/* ========= 基础重置 ========= */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
:root {
  --bg:        #0a0e1a;
  --bg2:       #0d1220;
  --bg3:       #111827;
  --accent:    #4f8ef7;
  --accent2:   #7c3aed;
  --accent3:   #06b6d4;
  --text:      #e2e8f0;
  --text-muted:#8892a4;
  --border:    rgba(79,142,247,.18);
  --card-bg:   rgba(255,255,255,.03);
  --radius:    12px;
  --transition:.3s ease;
}
html { scroll-behavior: smooth; }
body {
  font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; }

/* ========= 滚动条 ========= */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--accent); border-radius: 3px; }

/* ========= 粒子背景画布 ========= */
#particles { position: fixed; top:0; left:0; width:100%; height:100%; z-index:0; pointer-events:none; }

/* ========= 导航 ========= */
nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 6vw;
  height: 68px;
  background: rgba(10,14,26,.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: background var(--transition);
}
nav.scrolled { background: rgba(10,14,26,.97); }
.nav-logo {
  display: flex; align-items: center; gap: 10px;
  font-size: 1.15rem; font-weight: 700; letter-spacing: .5px;
}
.nav-logo .logo-icon {
  width: 38px; height: 38px;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.1rem; font-weight: 900; color: #fff;
}
.nav-links { display: flex; gap: 36px; }
.nav-links a {
  font-size: .92rem; color: var(--text-muted);
  position: relative; padding-bottom: 4px;
  transition: color var(--transition);
}
.nav-links a::after {
  content:''; position:absolute; bottom:0; left:0;
  width:0; height:2px;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  border-radius: 2px;
  transition: width var(--transition);
}
.nav-links a:hover, .nav-links a.active { color: var(--text); }
.nav-links a:hover::after, .nav-links a.active::after { width: 100%; }

/* ========= 导航工具下拉菜单 ========= */
.nav-tools-dropdown {
  position: relative;
  display: flex;
  align-items: center;
}
.nav-tools-btn {
  font-size: .92rem; color: var(--text-muted);
  position: relative; padding-bottom: 4px;
  cursor: pointer;
  transition: color var(--transition);
  white-space: nowrap;
  user-select: none;
}
.nav-tools-btn::after {
  content:''; position:absolute; bottom:0; left:0;
  width:0; height:2px;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  border-radius: 2px;
  transition: width var(--transition);
}
.nav-tools-dropdown:hover .nav-tools-btn,
.nav-tools-dropdown.open .nav-tools-btn { color: var(--text); }
.nav-tools-dropdown:hover .nav-tools-btn::after,
.nav-tools-dropdown.open .nav-tools-btn::after { width: 100%; }
.tools-arrow {
  display: inline-block;
  font-size: .7rem;
  margin-left: 3px;
  transition: transform var(--transition);
  vertical-align: middle;
}
.nav-tools-dropdown.open .tools-arrow { transform: rotate(180deg); }
.nav-tools-menu {
  display: none;
  position: absolute;
  top: calc(100% + 14px);
  left: 50%;
  transform: translateX(-50%);
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  min-width: 200px;
  padding: 6px 0;
  box-shadow: 0 8px 32px rgba(0,0,0,.4);
  z-index: 1000;
  overflow: hidden;
}
.nav-tools-dropdown.open .nav-tools-menu { display: block; }
.nav-tools-menu a {
  display: flex;
  align-items: center;
  padding: 10px 18px;
  font-size: .88rem;
  color: var(--text-muted);
  text-decoration: none;
  transition: background var(--transition), color var(--transition);
  white-space: nowrap;
}
.nav-tools-menu a::after { display: none; }
.nav-tools-menu a:hover {
  background: rgba(6,182,212,.08);
  color: var(--accent);
}
.nav-cta {
  padding: 8px 22px; border-radius: 6px; font-size: .88rem; font-weight: 600;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: #fff; cursor: pointer; border: none;
  transition: opacity var(--transition), transform var(--transition);
}
.nav-cta:hover { opacity: .85; transform: translateY(-1px); }
.menu-toggle { display:none; flex-direction:column; gap:5px; cursor:pointer; }
.menu-toggle span { display:block; width:24px; height:2px; background:var(--text); border-radius:2px; transition: var(--transition); }

