/* ===== BASE ===== */
body{
    margin:0;
    font-family:system-ui, -apple-system, Arial, sans-serif;
    background:#f5f7fb;
    color:#1f2937;
    line-height:1.7;
}

/* ===== HEADER TITLE ===== */
h1{
    margin:0;
    padding:18px;
    background:linear-gradient(90deg, #2563eb, #06b6d4);
    color:white;
    text-align:center;
    font-size:22px;
    font-weight:800;
    letter-spacing:0.3px;
}

/* ===== CONTENT WRAPPER ===== */
#content{
    max-width:920px;
    margin:0 auto;
    padding:18px;
}

/* ===== CARD ===== */
.card{
    background:white;
    padding:16px;
    border-radius:14px;
    margin-bottom:14px;
    border:1px solid #e5e7eb;
    box-shadow:0 2px 10px rgba(0,0,0,0.04);
}

/* ===== LOADING ===== */
.loading{
    opacity:0.6;
}

/* ===== NAVIGATION ===== */
.top-menu{
    display:flex;
    justify-content:center;
    flex-wrap:wrap;
    gap:8px;
    padding:10px;
    margin:12px auto;
    max-width:920px;
    background:white;
    border:1px solid #e5e7eb;
    border-radius:12px;
}

/* menu link */
.top-menu a{
    color:#374151;
    text-decoration:none;
    padding:8px 12px;
    font-size:14px;
    font-weight:600;
    border-radius:8px;
    transition:0.2s ease;
}

/* hover */
.top-menu a:hover{
    background:#eff6ff;
    color:#2563eb;
}

/* active */
.top-menu a.active{
    background:#2563eb;
    color:white;
}

/* ===== MOBILE ===== */
@media (max-width:600px){
    h1{
        font-size:18px;
        padding:14px;
    }

    .top-menu{
        gap:6px;
        padding:8px;
    }

    .top-menu a{
        font-size:13px;
        padding:7px 10px;
    }
}

/* ===== FOOTER ===== */
.site-footer{
    background:#ffffff;
    margin-top:40px;
    padding:35px 15px;
    border-top:1px solid #e5e7eb;
}

.footer-container{
    max-width:920px;
    margin:auto;
    display:grid;
    grid-template-columns:repeat(3, 1fr);
    gap:20px;
}

/* footer title */
.site-footer h2,
.site-footer h3{
    color:#2563eb;
    margin-bottom:10px;
    font-size:15px;
}

/* footer text */
.site-footer p{
    font-size:14px;
    color:#4b5563;
    line-height:1.7;
}

/* ===== FOOTER LINKS ===== */
.site-footer a{
    display:block;
    color:#374151;
    text-decoration:none;
    margin:6px 0;
    font-size:14px;
    padding:6px 8px;
    border-radius:6px;
    transition:0.2s ease;
}

.site-footer a:hover{
    background:#f3f4f6;
    color:#2563eb;
    transform:translateX(3px);
}

.site-footer a:active{
    transform:scale(0.98);
}

/* ===== MOBILE FOOTER ===== */
@media(max-width:768px){
    .footer-container{
        grid-template-columns:1fr;
        text-align:center;
    }

    .site-footer a{
        display:inline-block;
        width:100%;
    }
}