/* ===== 基础变量与重置 ===== */
:root {
  --bg: #ffffff;
  --bg-alt: #f6f8fa;
  --text: #1f2328;
  --text-soft: #57606a;
  --accent: #2f6feb;
  --accent-dark: #1f4fbf;
  --border: #e3e6ea;
  --radius: 12px;
  --max-w: 880px;
  font-family: system-ui, -apple-system, "Segoe UI", "PingFang SC",
    "Microsoft YaHei", sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

/* ===== 导航 ===== */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--border);
}
.nav__inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 14px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav__logo {
  font-weight: 700;
  font-size: 1.2rem;
  color: var(--text);
}
.nav__menu {
  display: flex;
  gap: 24px;
}
.nav__menu a {
  color: var(--text-soft);
  font-size: 0.95rem;
}
.nav__menu a:hover {
  color: var(--accent);
  text-decoration: none;
}
.nav__toggle {
  display: none;
  font-size: 1.4rem;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text);
}

/* ===== 首屏 ===== */
.hero {
  background: linear-gradient(160deg, #eef3ff 0%, #ffffff 70%);
  padding: 96px 20px 80px;
  text-align: center;
}
.hero__inner {
  max-width: var(--max-w);
  margin: 0 auto;
}
.hero__avatar {
  width: 96px;
  height: 96px;
  margin: 0 auto 24px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  font-size: 2.4rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 8px 24px rgba(47, 111, 235, 0.3);
}
.hero__name {
  font-size: 2.4rem;
  margin-bottom: 12px;
}
.hero__tagline {
  color: var(--text-soft);
  font-size: 1.15rem;
  margin-bottom: 32px;
}
.hero__actions {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ===== 按钮 ===== */
.btn {
  display: inline-block;
  padding: 11px 26px;
  border-radius: var(--radius);
  font-size: 0.98rem;
  font-weight: 600;
  transition: all 0.18s ease;
}
.btn--primary {
  background: var(--accent);
  color: #fff;
}
.btn--primary:hover {
  background: var(--accent-dark);
  text-decoration: none;
}
.btn--ghost {
  border: 1px solid var(--border);
  color: var(--text);
}
.btn--ghost:hover {
  border-color: var(--accent);
  color: var(--accent);
  text-decoration: none;
}

/* ===== 通用区块 ===== */
.section {
  padding: 72px 20px;
}
.section--alt {
  background: var(--bg-alt);
}
.section__inner {
  max-width: var(--max-w);
  margin: 0 auto;
}
.section__title {
  font-size: 1.7rem;
  margin-bottom: 24px;
  position: relative;
  padding-left: 14px;
}
.section__title::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  bottom: 6px;
  width: 4px;
  border-radius: 2px;
  background: var(--accent);
}
.about__text {
  color: var(--text-soft);
  font-size: 1.05rem;
}

/* ===== 技能 ===== */
.skills {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.skills__item {
  background: #fff;
  border: 1px solid var(--border);
  padding: 10px 20px;
  border-radius: 999px;
  font-size: 0.95rem;
  color: var(--text);
}

/* ===== 联系 ===== */
.contact__text {
  color: var(--text-soft);
  margin-bottom: 16px;
}
.contact__list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
  color: var(--text);
}

/* ===== 页脚 ===== */
.footer {
  border-top: 1px solid var(--border);
  padding: 32px 20px;
  text-align: center;
}
.footer__inner {
  max-width: var(--max-w);
  margin: 0 auto;
}
.footer__copy {
  color: var(--text-soft);
  font-size: 0.9rem;
  margin-bottom: 6px;
}
.footer__beian a {
  color: var(--text-soft);
  font-size: 0.88rem;
}

/* ===== 响应式 ===== */
@media (max-width: 600px) {
  .nav__menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    background: #fff;
    border-bottom: 1px solid var(--border);
    padding: 8px 0;
  }
  .nav__menu.is-open {
    display: flex;
  }
  .nav__menu a {
    padding: 12px 20px;
  }
  .nav__toggle {
    display: block;
  }
  .hero__name {
    font-size: 1.9rem;
  }
}