/* ========= 语言切换器 ========= */
.lang-switcher {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  border-radius: 6px;
  font-size: .85rem;
  font-weight: 500;
  color: var(--text-muted);
  background: rgba(255,255,255,.05);
  border: 1px solid var(--border);
  cursor: pointer;
  transition: all var(--transition);
  user-select: none;
  margin-right: 16px;
}
.lang-switcher:hover {
  background: rgba(79,142,247,.12);
  border-color: rgba(79,142,247,.35);
  color: var(--text);
}
.lang-switcher .current-lang {
  display: flex;
  align-items: center;
  gap: 6px;
}
.lang-switcher .lang-icon { font-size: 1rem; }
.lang-switcher .arrow {
  font-size: .7rem;
  transition: transform var(--transition);
}
.lang-switcher.active .arrow { transform: rotate(180deg); }
.lang-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  min-width: 140px;
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 8px;
  box-shadow: 0 12px 40px rgba(0,0,0,.5);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: all .25s ease;
  z-index: 1000;
}
.lang-switcher.active .lang-dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.lang-dropdown::before {
  content: '';
  position: absolute;
  top: -6px;
  right: 20px;
  width: 10px;
  height: 10px;
  background: var(--bg3);
  border-left: 1px solid var(--border);
  border-top: 1px solid var(--border);
  transform: rotate(45deg);
}
.lang-option {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border-radius: 8px;
  font-size: .88rem;
  color: var(--text-muted);
  cursor: pointer;
  transition: all var(--transition);
}
.lang-option:hover {
  background: rgba(79,142,247,.15);
  color: var(--text);
}
.lang-option.active {
  background: rgba(79,142,247,.2);
  color: var(--accent);
}
.lang-option .opt-icon { font-size: 1.1rem; }
@media(max-width: 900px) {
  .lang-switcher {
    margin: 0 6vw 16px;
    width: auto;
    max-width: 200px;
  }
  .lang-dropdown {
    position: static;
    box-shadow: none;
    border: none;
    padding: 0 0 0 20px;
    opacity: 1;
    visibility: visible;
    transform: none;
    display: none;
  }
  .lang-switcher.mobile-open .lang-dropdown { display: block; }
  .lang-dropdown::before { display: none; }
}

/* ========= 公共 ========= */
section { position: relative; z-index: 1; scroll-margin-top: 68px; }
.section-inner { max-width: 1200px; margin: 0 auto; padding: 0 6vw; }
.section-tag {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 5px 14px; border-radius: 20px; font-size: .78rem; font-weight: 600;
  background: rgba(79,142,247,.12); color: var(--accent);
  border: 1px solid rgba(79,142,247,.25);
  letter-spacing: .5px; text-transform: uppercase;
  margin-bottom: 16px;
}
.section-title {
  font-size: clamp(1.7rem, 3.5vw, 2.6rem); font-weight: 800; line-height: 1.25;
  background: linear-gradient(135deg, #fff 30%, var(--accent));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 16px;
}
.section-subtitle { color: var(--text-muted); font-size: 1rem; max-width: 560px; }
.gradient-line {
  width: 60px; height: 3px; border-radius: 2px;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  margin: 16px 0 40px;
}

