body {
    font-family: Arial, sans-serif;
    background: transparent; 
    margin: 0;
    min-height: 100vh;
    overflow: hidden;
    position: relative;
}


#bg-video {
    position: fixed;
    top: 50%;
    left: 50%;
    width: 100vw;
    height: 56.25vw; 
    min-height: 100vh;
    min-width: 177.77vh; 
    transform: translate(-50%, -50%);
    z-index: 0;
    pointer-events: none;
    opacity: 0;
    transition: opacity 1s ease-in-out;
    border: none;
    outline: none;
}

#bg-video.playing {
    opacity: 1;
}

.bio-container {
    position: relative;
    z-index: 2;
    background: rgba(20, 20, 20, 0.95);
    padding: 32px 44px;
    border-radius: 20px;
    box-shadow: 0 4px 32px rgba(0,0,0,0.25);
    text-align: center;
    max-width: 370px;
    margin: 60px auto;
}

.avatar-border {
    width: 130px;
    height: 130px;
    border-radius: 50%;
    padding: 4px;
    background: conic-gradient(
        #ff0000, #ff9900, #ffee00, #33ff00, #00ffee, #0066ff, #cc00ff, #ff0000
    );
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 18px auto;
    transition: background 0.5s;
    box-shadow: 0 0 24px 4px rgba(255,255,255,0.12);
}

.avatar {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    object-fit: cover;
    background: #222;
    border: 3px solid #222;
    display: block;
}

.username {
    font-size: 2.2rem;
    font-weight: bold;
    margin-bottom: 12px;
    margin-top: 0;
    letter-spacing: 1px;
    background: linear-gradient(90deg, #ff0000, #ff9900, #ffee00, #33ff00, #00ffee, #0066ff, #cc00ff, #ff0000);
    background-size: 200% auto;
    color: transparent;
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    animation: rainbow-text 3s linear infinite;
}

@keyframes rainbow-text {
    0% { background-position: 0% 50%; }
    100% { background-position: 100% 50%; }
}

.caption {
    font-size: 1.1rem;
    color: #fff;
    background: rgba(0,0,0,0.3);
    border-radius: 8px;
    padding: 12px;
    margin-top: 10px;
    display: inline-block;
    font-weight: 500;
    box-shadow: 0 2px 8px rgba(0,0,0,0.12);
}


.social-icons {
    position: absolute;
    bottom: 140px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 35px;
    z-index: 2;
}

.social-icon {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    transition: all 0.3s;
    position: relative;
    backdrop-filter: blur(10px);
    border: 2px solid rgba(255,255,255,0.3);
}

.social-icon i {
    font-size: 28px;
    color: #fff;
    filter: drop-shadow(0 0 8px rgba(255,255,255,0.8));
}

.social-icon.youtube {
    background: rgba(255, 0, 0, 0.4);
    box-shadow: 0 4px 20px rgba(255, 0, 0, 0.5),
                0 0 40px rgba(255, 0, 0, 0.3);
    animation: float 6s ease-in-out infinite;
}

.social-icon.telegram {
    background: rgba(0, 136, 204, 0.4);
    box-shadow: 0 4px 20px rgba(0, 136, 204, 0.5),
                0 0 40px rgba(0, 136, 204, 0.3);
    animation: float 6s ease-in-out infinite 2s;
}

.social-icon.discord {
    background: rgba(88, 101, 242, 0.4);
    box-shadow: 0 4px 20px rgba(88, 101, 242, 0.5),
                0 0 40px rgba(88, 101, 242, 0.3);
    animation: float 6s ease-in-out infinite 4s;
}

.social-icon:hover {
    transform: translateY(-8px) scale(1.15);
    border: 2px solid rgba(255,255,255,0.6);
}

.social-icon.youtube:hover {
    background: rgba(255, 0, 0, 0.7);
    box-shadow: 0 8px 35px rgba(255, 0, 0, 0.7),
                0 0 60px rgba(255, 0, 0, 0.4);
}

.social-icon.telegram:hover {
    background: rgba(0, 136, 204, 0.7);
    box-shadow: 0 8px 35px rgba(0, 136, 204, 0.7),
                0 0 60px rgba(0, 136, 204, 0.4);
}

.social-icon.discord:hover {
    background: rgba(88, 101, 242, 0.7);
    box-shadow: 0 8px 35px rgba(88, 101, 242, 0.7),
                0 0 60px rgba(88, 101, 242, 0.4);
}

@keyframes float {
    0%, 100% {
        transform: translateY(0px) rotate(0deg);
    }
    33% {
        transform: translateY(-25px) rotate(5deg);
    }
    66% {
        transform: translateY(15px) rotate(-5deg);
    }
}


/* --- CSS CHO CÁC NÚT Ở GÓC MÀN HÌNH (Đã cập nhật) --- */
.top-left-buttons {
    position: fixed;
    top: 30px;
    left: 30px;
    z-index: 10;
    display: flex;
    gap: 15px; /* Khoảng cách giữa hai nút */
}

