/* ==========================================================================
   Google-Style Design System for Exa Search Engine
   ========================================================================== */

:root {
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --bg-primary: #ffffff;
  --bg-secondary: #f8f9fa;
  --bg-card: #ffffff;
  --border-color: #dfe1e5;
  --border-hover: #c4c7c5;
  --text-main: #202124;
  --text-secondary: #4d5156;
  --text-muted: #70757a;
  --link-color: #1a0dab;
  --link-visited: #609;
  --accent-blue: #1a73e8;
  --accent-blue-hover: #1765cc;
  --shadow-sm: 0 1px 3px rgba(60,64,67,0.3);
  --shadow-hover: 0 1px 6px rgba(32,33,36,0.28);
  --shadow-focus: 0 2px 8px rgba(32,33,36,0.2);
  --drawer-width: 680px;
}

body.dark-theme {
  --bg-primary: #202124;
  --bg-secondary: #303134;
  --bg-card: #282a2d;
  --border-color: #3c4043;
  --border-hover: #5f6368;
  --text-main: #e8eaed;
  --text-secondary: #bdc1c6;
  --text-muted: #9aa0a6;
  --link-color: #8ab4f8;
  --link-visited: #c58af9;
  --accent-blue: #8ab4f8;
  --accent-blue-hover: #aecbfa;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.5);
  --shadow-hover: 0 1px 6px rgba(0,0,0,0.6);
  --shadow-focus: 0 2px 8px rgba(0,0,0,0.7);
}

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

body {
  font-family: var(--font-family);
  background-color: var(--bg-primary);
  color: var(--text-main);
  line-height: 1.58;
  font-size: 14px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background-color 0.2s ease, color 0.2s ease;
  overflow-x: hidden;
}

/* Utilities */
.hide { display: none !important; }
.c-blue { color: #4285F4; }
.c-red { color: #EA4335; }
.c-yellow { color: #FBBC05; }
.c-green { color: #34A853; }

/* Top Navigation Bar */
.top-nav {
  height: 60px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 24px;
  position: relative;
  z-index: 10;
}

.engine-badge {
  font-size: 12px;
  font-weight: 500;
  color: var(--accent-blue);
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  padding: 4px 10px;
  border-radius: 12px;
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 16px;
}

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 13px;
}
.nav-link:hover {
  text-decoration: underline;
  color: var(--text-main);
}

.icon-btn {
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  border-radius: 50%;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background-color 0.15s, color 0.15s;
}
.icon-btn:hover {
  background-color: var(--bg-secondary);
  color: var(--text-main);
}
.icon {
  width: 20px;
  height: 20px;
}

/* ==========================================================================
   Home View (Centered Google Style)
   ========================================================================== */
.home-view {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 20px;
  margin-top: -60px; /* Offset top nav */
}

.home-container {
  width: 100%;
  max-width: 640px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.logo-wrapper {
  margin-bottom: 28px;
  user-select: none;
}

.logo-title {
  font-size: 72px;
  font-weight: 500;
  letter-spacing: -2px;
  line-height: 1;
  margin-bottom: 12px;
}

.logo-search {
  font-size: 58px;
  font-weight: 400;
  letter-spacing: -1px;
}

.logo-subtitle {
  font-size: 14px;
  color: var(--text-muted);
  letter-spacing: 0.5px;
}

/* Search Box (Google Pill) */
.search-box-container {
  width: 100%;
}

.search-box {
  display: flex;
  align-items: center;
  width: 100%;
  height: 48px;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 24px;
  padding: 0 16px;
  transition: box-shadow 0.2s ease, border-color 0.2s ease;
  box-shadow: none;
}

.search-box:hover {
  box-shadow: var(--shadow-hover);
  border-color: transparent;
}

.search-box:focus-within {
  box-shadow: var(--shadow-focus);
  border-color: transparent;
}

.search-icon-left {
  display: flex;
  align-items: center;
  color: var(--text-muted);
  margin-right: 12px;
}
.search-icon-left svg {
  width: 18px;
  height: 18px;
}

.search-input {
  flex: 1;
  border: none;
  outline: none;
  background: transparent;
  font-size: 16px;
  color: var(--text-main);
  height: 100%;
  font-family: inherit;
}

.clear-btn {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-muted);
  padding: 4px;
  display: flex;
  align-items: center;
  border-radius: 50%;
}
.clear-btn:hover {
  color: var(--text-main);
}
.clear-btn svg {
  width: 16px;
  height: 16px;
}

.shortcut-tip {
  margin-left: 8px;
  font-size: 11px;
  padding: 2px 6px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  color: var(--text-muted);
  font-family: monospace;
  user-select: none;
}