/* ========= HERO ========= */
#hero {
  min-height: 100vh;
  display: flex; align-items: center;
  background: radial-gradient(ellipse 80% 60% at 50% 0%, rgba(79,142,247,.15) 0%, transparent 70%),
              radial-gradient(ellipse 50% 50% at 80% 60%, rgba(124,58,237,.1) 0%, transparent 60%),
              var(--bg);
  padding-top: 68px;
}
.hero-inner {
  max-width: 1200px; margin: 0 auto; padding: 80px 6vw;
  display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center;
}
.hero-content { max-width: 100%; overflow: hidden; }
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 16px; border-radius: 20px; font-size: .8rem; font-weight: 600;
  background: rgba(6,182,212,.1); color: var(--accent3);
  border: 1px solid rgba(6,182,212,.25); margin-bottom: 24px;
}
.hero-badge .dot { width:6px;height:6px;border-radius:50%;background:var(--accent3);animation:pulse 1.6s infinite; }
.hero-title {
  font-size: clamp(1.8rem, 4vw, 3rem); font-weight: 900; line-height: 1.2;
  margin-bottom: 20px;
  max-width: 100%;
  overflow-wrap: break-word;
}
.hero-title .gradient {
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent2) 50%, var(--accent3) 100%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
  word-break: break-word;
  overflow-wrap: break-word;
  max-width: 100%;
}
.hero-desc { color: var(--text-muted); font-size: 1.05rem; line-height: 1.8; margin-bottom: 36px; max-width: 480px; }
.hero-btns { display: flex; gap: 16px; flex-wrap: wrap; }
.btn-primary {
  padding: 13px 32px; border-radius: 8px; font-size: .95rem; font-weight: 600;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: #fff; border: none; cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition);
  box-shadow: 0 0 20px rgba(79,142,247,.3);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 30px rgba(79,142,247,.45); }
.btn-outline {
  padding: 13px 32px; border-radius: 8px; font-size: .95rem; font-weight: 600;
  background: transparent; color: var(--text);
  border: 1px solid var(--border); cursor: pointer;
  transition: border-color var(--transition), background var(--transition);
}
.btn-outline:hover { border-color: var(--accent); background: rgba(79,142,247,.08); }
.hero-stats { display: flex; gap: 32px; margin-top: 48px; flex-wrap: wrap; }
.stat { text-align: center; }
.stat-num { font-size: 1.8rem; font-weight: 800; background: linear-gradient(135deg, var(--accent), var(--accent3)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.stat-label { font-size: .78rem; color: var(--text-muted); margin-top: 2px; }
/* 右侧技术卡片 */
.hero-visual { position: relative; display: flex; align-items: center; justify-content: center; }
.hero-card {
  width: 100%; max-width: 420px;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 28px;
  backdrop-filter: blur(8px);
  box-shadow: 0 0 60px rgba(79,142,247,.1);
}
.card-header { display: flex; align-items: center; gap: 8px; margin-bottom: 20px; }
.card-dot { width:10px;height:10px;border-radius:50%; }
.card-dot.red{background:#ff5f57;} .card-dot.yellow{background:#febc2e;} .card-dot.green{background:#28c840;}
.code-line { font-family: 'Courier New', monospace; font-size: .82rem; line-height: 1.8; }
.code-line .kw  { color: #c792ea; }
.code-line .fn  { color: #82aaff; }
.code-line .str { color: #c3e88d; }
.code-line .cmt { color: #546e7a; }
.code-line .num { color: #f78c6c; }
.typing-cursor {
  display: inline-block;
  width: 2px; height: .85em;
  background: var(--accent);
  margin-left: 2px;
  vertical-align: text-bottom;
  animation: blink 1.1s step-start infinite;
}
@keyframes blink {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0; }
}
.floating-badge {
  position: absolute;
  background: rgba(13,18,32,.9); border: 1px solid var(--border);
  border-radius: 10px; padding: 10px 16px; backdrop-filter: blur(8px);
  font-size: .8rem; white-space: nowrap;
}
.floating-badge.top-right { top: -16px; right: -16px; }
.floating-badge.bottom-left { bottom: -16px; left: -16px; }
.floating-badge .fb-icon { font-size: 1.1rem; margin-right: 6px; }

