/* --- CSS VARIABLES (Stratus Brand Guidelines) --- */
:root {
    --primary-navy: #0A1C35; /* Authoritative text/backgrounds */
    --accent-cyan: #00D2FF;  /* Electric cyan accent */
    --text-dark: #1A2B44;
    --text-light: #64748B;
    --bg-white: #FFFFFF;
    --bg-gray: #F8FAFC;
    --transition: all 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
}

/* --- RESET & TYPOGRAPHY --- */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', sans-serif;
    color: var(--text-dark);
    background-color: var(--bg-white);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, .logo {
    font-family: 'Montserrat', sans-serif;
    color: var(--primary-navy);
    font-weight: 700;
}

p {
    color: var(--text-light);
    margin-bottom: 1rem;
}

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

a:hover {
    color: var(--accent-cyan);
}

/* Accessibility: Hide visually but keep for screen readers */
.sr-only-visually {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* --- LAYOUT & COMPONENTS --- */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.btn {
    display: inline-block;
    padding: 0.8rem 2.5rem;
    background-color: var(--primary-navy);
    color: var(--bg-white);
    font-family: 'Montserrat', sans-serif;
    font-weight: 600;
    border: 2px solid var(--primary-navy);
    border-radius: 4px;
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
}

.btn:hover {
    background-color: transparent;
    color: var(--primary-navy);
    border-color: var(--primary-navy);
}

.btn-outline {
    background-color: transparent;
    border: 2px solid var(--primary-navy);
    color: var(--primary-navy);
}

.btn-outline:hover {
    background-color: var(--primary-navy);
    color: var(--bg-white);
}

/* --- NAVIGATION --- */
body > header {
    position: fixed;
    top: 0;
    width: 100%;
    background-color: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    z-index: 1000;
    padding: 1.2rem 0;
    transition: var(--transition);
}

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

.logo {
    font-size: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    letter-spacing: -0.5px;
}

/* Logo Placeholder (Remove when image is added) */
.logo-arc {
    width: 20px;
    height: 20px;
    border-top: 4px solid var(--accent-cyan);
    border-left: 4px solid var(--accent-cyan);
    border-top-left-radius: 20px;
}

.nav-links {
    list-style: none;
    display: flex;
    gap: 2.5rem;
}

.nav-links a {
    font-weight: 600;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* --- HERO SLIDER --- */
.hero-slider {
    position: relative;
    height: 100vh;
    min-height: 600px;
    overflow: hidden;
    background-color: var(--bg-gray);
}

.slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    transition: opacity 1.5s ease-in-out;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    z-index: 1;
}

/* Minimalist backgrounds for slides - you can replace URLs with actual images */
.slide:nth-child(1) { background-color: #F8FAFC; background-image: linear-gradient(135deg, #F8FAFC 0%, #E2E8F0 100%); }
.slide:nth-child(2) { background-color: #F1F5F9; background-image: linear-gradient(135deg, #F1F5F9 0%, #CBD5E1 100%); }
.slide:nth-child(3) { background-color: #E2E8F0; background-image: linear-gradient(135deg, #E2E8F0 0%, #F8FAFC 100%); }

.slide.active {
    opacity: 1;
    z-index: 2;
}

.hero-overlay {
    position: absolute;
    top: 50%;
    left: 0;
    width: 100%;
    transform: translateY(-50%);
    z-index: 10;
    padding: 0 2rem;
    max-width: 1200px;
    margin: 0 auto;
    right: 0; /* Center container logic */
}

.hero-tagline {
    color: var(--accent-cyan);
    font-family: 'Montserrat', sans-serif;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 1rem;
    display: block;
    font-size: 0.9rem;
}

#hero-title {
    font-size: 4.5rem;
    line-height: 1.1;
    margin-bottom: 1rem;
    letter-spacing: -1.5px;
}

#hero-desc {
    font-size: 1.25rem;
    max-width: 600px;
    margin-bottom: 2.5rem;
    color: var(--text-dark);
}

.hero-buttons {
    display: flex;
    gap: 1rem;
}

/* --- SERVICES SECTION --- */
#services {
    padding: 8rem 0;
    background-color: var(--bg-white);
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.section-header h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    letter-spacing: -1px;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 2rem;
}

.card {
    background: var(--bg-white);
    padding: 3rem 2rem;
    border-radius: 8px;
    box-shadow: 0 10px 30px rgba(10, 28, 53, 0.05);
    border-bottom: 4px solid transparent;
    transition: var(--transition);
    height: 100%;
}

.card:hover {
    transform: translateY(-10px);
    border-bottom: 4px solid var(--accent-cyan);
    box-shadow: 0 20px 40px rgba(10, 28, 53, 0.08);
}

