/* ===== RESET & BASE ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
:root {
  --bg:        #f5f8ff;
  --bg-alt:    #eef3ff;
  --white:     #ffffff;
  --blue-deep: #1a47c8;
  --blue:      #2563eb;
  --blue-mid:  #3b82f6;
  --blue-light:#60a5fa;
  --cyan:      #0ea5e9;
  --text:      #0f172a;
  --text-sub:  #334155;
  --text-muted:#64748b;
  --border:    #dbeafe;
  --border-hover: #93c5fd;
  --shadow:    rgba(37,99,235,0.10);
  --glow:      rgba(37,99,235,0.20);
}
html { scroll-behavior: smooth; }
body {
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  overflow-x: hidden;
  line-height: 1.7;
}
a { text-decoration: none; color: inherit; }

/* ===== SCROLLBAR ===== */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-alt); }
::-webkit-scrollbar-thumb { background: var(--blue-mid); border-radius: 3px; }

/* ===== PARTICLE CANVAS ===== */
#particle-canvas {
  position: fixed; inset: 0; z-index: 0;
  pointer-events: none; opacity: 1;
}

/* ===== LAYOUT ===== */
.container { max-width: 1200px; width: 100%; margin: 0 auto; padding: 0 32px; }
section { position: relative; z-index: 1; }

/* ===== NAV ===== */
nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  height: 72px;
  background: rgba(255,255,255,0.88);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  box-shadow: 0 2px 20px rgba(37,99,235,0.06);
}
.nav-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 100%;
}
.nav-logo { display: flex; align-items: center; }
#nav-logo-canvas { display: block; height: 36px; width: auto; }
.nav-links { display: flex; gap: 36px; list-style: none; }
.nav-links a {
  font-size: 14px; letter-spacing: 0.5px; color: var(--text-muted);
  transition: color 0.25s; position: relative; padding-bottom: 3px;
}
.nav-links a::after {
  content: ''; position: absolute; bottom: 0; left: 0;
  width: 0; height: 2px;
  background: linear-gradient(90deg, var(--blue), var(--cyan));
  transition: width 0.25s; border-radius: 1px;
}
.nav-links a:hover,
.nav-links a.active { color: var(--blue); }
.nav-links a:hover::after,
.nav-links a.active::after { width: 100%; }
.nav-cta {
  padding: 9px 24px;
  background: linear-gradient(135deg, var(--blue), var(--cyan));
  border-radius: 8px; font-size: 14px; font-weight: 600; color: #fff;
  box-shadow: 0 4px 16px var(--glow);
  transition: transform 0.2s, box-shadow 0.2s;
}
.nav-cta:hover { transform: translateY(-2px); box-shadow: 0 8px 28px rgba(37,99,235,0.3); }

