/* 静思笔记 — 备案用个人博客样式 */

:root {
  --color-bg: #faf9f7;
  --color-surface: #ffffff;
  --color-text: #1a1a1a;
  --color-text-muted: #5c5c5c;
  --color-accent: #2d6a4f;
  --color-accent-hover: #1b4332;
  --color-border: #e8e6e3;
  --color-hero-bg: #f0ede8;
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-serif: "Songti SC", "Noto Serif SC", Georgia, serif;
  --max-width: 1080px;
  --radius: 8px;
  --shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text);
  background: var(--color-bg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

main {
  flex: 1;
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color 0.2s;
}

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

img {
  max-width: 100%;
  height: auto;
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(250, 249, 247, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-text);
  letter-spacing: 0.02em;
}

.logo:hover {
  color: var(--color-accent);
}

.main-nav {
  display: flex;
  gap: 28px;
}

.main-nav a {
  color: var(--color-text-muted);
  font-size: 0.95rem;
}

.main-nav a:hover,
.main-nav a.active {
  color: var(--color-accent);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  background: none;
  border: none;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  border-radius: 1px;
}

/* Hero */
.hero {
  padding: 80px 0 96px;
  background: var(--color-hero-bg);
  border-bottom: 1px solid var(--color-border);
}

.hero-label {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-accent);
  margin: 0 0 16px;
}

.hero h1 {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 600;
  line-height: 1.25;
  margin: 0 0 20px;
  color: var(--color-text);
}

.hero-desc {
  max-width: 520px;
  color: var(--color-text-muted);
  margin: 0 0 32px;
  font-size: 1.05rem;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 12px 28px;
  border-radius: var(--radius);
  font-size: 0.95rem;
  font-weight: 500;
  transition: background 0.2s, color 0.2s, border-color 0.2s;
}

.btn-primary {
  background: var(--color-accent);
  color: #fff !important;
}

.btn-primary:hover {
  background: var(--color-accent-hover);
  color: #fff !important;
}

.btn-outline {
  border: 1px solid var(--color-accent);
  color: var(--color-accent) !important;
  background: transparent;
}

.btn-outline:hover {
  background: var(--color-accent);
  color: #fff !important;
}

/* Sections */
.section {
  padding: 72px 0;
}

.section-alt {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.section-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 40px;
}

.section-header h2 {
  font-family: var(--font-serif);
  font-size: 1.75rem;
  margin: 0;
}

.link-more {
  font-size: 0.9rem;
}

/* Post grid */
.post-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 28px;
}

.post-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow);
  transition: transform 0.2s, box-shadow 0.2s;
}

.post-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.08);
}

.post-card time {
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

.post-card h3 {
  font-size: 1.15rem;
  margin: 12px 0;
  line-height: 1.4;
}

.post-card h3 a {
  color: var(--color-text);
}

.post-card h3 a:hover {
  color: var(--color-accent);
}

.post-card p {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  margin: 0 0 16px;
}

.read-more {
  font-size: 0.9rem;
  font-weight: 500;
}

/* About preview */
.about-preview {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 48px;
  align-items: center;
}

.about-preview h2 {
  font-family: var(--font-serif);
  font-size: 1.75rem;
  margin: 0 0 16px;
}

.about-preview p {
  color: var(--color-text-muted);
  max-width: 560px;
  margin: 0 0 24px;
}

.stats {
  display: flex;
  gap: 40px;
}

.stat-item {
  text-align: center;
}

.stat-num {
  display: block;
  font-size: 2rem;
  font-weight: 600;
  color: var(--color-accent);
}

.stat-label {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

/* Page layouts */
.page-main {
  padding: 48px 0 80px;
}

.page-header {
  margin-bottom: 40px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--color-border);
}

.page-header h1 {
  font-family: var(--font-serif);
  font-size: 2rem;
  margin: 0 0 8px;
}

.page-header p {
  margin: 0;
  color: var(--color-text-muted);
}

/* Post list */
.post-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.post-list-item {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 24px;
  padding: 32px 0;
  border-bottom: 1px solid var(--color-border);
}

.post-list-item time {
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

.post-list-item h2 {
  font-size: 1.35rem;
  margin: 0 0 8px;
}

.post-list-item h2 a {
  color: var(--color-text);
}

.post-list-item h2 a:hover {
  color: var(--color-accent);
}

.post-list-item > div > p {
  color: var(--color-text-muted);
  margin: 0 0 12px;
}

.tag {
  display: inline-block;
  font-size: 0.75rem;
  padding: 2px 10px;
  margin-right: 6px;
  background: var(--color-hero-bg);
  border-radius: 4px;
  color: var(--color-text-muted);
}

/* Prose (article / about) */
.prose {
  max-width: 720px;
}

.prose h2 {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  margin: 40px 0 16px;
}

.prose h2:first-of-type {
  margin-top: 0;
}

.prose p,
.prose li {
  color: var(--color-text-muted);
}

.prose ul {
  padding-left: 1.4em;
}

.prose strong {
  color: var(--color-text);
}

.article-meta {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  margin-bottom: 32px;
}

.article-meta .tag {
  margin-left: 8px;
}

/* Footer */
.site-footer {
  background: var(--color-text);
  color: #ccc;
  padding: 48px 0 32px;
  margin-top: auto;
}

.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  padding-bottom: 32px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
  margin-bottom: 24px;
}

.footer-top strong {
  color: #fff;
  font-size: 1.1rem;
}

.footer-top p {
  margin: 8px 0 0;
  font-size: 0.9rem;
}

.footer-nav {
  display: flex;
  gap: 20px;
}

.footer-nav a {
  color: #aaa;
  font-size: 0.9rem;
}

.footer-nav a:hover {
  color: #fff;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  font-size: 0.85rem;
}

.footer-bottom p {
  margin: 0;
}

/* Responsive */
@media (max-width: 768px) {
  .main-nav {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: 12px 24px 20px;
  }

  .main-nav.is-open {
    display: flex;
  }

  .main-nav a {
    padding: 12px 0;
    border-bottom: 1px solid var(--color-border);
  }

  .nav-toggle {
    display: flex;
  }

  .hero {
    padding: 56px 0 64px;
  }

  .about-preview {
    grid-template-columns: 1fr;
  }

  .stats {
    justify-content: flex-start;
  }

  .post-list-item {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .section-header {
    flex-direction: column;
    gap: 12px;
  }

  .footer-top {
    flex-direction: column;
    gap: 24px;
  }
}