/*
 * RefIntegrity — styles
 * Aesthetic: PubMed, Google Scholar, Nature.com
 * Principle: utilitarian, dense, typographically grounded
 */

:root {
  --navy: #205493;
  --navy-dark: #112e51;
  --navy-light: #4773aa;
  --red: #a93226;
  --red-bg: #fdf0ef;
  --green: #2e7d32;
  --green-bg: #edf7ee;
  --amber: #8a6d3b;
  --amber-bg: #fcf8e3;
  --text: #212121;
  --text-secondary: #5f6368;
  --border: #dadce0;
  --bg: #fff;
  --bg-alt: #f8f9fa;
  --surface: #f8f9fa;
  --muted: #5f6368;
  --font-serif: 'Source Serif 4', Georgia, 'Times New Roman', serif;
  --font-sans: 'Source Sans 3', 'Helvetica Neue', Helvetica, Arial, sans-serif;
  --font-mono: 'IBM Plex Mono', 'Menlo', 'Consolas', monospace;
  --content-width: 680px;
}

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

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
}

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

/* Header */
.site-header { border-bottom: 1px solid var(--border); }
.header-inner {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 12px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.logo {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--navy-dark);
  text-decoration: none;
}
.logo span { font-weight: 400; }
.site-header nav { display: flex; align-items: center; gap: 16px; }
.site-header nav a { font-size: 0.8125rem; color: var(--text-secondary); }
.nav-toggle {
  font-family: var(--font-sans); font-size: 0.8125rem;
  color: var(--text-secondary); background: none; border: none;
  cursor: pointer; padding: 0;
}
.nav-toggle:hover { color: var(--navy); }
.nav-toggle.active { color: var(--navy); }

/* Header panels */
.header-panel {
  overflow: hidden; border-top: 1px solid var(--border);
  max-height: 0; opacity: 0;
  transition: max-height 0.25s ease, opacity 0.2s ease;
}
.header-panel.open {
  max-height: 300px; opacity: 1;
}
.header-panel-inner {
  max-width: var(--content-width); margin: 0 auto;
  padding: 14px 20px;
}
.header-panel-inner ol {
  padding-left: 18px; font-size: 0.75rem;
  color: var(--text-secondary); line-height: 1.7;
}
.header-panel-inner ol li { margin-bottom: 2px; }
.header-panel-inner ol li strong { color: var(--text); }
.panel-note { font-size: 0.6875rem; color: var(--text-secondary); margin-top: 8px; }
.header-panel-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 20px;
}
.header-panel-inner h3 {
  font-family: var(--font-sans); font-size: 0.6875rem; font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.04em;
  color: var(--navy-dark); margin-bottom: 5px;
}
.header-panel-inner h3:not(:first-child) { margin-top: 10px; }
.header-panel-inner code {
  display: block; font-family: var(--font-mono); font-size: 0.6875rem;
  background: var(--bg-alt); padding: 5px 7px; border-radius: 3px;
  border: 1px solid var(--border); word-break: break-all; margin-bottom: 5px;
}
.header-panel-inner .code-inline {
  display: inline; padding: 1px 4px; border: none;
  background: var(--bg-alt); font-size: 0.625rem;
}
.header-panel-inner p {
  font-size: 0.75rem; line-height: 1.6; color: var(--text-secondary);
}
.header-panel-inner p strong { color: var(--text); font-weight: 500; }
.header-panel-inner a { color: var(--navy); text-decoration: underline; }

/* Main */
main {
  flex: 1;
  max-width: var(--content-width);
  width: 100%;
  margin: 0 auto;
  padding: 0 20px;
}

/* Page title */
.page-title {
  padding: 40px 0 20px;
  margin-bottom: 24px;
}
.page-title h1 {
  font-family: var(--font-serif);
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--navy-dark);
  line-height: 1.2;
  margin-bottom: 6px;
}
.page-title p {
  font-size: 0.9375rem;
  color: var(--text-secondary);
}

/* Search box */
.search-box { margin-bottom: 16px; }

/* Primary input row */
.input-row {
  display: flex;
  gap: 8px;
}

.input-row input {
  flex: 1;
  padding: 11px 14px;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  border: 1px solid var(--border);
  border-radius: 4px;
  outline: none;
  background: var(--bg);
  color: var(--text);
}
.input-row input:focus {
  border-color: var(--navy);
  box-shadow: 0 0 0 1px var(--navy);
}
.input-row input::placeholder {
  color: #9aa0a6;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
}