/* ===== HERO ===== */
#home {
  min-height: 100vh;
  display: flex; align-items: center;
  padding-top: 72px;
  background: linear-gradient(150deg, #ffffff 0%, #eff6ff 45%, #dbeafe 100%);
  overflow: hidden;
}
#home::before {
  content: '';
  position: absolute; top: -200px; right: -200px;
  width: 700px; height: 700px; border-radius: 50%;
  background: radial-gradient(circle, rgba(37,99,235,0.08) 0%, transparent 70%);
  pointer-events: none;
}
#home::after {
  content: '';
  position: absolute; bottom: -150px; left: -100px;
  width: 500px; height: 500px; border-radius: 50%;
  background: radial-gradient(circle, rgba(14,165,233,0.07) 0%, transparent 70%);
  pointer-events: none;
}
.home-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center;
}
.home-badge {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 16px; border-radius: 100px;
  background: rgba(37,99,235,0.08);
  border: 1px solid rgba(37,99,235,0.2);
  font-size: 13px; color: var(--blue); margin-bottom: 28px;
}
.home-badge-dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--cyan);
  animation: blink 1.4s ease-in-out infinite;
}
@keyframes blink { 0%,100%{opacity:1} 50%{opacity:0.2} }
.home-title {
  font-size: clamp(40px, 5vw, 68px);
  font-weight: 800; line-height: 1.18; letter-spacing: -1px;
  color: var(--text); margin-bottom: 24px;
}
.home-title .grad {
  background: linear-gradient(120deg, var(--blue-deep) 0%, var(--blue) 40%, var(--cyan) 100%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.home-sub {
  font-size: 18px; color: var(--text-muted); max-width: 480px;
  margin-bottom: 44px; line-height: 1.85;
}
.home-actions { display: flex; gap: 16px; align-items: center; }
.btn-primary {
  padding: 14px 36px;
  background: linear-gradient(135deg, var(--blue), var(--cyan));
  border-radius: 10px; font-size: 16px; font-weight: 700; color: #fff;
  box-shadow: 0 6px 24px var(--glow);
  transition: transform 0.2s, box-shadow 0.2s;
  cursor: pointer; border: none;
}
.btn-primary:hover { transform: translateY(-3px); box-shadow: 0 12px 36px rgba(37,99,235,0.3); }
.btn-outline {
  padding: 13px 28px;
  border: 1.5px solid var(--border-hover);
  border-radius: 10px; font-size: 16px; color: var(--blue);
  background: #fff; display: flex; align-items: center; gap: 8px;
  transition: border-color 0.25s, background 0.25s, transform 0.2s;
  box-shadow: 0 2px 8px var(--shadow);
}
.btn-outline:hover { border-color: var(--blue); background: rgba(37,99,235,0.04); transform: translateY(-2px); }

/* HERO VISUAL */
.home-visual {
  position: relative; display: flex; justify-content: center; align-items: center;
  /* overflow: hidden; */
}
.home-orb {
  width: 420px; height: 420px; border-radius: 50%;
  background: radial-gradient(circle at 40% 35%,
    rgba(37,99,235,0.12) 0%,
    rgba(14,165,233,0.08) 40%,
    transparent 70%);
  border: 1.5px solid rgba(37,99,235,0.15);
