/* ============================================
   汪洋的Agent开发记录 — 样式表
   ============================================ */

/* --- Design Tokens --- */
:root {
  /* Palette */
  --color-bg: #fafaf9;
  --color-surface: #ffffff;
  --color-surface-hover: #f5f5f4;
  --color-border: #e7e5e4;
  --color-border-light: #f0efee;

  --color-text-primary: #1c1917;
  --color-text-secondary: #57534e;
  --color-text-tertiary: #a8a29e;
  --color-text-inverse: #fafaf9;

  --color-accent: #2563eb;
  --color-accent-hover: #1d4ed8;
  --color-accent-light: #eff6ff;
  --color-accent-subtle: #dbeafe;

  --color-hero-bg: #0f172a;
  --color-hero-text: #e2e8f0;

  --color-category: #7c3aed;
  --color-category-bg: #f5f3ff;

  /* Typography */
  --font-sans: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;

  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;
  --text-5xl: 3rem;

  --leading-tight: 1.25;
  --leading-normal: 1.6;
  --leading-relaxed: 1.75;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;
  --space-section: 5rem;

  /* Layout */
  --container-max: 1100px;
  --container-narrow: 780px;
  --container-padding: 1.5rem;

  /* Radii */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.06), 0 2px 4px -2px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.06), 0 4px 6px -4px rgba(0, 0, 0, 0.04);

  /* Transitions */
  --duration-fast: 150ms;
  --duration-normal: 250ms;
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--color-text-primary);
  background-color: var(--color-bg);
}

img {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
  text-decoration: none;
}

/* --- Container --- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

/* --- Header --- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border-light);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 3.5rem;
}

.site-logo {
  font-family: var(--font-mono);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-accent);
  letter-spacing: -0.04em;
  transition: opacity var(--duration-fast) var(--ease-out);
}

.site-logo:hover {
  opacity: 0.8;
}

.site-nav {
  display: flex;
  gap: var(--space-xl);
}

.nav-link {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: color var(--duration-fast) var(--ease-out);
  position: relative;
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-text-primary);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--color-accent);
  border-radius: 1px;
}

/* --- Hero --- */
.hero {
  position: relative;
  padding: var(--space-4xl) 0;
  background: var(--color-hero-bg);
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 50% at 50% 40%, rgba(37, 99, 235, 0.15), transparent),
    radial-gradient(ellipse 80% 60% at 80% 80%, rgba(124, 58, 237, 0.08), transparent);
  pointer-events: none;
}

.hero .container {
  position: relative;
  z-index: 1;
}

.hero-eyebrow {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: var(--space-lg);
}

.hero-title {
  font-size: var(--text-5xl);
  font-weight: 700;
  line-height: var(--leading-tight);
  color: #f1f5f9;
  letter-spacing: -0.03em;
  max-width: 700px;
}

.hero-highlight {
  color: var(--color-accent);
  position: relative;
}

.hero-desc {
  margin-top: var(--space-xl);
  font-size: var(--text-lg);
  line-height: var(--leading-relaxed);
  color: #94a3b8;
  max-width: 560px;
}

.hero-tags {
  margin-top: var(--space-2xl);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.tag {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.75rem;
  font-size: var(--text-xs);
  font-weight: 500;
  border-radius: 9999px;
  background: rgba(255, 255, 255, 0.08);
  color: #cbd5e1;
  border: 1px solid rgba(255, 255, 255, 0.08);
}

/* --- Section Shared --- */
.section-header {
  margin-bottom: var(--space-3xl);
}

.section-title {
  font-size: var(--text-3xl);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--color-text-primary);
}

.section-subtitle {
  margin-top: var(--space-sm);
  font-size: var(--text-base);
  color: var(--color-text-tertiary);
}

/* --- Articles --- */
.articles-section {
  padding: var(--space-section) 0;
}

.articles-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-lg);
}

.article-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  transition:
    border-color var(--duration-normal) var(--ease-out),
    box-shadow var(--duration-normal) var(--ease-out),
    transform var(--duration-normal) var(--ease-out);
}

.article-card:hover {
  border-color: var(--color-border);
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.article-meta {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-bottom: var(--space-md);
}

.article-meta time {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
}

.article-category {
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-category);
  background: var(--color-category-bg);
  padding: 0.125rem 0.625rem;
  border-radius: 9999px;
}

.article-title {
  font-size: var(--text-xl);
  font-weight: 600;
  line-height: var(--leading-tight);
  margin-bottom: var(--space-sm);
}

.article-title a {
  color: var(--color-text-primary);
  transition: color var(--duration-fast) var(--ease-out);
}

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

.article-excerpt {
  font-size: var(--text-sm);
  line-height: var(--leading-relaxed);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-lg);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
}

.tag-sm {
  font-size: 0.6875rem;
  padding: 0.125rem 0.5rem;
  background: var(--color-bg);
  color: var(--color-text-tertiary);
  border: 1px solid var(--color-border-light);
}

/* --- About --- */
.about-section {
  padding: var(--space-section) 0;
  background: var(--color-surface);
  border-top: 1px solid var(--color-border-light);
  border-bottom: 1px solid var(--color-border-light);
}

.about-card {
  display: flex;
  gap: var(--space-2xl);
  align-items: flex-start;
}

.about-avatar {
  flex-shrink: 0;
  width: 72px;
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-accent);
  background: var(--color-accent-subtle);
  border-radius: var(--radius-lg);
}

.about-content {
  flex: 1;
}

.about-title {
  font-size: var(--text-2xl);
  font-weight: 700;
  margin-bottom: var(--space-md);
  color: var(--color-text-primary);
}

.about-text {
  font-size: var(--text-base);
  line-height: var(--leading-relaxed);
  color: var(--color-text-secondary);
}

.about-contact {
  margin-top: var(--space-lg);
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
}

.contact-label {
  font-weight: 600;
  color: var(--color-text-primary);
}

/* --- Footer --- */
.site-footer {
  padding: var(--space-2xl) 0;
  background: var(--color-bg);
}

.footer-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
  text-align: center;
}

.footer-text {
  font-size: var(--text-sm);
  color: var(--color-text-tertiary);
}

.footer-icp {
  font-size: var(--text-sm);
}

.footer-icp a {
  color: var(--color-text-tertiary);
  transition: color var(--duration-fast) var(--ease-out);
}

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

/* ============================================
   Responsive
   ============================================ */

@media (max-width: 768px) {
  :root {
    --text-5xl: 2.25rem;
    --text-3xl: 1.75rem;
    --space-4xl: 3.5rem;
    --space-section: 3.5rem;
  }

  .articles-grid {
    grid-template-columns: 1fr;
  }

  .hero-desc br {
    display: none;
  }

  .about-card {
    flex-direction: column;
    gap: var(--space-lg);
    align-items: center;
    text-align: center;
  }

  .site-nav {
    gap: var(--space-lg);
  }
}

@media (max-width: 480px) {
  :root {
    --container-padding: 1rem;
    --text-5xl: 1.75rem;
    --space-4xl: 2.5rem;
    --space-section: 2.5rem;
  }

  .hero-tags {
    gap: 0.375rem;
  }

  .hero-desc {
    font-size: var(--text-base);
  }

  .article-card {
    padding: var(--space-lg);
  }
}