/* ========= 服务 ========= */
#services { padding: 100px 0; background: var(--bg2); }
.services-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 24px;
  margin-top: 0;
}
.service-card {
  background: var(--card-bg); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 32px 28px;
  transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
  cursor: default;
  position: relative; overflow: hidden;
}
.service-card::before {
  content:''; position:absolute; top:0; left:0; right:0; height:2px;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  transform: scaleX(0); transform-origin: left;
  transition: transform var(--transition);
}
.service-card:hover { border-color: rgba(79,142,247,.4); transform: translateY(-4px); box-shadow: 0 16px 40px rgba(0,0,0,.4); }
.service-card:hover::before { transform: scaleX(1); }
.service-icon {
  width: 52px; height: 52px; border-radius: 12px; margin-bottom: 20px;
  display: flex; align-items: center; justify-content: center; font-size: 1.4rem;
  background: linear-gradient(135deg, rgba(79,142,247,.15), rgba(124,58,237,.15));
  border: 1px solid rgba(79,142,247,.2);
}
.service-title { font-size: 1.1rem; font-weight: 700; margin-bottom: 10px; }
.service-desc { font-size: .88rem; color: var(--text-muted); line-height: 1.7; }
.service-tags { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 16px; }
.tag {
  padding: 3px 10px; border-radius: 12px; font-size: .72rem;
  background: rgba(79,142,247,.1); color: var(--accent); border: 1px solid rgba(79,142,247,.2);
}

/* ========= 关于我们 ========= */
#about { padding: 100px 0; background: var(--bg); }
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 80px; align-items: center; }
.about-feature { display: flex; gap: 16px; margin-bottom: 28px; align-items: flex-start; }
.about-feature-icon {
  width: 44px; height: 44px; border-radius: 10px; flex-shrink: 0;
  display: flex; align-items: center; justify-content: center; font-size: 1.2rem;
  background: linear-gradient(135deg, rgba(79,142,247,.2), rgba(124,58,237,.2));
  border: 1px solid rgba(79,142,247,.25);
}
.about-feature-title { font-size: .98rem; font-weight: 700; margin-bottom: 4px; }
.about-feature-desc { font-size: .85rem; color: var(--text-muted); }
.about-visual { position: relative; }
.about-card-main {
  background: linear-gradient(135deg, rgba(79,142,247,.08), rgba(124,58,237,.08));
  border: 1px solid var(--border); border-radius: 20px; padding: 36px;
}
.about-ring {
  width: 180px; height: 180px; border-radius: 50%;
  background: conic-gradient(var(--accent) 0% 35%, var(--accent2) 35% 65%, var(--accent3) 65% 85%, rgba(255,255,255,.08) 85%);
  display: flex; align-items: center; justify-content: center;
  margin: 0 auto 24px; position: relative;
}
.about-ring::after {
  content:''; position:absolute; inset:16px; border-radius:50%; background: var(--bg);
}
.about-ring-label {
  position: relative; z-index: 1; text-align: center;
  font-size: 1.4rem; font-weight: 800;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.legend { display: flex; flex-direction: column; gap: 10px; }
.legend-item { display: flex; align-items: center; gap: 10px; font-size: .85rem; color: var(--text-muted); }
.legend-dot { width: 10px; height: 10px; border-radius: 50%; flex-shrink: 0; }
.team-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 16px; margin-top: 20px; }
.team-card {
  background: var(--card-bg); border: 1px solid var(--border); border-radius: 10px;
  padding: 16px; text-align: center;
  transition: border-color var(--transition);
}
.team-card:hover { border-color: var(--accent); }
.team-avatar {
  width: 48px; height: 48px; border-radius: 50%; margin: 0 auto 10px;
  display: flex; align-items: center; justify-content: center; font-size: 1.3rem;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
}
.team-name { font-size: .85rem; font-weight: 700; }
.team-role { font-size: .75rem; color: var(--text-muted); margin-top: 2px; }