.top-button {
    text-decoration: none;
    display: inline-block;
    padding: 15px 35px;
    background: rgba(255, 255, 255, 0.08);
    backdrop-filter: blur(20px);
    border-radius: 50px;
    border: 2px solid rgba(255, 255, 255, 0.1);
    transition: all 0.3s ease;
    overflow: hidden;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2),
                inset 0 1px 0 rgba(255, 255, 255, 0.2);
}

.tab-text {
    position: relative;
    z-index: 2;
    font-weight: bold;
    font-size: 18px;
    letter-spacing: 2px;
    color: #fff;
    text-shadow: 0 2px 10px rgba(255, 255, 255, 0.5);
}

.top-button:hover {
    transform: translateY(-2px);
}

.top-button.rainbow-border {
    border: 2px solid transparent;
    background-origin: border-box;
    background-clip: padding-box, border-box;
}


.welcome-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0, 0, 0, 0.9);
    backdrop-filter: blur(10px);
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: opacity 0.5s ease;
}

.welcome-overlay.hidden {
    opacity: 0;
    pointer-events: none;
}

.welcome-content {
    text-align: center;
    max-width: 800px;
    padding: 0 20px;
}


.welcome-title {
    font-size: 2.5rem;
    font-weight: bold;
    margin-bottom: 40px;
    line-height: 1.3;
    
    color: #fff;
    
    -webkit-text-stroke: 3px transparent;
    background: linear-gradient(90deg, #ff0000, #ff9900, #ffee00, #33ff00, #00ffee, #0066ff, #cc00ff, #ff0000);
    background-size: 200% 100%;
    background-clip: text;
    -webkit-background-clip: text;
    animation: rainbow-border-text 4s linear infinite;
    
    text-shadow: 
        0 0 10px rgba(255, 0, 0, 0.8),
        0 0 20px rgba(0, 255, 238, 0.6),
        0 0 30px rgba(204, 0, 255, 0.4),
        0 0 40px rgba(255, 238, 0, 0.3);
    
    animation: rainbow-border-text 4s linear infinite, text-glow 3s ease-in-out infinite alternate;
}


@keyframes rainbow-border-text {
    0% { 
        background-position: 0% 50%;
        -webkit-text-stroke: 3px #ff0000;
    }
    14% { 
        -webkit-text-stroke: 3px #ff9900;
    }
    28% { 
        -webkit-text-stroke: 3px #ffee00;
    }
    42% { 
        -webkit-text-stroke: 3px #33ff00;
    }
    57% { 
        -webkit-text-stroke: 3px #00ffee;
    }
    71% { 
        -webkit-text-stroke: 3px #0066ff;
    }
    85% { 
        -webkit-text-stroke: 3px #cc00ff;
    }
    100% { 
        background-position: 200% 50%;
        -webkit-text-stroke: 3px #ff0000;
    }
}


@keyframes text-glow {
    0% {
        text-shadow: 
            0 0 10px rgba(255, 0, 0, 0.8),
            0 0 20px rgba(255, 0, 0, 0.6),
            0 0 30px rgba(255, 0, 0, 0.4),
            0 0 40px rgba(255, 0, 0, 0.3);
        color: rgba(255, 255, 255, 0.9);
    }
    25% {
        text-shadow: 
            0 0 10px rgba(0, 255, 238, 0.8),
            0 0 20px rgba(0, 255, 238, 0.6),
            0 0 30px rgba(0, 255, 238, 0.4),
            0 0 40px rgba(0, 255, 238, 0.3);
        color: rgba(255, 255, 255, 1);
    }
    50% {
        text-shadow: 
            0 0 10px rgba(204, 0, 255, 0.8),
            0 0 20px rgba(204, 0, 255, 0.6),
            0 0 30px rgba(204, 0, 255, 0.4),
            0 0 40px rgba(204, 0, 255, 0.3);
        color: rgba(255, 255, 255, 0.95);
    }
    75% {
        text-shadow: 
            0 0 10px rgba(255, 238, 0, 0.8),
            0 0 20px rgba(255, 238, 0, 0.6),
            0 0 30px rgba(255, 238, 0, 0.4),
            0 0 40px rgba(255, 238, 0, 0.3);
        color: rgba(255, 255, 255, 1);
    }
    100% {
        text-shadow: 
            0 0 10px rgba(51, 255, 0, 0.8),
            0 0 20px rgba(51, 255, 0, 0.6),
            0 0 30px rgba(51, 255, 0, 0.4),
            0 0 40px rgba(51, 255, 0, 0.3);
        color: rgba(255, 255, 255, 0.9);
    }
}

