body {
    font-family: 'Segoe UI', Arial, sans-serif;
    background: #f4f7fb;
    margin: 0;
    padding: 0;
    min-height: 100vh;
    color: #222;
}
.topbar {
    display: flex;
    align-items: center;
    justify-content: flex-start;
    background: #2563eb;
    color: #fff;
    padding: 0 24px;
    height: 56px;
    box-shadow: 0 2px 8px rgba(37,99,235,0.08);
}
.home-btn {
    color: #fff;
    text-decoration: none;
    font-weight: bold;
    font-size: 1.1rem;
    padding: 8px 16px;
    border-radius: 6px;
    transition: background 0.2s;
    display: flex;
    align-items: center;
}
.home-btn:hover {
    background: rgba(255,255,255,0.12);
}
.spacer {
    flex: 1;
}
.lang-select {
    display: flex;
    align-items: center;
    gap: 8px;
}
.lang-select label {
    color: #fff;
    font-size: 1rem;
}
.lang-select select {
    border-radius: 5px;
    border: none;
    padding: 6px 12px;
    font-size: 1rem;
    background: #fff;
    color: #2563eb;
    font-weight: bold;
}
#app {
    max-width: 420px;
    margin: 48px auto 0 auto;
    background: #fff;
    border-radius: 16px;
    box-shadow: 0 4px 24px rgba(37,99,235,0.10);
    padding: 40px 28px 32px 28px;
    display: flex;
    flex-direction: column;
    align-items: center;
}
h1 {
    color: #2563eb;
    margin-bottom: 32px;
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: -1px;
    text-align: center;
}
.select-group {
    width: 100%;
    margin-bottom: 24px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}
label {
    font-size: 1.05rem;
    font-weight: 500;
    margin-bottom: 2px;
}
select {
    padding: 10px 12px;
    border-radius: 6px;
    border: 1.5px solid #2563eb;
    font-size: 1rem;
    background: #f4f7fb;
    color: #2563eb;
    font-weight: 600;
    outline: none;
    transition: border 0.2s;
}
select:focus {
    border: 2px solid #2563eb;
}
button#recommend-btn {
    width: 100%;
    padding: 14px 0;
    background: #2563eb;
    color: #fff;
    border: none;
    border-radius: 8px;
    font-size: 1.15rem;
    font-weight: bold;
    margin-top: 8px;
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(37,99,235,0.08);
    transition: background 0.2s, box-shadow 0.2s;
}
button#recommend-btn:hover {
    background: #1741a6;
    box-shadow: 0 4px 16px rgba(37,99,235,0.15);
}
#result {
    margin-top: 32px;
    text-align: center;
    font-size: 1.3rem;
    color: #2563eb;
    font-weight: 600;
    min-height: 36px;
    letter-spacing: 2px;
}
.footer {
    margin-top: 48px;
    text-align: center;
    color: #2563eb;
    font-size: 1rem;
    padding: 24px 0 12px 0;
    background: none;
}
@media (max-width: 600px) {
    .topbar {
        padding: 0 4vw;
        height: 48px;
    }
    .home-btn {
        font-size: 1rem;
        padding: 6px 8px;
    }
    .lang-select label {
        font-size: 0.95rem;
    }
    .lang-select select {
        font-size: 0.95rem;
        padding: 4px 8px;
    }
    #app {
        max-width: 98vw;
        padding: 18px 2vw 18px 2vw;
        margin: 24px auto 0 auto;
        border-radius: 10px;
    }
    h1 {
        font-size: 1.15rem;
        margin-bottom: 18px;
    }
    .select-group {
        gap: 4px;
        margin-bottom: 14px;
    }
    label {
        font-size: 0.98rem;
    }
    select {
        font-size: 0.98rem;
        padding: 7px 8px;
    }
    button#recommend-btn {
        font-size: 1rem;
        padding: 10px 0;
        margin-top: 6px;
    }
    #result {
        font-size: 1.05rem;
        margin-top: 18px;
        min-height: 24px;
    }
    .footer {
        font-size: 0.92rem;
        margin-top: 24px;
        padding: 12px 0 8px 0;
    }
}
@media (max-width: 400px) {
    #app {
        padding: 8px 1vw 8px 1vw;
    }
    .topbar {
        padding: 0 2vw;
    }
}