.input-row button {
  padding: 11px 24px;
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 600;
  color: #fff;
  background: var(--navy);
  border: 1px solid var(--navy);
  border-radius: 4px;
  cursor: pointer;
  white-space: nowrap;
}
.input-row button:hover { background: var(--navy-dark); border-color: var(--navy-dark); }
.input-row button:disabled { opacity: 0.5; cursor: default; }

/* Secondary links under input */
.input-secondary {
  margin-top: 8px;
  font-size: 0.8125rem;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}

.link-btn {
  font-family: var(--font-sans);
  font-size: 0.8125rem;
  color: var(--navy);
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}
.link-btn:hover { text-decoration: underline; }

.file-label { cursor: pointer; }

.secondary-sep { color: var(--border); }

.try-link { color: var(--text-secondary); }
.try-link .link-btn {
  font-family: var(--font-mono);
  font-size: 0.75rem;
}

/* Bulk section */
#bulk-section { margin-bottom: 16px; }

#bulk-input {
  width: 100%;
  padding: 9px 12px;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  border: 1px solid var(--border);
  border-radius: 4px;
  outline: none;
  background: var(--bg);
  color: var(--text);
  resize: vertical;
  line-height: 1.7;
}
#bulk-input:focus { border-color: var(--navy); box-shadow: 0 0 0 1px var(--navy); }

.bulk-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 10px;
}
.bulk-actions button {
  padding: 9px 20px;
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 600;
  color: #fff;
  background: var(--navy);
  border: 1px solid var(--navy);
  border-radius: 4px;
  cursor: pointer;
}
.bulk-actions button:hover { background: var(--navy-dark); }
.bulk-actions button:disabled { opacity: 0.5; cursor: default; }

.file-name {
  font-size: 0.75rem;
  color: var(--text-secondary);
  font-family: var(--font-mono);
}

/* History */
.history-section {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}
.history-label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.history-list { display: flex; flex-wrap: wrap; gap: 4px; }
.history-item {
  padding: 2px 8px;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--navy);
  background: none;
  border: 1px solid var(--border);
  border-radius: 3px;
  cursor: pointer;
}
.history-item:hover { background: var(--bg-alt); border-color: var(--navy-light); }
.history-toggle {
  padding: 2px 8px; font-family: var(--font-sans); font-size: 0.6875rem; font-weight: 600;
  color: var(--muted); background: none; border: 1px dashed var(--border); border-radius: 3px;
  cursor: pointer; line-height: inherit;
}
.history-toggle:hover { color: var(--navy); border-color: var(--navy-light); }

/* Loading */
.loading-section { text-align: center; padding: 32px 0; }
.loading-section p { font-size: 0.8125rem; color: var(--text-secondary); margin-top: 12px; }
.loading-bar {
  width: 200px; height: 2px; background: var(--border);
  margin: 0 auto; border-radius: 1px; overflow: hidden; position: relative;
}
.loading-bar::after {
  content: ''; position: absolute; top: 0; left: -40%; width: 40%; height: 100%;
  background: var(--navy); animation: slide 1.2s ease-in-out infinite;
}
@keyframes slide { 0% { left: -40%; } 100% { left: 100%; } }

/* Notices */
.notice { padding: 10px 14px; border-radius: 3px; font-size: 0.875rem; margin-bottom: 16px; }
.notice-error { background: var(--red-bg); border: 1px solid #e6b0aa; color: var(--red); }
.notice-warning { background: var(--amber-bg); border: 1px solid #d4c5a0; color: var(--amber); }

/* Result hero — the main takeaway */
.result-hero {
  padding: 16px 18px;
  border-radius: 4px;
  font-size: 0.9375rem;
  margin-bottom: 16px;
}
.result-hero strong { font-weight: 600; }
.result-hero-ok {
  background: var(--green-bg);
  border: 1px solid #a5d6a7;
  color: var(--green);
}
.result-hero-warn {
  background: var(--red-bg);
  border: 1px solid #e6b0aa;
  color: var(--red);
}
.result-hero-neutral {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  color: var(--text-secondary);
}

/* Results */
.result-title { margin-bottom: 12px; }
.result-title h2 {
  font-family: var(--font-serif);
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--text);
  line-height: 1.4;
}

