/* ==========================================
   GlobalTrade B2B Website - Style
   ========================================== */

/* Reset & Base */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    color: #333;
    line-height: 1.7;
    overflow-x: hidden;
}

/* Colors */
:root {
    --primary: #1a3c6e;
    --primary-light: #2a5c9e;
    --accent: #e8b830;
    --accent-hover: #d4a82a;
    --dark: #0f1f3d;
    --gray: #6c757d;
    --light-bg: #f8f9fa;
    --white: #ffffff;
    --gradient: linear-gradient(135deg, #1a3c6e 0%, #2a5c9e 100%);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ======== NAVIGATION ======== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(0,0,0,0.06);
    transition: all 0.3s ease;
}
.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}
.logo {
    font-size: 24px;
    font-weight: 800;
    color: var(--primary);
    text-decoration: none;
    letter-spacing: -0.5px;
}
.logo-dot { color: var(--accent); }
.nav-links { display: flex; gap: 32px; }
.nav-links a {
    text-decoration: none;
    color: var(--dark);
    font-size: 14px;
    font-weight: 500;
    transition: color 0.2s;
    position: relative;
}
.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent);
    transition: width 0.3s;
}
.nav-links a:hover::after { width: 100%; }
.nav-links a:hover { color: var(--primary); }
.nav-actions { display: flex; align-items: center; gap: 12px; }
.lang-toggle {
    background: transparent;
    border: 2px solid var(--primary);
    color: var(--primary);
    padding: 6px 14px;
    border-radius: 20px;
    font-weight: 600;
    font-size: 13px;
    cursor: pointer;
    transition: all 0.2s;
}
.lang-toggle:hover { background: var(--primary); color: white; }
.menu-toggle { display: none; font-size: 24px; background: none; border: none; cursor: pointer; }

/* ======== HERO ======== */
.hero {
    min-height: 100vh;
    background: var(--gradient);
    position: relative;
    display: flex;
    align-items: center;
    padding-top: 70px;
}
.hero-overlay {
    position: absolute;
    inset: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1440 320"><path fill="rgba(255,255,255,0.03)" d="M0,96L48,112C96,128,192,160,288,186.7C384,213,480,235,576,213.3C672,192,768,128,864,128C960,128,1056,192,1152,208C1248,224,1344,192,1392,176L1440,160L1440,320L1392,320C1344,320,1248,320,1152,320C1056,320,960,320,864,320C768,320,672,320,576,320C480,320,384,320,288,320C192,320,96,320,48,320L0,320Z"></path></svg>') no-repeat bottom;
    background-size: cover;
    opacity: 0.5;
}
.hero-content {
    position: relative;
    z-index: 2;
    color: white;
    text-align: center;
}
.hero-title {
    font-size: clamp(2.2rem, 5vw, 3.5rem);
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 20px;
}
.hero-subtitle {
    font-size: clamp(1.1rem, 2.5vw, 1.5rem);
    font-weight: 600;
    color: var(--accent);
    margin-bottom: 12px;
}
.hero-desc {
    font-size: 1.1rem;
    opacity: 0.85;
    max-width: 600px;
    margin: 0 auto 36px;
}
.hero-btns { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.btn {
    display: inline-block;
    padding: 14px 36px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    font-size: 15px;
    transition: all 0.3s ease;
    cursor: pointer;
    border: none;
}
.btn-primary {
    background: var(--accent);
    color: var(--dark);
}
.btn-primary:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(232,184,48,0.4);
}
.btn-outline {
    background: transparent;
    color: white;
    border: 2px solid rgba(255,255,255,0.6);
}
.btn-outline:hover {
    border-color: white;
    background: rgba(255,255,255,0.1);
}
.hero-stats {
    display: flex;
    justify-content: center;
    gap: 60px;
    margin-top: 60px;
    flex-wrap: wrap;
}
.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
}
.stat-num {
    font-size: 2.2rem;
    font-weight: 800;
    color: var(--accent);
}
.stat-item span:last-child {
    font-size: 0.85rem;
    opacity: 0.8;
    margin-top: 4px;
}

