/* ═══════════════════════════════════════════
   全局变量 & 重置
═══════════════════════════════════════════ */
:root {
    --bg: #060b14;
    --bg2: #080d1a;
    --bg-card: #0c1422;
    --bg-card2: #0f1929;
    --cyan: #00d4ff;
    --cyan-dim: rgba(0, 212, 255, 0.15);
    --cyan-mid: rgba(0, 212, 255, 0.35);
    --blue: #0088ff;
    --purple: #7c3aed;
    --text: #e2eaf4;
    --muted: #6b82a0;
    --border: rgba(255, 255, 255, 0.06);
    --border2: rgba(0, 212, 255, 0.2);
    --glow: 0 0 30px rgba(0, 212, 255, 0.2);
    --glow-strong: 0 0 50px rgba(0, 212, 255, 0.35);
    --radius: 16px;
    --radius-sm: 10px;
    --transition: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
    font-family: 'Microsoft YaHei', 'PingFang SC', Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.7;
    overflow-x: hidden;
}

a { text-decoration: none; color: inherit; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }

/* ═══════════════════════════════════════════
   通用
═══════════════════════════════════════════ */
.container { max-width: 1160px; margin: 0 auto; padding: 0 28px; }

/* 入场动画 */
.reveal {
    opacity: 0;
    transform: translateY(28px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.in-view {
    opacity: 1;
    transform: translateY(0);
}

/* Section label */
.section-label {
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 4px;
    text-transform: uppercase;
    color: var(--cyan);
    margin-bottom: 10px;
}
.section-title {
    font-size: 2.6rem;
    font-weight: 900;
    color: #fff;
    line-height: 1.2;
    margin-bottom: 12px;
    background: linear-gradient(135deg, #fff 0%, var(--cyan) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.section-sub {
    color: var(--muted);
    font-size: 1.05rem;
    margin-bottom: 56px;
}

/* ═══════════════════════════════════════════
   导航栏
═══════════════════════════════════════════ */
.navbar {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 1000;
    background: rgba(6, 11, 20, 0.7);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid transparent;
    transition: border-color var(--transition), background var(--transition), box-shadow var(--transition);
}
.navbar.scrolled {
    background: rgba(6, 11, 20, 0.92);
    border-bottom-color: var(--border2);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.4);
}
.nav-inner {
    display: flex;
    align-items: center;
    height: 66px;
    gap: 0;
}
.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 1.3rem;
    font-weight: 900;
    color: #fff;
    margin-right: auto;
}
.logo-icon { font-size: 1.5rem; }

.nav-links {
    display: flex;
    list-style: none;
    gap: 4px;
    margin: 0 20px;
}
.nav-link {
    display: block;
    padding: 8px 16px;
    color: var(--muted);
    font-size: 0.9rem;
    font-weight: 500;
    border-radius: 8px;
    transition: color var(--transition), background var(--transition);
    position: relative;
}
.nav-link:hover { color: #fff; background: rgba(255,255,255,0.04); }
.nav-link.active { color: var(--cyan); background: var(--cyan-dim); }

.nav-cta {
    background: linear-gradient(135deg, var(--cyan), var(--blue));
    color: #fff;
    padding: 9px 22px;
    border-radius: 50px;
    font-size: 0.88rem;
    font-weight: 700;
    transition: all var(--transition);
    box-shadow: 0 0 20px rgba(0, 212, 255, 0.25);
    white-space: nowrap;
}
.nav-cta:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 32px rgba(0, 212, 255, 0.4);
}

/* 汉堡 */
.menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 26px; height: 20px;
    padding: 0;
    margin-left: 16px;
}
.menu-toggle span {
    display: block;
    width: 100%; height: 2px;
    background: #fff;
    border-radius: 2px;
    transition: all 0.3s;
}
.menu-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 6px); }
.menu-toggle.active span:nth-child(2) { opacity: 0; }
.menu-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -6px); }

/* ═══════════════════════════════════════════
   Hero 区块
═══════════════════════════════════════════ */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    background: var(--bg);
}

