/* === Reset & Base === */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 88px; }
body {
    font-family: 'Noto Sans SC', 'Helvetica Neue', Arial, 'PingFang SC', 'Microsoft YaHei', sans-serif;
    line-height: 1.7;
    color: #2c3e50;
    background: #fff;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }

/* === Navigation === */
#navbar {
    position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
    background: rgba(10, 25, 58, 0.92);
    backdrop-filter: blur(12px);
    transition: all 0.3s ease;
    padding: 0;
}
#navbar.scrolled {
    background: rgba(10, 25, 58, 0.98);
    box-shadow: 0 2px 20px rgba(0,0,0,0.15);
}
.nav-flex {
    display: flex; align-items: center; justify-content: space-between;
    height: 72px;
}
.logo {
    display: flex; align-items: center; gap: 12px;
    font-weight: 700; font-size: 1.1rem; color: #fff;
}
.logo-icon {
    display: inline-flex; align-items: center; justify-content: center;
    width: 42px; height: 42px;
    background: linear-gradient(135deg, #00b4d8, #0077b6);
    border-radius: 10px;
    font-weight: 900; font-size: 1rem; color: #fff;
    letter-spacing: 1px;
}
.logo-text { font-size: 1.2rem; letter-spacing: 2px; }

#nav-menu ul {
    display: flex; gap: 8px;
}
#nav-menu a {
    display: block; padding: 8px 16px;
    color: rgba(255,255,255,0.8);
    font-size: 0.92rem; font-weight: 400;
    border-radius: 6px;
    transition: all 0.2s;
}
#nav-menu a:hover { color: #fff; background: rgba(255,255,255,0.1); }

.menu-toggle {
    display: none; background: none; border: none; cursor: pointer;
    flex-direction: column; gap: 5px; padding: 8px;
}
.menu-toggle span {
    display: block; width: 24px; height: 2px; background: #fff;
    border-radius: 2px; transition: 0.3s;
}

/* === Hero === */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex; align-items: center;
    background: linear-gradient(135deg, #0a193a 0%, #0d2b5e 40%, #0a3d7c 100%);
    overflow: hidden;
}
.hero::before {
    content: '';
    position: absolute; inset: 0;
    background:
        radial-gradient(circle at 20% 50%, rgba(0,180,216,0.15) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(0,119,182,0.1) 0%, transparent 40%),
        radial-gradient(circle at 60% 80%, rgba(0,180,216,0.08) 0%, transparent 40%);
}
.hero::after {
    content: '';
    position: absolute; inset: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}
.hero-content {
    position: relative; z-index: 1;
    text-align: center; padding: 120px 0 80px;
}
.hero h1 {
    font-size: 3.5rem; font-weight: 900;
    color: #fff; letter-spacing: 4px;
    margin-bottom: 16px;
    line-height: 1.3;
}
.accent {
    background: linear-gradient(90deg, #00b4d8, #48cae4);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.hero-subtitle {
    font-size: 1.4rem; color: rgba(255,255,255,0.9);
    font-weight: 500; letter-spacing: 6px;
    margin-bottom: 20px;
}
.hero-desc {
    font-size: 1.05rem; color: rgba(255,255,255,0.65);
    max-width: 640px; margin: 0 auto 40px;
    line-height: 1.8;
}
.hero-btns { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

/* === Buttons === */
.btn {
    display: inline-block; padding: 14px 36px;
    font-size: 0.95rem; font-weight: 600;
    border-radius: 8px; border: 2px solid transparent;
    cursor: pointer; transition: all 0.3s;
    letter-spacing: 1px;
}
.btn-primary {
    background: linear-gradient(135deg, #00b4d8, #0077b6);
    color: #fff; border-color: transparent;
}
.btn-primary:hover {
    background: linear-gradient(135deg, #0096c7, #005f99);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0,180,216,0.35);
}
.btn-outline {
    background: transparent; color: #fff;
    border-color: rgba(255,255,255,0.4);
}
.btn-outline:hover {
    border-color: #fff; background: rgba(255,255,255,0.1);
    transform: translateY(-2px);
}
.btn-full { width: 100%; text-align: center; }

