:root{
  --bg: #0b0f19;
  --card: rgba(255,255,255,.06);
  --text: rgba(255,255,255,.92);
  --muted: rgba(255,255,255,.70);
  --border: rgba(255,255,255,.12);
  --accent: #6ee7ff;
  --shadow: 0 12px 30px rgba(0,0,0,.35);
  --radius: 18px;
  --max: 1100px;
}

*{ box-sizing: border-box; }
html, body{ height: 100%; }

body{
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(1200px 600px at 20% 0%, rgba(110,231,255,.18), transparent 60%),
    radial-gradient(1000px 600px at 80% 10%, rgba(99,102,241,.18), transparent 55%),
    var(--bg);
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial;
  line-height: 1.55;
}

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

.container{
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 18px;
}

/* NAV */
.nav-wrap{
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(10px);
  background: rgba(11,15,25,.55);
  border-bottom: 1px solid var(--border);
}

.nav{
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand{
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 220px;
}

/* Logo 预留区 */
.logo{
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: linear-gradient(135deg, rgba(110,231,255,.35), rgba(99,102,241,.35));
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  display: grid;
  place-items: center;
  font-weight: 700;
  letter-spacing: .5px;
  font-size: 12px;
}

.brand-text{
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.brand-text strong{ font-size: 14px; }
.brand-text span{ font-size: 12px; color: var(--muted); }

.nav-links{
  display: flex;
  align-items: center;
  gap: 14px;
}

.nav-links a{
  padding: 10px 12px;
  border-radius: 12px;
  color: var(--muted);
}

.nav-links a:hover{
  background: rgba(255,255,255,.06);
  color: var(--text);
}

.nav-actions{
  display: flex;
  align-items: center;
  gap: 10px;
}

.btn{
  padding: 10px 14px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: rgba(255,255,255,.06);
  color: var(--text);
  cursor: pointer;
}

.btn:hover{ background: rgba(255,255,255,.10); }

.btn.primary{
  border-color: rgba(110,231,255,.45);
  background: rgba(110,231,255,.12);
}

/* Burger */
.burger{
  display: none;
  width: 44px;
  height: 44px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: rgba(255,255,255,.06);
  cursor: pointer;
  align-items: center;
  justify-content: center;
  gap: 4px;
  flex-direction: column;
}

.burger span{
  width: 18px;
  height: 2px;
  background: rgba(255,255,255,.82);
  border-radius: 999px;
}

/* Mobile menu */
.mobile-menu{
  display: none;
  padding: 12px 0 18px;
}

.mobile-menu a{
  display: block;
  padding: 12px 14px;
  margin: 6px 0;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: rgba(255,255,255,.05);
  color: var(--muted);
}

.mobile-menu a:hover{
  color: var(--text);
  background: rgba(255,255,255,.08);
}

.mobile-menu.open{ display: block; }

/* HERO */
.hero{ padding: 56px 0 20px; }

.hero-card{
  border: 1px solid var(--border);
  background: linear-gradient(180deg, rgba(255,255,255,.07), rgba(255,255,255,.03));
  border-radius: calc(var(--radius) + 6px);
  box-shadow: var(--shadow);
  padding: 28px;
  overflow: hidden;
}

.hero-grid{
  display: grid;
  grid-template-columns: 1.2fr .8fr;
  gap: 22px;
  align-items: center;
}

.badge{
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: rgba(255,255,255,.05);
  color: var(--muted);
  font-size: 12px;
}

h1{
  margin: 10px 0 10px;
  font-size: clamp(28px, 3.2vw, 42px);
  line-height: 1.1;
}

.lead{
  margin: 0 0 18px;
  color: var(--muted);
  font-size: 15px;
  max-width: 56ch;
}

.cta{
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 12px;
}

.stats{
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.stat{
  border: 1px solid var(--border);
  background: rgba(255,255,255,.05);
  border-radius: var(--radius);
  padding: 14px;
}

.stat strong{ display: block; font-size: 16px; margin-bottom: 4px; }
.stat span{ color: var(--muted); font-size: 12px; }

/* Sections */
.section{ padding: 26px 0; }

.section-title{
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin: 0 0 12px;
}

.section-title h2{ margin: 0; font-size: 18px; }
.section-title p{ margin: 0; color: var(--muted); font-size: 13px; }

.card{
  border: 1px solid var(--border);
  background: rgba(255,255,255,.04);
  border-radius: var(--radius);
  padding: 18px;
}

.muted{ color: var(--muted); }
.spacer{ height: 10px; }

.projects{
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 14px;
}

.project{
  grid-column: span 4;
  min-height: 150px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.project h3{ margin: 0; font-size: 15px; }

.tags{
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 4px;
}

.tag{
  font-size: 12px;
  color: var(--muted);
  border: 1px solid var(--border);
  background: rgba(255,255,255,.04);
  border-radius: 999px;
  padding: 6px 10px;
}

.contact-grid{
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

input, textarea{
  width: 100%;
  padding: 12px 12px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: rgba(0,0,0,.10);
  color: var(--text);
  outline: none;
}

textarea{
  min-height: 120px;
  resize: vertical;
}

.hint{ margin: 10px 0 0; font-size: 12px; }

.footer{
  padding: 22px 0 40px;
  border-top: 1px solid var(--border);
  margin-top: 18px;
  font-size: 12px;
}

/* Responsive */
@media (max-width: 900px){
  .hero-grid{ grid-template-columns: 1fr; }
  .brand{ min-width: auto; }
  .project{ grid-column: span 6; }
  .contact-grid{ grid-template-columns: 1fr; }
}

@media (max-width: 700px){
  .nav-links, .nav-actions .btn{ display: none; }
  .burger{ display: flex; }
  .project{ grid-column: span 12; }
}

.logo-img{
  width: 42px;
  height: 42px;
  border-radius: 12px;
  border: 1px solid var(--border);
  object-fit: cover;
  box-shadow: var(--shadow);
}

.projects-grid{
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 24px;
}

.project-card{
  background: rgba(255,255,255,.05);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 18px;
  box-shadow: var(--shadow);
  transition: transform .2s ease, box-shadow .2s ease;
}

.project-card:hover{
  transform: translateY(-4px);
  box-shadow: 0 16px 40px rgba(0,0,0,.4);
}

/* 响应式：平板 2 列，手机 1 列 */
@media (max-width: 900px){
  .projects-grid{
    grid-template-columns: repeat(2, 1fr);
  }
}
@media (max-width: 600px){
  .projects-grid{
    grid-template-columns: 1fr;
  }
}

.cv-list{
  list-style: none;
  padding: 0;
  margin: 14px 0 22px;
  display: grid;
  gap: 12px;
}

.cv-list li{
  border: 1px solid var(--border);
  background: rgba(255,255,255,.03);
  border-radius: 14px;
  padding: 12px 14px;
  transition: transform .2s ease, box-shadow .2s ease;
}

.cv-list li:hover{
  transform: translateY(-2px);
  box-shadow: 0 10px 25px rgba(0,0,0,.35);
}

.cv-title{
  margin: 0;
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
}

.cv-sub{
  margin: 2px 0 0;
  font-size: 12px;
  color: var(--muted);
}