/* ========= 联系我们 ========= */
#contact { padding: 100px 0; background: var(--bg2); }
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; }
.contact-info-item { display: flex; gap: 16px; margin-bottom: 28px; align-items: flex-start; }
.contact-icon {
  width: 44px; height: 44px; border-radius: 10px; flex-shrink: 0;
  display: flex; align-items: center; justify-content: center; font-size: 1.2rem;
  background: linear-gradient(135deg, rgba(79,142,247,.2), rgba(6,182,212,.2));
  border: 1px solid rgba(79,142,247,.25);
}
.contact-info-title { font-size: .85rem; color: var(--text-muted); margin-bottom: 4px; }
.contact-info-val { font-size: .98rem; font-weight: 600; }
.form-group { margin-bottom: 18px; }
.form-group label { display: block; font-size: .85rem; color: var(--text-muted); margin-bottom: 6px; }
.form-group input, .form-group textarea, .form-group select {
  width: 100%; padding: 11px 14px; border-radius: 8px;
  background: rgba(255,255,255,.04); border: 1px solid var(--border);
  color: var(--text); font-size: .9rem; font-family: inherit;
  outline: none; transition: border-color var(--transition), box-shadow var(--transition);
}
.form-group input:focus, .form-group textarea:focus, .form-group select:focus {
  border-color: var(--accent); box-shadow: 0 0 0 3px rgba(79,142,247,.12);
}
.form-group select option { background: var(--bg3); }
.form-group textarea { resize: vertical; min-height: 100px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.submit-btn {
  width: 100%; padding: 13px; border-radius: 8px; border: none; cursor: pointer;
  font-size: .95rem; font-weight: 700; color: #fff;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  transition: opacity var(--transition), transform var(--transition);
}
.submit-btn:hover { opacity: .88; transform: translateY(-1px); }

/* ========= 页脚 ========= */
footer {
  background: var(--bg); border-top: 1px solid var(--border);
  padding: 20px 6vw; text-align: center;
}
.footer-logo { font-size: 1rem; font-weight: 700; margin-bottom: 8px; }
.footer-sub { font-size: .8rem; color: var(--text-muted); }
.footer-links { display: flex; justify-content: center; gap: 24px; margin: 16px 0; flex-wrap: wrap; }
.footer-links a { font-size: .82rem; color: var(--text-muted); transition: color var(--transition); }
.footer-links a:hover { color: var(--accent); }
.icp { font-size: .75rem; color: var(--text-muted); margin-top: 8px; opacity: .6; }

/* ========= 动画 ========= */
@keyframes pulse { 0%,100%{opacity:1;} 50%{opacity:.4;} }
@keyframes fadeInUp { from{opacity:0;transform:translateY(30px);} to{opacity:1;transform:translateY(0);} }
@keyframes breathe { 0%,100%{box-shadow:0 6px 24px rgba(79,142,247,.4);transform:scale(1);} 50%{box-shadow:0 10px 40px rgba(79,142,247,.6);transform:scale(1.05);} }
@keyframes float { 0%,100%{transform:translateY(0);} 50%{transform:translateY(-10px);} }
@keyframes textBreathe { 0%,100%{transform:scale(1);filter:brightness(1);} 50%{transform:scale(1.12);filter:brightness(1.3);} }
.hero-visual { animation: float 6s ease-in-out infinite; }
.fade-in { opacity:0; transform:translateY(24px); transition: opacity .6s ease, transform .6s ease; }
.fade-in.visible { opacity:1; transform:translateY(0); }

/* ========= 滚动进度条 ========= */
#progress { position:fixed; top:0; left:0; height:2px; background:linear-gradient(90deg,var(--accent),var(--accent2)); z-index:200; width:0%; transition:width .1s; }

/* ========= 回到顶部按钮 ========= */
#back-top {
  position: fixed;
  right: 28px;
  bottom: 36px;
  z-index: 200;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: #fff;
  box-shadow: 0 4px 20px rgba(79,142,247,.45);
  opacity: 0;
  transform: translateY(12px);
  white-space: nowrap;
}
  transition: opacity .3s ease, transform .3s ease, box-shadow .2s ease;
  pointer-events: none;
}
#back-top.show {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}
#back-top:hover {
  box-shadow: 0 6px 28px rgba(79,142,247,.7);
  transform: translateY(-2px);
}
#back-top:active { transform: translateY(0); }

/* ========= 响应式 ========= */

/* 平板端 768px - 900px */
@media(max-width:900px){
  .hero-inner,.about-grid,.contact-grid { grid-template-columns:1fr; }
  .hero-visual { display:none; }
  .hero-stats { justify-content: flex-start; }
  