.result-summary {
  display: flex; gap: 12px; align-items: baseline; flex-wrap: wrap;
  padding: 10px 0; border-top: 1px solid var(--border); border-bottom: 1px solid var(--border);
  margin-bottom: 16px; font-size: 0.875rem;
}
.stat { font-weight: 500; }
.stat.retracted, .stat.flagged { color: var(--red); font-weight: 600; }
.stat.clean { color: var(--green); }
.stat-sep { color: var(--border); }

/* Actions */
.result-actions { display: flex; align-items: center; gap: 8px; margin-bottom: 16px; }
.btn-text {
  font-family: var(--font-sans); font-size: 0.8125rem; color: var(--navy);
  background: none; border: none; cursor: pointer; padding: 0;
}
.btn-text:hover { text-decoration: underline; }
.separator { color: var(--border); font-size: 0.75rem; }
/* Search results (title disambiguation) */
.search-heading { font-size: 0.9375rem; color: var(--muted); margin-bottom: 12px; }
.search-item {
  display: block; width: 100%; text-align: left; background: var(--surface); border: 1px solid var(--border);
  border-radius: 8px; padding: 12px 16px; margin-bottom: 8px; cursor: pointer;
  font-family: var(--font-sans); transition: border-color 0.15s, box-shadow 0.15s;
}
.search-item:hover { border-color: var(--navy); box-shadow: 0 2px 8px rgba(0,0,0,0.06); }
.search-title { display: block; font-size: 0.9375rem; font-weight: 500; color: var(--navy); line-height: 1.4; }
.search-meta { display: block; font-size: 0.8125rem; color: var(--muted); margin-top: 4px; }
.badge-retracted {
  display: inline-block; font-size: 0.6875rem; font-weight: 600; padding: 1px 6px;
  border-radius: 3px; background: var(--red-bg, #fde8e8); color: var(--red, #b91c1c);
  vertical-align: middle; margin-left: 6px;
}

.result-disclaimer {
  font-size: 0.75rem; color: var(--muted); margin-top: 16px; padding-top: 12px;
  border-top: 1px solid var(--border); line-height: 1.5;
}
.result-disclaimer a { color: var(--muted); text-decoration: underline; }
.result-disclaimer a:hover { color: var(--navy); }

/* Reference cards */
.ref-card {
  padding: 12px 14px; border: 1px solid var(--border);
  border-radius: 3px; margin-bottom: 10px; background: var(--bg);
}
.ref-card.retracted { border-left: 3px solid var(--red); background: var(--red-bg); }
.ref-card.eoc { border-left: 3px solid #b45309; background: var(--amber-bg); }
.ref-card.withdrawn { border-left: 3px solid var(--text-secondary); background: var(--bg-alt); }

.ref-card h3 {
  font-family: var(--font-serif); font-size: 0.9375rem; font-weight: 600;
  line-height: 1.4; margin-bottom: 4px; color: var(--text);
}
.badge {
  display: inline-block; font-size: 0.625rem; font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.08em;
  padding: 2px 6px; border-radius: 2px; margin-bottom: 6px;
}
.badge-retracted { background: var(--red); color: #fff; }
.badge-eoc { background: #b45309; color: #fff; }
.badge-withdrawn { background: var(--text-secondary); color: #fff; }

.ref-meta {
  font-size: 0.8125rem; color: var(--text-secondary);
  display: flex; flex-wrap: wrap; gap: 6px; align-items: baseline;
}
.ref-meta code { font-family: var(--font-mono); font-size: 0.75rem; }
.ref-meta a { color: var(--navy); }
.ref-detail {
  font-size: 0.8125rem; color: var(--text-secondary);
  margin-top: 8px; padding-top: 8px; border-top: 1px solid #e6b0aa;
}
.ref-detail span { display: block; margin-bottom: 1px; }
.ref-detail a { color: var(--navy); }

