:root {
  --bg: #0a0c0f;
  --bg2: #11151b;
  --card: #161c24;
  --card-hover: #1c2430;
  --text: #f2f0ea;
  --muted: #9aa3b0;
  --accent: #c9a55c;
  --accent-soft: rgba(201, 165, 92, 0.16);
  --teal: #5eead4;
  --line: rgba(255, 255, 255, 0.08);
  --max: 1160px;
  --radius: 1.1rem;
  --nav-h: 64px;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: "PingFang SC", "Noto Sans SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
ul { list-style: none; }
.wrap { width: min(100% - 2rem, var(--max)); margin-inline: auto; }

/* Nav */
.nav {
  position: fixed; inset: 0 0 auto; z-index: 100;
  height: var(--nav-h);
  backdrop-filter: blur(16px);
  background: rgba(10, 12, 15, 0.78);
  border-bottom: 1px solid var(--line);
}
.nav-inner {
  height: 100%;
  display: flex; align-items: center; justify-content: space-between;
  width: min(100% - 2rem, var(--max)); margin-inline: auto; gap: 1rem;
}
.logo { font-weight: 700; letter-spacing: 0.04em; font-size: 0.95rem; white-space: nowrap; }
.logo em { font-style: normal; color: var(--accent); }
.nav-links { display: flex; gap: 1.35rem; font-size: 0.9rem; color: var(--muted); }
.nav-links a:hover, .nav-links a.active { color: var(--text); }
.nav-cta {
  font-size: 0.82rem; font-weight: 600;
  padding: 0.45rem 0.9rem; border-radius: 999px;
  background: var(--accent); color: #111;
}
.nav-toggle {
  display: none; background: none; border: 1px solid var(--line);
  color: var(--text); width: 40px; height: 40px; border-radius: 0.5rem; cursor: pointer;
}
.nav-toggle span { display: block; width: 18px; height: 2px; background: currentColor; margin: 4px auto; }

/* Hero — artistic motion background (no customer booth photos) */
.hero {
  min-height: 100vh; min-height: 100dvh;
  display: flex; align-items: flex-end;
  padding: calc(var(--nav-h) + 3rem) 0 4rem;
  position: relative;
  overflow: hidden;
  background: var(--bg);
}
.hero-art {
  position: absolute; inset: 0; pointer-events: none; z-index: 0;
  background:
    radial-gradient(ellipse 70% 55% at 78% 28%, rgba(201,165,92,0.16), transparent 60%),
    radial-gradient(ellipse 50% 40% at 18% 70%, rgba(94,234,212,0.08), transparent 55%),
    linear-gradient(160deg, #0a0c0f 0%, #121820 45%, #0a0c0f 100%);
}
.hero-grid {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 80% 70% at 50% 40%, #000 20%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 80% 70% at 50% 40%, #000 20%, transparent 75%);
  animation: hero-grid-drift 28s linear infinite;
}
@keyframes hero-grid-drift {
  from { transform: translate3d(0,0,0); }
  to { transform: translate3d(-64px, -32px, 0); }
}
.hero-glow {
  position: absolute; border-radius: 50%; filter: blur(48px); opacity: 0.55;
  will-change: transform;
}
.hero-glow-a {
  width: 420px; height: 420px; right: 8%; top: 12%;
  background: rgba(201,165,92,0.28);
  animation: hero-float-a 14s ease-in-out infinite;
}
.hero-glow-b {
  width: 320px; height: 320px; left: 6%; bottom: 18%;
  background: rgba(94,234,212,0.16);
  animation: hero-float-b 18s ease-in-out infinite;
}
@keyframes hero-float-a {
  0%, 100% { transform: translate3d(0,0,0) scale(1); }
  50% { transform: translate3d(-40px, 30px, 0) scale(1.08); }
}
@keyframes hero-float-b {
  0%, 100% { transform: translate3d(0,0,0) scale(1); }
  50% { transform: translate3d(36px, -24px, 0) scale(1.12); }
}
.hero-svg {
  position: absolute; inset: 0; width: 100%; height: 100%;
  opacity: 0.9;
}
.hero-orbit {
  transform-origin: 900px 280px;
  animation: hero-spin 48s linear infinite;
}
@keyframes hero-spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}
.hero-lines path {
  stroke-dasharray: 12 10;
  animation: hero-dash 22s linear infinite;
}
@keyframes hero-dash {
  to { stroke-dashoffset: -220; }
}
.hero-polys {
  animation: hero-pulse 8s ease-in-out infinite;
}
@keyframes hero-pulse {
  0%, 100% { opacity: 0.7; }
  50% { opacity: 1; }
}
.hero-canvas {
  position: absolute; inset: 0; width: 100%; height: 100%;
  opacity: 0.55; mix-blend-mode: screen;
}
.hero-mask {
  position: absolute; inset: 0;
  background:
    linear-gradient(180deg, rgba(10,12,15,0.45) 0%, rgba(10,12,15,0.72) 55%, var(--bg) 100%),
    linear-gradient(90deg, rgba(10,12,15,0.78) 0%, rgba(10,12,15,0.35) 48%, rgba(10,12,15,0.2) 100%);
}
.hero-content { position: relative; z-index: 1; }
@media (prefers-reduced-motion: reduce) {
  .hero-grid, .hero-glow-a, .hero-glow-b, .hero-orbit, .hero-lines path, .hero-polys {
    animation: none !important;
  }
}
.hero-kicker {
  display: inline-flex; align-items: center; gap: 0.4rem;
  font-size: 0.75rem; letter-spacing: 0.14em;
  color: var(--teal); border: 1px solid rgba(94,234,212,.35);
  padding: 0.35rem 0.75rem; border-radius: 999px; margin-bottom: 1.25rem;
}
.hero h1 {
  font-size: clamp(1.85rem, 4.8vw, 3.2rem);
  line-height: 1.2; font-weight: 700; max-width: 18ch;
}
.hero .slogan {
  margin-top: 1rem; font-size: clamp(1rem, 2.2vw, 1.25rem);
  color: var(--accent); letter-spacing: 0.06em; font-weight: 600;
}
.hero .lead {
  margin-top: 1rem; color: var(--muted); max-width: 42ch; font-size: 1.02rem;
}
.btns { display: flex; flex-wrap: wrap; gap: 0.75rem; margin-top: 1.75rem; }
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 0.85rem 1.35rem; border-radius: 999px; font-weight: 600;
  border: 1px solid transparent; transition: 0.2s ease; font-size: 0.95rem;
}
.btn-primary { background: var(--accent); color: #111; }
.btn-primary:hover { filter: brightness(1.08); }
.btn-ghost { border-color: rgba(255,255,255,.28); color: var(--text); }
.btn-ghost:hover { border-color: #fff; }