  /* 导航 */
  .nav-links,.nav-cta { display:none; }
  .menu-toggle { display:flex; }
  nav { padding: 0 4vw; }
  nav.open .nav-links {
    display:flex; flex-direction:column; position:absolute; top:68px; left:0; right:0;
    background:rgba(10,14,26,.97); padding:20px 4vw; gap:20px; border-bottom:1px solid var(--border);
    z-index: 99;
  }
  nav.open .nav-cta { 
    display:block; position:absolute; top:calc(68px + 180px); left:4vw; right:4vw; 
    text-align: center;
  }
  
  /* 语言切换器 - 移动端跟随菜单显示 */
  .lang-switcher {
    display: none;
    margin: 0 4vw 12px !important;
    width: fit-content;
  }
  nav.open .lang-switcher {
    display: inline-flex;
    position: relative !important;
    top: auto !important; left: auto !important; right: auto !important;
  }
  .lang-dropdown {
    position: static !important;
    box-shadow: none !important;
    border: none !important;
    padding: 0 0 0 16px !important;
    opacity: 1 !important;
    visibility: visible !important;
    transform: none !important;
    display: none;
  }
  .lang-switcher.mobile-open .lang-dropdown { display: block; }
  .lang-dropdown::before { display: none; }
  
  /* 网格布局 */
  .team-grid { grid-template-columns: repeat(2,1fr); }
  .form-row { grid-template-columns:1fr; }
  
  /* 覆盖内联样式 */
  #cases .fade-in[style*="grid-template-columns:repeat(3"] { grid-template-columns:repeat(2,1fr) !important; }
  #tech .fade-in[style*="grid-template-columns:repeat(3"] { grid-template-columns:repeat(2,1fr) !important; }
  #about .fade-in[style*="grid-template-columns:1fr 1fr"] { grid-template-columns:1fr !important; }
  #about .fade-in[style*="grid-template-columns:repeat(2"] { grid-template-columns:1fr !important; }
  #services .fade-in[style*="flex-wrap:wrap"] { gap: 16px !important; }
  #partners .fade-in[style*="flex-wrap:wrap"] { gap: 16px !important; }
  #process .fade-in[style*="flex-wrap:wrap"] { gap: 16px !important; }
  #contact .contact-cards { flex-direction: column !important; align-items: stretch !important; }
  
  /* 间距调整 */
  .section-inner { padding: 0 4vw; }
  section { padding: 60px 0; }
  .section-title { font-size: 1.8rem; }
  .section-subtitle { font-size: 0.95rem; }
  
  /* 服务卡片 */
  .services-grid { grid-template-columns: repeat(2,1fr) !important; gap: 16px; }
  
  /* 案例卡片 */
  .cases-grid { grid-template-columns: repeat(2,1fr) !important; gap: 16px; }
  
  /* 技术栈 */
  .tech-grid { grid-template-columns: repeat(2,1fr) !important; }
  
  /* 关于我们 */
  .about-features { grid-template-columns: repeat(2,1fr) !important; }
  
  /* 流程 */
  .process-steps { grid-template-columns: repeat(2,1fr) !important; }
  
  /* 表单 */
  .contact-form { padding: 24px; }
  .form-row input, .form-row select { padding: 12px 14px; }
  textarea { min-height: 120px; }
  
  /* 页脚 */
  .footer-links { flex-wrap: wrap; }
  .footer-links a { padding: 6px 12px; font-size: 0.85rem; }
}

/* 手机端 600px 以下 */
@media(max-width:600px){
  /* Hero */
  .hero-inner { padding: 60px 4vw; gap: 32px; }
  .hero-badge { font-size: 0.75rem; padding: 4px 12px; }
  .hero-title { font-size: 1.6rem; }
  .hero-desc { font-size: 0.95rem; max-width: 100%; }
  .hero-btns { flex-direction: column; gap: 12px; }
  .hero-btns button { width: 100%; padding: 14px 20px; }
  .hero-stats { gap: 20px; }
  .stat-num { font-size: 1.5rem; }
  