/* Buttons under home search */
.home-buttons {
  margin-top: 24px;
  display: flex;
  gap: 12px;
  justify-content: center;
}

.btn {
  border: 1px solid transparent;
  border-radius: 4px;
  padding: 8px 16px;
  font-size: 14px;
  font-family: inherit;
  cursor: pointer;
  transition: background-color 0.15s, border-color 0.15s, box-shadow 0.15s;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  font-weight: 400;
}

.btn-primary {
  background-color: var(--bg-secondary);
  color: var(--text-main);
  border-color: var(--bg-secondary);
}
.btn-primary:hover {
  border-color: var(--border-hover);
  box-shadow: 0 1px 1px rgba(0,0,0,0.1);
  color: var(--text-main);
}

.btn-secondary {
  background-color: var(--bg-secondary);
  color: var(--text-main);
  border-color: var(--bg-secondary);
}
.btn-secondary:hover {
  border-color: var(--border-hover);
  box-shadow: 0 1px 1px rgba(0,0,0,0.1);
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  border-color: var(--border-color);
}
.btn-ghost:hover {
  background: var(--bg-secondary);
  color: var(--text-main);
}

.btn-sm {
  padding: 4px 10px;
  font-size: 12px;
  border-radius: 4px;
}

.syntax-guide-pill {
  margin-top: 20px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 12px;
  color: var(--text-secondary);
  max-width: 90%;
  line-height: 1.4;
}
.syntax-guide-pill code {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: Consolas, monospace;
  color: var(--accent-blue);
}
.syntax-tag {
  font-weight: 600;
  color: var(--text-main);
}

/* Quick Tags */
.quick-tags {
  margin-top: 36px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.quick-tag-label {
  font-size: 13px;
  color: var(--text-muted);
}

.quick-tag {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 4px 12px;
  border-radius: 16px;
  font-size: 12px;
  cursor: pointer;
  transition: all 0.15s;
}
.quick-tag:hover {
  background: var(--border-color);
  color: var(--text-main);
  border-color: var(--border-hover);
}

/* ==========================================================================
   Results View (Google Search Engine Results Page)
   ========================================================================== */
.results-view {
  flex: 1;
  display: flex;
  flex-direction: column;
}

.results-header {
  border-bottom: 1px solid var(--border-color);
  background: var(--bg-primary);
  position: sticky;
  top: 0;
  z-index: 100;
  padding: 12px 24px 0 24px;
}

.results-header-top {
  display: flex;
  align-items: center;
  gap: 24px;
}

.results-logo {
  font-size: 32px;
  font-weight: 500;
  text-decoration: none;
  letter-spacing: -1px;
  line-height: 1;
}

.results-search-box {
  max-width: 692px;
  height: 44px;
  box-shadow: var(--shadow-sm);
  border-color: transparent;
}
.results-search-box:hover,
.results-search-box:focus-within {
  box-shadow: var(--shadow-hover);
}

.search-submit-btn {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--accent-blue);
  padding: 6px;
  display: flex;
  align-items: center;
  border-radius: 50%;
}
.search-submit-btn:hover {
  background-color: var(--bg-secondary);
}
.search-submit-btn svg {
  width: 18px;
  height: 18px;
}

/* Category Filter Tabs */
.category-tabs {
  display: flex;
  gap: 20px;
  margin-top: 14px;
  padding-left: 92px;
  overflow-x: auto;
}

.tab-item {
  background: none;
  border: none;
  padding: 8px 4px 10px 4px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-muted);
  cursor: pointer;
  position: relative;
  white-space: nowrap;
  transition: color 0.15s;
}
.tab-item:hover {
  color: var(--text-main);
}
.tab-item.active {
  color: var(--accent-blue);
}
.tab-item.active::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 3px;
  background-color: var(--accent-blue);
  border-radius: 3px 3px 0 0;
}

/* Results Content Wrapper */
.results-content-wrapper {
  padding: 12px 24px 60px 116px;
  max-width: 820px;
}

.search-stats {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 20px;
  user-select: none;
}

/* Rate Limit / Alert Banner */
.alert-banner {
  background: #fef7e0;
  border: 1px solid #f9ab00;
  border-radius: 8px;
  padding: 16px;
  margin-bottom: 24px;
  display: flex;
  gap: 14px;
  align-items: flex-start;
  color: #3c4043;
}
body.dark-theme .alert-banner {
  background: #3c2f15;
  border-color: #855d08;
  color: #fce8b2;
}