/* Bulk results */
.section-heading { font-family: var(--font-serif); font-size: 1.125rem; font-weight: 600; margin-bottom: 12px; }
.bulk-table { width: 100%; border-collapse: collapse; font-size: 0.8125rem; border: 1px solid var(--border); }
.bulk-table th {
  background: var(--bg-alt); padding: 8px 10px; text-align: left;
  font-weight: 600; font-size: 0.6875rem; text-transform: uppercase;
  letter-spacing: 0.04em; color: var(--text-secondary); border-bottom: 1px solid var(--border);
}
.bulk-table td { padding: 8px 10px; border-bottom: 1px solid #f0f0f0; vertical-align: top; }
.bulk-table tr:last-child td { border-bottom: none; }
.bulk-table .doi-cell { font-family: var(--font-mono); font-size: 0.75rem; word-break: break-all; }
.bulk-table .status-ok { color: var(--green); }
.bulk-table .status-warn { color: var(--red); font-weight: 600; }
.bulk-table .status-err { color: var(--text-secondary); }

/* Footer */
footer { border-top: 1px solid var(--border); margin-top: 48px; }
.footer-inner {
  max-width: var(--content-width); margin: 0 auto; padding: 20px;
  font-size: 0.75rem; color: var(--text-secondary); line-height: 1.6;
}
.footer-inner p { margin: 0; line-height: 1.6; }
.footer-inner p + p { margin-top: 2px; }
.footer-inner a { color: var(--text-secondary); text-decoration: underline; }
.footer-inner a:hover { color: var(--navy); }
.last-updated { font-style: italic; }

/* AI agent optimization */
.answer-block { font-size: 0.9rem; color: var(--text-secondary); max-width: 520px; }

/* Toast */
.toast {
  position: fixed; bottom: 20px; left: 50%; transform: translateX(-50%);
  padding: 8px 16px; background: var(--navy-dark); color: #fff;
  border-radius: 3px; font-size: 0.8125rem; z-index: 100;
}

/* Language switcher — compact dropdown */
.lang-switcher { position: relative; }
.lang-switcher-btn {
  font-family: var(--font-sans); font-size: 0.8125rem;
  color: var(--text-secondary); background: none; border: 1px solid var(--border);
  border-radius: 3px; padding: 3px 8px; cursor: pointer; white-space: nowrap;
}
.lang-switcher-btn:hover { color: var(--navy); border-color: var(--navy-light); }
.lang-dropdown {
  display: none; position: absolute; top: 100%; right: 0; z-index: 50;
  margin-top: 4px; background: var(--bg); border: 1px solid var(--border);
  border-radius: 4px; box-shadow: 0 4px 12px rgba(0,0,0,0.1);
  min-width: 140px; max-height: 320px; overflow-y: auto;
}
.lang-dropdown.open { display: block; }
.lang-option {
  display: block; padding: 6px 12px; font-size: 0.8125rem;
  color: var(--text); text-decoration: none; white-space: nowrap;
}
.lang-option:hover { background: var(--bg-alt); text-decoration: none; }
.lang-active { color: var(--navy); font-weight: 600; background: var(--bg-alt); }

/* RTL support */
html[dir="rtl"] .header-inner { flex-direction: row-reverse; }
html[dir="rtl"] .site-header nav { flex-direction: row-reverse; }
html[dir="rtl"] .input-row { flex-direction: row-reverse; }
html[dir="rtl"] .input-secondary { flex-direction: row-reverse; }
html[dir="rtl"] .ref-card.retracted { border-left: none; border-right: 3px solid var(--red); }
html[dir="rtl"] .ref-card.eoc { border-left: none; border-right: 3px solid #b45309; }
html[dir="rtl"] .ref-card.withdrawn { border-left: none; border-right: 3px solid var(--text-secondary); }
html[dir="rtl"] .header-panel-inner ol { padding-left: 0; padding-right: 18px; }
html[dir="rtl"] .bulk-table th { text-align: right; }
html[dir="rtl"] .history-section { flex-direction: row-reverse; }
html[dir="rtl"] .ref-detail span { direction: rtl; }
html[dir="rtl"] .lang-dropdown { right: auto; left: 0; }

/* Responsive */
@media (max-width: 600px) {
  .page-title { padding: 28px 0 16px; }
  .page-title h1 { font-size: 1.5rem; }
  .input-row { flex-direction: column; }
  .input-row button { width: 100%; }
  .input-secondary { flex-direction: column; gap: 4px; }
  .secondary-sep { display: none; }
  .result-summary { flex-direction: column; gap: 2px; }
  .stat-sep { display: none; }
  .bulk-table { font-size: 0.75rem; }
  .header-panel-grid { grid-template-columns: 1fr; }
}