:root {
  --bg: #0f1412;
  --bg2: #17201c;
  --ink: #e8efe9;
  --muted: #9aafa3;
  --green: #3d8b6e;
  --green-bright: #5cb08a;
  --sand: #d6c4a1;
  --line: rgba(232, 239, 233, 0.12);
  --card: rgba(255, 255, 255, 0.03);
  --font-display: "Instrument Serif", "Noto Serif SC", serif;
  --font-body: "Noto Sans SC", system-ui, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  font-family: var(--font-body);
  background:
    radial-gradient(1200px 700px at 80% -10%, rgba(61, 139, 110, 0.28), transparent 55%),
    radial-gradient(900px 500px at -10% 30%, rgba(214, 196, 161, 0.08), transparent 50%),
    linear-gradient(180deg, var(--bg) 0%, #0b100e 100%);
  overflow-x: hidden;
}

.noise {
  pointer-events: none;
  position: fixed;
  inset: 0;
  opacity: 0.04;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  z-index: 0;
}

.top, main, footer { position: relative; z-index: 1; }

.top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 6vw;
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(8px);
  position: sticky;
  top: 0;
  background: rgba(15, 20, 18, 0.72);
}

.brand {
  font-family: var(--font-display);
  font-size: 1.55rem;
  color: var(--green-bright);
  text-decoration: none;
  letter-spacing: 0.04em;
}

nav { display: flex; gap: 1.5rem; }
nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.95rem;
  transition: color 0.2s ease;
}
nav a:hover { color: var(--ink); }

.hero {
  min-height: calc(100vh - 72px);
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 2rem;
  align-items: center;
  padding: 4vh 6vw 8vh;
}

.brand-mark {
  margin: 0 0 0.75rem;
  font-family: var(--font-display);
  font-size: clamp(2.8rem, 7vw, 5.5rem);
  line-height: 0.95;
  color: var(--green-bright);
  letter-spacing: 0.02em;
  animation: rise 0.9s ease both;
}

.hero h1 {
  margin: 0;
  max-width: 14ch;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(1.6rem, 3.4vw, 2.5rem);
  color: var(--sand);
  animation: rise 1s ease 0.1s both;
}

.lead {
  margin: 1.25rem 0 0;
  max-width: 36ch;
  color: var(--muted);
  font-size: 1.05rem;
  line-height: 1.7;
  animation: rise 1.05s ease 0.18s both;
}

.cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 2rem;
  animation: rise 1.1s ease 0.26s both;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.85rem 1.35rem;
  border-radius: 999px;
  text-decoration: none;
  font-size: 0.95rem;
  transition: transform 0.2s ease, background 0.2s ease, color 0.2s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn.primary {
  background: var(--green);
  color: #fff;
}
.btn.primary:hover { background: var(--green-bright); }
.btn.ghost {
  border: 1px solid var(--line);
  color: var(--ink);
  background: transparent;
}
.btn.ghost:hover { border-color: var(--green-bright); color: var(--green-bright); }

.hero-visual {
  min-height: 420px;
  border: 1px solid var(--line);
  border-radius: 2px;
  background:
    linear-gradient(145deg, rgba(61,139,110,0.18), transparent 45%),
    linear-gradient(180deg, var(--bg2), #101714);
  position: relative;
  overflow: hidden;
  animation: fade 1.2s ease 0.2s both;
}

.circuit { position: absolute; inset: 0; }
.node {
  position: absolute;
  width: 12px; height: 12px;
  border-radius: 50%;
  background: var(--green-bright);
  box-shadow: 0 0 0 8px rgba(92, 176, 138, 0.12);
}
.n1 { top: 22%; left: 24%; }
.n2 { top: 48%; left: 62%; }
.n3 { top: 72%; left: 38%; }
.trace {
  position: absolute;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--green-bright), transparent);
  opacity: 0.55;
}
.t1 { top: 24%; left: 26%; width: 38%; transform: rotate(18deg); }
.t2 { top: 50%; left: 40%; width: 28%; transform: rotate(-12deg); }
.pulse {
  position: absolute;
  width: 180px; height: 180px;
  border-radius: 50%;
  border: 1px solid rgba(92, 176, 138, 0.35);
  top: 40%; left: 45%;
  transform: translate(-50%, -50%);
  animation: pulse 3.2s ease-in-out infinite;
}

