* {
    padding: 0;
    margin: 0;
    box-sizing: border-box;
    --main-color: #136e9e;
    --op1-color: #365c74;
    --op2-color: #121212;
    --op3-color: #818181;
    --op4-color: #c3c9cd;
    --op5-color: #fff;
    --op6-color: #0b4f70;
}
body {
    font-family: system-ui, sans-serif;
    line-height: 1.5;
    background: var(--op5-color);
    color: var(--op2-color);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}
header {
    text-align: center;
    padding: 1rem;
}
header img {
    max-width: 180px;
    height: auto;
}
main {
    flex: 1;
    padding: 1rem;
    display: grid;
    gap: 1.5rem;
}
section h2 {
    font-size: 1.2rem;
    margin-bottom: 0.8rem;
    display: flex;
    align-items: center;
}
section h2 span {
    color: var(--main-color);
    margin-right: 0.5rem;
}
aside {
    border-top: 1px solid var(--op4-color);
    padding-top: 1rem;
}
.proj-title {
    font-weight: bold;
    margin-bottom: 0.5rem;
    background-color: var(--main-color);
    color: var(--op5-color);
    padding: 0.6rem 0.6rem;
}
.project {
    display: block;
    color: var(--main-color);
    text-decoration: none;
    margin-bottom: 0.5rem;
    transition: color 0.2s;
}
.project:hover {
    color: var(--op6-color);
}
footer {
    position: fixed;
    bottom: 1rem;
    right: 1rem;
}
.whatsapp-float {
    display: flex;
    align-items: center;
    background: #25d366;
    color: #fff;
    padding: 0.6rem 1rem;
    border-radius: 50px;
    text-decoration: none;
    box-shadow: 0 4px 6px rgba(0,0,0,0.2);
    font-size: 0.9rem;
    transition: transform 0.2s;
}
.whatsapp-float:hover {
    transform: scale(1.05);
}
.whatsapp-icon {
    width: 24px;
    height: 24px;
    margin-right: 0.5rem;
}

/* Responsivo */
@media (min-width: 768px) {
    body {
        max-width: 1500px;
        margin: 0 auto;
    }
    header {
        text-align:start;
    }
    header img {
        max-width:100%;
        height: auto;
    }
    main {
        grid-template-columns: 2fr 1fr;
    }
    section h2 {
        font-size: 2rem;
        width: 80%;
    }
    .proj-title {
        font-size: 1.5rem;
    }
}