/* 基础变量与重置 */
:root {
  --bg: #f7f9fc;
  --surface: #ffffff;
  --surface-soft: #eef4ff;
  --text: #172033;
  --muted: #64748b;
  --line: #d9e2ef;
  --blue: #2563eb;
  --blue-dark: #1d4ed8;
  --shadow: 0 18px 45px rgba(15, 23, 42, 0.08);
  --radius: 8px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Microsoft YaHei", sans-serif;
  line-height: 1.7;
}

a {
  color: inherit;
  text-decoration: none;
}

/* 通用布局 */
.container {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
}

.section {
  padding: 96px 0;
  scroll-margin-top: 68px;
}

.alt-section {
  background: #f1f5fb;
}

.section-label,
.eyebrow {
  color: var(--blue);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  line-height: 1.25;
}

h2 {
  margin-top: 10px;
  font-size: clamp(2rem, 4vw, 3rem);
}

/* 顶部导航 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(247, 249, 252, 0.86);
  border-bottom: 1px solid rgba(217, 226, 239, 0.8);
  backdrop-filter: blur(14px);
}

.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.logo {
  font-size: 1.35rem;
  font-weight: 800;
}

.logo span {
  color: var(--blue);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

.nav-links a {
  color: var(--muted);
  font-size: 0.95rem;
  transition: color 0.2s ease;
}

.nav-links a:hover {
  color: var(--blue);
}

.menu-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  cursor: pointer;
}

.menu-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  margin: 4px auto;
  background: var(--text);
  transition: transform 0.2s ease, opacity 0.2s ease;
}

/* 首页 */
.hero {
  min-height: calc(100vh - 68px);
  display: flex;
  align-items: center;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.25fr 0.75fr;
  gap: 64px;
  align-items: center;
}

.hero h1 {
  margin-top: 14px;
  font-size: clamp(3.4rem, 8vw, 6.2rem);
}

.type-line {
  color: var(--blue);
}

.type-line {
  min-height: 42px;
  margin-top: 18px;
  font-size: clamp(1.2rem, 3vw, 1.65rem);
  font-weight: 700;
}

.cursor {
  display: inline-block;
  animation: blink 0.8s infinite;
}

.hero-desc {
  max-width: 680px;
  margin-top: 22px;
  color: var(--muted);
  font-size: 1.05rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 34px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 22px;
  border: 1px solid var(--blue);
  border-radius: var(--radius);
  font-weight: 700;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 25px rgba(37, 99, 235, 0.16);
}

.btn.primary {
  background: var(--blue);
  color: #ffffff;
}

.btn.secondary {
  color: var(--blue);
}

.btn.secondary:hover {
  background: var(--surface-soft);
}

.profile-card {
  padding: 34px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
  transition: transform 0.24s ease, box-shadow 0.24s ease;
}

.profile-card:hover,
.skill-card:hover,
.project-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 22px 55px rgba(15, 23, 42, 0.12);
}

.avatar {
  display: grid;
  place-items: center;
  width: 132px;
  height: 132px;
  margin-bottom: 24px;
  border-radius: 50%;
  background: linear-gradient(135deg, #dbeafe, #eff6ff);
  color: var(--blue);
  font-size: 3.8rem;
  font-weight: 900;
  letter-spacing: 0.08em;
}

.profile-card h2 {
  font-size: 1.65rem;
}

.profile-card p {
  margin-top: 8px;
  color: var(--muted);
}

.status {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 22px;
  padding: 8px 12px;
  border-radius: 999px;
  background: var(--surface-soft);
  color: var(--blue-dark);
  font-size: 0.88rem;
  font-weight: 700;
}

.status span {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #22c55e;
}

/* 内容区 */
.two-column {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 56px;
}

.section-text {
  color: var(--muted);
  font-size: 1.05rem;
}

.section-text p + p {
  margin-top: 18px;
}

.skill-grid,
.project-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin-top: 34px;
}

.project-grid {
  grid-template-columns: repeat(2, 1fr);
}

.skill-card,
.project-card,
.experience-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  transition: transform 0.24s ease, box-shadow 0.24s ease, border-color 0.24s ease;
}