/* 粒子画布 */
#particles {
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 100%;
    z-index: 0;
}

/* 动态网格背景 */
.hero-mesh {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    z-index: 0;
    background-image:
        linear-gradient(rgba(0, 212, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 212, 255, 0.03) 1px, transparent 1px);
    background-size: 60px 60px;
}

/* 氛围光 */
.hero-glow {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    z-index: 0;
    animation: glowPulse 6s ease-in-out infinite alternate;
}
.hero-glow-1 {
    width: 600px; height: 600px;
    background: radial-gradient(circle, rgba(0, 136, 255, 0.12), transparent 70%);
    top: -100px; left: -200px;
    animation-delay: 0s;
}
.hero-glow-2 {
    width: 500px; height: 500px;
    background: radial-gradient(circle, rgba(0, 212, 255, 0.08), transparent 70%);
    bottom: -100px; right: -150px;
    animation-delay: 3s;
}
@keyframes glowPulse {
    0% { opacity: 0.6; transform: scale(1); }
    100% { opacity: 1; transform: scale(1.1); }
}

/* Hero 内容 */
.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    max-width: 760px;
    padding: 0 28px;
}
.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(0, 212, 255, 0.08);
    border: 1px solid rgba(0, 212, 255, 0.2);
    color: var(--cyan);
    padding: 7px 18px;
    border-radius: 50px;
    font-size: 0.82rem;
    font-weight: 600;
    letter-spacing: 0.5px;
    margin-bottom: 28px;
}
.badge-dot {
    width: 6px; height: 6px;
    background: var(--cyan);
    border-radius: 50%;
    animation: blink 1.5s ease-in-out infinite;
}
@keyframes blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.3; }
}
.hero-title {
    font-size: 4rem;
    font-weight: 900;
    line-height: 1.18;
    color: #fff;
    margin-bottom: 20px;
    letter-spacing: -1.5px;
}
.gradient-text {
    background: linear-gradient(90deg, var(--cyan), #a855f7);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.hero-sub {
    font-size: 1.15rem;
    color: var(--muted);
    margin-bottom: 44px;
}

/* Hero 按钮 */
.hero-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 72px;
}
.btn-neon {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: linear-gradient(135deg, var(--cyan), var(--blue));
    color: #fff;
    padding: 14px 32px;
    border-radius: 50px;
    font-weight: 700;
    font-size: 1.02rem;
    transition: all var(--transition);
    box-shadow: 0 0 24px rgba(0, 212, 255, 0.3);
}
.btn-neon:hover {
    transform: translateY(-3px);
    box-shadow: 0 0 42px rgba(0, 212, 255, 0.5);
}
.btn-ghost {
    display: inline-flex;
    align-items: center;
    border: 2px solid rgba(255, 255, 255, 0.12);
    color: rgba(255, 255, 255, 0.7);
    padding: 12px 32px;
    border-radius: 50px;
    font-weight: 600;
    font-size: 1.02rem;
    transition: all var(--transition);
}
.btn-ghost:hover {
    border-color: rgba(255, 255, 255, 0.3);
    color: #fff;
    background: rgba(255, 255, 255, 0.04);
}

/* Hero 统计 */
.hero-stats {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0;
    background: rgba(12, 20, 34, 0.8);
    border: 1px solid var(--border2);
    border-radius: 20px;
    padding: 24px 40px;
    backdrop-filter: blur(12px);
    width: fit-content;
    margin: 0 auto;
}
.stat-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
    padding: 0 36px;
}
.stat-divider {
    width: 1px;
    height: 48px;
    background: var(--border2);
}
.stat-num {
    font-size: 2.6rem;
    font-weight: 900;
    color: var(--cyan);
    line-height: 1;
}
.stat-unit {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--cyan);
    opacity: 0.7;
    margin-top: 2px;
}
.stat-label {
    font-size: 0.8rem;
    color: var(--muted);
    margin-top: 2px;
}

