:root {
    --primary: #1a5276;
    --secondary: #e67e22;
    --light: #ecf0f1;
    --dark: #2c3e50;
    --success: #27ae60;
    --shadow: 0 8px 20px rgba(0,0,0,0.08);
    --radius: 12px;
}

* { 
    margin: 0; 
    padding: 0; 
    box-sizing: border-box; 
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; 
}

body { 
    line-height: 1.6; 
    color: #333; 
    background-color: #f9f9f9; 
    overflow-x: hidden; 
}

.container { 
    width: 92%; 
    max-width: 1200px; 
    margin: 0 auto; 
}

img { 
    max-width: 100%; 
    height: auto; 
    display: block; 
}

/* HEADER */
header {
    background: rgba(255,255,255,0.96);
    backdrop-filter: blur(4px);
    box-shadow: 0 2px 15px rgba(0,0,0,0.06);
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: all 0.3s ease;
}

header.scrolled { 
    background: rgba(255,255,255,0.98); 
    box-shadow: 0 4px 20px rgba(0,0,0,0.08); 
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.8rem 0;
    flex-wrap: wrap;
}

.logo {
    font-size: 1.7rem;
    font-weight: 700;
    color: var(--primary);
    display: flex;
    align-items: center;
    gap: 8px;
}

.logo span { color: var(--secondary); }
.logo i { font-size: 1.9rem; color: var(--secondary); }

.header-right {
    display: flex;
    align-items: center;
    gap: 1.2rem;
    margin-left: auto;
}

.sign-in-link {
    background: var(--secondary);
    color: #fff !important;
    padding: 0.4rem 1.2rem;
    border-radius: 50px;
    font-weight: 600;
    font-size: 0.9rem;
    text-decoration: none;
    transition: background 0.3s;
    white-space: nowrap;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.sign-in-link:hover { 
    background: #d35400; 
    color: #fff !important; 
}

nav ul {
    display: flex;
    list-style: none;
    align-items: center;
    gap: 0.2rem;
}

nav ul li a {
    text-decoration: none;
    color: var(--dark);
    font-weight: 500;
    padding: 0.5rem 0.9rem;
    border-radius: 30px;
    transition: all 0.2s;
    font-size: 0.95rem;
}

nav ul li a:hover { 
    color: var(--secondary); 
    background: rgba(230,126,34,0.06); 
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    font-size: 1.6rem;
    cursor: pointer;
    color: var(--primary);
    padding: 0 6px;
}

/* HERO */
.hero {
    position: relative;
    min-height: 92vh;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    text-align: center;
    overflow: hidden;
    padding: 2rem 0;
}

.hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(145deg, rgba(26,82,118,0.88) 0%, rgba(230,126,34,0.82) 100%);
    z-index: 1;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background: url('../images/hero-building.jpeg') center/cover no-repeat;
    z-index: 0;
    animation: zoomEffect 25s infinite alternate ease-in-out;
}

@keyframes zoomEffect { 
    0%{transform:scale(1);} 
    100%{transform:scale(1.08);} 
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 880px;
    padding: 0 20px;
    animation: fadeUp 1s ease-out;
}

@keyframes fadeUp { 
    from{opacity:0;transform:translateY(40px);} 
    to{opacity:1;transform:translateY(0);} 
}

.hero h1 { 
    font-size: 3.8rem; 
    font-weight: 800; 
    margin-bottom: 1.2rem; 
    line-height: 1.15; 
    text-shadow: 0 4px 20px rgba(0,0,0,0.25); 
}

.hero p { 
    font-size: 1.4rem; 
    margin-bottom: 2.2rem; 
    opacity: 0.95; 
    text-shadow: 0 2px 10px rgba(0,0,0,0.2); 
}

.hero-buttons { 
    display: flex; 
    justify-content: center; 
    gap: 18px; 
    flex-wrap: wrap; 
}

.btn {
    display: inline-block;
    background: var(--secondary);
    color: #fff;
    padding: 0.9rem 2.4rem;
    border: none;
    border-radius: 50px;
    font-weight: 700;
    text-decoration: none;
    transition: all 0.3s;
    box-shadow: 0 6px 20px rgba(230,126,34,0.4);
    font-size: 1rem;
}

.btn:hover { 
    background: #d35400; 
    transform: translateY(-3px); 
    box-shadow: 0 10px 28px rgba(230,126,34,0.5); 
}

.btn-transparent {
    background: transparent;
    border: 2px solid #fff;
    box-shadow: none;
}

.btn-transparent:hover { 
    background: #fff; 
    color: var(--primary); 
    box-shadow: 0 6px 20px rgba(255,255,255,0.3); 
}

.scroll-indicator {
    position: absolute;
    bottom: 28px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 2;
    animation: bounce 2.5s infinite;
    font-size: 2rem;
    opacity: 0.7;
}

@keyframes bounce { 
    0%,100%{transform:translateY(0) translateX(-50%);} 
    50%{transform:translateY(-16px) translateX(-50%);} 
}

/* SECTION TITLE */
.section-title {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary);
    margin: 2.8rem 0 1.2rem;
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 70px;
    height: 4px;
    background: var(--secondary);
    margin: 0.5rem auto;
    border-radius: 4px;
}

/* SERVICES GRID */
.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin: 2rem 0 3rem;
}

.service-card {
    background: #fff;
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: transform 0.3s, box-shadow 0.3s;
}

.service-card:hover { 
    transform: translateY(-6px); 
    box-shadow: 0 16px 40px rgba(0,0,0,0.08); 
}

.service-img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    background: #eef2f5;
}

.service-icon {
    background: var(--primary);
    color: #fff;
    font-size: 1.8rem;
    padding: 1rem;
    text-align: center;
    border-bottom: 3px solid var(--secondary);
}