/* Sections */
section { padding: 5rem 0; }
.section-kicker {
  color: var(--accent); font-size: 0.78rem; letter-spacing: 0.16em;
  margin-bottom: 0.65rem; font-weight: 600;
}
.section-title {
  font-size: clamp(1.55rem, 3.2vw, 2.25rem); line-height: 1.25; font-weight: 700;
}
.section-lead { margin-top: 0.9rem; color: var(--muted); max-width: 52ch; }

/* About */
.about-grid {
  display: grid; gap: 2rem; margin-top: 2.5rem;
  grid-template-columns: 1.15fr 0.85fr;
}
.about-text p { color: #cfd5de; margin-bottom: 1rem; }
.about-text p:last-child { margin-bottom: 0; }
.pillars {
  display: grid; grid-template-columns: 1fr 1fr; gap: 0.75rem;
}
.pillar {
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 1.15rem 1.1rem;
}
.pillar .num { color: var(--accent); font-size: 0.75rem; letter-spacing: 0.12em; margin-bottom: 0.4rem; }
.pillar h3 { font-size: 1.05rem; margin-bottom: 0.35rem; }
.pillar p { color: var(--muted); font-size: 0.88rem; }

.creds {
  display: grid; gap: 0.85rem;
  grid-template-columns: repeat(4, 1fr); margin-top: 2.5rem;
}
.cred {
  background: linear-gradient(160deg, var(--card), #12171f);
  border: 1px solid var(--line); border-radius: var(--radius);
  padding: 1.25rem 1rem; text-align: center;
}
.cred strong {
  display: block; font-size: 1.35rem; color: var(--accent); margin-bottom: 0.35rem;
}
.cred span { color: var(--muted); font-size: 0.88rem; }

