/* ============================================================
   Billboard Express — Mobile Billboard Advertising
   Lightweight, responsive CSS optimized for Core Web Vitals
   ============================================================ */

/* ---------- RESET & BASE ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
    --color-primary: #f59e0b;
    --color-primary-dark: #d97706;
    --color-primary-light: #fbbf24;
    --color-accent: #3b82f6;
    --color-dark: #0f172a;
    --color-dark-soft: #1e293b;
    --color-gray-900: #111827;
    --color-gray-800: #1f2937;
    --color-gray-700: #374151;
    --color-gray-600: #4b5563;
    --color-gray-400: #9ca3af;
    --color-gray-300: #d1d5db;
    --color-gray-200: #e5e7eb;
    --color-gray-100: #f3f4f6;
    --color-gray-50: #f9fafb;
    --color-white: #ffffff;
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --radius: 12px;
    --radius-sm: 8px;
    --radius-lg: 16px;
    --shadow: 0 1px 3px rgba(0,0,0,.1), 0 1px 2px rgba(0,0,0,.06);
    --shadow-md: 0 4px 6px rgba(0,0,0,.07), 0 2px 4px rgba(0,0,0,.06);
    --shadow-lg: 0 10px 25px rgba(0,0,0,.1), 0 6px 10px rgba(0,0,0,.08);
    --shadow-xl: 0 20px 50px rgba(0,0,0,.15);
    --transition: .25s cubic-bezier(.4,0,.2,1);
    --max-width: 1200px;
}

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
    font-family: var(--font-family);
    font-size: 16px;
    line-height: 1.7;
    color: var(--color-gray-700);
    background: var(--color-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
h1, h2, h3, h4 { color: var(--color-dark); line-height: 1.2; font-weight: 800; }
h1 { font-size: clamp(2.2rem, 5vw, 3.8rem); }
h2 { font-size: clamp(1.7rem, 3.5vw, 2.6rem); }
h3 { font-size: clamp(1.1rem, 2vw, 1.35rem); font-weight: 700; }
em { font-style: italic; }
strong { font-weight: 700; }

.container { width: 100%; max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }

/* ---------- BUTTONS ---------- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-family: var(--font-family);
    font-weight: 600;
    font-size: .95rem;
    padding: 12px 28px;
    border-radius: var(--radius-sm);
    border: 2px solid transparent;
    cursor: pointer;
    transition: all var(--transition);
    text-align: center;
    white-space: nowrap;
}
.btn-primary {
    background: var(--color-primary);
    color: var(--color-dark);
    border-color: var(--color-primary);
}
.btn-primary:hover {
    background: var(--color-primary-dark);
    border-color: var(--color-primary-dark);
    transform: translateY(-1px);
    box-shadow: 0 4px 14px rgba(245,158,11,.4);
}
.btn-outline {
    background: transparent;
    color: var(--color-white);
    border-color: rgba(255,255,255,.5);
}
.btn-outline:hover {
    background: rgba(255,255,255,.12);
    border-color: var(--color-white);
}
.btn-phone {
    background: transparent;
    color: var(--color-primary);
    border-color: transparent;
    padding: 10px 16px;
    font-weight: 700;
}
.btn-phone:hover { color: var(--color-primary-dark); }
.btn-lg { padding: 16px 36px; font-size: 1.05rem; }
.btn-full { width: 100%; justify-content: center; }

