/* =========================================================
   悠哉网络科技官网 - 主样式
   主题：深色赛博科技
   ========================================================= */

/* ---------- 变量 ---------- */
:root {
  --bg-0: #050816;
  --bg-1: #0a0e27;
  --bg-2: #0f1438;
  --panel: rgba(15, 20, 56, 0.55);
  --panel-border: rgba(0, 240, 255, 0.18);
  --cyan: #00f0ff;
  --violet: #b026ff;
  --pink: #ff2d92;
  --green: #00ffa3;
  --text: #e0e6ff;
  --text-dim: #8b95b8;
  --text-mute: #5a6485;
  --grid-line: rgba(0, 240, 255, 0.06);
  --glow-cyan: 0 0 24px rgba(0, 240, 255, 0.45);
  --glow-violet: 0 0 24px rgba(176, 38, 255, 0.45);
  --font-display: 'Orbitron', sans-serif;
  --font-body: 'IBM Plex Sans', 'Noto Sans SC', sans-serif;
  --font-cn: 'Noto Sans SC', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  --maxw: 1200px;
}

/* ---------- 重置 ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-body);
  background: var(--bg-0);
  color: var(--text);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
ul { list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }

::selection { background: var(--cyan); color: var(--bg-0); }

/* 滚动条 */
::-webkit-scrollbar { width: 10px; }
::-webkit-scrollbar-track { background: var(--bg-0); }
::-webkit-scrollbar-thumb { background: linear-gradient(var(--cyan), var(--violet)); border-radius: 5px; }

/* ---------- 布局 ---------- */
.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
section { position: relative; }

.section { padding: 120px 0; }
.section-head { margin-bottom: 64px; }
.section-label {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.2em;
  color: var(--cyan);
  text-transform: uppercase;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
}
.section-label::before {
  content: '';
  width: 32px; height: 1px;
  background: var(--cyan);
  box-shadow: var(--glow-cyan);
}
.section-title {
  font-family: var(--font-display);
  font-size: clamp(28px, 4vw, 48px);
  font-weight: 800;
  letter-spacing: 0.02em;
  line-height: 1.1;
}
.section-sub {
  margin-top: 14px;
  color: var(--text-dim);
  font-size: 16px;
  font-family: var(--font-cn);
}

/* ---------- 背景特效 ---------- */
.bg-grid {
  position: fixed; inset: 0; z-index: -2;
  background:
    linear-gradient(var(--grid-line) 1px, transparent 1px) 0 0 / 50px 50px,
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px) 0 0 / 50px 50px,
    radial-gradient(ellipse at 20% 0%, rgba(176, 38, 255, 0.12), transparent 50%),
    radial-gradient(ellipse at 80% 100%, rgba(0, 240, 255, 0.10), transparent 50%),
    var(--bg-0);
  animation: gridPan 30s linear infinite;
}
@keyframes gridPan {
  from { background-position: 0 0, 0 0, 0 0, 0 0, 0 0; }
  to { background-position: 50px 50px, 50px 50px, 0 0, 0 0, 0 0; }
}
.bg-noise {
  position: fixed; inset: 0; z-index: -1; pointer-events: none;
  opacity: 0.04;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='200' height='200'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='3'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}
.orb {
  position: absolute; border-radius: 50%; filter: blur(60px);
  pointer-events: none; z-index: 0;
}