/* === Sections === */
.section { padding: 100px 0; }
.section-light { background: #f8fafc; }
.section-dark {
    background: linear-gradient(135deg, #0a193a, #0d2b5e);
    color: #fff;
}
.section-header { text-align: center; margin-bottom: 60px; }
.section-tag {
    display: inline-block;
    font-size: 0.8rem; font-weight: 700;
    letter-spacing: 4px; color: #00b4d8;
    text-transform: uppercase;
    margin-bottom: 12px;
}
.section-header.light .section-tag { color: #48cae4; }
.section-header h2 {
    font-size: 2.2rem; font-weight: 800;
    letter-spacing: 2px; margin-bottom: 16px;
}
.section-line {
    width: 60px; height: 3px;
    background: linear-gradient(90deg, #00b4d8, #0077b6);
    margin: 0 auto; border-radius: 2px;
}

/* === About === */
.about-grid {
    display: grid; grid-template-columns: 1.2fr 0.8fr;
    gap: 60px; align-items: center;
}
.about-text p {
    font-size: 1.02rem; color: #555;
    margin-bottom: 20px; line-height: 1.9;
}
.about-text strong { color: #0a193a; font-weight: 700; }
.about-stats {
    display: grid; grid-template-columns: 1fr 1fr;
    gap: 24px;
}
.stat-item {
    text-align: center;
    padding: 28px 16px;
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.06);
    transition: transform 0.3s;
}
.stat-item:hover { transform: translateY(-4px); }
.stat-number {
    display: block;
    font-size: 2.2rem; font-weight: 900;
    background: linear-gradient(135deg, #00b4d8, #0077b6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.stat-label {
    display: block;
    font-size: 0.88rem; color: #888;
    margin-top: 6px; font-weight: 500;
}

/* === Products === */
.product-grid {
    display: grid; grid-template-columns: repeat(2, 1fr);
    gap: 30px;
}
.product-card {
    background: #fff;
    border-radius: 16px;
    padding: 40px 32px;
    box-shadow: 0 4px 24px rgba(0,0,0,0.06);
    transition: all 0.3s;
    border: 1px solid #eef2f7;
}
.product-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 12px 40px rgba(0,0,0,0.1);
    border-color: #00b4d8;
}
.product-icon {
    width: 56px; height: 56px;
    margin-bottom: 20px; color: #0077b6;
}
.product-icon svg { width: 100%; height: 100%; }
.product-card h3 {
    font-size: 1.25rem; font-weight: 700;
    margin-bottom: 14px; color: #0a193a;
}
.product-card p {
    font-size: 0.95rem; color: #666;
    margin-bottom: 16px; line-height: 1.8;
}
.product-card ul {
    list-style: none; padding: 0;
}
.product-card li {
    position: relative;
    padding-left: 20px;
    font-size: 0.88rem; color: #555;
    margin-bottom: 8px;
}
.product-card li::before {
    content: '✓';
    position: absolute; left: 0;
    color: #00b4d8; font-weight: 700;
}

/* === Advantages === */
.adv-grid {
    display: grid; grid-template-columns: repeat(2, 1fr);
    gap: 40px;
}
.adv-item {
    padding: 32px;
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: 12px;
    transition: all 0.3s;
}
.adv-item:hover {
    border-color: rgba(0,180,216,0.4);
    background: rgba(255,255,255,0.05);
}
.adv-num {
    font-size: 2.5rem; font-weight: 900;
    background: linear-gradient(135deg, #00b4d8, #48cae4);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 12px;
}
.adv-item h3 {
    font-size: 1.2rem; font-weight: 700;
    margin-bottom: 10px;
}
.adv-item p {
    font-size: 0.92rem; color: rgba(255,255,255,0.7);
    line-height: 1.8;
}

