* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #0a0a0a 0%, #1a1a2e 50%, #16213e 100%);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
    position: relative;
    overflow: hidden;
}

body::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 50%, rgba(255, 215, 0, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(255, 165, 0, 0.1) 0%, transparent 50%);
    pointer-events: none;
}

.container {
    width: 100%;
    max-width: 480px;
    position: relative;
    z-index: 1;
}

.login-box {
    background: linear-gradient(135deg, rgba(26, 26, 46, 0.95) 0%, rgba(15, 15, 30, 0.95) 100%);
    border-radius: 25px;
    padding: 50px 40px;
    box-shadow: 0 25px 70px rgba(0, 0, 0, 0.6), 0 0 0 2px rgba(255, 215, 0, 0.2);
    border: 2px solid rgba(255, 215, 0, 0.3);
    animation: slideUp 0.6s ease;
    backdrop-filter: blur(10px);
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(40px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.login-box h1 {
    text-align: center;
    background: linear-gradient(135deg, #FFD700 0%, #FFA500 50%, #FF6347 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 40px;
    font-size: 42px;
    font-weight: 900;
    letter-spacing: 3px;
    text-shadow: 0 0 40px rgba(255, 215, 0, 0.5);
    text-transform: uppercase;
}

.tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 35px;
    border-bottom: 2px solid rgba(255, 215, 0, 0.3);
    padding-bottom: 0;
}

.tab-btn {
    flex: 1;
    padding: 14px;
    border: none;
    background: transparent;
    cursor: pointer;
    font-size: 16px;
    font-weight: 700;
    color: rgba(255, 255, 255, 0.5);
    transition: all 0.3s;
    border-bottom: 3px solid transparent;
    margin-bottom: -2px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.tab-btn.active {
    color: #FFD700;
    border-bottom-color: #FFD700;
}

.tab-btn:hover {
    color: #FFD700;
}

.form-group {
    margin-bottom: 25px;
}

.form-group label {
    display: block;
    margin-bottom: 10px;
    color: rgba(255, 255, 255, 0.9);
    font-weight: 600;
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.form-group input {
    width: 100%;
    padding: 16px 20px;
    border: 2px solid rgba(255, 215, 0, 0.3);
    border-radius: 12px;
    font-size: 16px;
    transition: all 0.3s;
    outline: none;
    background: rgba(255, 255, 255, 0.05);
    color: #fff;
}

.form-group input:focus {
    border-color: #FFD700;
    box-shadow: 0 0 0 4px rgba(255, 215, 0, 0.15);
    background: rgba(255, 255, 255, 0.08);
}

.form-group input::placeholder {
    color: rgba(255, 255, 255, 0.4);
}

.btn {
    width: 100%;
    padding: 16px;
    border: none;
    border-radius: 12px;
    font-size: 18px;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s;
    margin-top: 15px;
    text-transform: uppercase;
    letter-spacing: 2px;
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
}

.btn-primary {
    background: linear-gradient(135deg, #FFD700 0%, #FFA500 100%);
    color: #1a1a2e;
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 30px rgba(255, 215, 0, 0.5);
    background: linear-gradient(135deg, #FFA500 0%, #FFD700 100%);
}

.btn-primary:active {
    transform: translateY(-1px);
}

.alert {
    padding: 14px 18px;
    border-radius: 12px;
    margin-bottom: 25px;
    font-size: 14px;
    font-weight: 600;
    border: 2px solid;
    animation: slideDown 0.3s;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.alert-error {
    background: rgba(255, 107, 107, 0.2);
    color: #ff6b6b;
    border-color: rgba(255, 107, 107, 0.5);
}

.alert-success {
    background: rgba(78, 205, 196, 0.2);
    color: #4ecdc4;
    border-color: rgba(78, 205, 196, 0.5);
}

@media (max-width: 480px) {
    .login-box {
        padding: 40px 25px;
        border-radius: 20px;
    }
    
    .login-box h1 {
        font-size: 32px;
        letter-spacing: 2px;
        margin-bottom: 30px;
    }
    
    .form-group input {
        padding: 14px 18px;
        font-size: 15px;
    }
    
    .btn {
        padding: 14px;
        font-size: 16px;
    }
}