  /* 导航 */
  nav.open .nav-links { gap: 16px; }
  nav.open .nav-cta { top: calc(68px + 160px); left: 4vw; right: 4vw; }
  nav.open .lang-switcher { display: inline-flex !important; }
  
  /* 覆盖内联样式 */
  #cases .fade-in[style*="grid-template-columns:repeat(2"] { grid-template-columns:1fr !important; }
  #cases .fade-in[style*="grid-template-columns:repeat(3"] { grid-template-columns:1fr !important; }
  #tech .fade-in[style*="grid-template-columns:repeat(2"] { grid-template-columns:1fr !important; }
  #tech .fade-in[style*="grid-template-columns:repeat(3"] { grid-template-columns:1fr !important; }
  #about .fade-in[style*="grid-template-columns"] { grid-template-columns:1fr !important; }
  #partners .fade-in[style*="flex-wrap:wrap"] { gap: 12px !important; padding: 12px !important; }
  #process .fade-in[style*="flex-wrap:wrap"] { gap: 16px !important; }
  #contact .contact-cards { gap: 16px !important; }
  #contact .contact-cards .contact-card { padding: 20px !important; }
  
  /* 微信弹框 */
  #wechat-modal { padding: 16px !important; }
  #wechat-modal > div { 
    max-width: calc(100vw - 32px) !important; 
    width: auto !important;
    padding: 28px 24px !important;
  }
  #wechat-modal img { width: 150px !important; height: 150px !important; }
  #wechat-modal [style*="width:170px"] { width: 150px !important; height: 150px !important; }
  
  /* 标题 */
  .section-title { font-size: 1.5rem; }
  .section-subtitle { font-size: 0.9rem; }
  section { padding: 50px 0; }
  
  /* 服务卡片 */
  .services-grid { grid-template-columns:1fr !important; }
  .service-card { padding: 20px; }
  .service-icon { width: 48px; height: 48px; font-size: 1.4rem; }
  .service-card h3 { font-size: 1.05rem; }
  .service-card p { font-size: 0.88rem; }
  
  /* 案例卡片 */
  .cases-grid { grid-template-columns:1fr !important; }
  .case-card { padding: 16px; }
  
  /* 技术栈 */
  .tech-grid { grid-template-columns:1fr !important; }
  .tech-card { padding: 20px; }
  
  /* 团队 */
  .team-grid { grid-template-columns:1fr !important; }
  .team-card { padding: 20px; }
  .team-avatar { width: 64px; height: 64px; font-size: 1.6rem; }
  
  /* 流程 */
  .process-steps { grid-template-columns:1fr !important; }
  .step { padding: 20px; }
  .step-num { width: 40px; height: 40px; font-size: 1rem; }
  .step h3 { font-size: 1rem; }
  
  /* 关于我们 */
  .about-features { grid-template-columns:1fr !important; }
  .feature-item { padding: 16px; }
  .feature-icon { width: 44px; height: 44px; font-size: 1.2rem; }
  
  /* 合作伙伴 */
  .partners-grid { grid-template-columns: repeat(3,1fr) !important; }
  #partners .fade-in[style*="grid-template-columns"] { grid-template-columns: repeat(3,1fr) !important; }
  
  /* 表单 */
  .contact-grid { gap: 24px; }
  .contact-form { padding: 20px; }
  .form-row { gap: 12px; }
  
  /* 回到顶部 */
  #back-top { right: 16px; bottom: 20px; width: 42px; height: 42px; }
  
  /* 页脚 */
  .footer-links { gap: 8px; }
  .footer-links a { padding: 4px 8px; font-size: 0.8rem; }
}

/* 超小屏幕 400px 以下 */
@media(max-width:400px){
  .hero-title { font-size: 1.4rem; }
  .section-title { font-size: 1.3rem; }
  .hero-stats { flex-direction: column; align-items: flex-start; gap: 12px; }
  .partners-grid { grid-template-columns: repeat(2,1fr) !important; }
}