/* ---------- HEADER ---------- */
.site-header {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 1000;
    background: rgba(15,23,42,.85);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    transition: background var(--transition), box-shadow var(--transition);
}
.site-header.scrolled {
    background: rgba(15,23,42,.97);
    box-shadow: 0 2px 20px rgba(0,0,0,.3);
}
.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
    gap: 24px;
}
.logo {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-white);
    display: flex;
    align-items: center;
    gap: 2px;
    flex-shrink: 0;
}
.logo strong { color: var(--color-primary); }
.logo-icon { color: var(--color-primary); font-size: 1.1rem; margin-right: 4px; }
.main-nav {
    display: flex;
    align-items: center;
    gap: 28px;
}
.main-nav a {
    color: var(--color-gray-300);
    font-size: .875rem;
    font-weight: 500;
    transition: color var(--transition);
}
.main-nav a:hover { color: var(--color-primary); }
.header-cta {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-shrink: 0;
}
.mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}
.mobile-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-white);
    border-radius: 2px;
    transition: all var(--transition);
}
.mobile-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.mobile-toggle.active span:nth-child(2) { opacity: 0; }
.mobile-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* ---------- HERO ---------- */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    overflow: hidden;
    padding: 120px 0 80px;
}
.hero-bg {
    position: absolute;
    inset: 0;
    z-index: 0;
}
.hero-bg img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}
.hero-overlay {
    position: absolute;
    inset: 0;
    z-index: 1;
    background: linear-gradient(135deg, rgba(15,23,42,.92) 0%, rgba(15,23,42,.7) 50%, rgba(15,23,42,.5) 100%);
}
.hero-content {
    position: relative;
    z-index: 2;
    max-width: 780px;
}
.hero-eyebrow {
    display: inline-block;
    font-size: .85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--color-primary);
    margin-bottom: 16px;
    padding: 6px 16px;
    background: rgba(245,158,11,.12);
    border-radius: 30px;
    border: 1px solid rgba(245,158,11,.2);
}
.hero h1 {
    color: var(--color-white);
    margin-bottom: 20px;
}
.gradient-text {
    background: linear-gradient(135deg, var(--color-primary-light), var(--color-primary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.hero-sub {
    font-size: 1.15rem;
    color: var(--color-gray-300);
    line-height: 1.7;
    margin-bottom: 36px;
    max-width: 600px;
}
.hero-stats {
    display: flex;
    gap: 40px;
    margin-bottom: 40px;
}
.stat { display: flex; flex-direction: column; }
.stat-number {
    font-size: 2.2rem;
    font-weight: 900;
    color: var(--color-primary);
    line-height: 1;
}
.stat-label {
    font-size: .82rem;
    color: var(--color-gray-400);
    font-weight: 500;
    margin-top: 4px;
    text-transform: uppercase;
    letter-spacing: 1px;
}
.hero-actions {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

/* ---------- TRUST BAR ---------- */
.trust-bar {
    background: var(--color-dark);
    border-bottom: 1px solid rgba(255,255,255,.06);
    padding: 20px 0;
}
.trust-bar-inner {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 32px;
}
.trust-item {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--color-gray-300);
    font-size: .9rem;
    font-weight: 500;
}
.trust-item svg { color: var(--color-primary); flex-shrink: 0; }

/* ---------- SECTION COMMON ---------- */
.section-header { text-align: center; max-width: 720px; margin: 0 auto 56px; }
.section-eyebrow {
    display: inline-block;
    font-size: .8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--color-primary-dark);
    margin-bottom: 12px;
}
.section-desc {
    font-size: 1.05rem;
    color: var(--color-gray-600);
    margin-top: 16px;
    line-height: 1.7;
}

/* ---------- SERVICES ---------- */
.services {
    padding: 100px 0;
    background: var(--color-gray-50);
}
.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}
.service-card {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: transform var(--transition), box-shadow var(--transition);
}
.service-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}
.service-img {
    position: relative;
    overflow: hidden;
    aspect-ratio: 16/10;
}
.service-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform .5s ease;
}
.service-card:hover .service-img img { transform: scale(1.05); }
.service-body { padding: 28px; }
.service-body h3 { margin-bottom: 12px; }
.service-body p { font-size: .95rem; color: var(--color-gray-600); }

/* ---------- WHY US ---------- */
.why-us {
    padding: 100px 0;
    background: var(--color-white);
}
.why-us-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}
.why-us-image {
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-xl);
}
.why-us-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}
.why-us-content .section-eyebrow { margin-bottom: 12px; }
.why-us-content h2 { margin-bottom: 20px; }
.why-us-content > p { color: var(--color-gray-600); margin-bottom: 16px; font-size: .98rem; }
.why-features { margin-top: 32px; display: flex; flex-direction: column; gap: 20px; }
.why-feature {
    display: flex;
    align-items: flex-start;
    gap: 14px;
}
.why-icon {
    flex-shrink: 0;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: rgba(245,158,11,.12);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-primary-dark);
    margin-top: 2px;
}
.why-feature strong { display: block; color: var(--color-dark); font-size: .95rem; margin-bottom: 2px; }
.why-feature p { font-size: .88rem; color: var(--color-gray-600); margin: 0; line-height: 1.5; }

/* ---------- WHO BENEFITS ---------- */
.who-benefits {
    padding: 100px 0;
    background: var(--color-gray-50);
}
.benefits-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}
.benefit-card {
    background: var(--color-white);
    border-radius: var(--radius);
    padding: 36px 28px;
    box-shadow: var(--shadow);
    transition: transform var(--transition), box-shadow var(--transition);
    border: 1px solid var(--color-gray-200);
}
.benefit-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
    border-color: var(--color-primary-light);
}
.benefit-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-sm);
    background: linear-gradient(135deg, rgba(245,158,11,.12), rgba(245,158,11,.06));
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-primary-dark);
    margin-bottom: 20px;
}
.benefit-card h3 { margin-bottom: 10px; }
.benefit-card p { font-size: .92rem; color: var(--color-gray-600); }

