The main issue was that `.hero-section::after` had a dark pseudo-element overlay (`z-index: 2`) blocking the background image, and there were two conflicting `.accordion-content` definitions.

Here is your **complete CSS** with all fixes applied (hero background image displaying on mobile, fixed service arrows, and mobile menu / accordion fixes):

```css
/* Base Reset & Styling */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

body {
    background-color: #121212;
    color: #f1f1f1;
    line-height: 1.6;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Top Emergency Bar */
.top-bar {
    background-color: #1a1a1a;
    padding: 10px 0;
    font-size: 0.9rem;
    border-bottom: 1px solid #2a2a2a;
}
.top-bar .container {
    display: flex;
    align-items: center;
    gap: 8px;
}
.emergency-text {
    color: #ff6b1a;
    display: flex;
    align-items: center;
    gap: 6px;
}
.emergency-number {
    color: #ffffff;
    font-weight: 700;
    text-decoration: none;
}

/* Header */
.site-header {
    background-color: #121212;
    padding: 15px 0;
    border-bottom: 1px solid #222;
    position: sticky;
    top: 0;
    z-index: 1000;
}
.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.logo-wrap a {
    text-decoration: none;
    font-size: 1.8rem;
    font-weight: 800;
}
.logo-spd {
    background: #ff6b1a;
    color: #121212;
    padding: 2px 8px;
    border-radius: 4px;
}
.logo-trees {
    color: #ffffff;
    margin-left: 4px;
}
.header-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}
.btn-call-now {
    background-color: #ff6b1a;
    color: #121212;
    padding: 8px 16px;
    border-radius: 4px;
    text-decoration: none;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.95rem;
}
.menu-toggle {
    background: #1e1e1e;
    border: none;
    color: #fff;
    padding: 10px 14px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 1.1rem;
}

/* Hero Section */
.hero-section {
    position: relative;
    padding: 80px 0;
    overflow: hidden;
}

/* Mobile Hero Background Fix */
@media (max-width: 768px) {
    .hero-section {
        background: linear-gradient(rgba(18, 18, 18, 0.75), rgba(18, 18, 18, 0.88)), 
                    url('https://aimhighonline.co.uk/websites/spd-trees-new/images/background.jpg') center/cover no-repeat !important;
    }
    
    .hero-section::after {
        display: none !important; /* Removes pseudo-element covering background on mobile */
    }
    
    .hero-bg-img {
        display: none !important; /* Hides image tag on mobile */
    }
    
    .hero-content {
        position: relative;
        z-index: 3;
    }
}

.hero-section::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(rgba(18,18,18,0.9), rgba(18,18,18,0.95)), #121212;
    z-index: 2;
}
.hero-content {
    position: relative;
    z-index: 3;
}
.sub-badge {
    color: #ff6b1a;
    font-weight: 700;
    font-size: 0.85rem;
    letter-spacing: 1px;
    margin-bottom: 15px;
    display: inline-block;
}
.hero-content h1 {
    font-size: 2.5rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 20px;
    color: #fff;
}
.hero-content h1 span {
    color: #ff6b1a;
}
.hero-content p {
    color: #ccc;
    font-size: 1.05rem;
    margin-bottom: 30px;
    max-width: 600px;
}
.btn-primary-orange {
    background-color: #ff6b1a;
    color: #121212;
    padding: 14px 24px;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 700;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 30px;
}
.hero-pills {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}
.pill {
    background: #1a1a1a;
    border: 1px solid #2a2a2a;
    padding: 6px 12px;
    border-radius: 4px;
    font-size: 0.85rem;
    color: #ddd;
    display: flex;
    align-items: center;
    gap: 6px;
}
.pill span {
    color: #ff6b1a;
}

/* Stats Section */
.stats-section {
    padding: 40px 0;
    background: #161616;
    border-top: 1px solid #222;
    border-bottom: 1px solid #222;
}
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 20px;