.alert-icon {
  font-size: 20px;
}
.alert-text {
  flex: 1;
  font-size: 13px;
  line-height: 1.5;
}
.rate-limit-inline-input {
  margin-top: 10px;
  display: flex;
  gap: 8px;
  align-items: center;
  flex-wrap: wrap;
}
.rate-limit-inline-input input {
  flex: 1;
  min-width: 240px;
  padding: 6px 10px;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  font-size: 13px;
  background: var(--bg-primary);
  color: var(--text-main);
}
.link-external {
  color: var(--accent-blue);
  font-size: 12px;
  text-decoration: none;
}
.link-external:hover {
  text-decoration: underline;
}

/* Results List Items */
.results-list {
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.result-card {
  display: flex;
  flex-direction: column;
  position: relative;
}

/* Site breadcrumb */
.result-site-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 4px;
  font-size: 12px;
  color: var(--text-secondary);
}

.result-favicon {
  width: 16px;
  height: 16px;
  border-radius: 4px;
  background: #e0e0e0;
  object-fit: cover;
}

.result-domain-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.site-name {
  font-weight: 500;
  color: var(--text-main);
}
.site-url {
  color: var(--text-muted);
  font-size: 11px;
  max-width: 480px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Result Title */
.result-title-link {
  font-size: 19px;
  line-height: 1.34;
  color: var(--link-color);
  text-decoration: none;
  font-weight: 400;
  margin-bottom: 6px;
}
.result-title-link:hover {
  text-decoration: underline;
}
.result-title-link:visited {
  color: var(--link-visited);
}

/* Meta badge (date / author) */
.result-meta-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 4px;
}

/* Snippet / Highlights */
.result-snippet {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.58;
  word-break: break-word;
}
.result-snippet mark {
  background-color: transparent;
  font-weight: 600;
  color: var(--text-main);
}

/* Result Actions */
.result-actions {
  display: flex;
  gap: 12px;
  margin-top: 10px;
  align-items: center;
}

.action-btn {
  font-size: 12px;
  padding: 4px 10px;
  border-radius: 14px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  text-decoration: none;
  transition: all 0.15s;
}
.action-btn:hover {
  background: var(--border-color);
  color: var(--text-main);
  border-color: var(--border-hover);
}

.action-btn.reader-btn {
  color: var(--accent-blue);
  border-color: var(--accent-blue);
  background: transparent;
}
.action-btn.reader-btn:hover {
  background: var(--accent-blue);
  color: #ffffff;
}

/* Loading Skeletons */
.loading-container {
  display: flex;
  flex-direction: column;
  gap: 28px;
}
.skeleton-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.skeleton-line {
  height: 14px;
  background: linear-gradient(90deg, var(--bg-secondary) 25%, var(--border-color) 50%, var(--bg-secondary) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: 4px;
}
.skeleton-line.sm { width: 140px; height: 12px; }
.skeleton-line.md { width: 420px; height: 18px; margin: 4px 0; }
.skeleton-line.lg { width: 100%; }

@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* Empty State */
.empty-state {
  padding: 60px 0;
  text-align: center;
}
.empty-icon { font-size: 48px; margin-bottom: 12px; }
.empty-title { font-size: 18px; font-weight: 500; margin-bottom: 6px; }
.empty-desc { color: var(--text-muted); font-size: 14px; }

/* ==========================================================================
   Article Reader Drawer (web_fetch_exa)
   ========================================================================== */
.reader-drawer {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: var(--drawer-width);
  max-width: 90vw;
  background: var(--bg-primary);
  border-left: 1px solid var(--border-color);
  box-shadow: -4px 0 24px rgba(0,0,0,0.15);
  z-index: 1000;
  display: flex;
  flex-direction: column;
  transform: translateX(0);
  transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

.reader-header {
  height: 56px;
  border-bottom: 1px solid var(--border-color);
  padding: 0 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-secondary);
}

.reader-header-left {
  display: flex;
  align-items: center;
  gap: 10px;
}

.reader-badge {
  font-size: 12px;
  font-weight: 600;
  color: var(--accent-blue);
}
.reader-elapsed {
  font-size: 11px;
  color: var(--text-muted);
}

.reader-header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.reader-content {
  flex: 1;
  overflow-y: auto;
  padding: 28px 32px;
}

.reader-loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 300px;
  gap: 16px;
  color: var(--text-muted);
}

.spinner {
  width: 32px;
  height: 32px;
  border: 3px solid var(--border-color);
  border-top-color: var(--accent-blue);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.reader-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.4);
  backdrop-filter: blur(2px);
  z-index: 999;
}

