/* OPC日报 - Dark theme optimized for Chinese reading */

:root {
  --bg: #1a1a2e;
  --bg-card: #16213e;
  --bg-code: #0f3460;
  --text: #e0e0e0;
  --text-muted: #8892a4;
  --accent: #e94560;
  --link: #53a8ff;
  --gold: #f0b90b;
  --blue: #53a8ff;
  --green: #00c853;
  --red: #e94560;
  --purple: #bb86fc;
  --border: #2a2a4a;
  --max-width: 720px;
}

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

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", "WenQuanYi Micro Hei", "Noto Sans CJK SC", "Helvetica Neue",
    Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.8;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1rem 1.25rem;
  padding-top: env(safe-area-inset-top, 1rem);
  padding-bottom: env(safe-area-inset-bottom, 1rem);
}

/* Header */
.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 0;
  margin-bottom: 1.5rem;
  border-bottom: 1px solid var(--border);
}

.site-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text);
  text-decoration: none;
}

.back-link {
  font-size: 0.875rem;
  color: var(--text-muted);
  text-decoration: none;
}

.back-link:hover {
  color: var(--link);
}

/* Signal List (Index) */
.signal-list h1 {
  font-size: 1.5rem;
  margin-bottom: 0.25rem;
}

.subtitle {
  color: var(--text-muted);
  margin-bottom: 2rem;
  font-size: 0.95rem;
}

.signal-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.25rem;
  margin-bottom: 0.5rem;
  background: var(--bg-card);
  border-radius: 8px;
  text-decoration: none;
  color: var(--text);
  transition: background 0.2s, transform 0.1s;
}

.signal-card:hover {
  background: var(--bg-code);
  transform: translateX(4px);
}

.signal-card:active {
  transform: scale(0.98);
}

.signal-date {
  font-size: 1rem;
  font-weight: 500;
}

.signal-arrow {
  color: var(--text-muted);
  font-size: 1.2rem;
}

.empty {
  text-align: center;
  color: var(--text-muted);
  padding: 3rem 0;
}

/* Latest section (homepage) */
.latest-section {
  margin-bottom: 3rem;
}

.latest-badge {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  padding: 0.25rem 0.75rem;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 600;
  margin-bottom: 1rem;
  letter-spacing: 0.05em;
}

.permalink-link {
  display: inline-block;
  margin-top: 1rem;
  color: var(--text-muted);
  font-size: 0.85rem;
  text-decoration: none;
  padding: 0.4rem 0.8rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  transition: all 0.2s;
}

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

/* Archive section */
.archive-section {
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 2px dashed var(--border);
}

.archive-toggle {
  cursor: pointer;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text);
  padding: 0.75rem 1rem;
  background: var(--bg-card);
  border-radius: 8px;
  list-style: none;
  user-select: none;
  transition: background 0.2s;
}

.archive-toggle::-webkit-details-marker { display: none; }

.archive-toggle::after {
  content: "▾";
  float: right;
  color: var(--text-muted);
  transition: transform 0.2s;
}

details[open] .archive-toggle::after {
  transform: rotate(180deg);
  display: inline-block;
}

.archive-toggle:hover {
  background: var(--bg-code);
}

.archive-list {
  margin-top: 1rem;
}

.archive-card {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  margin-bottom: 0.4rem;
  background: var(--bg-card);
  border-radius: 6px;
  text-decoration: none;
  color: var(--text);
  transition: background 0.2s, transform 0.1s;
}

.archive-card:hover {
  background: var(--bg-code);
  transform: translateX(4px);
}

.archive-date {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-family: "SF Mono", "JetBrains Mono", monospace;
  flex-shrink: 0;
}

.archive-title {
  flex: 1;
  font-size: 0.95rem;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* Signal Article */
.signal-article {
  padding-bottom: 3rem;
}

.signal-article h1 {
  font-size: 1.5rem;
  line-height: 1.4;
  margin-bottom: 1.5rem;
  padding-bottom: 0.75rem;
  border-bottom: 2px solid var(--accent);
}

.signal-article h2 {
  font-size: 1.25rem;
  margin-top: 2.5rem;
  margin-bottom: 1rem;
  padding: 0.5rem 0.75rem;
  border-radius: 4px;
  line-height: 1.5;
}

/* Category-specific h2 colors */
.signal-article h2:has(+ h3) {
  background: var(--bg-card);
}

.signal-article h3 {
  font-size: 1.1rem;
  margin-top: 1.5rem;
  margin-bottom: 0.75rem;
  color: var(--text);
  line-height: 1.5;
}

.signal-article p {
  margin-bottom: 1rem;
  text-align: justify;
}

.signal-article strong {
  color: #fff;
  font-weight: 600;
}

.signal-article a {
  color: var(--link);
  text-decoration: none;
  word-break: break-all;
}

.signal-article a:hover {
  text-decoration: underline;
}

.signal-article hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2rem 0;
}

.signal-article blockquote {
  border-left: 3px solid var(--accent);
  padding: 0.5rem 1rem;
  margin: 1rem 0;
  background: var(--bg-card);
  border-radius: 0 4px 4px 0;
  color: var(--text-muted);
}

.signal-article code {
  background: var(--bg-code);
  padding: 0.15rem 0.4rem;
  border-radius: 3px;
  font-size: 0.9em;
  font-family: "SF Mono", "Fira Code", "JetBrains Mono", Consolas, monospace;
}

.signal-article pre {
  background: var(--bg-code);
  padding: 1rem;
  border-radius: 6px;
  overflow-x: auto;
  margin: 1rem 0;
}

.signal-article pre code {
  background: none;
  padding: 0;
}

.signal-article ul, .signal-article ol {
  padding-left: 1.5rem;
  margin-bottom: 1rem;
}

.signal-article li {
  margin-bottom: 0.5rem;
}

/* Signal nav (prev/next) */
.signal-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 2.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}

.signal-nav a {
  color: var(--link);
  text-decoration: none;
  font-size: 0.9rem;
  padding: 0.4rem 0.8rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  transition: all 0.2s;
}

.signal-nav a:hover {
  border-color: var(--link);
  background: var(--bg-card);
}

.nav-disabled {
  color: var(--text-muted);
  font-size: 0.85rem;
  opacity: 0.5;
}

.nav-latest-badge {
  color: var(--gold);
  opacity: 1;
  font-weight: 600;
}

/* Footer */
.site-footer {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  text-align: center;
  color: var(--text-muted);
  font-size: 0.85rem;
}

.site-footer a {
  color: var(--text-muted);
  text-decoration: none;
}

.site-footer a:hover {
  color: var(--link);
}

/* Responsive */
@media (max-width: 480px) {
  html {
    font-size: 15px;
  }

  .container {
    padding: 0.75rem 1rem;
  }

  .signal-article h1 {
    font-size: 1.3rem;
  }

  .signal-article h2 {
    font-size: 1.15rem;
  }
}

/* Selection */
::selection {
  background: var(--accent);
  color: #fff;
}

/* Scrollbar */
::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: var(--bg);
}

::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 3px;
}