}
.stat-card {
    background: #1c1c1c;
    border: 1px solid #282828;
    padding: 20px;
    border-radius: 6px;
}
.stat-num {
    font-size: 2rem;
    font-weight: 800;
    color: #ff6b1a;
    margin-bottom: 5px;
}
.stat-label {
    font-size: 0.75rem;
    letter-spacing: 1px;
    color: #aaa;
    font-weight: 700;
}

/* Testimonials */
.testimonials-section {
    padding: 60px 0;
    background: #121212;
}
.section-tag {
    color: #ff6b1a;
    font-size: 0.75rem;
    font-weight: 800;
    letter-spacing: 1.5px;
    margin-bottom: 10px;
}
.testimonials-section h2 {
    font-size: 2rem;
    margin-bottom: 30px;
}
.testimonial-card {
    background: #181818;
    border: 1px solid #262626;
    border-radius: 8px;
    padding: 30px;
    margin-bottom: 20px;
    position: relative;
}
.quote-icon {
    color: #ff6b1a;
    font-size: 2.5rem;
    line-height: 1;
    margin-bottom: 10px;
}
.testimonial-card p {
    color: #d1d1d1;
    font-size: 1rem;
    margin-bottom: 20px;
}
.customer-info {
    display: flex;
    align-items: center;
    gap: 12px;
}
.avatar-initial {
    width: 36px;
    height: 36px;
    background: #2a2a2a;
    color: #ff6b1a;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    font-weight: bold;
}
.customer-details .name {
    display: block;
    font-weight: bold;
    font-size: 0.9rem;
}
.customer-details .location {
    color: #888;
    font-size: 0.8rem;
}
.reviews-badges-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 20px;
    margin-top: 30px;
}
.review-platform-card {
    background: #181818;
    border: 1px solid #262626;
    padding: 25px;
    border-radius: 8px;
}
.rating-row {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 10px;
}
.rating-row .score {
    font-size: 1.8rem;
    font-weight: bold;
}
.stars {
    color: #ff6b1a;
    font-size: 0.85rem;
}
.review-source-text {
    color: #aaa;
    font-size: 0.85rem;
    margin-bottom: 15px;
}
.link-arrow {
    color: #ff6b1a;
    text-decoration: none;
    font-weight: bold;
    font-size: 0.9rem;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

/* Services Section */
.services-section {
    padding: 60px 0;
    background: #151515;
}
.service-intro-header {
    margin-bottom: 40px;
}
.service-intro-header h2 {
    font-size: 2.2rem;
    margin-bottom: 10px;
}
.service-intro-header p {
    color: #aaa;
}
.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
}
.service-box {
    background: #1b1b1b;
    border: 1px solid #262626;
    padding: 30px;
    border-radius: 8px;
    position: relative;
    display: flex;
    flex-direction: column;
}
.service-badge-top {
    font-size: 0.7rem;
    font-weight: 800;
    color: #ff6b1a;
    background: rgba(255, 107, 26, 0.1);
    padding: 4px 8px;
    border-radius: 4px;
    align-self: flex-start;
    margin-bottom: 15px;
    letter-spacing: 0.5px;
}
.orange-tag {
    background: #ff6b1a;
    color: #121212;
}
.service-icon {
    font-size: 1.8rem;
    color: #ff6b1a;
    margin-bottom: 20px;
}
.service-box h3 {
    font-size: 1.25rem;
    margin-bottom: 12px;
    color: #fff;
}
.service-box p {
    color: #aaa;
    font-size: 0.95rem;
}

/* Service Card Arrow Links (Overrides default blue link behavior) */
.service-box a,
.service-box a:visited,
.card-link {
    color: #ff6b1a !important;
    text-decoration: none !important;
    background: #222;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    border-radius: 6px;
    margin-top: 15px;
}

.card-link:hover {
    background: #ff6b1a;
    color: #121212 !important;
}

/* How We Work */
.how-we-work {
    padding: 60px 0;
    background: #121212;
}
.how-we-work h2 {
    font-size: 2rem;
    margin-bottom: 10px;
}
.section-desc {
    color: #aaa;
    margin-bottom: 40px;
}
.steps-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 20px;
}
.step-card {
    background: #181818;
    border: 1px solid #262626;
    padding: 30px;
    border-radius: 8px;
    position: relative;
}
.step-number {
    position: absolute;
