/* ================================================
   个人网站样式表
   修改说明：
   - 主色调 --accent 可换成你喜欢的颜色
   - 字体可替换 font-family
   ================================================ */

:root {
  --bg:        #0d1117;
  --bg-card:   #161b22;
  --bg-hover:  #1c2230;
  --border:    #30363d;
  --text:      #e6edf3;
  --muted:     #8b949e;
  --accent:    #4f8ef7;
  --accent-dim:#1a2f5a;
  --tag-law:   #1e3a5f;
  --tag-ai:    #1e3a2e;
  --tag-econ:  #3a2a1e;
  --tag-book:  #2e1e3a;
  --radius:    10px;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  font-size: 16px;
  line-height: 1.7;
}

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

/* ---- 导航 ---- */
nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(13,17,23,0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  padding: 0 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}

.nav-logo {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: .04em;
}

.nav-links {
  display: flex;
  gap: 2rem;
  list-style: none;
}

.nav-links a {
  color: var(--muted);
  font-size: 0.95rem;
  transition: color .2s;
}
.nav-links a:hover { color: var(--text); text-decoration: none; }

/* ---- Hero ---- */
#hero {
  padding: 100px 2rem 80px;
  max-width: 860px;
  margin: 0 auto;
}

.hero-tag {
  display: inline-block;
  background: var(--accent-dim);
  color: var(--accent);
  font-size: 0.8rem;
  letter-spacing: .08em;
  padding: 4px 12px;
  border-radius: 20px;
  margin-bottom: 1.4rem;
}

#hero h1 {
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: .8rem;
}

#hero h1 span { color: var(--accent); }

.hero-sub {
  color: var(--muted);
  font-size: 1.05rem;
  max-width: 580px;
  margin-bottom: 2rem;
}

.hero-btns { display: flex; gap: 1rem; flex-wrap: wrap; }

.btn {
  display: inline-block;
  padding: 10px 24px;
  border-radius: 6px;
  font-size: 0.95rem;
  font-weight: 500;
  transition: opacity .2s, background .2s;
  cursor: pointer;
}
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { opacity: .85; text-decoration: none; }
.btn-outline {
  background: transparent;
  color: var(--muted);
  border: 1px solid var(--border);
}
.btn-outline:hover { color: var(--text); border-color: var(--muted); text-decoration: none; }

/* ---- 通用区块 ---- */
section { padding: 72px 2rem; }

.section-inner { max-width: 960px; margin: 0 auto; }

.section-label {
  font-size: 0.78rem;
  letter-spacing: .12em;
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: .6rem;
}

.section-title {
  font-size: 1.7rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.section-desc {
  color: var(--muted);
  max-width: 600px;
  margin-bottom: 2.5rem;
}

section + section { border-top: 1px solid var(--border); }

/* ---- 关于 ---- */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: start;
}

@media (max-width: 680px) { .about-grid { grid-template-columns: 1fr; } }

.about-photo {
  width: 100%;
  max-width: 260px;
  aspect-ratio: 1;
  border-radius: var(--radius);
  background: var(--bg-card);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--muted);
  font-size: 0.9rem;
  overflow: hidden;
}
.about-photo img { width: 100%; height: 100%; object-fit: cover; }

.about-text p { color: var(--muted); margin-bottom: 1rem; }
.about-text p:last-child { margin-bottom: 0; }

.tags { display: flex; flex-wrap: wrap; gap: .5rem; margin-top: 1.4rem; }
.tag {
  font-size: 0.8rem;
  padding: 4px 12px;
  border-radius: 20px;
  border: 1px solid var(--border);
  color: var(--muted);
}

/* ---- 文章 ---- */
.filter-bar {
  display: flex;
  gap: .5rem;
  flex-wrap: wrap;
  margin-bottom: 2rem;
}

.filter-btn {
  padding: 6px 16px;
  border-radius: 20px;
  font-size: 0.83rem;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  transition: all .2s;
}
.filter-btn:hover, .filter-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.2rem;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.4rem;
  display: flex;
  flex-direction: column;
  gap: .7rem;
  transition: background .2s, border-color .2s;
  cursor: pointer;
}
.article-card:hover { background: var(--bg-hover); border-color: var(--accent); }

.article-cat {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: .06em;
  padding: 3px 10px;
  border-radius: 4px;
  display: inline-block;
  width: fit-content;
}
.cat-law   { background: var(--tag-law);  color: #7ab8f5; }
.cat-ai    { background: var(--tag-ai);   color: #7df5a0; }
.cat-econ  { background: var(--tag-econ); color: #f5c07a; }
.cat-book  { background: var(--tag-book); color: #c07af5; }

.article-card h3 {
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.45;
}

.article-card p {
  font-size: 0.88rem;
  color: var(--muted);
  flex: 1;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-meta {
  font-size: 0.8rem;
  color: var(--muted);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* ---- 活动 ---- */
.timeline { position: relative; padding-left: 2rem; }

.timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 0; bottom: 0;
  width: 2px;
  background: var(--border);
}

.timeline-item {
  position: relative;
  margin-bottom: 2.2rem;
}
.timeline-item:last-child { margin-bottom: 0; }

.timeline-dot {
  position: absolute;
  left: -2rem;
  top: 6px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--bg);
  box-shadow: 0 0 0 2px var(--accent-dim);
}

.timeline-date {
  font-size: 0.8rem;
  color: var(--accent);
  margin-bottom: .3rem;
  letter-spacing: .04em;
}

.timeline-item h3 {
  font-size: 1.02rem;
  font-weight: 600;
  margin-bottom: .3rem;
}

.timeline-item p {
  font-size: 0.9rem;
  color: var(--muted);
}

/* ---- 联系 ---- */
#contact { background: var(--bg-card); }

.contact-box {
  max-width: 520px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: .9rem 0;
  border-bottom: 1px solid var(--border);
}
.contact-item:last-child { border-bottom: none; }

.contact-icon {
  width: 38px;
  height: 38px;
  border-radius: 8px;
  background: var(--accent-dim);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  flex-shrink: 0;
}

.contact-label { font-size: 0.78rem; color: var(--muted); }
.contact-value { font-size: 0.95rem; }

/* ---- 页脚 ---- */
footer {
  text-align: center;
  padding: 2rem;
  color: var(--muted);
  font-size: 0.83rem;
  border-top: 1px solid var(--border);
}

/* ---- 过滤隐藏 ---- */
.article-card.hidden { display: none; }