::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: #0f0f0f; }
::-webkit-scrollbar-thumb { background: #333333; border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: #555555; }

* { 
    box-sizing: border-box; 
    margin: 0; 
    padding: 0; 
    font-family: monospace, sans-serif; 
    touch-action: manipulation; 
}

body { background-color: #0b0b0b; color: #e0e0e0; line-height: 1.5; padding: 15px; }

header { text-align: center; margin-bottom: 20px; border: 1px solid #333; padding: 15px; background: #121212; }
h1 { font-size: 1.3rem; color: #fff; text-transform: uppercase; letter-spacing: 2px; }

#login-container { max-width: 400px; width: 100%; margin: 80px auto; border: 1px solid #444; padding: 25px; background: #141414; box-shadow: 0 4px 15px rgba(0,0,0,0.5); }
#login-container h2 { margin-bottom: 20px; font-size: 1.2rem; text-align: center; color: #fff; }
.form-group { margin-bottom: 15px; }
.form-group label { display: block; margin-bottom: 6px; font-size: 0.85rem; color: #aaa; }
.form-group input { width: 100%; padding: 12px; background: #000; border: 1px solid #444; color: #fff; outline: none; font-size: 1rem; }
.form-group input:focus { border-color: #888; }

.checkbox-group { display: flex; align-items: center; gap: 8px; margin-bottom: 15px; font-size: 0.85rem; color: #aaa; cursor: pointer; }
.checkbox-group input { width: 16px; height: 16px; cursor: pointer; }

button { width: 100%; padding: 12px; background: #fff; color: #000; border: none; font-weight: bold; cursor: pointer; text-transform: uppercase; font-size: 0.9rem; }
button:hover { background: #ccc; }
.error-msg { color: #ff5555; font-size: 0.85rem; margin-top: 10px; text-align: center; }

#main-app { display: none; width: 100%; max-width: 1400px; margin: 0 auto; }

.tabs-container {
    display: flex;
    overflow-x: auto;
    gap: 8px;
    margin-bottom: 15px;
    border: 1px solid #333;
    padding: 10px;
    background: #111;
    white-space: nowrap;
    -webkit-overflow-scrolling: touch;
}
.tab-btn {
    background: #1a1a1a;
    color: #aaa;
    border: 1px solid #333;
    padding: 8px 14px;
    cursor: pointer;
    font-size: 0.8rem;
    flex-shrink: 0;
    width: auto;
}
.tab-btn:hover, .tab-btn.active {
    background: #333;
    color: #fff;
    border-color: #fff;
}

.toolbar {
    margin-bottom: 15px;
    display: flex;
    gap: 10px;
}
.toolbar button {
    width: auto;
    padding: 8px 15px;
    background: #1a1a1a;
    color: #fff;
    border: 1px solid #444;
    font-size: 0.8rem;
}
.toolbar button:hover {
    background: #333;
    border-color: #fff;
}

/* Bố cục lưới tương thích tối ưu trên cả PC và Mobile khi ẩn/hiện danh sách */
.layout-grid { 
    display: grid; 
    grid-template-columns: 350px 1fr; 
    gap: 20px; 
    transition: all 0.3s ease; 
}
.layout-grid.hide-playlist { 
    grid-template-columns: 1fr; 
}
.layout-grid.hide-playlist #playlist-wrapper { 
    display: none; 
}

@media (max-width: 900px) { 
    .layout-grid { 
        display: flex;
        flex-direction: column;
        gap: 15px;
    } 
    .layout-grid.hide-playlist #playlist-wrapper { 
        display: none; 
    }
    body { padding: 8px; }
}

#playlist { border: 1px solid #333; height: 450px; overflow-y: auto; background: #111; padding: 10px; }
.playlist-item { padding: 12px; border: 1px solid #222; margin-bottom: 8px; cursor: pointer; font-size: 0.85rem; word-break: break-all; background: #161616; transition: background 0.2s; }
.playlist-item:hover { border-color: #666; background: #222; }
.playlist-item.active { border-color: #fff; background: #2a2a2a; font-weight: bold; }

#player-container { border: 1px solid #333; padding: 15px; background: #111; display: flex; flex-direction: column; align-items: center; justify-content: center; width: 100%; }
video, img { width: 100%; max-height: 420px; object-fit: contain; background: #000; border: 1px solid #333; outline: none; }

.control-panel { display: flex; gap: 10px; margin-top: 15px; width: 100%; flex-wrap: wrap; justify-content: center; }
.control-panel button { width: auto; flex: 1; min-width: 100px; padding: 10px; background: #222; color: #fff; border: 1px solid #444; font-size: 0.8rem; }
.control-panel button:hover { background: #444; border-color: #fff; }

#current-title { margin-top: 10px; font-size: 0.85rem; color: #aaa; word-break: break-all; text-align: center; }