/* ========== Hero ========== */
.hero {
    position: relative;
    padding: 10px 0 10px;
    background: var(--bg);
    overflow: hidden;
}
.hero::before {
    content: '';
    position: absolute;
    top: -200px; right: -200px;
    width: 600px; height: 600px;
    background: radial-gradient(circle, rgba(217,79,26,.07) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
}
.hero::after {
    content: '';
    position: absolute;
    bottom: -100px; left: -100px;
    width: 400px; height: 400px;
    background: radial-gradient(circle, rgba(42,125,140,.05) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
}
.hero .container {
    display: grid;
    grid-template-columns: 1fr 3fr;
    gap: 64px;
    align-items: center;
    position: relative;
    z-index: 1;
}
.hero-content { max-width: 540px; }
.hero h1 {
    font-size: clamp(32px, 4.5vw, 52px);
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: -0.5px;
    color: var(--text-main);
    margin-bottom: 20px;
}
.hero h1 .text-gradient { display: inline; }
.hero-subtitle {
    font-size: 18px;
    color: var(--primary);
    font-weight: 500;
    margin-bottom: 12px;
    letter-spacing: .5px;
}
.hero p {
    font-size: 16px;
    line-height: 1.8;
    color: var(--text-secondary);
    margin-bottom: 32px;
}
.hero-buttons { display: flex; gap: 16px; flex-wrap: wrap; }

.hero-image {
    background-color: #963434;
    /* position: relative; */
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: 0 20px 60px var(--shadow-lg);
}
.hero-image img {
    width: 100%;
    /* height: 100%; */
    /* object-fit: cover; */
}
.hero-image-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, transparent 50%, rgba(0,0,0,.12) 100%);
}

/* ========== Stats ========== */
.stats-section {
    padding: 64px 0;
    background: var(--surface);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 32px;
}
.stat-item {
    text-align: center;
    padding: 24px 16px;
    border-radius: var(--radius-md);
    transition: all var(--transition);
    position: relative;
}
.stat-item:hover {
    background: var(--surface-alt);
}
.stat-item:hover::after {
    content: '';
    position: absolute;
    bottom: 0; left: 50%; transform: translateX(-50%);
    width: 32px; height: 2px;
    background: var(--primary);
    border-radius: 1px;
}
.stat-icon {
    width: 48px; height: 48px;
    margin: 0 auto 14px;
    background: var(--primary-light);
    border-radius: var(--radius-md);
    display: flex; align-items: center; justify-content: center;
    font-size: 20px;
    color: var(--primary);
}
.stat-number {
    font-size: 36px;
    font-weight: 800;
    color: var(--primary);
    line-height: 1.1;
    margin-bottom: 6px;
}
.stat-label {
    font-size: 14px;
    color: var(--text-secondary);
    font-weight: 500;
}

/* ========== Products ========== */
.products-section {
    padding: 96px 0 80px;
}
.section-header {
    text-align: center;
    margin-bottom: 56px;
}
.section-header .section-desc {
    margin: 0 auto;
}
.products-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}
.product-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: all var(--transition);
}
.product-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 32px var(--shadow-md);
    border-color: var(--primary-light);
}
.product-img {
    height: 220px;
    background: var(--surface-alt);
    display: flex; align-items: center; justify-content: center;
    overflow: hidden;
    position: relative;
    background: #fff;
}
.product-img i {
    font-size: 56px;
    color: var(--border);
}
.product-img img {
    max-height: 100%;
    max-width: 100%;

}
.product-tag {
    position: absolute;
    top: 14px; left: 14px;
    font-size: 11px;
    font-weight: 600;
    letter-spacing: .5px;
    text-transform: uppercase;
    color: var(--primary);
    background: var(--primary-light);
    padding: 4px 12px;
    border-radius: var(--radius-full);
}
.product-body {
    padding: 24px 24px 28px;
}
.product-body h3 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 8px;
}
.product-body p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 18px;
}
.product-body a {
    font-size: 14px;
    font-weight: 600;
    color: var(--primary);
}
.product-body a:hover { color: var(--primary-hover); }
.product-body a i { margin-left: 4px; transition: transform var(--transition); }
.product-body a:hover i { transform: translateX(4px); }

.view-all-wrap {
    text-align: center;
    margin-top: 48px;
}

/* ========== Why Choose Us ========== */
.why-section {
    padding: 96px 0;
    background: var(--surface-alt);
}
.why-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}
.why-left .section-badge { margin-bottom: 20px; }
.why-left .section-title { margin-bottom: 20px; }
.why-left p {
    font-size: 16px;
    line-height: 1.8;
    color: var(--text-secondary);
    margin-bottom: 28px;
}
.why-features {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}
.why-feature {
    display: flex;
    gap: 14px;
    align-items: flex-start;
}
.why-feature-icon {
    width: 44px; height: 44px;
    min-width: 44px;
    background: var(--primary-light);
    border-radius: var(--radius-md);
    display: flex; align-items: center; justify-content: center;
    font-size: 18px;
    color: var(--primary);
}
.why-feature h4 {
    font-size: 15px;
    font-weight: 600;
    margin-bottom: 4px;
}
.why-feature p {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 0;
}