/* ---------- 导航 ---------- */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  padding: 18px 0;
  transition: all 0.3s ease;
  border-bottom: 1px solid transparent;
}
.nav.scrolled {
  padding: 12px 0;
  background: rgba(5, 8, 22, 0.85);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--panel-border);
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; }
.logo { display: flex; align-items: center; gap: 12px; }
.logo-mark {
  width: 40px; height: 40px;
  display: grid; place-items: center;
  border: 1px solid var(--cyan);
  border-radius: 8px;
  background: rgba(0, 240, 255, 0.08);
  box-shadow: var(--glow-cyan);
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 18px;
  color: var(--cyan);
}
.logo-text {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  letter-spacing: 0.08em;
}
.logo-text small { display: block; font-family: var(--font-mono); font-size: 9px; color: var(--text-mute); letter-spacing: 0.2em; }
.nav-links { display: flex; align-items: center; gap: 36px; }
.nav-links a {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--text-dim);
  text-transform: uppercase;
  position: relative;
  transition: color 0.2s;
}
.nav-links a::after {
  content: ''; position: absolute; left: 0; bottom: -6px;
  width: 0; height: 1px; background: var(--cyan);
  box-shadow: var(--glow-cyan);
  transition: width 0.3s;
}
.nav-links a:hover, .nav-links a.active { color: var(--cyan); }
.nav-links a:hover::after, .nav-links a.active::after { width: 100%; }
.nav-cta {
  font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.1em;
  padding: 9px 20px; border: 1px solid var(--cyan); color: var(--cyan);
  border-radius: 4px; text-transform: uppercase;
  transition: all 0.25s;
}
.nav-cta:hover { background: var(--cyan); color: var(--bg-0); box-shadow: var(--glow-cyan); }
.nav-toggle { display: none; flex-direction: column; gap: 5px; padding: 6px; }
.nav-toggle span { width: 24px; height: 2px; background: var(--cyan); transition: 0.3s; }
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- Hero ---------- */
.hero {
  min-height: 100vh; display: flex; align-items: center;
  position: relative; overflow: hidden;
  padding: 120px 0 80px;
}
.hero .orb-1 { width: 500px; height: 500px; background: rgba(0, 240, 255, 0.18); top: -100px; right: -100px; animation: float1 14s ease-in-out infinite; }
.hero .orb-2 { width: 450px; height: 450px; background: rgba(176, 38, 255, 0.20); bottom: -120px; left: -120px; animation: float2 18s ease-in-out infinite; }
.hero .orb-3 { width: 300px; height: 300px; background: rgba(255, 45, 146, 0.12); top: 40%; left: 50%; animation: float3 16s ease-in-out infinite; }
@keyframes float1 { 0%,100% { transform: translate(0,0); } 50% { transform: translate(-40px, 40px); } }
@keyframes float2 { 0%,100% { transform: translate(0,0); } 50% { transform: translate(50px, -30px); } }
@keyframes float3 { 0%,100% { transform: translate(-50%,-50%); } 50% { transform: translate(-30%, -60%); } }

.hero-inner { position: relative; z-index: 2; max-width: 880px; }
.hero-tag {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.18em;
  color: var(--cyan); text-transform: uppercase;
  padding: 8px 16px; border: 1px solid var(--panel-border);
  border-radius: 30px; background: rgba(0, 240, 255, 0.05);
  margin-bottom: 32px;
}
.hero-tag .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--green); box-shadow: 0 0 10px var(--green); animation: pulse 2s infinite; }
@keyframes pulse { 0%,100% { opacity: 1; } 50% { opacity: 0.4; } }

.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(40px, 8vw, 88px);
  font-weight: 900;
  line-height: 1.05;
  letter-spacing: 0.01em;
  margin-bottom: 8px;
}
.hero h1 .grad {
  background: linear-gradient(120deg, var(--cyan) 0%, var(--violet) 60%, var(--pink) 100%);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
  filter: drop-shadow(0 0 30px rgba(0, 240, 255, 0.3));
}
.hero h1 .cn { display: block; font-family: var(--font-cn); font-weight: 800; }
.hero-sub {
  font-family: var(--font-cn);
  font-size: clamp(18px, 2.5vw, 24px);
  color: var(--text-dim);
  margin: 20px 0 12px;
  font-weight: 400;
}
.hero-desc {
  font-family: var(--font-cn);
  font-size: 15px; color: var(--text-mute);
  max-width: 560px; margin-bottom: 40px;
}
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }

.btn {
  font-family: var(--font-mono); font-size: 13px; letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 15px 32px; border-radius: 4px;
  display: inline-flex; align-items: center; gap: 10px;
  transition: all 0.3s ease;
  position: relative; overflow: hidden;
}
.btn-primary {
  background: linear-gradient(120deg, var(--cyan), var(--violet));
  color: var(--bg-0); font-weight: 700;
  box-shadow: 0 0 30px rgba(0, 240, 255, 0.35);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 40px rgba(0, 240, 255, 0.55); }
.btn-ghost { border: 1px solid var(--panel-border); color: var(--text); background: rgba(255,255,255,0.02); }
.btn-ghost:hover { border-color: var(--cyan); color: var(--cyan); box-shadow: var(--glow-cyan); }

/* Hero 数据条 */
.hero-stats {
  position: relative; z-index: 2;
  display: flex; gap: 48px; margin-top: 72px;
  padding-top: 32px; border-top: 1px solid var(--panel-border);
  flex-wrap: wrap;
}
.hero-stat .num {
  font-family: var(--font-display); font-weight: 800;
  font-size: 36px; color: var(--cyan);
  text-shadow: 0 0 20px rgba(0, 240, 255, 0.4);
}
.hero-stat .num .u { color: var(--violet); font-size: 20px; }
.hero-stat .label { font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.15em; color: var(--text-mute); text-transform: uppercase; margin-top: 4px; }

/* 滚动指示 */
.scroll-hint {
  position: absolute; bottom: 32px; left: 50%; transform: translateX(-50%);
  z-index: 2; text-align: center;
}
.scroll-hint .mouse {
  width: 24px; height: 40px; border: 1.5px solid var(--text-mute); border-radius: 12px;
  margin: 0 auto; position: relative;
}
.scroll-hint .mouse::after {
  content: ''; position: absolute; top: 8px; left: 50%; transform: translateX(-50%);
  width: 4px; height: 8px; background: var(--cyan); border-radius: 2px;
  animation: scrollWheel 1.8s infinite;
}
@keyframes scrollWheel { 0% { opacity: 0; transform: translate(-50%, 0); } 40% { opacity: 1; } 80% { opacity: 0; transform: translate(-50%, 14px); } 100% { opacity: 0; } }
.scroll-hint span { display: block; font-family: var(--font-mono); font-size: 10px; letter-spacing: 0.2em; color: var(--text-mute); margin-top: 10px; }

/* ---------- About ---------- */
.about-grid { display: grid; grid-template-columns: 1fr 1.3fr; gap: 64px; align-items: center; }
.about-stats { display: grid; grid-template-columns: 1fr; gap: 28px; }
.stat-card {
  padding: 28px; border: 1px solid var(--panel-border);
  background: var(--panel); backdrop-filter: blur(10px);
  border-radius: 8px; position: relative; overflow: hidden;
  transition: all 0.3s;
}
.stat-card::before {
  content: ''; position: absolute; top: 0; left: 0; width: 3px; height: 100%;
  background: linear-gradient(var(--cyan), var(--violet));
}
.stat-card:hover { transform: translateX(6px); border-color: var(--cyan); }
.stat-card .num { font-family: var(--font-display); font-weight: 800; font-size: 44px; line-height: 1; }
.stat-card .num .grad { background: linear-gradient(120deg, var(--cyan), var(--violet)); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
.stat-card .num .u { font-size: 22px; color: var(--cyan); }
.stat-card .label { font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.12em; color: var(--text-dim); text-transform: uppercase; margin-top: 10px; }

.about-text { font-family: var(--font-cn); }
.about-text .quote {
  font-size: 20px; line-height: 1.6; color: var(--text);
  margin-bottom: 24px; font-weight: 500;
}
.about-text p { color: var(--text-dim); font-size: 15px; line-height: 1.9; margin-bottom: 18px; }
.about-text .corner { display: inline-block; font-family: var(--font-mono); font-size: 12px; color: var(--cyan); letter-spacing: 0.15em; margin-top: 8px; }