.skill-card {
  padding: 24px;
}

.skill-card:hover,
.project-card:hover,
.experience-card:hover {
  border-color: #bfdbfe;
}

.skill-card h3,
.project-card h3,
.experience-card h3 {
  margin-bottom: 12px;
  font-size: 1.12rem;
}

.skill-card p,
.project-card p,
.experience-card p,
.contact-box p {
  color: var(--muted);
}

.experience-card {
  padding: 28px;
  box-shadow: var(--shadow);
}

.experience-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 22px 55px rgba(15, 23, 42, 0.12);
}

.experience-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  margin-bottom: 16px;
}

.experience-meta span,
.experience-meta strong {
  display: inline-flex;
  align-items: center;
  min-height: 30px;
  padding: 0 11px;
  border-radius: 999px;
  font-size: 0.82rem;
}

.experience-meta span {
  background: var(--surface-soft);
  color: var(--blue-dark);
  font-weight: 700;
}

.experience-meta strong {
  border: 1px solid var(--line);
  color: var(--text);
}

.project-card {
  padding: 26px;
}

.project-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 30px;
}

.project-top span {
  color: var(--blue);
  font-weight: 800;
}

.project-top a {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--blue);
  transition: background 0.2s ease, color 0.2s ease;
}

.project-top a:hover {
  background: var(--blue);
  color: #ffffff;
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 22px;
}

.tags span {
  padding: 5px 9px;
  border-radius: 999px;
  background: var(--surface-soft);
  color: var(--blue-dark);
  font-size: 0.78rem;
  font-weight: 700;
}

.contact-box {
  text-align: center;
}

.direction-wrap {
  max-width: 900px;
}

.direction-list {
  display: grid;
  gap: 14px;
  margin-top: 34px;
}

.direction-item {
  display: grid;
  grid-template-columns: 54px 1fr;
  gap: 18px;
  align-items: start;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  transition: transform 0.24s ease, box-shadow 0.24s ease, border-color 0.24s ease;
}

.direction-item:hover {
  transform: translateY(-4px);
  border-color: #bfdbfe;
  box-shadow: 0 18px 45px rgba(15, 23, 42, 0.1);
}

.direction-item span {
  color: var(--blue);
  font-weight: 900;
}

.direction-item p {
  color: var(--muted);
}

.contact-box p {
  max-width: 650px;
  margin: 16px auto 0;
}

.contact-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 14px;
  margin-top: 28px;
}

.contact-links a {
  padding: 10px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--blue);
  font-weight: 700;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.contact-links a:hover {
  transform: translateY(-2px);
  border-color: var(--blue);
}

.footer {
  padding: 28px 0;
  border-top: 1px solid var(--line);
  color: var(--muted);
  text-align: center;
}

@keyframes blink {
  0%,
  45% {
    opacity: 1;
  }

  46%,
  100% {
    opacity: 0;
  }
}

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.65s ease, transform 0.65s ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* 平板与手机端适配 */
@media (max-width: 900px) {
  .section {
    padding: 76px 0;
  }

  .hero-grid,
  .two-column {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .skill-grid,
  .project-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 680px) {
  .container {
    width: min(100% - 28px, 1120px);
  }

  .menu-toggle {
    display: block;
  }

  .menu-toggle.active span:nth-child(1) {
    transform: translateY(6px) rotate(45deg);
  }

  .menu-toggle.active span:nth-child(2) {
    opacity: 0;
  }

  .menu-toggle.active span:nth-child(3) {
    transform: translateY(-6px) rotate(-45deg);
  }

  .nav-links {
    position: absolute;
    top: 68px;
    left: 14px;
    right: 14px;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 10px;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: var(--surface);
    box-shadow: var(--shadow);
  }

  .nav-links.open {
    display: flex;
  }

  .nav-links a {
    display: block;
    padding: 12px;
  }

  .hero {
    min-height: auto;
    padding-top: 82px;
  }

  .hero-actions,
  .contact-links {
    flex-direction: column;
  }

  .btn,
  .contact-links a {
    width: 100%;
  }

  .profile-card {
    padding: 26px;
  }

  .skill-grid,
  .project-grid {
    grid-template-columns: 1fr;
  }

  .direction-item {
    grid-template-columns: 1fr;
    gap: 8px;
  }
}