/* ============================================================
 * 全站样式：CSS 变量定义亮色/深色两套主题
 * 深色模式：默认跟随系统，用户点击导航栏按钮可手动切换
 * ============================================================ */

:root {
  --bg: #f7f8fa;
  --bg-card: #ffffff;
  --bg-elevated: #ffffff;
  --text: #1f2329;
  --text-secondary: #646a73;
  --text-tertiary: #8f959e;
  --accent: #3370ff;
  --accent-hover: #2456d9;
  --accent-soft: rgba(51, 112, 255, 0.10);
  --border: #e5e6eb;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.06), 0 4px 14px rgba(0, 0, 0, 0.04);
  --shadow-hover: 0 4px 10px rgba(0, 0, 0, 0.08), 0 10px 30px rgba(0, 0, 0, 0.08);
  --header-bg: rgba(247, 248, 250, 0.85);
}

[data-theme="dark"] {
  --bg: #131418;
  --bg-card: #1c1e24;
  --bg-elevated: #24262e;
  --text: #e8eaed;
  --text-secondary: #a8adb5;
  --text-tertiary: #757b85;
  --accent: #5b8cff;
  --accent-hover: #7da3ff;
  --accent-soft: rgba(91, 140, 255, 0.16);
  --border: #2c2f38;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.4), 0 4px 14px rgba(0, 0, 0, 0.3);
  --shadow-hover: 0 4px 10px rgba(0, 0, 0, 0.5), 0 10px 30px rgba(0, 0, 0, 0.4);
  --header-bg: rgba(19, 20, 24, 0.85);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  transition: background 0.25s ease, color 0.25s ease;
}

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

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

.container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- 顶部导航 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--header-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}

.nav-brand {
  font-size: 18px;
  font-weight: 700;
  color: var(--text);
}
.nav-brand:hover { color: var(--accent); }

.nav-right { display: flex; align-items: center; gap: 4px; }

.nav-links { display: flex; gap: 4px; }

.nav-links a {
  padding: 6px 14px;
  border-radius: 8px;
  color: var(--text-secondary);
  font-size: 15px;
  transition: background 0.15s, color 0.15s;
}
.nav-links a:hover { background: var(--accent-soft); color: var(--accent); }
.nav-links a.active { background: var(--accent-soft); color: var(--accent); font-weight: 600; }

.theme-toggle {
  margin-left: 8px;
  width: 36px;
  height: 36px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--bg-card);
  color: var(--text-secondary);
  font-size: 17px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: border-color 0.15s, color 0.15s;
}
.theme-toggle:hover { border-color: var(--accent); color: var(--accent); }

/* 移动端菜单按钮 */
.nav-menu-btn {
  display: none;
  width: 36px;
  height: 36px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--bg-card);
  color: var(--text-secondary);
  font-size: 18px;
  cursor: pointer;
  align-items: center;
  justify-content: center;
}

/* ---------- 主体区域 ---------- */
main { padding: 40px 0 72px; min-height: calc(100vh - 60px - 70px); }

.page-title { font-size: 30px; font-weight: 700; margin-bottom: 8px; }
.page-desc { color: var(--text-secondary); margin-bottom: 32px; }

.section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin: 40px 0 20px;
}
.section-head h2 { font-size: 22px; font-weight: 700; }
.section-head .more-link { font-size: 14px; color: var(--text-tertiary); }
.section-head .more-link:hover { color: var(--accent); }

/* ---------- 首页 Hero ---------- */
.hero { padding: 36px 0 8px; }
.hero h1 { font-size: 34px; font-weight: 800; line-height: 1.3; }
.hero p { color: var(--text-secondary); font-size: 17px; margin-top: 10px; }

/* ---------- 作品卡片 ---------- */
.works-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 22px;
}

.work-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 14px;
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  display: flex;
  flex-direction: column;
}
.work-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-hover); }

.work-shot {
  aspect-ratio: 16 / 9;
  background: var(--bg-elevated);
  border-bottom: 1px solid var(--border);
}
.work-shot img { width: 100%; height: 100%; object-fit: cover; }

.work-body { padding: 18px 20px 20px; display: flex; flex-direction: column; flex: 1; }

.work-title { font-size: 17px; font-weight: 700; margin-bottom: 6px; }

.work-meta { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; margin-bottom: 10px; }