/* 滚动提示 */
.scroll-cue {
    position: absolute;
    bottom: 32px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 2;
    width: 26px; height: 42px;
    border: 2px solid rgba(255,255,255,0.15);
    border-radius: 13px;
    display: flex;
    align-items: flex-start;
    justify-content: center;
    padding-top: 6px;
    transition: border-color 0.3s;
}
.scroll-cue:hover { border-color: var(--cyan); }
.scroll-cue-inner {
    width: 3px; height: 8px;
    background: rgba(255,255,255,0.4);
    border-radius: 2px;
    animation: scrollBounce 1.6s ease-in-out infinite;
}
@keyframes scrollBounce {
    0%, 100% { transform: translateY(0); opacity: 1; }
    60% { transform: translateY(10px); opacity: 0.2; }
}

/* ═══════════════════════════════════════════
   核心优势
═══════════════════════════════════════════ */
.advantages {
    padding: 110px 0;
    background: var(--bg);
    position: relative;
}
.advantages::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(0,212,255,0.2), transparent);
}

.adv-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

/* 卡片通用边框动画 */
.adv-card {
    position: relative;
    border-radius: var(--radius);
    overflow: hidden;
    cursor: default;
    transition: transform var(--transition);
}
.adv-card:hover { transform: translateY(-6px); }

/* 伪元素渐变边框 */
.adv-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    border-radius: var(--radius);
    padding: 1px;
    background: linear-gradient(135deg, transparent 40%, var(--cyan) 60%, var(--purple) 100%);
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    opacity: 0;
    transition: opacity var(--transition);
}
.adv-card:hover::before { opacity: 1; }

.adv-card-inner {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 32px 24px;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    transition: border-color var(--transition), background var(--transition);
}
.adv-card:hover .adv-card-inner {
    border-color: rgba(0, 212, 255, 0.15);
    background: var(--bg-card2);
}

.adv-icon-box {
    width: 54px; height: 54px;
    background: var(--cyan-dim);
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--cyan);
    margin-bottom: 20px;
    transition: all var(--transition);
}
.adv-card:hover .adv-icon-box {
    background: rgba(0, 212, 255, 0.22);
    box-shadow: 0 0 20px rgba(0, 212, 255, 0.2);
}
.adv-card h3 {
    font-size: 1.15rem;
    font-weight: 800;
    color: #fff;
    margin-bottom: 10px;
}
.adv-card p {
    font-size: 0.88rem;
    color: var(--muted);
    line-height: 1.7;
    flex: 1;
}
.adv-tag {
    margin-top: 16px;
    font-size: 0.72rem;
    font-weight: 700;
    color: var(--cyan);
    background: var(--cyan-dim);
    padding: 3px 10px;
    border-radius: 4px;
    letter-spacing: 0.5px;
}

/* ═══════════════════════════════════════════
   产品区块
═══════════════════════════════════════════ */
.products {
    padding: 110px 0;
    background: var(--bg2);
    position: relative;
}
.products::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(0,212,255,0.2), transparent);
}

/* 标签筛选 */
.prod-tabs {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-bottom: 36px;
}
.prod-tab {
    padding: 9px 22px;
    border-radius: 50px;
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--muted);
    background: rgba(255,255,255,0.04);
    border: 1px solid var(--border);
    transition: all var(--transition);
    cursor: pointer;
}
.prod-tab:hover {
    color: var(--text);
    background: rgba(255,255,255,0.07);
}
.prod-tab.active {
    color: var(--cyan);
    background: var(--cyan-dim);
    border-color: rgba(0, 212, 255, 0.3);
    box-shadow: 0 0 14px rgba(0, 212, 255, 0.12);
}

/* 产品网格 */
.prod-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}
.prod-grid .prod-card:nth-child(1) { grid-column: 1; }
.prod-grid .prod-card:nth-child(2) { grid-column: 2; }
.prod-grid .prod-card:nth-child(3) { grid-column: 1; }
.prod-grid .prod-card:nth-child(4) { grid-column: 2; }