.enter-btn {
    background: linear-gradient(135deg, rgba(255,255,255,0.1), rgba(255,255,255,0.05));
    border: 2px solid rgba(255,255,255,0.3);
    color: white;
    padding: 18px 50px;
    font-size: 1.3rem;
    font-weight: bold;
    letter-spacing: 3px;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 15px;
    backdrop-filter: blur(10px);
    box-shadow: 0 8px 32px rgba(0,0,0,0.2);
}

.enter-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 40px rgba(255,255,255,0.2);
    background: linear-gradient(135deg, rgba(255,255,255,0.2), rgba(255,255,255,0.1));
    border-color: rgba(255,255,255,0.5);
}

.enter-btn i {
    transition: transform 0.3s ease;
}

.enter-btn:hover i {
    transform: translateX(5px);
}


.loading-spinner {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 60px;
    height: 60px;
    border: 4px solid rgba(255, 255, 255, 0.2);
    border-top: 4px solid #fff;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    z-index: 101;
    display: none;
}

@keyframes spin {
    0% { transform: translate(-50%, -50%) rotate(0deg); }
    100% { transform: translate(-50%, -50%) rotate(360deg); }
}


@media (max-width: 768px) {
    #bg-video {
        height: 100vh;
        width: 177.77vh;
    }
    
    .bio-container {
        margin: 30px 20px;
        padding: 24px 32px;
        max-width: 320px;
    }
    
    .top-left-buttons {
        top: 15px;
        left: 15px;
        gap: 10px;
    }
    
    .top-button {
        padding: 12px 25px;
    }

    .tab-text {
        font-size: 16px;
        letter-spacing: 1px;
    }
    
    .social-icons {
        bottom: 100px;
        gap: 25px;
    }
    
    .social-icon {
        width: 50px;
        height: 50px;
    }
    
    .social-icon i {
        font-size: 24px;
    }
    
    .welcome-title {
        font-size: 1.8rem;
        -webkit-text-stroke: 2px transparent;
    }
    
    .enter-btn {
        padding: 15px 40px;
        font-size: 1.1rem;
        letter-spacing: 2px;
    }
}
/* Thêm vào cuối file style.css */

/* --- USER INFO Ở GÓC PHẢI --- */
.top-right-user {
    position: fixed;
    top: 30px;
    right: 30px;
    z-index: 10;
}

/* Login button khi chưa đăng nhập */
.login-button i {
    margin-right: 5px;
}

/* User info khi đã đăng nhập */
.user-info {
    display: flex;
    align-items: center;
    gap: 12px;
    background: rgba(255, 255, 255, 0.08);
    backdrop-filter: blur(20px);
    border: 2px solid rgba(255, 255, 255, 0.1);
    border-radius: 50px;
    padding: 8px 15px 8px 8px;
    transition: all 0.3s ease;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
}

.user-info:hover {
    background: rgba(255, 255, 255, 0.12);
    border-color: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

.user-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    overflow: hidden;
    border: 2px solid rgba(0, 255, 136, 0.5);
    flex-shrink: 0;
}

.user-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.user-details {
    flex: 1;
    min-width: 0;
}

.user-name {
    font-size: 0.95rem;
    font-weight: 600;
    color: #fff;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 120px;
}

.user-status {
    display: flex;
    align-items: center;
    gap: 4px;
    font-size: 0.75rem;
    color: rgba(255, 255, 255, 0.7);
    margin-top: 2px;
}

.user-status .online {
    color: #00ff88;
    font-size: 0.6rem;
}

.user-menu {
    position: relative;
}

.menu-button {
    background: none;
    border: none;
    color: rgba(255, 255, 255, 0.7);
    cursor: pointer;
    padding: 5px;
    border-radius: 50%;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.menu-button:hover {
    background: rgba(255, 255, 255, 0.1);
    color: #00ff88;
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: 8px;
    background: rgba(20, 20, 20, 0.95);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    min-width: 180px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s ease;
    z-index: 1001;
}

.dropdown-menu.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 15px;
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    border: none;
    background: none;
    width: 100%;
    font-size: 0.9rem;
    transition: all 0.3s ease;
    cursor: pointer;
}

.dropdown-item:hover {
    background: rgba(0, 255, 136, 0.1);
    color: #00ff88;
}

.dropdown-item i {
    width: 16px;
    text-align: center;
}

.dropdown-divider {
    height: 1px;
    background: rgba(255, 255, 255, 0.1);
    margin: 5px 0;
}

.logout-btn:hover {
    background: rgba(255, 71, 87, 0.1) !important;
    color: #ff4757 !important;
}

/* Responsive cho user info */
@media (max-width: 768px) {
    .top-right-user {
        top: 15px;
        right: 15px;
    }
    
    .user-name {
        max-width: 80px;
    }
    
    .user-info {
        padding: 6px 12px 6px 6px;
    }
    
    .user-avatar {
        width: 35px;
        height: 35px;
    }
    
    .dropdown-menu {
        min-width: 160px;
    }
}

@media (max-width: 480px) {
    .user-details {
        display: none;
    }
    
    .user-info {
        padding: 6px;
    }
}