.service-content { padding: 1.5rem; }
.service-content h3 { 
    color: var(--primary); 
    margin-bottom: 0.6rem; 
    font-size: 1.4rem; 
}

.service-content ul { 
    list-style: none; 
    margin: 0.8rem 0; 
}

.service-content ul li { 
    margin-bottom: 0.4rem; 
    padding-left: 1.5rem; 
    position: relative; 
}

.service-content ul li::before { 
    content: '•'; 
    color: var(--secondary); 
    position: absolute; 
    left: 0; 
    font-weight: 700; 
}

.keywords { 
    margin-top: 0.8rem; 
    font-size: 0.85rem; 
    color: #777; 
    font-style: italic; 
}

/* WHY US */
.why-us { 
    background: var(--light); 
    padding: 3.5rem 0; 
}

.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin: 2rem 0;
}

.feature {
    background: #fff;
    padding: 2rem 1.2rem;
    border-radius: var(--radius);
    text-align: center;
    box-shadow: var(--shadow);
    transition: transform 0.2s;
}

.feature:hover { transform: scale(1.02); }
.feature i { 
    font-size: 2.6rem; 
    color: var(--secondary); 
    margin-bottom: 1rem; 
}

/* CONTACT */
.contact { padding: 3rem 0; }

.contact-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2.5rem;
    margin-top: 1.5rem;
}

.contact-info {
    background: var(--primary);
    color: #fff;
    padding: 2rem;
    border-radius: var(--radius);
}

.contact-info h3 { 
    margin-bottom: 1.5rem; 
    border-bottom: 3px solid var(--secondary); 
    padding-bottom: 0.4rem; 
    display: inline-block; 
}

.contact-detail { 
    display: flex; 
    gap: 1rem; 
    margin-bottom: 1.2rem; 
    align-items: flex-start; 
}

.contact-detail i { 
    color: var(--secondary); 
    font-size: 1.3rem; 
    margin-top: 0.2rem; 
    width: 1.6rem; 
}

.contact-detail h4 { 
    font-weight: 600; 
    margin-bottom: 0.1rem; 
}

form input, form select, form textarea {
    width: 100%;
    padding: 0.8rem 1rem;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 1rem;
    transition: border 0.2s;
    background: #fff;
}

form input:focus, form select:focus, form textarea:focus { 
    border-color: var(--secondary); 
    outline: none; 
    box-shadow: 0 0 0 3px rgba(230,126,34,0.15); 
}

form label { 
    font-weight: 600; 
    margin-bottom: 0.3rem; 
    display: block; 
}

/* LEGAL */
.legal-section { 
    padding: 3rem 0; 
    background: #f5f7fa; 
}

.legal-content { 
    background: #fff; 
    padding: 2rem; 
    border-radius: var(--radius); 
    box-shadow: var(--shadow); 
}

.legal-content h3 { 
    color: var(--primary); 
    margin: 1.2rem 0 0.4rem; 
    border-bottom: 2px solid var(--secondary); 
    padding-bottom: 0.3rem; 
}

/* FOOTER */
footer {
    background: var(--dark);
    color: #eee;
    padding: 3rem 0 1.5rem;
}

.footer-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h3 { 
    color: #fff; 
    margin-bottom: 1.2rem; 
    position: relative; 
    padding-bottom: 0.4rem; 
}

.footer-section h3::after { 
    content: ''; 
    position: absolute; 
    bottom: 0; 
    left: 0; 
    width: 40px; 
    height: 2px; 
    background: var(--secondary); 
}

.footer-section ul { list-style: none; }
.footer-section ul li { margin-bottom: 0.5rem; }
.footer-section a { 
    color: #ccc; 
    text-decoration: none; 
    transition: color 0.2s; 
}

.footer-section a:hover { color: var(--secondary); }

.footer-bottom { 
    text-align: center; 
    padding-top: 1.5rem; 
    border-top: 1px solid rgba(255,255,255,0.08); 
    font-size: 0.95rem; 
}

/* MOBILE */
.mobile-sign-in { display: none; }

@media (max-width: 992px) {
    .hero h1 { font-size: 2.8rem; }
    .hero p { font-size: 1.2rem; }
}

@media (max-width: 768px) {
    .mobile-menu-btn { display: block; }
    .header-right .sign-in-link { display: none; }
    
    nav {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: #fff;
        padding: 0.8rem 1.2rem;
        box-shadow: 0 12px 30px rgba(0,0,0,0.08);
        display: none;
        border-top: 1px solid #eee;
    }
    
    nav.active { display: block; }
    nav ul { 
        flex-direction: column; 
        align-items: stretch; 
        gap: 0.2rem; 
    }
    nav ul li a { 
        display: block; 
        padding: 0.7rem 0.8rem; 
    }
    
    .mobile-sign-in {
        display: block;
        margin-top: 0.6rem;
        padding-top: 0.6rem;
        border-top: 1px solid #eee;
    }
    
    .mobile-sign-in a {
        display: block;
        text-align: center;
        background: var(--secondary);
        color: #fff !important;
        padding: 0.6rem;
        border-radius: 50px;
        font-weight: 600;
        text-decoration: none;
    }
    
    .hero h1 { font-size: 2.2rem; }
    .hero p { font-size: 1rem; }
    .hero-buttons { 
        flex-direction: column; 
        align-items: center; 
        gap: 12px; 
    }
    .btn { width: 80%; text-align: center; }
    .section-title { font-size: 2rem; }
}

@media (max-width: 480px) {
    .hero h1 { font-size: 1.8rem; }
    .btn { width: 100%; }
    .logo { font-size: 1.3rem; }
    .container { width: 95%; }
    .service-img { height: 160px; }
}