:root {
  --color-white: #ffffff;
  --color-ink: #1a1a1a;
  --color-paper: #fafaf7;
  --color-paper-2: #f3f1ea;
  --color-rule: #d9d6cd;
  --color-accent: #b14b3a;
  --color-muted: #6b6b6b;
  --color-badge-bg: rgba(255, 255, 255, 0.6);
  --color-card-bg: rgba(255, 255, 255, 0.45);
  
  --font-sans: ui-sans-serif, system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-serif: "Source Serif Pro", "Iowan Old Style", "Apple Garamond", Georgia, "Noto Serif SC", "Songti SC", serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;

  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
}

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

html {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body {
  background: var(--color-paper);
  color: var(--color-ink);
  font-family: var(--font-sans);
  line-height: 1.75;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color 0.15s ease, border-color 0.15s ease;
}

a:hover {
  color: var(--color-accent);
}

/* Header */
.site-header {
  border-bottom: 1px solid var(--color-rule);
  background: var(--color-paper);
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(8px);
}

.header-container {
  max-width: 56rem; /* 896px 对齐 zhanglu.net max-w-4xl */
  margin: 0 auto;
  padding: 1.25rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--color-ink);
  text-decoration: none;
}

.brand img {
  width: 1.5rem;
  height: 1.5rem;
}

.brand-dot {
  color: var(--color-accent);
}

.brand-sub {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-muted);
  font-weight: 400;
  margin-left: 0.25rem;
}

.header-nav {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  font-size: 0.875rem;
  overflow-x: auto;
  white-space: nowrap;
}

.nav-link {
  color: var(--color-muted);
  transition: color 0.15s ease;
}

.nav-link:hover {
  color: var(--color-ink);
  text-decoration: none;
}

.nav-link.active {
  color: var(--color-ink);
  font-weight: 500;
}

.nav-pill {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-rule);
  color: var(--color-muted);
}

.nav-pill:hover {
  color: var(--color-ink);
  border-color: var(--color-ink);
  text-decoration: none;
}

/* Main Container */
.main-layout {
  max-width: 56rem;
  margin: 0 auto;
  padding: 2.5rem 1.5rem 4rem;
  flex: 1;
  width: 100%;
}

/* Page Intro / Editorial Header */
.page-intro {
  margin-bottom: 2rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--color-rule);
}

.page-title {
  font-family: var(--font-serif);
  font-size: 2rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.25;
  margin-bottom: 0.75rem;
  color: var(--color-ink);
}

.page-desc {
  color: var(--color-muted);
  font-size: 0.95rem;
  line-height: 1.6;
  margin-bottom: 1rem;
}

.badge-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-muted);
}

.meta-badge {
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm);
  background: var(--color-badge-bg);
  border: 1px solid var(--color-rule);
}

.meta-badge.shield {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

/* Controls Bar */
.control-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 2rem;
  padding: 0.85rem 1rem;
  background: var(--color-paper-2);
  border: 1px solid var(--color-rule);
  border-radius: var(--radius-md);
}

.date-selector-group {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--color-muted);
}

.date-select {
  background: var(--color-paper);
  color: var(--color-ink);
  border: 1px solid var(--color-rule);
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  outline: none;
}

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

.search-box {
  position: relative;
  min-width: 220px;
  flex: 1;
  max-width: 320px;
}

.search-input {
  width: 100%;
  background: var(--color-paper);
  border: 1px solid var(--color-rule);
  color: var(--color-ink);
  padding: 0.35rem 0.75rem 0.35rem 1.85rem;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  outline: none;
}

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

.search-icon {
  position: absolute;
  left: 0.6rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-muted);
  font-size: 0.8rem;
  pointer-events: none;
}

/* Stats Row */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 0.75rem;
  margin-bottom: 2.5rem;
}

.stat-card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-rule);
  border-radius: var(--radius-md);
  padding: 0.85rem 1rem;
  display: flex;
  flex-direction: column;
}

.stat-value {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--color-ink);
  line-height: 1.2;
}

.stat-label {
  font-size: 0.75rem;
  color: var(--color-muted);
  margin-top: 0.2rem;
}

/* Sections */
.section-block {
  margin-bottom: 3rem;
}

.section-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  border-bottom: 1px solid var(--color-rule);
  padding-bottom: 0.5rem;
  margin-bottom: 1.25rem;
}

.section-title {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 600;
  color: var(--color-ink);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.section-sub {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-muted);
}

/* Top Projects Cards */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 0.85rem;
}

