/* CSS Custom Properties */
:root {
  --color-bg: #1a1a1a;
  --color-text: #e0e0e0;
  --color-text-secondary: #a0a0a0;
  --color-link: #5eead4;
  --color-link-hover: #2dd4bf;
  --color-link-visited: #7c7c7c;
  --color-accent: #14b8a6;
  --color-border: #2a2a2a;
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 0.75rem;
  --max-width: 1200px;
}

/* Reset and Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: Verdana, Geneva, sans-serif;
  font-size: 14px;
  line-height: 1.5;
  color: var(--color-text);
  background: var(--color-bg);
  margin: 0;
  padding: 0;
}

/* Header */
header {
  background: var(--color-accent);
  padding: 0.25rem 0.5rem;
  margin-bottom: 0.5rem;
}

header h1 {
  font-size: 16px;
  font-weight: bold;
  margin: 0;
  color: #1a1a1a;
  display: inline;
}

header .subtitle {
  display: none;
}

/* Main Container - Simple List */
main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 0.5rem;
  background: var(--color-bg);
}

/* Loading State */
.loading {
  padding: 1rem;
  color: var(--color-text-secondary);
  text-align: center;
}

/* Feed Item List Style */
article.feed-item {
  padding: 0.375rem 0;
  border-bottom: 1px solid var(--color-border);
  line-height: 1.3;
}

article.feed-item:last-child {
  border-bottom: none;
}

/* Article Title and Link */
article.feed-item h2 {
  font-size: 15px;
  font-weight: normal;
  margin: 0 0 0.25rem 0;
  line-height: 1.4;
}

article.feed-item h2 a {
  color: var(--color-link);
  text-decoration: none;
}

article.feed-item h2 a:visited {
  color: var(--color-link-visited);
}

article.feed-item h2 a:hover {
  color: var(--color-link-hover);
  text-decoration: underline;
}

/* Meta Information */
.meta {
  font-size: 12px;
  color: var(--color-text-secondary);
  margin: 0;
}

.meta .source {
  color: var(--color-text-secondary);
}

.meta .source::after {
  content: " | ";
}

.meta time {
  color: var(--color-text-secondary);
}

.meta .comments {
  color: var(--color-text-secondary);
  text-decoration: none;
}

.meta .comments::before {
  content: " | ";
}

.meta .comments:hover {
  color: var(--color-link-hover);
  text-decoration: underline;
}

/* Description */
article.feed-item .description {
  font-size: 13px;
  color: var(--color-text-secondary);
  margin: 0.25rem 0 0 0;
  line-height: 1.4;
}

.description .expand-btn {
  background: none;
  border: none;
  color: var(--color-link);
  cursor: pointer;
  font-size: 12px;
  padding: 0;
  margin-left: 0.25rem;
  text-decoration: underline;
}

.description .expand-btn:hover {
  color: var(--color-link-hover);
}

.description.expanded .description-text {
  display: block;
}

/* Favicon */
article.feed-item h2 .favicon {
  display: inline-block;
  margin-right: 0.35rem;
  vertical-align: middle;
  opacity: 0.8;
}

/* Controls Wrapper */
.controls-wrapper {
  max-width: var(--max-width);
  margin: 0 auto 1rem;
  padding: 0 0.5rem;
}

/* Controls */
.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
  padding: 0.75rem;
  background: var(--color-border);
  border-radius: 4px;
  margin-bottom: 0.5rem;
}

#search-box {
  flex: 1;
  min-width: 200px;
  padding: 0.4rem 0.6rem;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 3px;
  color: var(--color-text);
  font-size: 13px;
  font-family: inherit;
}

#search-box:focus {
  outline: 2px solid var(--color-link);
  outline-offset: 0;
}

.control-group {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.control-group label {
  font-size: 12px;
  color: var(--color-text-secondary);
}

#sort-select {
  padding: 0.4rem 0.6rem;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 3px;
  color: var(--color-text);
  font-size: 13px;
  font-family: inherit;
  cursor: pointer;
}

#view-toggle,
#add-feed-toggle {
  padding: 0.4rem 0.8rem;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 3px;
  color: var(--color-text);
  font-size: 13px;
  font-family: inherit;
  cursor: pointer;
  transition: background 0.2s;
}

#view-toggle:hover,
#add-feed-toggle:hover {
  background: var(--color-bg);
  border-color: var(--color-link);
}

#add-feed-toggle {
  margin-left: auto;
  color: var(--color-link);
  font-weight: 500;
}

/* Source Filters */
.source-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  padding: 0.5rem;
  background: var(--color-border);
  border-radius: 4px;
}

.source-filter {
  padding: 0.3rem 0.6rem;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 3px;
  color: var(--color-text);
  font-size: 12px;
  cursor: pointer;
  transition: all 0.2s;
}

.source-filter:hover {
  border-color: var(--color-link);
}

.source-filter.active {
  background: var(--color-accent);
  color: #1a1a1a;
  border-color: var(--color-accent);
}

