:root {
    --text-dark: #333;
    --text-light: #555;
    --bg-light: #ffffff;
    --footer-bg: #B4A6A6;
    --footer-bottom-bg: #453D3D;
    --nav-active-color: #B4A6A6;
    --font-primary: 'Poppins', sans-serif;
}

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

html,
body {
    overflow-x: hidden;
}

body {
    font-family: var(--font-primary);
    color: var(--text-dark);
    background-color: var(--bg-light);
}

.container {
    width: 90%;
    max-width: 1100px;
    margin: 0 auto;
}

header {
    background-color: var(--bg-light);
    padding: 20px 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.05);
}

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

.logo a {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--text-dark);
    text-decoration: none;
}

.desktop-nav ul {
    list-style: none;
    display: flex;
    gap: 40px;
}

.desktop-nav a {
    text-decoration: none;
    color: var(--text-dark);
    font-size: 1rem;
    font-weight: 500;
}

.desktop-nav a.current {
    color: var(--nav-active-color);
}

footer {
    color: var(--text-dark);
}

.footer-main {
    background-color: var(--footer-bg);
    padding: 50px 0;
    display: flex;
    justify-content: space-around;
    align-items: flex-start;
    flex-wrap: wrap;
    gap: 30px;
}

.footer-column {
    flex: 1;
    min-width: 250px;
    padding: 0 20px;
}

.footer-column h4 {
    font-size: 1.1rem;
    margin-bottom: 20px;
    font-weight: 600;
}

.footer-column p {
    margin-bottom: 10px;
    display: flex;
    justify-content: space-between;
}

.footer-column.social-column a {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 15px;
    text-decoration: none;
    color: var(--text-dark);
    margin-bottom: 15px;
    text-align: right;
}

.footer-column.social-column i {
    font-size: 1.5rem;
    color: var(--text-dark);
    border: 2px solid var(--text-dark);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: inline-flex;
    justify-content: center;
    align-items: center;
    flex-shrink: 0;
}

.footer-bottom {
    background-color: var(--footer-bottom-bg);
    color: #fff;
    text-align: center;
    padding: 15px 0;
    font-size: 0.9rem;
}

.portfolio-main {
    padding: 80px 0;
    min-height: 90vh;
}

.portfolio-main h1 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 60px;
}

.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
}

.achievement-box {
    position: relative;
    overflow: hidden;
    height: 400px;
    border-radius: 20px;
    cursor: pointer;
    background-size: cover;
    background-position: center;
    transition: transform 0.3s ease;
}

.achievement-box.pitch {
    background-image: url('assets/pitch-background.png');
}

.achievement-box.stall {
    background-image: url('assets/event-background.jpg');
}

.achievement-box.patent {
    background-image: url('assets/patent-background.jpg');
}

.achievement-box::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border-radius: 20px;
    z-index: 1;
}

.achievement-box:hover {
    transform: translateY(-5px);
}

.details-panel {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 100%;
    padding: 20px;
    z-index: 2;
    background: linear-gradient(to top, #B4A6A6, #7a707435);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    transform: translateY(100%);
    will-change: transform;
    transition: transform 0.6s cubic-bezier(0.25, 1, 0.5, 1);
}

.details-panel h2 {
    color: #000;
    font-size: 2.2rem;
    font-weight: 600;
    margin-bottom: 15px;
}

.details-panel p {
    color: #000;
    font-size: 1rem;
    font-weight: 400;
    max-width: 80%;
}

.achievement-box:hover .details-panel,
.achievement-box.active .details-panel {
    transform: translateY(0);
}

.mobile-logo,
.hamburger-menu,
.mobile-nav {
    display: none;
}

@media (max-width: 900px) {
    .portfolio-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {

    .desktop-nav,
    .logo {
        display: none;
    }

    .mobile-logo,
    .hamburger-menu {
        display: flex;
    }

    .mobile-logo-icon {
        width: 40px;
        height: 40px;
        display: flex;
    }

    .hamburger-menu {
        flex-direction: column;
        justify-content: space-around;
        width: 30px;
        height: 25px;
        background: transparent;
        border: none;
        cursor: pointer;
        padding: 0;
        z-index: 10;
    }

    .hamburger-menu .bar {
        width: 30px;
        height: 3px;
        background-color: var(--text-dark);
        border-radius: 5px;
    }

    .mobile-nav {
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background-color: var(--bg-light);
        box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    }

    .mobile-nav.active {
        display: block;
    }

    .mobile-nav ul {
        list-style: none;
        flex-direction: column;
        width: 100%;
    }

    .mobile-nav li {
        text-align: center;
        border-bottom: 1px solid #eee;
    }

    .mobile-nav a {
        display: block;
        padding: 20px;
        text-decoration: none;
        color: var(--text-dark);
        font-weight: 500;
    }

    .mobile-nav a.current {
        background-color: #f7f7f7;
        color: var(--text-dark);
    }

    .footer-main {
        flex-direction: column;
        align-items: flex-start;
        text-align: left;
    }

    .footer-column {
        width: 100%;
        max-width: none;
    }

    .footer-column.social-column {
        flex-direction: column;
        align-items: flex-start;
    }

    .footer-column.social-column a {
        flex-direction: row;
        gap: 0px;
        align-items: center;
        justify-content: space-between;
        width: 100%;
        text-align: left;
    }
}