/* ============================================
   个人网站样式
   ============================================ */

:root {
  --primary: #4f6ef7;
  --primary-dark: #3a54d8;
  --text: #1f2430;
  --text-light: #5c6470;
  --bg: #ffffff;
  --bg-alt: #f6f8fc;
  --card-bg: #ffffff;
  --border: #e6e9f0;
  --shadow: 0 4px 20px rgba(31, 36, 48, 0.06);
  --radius: 14px;
  --container: 1000px;
}

* {
  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;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
}

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

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

/* ---------- 导航栏 ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.85);
  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: 64px;
}

.logo {
  font-size: 20px;
  font-weight: 700;
  color: var(--text);
}

.menu {
  display: flex;
  gap: 28px;
}

.menu a {
  color: var(--text-light);
  font-size: 15px;
  transition: color 0.2s;
}

.menu a:hover {
  color: var(--primary);
}

.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}

.menu-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform 0.3s, opacity 0.3s;
}

/* ---------- Hero ---------- */
.hero {
  padding: 120px 0 100px;
  text-align: center;
  background: linear-gradient(180deg, #eef2ff 0%, var(--bg) 100%);
}

.hero-name {
  font-size: clamp(32px, 5vw, 48px);
  font-weight: 800;
  margin-bottom: 12px;
}

.accent {
  color: var(--primary);
}

.hero-sub {
  font-size: 18px;
  color: var(--text-light);
  margin-bottom: 16px;
}

.hero-desc {
  color: var(--text-light);
  max-width: 560px;
  margin: 0 auto 32px;
}

.hero-actions {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-block;
  padding: 12px 28px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  transition: transform 0.2s, box-shadow 0.2s, background 0.2s;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn-primary {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 6px 20px rgba(79, 110, 247, 0.35);
}

.btn-primary:hover {
  background: var(--primary-dark);
}

.btn-outline {
  border: 2px solid var(--primary);
  color: var(--primary);
}

.btn-outline:hover {
  background: rgba(79, 110, 247, 0.08);
}

/* ---------- 通用区块 ---------- */
.section {
  padding: 90px 0;
}

.section-alt {
  background: var(--bg-alt);
}

.section-title {
  font-size: 30px;
  font-weight: 800;
  text-align: center;
  margin-bottom: 20px;
}

.section-desc {
  text-align: center;
  color: var(--text-light);
  max-width: 640px;
  margin: 0 auto 44px;
}

/* ---------- 卡片网格 ---------- */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}

.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow);
  transition: transform 0.25s, box-shadow 0.25s;
  display: block;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(31, 36, 48, 0.1);
}

.card-icon {
  font-size: 32px;
  margin-bottom: 12px;
}

.card h3 {
  font-size: 18px;
  margin-bottom: 8px;
}

.card p {
  color: var(--text-light);
  font-size: 14.5px;
}

.project-card .card-link {
  display: inline-block;
  margin-top: 14px;
  font-size: 14px;
  font-weight: 600;
  color: var(--primary);
}

/* ---------- 联系 ---------- */
.contact-links {
  display: flex;
  gap: 18px;
  justify-content: center;
  flex-wrap: wrap;
}

.contact-item {
  padding: 12px 26px;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--text);
  background: var(--card-bg);
  font-size: 15px;
  transition: border-color 0.2s, color 0.2s, transform 0.2s;
}

.contact-item:hover {
  border-color: var(--primary);
  color: var(--primary);
  transform: translateY(-2px);
}

/* ---------- 页脚 ---------- */
.footer {
  padding: 28px 0;
  border-top: 1px solid var(--border);
  text-align: center;
  color: var(--text-light);
  font-size: 14px;
}

/* ---------- 移动端适配 ---------- */
@media (max-width: 640px) {
  .menu {
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: center;
    gap: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    padding: 12px 0;
    transform: translateY(-120%);
    transition: transform 0.3s;
    box-shadow: var(--shadow);
  }

  .menu.open {
    transform: translateY(0);
  }

  .menu a {
    padding: 14px 0;
    width: 100%;
    text-align: center;
  }

  .menu-toggle {
    display: flex;
  }

  .hero {
    padding: 80px 0 70px;
  }

  .section {
    padding: 64px 0;
  }
}