/* ---------- GALLERY ---------- */
.gallery {
    padding: 100px 0;
    background: var(--color-dark);
}
.gallery .section-header { color: var(--color-white); }
.gallery .section-eyebrow { color: var(--color-primary); }
.gallery h2 { color: var(--color-white); }
.gallery .section-desc { color: var(--color-gray-400); }
.gallery-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}
.gallery-item {
    border-radius: var(--radius-sm);
    overflow: hidden;
    aspect-ratio: 16/10;
    position: relative;
}
.gallery-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform .5s ease;
}
.gallery-item:hover img { transform: scale(1.06); }

/* ---------- HOW IT WORKS ---------- */
.how-it-works {
    padding: 100px 0;
    background: var(--color-white);
}
.steps-grid {
    display: flex;
    align-items: flex-start;
    justify-content: center;
    gap: 24px;
}
.step {
    flex: 1;
    max-width: 320px;
    text-align: center;
    padding: 32px 24px;
}
.step-number {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: var(--color-primary);
    color: var(--color-dark);
    font-size: 1.4rem;
    font-weight: 900;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
}
.step h3 { margin-bottom: 12px; }
.step p { font-size: .92rem; color: var(--color-gray-600); }
.step-arrow {
    display: flex;
    align-items: center;
    color: var(--color-gray-300);
    padding-top: 48px;
    flex-shrink: 0;
}

/* ---------- SOCIAL PROOF ---------- */
.social-proof {
    position: relative;
    padding: 100px 0;
    text-align: center;
    overflow: hidden;
}
.social-proof-bg {
    position: absolute;
    inset: 0;
}
.social-proof-bg img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}
.social-proof-overlay {
    position: absolute;
    inset: 0;
    background: rgba(15,23,42,.88);
}
.social-proof-content {
    position: relative;
    z-index: 2;
}
.social-proof h2 {
    color: var(--color-white);
    margin-bottom: 48px;
}
.proof-stats {
    display: flex;
    justify-content: center;
    gap: 64px;
    margin-bottom: 48px;
    flex-wrap: wrap;
}
.proof-stat { display: flex; flex-direction: column; }
.proof-number {
    font-size: 3rem;
    font-weight: 900;
    color: var(--color-primary);
    line-height: 1;
}
.proof-label {
    font-size: .85rem;
    color: var(--color-gray-400);
    font-weight: 500;
    margin-top: 8px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* ---------- FAQ ---------- */
.faq {
    padding: 100px 0;
    background: var(--color-gray-50);
}
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
    background: var(--color-white);
    border-radius: var(--radius-sm);
    margin-bottom: 12px;
    border: 1px solid var(--color-gray-200);
    overflow: hidden;
    transition: border-color var(--transition);
}
.faq-item[open] { border-color: var(--color-primary-light); }
.faq-item summary {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 24px;
    cursor: pointer;
    font-weight: 600;
    color: var(--color-dark);
    font-size: .98rem;
    list-style: none;
    gap: 16px;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary svg {
    flex-shrink: 0;
    color: var(--color-gray-400);
    transition: transform var(--transition);
}
.faq-item[open] summary svg { transform: rotate(180deg); color: var(--color-primary); }
.faq-answer {
    padding: 0 24px 20px;
    color: var(--color-gray-600);
    font-size: .95rem;
    line-height: 1.7;
}
.faq-answer a { color: var(--color-primary-dark); font-weight: 600; }
.faq-answer a:hover { text-decoration: underline; }

/* ---------- CONTACT ---------- */
.contact {
    padding: 100px 0;
    background: var(--color-white);
}
.contact-layout {
    display: grid;
    grid-template-columns: 1fr 1.1fr;
    gap: 60px;
    align-items: start;
}
.contact-info .section-eyebrow { margin-bottom: 12px; }
.contact-info h2 { margin-bottom: 16px; }
.contact-info > p { color: var(--color-gray-600); font-size: .98rem; margin-bottom: 28px; }
.contact-details { display: flex; flex-direction: column; gap: 16px; margin-bottom: 32px; }
.contact-detail {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--color-dark);
    transition: color var(--transition);
}
.contact-detail svg { color: var(--color-primary); flex-shrink: 0; }
.contact-detail:hover { color: var(--color-primary-dark); }
.contact-image {
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow-md);
}
.contact-form-wrap {
    background: var(--color-gray-50);
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-lg);
    padding: 40px;
}
.contact-form h3 {
    font-size: 1.3rem;
    margin-bottom: 28px;
    color: var(--color-dark);
}
.form-group { margin-bottom: 18px; }
.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}
.form-group label {
    display: block;
    font-size: .85rem;
    font-weight: 600;
    color: var(--color-dark);
    margin-bottom: 6px;
}
.required { color: var(--color-primary-dark); }
.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--color-gray-300);
    border-radius: var(--radius-sm);
    font-family: var(--font-family);
    font-size: .95rem;
    color: var(--color-dark);
    background: var(--color-white);
    transition: border-color var(--transition), box-shadow var(--transition);
    -webkit-appearance: none;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(245,158,11,.15);
}
.form-group textarea { resize: vertical; min-height: 100px; }
.form-group select { cursor: pointer; }
.contact-form .btn { margin-top: 8px; }
.form-disclaimer {
    font-size: .8rem;
    color: var(--color-gray-400);
    margin-top: 14px;
    text-align: center;
}