/* ======== SECTION COMMON ======== */
.section {
    padding: 100px 0;
}
.section-header {
    text-align: center;
    margin-bottom: 60px;
}
.section-header h2 {
    font-size: 2rem;
    color: var(--dark);
    margin-bottom: 12px;
}
.divider {
    width: 60px;
    height: 3px;
    background: var(--accent);
    margin: 0 auto 16px;
    border-radius: 2px;
}
.section-header p {
    color: var(--gray);
    font-size: 1rem;
}

/* ======== ABOUT ======== */
.about { background: var(--white); }
.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}
.about-text h3 {
    font-size: 1.4rem;
    color: var(--primary);
    margin-bottom: 16px;
}
.about-text p {
    color: #555;
    margin-bottom: 14px;
}
.about-features { margin-top: 20px; }
.about-feature {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 10px;
    font-size: 0.95rem;
}
.about-feature i { color: #28a745; font-size: 1.1rem; }
.about-img-placeholder {
    background: linear-gradient(135deg, #e8f0fe, #d4e2f7);
    border-radius: 16px;
    height: 400px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 12px;
    color: var(--primary);
}
.about-img-placeholder i { font-size: 4rem; opacity: 0.5; }
.about-img-placeholder span { font-size: 1.2rem; opacity: 0.6; }

/* ======== PRODUCTS ======== */
.products { background: var(--light-bg); }
.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}
.product-card {
    background: white;
    padding: 40px 30px;
    border-radius: 16px;
    text-align: center;
    transition: all 0.3s ease;
    box-shadow: 0 2px 10px rgba(0,0,0,0.04);
    border: 1px solid rgba(0,0,0,0.04);
}
.product-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 15px 40px rgba(0,0,0,0.08);
    border-color: var(--accent);
}
.product-icon i {
    font-size: 2.5rem;
    color: var(--primary);
    background: var(--light-bg);
    width: 70px;
    height: 70px;
    line-height: 70px;
    border-radius: 20px;
    margin-bottom: 20px;
}
.product-card h3 { margin-bottom: 12px; color: var(--dark); }
.product-card p { color: var(--gray); font-size: 0.9rem; }

/* ======== ADVANTAGES ======== */
.advantages { background: var(--white); }
.adv-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}
.adv-card {
    padding: 40px 30px;
    border-left: 3px solid var(--accent);
    background: var(--light-bg);
    border-radius: 0 16px 16px 0;
    transition: all 0.3s ease;
}
.adv-card:hover { transform: translateX(4px); }
.adv-num {
    font-size: 2.5rem;
    font-weight: 800;
    color: rgba(26,60,110,0.08);
    margin-bottom: 8px;
    line-height: 1;
}
.adv-card h3 { color: var(--primary); margin-bottom: 10px; }
.adv-card p { color: var(--gray); font-size: 0.9rem; }



/* License cert-item with preview */
.cert-license-item {
    cursor: pointer;
    position: relative;
}
.cert-license-item img {
    height: 40px;
    border-radius: 4px;
    transition: transform 0.3s ease;
}
.cert-license-item:hover img {
    transform: scale(1.05);
}
.cert-license-item:hover::after {
    content: "点击查看大图";
    position: absolute;
    bottom: -22px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 11px;
    color: #999;
    white-space: nowrap;
}

/* ======== GALLERY ======== */
.gallery { background: var(--white); }
.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 30px;
}
.gallery-item {
    transition: transform 0.3s ease;
    cursor: pointer;
}
.gallery-item:hover { transform: translateY(-4px); }
.gallery-item img { transition: box-shadow 0.3s ease; }
.gallery-item:hover img { box-shadow: 0 10px 30px rgba(0,0,0,0.15) !important; }
@media (max-width: 600px) {
    .gallery-grid { grid-template-columns: 1fr 1fr; }
}

/* ======== CERTIFICATIONS ======== */
.cert { background: var(--light-bg); }
.cert-grid {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 20px;
    margin-bottom: 40px;
}
.cert-item {
    background: white;
    padding: 20px 30px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 600;
    color: var(--primary);
    box-shadow: 0 2px 10px rgba(0,0,0,0.04);
    border: 1px solid rgba(0,0,0,0.04);
}
.cert-item i { color: var(--accent); font-size: 1.3rem; }
.cert-cta {
    text-align: center;
    margin-top: 20px;
}
.cert-cta p { margin-bottom: 20px; color: var(--gray); }