    top: 20px;
    right: 20px;
    font-size: 1.8rem;
    font-weight: 800;
    color: #262626;
}
.step-icon {
    color: #ff6b1a;
    font-size: 1.5rem;
    margin-bottom: 20px;
}
.step-card h3 {
    font-size: 1.1rem;
    margin-bottom: 10px;
}
.step-card p {
    color: #999;
    font-size: 0.9rem;
}

/* Latest Work Gallery */
.latest-work {
    padding: 60px 0;
    background: #151515;
}
.latest-work h2 {
    font-size: 2rem;
    margin-bottom: 10px;
}
.project-showcase {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 20px;
    margin-top: 30px;
}
@media (max-width: 768px) {
    .project-showcase {
        grid-template-columns: 1fr;
    }
}
.project-main-card, .project-thumb {
    background: #1b1b1b;
    border: 1px solid #262626;
    border-radius: 8px;
    overflow: hidden;
    position: relative;
    min-height: 280px;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
}
.project-main-card img, .project-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    position: absolute;
    top: 0;
    left: 0;
}
.project-caption {
    background: rgba(18, 18, 18, 0.9);
    border-top: 1px solid #262626;
    padding: 20px;
    z-index: 2;
}
.project-caption .badge {
    background: #ff6b1a;
    color: #121212;
    font-size: 0.65rem;
    font-weight: 800;
    padding: 3px 6px;
    border-radius: 3px;
    display: inline-block;
    margin-bottom: 6px;
}
.project-caption h3 {
    font-size: 1.1rem;
    color: #fff;
}
.project-side-grid {
    display: flex;
    flex-direction: column;
    gap: 20px;
}
.project-thumb {
    min-height: 130px;
}
.project-caption-sm {
    background: rgba(18, 18, 18, 0.9);
    padding: 12px;
    z-index: 2;
    border-top: 1px solid #262626;
}
.project-caption-sm .badge {
    background: #ff6b1a;
    color: #121212;
    font-size: 0.6rem;
    font-weight: 800;
    padding: 2px 5px;
    border-radius: 2px;
    display: inline-block;
    margin-bottom: 4px;
}
.project-caption-sm h4 {
    font-size: 0.95rem;
}

/* Regulations & Protected Trees */
.regulations-section {
    padding: 60px 0;
    background: #121212;
}
.regulations-section h2 {
    font-size: 2rem;
    margin-bottom: 20px;
}
.regulations-section p {
    color: #aaa;
    margin-bottom: 20px;
    max-width: 800px;
}
.btn-dark-outline {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    border: 1px solid #333;
    background: #181818;
    color: #fff;
    padding: 12px 20px;
    border-radius: 6px;
    text-decoration: none;
    font-weight: bold;
    margin: 20px 0 40px 0;
}
.reg-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 20px;
}
.reg-card {
    background: #181818;
    border: 1px solid #262626;
    padding: 25px;
    border-radius: 8px;
}
.reg-card h3 {
    color: #ff6b1a;
    font-size: 1.8rem;
    font-weight: 800;
    margin-bottom: 10px;
}
.reg-card p {
    color: #999;
    font-size: 0.9rem;
    margin-bottom: 0;
}

/* Coverage Area */
.coverage-section {
    padding: 60px 0;
    background: #151515;
}
.coverage-section h2 {
    font-size: 2rem;
    margin-bottom: 10px;
}
.locations-list {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    list-style: none;
    margin: 30px 0;
}
.locations-list li {
    background: #1b1b1b;
    border: 1px solid #262626;
    padding: 10px 20px;
    border-radius: 6px;
    font-weight: bold;
    display: flex;
    align-items: center;
    gap: 8px;
}
.locations-list li i {
    color: #ff6b1a;
}
.map-placeholder {
    background: #181818;
    border: 1px solid #262626;
    border-radius: 8px;
    height: 300px;
    overflow: hidden;
}

/* FAQ Section & Accordion */
.faq-section {
    padding: 60px 0;
    background: #121212;
}
.faq-section h2 {
    font-size: 2rem;
    margin-bottom: 5px;
}
.faq-sub {
    color: #aaa;
    margin-bottom: 30px;
}
.faq-sub a {
    color: #ff6b1a;
    text-decoration: none;
}
.accordion-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}
.accordion-item {
    background: #181818;
    border: 1px solid #262626;