/* Cases */
.cases-head {
  display: flex; flex-wrap: wrap; align-items: end; justify-content: space-between;
  gap: 1rem; margin-bottom: 2rem;
}
.filter-tabs {
  display: flex; flex-wrap: wrap; gap: 0.45rem;
}
.filter-tabs button {
  background: transparent; border: 1px solid var(--line); color: var(--muted);
  padding: 0.4rem 0.85rem; border-radius: 999px; font-size: 0.82rem; cursor: pointer;
  font-family: inherit;
}
.filter-tabs button:hover, .filter-tabs button.active {
  color: #111; background: var(--accent); border-color: var(--accent);
}
.case-group { margin-bottom: 2.75rem; }
.case-group-title {
  font-size: 1.15rem; margin-bottom: 0.35rem; display: flex; align-items: baseline; gap: 0.75rem;
}
.case-group-title span { color: var(--muted); font-size: 0.85rem; font-weight: 400; }
.featured-grid {
  display: grid; gap: 1rem;
  grid-template-columns: repeat(3, 1fr); margin-top: 1rem;
}
.case-card {
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); overflow: hidden;
  transition: border-color 0.2s, transform 0.2s;
}
.case-card:hover { border-color: rgba(201,165,92,.4); transform: translateY(-2px); }
.case-card.wide { grid-column: span 2; }
.case-card .thumb {
  aspect-ratio: 16/10; overflow: hidden; background: #0e1218; position: relative;
}
.case-card .thumb img { width: 100%; height: 100%; object-fit: cover; }
.case-card .thumb-stack {
  display: grid; grid-template-columns: 1.4fr 1fr; gap: 0.35rem; height: 100%;
}
.case-card .thumb-stack .main { grid-row: span 2; }
.case-card .thumb-stack img { width: 100%; height: 100%; object-fit: cover; }
.case-body { padding: 1rem 1.1rem 1.2rem; }
.case-body h3 { font-size: 1.05rem; margin-bottom: 0.25rem; }
.case-body .sub { color: var(--muted); font-size: 0.88rem; }
.case-body .area {
  display: inline-block; margin-top: 0.5rem;
  color: var(--teal); font-size: 0.8rem; font-weight: 600;
}
.tags { display: flex; flex-wrap: wrap; gap: 0.35rem; margin-top: 0.65rem; }
.tag {
  font-size: 0.72rem; color: #dce2ea;
  background: rgba(255,255,255,.06); border: 1px solid var(--line);
  padding: 0.2rem 0.45rem; border-radius: 0.4rem;
}
/* Legacy text chips kept unused — all cases now render as image cards */
.text-cases { display: none; }
.case-card .thumb img[data-full] { cursor: zoom-in; }

/* Service */
.steps {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 0.85rem; margin-top: 2rem;
}
.step {
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 1.3rem 1.15rem; position: relative;
}
.step .n {
  color: var(--accent); font-size: 0.78rem; letter-spacing: 0.14em;
  font-weight: 700; margin-bottom: 0.55rem;
}
.step h3 { font-size: 1.05rem; margin-bottom: 0.45rem; }
.step p { color: var(--muted); font-size: 0.88rem; }
.guarantee {
  display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; margin-top: 2rem;
}
.g-card {
  background: var(--bg2); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 1.5rem 1.35rem;
}
.g-card h3 { margin-bottom: 0.85rem; font-size: 1.1rem; }
.g-card ul { display: grid; gap: 0.55rem; }
.g-card li {
  position: relative; padding-left: 1.15rem; color: #c9d0d9; font-size: 0.92rem;
}
.g-card li::before {
  content: ""; position: absolute; left: 0; top: 0.55rem;
  width: 0.45rem; height: 0.45rem; border-radius: 50%; background: var(--teal);
}

/* Contact */
.contact {
  background:
    radial-gradient(ellipse at 20% 0%, var(--accent-soft), transparent 50%),
    var(--bg2);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.contact-box {
  margin-top: 2rem;
  display: grid; grid-template-columns: 1.1fr 0.9fr 0.85fr; gap: 1.25rem;
  align-items: stretch;
}
.contact-main {
  background: var(--card); border: 1px solid rgba(201,165,92,.28);
  border-radius: 1.25rem; padding: 1.75rem 1.5rem;
}
.contact-main .label { color: var(--muted); font-size: 0.85rem; margin-bottom: 0.35rem; }
.contact-main .wechat {
  font-size: clamp(1.6rem, 3vw, 2.1rem); font-weight: 700;
  color: var(--accent); letter-spacing: 0.04em; margin-bottom: 0.35rem;
}
.contact-main .contact-nick { color: var(--muted); font-size: 0.9rem; margin-bottom: 0.5rem; }
.contact-main .phone {
  font-size: clamp(1.35rem, 2.6vw, 1.75rem); font-weight: 700;
  margin-bottom: 0.85rem;
}
.contact-main .phone a { color: var(--text); text-decoration: none; border-bottom: 1px solid rgba(201,165,92,.45); }
.contact-main .phone a:hover { color: var(--accent); }
.contact-main p { color: #cfd5de; margin-bottom: 0.5rem; }
.contact-qr {
  background: #fff; border: 1px solid var(--line);
  border-radius: 1.25rem; padding: 1rem 1rem 1.1rem;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  text-align: center;
}
.contact-qr img {
  width: 100%; max-width: 280px; height: auto;
  aspect-ratio: 1036 / 1326; object-fit: contain;
  border-radius: 0.5rem;
}
.contact-qr p {
  margin-top: 0.75rem; color: #333; font-size: 0.85rem; font-weight: 600;
}
.contact-side {
  background: rgba(255,255,255,.03); border: 1px solid var(--line);
  border-radius: 1.25rem; padding: 1.5rem; display: flex; flex-direction: column; justify-content: center;
}
.contact-side h3 { margin-bottom: 0.75rem; }
.contact-side p { color: var(--muted); font-size: 0.92rem; margin-bottom: 0.5rem; }
footer a { color: var(--accent); text-decoration: none; }
footer a:hover { text-decoration: underline; }