/* ======== CONTACT ======== */
.contact { background: var(--white); }
.contact-wrapper {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: 50px;
}
.contact-form input,
.contact-form select,
.contact-form textarea {
    width: 100%;
    padding: 14px 18px;
    border: 1px solid #dee2e6;
    border-radius: 10px;
    font-size: 14px;
    margin-bottom: 16px;
    transition: border-color 0.2s;
    background: var(--light-bg);
    font-family: inherit;
}
.contact-form input:focus,
.contact-form select:focus,
.contact-form textarea:focus {
    outline: none;
    border-color: var(--primary);
}
.contact-form .btn-block { width: 100%; }
.contact-info { display: flex; flex-direction: column; gap: 30px; }
.contact-item {
    display: flex;
    gap: 16px;
}
.contact-item i {
    font-size: 1.3rem;
    color: var(--primary);
    margin-top: 4px;
    width: 24px;
}
.contact-item h4 { font-size: 0.95rem; color: var(--dark); margin-bottom: 4px; }
.contact-item p { color: var(--gray); font-size: 0.9rem; line-height: 1.6; }

/* ======== FOOTER ======== */
.footer {
    background: var(--dark);
    color: rgba(255,255,255,0.8);
    padding: 70px 0 0;
}
.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: 40px;
    padding-bottom: 50px;
    border-bottom: 1px solid rgba(255,255,255,0.06);
}
.footer .logo { color: white; }
.footer-brand p { margin: 16px 0 20px; font-size: 0.9rem; line-height: 1.6; }
.footer-social { display: flex; gap: 12px; }
.footer-social a {
    color: rgba(255,255,255,0.6);
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: 1px solid rgba(255,255,255,0.15);
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    transition: all 0.2s;
}
.footer-social a:hover { background: var(--accent); color: var(--dark); border-color: var(--accent); }
.footer-links h4,
.footer-newsletter h4 {
    color: white;
    margin-bottom: 20px;
    font-size: 1rem;
}
.footer-links a {
    display: block;
    color: rgba(255,255,255,0.6);
    text-decoration: none;
    font-size: 0.9rem;
    margin-bottom: 10px;
    transition: color 0.2s;
}
.footer-links a:hover { color: var(--accent); }
.footer-newsletter p { font-size: 0.85rem; margin-bottom: 16px; }
.footer-newsletter form {
    display: flex;
    border: 1px solid rgba(255,255,255,0.15);
    border-radius: 50px;
    overflow: hidden;
}
.footer-newsletter input {
    flex: 1;
    background: transparent;
    border: none;
    padding: 12px 16px;
    color: white;
    font-size: 0.85rem;
    outline: none;
}
.footer-newsletter input::placeholder { color: rgba(255,255,255,0.4); }
.footer-newsletter button {
    background: var(--accent);
    border: none;
    color: var(--dark);
    padding: 0 20px;
    cursor: pointer;
    transition: background 0.2s;
}
.footer-newsletter button:hover { background: var(--accent-hover); }
.footer-bottom {
    display: flex;
    justify-content: space-between;
    padding: 24px 0;
    font-size: 0.85rem;
    color: rgba(255,255,255,0.4);
    flex-wrap: wrap;
    gap: 8px;
}
.footer-bottom i { color: #e74c3c; }

/* ======== RESPONSIVE ======== */
@media (max-width: 992px) {
    .about-content,
    .contact-wrapper { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr 1fr; }
    .hero-stats { gap: 30px; }
}

@media (max-width: 768px) {
    .nav-links {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: 20px;
        gap: 16px;
        box-shadow: 0 10px 30px rgba(0,0,0,0.08);
        display: none;
    }
    .nav-links.show { display: flex; }
    .menu-toggle { display: block; }
    .section { padding: 60px 0; }
    .hero-title { font-size: 1.8rem; }
    .footer-grid { grid-template-columns: 1fr; }
}