:root {
    --primary: #4caf50;
    --background: #f5f7fa;
    --surface: #fff;
    --text: #222;
    --tab-active: #e8f5e9;
    --tab-inactive: #f5f7fa;
    --border: #e0e0e0;
}
@media (prefers-color-scheme: dark) {
    :root {
        --primary: #81c784;
        --background: #181a1b;
        --surface: #23272a;
        --text: #f5f7fa;
        --tab-active: #263238;
        --tab-inactive: #181a1b;
        --border: #333;
    }
}
html, body {
    width: 100vw;
    min-width: 0;
    height: 100vh;
    min-height: 0;
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body {
    width: 100vw;
    min-width: 0;
    height: 100vh;
    min-height: 0;
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
.container {
    max-width: none;
    width: 100vw;
    min-width: 0;
    min-height: 0;
    margin: 0;
    border-radius: 0;
    box-shadow: none;
    padding: 0;
    background: var(--surface);
    display: flex;
    flex-direction: column;
    height: 100vh;
}
@media (max-width: 1000px) {
    .container {
        padding: 18px 4vw 18px 4vw;
    }
}
@media (max-width: 600px) {
    .container {
        padding: 8px 2vw 8px 2vw;
    }
}
.title {
    font-size: 2.2rem;
    font-weight: 600;
    letter-spacing: 0.02em;
    margin-bottom: 24px;
    text-align: center;
    color: var(--primary);
}
.tabs {
    display: flex;
    justify-content: space-between;
    background: var(--tab-inactive);
    border-radius: 0;
    overflow: hidden;
    margin-bottom: 0;
    border: 1px solid var(--border);
}
.tab {
    flex: 1;
    padding: 14px 0;
    text-align: center;
    font-size: 1.08rem;
    font-weight: 500;
    color: var(--text);
    background: var(--tab-inactive);
    border: none;
    outline: none;
    cursor: pointer;
    transition: background 0.2s, color 0.2s;
}
.tab.active {
    background: var(--tab-active);
    color: var(--primary);
    font-weight: 600;
}
#main-content {
    flex: 1 1 auto;
    min-height: 0;
    padding: 24px 32px 32px 32px;
    box-sizing: border-box;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
}
#main-app-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
    width: 100vw;
    box-sizing: border-box;
}
#track-layout {
    display: flex;
    width: 100%;
    height: 100%;
    min-height: 0;
}
#chat-main {
    margin-right: 24px;
    flex: 1 1 0;
    min-width: 0;
    height: 100%;
    display: flex;
    flex-direction: column;
    width: 50%;
}
#sidebar {
    width: 22vw;
    min-width: 220px;
    max-width: 340px;
    background: var(--surface);
    border-left: 1px solid var(--border);
    padding: 18px 12px 12px 18px;
    display: flex;
    flex-direction: column;
    gap: 24px;
    box-sizing: border-box;
    height: 100%;
}
@media (max-width: 900px) {
    #sidebar {
        min-width: 140px;
        padding: 10px 4px 8px 8px;
    }
}
@media (max-width: 700px) {
    #main-app-container {
        flex-direction: column;
    }
    #track-layout {
        flex-direction: column;
    }
    #sidebar {
        width: 100vw;
        max-width: none;
        min-width: 0;
        border-left: none;
        border-top: 1px solid var(--border);
        padding: 12px 8px 8px 8px;
        height: auto;
        min-height: 0;
    }
}