  border-top: 1px dashed var(--colour-border);
}

.item-actions a {
  font-size: 0.875rem;
  color: var(--colour-primary);
}

/* Rendered article body */
.content {
  overflow-wrap: break-word;
}

.content > :first-child { margin-top: 0; }
.content > :last-child { margin-bottom: 0; }

.content h1, .content h2, .content h3,
.content h4, .content h5, .content h6 {
  font-family: Georgia, "Times New Roman", Times, serif;
  font-weight: 700;
  line-height: 1.25;
  margin: 1.4em 0 0.5em;
}

.content h1 { font-size: 1.6rem; }
.content h2 { font-size: 1.35rem; }
.content h3 { font-size: 1.15rem; }

.content p { margin: 0 0 1em; }

.content a {
  color: var(--colour-primary);
  text-decoration: underline;
}

.content a:hover { color: var(--colour-primary-hover); }

.content ul, .content ol {
  margin: 0 0 1em;
  padding-left: 1.5em;
}

.content li { margin-bottom: 0.25em; }

.content blockquote {
  margin: 1em 0;
  padding: 0.5em var(--space-lg);
  border-left: 4px solid var(--colour-border);
  color: var(--colour-text-secondary);
  font-style: italic;
}

.content hr {
  margin: 1.5em 0;
  border: none;
  border-top: 1px solid var(--colour-border);
}

.content img,
.content video,
.content iframe {
  max-width: 100%;
  height: auto;
  border-radius: 0.375rem;
  margin: 0.75em 0;
}

.content figure { margin: 1em 0; }

.content figcaption {
  font-size: 0.8125rem;
  color: var(--colour-text-secondary);
  text-align: center;
  margin-top: 0.35em;
}

.content pre {
  margin: 1em 0;
  padding: var(--space-lg);
  background: var(--colour-bg-secondary);
  border: 1px solid var(--colour-block-border);
  border-radius: 0.5rem;
  overflow-x: auto;
  font-size: 0.875rem;
}

.content code {
  font-family: ui-monospace, "SF Mono", "Cascadia Code", Menlo, Monaco, Consolas, monospace;
  font-size: 0.875em;
  padding: 0.15em 0.35em;
  background: var(--colour-bg-secondary);
  border-radius: 0.25rem;
}

.content pre code {
  padding: 0;
  background: transparent;
  font-size: inherit;
}

.content table {
  width: 100%;
  margin: 1em 0;
  border-collapse: collapse;
  font-size: 0.9375rem;
}

.content th, .content td {
  padding: var(--space-sm) var(--space-md);
  border: 1px solid var(--colour-border);
  text-align: left;
  vertical-align: top;
}

.content th {
  background: var(--colour-bg-secondary);
  font-weight: 600;
}

.content-empty {
  color: var(--colour-text-secondary);
  font-style: italic;
}

/* Mobile-first tweaks */
@media (max-width: 480px) {
  .toolbar {
    flex-direction: column;
    align-items: stretch;
  }

  .toolbar-actions .btn {
    flex: 1 1 auto;
    justify-content: center;
  }
}