    border-radius: 6px;
    overflow: hidden;
}
.accordion-header {
    padding: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: bold;
    cursor: pointer;
}
.accordion-item.active .accordion-header {
    border-left: 4px solid #ff6b1a;
}
.acc-icon {
    color: #ff6b1a;
}
.accordion-content {
    display: none;
    padding: 0 20px 20px 20px;
    color: #aaa;
    font-size: 0.95rem;
}
.accordion-item.active .accordion-content {
    display: block;
}

/* Quote Builder / Call to Action */
.quote-builder-section {
    padding: 60px 0;
    background: #151515;
}
.orange-card-bg {
    background: #ff6b1a;
    color: #121212;
    padding: 50px 40px;
    border-radius: 12px;
}
.white-tag {
    color: #121212;
    background: rgba(255,255,255,0.2);
    display: inline-block;
    padding: 4px 8px;
    border-radius: 4px;
}
.orange-card-bg h2 {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 15px;
    color: #121212;
}
.orange-card-bg p {
    color: #222;
    font-size: 1.05rem;
    margin-bottom: 30px;
    max-width: 600px;
}
.btn-dark-solid {
    background: #121212;
    color: #fff;
    padding: 14px 24px;
    border-radius: 6px;
    text-decoration: none;
    font-weight: bold;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    margin-right: 10px;
    margin-bottom: 15px;
}
.btn-outline-white {
    background: transparent;
    border: 2px solid #121212;
    color: #121212;
    padding: 12px 22px;
    border-radius: 6px;
    text-decoration: none;
    font-weight: bold;
    display: inline-block;
    margin-bottom: 15px;
}
.contact-box-dark {
    background: #121212;
    border-radius: 8px;
    padding: 25px;
    margin-top: 40px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}
.contact-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid #222;
    padding-bottom: 15px;
}
.contact-row:last-child {
    border-bottom: none;
    padding-bottom: 0;
}
.contact-row .label {
    color: #777;
    font-size: 0.75rem;
    font-weight: 800;
    letter-spacing: 1px;
}
.contact-row .val {
    color: #fff;
    font-weight: bold;
}
.btn-copy {
    background: #222;
    color: #fff;
    border: none;
    padding: 6px 12px;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: bold;
    cursor: pointer;
}

/* Footer */
.site-footer {
    background: #0d0d0d;
    padding: 60px 0 30px 0;
    border-top: 1px solid #222;
    color: #888;
}
.footer-top-loc {
    color: #ff6b1a;
    font-weight: bold;
    margin-bottom: 30px;
}
.footer-columns {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}
.footer-col h4 {
    color: #fff;
    font-size: 1rem;
    margin-bottom: 20px;
}
.footer-col ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 10px;
}
.footer-col ul li a, .footer-bottom a {
    color: #888;
    text-decoration: none;
}
.footer-col ul li a:hover {
    color: #ff6b1a;
}
.footer-col p {
    margin-bottom: 8px;
    font-size: 0.95rem;
    color: #aaa;
}
.footer-bottom {
    border-top: 1px solid #1a1a1a;
    padding-top: 20px;
    display: flex;
    justify-content: space-between;
    font-size: 0.85rem;
}
.accreditation-text {
    color: #777;
}

/* Mobile Menu Styles */
.nav-menu {
    display: none;
    flex-direction: column;
    gap: 15px;
    background: #181818;
    padding: 20px;
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    border-bottom: 1px solid #262626;
    z-index: 999;
}

.site-header.nav-open .nav-menu {
    display: flex;
}

.nav-menu a {
    color: #fff;
    text-decoration: none;
    font-weight: bold;
    font-size: 1rem;
}

.nav-menu a:hover {
    color: #ff6b1a;
}

/* Form Success / Error Notice Styling */
.form-alert {
    padding: 14px 18px;
    border-radius: 4px;
    font-size: 0.95rem;
    font-weight: 700;
    margin-bottom: 20px;
}

.form-alert.success {
    background: rgba(40, 167, 69, 0.15);
    border: 1px solid #28a745;
    color: #28a745;
}

.form-alert.error {
    background: rgba(220, 53, 69, 0.15);
    border: 1px solid #dc3545;
    color: #dc3545;
}