.section {
  padding: 5.5rem 6vw;
  border-top: 1px solid var(--line);
}
.section.band { background: rgba(255,255,255,0.015); }
.section h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 400;
  color: var(--ink);
}
.section-lead {
  margin: 0.75rem 0 0;
  color: var(--muted);
  max-width: 42ch;
  line-height: 1.7;
}

.work-grid {
  margin-top: 2.5rem;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}
.work-grid-6 {
  grid-template-columns: repeat(3, 1fr);
}
.work-grid article {
  padding: 1.5rem 1.35rem;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 2px;
  transition: border-color 0.25s ease, transform 0.25s ease;
}
.work-grid article:hover {
  border-color: rgba(92, 176, 138, 0.45);
  transform: translateY(-3px);
}
.work-grid h3 {
  margin: 0 0 0.6rem;
  font-size: 1.15rem;
  font-weight: 500;
  color: var(--sand);
}
.work-grid p {
  margin: 0;
  color: var(--muted);
  line-height: 1.65;
  font-size: 0.95rem;
}

.caps {
  list-style: none;
  margin: 2.2rem 0 0;
  padding: 0;
  display: grid;
  gap: 1rem;
}
.caps li {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 1rem;
  padding: 1.1rem 0;
  border-bottom: 1px solid var(--line);
}
.caps strong { color: var(--green-bright); font-weight: 500; }
.caps span { color: var(--muted); }

.download-card {
  margin-top: 2.2rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem;
  padding: 1.6rem 1.5rem;
  border: 1px solid var(--line);
  background: var(--card);
}
.download-card h3 {
  margin: 0 0 0.4rem;
  font-size: 1.2rem;
  font-weight: 500;
  color: var(--sand);
}
.download-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.6;
}

.contact-layout {
  margin-top: 2rem;
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  gap: 2.5rem;
}
.contact-block {
  display: grid;
  gap: 0.7rem;
  flex: 1;
  min-width: 220px;
}
.contact-block p { margin: 0; color: var(--ink); }
.contact-block span {
  display: inline-block;
  width: 5.5rem;
  color: var(--muted);
}
.contact-block a { color: var(--green-bright); text-decoration: none; }
.contact-block a:hover { text-decoration: underline; }
.wechat-id {
  color: var(--green-bright);
  font-weight: 500;
  letter-spacing: 0.02em;
}
.wechat-qr {
  margin: 0;
  text-align: center;
}
.wechat-qr img {
  display: block;
  width: 220px;
  height: 220px;
  object-fit: cover;
  border-radius: 8px;
  background: #fff;
  padding: 10px;
  border: 1px solid var(--line);
}
.wechat-qr figcaption {
  margin-top: 0.65rem;
  color: var(--muted);
  font-size: 0.9rem;
}

footer {
  padding: 2rem 6vw 3rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.85rem;
}

@keyframes rise {
  from { opacity: 0; transform: translateY(18px); }
  to { opacity: 1; transform: none; }
}
@keyframes fade {
  from { opacity: 0; }
  to { opacity: 1; }
}
@keyframes pulse {
  0%, 100% { transform: translate(-50%, -50%) scale(0.85); opacity: 0.35; }
  50% { transform: translate(-50%, -50%) scale(1.15); opacity: 0.7; }
}

@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; min-height: auto; padding-top: 3rem; }
  .hero-visual { min-height: 280px; order: -1; }
  .work-grid,
  .work-grid-6 { grid-template-columns: 1fr; }
  .caps li { grid-template-columns: 1fr; gap: 0.35rem; }
  nav { gap: 1rem; }
}
@media (min-width: 901px) and (max-width: 1100px) {
  .work-grid-6 { grid-template-columns: repeat(2, 1fr); }
}