/* ---------- Products ---------- */
.products-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.product-card {
  position: relative; padding: 36px 32px;
  border: 1px solid var(--panel-border);
  background: var(--panel); backdrop-filter: blur(10px);
  border-radius: 12px; overflow: hidden;
  transition: all 0.4s cubic-bezier(0.2, 0.8, 0.2, 1);
  cursor: pointer;
}
.product-card::before {
  content: ''; position: absolute; inset: 0; border-radius: 12px; padding: 1px;
  background: linear-gradient(135deg, var(--cyan), transparent 40%, transparent 60%, var(--violet));
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor; mask-composite: exclude;
  opacity: 0; transition: opacity 0.4s;
}
.product-card:hover { transform: translateY(-8px); box-shadow: 0 20px 60px rgba(0, 240, 255, 0.15); }
.product-card:hover::before { opacity: 1; }
.product-card .pcorner { position: absolute; width: 14px; height: 14px; border: 1.5px solid var(--cyan); opacity: 0.5; }
.product-card .pcorner.tl { top: 10px; left: 10px; border-right: none; border-bottom: none; }
.product-card .pcorner.tr { top: 10px; right: 10px; border-left: none; border-bottom: none; }
.product-card .pcorner.bl { bottom: 10px; left: 10px; border-right: none; border-top: none; }
.product-card .pcorner.br { bottom: 10px; right: 10px; border-left: none; border-top: none; }
.product-icon {
  width: 64px; height: 64px; border-radius: 12px;
  display: grid; place-items: center;
  background: linear-gradient(135deg, rgba(0,240,255,0.12), rgba(176,38,255,0.12));
  border: 1px solid var(--panel-border);
  margin-bottom: 28px; transition: all 0.4s;
}
.product-icon svg { width: 30px; height: 30px; stroke: var(--cyan); }
.product-card:hover .product-icon { border-color: var(--cyan); box-shadow: var(--glow-cyan); transform: scale(1.05); }
.product-card:hover .product-icon svg { stroke: var(--cyan); }
.product-name {
  font-family: var(--font-cn); font-weight: 700;
  font-size: 22px; margin-bottom: 6px;
}
.product-en {
  font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.15em;
  color: var(--text-mute); text-transform: uppercase; margin-bottom: 18px;
}
.product-desc {
  font-family: var(--font-cn); font-size: 14px; color: var(--text-dim);
  line-height: 1.8; margin-bottom: 24px; min-height: 84px;
}
.product-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 24px; }
.tag {
  font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.05em;
  padding: 5px 12px; border-radius: 30px;
  border: 1px solid var(--panel-border); color: var(--text-dim);
  background: rgba(0, 240, 255, 0.03);
}
.product-link {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.12em;
  color: var(--cyan); text-transform: uppercase;
  transition: gap 0.3s;
}
.product-card:hover .product-link { gap: 14px; }
.product-link .arrow { transition: transform 0.3s; }
.product-card:hover .product-link .arrow { transform: translateX(4px); }