/* Footer */
footer {
  padding: 2.25rem 0 2.75rem; color: var(--muted); font-size: 0.88rem;
}
.footer-inner {
  display: flex; flex-wrap: wrap; justify-content: space-between; gap: 1rem;
}
.footer-brand strong { color: var(--text); display: block; margin-bottom: 0.35rem; }

/* Lightbox */
.lightbox {
  display: none; position: fixed; inset: 0; z-index: 200;
  background: rgba(0,0,0,.88); align-items: center; justify-content: center; padding: 1rem;
}
.lightbox.open { display: flex; }
.lightbox img {
  max-width: min(96vw, 1100px); max-height: 88vh;
  border-radius: 0.5rem; object-fit: contain;
}
.lightbox-close {
  position: absolute; top: 1rem; right: 1rem;
  background: rgba(255,255,255,.12); border: none; color: #fff;
  width: 40px; height: 40px; border-radius: 50%; cursor: pointer; font-size: 1.2rem;
}

/* Mobile drawer (from right) */
.nav-backdrop {
  display: none;
  position: fixed; inset: 0; z-index: 110;
  background: rgba(0,0,0,0.55);
  backdrop-filter: blur(2px);
}
.nav-backdrop.open { display: block; }
.nav-drawer {
  position: fixed; top: 0; right: 0; bottom: 0;
  width: min(86vw, 320px); z-index: 120;
  background: #0e1319;
  border-left: 1px solid var(--line);
  transform: translateX(100%);
  transition: transform 0.28s ease;
  display: flex; flex-direction: column;
  padding: 1.1rem 1.25rem 1.75rem;
  visibility: hidden;
}
.nav-drawer.open {
  transform: translateX(0);
  visibility: visible;
}
.nav-drawer[hidden] { display: none; }
.nav-drawer.open[hidden] { display: flex; }
.nav-drawer-head {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 1.5rem; padding-bottom: 0.85rem;
  border-bottom: 1px solid var(--line);
}
.nav-drawer-close {
  width: 40px; height: 40px; border-radius: 0.5rem;
  background: transparent; border: 1px solid var(--line);
  color: var(--text); font-size: 1.4rem; cursor: pointer; line-height: 1;
}
.nav-drawer-links {
  display: flex; flex-direction: column; gap: 0.35rem;
}
.nav-drawer-links a {
  display: block; padding: 0.85rem 0.75rem;
  color: var(--muted); font-size: 1.02rem;
  border-radius: 0.65rem;
}
.nav-drawer-links a:hover,
.nav-drawer-links a:focus-visible {
  color: var(--text); background: rgba(255,255,255,0.04);
}
.nav-drawer-cta {
  display: inline-flex; align-items: center; justify-content: center;
  margin-top: 1.5rem; /* ≥1.25rem gap from links */
  padding: 0.9rem 1.1rem; border-radius: 999px;
  background: var(--accent); color: #111; font-weight: 700; font-size: 0.95rem;
  text-align: center;
}
body.nav-locked { overflow: hidden; }

/* Responsive */
@media (max-width: 960px) {
  .about-grid, .contact-box, .guarantee { grid-template-columns: 1fr; }
  .contact-qr img { max-width: min(320px, 86vw); }
  .creds { grid-template-columns: 1fr 1fr; }
  .steps { grid-template-columns: 1fr 1fr; }
  .featured-grid { grid-template-columns: 1fr 1fr; }
  .case-card.wide { grid-column: span 2; }
}
@media (max-width: 720px) {
  .nav-links-desktop, .nav-cta-desktop { display: none; }
  .nav-toggle { display: block; }
  .featured-grid { grid-template-columns: 1fr; }
  .case-card.wide { grid-column: span 1; }
  .case-card .thumb-stack { grid-template-columns: 1fr 1fr; }
  .case-card .thumb-stack .main { grid-row: auto; grid-column: 1 / -1; aspect-ratio: 16/9; }
  .steps { grid-template-columns: 1fr; }
  .creds { grid-template-columns: 1fr 1fr; }
  .pillars { grid-template-columns: 1fr; }
  .hero { min-height: 88vh; padding-bottom: 3rem; }
  section { padding: 3.5rem 0; }
  .hero-canvas { opacity: 0.35; } /* lighter particle load on phones */
}
@media (min-width: 721px) {
  .nav-drawer, .nav-backdrop { display: none !important; }
}