/* === Cases === */
.cases-grid {
    display: grid; grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}
.case-item {
    background: #fff;
    border-radius: 12px;
    padding: 32px 24px;
    text-align: center;
    box-shadow: 0 2px 16px rgba(0,0,0,0.05);
    transition: all 0.3s;
    border: 1px solid #eef2f7;
}
.case-item:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 30px rgba(0,0,0,0.1);
}
.case-icon { font-size: 2.4rem; margin-bottom: 16px; }
.case-item h4 {
    font-size: 1.1rem; font-weight: 700;
    color: #0a193a; margin-bottom: 10px;
}
.case-item p {
    font-size: 0.88rem; color: #777;
    line-height: 1.7;
}

/* === Contact === */
.contact-grid {
    display: grid; grid-template-columns: 1fr 1fr;
    gap: 50px;
    align-items: start;
}
.contact-item {
    display: flex; gap: 16px;
    margin-bottom: 28px;
    padding: 20px;
    background: #f8fafc;
    border-radius: 10px;
    transition: all 0.3s;
}
.contact-item:hover {
    background: #eef6fa;
    transform: translateX(4px);
}
.contact-icon { font-size: 1.6rem; flex-shrink: 0; }
.contact-item h4 {
    font-size: 0.95rem; font-weight: 700;
    color: #0a193a; margin-bottom: 4px;
}
.contact-item p { font-size: 0.9rem; color: #666; }

.contact-form-wrap h3 {
    font-size: 1.3rem; font-weight: 700;
    margin-bottom: 20px; color: #0a193a;
}
.contact-form input,
.contact-form textarea {
    width: 100%; padding: 14px 18px;
    font-size: 0.95rem; font-family: inherit;
    border: 1px solid #dde3ea;
    border-radius: 8px; outline: none;
    transition: border-color 0.2s;
    background: #f8fafc;
    margin-bottom: 14px;
}
.contact-form input:focus,
.contact-form textarea:focus {
    border-color: #00b4d8;
    background: #fff;
}
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.form-row input { margin-bottom: 14px; }

/* === Footer === */
#footer {
    background: #0a193a;
    color: rgba(255,255,255,0.7);
    padding: 60px 0 0;
}
.footer-grid {
    display: grid; grid-template-columns: 1.2fr 1fr 1fr;
    gap: 40px;
    padding-bottom: 40px;
    border-bottom: 1px solid rgba(255,255,255,0.08);
}
.footer-brand .logo-icon {
    margin-bottom: 12px;
}
.footer-brand p {
    font-size: 1rem; font-weight: 600;
    color: #fff; margin-bottom: 4px;
}
.footer-slogan {
    font-size: 0.88rem !important;
    color: rgba(255,255,255,0.5) !important;
    font-weight: 400 !important;
}
.footer-links h4 {
    font-size: 0.95rem; font-weight: 700;
    color: #fff; margin-bottom: 16px;
    letter-spacing: 1px;
}
.footer-links a {
    display: block; font-size: 0.88rem;
    color: rgba(255,255,255,0.55);
    margin-bottom: 10px;
    transition: color 0.2s;
}
.footer-links a:hover { color: #00b4d8; }

.footer-bottom {
    text-align: center;
    padding: 20px 0;
    font-size: 0.82rem;
    color: rgba(255,255,255,0.35);
}
.footer-bottom a { color: rgba(255,255,255,0.5); }
.footer-bottom a:hover { color: #00b4d8; }

/* === Back to Top === */
#back-top {
    position: fixed; bottom: 30px; right: 30px;
    width: 44px; height: 44px;
    background: linear-gradient(135deg, #00b4d8, #0077b6);
    color: #fff; border: none; border-radius: 50%;
    font-size: 1.2rem; cursor: pointer;
    opacity: 0; visibility: hidden;
    transition: all 0.3s;
    box-shadow: 0 4px 15px rgba(0,180,216,0.4);
    z-index: 999;
}
#back-top.show { opacity: 1; visibility: visible; }
#back-top:hover { transform: translateY(-3px); }

/* === Product Detail === */
.product-detail { padding-top: 100px; }
.breadcrumb {
    padding: 16px 0 30px;
    font-size: 0.88rem; color: #999;
}
.breadcrumb a { color: #0077b6; }
.breadcrumb a:hover { text-decoration: underline; }