/* Markdown typography inside reader */
.markdown-body {
  font-size: 15px;
  line-height: 1.7;
  color: var(--text-main);
  word-wrap: break-word;
}
.markdown-body h1, .markdown-body h2, .markdown-body h3 {
  margin-top: 24px;
  margin-bottom: 12px;
  font-weight: 600;
  line-height: 1.3;
}
.markdown-body h1 { font-size: 24px; border-bottom: 1px solid var(--border-color); padding-bottom: 8px; }
.markdown-body h2 { font-size: 20px; }
.markdown-body h3 { font-size: 17px; }
.markdown-body p { margin-bottom: 16px; }
.markdown-body a { color: var(--accent-blue); }
.markdown-body code {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: Consolas, monospace;
  font-size: 13px;
}
.markdown-body pre {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  padding: 14px;
  border-radius: 8px;
  overflow-x: auto;
  margin-bottom: 16px;
}
.markdown-body blockquote {
  border-left: 4px solid var(--accent-blue);
  padding-left: 14px;
  color: var(--text-secondary);
  margin-bottom: 16px;
}
.markdown-body ul, .markdown-body ol {
  padding-left: 24px;
  margin-bottom: 16px;
}
.markdown-body li { margin-bottom: 6px; }

/* ==========================================================================
   Settings Modal
   ========================================================================== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2000;
}

.modal-card {
  width: 100%;
  max-width: 480px;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  box-shadow: 0 8px 30px rgba(0,0,0,0.2);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.modal-header {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.modal-header h2 {
  font-size: 18px;
  font-weight: 500;
}

.modal-body {
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.setting-item label {
  display: block;
  font-weight: 500;
  margin-bottom: 6px;
  font-size: 14px;
}
.setting-desc {
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 8px;
}
.setting-hint {
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 6px;
}
.setting-hint a {
  color: var(--accent-blue);
}

.input-field, .select-field {
  width: 100%;
  padding: 8px 12px;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  background: var(--bg-primary);
  color: var(--text-main);
  font-size: 14px;
  outline: none;
}
.input-field:focus, .select-field:focus {
  border-color: var(--accent-blue);
}

.status-indicator {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  color: var(--text-secondary);
}
.dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
}
.dot.green { background: #34A853; }

.modal-footer {
  padding: 12px 20px;
  border-top: 1px solid var(--border-color);
  background: var(--bg-secondary);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* Toast */
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--text-main);
  color: var(--bg-primary);
  padding: 10px 20px;
  border-radius: 20px;
  font-size: 13px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.25);
  z-index: 3000;
  animation: fadeIn 0.2s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translate(-50%, 10px); }
  to { opacity: 1; transform: translate(-50%, 0); }
}

/* Responsive */
@media (max-width: 768px) {
  .category-tabs {
    padding-left: 0;
  }
  .results-content-wrapper {
    padding-left: 20px;
    padding-right: 20px;
  }
  .results-header-top {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }
  .results-search-box {
    width: 100%;
  }
  .logo-title {
    font-size: 54px;
  }
  .logo-search {
    font-size: 44px;
  }
}

/* ==========================================================================
   Google Style Pagination
   ========================================================================== */
.pagination-wrapper {
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  user-select: none;
}

.google-logo-pagination {
  display: flex;
  align-items: flex-end;
  font-size: 28px;
  font-weight: 500;
  letter-spacing: 2px;
}

.pagination-controls {
  display: flex;
  align-items: center;
  gap: 8px;
}

.page-btn {
  min-width: 36px;
  height: 36px;
  padding: 0 8px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  font-size: 13px;
  color: var(--accent-blue);
  text-decoration: none;
  background: transparent;
  border: none;
  cursor: pointer;
  transition: background-color 0.15s;
}

.page-btn:hover:not(:disabled) {
  background-color: var(--bg-secondary);
  text-decoration: underline;
}

.page-btn.active {
  font-weight: bold;
  color: var(--text-main);
  background-color: var(--bg-secondary);
  cursor: default;
  text-decoration: none;
}

.page-btn:disabled {
  color: var(--text-muted);
  cursor: not-allowed;
  opacity: 0.5;
}

.page-nav-btn {
  border-radius: 18px;
  padding: 6px 14px;
  font-size: 13px;
  color: var(--accent-blue);
  background: transparent;
  border: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.page-nav-btn:hover:not(:disabled) {
  text-decoration: underline;
  background-color: var(--bg-secondary);
}
.page-nav-btn:disabled {
  color: var(--text-muted);
  cursor: not-allowed;
  opacity: 0.4;
}