.prod-card {
    position: relative;
    border-radius: var(--radius);
    overflow: hidden;
    transition: transform var(--transition), opacity 0.4s ease;
}
.prod-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    border-radius: var(--radius);
    padding: 1px;
    background: linear-gradient(135deg, transparent 40%, var(--cyan) 60%, var(--blue) 100%);
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    opacity: 0;
    transition: opacity var(--transition);
    z-index: 2;
    pointer-events: none;
}
.prod-card:hover::before { opacity: 1; }
.prod-card:hover { transform: translateY(-4px); }
.prod-card.hidden { display: none; }

.prod-card-inner {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    display: flex;
    gap: 0;
    transition: border-color var(--transition);
}
.prod-card:hover .prod-card-inner { border-color: rgba(0, 212, 255, 0.15); }

.prod-visual {
    width: 140px;
    min-height: 160px;
    background: linear-gradient(135deg, rgba(0, 136, 255, 0.08), rgba(0, 212, 255, 0.05));
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    position: relative;
    overflow: hidden;
}
.prod-icon-large {
    font-size: 3.5rem;
    z-index: 1;
    position: relative;
}
.prod-shine {
    position: absolute;
    top: -50%; left: -50%;
    width: 200%; height: 200%;
    background: radial-gradient(circle, rgba(0, 212, 255, 0.06) 0%, transparent 60%);
    transition: opacity 0.4s;
}
.prod-card:hover .prod-shine { opacity: 1.5; }

.prod-info {
    padding: 22px 24px;
    display: flex;
    flex-direction: column;
    gap: 6px;
    flex: 1;
}
.prod-badge {
    display: inline-block;
    font-size: 0.68rem;
    font-weight: 700;
    letter-spacing: 1px;
    padding: 2px 8px;
    border-radius: 4px;
    width: fit-content;
    background: rgba(0, 212, 255, 0.12);
    color: var(--cyan);
    border: 1px solid rgba(0, 212, 255, 0.2);
}
.prod-badge.used { background: rgba(124, 58, 237, 0.12); color: #a78bfa; border-color: rgba(124, 58, 237, 0.2); }
.prod-badge.hot { background: rgba(245, 158, 11, 0.12); color: #fbbf24; border-color: rgba(245, 158, 11, 0.2); }

.prod-info h3 {
    font-size: 1.05rem;
    font-weight: 800;
    color: #fff;
}
.prod-info p {
    font-size: 0.83rem;
    color: var(--muted);
    line-height: 1.6;
}
.prod-price {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--cyan);
    margin-top: 4px;
}
.prod-btn {
    display: inline-block;
    color: var(--cyan);
    font-size: 0.85rem;
    font-weight: 600;
    margin-top: auto;
    transition: all 0.2s;
    padding: 4px 0;
    border-bottom: 1px solid transparent;
}
.prod-btn:hover {
    border-bottom-color: var(--cyan);
}

/* ═══════════════════════════════════════════
   服务区块
═══════════════════════════════════════════ */
.services {
    padding: 110px 0;
    background: var(--bg);
    position: relative;
}
.services::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(0,212,255,0.2), transparent);
}

.svc-list {
    max-width: 860px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.svc-item {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    transition: border-color var(--transition);
}
.svc-item:hover, .svc-item.open { border-color: rgba(0, 212, 255, 0.2); }

.svc-toggle {
    width: 100%;
    display: flex;
    align-items: center;
    gap: 20px;
    padding: 22px 28px;
    text-align: left;
    color: var(--text);
    transition: background var(--transition);
}
.svc-toggle:hover { background: rgba(255,255,255,0.02); }

.svc-n {
    font-size: 1.6rem;
    font-weight: 900;
    color: rgba(0, 212, 255, 0.18);
    flex-shrink: 0;
    width: 44px;
    line-height: 1;
}
.svc-text { flex: 1; }
.svc-text h3 { font-size: 1.05rem; font-weight: 700; color: #fff; margin-bottom: 3px; }
.svc-short { font-size: 0.85rem; color: var(--muted); }

