:root {
  --bg: #0f1419;
  --card: #1a2028;
  --card-hover: #222a34;
  --border: #2a3441;
  --text: #e6edf3;
  --text-dim: #8b949e;
  --text-faint: #6e7681;
  --accent: #58a6ff;
  --tag-work: #ff7b72;
  --tag-industry: #ffa657;
  --tag-strategy: #79c0ff;
  --tag-work-bg: rgba(255, 123, 114, 0.12);
  --tag-industry-bg: rgba(255, 166, 87, 0.12);
  --tag-strategy-bg: rgba(121, 192, 255, 0.12);
  --callout-bg: rgba(121, 192, 255, 0.06);
  --callout-border: rgba(121, 192, 255, 0.25);
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #fafafa;
    --card: #ffffff;
    --card-hover: #f6f8fa;
    --border: #d0d7de;
    --text: #1f2328;
    --text-dim: #57606a;
    --text-faint: #8c959f;
    --accent: #0969da;
    --tag-work: #cf222e;
    --tag-industry: #bc4c00;
    --tag-strategy: #0969da;
    --tag-work-bg: rgba(207, 34, 46, 0.08);
    --tag-industry-bg: rgba(188, 76, 0, 0.08);
    --tag-strategy-bg: rgba(9, 105, 218, 0.08);
    --callout-bg: rgba(9, 105, 218, 0.04);
    --callout-border: rgba(9, 105, 218, 0.2);
  }
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; }

body {
  font-family: "PingFang TC", "Microsoft JhengHei", "Noto Sans TC",
               -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  padding: 32px 24px 80px;
  min-height: 100vh;
}

.container { max-width: 1400px; margin: 0 auto; }

/* ===== 日期導覽 ===== */
.date-nav {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 20px;
  padding: 10px 14px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  flex-wrap: wrap;
}

.date-nav .date-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 36px;
  height: 32px;
  padding: 0 10px;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 8px;
  font-size: 14px;
  font-family: inherit;
  cursor: pointer;
  text-decoration: none;
  transition: all 0.15s ease;
}

.date-nav .date-btn:hover:not(.disabled) {
  background: var(--card-hover);
  border-color: var(--accent);
  color: var(--accent);
}

.date-nav .date-btn.disabled {
  opacity: 0.35;
  cursor: not-allowed;
  pointer-events: none;
}

.date-nav .date-select {
  flex: 1;
  min-width: 160px;
  height: 32px;
  padding: 0 12px;
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 8px;
  font-size: 14px;
  font-family: inherit;
  font-weight: 600;
  cursor: pointer;
  outline: none;
}

.date-nav .date-select:focus { border-color: var(--accent); }

.date-nav .latest-btn {
  margin-left: auto;
  background: var(--tag-strategy-bg);
  border-color: var(--callout-border);
  color: var(--tag-strategy);
}

@media (max-width: 600px) {
  .date-nav .latest-btn { margin-left: 0; width: 100%; }
}

header {
  margin-bottom: 28px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border);
}

h1 {
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 8px;
  letter-spacing: -0.02em;
}

.meta-line {
  color: var(--text-dim);
  font-size: 14px;
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  align-items: center;
}

.meta-line .pill {
  background: var(--card);
  padding: 4px 10px;
  border-radius: 12px;
  border: 1px solid var(--border);
  font-size: 12px;
}

/* ===== 今日必看 ===== */
.must-read {
  background: linear-gradient(135deg, var(--tag-work-bg), transparent);
  border: 1px solid var(--tag-work-bg);
  border-radius: 12px;
  padding: 20px 24px;
  margin-bottom: 28px;
}

.must-read-title {
  font-size: 13px;
  font-weight: 700;
  color: var(--tag-work);
  letter-spacing: 0.1em;
  margin-bottom: 14px;
  text-transform: uppercase;
}

.must-read-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}

@media (max-width: 800px) {
  .must-read-grid { grid-template-columns: 1fr; }
}

.must-read-item {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px 16px;
  font-size: 14px;
  line-height: 1.5;
  display: flex;
  flex-direction: column;
  gap: 6px;
  transition: background 0.15s ease, transform 0.15s ease;
  cursor: pointer;
  text-decoration: none;
  color: inherit;
}

.must-read-item:hover {
  background: var(--card-hover);
  transform: translateY(-1px);
  border-color: var(--tag-work);
}

.must-read-item .num {
  font-size: 11px;
  color: var(--tag-work);
  font-weight: 700;
}

.must-read-item .must-title {
  font-weight: 600;
  color: var(--text);
}

.must-read-item .must-hint {
  font-size: 12px;
  color: var(--text-dim);
  line-height: 1.5;
}