  position: relative; display: flex; align-items: center; justify-content: center;
  animation: orb-rotate 22s linear infinite;
}
@keyframes orb-rotate { to { transform: rotate(360deg); } }
.home-orb-inner {
  width: 260px; height: 260px; border-radius: 50%;
  background: linear-gradient(145deg, #fff 0%, #eff6ff 60%, #dbeafe 100%);
  border: 1.5px solid rgba(37,99,235,0.2);
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 4px;
  animation: orb-rotate 22s linear infinite reverse;
  box-shadow: 0 8px 48px rgba(37,99,235,0.15), inset 0 0 40px rgba(14,165,233,0.05);
}
.orb-label { font-size: 11px; color: var(--blue-mid); letter-spacing: 2.5px; text-transform: uppercase; }
.orb-title {
  font-size: 30px; font-weight: 900;
  background: linear-gradient(135deg, var(--blue-deep), var(--cyan));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.orb-sub { font-size: 12px; color: var(--text-muted); }
.orbit-ring {
  position: absolute; border-radius: 50%;
  border: 1px dashed rgba(37,99,235,0.18);
}
.orbit-ring:nth-child(1) { width: 300px; height: 300px; animation: orb-rotate 14s linear infinite; }
.orbit-ring:nth-child(2) { width: 380px; height: 380px; animation: orb-rotate 20s linear infinite reverse; }
.orbit-dot {
  position: absolute; width: 9px; height: 9px; border-radius: 50%;
  background: var(--blue); box-shadow: 0 0 10px rgba(37,99,235,0.5);
  top: 50%; left: 50%; transform: translate(-50%, -50%);
}
.orbit-wrapper {
  position: absolute; width: 360px; height: 360px;
  border-radius: 50%; animation: orb-rotate 11s linear infinite;
}
.orbit-wrapper .orbit-dot { top: 0; left: 50%; transform: translate(-50%, -50%); }
.orbit-wrapper2 {
  position: absolute; width: 420px; height: 420px;
  border-radius: 50%; animation: orb-rotate 17s linear infinite reverse;
}
.orbit-wrapper2 .orbit-dot {
  background: var(--cyan); box-shadow: 0 0 10px rgba(14,165,233,0.5);
  top: 100%; left: 50%; transform: translate(-50%, -50%);
}
.float-badge {
  position: absolute;
  background: #fff; border: 1px solid var(--border);
  border-radius: 14px; padding: 10px 16px;
  font-size: 13px; font-weight: 600; color: var(--text-sub);
  display: flex; align-items: center; gap: 8px;
  box-shadow: 0 8px 32px rgba(37,99,235,0.12);
  animation: float 3.5s ease-in-out infinite;
  white-space: nowrap;
}
.float-badge .badge-icon {
  width: 28px; height: 28px; border-radius: 8px;
  display: flex; align-items: center; justify-content: center; font-size: 14px;
}
.float-badge:nth-child(1) { top: 2%;    right: 7%; animation-delay: 0s;   }
.float-badge:nth-child(2) { top: 11%;   left: 5%; animation-delay: 0.7s; }
.float-badge:nth-child(3) { bottom: 7%; right: 6%; animation-delay: 1.4s; }
.float-badge:nth-child(4) { bottom: 6%; left: 6%;  animation-delay: 2.1s; }
@keyframes float { 0%,100%{transform:translateY(0)} 50%{transform:translateY(-10px)} }