/* ---------- Modal ---------- */
.modal-overlay {
  position: fixed; inset: 0; z-index: 200;
  background: rgba(5, 8, 22, 0.8); backdrop-filter: blur(8px);
  display: none; align-items: center; justify-content: center; padding: 24px;
  opacity: 0; transition: opacity 0.3s;
}
.modal-overlay.open { display: flex; opacity: 1; }
.modal {
  width: 100%; max-width: 640px;
  background: var(--bg-1); border: 1px solid var(--panel-border);
  border-radius: 16px; padding: 48px; position: relative;
  transform: scale(0.95); transition: transform 0.3s;
  max-height: 85vh; overflow-y: auto;
}
.modal-overlay.open .modal { transform: scale(1); }
.modal-close {
  position: absolute; top: 20px; right: 20px;
  width: 36px; height: 36px; border-radius: 50%;
  border: 1px solid var(--panel-border);
  display: grid; place-items: center;
  color: var(--text-dim); transition: all 0.2s;
}
.modal-close:hover { border-color: var(--pink); color: var(--pink); transform: rotate(90deg); }
.modal-icon { width: 56px; height: 56px; border-radius: 12px; display: grid; place-items: center; background: linear-gradient(135deg, rgba(0,240,255,0.12), rgba(176,38,255,0.12)); border: 1px solid var(--panel-border); margin-bottom: 24px; }
.modal-icon svg { width: 28px; height: 28px; stroke: var(--cyan); }
.modal-name { font-family: var(--font-cn); font-weight: 700; font-size: 28px; margin-bottom: 8px; }
.modal-en { font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.15em; color: var(--text-mute); text-transform: uppercase; margin-bottom: 24px; }
.modal-desc { font-family: var(--font-cn); color: var(--text-dim); font-size: 15px; line-height: 1.9; }
.modal-features { margin-top: 24px; padding-top: 24px; border-top: 1px solid var(--panel-border); }
.modal-features h4 { font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.15em; color: var(--cyan); text-transform: uppercase; margin-bottom: 16px; }
.modal-features li { display: flex; align-items: flex-start; gap: 12px; padding: 8px 0; color: var(--text-dim); font-family: var(--font-cn); font-size: 14px; }
.modal-features li::before { content: '▸'; color: var(--cyan); flex-shrink: 0; }

/* ---------- Contact ---------- */
.contact { background: linear-gradient(180deg, transparent, rgba(10, 14, 39, 0.6)); }
.contact-grid { display: grid; grid-template-columns: 1.4fr 1fr; gap: 48px; align-items: start; }
.terminal {
  border: 1px solid var(--panel-border); border-radius: 12px; overflow: hidden;
  background: rgba(5, 8, 22, 0.6); backdrop-filter: blur(10px);
}
.terminal-bar {
  display: flex; align-items: center; gap: 8px;
  padding: 14px 18px; background: rgba(15, 20, 56, 0.6);
  border-bottom: 1px solid var(--panel-border);
}
.terminal-bar .dot-r { width: 12px; height: 12px; border-radius: 50%; background: #ff5f56; }
.terminal-bar .dot-y { width: 12px; height: 12px; border-radius: 50%; background: #ffbd2e; }
.terminal-bar .dot-g { width: 12px; height: 12px; border-radius: 50%; background: #27c93f; }
.terminal-bar .title { margin-left: 12px; font-family: var(--font-mono); font-size: 12px; color: var(--text-mute); }
.terminal-body { padding: 28px; font-family: var(--font-mono); font-size: 14px; }
.term-line { display: flex; gap: 12px; padding: 6px 0; }
.term-line .prompt { color: var(--green); flex-shrink: 0; }
.term-line .cmd { color: var(--text); }
.term-line .key { color: var(--violet); }
.term-line .val { color: var(--cyan); }
.term-line .val a:hover { text-decoration: underline; }
.terminal-body .cursor { display: inline-block; width: 9px; height: 16px; background: var(--cyan); animation: blink 1s steps(2) infinite; vertical-align: middle; margin-left: 4px; }
@keyframes blink { 50% { opacity: 0; } }