.svc-icon {
    width: 32px; height: 32px;
    border: 1px solid var(--border2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--cyan);
    flex-shrink: 0;
    transition: all 0.3s;
}
.svc-item.open .svc-icon {
    background: var(--cyan-dim);
    transform: rotate(45deg);
}

/* 展开内容 */
.svc-body {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}
.svc-item.open .svc-body { max-height: 300px; }
.svc-body-inner {
    padding: 0 28px 22px 92px;
}
.svc-body-inner p {
    font-size: 0.9rem;
    color: var(--muted);
    line-height: 1.75;
    margin-bottom: 14px;
}
.svc-tags {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}
.svc-tags span {
    font-size: 0.75rem;
    padding: 3px 10px;
    border-radius: 4px;
    background: rgba(0, 212, 255, 0.07);
    color: var(--cyan);
    border: 1px solid rgba(0, 212, 255, 0.12);
}

/* ═══════════════════════════════════════════
   联系区块
═══════════════════════════════════════════ */
.contact {
    padding: 110px 0;
    background: var(--bg2);
    position: relative;
    overflow: hidden;
}
.contact::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(0,212,255,0.2), transparent);
}

/* 联系区块 — 单列居中布局 */
.contact-layout {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 24px;
    max-width: 860px;
    margin: 0 auto;
    width: 100%;
    position: relative;
    z-index: 2;
}

/* 联系区域互动背景 */
#contact-particles {
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 100%;
    z-index: 0;
    pointer-events: none;
    opacity: 0.6;
}
.contact-glow {
    position: absolute;
    width: 500px; height: 500px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(0,212,255,0.07) 0%, transparent 70%);
    pointer-events: none;
    transform: translate(-50%, -50%);
    transition: left 0.6s ease, top 0.6s ease;
    z-index: 0;
}

/* 联系信息 */
.info-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 28px 32px;
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0;
    width: 100%;
    position: relative;
    overflow: hidden;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.info-card::after {
    content: '';
    position: absolute;
    top: -50%; left: -50%;
    width: 200%; height: 200%;
    background: radial-gradient(circle, rgba(0,212,255,0.04) 0%, transparent 60%);
    opacity: 0;
    transition: opacity 0.4s;
    pointer-events: none;
}
.info-card:hover::after { opacity: 1; }
.info-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 40px rgba(0,212,255,0.08);
}
.info-row {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 8px;
    padding: 16px 28px;
    border-bottom: none;
    border-right: 1px solid var(--border);
    flex: 1;
    min-width: 160px;
    border-radius: 8px;
    transition: background 0.3s ease, transform 0.3s ease;
    cursor: default;
}
.info-row:last-child { border-right: none; }
.info-row:hover {
    background: rgba(0, 212, 255, 0.05);
    transform: translateY(-2px);
}
.info-icon { font-size: 1.8rem; flex-shrink: 0; transition: transform 0.3s ease; }
.info-row:hover .info-icon { transform: scale(1.15); }
.info-label { font-size: 0.68rem; font-weight: 700; letter-spacing: 1px; text-transform: uppercase; color: var(--cyan); }
.info-val { font-size: 0.9rem; color: var(--text); line-height: 1.5; }