/* hero stats */
.home-stats {
  display: flex; gap: 44px; margin-top: 56px; padding-top: 36px;
  border-top: 1px solid var(--border);
}
.home-stat-num {
  font-size: 34px; font-weight: 800;
  background: linear-gradient(120deg, var(--blue-deep), var(--blue), var(--cyan));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.home-stat-label { font-size: 13px; color: var(--text-muted); margin-top: 2px; }

/* ===== SECTION HEADERS ===== */
.section-header { text-align: center; margin-bottom: 72px; }
.section-tag {
  display: inline-block; padding: 5px 18px;
  border: 1px solid rgba(37,99,235,0.25); border-radius: 100px;
  font-size: 12px; letter-spacing: 2px; color: var(--blue);
  background: rgba(37,99,235,0.06); margin-bottom: 18px; text-transform: uppercase;
}
.section-title {
  font-size: clamp(28px, 4vw, 46px); font-weight: 800; line-height: 1.2; margin-bottom: 16px; color: var(--text);
}
.section-title .grad {
  background: linear-gradient(120deg, var(--blue-deep), var(--blue), var(--cyan));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.section-desc { font-size: 17px; color: var(--text-muted); max-width: 580px; margin: 0 auto; line-height: 1.8; }

/* ===== ABOUT ===== */
#about { padding: 130px 0; background: #fff; }
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 80px; align-items: center; }
.about-visual { position: relative; display: flex; justify-content: flex-start; }
.about-card-main {
  width: 100%; max-width: 420px;
  background: linear-gradient(145deg, #f8faff, #eff6ff);
  border: 1px solid var(--border);
  border-radius: 24px; padding: 40px;
  box-shadow: 0 8px 40px rgba(37,99,235,0.07);
}
.about-card-icon {
  width: 56px; height: 56px;
  background: linear-gradient(135deg, rgba(37,99,235,0.15), rgba(14,165,233,0.1));
  border: 1px solid rgba(37,99,235,0.2);
  border-radius: 14px; display: flex; align-items: center; justify-content: center;
  font-size: 24px; margin-bottom: 24px;
}
.about-card-main h3 { font-size: 22px; font-weight: 700; color: var(--text); margin-bottom: 14px; }
.about-card-main p { font-size: 15px; color: var(--text-muted); line-height: 1.9; }
.about-float-stat {
  position: absolute; right: 16px; bottom: 40px;
  background: #fff; border: 1px solid var(--border);
  border-radius: 16px; padding: 18px 24px;
  box-shadow: 0 12px 40px rgba(37,99,235,0.12);
  animation: float 4s ease-in-out infinite;
}
.float-stat-num {
  font-size: 32px; font-weight: 800;
  background: linear-gradient(120deg, var(--blue), var(--cyan));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.float-stat-label { font-size: 13px; color: var(--text-muted); }
.about-content h2 { font-size: 36px; font-weight: 800; margin-bottom: 20px; color: var(--text); line-height: 1.3; }
.about-content p { font-size: 16px; color: var(--text-muted); margin-bottom: 20px; line-height: 1.9; }
.about-features { display: flex; flex-direction: column; gap: 14px; margin-top: 32px; }
.about-feature {
  display: flex; align-items: flex-start; gap: 16px;
  padding: 18px 20px;
  background: #fff; border: 1px solid var(--border);
  border-radius: 14px;
  box-shadow: 0 2px 12px var(--shadow);
  transition: border-color 0.25s, transform 0.25s, box-shadow 0.25s;
}
.about-feature:hover { border-color: var(--blue-mid); transform: translateX(6px); box-shadow: 0 4px 24px rgba(37,99,235,0.12); }
.about-feature-icon {
  width: 42px; height: 42px; flex-shrink: 0;
  background: linear-gradient(135deg, rgba(37,99,235,0.12), rgba(14,165,233,0.08));
  border-radius: 10px; display: flex; align-items: center; justify-content: center; font-size: 18px;
}
.about-feature-text h4 { font-size: 15px; font-weight: 700; color: var(--text); margin-bottom: 4px; }
.about-feature-text p { font-size: 13px; color: var(--text-muted); }

/* ===== STATS ===== */
#stats {
  padding: 80px 0;
  background: linear-gradient(135deg, var(--blue-deep) 0%, var(--blue) 50%, var(--cyan) 100%);
}
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); }
.stat-item {
  text-align: center; padding: 28px;
  border-right: 1px solid rgba(255,255,255,0.18);
}
.stat-item:last-child { border-right: none; }
.stat-num { font-size: 48px; font-weight: 900; color: #fff; line-height: 1; }
.stat-unit { font-size: 22px; color: rgba(255,255,255,0.85); }
.stat-label { font-size: 14px; color: rgba(255,255,255,0.7); margin-top: 10px; }

/* ===== PRODUCTS ===== */
#products { padding: 130px 0; background: var(--bg); }
.products-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }

.product-card-wrap {
  position: relative; border-radius: 20px;
}

.product-card {
  background: #fff; border: 1px solid var(--border);
  border-radius: 20px; padding: 40px;
  position: relative; overflow: hidden; z-index: 2;
  transition: transform 0.3s, border-color 0.3s, box-shadow 0.3s;
  box-shadow: 0 4px 24px var(--shadow);
}
.product-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(90deg, var(--blue), var(--cyan));
  opacity: 0; transition: opacity 0.3s;
}
.product-card-wrap:hover .product-card { transform: translateY(-8px); border-color: transparent; box-shadow: 0 16px 56px rgba(37,99,235,0.13); }
.product-card-wrap:hover .product-card::before { opacity: 1; }
.product-number {
  position: absolute; top: 24px; right: 28px;
  font-size: 64px; font-weight: 900; color: rgba(37,99,235,0.05);
  line-height: 1; user-select: none;
}
.product-header { display: flex; align-items: center; gap: 16px; margin-bottom: 20px; }
.product-icon {
  width: 56px; height: 56px; border-radius: 16px;
  display: flex; align-items: center; justify-content: center; font-size: 26px; flex-shrink: 0;
}
.p1 { background: linear-gradient(135deg, #dbeafe, #eff6ff); border: 1px solid #bfdbfe; }
.p2 { background: linear-gradient(135deg, #ede9fe, #f5f3ff); border: 1px solid #c4b5fd; }
.p3 { background: linear-gradient(135deg, #e0f2fe, #f0f9ff); border: 1px solid #7dd3fc; }
.p4 { background: linear-gradient(135deg, #dcfce7, #f0fdf4); border: 1px solid #86efac; }
.product-name { font-size: 22px; font-weight: 800; color: var(--text); }
.product-name span { font-size: 13px; color: var(--text-muted); font-weight: 400; margin-left: 8px; }
.product-desc { font-size: 15px; color: var(--text-muted); margin-bottom: 28px; line-height: 1.85; }
.product-features { display: flex; flex-wrap: wrap; gap: 10px; }
.feature-chip {
  padding: 5px 14px;
  background: rgba(37,99,235,0.07);
  border: 1px solid rgba(37,99,235,0.15);
  border-radius: 100px; font-size: 13px; color: var(--blue);
  transition: background 0.2s;
}
.product-card-wrap:hover .feature-chip { background: rgba(37,99,235,0.12); }

/* ===== MISSION ===== */
#mission { padding: 130px 0; background: #fff; }
.mission-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.mission-card {
  background: linear-gradient(160deg, #f8faff 0%, #eff6ff 100%);
  border: 1px solid var(--border);
  border-radius: 20px; padding: 48px 36px; text-align: center;
  position: relative; overflow: hidden;
  box-shadow: 0 4px 20px var(--shadow);
  transition: transform 0.3s, box-shadow 0.3s, border-color 0.3s;
}
.mission-card:hover { transform: translateY(-8px); box-shadow: 0 16px 56px rgba(37,99,235,0.12); border-color: var(--blue-light); }
.mission-card::after {
  content: ''; position: absolute; bottom: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(90deg, transparent, var(--blue), var(--cyan), transparent);
  opacity: 0; transition: opacity 0.3s;
}
.mission-card:hover::after { opacity: 1; }
.mission-icon-wrap {
  width: 80px; height: 80px; margin: 0 auto 28px;
  border-radius: 50%;
  background: linear-gradient(135deg, rgba(37,99,235,0.15), rgba(14,165,233,0.1));
  border: 1.5px solid rgba(37,99,235,0.2);
  display: flex; align-items: center; justify-content: center; font-size: 32px;
  box-shadow: 0 4px 20px rgba(37,99,235,0.12);
}
.mission-card:nth-child(2) .mission-icon-wrap { background: linear-gradient(135deg, rgba(124,58,237,0.12), rgba(37,99,235,0.08)); border-color: rgba(124,58,237,0.2); }
.mission-card:nth-child(3) .mission-icon-wrap { background: linear-gradient(135deg, rgba(14,165,233,0.15), rgba(37,99,235,0.08)); }
.mission-sub { font-size: 12px; color: var(--blue); letter-spacing: 2px; margin-bottom: 12px; text-transform: uppercase; }
.mission-title { font-size: 20px; font-weight: 800; color: var(--text); margin-bottom: 14px; }
.mission-desc { font-size: 15px; color: var(--text-muted); line-height: 1.85; }