.card-icon {
    font-size: 2.5rem;
    color: var(--accent-cyan);
    margin-bottom: 1.5rem;
    font-family: 'Montserrat', sans-serif;
    font-weight: 700;
    opacity: 0.8;
}

.card h3 {
    font-size: 1.3rem;
    margin-bottom: 1rem;
}

/* --- ABOUT SECTION --- */
#about {
    padding: 8rem 0;
    background-color: var(--primary-navy);
    color: var(--bg-white);
}

#about h2, #about h3 {
    color: var(--bg-white);
}

#about p {
    color: #94A3B8; 
    font-size: 1.1rem;
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.about-text {
    padding-right: 2rem;
}

.about-text h2 {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
    letter-spacing: -1px;
}

.about-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem 2rem;
    border-left: 1px solid rgba(255,255,255,0.1);
    padding-left: 4rem;
}

.stat h3 {
    font-size: 3rem;
    color: var(--accent-cyan);
    margin-bottom: 0.2rem;
    line-height: 1;
}

.stat p {
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--bg-white);
    font-weight: 600;
    margin: 0;
}

/* --- CONTACT SECTION --- */
#contact {
    padding: 8rem 0;
    background-color: var(--bg-gray);
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 5rem;
}

.contact-text h2 {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
    letter-spacing: -1px;
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    background: var(--bg-white);
    padding: 3rem;
    border-radius: 8px;
    box-shadow: 0 10px 30px rgba(10, 28, 53, 0.05);
}

.form-group input, .form-group textarea, .form-group select {
    width: 100%;
    padding: 1.2rem;
    border: 1px solid #E2E8F0;
    border-radius: 4px;
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-gray);
    transition: var(--transition);
    color: var(--text-dark);
    font-size: 1rem;
}

.form-group input:focus, .form-group textarea:focus, .form-group select:focus {
    outline: none;
    border-color: var(--accent-cyan);
    background-color: var(--bg-white);
    box-shadow: 0 0 0 3px rgba(0, 210, 255, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 150px;
}

.contact-form .btn {
    width: 100%;
    margin-top: 1rem;
}

/* --- FOOTER --- */
footer {
    background-color: var(--primary-navy);
    color: var(--bg-white);
    padding: 4rem 0 2rem;
    text-align: center;
}

footer .logo {
    color: var(--bg-white);
}

footer p {
    color: #64748B;
    font-size: 0.9rem;
    margin: 0;
    margin-top: 2rem;
}

/* --- RESPONSIVE DESIGN & MOBILE MENU --- */

/* Mobile Menu Button (Hidden on Desktop) */
.mobile-menu-toggle {
    display: none;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    z-index: 1001; /* Stays above the sliding menu */
}

.hamburger {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--primary-navy);
    position: relative;
    transition: var(--transition);
}

.hamburger::before, .hamburger::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 2px;
    background-color: var(--primary-navy);
    left: 0;
    transition: var(--transition);
}

.hamburger::before { top: -8px; }
.hamburger::after { top: 8px; }

/* Hamburger Animation */
.mobile-menu-toggle.active .hamburger { background-color: transparent; }
.mobile-menu-toggle.active .hamburger::before { top: 0; transform: rotate(45deg); }
.mobile-menu-toggle.active .hamburger::after { top: 0; transform: rotate(-45deg); }

/* Tablet Breakpoint */
@media (max-width: 992px) {
    #hero-title { font-size: 3.5rem; }
    .about-grid, .contact-grid { grid-template-columns: 1fr; gap: 3rem; }
    .about-text { padding-right: 0; }
    .about-stats { border-left: none; padding-left: 0; border-top: 1px solid rgba(255,255,255,0.1); padding-top: 3rem; }
}

/* Mobile Breakpoint */
@media (max-width: 768px) {
    .mobile-menu-toggle { display: block; }
    
    .nav-links {
        position: fixed;
        top: 0;
        right: -100%; /* Hidden off-screen */
        height: 100vh;
        width: 80%;
        max-width: 300px;
        background-color: var(--bg-white);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        box-shadow: -10px 0 30px rgba(10, 28, 53, 0.1);
        transition: right 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
        z-index: 1000;
        gap: 2rem;
    }

    .nav-links.active { right: 0; } /* Slides in */

    #hero-title { font-size: 2.8rem; }
    #hero-desc { font-size: 1.1rem; }
    .hero-buttons { flex-direction: column; width: 100%; }
    .hero-buttons .btn { width: 100%; }
    section { padding: 5rem 0; }
    .contact-form { padding: 2rem; }
}