/* 微信卡片 */
.wechat-card {
    background: var(--bg-card);
    border: 1px solid rgba(0, 212, 255, 0.2);
    border-radius: var(--radius);
    padding: 36px 40px;
    position: relative;
    overflow: hidden;
    width: 100%;
    text-align: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.wechat-card::before {
    content: '';
    position: absolute;
    top: 0; left: -100%;
    width: 100%; height: 2px;
    background: linear-gradient(90deg, transparent, var(--cyan), var(--purple), var(--cyan), transparent);
    animation: shimmer 3s linear infinite;
}
.wechat-card::after {
    content: '';
    position: absolute;
    top: -50%; left: -50%;
    width: 200%; height: 200%;
    background: radial-gradient(circle, rgba(0,212,255,0.06) 0%, transparent 60%);
    opacity: 0;
    transition: opacity 0.4s;
    pointer-events: none;
}
.wechat-card:hover::after { opacity: 1; }
.wechat-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 16px 50px rgba(0,212,255,0.12);
    border-color: rgba(0, 212, 255, 0.35);
}
@keyframes shimmer {
    0% { left: -100%; }
    100% { left: 100%; }
}
.wechat-label {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 0.78rem;
    font-weight: 700;
    color: var(--cyan);
    letter-spacing: 1px;
    text-transform: uppercase;
    margin-bottom: 24px;
}
.wechat-dot {
    width: 6px; height: 6px;
    background: var(--cyan);
    border-radius: 50%;
    animation: blink 1.5s ease-in-out infinite;
}
.wechat-body {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
}
.wechat-avatar {
    font-size: 3.5rem;
    background: rgba(0, 212, 255, 0.08);
    width: 80px; height: 80px;
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.3s ease;
}
.wechat-card:hover .wechat-avatar { transform: scale(1.1); }
.wechat-detail {
    display: flex;
    flex-direction: column;
    align-items: center;
}
.wechat-num {
    font-size: 2.2rem;
    font-weight: 900;
    color: var(--cyan);
    letter-spacing: 3px;
    text-shadow: 0 0 30px rgba(0, 212, 255, 0.4);
    transition: text-shadow 0.3s ease;
}
.wechat-card:hover .wechat-num {
    text-shadow: 0 0 40px rgba(0, 212, 255, 0.7);
}
.wechat-sub { font-size: 0.82rem; color: var(--muted); margin-bottom: 16px; }
.wechat-steps { margin-bottom: 18px; }
.w-step {
    display: flex; align-items: center; gap: 8px;
    font-size: 0.82rem; color: var(--muted);
    margin-bottom: 5px;
}
.w-n {
    width: 18px; height: 18px;
    background: var(--cyan-dim);
    color: var(--cyan);
    border-radius: 50%;
    font-size: 0.68rem; font-weight: 700;
    display: flex; align-items: center; justify-content: center;
    flex-shrink: 0;
}
.btn-copy-wechat {
    display: inline-block;
    background: linear-gradient(135deg, var(--cyan), var(--blue));
    color: #fff;
    padding: 12px 36px;
    border-radius: 50px;
    font-size: 0.92rem; font-weight: 700;
    cursor: pointer;
    transition: all var(--transition);
    text-align: center;
}
.btn-copy-wechat:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 24px rgba(0, 212, 255, 0.4);
}
.btn-copy-wechat:active { transform: scale(0.97); }

/* 表单 */
.contact-form-wrap {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 32px;
}
.form-header {
    margin-bottom: 24px;
}
.form-header h3 {
    font-size: 1.3rem;
    font-weight: 800;
    color: #fff;
    margin-bottom: 6px;
}
.form-header p { font-size: 0.85rem; color: var(--muted); }
.contact-form { display: flex; flex-direction: column; gap: 14px; }

.form-group {
    position: relative;
}
.form-hint {
    position: absolute;
    right: 12px; top: 50%;
    transform: translateY(-50%);
    font-size: 0.68rem;
    color: rgba(0, 212, 255, 0.4);
    pointer-events: none;
}

.contact-form input,
.contact-form select,
.contact-form textarea {
    width: 100%;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 13px 16px;
    color: var(--text);
    font-size: 0.95rem;
    font-family: inherit;
    transition: border-color var(--transition), box-shadow var(--transition);
    resize: none;
    appearance: none;
    -webkit-appearance: none;
}
.contact-form input:focus,
.contact-form select:focus,
.contact-form textarea:focus {
    outline: none;
    border-color: var(--cyan);
    box-shadow: 0 0 0 3px rgba(0, 212, 255, 0.1);
}
.contact-form input::placeholder,
.contact-form textarea::placeholder { color: var(--muted); }
.contact-form select option { background: var(--bg-card); }

