/* =========================================
   VARIABLES & DESIGN TOKENS
   ========================================= */
:root {
    /* Color Palette */
    --clr-white: #ffffff;
    --clr-light: #f4f7f6;
    --clr-light-alt: #e0e5ec;
    --clr-dark: #0a2540;
    --clr-dark-alt: #1a365d;
    --clr-primary: #0052cc;
    --clr-primary-hover: #0043a8;
    --clr-accent: #00d2ff;
    
    /* Typography */
    --font-primary: 'Inter', sans-serif;
    --font-heading: 'Outfit', sans-serif;
    
    /* Shadows & Transitions */
    --shadow-sm: 0 2px 10px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 10px 30px rgba(0, 0, 0, 0.08);
    --shadow-hover: 0 15px 40px rgba(0, 82, 204, 0.15);
    --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

/* =========================================
   RESET & BASE STYLES
   ========================================= */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    background-color: var(--clr-white);
    color: var(--clr-dark);
    line-height: 1.6;
    overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.2;
    color: var(--clr-dark);
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
}

ul {
    list-style: none;
}

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

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
}

.section-padding {
    padding: 100px 0;
}

.bg-light {
    background-color: var(--clr-light);
}

/* =========================================
   TYPOGRAPHY & UTILITIES
   ========================================= */
.section-title {
    text-align: center;
    margin-bottom: 60px;
}

.section-title h2 {
    font-size: 2.5rem;
    margin-bottom: 15px;
    position: relative;
    display: inline-block;
}

.section-title h2::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background-color: var(--clr-primary);
    border-radius: 2px;
}

.section-title p {
    color: #555;
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto;
}

.btn-primary {
    display: inline-block;
    background-color: var(--clr-primary);
    color: var(--clr-white) !important;
    padding: 12px 30px;
    border-radius: 50px;
    font-weight: 600;
    border: none;
    cursor: pointer;
    text-align: center;
    box-shadow: 0 4px 15px rgba(0, 82, 204, 0.3);
}

.btn-primary:hover {
    background-color: var(--clr-primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 82, 204, 0.4);
}

.w-100 {
    width: 100%;
}

/* =========================================
   HEADER & NAVIGATION
   ========================================= */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    z-index: 1000;
    padding: 20px 0;
    transition: var(--transition);
    border-bottom: 1px solid rgba(0,0,0,0.05);
}

.header.scrolled {
    padding: 15px 0;
    box-shadow: var(--shadow-sm);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-family: var(--font-heading);
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--clr-dark);
}

.logo span {
    color: var(--clr-primary);
}

.nav-list {
    display: flex;
    align-items: center;
    gap: 30px;
}

.nav-link {
    font-weight: 600;
    font-size: 0.95rem;
}

.nav-link.active,
.nav-link:not(.btn-primary):hover {
    color: var(--clr-primary);
}

/* Internal Header Styles */
.header-internal {
    background-color: var(--clr-white);
    box-shadow: var(--shadow-sm);
}

/* Hamburger Menu */
.hamburger {
    display: none;
    cursor: pointer;
    z-index: 1001;
}

.bar {
    display: block;
    width: 25px;
    height: 3px;
    margin: 5px auto;
    transition: all 0.3s ease-in-out;
    background-color: var(--clr-dark);
    border-radius: 3px;
}

/* =========================================
   HERO SECTION
   ========================================= */
.hero {
    height: 100vh;
    min-height: 600px;
    background: linear-gradient(to right, rgba(10, 37, 64, 0.85), rgba(10, 37, 64, 0.4)), url('../images/hero_elevator.png') center/cover no-repeat;
    display: flex;
    align-items: center;
    position: relative;
    padding-top: 80px; /* Offset for header */
}

.hero-content {
    width: 90%;
    max-width: 800px;
    margin: 0 auto;
    color: var(--clr-white);
    text-align: center;
}

.hero-content h1 {
    font-size: clamp(2.5rem, 5vw, 4.5rem);
    color: var(--clr-white);
    margin-bottom: 20px;
    text-shadow: 0 2px 10px rgba(0,0,0,0.3);
}