/* Add Feed Form */
.add-feed-form {
  display: flex;
  gap: 0.5rem;
  padding: 0.75rem;
  background: var(--color-border);
  border-radius: 4px;
  margin-top: 0.5rem;
}

.add-feed-form.hidden {
  display: none;
}

#feed-url-input {
  flex: 1;
  padding: 0.4rem 0.6rem;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 3px;
  color: var(--color-text);
  font-size: 13px;
  font-family: inherit;
}

#feed-url-input:focus {
  outline: 2px solid var(--color-link);
  outline-offset: 0;
}

#add-feed-btn,
#cancel-feed-btn {
  padding: 0.4rem 0.8rem;
  border: 1px solid var(--color-border);
  border-radius: 3px;
  font-size: 13px;
  font-family: inherit;
  cursor: pointer;
  transition: all 0.2s;
}

#add-feed-btn {
  background: var(--color-accent);
  color: #1a1a1a;
  border-color: var(--color-accent);
}

#add-feed-btn:hover {
  opacity: 0.9;
}

#cancel-feed-btn {
  background: var(--color-bg);
  color: var(--color-text);
}

#cancel-feed-btn:hover {
  border-color: var(--color-link);
}

/* Skeleton Loader */
.skeleton-loader {
  padding: 0.5rem 0;
}

.skeleton-item {
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--color-border);
  animation: pulse 1.5s ease-in-out infinite;
}

.skeleton-item::before {
  content: '';
  display: block;
  height: 18px;
  width: 70%;
  background: var(--color-border);
  border-radius: 3px;
  margin-bottom: 0.5rem;
}

.skeleton-item::after {
  content: '';
  display: block;
  height: 12px;
  width: 40%;
  background: var(--color-border);
  border-radius: 3px;
  opacity: 0.6;
}

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

/* Scroll to Top Button */
#scroll-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 48px;
  height: 48px;
  background: var(--color-accent);
  color: #1a1a1a;
  border: none;
  border-radius: 50%;
  font-size: 24px;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
  z-index: 1000;
}

#scroll-to-top.visible {
  opacity: 1;
  visibility: visible;
}

#scroll-to-top:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.4);
}

/* Compact View Mode */
body.compact-view article.feed-item {
  padding: 0.25rem 0;
}

body.compact-view article.feed-item h2 {
  font-size: 14px;
  margin: 0;
}

body.compact-view article.feed-item .meta {
  font-size: 11px;
}

body.compact-view article.feed-item .description {
  display: none;
}

/* Keyboard Navigation */
article.feed-item.kb-focused {
  background: rgba(94, 234, 212, 0.1);
  border-left: 3px solid var(--color-link);
  padding-left: 0.5rem;
  margin-left: -0.5rem;
}

/* Read State */
article.feed-item.read h2 a {
  opacity: 0.6;
}

article.feed-item.read {
  opacity: 0.7;
}

/* Filtered/Hidden Items */
article.feed-item.filtered {
  display: none;
}

/* Footer Enhancements */
#feed-status {
  margin-bottom: 0.5rem;
  font-size: 12px;
  color: var(--color-text-secondary);
}

.keyboard-hints {
  margin-top: 0.5rem;
  font-size: 11px;
  color: var(--color-text-secondary);
  opacity: 0.7;
}

/* Utility */
.hidden {
  display: none;
}

/* Footer */
footer {
  max-width: var(--max-width);
  margin: 1rem auto 0;
  padding: 1rem 0.5rem;
  text-align: center;
  color: var(--color-text-secondary);
  font-size: 11px;
  border-top: 1px solid var(--color-border);
}

/* Error State */
.error {
  background: #2a1a1a;
  border: 1px solid #dc2626;
  padding: 0.5rem;
  margin: 0.5rem 0;
  color: #fca5a5;
  font-size: 13px;
}

/* Accessibility - Focus Styles */
:focus-visible {
  outline: 2px solid var(--color-link);
  outline-offset: 2px;
}

/* Responsive adjustments */
@media (max-width: 768px) {
  body {
    font-size: 15px;
  }

  article.feed-item h2 {
    font-size: 16px;
  }

  .meta {
    font-size: 13px;
  }

  article.feed-item .description {
    font-size: 14px;
  }

  .controls {
    flex-direction: column;
    align-items: stretch;
  }

  #search-box {
    width: 100%;
  }

  .control-group {
    justify-content: space-between;
  }

  #add-feed-toggle {
    margin-left: 0;
  }

  #scroll-to-top {
    bottom: 1rem;
    right: 1rem;
    width: 44px;
    height: 44px;
    font-size: 20px;
  }

  .keyboard-hints {
    display: none;
  }
}

/* Print Styles */
@media print {
  :root {
    --color-bg: #ffffff;
    --color-text: #000000;
    --color-text-secondary: #666666;
    --color-link: #000000;
    --color-border: #cccccc;
  }

  body {
    background: white;
    color: black;
  }

  header {
    background: white;
    border-bottom: 2px solid #000;
    color: black;
  }

  header h1 {
    color: black;
  }

  article.feed-item {
    break-inside: avoid;
  }

  article.feed-item h2 a {
    color: black;
  }
}