.btn-submit {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    background: linear-gradient(135deg, var(--cyan), var(--blue));
    color: #fff;
    padding: 15px;
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    transition: all var(--transition);
    font-family: inherit;
    margin-top: 4px;
    border: none;
}
.btn-submit:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 28px rgba(0, 212, 255, 0.35);
}
.btn-submit.success {
    background: #10b981;
    box-shadow: none;
}
.btn-submit-arrow { transition: transform 0.2s; }
.btn-submit:hover .btn-submit-arrow { transform: translateX(3px); }

/* ═══════════════════════════════════════════
   页脚
═══════════════════════════════════════════ */
.footer {
    background: #040810;
    border-top: 1px solid var(--border);
    padding: 48px 0 32px;
    text-align: center;
}
.footer-logo { font-size: 1.5rem; font-weight: 900; color: #fff; margin-bottom: 6px; }
.footer-tagline { font-size: 0.82rem; color: var(--muted); margin-bottom: 18px; }
.footer-tags {
    display: flex; justify-content: center; gap: 10px;
    flex-wrap: wrap; margin-bottom: 24px;
}
.footer-tags span {
    font-size: 0.75rem;
    padding: 4px 12px;
    border-radius: 20px;
    background: rgba(0, 212, 255, 0.07);
    color: var(--cyan);
    border: 1px solid rgba(0, 212, 255, 0.15);
}
.footer-divider { width: 60px; height: 1px; background: var(--border); margin: 0 auto 20px; }
.footer-copy { font-size: 0.82rem; color: var(--muted); margin-bottom: 6px; }
.footer-beian a { font-size: 0.78rem; color: var(--muted); transition: color 0.2s; }
.footer-beian a:hover { color: var(--cyan); }

/* ═══════════════════════════════════════════
   响应式
═══════════════════════════════════════════ */
@media (max-width: 1024px) {
    .adv-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
    .menu-toggle { display: flex; }
    .nav-links {
        display: none;
        position: fixed;
        top: 66px; left: 0; right: 0;
        background: rgba(6, 11, 20, 0.97);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 12px 16px 20px;
        border-bottom: 1px solid var(--border2);
        gap: 2px;
    }
    .nav-links.open { display: flex; }
    .nav-link { padding: 12px 16px; border-radius: 8px; }
    .nav-cta { display: none; }

    .hero-title { font-size: 2.4rem; }
    .hero-stats { flex-direction: column; gap: 0; padding: 20px 28px; }
    .stat-divider { width: 100%; height: 1px; margin: 12px 0; }
    .stat-card { padding: 8px 0; }

    .section-title { font-size: 2rem; }
    .section-sub { font-size: 0.95rem; }

    .advantages { padding: 70px 0; }
    .adv-grid { grid-template-columns: 1fr; gap: 14px; }

    .products { padding: 70px 0; }
    .prod-grid { grid-template-columns: 1fr; }
    .prod-grid .prod-card:nth-child(n) { grid-column: 1; }
    .prod-card-inner { flex-direction: column; }
    .prod-visual { width: 100%; min-height: 100px; }

    .services { padding: 70px 0; }
    .svc-toggle { padding: 18px 20px; gap: 14px; }
    .svc-n { font-size: 1.2rem; width: 32px; }
    .svc-body-inner { padding-left: 20px; }

    .contact { padding: 70px 0; }
    .info-card { flex-direction: column; padding: 20px; }
    .info-row {
        flex-direction: row;
        align-items: center;
        text-align: left;
        gap: 14px;
        padding: 14px 0;
        border-bottom: 1px solid var(--border);
        border-right: none;
    }
    .info-row:last-child { border-bottom: none; padding-bottom: 14px; }
    .wechat-card { padding: 28px 24px; }
    .wechat-num { font-size: 1.8rem; }
    .wechat-avatar { width: 68px; height: 68px; }
}

@media (max-width: 480px) {
    .hero-title { font-size: 2rem; }
    .hero-actions { flex-direction: column; align-items: center; }
    .btn-neon, .btn-ghost { width: 100%; justify-content: center; }
    .section-title { font-size: 1.75rem; }
    .prod-tabs { gap: 8px; }
    .prod-tab { padding: 7px 16px; font-size: 0.82rem; }
}