/* ===== CONTACT ===== */
#contact { padding: 130px 0; background: var(--bg); }
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 64px; align-items: start; }
.contact-info h2 { font-size: 38px; font-weight: 800; color: var(--text); margin-bottom: 16px; line-height: 1.25; }
.contact-info > p { font-size: 16px; color: var(--text-muted); margin-bottom: 16px; line-height: 1.85; }
.contact-items { display: flex; flex-direction: column; gap: 14px; }
.contact-item {
  display: flex; align-items: flex-start; gap: 16px;
  padding: 18px 20px;
  background: #fff; border: 1px solid var(--border);
  border-radius: 14px; box-shadow: 0 2px 10px var(--shadow);
  transition: border-color 0.25s, box-shadow 0.25s;
}
.contact-item:hover { border-color: var(--blue-mid); box-shadow: 0 4px 20px rgba(37,99,235,0.1); }
.contact-item-icon {
  width: 44px; height: 44px; flex-shrink: 0;
  background: linear-gradient(135deg, rgba(37,99,235,0.12), rgba(14,165,233,0.08));
  border-radius: 10px; display: flex; align-items: center; justify-content: center; font-size: 20px;
}
.contact-item-content h4 { font-size: 12px; color: var(--text-muted); margin-bottom: 4px; letter-spacing: 0.5px; text-transform: uppercase; }
.contact-item-content p { font-size: 15px; font-weight: 600; color: var(--text); }
.contact-form {
  background: #fff; border: 1px solid var(--border);
  border-radius: 24px; padding: 44px;
  box-shadow: 0 8px 40px rgba(37,99,235,0.08);
}
.contact-form h3 { font-size: 24px; font-weight: 700; color: var(--text); margin-bottom: 28px; }
.form-group { margin-bottom: 20px; }
.form-group label { display: block; font-size: 13px; color: var(--text-sub); margin-bottom: 8px; font-weight: 500; }
.form-group input, .form-group textarea, .form-group select {
  width: 100%; padding: 12px 16px;
  background: var(--bg); border: 1.5px solid var(--border);
  border-radius: 10px; color: var(--text); font-size: 15px;
  font-family: inherit; outline: none;
  transition: border-color 0.25s, box-shadow 0.25s;
}
.form-group input::placeholder, .form-group textarea::placeholder { color: #94a3b8; }
.form-group input:focus, .form-group textarea:focus, .form-group select:focus {
  border-color: var(--blue-mid);
  box-shadow: 0 0 0 3px rgba(37,99,235,0.1);
  background: #fff;
}
.form-group textarea { resize: vertical; min-height: 110px; }
.form-group select { cursor: pointer; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.btn-submit {
  width: 100%; padding: 14px;
  background: linear-gradient(135deg, var(--blue), var(--cyan));
  border: none; border-radius: 10px; color: #fff;
  font-size: 16px; font-weight: 700; cursor: pointer;
  box-shadow: 0 6px 24px var(--glow);
  transition: transform 0.2s, box-shadow 0.2s;
  margin-top: 8px;
}
.btn-submit:hover { transform: translateY(-2px); box-shadow: 0 12px 36px rgba(37,99,235,0.3); }

/* ===== FOOTER ===== */
footer {
  background: linear-gradient(160deg, #1e3a8a 0%, #1d4ed8 50%, #0ea5e9 100%);
  padding: 64px 0 36px; color: rgba(255,255,255,0.85);
}
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 48px; margin-bottom: 48px; }
.footer-brand p { font-size: 14px; color: rgba(255,255,255,0.6); margin-top: 16px; max-width: 280px; line-height: 1.85; }
.footer-col h4 { font-size: 13px; font-weight: 700; letter-spacing: 1.5px; text-transform: uppercase; margin-bottom: 18px; color: rgba(255,255,255,0.5); }
.footer-col ul { list-style: none; display: flex; flex-direction: column; gap: 12px; }
.footer-col ul a { font-size: 14px; color: rgba(255,255,255,0.75); transition: color 0.25s; }
.footer-col ul a:hover { color: #fff; }
.footer-bottom {
  padding-top: 28px; border-top: 1px solid rgba(255,255,255,0.12);
  display: flex; justify-content: space-between; align-items: center;
  font-size: 13px; color: rgba(255,255,255,0.45);
}

/* ===== SCROLL REVEAL ===== */
.reveal { opacity: 0; transform: translateY(28px); transition: opacity 0.65s ease, transform 0.65s ease; }
.reveal.visible { opacity: 1; transform: translateY(0); }