/* ===== 篩選列 ===== */
.filters {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 24px;
  padding: 12px 16px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  position: sticky;
  top: 8px;
  z-index: 10;
  backdrop-filter: blur(8px);
}

.chip {
  font-family: inherit;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-dim);
  padding: 5px 12px;
  border-radius: 16px;
  font-size: 13px;
  cursor: pointer;
  transition: all 0.15s ease;
  white-space: nowrap;
}

.chip:hover {
  color: var(--text);
  border-color: var(--text-dim);
}

.chip.active {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
}

@media (prefers-color-scheme: dark) {
  .chip.active { background: var(--accent); color: #0f1419; }
}

.chip .chip-count {
  margin-left: 4px;
  opacity: 0.7;
  font-size: 11px;
}

.search-input {
  flex: 1;
  min-width: 180px;
  font-family: inherit;
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 6px 12px;
  border-radius: 16px;
  font-size: 13px;
  outline: none;
  transition: border-color 0.15s;
}

.search-input:focus { border-color: var(--accent); }

.legend {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  font-size: 11px;
  color: var(--text-faint);
  margin-left: auto;
}

@media (max-width: 700px) {
  .legend { width: 100%; margin-left: 0; margin-top: 4px; }
}

/* ===== 主體 ===== */
main {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

@media (max-width: 900px) {
  main { grid-template-columns: 1fr; gap: 24px; }
  body { padding: 24px 16px 60px; }
  h1 { font-size: 24px; }
}

section h2 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 20px;
  color: var(--text);
  display: flex;
  align-items: baseline;
  gap: 12px;
}

section h2 .count {
  font-size: 13px;
  color: var(--text-faint);
  font-weight: 400;
}

.news-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.news-list.empty::after {
  content: '這個篩選下沒有新聞';
  display: block;
  padding: 32px 16px;
  text-align: center;
  color: var(--text-faint);
  font-size: 13px;
  border: 1px dashed var(--border);
  border-radius: 8px;
}

article {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 18px 20px;
  transition: background 0.15s ease, border-color 0.15s ease;
  position: relative;
}

article[data-category="work"] {
  border-left: 3px solid var(--tag-work);
  padding-left: 18px;
}

article:hover {
  background: var(--card-hover);
  border-color: color-mix(in srgb, var(--accent) 30%, var(--border));
}

article[data-category="work"]:hover {
  border-color: var(--tag-work);
}

article.hidden { display: none; }

.tag {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 10px;
  margin-bottom: 8px;
  letter-spacing: 0.02em;
}

.tag-work { background: var(--tag-work-bg); color: var(--tag-work); }
.tag-industry { background: var(--tag-industry-bg); color: var(--tag-industry); }
.tag-strategy { background: var(--tag-strategy-bg); color: var(--tag-strategy); }

.title {
  font-size: 16px;
  font-weight: 600;
  line-height: 1.4;
  margin-bottom: 4px;
  color: var(--text);
}

article[data-category="work"] .title { font-size: 17px; }

.orig-title {
  font-size: 12px;
  color: var(--text-faint);
  line-height: 1.4;
  margin-bottom: 10px;
  font-style: italic;
}

.summary {
  font-size: 14px;
  color: var(--text-dim);
  line-height: 1.65;
  margin-bottom: 10px;
}

.impact {
  background: var(--callout-bg);
  border-left: 3px solid var(--callout-border);
  padding: 8px 12px;
  margin-bottom: 12px;
  border-radius: 0 6px 6px 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--text);
}

.impact-label {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.05em;
  margin-right: 6px;
}

.footer-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  color: var(--text-faint);
  flex-wrap: wrap;
}

.footer-meta .sep { opacity: 0.5; }

.footer-meta a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.15s ease;
}

.footer-meta a:hover { border-color: var(--accent); }

.copy-btn {
  margin-left: auto;
  font-family: inherit;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-dim);
  padding: 3px 10px;
  border-radius: 12px;
  font-size: 11px;
  cursor: pointer;
  transition: all 0.15s ease;
  white-space: nowrap;
}

.copy-btn:hover {
  color: var(--text);
  border-color: var(--accent);
  background: var(--card-hover);
}

.copy-btn.copied {
  color: #7ce38b;
  border-color: #7ce38b;
}

footer.page-footer {
  margin-top: 48px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  font-size: 12px;
  color: var(--text-faint);
  line-height: 1.7;
}

footer.page-footer code {
  background: var(--card);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 11px;
}

/* ===== Toast ===== */
.toast {
  position: fixed;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--text);
  color: var(--bg);
  padding: 10px 20px;
  border-radius: 20px;
  font-size: 13px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s, transform 0.2s;
  box-shadow: 0 4px 16px rgba(0,0,0,0.3);
  z-index: 100;
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}