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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: #f5f7fa;
    color: #333;
    line-height: 1.6;
    padding: 20px;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

header {
    margin-bottom: 30px;
    padding: 20px;
    background: #2c3e50;
    color: white;
    border-radius: 8px;
}

.header-top {
    display: flex;
    align-items: center;
    gap: 20px;
    margin-bottom: 20px;
}

.logo {
    height: 60px;
    width: auto;
}

header h1 {
    font-size: 2.5rem;
    margin: 0;
}

.controls {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
    align-items: center;
}

.search-box,
.filter-box {
    flex: 1;
    min-width: 200px;
}

#searchInput {
width: 100%;
padding: 12px;
font-size: 16px;
border: 2px solid #3498db;
border-radius: 6px;
outline: none;
transition: border-color 0.3s;
}

#searchInput:focus {
border-color: #2980b9;
}

#folderFilter,
#dateFilter {
width: 100%;
padding: 12px;
font-size: 16px;
border: 2px solid #3498db;
border-radius: 6px;
outline: none;
transition: border-color 0.3s;
}

#folderFilter:focus,
#dateFilter:focus {
border-color: #2980b9;
}

main {
    max-width: 900px;
    margin: 0 auto;
    flex: 1;
    width: 100%;
}

#mailList {
list-style: none;
}

.mail-item {
    background: white;
    border-left: 4px solid #3498db;
    padding: 20px;
    margin: 15px 0;
    border-radius: 6px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    transition: transform 0.2s;
}

.mail-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.15);
}

.mail-header {
    margin-bottom: 10px;
}

.mail-header a {
    color: #2c3e50;
    text-decoration: none;
    font-size: 1.3rem;
}

.mail-header a:hover {
    color: #3498db;
    text-decoration: underline;
}

.mail-meta {
    font-size: 0.9rem;
    color: #6c757d;
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
}

.mail-meta span {
    display: flex;
    gap: 5px;
}

.no-results {
    text-align: center;
    padding: 40px;
    color: #6c757d;
    font-size: 1.2rem;
}

footer {
    margin-top: 40px;
    padding: 20px;
    text-align: left;
    color: #6c757d;
    font-size: 0.9rem;
    border-top: 1px solid #ddd;
}

#copyright {
margin: 0;
}

@media (max-width: 768px) {
    body {
        padding: 10px;
    }

    .header-top {
        flex-direction: column;
        align-items: flex-start;
    }

    header h1 {
        font-size: 2rem;
    }

    .logo {
        height: 50px;
    }

    .mail-item {
        padding: 15px;
    }

    .mail-meta {
        flex-direction: column;
        gap: 8px;
    }
}