.hero-content p {
    font-size: clamp(1.1rem, 2vw, 1.4rem);
    margin-bottom: 40px;
    opacity: 0.9;
    font-weight: 300;
}

.hero-btn {
    font-size: 1.1rem;
    padding: 15px 40px;
}

/* =========================================
   SERVICES SECTION
   ========================================= */
.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
}

.service-card {
    background-color: var(--clr-white);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    border: 1px solid var(--clr-light-alt);
}

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-hover);
    border-color: transparent;
}

.service-img {
    height: 240px;
    overflow: hidden;
}

.service-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.service-card:hover .service-img img {
    transform: scale(1.05);
}

.service-info {
    padding: 30px;
}

.service-info h3 {
    font-size: 1.5rem;
    margin-bottom: 15px;
    color: var(--clr-dark);
}

.service-info p {
    color: #555;
    font-size: 0.95rem;
}

/* =========================================
   PROJECTS GALLERY
   ========================================= */
.projects-gallery {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
}

.gallery-item {
    position: relative;
    border-radius: 12px;
    overflow: hidden;
    height: 300px;
}

.gallery-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.6s ease;
}

.gallery-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(10, 37, 64, 0.9) 0%, rgba(10, 37, 64, 0.2) 100%);
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    padding: 30px;
    opacity: 0;
    transition: var(--transition);
}

.gallery-item:hover img {
    transform: scale(1.1);
}

.gallery-item:hover .gallery-overlay {
    opacity: 1;
}

.gallery-overlay h4 {
    color: var(--clr-white);
    font-size: 1.4rem;
    margin-bottom: 5px;
    transform: translateY(20px);
    transition: transform 0.4s ease;
}

.gallery-overlay p {
    color: var(--clr-accent);
    font-weight: 600;
    transform: translateY(20px);
    transition: transform 0.4s ease 0.1s;
}

.gallery-item:hover .gallery-overlay h4,
.gallery-item:hover .gallery-overlay p {
    transform: translateY(0);
}

/* =========================================
   CONTACT SECTION
   ========================================= */
.contact-wrapper {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 60px;
    background-color: var(--clr-white);
    border-radius: 20px;
    box-shadow: var(--shadow-md);
    overflow: hidden;
}

.contact-info {
    background-color: var(--clr-dark);
    color: var(--clr-white);
    padding: 50px;
}

.contact-info h2 {
    color: var(--clr-white);
    font-size: 2.2rem;
    margin-bottom: 20px;
}

.contact-info p {
    opacity: 0.8;
    margin-bottom: 40px;
}

.info-list li {
    display: flex;
    align-items: center;
    margin-bottom: 25px;
}

.info-list .icon {
    font-style: normal;
    font-size: 1.5rem;
    margin-right: 20px;
    background: rgba(255,255,255,0.1);
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
}

.social-links {
    margin-top: 50px;
}

.social-icon {
    color: var(--clr-white);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    border-bottom: 2px solid transparent;
}

.social-icon:hover {
    border-color: var(--clr-accent);
    color: var(--clr-accent);
}

.contact-form-container {
    padding: 50px 50px 50px 0;
}

.form-group {
    margin-bottom: 25px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--clr-dark-alt);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 15px;
    border: 1px solid var(--clr-light-alt);
    border-radius: 8px;
    font-family: inherit;
    font-size: 1rem;
    background-color: #fafafa;
    transition: var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--clr-primary);
    background-color: var(--clr-white);
    box-shadow: 0 0 0 4px rgba(0, 82, 204, 0.1);
}

.form-status {
    margin-top: 20px;
    padding: 15px;
    border-radius: 8px;
    display: none;
    font-weight: 600;
    text-align: center;
}

.status-success {
    display: block;
    background-color: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.status-error {
    display: block;
    background-color: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

/* =========================================
   FOOTER
   ========================================= */
.footer {
    background-color: var(--clr-dark);
    color: var(--clr-white);
    padding: 60px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-logo-section p {
    margin-top: 15px;
    opacity: 0.7;
    max-width: 400px;
}