.detail-grid {
    display: grid; grid-template-columns: 1fr 1fr;
    gap: 50px; align-items: start;
    margin-bottom: 60px;
}
.detail-image { position: sticky; top: 90px; }
.img-placeholder {
    background: #f8fafc; border: 2px dashed #dde3ea;
    border-radius: 16px; padding: 40px;
    text-align: center;
}
.img-placeholder svg { width: 200px; height: 200px; margin: 0 auto 16px; }
.img-note { font-size: 0.85rem; color: #aaa; }
.product-photo {
    width: 100%; border-radius: 16px;
    box-shadow: 0 8px 30px rgba(0,0,0,0.12);
}

.product-badge {
    display: inline-block;
    background: linear-gradient(135deg, #e0f7fa, #b2ebf2);
    color: #0077b6; font-size: 0.8rem; font-weight: 700;
    padding: 4px 14px; border-radius: 20px;
    margin-bottom: 12px; letter-spacing: 1px;
}
.detail-summary h1 {
    font-size: 2rem; font-weight: 800;
    color: #0a193a; margin-bottom: 8px;
    line-height: 1.3;
}
.detail-subtitle {
    font-size: 1rem; color: #0077b6;
    font-weight: 500; margin-bottom: 16px;
}
.detail-desc {
    font-size: 0.95rem; color: #555;
    line-height: 1.8; margin-bottom: 24px;
}

.key-specs {
    display: grid; grid-template-columns: repeat(2, 1fr);
    gap: 16px; margin-bottom: 24px;
}
.spec-item {
    background: #f8fafc; border-radius: 10px;
    padding: 16px; text-align: center;
    border: 1px solid #eef2f7;
}
.spec-val {
    display: block;
    font-size: 1.4rem; font-weight: 800;
    background: linear-gradient(135deg, #00b4d8, #0077b6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.spec-key {
    display: block;
    font-size: 0.78rem; color: #888;
    margin-top: 4px;
}

.detail-tags { display: flex; flex-wrap: wrap; gap: 8px; }
.detail-tags span {
    background: #eef6fa; color: #0077b6;
    font-size: 0.78rem; font-weight: 600;
    padding: 4px 12px; border-radius: 4px;
}

/* Detail Sections */
.detail-section { margin-bottom: 60px; }
.detail-section h2 {
    font-size: 1.6rem; font-weight: 800;
    color: #0a193a; margin-bottom: 30px;
    padding-bottom: 12px;
    border-bottom: 3px solid #00b4d8;
    display: inline-block;
}

/* Feature Grid */
.feature-grid {
    display: grid; grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}
.feature-card {
    background: #f8fafc; border-radius: 12px;
    padding: 28px 24px;
    border: 1px solid #eef2f7;
    transition: all 0.3s;
}
.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0,0,0,0.08);
    border-color: #00b4d8;
}
.feature-icon { font-size: 2rem; margin-bottom: 12px; }
.feature-card h4 {
    font-size: 1.05rem; font-weight: 700;
    color: #0a193a; margin-bottom: 8px;
}
.feature-card p {
    font-size: 0.88rem; color: #666;
    line-height: 1.7;
}

/* Spec Table */
.spec-table-wrap { overflow-x: auto; }
.spec-table {
    width: 100%; border-collapse: collapse;
    font-size: 0.92rem;
}
.spec-table th, .spec-table td {
    padding: 14px 20px;
    text-align: left;
    border-bottom: 1px solid #eef2f7;
}
.spec-table th {
    background: #0a193a; color: #fff;
    font-weight: 600; letter-spacing: 1px;
}
.spec-table td:first-child { color: #555; font-weight: 500; }
.spec-table td:last-child { color: #0a193a; font-weight: 600; }
.spec-table tr:hover td { background: #f8fafc; }
.config-table thead th {
    background: linear-gradient(135deg, #0077b6, #00b4d8);
}

/* Standards */
.standards-grid {
    display: grid; grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}
.std-card {
    background: #f8fafc; border-radius: 10px;
    padding: 20px; text-align: center;
    border: 1px solid #eef2f7;
    transition: all 0.3s;
}
.std-card:hover { border-color: #00b4d8; }
.std-card strong {
    display: block;
    font-size: 1rem; color: #0a193a;
    margin-bottom: 6px;
}
.std-card span {
    font-size: 0.82rem; color: #888;
}