.contact-side { padding: 8px 0; }
.contact-side h3 { font-family: var(--font-cn); font-size: 22px; margin-bottom: 8px; }
.contact-side .sub { font-family: var(--font-mono); font-size: 12px; color: var(--text-mute); letter-spacing: 0.1em; margin-bottom: 28px; text-transform: uppercase; }
.qr-card {
  border: 1px solid var(--panel-border); border-radius: 12px; padding: 24px; text-align: center;
  background: var(--panel); backdrop-filter: blur(10px);
}
.qr-card .qr {
  width: 140px; height: 140px; margin: 0 auto 16px; border-radius: 8px;
  background: #fff; padding: 8px;
}
.qr-card .qr svg { width: 100%; height: 100%; }
.qr-card .qr-label { font-family: var(--font-mono); font-size: 11px; color: var(--text-dim); letter-spacing: 0.1em; text-transform: uppercase; }
.qr-card .qr-text { font-family: var(--font-cn); font-size: 13px; color: var(--text); margin-top: 6px; }
.contact-cta { margin-top: 28px; display: flex; gap: 12px; flex-wrap: wrap; }
.contact-cta a {
  flex: 1; min-width: 140px; text-align: center;
  padding: 14px; border: 1px solid var(--panel-border); border-radius: 8px;
  font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--text-dim); transition: all 0.25s;
}
.contact-cta a:hover { border-color: var(--cyan); color: var(--cyan); box-shadow: var(--glow-cyan); }
.contact-cta a svg { width: 16px; height: 16px; vertical-align: middle; margin-right: 6px; }

/* ---------- Footer ---------- */
.footer {
  border-top: 1px solid var(--panel-border);
  padding: 40px 0; background: rgba(5, 8, 22, 0.6);
}
.footer-inner { display: flex; justify-content: space-between; align-items: center; gap: 24px; flex-wrap: wrap; }
.footer-copy { font-family: var(--font-mono); font-size: 12px; color: var(--text-mute); letter-spacing: 0.05em; }
.footer-icp a { color: var(--text-dim); transition: color 0.2s; }
.footer-icp a:hover { color: var(--cyan); }
.footer-links { display: flex; gap: 24px; }
.footer-links a { font-family: var(--font-mono); font-size: 12px; color: var(--text-mute); letter-spacing: 0.1em; text-transform: uppercase; transition: color 0.2s; }
.footer-links a:hover { color: var(--cyan); }

/* ---------- 动画入场 ---------- */
.reveal { opacity: 0; transform: translateY(30px); transition: opacity 0.8s ease, transform 0.8s ease; }
.reveal.in-view { opacity: 1; transform: translateY(0); }
.reveal.left { transform: translateX(-40px); }
.reveal.right { transform: translateX(40px); }
.reveal.left.in-view, .reveal.right.in-view { transform: translateX(0); }
.reveal.zoom { transform: scale(0.9); }
.reveal.zoom.in-view { transform: scale(1); }
.d-1 { transition-delay: 0.1s; } .d-2 { transition-delay: 0.2s; } .d-3 { transition-delay: 0.3s; }
.d-4 { transition-delay: 0.4s; } .d-5 { transition-delay: 0.5s; } .d-6 { transition-delay: 0.6s; }

/* ---------- 响应式 ---------- */
@media (max-width: 980px) {
  .about-grid { grid-template-columns: 1fr; gap: 40px; }
  .products-grid { grid-template-columns: repeat(2, 1fr); }
  .contact-grid { grid-template-columns: 1fr; }
  .hero-stats { gap: 32px; }
}
@media (max-width: 760px) {
  .section { padding: 80px 0; }
  .nav-links {
    position: fixed; top: 64px; left: 0; right: 0;
    flex-direction: column; gap: 0;
    background: rgba(5, 8, 22, 0.97); backdrop-filter: blur(16px);
    padding: 20px 24px; border-bottom: 1px solid var(--panel-border);
    transform: translateY(-120%); transition: transform 0.4s ease;
    align-items: flex-start;
  }
  .nav-links.open { transform: translateY(0); }
  .nav-links a { width: 100%; padding: 12px 0; border-bottom: 1px solid rgba(255,255,255,0.04); }
  .nav-cta { display: none; }
  .nav-toggle { display: flex; }
  .products-grid { grid-template-columns: 1fr; }
  .modal { padding: 32px 24px; }
  .hero { padding: 100px 0 60px; }
  .hero-stats { gap: 24px; }
  .hero-stat .num { font-size: 28px; }
}
@media (max-width: 480px) {
  .container { padding: 0 18px; }
  .hero-actions { flex-direction: column; }
  .btn { width: 100%; justify-content: center; }
}