.project-card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-rule);
  border-radius: var(--radius-md);
  padding: 1.1rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.project-card:hover {
  border-color: var(--color-ink);
  transform: translateY(-1px);
}

.project-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
}

.project-rank {
  color: var(--color-muted);
  font-weight: 600;
}

.project-stars {
  color: var(--color-accent);
}

.project-name {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 0.4rem;
  word-break: break-all;
}

.project-name a {
  color: var(--color-ink);
}

.project-name a:hover {
  color: var(--color-accent);
  text-decoration: underline;
}

.project-license {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  padding: 0.1rem 0.4rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-rule);
  background: var(--color-paper-2);
  color: var(--color-muted);
  margin-bottom: 0.6rem;
}

.project-comment {
  font-size: 0.85rem;
  color: var(--color-muted);
  line-height: 1.55;
}

/* Analysis Cards */
.analysis-cards {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.analysis-card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-rule);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  transition: border-color 0.2s ease;
}

.analysis-card:hover {
  border-color: var(--color-ink);
}

.analysis-title {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-ink);
  margin-bottom: 0.75rem;
}

.point-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.point-item {
  font-size: 0.875rem;
  color: var(--color-ink);
  line-height: 1.6;
  display: flex;
  gap: 0.6rem;
  align-items: flex-start;
}

.point-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--color-muted);
  background: var(--color-paper-2);
  border: 1px solid var(--color-rule);
  padding: 0.1rem 0.4rem;
  border-radius: var(--radius-sm);
  white-space: nowrap;
  margin-top: 0.15rem;
}

/* Keywords Block */
.keywords-box {
  background: var(--color-card-bg);
  border: 1px solid var(--color-rule);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.5rem;
  color: var(--color-ink);
  font-size: 0.92rem;
  line-height: 1.8;
}

.keywords-box strong {
  color: var(--color-accent);
}

/* Public Repo Recommendations */
.reco-container {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.reco-card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-rule);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  transition: border-color 0.2s ease;
}

.reco-card:hover {
  border-color: var(--color-accent);
}

.reco-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.75rem;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.reco-repo-link {
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-ink);
}

.reco-repo-link:hover {
  color: var(--color-accent);
}

.reco-tag {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-rule);
  color: var(--color-accent);
  background: var(--color-badge-bg);
}

.reco-body {
  font-size: 0.88rem;
  color: var(--color-muted);
  line-height: 1.65;
  white-space: pre-line;
}

/* Top Pick Card (Quote Style) */
.pick-card {
  border-left: 3px solid var(--color-accent);
  background: var(--color-paper-2);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 0.85rem 1.15rem;
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  margin-bottom: 0.6rem;
}

.pick-badge {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-accent);
  white-space: nowrap;
}

.pick-content {
  font-size: 0.875rem;
  color: var(--color-ink);
  line-height: 1.6;
}

/* Privacy Notice Callout */
.privacy-notice-callout {
  border: 1px dashed var(--color-rule);
  border-radius: var(--radius-md);
  padding: 1rem;
  text-align: center;
  font-size: 0.85rem;
  color: var(--color-muted);
  background: var(--color-paper-2);
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--color-rule);
  background: var(--color-paper);
  margin-top: auto;
}

.footer-container {
  max-width: 56rem;
  margin: 0 auto;
  padding: 2rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  font-size: 0.85rem;
  color: var(--color-muted);
}

@media (min-width: 640px) {
  .footer-container {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
}

.footer-links {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.footer-links a:hover {
  color: var(--color-ink);
}

/* 404 page */
.page-404 {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100vh;
  text-align: center;
}

.error-container {
  max-width: 28rem;
  padding: 2rem;
}

.error-title {
  font-family: var(--font-serif);
  font-size: 3rem;
  color: var(--color-accent);
  margin-bottom: 0.5rem;
}

.btn-editorial {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  border: 1px solid var(--color-ink);
  padding: 0.4rem 1rem;
  border-radius: var(--radius-sm);
  margin-top: 1.5rem;
  color: var(--color-ink);
}

.btn-editorial:hover {
  background: var(--color-ink);
  color: var(--color-paper);
  text-decoration: none;
}

@media (max-width: 640px) {
  .header-container {
    padding: 1rem;
  }
  .main-layout {
    padding: 1.5rem 1rem 3rem;
  }
  .control-bar {
    flex-direction: column;
    align-items: stretch;
  }
  .search-box {
    max-width: none;
  }
  .page-title {
    font-size: 1.6rem;
  }
}