.tag {
  font-size: 12px;
  padding: 2px 10px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
}
.work-date { font-size: 12px; color: var(--text-tertiary); }

.work-summary { font-size: 14px; color: var(--text-secondary); flex: 1; }

.work-usage { margin-top: 12px; }
.work-usage summary {
  font-size: 13px;
  color: var(--text-tertiary);
  cursor: pointer;
  user-select: none;
}
.work-usage summary:hover { color: var(--accent); }
.work-usage ol {
  margin: 8px 0 0 20px;
  font-size: 13px;
  color: var(--text-secondary);
}
.work-usage li { margin-bottom: 4px; }

.work-actions { margin-top: 14px; }

.btn {
  display: inline-block;
  padding: 8px 20px;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 600;
  background: var(--accent);
  color: #fff;
  transition: background 0.15s;
}
.btn:hover { background: var(--accent-hover); color: #fff; }

/* ---------- 文章列表 ---------- */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 28px;
}

.filter-chip {
  padding: 5px 16px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text-secondary);
  font-size: 14px;
  cursor: pointer;
  transition: all 0.15s;
}
.filter-chip:hover { border-color: var(--accent); color: var(--accent); }
.filter-chip.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.year-group { margin-bottom: 8px; }
.year-label {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-tertiary);
  margin: 26px 0 12px;
}

.article-list { display: flex; flex-direction: column; gap: 12px; }

.article-item {
  display: block;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px 20px;
  transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s;
}
.article-item:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow);
  transform: translateY(-1px);
}

.article-top { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.article-title { font-size: 16px; font-weight: 600; color: var(--text); }
.article-item:hover .article-title { color: var(--accent); }
.article-summary { font-size: 14px; color: var(--text-secondary); margin-top: 6px; }
.article-date { font-size: 13px; color: var(--text-tertiary); margin-left: auto; white-space: nowrap; }

.empty-tip { color: var(--text-tertiary); padding: 40px 0; text-align: center; }

/* ---------- 个人介绍页 ---------- */
.about-hero {
  display: flex;
  align-items: center;
  gap: 28px;
  margin-bottom: 36px;
}
.about-avatar {
  width: 96px;
  height: 96px;
  border-radius: 50%;
  overflow: hidden;
  border: 3px solid var(--bg-card);
  box-shadow: var(--shadow);
  flex-shrink: 0;
}
.about-avatar img { width: 100%; height: 100%; object-fit: cover; }
.about-name { font-size: 26px; font-weight: 800; }
.about-slogan { color: var(--text-secondary); margin-top: 4px; }

.about-section { margin-bottom: 36px; }
.about-section h2 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 14px;
  padding-left: 12px;
  border-left: 4px solid var(--accent);
  line-height: 1.3;
}
.about-section p { color: var(--text-secondary); margin-bottom: 10px; }

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 12px;
}
.skill-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 16px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.skill-name { font-weight: 600; font-size: 15px; }
.skill-level { font-size: 12px; color: var(--accent); background: var(--accent-soft); padding: 2px 10px; border-radius: 999px; }

.contact-list { display: flex; flex-direction: column; gap: 10px; }
.contact-item {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 16px;
}
.contact-label {
  font-size: 13px;
  color: var(--text-tertiary);
  min-width: 60px;
}
.contact-value { font-size: 15px; color: var(--text); word-break: break-all; }
a.contact-value:hover { color: var(--accent); }

/* ---------- 页脚 ---------- */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 24px 0;
  text-align: center;
  color: var(--text-tertiary);
  font-size: 13px;
}

/* ---------- 移动端适配 ---------- */
@media (max-width: 720px) {
  .container { padding: 0 16px; }

  .nav-menu-btn { display: flex; }

  .nav-links {
    display: none;
    position: absolute;
    top: 60px;
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--bg-card);
    border-bottom: 1px solid var(--border);
    padding: 8px 16px 14px;
    gap: 2px;
    box-shadow: var(--shadow);
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 12px 14px; font-size: 16px; }

  .hero h1 { font-size: 26px; }
  .hero p { font-size: 15px; }
  .page-title { font-size: 24px; }

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

  .about-hero { flex-direction: column; text-align: center; gap: 16px; }

  .article-date { margin-left: 0; width: 100%; }
}