/* 
   OPACUS MEDIA - Shared Stylesheet
   Design System: Minimalist, Premium, Dark
*/

:root {
    /* Colors */
    --bg-color: #0D0D0D;
    --text-primary: #FFFFFF;
    --accent-color: #FC7A1E;
    --nav-border: rgba(252, 122, 30, 0.3); /* Subtle accent border */
    --footer-border: rgba(255, 255, 255, 0.1);

    /* Typography Weights */
    --weight-thin: 100;
    --weight-extra-light: 200;
    --weight-light: 300;
    --weight-regular: 400;
    --weight-medium: 500;
    --weight-semi-bold: 600;
    --weight-bold: 700;
    --weight-extra-bold: 800;
    --weight-black: 900;

    /* Transitions */
    --transition-smooth: 0.3s ease;
}

/* Base Resets */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: 'Inter', sans-serif;
    text-transform: uppercase; /* Global Uppercase Requirement */
    line-height: 1.6;
    overflow-x: hidden;
}

/* Typography Scale */
h1, h2, h3, h4, h5, h6 {
    font-weight: var(--weight-bold);
    letter-spacing: 0.05em;
}

h2 {
    color: var(--accent-color); /* Subheadings in accent color */
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

p {
    font-weight: var(--weight-regular);
    font-size: 0.9rem;
    letter-spacing: 0.02em;
}

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

/* Sticky Navigation */
header {
    position: sticky;
    top: 0;
    width: 100%;
    background-color: var(--bg-color);
    border-bottom: 1px solid var(--nav-border);
    z-index: 1000;
    padding: 1rem 5%;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1400px;
    margin: 0 auto;
}

.logo-container img {
    height: 40px; /* Adjust based on actual logo.png dimensions */
    display: block;
}

.nav-links {
    display: flex;
    gap: 2.5rem;
}

.nav-links a {
    font-weight: var(--weight-semi-bold);
    font-size: 0.85rem;
    position: relative;
    padding: 0.5rem 0;
}

.nav-links a:hover {
    color: var(--accent-color);
}

/* Underline effect on hover */
.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--accent-color);
    transition: var(--transition-smooth);
}

.nav-links a:hover::after {
    width: 100%;
}

/* Hamburger Menu (Mobile) */
.hamburger {
    display: none;
    cursor: pointer;
    flex-direction: column;
    gap: 6px;
}

.hamburger span {
    width: 25px;
    height: 2px;
    background-color: var(--text-primary);
    transition: var(--transition-smooth);
}

/* Main Content Area */
main {
    min-height: calc(100vh - 160px); /* Adjust based on nav/footer height */
    padding: 4rem 5%;
    max-width: 1400px;
    margin: 0 auto;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.8rem 2rem;
    background-color: var(--accent-color);
    color: var(--text-primary);
    font-weight: var(--weight-bold);
    font-size: 0.8rem;
    border: none;
    cursor: pointer;
    transition: var(--transition-smooth);
    letter-spacing: 0.1em;
}

.btn:hover {
    filter: brightness(1.1);
    transform: translateY(-2px);
}

/* Footer Style */
footer {
    border-top: 1px solid var(--footer-border);
    padding: 3rem 5%;
    background-color: var(--bg-color);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    max-width: 1400px;
    margin: 0 auto;
}

.footer-left {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.footer-left span, .footer-left a {
    font-size: 0.75rem;
    font-weight: var(--weight-regular);
    color: var(--text-primary);
    opacity: 0.8;
}

.footer-left a:hover {
    color: var(--accent-color);
    opacity: 1;
}

.footer-right .btn-contact {
    background-color: var(--accent-color);
    padding: 0.7rem 1.8rem;
    font-size: 0.75rem;
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .nav-links {
        display: none; /* Hidden by default on mobile */
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background-color: var(--bg-color);
        flex-direction: column;
        align-items: center;
        padding: 2rem 0;
        border-bottom: 1px solid var(--nav-border);
    }

    .nav-links.active {
        display: flex;
    }

    .hamburger {
        display: flex;
    }

    .footer-content {
        flex-direction: column;
        align-items: flex-start;
        gap: 2rem;
    }
}