/* ===== HAMBURGER ===== */
.nav-hamburger {
  display: none; flex-direction: column; justify-content: center; gap: 5px;
  width: 40px; height: 40px; cursor: pointer; border: none;
  background: transparent; padding: 6px; border-radius: 8px;
  transition: background 0.2s;
}
.nav-hamburger:hover { background: rgba(37,99,235,0.07); }
.nav-hamburger span {
  display: block; height: 2px; background: var(--text-sub);
  border-radius: 2px; transition: transform 0.3s, opacity 0.3s, width 0.3s;
  transform-origin: center;
}
.nav-hamburger span:nth-child(3) { width: 65%; }
.nav-hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-hamburger.open span:nth-child(2) { opacity: 0; }
.nav-hamburger.open span:nth-child(3) { width: 100%; transform: translateY(-7px) rotate(-45deg); }

/* ===== MOBILE MENU DRAWER ===== */
.mobile-menu {
  display: none;
  position: fixed; top: 72px; left: 0; right: 0; z-index: 99;
  background: rgba(255,255,255,0.97);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  box-shadow: 0 12px 40px rgba(37,99,235,0.1);
  transform: translateY(-8px);
  opacity: 0;
  transition: opacity 0.25s ease, transform 0.25s ease;
  pointer-events: none;
}
.mobile-menu.open {
  opacity: 1; transform: translateY(0); pointer-events: auto;
}
.mobile-menu ul {
  list-style: none; padding: 16px 24px 8px;
}
.mobile-menu ul li a {
  display: flex; align-items: center; gap: 10px;
  padding: 14px 12px; font-size: 16px; font-weight: 500;
  color: var(--text-sub); border-radius: 10px;
  transition: background 0.2s, color 0.2s;
}
.mobile-menu ul li a:hover, .mobile-menu ul li a.active {
  background: rgba(37,99,235,0.07); color: var(--blue);
}
.mobile-menu ul li a .m-dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--blue-light); flex-shrink: 0;
}
.mobile-menu-footer {
  padding: 12px 24px 20px;
  border-top: 1px solid var(--border);
}
.mobile-menu-footer .btn-primary {
  display: block; text-align: center; width: 100%;
  padding: 13px; font-size: 15px;
}

/* ===== FOOTER CONTACT ===== */
.footer-contact-main a, .footer-contact-wx a { font-weight: 600; }
.footer-contact-main a { color: #fff; }
.footer-contact-wx a { color: rgba(255,255,255,0.85); }
.footer-contact-tag {
  display: inline-block; margin-left: 8px;
  padding: 1px 7px; border-radius: 100px; font-size: 11px;
  background: rgba(255,255,255,0.15); color: rgba(255,255,255,0.7);
  vertical-align: middle;
}

/* ===== BACK TO TOP ===== */
#back-top {
  position: fixed; bottom: 32px; right: 32px; z-index: 200;
  width: 44px; height: 44px; border-radius: 50%; border: none;
  background: linear-gradient(135deg, var(--blue), var(--cyan));
  color: #fff; display: flex; align-items: center; justify-content: center;
  box-shadow: 0 4px 16px rgba(37,99,235,0.35);
  cursor: pointer; opacity: 0; pointer-events: none;
  transition: opacity 0.3s, transform 0.3s;
}
#back-top.visible { opacity: 1; pointer-events: auto; }
#back-top:hover { transform: translateY(-3px); box-shadow: 0 8px 24px rgba(37,99,235,0.45); }

/* ===== RESPONSIVE ===== */
@media (max-width: 960px) {
  .home-grid, .about-grid, .contact-grid { grid-template-columns: 1fr; }
  .home-visual { display: none; }
  .products-grid, .mission-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .nav-links { display: none; }
  .nav-cta { display: none; }
  .nav-hamburger { display: flex; }
  .mobile-menu { display: block; }
}