/* ==========================================================================
   杨楷亮开发测试使用 - 极简个人技术网站样式
   ========================================================================== */

:root {
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-light: #eff6ff;
  --text-main: #0f172a;
  --text-muted: #64748b;
  --text-light: #94a3b8;
  --bg-body: #f8fafc;
  --bg-card: #ffffff;
  --border-color: #e2e8f0;
  --border-focus: #cbd5e1;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.06), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 9999px;
  --transition: all 0.2s ease-in-out;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background-color: var(--bg-body);
  color: var(--text-main);
  line-height: 1.6;
  min-height: 100vh;
}

.content-wrapper {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 20px;
}

/* 顶部浮动导航栏 */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  width: 100%;
  height: 64px;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  z-index: 100;
  transition: var(--transition);
}

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

.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text-main);
}

.brand-badge {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, #2563eb, #3b82f6);
  color: #ffffff;
  font-weight: 700;
  font-size: 0.95rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  box-shadow: 0 2px 6px rgba(37, 99, 235, 0.3);
}

.brand-text h1 {
  font-size: 1.05rem;
  font-weight: 700;
  line-height: 1.2;
}

.brand-text span {
  font-size: 0.65rem;
  color: var(--text-muted);
  letter-spacing: 0.5px;
  display: block;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
  list-style: none;
}

.nav-link {
  text-decoration: none;
  color: var(--text-muted);
  font-size: 0.92rem;
  font-weight: 500;
  transition: var(--transition);
  padding: 4px 0;
}

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

/* 主体容器 */
.app-container {
  padding-top: 88px;
  padding-bottom: 60px;
}

/* 1. Hero 区域 */
.hero-section {
  margin-bottom: 32px;
}

.hero-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 36px;
  box-shadow: var(--shadow-sm);
}

.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 4px 12px;
  background: var(--primary-light);
  color: var(--primary);
  border-radius: var(--radius-full);
  font-size: 0.82rem;
  font-weight: 600;
  margin-bottom: 16px;
}

.pulse-dot {
  width: 8px;
  height: 8px;
  background: #10b981;
  border-radius: 50%;
  box-shadow: 0 0 0 2px rgba(16, 185, 129, 0.2);
}

.hero-title {
  font-size: 1.85rem;
  font-weight: 800;
  color: var(--text-main);
  letter-spacing: -0.5px;
  margin-bottom: 12px;
}

.hero-desc {
  font-size: 1.02rem;
  color: var(--text-muted);
  line-height: 1.7;
  max-width: 800px;
  margin-bottom: 20px;
}

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag {
  background: #f1f5f9;
  color: #475569;
  font-size: 0.8rem;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  font-weight: 500;
}

/* 通用区块卡片 */
.section-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px;
  margin-bottom: 28px;
  box-shadow: var(--shadow-sm);
}

.section-header {
  margin-bottom: 24px;
}

.section-badge {
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--primary);
  letter-spacing: 1px;
  text-transform: uppercase;
}

.section-title {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-main);
  margin-top: 4px;
}

/* 关于我与初心 */
.about-content p {
  color: var(--text-muted);
  font-size: 0.98rem;
  line-height: 1.75;
  margin-bottom: 24px;
}

.principles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.principle-item {
  background: #f8fafc;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 20px;
  text-align: center;
}

.item-icon {
  font-size: 1.75rem;
  margin-bottom: 10px;
}

.principle-item h4 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 6px;
}

.principle-item p {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.5;
  margin-bottom: 0;
}

/* 技术栈网格 */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.skill-group {
  background: #f8fafc;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 20px;
}

.skill-group h4 {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 14px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-color);
}

.pill-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.pill {
  background: #ffffff;
  border: 1px solid #cbd5e1;
  color: #334155;
  font-size: 0.82rem;
  font-weight: 500;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.02);
}

/* 笔记卡片 */
.notes-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.note-card {
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 20px;
  background: #ffffff;
  transition: var(--transition);
}

.note-card:hover {
  border-color: #93c5fd;
  box-shadow: var(--shadow-md);
}

.note-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
}

.note-cat {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--primary);
  background: var(--primary-light);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
}

.note-date {
  font-size: 0.78rem;
  color: var(--text-light);
}

.note-title {
  font-size: 1.08rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 8px;
}

.note-summary {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* 页尾 */
.footer {
  border-top: 1px solid var(--border-color);
  background: #ffffff;
  padding: 36px 0;
  text-align: center;
}

.footer-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 6px;
}

.footer-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 10px;
}

.footer-icp {
  font-size: 0.82rem;
  color: var(--text-muted);
}

.icp-link {
  color: var(--primary);
  text-decoration: none;
  font-weight: 500;
  transition: var(--transition);
}

.icp-link:hover {
  text-decoration: underline;
  color: var(--primary-hover);
}

/* 响应式适配 */
@media (max-width: 768px) {
  .hero-card {
    padding: 24px 18px;
  }

  .hero-title {
    font-size: 1.45rem;
  }

  .section-card {
    padding: 20px 16px;
  }

  .principles-grid,
  .skills-grid {
    grid-template-columns: 1fr;
    gap: 14px;
  }

  .nav-links {
    gap: 14px;
  }

  .nav-link {
    font-size: 0.85rem;
  }
}