:root {
  --bg: #f6f2eb;
  --bg-card: #fffcf7;
  --text: #1c1917;
  --text-muted: #57534e;
  --accent: #bd5836;
  --accent-soft: #f3dccd;
  --border: rgba(28, 25, 23, 0.1);
  --shadow: 0 24px 64px rgba(28, 25, 23, 0.08);
  --radius: 20px;
  --font-serif: "Noto Serif SC", "Songti SC", serif;
  --font-sans: "DM Sans", "PingFang SC", "Microsoft YaHei", sans-serif;
  --max-width: 1080px;
  --header-height: 72px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.65;
  color: var(--text);
  background: var(--bg);
  overflow-x: hidden;
}

.grain {
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: 0.35;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.5'/%3E%3C/svg%3E");
  z-index: 0;
}

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

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
  padding: 0 max(24px, calc((100vw - var(--max-width)) / 2));
  backdrop-filter: blur(16px);
  background: rgba(246, 242, 235, 0.75);
  border-bottom: 1px solid var(--border);
}

.logo {
  font-family: var(--font-serif);
  font-size: 1.125rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.nav {
  display: flex;
  gap: 32px;
}

.nav a {
  font-size: 0.9375rem;
  color: var(--text-muted);
  transition: color 0.2s;
}

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

.header-github {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--bg-card);
  transition: transform 0.2s, color 0.2s, border-color 0.2s;
}

.header-github:hover {
  transform: translateY(-2px);
  color: var(--accent);
  border-color: var(--accent);
}

.menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  width: 40px;
  height: 40px;
  padding: 0;
  border: none;
  background: transparent;
  cursor: pointer;
}

.menu-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  margin: 0 auto;
  background: var(--text);
  transition: transform 0.25s, opacity 0.25s;
}

main {
  position: relative;
  z-index: 1;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: calc(var(--header-height) + 48px) 24px 80px;
}

.hero {
  padding: 72px 0 96px;
  animation: fadeUp 0.8s ease both;
}

.hero-label {
  display: inline-block;
  margin: 0 0 20px;
  padding: 6px 14px;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-soft);
  border-radius: 999px;
}

.hero h1 {
  margin: 0 0 24px;
  font-family: var(--font-serif);
  font-size: clamp(2.75rem, 8vw, 4.75rem);
  font-weight: 700;
  line-height: 1.12;
  letter-spacing: -0.03em;
}

.hero h1 em {
  font-style: normal;
  color: var(--accent);
}

.hero-desc {
  max-width: 520px;
  margin: 0 0 36px;
  font-size: 1.125rem;
  color: var(--text-muted);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 48px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 24px;
  font-size: 0.9375rem;
  font-weight: 500;
  border-radius: 999px;
  transition: transform 0.2s, box-shadow 0.2s, background 0.2s;
}

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

.btn-primary {
  color: #fff;
  background: var(--accent);
  box-shadow: 0 12px 32px rgba(194, 65, 12, 0.25);
}

.btn-primary:hover {
  box-shadow: 0 16px 40px rgba(194, 65, 12, 0.32);
}

.btn-ghost {
  border: 1px solid var(--border);
  background: var(--bg-card);
}

.btn-github {
  gap: 8px;
  color: var(--text);
  border: 1px solid var(--border);
  background: var(--bg-card);
}

.btn-icon {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  margin: 0 0 36px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.hero-stats .stat {
  padding: 20px 22px;
  background: var(--bg-card);
}

.hero-stats dt {
  margin-bottom: 6px;
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
}

.hero-stats dd {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 1.0625rem;
  font-weight: 600;
}

.hero-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.875rem;
  color: var(--text-muted);
}

.hero-meta .dot {
  opacity: 0.4;
}

.section {
  padding: 72px 0;
  border-top: 1px solid var(--border);
  animation: fadeUp 0.8s ease both;
}

.section-head {
  display: flex;
  align-items: baseline;
  gap: 16px;
  margin-bottom: 40px;
}

.section-num {
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--accent);
}

.section h2 {
  margin: 0;
  font-family: var(--font-serif);
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  font-weight: 600;
}

.lead {
  max-width: 640px;
  margin: 0 0 32px;
  font-family: var(--font-serif);
  font-size: 1.375rem;
  line-height: 1.7;
}

.about-details {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.detail-card {
  padding: 28px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.detail-card h3 {
  margin: 0 0 10px;
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--accent);
}

.detail-card p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.9375rem;
}

.project-list {
  display: grid;
  gap: 20px;
}

.project-card {
  padding: 32px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: transform 0.25s, border-color 0.25s;
}

.project-card:hover {
  transform: translateY(-4px);
  border-color: rgba(194, 65, 12, 0.25);
}

.project-card--muted {
  opacity: 0.72;
}

.project-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

.project-tag {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent);
}

.project-year {
  font-size: 0.875rem;
  color: var(--text-muted);
}

.project-card h3 {
  margin: 0 0 10px;
  font-family: var(--font-serif);
  font-size: 1.5rem;
}

.project-card p {
  margin: 0 0 20px;
  color: var(--text-muted);
  max-width: 56ch;
}

.project-link {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--accent);
}

.project-link--disabled {
  color: var(--text-muted);
}

.skill-groups {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

.skill-group h3 {
  margin: 0 0 16px;
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
}

.skill-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.skill-cloud li {
  padding: 10px 18px;
  font-size: 0.9375rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 999px;
}

.skills-note {
  margin: 20px 0 0;
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.contact-box {
  padding: 40px;
  background: linear-gradient(135deg, #1c1917 0%, #44403c 100%);
  color: #fafaf9;
  border-radius: calc(var(--radius) + 4px);
  box-shadow: var(--shadow);
}

.contact-lead {
  margin: 0 0 32px;
  font-family: var(--font-serif);
  font-size: 1.375rem;
  line-height: 1.6;
}

.contact-links {
  display: grid;
  gap: 16px;
}

.contact-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 18px 20px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 14px;
  transition: background 0.2s, border-color 0.2s;
}

.contact-item:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(254, 215, 170, 0.35);
}

.contact-label {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-soft);
}

.contact-value {
  font-size: 1rem;
}

.site-footer {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 24px 24px 48px;
  font-size: 0.875rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border);
}

.site-footer p {
  margin: 0;
}

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 860px) {
  .about-details {
    grid-template-columns: 1fr;
  }

  .skill-groups {
    grid-template-columns: 1fr;
    gap: 28px;
  }
}

@media (max-width: 560px) {
  .hero-stats {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    padding: 12px 24px 24px;
    background: rgba(246, 242, 235, 0.96);
    border-bottom: 1px solid var(--border);
    transform: translateY(-120%);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.3s, opacity 0.3s;
  }

  .nav.is-open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav a {
    padding: 14px 0;
    border-bottom: 1px solid var(--border);
  }

  .menu-toggle {
    display: flex;
  }

  .menu-toggle[aria-expanded="true"] span:first-child {
    transform: translateY(4px) rotate(45deg);
  }

  .menu-toggle[aria-expanded="true"] span:last-child {
    transform: translateY(-4px) rotate(-45deg);
  }

  .hero {
    padding-top: 32px;
  }

  .contact-box {
    padding: 28px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }
}