/* ---------- FOOTER ---------- */
.site-footer {
    background: var(--color-dark);
    color: var(--color-gray-400);
    padding: 64px 0 0;
}
.footer-top {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1fr;
    gap: 40px;
    padding-bottom: 48px;
    border-bottom: 1px solid rgba(255,255,255,.08);
}
.footer-brand .logo { margin-bottom: 16px; }
.footer-brand p { font-size: .88rem; line-height: 1.7; color: var(--color-gray-400); }
.footer-links h4, .footer-contact h4 {
    color: var(--color-white);
    font-size: .85rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 16px;
}
.footer-links a, .footer-contact a {
    display: block;
    font-size: .88rem;
    color: var(--color-gray-400);
    padding: 4px 0;
    transition: color var(--transition);
}
.footer-links a:hover, .footer-contact a:hover { color: var(--color-primary); }
.footer-service-area { font-size: .85rem; margin-top: 12px; }
.footer-bottom {
    padding: 24px 0;
    text-align: center;
    font-size: .82rem;
    color: var(--color-gray-600);
}

/* ---------- RESPONSIVE ---------- */
@media (max-width: 1024px) {
    .services-grid { grid-template-columns: repeat(2, 1fr); }
    .services-grid .service-card:last-child { grid-column: span 2; }
    .why-us-layout { grid-template-columns: 1fr; gap: 40px; }
    .benefits-grid { grid-template-columns: repeat(2, 1fr); }
    .gallery-grid { grid-template-columns: repeat(2, 1fr); }
    .contact-layout { grid-template-columns: 1fr; }
    .footer-top { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
    .main-nav {
        position: fixed;
        top: 72px; left: 0; right: 0;
        background: rgba(15,23,42,.98);
        backdrop-filter: blur(16px);
        flex-direction: column;
        padding: 24px;
        gap: 16px;
        transform: translateY(-120%);
        opacity: 0;
        transition: transform .35s ease, opacity .3s ease;
        pointer-events: none;
    }
    .main-nav.open {
        transform: translateY(0);
        opacity: 1;
        pointer-events: all;
    }
    .main-nav a { font-size: 1rem; padding: 8px 0; }
    .mobile-toggle { display: flex; }
    .header-cta .btn-phone span { display: none; }
    .header-cta .btn-primary { display: none; }

    .hero { min-height: auto; padding: 140px 0 80px; }
    .hero-stats { gap: 24px; }
    .stat-number { font-size: 1.6rem; }
    .hero-actions { flex-direction: column; }
    .hero-actions .btn { width: 100%; justify-content: center; }

    .trust-bar-inner { gap: 20px; }
    .trust-item { font-size: .82rem; }

    .services, .why-us, .who-benefits, .gallery, .how-it-works, .social-proof, .faq, .contact {
        padding: 72px 0;
    }
    .section-header { margin-bottom: 40px; }
    .services-grid { grid-template-columns: 1fr; }
    .services-grid .service-card:last-child { grid-column: span 1; }
    .benefits-grid { grid-template-columns: 1fr; }
    .gallery-grid { grid-template-columns: 1fr; }

    .steps-grid { flex-direction: column; align-items: center; }
    .step-arrow { display: none; }

    .proof-stats { gap: 32px; }
    .proof-number { font-size: 2.2rem; }

    .contact-form-wrap { padding: 28px 20px; }
    .form-row { grid-template-columns: 1fr; }

    .footer-top { grid-template-columns: 1fr; gap: 32px; }
}

@media (max-width: 480px) {
    .hero { padding: 120px 0 60px; }
    .hero-stats { flex-wrap: wrap; gap: 16px; }
    .trust-bar-inner { flex-direction: column; align-items: center; gap: 14px; }
    .proof-stats { flex-direction: column; gap: 24px; align-items: center; }
}

/* ---------- PRINT ---------- */
@media print {
    .site-header, .mobile-toggle, .hero-overlay, .hero-bg, .social-proof-bg, .social-proof-overlay { display: none; }
    body { color: #000; font-size: 12pt; }
    .hero { min-height: auto; padding: 20px 0; background: #fff; }
    .hero-content * { color: #000 !important; -webkit-text-fill-color: #000 !important; }
}