/* Service */
.service-grid {
    display: grid; grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}
.service-item {
    text-align: center;
    padding: 30px 20px;
    background: #f8fafc; border-radius: 12px;
    border: 1px solid #eef2f7;
}
.service-icon { font-size: 2.2rem; margin-bottom: 14px; }
.service-item h4 {
    font-size: 1rem; font-weight: 700;
    color: #0a193a; margin-bottom: 8px;
}
.service-item p {
    font-size: 0.85rem; color: #666;
    line-height: 1.6;
}

/* CTA */
.detail-cta {
    text-align: center;
    background: linear-gradient(135deg, #0a193a, #0d2b5e);
    color: #fff;
    padding: 60px 40px;
    border-radius: 16px;
    margin-top: 40px;
}
.detail-cta h2 {
    font-size: 1.8rem; font-weight: 800;
    margin-bottom: 12px; border: none;
    display: block; padding: 0;
    color: #fff;
}
.detail-cta p {
    font-size: 1rem; color: rgba(255,255,255,0.7);
    margin-bottom: 28px;
}

/* === Responsive === */
@media (max-width: 768px) {
    .menu-toggle { display: flex; }
    #nav-menu {
        position: fixed; top: 72px; left: 0; right: 0;
        background: rgba(10, 25, 58, 0.98);
        padding: 20px;
        transform: translateY(-120%);
        transition: transform 0.3s;
    }
    #nav-menu.open { transform: translateY(0); }
    #nav-menu ul { flex-direction: column; gap: 4px; }
    #nav-menu a { padding: 12px 16px; font-size: 1rem; }

    .hero h1 { font-size: 2.2rem; }
    .hero-subtitle { font-size: 1.1rem; letter-spacing: 3px; }
    .hero-desc { font-size: 0.95rem; }

    .about-grid { grid-template-columns: 1fr; gap: 40px; }
    .about-stats { grid-template-columns: 1fr 1fr; }
    .product-grid { grid-template-columns: 1fr; }
    .adv-grid { grid-template-columns: 1fr; }
    .cases-grid { grid-template-columns: 1fr; }
    .contact-grid { grid-template-columns: 1fr; gap: 30px; }
    .contact-item:hover { transform: none; }
    .footer-grid { grid-template-columns: 1fr; }
    .footer-brand { margin-bottom: 8px; }
    .form-row { grid-template-columns: 1fr; }

    .detail-grid { grid-template-columns: 1fr; }
    .detail-image { position: static; }
    .feature-grid { grid-template-columns: 1fr; }
    .standards-grid { grid-template-columns: 1fr 1fr; }
    .service-grid { grid-template-columns: 1fr 1fr; }
    .key-specs { grid-template-columns: 1fr 1fr; }
    .detail-summary h1 { font-size: 1.5rem; }
    .detail-section h2 { font-size: 1.3rem; }

    .section { padding: 60px 0; }
    .section-header h2 { font-size: 1.8rem; }
}

@media (max-width: 480px) {
    .container { padding: 0 18px; }
    .hero-content { padding-top: 108px; }
    .hero h1 { font-size: 1.85rem; letter-spacing: 2px; }
    .hero-subtitle { font-size: 0.98rem; letter-spacing: 1px; }
    .hero-desc { font-size: 0.92rem; }
    .btn { width: 100%; text-align: center; }
    .hero-btns { gap: 12px; }
    .about-stats, .key-specs, .standards-grid, .service-grid { grid-template-columns: 1fr; }
    .stat-item, .spec-item, .std-card, .service-item { padding: 20px 16px; }
    .product-card, .feature-card, .case-item, .contact-item { padding: 24px 18px; }
    .detail-summary h1 { font-size: 1.35rem; }
    .detail-section h2 { font-size: 1.2rem; }
    .spec-table th, .spec-table td { padding: 12px 14px; }
    #back-top { right: 18px; bottom: 18px; }
}