body {
    font-family: Arial, sans-serif;
    background: #020202;
    color: #f8fafc;
    margin: 0;
}

.container {
    max-width: 900px;
    margin: auto;
    padding: 20px;
}

h1, h3 {
    text-align: center;
}

h1 {
    color: #ef4444;
}

.subtitle {
    text-align: center;
    color: #fca5a5;
}

.notification {
    background: linear-gradient(135deg, #7f1d1d, #1f2933);
    padding: 12px;
    border-radius: 10px;
    text-align: center;
    margin: 20px 0;
}

.playlist, .add-song, .player {
    background: linear-gradient(160deg, #020617, #1f2937);
    padding: 18px;
    border-radius: 16px;
    margin-top: 24px;
    border: 1px solid #7f1d1d;
}

ul {
    list-style: none;
    padding: 0;
}

li {
    padding: 10px;
    border-bottom: 1px solid #7f1d1d;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

input {
    width: 100%;
    padding: 10px;
    margin-top: 8px;
    border-radius: 8px;
    border: none;
    background: #020617;
    color: #f8fafc;
}

button {
    background: #dc2626;
    color: #fff;
    border: none;
    padding: 8px 14px;
    border-radius: 8px;
    cursor: pointer;
    margin-top: 10px;
}

button:hover {
    background: #b91c1c;
}

footer {
    text-align: center;
    margin-top: 32px;
    color: #fca5a5;
}

.add-song input {
    background: linear-gradient(180deg, #020617, #020617);
    border: 1px solid #7f1d1d;
}

/* FIX INPUT BỊ TRÀN – GIỮ NGUYÊN DESIGN */
.add-song input {
    width: 100%;
    box-sizing: border-box;
}

#playQueueBtn {
    display: block;
    margin: 10px auto 0;
}

/* Thêm style cho auth */
li > div {
    display: flex;
    gap: 8px;
}

#authSection {
    text-align: center;
    margin: 20px 0;
}

#googleSignInBtn, #signOutBtn {
    background: #dc2626;
    color: #fff;
    border: none;
    padding: 10px 20px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 16px;
}

#googleSignInBtn:hover, #signOutBtn:hover {
    background: #b91c1c;
}

#userInfo {
    color: #fca5a5;
    font-size: 18px;
}