* { box-sizing: border-box; }

html,
body {
    height: 100%;
    margin: 0;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

body {
    display: flex;
    background: #f6f7f9;
    color: #1f2933;
}

#sidebar {
    width: 330px;
    min-width: 260px;
    max-width: 45vw;
    height: 100vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    padding: 14px;
    border-right: 1px solid #d7dde5;
    background: #fff;
}

h1 {
    margin: 0 0 12px;
    font-size: 1.25rem;
}

#search {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid #b9c2cf;
    border-radius: 8px;
    font-size: 1rem;
}

#area-filter,
#letter-filter {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
}

#area-filter {
    margin-top: 10px;
    margin-bottom: 8px;
}

#letter-filter {
    margin-bottom: 10px;
}

.area-btn,
.letter-btn {
    border: 1px solid #d7dde5;
    background: #f9fafb;
    border-radius: 6px;
    cursor: pointer;
    padding: 4px 8px;
    font-size: 0.85rem;
}

.area-btn:hover,
.letter-btn:hover {
    background: #eef2f7;
}

.area-btn.active {
    background: #005bbb;
    color: white;
    border-color: #005bbb;
}

.letter-btn.active {
    background: #d9480f;
    color: white;
    border-color: #d9480f;
}

#status {
    margin: 10px 0;
    color: #52606d;
    font-size: .9rem;
}

#streetList {
    overflow: auto;
    padding-right: 4px;
}

.street-button {
    display: block;
    width: 100%;
    margin: 0 0 6px;
    padding: 9px 10px;
    text-align: left;
    border: 1px solid #d7dde5;
    border-radius: 8px;
    background: #f9fafb;
    cursor: pointer;
    font-size: .95rem;
}

.street-button:hover {
    background: #eef2f7;
}

.street-button.active {
    border-color: #cc3d00;
    background: #fff3ed;
    font-weight: 700;
}

#map {
    flex: 1;
    height: 100vh;
}

@media (max-width: 760px) {
    body {
        flex-direction: column;
    }

    #sidebar {
        width: 100%;
        max-width: none;
        height: 42vh;
        border-right: 0;
        border-bottom: 1px solid #d7dde5;
    }

    #map {
        height: 58vh;
    }
}