.why-right {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}
.why-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 28px 24px;
    text-align: center;
    transition: all var(--transition);
}
.why-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px var(--shadow);
}
.why-card-icon {
    width: 56px; height: 56px;
    margin: 0 auto 16px;
    background: var(--primary-light);
    border-radius: var(--radius-md);
    display: flex; align-items: center; justify-content: center;
    font-size: 24px;
    color: var(--primary);
}
.why-card h4 {
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 8px;
}
.why-card p {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ========== 四宫格 ========== */
.grid4-section {
    padding: 80px 0;
}
.grid4 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 28px;
}
.grid4-item {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 40px 36px;
    transition: all var(--transition);
    position: relative;
    overflow: hidden;
}
.grid4-item:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 32px var(--shadow-md);
}
.grid4-item::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    opacity: 0;
    transition: opacity var(--transition);
}
.grid4-item:hover::before { opacity: 1; }
.grid4-item .section-badge { margin-bottom: 12px; }
.grid4-item h3 {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 12px;
}
.grid4-item p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.8;
}
.grid4-item .btn { margin-top: 20px; }

/* ========== Certifications ========== */
.cert-section {
    padding: 80px 0;
    background: var(--surface-alt);
    text-align: center;
}
.cert-logos {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 48px;
    flex-wrap: wrap;
    margin-top: 40px;
}
.cert-logos .cert-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
}
.cert-logos .cert-icon {
    width: 72px; height: 72px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    display: flex; align-items: center; justify-content: center;
    font-size: 28px;
    color: var(--primary);
    transition: all var(--transition);
}
.cert-logos .cert-item:hover .cert-icon {
    border-color: var(--primary);
    box-shadow: 0 4px 16px rgba(217,79,26,.12);
}
.cert-logos .cert-name {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary);
}

 /* ========== Responsive ========== */
 @media (max-width: 1200px) {
    .footer-grid { grid-template-columns: 1.5fr 1fr 1fr 1fr 1.5fr; }
}

@media (max-width: 1024px) {
    .hero .container { grid-template-columns: 1fr; gap: 40px; }
    .hero-content { max-width: 100%; }
    .hero-image img { height: 320px; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 20px; }
    .products-grid { grid-template-columns: repeat(2, 1fr); }
    .why-grid { grid-template-columns: 1fr; gap: 48px; }
    .why-right { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: 1fr 1fr 1fr 1.5fr; gap: 32px; }
}

@media (max-width: 768px) {
    .top-bar { display: none; }
    .nav-links, .nav-right .btn { display: none; }
    .hamburger { display: flex; }
    .hero { padding: 64px 0 56px; }
    .hero h1 { font-size: clamp(28px, 6vw, 40px); }
    .hero-buttons { flex-direction: column; }
    .hero-buttons .btn { width: 100%; justify-content: center; }
    .hero-image img { height: 260px; }
    .stats-grid { grid-template-columns: 1fr 1fr; gap: 16px; }
    .stat-number { font-size: 28px; }
    .products-grid { grid-template-columns: 1fr; }
    .product-img { height: 200px; }
    .why-features { grid-template-columns: 1fr; }
    .why-right { grid-template-columns: 1fr; }
    .grid4 { grid-template-columns: 1fr; }
    .grid4-item { padding: 32px 28px; }
    .cert-logos { gap: 28px; }
    .cta-box { padding: 48px 28px; }
    .footer-grid { grid-template-columns: 1fr 1fr; gap: 28px; }
    .footer-bottom { flex-direction: column; gap: 12px; text-align: center; }
}

@media (max-width: 480px) {
    .container { padding: 0 16px; }
    .hero { padding: 48px 0 40px; }
    .hero h1 { font-size: clamp(24px, 7vw, 32px); }
    .stats-grid { grid-template-columns: 1fr 1fr; gap: 12px; }
    .stat-item { padding: 16px 8px; }
    .stat-number { font-size: 24px; }
    .stat-label { font-size: 12px; }
    .section-title { font-size: clamp(22px, 5vw, 28px); }
    .why-grid { gap: 32px; }
    .grid4-item { padding: 24px 20px; }
    .cta-box { padding: 36px 20px; }
    .footer-grid { grid-template-columns: 1fr; }
}