/* ========= Reset & Base ========= */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: Arial, Helvetica, sans-serif;
    line-height: 1.6;
    color: #222;
    background-color: #f8f9fa;
}

/* ========= Header & Navigation ========= */
.topbar {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    background: #2b2b2b;
    color: white;
    padding: 1rem 2rem;
    position: sticky;
    top: 0;
    z-index: 1000;
}

#logo {
    color: white;
    font-size: 1.4rem;
    font-weight: bold;
    text-decoration: none;
}

.nav-links {
    list-style: none;
    display: flex;
    gap: 1.5rem;
}

.nav-links a,
a.nav-link {
    text-decoration: none;
    color: #f1f1f1;
    font-weight: 500;
    transition: color 0.2s ease;
}

.nav-links a:hover,
a.nav-link:hover {
    color: #ffb400;
}

/* ========= Main Content ========= */
main {
    max-width: 1000px;
    margin: 2rem auto;
    padding: 0 1rem;
    min-height: calc(100dvh - 8rem);
}

section {
    scroll-margin-top: 5rem;
}

.card {
    background: white;
    border-radius: 12px;
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
}

.card h1 {
    margin-bottom: 1rem;
    font-size: 1.6rem;
    color: #333;
}

.card h2 {
    margin-bottom: 1rem;
    font-size: 1.6rem;
    color: #333;
}

.card h3 {
    margin-top: 1.5rem;
    margin-bottom: 0.5rem;
    font-size: 1.2rem;
    color: #444;
}

.card p {
    margin-bottom: 1rem;
}

.card ul {
    margin: 0.5rem 0 1rem 1.2rem;
    padding-left: 1rem;
}

.card li {
    margin-bottom: 0.5rem;
}

.referenssikuvat img,
img.referenssikuva {
    width: 100%;
    height: auto;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    margin-top: 1rem;
    padding: 2rem;
}

/* ========= Footer link ========= */
#footerlink-div {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 1000;
}

#footerlink-header {
    display: inline-block;
    padding: 0.6rem 1rem;
    border-radius: 8px;
    background: #2b2b2b;
    color: white;
    transition: background 0.2s ease;
}

#footerlink-header:hover {
    background: #444;
}

body:has(footer:in-view) #footerlink-div {
    opacity: 0;
    display: none;
}

/* ========= Footer ========= */
footer {
    background: #222;
    color: #ddd;
    padding: 2rem;
    text-align: center;
    position: relative;
    bottom: 0;
    z-index: 2000;
}

footer h2 {
    margin-bottom: 1rem;
    color: #fff;
}

footer a {
    color: #ffb400;
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}

/* ========= Responsive ========= */
@media screen and (max-width: 1150px) {
    .topbar {
        flex-direction: column;
        align-items: flex-start;
    }

    .nav-link,
    .nav-links {
        font-size: 0.8rem;
    }

    #logo {
        transform: none;   
        font-size: 1.2rem;
    }

    main {
        padding: 0 0.5rem;
    }

    #footerlink-header {
        padding: 0.3rem 0.5rem;
        border-radius: 8px;
    }

    #footerlink-div h2 {
        font-size: 1.2rem;
    }
}

@media screen and (max-width: 600px) {
    .card {
        padding: 1rem;
    }

    .card h1 {
        font-size: 1.4rem;
    }

    .card h2 {
        font-size: 1.4rem;
    }

    .card h3 {
        font-size: 1.1rem;
    }

    .nav-links {
        display: none;
    }

    #logo {
        font-size: 1rem;
    }

    .referenssikuvat img,
    img.referenssikuva {
        border-radius: 8px;
        box-shadow: 0 2px 6px rgba(0,0,0,0.1);
        margin-top: 0.5rem;
        padding: 1rem;
    }
}