.footer-links-section h3 {
    color: var(--clr-white);
    margin-bottom: 20px;
    font-size: 1.2rem;
    text-decoration: underline;
    text-decoration-color: var(--clr-accent);
    text-decoration-thickness: 2px;
    text-underline-offset: 6px;
}

.footer-links {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
}

.footer-links a {
    color: var(--clr-white);
    transition: var(--transition);
    display: inline-block;
}

.footer-links a:hover {
    color: var(--clr-accent);
    transform: translateX(5px);
}

.footer-bottom {
    text-align: center;
    border-top: 1px solid rgba(255,255,255,0.1);
    padding-top: 30px;
}

.footer-bottom p {
    opacity: 0.6;
    font-size: 0.9rem;
}

/* =========================================
   ANIMATIONS
   ========================================= */
.fade-in-up, .slide-up, .fade-in {
    opacity: 0;
    visibility: hidden;
}

.fade-in-up.appear {
    animation: fadeInUp 0.8s ease forwards;
    visibility: visible;
}

.slide-up.appear {
    animation: slideUp 0.8s cubic-bezier(0.25, 0.8, 0.25, 1) forwards;
    visibility: visible;
}

.fade-in.appear {
    animation: fadeIn 1s ease forwards;
    visibility: visible;
}

.delay-1 { animation-delay: 0.2s; }
.delay-2 { animation-delay: 0.4s; }

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(50px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* =========================================
   INTERNAL PAGES STYLES
   ========================================= */
.page-header {
    background: linear-gradient(to right, rgba(10, 37, 64, 0.9), rgba(10, 37, 64, 0.7)), url('../images/hero_elevator.png') center/cover;
    padding: 160px 0 80px;
    text-align: center;
    color: var(--clr-white);
}

.page-header h1 {
    font-size: 3rem;
    color: var(--clr-white);
}

.about-grid, .detail-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
    align-items: center;
}

.detail-grid.reverse .detail-text {
    order: 2;
}

.detail-grid.reverse .detail-image {
    order: 1;
}

.about-text h2, .detail-text h2 {
    font-size: 2.2rem;
    margin-bottom: 20px;
    color: var(--clr-dark);
}

.values-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.value-item {
    background: var(--clr-light);
    padding: 30px;
    border-radius: 12px;
    text-align: center;
}

.value-item .icon {
    font-size: 2.5rem;
    margin-bottom: 15px;
}

.check-list {
    margin-top: 20px;
}

.check-list li {
    margin-bottom: 15px;
    padding-left: 30px;
    position: relative;
}

.check-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    top: 0;
    color: var(--clr-primary);
    font-weight: bold;
}

.text-center {
    text-align: center;
}

/* =========================================
   RESPONSIVE DESIGN (MEDIA QUERIES)
   ========================================= */
@media (max-width: 992px) {
    .contact-wrapper, .about-grid, .detail-grid {
        grid-template-columns: 1fr;
    }
    
    .detail-grid.reverse .detail-text, .detail-grid.reverse .detail-image {
        order: unset;
    }

    .values-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .footer-logo-section p {
        margin: 15px auto 0;
    }

    .contact-form-container {
        padding: 50px;
    }
}

@media (max-width: 768px) {
    .hamburger {
        display: block;
    }
    
    .hamburger.active .bar:nth-child(2) { opacity: 0; }
    .hamburger.active .bar:nth-child(1) { transform: translateY(8px) rotate(45deg); }
    .hamburger.active .bar:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }
    
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: var(--clr-white);
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: 0 10px 15px rgba(0,0,0,0.1);
        padding: 20px 0 40px;
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .nav-list {
        flex-direction: column;
        gap: 0;
    }
    
    .nav-list li {
        margin: 15px 0;
        width: 100%;
    }
    
    .nav-link.btn-primary {
        display: inline-block;
        margin-top: 10px;
    }
    
    .section-padding {
        padding: 70px 0;
    }
    
    .contact-info, .contact-form-container {
        padding: 30px;
    }
}