:root {
  --color-bg: #fafafa;
  --color-fg: #1a1a1a;
  --color-muted: #666;
  --color-accent: #3454d1;
  --color-card-bg: #ffffff;
  --color-border: #e2e2e2;
  --font-sans: 'Be Vietnam Pro', system-ui, -apple-system, sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-fg);
  line-height: 1.6;
}

a { color: var(--color-accent); text-decoration: none; }
a:hover { text-decoration: underline; }

header.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--color-border);
  background: var(--color-card-bg);
  position: sticky;
  top: 0;
  z-index: 10;
}

header.site-header nav a {
  margin-right: 1rem;
  color: var(--color-fg);
  font-weight: 600;
}

#lang-toggle {
  border: 1px solid var(--color-border);
  background: var(--color-card-bg);
  border-radius: 999px;
  padding: 0.35rem 0.9rem;
  font-family: inherit;
  font-weight: 700;
  cursor: pointer;
}

main {
  max-width: 860px;
  margin: 0 auto;
  padding: 1.5rem;
}

body.list-page main {
  max-width: 1100px;
}

footer.site-footer {
  max-width: 860px;
  margin: 2rem auto;
  padding: 1rem 1.5rem;
  color: var(--color-muted);
  font-size: 0.9rem;
  border-top: 1px solid var(--color-border);
}

/* Language blocks: show only the block matching html[data-lang] */
html[data-lang="vi"] [data-lang-block="en"] { display: none; }
html[data-lang="en"] [data-lang-block="vi"] { display: none; }
html:not([data-lang]) [data-lang-block="en"] { display: none; }

@media (max-width: 600px) {
  header.site-header { flex-direction: column; align-items: flex-start; gap: 0.5rem; }
  main { padding: 1rem; }
  #results { grid-template-columns: 1fr; }
  #filter-chips { gap: 0.4rem; }
  .chip { font-size: 0.85rem; padding: 0.25rem 0.65rem; }
}

#search-input {
  width: 100%;
  padding: 0.6rem 0.9rem;
  font-size: 1rem;
  font-family: inherit;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  margin: 1rem 0 0.75rem;
}

#filter-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.chip {
  border: 1px solid var(--color-border);
  background: var(--color-card-bg);
  border-radius: 999px;
  padding: 0.3rem 0.8rem;
  font-family: inherit;
  font-size: 0.9rem;
  cursor: pointer;
}

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

#result-count {
  color: var(--color-muted);
  font-size: 0.9rem;
  margin-bottom: 1rem;
}

#results {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1rem;
}

.bias-card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: 10px;
  padding: 1rem;
}

.bias-card h3 {
  margin: 0 0 0.4rem;
  font-size: 1.05rem;
}

.bias-card p {
  margin: 0;
  color: var(--color-muted);
  font-size: 0.92rem;
}

.back-link {
  font-weight: 600;
  margin: 0 0 1rem;
}

#bias-detail h2 {
  margin-top: 1.5rem;
  font-size: 1.1rem;
}

.detail-desc {
  color: var(--color-fg);
}

.related-list {
  list-style: disc;
  padding-left: 1.2rem;
  margin: 0;
}

.related-list li {
  margin-bottom: 0.3rem;
}

.not-found {
  color: var(--color-muted);
}

.api-key-box, .scenario-box {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: 10px;
  padding: 1rem;
  margin-bottom: 1.5rem;
}

.api-key-box label, .scenario-box label {
  display: block;
  font-weight: 600;
  margin-bottom: 0.4rem;
}

#gemini-key, #scenario-input {
  width: 100%;
  padding: 0.5rem;
  font-family: inherit;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  margin-bottom: 0.6rem;
  box-sizing: border-box;
}

.api-key-box button, .scenario-box button {
  border: 1px solid var(--color-border);
  background: var(--color-accent);
  color: #fff;
  border-radius: 6px;
  padding: 0.4rem 0.9rem;
  font-family: inherit;
  cursor: pointer;
  margin-right: 0.5rem;
}

.api-key-box button:disabled, .scenario-box button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.key-notice {
  color: var(--color-muted);
  font-size: 0.85rem;
  margin-top: 0.6rem;
}

#chat-entries {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.chat-entry {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: 10px;
  padding: 1rem;
}

.chat-question {
  margin: 0 0 0.5rem;
}

.chat-answer {
  margin: 0;
  white-space: pre-wrap;
}

.chat-answer a {
  font-weight: 600;
}

.chat-loading {
  color: var(--color-muted);
  font-style: italic;
}

.chat-error {
  color: #b3261e;
}

.model-box {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: 10px;
  padding: 1rem;
  margin-bottom: 1.5rem;
}

.model-box label {
  display: block;
  font-weight: 600;
  margin-bottom: 0.4rem;
}

#gemini-model {
  width: 100%;
  padding: 0.5rem;
  font-family: inherit;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  box-sizing: border-box;
}

.crypto-fallback-notice {
  color: #9a6700;
  font-size: 0.85rem;
  margin-top: 0.6rem;
}

#clear-history-btn {
  border: 1px solid var(--color-border);
  background: var(--color-card-bg);
  border-radius: 6px;
  padding: 0.4rem 0.9rem;
  font-family: inherit;
  cursor: pointer;
  margin-bottom: 1rem;
}

.provider-box {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: 10px;
  padding: 1rem;
  margin-bottom: 1.5rem;
}

.provider-box label {
  display: block;
  font-weight: 600;
  margin-bottom: 0.4rem;
}

#provider-select {
  width: 100%;
  padding: 0.5rem;
  font-family: inherit;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  box-sizing: border-box;
}

.provider-cost-notice {
  color: var(--color-muted);
  font-size: 0.85rem;
  margin-top: 0.6rem;
}